Modification method of secondary straight-tooth planetary gear

Abstract

The invention provides a modification method of a secondary straight-tooth planetary gear. The modification method comprises the following steps: b, determining the load value of gear modification quantity, wherein the load value refers to the interfacial force of a rotating system bearing of the secondary straight-tooth planetary gear in a running state; c, according to the load action of a complex mechanical coupling relationship, obtaining a transmission error curve, and at the same time, obtaining the normal load distribution diagram of the tooth surface of each gear tooth in unit length when the gear is in contact; and d, respectively carrying out profile modification and axial modification on the two different contact surfaces of the planetary gear, and determining modification parameters. According to the modification method of the secondary straight-tooth planetary gear, provided by the invention, the engagement impact of a pinion pair can be reduced under the condition of keeping gear processing precision and saving materials as far as possible, so that the vibration and noise of a planetary gearbox are effectively reduced, and the unbalance load phenomena of planetary gear engagement are greatly reduced; accordingly, the gear transmission stability is improved, the gear bearing capability is improved, the gear service life is prolonged; and the cost is saved, and the hurt of noise to the physical and psychological health of a human body is also reduced.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a method for modifying a two-stage spur planetary gear. Background technique [0002] A planetary gearbox is a mechanism in which multiple planetary gears rotate around a sun gear. It is also a mechanism that reduces the transmission speed ratio and increases the torque of the motor proportionally. Compared with ordinary gearboxes of the same kind, it has stable transmission, large bearing capacity, large transmission ratio in a small space, especially long life, and it is small in size and beautiful in appearance. [0003] The planetary gearbox is an important part widely used in mechanical transmission. When a pair of gears mesh, due to the unavoidable errors such as tooth pitch and tooth shape, meshing impacts will occur during operation and corresponding to the meshing frequency of the gears. Noise, friction noise also occurs between the tooth surfaces due to relative sliding. Since ...

AI Technical Summary

Problems solved by technology

[0007] The design idea of ​​traditional planetary gearboxes is generally based on the calculation method of combining simplified theory and experience. The gear tooth surface is designed as a standard involute tooth surface, which can theoretically make the gear mesh better, but due to processing and assembly The existence of errors, coupled with the elastic deformation of the gear body and the supporting parts of the gear under the action of the load, makes the meshing surface deviate from the theoretical involute and also causes a certain unbalanced load phenomenon in the meshing area of ​​the gear along the tooth width direction. A huge impact phenomenon occurs between the gear pairs, which in turn causes greater vibration and noise in the gearbox; on the other hand, the uneven force on the tooth surface accelerates the fatigue damage of the gear

The traditional modification method is based on the modification amount determined under the predetermined load, without considering the aforementioned complex mechanical coupling relationship, and the obtained modification amount can only improve the meshing quality to a certain extent

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