Attention maintenance loader drive axle

Drive axle repair loader considerations - 2021 02 - 18 Huang Zushun ( Dexing copper mine in jiangxi province transportation department north team) Adopt all-wheel drive loader, the front and rear axles have the same shape, size, internal structure. In repair or purchase spare parts if we do not pay attention to distinguish, there will be assembling error, loader walking shiver, pulling the hysteresis phenomenon, parts in the early damage. Brother repair according to the practice of maintenance, that something that should be paid attention to about maintenance loader drive axle. 1. Before and after the main reducer bevel gear drive axle XuanXiangYing opposite loader is mainly composed of differential and the main reducer, before and after the drive axle differential internal structure, the same parts can be universal. Before and after the drive axle of main reducer is different, can't general. Before and after the Lord of the drive axle of main reducer, the driven bevel gear adopt spiral bevel gear, spiral bevel gears of the main difference is the main reducer screw rotate to the opposite. With liugong ZL40, 50 loader as an example, its front axle spiral bevel gear driving screw direction for left-handed, the direction of the driven spiral bevel gear for a right-handed, rear axle, on the other hand. Loader main reducer structure as shown in figure 1. Loader loading and unloading operations should be forward or backward, forward, driven bevel gear load is big, back when the load is small. Loader, active bevel gears rotate clockwise ( From the loader rear look forward) , its force surface of normal force can be decomposed into axial force and radial force and tangential force. The active bevel gear axial force was studied by active small bevel gear to bevel heel, the force through the big taper roller bearing on the speed reducer shell, can withstand larger axial force. When the loader backwards, active bevel gear counterclockwise ( From the loader rear look forward) , the axial force and tangential force the reverse and forward. Can be seen from the force, active bevel gear axial force through the role of the lock nut active bevel gear shaft on small taper roller bearings, small taper roller bearing capacity is small, easy to damage. If choose the main, driven bevel gear pair to the error, will cause the gear rotate to the contrary, lead to the stress of the loader when forward what it was in the back. Loader forward, driven bevel gear bearing capacity than backward when carrying capacity, if the load is too large, will cause the lock nut loose kuang, lead to small taper roller bearing loose kuang. That small taper roller bearing not only bear a large axial force, and bear part of the tangential force and radial force impact, this is bound to reduce before and after the service life of the gear reducer. Maintenance personnel if neglected the difference between front and rear axles of main reducer, maintenance, replacement of the main reducer assembly or the main, driven bevel gear pair, will be before and after the wrong drive axle of the main reducer. So although after assembly loader can drive, but will make greatly shorten the service life of main reducer. 2. Main reducer ratio should be consistent when the drive axle repair, need to change the new main reducer assembly, or the main, driven bevel gear, if the new main reducer and driven bevel gear teeth and gear teeth old not equal, will cause before and after reducer ratio is different, lead to damage of main reducer gear. Loader between front and rear axles through before and after the shaft connected to the transmission. No differential mechanism between before and after the shaft, as a rigid connection. If before and after reducer ratio is different, the length of the front and rear axle tire rolled is not the same. Before and after the shaft is rigid connection, when the loader driving if produce drag lag between front and rear tires, will cause the loader driving resistance increase, little gas can't drive, can't work normally. Maintenance personnel in the maintenance of main reduction, not only pay attention to the helical bevel gear, note also that the number of teeth on the tooth, in order to make sure the drive axle ratio before and after. 3. Wheel reducer assembly mark should aim at into work ZL20, ZL30 wheel loader and reducer ratio is larger, round edge of the planetary gear speed reducer adopts duplex structure, namely the outer planets and outer gear ring gear meshing, the inside of the asteroid gear and ring gear meshing. Repair if there is no according to the symbols on gear and internal gear ring for assembly, assembly is bound to increase the difficulty, even can't assembly. Also can produce even assembly, loader driving trembling, drag hysteresis phenomenon. The correct assembly method is: will assemble the duplex planetary gear ring gear inward, when installation should pay attention to three dual planetary gear of big gear mark out, at the same time, only the big gear tooth alignment of the sun gear addendum, will double in the circle of pinion load internal tooth planetary gear. As workers loader wheel reducer assembly marking as shown in figure 2. Only in this way can we guarantee the sun gear assembly, and three dual planetary gear meshing correctly, to ensure that loader riding without trembling, drag hysteresis phenomenon. Source: engineering machinery and maintenance 04, 2016