JPH1163276A - Solenoid valve device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention can reliably suppress occurrence of chattering without being greatly affected by temperature during use.
And, with respect to the fluctuation of the magnitude of the current of the electromagnetic coil,
Obtain an electromagnetic valve device to which the rod responds accurately. SOLUTION: In the solenoid valve device of the present invention, the movable iron core 2 is provided.
0 has a flow hole 22 provided with a throttle portion 22a at the end and formed along the axial direction and capable of holding and moving the buffer oil 30 accompanying the movement of the movable core 20, The flow holes 22 are adapted to adjust the buffering force of the buffer oil 30 against fluctuations of the movable iron core 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, for controlling a current flowing through an electromagnetic coil to adjust a clearance between an opening of a valve seat and a valve to control a hydraulic pressure in a flow passage. The present invention relates to an electromagnetic valve device.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing the structure of a conventional solenoid valve device. In the figure, this solenoid valve device is displaced by an electromagnetic coil 2 formed by winding an insulated copper wire around a bobbin 1 made of an insulating member, and a magnetic field generated by the electromagnetic coil provided inside the electromagnetic coil 2. A movable iron core 3 made of a magnetic material, a rod 4 made of a non-magnetic material having the movable iron core 3 inserted therein and having a conical valve portion 4a at the distal end, and a movable iron core 3 attached to one end of the bobbin 1. A yoke 6 made of a magnetic material fixed to the other end in the bobbin 1, a first bearing 6 a provided between the yoke 6 and the rod 4, Fixed iron core 5
A second bearing 5 a is provided between the armature and the rod 4, and a nonmagnetic joint 7 is interposed between the fixed iron core 5 and the yoke 6. The buffer oil 30 is contained in the buffer chamber A surrounded by the fixed iron core 5, the joint 7, and the yoke 6, and the movable iron core 3 receives the fluid resistance of the buffer oil 30 against the movement. Has become.

The solenoid valve device comprises a valve seat 8 having an opening 8c with which a valve portion 4a of the rod 4 contacts, an input port 8a and a discharge port 8b, and a rod 4 provided on one side of the rod 4 to connect the rod 4 to the input port. A coil spring 9 for urging toward the side 8a; an adjusting screw 10 for contacting the end of the coil spring 9 and moving in the axial direction of the rod 4 to adjust the urging force of the coil spring 9;
A plate 11 fixed to the end face and the fixed iron core 5, and an outer case 12 covering the above members. In addition,
The case 12, the plate 11, the fixed core 5, the movable core 3, and the yoke 6 constitute a magnetic circuit.

Next, the operation of the solenoid valve device having the above-described configuration will be described with reference to FIGS. When the electromagnetic coil 2 is not energized, the resilience of the coil spring 9 pressing the rod 4 toward the opening 8c is greater than the oil pressure of the control oil 31 in the input port 8a, and the valve 4a is connected to the opening 8c. We are in pressure contact. Therefore, the control oil 31 in the pipe in which the orifice 32 is incorporated does not flow, and the control oil 31 at that time does not flow.
Is the output pressure from the output unit 33.

When the electromagnetic coil 2 is energized in this state, a magnetic field is generated in the electromagnetic coil 2, and this magnetic field causes the movable core 3 to resist the stress of the coil spring 9 and the fluid resistance of the buffer oil 30. The suction is performed toward the fixed iron core 5, and the clearance between the valve portion 4 a of the rod 4 and the opening 8 c of the valve seat 8 increases. As a result, the input port 8a
, The amount of control oil 31 flowing to the discharge port 8b through the opening 8c increases, the pressure on the output unit 33 decreases, and the reduced pressure is output from the output unit 33. The output pressure of the output unit 33 in this case corresponds to the magnitude of the current of the electromagnetic coil 2.

[0006]

In the above-described conventional solenoid valve device, the movable member generated by the stress of the coil spring 9, the supply pressure of the control oil 31 supplied to the input port 8a, and the magnetic field of the electromagnetic coil 2. Although the output pressure from the output unit 33 is controlled by balancing the suction force with respect to the iron core 3, the rod 4 does not move due to fluctuations in the supply pressure of the control oil 31.
Chattering that continuously fluctuates occurs, and the output unit 3
There was a problem that the output pressure from No. 3 could not be controlled normally.

In order to prevent chattering, for example, all the inner diameters of the yoke 6, the fixed iron core 5, and the joint 7 are reduced, and the gap between the inner peripheral surface and the outer peripheral surface of the movable iron core 3 is reduced. It is conceivable to reduce the gap 34 and increase the fluid resistance of the buffer oil 30 against the movement of the movable iron core 3 to make the movement of the movable iron core 3 in the buffer chamber A slower. However, the viscosity of the buffer oil 30 in the buffer chamber A greatly differs depending on the temperature. When the temperature of the buffer oil 30 is low, the viscosity of the buffer oil 30 is high. The fluid resistance of the buffer oil 30 flowing through the gap 34 formed over the gap is too large, and the rod 4 does not quickly and accurately respond to a change in the magnitude of the current of the electromagnetic coil 2. However, there is a problem that the output pressure cannot be controlled normally. on the other hand,
When the gap 34 is increased, the rod 4 responds quickly and accurately when the temperature of the buffer oil 30 is low, but at a high temperature where the viscosity of the buffer oil 30 decreases, the oil 30 However, there is a problem that the fluid resistance becomes too small and chattering easily occurs.

When the entire solenoid valve device is completely immersed in oil and used, air does not enter the buffer chamber A, but the solenoid valve device is temporarily exposed from the oil surface. In such a situation, air with low fluid resistance enters the buffer chamber A, and in this case, there is a problem that chattering easily occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and the occurrence of chattering can be reliably suppressed without being greatly affected by the temperature during use. An object of the present invention is to provide a solenoid valve device in which a rod responds quickly and accurately to fluctuations in the magnitude of a current.

[0010]

In the solenoid valve device according to the first aspect of the present invention, the movable iron core has a throttle portion at an end and is formed along the axial direction, and is buffered as the movable iron core moves. It has a flow hole through which the oil moves, and the flow hole adjusts the buffering force of the buffer oil against the fluctuation of the movable iron core.

Further, in the solenoid valve device according to the second aspect, the joint has a projecting portion projecting inward with an inner diameter smaller than the inner diameter of the fixed iron core and the yoke. Thus, the buffering force is adjusted.

Further, in the solenoid valve device according to the third aspect, the movable iron core has a throttle portion at an end thereof and is formed along the axial direction so that the buffer oil moves with the movement of the movable iron core. The joint has a protrusion protruding inward with an inner diameter smaller than the inner diameters of the fixed core and the yoke, and the buffering force of the buffer oil against fluctuation of the movable core is reduced by the protrusion and the flow hole. It is intended to be adjusted.

In the electromagnetic valve device according to the fourth aspect, the buffer chamber and the discharge port communicate with each other through a communication hole formed in the yoke.

In the electromagnetic valve device according to the fifth aspect, the rod is disposed so as to be horizontal, and the communication hole communicates between the upper portion of the buffer chamber and the discharge port, and extends upward. The tip of the formed discharge port is located above the communication hole.

Further, in the solenoid valve device according to the present invention, the rod is disposed so as to be horizontal, and the air having entered the buffer chamber through the first communication hole communicating the upper portion of the buffer chamber and the discharge port. Is discharged to the discharge port, and the oil in the discharge port is introduced into the buffer chamber by a second communication hole communicating the lower part of the buffer chamber and the discharge port. .

Further, in the solenoid valve device according to the present invention, the rod is formed with a flow path for guiding the oil in the input port into the buffer chamber through the distal end portion.

In the electromagnetic valve device according to the eighth aspect, the flow path in the rod is formed in a main flow path formed extending in the axial direction from the tip of the rod, and the main flow path is branched from the main flow path and formed in the buffer chamber. It is composed of a first branch flow path that guides oil toward the fixed iron core, and a second branch flow path that branches off from the main flow path and guides oil toward the yoke in the buffer chamber.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a solenoid valve device according to Embodiment 1 of the present invention will be described. In the following description, the same components as those in FIGS. 6 and 7 are denoted by the same reference numerals. FIG. 1 is a sectional view of the solenoid valve device according to the first embodiment, and FIG. 2 is an enlarged view of a main part of FIG. In the figure, this electromagnetic valve device is configured such that an electromagnetic coil 2 formed by winding an insulated copper wire around a bobbin 1 made of an insulating member and a magnetic field generated inside the electromagnetic coil 2 provided inside the electromagnetic coil 2 cause displacement. Core 20 made of a magnetic material that is to be inserted, and a conical valve portion 4 having the movable core 20 inserted therein and having a distal end portion.
and a fixed core 5 fixed to one end of the bobbin 1 so as to face the movable core 20.
A yoke 6 made of a magnetic material fixed to the other end of the bobbin 1, and a first yoke 6 provided between the yoke 6 and the rod 4.
, A second bearing 5 a provided between the fixed iron core 5 and the rod 4, and a nonmagnetic joint 21 interposed between the fixed iron core 5 and the yoke 6. .

A flow hole 22 is formed in the movable iron core 20 along the axial direction, and a flow hole 22 on the fixed iron core 5 side is formed.
To the end of the narrowed portion 22a thickness l ₂ is formed. In this embodiment, only one circulation hole 22 is formed in the movable iron core 20, but a plurality of circulation holes may be formed at equal intervals in the circumferential direction. The inside of the buffer chamber A surrounded by the fixed core 5, the joint 21, and the yoke 6 is fixed to the fixed core side buffer chamber A ₁ and the yoke by a protrusion 21 a projecting inward from the inner wall surface of the fixed core 5 and the yoke 6. It is defined in the side buffer chamber a _2. A path dimension l ₁ is provided between the inner peripheral surface of the protrusion 21 a and the outer peripheral surface of the movable core 20.
Gap 23 is provided.

The solenoid valve device includes a valve seat 8 having an opening 8c, an input port 8a, and a discharge port 8b, with which the valve portion 4a of the rod 4 abuts, and a rod 4 provided on one side of the rod 4 for connecting the rod 4 to the input port. A coil spring 9 for urging toward the side 8a; an adjusting screw 10 for contacting the end of the coil spring 9 and moving in the axial direction of the rod 4 to adjust the urging force of the coil spring 9;
A plate 11 fixed to the end face and the fixed iron core 5, and an outer case 12 covering the above members. In addition,
Case 12, plate 11, fixed iron core 5, movable iron core 20
And the yoke 6 constitute a magnetic circuit.

Next, the operation of the solenoid valve device of the first embodiment will be described. When power is not supplied to the electromagnetic coil 2,
The stress of the coil spring 9 acting on the rod 4 is larger than the hydraulic pressure of the control oil 31 from the input port 8a, and the valve portion 4a closes the opening 8c of the valve seat 8, and at this time, the input port 8a The oil pressure of the control oil 31 is output from the output unit 33 as an output pressure.

When power is supplied to the electromagnetic coil 2 in this state, a magnetic field is generated in the electromagnetic coil 2, and this magnetic field causes the movable iron core 20 to resist the elastic force of the coil spring 9 and the fluid resistance of the buffer oil 30. As a result, the pressure is sucked toward the fixed iron core 5, and the clearance between the valve portion 4 a of the rod 4 and the opening 8 c of the valve seat 8 increases. As a result, input port 8
a, the oil amount of the control oil 31 flowing out to the discharge port 8b through the opening 8c increases, the oil pressure on the input port 8a side decreases, and the output pressure from the output unit 33 having the same pressure as the input port 8a decreases. I do. The output pressure of the output unit 33 in this case corresponds to the magnitude of the current of the electromagnetic coil 2.

Incidentally, when chattering is about to occur due to fluctuations in the supply pressure of the control oil 31 supplied to the input port 8a, that is, the rod 4 moves in the direction to close the opening 8c, The movable iron core 20 integrated with this also moves in the same direction. In this case, for the movement of the movable core 20 acts as a buffer for the oil 30 within the buffer chamber A moves from the yoke side buffer chamber A ₂ to the fixed iron core side buffer chamber A ₁ is fluid resistance, movement of the movable core 20 That is, the movement of the rod 4 becomes slow. Similarly, when the rod 4 moves in the opening direction of the opening 8 c and the movable core 20 integral with the rod 4 also attempts to move in the same direction, the fixed iron core in the buffer chamber A does not respond to the movement of the movable core 20. buffering oil 30 to move from the side buffer chamber a ₁ on the yoke side buffer chamber a ₂ acts as a fluid resistance, movement of the movable core 20, i.e. the movement of the rod 4 becomes slow. The cross-sectional area of the flow passage of the constricted portion 22a is larger than the cross-sectional area of the flow passage of the gap 23 having a gap size of 0.6 mm or less. buffering oil 30 of the inner mainly moved between through the throttle portion 22a of the flow hole 22 and the stationary core side buffer chamber a ₁ and yoke side buffer chamber a _2.

As described above, in this embodiment, the rod 4 reciprocates slowly due to the buffering action of the buffer oil 30 in the buffer chamber A, and the amplitude of the rod 4 is reduced, so that the chattering of the rod 4 is achieved. Can be suppressed. In addition, when the temperature of the buffer oil 30 decreases, the fluid resistance of the buffer oil 30 increases with an increase in the viscosity of the buffer oil 30, but in this embodiment, the thickness of the throttle portion 22a having a small flow path cross-sectional area is reduced. l ₂ and the path dimension l ₁ of the gap 23 are short, and an increase in the fluid resistance of the buffer oil 30 due to a decrease in the flow path cross-sectional area is suppressed. There is no inconvenience that the rod 4 does not quickly and reliably respond to the fluctuation of the current value of the electromagnetic coil 2 due to the fluid resistance becoming too large.

In order to quickly and surely respond to the fluctuation of the current value of the electromagnetic coil 2 and to suppress the occurrence of chattering, the joint 21 having the projecting portion 21a is connected to the fixed iron core 5 and the yoke 6 And the movable iron core 20 having the through hole 22 having the constricted portion 22a at the end is fixed to the rod 4. However, in this case, either the joint or the movable iron core having the through hole is provided. You may. That is, by adjusting the size of the gap between the joint and the movable core and the path length of the gap, it is possible to adjust the buffering force of the buffer oil against fluctuations in the movable core,
It is possible to obtain an electromagnetic valve device in which the rod responds quickly and reliably and can suppress occurrence of chattering. Also, by adjusting the thickness of the constricted portion of the flow hole, the inner diameter of the flow hole, and the number of the flow holes, it is possible to adjust the buffering force of the buffer oil against the fluctuation of the movable iron core, and the rod responds quickly and reliably. In addition, it is possible to obtain an electromagnetic valve device that can suppress occurrence of chattering.

Embodiment 2 FIG. FIG. 3 is a sectional view showing the configuration of the solenoid valve device according to the second embodiment. The solenoid valve device according to this embodiment has a tank (not shown) in which the oil level changes.
It is used by being immersed in oil inside. In the electromagnetic valve device, a communication hole 25 that faces the front end portion in the upper space of the yoke-side buffer chamber A ₂ are formed through the yoke 6, the yoke-side buffer chamber A ₂ and the discharge port 8b and the communicating hole 2
It communicates through 5. In addition, the fixed iron side buffer room A ₁
A communication hole 24 whose front end faces the upper space is formed to penetrate through the fixed iron core 5 and the bobbin 1, and the fixed iron core buffer chamber A ₁ and the outside communicate with each other through the communication hole 24. The solenoid valve device is installed such that the rod 4 is in the horizontal direction, and the distal end of the upwardly extending discharge port 8 b is located above the communication hole 25.

This solenoid valve device is used by being immersed in oil in a tank (not shown) in which the height of the oil level changes. When the solenoid valve device is operated, for example, the height of the oil level in the tank is increased. Due to the change, the oil is temporarily exposed on the oil surface, so that the oil in the buffer chamber A flows out through the first bearing 6a, the second bearing 5a, and the like, and air may enter the buffer chamber A. However, at this time, when the solenoid valve device is immersed again in oil, oil is supplied from the communication hole 25 and the communication hole 24
The air is exhausted from. Therefore, it is possible to prevent the air that has a small buffering effect against the fluctuation of the movable core 20 in the buffer chamber A from remaining for a long time and adversely affects the suppression of the chattering, and the occurrence of chattering on the rod 4 can be suppressed.

In this solenoid valve device, the discharge port 8
b extends upward and the distal end of the discharge port 8b is located above the communication hole 25, so that the oil in the buffer chamber A of the solenoid valve device is discharged through the communication port 25 through the discharge port 8b.
b is not discharged outside. The tip portion faces the upper space of the easily fixed core side buffer chamber A ₁ accumulated air and communicating the tip portion of the hole 25 is also similarly to air stagnation tends yoke side buffer chamber A ₂ of the communicating hole 24 because it faces the headspace, for example air temporarily staying in the yoke side buffer chamber a in ₂ is replaced with control oil 31 in the discharge port 8b through the communication hole 25.

Embodiment 3 FIG. 4 is a sectional view showing the configuration of the third embodiment. In this embodiment, unlike the point of forming a communicating hole 26 that faces the front end portion in the lower space of the yoke-side buffer chamber A ₂ in yoke 6 is an electromagnetic valve device of the second embodiment, the other components are the same as is there.

In this solenoid valve device, the yoke side buffer chamber A ₂
When the air staying in the upper part of the inside is replaced with the control oil 31, the communication hole 26 serves as an introduction path of the control oil 31, and the communication hole 25 serves as an air discharge path. air-yoke in the buffer chamber a ₂ as compared with the solenoid valve device is smoothly replaced with control oil 31 in the discharge port 8b.

Embodiment 4 FIG. FIG. 5 is a sectional view showing the configuration of the fourth embodiment. In this embodiment, the rod 27
A main flow path 27a is formed along the axial direction of the rod 27. This is from the middle of the main channel 27a and the first branch passage 27b ₁ is formed leading to the yoke side buffer chamber A _2, also from the rear end of the main channel 27a first leading to the fixed core side buffer chamber A ₂ second branch passage 27b ₂ is formed. Other components are the same as those of the second embodiment. The rod 27 may use, for example, a hollow pipe, close the rear end, and form a flow path perpendicular to the middle.

In this solenoid valve device, the tip of the main flow path 27a faces the input port 8a of the valve seat 8, and the control oil 31 from the input port 8a receives the main flow path 27a and the first
Of being discharged to the outside from the discharge port 8b through the branch flow path 27b through the communicating hole 25 of the yoke-side buffer chamber A ₂ through _1. Moreover, the control oil 31 main flow path 27a from the input port 8a, the second branch passage 27b ₂ is guided to the fixed core side buffer chamber A ₁ through, then the control oil 31 mainly flow hole 22, the yoke The side buffer chamber A ₂ is discharged to the outside from the discharge port 8b through the communication hole 25. Thus, the fixed iron core side buffer chamber A ₁ and the yoke-side buffer chamber A ₂ derived actively control oil 31 by the hydraulic control oil 31 at the input port 8a, buffer within buffer chamber A Used as oil,
Even if air enters the buffer chamber A, it is discharged to the outside of the buffer chamber A. In this embodiment, the communication holes 24, 2
5, the rod 27 can be applied to an electromagnetic valve device having no communication holes 24 and 25. In this case, the buffer chamber A is provided through the first bearing 6a and the second bearing 5a.
When the oil inside the buffer chamber A flows out, the input port 8a
Control oil 31 is positively replenished by hydraulic pressure.

[0033]

As described above, according to the solenoid valve device of the first aspect of the present invention, the movable iron core is provided with a constricted portion at the end and formed along the axial direction and has a movable core. It has a flow hole for holding and moving the buffer oil along with the movement, and this flow hole adjusts the buffering force of the buffer oil against the fluctuation of the movable iron core, so that chattering The generation can be suppressed, and the rod responds quickly and reliably to a change in the current value of the electromagnetic coil even when the temperature of the buffer oil decreases in which the fluid resistance increases.

According to the solenoid valve device of the second aspect, the joint has a projecting portion projecting inward with an inner diameter smaller than the inner diameters of the fixed iron core and the yoke, and the projecting portion has a function of restricting the buffering oil. , And adjusts the buffering force of the buffer oil against fluctuations in the movable iron core, so that chattering can be suppressed and the electromagnetic resistance increases even when the temperature of the buffer oil drops, which increases the fluid resistance. The rod responds quickly and reliably to fluctuations in the coil current value.

According to the solenoid valve device of the third aspect, the movable iron core has a throttle portion at an end and is formed along the axial direction to hold the buffer oil with the movement of the movable iron core. The joint has a flow hole that allows movement, and the joint has a protrusion that projects inward with an inner diameter smaller than the inner diameter of the fixed iron core and the yoke and has a function of restricting buffer oil. The flow hole adjusts the buffering force of the buffer oil against fluctuations of the movable iron core, so that chattering can be more reliably suppressed and the temperature of the buffer oil at which fluid resistance increases The rod responds more quickly and more reliably to fluctuations in the current value of the electromagnetic coil even when the temperature decreases.

According to the fourth aspect of the present invention, since the buffer chamber and the discharge port communicate with each other through the communication hole formed in the yoke, when the buffer oil in the buffer chamber flows out, the communication is established. The buffer oil is replenished into the buffer chamber through the hole, and the buffer chamber can maintain the buffering action against the fluctuation of the movable iron core due to the buffer oil.

According to the electromagnetic valve device of the fifth aspect, the rod is disposed so as to be horizontal, and the communication hole communicates the upper part of the buffer chamber with the discharge port. Since it extends upward and the tip of the discharge port is located above the communication hole, the buffer oil in the buffer chamber is not discharged to the outside through the communication hole and the discharge port.

According to the electromagnetic valve device of the sixth aspect, the rod is disposed so as to be horizontal, and the first communication hole for discharging the air in the buffer chamber to the discharge port is formed between the upper portion of the buffer chamber and the first communication hole. Since the second communication hole communicating with the discharge port and introducing the oil of the discharge port into the buffer chamber communicates with the lower portion of the buffer chamber and the discharge port, even if air enters the buffer chamber. The air is smoothly discharged from the first communication hole, and the oil is smoothly introduced into the buffer chamber through the second communication hole.

According to the electromagnetic valve device of the present invention, since the rod has a flow passage for guiding oil from the input port into the buffer chamber from the distal end portion, the input port is provided in the buffer chamber. Oil is reliably introduced, and this oil is used as a buffering oil.

According to the electromagnetic valve device of the eighth aspect, the flow path in the rod is formed by a main flow path extending in the axial direction from the tip of the rod, and a buffer formed by branching from the main flow path. The buffer chamber is composed of a first branch flow path that guides oil to the fixed iron core side in the room and a second branch flow path that is formed by branching from the main flow path and guides oil to the yoke side in the buffer chamber. The oil is reliably introduced through the first branch flow path and the second branch flow path, and is used as a buffer oil.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a solenoid valve device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view showing a configuration of a solenoid valve device according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a configuration of a solenoid valve device according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of a solenoid valve device according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration of a conventional solenoid valve device.

FIG. 7 is an explanatory diagram of a pressure control mechanism using an electromagnetic valve device.

[Explanation of symbols]

Reference Signs List 1 bobbin, 2 electromagnetic coil, 4 rod, 4a valve section, 5 fixed iron core, 6 yoke, 8 valve seat, 8a
Input port, 8b discharge port, 8c opening, 9
Coil spring, 20 movable iron core, 21 joint, 21a projection, 22 flow hole, 22a throttle,
23 gap, 24, 25, 26 communication hole, 27 rod, 27a main channel, 27b _1st branch channel, 27
b ₂ a second branch flow path, 30 a buffer for oil, 31 for controlling oil, A buffer chamber, _{A 1} fixed iron core side buffer chamber, _{A 2-yoke} buffer chamber.

Claims (8)

[Claims] An electromagnetic coil for generating a magnetic field by applying a current to a bobbin by applying a current to the bobbin; a fixed core fixed to one end of the bobbin; and a fixed core fixed to the other end of the bobbin. A yoke made of a magnetic material, a non-magnetic material joint fixed between the fixed iron core and the yoke and forming a buffer chamber holding buffer oil together with the fixed iron core and the yoke; A movable iron core that is provided in the buffer chamber to face to the fixed iron core side by the electromagnetic attraction force of the electromagnetic coil while receiving the fluid resistance of the buffer oil, and is movable in the buffer chamber; A rod having a valve portion at its tip end integral with the inserted movable iron core, and a split provided at a rear end portion of the rod and biasing the rod in a direction opposite to the electromagnetic attraction force. A valve seat that has an input port, a discharge port, and an opening communicating with the input port and the discharge port, and that opens and closes the opening by moving the rod so that the valve portion contacts and separates from the opening. The movable iron core has a flow hole in which a throttle portion is provided at an end and formed along the axial direction and through which the buffering oil moves along with the movement of the movable iron core. An electromagnetic valve device adapted to adjust a buffering force of the buffer oil against a fluctuation of a movable iron core. 2. An electromagnetic coil for generating a magnetic field by applying a current by winding a conductive wire around a bobbin, a fixed iron core fixed to one end of the bobbin, and a fixed core fixed to the other end of the bobbin. A yoke made of a magnetic material, a joint made of a non-magnetic material fixed between the fixed iron core and the yoke and forming a buffer chamber for holding buffer oil together with the fixed iron core and the yoke; and the fixed iron core. And a movable iron core that is provided in the buffer chamber, is opposed to the movable iron core that is sucked while receiving the fluid resistance of the buffering oil toward the fixed iron core by the electromagnetic attraction force of the electromagnetic coil, and is movable in the buffer chamber, and penetrates the buffer chamber. A rod provided integrally with the inserted movable iron core and having a valve portion at a distal end thereof, and a spring provided at a rear end of the rod and biased in a direction opposite to the electromagnetic attraction force. An input port, a discharge port, and a valve seat that has an opening communicating with the input port and the discharge port, and has a valve seat that opens and closes the opening by contacting and separating the opening with the opening as the rod moves. The joint has a protrusion protruding inward with an inner diameter smaller than the inner diameters of the fixed core and the yoke, so that the buffering force of the buffer oil against fluctuation of the movable iron core is adjusted by the protrusion. Becoming a solenoid valve device. 3. The joint has a protrusion projecting inward with an inner diameter smaller than the inner diameters of the fixed iron core and the yoke, and the protrusion adjusts a buffering force of the buffer oil against fluctuations of the movable iron core. The solenoid valve device according to claim 1, wherein 4. The solenoid valve device according to claim 1, wherein the buffer chamber and the discharge port communicate with each other through a communication hole formed in the yoke. 5. A rod is disposed so as to be horizontal, a communication hole communicates with an upper portion of the buffer chamber and the discharge port, and a distal end portion of the discharge port formed to extend upward is provided. 5. The solenoid valve device according to claim 4, wherein the solenoid valve device is located above the communication hole. 6. A rod is disposed so as to be horizontal, a first communication hole for discharging air in the buffer chamber communicates with outside air at an upper portion of the buffer chamber, and oil in the discharge port is removed. The solenoid valve device according to claim 4, wherein the second communication hole introduced into the buffer chamber communicates a lower portion of the buffer chamber with the discharge port. 7. The electromagnetic valve device according to claim 1, wherein the rod has a flow path formed therein for guiding oil from an input port into the buffer chamber through the distal end portion. 8. The flow path includes a main flow path formed extending in the axial direction from the distal end of the rod, and a first branch flow branched from the main flow path and configured to guide oil toward the fixed iron core in the buffer chamber. 8. A flow path, and a second branch flow path formed by branching from the main flow path and guiding oil to a yoke side in the buffer chamber.
The solenoid valve device according to claim 1.