| 摘要 |
A two element, high and low pressure seal assembly to be used in a hydraulic or pneumatic sealing environment between two relatively movable machine parts, the seal assembly comprising an anti-extrusion spring element illustrated as generally rectangular in cross-section but including a projecting annular tongue and made of a relatively soft elastomeric material, the projecting tongue of said spring element contiguously engaging the entire surface of the base with the annular tongue being contained within an annular slot of a U-shaped elastomeric annular sealing member whereby the two member assembly functions jointly, and accommodates easy installation. The mating interface between the parts assure reliable unitary response but simultaneously provides a flex site at said interface which yieldingly resists imposed forces without fluid leakage. The U-shaped sealing element comprises a central body from which two anti-extrusion legs radially extend. The legs are located fore and aft of the tongue element within an annular peripheral groove in one machine part and are disposed perpendicularly or radially to the axis of said machine part. Projecting radially beyond said machine part is a convergingly tapered surface defining a central vertex or apex, said vertex creating a narrow contact dynamic seal area between the apex per se and the second machine part when the seal assembly is in said machine part groove and compressed between the two machine parts. The sealing member may project either radially inwardly or radially outwardly from the spring element. The axial dimension of the entire seal assembly is slightly smaller than the axial dimension of the machine groove thereby creating the mentioned dynamic narrow seal area between the apex of the sealing element and the second machine part, one static seal between the base of the anti-extrusion spring element and the base of the groove and between one radially directed sidewall of the machine groove and the contiguous anti-extrusion leg of the sealing element and one side wall of the spring element.
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