Patent ID: 7014278

Claim:
A drive assembly for a track vehicle having a track frame, an idler and a sprocket arranged substantially on a straight line, a plurality of track rollers disposed rotatably below the track frame, and a crawler made to run around the idler, the track rollers and the sprocket, the drive assembly comprising: single track roller units disposed at portions closest to the idler and the sprocket respectively, each single track roller unit having an a arm whose proximal end portion is attached to the track frame so as to rock, a track roller rotatably supported at a distal end portion of the arm, and an elastic member disposed between the arm and the track frame in a rotating direction of the arm; and a double track roller unit interposed between the single track roller units having a first arm whose proximal end portion is attached to the track frame so as to rock, a second arm whose central portion is attached to a distal end portion of the first arm, and a pair of front and rear track rollers rotatably supported on both distal ends of the second arm, wherein a pair of track frames is disposed on right and left sides of the track vehicle, each track frame having both the single-track roller units and the double track roller unit, and a vehicle body load is borne via the elastic member.