一、回转机构静阻力的来源图1为挖掘机简图。正常作业时,底架相对地面静止不动,而回转机构绕中心0不断地往复回转。回转机构重量通过上环轨全部压在一组支辊上面,然后再由它把巨大压力传给下环轨。因为上下环轨及支辊都不是绝对刚体,所以当支辊相对上下环轨运动时,必定会出现纯滚动阻力。支辊所以能作圆周运动,是因为 First, the source of the static resistance of the slewing mechanism Figure 1 is a schematic diagram of an excavator. In normal operation, the chassis is stationary relative to the ground, and the swing mechanism reciprocates around the center 0 continuously. The weight of the slewing gear is pressed against the set of rollers by the upper ring rail, and then it transmits the great pressure to the lower ring rail. Because the upper and lower ring rails and the supporting rollers are not absolute rigid bodies, when the supporting roller moves relative to the upper and lower ring rails, pure rolling resistance will definitely occur. The roller can be circularly moved because