Analysis on the runout of automobile reducer

If the imprint of the gear meshing area is out of the small end, the shim at the lower part (near the side of the gear) of the large bearing (7609E bearing) on ​​the driving street wheel should be appropriately added. If the footprint of the meshing area is close to or out of the big end, the shim should be appropriately reduced. Generally, the gear manufacturer has its own specific base for the adjusting shim. In addition, mark the increase or decrease according to the specific situation of each pair of gears. If it is marked with +2, the gasket should generally be reduced by 0.2 mm on the basis of the base; if it is marked with -20, the gasket should generally be increased by 0.2mm piece.

In the actual assembly process, if the gear and the large plane of the differential housing are qualified and the assembly process is clean, the runout should not exceed 0.70mm, because when the large plane of the differential housing is turned, the machine tool should be adjusted properly. , The large plane runout of the shell will not exceed 0.30mm, so the full standards of each manufacturer shall not exceed 0.05mm. Although there is no clear regulation on the runout of the passive gear tooth back, under normal circumstances, its runout will not exceed 0.02mm.

More than 90% of the abnormal noise of the new car reducer is caused by the large amount of runout after the assembly of the passive wheel, or the incorrect position of the meshing area of ​​the active and passive gears. The excessive runout of the tooth back is mainly caused by the excessive runout of the large plane of the differential housing. The material of the shell is gray cast iron, because the material is soft, it is easy to deform once bumped. The amount of swing far exceeds the amount of gear clearance, which will inevitably cause a violent impact during the operation of the active and passive gears, so that the lubricating oil cannot form an oil film on the gear surface, which reduces the life of the reducer gear that can be used under normal conditions of 150,000 km to only 1,000 km. about. For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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