| 摘要 |
A hydraulic brake device for a vehicle includes a reservoir for storing brake fluid, a master cylinder connected to the reservoir generating brake pressure responsive to an operation force of a brake pedal, a hydraulic power source connected to the reservoir generating hydraulic pressure responsive to the operation force of the brake pedal, a wheel brake for applying a brake force and a pressure control unit connecting the wheel brake to the master cylinder, the reservoir and the hydraulic power source to control brake fluid flow into the reservoir from the wheel brake and brake fluid flow into the wheel brake from the hydraulic power source. The pressure control unit includes a first valve disconnecting the wheel brake from the master cylinder and connecting the wheel brake to a hydraulic wheel brake passage, a second valve disconnecting the hydraulic wheel brake passage from the hydraulic power source and connecting the hydraulic wheel brake passage to the reservoir, a third valve disconnecting the second valve from the wheel brake, and an orifice for connecting the hydraulic power source to the first valve bypassing the second valve and the third valve device and restricting a quantity of the brake fluid which flows into the wheel brake from the hydraulic power source so that the quantity of the brake fluid flowing through the orifice to the wheel brake is smaller than the quantity of brake fluid which flows into the reservoir, from the wheel brake through the first, second and third valve valves.
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