VEHICULAR BRAKE HYDRAULIC PRESSURE CONTROL DEVICE

Abstract

A vehicular brake hydraulic pressure control device has a first operation unit T1 including a first brake operation element; a first brake system K1 for braking a first wheel brake R corresponding to the first operation unit T1; and a first control valve unit A and B for controlling brake hydraulic pressure in the first brake system. In the device, the first operation unit T1 and the first brake system K1 are separated so as not to flow a brake fluid, and the device further comprises a brake fluid tank 30 having a reservoir function for supplying the brake fluid to the separated first brake system K1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view of a brake hydraulic pressure circuit applied to a vehicular brake hydraulic pressure control device according to the first embodiment of the present invention;

FIG. 2 is a view of a brake hydraulic pressure circuit applied to a vehicular brake hydraulic pressure control device according to the second embodiment of the present invention; and

FIG. 3 is a view of a brake hydraulic pressure circuit applied to a vehicular brake hydraulic pressure control device according to the third embodiment of the present invention.

Claims

1. A vehicular brake hydraulic pressure control device comprising: first operation unit that is provided with a first brake operation element;a first brake system that operates a first wheel brake in response to the first operation unit;a first control valve unit that is provided at the first brake system and controls brake hydraulic pressure in the first brake system;a second operation unit that is provided with a second brake operation element;a second brake system that operates a second wheel brake in response to the second operation unit; anda second control valve unit that is provided at the second brake system and controls brake hydraulic pressure in the second brake system,wherein the first operation unit and the first brake system are separated so as not to flow brake fluid therebetween, andwherein a brake fluid tank having a reservoir function is provided for supplying the brake fluid to the separated first brake system.

2. The vehicular brake hydraulic pressure control device according to claim 1, wherein the brake fluid tank is open to atmosphere.

3. The vehicular brake hydraulic pressure control device according to claim 1, wherein the first operation unit corresponding to the first brake system comprises: a master cylinder; andan output flow passage that outputs the brake fluid from the master cylinder, andwherein the output flow passage is directly connected to the first wheel brake system by a parallel system which is different from the first brake system.

4. The vehicular brake hydraulic pressure control device according to claim 1, wherein the first operation unit corresponding to the first brake system comprises: a stroke simulator that gives operation reaction force in response to the operation of the first brake operation element to the first brake operation element; anda detection unit that detects an operation amount of the first brake operation element, andwherein the first brake system comprises a pump that discharges the brake fluid to at least a first wheel hydraulic pressure passage communicating to the first wheel brake in order to correspond to the operation amount detected by the detection unit.

5. The vehicular brake hydraulic pressure control device according to claim 4, wherein the brake fluid returned to a suction hydraulic pressure passage of the pump from the first wheel brake flows into the brake fluid tank.

6. The vehicular brake hydraulic pressure control device according to claim 4, wherein the first control valve unit comprises:a first control member corresponding to the first wheel brake; anda second control member corresponding to the second wheel brake,wherein the first control member and the second control member communicate or shut off a first wheel hydraulic pressure passage communicating to the first wheel brake and a second wheel hydraulic pressure passage communicating to the second wheel brake to increase and retain the brake hydraulic pressure to the first and second wheel brakes, and returns the brake fluid in the respective first and second wheel hydraulic pressure passages to the suction hydraulic pressure passage of the pump to decrease the brake hydraulic pressure.

7. The vehicular brake hydraulic pressure control device according to claim 4, wherein the second brake system comprises: a master cylinder;a cut valve that communicates or shuts off between the master cylinder and the second control valve unit; anda suction valve that communicates or shuts off between the master cylinder and the suction hydraulic pressure passage of the pump.

8. The vehicular brake hydraulic pressure control device according to claims 1, wherein the second wheel brake is operated by an input of the brake fluid from the first brake system and the second brake system, respectively.

9. The vehicular brake hydraulic pressure control device according to claim 1, wherein the first wheel brake is operated by an input of the brake fluid from the first brake system and the second brake system, respectively.

10. The vehicular brake hydraulic pressure control device according to claim 1, wherein the first brake system is for a rear wheel side, and the second brake system is for a front wheel side.

11. The vehicular brake hydraulic pressure control device according to claim 1, wherein the first brake system is for a front wheel side, and the second brake system is for a rear wheel side.