1. Home
  2. Honda R&D Technical Review Vol.29 N...
  3. Downsizing Technology for Chassis P...

Technical Review e-Book: Summary

Downsizing Technology for Chassis Parts Fastening Structure

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


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.


(1) Nakano, M.: Current Status and Production Technology of High-Strength Steel Wire, Journal of the Japan Society for Technology of Plasticity, Vol. 54, No. 624, p. 4-8, (2013)
(2) Nakasato, F.: Recent Trends of High Strength Bolting Steels and Their Related Technology, Journal of the Japan Society for Heat Treatment, Vol. 43, No. 3, p. 129, (2003)
(3) Maruyama, K., Sawa, T., Tsuji, H.: Neji teiketsutai no setsugoumen no suberikeisuu ni kansuru jikken houkokusho, nihon neji kenkyuu kyoukai bumonshi, p. 1-32, (1993), (in Japanese)
(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)
(5) Izumi, S., Yokoyama, T., Iwasaki, A., Sakai, S.: Three-dimensional Finite Element Analysis of Tightening and Loosening Mechanism of Threaded Fastener, Engineering Failure Analysis, Vol. 12, p. 604-615, (2005)
(6) Takashima, M., Iida, Z., Takada, K., Mori, S.: Development of 1600 N/mm2 Class High Strength Bolts, Honda Technical Review, Vol. 15, No. 2, p. 183-188
(7) Kaiso, M., Chiba, M.: Journal of the Japan Society for Heat Treatment, R&D KOBE STEEL ENGINEERING REPORTS, Vol. 52, No. 3, p. 52-56, (2002)
(8) Tarui, T., Maruyama, T., Takahashi, J., Nishida, S., Tashiro, H.: Microstructure Control and Strengthening of High Carbon Steel Wires, Nippon Steel Technical Reports, No. 381, p. 51-56, (2004)
(9) JIS G 3507-2: 2005, Carbon steels for cold heading−Part 2:Wires
(10) ISO 13565-2: 1996, Geometrical Product Specifications (GPS)−Surface texture: Profile method; Surfaces having stratified functional properties−Part 2 Height characterization using the linear material ratio curve

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)

We would like to get your opinion on this research paper. (This is only applicable to registered members.)

The readers of this research paper have also selected these research papers.

Vehicle Dynamics Performance Enhancing Technology for New CIVIC
Article of Honda R&D Technical Review Vol.29 No.1
Non-linear CAE Technology to Balance Handling and Ride Comfort
Article of Honda R&D Technical Review Vol.29 No.1
Development of Chassis Performance Design Technologies for MBD of Mass-production Vehicles
Article of Honda R&D Technical Review Vol.29 No.1