| 摘要 |
PCT No. PCT/GB87/00705 Sec. 371 Date Apr. 7, 1989 Sec. 102(e) Date Apr. 7, 1989 PCT Filed Oct. 5, 1987 PCT Pub. No. WO88/02454 PCT Pub. Date Apr. 7, 1988.A shaft seal comprises a rigid case ring 1 and a sealing ring which has a PTFE or like ring component 4 secured in the case ring by a molded elastomeric ring component 5 molded into and face-bonded to the case ring, to secure the PTFE ring component in place, and having elastomeric material 7 extending over the air side face of the PTFE ring component, toward a sealing periphery thereof, and forming the wiping seal. Optionally, the elastomeric material is molded into a hydrodynamic, positive sealing configuration of ribs or grooves 8.
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