Abstract: An all-terrain vehicle is supported and driven by endless track units. Each track unit includes a drive belt with rows of interior drive lugs driven by cogs on multiple sprocket wheels of a common drive wheel assembly having an integrated, one-piece drum and hub. Multiple guide wheel assemblies engaging the lower run of the drive belt distribute the vehicle load across substantially the full width of the belt. Each guide wheel assembly includes a pair of guide wheel units mounted on opposite end portions of a common spindle and on opposite sides of a carrier beam of the track unit. Each guide wheel unit has a wide belt-engaging surface extending to, or close to, an edge portion of the belt and interrupted by an annular groove permitting passage of a row of the belt drive lugs while maintaining alignment of the belt and drive wheel assembly.

Abstract: An all-terrain vehicle is supported and driven by endless track units. Each track unit includes a drive belt with rows of interior drive lugs driven by cogs on multiple sprocket wheels of a common drive wheel assembly having an integrated, one-piece drum and hub. Multiple guide wheel assemblies engaging the lower run of the drive belt distribute the vehicle load across substantially the full width of the belt. Each guide wheel assembly includes a pair of guide wheel units mounted on opposite end portions of a common spindle and on opposite sides of a carrier beam of the track unit. Each guide wheel unit has a wide belt-engaging surface extending to, or close to, an edge portion of the belt and interrupted by an annular groove permitting passage of a row of the belt drive lugs while maintaining alignment of the belt and drive wheel assembly.

Abstract: An endless track unit for a tracked vehicle has guide wheel assemblies which support the track. A guide wheel assembly includes a hub adapted to be rotatably mounted on an axle, the hub having axially-spaced outer flanges of an outer diameter no greater than a first diameter. A central flange on the hub extends radially outwardly beyond the first diameter. A pair of outer axially-spaced wheels are mounted on the outer flanges and a central ring-like wheel having an inner diameter greater than the first diameter is secured to the central flange. The hub is generally an integral, or unitary, element adapted to be mounted on an axle and supports all three wheels. The wheels are substantially rigid rings, and each has an elastomeric covering formed about its periphery for cushioned engagement with the track.