JP2009173070A - Brake fluid pressure control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform forced pulling/returning of a spool valve by a piston when the spool valve is locked by a simple, inexpensive and compact structure in a brake fluid pressure control device provided with a pressure adjustment device for adjusting a fluid pressure fed from an auxiliary fluid pressure source by the spool valve pushed/moved by the piston and output it. <P>SOLUTION: In the brake fluid pressure control device, the pressure adjustment device RG constituted by an advanceable-retreatable pressure adjustment piston 11; the spool valve 12 pressed by the pressure adjustment piston 11 and moved to a position corresponding to the pressing force; and a return spring 13 for resetting the spool valve is provided in a cylinder bore 2. An engagement member 22 engaged with both the pressure adjustment piston 11 and the spool valve 12 at a central side in a radial direction of the cylinder bore 2 than an outer periphery of the return spring 13 is provided, and the pressure adjustment piston 11 and the spool valve 12 are connected to each other through the engagement member 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brake fluid pressure control device for a vehicle configured by combining a pressure adjusting device that adjusts and outputs a fluid pressure supplied from an auxiliary fluid pressure source and a master cylinder.

  As a conventional example of the vehicle brake hydraulic pressure control apparatus mentioned above, for example, there is one disclosed in Patent Document 1 below. The brake hydraulic pressure control device disclosed in Patent Document 1 is used when a brake assist function is required, and a driver adjusts the hydraulic pressure supplied from an auxiliary hydraulic pressure source by a driver. The pressure is adjusted to a value corresponding to the brake operation force of the engine and output (the adjusted hydraulic pressure is called the regulator hydraulic pressure), and the regulator hydraulic pressure is applied to the power piston to assist the forward movement of the master piston. The desired brake fluid pressure is generated in the pressure chamber of the master cylinder by the force obtained by adding the assisting force of the power piston to the brake operation force by.

  An outline of the brake fluid pressure control device is shown in FIG. In the figure, MC is a master cylinder and RG is a pressure regulator. The master cylinder MC is configured by assembling a master piston 3 in a cylinder hole 2 of the cylinder body 1. Reference numeral 4 denotes a push rod, and a driver's brake operation force applied to a brake pedal (not shown) is transmitted to the master piston 3 via the push rod 4 and the power piston 5 so that the master piston 3 moves forward, and the pressure chamber R2 Pressurize the brake fluid inside.

  6 is a spring for returning the master piston 3, 7 is a center valve mechanism for communicating the pressure chamber R2 with the liquid chamber R5 that communicates with the reservoir 8 when the master piston 3 returns to the original position, and 9 is provided as necessary. The input member 10 is a contact member that transmits the forward thrust of the power piston 5 to the master piston 3. The master piston 3 and the power piston 5 may be integrally formed without the contact member 10.

  The pressure regulator RG is also provided inside the cylinder hole 2. The pressure adjusting device RG includes a pressure adjusting piston 11 having a rear surface facing the pressure chamber R2, a spool valve 12 disposed in front of the piston (left side in the drawing) and pushed by the pressure adjusting piston 11, and the spool. It comprises a return spring 13 for returning the valve 12. In the pressure adjusting device RG, the spool valve 12 is pushed by the pressure adjusting piston 11 to advance leftward in the drawing, and the valve portion formed between the shoulder portion on the outer periphery of the spool valve 12 and the sleeve 14 by the operation thereof. 15 opens, the brake fluid from the auxiliary hydraulic pressure source 16 having a power-driven pump is regulated, and the regulated fluid pressure (regulator fluid pressure) is introduced into the pressure regulating chamber R3. Are also introduced into the pressure regulating chamber R4 and the power chamber R1.

  The pressure adjusting piston 11 moves to a balance point of pressure received opposite to both ends (the hydraulic pressure of the pressure chamber R2 and the pressure adjusting chamber R3), and the spool valve 12 follows the movement and the opening degree of the valve portion 15 is increased. Adjusted. For this reason, the regulator hydraulic pressure introduced into the pressure regulating chamber R3 is in accordance with the driver's brake operating force, and the power piston 5 moves forward with the regulator hydraulic pressure, and the thrust becomes the driver's brake operating force. The added force is applied to the master piston 3 to amplify the brake fluid pressure generated in the pressure chamber R2. Therefore, it is possible to generate a braking force that is greater than the braking force that can be generated by the driver's operating force.

Note that the brake system of the vehicle is divided into two systems, and the hydraulic pressure generated in the pressure chamber R2 is supplied to the wheel cylinder 17 of one system via the hydraulic control unit 20, and the pressure is regulated. The regulator hydraulic pressure adjusted by the device RG is output to the wheel cylinder 18 of the other system via the hydraulic pressure control unit 20. The hydraulic pressure control unit 20 is a well-known device including an electromagnetic valve for pressure increase / decrease that controls the hydraulic pressure of the wheel cylinders 17 and 18 based on a command from the electronic control device.
The detailed operation of the illustrated brake fluid pressure control device is described in Patent Document 1 and the like, and further description thereof is omitted here.
Japanese Patent Laid-Open No. 11-034853

  In the brake fluid pressure control device disclosed in Patent Document 1, the spool valve 12 is returned by the force of the return spring 13, but the spool valve 12 is returned in case of a situation where the spool valve 12 cannot move due to a twist or a foreign object. A retainer 19 that transmits the force of the spring 13 to the spool valve 12 is engaged with the pressure regulating piston 11, and the spool valve 12 is forcibly pulled back via the retainer 19 when the spool valve 12 is locked and does not return with the spring force. The method is taken.

  FIG. 7 shows details of the portion. The retainer 19 has an inner diameter side edge engaged with a convex portion formed on the outer periphery of the spool valve 12, and further, the outer periphery is engaged with an annular groove formed on the inner surface of the pressure regulating piston 11. However, in this structure in which the engagement portion with the pressure regulating piston 11 is provided on the outer diameter side of the outer periphery of the return spring 13, the outer diameter of the retainer 19 is increased. It is difficult to meet the demand for a smaller master cylinder diameter and a further cost reduction of the device.

  In view of this, the present invention provides a simple, inexpensive and compact connecting structure for forcibly pulling back the spool valve by the piston when the spool valve is locked and it is difficult to return with the force of the return spring. It is an issue to be able to do by.

In order to solve the above problems, in the present invention, a piston accommodated in a cylinder hole formed in a cylinder body so as to be capable of moving forward and backward, and a spool that is pressed by the piston and moves to a position corresponding to the pressing force. Brake fluid pressure control provided with a pressure regulator that regulates the hydraulic pressure supplied from the auxiliary hydraulic pressure source to a value corresponding to the brake operating force, and is constituted by a valve and a return spring that returns the spool valve In the device
An engagement member that engages both the piston and the spool valve is provided on the radial center side of the cylinder hole from the outer periphery of the return spring, and the piston and the spool valve are connected to each other via the engagement member. .

  In order to position the spool valve and the piston on the same axis, the brake fluid pressure control device generally engages the rear portion of the spool valve with a fitting hole provided in the front portion of the piston. In the case of having such a structure, an annular groove is provided in correspondence with the inner surface of the fitting hole and the rear outer peripheral surface of the spool valve, and the engaging member is installed in the annular groove and locked to each annular groove. It is preferable to do so.

  Further, the engaging member is provided with a check claw protruding from at least one of the outer diameter side and the inner diameter side on a ring-shaped portion that can be reduced in diameter and expanded by cutting a part in the circumferential direction. Preferably, the ring-shaped portion and the check pawl are both elastically deformable, and the ring-shaped portion is provided in one of the two annular grooves (two annular grooves), and the check is provided in the other of the two annular grooves. It is particularly preferable that the claws are fitted into each elastically restored after elastic deformation.

  In addition, it is preferable that the engaging member is provided with a spring receiver that is disposed in front of the piston and supports one end of the return spring.

  The brake fluid pressure control device according to the present invention is provided with an engaging member that engages both the piston and the spool valve on the radial center side of the cylinder hole from the outer periphery of the return spring that returns the spool valve. Since the piston and the spool valve are connected to each other via the pin, the retainer diameter is reduced to the same extent as the return spring diameter by eliminating the conventional engaging claws on the outer periphery of the retainer that transmits the force of the return spring to the spool valve. be able to. Further, the engaging member is also smaller than the return spring diameter, and therefore, the master cylinder diameter is prevented from increasing due to the connecting structure of the piston and the spool valve, and the apparatus can be miniaturized.

  Further, the engaging member may be small in size, and by providing the engaging member, the structure of the retainer can be simplified and downsized, so that the cost can be further reduced.

  The operations and effects of the other configurations preferred in the above will be described in the next section.

  Embodiments of a brake fluid pressure control device according to the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings. 1 and 2 show a first embodiment. The brake fluid pressure control device of the first embodiment has the same structure and components as the conventional brake fluid pressure control device described in FIG. Therefore, the same elements and the same structural parts are denoted by the same reference numerals as those in FIG. 6 and the description thereof will be omitted. Hereinafter, differences from FIG. 6, that is, the parts characterizing the present invention will be described.

  As shown in an enlarged view in FIG. 2, the pressure regulating piston 11 and the spool valve 12 are connected using an engaging member 22. The retainer 19 is a simple perforated disk that fits on the outer periphery of the spool valve 12, and one end of the return spring 13 is supported by the retainer 19. An edge on the inner diameter side of the retainer 19 is engaged with a step surface 23 formed between a small diameter portion of the spool valve 12 and a large diameter portion of the rear outer periphery, and the force of the return spring 13 is passed through the retainer 19 to the spool valve 12. And the spool valve 12 is restored by the force. The outer diameter of the retainer 19 has a size that is not significantly different from the outer diameter of the return spring 13, and there is no outer peripheral claw that has been conventionally provided.

  A fitting hole 24 concentric with the shaft center is provided in the front part of the pressure regulating piston 11, and the pressure regulating piston 11 and the spool valve 12 are fitted by fitting the rear part of the spool valve 12 into the fitting hole 24. (The rear side of the valve) is positioned coaxially. Further, a seal portion by a seal member 25 is provided between the fitting hole 24 and the spool valve 12, and the communication between the pressure regulating chamber R3 and the chamber R6 is cut off by the seal portion. The chamber R6 communicates with the reservoir 8 in order to keep the pressure acting on both ends of the spool valve 12 at atmospheric pressure.

  The engaging member 22 is provided in the annular grooves 26 and 27 by providing annular grooves 26 and 27 corresponding to the inner surface of the fitting hole 24 provided in the pressure adjusting piston 11 and the rear outer peripheral surface of the spool valve 12. The engaging member 22 is engaged with the annular grooves 26 and 27 to serve as a connecting member, and the pressure regulating piston 11 and the spool valve 12 are connected to each other via the engaging member 22.

  As shown in FIG. 3, the engaging member 22 employed in the brake fluid pressure control device of FIG. 1 is separated into a ring-shaped portion 22a that can be reduced in diameter and expanded by cutting off a part in the circumferential direction. A plurality of check pawls 22b are provided. The check claw 22b is produced by cutting and raising a part of the ring-shaped portion 22a. The illustrated engagement member 22 has a ring-shaped portion 22a sized to fit into the annular groove 27 on the spool valve side, and the check pawl 22b is engaged with the annular groove 26 on the pressure regulating piston side. Therefore, the check claw 22b is cut and raised on the outer peripheral side of the ring-shaped portion 22a, but the check claw 22b is cut and raised on the inner peripheral side of the ring-shaped portion 22a to regulate the ring-shaped portion 22a. A structure in which the check claw 22b is engaged with the annular groove 27 on the spool valve side by fitting in the annular groove 26 on the piston side is also effective.

  Both the ring-shaped portion 22a and the check pawl 22b can be elastically deformed, and the ring-shaped portion 22a is elastically deformed and expanded in diameter, and then elastically restored and fitted into the annular groove 27. Thereafter, the spool valve 12 is inserted into the fitting hole 24 of the pressure regulating piston 11, and at this time, the check claw 22 b is elastically deformed and enters the fitting hole 24, and is elastically restored at the insertion end to be annular groove 26. It enters and locks in the annular groove 26, so that the connection between the spool valve 12 and the pressure regulating piston 11 can be easily completed by a simple operation.

  In addition, the engaging member having a structure in which the check pawl 22b is cut up to the inner peripheral side of the ring-shaped portion 22a has the ring-shaped portion 22a placed in the direction opposite to the illustrated engaging member. The spool valve 12 is previously pushed into the annular groove 26 on the pressure regulating piston 11 side, and then the spool valve 12 is pushed into the fitting hole 24 while pushing down the check pawl 22 b with the spool valve 12.

  In the brake hydraulic pressure control device of the present invention described above, the spool valve 12 is connected to the pressure regulating piston 11 on the center side of the cylinder hole 2 with respect to the return spring 13 by using the engaging member 22. It is possible to reduce the size of the outer peripheral claws that have been conventionally provided, and meet the demand for downsizing the master cylinder MC.

  Further, in the brake hydraulic pressure control device to which the present invention is applied, the pressure regulating piston 11 and the spool valve 12 are generally fitted to each other and positioned coaxially, and the fitting portion originally provided in the device. By installing the engaging member 22 in the above, an increase in the axial dimension of the master cylinder can be suppressed to zero.

  Furthermore, the engagement member 22 only needs to protrude the check claw 22b slightly to the outer diameter side or inner diameter side of the ring-shaped portion 22a and can be accommodated in a small space, so that the diameter of the master cylinder can be easily reduced. Further, the ring-shaped portion 22a and the check claw 22b of the engagement member that can be elastically deformed are elastically restored after the elastic deformation of the ring-shaped portion 22a and the check claw 22b, and are engaged with the annular groove of the mating counterpart. Since it can be stopped, the pressure regulating piston 11 and the spool valve 12 can be easily assembled and connected.

  FIG. 4 shows another embodiment of the engaging member 22. The engagement member 22 in FIG. 4 is obtained by adding a spring receiver 22c to one end of a ring-shaped portion 22a. The illustrated spring receiver 22c has a claw that extends in the axial direction and bends radially outward. A plurality (three in the figure) are provided at one end of the ring-shaped portion 22a at a constant pitch in the circumferential direction. Other configurations are the same as those of the engagement member of FIG.

  FIG. 5 shows a use state of the engagement member 22 of FIG. As in FIG. 1, the ring-shaped portion 22 a enters the annular groove 27 provided on the outer periphery of the spool valve 12 and engages with the groove, while the check pawl is cut and raised on the outer peripheral side of the ring-shaped portion 22 a. 22 b engages with the annular groove 26 on the inner surface of the fitting hole 24 provided in the pressure regulating piston 11. Further, in this state, the axially extending portion of the claw is drawn forward of the pressure regulating piston 11 from the gap provided between the inner surface of the fitting hole 24 and the outer peripheral surface of the spool valve 12, and from the drawn end. A portion bent radially outward becomes a spring receiver 22c, and one end of the return spring 13 is supported.

  The spring receiver 22c is a member that performs the same function as the retainer 19 of FIG. 1, and by providing this to the engaging member 22, the number of parts can be reduced by one and the cost reduction effect can be enhanced. The spring receiver 22c may be hook-shaped, and the hook-shaped spring receiver can easily ensure high rigidity. The hook-shaped spring receiver can also be easily produced by manufacturing the engaging member by using a hooked sleeve as a material of the engaging member 22 and separating the sleeve at one place in the circumferential direction before or after forming the check pawl. be able to.

  The engaging member provided with the hook-shaped spring receiver is provided with check claws in opposite directions on both the inner diameter side and the outer diameter side of the sleeve, and the outer diameter check claws are formed in an annular shape on the inner periphery of the pressure adjusting piston. A structure in which the check pawl on the inner diameter side is engaged with the annular groove on the outer periphery of the spool valve in the groove, or a radial step portion is formed in the middle of the sleeve in the axial direction, and that portion is either one of the two annular grooves. The engagement state with the annular groove 26 (or 27) is achieved by engaging the check claw that is latched to one side and the check claw cut and raised on the inner diameter side or the outer diameter side of the sleeve with the other annular groove. While maintaining, the spring receiving portion can be pulled out to the front of the pressure adjusting piston 11.

Sectional drawing which shows embodiment of the brake fluid pressure control apparatus of this invention 1 is an enlarged sectional view of a part of the brake fluid pressure control device of FIG. The perspective view of the engaging member employ | adopted as the brake fluid pressure control apparatus of FIG. The perspective view which shows the other form of an engaging member FIG. 4 is an enlarged cross-sectional view of a part of the brake fluid pressure control device that employs the engagement member of FIG. Sectional drawing which shows an example of the conventional brake fluid pressure control apparatus of the improvement object FIG. 6 is an enlarged sectional view of a part of the brake fluid pressure control device of FIG.

Explanation of symbols

MC Master cylinder RG Pressure adjusting device 1 Cylinder body 2 Cylinder hole 3 Master piston 4 Push rod 5 Power piston 6 Spring 7 Center valve mechanism 8 Reservoir 9 Input member 10 Contact member 11 Pressure adjusting piston 12 Spool valve 13 Return spring 14 Sleeve 15 Valve portion 16 Auxiliary hydraulic pressure source 17, 18 Wheel cylinder 19 Retainer 20 Hydraulic control unit 22 Engaging member 22a Ring-shaped portion 22b Checking claw 22c Spring receiver 23 Stepped surface 24 Fitting hole 25 Seal members 26, 27 Annular groove R1 Power chamber R2 Pressure chamber R3, R4 Pressure regulating chamber R5 Liquid chamber R6 A room communicating with the reservoir

Claims (5)

A piston (11) accommodated in a cylinder hole (2) formed in the cylinder body (1) so as to be able to advance and retreat, and a spool valve that is pressed by the piston (11) and moves to a position corresponding to the pressing force. (12) and a return spring (13) for returning the spool valve (12), and the hydraulic pressure supplied from the auxiliary hydraulic pressure source (16) is adjusted to a value corresponding to the brake operation force and output. In the brake fluid pressure control device provided with the pressure regulator (RG) to
An engagement member (22) is provided to be engaged with both the piston (11) and the spool valve (12) on the radial center side of the cylinder hole (2) from the outer periphery of the return spring (13). A brake fluid pressure control device characterized in that the piston (11) and the spool valve (12) are connected to each other via an engaging member (22).   The spool valve (12) and the piston (11) are coaxially positioned by fitting the rear part of the spool valve (12) into a fitting hole (24) provided in the front part of the piston (11). An annular groove (26, 27) is provided corresponding to the inner surface of the fitting hole (24) and the rear outer peripheral surface of the spool valve (12), and the engaging member (22) is provided to the annular groove (26, 27). 27) The brake hydraulic pressure control device according to claim 1, wherein the brake fluid pressure control device is installed in the annular groove (26, 27).   A member provided with a check claw (22b) projecting to at least one of the outer diameter side and the inner diameter side on the ring-shaped part (22a), which can be reduced in diameter and expanded by cutting a part in the circumferential direction, The brake fluid pressure control device according to claim 2, wherein the brake fluid pressure control device is used as a joint member (22).   Both the ring-shaped part (22a) and the check pawl (22b) can be elastically deformed, and the ring-shaped part (22a) is placed in either one of the annular grooves (26, 27). 26. The brake hydraulic pressure control device according to claim 3, wherein the check pawl (22b) is fitted into the other of the second and second non-removable claws (26, 27) by being elastically restored after elastic deformation.   The engagement member (22) is provided with a spring receiver (22c) disposed in front of the piston (11) and supporting one end of the return spring (13). The brake fluid pressure control device according to any one of the above.

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