JPH01161165U - - Google Patents

Description

[Brief explanation of the drawing]

The figure is a sectional view showing a main part of an embodiment of a master cylinder according to the present invention. 10...Master cylinder, 11...Cylinder body, 11a...Inner hole, 12...Primary piston, 1
2a...Protrusion part, 12b...Stepped inner hole, 12c...Small diameter hole, 12d...Large diameter hole, 12e...Radial hole, 12f
... Throttle hole, 12h... Through hole, 12i... Valve seat, 14
...Return spring, 15...Primary cup, 17...Retainer, 18...Stopper pin, 19...
Guide, 21... Valve body, 22... Valve rod, 23
...spring, V...valve mechanism, R1...supply chamber,
R2...pressure chamber.

Claims (1)

[Scope of utility model registration request] A pressure chamber and a reservoir that are fluid-tightly and slidably inserted in the axial direction via a piston cup into the inner hole of the cylinder body that accommodates the hydraulic fluid are constantly connected to the hydraulic pressure pipe in the same inner hole. a piston that forms a communicating replenishment chamber and has a communication hole that communicates the pressure chamber and the replenishment chamber; a return spring that is housed in the pressure chamber and biases the piston toward a non-operating position; attached to the tip of the piston to allow communication between the pressure chamber and the replenishment chamber through the communication hole when the piston is in the non-operating position, and when the piston has moved by a predetermined amount or more from the non-operating position; A valve mechanism is provided to cut off communication between the pressure chamber and the supply chamber, and when the piston moves by a predetermined amount or more from a non-operating position, the pressure chamber is sealed by the piston, the piston cup, and the valve mechanism. A master cylinder in which hydraulic pressure is generated in a pressure chamber, and hydraulic fluid can flow from the supply chamber to the pressure chamber through the piston cup when the piston moves from a moving position to a non-operating position, A retainer to which one end of the return spring is locked is disposed on the bottom side of the pressure chamber, and the communication hole is provided approximately at the center of the piston and extends in the radial direction, and at least one end thereof is connected to the supply chamber. a radial hole opening to the radial hole; a hole and a throttle hole formed in one of the radial holes, and the valve mechanism is provided at the distal end protrusion of the piston and extends radially through the small diameter hole of the stepped inner hole. A stopper pin is provided at both ends of the piston through a through hole that opens into the pressure chamber and extends in the axial direction so as to be relatively movable in the axial direction by more than a predetermined amount, and a stopper pin is provided on the outer periphery of the protrusion at the tip of the piston in a liquid-tight manner. a guide member that is slidably fitted in the axial direction and fixed to the stopper pin and that is detachable from the retainer at its tip; and a guide member that is seatable on a valve seat formed in a stepped portion of the stepped inner hole. a valve rod having one end fitted with the valve body and the other end loosely fitted into the small diameter hole of the stepped inner hole;
The guide member is configured with a spring that urges the valve rod in a direction in which the valve body is seated on the valve seat, and when the piston is in the non-operating position, the tip of the guide member engages with the retainer and the stopper pin engages the valve rod. When the rear ends abut and the valve body is separated from the valve seat, and the piston moves by a predetermined amount or more from the non-operating position, the guide member separates from the retainer and the valve body moves away from the valve seat due to the action of the spring. A master cylinder characterized by being designed to sit on a seat.