Three-position shift actuator

Details Three-position shift actuator Three-position shift actuator

1994-01-11

1996-06-25

Ta, Khoi Q.

Machine element or mechanism

Gearing

Interchangeably locked

74336R, F16H 6128

Patent

active

055289495

ABSTRACT:
A three-position actuator assembly for selectively shifting a three-speed splitter type auxiliary transmission section (14) is provided. The actuator assembly includes a piston portion (160) for axially moving a selected one of two shift forks (142/148) and a pneumatic control circuit (162) comprising three three-way, two-position solenoid controlled valves (202/204/206) and two three-way shuttle valves (214/216). Only one solenoid is energized for each selectable actuator position and a failure of the pneumatic (200) or electrical power sources to the control circuit will not cause the actuator to shift out of an engaged ratio.

REFERENCES:
patent: 4555959 (1985-12-01), Braun
patent: 4736643 (1988-04-01), Richards
patent: 4748863 (1988-06-01), McNinch
patent: 4788875 (1988-12-01), Genise
patent: 4899607 (1990-02-01), Stainton
patent: 4930081 (1990-05-01), Dunkley
patent: 5012725 (1991-05-01), Leary
patent: 5044216 (1991-09-01), Steeby

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