1, the car driving certain mileage on a flat surface, the rear axle temperature rises to normal, then when the vehicle abnormal noises, down speed, parking, the transmission is in neutral position, and then slowly until the engine speed is accelerated, and the abnormal sound when the speed is when observing any abnormal sound occurs, can be repeated several times, to determine whether the engine exhaust noise or abnormal condition caused by.
2 、 the separation of tire noise and rear axle noise
The tire noise changes with the road, but the noise of the rear axle is not. When the speed of the car is below 48km/h, the noise of the rear axle disappears, while the tire noise persists. The noise of a car moving and sliding is the same, but the noise of the rear axle is different.
3, wheel bearings, abnormal sound and the noise of the bridge after the resolution
When the car is running and sliding, noise bearing unchanged, such as keep the speed constant and apply brake, the wheel bearings reduce part load, which can reduce the noise, you can find out where the noise comes from.
When the speed is more than 48km/h, unless the rear axle was seriously damaged, general rarely heard noise of the rear wheel bearing, automobile sliding or neutral, rear wheel bearing crack will have a “rumble” sound, while the rear wheel bearing erosion was issued a “rustling” sound.
4, the reducer cone active bearing and differential bearing differential sound resolution
Baotou North rush heavy truck parts reducer bearings usually produce a harsh “rumble” sound or “rattle” sound, sound beat stability, with the speed change.
The bevel driving gear of the reducer, the front axle bearing sound is larger when the car is sliding, and the noise of the rear bearing is larger when driving.
The noise of the differential bearings of the North Baotou heavy truck fittings is usually a constant noise, but its beat is much more moderate than the noise of the reducer’s cone drive gear bearings.
5 、 the resolution of the rear axle gear noise
When driving in a normal line, there is little relative motion between the differential shaft gear and the planetary gear, so noise is not heard.
In the process of driving causes of rear axle gear knock occurs mostly by poor lubrication caused by, resulting in gear grinding scars, if can hear abnormal noise in various sliding speeds, that is caused by the driving gear reducer nut loose.
At low speed, knocking occurs at the back of the bridge, and when it accelerates or slows down, it makes a particularly dull and abnormal sound. The above faults may be traced from one or more of the following places:
The gap between the differential gear shaft journal and the differential case is improper.
Improper matching between the differential cross shaft journal and the differential case.
Improper clearance between the half axle spline gear and differential shaft gear keyway.
The meshing backlash between the differential gear and the planetary gear is improper.
Baotou North rush heavy truck parts, differential cone, active and passive gear meshing, improper backlash.
The thrust washer wear.
When the vehicle is moving, the rear axle causes abnormal noise because of improper meshing of gears, differential preload of differential bearings, or both. When the abnormal sound is excluded, the meshing clearance between the differential gear and the reducer gear shall be checked and the preload of the reducer cone drive gear bearing and the contact trace of the gear of the reducer shall be checked.