Patent ID: 7862465
Filing Date: 2011-01-04
Classification: F16D,F16H

Abstract:
1. An automatic transmission, comprising: two clutches that are provided in mutually different positions in a radial direction while overlapping each other in an axial direction, the two clutches each including: the operating oil chamber and the cancel oil chamber of one clutch of the two clutches positioned on a radially outer side are respectively positioned on a radially outer side of the operating oil chamber and the cancel oil chamber of the other clutch of the two clutches positioned on a radially inner side, the clutch drum of the one clutch of the two clutches includes an inner circumference side member and an outer circumference side member that are integrally structured, the inner circumference side member including a boss portion and a piston supporting portion, and the outer circumference side member including a drum portion and a bottom portion, and an oil passage through which a hydraulic pressure is supplied and discharged to and from the operating oil chamber of the one clutch of the two clutches is formed between the inner circumference side member and the outer circumference side member.