JP6405944B2 - Brake device - Google Patents

Description

  The present invention relates to a brake device including a stroke simulator that absorbs a stroke of a brake pedal and generates a reaction force.

  Conventionally, as this type of brake device, for example, there is one described in Patent Document 1. The brake device described in Patent Document 1 generates a reaction force on the metal simulator spring when the brake pedal is initially depressed, and also generates a reaction force on the rubber damper while the brake pedal is depressed. The reaction force is smoothly changed to obtain a good braking operation feeling.

JP 2010-925 A

  However, in the conventional brake device, if the rubber damper sags due to long-term use, the reaction force cannot be changed smoothly, and therefore a good braking operation feeling can be obtained over a long period of time. I could not.

  An object of this invention is to make it possible to obtain a favorable braking operation feeling over a long period of time in a brake device including a stroke simulator.

  In order to achieve the above object, according to the first aspect of the present invention, the brake pedal (1) operated by the driver and the pistons (21, 22) are driven by the operation force input to the brake pedal to thereby generate brake fluid. A brake device comprising a master cylinder (2) for generating pressure and a stroke simulator (3) for absorbing a stroke of the brake pedal and generating a reaction force, the stroke simulator starting from the initial position of the brake pedal A first reaction force generating portion (33) for generating a pressure, a damper spring (34) for generating a reaction force after the brake pedal is depressed by a predetermined stroke, a first member (31) interlocking with the brake pedal, and a piston And a second member (32) for holding a damper spring between the first member and the damper member. The first member and the second member are provided with protrusions (316, 328) projecting toward the damper spring, and the brake pedal is stepped over a predetermined stroke. In the region, the protrusion is configured to abut against the damper spring to deform the damper spring, thereby generating a reaction force on the damper spring.

  According to this, since the damper spring is formed of a metal or resin that does not easily sag, a good braking operation feeling can be obtained over a long period of time.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a figure which shows the structure of the brake device which concerns on 1st Embodiment of this invention. It is a front view of the cylinder of FIG. FIG. 3 is a plan view of FIG. 2. FIG. 3 is a right side view of FIG. 2. It is a front view of the shaft of FIG. FIG. 6 is a plan view of FIG. 5. FIG. 6 is a right side view of FIG. 5. It is a perspective view of the shaft of FIG. It is a figure which shows the operating state of the brake device which concerns on 1st Embodiment when a brake pedal is an initial position. It is a figure which shows the operating state of the brake device which concerns on 1st Embodiment when a brake pedal is a 1st intermediate position. It is a figure which shows the operating state of the brake device which concerns on 1st Embodiment in the area | region where the brake pedal exceeded the 2nd intermediate position. It is a characteristic view which shows the relationship between the stroke of a brake pedal and the load in the brake device which concerns on 1st Embodiment. It is a figure which shows the principal part structure of the brake device which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described.

  The brake device of the present embodiment is used as a hydraulic brake device in a vehicle brake device that performs cooperative control using a hydraulic brake device that generates a hydraulic braking force and a regenerative braking device that generates a regenerative braking force. .

  As shown in FIG. 1, the hydraulic brake device includes a stroke simulator 3 that generates a reaction force between a brake pedal 1 that is operated by a driver and a master cylinder 2 that generates brake hydraulic pressure. Yes. The brake pedal 1 and the stroke simulator 3 are coupled by a pin 4.

  The operating force input to the brake pedal 1 is transmitted to the master cylinder 2 via the stroke simulator 3. Note that the brake pedal 1 and the stroke simulator 3 are disposed in the vehicle compartment, and the master cylinder 2 is disposed in the engine room.

  The master cylinder 2 is a tandem type master cylinder partitioned into a primary chamber 23 and a secondary chamber 24 by a primary piston 21 and a secondary piston 22. A push rod 25 connected to the stroke simulator 3 is fixed to the primary piston 21.

  A primary spring 26 that urges the primary piston 21 toward the push rod 25 is disposed in the primary chamber 23. A secondary spring 27 that urges the secondary piston 22 toward the primary chamber 23 is disposed in the secondary chamber 24. The primary chamber 23 and the secondary chamber 24 are connected to a reservoir 28 that stores brake fluid.

  When the driver depresses the brake pedal 1, the primary piston 21 is driven via the stroke simulator 3 and brake fluid is sent out from the primary chamber 23, and the secondary piston 22 is driven and brake fluid from the secondary chamber 24. Will be sent out.

  The brake fluid sent from the primary chamber 23 and the secondary chamber 24 flows into each wheel cylinder (not shown) via a brake fluid pressure control actuator (not shown).

  The stroke simulator 3 includes a cylinder 31, a shaft 32, a simulator spring 33, and a damper spring 34.

  The simulator spring 33 serving as the first reaction force generator is a metal compression coil spring and is disposed on the outer peripheral side of the cylinder 31 and the shaft 32. The set load of the simulator spring 33 is set smaller than the set load of the primary spring 26 and the secondary spring 27.

  The damper spring 34 is a disk-shaped member having a through hole in the center of the plate material, and is disposed on the outer peripheral side of the shaft 32. The damper spring 34 is made of a metal such as a spring material or a resin such as PBT (polybutylene terephthalate), and generates a reaction force by bending deformation.

  As shown in FIGS. 1 to 4, the cylinder 31 as the first member includes a cylindrical cylinder first cylindrical portion 311 and a cylindrical cylinder second having a smaller outer diameter than the cylinder first cylindrical portion 311. A cylindrical portion 312 is formed in series.

  A cylinder first hole 313 is formed in the cylinder first cylindrical portion 311 and the cylinder second cylindrical portion 312 so as to extend along the cylinder axial direction. The shaft 32 is slidably inserted into the cylinder first hole 313.

  The cylinder 31 is formed with a cylinder groove 314 extending along the cylinder axial direction from the end of the cylinder first cylindrical portion 311 to the middle of the cylinder second cylindrical portion 312. The cylinder groove 314 is formed at two places in the vertical direction. Then, the intermediate portion of the brake pedal 1 is inserted into the cylinder groove 314.

  A cylinder second hole 315 extending in the cylinder radial direction and penetrating therethrough is formed in the vicinity of the end of the cylinder first cylindrical portion 311. The cylinder second holes 315 are formed at two places in the horizontal direction. Then, the pin 4 is inserted and fixed in the cylinder second hole 315.

  Cylinder projections 316 projecting toward the damper spring 34 and cylinder recesses 317 recessed in a direction away from the damper spring 34 are alternately provided along the circumferential direction at the end of the second cylinder portion 312. Individually formed.

  As shown in FIGS. 1 and 5 to 8, the shaft 32 as the second member supports a disk-shaped shaft flange 321 that supports one end of the simulator spring 33 and the inner peripheral side of the simulator spring 33. A cylindrical spring guide portion 322 and a cylindrical shaft shaft portion 323 that is slidably inserted into the cylinder first hole 313 are formed in series.

  A shaft hole 324 and a shaft female thread portion 325 extending along the shaft axial direction are formed in the shaft flange portion 321, the spring guide portion 322, and the shaft shaft portion 323. Then, one end of the push rod 25 is inserted into the shaft hole 324, and the tip of the push rod 25 is screwed into the shaft female screw portion 325.

  The shaft shaft portion 323 is formed with a shaft groove 326 that extends along the shaft shaft direction from the end of the shaft shaft portion 323 to the middle of the shaft shaft portion 323 and extends in the vertical direction. Then, the intermediate portion of the brake pedal 1 is inserted into the shaft groove 326. A damper spring 34 is disposed on the outer peripheral side of the shaft shaft portion 323.

  Near the end of the shaft shaft portion 323, a shaft long hole 327 that penetrates in the shaft radial direction and is elongated in the shaft axial direction is formed. The long shaft holes 327 are formed at two locations in the horizontal direction. The pin 4 is slidably inserted into the shaft long hole 327.

  Two shaft projections 328 that protrude toward the damper spring 34 and two shaft recesses 329 that are recessed away from the damper spring 34 are formed at the end of the spring guide portion 322 along the circumferential direction. Has been.

  As shown in FIG. 1, in the stroke simulator 3, the shaft shaft portion 323 is slidably inserted into the cylinder first hole 313, and the simulator spring 33 is sandwiched between the cylinder first cylindrical portion 311 and the shaft flange portion 321. Has been.

  The damper spring 34 is disposed on the outer peripheral side of the shaft shaft portion 323 and between the end portion of the cylinder second cylindrical portion 312 and the end portion of the spring guide portion 322.

  The cylinder 31 and the shaft 32 are urged in a direction in which they are separated by the simulator spring 33. When the brake pedal 1 is in the initial position where the brake pedal 1 is not depressed, as shown in FIG. One of the cylinder protruding portion 316 and the shaft protruding portion 328 is in contact, or none is in contact.

  An intermediate portion of the brake pedal 1 is slidably inserted into the cylinder groove 314 and the shaft groove 326, and an intermediate portion of the pin 4 is formed in a hole (not shown) formed in the intermediate portion of the brake pedal 1 and the shaft long hole 327. The both ends of the pin 4 are inserted and fixed in the cylinder second hole 315. As a result, the brake pedal 1 and the cylinder 31 operate integrally, and the shaft 32 can move relative to the brake pedal 1 and the cylinder 31 in the shaft axial direction.

  The front end of the push rod 25 is screwed into the shaft female thread portion 325 so that the primary piston 21, the push rod 25, and the shaft 32 operate integrally.

  In the above configuration, when the brake pedal 1 is depressed, the brake pedal 1 and the cylinder 31 move forward. Here, the pin 4 is inserted into the shaft long hole 327 so that the shaft 32 can be moved relative to the brake pedal 1 and the cylinder 31 in the shaft axis direction, and the set load of the simulator spring 33 is Since the primary spring 26 and the secondary spring 27 are set to be smaller than the set load, the shaft 32 does not move in a region where the amount of depression of the brake pedal 1 is small.

  While the brake pedal 1 is operated from the initial position S0 (the state shown in FIG. 9) to the first intermediate position S1 (the state shown in FIG. 10), the cylinder protrusion 316 and the shaft protrusion 328 are placed on the damper spring 34. One of them abuts or none abuts.

  Therefore, in a predetermined stroke range from the initial position S0 of the brake pedal 1 to the first intermediate position S1, the brake pedal 1 and the cylinder 31 move forward while compressing the simulator spring 33, and the simulator spring 33 increases the stroke of the brake pedal 1. Absorbs and generates reaction force. That is, as shown in FIG. 12, in the predetermined stroke range from the initial position S0 of the brake pedal 1 to the first intermediate position S1, only the simulator spring 33 generates a reaction force, and the reaction force gradually increases.

  Further, while the brake pedal 1 is operated beyond the first intermediate position S1 to the second intermediate position S2, both the cylinder protrusion 316 and the shaft protrusion 328 abut against the damper spring 34.

  Therefore, while the brake pedal 1 is operated beyond the first intermediate position S1 to the second intermediate position S2, the brake pedal 1 and the cylinder 31 move forward while compressing the simulator spring 33 and bending the damper spring 34. The simulator spring 33 and the damper spring 34 absorb the stroke of the brake pedal 1 and generate a reaction force. That is, as shown in FIG. 12, while the brake pedal 1 is operated beyond the first intermediate position S1 to the second intermediate position S2, both the simulator spring 33 and the damper spring 34 generate a reaction force, and the reaction force Increases slightly more rapidly and smoothly than the range from the initial position S0 to the first intermediate position S1.

  As described above, a reaction force is generated in the simulator spring 33 when the brake pedal 1 is initially depressed, and a reaction force is also generated in the damper spring 34 while the brake pedal 1 is being depressed, thereby smoothly changing the reaction force. A good braking operation feeling can be obtained. Further, the damper spring 34 is provided with a through hole in the central portion of the plate material, and therefore can be more easily deformed than a damper spring 34 that is not provided with a through hole.

  Further, in the region where the brake pedal 1 is operated beyond the second intermediate position S2, as shown in FIG. 11, the cylinder protrusion 316, the cylinder recess 317, the shaft protrusion 328, and the shaft recess 329 are provided with a damper. Adheres closely to the spring 34.

  Therefore, in a region where the brake pedal 1 is operated beyond the second intermediate position S2, the cylinder 31 and the shaft 32 move integrally, and the master cylinder 2 generates brake fluid pressure in conjunction with the brake pedal 1. Specifically, in the master cylinder 2, the primary piston 21 is driven via the shaft 32 as the brake pedal 1 is depressed to increase the pressure in the primary chamber 23, and the secondary piston 22 is driven in the secondary chamber. Increase the pressure of 24.

  Thus, in this embodiment, since the damper spring 34 is formed of a metal or a resin that does not easily sag, a good braking operation feeling can be obtained over a long period of time.

  Further, since the operation force input to the brake pedal 1 is transmitted to the master cylinder 2 via the stroke simulator 3, the stroke simulator 3 can be disposed in the vehicle interior, and the brake device including the stroke simulator 3 is provided. Can be improved. More specifically, the stroke simulator 3 can be implemented only by replacing the existing component part, precvis.

  Furthermore, since the conventional brake device needs to adapt the master cylinder depending on the presence or absence of the stroke simulator, the master cylinder of the brake device using the stroke simulator and the master cylinder of the brake device not using the stroke simulator may be shared. could not.

  On the other hand, in the present embodiment, since the operation force input to the brake pedal 1 is transmitted to the master cylinder 2 via the stroke simulator 3, the master cylinder 2 is turned on regardless of the presence or absence of the stroke simulator 3. Can be shared.

(Second Embodiment)
A second embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

  As shown in FIG. 13, in the stroke simulator 3, components other than the simulator spring 33 are arranged in the master cylinder 2. Although not shown, the simulator spring 33 is disposed between the master cylinder 2 and the brake pedal 1 (not shown).

  The cylinder 31 is formed in a bottomed cylindrical shape. Two cylinder projections 316 and two cylinder depressions 317 are alternately formed on the bottom of the cylinder 31 along the circumferential direction. The cylinder 31 is driven toward the primary piston 21 via the push rod 25 when the brake pedal 1 is depressed.

  The shaft 32 is formed in a bottomed cylindrical shape, is disposed between the cylinder 31 and the primary piston 21, and a part of the shaft 32 is slidably inserted into the cylinder first hole 313. Two shaft protrusions 328 and two shaft depressions 329 are alternately formed at the end of the shaft 32 along the circumferential direction.

  The damper spring 34 is disposed in the cylinder first hole 313 and between the bottom of the cylinder 31 and the end of the shaft 32.

  In the above configuration, the push rod 25 is not in contact with the cylinder 31 while the brake pedal 1 is operated from the initial position S0 (state shown in FIG. 13) to the first intermediate position S1.

  Therefore, in the predetermined stroke range from the initial position S0 of the brake pedal 1 to the first intermediate position S1, only the simulator spring 33 generates a reaction force, and the reaction force gradually increases.

  Further, while the brake pedal 1 is operated beyond the first intermediate position S1 to the second intermediate position S2, the push rod 25 and the cylinder 31 are in contact with each other, the primary piston 21 and the shaft 32 are in contact with each other, and further, a damper spring 34 is provided. Both the cylinder protrusion 316 and the shaft protrusion 328 abut.

  Therefore, while the brake pedal 1 is operated beyond the first intermediate position S1 to the second intermediate position S2, the brake pedal 1 and the cylinder 31 move forward while compressing the simulator spring 33 and bending the damper spring 34. . That is, both the simulator spring 33 and the damper spring 34 generate a reaction force, and the reaction force increases slightly more rapidly and smoothly than the range from the initial position S0 to the first intermediate position S1.

  Further, in the region where the brake pedal 1 is operated beyond the second intermediate position S2, the cylinder protrusion 316, the cylinder recess 317, the shaft protrusion 328, and the shaft recess 329 are in close contact with the damper spring 34.

  Therefore, in a region where the brake pedal 1 is operated beyond the second intermediate position S2, the cylinder 31 and the shaft 32 move integrally, and the master cylinder 2 generates brake fluid pressure in conjunction with the brake pedal 1. Specifically, in the master cylinder 2, the primary piston 21 is driven via the shaft 32 as the brake pedal 1 is depressed to increase the pressure in the primary chamber 23, and the secondary piston 22 is driven in the secondary chamber. Increase the pressure of 24.

  Thus, in this embodiment, since the damper spring 34 is formed of a metal or a resin that does not easily sag, a good braking operation feeling can be obtained over a long period of time.

(Other embodiments)
In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

  Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

1 Brake Pedal 2 Master Cylinder 3 Stroke Simulator 21 Primary Piston 22 Secondary Piston 31 Cylinder (First Member)
32 Shaft (second member)
33 Simulator spring (first reaction force generator)
34 Damper spring 316 Projection 328 Projection

Claims (3)

A brake pedal (1) operated by the driver;
A master cylinder (2) for generating piston hydraulic pressure by driving pistons (21, 22) by operating force input to the brake pedal;
A brake device comprising a stroke simulator (3) that absorbs a stroke of the brake pedal and generates a reaction force;
The stroke simulator includes a first reaction force generator (33) that generates a reaction force from an initial position of the brake pedal;
A damper spring (34) for generating a reaction force after the brake pedal is depressed for a predetermined stroke;
A first member (31) interlocked with the brake pedal;
A second member (32) that interlocks with the piston and sandwiches the damper spring with the first member;
The damper spring is formed in a plate shape with metal or resin,
The first member and the second member include protrusions (316, 328) protruding toward the damper spring,
In the region where the brake pedal is depressed beyond the predetermined stroke, the protrusion is brought into contact with the damper spring to deform the damper spring, thereby generating a reaction force on the damper spring. Brake device characterized by that.   2. The brake device according to claim 1, wherein the damper spring is a disk having a through hole formed in a central portion. The first member is formed in a cylindrical shape and is coupled to the brake pedal by a pin (4),
In the second member, the shaft portion (323) is inserted into the first member, and the flange portion (321) is located outside the first member, and moves relative to the brake pedal and the first member. The brake device according to claim 1, wherein the brake device is connected to the brake pedal and the first member with the pin in a possible state.

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