Common faults and troubleshooting of HOWO middle axle main reducer assembly and rear axle main reducer assembly

Inter-axle differential damage analysis:

The inter-axle differential (inter-axle differential) of an automobile is a component that ensures the differential movement of the middle and rear axles. If the inter-axle differential fails, the middle and rear drive shafts become rigidly connected, which will lead to a series of failures during operation. When the vehicle turns, the rolling distances of the wheels of the middle and rear axles are inconsistent. Due to the failure of the inter-axle differential, the differential rotation can no longer be performed, which will cause the tires to slip, and the reduction gear in the drive axle will increase the additional load. Gear teeth are easily fatigued and broken.

When the vehicle is stuck in the mud, if one wheel is idling and the inter-wheel differential lock is attached, the load of the entire vehicle will be concentrated on one drive axle, and the load will be too large for a single drive axle to bear, which will lead to the reduction gear teeth of the reducer. broken, interrupted.

The inter-axle differential is an indispensable part. The failure in use is mainly due to the damage of the planetary gear, and the cause of the damage is mostly poor lubrication. The inter-axle differential is located at the top of the front end of the middle axle. It is mainly lubricated by the splash oil of the middle axle reducer gear. Due to the high position of the inter-axle differential, less oil splashes when the vehicle runs at low speed, and the lubrication conditions The difference causes damage to the inter-axle differential. Especially when the oil level is low, it is more likely to cause the failure of the inter-axle differential.

The following methods can be used to judge the sound of the drive axle:

If there is continuous noise during driving, stop the vehicle for inspection. If the drive axle housing is hot, it may be caused by too small gear meshing clearance during installation; if the heat is serious, it is caused by lack of oil. The oil level should be checked in time, and if it is less, it should be added.

During driving, if the drive axle makes a rhythmic impact sound, most of it is caused by the excessive meshing clearance of the gears, and the meshing clearance should be adjusted.

When the vehicle is running, the sound emitted by the drive axle increases with the increase of the vehicle speed, and decreases or disappears when sliding, which is caused by bearing wear. If the speed changes suddenly or the car makes noise when going uphill, this is due to the excessive gear meshing clearance and should be adjusted.

When the vehicle is driving on a curved road, the drive axle makes a noise; while driving in a straight line, the noise decreases or disappears, which is caused by the excessive backlash of the differential planetary gear teeth, or the wear of the side gear and the side shaft splines.

After the drive axle is deformed, the noise is particularly loud, the tires also make noise, and there is also the friction of the gears in the wheel reducer. The sound is harsh and the tires will be eccentric. When the drive axle is running for 300,000 km, the meshing clearance of the gears and the usage of the bearings should be checked by random sampling. The sampling should be checked once at 400,000 km, and then every 50,000 km, in order to ensure the normal meshing clearance of the gears and ensure safe operation. The deformation of the drive axle housing should be dealt with in time.

Adjustment of the meshing clearance of the active and passive gears of the reducer:

When the final reducer is a single-stage reduction bevel gear pair, the clearance must complywith the regulations. In order to make the bevel gear pair work normally, in addition to havinga good contact area between the gear tooth surfaces, it is also necessary to have a propermeshing clearance between the gear teeth.This is because the lubrication of the gear teethand the flexible, impact-free, noise-free meshing operation of the gear teeth depend on theproper clearance. lf the clearance is too small, an oil film of a certain thickness cannot beformed between the tooth surfaces, which will deteriorate the lubrication and cooling of theworking surface of the gear teeth, generate noise and heat during operation, and aggravate

the wear and abrasion of the tooth surfaces of the gear teeth, even lt willcause the gear teeth to be stuck and broken; when the clearance istoo large, the gear tooth surface will generate impact load, destroy the oil fim, and when the vehicle speed or load changes sharply, there wilbe impact noise, which will also aggravate the wear of the tooth surface. , which can break the gear teeth.

The size of the meshing clearance of the gear teeth depends on the modulus of the end face of the gear teeth and the working conditions.The meshing clearance of the bevel gear pair of the drive axle reducer should be controlled within 0.2-0.3mm.The meshing marks should bechecked when installing the bevel gear pair.

Reasons for the damage of the drive axle wheel reducer:

The main reasons for the serious wear of the gear train of the wheel side reducer are the lack of lubricating oil the deterioration of thelubricating oil and the deformation of the drive axle.The reasons for gear wear are as follows:

The lubrication of the wheel reducer is self-contained, and it should be checked and added frequently. The amount of oil on each side of thewheel reducer is 2L. if the wheel reducer is short of oil, the oil level is insuficient,resulting in insuificient gear lutbrication. The operation of theplanetary ring gear and the working surface of the planetary gear cause serious wear. The oil level is insuficient, the planetary gear journaland the inner hole of the planetary gear are worn, the bearing is damaged, and the tooth surface of the planetary ring gear is also worm.

Due to various reasons, the drive axle is bent and deformed, which destroys the meshing clearance of each gear of the wheel side reducerand causes gear wear.

When the wheel side reducer is working, the half shaft drives the sun gear to rotate. when the differential speed is not available, thedifferential planetary gear rotates and rotates together around the sun gear and the planetary gear. Due to the bending deformation of thedrive axle, the normal meshing clearance between the sun gear and the planetary gears i destroyed,resuting in serious wear of the workingsurfaces of the sun gear, planetary gears and planetary ring gears. Due to the deformation of the drive axle, the change of the position of thesun gear and the abnormal meshing of the planetary gears, the clearance of the journals and bearings of the planetary gear shafts is changedand damaged.

The processing quaity and instlation quality of the wheel side reducer gears have caused serious wear on the gear tooth surfaces.

In order to ensure the normal operation of the wheel reducer,the oil level of the wheel reducer should be checked every time the first-levelmaintenance is performed, and the oil level of the wheel reducer should be replenished in time. The gear room should be cleaned and the oichanged every 12,000km of secondary maintenance. lf the wheel oil seal(190*220*5) is damaged .it should be replaced in time to preventdamage due to lack of lil in the wheel reducer.Do not add too much oil Adding too much will cause high temperature, whic will deterioratethe lubricating oil and damage the gear. It is better to add it to the normal position.

Be careful when assembling the wheel reducer assemblyit according to the regulations to prevent the gap from changing.