| 摘要 |
A hydraulic brake device for a vehicle includes a reservoir for storing brake fluid, a master cylinder for generating brake pressure corresponding to an operation force of a brake operation member of the vehicle which is connected to the reservoir, a regulator valve for generating brake pressure corresponding to an operation force of a brake operation member of the vehicle which is connected to the reservoir, a wheel brake, and a pressure control unit which connects the wheel brake to the master cylinder and connects the wheel brake to the regulator valve to control a flow into the reservoir from the wheel brake and a flow into the wheel brake from the regulator valve under an anti-lock condition. The pressure control unit includes a first valve for disconnecting the wheel brake from the master cylinder and connecting the wheel brake to the reservoir, a second valve for disconnecting the first valve from the wheel brake, a third valve for connecting the wheel brake to the regulator valve to bypass the first and second vanes, and an orifice for restricting quantity of the brake fluid which flows into the wheel brake from the regulator valve so that the quantity of brake fluid flowing through the orifice is smaller than the quantity of brake fluid which flows into the reservoir from the wheel brake through the first and second valves.
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