| 摘要 |
<p>A clutch device 10 for automatic transmission including a clutch drum 16, a first and a second frictional coupling elements 12, 14, both of which are supported by the clutch drum 16, a first piston 18 axially movably disposed radially outwardly of the clutch drum 16 and operating to couple the first frictional coupling elements 12, a second piston 20 axially movably disposed radially inwardly of the clutch drum 16 and operating to couple the second frictional coupling elements 14, is characterized in that : the clutch drum 16 includes an inner drum portion 26 welded on an input shaft 22, and an outer drum portion 30 welded on the inner drum portion 26 and supporting the first frictional coupling elements 12 and the second frictional coupling elements 14; the first piston 18 is axially slidable relative to the inner drum portion 26; and the second piston 20 is axially slidable relative to the rotary shaft 22. This can provide a small-size clutch device 10.</p> |
