Three position actuator for shifting a two speed transfer case

Details Three position actuator for shifting a two speed transfer case Three position actuator for shifting a two speed transfer case

1990-04-19

1991-05-07

Kwon, John T.

Expansible chamber devices

Relatively movable working members

First working member moves second coaxial working member...

92 62, 92 65, 92110, 92151, 74335, 74346, F01B 700

Patent

active

050127250

ABSTRACT:
The present invention includes a three position actuator which is used to position the gear range control lever on a two speed transfer case. Three positions are required to achieve HIGH, LOW and NEUTRAL. Two individual air chambers may be selectively charged with compressed air to move two pistons along a common actuator rod to achieve linear translation of the control lever to selectively position the transfer case in HIGH, NEUTRAL or LOW range. The transfer case is shifted from LOW to NEUTRAL to HIGH by releasing the charge of compressed air thereby permitting the return spring to shift the control lever to HIGH gear range. Thus, in the event of failure of the system supplying the compressed air, the actuator will return the transfer case to HIGH gear range which provides an appropriate gear range selection for limp home mode.

REFERENCES:
patent: 787479 (1905-04-01), Tanner
patent: 2298359 (1942-10-01), Ernst et al.
patent: 3752040 (1973-08-01), Pawloski et al.
patent: 3766793 (1973-10-01), Knop
patent: 3968735 (1976-07-01), Boisde et al.
patent: 3978884 (1976-09-01), Sundstro
patent: 4141220 (1979-02-01), Feucht
patent: 4205594 (1980-06-01), Burke
patent: 4593606 (1986-06-01), Klatt et al.
patent: 4817766 (1989-04-01), Nilsson

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