A modified wave cam and its design method, wave generator and harmonic reducer

Abstract

The invention provides a design method of a modified wave cam, which comprises the following steps: initially determining a 1 / 4 elliptic curve; determining the abscissa position of the center of a 1 / 4 arc; determining the ordinate position of the center of the 1 / 4 arc; Modified wave cam outer contour 1 / 4 curve; determine the modified wave cam outer contour 1 / 4 curve; inward bias curve; determine the complete modified wave cam outer contour curve. A modified wave cam designed according to the above design method. A wave generator includes the modified wave cam as described above, and a flexible bearing arranged on the outer edge of the modified wave cam. A harmonic reducer at least includes the above-mentioned wave generator, flexible wheel, rigid wheel and crossed roller bearing. The modified wave cam harmonic reducer designed by the design method of the present invention avoids the interference of gear teeth, reduces the maximum stress and stress concentration of the flexible wheel in the alternating stress change, and increases the teeth between the flexible wheel and the rigid wheel. The meshing area improves the bearing capacity, accuracy and life of the harmonic reducer.

Description

technical field [0001] The invention relates to a modified wave cam and a design method thereof, a wave generator and a harmonic reducer, and belongs to the technical fields of mechanical processing and harmonic reducer. Background technique [0002] The harmonic reducer was born in the 1950s and is considered a major breakthrough in the field of mechanical transmission. It is widely used in aerospace, robotics, radar, precision machine tools, instrumentation and other fields. The harmonic reducer is mainly composed of three major components, the flexible spline, the rigid spline, and the wave generator. It is a transmission method that relies on the elastic deformation of the flexible gear to transmit force and motion. It is popular because of its simple structure, large transmission ratio, high transmission precision and high transmission efficiency. [0003] The wave generator is a component that deforms the flexspline to generate deformation waves. It is one of the impo...

AI Technical Summary

Problems solved by technology

For example, the most commonly used elliptical cam wave generator at present, the elliptical cam is more convenient for the deformation control of the wave generator cam, and the design of the outer curve is relatively simple, but the stress on the flexwheel on the long axis of the cam is relatively large, and at the same time The number of tooth pairs is small, which causes the life, load capacity and transmission accuracy of the harmonic reducer to fail to meet the requirements of industrial development for the reducer

[0005] At present, there have been some research results on the design of the outer peripheral curve of the wave generator cam, but there are still the following problems: the long axis part of the commonly used standard elliptical wave generator cam has a small meshing tooth area, and the stress on the flexspline at this position is too large , will accelerate the destruction of the harmonic reducer

The cam curve expression of the improved non-standard elliptical wave generator is not detailed enough, the value allocation method is not perfect enough, there are interference, interference and stress concentration problems, resulting in the harmonic reducer is not precise enough

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