Patent ID: 6601664
Filing Date: 2003-08-05
Classification: B62D

Abstract:
A crawler device suitable for use on a crawler vehicle having a pair of crawler devices on at least one of a front portion of said vehicle and a rear portion of said vehicle, saidcrawler device comprising: a truck frame; a sprocket, being a driving wheel; at least one idler, being a driven wheel and being disposed on said truck frame; a crawler belt passed around said sprocket and said at least one idler as an endless loop; a front end link coupled to a forward portion of said truck frame by a pin located at a lower end portion of said front end link, said front end link being adapted to be coupled to a body side of the vehicle by a pin located at an upper end portion of said front end link; a rear end link coupled to a rearward portion of said truck frame by a pin located at a lower end portion of said rear end link, said rear end link being adapted to be coupled to said body side at a position behind said front end link by a pin located at an upper end portion of said rear end link; and a crawler belt tightening mechanism that is capable of providing tension to said crawler belt, wherein said crawler belt tightening mechanism comprises two upper rollers, which are rotatable in contact with an inner side surface of an upper portion of said endless loop, and which are respectively provided at two positions on said body side corresponding to positions at the forward and rearward portions of said truck frame with said sprocket between said two upper rollers.