A Three-arc Harmonic Gear Shaping Cutter and Its Tooth Profile Design Method

Abstract

The invention discloses a three-arc harmonic gear shaper cutter, which belongs to the technical field of harmonic reducer gear processing cutters. The basic tooth profile of the cutter tooth is composed of three sequentially tangent circular arc segments; The radius of the upper arc segment is ρ 1 , the radius of the arc segment is ρ 2 and the radius ρ of the lower arc segment 3 ; Also discloses a tooth profile design method of a three-arc harmonic gear shaper cutter, which designs a three-arc tooth profile of a flexible spline and a three-arc tooth profile of a rigid spline, based on the obtained three-arc tooth profile of a rigid spline The circular arc tooth profile adopts the gear meshing kinematics method to obtain the theoretical conjugate tooth profile of section A, the theoretical conjugate tooth profile of section B and the theoretical conjugate tooth profile of section C; the upper arc section Ac1 and the lower section are obtained by arc fitting. The circular arc segment Ac3 and its related parameters; the middle circular arc segment Ac2 and its related parameters are obtained through the plane analytic geometry method; finally, the auxiliary parameters are determined according to the process requirements of the processed harmonic gear to achieve the three-arc harmonic The purpose of wave gear working tooth profile.

Description

technical field [0001] The invention belongs to the technical field of gear processing tools for harmonic reducers, and in particular relates to a three-arc harmonic gear shaper cutter and a tooth profile design method thereof. Background technique [0002] Harmonic gear transmission is a transmission device in which the wave generator acts to control the elastic deformation of the flexspline to transmit force and motion. It has a series of advantages such as large transmission ratio, light weight, small size, large number of meshing tooth pairs, and high transmission precision. It has become the core key component of the equipment transmission system in the fields of industrial robots, aerospace, machine tools and medical equipment. [0003] When the American scholar MUSSER obtained the patent of the harmonic gear transmission in 1959, he adopted a linear tooth shape with a large pressure angle. Although this tooth shape can meet the requirements of a fixed transmission rat...

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Problems solved by technology

[0003] When the American scholar MUSSER obtained the patent of the harmonic gear transmission in 1959, he adopted a linear tooth shape with a large pressure angle. Although this tooth shape can meet the requirements of a fixed transmission ratio, it does not consider the neutral line of the flexspline. The tangential displacement and the movement of the symmetry line of the flexspline tooth caused by the curvature change when the neutral line is deformed, etc. This tooth shape has some shortcomings in application.

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