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Downsizing Technology for Chassis Parts Fastening Structure

Article of Honda R&D Technical Review Vol.29 No.1

Summary

Downsizing technology for fastening structures was developed to realize a low-cost, next-generation, lightweight, high-performance suspension. The key technologies developed to achieve this were strength class 12.9 and 14.9 high-strength bolts that can also be applied to the vehicle body, and technology that controls the limit friction characteristic of the fastening joint surface. When the strength is increased with conventional thermal refining steel, the delayed fracture characteristic decreases, so a high-strength hexagon flange bolt was developed that uses patenting-treated pearlite steel to realize both increased strength and an enhanced delayed fracture characteristic. Technology for controlling the limit friction characteristic of the fastening joint surface made it possible to secure stable slipping resistance by optimization of micro unevenness, evaluated using developed accurate friction coefficient measurement technology, which helped to downsize the fastening structure. These two technologies were applied separately and in combination as appropriate to each fastening position in the 2016 model year CIVIC, and helped to achieve a lightweight and low-cost suspension.

Reference

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(4) Pai, N. G., Hess, D. P.: Three-dimensional Finite Element Analysis of Threaded Fastener Loosening due to Dynamic Shear Load, Engineering Failure Analysis, Vol. 9, p. 383-402, (2002)
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Author (organization or company)

Motoki HISHIDA(Automobile R&D Center)、Masato SATO(Automobile R&D Center)、Akihiko ASAMI(Automobile R&D Center)、Hisashi ISHIMATSU(Automobile R&D Center)

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