| 摘要 |
PURPOSE:To enable quick engagement and disengagement of a clutch, by so constituting a check valve mechanism that hysteresis between opening properties and closing properties of the same mechanism is reduced, in a device being provided with the check valve mechanism so that discharge of hydraulic oil from a hydraulic cylinder for clutch operation is controlled. CONSTITUTION:A hydraulic clutch 24 possesses a piston part 241b fitting in a cylinder part 241a of a hydraulic cylinder 241 and the piston part 241b is energized in the direction of disengagement of the clutch by return spring 241c. The cylinder part 241a and an input shaft 20 are provided respectively with friction clutch plates 244b, 244a which are arranged alternately respectively and both the clutch plates are so constituted that they are pinched unitarily at the time of a rightward stroke of the piston part 241b. Then a check valve 242 constituted by incorporating a ball valve body 242B within a stepped valve hole 242A provided with a conical hole 242c, whose seat angle alpha is 90 deg.-110 deg., in the midst of the stepped valve hole 242A is provided on the piston part 241b. The valve hole 242A is formed by making the same tilt outward within a range of 15 deg.-45 deg.. |
