JP5086866B2 - Reservoir for vehicle brake hydraulic pressure control device - Google Patents

Description

  The present invention relates to a reservoir for a vehicle brake hydraulic pressure control device.

  For example, Patent Document 1 discloses a conventional reservoir for a vehicle brake hydraulic pressure control device. In this reservoir, the opening end of the cylinder hole is sealed and the gas spring action of the gas chamber is used to prevent the intrusion of foreign matter and to reduce the size of the compression coil spring, thereby reducing the size of the reservoir body. ing.

Japanese Patent No. 3676264

  However, since the reservoir of the vehicle brake hydraulic pressure control device disclosed in Patent Document 1 contains the compression coil spring inside, the storage space is required, but this storage space reduces the size of the reservoir. It inhibits.

  From such a viewpoint, an object of the present invention is to provide a reservoir for a vehicle brake hydraulic pressure control device that can be reduced in size.

The invention according to claim 1 which solves such a problem is a reservoir used in a vehicle brake hydraulic pressure control device and having a hydraulic pressure chamber for temporarily storing brake fluid during wheel brake pressure reduction control. A cylinder hole with a bottom formed in the base of the brake fluid pressure control device, where the communication path of the brake fluid opens to the bottom side, a plug provided at the opening end of the cylinder hole, and an axial movement within the cylinder hole A piston that can be provided and divides the cylinder hole into a hydraulic chamber on the communication path side and a gas chamber on the plug side, and the piston is formed in an accommodation groove formed on an inner peripheral surface of the cylinder hole. The cylinder is located on the plug side of the housing groove and contains an elastic seal member having a rectangular cross section that abuts the outer peripheral surface of the housing and partitions the fluid pressure chamber side and the gas chamber side in a sealed state A tapered surface is formed on the inner peripheral surface of the hole to increase the inner peripheral diameter toward the bottom side of the cylinder hole, and the elastic seal member is elastically deformed to the tapered surface side. allowing movement to the plug side of said piston, said piston to return to the position by a restoring force, the plug is provided with a restricting surface for restricting movement of the piston by contact with the piston, The reservoir of a vehicular brake hydraulic pressure control device, wherein the elastic seal member is elastically deformed while maintaining a pressure-bonded state to the piston even when the piston abuts on the regulating surface .

According to the reservoir having such a configuration, the elastic seal member is allowed to move toward the plug side by elastic deformation toward the tapered surface side, and the piston is returned to a fixed position by a restoring force. The compression coil spring which required space can be abolished or reduced in size. As a result, the axial length of the piston can be reduced, and the reservoir can be downsized, and thus the vehicle brake hydraulic pressure control device can be downsized. Further, since the elastic seal member has a rectangular cross section, it is easy to cause elastic deformation around the corner portion, and a large restoring force can be obtained by rollback. The elastic deformation of the elastic sealing member is shaped like the result determination of the tapered surface.

  Furthermore, in the invention according to claim 2, the plug is configured to partition the inside and outside of the cylinder hole in a sealed state, and the piston is positioned at a fixed position with respect to the restoring force of the compressed gas in the gas chamber. The reservoir for a vehicle brake hydraulic pressure control device according to claim 1, wherein the reservoir is used as a part of a force for returning to the vehicle.

  According to the reservoir with such a configuration, the restoring force of the gas in the compressed gas chamber with the gas chamber sealed is used as an air spring, and as a part of the force for returning the piston to a fixed position, thereby restoring the restoring force. Even when a small elastic seal member is used, the piston can be reliably returned to the home position.

  According to the present invention, it is possible to reduce the size of the reservoir and the vehicle brake hydraulic pressure control device, and to reduce the manufacturing cost of the vehicle brake hydraulic pressure control device.

  Hereinafter, the best first embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings. The reservoir according to the present embodiment is provided, for example, in a vehicle brake hydraulic pressure control device for a motorcycle.

  As shown in FIG. 1, the vehicle brake hydraulic pressure control device U includes a base 1, a normally open type electromagnetic valve 2, a normally closed type electromagnetic valve 3, a reservoir 4, a pump 5, and a motor 6. And an electronic control unit 7 and a control housing 8. The control housing 8 is assembled to the front surface 1a of the base 1 and accommodates the electronic control unit 7 therein. The motor 6 is assembled to the rear surface (not shown) of the base 1.

  The base body 1 is a member made of an aluminum alloy that has a substantially rectangular parallelepiped shape, and includes a flow path of a brake fluid that is a fluid. The base body 1 is formed with a reservoir hole (hereinafter sometimes referred to as a “cylinder hole”) 14 constituting a part of the reservoir 4 so as to open to the front surface 1a. , Holes 12 and 13 in which the normally closed solenoid valve 3 and the like are mounted, an inlet port 11a to which a pipe (not shown) leading to a master cylinder (not shown) is connected and a wheel brake (not shown) are shown. An outlet port 11b and the like to which a pipe is connected are formed. The inlet port 11a, the outlet port 11b, and the holes 12, 13, and 14 communicate with each other directly or through a flow path (not shown) formed inside the base body 1.

  The reservoir 4 is released through the communication path 21 (see FIG. 2) connected to the flow path in the base body 1 by opening the electromagnetic valve 3 that directly communicates with the outlet port 11b during the pressure reduction control of the wheel brake. The brake fluid (that is, the brake fluid flowing out from the wheel cylinder (not shown)) is temporarily stored.

  As shown in FIG. 2A, the reservoir 4 according to the first embodiment is a bottomed cylinder that is formed in the base body 1 and has a brake fluid communication path 21 that opens to the bottom side (the bottom in this embodiment). A hole (reservoir hole) 14, a plug 31 provided at the open end of the cylinder hole 14, a cylinder hole 14 is provided so as to be movable in the axial direction, and the cylinder hole 14 is connected to the fluid pressure on the communication passage 21 side. A piston 41 partitioned into a chamber 22 and a gas chamber 23 on the plug 31 side, and a C-shaped clip member 24 for fixing the plug 31 in the cylinder hole 14 are provided. The bottom side of the cylinder hole 14 includes the bottom and the side surface near the bottom. In the present embodiment, the communication path 21 is formed to open at the bottom of the cylinder hole 14, but is not limited thereto, and may be formed to open to the side surface near the bottom. Of course. On the inner peripheral surface 14a of the cylinder hole 14, an elastic seal member 51 having a rectangular cross section and an endless shape that abuts the outer peripheral surface 41a of the piston 41 and partitions the hydraulic chamber 22 side and the gas chamber 23 side in a sealed state. Is attached. The elastic seal member 51 is configured to be elastically deformed to allow the piston 41 to move toward the plug 31 and to return the piston 41 to a fixed position (position shown in FIG. 2A) by a restoring force. ing.

  The cylinder hole 14 is a bottomed cylindrical hole formed in the base body 1 and is formed to open to the front surface 1a side. The opening of the cylinder hole 14 is located at the tip of the cylindrical portion 1 b protruding from the front surface 1 a of the base 1. A communication passage 21 is opened at the bottom of the cylinder hole 14 to communicate with the inside of the cylinder hole 14, and brake fluid flows into or out of the cylinder hole 14. An annular groove 15 for accommodating the clip member 24 is formed in the vicinity of the opening end portion of the inner peripheral surface 14 a of the cylinder hole 14. The annular groove 15 has a substantially semicircular cross section and has a depth that is substantially half the thickness of the clip member 24. When the clip member 24 is accommodated in the annular groove 15, the annular groove 15 is located on the center side of the clip member 24. One half protrudes inward from the inner peripheral surface of the cylinder hole 14.

  The plug 31 is made of a synthetic resin and has a disk shape. The plug 31 has an outer diameter that fits into a portion of the cylinder hole 14 where the gas chamber 23 is formed, and gradually increases from the largest outer diameter portion 31A having the outer diameter toward the opening end side of the cylinder hole 14. A tapered portion 31B that is reduced in diameter is formed. After inserting the plug 31 into the cylinder hole 14, the clip member 24 is inserted between the tapered portion 31 </ b> B and the inner peripheral surface 14 a of the cylinder hole 14, and the clip member 24 is accommodated in the annular groove 15 and locked. The plug 31 is locked to the clip member 24 and fixed in the cylinder hole 14. Specifically, when the clip member 24 having a circular cross section is accommodated in the annular groove 15 formed on the inner peripheral surface of the cylinder hole 14, the center half of the clip member 24 protruding from the inner peripheral surface of the cylinder hole 14 is used. However, it comes into contact with the tapered portion 31B of the plug 31 and restricts the extraction of the plug 31.

  The plug 31 is formed with a breathing hole 32 that allows the gas chamber 23 to communicate with the outside of the cylinder hole 14. The breathing hole 32 is disposed at the center of the plug 31 and is formed through the inside and outside of the plug 31.

  The piston 41 is made of synthetic resin and is formed in a bottomed cylindrical shape that opens to the plug 31 side. The piston-shaped piston bottom 43 facing the bottom of the cylinder hole 14 and the cylinder hole 14 And a cylindrical piston cylindrical portion 44 facing the inner peripheral surface 14a. A gas chamber 23 defined by the piston 41 and the plug 31 is located in the inner space of the piston 41.

  The piston cylindrical portion 44 extends from the peripheral edge portion of the piston bottom portion 43 toward the plug 31 side. The outer peripheral surface of the piston cylindrical portion 44 has an outer diameter substantially equal to the hole diameter of the cylinder hole 14 and faces the inner peripheral surface 14a of the cylinder hole 14, and the piston 41 extends in the cylinder hole 14 in the axial direction. It is configured to be slidable. The piston bottom portion 43 side end of the piston cylindrical portion 44 is gradually reduced in diameter toward the piston bottom portion 43 side, and is formed between the outer peripheral surface of the reduced diameter portion 44 a and the inner peripheral surface 14 a of the cylinder hole 14. The brake fluid is also stored in the ring-shaped space.

  The piston bottom portion 43 is slightly smaller than the hole diameter of the reservoir hole 14, has an outer diameter substantially equal to the minimum diameter portion of the reduced diameter portion 44 a of the piston cylindrical portion 44, and is integrally formed with the piston bottom portion 43. A plurality of frustoconical convex portions 43 a are formed on the bottom surface of the cylinder bottom 14 of the piston bottom 43 to prevent the piston bottom 43 from adsorbing to the bottom of the cylinder hole 14.

  A housing groove 16 that houses the elastic seal member 51 is formed in a portion of the inner peripheral surface 14 a of the cylinder hole 14 that faces the piston cylindrical portion 44. The housing groove 16 is annularly recessed along the inner circumferential direction of the cylinder hole 14.

  As shown in FIG. 3A, the housing groove 16 includes a flat bottom surface 16a and a pair of side wall surfaces 16b, 16b located on both sides of the bottom surface 16a in the width direction, and the section has a substantially rectangular shape. ing. The receiving groove 16 has a bottom surface 16 a that is inclined with respect to the axis of the cylinder hole 14 so that the depth thereof gradually increases toward the opening end side of the cylinder hole 14. The side wall surfaces 16b and 16b are formed so as to be perpendicular to the axis of the cylinder hole 14 and to face each other in a parallel state. An inclined surface 16c is formed at the corner formed by the bottom surface 16a and the side wall surface 16b, and the bottom surface 16a and the inclined surface 16c, and the side wall surface 16b and the inclined surface 16c are connected at an obtuse angle. It is configured.

  On the inner peripheral surface 14 a of the cylinder hole 14 positioned on the plug 31 side of the receiving groove 16, a tapered surface 17 whose inner peripheral diameter gradually increases toward the bottom side of the cylinder hole 14 is continuous with the receiving groove 16. Is formed. The tapered surface 17 (see FIG. 3) has a surface inclined substantially 45 degrees with respect to the axis of the cylinder hole 14 when viewed from the cross-sectional direction shown in FIGS. That is, the end portion on the bottom side of the cylinder hole 14 is connected to the side wall surface 16b on the opening side of the cylinder hole 14 at an obtuse angle of about 135 degrees. Thereby, the taper surface 17 gradually reduces the width of the housing groove 16 toward the surface (the inner circumferential surface 14a of the cylinder hole 14) in the vicinity of the opening of the housing groove 16 (the inner circumferential surface 14a of the cylinder hole 14). Inclined in the direction of spreading.

  On the other hand, on the inner peripheral surface 14a of the cylinder hole 14 positioned on the bottom side of the cylinder hole 14 with respect to the housing groove 16, a tapered surface 18 that increases the inner peripheral diameter toward the opening side of the cylinder hole 14 is provided. The housing groove 16 is formed continuously. The tapered surface 18 (see FIG. 3) is inclined at about 60 degrees with respect to the axis of the cylinder hole 14 when viewed from the cross-sectional direction shown in FIGS. (That is, the opening side end of the cylinder hole 14) is connected to the side wall surface 16 b on the bottom side of the cylinder hole 14.

The elastic seal member 51 that is fitted and accommodated in the accommodation groove 16 is made of a deformable member such as rubber, and is formed in an endless shape (ring shape). The elastic seal member 51 has a rectangular cross section, and the rectangular shape has a width equivalent to the width of the receiving groove 16 (the distance between the side wall surfaces 16b and 16b of the receiving groove 16). The elastic seal member 51 is formed with an inner diameter and an outer diameter that allow the cylinder hole 14 and the piston 44 to be liquid-tight and assembled with sufficient tightening allowance so that the piston 44 can slide. The

  Since the bottom surface 16a is inclined so that the depth on the bottom side of the cylinder hole 14 is slightly shallower than the opening side, the housing groove 16 is accommodated by fitting the elastic seal member 51 into the housing groove 16. At this time, the inner peripheral corner 51a of the elastic seal member 51 located on the bottom side of the cylinder hole 14 is projected from the inner peripheral surface 14a of the cylinder hole 14 toward the center. In this state, when the piston 41 is inserted into the cylinder hole 14, the inner peripheral surface of the elastic seal member 51 is compressed by the outer peripheral surface 41 a of the piston 41 and the inner peripheral surface 51 a of the elastic seal member 51 is compressed. 41 is in contact with the outer peripheral surface 41a of 41. At this time, the elastic seal member 51 is also in contact with the bottom surface 16a and the side wall surfaces 16b and 16b of the housing groove 16, and partitions the hydraulic chamber 22 side and the gas chamber 23 side in a sealed state. Further, inclined surfaces 16c and 16c are formed between the bottom surface 16a and the side wall surfaces 16b and 16b of the housing groove 16, respectively, and are connected at an obtuse angle, so that the elastic seal member 51 is contained in the housing groove. The contact is made over the entire surface of the inner surface of 16, and an improvement in sealing performance is achieved.

At this time, as shown in FIG. 2A, the piston 41 is inserted into the cylinder hole 14 until the convex portion 43 a of the piston bottom 43 abuts against the bottom of the cylinder hole 14. The piston 41 is in a fixed position. When the piston 41 is in a fixed position, a predetermined distance is provided between the plug 31 side end portion of the piston 41 and the plug 31, and this distance is the movable distance (piston stroke amount) of the piston 41. ) and that Do not.

  Next, the operational effects of the piston 41 and the elastic seal member 51 of the reservoir 4 having the above-described configuration will be described while describing the operating states thereof.

  When the electromagnetic valve 3 directly communicating with the outlet port 11b shown in FIG. 1 is opened during wheel brake pressure reduction control in anti-lock brake control or the like, the brake fluid is released from the communication passage 21 connected to the flow path in the base 1. Tends to flow into the hydraulic chamber 22. At this time, pressure is applied to the piston 41 from the brake fluid in the hydraulic chamber 22, and the piston 41 is pressed in the cylinder hole 14 toward the plug 31 in the axial direction, and moves while elastically deforming the elastic seal member 51. (Refer to FIG. 2 (b)). As a result, inflow of the brake fluid into the hydraulic pressure chamber 22 is allowed, and the brake fluid corresponding to the distance that the piston 41 has moved can be stored.

  When the piston 41 is in a fixed position (a position where it abuts against the bottom of the cylinder hole 14), the elastic seal member 51 has an inner peripheral surface on the outer peripheral surface 41a of the piston 41 as shown in FIG. The outer peripheral surface 41a of the piston 41 becomes stronger as it goes to the inner side corner 51a.

  When pressure is applied to the piston 41 from the brake fluid in the hydraulic chamber 22, the piston 41 moves to the plug 31 side while elastically deforming the elastic seal member 51 as shown in FIG. At this time, the piston 41 is moved to a position where it abuts against the plug 31, and the abutment surface of the back surface of the plug 31 with the piston 41 constitutes a restricting surface for the movement of the piston 41. . Here, the inner peripheral surface of the elastic seal member 51 is crimped to the outer peripheral surface 41a of the piston 41, and moves to the plug 31 side (taper surface 17 side) integrally with the piston 41. The side surface near the peripheral surface is elastically deformed to a position where it abuts against the tapered surface 17. At this time, since the elastic seal member 51 is in contact with both the outer peripheral surface 41a of the piston 41 and the accommodation groove 16 with a predetermined pressure, the sealed state between the hydraulic chamber 22 side and the gas chamber 23 side is maintained. It will be elastically deformed.

  At this time, since the tapered surface 17 is formed on the plug 31 side of the housing groove 16, the opening-side inner peripheral corner portion 51 b of the elastic seal member 51 that is elastically deformed (the elastic seal positioned on the opening side of the cylinder hole 14). The inner peripheral corner portion of the member 51 moves to a space formed between the tapered surface 17 and the outer peripheral surface 41a of the piston 41. Therefore, the elastic deformation of the elastic seal member 51 is smoothly performed, and the inner peripheral surface of the elastic seal member 51 can reliably follow the movement of the piston 41. Therefore, the inner peripheral surface of the elastic seal member 51 is the outer peripheral surface 41a of the piston 41. Against slipping against.

  Here, since the plug 31 has a breathing hole 32, the pressure in the gas chamber 23 and the pressure outside the cylinder hole can be kept constant (atmospheric pressure). According to this, since the stress opposite to the pressure of the brake fluid is not generated, the movement of the piston 41 and the flow of the brake fluid into the hydraulic pressure chamber 22 can be facilitated.

  When the antilock brake control is executed, the motor 6 is driven by the electronic control unit 7 shown in FIG. 1, and when the motor 6 is driven, the pump 5 is actuated accordingly and the brake stored in the reservoir 4 is driven. The liquid flows out through the communication path 21 and is returned to the flow path in the substrate 1. At this time, as shown in FIG. 2A, the elastic seal member 51 is restored to its original shape by its restoring force, so that the piston 41 returns to the home position, and the volume of the hydraulic chamber 22 becomes the original. The volume will decrease.

  At this time, as shown in FIG. 3B, the elastic seal member 51 is originally provided by compressing the back side inner peripheral corner 51a. It is in a spring-like state against the plug 31 side, and a large restoring force can be obtained by the rollback. Therefore, it is possible to reliably return the piston 41 to the home position (see FIG. 2A).

  As described above, according to the present embodiment, the elastic deformation of the elastic seal member 51 allows the movement of the piston 41 toward the plug 31 and returns the piston 41 to a fixed position by the restoring force. The compression coil spring which required space can be abolished or reduced in size. As a result, the axial length of the piston 41 can be reduced, and the reservoir 4 can be downsized, and thus the vehicle brake hydraulic pressure control device U can be downsized. Furthermore, cost reduction can be achieved by reducing the number of parts of the reservoir 4.

  Next, a second best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 4, the reservoir 4 ′ according to the second embodiment is configured such that the plug 31 ′ partitions the inside and outside of the cylinder hole 14 in a sealed state, and the inside of the compressed gas chamber 23. The gas restoring force is used as a part of the force for returning the piston 41 to a fixed position. The plug 31 ′ is inserted into the cylinder hole 14 ′ and caulked and fixed by plastically flowing metal around the opening (tip of the cylindrical portion 1b) of the cylinder hole 14 ′ to the peripheral edge of the plug 31 ′. ing.

  In addition, since the structure of piston 41, the elastic seal member 51, etc. which are other members are the structures equivalent to 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Hereinafter, the configuration of the plug 31 ′ and its mounting structure will be specifically described. The plug 31 ′ is formed in a closed disk shape in which no breathing hole is formed. As in the first embodiment, the plug 31 ′ is formed with a tapered portion 31 ′ B that gradually decreases in diameter from the maximum outer diameter portion 31 ′ A toward the opening end side of the cylinder hole 14 ′.

  Before caulking and fixing, the cylinder hole 14 ′ has an enlarged diameter portion 19 (represented by an alternate long and short dash line in FIG. 4) at the opening portion, Has a stepped portion 19a. The maximum outer diameter portion 31′A of the plug 31 ′ has an outer diameter equivalent to the inner diameter of the enlarged diameter portion 19, and is locked to the step portion 19a when inserted into the cylinder hole 14 ′. It has become.

  When performing caulking and fixing, after the elastic seal member 51 and the piston 41 are mounted in the cylinder hole 14 ', the plug 31' is inserted into the cylinder hole 14 'so as to be locked to the stepped portion 19a. Then, a caulking jig (not shown) having a bottomed cylindrical shape is pressed against the peripheral edge of the opening of the cylinder hole 14 ′ (tip of the cylindrical portion 1 b) and pressed toward the bottom of the cylinder hole 14 ′. As a result, the metal at the peripheral edge of the opening is plastically deformed to form a plastic deformation portion 19b that presses the surface of the taper portion 31'B of the plug 31 ', and the plug 31' is caulked and fixed.

  Thus, if the plug 31 ′ is caulked and fixed to the cylinder hole 14 ′, the inside and outside of the cylinder hole 14 ′ can be partitioned in a sealed state by the plug 31 ′. As a result, the restoring force of the gas in the compressed gas chamber 23 can be used as an air spring as part of the force for returning the piston 41 to a fixed position, and the elastic sealing member 51 is an elastic member having a small restoring force. Even if it is a case where it comprises, piston 41 can be reliably returned to a fixed position. Therefore, the application range of the material used for the elastic seal member 51 can be widened.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can of course be modified as appropriate.

  For example, in the above-described embodiment, the piston 41 is formed in a bottomed cylindrical shape having a hollow inside, but is not limited thereto. The piston only needs to have an axial length that allows the outer peripheral surface to come into contact with the elastic seal member, and may be formed solid.

In the above embodiment, the case where the brake fluid pressure control device for a motorcycle is provided in consideration of the amount of brake fluid stored in the fluid pressure chamber has been described. However, the present invention is not limited to this. Absent. For example, a material having a large amount of elastic deformation is used, the length of the elastic seal member 51 in the axial direction is increased, and the inclination angle of the tapered surface 17 is not limited to the angle and can be changed as appropriate. If the structure with a large allowable amount of elastic deformation is obtained by changing the shape of the tapered surface 17 in accordance with the change , the movable distance (piston stroke amount) of the piston 41 can be increased, and the amount of stored brake fluid can be increased. Therefore, the present invention can be applied to a vehicle brake hydraulic pressure control device for four-wheeled vehicles.

1 is an exploded perspective view showing a vehicle brake hydraulic pressure control device provided with a reservoir according to a first embodiment of the present invention. It is sectional drawing which showed the reservoir | reserver which concerns on 1st embodiment of this invention, (a) is the figure which showed the non-operation state of the reservoir, (b) is the figure which showed the operation state of the reservoir. It is sectional drawing for demonstrating the deformation | transformation state of the elastic seal member of the reservoir | reserver which concerns on 1st embodiment of this invention, Comprising: (a) is the figure which showed the non-operation state of the reservoir, (b) is the action | operation of a reservoir | reserver. It is the figure which showed the state. It is sectional drawing which showed the reservoir | reserver which concerns on 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substrate 4 Reservoir 14 Cylinder hole 14a Inner peripheral surface 16 (Cylinder hole) 16 Housing groove 17 Tapered surface 21 Communication path 22 Hydraulic chamber 23 Gas chamber 31 Plug 41 Piston 41a (Piston) outer peripheral surface 51 Elastic seal member 4 'reservoir 31 'plug U vehicle brake hydraulic pressure control device

Claims (2)

A reservoir used in a vehicle brake fluid pressure control device and having a fluid pressure chamber for temporarily storing brake fluid during wheel brake pressure reduction control,
A bottomed cylinder hole formed in a base body of a brake fluid pressure control device for a vehicle and having a brake fluid communication path opened to a bottom side, a plug provided at an opening end of the cylinder hole, and an axial direction in the cylinder hole And a piston that divides the cylinder hole into a fluid pressure chamber on the communication path side and a gas chamber on the plug side.
The housing groove formed in the inner peripheral surface of the cylinder hole accommodates an elastic seal member having a rectangular cross section that abuts on the outer peripheral surface of the piston and partitions the fluid pressure chamber side and the gas chamber side in a sealed state. And
And on the inner peripheral surface of the cylinder hole located on the plug side of the receiving groove, a tapered surface is formed to increase the inner peripheral diameter toward the bottom side of the cylinder hole,
It said elastic sealing member is allowed to move to the plug side of the piston by elastic deformation to the tapered surface, to return the piston in position by a restoring force,
The plug includes a regulating surface that regulates movement of the piston by contacting the piston, and the elastic seal member maintains a pressure-bonded state to the piston even when the piston contacts the regulating surface. A reservoir for a brake fluid pressure control device for a vehicle, wherein the reservoir is elastically deformed . The plug is configured to partition the inside and outside of the cylinder hole in a sealed state,
The reservoir of the vehicle brake hydraulic pressure control device according to claim 1, wherein the restoring force of the compressed gas in the gas chamber is used as a part of the force for returning the piston to a fixed position. .

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