| 主权项 |
1. A sealing apparatus comprising:
a case having a hollow portion; a shaft passing through the hollow portion; and a sealing member configured to seal between the case and the shaft and divide the hollow portion into a first chamber and a second chamber, the sealing member including a resin ring and a ring-shaped rubber cap fitted on an outer periphery of the resin ring, wherein the rubber cap includes a ring-shaped base portion and a lip portion extending from an end of the base portion in an axial direction toward the first chamber; wherein the lip portion includes a first lip contacting the resin ring and a second lip configured to contact an inner peripheral surface of the case, wherein when a pressure of the first chamber is lower than a pressure of the second chamber, the second lip is separated from the inner peripheral surface of the case to relieve the pressure of the second chamber to the first chamber, wherein the base portion includes a first restricting surface for restricting the base portion from moving with respect to the resin ring toward the first chamber, and a second surface for restricting the base portion from moving with respect to the resin ring toward the second chamber, wherein the base portion includes a projection squashed by the inner peripheral surface of the case to generate a pressing force which presses the resin ring to the shaft when the seal member is disposed between the case and the shaft, wherein a slit axially extends through the projection so that the first chamber and the second chamber are in fluid communication with each other via the axially extending slit when the pressure of the first chamber is lower than the pressure of the second chamber, and wherein the resin ring has a wall extending in a radial direction of the shaft, a radially outermost surface of the wall being higher in the radial direction than every topmost portion of the first lip. |
