Patent ID: 7025429

Claim:
A drive assembly for a track-type vehicle having a track frame and an idler and a sprocket arranged generally on a straight line, a plurality of track rollers disposed rotatably below said track frame, and a crawler made to run around said idler and said track rollers and said sprocket, said drive assembly comprising: a single track roller unit disposed closest to said idler and closest to said sprocket respectively, said single track roller unit supporting said track roller rotatably at the distal end portion of an arm attached at its proximal end portion rockably to said track frame, and said single track roller unit bearing a vehicle body load at the distal end portion of said arm through elastic members; and a double track roller unit interposed between said single track roller units and including a first arm attached at its proximal end portion rockably to said track frame, and a second arm attached at its central portion rockably to the distal end portion of said first arm, for supporting the paired front and rear ones of said track rollers rotatably at the two end portions of said second arm.