| 摘要 |
A radial seal ring has a frame or reinforcement, a body of an elastomer, and a seal lip of a low friction material such as a fluorine containing resin, particularly PTFE, adhered to the body. The seal lip extends radially of the body to provide a portion unadhered to the body and which has an annular recess in the surface thereof which faces toward the body. The recess is located adjacent to a peripheral edge of the body and defines a controlled region of deflection of the lip seal. The annular recess is formed during molding by pinching a preformed disc of the lip seal between an annular rib of the mold and an opposed surface of the mold.
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