Transmission range shift control with neutral position lock

Details Transmission range shift control with neutral position lock Transmission range shift control with neutral position lock

2011-01-04

2011-01-04

Pang, Roger (Department: 3655)

Machine element or mechanism

Gearing

Interchangeably locked

C477S125000

Reexamination Certificate

active

07861612

ABSTRACT:
A range selection control system for a transmission facilitates safe operation of a power take off. A fluid actuated range piston assembly within a range cylinder moves between low range and high range positions. Range cylinder and range piston assembly define sealed high range and low range chambers. A neutral cylinder intersects range cylinder. A fluid actuated neutral piston assembly within neutral cylinder defines a neutral chamber. Neutral piston assembly engages range control piston assembly responsive to pressurization of neutral chamber. Neutral piston assembly is received by an engagement feature of range piston assembly when range control piston assembly is in a neutral position, retaining range piston assembly there. An electrically responsive locking mechanism locks neutral piston assembly in place when range piston assembly is in the neutral position. The locking is controlled by a condition of an electrical switch indicating a transmission condition.

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patent: 6339973 (2002-01-01), Monette
patent: 6935474 (2005-08-01), Bell et al.
patent: 2002/0029645 (2002-03-01), Jackson et al.

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