EPICYCLIC FINAL DRIVE FOR TRACK-TYPE VEHICLES

摘要

A track-type vehicle comprises a track roller frame mounted on either side thereof and an endless track assembly mounted on each of the frames. An endless track assembly is entrained on the track roller frame and adapted to be driven by a sprocket operatively engaged therewith. The final drive for the sprocket comprises a rotatable input shaft having a sun gear secured thereon and meshing with a first set of planetary gears which react against a stationary first ring gear. Each gear of a second set of planetary gears is rotatably mounted on a rotatable carrier by a common shaft also having a respective gear of the first planetary gear set mounted thereon. The gears of the second planetary gear set mesh with a second ring gear rotatably mounted in the final drive and secured to the sprocket for simultaneous rotation therewith.