一、问题的提出 在修理“东方红—30”过程中,差速器部分失效部位绝大多数都在行星齿轮和轴的接触部位。湖南拖拉机厂外修时亦经常碰到这个问题。而被修的拖拉机使用时间不长,按正常磨损是不会这样快失效的。 二、失效部位 轴和行星齿轮孔接触部位严重凸凹不平,呈瘤状,下部光滑,有熔化迹象。如图1。 First, the problem raised In the repair of “Oriental Red -30” process, the vast majority of the differential part of the failure are in the planetary gear and shaft contact parts. Hunan tractor factory repair often encounter this problem. The tractor is not used for a long time, according to the normal wear and tear will not be so fast failure. Second, the failure of parts Shaft and planetary gear contact hole serious uneven, was tumorous, the lower part of the smooth, there are signs of melting. Figure 1.