192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1982-04-29
1984-07-31
Krizmanich, George H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 1, 188106F, B60K 4128
Patent
active
044624875
ABSTRACT:
A brake pedal contacts a pin holding the push rod for the master cylinder, applying the hydraulic service brakes in the normal manner 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 brake pedal, with a gear sector pivoted about the pivot point of the brake pedal. 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 brake pedal is raised by a vacuum servo so that the pedal can be actuated to apply the parking brake without contacting the push rod pin, and therefore without hydraulic pressure resistance. Movement of the pedal with the pawl engaged exerts tension on the parking brake cable through the gear sector to apply to parking the 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: 2959261 (1960-11-01), Hemphill
patent: 3003605 (1961-10-01), Apple
patent: 3110355 (1963-11-01), Tranbarger et al.
patent: 3270840 (1966-09-01), De Claire
patent: 3299999 (1967-01-01), Martin
patent: 3333512 (1967-08-01), Parsons
patent: 3353636 (1967-11-01), Ridenour
patent: 3358797 (1967-12-01), Walton
patent: 3365036 (1968-01-01), Forrester
patent: 3419037 (1968-12-01), Griffen
patent: 3436126 (1969-04-01), Mousley
patent: 4301901 (1981-11-01), Jensen
Kaup Ralph J.
Parker Donald L.
Warwick Edward H.
General Motors Corporation
Krizmanich George H.
Manley M.
McGraw D. D.
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