Patent ID: 8826760

Claim:
An automatic transmission having high pressure actuation and low pressure lube hydraulic circuit, said transmission comprising: a hydraulic circuit ( 110 ) having a source of pressurized fluid ( 112 ), said hydraulic circuit including an actuation circuit ( 114 ) that delivers pressurized fluid used to actuate components of said transmission and a cooling circuit ( 116 ) that delivers pressurized fluid used to cool components of said transmission; said source of pressurized fluid ( 112 ) including an electrically powered motor 118 , a first pump ( 120 ) operatively driven by said motor, a second pump ( 122 ) selectively driven by said motor ( 118 ), and a clutch mechanism ( 124 ) operatively connected between said motor ( 118 ) and said second pump ( 122 ) so as to selectively engage and disengage said second pump ( 122 ) in driven relationship with said motor; said first pump ( 120 ) operable to supply pressurized fluid to said actuator circuit ( 114 ) and said cooling circuit ( 116 ) when operatively driven by said motor ( 118 ); and said second pump ( 122 ) acting to selectively supply pressurized fluid to said cooling circuit ( 116 ) when said clutch mechanism ( 124 ) is engaged.