Failure Analysis of Eccentric Bolt with Abnormal Rotation
Journal Title: Automobile Technology & Material - Year 2024, Vol 39, Issue 1
Abstract
After the vehicle abuse road test, the eccentric bolt connecting spring swing arm and subframe rotates mainly because the flange surface of the bolt is convex, the friction on the flange surface is uneven, and the friction coefficient does not meet the standard requirements (standard value: 0.08～016, measured value: head friction coefficient is 0.25～0.27, and the total friction coefficient is 0.18～0.20). The friction surface of flange is line contact.Compared with the surface contact, this kind of bolt has poor anti-loose and anti- rotation performance. Improve the flatness of the bolt flange surface and the uniformity of the friction surface by the following measures: reducing the step height at the hexagon connection of bolts (from 3.2～3.25 mm to 3.1～3.15 mm), increasing the hole diameter of gasket before riveting (from 13.85～13.9 mm to 14.3～14.35 mm) and making the gasket into an opposite angle before riveting (0.5°～1°). The friction coefficient of optimized bolt is qualified, and there is no abnormal rotation failure after the vehicle abuse road test.
Authors and Affiliations
Ke Shenglan, Zhang Shaofu, Zhang Xiaojun
Keywords
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- EP ID EP731934
- DOI 10.19710/J.cnki.1003-8817.20230029
- Views 45
- Downloads 0
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