Track joint with a thrust ring and a seal ring

Claim 1

A track joint with a thrust ring and a seal ring, comprising a track pin, a cylindrical bushing on said pin and terminating in an annular surface disposed on a plane transverse to the extent of and within the length of said pin, a track link on the end of said pin and having an annular surface, said annular surfaces being spaced apart and faced toward each other and extending radially from and beyond said pin on respective planes transverse to the longitudinal axis of said pin, a thrust ring of rigid material fitted on said pin between and in abutting contact with said annular surfaces at the radially inward portions of said annular surfaces for maintaining said bushing and said link spaced apart, and an elastomer seal ring extending around said thrust ring in snug endless circular contact therewith and radially outwardly therefrom and being disposed completely in the space between said annular surfaces, mated projections and notches on said thrust ring and said seal ring at the snug contact therebetween, for securing said seal ring on said thrust ring, said seal ring having an annnular body portion and two radially outwardly extending legs having a radial extent less than that of said annular surfaces to be disposed within the radial limits of said annular surfaces, said legs having circular edges at the axially opposite ends of said seal ring and with said circular edges being in respective compressed contact with said annular surfaces for sealing therewith, said circular edges being spaced radially inwardly from the radial outer limit of said seal ring and being disposed on respective planes beyond the planes of the axial ends of said thrust ring, in the free body condition of said seal ring, for effecting the compressed contact with said annular surfaces.