| 摘要 |
A hydraulic actuator for a belt type continuously variable transmission, with which a smooth operation is secured and both superior productivity and reduced manufacturing costs can be expected, includes a first cylinder provided on a movable sheave, a drum having a first drum portion that covers the first cylinder and a second drum portion that is fitted to a boss portion of the movable sheave and formed with a plurality of projections, a first plunger having a cylindrical portion that is fitted to the first cylinder and the second drum portion to form a first hydraulic chamber, and a second plunger fitted to the cylindrical portion and the first cylinder to form a second hydraulic chamber. An oil passage connecting the first hydraulic chamber and the second hydraulic chamber is formed by a gap between the second drum portion and cylindrical portion, which are fitted together.
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