192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1987-06-15
1989-01-03
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0076, 192 358, 192103F, F16D 2511, B60K 4102
Patent
active
047950110
ABSTRACT:
A control device for a hyudraulic friction clutch for a motor vehicle, wherein a piston is moved by a pressurized fluid supplied to a pressure chamber, to effect frictional engagement between driving and driven rotary members, and a proximity shut-off valve is disposed in the piston, for permitting the fluid to be discharged from the pressure chamber through a discharge passage when the piston has reached a ready-to-operate position from which the piston is moved to start the frictional engagement. The control device includes a hydraulic pressure source generating a predetermined line pressure, a pressure adjusting device for adjusting the line pressure to a controlled clutch pressure, a clutch control valve for applying the controlled clutch pressure to the pressure chamber to advance the piston for effecting the frictional engagement of the rotary members, and a controller for commanding the pressure adjusting device to adjust the line pressure to a predetermined lower level, when the controller commands the clutch control valve to supply the pressurized fluid to the pressure chamber for moving the piston to the ready-to-operate position. Thus, drag due to partial engagement of the clutch with the piston at the ready-to-operate position is minimized or eliminated.
REFERENCES:
patent: 2756851 (1956-07-01), Collins
patent: 3237734 (1966-03-01), Jania
patent: 3421608 (1969-01-01), Van Gorder
patent: 3690429 (1972-09-01), Honda
patent: 4083442 (1978-04-01), Ushijima
patent: 4646891 (1987-03-01), Braun
Murata Kiyohito
Ushijima Fumihiro
Bonck Rodney H.
Toyota Jidosha & Kabushiki Kaisha
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