JPH10278766A - Vehicle brake fluid pressure control device - Google Patents

Abstract

(57) [Problem] To provide a compact and low-cost brake fluid pressure control device for a vehicle. SOLUTION: A hydraulic pump (28, 38) that recirculates brake fluid stored in a reservoir (23, 33) to a master cylinder (12), and is installed on a discharge side of the hydraulic pump,
A valve seat member (73) and a valve member (7
7) and a lift member (81) that separates the valve member from the valve seat member, and an outer one-way valve (55) that allows only the flow of brake fluid from the discharge side of the hydraulic pump in the direction of the master cylinder. ), A valve seat member (93) installed on the suction side of the hydraulic pump, a valve member (97) contacting the valve seat member, and a suction side of the hydraulic pump and the reservoir installed on the valve seat member. A brake fluid pressure control device (15) for a vehicle, comprising: an inner one-way valve (56) including a slit (93b) communicating with the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake fluid pressure control device mainly used for a vehicle anti-skid device or a traction control device.

[0002]

2. Description of the Related Art At the time of bleeding air from a brake hydraulic piping system at the time of manufacturing a vehicle, an air bleeding gun is attached to an opening of a reservoir tank of a master cylinder, and suction is performed with the air bleeding gun to release air from the brake hydraulic piping system. After removal, the valve of the air bleeding gun was switched and the brake fluid was injected.

A conventional vehicle brake fluid pressure control device is described in Japanese Patent Application Laid-Open No. 7-165045. This device is provided with a bypass route connecting the suction side of a hydraulic pump and the main route of the brake. A one-way valve that allows the flow of brake fluid from the suction side of the hydraulic pump in the direction of the master cylinder is provided on the main route, and the air in the reservoir for the brake fluid relief of the wheel brakes is provided through this bypass route. Is sucking. However, this requires the provision of a bypass path, which not only increases the cost of the device, but also reduces the air in the section of the brake path between the suction side valve and the discharge side valve of the hydraulic pump. The air is not absorbed and remains.

Further, Japanese Utility Model Laid-Open No. 4-345566 discloses that a pressure reducing solenoid valve is opened to suck air from a relief reservoir.

[0005] However, in this case, during the air bleeding operation, the pressure reducing solenoid valve must be opened in conjunction with the operation of the air bleeding gun, which not only deteriorates the workability but also increases the manufacturing cost.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art.

[0007]

According to a first aspect of the present invention, there is provided a wheel brake to which a hydraulic pressure generated by a master cylinder is transmitted, and a brake pressure which is connected to the wheel brake. A reservoir for storing the brake fluid of the wheel brake relieved to reduce the pressure, a hydraulic pump for returning the brake fluid stored in the reservoir to the master cylinder, a discharge side of the hydraulic pump and the master cylinder. A valve seat member, a valve member that contacts the valve seat member, a biasing member that biases the valve member in a direction in which the valve member contacts the valve seat member, An outer one-way valve that includes a lift member that separates the valve member from the valve seat member against the force, and that allows only the flow of brake fluid from the discharge side of the hydraulic pump toward the master cylinder. When A valve seat member is provided between the suction side of the hydraulic pump and the reservoir, and a valve member abuts on the valve seat member. The valve member is attached from the suction side of the hydraulic pump to the reservoir. An urging member for urging the valve member into contact with the valve seat member; and an inner side member provided on the valve seat member and including a slit communicating the suction side of the hydraulic pump and the reservoir. A vehicle brake fluid pressure control device including a directional valve.

According to the brake fluid pressure control device for a vehicle according to the first aspect, the outer one-way valve separates the valve member from the valve seat member against the urging force of the urging member. Since the lift member is provided and the inner one-way valve is provided with a slit communicating the suction side of the hydraulic pump and the reservoir, air is released from the opening of the master cylinder reservoir when air is released from the brake hydraulic piping system. When suction is performed, air in the hydraulic pump and the reservoir can be suctioned via the outer one-way valve and the inner one-way valve.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of a preferred embodiment of the present invention.

FIG. 1 is an overall view of a brake system provided with a vehicle brake fluid pressure control device according to the present invention. FIG. 1 shows a diagonal brake pipe mainly used for a front wheel drive vehicle. Note that not all of the configurations shown in FIG. 1 are necessary configurations for the present invention.

[0011] The master cylinder 12 is a reservoir tank 1
2a, which is connected to a brake pedal 10 via a brake booster 11, and generates a brake pressure by operating the brake pedal 10. On the other hand, the wheel cylinders 13, 14, 16 and 17 are respectively a front left wheel,
The hydraulic pressure generated in the master cylinder 12 is mounted on the rear right wheel, the front right wheel, and the rear left wheel, and is transmitted through the vehicle brake hydraulic pressure control device 15 to apply a braking force to wheels (not shown). .

The hydraulic pressure generated in the master cylinder 12 is transmitted to the front right wheel cylinder 16 via the main path 51, the separation path 54, and the pressure increasing valve 29. Pressure reducing valve 34
The valve is normally closed, and connects the wheel cylinder 16 and the reservoir 33 via the return path 8.

The hydraulic pump 38 is driven by an electric motor 39 and transfers the brake fluid stored in the reservoir 33 to the master cylinder 12 via a damper 36 for reducing a pulsating flow due to the brake fluid and an orifice 37. Reflux.

The one-way valve 55 is an outer one-way valve installed between the discharge side 57 of the hydraulic pump 38 and the master cylinder 12, and allows only the flow from the hydraulic pump 38 to the master cylinder 12. Is what you do.

On the other hand, the one-way valve 56 is an inner one-way valve installed between the reservoir 33 and the suction side 58 of the hydraulic pump 38, and opens only in the direction from the reservoir 33 to the hydraulic pump 38. It is.

The check valve 31 is a return valve when the operation of the brake pedal is stopped during the hydraulic pressure control. Front left wheel,
Since the rear right wheel and the rear left wheel have the same configuration, the description is omitted.

FIG. 2 shows a brake fluid pressure control device 15 for a vehicle.
5 shows a pump unit 59 including a hydraulic pump 38, an outer one-way valve 55, and an inner one-way valve 56.

The hydraulic pump 38 contacts an eccentric cam 61 rotated by an electric motor 39 and the eccentric cam 61.
The plunger 63 reciprocates with respect to the pump body 71 by the eccentric rotation of the eccentric cam 61, and the spring 6 for urging the plunger 63 toward the eccentric cam 61.
5, the plunger 63 faces and the reciprocating movement of the plunger 63 by the rotation with the eccentricity of the eccentric cam 61 causes
A pump chamber 66 having a variable volume is provided.

The reciprocating movement of the plunger 63 changes the volume of the pump chamber 66, thereby causing the hydraulic pump 38
Sucks brake fluid from the reservoir 33 into the pump chamber 66 through the pipe 101, the inner one-way valve 56, and the suction pipe 91, and discharges the discharge pipe 67, the outer one-way valve 55, and the pipe 87.
, The brake fluid is discharged to the master cylinder 12 side.

The outer one-way valve 55 is connected to the hydraulic pump 38.
A valve seat 73 fixedly connected to the pump body 71, a valve retainer 75 having one end locked to an engaging portion 73 a of the valve seat 73, The ball valve 77 abutting on the seat 73, the ball valve 77 and the valve retainer 7
5 and a spring 79 that presses the ball valve 77 against the valve seat 73. Further, an O-ring seal 81a is provided, the outer periphery of which is fitted to the pump body 71 in a liquid-tight manner. , A lift member 81 slidable, a spring 83 interposed between the valve seat 73 and the lift member 81 for urging the lift member 81 leftward in FIG. 2, and a spring 83 mounted on the pump body 71. And a snap ring 85 for positioning the lift member 81 urged by the actuator.

The lift member 81 has a protruding engagement portion 81b.
The left end of the lift member 81 in FIG.
If the hand or a tool such as a screwdriver is pressed toward the valve seat 73 against the urging force of the spring 83, the engaging portion 81 b contacts the ball valve 77 and opposes the urging force of the spring 79. The ball valve 77 is separated from the valve seat 73, and the outer one-way valve 55 can be opened. The pipe 87 is connected to the master cylinder 1
It is connected to 2.

Further, a male screw may be formed on the outer peripheral portion of the lift member 81 and screwed to a female screw formed on the pump body 71. According to this configuration, the ball valve 77 can be lifted by rotating the lift member with a tool such as a driver.

The inner one-way valve 56 is connected to the hydraulic pump 38
A valve seat 93 fixed to the pump body 71, a valve retainer 95 having one end locked to an engaging portion 93 a of the valve seat 93, and a valve. A ball valve 97 in contact with the seat 93, the ball valve 97 and the valve retainer 9;
5 and a spring 99 that presses the ball valve 97 against the valve seat 93. Further, a slit 9 is provided at a contact portion of the valve seat 93 with the ball valve 97.
3b, even when the inner one-way valve 56 is closed, the suction passage 91 and the conduit 10 connected to the reservoir 33 are provided.
1 is restrictedly communicated.

In the vehicle manufacturing process, when bleeding air from the brake hydraulic piping system, an air bleeding gun (not shown) is attached to the opening of the reservoir tank 12a of the master cylinder 12, and the valve of the air bleeding gun is opened. At the same time, the lift member 81 of the outer one-way valve 55 is pushed rightward in FIG.
When separated from the air, the air in the reservoir 33 is sucked into the air release gun via the slit 93b of the inner one-way valve 56, the hydraulic pump 38, and the outer one-way valve 55.

The air in the hydraulic pump 38 is also sucked into the air bleeding gun through the outer one-way valve 55.

[0026]

As described above, according to the vehicle brake fluid pressure control device of the present invention, there is no need to provide a bypass path and no need to open the pressure reducing solenoid valve.
Since the air in the reservoir and the hydraulic pump can be evacuated, a compact and low-cost vehicle brake hydraulic pressure control device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram of a brake system to which a vehicle brake fluid pressure control device according to the present invention is applied.

FIG. 2 is a detailed view of a main part of the vehicle brake fluid pressure control device of the present invention.

[Explanation of symbols]

12 Master cylinder 13, 14, 16, 17 Wheel cylinder 15 Vehicle brake fluid pressure control device 23, 33 Reservoir 28, 38 Hydraulic pump 47, 57 Hydraulic pump discharge side 48, 58 Hydraulic pump suction side 45, 55 Outer Side one-way valve 46, 56 Inner side one-way valve 73, 93 Valve seat 77, 97 Ball valve 79, 99 Spring 81 Lift member 93b Slit

Claims (1)

[Claims] 1. A wheel brake to which a hydraulic pressure generated by a master cylinder is transmitted, a reservoir connected to the wheel brake and storing a brake fluid of the wheel brake relieved to reduce the brake pressure, and the reservoir. A hydraulic pump that recirculates the brake fluid stored in the master cylinder, a valve seat member that is installed between the discharge side of the hydraulic pump and the master cylinder, and a valve member that contacts the valve seat member. An urging member that urges the valve member in a direction in which the valve member comes into contact with the valve seat member, and a lift member that separates the valve member from the valve seat member against the urging force of the urging member. An outer one-way valve that allows only the flow of brake fluid from the discharge side of the hydraulic pump in the direction of the master cylinder; and a valve seat disposed between the suction side of the hydraulic pump and the reservoir. Components, A valve member that abuts the valve seat member, an urging member that urges the valve member from the suction side of the hydraulic pump toward the reservoir, and causes the valve member to abut the valve seat member; A brake fluid pressure control device for a vehicle, comprising: an inner one-way valve including a slit disposed on a valve seat member and communicating a suction side of the hydraulic pump with the reservoir.