| 摘要 |
PURPOSE:To use a valve mechanism combinedly as a change-over valve and ensure that a slipping operation of a frictional clutch can be carried out through a positional control of a clutch disk of the clutch. CONSTITUTION:A clutch operating shaft 13 is constituted to be coaxial with the clutch, and the forward and reverse rotations and the slipping of the clutch are controlled by advancing and retracting the shaft 13. A piston 17 is formed at an end of the shaft 13, and the interior of a cylinder 16 is partitioned into a contraction action oil chamber 18 and a stretch action oil chamber 19. A rotor 21 rotated by an operating lever 22 is provided in the piston 17 and is provided with slanted grooves 34A, 34B, 35. The grooves 34A, 34B, 35 are faced to oil passages 31, 32 communicated to each of the oil chambers, whereby the piston 17 is moved forwards or backwards in accordance with the amount of rotation of the rotor 21. The piston 17 coaxial with the clutch is further controlled by a servo valve which is also coaxial. |
