192 clutches and power-stop control – Clutch and brake
Patent
1994-08-26
1996-01-09
Lorence, Richard M.
192 clutches and power-stop control
Clutch and brake
192 4B, 192103FA, 188291, F16D 6704, F16D 5702
Patent
active
054821487
ABSTRACT:
The present invention is directed to a retarder control system for protection against transmission overspeed. The system operates in conjunction with a rotatable input member and an output member that is rotatable relative to the input member. A torque transfer device is operatively connected between the relatively rotatable input and output members. Specifically, a piston assembly is operated by an input control chamber that selectively receives pressurized hydraulic fluid which effects translation of the piston assembly to actuate the torque transfer device and thereby effect a driving connection between the relatively rotatable input and output members. The present system is adapted to control a hydrodynamic retarder assembly having a work cavity to receive hydraulic fluid. The retarder input valve assembly is supported from one of the relatively rotatable members selectively to deliver pressurized hydraulic fluid from the input control chamber to the retarder cavity. In order to achieve overspeed protection the retarder input valve opens in response to a predetermined angular velocity of the relatively rotatable member on which the retarder input valve assembly is supported. In a variation of the retarder control system explained above, a dump valve assembly is provided which opens selectively to release pressurized hydraulic fluid from the work cavity of said retarder in response to the pressure of the hydraulic fluid within said retarder work cavity.
REFERENCES:
patent: 4238020 (1980-12-01), Nerstad et al.
patent: 4321990 (1982-03-01), Koch, Jr.
patent: 4324387 (1982-04-01), Steinhager
patent: 4768401 (1988-09-01), Fuehrer et al.
patent: 4981198 (1991-01-01), Klemen et al.
Dadel Martin R.
Long Charles F.
General Motors Corporation
Lorence Richard M.
Scherer Donald F.
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