Patent ID: 8808129

Claim:
An automatic transmission ( 1 ) with a hydraulic system ( 4 ) comprising: a main transmission pump device for supplying various transmission components with hydraulic fluid, which are driven by torque applied to an automatic transmission input shaft ( 2 ) such that a force flow, between the automatic transmission input shaft ( 2 ) and an automatic transmission output shaft ( 3 ), is produced by various hydraulically actuated transmission components which facilitate coupling of the automatic transmission input shaft ( 2 ) to the automatic transmission output shaft ( 3 ) for transferring the force flow through the automatic transmission, and, when the force flow supplied by the automatic transmission input shaft ( 2 ) is interrupted, the main transmission pump device is prevented from supplying hydraulic fluid to the hydraulic system ( 4 ), the hydraulic system ( 4 ) being formed with an auxiliary pump device ( 5 ) by which the hydraulic system ( 4 ) can also be supplied with hydraulic fluid, and the auxiliary pump device ( 5 ) being exclusively driven by a torque flowing from the automatic transmission output shaft ( 3 ) when a coupling device ( 6 ) is engaged.