Patent ID: 9080615
Filing Date: 2015-07-14
Classification: F16D

Abstract:
1. A transmission device comprising: a first clutch that includes a first clutch drum and a first piston; and a second clutch that includes a second clutch drum and a second piston, and is disposed circumferentially inward of the first clutch, wherein the first clutch includes a first clutch oil chamber enclosed by the first clutch drum and the first piston, the second clutch includes a second clutch oil chamber enclosed by the first clutch drum and the second piston, and a fastening portion, formed from a first through hole of a first side wall portion of the first clutch drum, a second through hole of a second side wall portion of the second clutch drum, and a rivet that is inserted into the first and second through holes and holds together the first and second side wall portions, is disposed circumferentially inward of the first clutch oil chamber and circumferentially outward of the second clutch oil chamber.