| 摘要 |
PURPOSE: To suppress the reduction of the interferences at the outer periphery side and the inner periphery side, and to prevent the reduction of the sealing property owing to a temperature variation, by setting the thermal conductivity of an outer periphery adhesive means larger than that of the inner periphery adhesive means, in the seal of a sealing device. CONSTITUTION: While an oil seal 18 is formed in a U-shaped section form by forming a circular groove 20, a fitting member 22 as an outer periphery adhesive means, and a seal lip 24 as an inner periphery adhesive means are provided respectively. And to the oil seal 18, a metallic circular member 26 is buried integrally. Furthermore, to the inner wall surface of the groove 20, a half circular arc groove 28 is formed, to which a coil spring 30 is inserted. And, the outer periphery side and the inner periphery side in the diameter direction of the oil seal 18 are formed of rubber form elastic bodies 32 and 34 respectively. In this case, the thermal conductivity of the outer periphery side rubber form elastic body 32 is set larger than that of the inner periphery side rubber form elastic body 34. Consequently, while the expansion of the outer diameter size at the initial phase of the temperature rise is made faster, the expansion of the inner diameter size is made slower. |
