| 主权项 |
1. A compound rim assembly for a rotatable idler in an undercarriage system of a track-type machine comprising:
a one-piece annular base configured for mounting the compound annular rim assembly upon an outer peripheral surface of an idler hub, the one-piece annular base being formed of a relatively lower hardness metallic material, and having a cylindrical inner surface defining a center axis, a cylindrical outer surface concentric with the cylindrical inner surface, and a first and a second axial end surface; the one-piece annular base further including an axial thickness between the first and second axial end surfaces, and a radial thickness between the inner and outer cylindrical surfaces, the radial thickness being less than the axial thickness; a first annular track contacting rim positioned upon the outer cylindrical surface at a location adjacent the first axial end surface, and a second annular track contacting rim positioned upon the outer cylindrical surface at a location adjacent the second axial end surface, each of the first and second annular track contacting rims being formed of a relatively higher hardness metallic material and being welded to the one-piece annular base; and a track guiding ring trapped axially between the first and second annular track contacting rims and abutting the outer cylindrical surface of the one-piece annular base, the track guiding ring being formed of a non-metallic material and projecting radially outward of the first and second annular track contacting rims. |
