Patent ID: 8449422

Claim:
An automatic transmission ( 1 ) for a motor vehicle, with at least one of a shifting and a starting element ( 3 ) in the form of either a clutch or a brake, and with a hydraulically operated actuator ( 21 ) for actuating the at least one of the shifting and the starting element ( 3 ), the actuator ( 21 ) comprising a cylinder ( 18 ) and a piston ( 2 ) being guided within the cylinder ( 18 ), a pressure chamber ( 4 ) being formed between the cylinder ( 18 ) and the piston ( 2 ), and hydraulic pressure medium flowing into the pressure chamber ( 4 ) via an inlet ( 5 ), wherein the pressure medium is first fed via a component ( 11 ), fixed on a housing and, from there, into the pressure chamber ( 4 ) of the actuator ( 21 ) via at least one rotating component ( 16 ); at least one rotary passage ( 15 ′, 15 ″) for the pressure medium is formed between the component ( 11 ) fixed on the housing and the rotating component ( 16 ) such that the pressure medium flows radially outward through the at least one rotary passage from the component ( 11 ) fixed on the housing to the rotating component, and a radial distance (R 1 ) of a radial mid-point of the rotary passage ( 15 ′, 15 ″) from the rotational axis ( 9 ) of a central shaft ( 10 ) of the automatic transmission ( 1 ) is larger than a smallest radial distance (R 2 ) of the pressure chamber ( 4 ) from the rotational axis and smaller than a largest radial distance (R 3 ) of the pressure chamber ( 4 ) from the rotational axis.