JPS62168973U - - Google Patents

Description

[Brief explanation of the drawing]

The attached figure is a front sectional view of a hydraulic booster that is an embodiment of the present invention. 10: Brake master cylinder, 12: Hydraulic pressure booster, 30: Housing, 32: Power piston, 34: Power pressure chamber, 38: Second piston, 4
0: First piston, 46: Jumping pressure chamber, 5
4: Reaction piston, 60: Check valve, 68
: Working projection, 82: Tank, 84: Control valve, 86
: Accumulator, 90: Spool, 92: Movement conversion mechanism, 96: First link, 98: Second link, 120: Push rod.

Claims (1)

[Claims for Utility Model Registration] A housing, which is fluid-tightly and slidably fitted into the housing, forms a power pressure chamber together with the housing, and is actuated by the fluid pressure of the power pressure chamber. a power piston that moves an output member forward; an input member that is held movably by the housing in a direction in which the power piston moves; and a valve that is movably supported by the housing; a control valve that switches the power pressure chamber between a state in which the power pressure chamber is communicated with a hydraulic pressure source, a state in which it is communicated with a tank, and a state in which it is not communicated with any of the above, by movement of the input member, the power piston, and the valve; a motion conversion mechanism that is engaged with the power piston and converts a relative motion of an input member with respect to the power piston into a motion of the valve element; By fitting them into the housing in a liquid-tight and slidable manner with the first piston facing the output member, a jumping pressure chamber is formed between both pistons, which is separated from the power pressure chamber in a liquid-tight manner. A communication passage is formed in the second piston to communicate the jumping pressure chamber with the power pressure chamber, and the communication passage allows hydraulic fluid to flow from the jumping pressure chamber to the power pressure chamber, but in the opposite direction. The first piston is provided with a check valve to prevent the first piston from contacting the second piston, and when the first piston is in contact with the second piston, the first piston acts on a valve element of the check valve to forcibly open the check valve. An operating part is provided that allows the check valve to close when the first piston moves forward a certain distance, and a small diameter part is made to protrude from the second piston to the side opposite to the first piston, and the end face of the small diameter part is provided. A stroke jumping type hydraulic booster that is characterized by facing the atmosphere.