The rear axle main reducer of the car adopts a hyperbolic gear drive with smooth meshing, low noise, light weight and compact structure. Because the axes of the main gear and the passive gear are offset, the helix angle of the driving gear is larger than the helix angle of the driven gear, so that the degree of coincidence of the gear is improved, the transmission is more stable, the noise is greatly reduced, and the carrying capacity is improved. On the other hand, such gear transmission not only causes rolling friction between the tooth surfaces of the main and driven gears, but also longitudinal sliding friction. Under such severe conditions as high temperature and high pressure, the oil film between the tooth surfaces is easily destroyed. Therefore, it is necessary to use a hyperbolic gear oil with a fully reliable performance and extreme pressure additives. At present, many organic compounds such as phosphorus, sulfur and chlorine are used as additives at home and abroad. Under extreme pressure, additives can form metal phosphides, sulfides, chlorides and other low-melting substances with the metal, so that the friction surface forms a layered structure, easy to cut, so under extreme pressure conditions, can replace the broken oil film , play the role of extreme pressure lubrication. The common gear oil is refined from lubricating oil. In use, it mainly relies on the viscosity and physisorption of its own arsenic and arsenic oil to form a layer of oil film on the surface of the gear, which separates the tooth surfaces and acts as a lubricant. The thickness of the oil film produced by common gear oil will also change with the load. When the load increases to a value, it will cause the oil film to break, causing the gear surface to produce dry wear, resulting in scratches between gear tooth surfaces. Gluing causes severe wear, so the final gear must use hyperbolic gear oil with extreme pressure properties.
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