System for selecting the operating ranges of an automatic transm

Details System for selecting the operating ranges of an automatic transm System for selecting the operating ranges of an automatic transm

1993-12-20

1995-08-01

Marmor, Charles A.

Machine element or mechanism

Gearing

Interchangeably locked

475133, 475134, 477125, B60K 4124

Patent

active

054372046

ABSTRACT:
A system for directing line pressure alternately to a forward drive circuit and a reverse drive circuit includes three solenoid-operated select valves that direct pressure from a line pressure source to a reverse drive select valve, a forward drive select valve, reverse drive select valve, a range select switch assembly, pressure switches, and two coaxial range control valves. The two drive select valves are interconnected to form a hydraulic latch whose outputs are connected to the range control valve such that either the forward drive friction elements are pressurized, the reverse drive friction elements are pressurized, or none of the friction elements are pressurized.

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