End of travel stop for transfer case actuator

Details End of travel stop for transfer case actuator End of travel stop for transfer case actuator

1995-12-15

1997-08-19

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

74335, 74526, F16H 116, F16H 5902

Patent

active

056576676

ABSTRACT:
A vehicle transfer case for changing between two- and four-wheel modes of operation has a transmission with an inventive stop. The stop extends radially outwardly beyond the nominal height of gear teeth on a worm gear in the transmission. The stop engages a worm which is part of the transmission at a location outside of a primary contact area between the worm and worm gear. When the stop contacts the worm it stops further rotation of the worm gear. The motor for the worm gear is reversible such that both the worm and worm gear can rotate in either direction. A single stop defines two circumferentially spaced ends of travel. Since the stop contacts a moving surface on the worm, there is a reduced likelihood of seizure when compared to the prior art.

REFERENCES:
patent: 2223997 (1940-12-01), Lorentzen
patent: 2766638 (1956-10-01), Vice
patent: 3398590 (1968-08-01), Campbell et al.
patent: 3448624 (1969-06-01), Brown
patent: 3490307 (1970-01-01), Jetter
patent: 4664217 (1987-05-01), Welch et al.
patent: 5062135 (1991-10-01), Ohike
patent: 5407024 (1995-04-01), Watson et al.
patent: 5409429 (1995-04-01), Showalter et al.

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