Patent ID: 8465110

Claim:
A rotatable track engaging element, for guiding or driving a ground engaging track having first and second chain assemblies including track pins received in bores formed in inboard track links, bushings positioned on the track pins, and inner track seals positioned in the bores and being adjacent to exposed seal regions of the inboard track links facing a track guiding space, the rotatable track engaging element comprising: a body defining an axis of rotation and including an inner diameter surface, an outer diameter surface, and first and second axial sides extending from the inner diameter surface to the outer diameter surface, the body further having a contact interface including seal protecting wear surfaces positioned on each of the axial sides; each of the axial sides includes an outboard surface extending a first radial distance from the corresponding seal protecting wear surface to the outer diameter surface, and an inboard surface extending a second, greater radial distance from the corresponding seal protecting wear surface to the inner diameter surface; and wherein each of the inboard surfaces includes a lower axial elevation, each of the outboard surfaces includes a middle axial elevation, and each of the seal protecting wear surfaces includes a higher axial elevation; and wherein each of the first and second axial sides further includes an axially protruding step, and each of the axially protruding steps includes, a face whereupon the seal protecting wear surface is located, disposed at a non-perpendicular face angle relative to the axis of rotation and being formed of a sacrificial wear material, whereby the contact interface directs contact between the body and the inboard track links away from the exposed seal regions during operating the ground engaging track.