ZL40/50型装载机采用行星式变速器，零部件结构比较复杂，在系统传动过程中容易产生噪声，特别是在I挡和倒挡部位，这是由设计结构所造成的。I挡和倒挡均采用行星轮系结构，其行星排由太阳轮、行星轮、行星架和齿圈四元件组成。如图1所示，带有两个行星排的太阳轮通过花键与输 ZL40 / 50 loader planetary transmission, parts and components more complex structure, the system is easy to produce noise during transmission, especially in the I block and reverse gear parts, which is caused by the design structure. I block and reverse gear are used planetary gear train structure, the planet row by the sun gear, planetary gear, planet carrier and ring gear four components. As shown in Figure 1, a sun gear with two planetary rows is splined and lost