A brief analysis of the new type of car body driving the motor gear failure


When the gear is loose, when the gear and the motor shaft are loose, even for a motor with a small pinion anti-backcap, the motor shaft will be damaged. After the discovery, the traction motor should be removed in time to make it lose power, which can avoid further expansion of the loss, otherwise it will cause serious consequences such as motor scrapping.
There are three kinds of cases in which the broken gear is broken: one is that the tip of the tooth is broken; the other is that the gear has a longitudinal through crack at the root of the tooth, which causes the gear and the shaft to loosen. The third is that the gear is cracked and the tooth end is folded. damage. The above-mentioned damage will have serious consequences, especially gears with broken ends and cracks. The broken blocks will cause further damage to the relevant components.
For the folding teeth and the tooth cracks, the two sometimes have a causal relationship with each other. Due to the occurrence of cracks, the main and driven gears are abnormally meshed to form teeth. After folding the teeth, the strength of the gear is reduced, and cracking is inevitable. This is a common form of failure in the field. Causes of damage and solutions The first type of failure occurs mainly because of poor lubrication between gears and improper meshing clearance.
The lubricating oil of the original gear is a hyperbolic oil, which is liquid splash lubrication, and sometimes the splash lubrication of the gear box causes poor splash lubrication and wear. If it is changed to traction gear grease solid lubrication, but the lubrication condition in the gearbox can not be observed, it is also a defect. But there is no doubt that the dry friction caused by lack of oil exacerbates the wear of the gears.
The meshing gap between the gears is too large or too small to cause poor meshing between the two teeth, resulting in abnormal wear. For the above two kinds of wear, the oil can be tightened by strengthening the maintenance oil supply, fixing the oil supply cycle, improving the assembly quality of the wheelset, and strictly implementing the process. One reason for the looseness of the gear is that the interference between the gear and the shaft of the motor 1 is insufficient; another reason is that the contact area is insufficient due to the taper between the gear and the shaft. According to the requirements, the contact area of ​​the two should be no less than 75. If it is not enough, the grinding should be carried out. Therefore, when the gear is installed, the gear should be fully preheated, and the contact area should be tested and assembled as required to ensure the interference.
Gear cracks and tooth tip breakage. During operation, the gears are subjected to torque and lateral loads, forming cracks at weak strength and causing loosening. However, it is undeniable that a part of the wheel pair causes the wheel pair to be scratched due to the operation of the brake, etc., so that the smooth load between the gears becomes an impact load, which has a certain influence on the generation and amplification of the crack.
Another important reason and often overlooked is that when the gear is mounted on the motor shaft, the gear is cooled and the interference is too large, causing the gear to cool, the motor shaft and gear The radial stress increases, and under the combined action of radial stress and torque, cracks occur in the portion where the strength of the root of the gear is low. Some gears on the site cannot be pulled out under normal disassembly pressure, which is the result of excessive interference.
In summary, there are many forms of motor pinion failure, and the reasons are also complicated. Sometimes it is the result of multiple reasons. In operation, it is very important to find and timely process in time.

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