Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1986-05-30
1988-05-31
Levy, Stuart S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277188A, F16J 1532
Patent
active
047476052
ABSTRACT:
A fluid pressure seal assembly is adapted to accomodate high and low pressure conditions in hydraulic oil environments. In a preferred form, the seal assembly includes a primary shaft sealing annulus having a radially inwardly extending circumferential sealing lip defined by a pair of outer and inner converging frustoconcial walls. During a low pressure mode, the sealing lip provides contact with the shaft being sealed. During a high pressure mode, the inner frustoconical wall provides a surface contact with the shaft. A rigid metallic support component is disposed for limiting axial movement of the annulus, the support component being a part of a steel J-casing which structurally supports a body of elastomer bonded thereto. In a preferred form the support component of the casing member is encased by a portion of the body of elastomeric material to form a barrier which limits the amount of high pressure deformation of the sealing annulus. Also, in a preferred form the sealing annulus is spaced from the barrier during low pressure sealing conditions, whereby a gap is defined between the primary sealing annulus and the barrier. During high pressure sealing, the gap is closed as the sealing annulus is forced against the barrier and the inner frustoconical wall makes surface contact with the shaft.
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Dana Corporation
Hannon Thomas R.
Levy Stuart S.
McDonald F. B.
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