Hydraulic circuit for torsional damper assembly of an...

Details Hydraulic circuit for torsional damper assembly of an... Hydraulic circuit for torsional damper assembly of an...

2007-05-29

2007-05-29

Lorence, Richard M. (Department: 3681)

Interrelated power delivery controls, including engine control

Plural engines

Electric engine

C475S005000, C192S055610, C192S070170, C192S201000, C192S212000, C192S10600R

Reexamination Certificate

active

11063329

ABSTRACT:
The present invention relates to a torsional damper for an electrically variable transmission. The torsional damper is equipped with a hydraulically actuable lock-out clutch to selectively directly couple the engine to the input shaft of the transmission. The electric motors provided with the electrically variable transmission can serve to effectively cancel out engine compression pulses when the springs of the torsional damper are locked out. During higher speeds the centrifugal loading placed on oil in the torsional damper increases, which may cause the lock-out clutch to inappropriately engage. The present invention hydraulically balances the hydraulic actuator (or piston) driving the lock-out clutch to appropriately regulate lock-out clutch engagement.

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