Control circuit for a powershift transmission

Details Control circuit for a powershift transmission Control circuit for a powershift transmission

1997-09-04

1999-02-16

Lorence, Richard M.

192 clutches and power-stop control

Clutches

Operators

192109F, 74335, F16D 2510, F16D 4806

Patent

active

058710744

ABSTRACT:
A powershift transmission includes a plurality of hydraulically operated clutch packs which are selectively engaged and disengaged to enable various gear ratios. A control circuit for such a transmission includes a system pressure source, a fluid reservoir, a control gallery, a plurality of control valves and a plurality of latching valves. Each control valve and each latching valve is connected with a corresponding one of the clutch packs, and is communicated with each other, with the system pressure source, with the reservoir and with the control gallery. The control valves, latching valves and the control gallery cooperate to prevent pressurization of any one of the clutch packs before all the clutch packs are filled with hydraulic fluid. The control valves and the latching valves also cooperate to maintain disengaged clutch packs at reservoir pressure, and to maintain engaged clutch packs at system pressure.

REFERENCES:
patent: 5168973 (1992-12-01), Asayama et al.
patent: 5179874 (1993-01-01), Hunter
patent: 5449330 (1995-09-01), Paulsen

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