| 摘要 |
A structure of an automatic transmission includes first and second clutches which are arranged radially so that one is surrounded by the other. This arrangement can reduce the size of the automatic transmission. For example, the first clutch has a first clutch drum splined to an input shaft of the transmission, a first clutch hub, and a first clutch pack between the first clutch drum and hub. The second clutch has a second clutch drum received in, and splined to, the first clutch drum, a second clutch hub, and a second clutch pack therebetween. The second clutch pack is surrounded by the first clutch pack. The second clutch further includes a piston which encloses the first clutch drum and which has a pushing portion on one side of the second clutch pack and a pressure receiving portion on the opposite side.
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