Hydraulic adjustment device

Abstract

To provide a hydraulic pressure regulating device that can readily change a brake feeling without any design change in components.SOLUTION: A hydraulic pressure regulating device 1 is installed to a hydraulic pressure brake system that supplies hydraulic pressure of hydraulic fluid to a brake device CA for braking. The hydraulic pressure regulating device includes: a bottomed cylindrical cylinder hole 3 having an opening part 23 at one end and a bottom part at the other end; a piston 5 inserted through the cylinder hole 3; a liquid chamber 9 which is defined by the cylinder hole 3 and the piston 5 and into which the hydraulic fluid flows; and an elastic body 6 for biasing the piston 5 toward the liquid chamber 9.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a hydraulic pressure adjusting device capable of adjusting the hydraulic pressure of brake fluid acting on a braking device.

Background Art

[0002] Patent Document 1 discloses a braking device in which the hydraulic pressure of brake fluid generated by the operation of an operator is transmitted to a braking device. In the braking device of Patent Document 1, the rollback amount of the piston used in the interlocking brake system of the front-wheel disk brake is set smaller than the rollback amount of the piston used in the independent brake system of the front-wheel disk brake. Thereby, the braking device of Patent Document 1 prevents the enlargement of the master cylinder on the interlocking brake system side while maintaining good operation feeling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The braking device of Patent Document 1 has a structure in which the hydraulic pressure of brake fluid generated by the operation of an operator is directly transmitted to a braking device, and does not include a mechanism for changing the brake feeling. In order to change the brake feeling, there is only a method of changing the design (specification change) of the components of the braking device, and there is a problem that it is difficult to change the brake feeling by a simple method.

[0005] An object of the present invention is to provide a hydraulic pressure adjusting device that solves the above-described problems and can easily change the brake feeling without changing the design of components.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a hydraulic pressure adjusting device provided in a hydraulic brake system that supplies the hydraulic pressure of a working fluid to a braking device for braking. The hydraulic pressure adjusting device includes a bottomed cylindrical cylinder hole having an opening at one end and a bottom at the other end, a piston inserted into the cylinder hole, a fluid chamber defined by the cylinder hole and the piston into which the working fluid flows, and an elastic body that biases the piston toward the fluid chamber. The elastic body is a coil spring, and includes a lid member that closes the opening of the cylinder hole, and an adjustment means that forms the bottom of the cylinder hole and adjusts the spring length of the coil spring. The adjustment means includes an adjustment knob that rotates the piston around its axis, and a spring holding portion provided on one of the piston and the lid member that holds one end of the coil spring. A spiral groove portion is formed in the spring holding portion in the same direction as the winding direction of the wire of the coil spring, and one end of the coil spring is wound along the groove portion. Then, by the rotation operation of the adjustment knob, the winding amount of the coil spring with respect to the groove portion is adjusted, thereby changing the contractable spring length of the coil spring.

[0007] In the present invention, when the hydraulic pressure of the working fluid is generated, the piston of the hydraulic pressure adjusting device moves against the biasing force of the elastic body, and a part of the working fluid is accommodated in the fluid chamber by this movement. Thereby, the amount of the working fluid supplied to the braking device is adjusted. Thus, since the present invention has a mechanism capable of adjusting the amount of the working fluid supplied to the braking device, the brake feeling can be easily changed without changing the design of the components. For example, if the hydraulic pressure adjusting device is incorporated into an existing hydraulic brake system, the brake feeling can be changed without changing the specifications of the existing hydraulic brake system. Further, in the hydraulic brake system in which the hydraulic pressure adjusting device is incorporated, the amount of the working fluid supplied to the braking device can be adjusted only by selecting elastic bodies having different elastic coefficients, so that the brake feeling can be easily changed. In addition, in the present invention, since the spring constant of the coil spring can be adjusted by the rotation operation of the adjustment knob, it is easy to change the brake feeling. Also, since the brake feeling can be changed even after the hydraulic pressure adjustment device is mounted on the vehicle, there is no need to replace the coil spring with a different elastic coefficient, etc., and the brake feeling can be changed according to the driver's preference. Also, by inserting the piston and the elastic body into the cylinder hole through the opening and closing the opening with the lid member, the hydraulic pressure adjustment device can be easily assembled.

[0008] To solve the above problems, the present invention is a hydraulic pressure adjustment device provided in a hydraulic brake system that supplies the hydraulic pressure of the working fluid to a braking device to perform braking. The hydraulic pressure adjustment device includes a bottomed cylindrical cylinder hole having an opening at one end and a bottom at the other end, a piston inserted into the cylinder hole, a liquid chamber defined by the cylinder hole and the piston into which the working fluid flows, an elastic body that biases the piston toward the liquid chamber, and at least a lid member that closes the opening of the cylinder hole. By holding the end of the elastic body by the lid member, a length in which the elastic body can contract is ensured to be changeable between the piston and the lid member. In the present invention, when the hydraulic pressure of the working fluid is generated, the piston of the hydraulic pressure adjustment device moves against the biasing force of the elastic body, and a part of the working fluid is accommodated in the liquid chamber by this movement. Thereby, the amount of the working fluid supplied to the braking device is adjusted. Thus, since the present invention is provided with a mechanism capable of adjusting the amount of the working fluid supplied to the braking device, the brake feeling can be easily changed without changing the design of the components. For example, if a hydraulic pressure adjusting device is incorporated into an existing hydraulic brake system, the brake feeling can be changed without changing the specifications of the existing hydraulic brake system. Further, in the hydraulic brake system in a state where the hydraulic pressure adjusting device is incorporated, since the amount of the working fluid supplied to the braking device can be adjusted only by selecting elastic bodies having different elastic coefficients, the brake feeling can be easily changed. Also , open The hydraulic pressure adjusting device can be easily assembled by inserting the piston and the elastic body into the cylinder hole through the mouth portion and closing the opening portion with a lid member.

[0009] Further, it is preferable that the lid member and the elastic body are detachably attached. In this configuration, as elastic bodies with different elastic coefficients, for example, the elastic bodies with different deformation coefficients (spring constants) can be replaced, or the spring length of the coil spring can be changed to change the deformation coefficient (spring constant), so that the amount of working fluid supplied to the braking device can be adjusted. Therefore, the braking feeling can be easily changed even after the hydraulic pressure adjusting device is mounted on the vehicle.

[0010] Further, it is preferable that the elastic body is composed of a metal spring member or a rubber repulsion member. In this configuration, the braking feeling based on the respective characteristics of the metal spring member or the rubber repulsion member can be provided, and the range of change in the braking feeling is widened.

[0013] Further, it is preferable that a stepped portion is formed on the inner surface of the cylinder hole, and the movement of the piston toward the liquid chamber side is restricted by the stepped portion. In this configuration, the initial position of the piston in the cylinder hole can be set with a simple configuration, and the liquid chamber can be set to a desired size. Further, since the configuration is simple, the number of parts and the cost can be reduced.

[0014] Further, it is preferable that the cylinder hole is provided integrally with the hydraulic pressure generating device or the braking device. In this configuration, since the hydraulic pressure adjusting device is integrally provided in the hydraulic pressure generating device or the braking device, the number of parts and the cost can be reduced.

Effects of the Invention

[0015] According to the hydraulic pressure adjusting device of the present invention, the braking feeling can be easily changed without changing the design of the constituent parts.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, when referring to the up, down, left, and right of the hydraulic pressure adjusting device, for convenience, the directions shown in FIG. 1 are used as a reference, but it is not intended to specify the up, down, left, and right of the hydraulic pressure adjusting device with respect to the vehicle. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

[0018] (First Embodiment) The hydraulic pressure adjusting device 1 of the present embodiment is used for vehicles of the bar handle type such as motorcycles, three-wheeled vehicles, and all-terrain vehicles (ATVs).

[0019] As shown in FIG. 1, the hydraulic pressure adjusting device 1 is provided in the middle of a hydraulic pressure path R that connects a master cylinder MC, which is a hydraulic pressure generating device, and a braking device CA, which is a caliper of a disc brake or a wheel cylinder of a drum brake. The hydraulic pressure path R may be a hydraulic brake system for braking the front wheels, a hydraulic brake system for braking the rear wheels, or a brake system for controlling the front and rear wheels in conjunction. The master cylinder MC has a cylinder (not shown). A brake fluid tank chamber for storing brake fluid as the working fluid is connected to the cylinder. Inside the cylinder, a master cylinder piston (not shown) that slides in the axial direction of the cylinder by the operation of a brake operator and discharges the brake fluid into the hydraulic passage R is assembled.

[0020] The hydraulic pressure of the brake fluid generated in the master cylinder MC is transmitted to the hydraulic pressure adjusting device 1 through the hydraulic passage R1 connecting the master cylinder MC and the hydraulic pressure adjusting device 1, and then transmitted to the braking device CA through the hydraulic passage R2 connecting the hydraulic pressure adjusting device 1 and the braking device CA.

[0021] As shown in FIGS. 1 and 2, the hydraulic pressure adjusting device 1 is configured by assembling components inside a base body 2. The base body 2 is, for example, a casting made of an aluminum alloy. Inside the base body 2, a bottomed cylindrical cylinder hole 3 is formed. The axis of the cylinder hole 3 extends in the left-right direction. In this embodiment, the cylinder hole 3 opens to the right surface 24 of the base body 2. Inside the cylinder hole 3, a piston 5 and a metal coil spring 6 as an elastic body are arranged from the left side to the right side in the axial direction (from the bottom side to the opening side of the cylinder hole 3). A liquid chamber 9 on which the hydraulic pressure of the brake fluid from the master cylinder MC acts is formed on the bottom side of the cylinder hole 3. The coil spring 6 is arranged on the opening 23 side of the cylinder hole 3 and biases the piston 5 toward the liquid chamber 9. The opening 23 of the cylinder hole 3 is closed by a lid member 7.

[0022] An inlet port 21 to which the hydraulic passage R1 from the master cylinder MC is connected is formed on the upper part of the base body 2. Also, an outlet port 22 to which the hydraulic passage R2 leading to the braking device CA is connected is formed on the lower part of the base body 2. Inside the base body 2, flow paths 21a and 22a are formed so as to extend in the vertical direction, and the inlet port 21 and the outlet port 22 communicate with the liquid chamber 9 through the flow paths 21a and 22a.

[0023] A cylindrical member 4 is attached to the inner surface of the cylinder hole 3 by press-fitting. A piston 5 is disposed inside the cylindrical member 4. The right end portion of the cylindrical member 4 constitutes a stepped portion 42 perpendicular to the inner surface 3a of the cylinder hole 3.

[0024] The piston 5 includes three flange portions 51 to 53 formed at intervals from the left side to the right side. A cup seal 55 is attached between the left flange portion 51 and the central flange portion 52. The cup seal 55 seals the space between the outer peripheral surface of the piston 5 and the inner peripheral surface of the cylindrical member 4 in a liquid-tight manner, and defines a liquid chamber 9 on the bottom side of the cylinder hole 3. The outer diameters of the left flange portion 51 and the central flange portion 52 are formed smaller than the inner diameter of the cylindrical member 4. The left flange portion 51 and the central flange portion 52 function as stoppers for preventing the cup seal 55 from falling off.

[0025] The right flange portion 53 is a portion that receives the biasing force of the coil spring 6. The right flange portion 53 has an outer diameter larger than the inner diameter of the cylindrical member 4, and abuts against the stepped portion 42 of the cylindrical member 4 under the biasing force of the coil spring 6. By this abutment, the movement of the piston 5 toward the bottom side of the cylinder hole 3 is restricted, and the liquid chamber 9 defined by the cylinder hole 3 and the cup seal 55 is set to a predetermined size. Also, the play of the piston 5 with respect to the cylindrical member 4 is suppressed by the abutment. A protrusion 54 that is inserted inside the left end portion 61 of the coil spring 6 is formed on the right side surface of the right flange portion 53.

[0026] The coil spring 6 is arranged in a compressed state between the flange portion 53 on the right side of the piston 5 and the lid member 7, and has a biasing force such that the flange portion 53 on the right side of the piston 5 can be brought into contact with the stepped portion 42 of the cylindrical member 4 during assembly. On the left portion of the lid member 7, a spring holding portion 81 for holding the right side portion 62 (one end portion) of the coil spring 6 is integrally formed. The spring holding portion 81 has a substantially cylindrical shape protruding toward the coil spring 6. A spiral groove portion 82 in the same direction as the winding direction of the wire of the coil spring 6 is formed on the outer peripheral surface of the spring holding portion 81. The spring holding portion 81 holds the right side portion 62 of the coil spring 6 by winding the right side portion 62 of the coil spring 6 along this groove portion 82. The fixing of the right side portion 62 of the coil spring 6 to the groove portion 82 may be by any method such as welding or caulking.

[0027] Since the right side portion 62 of the coil spring 6 is held by the spring holding portion 81, a spring length L1 in which the coil spring 6 can contract is ensured between the flange portion 53 on the right side of the piston 5 and the left end portion of the spring holding portion 81 as shown in FIG. 1.

[0028] Next, the change in the brake characteristics realized by such a hydraulic pressure adjusting device 1 will be described. When a brake operating element (not shown) is operated, the hydraulic pressure of the brake fluid generated in the master cylinder MC is transmitted to the hydraulic pressure adjusting device 1 through the hydraulic pressure passage R1. The hydraulic pressure of the brake fluid transmitted to the hydraulic pressure adjusting device 1 is transmitted to the liquid chamber 9 through the input port 21 and the flow path 21a of the base body 2. Then, the hydraulic pressure in the liquid chamber 9 increases, and as shown in FIG. 3, the piston 5 moves toward the lid member 7 against the biasing force of the coil spring 6.

[0029] As a result, a part of the brake fluid generated in the master cylinder MC is stored in the liquid chamber 9, and the hydraulic pressure of the brake fluid transmitted from the outlet port 22 to the braking device CA through the hydraulic pressure passage R2 is adjusted.

[0030] FIG. 4 is a graph showing the braking characteristics of the hydraulic pressure adjusting device 1. In FIG. 4, the rising portion indicated by the symbol (a) is due to play or the like until the pistons provided in the braking device CA come into contact with the pads due to the deflection of the components, and is a portion that does not affect the braking characteristics. The dashed-dotted line indicated by the symbol (b) shows the braking characteristics when the hydraulic pressure adjusting device 1 is not installed in the braking system between the master cylinder MC and the braking device CA. That is, the dashed-dotted line (b) is the braking characteristics preset by the components of the master cylinder MC and the braking device CA.

[0031] On the other hand, the solid line indicated by the symbol (c) shows the braking characteristics of the present embodiment in which the hydraulic pressure adjusting device 1 is installed in the braking system between the master cylinder MC and the braking device CA. The solid line (c) has a larger slope showing the relationship between the hydraulic pressure and the amount of the brake fluid than the dashed-dotted line (b) when the hydraulic pressure adjusting device 1 is not installed, and has a braking characteristic in which a larger amount of the brake fluid is required for the increase in the hydraulic pressure of the brake fluid. As a result, the braking characteristics of the solid line (c) are changed in the direction of softer braking feeling compared to the braking characteristics indicated by the dashed-dotted line (b).

[0032] Next, the braking characteristics when the coil springs 6 with different spring constants are assembled to the hydraulic pressure adjusting device 1 will be described. In FIG. 4, the broken line indicated by the symbol (d) is the braking characteristic when the coil spring 6 having a smaller spring constant than the coil spring 6 used for the solid line (c) is assembled to the hydraulic pressure adjusting device 1. In this case, by using the coil spring 6 having a smaller spring constant, the braking feeling is changed in the direction of being softer compared to the braking characteristics indicated by the solid line (c).

[0033] On the one hand, the two-dot chain line marked with symbol (B) represents the braking characteristics when a coil spring 6 with a spring constant larger than that of the coil spring 6 used in the solid line (A) is assembled to the hydraulic pressure adjusting device 1. In this case, by using the coil spring 6 with a large spring constant, the braking feeling is changed in the direction of being harder compared to the braking characteristics shown by the solid line (A). That is, by assembling coil springs 6 with different spring constants, the braking feeling can be changed in both the softer direction and the harder direction compared to the braking characteristics shown by the solid line (A).

[0034] According to the hydraulic pressure adjusting device 1 of the present embodiment described above, when the hydraulic pressure of the brake fluid is generated in the master cylinder MC, the piston 5 moves against the biasing force of the coil spring 6, and a part of the brake fluid is accommodated in the liquid chamber 9 by this movement. Thereby, the amount of the brake fluid supplied to the braking device CA is adjusted. In this way, since it is provided with a mechanism capable of adjusting the amount of the brake fluid supplied to the braking device CA, the braking feeling can be easily changed without changing the design of the components of the master cylinder MC and the braking device CA. For example, if the hydraulic pressure adjusting device 1 is incorporated into an existing hydraulic brake system, the braking feeling can be changed without changing the specifications of the existing hydraulic brake system. Also, in the hydraulic brake system in a state where the hydraulic pressure adjusting device 1 is incorporated, by simply selecting coil springs 6 with different elastic coefficients, the amount of the brake fluid supplied to the braking device CA can be adjusted, so that the braking feeling can be easily changed.

[0035] Moreover, since it is provided with a lid member 7 that closes the opening 23 of the cylinder hole 3, the hydraulic pressure adjusting device 1 can be easily assembled by inserting the piston 5 and the coil spring 6 into the cylinder hole 3 through the opening 23 and closing the opening 23 with the lid member 7.

[0036] Also, since the movement of the piston 5 toward the liquid chamber 9 side is restricted by the stepped portion 42, the initial position of the piston 5 in the cylinder hole 3 can be set with a simple configuration, and the liquid chamber 9 can be set to a desired size.

[0037] (Second Embodiment) The hydraulic pressure adjustment device of the second embodiment will be described with reference to FIGS. 5 to 8. The difference between this embodiment and the first embodiment is that it is provided with an adjustment means 70 for adjusting the spring length of the coil spring 6.

[0038] As shown in FIGS. 5 and 6, the hydraulic pressure adjustment device 1A of this embodiment has a cylinder hole 3 different from that of the first embodiment. The cylinder hole 3 has an inner surface presenting a stepped cylindrical shape, and includes a large-diameter portion 31 continuous with the right opening 23 and a small-diameter portion 32 continuous with the large-diameter portion 31. A stepped portion 33 is formed between the large-diameter portion 31 and the small-diameter portion 32.

[0039] An opening hole 35 is formed in the left surface 27 of the base body 2, and the left end of the small-diameter portion 32 opens at the bottom of the opening hole 35. An adjustment knob 71, which will be described later for the adjustment means 70, is disposed in the opening hole 35. A body portion 72, which will be described later for the adjustment knob 71, is inserted into the small-diameter portion 32 through the opening hole 35. The body portion 72 closes the left end of the small-diameter portion 32 and forms the bottom of the cylinder hole 3.

[0040] Inside the large-diameter portion 31, the flange portion 53 on the right side of the piston 5, the protrusion 54, the coil spring 6, and the spring holding portion 81 are disposed. The flange portion 53 on the right side of the piston 5 abuts against the stepped portion 33 by the biasing force of the coil spring 6. The left end portion 61 of the coil spring 6 is fixed to the right side surface of the right flange portion 53 by a joining means such as welding or caulking.

[0041] On the other hand, the right portion 62 of the coil spring 6 is not fixed to the groove portion 82 of the spring holding portion 81, and the winding amount along the groove portion 82 is adjustable. Thus, when the piston 5 is rotated around the axis of the cylinder hole 3, the coil spring 6 rotates integrally with the piston 5, and the winding amount of the right portion 62 with respect to the groove portion 82 of the spring holding portion 81 is adjusted in the rotation direction.

[0042] The left end portion 56 of the piston 5 protrudes toward the inside of the liquid chamber 9 and has a semi-cylindrical shape with an engagement groove 57 along the axis of the cylinder hole 3.

[0043] The adjusting means 70 includes an adjusting knob 71 rotatable around the axis of the cylinder hole 3, a ratchet mechanism 74 for holding the rotational position of the adjusting knob 71, a retaining ring 77 for holding the adjusting knob 71 in the opening hole 35 of the base body 2, and an engagement groove 57 provided in the piston 5. The adjusting knob 71 includes a knob portion 71a, a knob flange portion 71b, a body portion 72, and an engagement projection 78.

[0044] The knob portion 71a has a cylindrical shape with a size that is easy to grip with fingers. The knob flange portion 71b is formed continuously with the knob portion 71a and has a disc shape that can be inserted into the opening hole 35 of the base body 2. The body portion 72 is formed at the center of the right side surface of the knob flange portion 71b and has a cylindrical shape. The body portion 72 is a portion disposed inside the small-diameter portion 32. A circumferential groove 73 is formed on the outer peripheral surface of the body portion 72. An O-ring 73a as a sealing member is mounted in the circumferential groove 73. The O-ring 73a is in close contact with the inner surface of the small-diameter portion 32 and seals the space between the body portion 72 (adjusting knob 71) and the small-diameter portion 32 in a liquid-tight manner.

[0045] The engagement projection 78 has a flat plate shape extending rightward from the center of the right side surface of the body portion 72. The engagement projection 78 engages with the engagement groove 57 of the left end portion 56 of the piston 5. The engagement projection 78 and the engagement groove 57 constitute a connection structure for connecting the adjusting knob 71 to the piston 5. With this connection structure, the piston 5 rotates in conjunction with the rotation of the adjusting knob 71, and the movement of the piston 5 in the axial direction is allowed while maintaining the connection state between the adjusting knob 71 and the piston 5 (see FIGS. 7(a) and (b)).

[0046] The ratchet mechanism 74 includes a spring 75 and a ball member 76. The ball member 76 is elastically engaged with a recess (not shown) formed on the right side surface of the knob flange portion 71b by the biasing force of the spring 75. The adjustment knob 71 is positioned by the engagement of the ball member 76. Preferably, a number of recesses are formed in the circumferential direction. The more the number of formed recesses is, the finer the adjustment of the spring constant of the coil spring 6 can be performed. Note that the ball member 76 makes a sound when engaging with the recess and gives a click feeling to the rotation operation of the adjustment knob 71. Such a spring 75 and ball member 76 are accommodated in a housing hole 34 formed on the bottom surface of the opening hole 35.

[0047] The retaining ring 77 is engaged with an inner circumferential groove 35a formed on the inner circumferential surface of the opening hole 35 and abuts against the left side surface of the knob flange portion 71b. By this abutment of the retaining ring 77, the adjustment knob 71 is retained against removal.

[0048] Next, a method for adjusting the spring length of the coil spring 6 realized by the operation of the adjusting means 70 will be described. When adjusting the spring length, as shown in Fig. 7(a), the adjustment knob 71 of the adjusting means 70 is rotated by a finger.

[0049] For example, as shown in Fig. 5, in the initial state where the flange portion 53 on the right side of the piston 5 abuts against the stepped portion 33 of the cylinder hole 3, when the knob portion 71a of the adjustment knob 71 is rotated in the clockwise direction, the rotational force is transmitted from the engaging protrusion 78 of the adjustment knob 71 to the engaging groove 57 of the piston 5, and the piston 5 and the coil spring 6 rotate integrally in the clockwise direction.

[0050] By this rotation, as shown in Fig. 8, the right side portion 62 of the coil spring 6 moves toward the lid member 7 along the groove portion 82 of the spring retaining portion 81, and the amount of winding of the coil spring 6 around the spring retaining portion 81 changes. Thereby, the spring length of the coil spring 6 is set to a spring length L2 shorter than the initial state, and the load (spring constant) of the coil spring 6 becomes larger compared to before the rotation operation (initial state). Note that the piston 5 and the coil spring 6 move integrally toward the lid member 7 side as the winding amount of the coil spring 6 changes (see Fig. 7(b)).

[0051] According to the hydraulic pressure adjusting device 1A of the present embodiment, the spring constant of the coil spring 6 can be adjusted by rotating the adjustment knob 71, so that the brake feeling can be easily changed. Further, since the brake feeling can be changed even after the hydraulic pressure adjusting device 1A is installed, there is no need to replace the coil spring 6 with a different elastic coefficient, and it is also easy to change the brake feeling according to the driver's preference.

[0052] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist thereof. In the first embodiment, the lid member 7 is attached to the opening 23 by press-fitting, but the present invention is not limited thereto, and the lid member 7 may be configured to be detachable (attachable and detachable) with respect to the opening 23. By configuring in this way, it is possible to easily replace the coil spring 6 with a different load (spring constant), and it is possible to easily change the brake feeling.

[0053] Further, in the first embodiment, the coil spring 6 is used as the elastic body, but the present invention is not limited thereto, and a metal spring member (for example, a leaf spring) or a rubber repulsion member may be used as the elastic body. By configuring in this way, it is possible to provide a brake feeling based on the characteristics of the metal spring member or the rubber repulsion member, and the range of change of the brake feeling is widened.

[0054] Further, in the first and second embodiments, the hydraulic pressure adjusting devices 1 and 1A are arranged in the hydraulic pressure path R from the master cylinder MC to the brake device CA, but the present invention is not limited thereto, and the hydraulic pressure adjusting devices 1 and 1A may be provided integrally with the master cylinder MC or the brake device CA. By configuring in this way, since the hydraulic pressure adjusting devices 1 and 1A are integrally provided in the master cylinder MC or the braking device CA, the number of components and the cost can be reduced.

[0055] Also, in the first embodiment, the coil spring 6 is installed such that the flange portion 53 on the right side of the piston 5 has a biasing force that can abut against the stepped portion 42 of the cylindrical member 4, but the present invention is not limited thereto, and it may be configured to abut more strongly. Note that the magnitude of the abutting force against the stepped portion 42 can be set as appropriate.

[0056] Also, in the first embodiment, the spring holding portion 81 is provided on the lid member 7 to hold the coil spring 6 on the lid member 7 side, but conversely, a spring holding portion may be provided on the protrusion 54 of the piston 5 to hold the coil spring 6. Further, the coil spring 6 may be held on both the piston 5 and the lid member 7. Furthermore, the coil spring 6 does not necessarily need to be held (fixed) to the piston 5 or the lid member 7, and it may be any that is disposed in a compressed state between the piston 5 and the lid member 7 during assembly.

[0057] Also, in the first embodiment, the piston 5 and the coil spring 6 are arranged from the bottom side of the cylinder hole 3 toward the opening 23 side, but the present invention is not limited thereto, and each component may be arranged in the reverse left - right direction, that is, from the opening 23 side of the cylinder hole 3 toward the bottom side, with the piston 5 and the coil spring 6 arranged.

[0058] Also, in the second embodiment, the spring holding portion 81 is provided on the lid member 7, but the present invention is not limited thereto, and a spring holding portion may be provided on the protrusion 54 of the piston 5. In this case, by fixing the right end portion of the coil spring 6 to the lid member 7 and providing a groove portion 82 in the spring holding portion of the piston 5, the same operational effects can be obtained. Also, in the first embodiment, it is not necessarily required to provide the spring holding portion 81 having the groove portion 82, and the coil spring 6 may be held by appropriate means.

[0059] In the second embodiment, a connection structure in which the engaging protrusion 78 of the adjustment knob 71 engages with the engaging groove 57 of the piston 5 has been shown. However, the present invention is not limited to this, and any structure can be adopted as long as the piston 5 rotates when the adjustment knob 71 rotates and the axial movement of the piston 5 is allowed while maintaining the connected state.

Explanation of Reference Numerals

[0060] 1 Hydraulic adjustment device 1A Hydraulic adjustment device 3 Cylinder hole 4 Cylindrical member 5 Piston 6 Coil spring (elastic body) 7 Cover member 9 Liquid chamber 31 Large-diameter portion (cylinder hole) 32 Small-diameter portion (cylinder hole) 33 Step portion 42 Step portion 62 Right-side portion (one end of coil spring) 70 Adjusting means 71 Adjustment knob 81 Spring holding portion 82 Groove portion CA Braking device L1 Spring length L2 Spring length MC Master cylinder

Claims

1. A hydraulic pressure adjusting device provided in a hydraulic brake system that supplies the hydraulic pressure of a working fluid to a braking device to perform braking, a bottomed cylindrical cylinder hole having an opening at one end and a bottom at the other end, a piston inserted into the cylinder hole, a fluid chamber defined by the cylinder hole and the piston, into which the working fluid flows, and an elastic body that biases the piston toward the fluid chamber, wherein the elastic body is a coil spring, a lid member that closes the opening of the cylinder hole, and adjustment means that forms the bottom of the cylinder hole and adjusts the spring length of the coil spring, wherein the adjustment means includes an adjustment knob that rotates the piston around its axis, and a spring holding portion provided on one of the piston and the lid member that holds one end of the coil spring, wherein a spiral groove portion in the same direction as the winding direction of the wire of the coil spring is formed in the spring holding portion, and one end of the coil spring is wound along the groove portion, and the contractible spring length of the coil spring is changed by adjusting the winding amount of the coil spring with respect to the groove portion by the rotation operation of the adjustment knob. A hydraulic pressure adjusting device characterized by this.

2. A hydraulic pressure adjusting device provided in a hydraulic brake system that supplies the hydraulic pressure of a working fluid to a braking device to perform braking, a bottomed cylindrical cylinder hole having an opening at one end and a bottom at the other end, a piston inserted into the cylinder hole, a fluid chamber defined by the cylinder hole and the piston, into which the working fluid flows, and an elastic body that biases the piston toward the fluid chamber, and includes at least a lid member that closes the opening of the cylinder hole, wherein the length that the elastic body can contract is ensured to be changeable between the piston and the lid member by holding the end portion of the elastic body by the lid member. A hydraulic pressure adjusting device characterized by this.

3. The hydraulic pressure adjusting device according to claim 1 or claim 2, characterized in that the lid member and the elastic body are detachably attached.

4. The hydraulic pressure adjusting device according to claim 2, characterized in that the elastic body is composed of a metal spring member or a rubber repelling member.

5. A step portion is formed on the inner surface of the cylinder hole, and the piston is restricted from moving toward the fluid chamber side by the step portion. The hydraulic pressure adjusting device according to any one of claims 1 to 4.

6. The hydraulic pressure adjusting device according to any one of claims 1 to 5, wherein the cylinder hole is provided integrally with the hydraulic pressure generating device or the braking device.

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