| 摘要 |
A hydraulic actuator has a hub, an annular recessed groove on the inner peripheral surface of the hub and an oil chamber, from which a slanted oil channel is pierced to the bottom of the recessed groove. Accordingly, there is no need for the slanted oil channel to extend to the inner peripheral surface of the hub, by which the slanted oil channel can save its length. The oil is sent from the supply oil channel formed in the boss section to the annular recessed groove of the hub in slidable contact with the boss section, and to the oil chamber through the slanted oil channel.
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