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Arrangement for sealing a rod

  • US 4,723,782 A
  • Filed: 06/16/1987
  • Issued: 02/09/1988
  • Est. Priority Date: 06/19/1986
  • Status: Expired due to Fees
First Claim
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1. In a hydraulic device comprising a wall separating a high pressure area from a low pressure area, an opening in said wall which has a cylindrical surface, an annular groove provided in said surface, an axially movable rod traversing said opening, said rod and the cylindrical surface of said opening defining an annular space, a sealing arrangement positioned in said annular space between said rod and said surface, said sealing arrangement comprising a sealing ring consisting of a tough-elastic plastic material including harder elastomeric materials and a stressing ring consisting of a softer elastomeric material, the two rings being acommodated jointly in said groove in such a manner that one end of their common contact face points towards the high pressure area, the stressing ring being retained in sealing relationship between the circumferential face of said groove and the outer face of the sealing ring at an initial radial stress resulting from a certain oversize, and the sealing ring being provided, on its inner surface facing the rod, with two axially offset annular sealing edges being in sealing contact with the rod, wherein the said sealing ring comprises at least one channel connecting the annular space between the sealing edges with its outer surface and each opening defined by the end of said channel in the outer surface is covered by the said stressing ring and located between the highpressure end and the center of the common contact face of the said sealing ring and the said stressing ring.

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