| 摘要 |
PURPOSE: A crawler is provided to prevent a car body from ascending or descending by an obstacle on a ground surface. CONSTITUTION: A crawler comprises an endless track(21), a sprocket wheel(23), a supporting wheel(22), a "C"-shaped frame(24), multiple guide roller assemblies(30), multiple springs, the first cylindrical pipe, the second cylindrical pipe, a tension adjusting roller assembly(40) and a spring. The sprocket wheel is installed on the rear of a car body to drive the endless track. The supporting wheel is installed on the front of the car body to support the endless track. The "C"-shaped frame installed on a side surface of the car body and has multiple vertical long holes(25) on both side surfaces thereof with fixed gaps. The guide roller assemblies are installed to horizontally move by the vertical long holes of the frame to guide the movement of the endless track. The springs elastically bias downward the guide roller assemblies. The first cylindrical pipe accommodates the springs. The second cylindrical pipe is installed on the upper surface of the middle part of the frame and has guide pins installed on both sides thereof. The tension adjusting roller assembly is horizontally movably installed by the guide pins of the second cylindrical pipes to adjust the tension of the endless track. The spring is interposed in the second cylindrical pipe to elastically bias the tension adjusting roller assembly upward.
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