Abstract: A spherically sliding bearing unit generally includes an inner member having a first spherical surface, an outer member having a second spherical surface located opposite to and spaced apart from the first spherical surface, and a liner fixedly attached to the second spherical surface of the outer member to thereby provide a sliding interface between the liner and the first spherical surface of the inner member. The liner has a two-layer structure including an inner layer comprised of a resin material having a low coefficient of friction and an outer layer comprised of a metal. Preferably, the metal outer layer has an irregular structure, such as radial projections or grooves, such that a physically strong coupling can be provided between the liner and the outer member.

Abstract: A stud type track roller bearing includes a stud having an inner ring portion, a threaded portion and an intermediate portion therebetween. A flange formed with an inclined surface is provided at an end of the inner ring portion. An intermediate ring formed with a pair of oppositely inclined surfaces is fitted onto the inner ring portion in abutment with the flange and a side ring formed with an inclined surface is also fitted onto the inner ring portion in abutment with the intermediate ring so that a pair of inner guide grooves is provided on the stud. An outer ring formed with a pair of outer guide grooves is fitted onto the inner ring portion with a gap therebetween to define a pair of annular guide channels which are spaced apart from each other axially and provided with a plurality of rollers.