Patent ID: 7370865

Claim:
An assembly comprising: a wheel defining a wheel cavity defined by an inner cylindrical wall having a predetermined diameter; and a face seal including a rigid sealing ring and a flexible ring disposed on the sealing ring, the flexible ring having a trapezoidal shape and including an outermost substantially cylindrical surface defining a maximum diameter of the ring, the flexible ring sized so that in a relaxed state outside of the wheel cavity the maximum diameter of the flexible ring is slightly larger than the diameter of the wheel cavity, wherein the face seal is retained within the wheel cavity, by an interference fit of the flexible ring against the inner cylindrical wall defining the wheel cavity, the interference fit having been achieved by application of a force against only an outer edge of the flexible ring adjacent to the outermost substantially cylindrical surface and substantially evenly therearound in an axial direction toward the wheel cavity, such that the diameter of the ring was reduced so as to be equal to or less than the diameter of the inner cylindrical wall to allow the flexible ring to be inserted into the wheel cavity, and removal of the force.