Patent ID: 8403806

Claim:
A transmission oil pump for an automatic transmission of a motor vehicle, the transmission oil pump being shiftable between a fast-running and a slow-running operation by a shiftable transmission ( 2 ) that is arranged, in a force flow, between a drive motor of the motor vehicle and the transmission oil pump such that the transmission oil pump is operable at two different speed levels; the shiftable transmission ( 2 ) is a simple planetary transmission which is shiftable by a clutch ( 9 ) and one of a freewheel ( 6 ) and a brake ( 10 ); and a drive input side of the transmission oil pump is connected to a carrier ( 5 ) of the planetary transmission ( 2 ) such that the planetary transmission ( 2 ) is driven via a ring gear ( 4 ), and a clutch ( 9 ) is provided between and releasably couples one of the carrier ( 5 ) and the ring gear ( 4 ), the carrier ( 5 ) and a sun gear ( 3 ) and the ring gear ( 4 ) and the sun gear ( 3 ), and a freewheel ( 6 ) is connected between the sun gear ( 3 ) and a housing ( 8 ) such that when the clutch ( 9 ) is disengaged, a transmission ratio of the drive output speed of the planetary transmission ( 2 ) is produced and the transmission oil pump is shifted to the slow-running operation, whereas when the clutch ( 9 ) is engaged, the planetary transmission ( 2 ) is blocked so as to avoid producing any transmission ratio for the drive output.