Patent ID: 8851261
Filing Date: 2014-10-07
Classification: F16D

Abstract:
1. A hydraulic control device for a friction clutch for a vehicle, which is operated by a hydraulic cylinder having pistons arranged in an axial direction thereof, comprising: a braking valve provided in an oil passage through which a working oil is discharged from said hydraulic cylinder to place said friction clutch in its engaged state, the braking valve permitting the working oil to be discharged from said hydraulic cylinder when a pressure acting on an end portion of said braking valve on the side of said hydraulic cylinder has exceeded a predetermined clutch releasing pressure value; a flow control valve configured to supply the working oil from a hydraulic pressure source to said hydraulic cylinder for placing said friction clutch in its released state, and to discharge the working oil from said hydraulic cylinder for placing said friction clutch in its engaged state; said braking valve being provided in a control oil passage connecting said flow control valve and said hydraulic cylinder; a one-way valve which is provided in said control passage, in parallel with said braking valve and which permits a flow of the working oil in a direction from said flow control valve toward said hydraulic cylinder and inhibits a flow of the working oil in a direction from said hydraulic cylinder toward said flow control valve; and a flow restrictor disposed in parallel with said braking valve, wherein said braking valve, said one-way valve, and said flow restrictor are provided in a composite valve device, and wherein said composite valve device is provided with: