Method for calculating fatigue life of flexible thin-wall bearing in harmonic reducer

Abstract

The invention discloses a method for calculating the fatigue life of a flexible thin-wall bearing in a harmonic reducer. The method comprises the following steps: S1, acquiring structural parameters,materials, attributes and working conditions of the bearing; S2, carrying out stress analysis, and establishing an equivalent external load model; S3, establishing a radial deformation model of the flexible thin-wall bearing, and establishing an elastic compression amount model; S4, establishing a force balance equation and a deformation coordination equation, enabling the deformation coordinationequation of N'contact points at different balls to be simultaneous with the force balance equation, and calculating N 'different contact loads Pi; S5, establishing a rated dynamic load model and an equivalent dynamic load model; and S6, establishing a flexible thin-wall bearing fatigue life model. According to the method, a more practical load distribution model can be established according to the practical deformation of the assembling working condition of the inner ring of the flexible thin-wall bearing, and the fatigue life of the flexible thin-wall bearing can be more accurately calculated.

Description

technical field [0001] The invention belongs to the field of bearing life calculation, in particular to a method for calculating the fatigue life of a flexible thin-walled bearing in a harmonic reducer. Background technique [0002] The harmonic reducer is mainly composed of three basic components: wave generator, flexible gear and rigid gear. A new type of reducer developed on the principle of gear transmission. Among them, the wave generator is composed of flexible thin-walled bearings and cams. Flexible thin-walled bearings are the key components of the wave generator. During work, the inner ring is installed on the cosine cam, which bears cyclic stress loads during work, and the outer ring is installed on the flex spline, which is elastic with the rotation of the cam during work. Deformation, not only bear cyclic stress load, but also bear alternating stress load. [0003] Most studies on the mechanical properties of classical rolling bearings are based on the assumpt...

AI Technical Summary

Problems solved by technology

However, the inner ring of the flexible thin-walled bearing in the harmonic reducer will undergo obvious flexible deformation in the assembled state, and the load distribution obtained by the assumption of the traditional rigid ring is significantly different from the actual situation, which cannot be used for flexible thin-walled bearings. Wall bearing fatigue life for accurate calculation

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