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Optimization of V-surface Angle for Metal Pushing V-belt CVT

Article of Honda R&D Technical Review Vol.22 No.1

Summary

The V-surface angles of the elements of metal-pushing V-belts were focused on, and an optimum angle was studied, in order to increase both torque transfer capacity and torque transfer efficiency in a CVT. The resulting reduction of the element V-surface angles from 11deg C to 9deg C produced an increase of approximately 20% in torque transfer capacity, and an increase of approximately 0.5% in unit efficiency in the OD ratio (close to a speed ratio of 0.45). With regard to the fatigue strength of the belt, measurements of the force between the shafts and durability tests showed that the ring tension is reduced and torque transfer capacity is increased in proportion to the degree of narrowing of the V-surface angles of the elements. The torque transfer efficiency of a metal-pushing V-belt is affected by the maximum level of variation in belt trajectory, as
represented by the difference between the maximum and minimum values of the movement of the belt in the radial direction on the pulley. The research discussed in this paper indicated that control of the degree of variation in belt trajectory reduced friction loss due to the slip-motion of the belt in the radial direction, thus increasing torque transfer efficiency.

Reference

(1) AutoBiz (Separate volume) AUTOMOTIVE TECHNOLOGY 2004 (The volume on strategy), Part 3-Future of CVT, Nikkei Business Publications, Inc., p. 194-199 (2003)
(2) Sakagami, K., Okubo, K., Fujii, T., Yoshida, H., Yagasaki, T.: Effective Control of Pulley Thrusts using an Index Describing Belt Slip State in Metal V-belt Type CVT for Improving Transmitting Efficiency, Transactions of Society of Automotive Engineers of Japan, Vol. 39, No. 5, p. 101-106 (2008)
(3) Nakahara, T., Miyazaki, K.: Measurement of shear strength of thin film on solid surface in relation to friction, Proceedings of JAST Tribology Conference Saga, September 2007, p. 455-456 (2007)

Author (organization or company)

Tooru YAGASAKI(Automobile R&D Center)、Hideaki AOYAMA(Automobile R&D Center)、Shuji ICHIJO(Automobile R&D Center)、Hirohiko TOTSUKA(Automobile R&D Center)、Masamichi HARADA(Automobile R&D Center)

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