Clutch for vehicles

Details Clutch for vehicles Clutch for vehicles

1992-12-22

1994-04-12

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Operators

192 91R, 192109F, 1374875, F16D 2514

Patent

active

053017811

ABSTRACT:
A vehicle clutch is comprised of a supply cylinder activated by a clutch pedal and a receiving cylinder for hydraulic fluid displaced from the supply cylinder when the clutch pedal is pressed down. A fluid line connects the two cylinders. A safety device is connected within the fluid line and comprises at least one throttle element for reducing the fluid flow from the receiving to the supply cylinder when a preset engaging speed for engaging the clutch is surpassed. The safety device includes a measuring orifice connected in parallel to the throttle element. A solenoid is provided which has a closing device for closing the fluid line between the two cylinders with the exception of the throttle element when a preset fluid pressure differential measured before and behind the measuring orifice is surpassed. Two pressure switches are coordinated with the measuring orifice for measuring the fluid pressure differential at the measuring orifice. The pressure switches actuate the solenoid for moving the closing device to close the fluid line. In a second embodiment the safety device has a switching piston held in an open position by a plate spring for closing the fluid line with the exception of the throttle element. The plate spring is adjusted such that its working range is within a descending portion of its force-travel distance characteristic curve. A solenoid and the pressure switches are eliminated in the second embodiment.

REFERENCES:
patent: 2723736 (1955-11-01), Alexandresch
patent: 4133511 (1979-01-01), Hartmann et al.
patent: 4478237 (1984-10-01), Blake et al.
patent: 4488574 (1984-12-01), Bartholomaus
patent: 4674613 (1987-06-01), Sikorski
patent: 5036965 (1991-08-01), Cortesi et al.
patent: 5168973 (1992-12-01), Asayama et al.
Patent Abstracts of Japan; 62-265033; Nov. 17, 1987.

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