Patent ID: 8191900

Claim:
An oil seal disposed between a stationary body and a rotation body which is rotatably attached to the stationary body, comprising: an outer member fitted to the stationary body; an inner member which is integrally rotatably fitted to the rotation body and is assembled together with the outer member such that a prescribed gap is formed between the inner member and the outer member; a movable member which is disposed in the prescribed gap, wherein the movable member is provided to the inner member such that it is not in contact with the outer member when rotation of the rotation body is stopped and that it is displaced in the direction to approach the outer member, coming into contact with the outer member to close the prescribed gap as the rotational speed of the rotation body increases; and another movable member which is disposed in the prescribed gap, wherein: the another movable member is provided to the inner member such that the another movable member is in contact with the outer member and the prescribed gap is closed when rotation of the rotation body is stopped, and the another movable member is displaced in the direction to be separated from the outer member such that the prescribed gap is opened as the rotational speed of the rotation body increases, the another movable member has a contact part which contacts the outer member, the contact part is formed of low friction material having lower friction coefficient than that of the other parts thereof, the contact part has a low friction region formed of low friction material and an elastic region formed of elastic material having lower stiffness than that of the low friction material, and the another movable member is provided to the inner member such that the outer member is in contact with both the low friction region and the elastic region when rotation of the rotation body is stopped.