| 摘要 |
<p>In a phase change mechanism in which the phase of a driven member 12 relative to a drive member 10 is adjusted by axial displacement of an actuating rod 30 connected to the piston 50 of a hydraulic jack rotatable with the drive and driven members, the cylinder 52 of the hydraulic jack has a double-skinned wall, and the gap 54 between the two skins of the cylinder wall serves as a passage for supplying oil to and from one of the working chambers of the hydraulic jack.</p> |
