Method for improving meshing performance of ultra-short cup-shaped harmonic flexible gear through axial modification

Abstract

The invention discloses a method for improving meshing performance of an ultra-short cup-shaped harmonic flexible gear through axial modification. According to the method, axial modification is performed on two ends of gear teeth of the ultra-short cup-shaped harmonic flexible gear, and modification is not performed in a middle tooth width range near the middle section of the gear teeth. The gearteeth of the modified gear are divided into three sections within the full tooth width range, and the form that the middle is high and the two ends are low is shown. After axial modification, pitch circle lines of the front and rear sections of gear teeth and the rotation central axis of the harmonic flexible gear form a first contact angle and a second contact angle respectively, and the first contact angle and the second contact angle are the same as deformation inclination angles generated at the two ends of a long shaft of a cam by the flexible gear after a wave generator is installed on the ultra-short cup-shaped harmonic flexible gear respectively. The deformation inclination angles generated at the two ends of the long shaft of the cam by the flexible gear after the wave generator is arranged in the ultra-short cup-shaped harmonic flexible gear are offset, so that the gear teeth of the flexible gear and gear teeth of a rigid gear can be kept in a good meshing state in all axialsections, and the meshing performance of the ultra-short cup-shaped harmonic flexible gear is improved.

Description

technical field [0001] The invention relates to a method for improving the meshing performance of an ultra-short cup type harmonic flexspline through tooth direction modification, and belongs to the technical field of harmonic gear transmission. Background technique [0002] Harmonic transmission is a new type of gear transmission, which mainly includes three basic components: flexspline, rigid spline and wave generator. Elastic deformation, the teeth at both ends of the long axis of the cam are fully meshed with the teeth of the rigid gear, while they are completely disengaged at the short axis of the cam, and the teeth in different sections of the circumference between the long axis of the cam and the short axis of the cam , some mesh in, some mesh out; when the wave generator rotates continuously, the wave generator forces the deformation of the flexspline to change continuously, and the teeth of the flexspline turn from meshing to meshing, from meshing to disengagement, ...

AI Technical Summary

Problems solved by technology

While the cup-shaped harmonic flexspline has high load capacity and long service life, it also has a significant 6 disadvantage: when the cam wave generator with flexible bearings is installed into the flexspline, the flexspline will There will be an outward deformation inclination at both ends. Under the influence of the deformation inclination, different sections of the flexspline tooth along the axial direction will produce different deformation amounts. Therefore, although the flexspline and rigid spline maintain the same Good meshing state, but there will be meshing interference or no meshing phenomenon in the rest of the axial section, and the deformation angle of the flexspline increases with the decrease of the axial dimension of the flexspline. When the axial dimension L of the flexspline and the cup diameter When the ratio of D is less than or equal to 0.5, the deformation inclination of the flexspline will lead to a significant reduction in the contact area between the teeth of the flexspline and the rigid spline, the stress of the flexspline will increase sharply, and the bearing capacity and service life will be greatly reduced.

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