PDF
Full
Outline
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.
PDF
197
85
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
