Gear modification method for reducing contact temperature of tooth surface of gear

Abstract

The invention relates to the technical field of gear modification, in particular to a gear modification method for reducing a contact temperature of a tooth surface of a gear. The method comprises the following steps: S1, selecting a three-tooth meshing area closest to a tooth crest and a tooth profile corresponding to a two-tooth meshing area as a to-be-modified tooth profile; S2, establishing a rectangular plane coordinate system (O-LX delta) with an end point, relatively away from the tooth crest, on the tooth profile to be modified as an original point O, wherein the longitudinal coordinate axis LX of the rectangular plane coordinate system (O-LX delta) is parallel to the radial direction of the gear, and the transverse coordinate axis of the rectangular plane coordinate system is the modification amount delta; S3, calculating the maximum modification amount delta max of the end point, relatively close to the tooth crest, on the tooth profile to be modified; and S4, selecting a modification curve, wherein the equation of the modification curve is as follows: in the formula, L delta is the longitudinal coordinate of the end point, relatively close to the tooth crest, on the tooth profile to be modified. The highest tooth surface contact temperature during gear tooth meshing can be reduced, and sudden change of loads of all meshing areas of meshing gears can be reduced or even eliminated.

Description

technical field [0001] The invention relates to the technical field of gear modification, in particular to a gear modification method for reducing the contact temperature of gear tooth surfaces. Background technique [0002] At present, in the fields of automobiles, aviation, and aerospace, gear systems are developing in the direction of high speed, heavy load, and high precision. There are higher requirements for the strength and load-carrying capacity of the gear teeth. Increasing the gear tooth modulus and lengthening the tooth width can improve the carrying capacity, but at the same time increase the volume-to-power ratio of the gear transmission system. In this regard, some scholars proposed to increase the gear coincidence degree to improve the gear bearing capacity, and called the spur gear with a coincidence degree greater than 2 as a high coincidence degree gear. After the degree of coincidence increases, the total length of the contact line of the tooth surface i...

AI Technical Summary

Problems solved by technology

CN107255153A discloses a tooth tip repairing method for the gluing capacity of involute cylindrical gears, which can prevent gears from engaging in advance due to deformation after long-term meshing, and reduce the Hertzian stress at the tooth tip corners when entering meshing , but no solution is given for how to reduce the highest temperature point (mesh-in, mesh-out point) when the gear meshes through modification

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