Clearance design method for ball bearing of electric drive system

By optimizing the ball bearing clearance using a full-factor coupling design method, the problem of clearance design deviation in the electric drive system of new energy vehicles was solved, and the bearing was accurately matched under dynamic operating conditions, thereby improving the reliability and consistency of the bearing.

CN122072744AActive Publication Date: 2026-05-22LUOYANG LYC BEARING +1
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Patent Information

Application Number
CN202610533316.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-22
Publication Date
2026-05-22
Estimated Expiration
2046-04-22

AI Technical Summary

Technical Problem

In existing technologies for electric drive systems in new energy vehicles, the ball bearing clearance design fails to effectively incorporate the effects of machining discreteness, contact deformation, and foreign object intrusion, resulting in a large deviation between the designed clearance and the actual working clearance, which affects the reliability and consistency of the bearing.

Method used

A full-factor coupled design method is adopted. By calculating factors such as nominal interference, contact deformation, and foreign object intrusion, a clearance design model is constructed. Combined with parameters such as bearing and shaft tolerances, temperature rise, and load, the clearance range is optimized to ensure accurate matching of the bearing under dynamic operating conditions.

Benefits of technology

This improves the operational performance and quality consistency of ball bearings in electric drive systems, reduces the risk of foreign object intrusion, and enhances the reliability and service life of the bearings.

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Abstract

The invention discloses a clearance design method for a ball bearing of an electric drive system, belongs to the technical field of mechanical structure design, and aims to solve the technical problems of low clearance matching precision, insufficient bearing reliability and poor terminal quality consistency caused by insufficient coupling of machining discreteness, ball-raceway contact deformation, foreign matter invasion and other key influence factors in the existing design. The method fully adapts to the application scenes of bearing large-scale production, multi-supplier processing level difference and load spectrum complexity and variability in the automobile industry, a matching scheme of the shaft diameter tolerance zone and the bearing clearance can be accurately output, and the consistency of design and actual production is remarkably improved; the method is suitable for clearance and matching design of core components such as deep groove ball bearings of electric drive transmission systems of new energy automobiles and has extremely high engineering application value.
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