4 major abnormal noise problems

Source: China Bearing Network Time: 2014-07-24

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The sounds announced by the sensation of various systems in the operation of the automobile are collectively referred to as the sound of the car; some books are also called noise. These sounds can be divided into two categories: normal sound and abnormal sound (unusual sound). Many problems of the car are It is reflected by the abnormal sound; the abnormal sound is the appearance; the fault is the essence. If it is not timely removed, it is easy to constitute a serious mechanical problem.
KK car common noise can be divided into: powertrain abnormal sound, transmission system abnormal sound, traveling system abnormal sound, wind resistance abnormal sound and other major categories.
Powertrain abnormal sound
The KK problem is mainly presented in the engine and its associated components; the abnormal sound varies with the engine speed; and the frequency is higher.
KK1. The engine is broken and the engine is broken. This abnormal sound is better than the same; the abnormal sound is fierce with the engine; and the sound frequency is the same as the frequency of the vibration. If this happens, don't be nervous; look for a service station to check the engine oil supply and incineration. , gas supply and engine computer; remove the problem.
KK2. The efficiency of the engine smooth system is reduced, resulting in excessive collision of the machine parts. Perhaps the engine is not damaged by oil change for a long time. The engine oil is not damaged due to the smoothing of the seal; the smoothness of the smooth seal may cause the oil pressure to fail; the smoothing effect of the engine will be reduced; Excessive damage to the abnormal sound. The sensation frequency of this mechanical abnormal sound is directly related to the engine speed (encouraging frequency); the normal operating speed of the engine is 800-5000r/min. The frequency of the attack noise is very high; the human ear can only hear A short or continuous sound of a short time; followed by an increase in engine speed; abnormal sounds are added in both volume and frequency. If your car presents the above-mentioned abnormalities; it is necessary to be mentally prepared; at the very least, it is a crash. Repair the engine to see the wear condition.
KK3. Belts and bearings wear abnormally. Household cars generally choose belt drive to transmit the power of the engine to generators, air conditioner compressors, power steering pumps, pumps, etc. However, due to quality problems or poor working environment, it will incur The early wear of the belt leads to slip. The same problems often occur in air bearing bearings, water pump bearings, generator bearings and other bearing parts. This abnormal sound is often sharp, high volume and cool car. The method is simple; use one The root rod (or metal rod, long handle, etc.) is placed on a certain part of the car; the sound is significantly changed when the noise is close to the abnormal sound source. This problem can be removed by replacing the excessive wear parts.
KK transmission system abnormal sound
KK driveline abnormal noise often comes from the gearbox, differential, clutch and other components of the abnormal sound with the gear and clutch status changes show a significant change.
KK transmission and clutch parts are more; the reason for the sound is also more complicated; in the analysis and discrimination should pay attention to whether it can be related to a specific situation. Some planetary gears sound significantly at a speed of about 60Km / h. Shift cable, gear The abnormality of the fork causes an abnormal noise to hang some specific gears. The clutch does not leave the bearing and wears the noise when the clutch is cut.
Has presented such a repairing end car; travel to 110Km / h shock intense. After repeated test run found that the engine speed 3000r / min noise; but with the gear reduction; noise and sensation minus. Disassembly and repair of the gearbox assembly; fault cleaning. This is a very serious problem caused by the gearbox and the engine are not properly matched; the abnormal sound and the sensation are significantly different with the change of the gear.
The KK clutch problem has a similar manifestation with the gearbox problem; the abnormal sound changes with the clutch and the connection situation. Only the basic principle is known; even non-professionals can make a simple discriminating of the abnormal sound of the drive train.
KK travel system is abnormal
The abnormal sound of the KK travel system is directly related to the car's travel condition (speed, steering).
KK's traveling system tends to be caught in the wheel bearing, the cage, the lever head, the steering arm and other components. The early wear of the wheel bearing will cause sharp noise; and with the distinctive features: add with the speed; abnormal frequency Add, regardless of engine speed, transmission gear, clutch condition. The abnormal sound of the cage and the control arm is more obvious when the vehicle is turning. If the sound source is difficult to find, it can judge the abnormal sound condition through the above characteristics. There is a general understanding that there is a great deal of assistance for the protection of personal interests; it can reduce the probability of being cheated by a wrong-track repair shop.
KK wind resistance noise
KK speed reached a fixed value abnormally significant; the speed is reduced and the abnormal noise is not seen. Here is the abnormal sound caused by the normal wind resistance. This kind of abnormal sound is caused by the airflow around the body and the noise caused by the pressure change. Specifically Including cavity consensus, ducted pipe noise, and accessories such as antennas, wipers, mirrors, and spoilers are sensational. Opening of the seal and cracking of the plastic parts will cause changes in the external curve of the body; the air turbulence will be different when traveling to high speed. ring.

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