Friction Characteristics Analysis for Clamping Force Setup in Metal V-Belt Type CVT

In order to increase the transfer efficiency in a metal V-belt type CVT (Continuously Variable Transmission), it is effective to lower belt clamping force from a current setting value. However, setting the clamping force too low will cause a macro slip (large belt slip). Thus, in order to set the cl...

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Published in:SAE transactions 2005-01, Vol.114, p.1822-1829
Main Authors: Nishizawa, Hiroyuki, Yamaguchi, Hiroyuki, Suzuki, Hideyuki, Osawa, Masataka, Iwatuki, Kunihiro, Oshiumi, Yasuhiro
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container_title SAE transactions
container_volume 114
creator Nishizawa, Hiroyuki
Yamaguchi, Hiroyuki
Suzuki, Hideyuki
Osawa, Masataka
Iwatuki, Kunihiro
Oshiumi, Yasuhiro
description In order to increase the transfer efficiency in a metal V-belt type CVT (Continuously Variable Transmission), it is effective to lower belt clamping force from a current setting value. However, setting the clamping force too low will cause a macro slip (large belt slip). Thus, in order to set the clamping force to the proper level, the friction characteristics between the belt and the pulley (belt friction characteristics) must be understood in detail, and the macro slip threshold must be defined. In this paper, we shall propose a friction expression model for a metal V-belt type CVT and use this model to explain the speed reducing ratio dependence and speed dependence of the maximum friction coefficient (μmax). We shall also define the macro slip threshold in torque fluctuation environment.
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title Friction Characteristics Analysis for Clamping Force Setup in Metal V-Belt Type CVT
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