| 摘要 |
A clutch apparatus for an automatic transmission makes it possible to reduce the number of parts, the weight, and manufacturing costs. Centrifugal hydraulic pressure due to operation oil is not generated in an operational hydraulic chamber when a clutch does not operate, that is, the operation oil is not supplied to operational hydraulic chamber, such that malfunction in which a clutch piston moves to a spring seat does not occur, and a balance hydraulic chamber and balance piston are not required. The clutch apparatus for an automatic transmission may include an operational hydraulic pressure supply hole formed at a boss portion of a retainer to be connected with an operational hydraulic chamber formed between the retainer and a clutch piston; and a sealing member disposed in a sealing groove formed in the clutch piston, making a gap between the retainer and the sealing member when a clutch does not operate, that is, operation oil is not supplied to the operational hydraulic chamber, and making the sealing groove and retainer in close contact when the clutch operates, that is, the operation oil is supplied to the operational hydraulic chamber such that the operational hydraulic chamber is kept hermetically sealed.
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