| 摘要 |
<p>PURPOSE:To make accurate a relation between a clutch action and a clutch pedal control position of thinning an outside circumference portion of a valve seat of a valve which is fitted on a valve body and itstalled to be able to contact the end surface of a piston. CONSTITUTION:The valve 43, by making thinner a valve seat 33a outside circumference portion which is pressed out by a remaining pressure P in a press-out chamber them that of a conventional valve 33, has the shape of the outside circumference portion provided with chamfering 43b at the outside circumference front surface. A valve seat 43a is installed in the inside diameter portion which has a least influence by opening against the conventional valve 33. Accordingly, at a clutch pedal position close to the specified position of about 40%, the clutch pedal control position when the valve seat 43a in lifted up from a piston end surface 2d and a clutch action starts, is made close to the one when the clutch action is completed.</p> |
