| 摘要 |
A release device for a clutch comprising a cylinder disposed within a clutch housing and having a cylindrical intermediate wall portion projecting toward a release bearing, a piston having a cylindrical hollow portion and connected to the release bearing, the intermediate wall portion being slidably fitted in the hollow portion through a main seal, an operation chamber defined by a part of the hollow portion, the operation chamber facing the front end of the intermediate wall portion, an external hydraulic mechanism connected to the operation chamber, the cylinder further having an inner wall portion and an outer wall portion, both of a cylindrical shape, which fit in the piston, an auxiliary seal provided between each of the wall portions and the piston, and a drain oil passage formed in the cylinder which connects internal spaces between the inner and intermediate wall portions of the cylinder and between the outer and intermediate wall portions of the cylinder to a discharge site outside the clutch housing.
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