CRAWLER TYPE VEHICLE RUNNING DEVICE

摘要

Even if a crawler belt rides over a rock, the ground contacting length does not have to be reduced, thereby making it possible to improve the stability of a vehicle. Even if either of right- and left-hand crawler belts rides over a rock, an idler and a lower rolling wheel in the vicinity thereof are prevented from falling down, whereby the crawler belt is prevented from being greately twisted and damaged. To make this possible, there is provided a crawler type vehicle running device comprising left- and right-hand track frames supporting a vehicle body, driving wheels each supported on one end of each of the track frames, idler supports each supported on the other end of each of the track frames, piston rods adapted to be biassed by re-coiled springs so as to push out the idler supports, idlers supported by the idler supports, crawler belts passed around the idlers and driving wheels and lower rolling wheels for guiding the crawler belts, wherein the track frames (3, 4) are each formed in an inverted U shape and the idler supports (6, 6) are provided such that they are longitudinally slidably supported between guide members (12a, 12b) fixed inside two leg portions of the inverted U shape track frames. The idler supports (6, 6) have idlers (7, 7) rotatably supported thereon and first lower rolling wheels (10, 10) rotatably supported at positions adjacent to the idlers via brackets (18, 18).