| 摘要 |
<p>PURPOSE:To prevent a snap ring from slipping out of an insert groove by a method wherein contact faces of the snap ring and the inner wall of the insert groove are contacted with each other with a rough surface to increase a frictional force of the contact faces. CONSTITUTION:When the hydraulic motor is operated, a pressure P acts on an external change-over valve body 14 and a force F which moves the snap ring 28 toward the center acts on the snap ring 28 fixing the change-over valve body 14. However, since the snap ring 28 and the inner wall of the insert groove 17 are contacted with each other with a rough surface, the frictional force of the contact faces is increased, the force F is suppressed and the snap ring 28 is restricted. Accordingly, the snap ring 28 is prevented from slipping out of the insert groove 17.</p> |
