JPH01154334U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a hydraulic clutch which is an embodiment of the present invention. FIG. 2 is a diagram showing essential parts of another embodiment of the present invention, and corresponds to FIG. 1. 12: Hydraulic clutch, 22: Clutch case (
40: Piston, 46: Cylinder bore, 50: Pressure chamber, 52: Pressing plate (moving member), 56: Clutch disk (driven rotating body), 62: Opening/closing valve, 66: First discharge oil path (discharge oil path), 76: clutch pressure oil path (supply oil path), 7
8: Second discharge oil passage (discharge oil passage), 80: Flow rate adjustment valve (throttle), 82: Drain, 90: First oil passage (supply oil passage), 96: Second oil passage (supply oil passage), 98:
Pressure reducing valve, 104, 116: switching valve, 105: feedback oil path.

Claims (1)

[Claims for Utility Model Registration] A movable member that is moved to frictionally engage a driving rotor and a driven rotor with each other, and a movable member that is slidable within a cylinder bore to directly drive the movable member. Communication between the fitted piston and a discharge oil passage provided in the piston and normally closed to discharge the pressure chamber in the cylinder bore and the hydraulic oil in the pressure chamber is prevented, but when the piston moves an on-off valve that opens in relation to the relative position of the piston and the movable member to communicate the pressure chamber and the discharge oil path when the piston is brought close to a predetermined position with respect to the member; , a flow rate control valve that is provided between the discharge oil passage and the drain and that suppresses the flow rate of the discharge oil passage by reducing its opening degree in relation to accelerator operation; and a feedback oil pressure valve from the pressure chamber. a pressure reducing valve that reduces the hydraulic pressure supplied from the supply oil passage to the pressure chamber based on the oil pressure, while increasing the oil pressure supplied to the pressure chamber by releasing the pressure reducing action as the oil pressure of the discharge oil passage increases; In a hydraulic clutch of the type, a restriction is provided in the discharge oil passage to generate hydraulic pressure even when the flow rate control valve is fully open, while when hydraulic oil is not discharged from the pressure chamber to the discharge oil passage, Although the hydraulic pressure in the pressure chamber is in a first switching state in which the feedback is not made to the pressure reducing valve, when the hydraulic oil is discharged from the pressure chamber to the discharge oil passage, the flow resistance of the throttle causes the hydraulic oil to flow into the discharge oil passage. A hydraulic clutch comprising a switching valve that is switched to a second switching state in which the generated hydraulic pressure feeds back the hydraulic pressure in the pressure chamber to the pressure reducing valve.