Vehicle transmission hill holder with releasable one way clutch

Details Vehicle transmission hill holder with releasable one way clutch Vehicle transmission hill holder with releasable one way clutch

1988-06-28

1989-09-19

Braun, Leslie A.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 7, 74335, 74336R, B60K 4126

Patent

active

048672912

ABSTRACT:
A hill holder device for a vehicle manual transmission includes a releasable one-way clutch which is coupled to the countershaft of the transmission. In particular, the one-way clutch includes a sprag clutch having an inner race secured to the countershaft, and an outer race secured to the vehicle transmission case by means of a releasable locking mechanism. When the locking mechanism is in its locked position, the sprag clutch enables rotation of the countershaft in only one direction. Thus, if the transmission is in a forward gear and comes to a stop on an ascending grade, the hill holder will lock the vehicle drive train and prevent the vehicle from rolling back down the grade, without requiring the driver to apply the brakes. Similarly, if the vehicle is in a reverse gear and is stopped on a descending grade, the hill holder will prevent the vehicle from rolling in a forward direction down the grade. If necessary, the locking mechanism can be unlocked to release the hill holder in order to facilitate shifting in the event torque lock of the vehicle drive train locks the gear shifting components after the hill holder has become engaged on an inclined surface.

REFERENCES:
patent: 2003963 (1935-06-01), Banker
patent: 2038985 (1936-04-01), Browne
patent: 2049798 (1936-08-01), Booth et al.
patent: 2609901 (1952-09-01), Rauen
patent: 2981388 (1961-04-01), Peras
patent: 4650046 (1987-03-01), Parsons

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