| 摘要 |
A ring seal assembly 20 is disclosed for reducing leakage about a part, such as a shaft or a piston cylinder having a surface of circular cross section. The assembly includes primary and secondary seal rings 22, 24, having radially inner and outer peripheral surfaces. The primary seal ring includes a radially extending gap 32 which permits the ring to expand. The rings are disposed in aligned, face-to-face contacting relationship, with the secondary seal ring being bonded to the primary seal ring at a point adjacent one side of the gap formed in the primary seal ring. The diameter of the peripheral surface of the primary seal ring, which is adapted to abut the circular surface of the part, substantially conforms to the diameter of the circular surface. The corresponding peripheral surface of the secondary seal ring includes a first portion or dam 40, which is aligned with the gap in the primary seal ring and has a curvature substantially conforming to the curvature of the primary seal ring. The remaining portion 42 of the peripheral surface of the secondary seal ring is undercut, relative to the peripheral surface of the primary seal ring. A biasing spring 36 is provided for urging the conformed peripheral surface of the primary seal ring into sealing relationship with the part such that leakage is reduced in both the axial and radial directions, while the part is permitted to radially expand.
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