Diagnosis of the abnormality of the chassis of several cars

Source: Bearing network time: 2013-02-12

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The resolution of engine abnormal noise and rear axle noise firstly travels the car on a flat road for a certain distance; the working temperature of the rear axle rises to normal; then when the car travels to announce abnormal noise; record the speed; after parking; Set the transmission in neutral position; then slowly accelerate; until the engine speed is the same as the speed when the abnormal sound is present; investigate whether there is an abnormal sound; can repeat several times; to determine whether the abnormal sound can be exhausted or Induced by the abnormal condition of the engine.
The tire noise of the tire noise and the rear axle noise changes with the road surface; the rear axle noise is otherwise. When the speed of the car is lower than 48km/h; the rear axle noise is not seen; and the tire noise persists. The car is on the road. And when taxiing; the noise of the tire is the same; but the noise of the rear axle is different.
The difference between the abnormality of the hub bearing and the noise of the rear axle is when the vehicle is traveling and coasting; the noise of the front wheel bearing is constant; if the vehicle speed is kept unchanged, the brake is slightly applied; the wheel load bearing can be reduced to some load; then the noise can be weakened; You can see where the noise source comes from.
When the vehicle speed is greater than 48km/h; unless the rear axle is severely damaged; in general, the noise of the rear wheel bearing is rarely heard; when the car is taxiing or neutral; the cracked rear wheel bearing will have a "long-halogen motion; and the erosion The rear wheel bearing announced the "shasha" movement.
The differential gears of the reducer cone and the differential bearing of the differential bearing generally have a sharp "salt or "squeaky" sound; the sound beats stable; changes with the speed of the car.
The cone-shaped automatic gear front bearing of the reducer is larger when the car is taxiing; the noise of the rear bearing is larger when traveling.
The noise of the differential bearing is generally a constant sharp sound; but its tempo is much smoother than that of the reducer cone automatic gear bearing.
The rear axle gear noise is resolved in normal straight line travel; because the differential half shaft gear and the planet gear have little relative motion; so no noise is heard.
During the car's travel; the cause of the abnormal sound of the rear axle gear is mostly formed by the poor smoothness; then the gear of the reducer is worn out; if the abnormal sound can be heard at various sliding speeds; The nut of the automatic gear is loosely formed.
At low speeds; knocking sounds at the rear axle; speeding up or slowing down; announcing the unique irritability of the noise. The above problems can be detected from one or more of the following:
1. The gap between the journal shaft and the differential case of the differential half shaft gear is not appropriate.
2 The cooperation between the differential cross shaft journal and the differential case is not appropriate.
3. The backlash of the half shaft spline gear and the differential half shaft gear keyway is not appropriate.
4. The meshing backlash between the differential half shaft gear and the planetary gear is not appropriate.
5 differential cone automatic, forced gear meshing gap is not appropriate.
6 thrust washer wear.
The vehicle is in the middle of the road; the abnormal noise of the rear axle is due to the gap of the gear meshing; the differential bearing preloading is not properly adjusted or both. When the abnormal noise is removed; the differential gear must be disassembled. The meshing clearance of the reducer gear, the preload of the reducer cone automatic gear bearing and the touch marks of the reducer gear.

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