Abstract

The metal pushing V-belt type continuously variable speed transmission (CVT) commonly has a hydraulic chamber that is formed by fastening together the movable pulley and pulley cover parts. The mechanism by which damage occurred to the pulley cover in the spin-formed fastening portion during development was clarified. In order to understand the damage mechanism, the area of the pulley cover subjected to spin forming was examined with a scanning electronic microscope. This revealed that voids had formed inside the examined area, as expected under the theory of ductile fracture, and it was confirmed that durability varied with the form of the voids. Quantitative treatment of the damage was made possible by numerical analysis of the mechanism of void formation using McClintock’s equation for damage evaluation. It was further confirmed that the results of this numerical analysis agreed with the results of durability tests of the pulley, verifying the validity of the analytical values.

References

1. (1) Japanese Patent Kokai No. (1996) 8-210454: Actuator Case Spin Forming Structure, for a Pulley for Variable Speed Transmission
2. (2) McClintock, F.A.: A criterion for ductile fracture by the growth of holes, J. Applied Mechanics, P.363–371 (1968)
3. (3) Saito, T., et al: Development of a CVT Metal Belt Stress Simulation Technology, Honda R&D Technical Review, Vol. 13, No. 1, p.125–130 (2001)

Author (organization or company)

• Akihito OHASHI（Tochigi R&D Center）
• Toshihiro SAITO（Tochigi R&D Center）
• Toyoji HISATSUNE（Tochigi R&D Center）

Publication Information

Article of Honda R&D Technical Review Vol.14 No.1 (197 - 202)

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Citation Information