초록 ▼

An improved low pressure seal ring configuration which is adapted for use in combination with a high pressure seal ring to provide a seal assembly which is capable of sealing first and second relatively reciprocating surfaces at both high and low pressures. The low pressure seal ring is designed to

An improved low pressure seal ring configuration which is adapted for use in combination with a high pressure seal ring to provide a seal assembly which is capable of sealing first and second relatively reciprocating surfaces at both high and low pressures. The low pressure seal ring is designed to be located between the high pressure seal ring and the wall of the groove in which the seal assembly is mounted. The low pressure seal ring exerts pressure against the high pressure seal to provide desired high pressure sealing. The low pressure seal also includes a seal lip which has a tip that extends over the edge of the high pressure seal to provide low pressure sealing. The low pressure seal assembly includes a seal body portion in which the radial width of the cross section of the seal body increases away from the sealing tip to provide increased biasing force against the high pressure seal ring and to provide adequate force against the tip of the low pressure seal ring to provide low pressure sealing without causing excessive frictional wear of the sealing tip.

대표청구항 ▼

A low pressure seal ring adapted for use in combination with a high pressure seal ring to provide a seal assembly which is capable of sealing first and second relatively reciprocating surfaces at both high and low pressures, wherein said high pressure seal ring includes an inner sealing surface for

A low pressure seal ring adapted for use in combination with a high pressure seal ring to provide a seal assembly which is capable of sealing first and second relatively reciprocating surfaces at both high and low pressures, wherein said high pressure seal ring includes an inner sealing surface for sealing contact with said first reciprocating surface and a low pressure seal ring support portion, said low pressure seal ring support portion including an outer low pressure seal ring support surface having an inclined seal lip support surface which tapers inward towards said inner sealing surface, said seal lip support surface having a left end which terminates at said inner sealing surface to provide a high pressure seal apex adjacent said first reciprocating surface and a right end, said low pressure seal ring support surface further including an axial low pressure seal body support surface which is substantially parallel to said inner sealing surface, said seal body support surface having a left end which meets the right end of said seal lip support surface, wherein said low pressure seal ring comprises: an annular seal ring body comprising: a seal lip portion having a bottom seal lip surface adapted to be supported by the seal lip support surface of said high pressure seal ring, said seal lip surface including an annular sealing tip at its left end said sealing tip extending out past and adjacent to the apex of said high pressure seal ring for sealing contact with said first reciprocating surface; and a seal body portion having a left part integral with said seal lip portion and a right part, said seal body portion further including an outer surface and an inner surface, said outer surface adapted to sealingly contact said second reciprocating surface and said inner surface adapted to be supported by the support surface of said high pressure seal ring, wherein said outer and inner surfaces diverge from each other from said seal body left part to said seal body right part to provide an increase in the radial width of the cross section of said seal body to thereby increase the compressive forces exerted on said seal body right part when said low pressure seal ring is positioned between said second reciprocating surface and said high pressure seal ring.