A brake system for a vehicle including a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by movably supporting an input piston and a pressure piston in a cylinder. A high-pressure supply pipe of an accumulator is coupled to wheel cylinders via hydraulic supp
A brake system for a vehicle including a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by movably supporting an input piston and a pressure piston in a cylinder. A high-pressure supply pipe of an accumulator is coupled to wheel cylinders via hydraulic supply pipes, and coupled to the rear pressure chamber via a hydraulic supply pipe and a second hydraulic pipe. Pressure booster valves and pressure reducing valves are attached to the hydraulic pressure supply pipes, respectively. The wheel cylinder is coupled to the front pressure chamber via the first hydraulic pipe, and a coupling pipe for coupling a first hydraulic pipe and the hydraulic supply pipe is provided with the switching valve.
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1. A brake system for a vehicle, comprising: an operation member on which a braking operation is performed by an occupant;a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by a drive piston, which is movable and supported in the master cylinder and which out
1. A brake system for a vehicle, comprising: an operation member on which a braking operation is performed by an occupant;a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by a drive piston, which is movable and supported in the master cylinder and which outputs a hydraulic pressure in the front pressure chamber by the drive piston being moved by the operation member;a control pressure setting unit configured to set a target control pressure according to an operation force input from the operation member to the drive piston;a hydraulic pressure supply source;first and second wheel cylinders coupled to the front pressure chamber that generate a braking force to wheels;a first pressure control valve that adjusts a hydraulic pressure from the hydraulic pressure supply source on the basis of the target control pressure, and that outputs a first adjusted hydraulic pressure to the first wheel cylinder;a second pressure control valve that adjusts the hydraulic pressure from the hydraulic pressure supply source on the basis of the target control pressure, and that outputs a second adjusted hydraulic pressure directly to the rear pressure chamber to assist the drive piston to output the hydraulic pressure in the front pressure chamber directly to one of the first and second wheel cylinders; anda switching valve that makes a hydraulic connection between the first and second wheel cylinders or that interrupts the hydraulic connection. 2. The brake system for a vehicle according to claim 1, wherein the first and second wheel cylinders are wheel cylinders that generate a braking force to right and left front wheels. 3. The brake system for a vehicle according to claim 1, wherein the hydraulic pressure supply source includes an accumulator. 4. The brake system for a vehicle according to claim 1, further comprising third and fourth wheel cylinders coupled to the hydraulic pressure supply source that generate a braking force to right and left rear wheels, andthird and fourth pressure control valves that adjust the hydraulic pressure from the hydraulic pressure supply source on the basis of the target control pressure and that output respective third and fourth adjusted hydraulic pressures to the third and fourth wheel cylinders. 5. The brake system for a vehicle according to claim 1, wherein the drive piston includes an input piston and a pressure piston disposed in series in the master cylinder, an operation force of the operation member is inputted to the input piston,the front pressure chamber is defined in front of the pressure piston, andthe rear pressure chamber is defined between the input piston and the pressure piston. 6. The brake system for a vehicle according to claim 1, wherein a hydraulic line that adjusts the hydraulic pressure from the hydraulic pressure supply source and that outputs the first adjusted hydraulic pressure to the first wheel cylinder is provided with a power separating mechanism in series with the first pressure control valve. 7. The brake system for a vehicle according to claim 6, further comprising a coupling line that couples the first and second wheel cylinders while bypassing the power separating mechanism,wherein the coupling line is provided with the switching valve. 8. The brake system for a vehicle according to claim 1, wherein the switching valve makes the hydraulic connection between the first and second wheel cylinders or interrupts the hydraulic connection based on the first hydraulic pressure adjusted by the first pressure control valve. 9. The brake system for a vehicle according to claim 6, wherein the switching valve makes the hydraulic connection between the first and second wheel cylinders or interrupts the hydraulic connection based on a hydraulic pressure acting on the power separating mechanism. 10. The brake system for a vehicle according to claim 9, wherein the hydraulic connection between the first and second wheel cylinders is interrupted by the first pressure control valve making a pre-control hydraulic pressure act on the power separating mechanism, and after that, the hydraulic pressure from the hydraulic pressure supply source is adjusted by the first and second pressure control valves on the basis of the target control pressure. 11. The brake system for a vehicle according to claim 1, wherein when current flows to the switching valve, the switching valve interrupts the hydraulic connection between the first and second wheel cylinders, and when a control pressure of any of the first and second wheel cylinders is lower than the target control pressure by a preset specific value or more, the switching valve makes the hydraulic connection between the first and second wheel cylinders. 12. The brake system for a vehicle according to claim 11, wherein when control pressures of both of the first and second wheel cylinders are lower than the target control pressure by the preset specific value or more, the switching valve interrupts the hydraulic connection between the first and second wheel cylinders. 13. The brake system for a vehicle according to claim 1, wherein when current does not flow to the switching valve, the switching valve makes the hydraulic connection between the first and second wheel cylinders. 14. The brake system for a vehicle according to claim 1, wherein the drive piston outputs the hydraulic pressure in the front pressure chamber to the second wheel cylinder when current flows to the switching valve, and outputs the hydraulic pressure in the front pressure chamber to the first and second wheel cylinders when current does not flow to the switching valve. 15. The brake system for a vehicle according to claim 4, wherein the drive piston outputs the hydraulic pressure in the front pressure chamber to the second wheel cylinder when current flows to the switching valve, and outputs the hydraulic pressure in the front pressure chamber to the first, second, third, and fourth wheel cylinders when current does not flow to the switching valve. 16. A brake system for a vehicle, comprising: an operation member on which a braking operation is performed by an occupant;a master cylinder in which a front pressure chamber and a rear pressure chamber are defined by a drive piston, which is movable and supported in the master cylinder and which outputs a hydraulic pressure in the front pressure chamber by the drive piston being moved by the operation member;a control pressure setting unit configured to set a target control pressure according to an operation force input from the operation member to the drive piston;a hydraulic pressure supply source;first and second wheel cylinders coupled to the front pressure chamber and third and fourth wheel cylinders coupled to the hydraulic pressure supply source, which generate a braking force to wheels;a first pressure control valve that adjusts a hydraulic pressure from the hydraulic pressure supply source on the basis of the target control pressure, and that outputs a first adjusted hydraulic pressure to the first wheel cylinder;a second pressure control valve that adjusts the hydraulic pressure from the hydraulic pressure supply source on the basis of the target control pressure, and that outputs a second adjusted hydraulic pressure directly to the rear pressure chamber to assist the drive piston to output the hydraulic pressure in the front pressure chamber directly to one of the first and second wheel cylinders; andone switching valve that makes a hydraulic connection between the first, second, third, and fourth wheel cylinders or that interrupts the hydraulic connection.
Hiroshi Isono JP; Yasuji Mizutani JP, Vehicle braking system having devices for controlling fluid flows between pressurizing and assisting chambers of master cylinder and pressure source and reservoir.
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