What are the main causes of gear wear and fatigue?
Publish Time: 2024-09-25
The main causes of gear wear and fatigue can be summarized as follows:
1. Main causes of gear wearPoor lubrication:When the lubricating oil is insufficient or the oil quality is poor, the friction between the gears will increase, resulting in accelerated wear.Corrosive substances or impurities in the lubricating oil will also aggravate the wear of the tooth surface.Excessive use load:In the working environment of high speed, high load and frequent gear shifting, the impact force and alternating load on the tooth surface are large, which is easy to cause wear.Machining accuracy and installation quality:Insufficient machining accuracy or poor installation of gears, such as gear tooth profile error, tooth pitch error, etc., will lead to uneven contact on the tooth surface, thereby accelerating wear.Insufficient tooth surface hardness:When the tooth surface hardness is not enough, the ability to resist wear will be reduced, and it is easy to wear under alternating loads.
2. Main causes of gear fatigueExcessive contact stress:In the process of gear meshing, excessive contact stress on the tooth surface is the main cause of fatigue pitting. When the contact stress on the tooth surface exceeds the fatigue limit of the material, tiny cracks will be generated on the tooth surface, which will then expand into pitting or peeling.Material fatigue:Gear materials are prone to fatigue damage under alternating loads. If the material's fatigue resistance is insufficient, the gear fatigue process will be accelerated.Poor lubrication:In addition to causing wear, poor lubrication will also affect the lubrication state of the tooth surface and reduce the fatigue resistance of the tooth surface.Improper installation and use:Failure to strictly implement the maintenance process during the installation process will lead to poor installation. For example, the meshing clearance of the gear is too large or too small, the axis parallelism is poor, etc., which will cause excessive local contact load on the tooth surface, thereby causing fatigue pitting.Tooth surface temperature is too high:Under high speed and heavy load conditions, the tooth surface temperature will rise. If the lubrication is poor or the cooling is insufficient, the performance of the tooth surface material will decrease and the fatigue process will be accelerated.
The main causes of gear wear and fatigue involve lubrication, use load, processing accuracy, installation quality, material properties and working environment. In order to reduce gear wear and fatigue, a series of measures need to be taken, such as optimizing the lubrication system, reasonably controlling the use load, improving the processing and installation accuracy, and selecting materials with good fatigue resistance.
