Piston ring set for reciprocating engines

  • US 5,779,243 A
  • Filed: 11/21/1996
  • Issued: 07/14/1998
  • Est. Priority Date: 11/21/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A set of rings for a piston of an internal combustion engine, a series of rings comprisinga split top ring including an annularly shaped resilient first member sized for confinement in and around a first radially outwardly opening annular groove formed in and around a surface portion of an internal combustion engine piston relatively near an upper end thereof, said first member projecting radially out of said first piston groove for slidably bearing against a surrounding engine cylinder wall, said first member forming a lap joint between a first end portion and a second end portion thereof, said first end portion having an inverted L-shaped structure defining a circumferentially extending notch in and along a lower outer surface portion thereof, said second end portion having an axial dimension sized for close fitting within and along said notch between an overlapping surface of said first end portion and a lower surface portion of said first piston groove and having a radial dimension which is less than the radial dimension of said notch for defining a fluid passageway between opposing axially extending surfaces of said first end portion and said second end portion, said passageway extending between and communicating with a downwardly opening slot between said end portions which is located at a first end of said lap joint and an upwardly opening slot which is located at a second end of said lap joint;

  • at least one split intermediate ring including a second annularly shaped resilient member sized for confinement in and around a second radially outwardly opening annularly shaped groove formed in and around a surface portion of said piston which is axially spaced below said first groove, said second member also being sized to project radially out of said second piston groove for slidably bearing against said cylinder wall, said second member defining an arc shaped outer surface for slidably bearing against said cylinder wall, wherein a first radial dimension of said second member, as measured in and along a plane containing a lower surface of said second member, is greater than a second radial dimension of said second member as measured in and along a plane containing an upper surface of said second member; and

    at least one split scraper ring including a third resilient annularly shaped member sized for confinement in and around a third radially outwardly opening annularly shaped groove formed in and around a surface portion of said piston which is spaced below said second groove and which is sized to project radially out of said third groove for slidably bearing against said cylinder wall, said third member including at least one radially outwardly projecting skirt defining an upper surface, an axially extending outer surface and a lower surface, said upper, outer and lower surfaces containing a continuous friction reducing outer coating having a thickness of from about 0.0005 inches to about 0.002 inches.

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