Patent ID: 7036894

Claim:
A tandem drive system for a tracked vehicle having a main track longitudinally extending in a closed endless main loop on opposite sides and engaging a separate main drive sprocket assembly, extending under roadwheels to a main drive idler wheel, and back to said main drive-sprocket assembly in said main loop, each main track having an inboard face on an inward facing inner surface said tandem drive system comprising: a secondary track engaging each main drive-sprocket assembly and extending forward along the tracked vehicle from each main drive-sprocket assembly under only an aft-most fractional portion of the roadwheels, each secondary track being configured as a closed endless secondary loop inside of said main loop of each main track, and each secondary track being adjacent to and laterally extending across the inboard face of a separate main track where said main and secondary tracks are wrapped around each main drive-sprocket assembly.