192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1983-03-07
1985-11-19
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
744785, 74540, 188106F, 192 1, B60K 4128, G05G 524, G05G 1302
Patent
active
045536503
ABSTRACT:
A service brake pedal is overlapped by a parking brake pedal with both pedal arms mounted on a common axis for pivotal apply and release movements. The service brake pedal arm contacts a pin holding the push rod for the master cylinder, applying the hydraulic service brakes when the pedal is depressed. When the transmission lever is shifted into the park position a solenoid type servo is energized, engaging a pawl, mounted on the parking brake pedal arm, with a gear sector pivoted about the pivot point of the brake pedal arms. A one-way spring clutch is energized to hold the link in which the push rod pin is installed in the applied position during parking brake apply, retaining hydraulic brake pressure during that operation. When shifting to park, the parking brake pedal arm is raised by a vacuum servo so that the parking brake pedal can be actuated to apply the parking brake without contacting the service brake pedal, and therefore without hydraulic pressure resistance. Movement of the parking brake pedal with the pawl engaged exerts tension on the parking brake cable through the gear sector to apply the parking brake. When the ignition key is turned off, the spring clutch is released and the hydraulic service brakes are released. The pawl is retracted when the ignition key is turned off, and another spring clutch prevents release of the parking brake. This clutch is released upon shifting the transmission lever from park. A circuit is provided which prevents reengagement of the pawl until the transmission lever is shifted out of and then back into park.
REFERENCES:
patent: 1753370 (1930-04-01), Du Pont
patent: 3003605 (1961-10-01), Apple
patent: 3299999 (1967-01-01), Martin
patent: 4281736 (1981-08-01), Lizzio
patent: 4454936 (1984-06-01), Wise
patent: 4462487 (1984-07-01), Warwick et al.
Parker Donald L.
Warwick Edward H.
Bonck Rodney H.
General Motors Corporation
McGraw D. D.
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