| 摘要 |
PCT No. PCT/US79/00844 Sec. 371 Date Oct. 15, 1979 Sec. 102(e) Date Oct. 15, 1979 PCT Filed Oct. 15, 1979 A joint sealing structure (19,119,219) for use in sealing relatively axially movable members (11,14) of a joint (10) over a wide range of such axial movement. The sealing structure includes a seal ring (20,120,220) having a sealing lip (21,121,221) having a maintained dynamic seal with a sealing surface (22) of one of the joint members. A stiffener (23,123,223) is provided for transferring biasing force from a spring means (29,129,229) to the sealing lip. The stiffener may be provided with a flexible connecting portion (27,127,227) permitting free movement of the sealing lip under the biasing action of the spring means over the range of movement between the joint members. In one form, a base (28) may be provided to which the connecting portion (27) is mounted, the base being fitted into the counterbore 817) of the joint member so as to provide a static seal therebetween. The base may be provided with a turned flange for carrying the outer portion (33) of the spring (30) for free movement of the spring means in maintaining the biasing action. The spring means may comprise Belleville spring means arrangement to pass over center over the range of movement of the joint members so as to provide an effectively constant spring biasing force to the sealing lip.
|
