Method of calculating life of thin-walled flexible support bearing

Abstract

A method of calculating life of a thin-walled flexible support bearing includes: using existing finite element analytical software ANSYS as a platform to establish a thin-walled rolling bearing contact nonlinear finite element analytical model that considers shaft hole fit clearance and radial internal clearance, and calculating the life of the thin-walled rolling bearing. The method has the advantages that the thin-walled rolling bearing contact nonlinear finite element analytical model that considers shaft hole fit clearance, radial internal clearance and other factors is established for the first time, the model gives a full consideration to ferrule deformation and actual boundary conditions, influence law of the bearing fit clearance and radial internal clearance upon the load and life of a bearing roll is analyzed, the nonlinear convergence problem is solved, and the thin-walled rolling bearing finite element model is more practical.

Description

Technical field [0001] The invention relates to the technical field of bearing life calculation, in particular to a method for calculating the life of a thin-walled flexible supporting bearing. Background technique [0002] At present, the load distribution of classic rolling bearings is mostly based on the assumption of rigid ring support for load analysis, but this is an ideal state. In fact, there is no completely rigid support body, and the ring will inevitably deviate from the ideal The overall deformation of the circle. For thin-walled bearings used in aero engines, when there is a matching gap between the outer ring of the bearing and the bearing seat, the outer ring is only loaded at one position. figure 1 Schematic diagram of the single-point support thin-walled rolling bearing assembly. in figure 1 There is an eccentricity μ between the bearing center o and the bearing seat center o', that is, the fitting clearance. Due to the existence of this gap, there will be loca...

AI Technical Summary

Problems solved by technology

Due to the existence of this gap, there will be local small area contact between the bearing outer ring and the bearing seat. When the thin-walled bearing bears radial load, the ferrule will bend and deform. This gap directly affects the load distribution of the bearing. At this time, the ferrule If it becomes a flexible support body, it is unreasonable to adopt the rigid support assumption

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