Trimmer valve with flow retention

Details Trimmer valve with flow retention Trimmer valve with flow retention

1994-09-22

1996-02-20

Wright, Dirk

Machine element or mechanism

Gearing

Interchangeably locked

477150, F16H 6106

Patent

active

054920280

ABSTRACT:
A hydraulic control for an automatically shifted power transmission has an electronically controlled governor pressure source which provides a speed and throttle sensitive pressure for controlling the shift points and trim boost in the transmission control. An inhibitor circuit is activated in the event of a discontinuance of the electrical control, resulting in maximum governor pressure, to permit selected vehicle operation in one forward ratio and a reverse ratio. Each ratio interchange is controlled by a respective shift valve and clutch control valve. Each clutch control valve has an integral trim control which is effective to control the pressure rise in the on-coming clutch without bypassing fluid to an exhaust. Also during a ratio interchange, an off-going clutch is controlled at a reduced pressure during a portion of the ratio interchange.

REFERENCES:
patent: 3886820 (1975-03-01), Lentz
patent: 4843917 (1989-07-01), Van Selous et al.
patent: 4911036 (1990-03-01), Ueki et al.
patent: 5009118 (1991-04-01), Raszkowski et al.
patent: 5399130 (1995-03-01), Long
patent: 5425688 (1995-06-01), Raszkowski

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