JPS6164071U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the pressure reducing valve of this invention, and FIGS. 2 and 3 are partial vertical cross-sectional views showing its operation. 10... Casing, 11, 11'... Hydraulic pressure chamber, 12, 12'... Inlet, 13, 13'... Outlet, 14, 15, 16, 17... Communication hole, 20, 2
0'... Plunger, 22, 22'... Valve seat, 3
0... Continuous rod, 35... Cylindrical part, 34, 36... Piston, 37... Small diameter part, 38... Ring, 39
... Seal, 40 ... Cam surface, 41 ... Switch terminal.

Claims (1)

[Claims for Utility Model Registration] (1) An inlet for hydraulic pressure supplied from a hydraulic pressure source;
An outlet that supplies this hydraulic pressure to the rear wheel brakes, a valve seat that opens and closes a passage between these inlets and outlets, a hydraulic pressure-responsive plunger housed in this passage, and a hydraulic plunger that moves the plunger in the direction in which the passage opens. A pressure reducing valve consisting of a pressing spring is arranged in parallel in the same casing, a communicating hole is provided in a direction intersecting with the moving direction of the plunger, both ends of this hole are cylinders, and a connecting rod having pistons at both ends is provided. The input hydraulic pressure or the output hydraulic pressure is applied to these pistons respectively, and if either hydraulic pressure circuit stops working, the pistons are moved to the defective side and restored to the normal side. A two-system controlled pressure reducing valve characterized by limiting the stroke of the plunger and releasing the pressure reducing action. (2) an inlet for hydraulic pressure supplied from a reduced pressure source;
An outlet that supplies this hydraulic pressure to the rear wheel brake, a valve seat that opens and closes a passage between the inlet and the outlet, a plunger that responds to the hydraulic pressure, and a spring that presses the plunger in the direction in which the passage opens. pressure reducing valves are arranged in parallel in the same casing, a communicating hole is provided in a direction intersecting the moving direction of the plunger, both ends of this hole are cylinders, and a communicating rod having pistons at both ends is housed in the hole. , one piston is a stepped piston with a small diameter portion at the tip,
One cylinder is a stepped cylinder consisting of a small diameter part and a large diameter part, and the large diameter part has a larger diameter than the other piston, and a ring and an elastic seal are slidably attached to the small diameter part of the stepped piston. to maintain fluid tightness between the large diameter part of the front stepped cylinder and the small diameter part of the stepped piston, apply input hydraulic pressure or output hydraulic pressure to both pistons, and When the pressure reducing circuit stops operating, move the piston to the defective side, make the pressure receiving area on the defective side larger than the normal side, and limit the stroke of the normal side plunger to cancel the pressure reducing effect, A two-system controlled pressure reducing valve configured to return the piston to its original position by the first supplied hydraulic pressure after repairing a defect. (3) The connecting rod has a cam surface in the center thereof,
A two-system regulating pressure reducing valve according to claim 1, wherein the movement of the piston is detected by bringing a switch terminal into contact with the cam surface. (4) The connecting rod has a cam surface in the center thereof,
The two-system control operation pressure reducing valve according to claim 2, which is a registered utility model and is configured to detect movement of the piston by bringing a switch terminal into contact with the cam surface.