UNDERCARRIAGE TRACK ROLLER HAVING ASYMMETRIC SHELL WITH OIL GROOVES AND ROLLER SHAFT FOR SAME

A track roller for an undercarriage system includes a roller shell with a first inner surface forming a larger diameter shaft bore and a second inner surface forming a smaller diameter shaft bore coaxially arranged with the larger diameter shaft bore. A roller shaft having a first shaft end and a second shaft end supports the roller shell for rotation and has an oil reservoir formed therein. A first sleeve bearing and a second sleeve bearing are positioned upon the roller shaft, and an axially extending oil passage is formed by the second inner surface of the roller shell forming the smaller diameter shaft bore and an outer bearing surface of the second sleeve bearing. The oil reservoir in the roller shaft is confined in its extent to the second shaft end of the roller shaft.