JP2009275735A - Solenoid valve - Google Patents

Abstract

An object of the present invention is to suppress adverse effects caused by a member moving at high speed inside a solenoid valve.
In a normally closed solenoid valve 100D, a sleeve 120 is formed with a fluid chamber for containing a working fluid. The first mover 216 is disposed in the liquid chamber so as to separate the liquid chamber into the first divided chamber V1 and the second divided chamber V2, and has a flow path 216e communicating with the first divided chamber V1 and the second divided chamber V2. A flow path P1 is formed. The first armature 216 moves in the second direction against the urging force of the ball 226 by an electromagnetic force applied when a current is supplied to the coil 130, and the second end 212b of the rod 212 is moved to the valve seat 114b. It can be separated from The ball 226 makes contact with the first movable element 216 so as to close the flow path 216e when the first movable element 216 moves in the second direction, thereby increasing the flow resistance of the hydraulic fluid through the flow path.
[Selection] Figure 17

Description

  The present invention relates to an electromagnetic valve, and more particularly, to an electromagnetic valve provided with a liquid chamber that contains hydraulic fluid.

2. Description of the Related Art In recent years, electronically controlled brake systems have been actively developed to improve running stability and vehicle safety by electronically controlling braking force applied to each of a plurality of wheels mounted on a vehicle. Linear solenoid valves are widely used in electronically controlled brake systems for increasing and decreasing wheel cylinder pressure. As such a linear solenoid valve, for example, a normally closed solenoid valve that prevents communication of the hydraulic fluid path by pressing the rod against the seat by spring force and seating the rod on the seat has been proposed (for example, Patent Document 1). Or refer to Patent Document 2).
JP 2005-30562 A JP 2006-17181 A

  In the electromagnetic valve described in the above patent document, for example, when the supply of current to the coil is stopped from the opened state, the valve element is seated on the valve seat by the spring force. At this time, if the valve seats on the valve seat at a high speed, problems such as abnormal noise may occur between them.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to suppress an adverse effect caused by a member moving at a high speed inside the electromagnetic valve.

  In order to solve the above-described problems, an electromagnetic valve according to an aspect of the present invention is disposed in a liquid chamber so as to separate a liquid chamber into two separation chambers, a storage member in which a liquid chamber for storing hydraulic fluid is formed, And a flow resistance changing means for increasing the flow resistance of the working fluid through the flow path when the mover moves in the liquid chamber.

  According to this aspect, the moving speed of the mover can be suppressed by increasing the flow resistance of the hydraulic fluid. For this reason, generation | occurrence | production of the abnormal noise etc. which generate | occur | produce, for example when a needle | mover moves at high speed and contact | abuts to a to-be-contacted part can be suppressed.

  The flow resistance changing means may include a contact member that increases the flow resistance of the working fluid through the flow path by contacting the mover so as to block a part of the flow path when the mover moves in the liquid chamber. Good. According to this aspect, the contact speed of the mover to the contacted portion can be suppressed with a simple configuration of blocking a part of the flow path.

  A valve seat interposed in the hydraulic fluid path, a first direction toward the valve seat, and a second direction away from the valve seat are provided to be movable, and by sitting on the valve seat, communication of the hydraulic fluid path is prevented and from the valve seat And a valve element that causes the hydraulic fluid path to communicate with each other by being separated from each other. The movable element is provided so as to move in the second direction when the valve element moves away from the valve seat, and the contact member moves the movable element so as to block a part of the flow path when the movable element moves in the second direction. You may contact.

  As described above, when the valve element is separated from the valve seat, the movable element may move in the second direction and contact the contacted portion. According to this aspect, the contact speed of the mover to the contacted part in such a case can be suppressed.

  An urging means for applying an urging force toward the valve element in the first direction so that the valve element is seated on the valve seat, and a coil wound around the movable element may be further provided. The mover may be provided to move in the second direction against an urging force of the urging means by an electromagnetic force applied when a current is supplied to the coil.

  When such a mover is moved by electromagnetic force, an adsorbing force may be generated between the two when approaching the contacted part, and the mover may contact the contacted part at high speed. There is a possibility that abnormal noise is more likely to occur. According to this aspect, it is possible to reduce the contact speed of the mover to the contacted part in such a case.

  The biasing means applies a biasing force in the first direction to the movable element, and when the current is not supplied to the coil, the movable element moves in the first direction together with the valve by the biasing force of the biasing means. The child may be seated on the valve seat, and when current is supplied to the coil, it may be separated from the valve member by moving in the second direction against the biasing force of the biasing means by the applied electromagnetic force. According to this aspect, when the movable element is separated from the valve element, it is possible to control the opening and closing of the electromagnetic valve regardless of the urging force of the urging means. For this reason, the self-excited vibration which generate | occur | produces inside a solenoid valve can be suppressed.

  A valve seat interposed in the hydraulic fluid path, a first direction toward the valve seat, and a second direction away from the valve seat are provided to be movable, and by sitting on the valve seat, communication of the hydraulic fluid path is prevented and from the valve seat And a valve element that causes the hydraulic fluid path to communicate with each other by being separated from each other. The mover is provided so as to move in the first direction together with the valve element so that the valve element is seated on the valve seat, and the contact member is a part of the flow path when the mover moves in the liquid chamber in the first direction. You may contact | abut to a needle | mover so that it may block. According to this aspect, the seating speed of the valve element when seated on the valve seat can be reduced. For this reason, the abnormal noise etc. which generate | occur | produce between a valve | bulb and a valve seat can be suppressed.

  There may be further provided urging means for applying a urging force in the first direction to the valve element so that the valve element is seated on the valve seat. The movable element may be provided so as to move in the first direction together with the valve element by the urging force of the urging means to seat the valve element on the valve seat.

  When the rod is seated on the valve seat by the urging force of the urging means, it is generally difficult to control the seating speed of the valve seat when seated on the valve seat. According to this aspect, the seating speed of the valve can be relaxed in such a case.

  You may further provide the coil wound around the needle | mover. The biasing means applies a biasing force in the first direction to the movable element, and when the current is not supplied to the coil, the movable element moves in the first direction together with the valve by the biasing force of the biasing means. The child may be seated on the valve seat, and when current is supplied to the coil, it may be separated from the valve member by moving in the second direction against the biasing force of the biasing means by the applied electromagnetic force. According to this aspect, when the movable element is separated from the valve element, it is possible to control the opening and closing of the electromagnetic valve regardless of the urging force of the urging means. For this reason, the self-excited vibration which generate | occur | produces inside a solenoid valve can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the bad effect which arises when a member moves at high speed inside a solenoid valve can be suppressed.

  Hereinafter, embodiments of the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a system diagram of a brake control device 10 according to the first embodiment. The brake control device 10 employs an electronically controlled brake system (ECB), and independently and optimally sets the four-wheel brakes of the vehicle according to the operation of the brake pedal 12 as a brake operation member by the driver.

  The brake pedal 12 is connected to a master cylinder 14 that sends out brake oil as hydraulic fluid in response to a depression operation by the driver. The brake pedal 12 is provided with a stroke sensor 46 that detects the depression stroke. Further, a reservoir tank 26 is connected to the master cylinder 14, and a reaction force corresponding to the operating force of the brake pedal 12 by the driver is created at one output port of the master cylinder 14 via the electromagnetic valve 23. A stroke simulator 24 is connected. The solenoid valve 23 is a so-called normally-closed linear valve, which is closed when no current is supplied, and is supplied with current when the driver depresses the brake pedal 12 and is opened.

  A brake hydraulic pressure control pipe 16 for the right front wheel is connected to one output port of the master cylinder 14. The brake hydraulic pressure control pipe 16 is connected to a right front wheel wheel cylinder 20FR that applies a braking force to the right front wheel. A brake hydraulic pressure control pipe 18 for the left front wheel is connected to the other output port of the master cylinder 14. The brake hydraulic control pipe 18 is connected to a left front wheel wheel cylinder 20FL that applies a braking force to the left front wheel.

  A right master valve 22FR is provided in the middle of the brake hydraulic pressure control pipe 16, and a left master valve 22FL is provided in the middle of the brake hydraulic pressure control pipe 18. The right master valve 22FR and the left master valve 22FL are both so-called normally-open linear valves, which are closed in a state where current is supplied, and the master cylinder 14 and the right front wheel wheel cylinder 20FR or the left front wheel wheel are closed. The communication with the cylinder 20FL is blocked, and the valve is opened by reducing or stopping the supply of current, so that the master cylinder 14 communicates with the wheel cylinder 20FR for the right front wheel or the wheel cylinder 20FL for the left front wheel. Hereinafter, the right master valve 22FR and the left master valve 22FL are collectively referred to as a master valve 22 as necessary.

  A right master pressure sensor 48FR for detecting the master cylinder pressure on the right front wheel side is provided in the middle of the brake hydraulic pressure control pipe 16. A left master pressure sensor 48FL that detects the master cylinder pressure on the left front wheel side is provided in the middle of the brake hydraulic pressure control pipe 18 for the left front wheel. In the brake control apparatus 10, when the brake pedal 12 is depressed by the driver, the stroke operation amount is detected by the stroke sensor 46, but the master cylinder pressure detected by the right master pressure sensor 48FR and the left master pressure sensor 48FL. Therefore, the depression force (depression force) of the brake pedal 12 can be obtained. The electronic control unit (hereinafter referred to as “ECU”) 200 monitors the master cylinder pressure from the detection results of the right master pressure sensor 48FR and the left master pressure sensor 48FL from the viewpoint of fail-safe in consideration of the failure of the stroke sensor 46 and the like. To do.

  One end of a hydraulic supply / discharge pipe 28 is connected to the reservoir tank 26. A suction port of a pump 34 driven by a motor 32 is connected to the other end of the hydraulic supply / discharge pipe 28. The discharge port of the pump 34 is connected to a high pressure pipe 30, and an accumulator 50 and a relief valve 53 are connected to the high pressure pipe 30. In the first embodiment, a reciprocating pump including two or more pistons (not shown) that are reciprocated by a motor 32 is employed as the pump 34. Further, as the accumulator 50, an accumulator that converts the pressure energy of the brake oil into the pressure energy of an enclosed gas such as nitrogen is stored.

  The accumulator 50 stores brake oil whose pressure has been increased to, for example, about 14 to 22 MPa by the pump 34. Further, the valve outlet of the relief valve 53 is connected to the hydraulic supply / discharge pipe 28. When the pressure of the brake oil in the accumulator 50 increases abnormally to about 25 MPa, for example, the relief valve 53 is opened and the high-pressure brake is opened. The oil is returned to the hydraulic supply / discharge pipe 28. Further, the high-pressure pipe 30 is provided with an accumulator pressure sensor 51 that detects the outlet pressure of the accumulator 50, that is, the pressure of the brake oil in the accumulator 50.

  The high pressure pipe 30 includes a right front wheel pressure increasing valve 40FR, a left front wheel pressure increasing valve 40FL, a right rear wheel pressure increasing valve 40RR, and a left rear wheel pressure increasing valve 40RL (hereinafter collectively referred to as “pressure increasing valve” as necessary. 40 ”), the right front wheel wheel cylinder 20FL, the left front wheel wheel cylinder 20FL, the right rear wheel wheel cylinder 20RR, and the left rear wheel wheel cylinder 20RL (hereinafter collectively referred to as necessary). (Referred to as “wheel cylinder 20”). Each of the pressure increasing valves 40 is a so-called normally closed linear valve (solenoid valve), which is closed when no current is supplied to open the wheel cylinder pressure without increasing the wheel cylinder pressure. Then, increase the wheel cylinder pressure.

  The right front wheel wheel cylinder 20FR to the right rear wheel wheel cylinder 20RR are respectively a right front wheel pressure reducing valve 42FR, a left front wheel pressure reducing valve 42FL, a right rear wheel pressure reducing valve 42RR, and a left rear wheel pressure reducing valve 42RL (hereinafter, These are collectively referred to as “reducing valve 42” as necessary.

  The right front wheel pressure reducing valve 42FR and the left front wheel pressure reducing valve 42FL are so-called normally-closed linear valves (solenoid valves). When the current is not supplied, the valve is closed and the wheel cylinder pressure is not reduced. When supplied, the valve opens to reduce the wheel cylinder pressure. On the other hand, the left rear wheel pressure reducing valve 42RL and the right rear wheel pressure reducing valve 42RR are so-called normally open linear valves (solenoid valves), which are closed when the current is supplied to reduce the wheel cylinder pressure. First, when the current supply is reduced or stopped, the valve is opened to reduce the wheel cylinder pressure.

  The right front wheel wheel cylinder 20FR, the left front wheel wheel cylinder 20FL, the right rear wheel wheel cylinder 20RR, and the hydraulic piping in the vicinity of the left rear wheel wheel cylinder 20RL respectively detect the hydraulic pressure of the corresponding wheel cylinder 20 respectively. Front wheel wheel cylinder pressure sensor 44FR, left front wheel wheel cylinder pressure sensor 44FL, right rear wheel wheel cylinder pressure sensor 44RR, and left rear wheel wheel cylinder pressure sensor 44RL (hereinafter collectively referred to as " A wheel cylinder pressure sensor 44 ") is provided.

  The above-described master valve 22, pressure increasing valve 40, pressure reducing valve 42, pump 34, accumulator 50, master pressure sensor 48, wheel cylinder pressure sensor 44, accumulator pressure sensor 51 and the like constitute a hydraulic actuator 80. The operation of the hydraulic actuator 80 is controlled by the ECU 200.

  FIG. 2 is a cross-sectional view showing in detail the configuration of a normally closed electromagnetic valve 100A mounted on the brake control device 10 according to the first embodiment. The normally closed solenoid valve 100A is employed for the right front wheel pressure reducing valve 42FR and the left front wheel pressure reducing valve 42FL. Note that the normally closed solenoid valve 100A may be employed as another normally closed solenoid valve. The normally closed solenoid valve 100A includes a guide 110, a rod 112, a seat 114, a first mover 116, a second mover 118, a sleeve 120, a first spring 122, a second spring 124, a coil yoke 126, a ring yoke 128, and A coil 130 is included.

  The guide 110 is a magnetic body formed in a columnar shape, and a sheet fitting hole 110a is formed in one direction side from the substantially center in the axial direction, and a rod sliding hole 110c is coaxial with the central axis of the guide 110 in the other direction side. Moreover, they are provided so as to penetrate each other. An insertion hole 110d having a slightly larger inner diameter than the rod sliding hole 110c is provided at the end of the rod sliding hole 110c that is open to the outside. Further, the guide 110 is provided with a working fluid passage 110b that penetrates in a radial direction from the inner wall to the outer surface of the sheet insertion hole 110a. The hydraulic fluid passage 110 b communicates with the hydraulic supply / discharge pipe 28 and guides the hydraulic fluid discharged from the hydraulic fluid passage 114 a to the reservoir tank 26 via the hydraulic supply / discharge pipe 28.

  The sheet 114 is a nonmagnetic material formed in a columnar shape. The sheet 114 may be a magnetic material. A bottomed spring accommodating hole 114 c that is coaxial with the central axis is provided on one end side of the sheet 114. On the other end side of the sheet 114, a hydraulic fluid path 114a that is also coaxial with the central axis is also provided. The hydraulic fluid passage 114a is narrowed at one end from the end where the spring accommodation hole 114c is not provided and penetrates through the spring accommodation hole 114c. A valve seat 114b is formed at the boundary between the bottom of the spring accommodating hole 114c and the narrowed hydraulic fluid passage 114a. The inner diameter of the sheet insertion hole 110a is substantially the same as the outer diameter of the sheet 114, and the sheet 114 is inserted into the rod sliding hole 110c from the end where the spring accommodation hole 114c is provided, and comes out of the guide 110. It is fitted firmly so that there is no.

  In the vicinity of the first end 112a of the rod 112, a first thin shaft portion 112c having an outer diameter smaller than that of the central portion is provided, and a circular portion is provided at a boundary portion between the central portion of the rod 112 and the first thin shaft portion 112c. An annular first locking portion 112d is formed. The rod 112 is made of a nonmagnetic material. In the vicinity of the second end 112b of the rod 112, a second thin shaft portion 112e having an outer diameter smaller than that of the central portion is provided, and a circular portion is provided at the boundary portion between the central portion of the rod 112 and the second thin shaft portion 112e. An annular rod second locking portion 112f is formed.

  The rod 112 is inserted into the rod sliding hole 110c of the guide 110 so as to be slidable in the axial direction so that the second end portion 112b faces the valve seat 114b of the seat 114. Hereinafter, the axial direction in which the rod 112 faces the valve seat 114b of the seat 114 is referred to as a first direction, and the axial direction in which the rod 112 is separated from the valve seat 114b of the seat 114 is referred to as a second direction. The second spring 124 is disposed between the bottom of the spring accommodating hole 114c and the second locking portion 112f of the rod 112 in a compressed state, and applies a biasing force to the rod 112 so as to press in the second direction. Note that the second spring 124 may be omitted and the normally closed electromagnetic valve 100A may be opened by the hydraulic pressure in the hydraulic fluid path 114a of the seat 114.

  The 2nd needle | mover 118 is a magnetic body formed in the column shape, and is penetrated and provided in the axial direction so that the insertion hole 118c may become coaxial with a central axis. A first shaft portion 118a having an outer diameter smaller than that of the central portion is provided near one end portion of the second movable element 118, and an outer diameter smaller than that of the central portion is provided near the other end portion. A biaxial portion 118b is provided. The insertion hole 118 c has an inner diameter that is slightly larger than the outer diameter of the first thin shaft portion 112 c of the rod 112. The second mover 118 is fixed to the rod 112 by being fitted into the first thin shaft portion 112c of the rod 112 so that the end on the second shaft portion 118b side becomes the first direction side. As a result, the second mover 118 is movable together with the rod 112 in the axial direction.

  In a state where the second end portion 112b of the rod 112 is seated on the valve seat 114b of the seat 114, the first locking portion 112d of the rod 112 is positioned on the first direction side with respect to the second direction side end portion of the guide 110. However, it is located in the 2nd direction side rather than the bottom of insertion hole 110d of guide 110. The second armature 118 has the first thin shaft portion 112c of the rod 112 fitted into the insertion hole 118c, and the end on the second shaft portion 118b side contacts the first locking portion 112d of the rod 112. It is locked. For this reason, the second shaft portion 118 b is accommodated in the insertion hole 110 d of the guide 110. At this time, the second mover 118 is locked to the guide 110 with a small interval and does not contact the guide 110. Hereinafter, the interval between the surfaces perpendicular to the axial direction in which the second movable element 118 and the guide 110 face each other is referred to as a second gap g2.

  The first mover 116 is a magnetic body formed in a columnar shape. A bottomed accommodation hole 116 a is provided coaxially with the central axis at one end of the first mover 116. A spring accommodating hole 116b is provided coaxially with the central axis at the other end of the first mover 116. The first mover 116 is disposed coaxially with the rod 112 on the second direction side of the second mover 118. At this time, the 1st needle | mover 116 is arrange | positioned so that the accommodation hole 116a may become the 1st direction side. The first thin shaft portion 112 c of the rod 112 is longer in the axial direction than the second mover 118. For this reason, the 1st needle | mover 116 is contact | abutted and latched to the 1st end part 112a of the rod 112. FIG. The accommodating hole 116a of the first movable element 116 has an inner diameter larger than the outer diameter of the first shaft portion 118a of the second movable element 118, and the second movable element 118 is accommodated in the accommodating hole 116a. In this way, the first movable element 116 and the second movable element 118 are respectively formed with overlapping portions L1 that are adjacent to each other in the radial direction.

  The sleeve 120 has a shape in which a guide portion 120b, which is a non-magnetic body formed in a thin cylindrical shape, is integrally coupled to a main body portion 120a, which is a magnetic body formed in a columnar shape, so as to be coaxial. It is formed. The first movable element 116 and the second movable element 118 are inserted into the guide part 120 b of the sleeve 120, and the end part of the guide 110 in the second direction is fitted into the distal end part of the guide part 120 b, so that the sleeve 120 becomes the guide 110. Fixed. The guide part 120b has an inner diameter that is slightly larger than the outer diameter of the second mover 118. The second mover 118 is guided by the inner peripheral surface of the guide part 120b and is movable in the axial direction. 120b. Hereinafter, the interval between the surfaces perpendicular to the axial direction in which the first movable element 116 and the sleeve 120 face each other is referred to as a first gap g1.

  A bottomed spring housing hole 120c is provided at the end of the sleeve 120 on the side where the guide portion 120b is provided. In the compressed state, the first spring 122 abuts on the bottom of the spring accommodating hole 120 c of the sleeve 120 and the other end abuts on the bottom of the spring accommodating hole 116 b of the first movable element 116, thereby A biasing force is applied to the child 116 in the first direction.

  Note that the spring constants of the first spring 122 and the second spring 124 are set so that the biasing force of the first spring 122 is stronger than the biasing force of the second spring 124. Therefore, in a normal state, the rod 112 is pushed in the first direction by the urging force of the first spring 122, and the second end 112b abuts on the valve seat 114b, so that the hydraulic fluid passage 114a and the hydraulic fluid passage 110b The closed state is prevented from communicating.

  The coil 130 is wound so as to surround the outside of the first mover 116 and the second mover 118. The coil yoke 126 is a magnetic body formed in a cylindrical shape. The ring yoke 128 is a disk-shaped magnetic body, and is fixed to the guide 110 by fitting a central insertion hole into the outer periphery of the guide 110. The coil yoke 126 is disposed outside the coil 130 in the radial direction so that the coil yoke 126 surrounds the coil 130, and is attached to the main body 120 a of the sleeve 120 and the ring yoke 128. Thus, the outer periphery of the coil 130 is covered with the coil yoke 126 and the ring yoke 128 which are magnetic materials.

  FIG. 3 is a diagram illustrating a magnetic flux path of the normally closed electromagnetic valve 100A according to the first embodiment. FIG. 3 is a cross-sectional view of the normally closed solenoid valve 100A as in FIG. 2, but the hatched display is omitted to show the path of the magnetic flux.

  In the normally closed electromagnetic valve 100A, the main body 120a of the sleeve 120, the first movable element 116, the second movable element 118, the guide 110, the ring yoke 128, and the coil yoke 126 are magnetic bodies. Therefore, the magnetic flux that has passed through the sleeve 120 first proceeds to the first mover 116 in the axial direction. As the magnetic flux advances in the axial direction in this way, a strong attractive force can be generated between the sleeve 120 and the first movable element 116, and the first movable element 116 can be smoothly moved in the second direction. it can. For this reason, the urging | biasing force to the rod 112 by the 1st spring 122 can be cancelled | released easily. Here, the “attraction force” in the first embodiment refers to a force given by electromagnetic force or magnetic force.

  Next, the magnetic flux travels from the first mover 116 to the second mover 118. At this time, since the first movable element 116 and the second movable element 118 have overlapping portions L1 that are adjacent to each other in the radial direction, the magnetic flux proceeds in the radial direction instead of the axial direction. As the magnetic flux advances in the radial direction in this way, the attractive force generated between the first movable element 116 and the second movable element 118 can be suppressed, and the first movable element 116 and the second movable element 118 are connected. It can be moved smoothly.

  Next, the magnetic flux travels from the second mover 118 to the guide 110. At this time, the magnetic flux that has passed through the second mover 118 advances in the axial direction toward the guide 110. On the other hand, as described above, the guide 110 is provided with the insertion hole 110d, and the second shaft 118b of the second movable element 118 is accommodated in the insertion hole 110d. As a result, in the second movable element 118 and the guide 110, the surfaces perpendicular to each other in the axial direction are appropriately reduced, and the suction force generated between the second movable element 118 and the guide 110 becomes an appropriate magnitude. Has been. The magnetic flux that has traveled to the guide 110 passes through the ring yoke 128 and the coil yoke 126 and travels again to the sleeve 120.

  FIG. 4 shows an example of the change over time of the current supplied to the coil 130 from STEP1 to STEP4 of the normally closed electromagnetic valve 100A, the position of the first mover 116, the position of the second mover 118, and the normally closed electromagnetic at each time point. It is a figure which shows the valve opening of the valve 100A, and a valve closing state. FIGS. 5A to 5D are diagrams showing the state of the normally closed electromagnetic valve 100A in STEP1 to STEP4. Hereinafter, the operation of the normally closed electromagnetic valve 100A will be described in detail with reference to both FIG. 4 and FIG.

  As shown in FIG. 4, no current is supplied to the coil 130 in STEP1. Therefore, no electromagnetic force is applied to the first movable element 116 and the second movable element 118, and the first movable element 116 is urged by the urging force of the first spring 122 as shown in FIG. By pushing the first end portion 112a of the rod 112 in the first direction at the bottom of the accommodation hole 116a, the second end portion 112b of the rod 112 is seated on the valve seat 114b. As a result, communication from the hydraulic fluid path 114a to the hydraulic fluid path 110b is blocked, and the normally closed electromagnetic valve 100A is in a closed state. The position of the first mover 116 at this time is referred to as a first mover set position gset.

  In STEP2, the ECU 200 supplies the coil 130 with a current that causes the first mover 116 to move in the second direction until the first gap g1 becomes zero. The current at this time is defined as a first mover on current Ion, and the position of the first mover 116 at this time is defined as a first mover on position gon. As a result, the urging force by the first spring 122 applied to the rod 112 is released. The current supplied to the coil 130 can also be regarded as a magnetomotive force NI. At this time, the second mover 118 is given an electromagnetic force in the first direction, and pushes the rod 112 in the first direction to bring the second end 112b of the rod 112 into contact with the valve seat 114b. As a result, as shown in FIG. 5B, the normally closed electromagnetic valve 100A is kept closed. The position of the second mover 118 at this time is the second mover lowest position gmin.

  In STEP 3, the ECU 200 reduces the current supplied to the coil 130 until the normally closed electromagnetic valve 100A is opened. A current when the normally closed electromagnetic valve 100A is opened is defined as a valve opening current Iop. When the valve opening current Iop is supplied to the coil 130, the first mover 116 remains in the first mover on position gon due to the attractive force between the first mover 116 and the sleeve 120. On the other hand, the 2nd needle | mover 118 will be in the state which the electromagnetic force to a 1st direction and the reaction force by the hydraulic fluid pressure of the 2nd spring 124 and the hydraulic fluid path 114a balance. As a result, as shown in FIG. 5C, the second end 112b of the rod 112 is separated from the valve seat 114b, and the outflow of the working fluid into the working fluid passage 110b starts.

  When the current supplied to the coil 130 further decreases, the first end 112a of the rod 112 slides in the second direction until it contacts the bottom of the accommodation hole 116a of the first mover 116, and the normally closed solenoid valve 100A Open the valve to the maximum. The position of the second mover 118 at this time is defined as a second mover uppermost position gmax. When the current supplied to the coil 130 is smaller than the valve opening current Iop and larger than the valve closing current Ioff, the second mover 118 is located between the second mover lowest position gmin and the second mover highest position gmax. Moving. Specifically, the second mover 118 approaches the second mover uppermost position gmax as the current supplied to the coil 130 decreases, and the second mover lowermost position gmin as the current supplied to the coil 130 increases. Get closer to. The ECU 200 adjusts the degree of opening of the normally closed electromagnetic valve 100A according to the current supplied to the coil 130 in this way. Further, when the normally closed electromagnetic valve 100A that has been opened is closed again, the ECU 200 increases the current supplied to the coil 130 and moves the second mover 118 to the second mover lowest position gmin.

  In STEP 4, the ECU 200 does not close the normally closed electromagnetic valve 100A by increasing the current supplied to the coil 130, but closes the normally closed electromagnetic valve 100A by reducing the current supplied to the coil 130. . The current when the normally closed electromagnetic valve 100A is closed in this way is defined as a valve closing current Ioff. When the valve closing current Ioff is supplied to the coil 130, the first is the sum of the electromagnetic force applied to the first mover 116, the urging force by the second spring 124, and the reaction force due to the hydraulic pressure in the hydraulic fluid path 114a. The force in one direction is balanced with the force in the second direction, which is the sum of the urging force by the first spring 122 and the electromagnetic force by the second mover 118. Therefore, when a current smaller than the valve closing current Ioff is supplied to the coil 130, the second end 112b of the rod 112 abuts on the valve seat 114b as shown in FIG. 100A closes again.

  FIG. 6 is a diagram showing the relationship between the first gap g1 and the suction force between the first movable element 116 and the sleeve 120. As shown in FIG. As shown in FIG. 6, as the first mover 116 moves from the first mover set position gset to the first mover on position gon, the suction force between the first mover 116 and the sleeve 120 suddenly increases. To rise.

  FIG. 7 is a diagram showing the relationship between the second gap g2 and the attractive force between the second movable element 118 and the guide 110. As shown in FIG. As described above, when the current supplied to the coil 130 is zero or the first mover on-current Ion, the second mover 118 is positioned at the second mover lowest position gmin. As shown in FIG. 7, as the second mover 118 moves from the second mover lowest position gmin to the second mover highest position gmax, the suction force between the second mover 118 and the guide 110 is increased. Decrease gradually.

  FIG. 8 is a diagram showing a relationship between the suction force that the first movable element 116 tries to move in the second direction and the suction force that the second movable element 118 tries to move in the first direction in STEP1 to STEP4. is there. In FIG. 8, the vertical axis means that the force to move in the first direction is strong as it goes up from the origin, and the force to move in the second direction is strong as it goes down.

  In FIG. 8, an arrow V1 described in a region above the origin indicates a change in the suction force of the first mover 116, and an arrow V2 described in a region below the origin indicates a change in the suction force of the second mover 118. Show. The characteristic f1 indicates the relationship between the current supplied to the coil 130 and the attractive force applied to the first mover 116 when the first gap g1 is zero. The characteristic f2 indicates that the first gap g1 The relationship between the current supplied to the coil 130 and the attractive force applied to the first mover 116 at the time of the 1 mover set position gset is shown. Furthermore, the characteristic f3 indicates the relationship between the current supplied to the coil 130 and the attractive force applied to the second mover 118 when the second gap g2 is at the second mover lowermost position gmin, and the characteristic f4 is The relationship between the current supplied to the coil 130 and the attractive force applied to the second mover 118 when the second gap g2 is the second mover uppermost position gmax is shown. F1 indicates the biasing force of the first spring 122 when the first mover 116 is at the first mover set position gset, and F2 is the first mover 116 at the first mover on position gon. The urging force of the first spring 122 is shown.

  When the current supplied from STEP 1 to the coil 130 is gradually increased and the attractive force applied to the first mover 116 reaches F1, the first mover 116 is moved from the first mover set position gset to the first mover on position. A little moving towards gon. Then, the first gap g1 is reduced, and the suction force between the first movable element 116 and the sleeve 120 is rapidly increased. The degree of this increase is greater than the degree of the urging force that is generated when the first spring 122 is compressed by reducing the first gap g1. For this reason, when the attractive force applied to the first mover 116 reaches F1, the first mover 116 moves to the first mover on position gon without applying any more current to the coil 130. On the other hand, in the second mover 118, the relationship between the current supplied to the coil 130 and the attractive force applied to the second mover 118 until the current supplied to the coil 130 reaches the first mover on-current Ion is It changes linearly along f3. Thus, the state of STEP2 is obtained.

  From STEP2 to STEP3 and STEP4, the relationship between the current supplied to the coil 130 and the attractive force applied to the first movable element 116 changes linearly along the characteristic f1. On the other hand, the relationship between the current supplied to the coil 130 and the attractive force applied to the second mover 118 indicates the attractive force when the first mover on-current Ion is supplied. Changes linearly toward the point when the valve closing current Ioff is supplied.

  FIG. 9A is a diagram showing an example of a wheel cylinder pressure that changes over time, and FIG. 9B shows the normally closed electromagnetic valve 100A according to the first embodiment as shown in FIG. 9A. It is a figure which shows the electric current supplied to the coil 130, when changing a wheel cylinder pressure. In order to facilitate understanding, the time on the horizontal axis in FIGS. 9A and 9B is shown at the same timing. Hereinafter, description will be made in relation to both FIG. 9A and FIG. 9B.

  The ECU 200 supplies the coil 130 with the current of the first mover on-current Ion to close the normally closed electromagnetic valve 100A in the state of STEP2. At this time, when the pressure increasing valve 40 is opened and hydraulic fluid is supplied to the wheel cylinder 20, the wheel cylinder pressure increases. When the pressure increasing valve 40 is closed, the wheel cylinder pressure is maintained. Next, the ECU 200 reduces the current supplied to the coil 130 to the valve opening current Iop, and opens the normally closed electromagnetic valve 100A in the state of STEP3. Further, when the current supplied to the coil 130 is gradually decreased, the wheel cylinder pressure gradually decreases.

  Here, when the current supplied to the coil 130 is increased, the normally closed electromagnetic valve 100A is again in the state of STEP2 and is closed, and the wheel cylinder pressure is maintained. At this time, the wheel cylinder pressure has already dropped, and the reaction force that pushes back the rod 112 due to the wheel cylinder pressure has weakened. Therefore, the value obtained by increasing the current supplied to the coil 130 is lower than the valve opening current Iop. The normally closed electromagnetic valve 100A can be closed.

  When the wheel cylinder pressure is reduced again, the normally closed solenoid valve 100A is opened again. At this time, since the wheel cylinder pressure has already decreased, the current supplied to the coil 130 is changed to the value immediately before the valve closing. It needs to be reduced to the value. When the normally closed electromagnetic valve 100A is thus opened, the wheel cylinder pressure can be gradually decreased again.

(Second Embodiment)
FIG. 10 is a cross-sectional view showing in detail the configuration of a normally closed electromagnetic valve 100B mounted on the brake control device 10 according to the second embodiment. In addition, the same code | symbol is attached | subjected about the location similar to 100 A of normally closed solenoid valves which concern on 1st Embodiment, and description is abbreviate | omitted. Unless otherwise specified, the operation procedure of the normally closed solenoid valve 100B is the same as the procedure of the normally closed solenoid valve 100A.

  In the normally closed electromagnetic valve 100B, a first mover 136 is provided instead of the first mover 116, and a second mover 138 is provided instead of the second mover 118. Both the first mover 136 and the second mover 138 are magnetic bodies. The first mover 136 is slightly shorter than the first mover 116, and is formed in the same shape as the first mover 116 except that the accommodation hole 116a is not provided. Therefore, the spring accommodation hole 136 a is the same as the spring accommodation hole 116 b of the first movable element 116. Further, the second movable element 138 is formed in a shape in which the first shaft portion 118a of the second movable element 118 is not cut off by a cross section perpendicular to the axial direction. Therefore, the shaft portion 138a of the second mover 138 is the same as the second shaft portion 118b of the second mover 118, and the insertion hole 138b of the second mover 138 is the same as the insertion hole 118c of the second mover 118. is there.

  The sleeve 120 according to the second embodiment is different from the first embodiment in that the portion of the guide portion 120b connected to the main body portion 120a is a non-magnetic material, and the first mover 136 and the second moveable portion are connected. A central portion that overlaps the child 138 in the radial direction is a magnetic material, and a tip portion is a non-magnetic material.

  FIG. 11 is a diagram illustrating a magnetic flux path of the normally closed electromagnetic valve 100B according to the second embodiment. FIG. 11 is a cross-sectional view of the normally closed electromagnetic valve 100B as in FIG. 10, but the hatched display is omitted to show the path of the magnetic flux.

  In the normally closed solenoid valve 100B, the main body 120a of the sleeve 120, the first mover 136, the central portion of the guide 120b of the sleeve 120, the second mover 138, the guide 110, the ring yoke 128, and the coil yoke 126 are magnetic. is there. For this reason, the magnetic flux that has passed through the sleeve 120 first proceeds to the first mover 136 in the axial direction. Next, the magnetic flux travels from the first armature 136 to the central portion of the guide portion 120b of the sleeve 120. Thus, the 1st needle | mover 136 and the guide part 120b adjoin and mutually overlap in radial direction, and magnetic flux advances to radial direction instead of an axial direction. Therefore, the guide part 120b functions as a magnetic flux transmission member that is a magnetic body and overlaps the first movable element 136 and the second movable element 138 in the radial direction and adjacent to each other. As the magnetic flux advances in the radial direction in this way, the attractive force generated between the first mover 136 and the second mover 138 can be suppressed, and the first mover 136 and the second mover 138 can be connected to each other. It can be moved smoothly.

  In the first embodiment, the magnetic flux advances in a portion where the inner peripheral surface of the accommodation hole 116a of the first mover 116 and the outer peripheral surface of the first shaft portion 118a of the second mover 118 overlap. In the second embodiment, the area of the portion where the outer peripheral surface of the first movable element 136 where the magnetic flux proceeds in the second embodiment and the inner peripheral surface of the guide portion 120b of the sleeve 120 overlap is larger. For this reason, generation | occurrence | production of magnetic saturation can be suppressed and the 1st needle | mover 136 and the 2nd needle | mover 138 can be operated smoothly.

  Next, the magnetic flux proceeds from the central portion of the guide portion 120 b of the sleeve 120 to the second mover 138. Also at this time, the second mover 138 and the guide portion 120b overlap each other in the radial direction, so that the magnetic flux advances in the radial direction instead of the axial direction. Since the magnetic flux advances in the radial direction in this way, the attractive force generated between the first mover 136 and the second mover 138 can be suppressed, and the magnetic flux can be advanced over a wide area. Saturation can be suppressed. The course of the magnetic flux beyond the second mover 138 is the same as in the first embodiment.

(Third embodiment)
FIG. 12 is a cross-sectional view showing in detail the configuration of a normally closed electromagnetic valve 100C mounted on the brake control device 10 according to the third embodiment. In addition, the same code | symbol is attached | subjected about the location similar to 100 A of normally closed solenoid valves which concern on 1st Embodiment, and description is abbreviate | omitted. Unless otherwise specified, the operation procedure of the normally closed solenoid valve 100C is the same as the procedure of the normally closed solenoid valve 100A. In the sleeve 120 according to the third embodiment, as in the second embodiment, the portion of the guide portion 120b that is connected to the main body portion 120a is a non-magnetic material. A central portion that is adjacent to and overlaps the mover 118 in the radial direction is a magnetic material, and a tip portion is a non-magnetic material.

  FIG. 13 is a diagram illustrating a magnetic flux path of the normally closed electromagnetic valve 100C according to the third embodiment. FIG. 13 is a cross-sectional view of the normally closed solenoid valve 100C as in FIG. 12, but the hatched display is omitted to show the path of the magnetic flux.

  As shown in FIG. 13, the course of magnetic flux in the normally closed electromagnetic valve 100C is the course of magnetic flux in the normally closed electromagnetic valve 100A according to the first embodiment and the magnetic flux in the normally closed electromagnetic valve 100B according to the second embodiment. It is a combination of the course of the. As a result, a larger area serving as a path for the magnetic flux can be secured, and the occurrence of magnetic saturation can be further suppressed.

(Fourth embodiment)
FIG. 14A is a diagram showing an example of the wheel cylinder pressure applied to the wheel cylinder 20, and FIG. 14B shows the normally closed electromagnetic valve according to the fourth embodiment as shown in FIG. It is a figure which shows the electric current supplied to the coil 130 when it is set as a wheel cylinder pressure. Note that the brake control device 10 of the fourth embodiment employs any of the normally closed electromagnetic valve 100A, the normally closed electromagnetic valve 100B, and the normally closed electromagnetic valve 100C, and the configuration of the other brake control device 10 is the first. This is the same as the first embodiment.

  The ECU 200 first sets the normally-closed electromagnetic valve in the state of STEP2 to close the current supplied to the coil 130 as the first mover on-current Ion. Next, the ECU 200 determines whether or not the state of maintaining the wheel cylinder pressure continues by determining whether or not the wheel cylinder pressure does not change over the threshold time Tc using the detection result of the wheel cylinder pressure sensor 44. Determine. If the wheel cylinder pressure does not change for the threshold time Tc or longer, the ECU 200 is considered likely to maintain the wheel cylinder pressure as it is, so the supply of current to the coil 130 is stopped and the normally closed solenoid valve is turned off. The valve is closed in the state of STEP1. Thereby, an increase in power consumption can be suppressed.

(Fifth embodiment)
FIG. 15 is a cross-sectional view showing in detail the configuration of a normally closed electromagnetic valve 100D according to the fifth embodiment. The configuration of the brake control device 10 is the same as that described above except that a normally closed solenoid valve 100D is provided instead of the above-described normally closed solenoid valve. Hereinafter, the same reference numerals are assigned to the same parts as those of the normally closed electromagnetic valve according to the above-described embodiment, and the description thereof is omitted. Unless otherwise specified, the operation procedure of the normally closed solenoid valve 100D is the same as that of the above-described normally closed solenoid valve.

  In the normally closed electromagnetic valve 100 </ b> D, a rod 212 is provided instead of the rod 112, and a first mover 216 is provided instead of the first mover 116. The rod 212 includes a first end portion 212a, a second end portion 212b, a first thin shaft portion 212c, a first locking portion 212d, a second thin shaft portion 212e, a second locking portion 212f, and a third thin shaft portion. 212g. Among these, the second end portion 212b, the first thin shaft portion 212c, the first locking portion 212d, the second thin shaft portion 212e, and the second locking portion 212f are the second end portion 112b and the first locking portion 212f of the rod 112, respectively. It is the same as the thin shaft portion 112c, the first locking portion 112d, the second thin shaft portion 112e, and the second locking portion 112f. The second end portion 212b functions as a valve element that prevents communication of the hydraulic fluid path by being seated on the valve seat 114b and allows communication of the hydraulic fluid path by being separated from the valve seat 114b. The first end portion 212a is formed in a hemispherical shape and is integrally coupled to the end portion of the first thin shaft portion 212c. The third thin shaft portion 212g is formed in a thin cylindrical shape that protrudes coaxially with the first thin shaft portion 212c from the tip of the first end portion 212a. The rod 212 is inserted into the rod sliding hole 110c of the guide 110 so as to be slidable in the axial direction so that the second end portion 212b faces the valve seat 114b of the seat 114.

  Here, the shape of the first mover 216 will be described in detail with reference to FIG. The first mover 216 is a magnetic body formed in a cylindrical shape. A bottomed receiving hole 216a is provided at one end of the first mover 216 coaxially with the central axis. A ball housing hole 216b is provided at the other end of the first mover 216 coaxially with the central axis. The accommodation hole 216a and the ball accommodation hole 216b communicate with each other through a flow path 216e. A first valve seat 216c is provided between the ball housing hole 216b and the flow path 216e. The first valve seat 216c is formed in a tapered shape that inclines so that the diameter gradually decreases from the end of the ball housing hole 216b. A second valve seat 216d is provided between the accommodation hole 216a and the flow path 216e. The second valve seat 216d is formed in a tapered shape that is inclined so that its diameter gradually increases toward the bottom of the first mover 216.

  Returning to FIG. The first mover 216 is disposed coaxially with the rod 212 on the second direction side of the second mover 118. At this time, the 1st needle | mover 216 is arrange | positioned so that the accommodation hole 216a may become the 1st direction side. The first mover 216 is restricted from moving in the first direction by the second valve seat 216d coming into contact with the first end 212a of the rod 212. The accommodation hole 216 a of the first mover 216 has an inner diameter larger than the outer diameter of the first shaft portion 118 a of the second mover 118. Therefore, a part of the first shaft portion 118a is accommodated in the accommodation hole 216a in a state where the second valve seat 216d is in contact with the first end portion 212a. Thus, the first movable element 216 and the second movable element 118 are respectively formed with overlapping portions that are adjacent to each other in the radial direction. In addition, a spacing portion is provided between the end surface of the first shaft portion 118a and the bottom surface of the accommodation hole 216a. Thereby, the magnetic flux which advances between the bottom part of the accommodation hole 216a and the edge part of the 1st axial part 118a is suppressed, and the adsorption | suction force between the 1st needle | mover 216 and the 2nd needle | mover 118 is reduced.

By inserting the guide 110 into the opening of the sleeve 120, a liquid chamber filled with the working fluid is formed. Therefore, the sleeve 120 and the guide 110 function as a storage member that forms a liquid chamber that stores the hydraulic fluid. The first mover 216 is disposed in the liquid chamber so as to divide the liquid chamber into two divided chambers. Hereinafter, of the two divided chambers, the second direction side will be described as the first divided chamber V1, and the first direction side will be described as the second divided chamber V2. The first mover 216 has an outer diameter that is slightly smaller than the inner diameter of the guide portion 120 b of the sleeve 120. For this reason, a gap is formed between the outer diameter of the first movable element 216 and the inner diameter of the guide part 120b in a state where the first movable element 216 is inserted through the guide part 120b. This gap functions as a flow path for hydraulic fluid communicating with the first divided chamber V1 and the second divided chamber V2. Hereinafter, this gap will be described as the flow path P1.
In addition, a groove communicating with the first divided chamber V1 and the second divided chamber V2 may be formed on the outer peripheral portion of the first movable element 216. This groove may function as a flow path for the hydraulic fluid communicating with the first divided chamber V1 and the second divided chamber V2 instead of the flow path P1. Further, the first movable element 216 may be formed with a through hole communicating with the first divided chamber V1 and the second divided chamber V2. This through hole may function as a flow path for hydraulic fluid communicating with the first divided chamber V1 and the second divided chamber V2 instead of the flow path P1.

  The normally closed solenoid valve 100D includes a first spring 222, a third spring 224, and a ball 226. In the compressed state, one end of the first spring 222 contacts the bottom of the spring accommodating hole 120 c of the sleeve 120, and the other end contacts the upper end of the first mover 216. As a result, the first spring 222 applies a biasing force toward the first direction to the first mover 216.

  The first mover 216 presses the rod 212 in the first direction by the biasing force of the first spring 222 when no current is supplied to the coil 130. Thereby, the 1st needle | mover 216 moves to a 1st direction with the rod 212, and makes the 2nd end part 212b seat to the valve seat 114b. When a current is supplied to the coil 130, the coil 130 moves in the second direction against the biasing force of the first spring 222 with the applied electromagnetic force. As a result, the first mover 216 is separated from the rod 212, and the application of the urging force to the rod 212 by the first spring 222 is released.

  The ball 226 is disposed inside the ball housing hole 216b of the first mover 216. In a state where the second valve seat 216d is in contact with the first end portion 212a, the third thin shaft portion 212g protrudes to the ball receiving hole 216b through the flow path 216e. For this reason, the ball 226 abuts on the upper end of the third thin shaft portion 212g and is restricted from moving in the first direction. In the compressed state, the third spring 224 has one end in contact with the bottom of the spring accommodating hole 120 c of the sleeve 120 and the other end in contact with the ball 226. Thereby, the third spring 224 gives the ball 226 an urging force in the first direction.

  With reference to FIGS. 17A to 17C, the operation of the normally closed electromagnetic valve 100D when shifting from STEP1 to STEP2 will be described first. Fig.17 (a) is a figure which shows the state of normally closed solenoid valve 100D in STEP1. In STEP1, the first movable element 216 is in a state in which the movement in the first direction is locked by the second valve seat 216d coming into contact with the first end 212a.

  When the first mover on-current Ion is supplied to the coil 130 from the state of STEP1, the first mover 216, which is a magnetic body, starts moving in the second direction by the applied electromagnetic force. On the other hand, the second mover 118, which is also a magnetic body, presses the rod 212 in the first direction by the applied electromagnetic force, and maintains the valve closed state. In the state of STEP1, the ball 226 is not seated on the first valve seat 216c. For this reason, immediately after the 1st needle | mover on-current Ion is supplied to the coil 130, it will be in the state which the 1st division chamber V1 and the 2nd division chamber V2 connected by the flow path 216e. For this reason, when the 1st needle | mover 216 moves to a 2nd direction, the hydraulic fluid of the 1st division | segmentation chamber V1 can flow through both the flow path 216e and the flow path P1, and can flow out into the 2nd division | segmentation chamber V2. Therefore, the flow resistance of the hydraulic fluid is low, and the first mover 216 can move at a relatively high speed. When the first armature 216 moves in the second direction, the urging force of the rod 212 in the first direction by the first spring 222 is released, and the second end 212b can be separated from the valve seat 114b. .

  FIG. 17B is a diagram illustrating a state of the normally closed electromagnetic valve 100D when a little time has elapsed after the first mover on-current Ion is supplied to the coil 130 from STEP1. When the first movable element 216 continues to rise, the ball 226 is seated on the first valve seat 216c of the first movable element 216, and the flow path 216e is blocked. The ball 226 is then pressed against the first mover 216 by the urging force of the third spring 224. As a result, when the first armature 216 is further raised, the hydraulic fluid in the first division chamber V1 mainly passes through the flow path P1 and flows out into the second division chamber V2, so that the state shown in FIG. The flow resistance of the hydraulic fluid increases, and the moving speed of the first mover 216 decreases. As described above, the ball 226 and the third spring 224 flow in the flow path that connects the first divided chamber V1 and the second divided chamber V2 when the first movable element 216 moves in the second direction in the liquid chamber. It functions as a flow resistance changing means for increasing resistance. Further, the ball 226 contacts the mover so as to block a part of the flow path connecting the first divided chamber V1 and the second divided chamber V2 when the first mover 216 moves in the liquid chamber in the second direction. It also functions as a contact member that comes into contact.

  FIG. 17C is a diagram illustrating a state of the normally closed electromagnetic valve 100D when the state of STEP2 is reached. The first mover 216 continues to move in the second direction by the applied electromagnetic force, and finally comes into contact with the main body 120 a of the sleeve 120. Since the 1st needle | mover 216 raises with an electromagnetic force, when approaching the main-body part 120a, an adsorption | suction force will generate | occur | produce between both and the 1st needle | mover 216 may contact | abut to the sleeve 120 at high speed. As described above, the first mover 216 closes the flow path 216e before coming into contact with the sleeve 120 to increase the flow resistance of the hydraulic fluid in the first divided chamber V1 and the second divided chamber V2. The contact speed of 216 to the sleeve 120 can be reduced, and the generation of abnormal noise can be suppressed.

  In a general normally closed solenoid valve, a movable element that divides a liquid chamber into two divided chambers is fixed to a rod having a valve element, and a flow path that communicates with the two divided chambers is formed in the movable element. It may be. In this case, before the mover moves in the second direction and comes into contact with the sleeve, a configuration is adopted in which a part of the flow path is blocked with a ball or the like to increase the flow resistance of the hydraulic fluid between the two divided chambers. May be. Further, in a general normally open solenoid valve, a movable element that divides the liquid chamber into two divided chambers is fixed to a rod having a valve element, and a flow path that communicates with the two divided chambers is formed in the movable element. It may be. In this case, before the mover moves in the second direction and comes into contact with the sleeve, a configuration is adopted in which a part of the flow path is blocked with a ball or the like to increase the flow resistance of the hydraulic fluid between the two divided chambers. May be. In addition, since a general normally closed solenoid valve and a normally open solenoid valve are well-known, detailed description regarding the structure is abbreviate | omitted.

  18A to 18C, the operation of the normally closed electromagnetic valve 100D when shifting from STEP 2 or STEP 3 to STEP 4 will be described first. Since the position of each component of the normally closed electromagnetic valve 100D is hardly changed between STEP2 and STEP3, the operation of the normally closed electromagnetic valve 100D when shifting from STEP2 to STEP4 will be described below as an example.

  FIG. 18A is a diagram illustrating a state of the normally closed electromagnetic valve 100D in STEP2. In STEP 2, the first movable element 216 is in contact with the main body 120 a of the sleeve 120. When the supply of current to the coil 130 is stopped from this state, the rod 212 starts to move in the second direction due to the hydraulic pressure of the hydraulic fluid and the urging force of the second spring 124. On the other hand, the first mover 216 starts moving in the first direction by the biasing force of the first spring 222 and the biasing force of the third spring 224.

  FIG. 18B is a diagram illustrating a state when the rod 212 and the first movable element 216 are in contact with each other. Note that the rod 212 and the first movable element 216 contact with each other is not limited to such a position. For example, the rod 212 is in the state in which the first movable element 216 is in contact with the main body 120a of the sleeve 120. 216 may abut.

  The rod 212 comes into contact with the first movable element 216 by the first end 212a seating on the second valve seat 216d, and the flow path 216e is closed. Since the urging force of the first spring 222 is larger than the urging force of the second spring 124, the first movable element 216 moves together in the first direction while pushing the rod 212 by the urging force of the first spring 222.

  At this time, the hydraulic fluid mainly flows from the second divided chamber V2 to the first divided chamber V1 through the flow path P1. For this reason, the flow resistance of the hydraulic fluid from the second division chamber V2 to the first division chamber V1 is increased, and the moving speed of the first movable element 216 in the first direction is reduced. Thus, the rod 212 increases the flow resistance of the flow path that connects the first divided chamber V1 and the second divided chamber V2 when the first movable element 216 moves in the liquid chamber in the first direction. It functions as a change means. In addition, the rod 212 is configured to block a part of the flow path that connects the first divided chamber V1 and the second divided chamber V2 when the first mover 216 moves in the liquid chamber in the first direction. It also functions as a contact member that contacts 216.

  FIG. 18C is a diagram illustrating a state of the normally closed electromagnetic valve 100D in STEP4. In STEP 4, the second end 212b of the rod 212 is seated on the valve seat 114b by the biasing force of the first spring 222 and the third spring 224, and the normally closed electromagnetic valve 100D is closed. Thus, before the second end 212b is seated on the valve seat 114b, the flow path 216e is closed to increase the flow resistance of the hydraulic fluid from the second divided chamber V2 to the first divided chamber V1, thereby increasing the second end. The seating speed of the portion 212b on the valve seat 114b can be reduced, and the generation of abnormal noise can be suppressed.

  In a general normally closed solenoid valve, a movable element that divides a liquid chamber into two divided chambers is fixed to a rod having a valve element, and a flow path that communicates with the two divided chambers is formed in the movable element. It may be. In this case, even when the valve element is seated on the valve seat and closed, a part of the flow path is blocked with a ball or the like to increase the flow resistance of the hydraulic fluid between the two divided chambers. Good. Further, in a general normally open solenoid valve, a movable element that divides the liquid chamber into two divided chambers is fixed to a rod having a valve element, and a flow path that communicates with the two divided chambers is formed in the movable element. It may be. In this case, even when the valve element is seated on the valve seat and closed, a part of the flow path is blocked with a ball or the like to increase the flow resistance of the hydraulic fluid between the two divided chambers. Good. Since a general normally closed solenoid valve and a normally open solenoid valve are known, a detailed description of the structure is omitted.

  The present invention is not limited to the above-described embodiments, and an appropriate combination of the elements of each embodiment is also effective as an embodiment of the present invention. Various modifications such as design changes can be added to each embodiment based on the knowledge of those skilled in the art, and embodiments to which such modifications are added can also be included in the scope of the present invention.

It is a systematic diagram of the brake control device concerning a 1st embodiment. It is sectional drawing which shows the structure of the normally closed solenoid valve mounted in the brake control apparatus which concerns on 1st Embodiment in detail. It is a figure which shows the path | route of the magnetic flux of the normally closed solenoid valve which concerns on 1st Embodiment. An example of the change over time of the current supplied to the coil from STEP1 to STEP4 of the normally closed solenoid valve, the position of the first mover, the position of the second mover at each time point, and the normally closed solenoid valve opened and closed FIG. (A) is a figure which shows the state of the normally closed solenoid valve in STEP1, (b) is a figure which shows the state of the normally closed solenoid valve in STEP2, (c) is a figure of the normally closed solenoid valve in STEP3. It is a figure which shows a state, (d) is a figure which shows the state of the normally closed solenoid valve in STEP4. It is a figure which shows the relationship between the 1st gap g1, and the attraction | suction force between a 1st needle | mover and a sleeve. It is a figure which shows the relationship between the 2nd gap g2, and the attraction | suction force between a 2nd needle | mover and a guide. In STEP1-STEP4, it is a figure which shows the relationship between the attraction force which the 1st needle | mover tries to move to a 2nd direction, and the attraction | suction force which a 2nd mover tends to move to a 1st direction. (A) is a figure which shows an example of the wheel cylinder pressure which changes with time, (b) changes a wheel cylinder pressure like (a) in the normally closed solenoid valve which concerns on 1st Embodiment. It is a figure which shows the electric current supplied to a coil sometimes. It is sectional drawing which shows the structure of the normally closed solenoid valve mounted in the brake control apparatus which concerns on 2nd Embodiment in detail. It is a figure which shows the path | route of the magnetic flux of the normally closed solenoid valve which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the normally closed solenoid valve mounted in the brake control apparatus which concerns on 3rd Embodiment in detail. It is a figure which shows the path | route of the magnetic flux of the normally closed solenoid valve which concerns on 3rd Embodiment. (A) is a figure which shows an example of the wheel cylinder pressure given to a wheel cylinder, (b) is a wheel cylinder pressure like (a) in the normally closed solenoid valve which concerns on 4th Embodiment. It is a figure which shows the electric current supplied to a coil. It is sectional drawing which shows the structure of the normally closed solenoid valve which concerns on 5th Embodiment in detail. It is sectional drawing of the 1st needle | mover which concerns on 5th Embodiment. (A) is a figure which shows the state of the normally closed solenoid valve which concerns on 5th Embodiment in STEP1, (b) is a little time passes since the 1st needle | mover on-current Ion is supplied to a coil from STEP1. It is a figure which shows the state of the normally closed solenoid valve at the time of having performed, (c) is a figure which shows the state of the normally closed solenoid valve when it has reached the state of STEP2. (A) is a figure which shows the state of the normally closed solenoid valve which concerns on 5th Embodiment in STEP2, (b) is a figure which shows a state when a rod and a 1st needle | mover contact | abut each other. (C) is a figure which shows the state of the normally closed solenoid valve in STEP4.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Brake control apparatus, 114 seat, 114a hydraulic fluid path, 114b valve seat, 118 2nd needle | mover, 120 sleeve, 120a main-body part, 120b guide part, 124 2nd spring, 130 coil, 212 rod, 212a 1st end part 212g third thin shaft portion, 216 first mover, 216c first valve seat, 216d second valve seat, 216e flow path, 222 first spring, 224 third spring, 226 ball.

Claims (8)

A storage member in which a liquid chamber for storing a working fluid is formed;
A mover arranged in the liquid chamber so as to separate the liquid chamber into two separation chambers and having a flow path communicating between the two separation chambers;
Flow resistance changing means for increasing the flow resistance of the working fluid through the flow path when the mover moves in the liquid chamber;
A solenoid valve comprising:   The flow resistance changing means is a contact that increases the flow resistance of the working fluid through the flow path by contacting the mover so as to block a part of the flow path when the mover moves in the liquid chamber. The electromagnetic valve according to claim 1, further comprising a member. A valve seat interposed in the hydraulic fluid path;
The hydraulic fluid is provided so as to be movable in a first direction toward the valve seat and in a second direction away from the valve seat, and is prevented from communicating with the hydraulic fluid path by being seated on the valve seat and separated from the valve seat. A valve that connects the road,
Further comprising
The movable element is provided to move in the second direction when the valve element is separated from the valve seat,
The electromagnetic valve according to claim 2, wherein the contact member contacts the mover so as to block a part of the flow path when the mover moves in the second direction. Biasing means for imparting a biasing force toward the valve element in a first direction so that the valve element is seated on the valve seat;
A coil wound around the mover;
Further comprising
The said mover is provided so that it may move in a 2nd direction against the urging | biasing force of the said urging | biasing means with the electromagnetic force given when an electric current is supplied to the said coil. Solenoid valve. The urging means applies an urging force in the first direction to the mover. The mover is urged by the urging means with the valve element in the first direction when no current is supplied to the coil. When the valve element is seated on the valve seat and current is supplied to the coil, the valve moves in the second direction against the urging force of the urging means by the electromagnetic force applied. The solenoid valve according to claim 4, wherein the solenoid valve is separated from the child. A valve seat interposed in the hydraulic fluid path;
The hydraulic fluid is provided so as to be movable in a first direction toward the valve seat and in a second direction away from the valve seat, and is prevented from communicating with the hydraulic fluid path by being seated on the valve seat and separated from the valve seat. A valve that connects the road,
Further comprising
The movable element is provided to move in the first direction together with the valve element so that the valve element is seated on the valve seat,
The electromagnetic valve according to claim 2, wherein the abutting member abuts the movable element so as to block a part of the flow path when the movable element moves in the liquid chamber in the first direction. . Biasing means for applying a biasing force in the first direction to the valve element so that the valve element is seated on the valve seat;
The electromagnetic valve according to claim 6, wherein the movable element is provided so as to move in the first direction together with the valve element by an urging force of the urging means to seat the valve element on the valve seat. . A coil wound around the mover;
The biasing means applies a biasing force toward the first direction to the mover,
When the current is not supplied to the coil, the mover moves in the first direction together with the valve element by the urging force of the urging means to seat the valve element on the valve seat, The electromagnetic valve according to claim 7, wherein the electromagnetic valve is separated from the valve element by moving in a second direction against an urging force of the urging means with an electromagnetic force applied when the is supplied.

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