Compound rim assembly for idler in an undercarriage system of a track-type machine

A remanufactured idler for an undercarriage system in a track-type machine comprising:

• a hub including an outer peripheral surface, an inner peripheral surface defining an idler mounting bore, and a compound rim assembly mounted upon the hub, the compound rim assembly including a first annular track contacting rim, a second annular track contacting rim, and a track guiding ring;
• a weld attaching the compound rim assembly to the hub;
• the hub being formed of a relatively lower hardness metallic material, the first and second annular track contacting rims being formed of a relatively higher hardness metallic material, and the track guiding ring being formed of a non-metallic material;
• and
• the track guiding ring being trapped axially between the first and second annular track contacting rims, and projecting radially outward of the first and second annular track contacting rims;
• wherein the weld includes a first circular edge weld, and further comprising a second circular edge weld;
• wherein the compound rim assembly further includes a one-piece annular base mounted upon the outer peripheral surface, and wherein the first and second circular edge welds attach the one-piece annular base to the hub.

An undercarriage system for a track-type machine comprising:

• a ground engaging track including a plurality of track shoes, a plurality of track links coupling together the track shoes in an endless track chain, and a plurality of track pins coupled with the track links;
• an idler for the ground engaging track including an idler body having a hub formed of a relatively lower hardness metallic material, and a compound rim assembly mounted upon the hub, the compound rim assembly including a first annular track contacting rim, a second annular track contacting rim, and a track guiding ring;
• a weld attaching the compound rim assembly to the hub;
• the hub being formed of a relatively lower hardness metallic material, the first and second annular track contacting rims being formed of a relatively higher hardness metallic material, and the track guiding ring being formed of a non-metallic material;
• and
• the track guiding ring being trapped axially between the first and second annular track contacting rims, and projecting radially outward of the first and second annular track contacting rims such that the track guiding ring contacts the plurality of track pins;
• wherein:
• the compound rim assembly includes a one-piece annular base having a cylindrical inner surface interference fitted upon the hub, and a cylindrical outer surface;
• each of the first and second annular track contacting rims are interference fitted upon the cylindrical outer surface;
• and
• the weld includes a first circular edge weld, the idler further including second circular edge weld, and the first and second circular edge welds attaching the first and second annular track contacting rims to the one-piece annular base, respectively.