Electro-hydraulic shift interlock apparatus for an automatic tra

Details Electro-hydraulic shift interlock apparatus for an automatic tra Electro-hydraulic shift interlock apparatus for an automatic tra

1991-09-06

1992-07-14

Lorence, Richard

Machine element or mechanism

Gearing

Interchangeably locked

74866, 74867, 3644241, B60K 4108

Patent

active

051292742

ABSTRACT:
A shift interlock mechanism for an automatic transmission includes electro-hydraulic elements internal to the transmission which are operable to inhibit the supply of fluid pressure for engaging the forward and reverse speed ranges of the transmission. The electro-hydraulic elements are activated in response to various operating parameters of the vehicle, including range selector position, engine throttle position, depression of the service brake pedal, vehicle speed, etc. The mechanism does not interfere with movement of the transmission range selector, and includes a mechanical link for overriding the interlock function when the range selector is moved to a LO forward range, thereby providing an override in the event of a failure of the electro-hydraulic elements.

REFERENCES:
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patent: 4488456 (1984-12-01), Taga et al.
patent: 4501175 (1985-02-01), Tatsumi
patent: 4763545 (1988-08-01), Shibayama et al.
patent: 4793378 (1988-12-01), Loeffler et al.
patent: 4846022 (1989-07-01), Ito et al.

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