JPH038959U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a piping system diagram of a hydraulic pressure control device for an anti-skid device according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of a valve device in the same system diagram, and Fig. 3A;
FIGS. 3B and 3C are enlarged cross-sectional views of half of the valve device for explaining the operation thereof. In the figure, 6...valve device, 21...main body, 2
2... Accumulator cover, 27... Accumulator piston, 30... Brake fluid pressure accumulation chamber, 31... Master cylinder pressure chamber, 32... Through hole, 33... Axial passage, 34... Valve ball, 39... Valve drive piston, 42...
Relief piston, 43... Spring receiving member, 44...
Spring for accumulator.

Claims (1)

[Scope of utility model registration request] A hydraulic pressure control valve is disposed between the master cylinder and the brake cylinder of the wheel brake device, and controls the brake fluid pressure of the brake cylinder in response to a command from a control unit that evaluates the skid state of the wheel. A check valve device is disposed between the pressure control valve and the master cylinder and has a check valve function in which the direction from the master cylinder to the hydraulic pressure control valve is the forward direction, and a brake fluid is controlled by the hydraulic pressure control valve. When reducing the pressure, a reservoir for storing brake fluid discharged from the brake cylinder via the hydraulic pressure control valve, pressurizing the brake fluid in the reservoir, and connecting the check valve device and the hydraulic pressure control valve. The check valve device and the accumulator are provided in a common housing, and the check valve device and the accumulator are provided in a common housing, and the brake fluid in the accumulator is In the hydraulic pressure control device for an anti-skid device, the check valve device is configured to establish a state in which a master cylinder side and a hydraulic pressure control valve side are in free communication when a predetermined accumulation amount is reached. an accumulator piston disposed to be movable according to the amount of brake fluid accumulated in the accumulator; a first spring that biases the accumulator piston in one direction; A brake fluid pressure accumulation chamber and a master cylinder pressure chamber defined between the inner wall of the housing and the accumulator piston,
A passage for communicating the brake fluid pressure accumulation chamber and the master cylinder pressure chamber, a valve driving piston disposed to be movable relative to the accumulator piston within the passage, and the valve driving piston. a second spring that biases the brake fluid pressure chamber in the one direction; a first connection port that is formed in the housing and connected to the master cylinder side and constantly communicates with the master cylinder pressure chamber; and a first connection port that constantly communicates with the brake fluid pressure chamber. a second connection port formed in the housing and connected to the discharge port side of the hydraulic pump; and a movement amount for limiting the movement amount of the accumulator piston in a direction opposite to the one direction. Normally, the check valve device is in a state where the passage is freely communicated by the valve driving piston, and when the hydraulic pressure in the master cylinder pressure chamber exceeds a predetermined value, the valve driving piston is moved in a direction opposite to the one direction against the spring force of the second spring to cause the check valve device to assume a state in which it functions as a check valve, and anti-skid control is started to stop the hydraulic pump. When is driven, brake fluid flows into the brake fluid pressure accumulation chamber, and the accumulator piston moves in the opposite direction, and when it moves to a position regulated by the movement amount regulating means, the above-mentioned A hydraulic pressure control device for an anti-skid device, characterized in that a valve driving piston causes the check valve device to resume free communication with the passage.