Multiple gain trim valve for a selectively engageable friction d

Details Multiple gain trim valve for a selectively engageable friction d Multiple gain trim valve for a selectively engageable friction d

1999-06-14

2000-12-05

Estremsky, Sherry L.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475128, F16H 6104

Patent

active

061559490

ABSTRACT:
A control for a multi-speed transmission has a multiple gain trim valve that controls the engagement pressure rise in a selectively engageable torque transmitting mechanism. The trim valve has a valve spool and a plug valve longitudinally aligned in a valve bore such that four separate areas are present. One of the areas has the engagement pressure of the torque transmitting mechanism imposed thereon. Another of the areas has a control pressure imposed thereon and the remaining two areas are subjected to the trim pressure. The gain rate between the trim pressure and the engagement pressure determines the rapidity with which the torque transmitting mechanism is engaged. The control pressure reduces the effect of the trim pressure to provide a low gain rate until the product of the trim pressure and one of the areas is equal to or greater than the product of the control pressure and the area on which it operates. By reducing the control pressure to a zero value, a maximum gain rate is attained at the trim valve.

REFERENCES:
patent: 3754483 (1973-08-01), Edmunds
patent: 4422536 (1983-12-01), Shatuck
patent: 5509868 (1996-04-01), Eaton
patent: 5601506 (1997-02-01), Long et al.
patent: 5616093 (1997-04-01), Long et al.
patent: 5911244 (1999-06-01), Long et al.

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