Xu Jifu, Hexi County Agricultural Machinery Management Station, Tahe County, Heilongjiang Province Zhang Jifeng, the ten-station agricultural machinery management station in Tahe County, Heilongjiang Province, is taking the Dongfeng 914, a type of automobile as an example. The main reducer of the vehicle adopts single-stage hyperbolic still-wheel drive and runs smoothly. The low noise is caused by the load of the reducer. If the maintenance is improper, it will cause wear and shorten the service life. Now its frequent faults and adjustments are described as follows. The reason for the oil seal leakage is that the oil seal is invalid, or the method of disassembling the oil seal is incorrect, resulting in damage to the oil seal and leakage.
Premature wear of the final drive gear causes premature wear of the gear. Some of the lubricant specifications are incorrect or the lubrication caused by other original flashes is poor. When the main reducer gear is in operation, due to its transmission characteristics, there is not only rolling between the teeth, but also longitudinal slippage, so that the pressure between the tooth surfaces is increased, and it is difficult to form a good lubricating oil film. The hyperbolic gear oil with high oil injection film strength cannot guarantee the normal lubrication of the gear, resulting in shortened gear life.
The connecting bolt of the differential case and the driven gear of the final drive is loose. The rear axle differential case of the vehicle and the driven gear of the final reducer are bolted. When the vehicle advances, the force of the driven gear is applied, and the gear is close to the bolt of the force point, so that the gear is stressed. The bolts at the place are loose. When the pre-tightening force of the bolt is insufficient, most of the bolts on the circumference of the driven gear are gradually loosened, and the gears are swayed and impacted during operation, thereby seriously damaging the meshing surface of the main reducer of the final drive gear and the meshing clearance, so that the main reducer The gear was damaged early.
The gear meshing surface is incorrect and the tooth side clearance is too small. The small end of the main reducer gear gradually moves to the big end, the rest of the tooth is not subjected to load, and the heart is concentrated at the big end of the tooth, which aggravates the wear of the gear and even breaks the tooth.
The original flash generated by the premature failure of the 42307 rear bearing of the driving gear is that the pre-tightening force of the bearing is insufficient, the axial clearance of the driving gear is too large, or the bearing hole is deformed.
1. The main reducer gear pair of the final reducer is ground in the pair during the manufacturing process, and the tooth surface contact area is strictly inspected, so the pair of gears should be selected. When assembling the assembly, the driving bevel gear with the pre-tightening of the bearing should be installed in the correct position before installing the passive wheel. And adjust the tooth surface engagement marks according to the requirements of the repair specifications, so that the gears are evenly distributed and prolong their service life.
The adjustment of the main reducer gear meshing mark adjusts the force of the imprint. The 3,4 joints uniformly distributed along the circumference of the passive bevel gear are coated with the paint turning gear with a smaller grain size than the river (1). The test mark is correct or not. Increase or decrease the adjustment gasket so that the driving bevel gear moves back and forth, changing the position and size of the meshing imprint. The correct imprinting footprint is the Min Can wide 79 claw, which is lower than the 0.88 claw of the tooth top, and the small end of the gear is 351. When the reducer is working at full load, the gear contact area will move the gear end. Therefore, the position of the print may be slightly smaller than the gear size when adjusting, and there should be a fixed gap between the gear pair teeth. It compensates for the assembly error and the deformation of the elastic expansion and the force 1 to prevent the gear from being stuck or ablated when rotating.
Adjusting the meshing clearance should be realized by moving the left and right positions of the flashing wheel under the condition of correctly engaging the imprint, and not moving the active one-wheel. The correct meshing clearance is 0.50.40. Some repairers mistakenly adjust the feeding gap by changing the front and rear positions of the driving gear. The result is that the meshing gap contains 7 requirements, but the tooth meshing position changes in the tooth width direction. Caused the deterioration of the street rotation conditions. Therefore, when assembling the assembly, it is required to adjust the meshing position before adjusting the meshing clearance.
The adjustment of the bearing pre-tightness Dongfeng, the load of the 40-speed reducer drive gear bearing is very large, so the drive gear is required to have a higher support stiffness, and the bearing should be pre-tensioned to eliminate the axial clearance. To prevent the axial displacement of the driving gear due to the increase of the axial impulse, and to ensure the correct meshing of the gears.
When adjusting the pre-tightening of the bearing, do not install the oil seal first, state 1 245! The torque of the flange nut is tightened, and then the fork flange is pushed hard. When the wide axial clearance is exceeded, the gasket of the inner ring of the two tapered roller bearings should be adjusted, and then the fork flange can be rotated with a torque of 0.98471. If the pre-tightening force is too large, the bearing load will increase, and the temperature will increase and the service life will be shortened sharply.
4. Adjusting the clearance between the bolt and the driven gear The clearance of the passive gear of the support bolt should be 0.30.5, which is called the gap is too large, so that the support stiffness of the wheel is reduced, and the gear of the passive gear bead is connected. When the looseness is caused for 4 weeks, the support bolt is screwed to the back of the driven gear, and then retracted, 14 and adjusted, the lock nut is tightened, and the lamp is locked with a lock piece. U3
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