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RESEARCH PAPERS

Transient Dynamics of the Metal V-Belt CVT: Effects of Pulley Flexibility and Friction Characteristic

[+] Author and Article Information
Nilabh Srivastava

106 EIB, Flour Daniel Building, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634snilabh@clemson.edu

Imtiaz Haque

106 EIB, Flour Daniel Building, Department of Mechanical Engineering, Clemson University, Clemson, SC 29634imtiaz.haque@ces.clemson.edu

J. Comput. Nonlinear Dynam 2(1), 86-97 (Sep 28, 2006) (12 pages) doi:10.1115/1.2389233 History: Received July 17, 2006; Revised September 28, 2006

A continuously variable transmission (CVT) offers a continuum of gear ratios between desired limits. The present research focuses on developing a continuous one-dimensional model of the metal V-belt CVT in order to understand the influence of pulley flexibility and friction characteristics on its dynamic performance. A metal V-belt CVT falls under the category of friction-limited drives as its performance and torque capacity rely significantly on the friction characteristic of the contact patch between the belt element and the pulley. Since the friction characteristic of the contact patch may vary in accordance with the loading and design configurations, it is important to study the influence of the friction characteristic on the performance of a CVT. Friction between the belt and the pulley sheaves is modeled using different mathematical models which account for varying loading scenarios. Simple trigonometric functions are introduced to capture the effects of pulley deformation on the thrust ratio and slip behavior of the CVT. Moreover, since a number of models mentioned in the literature neglect the inertial coupling between the belt and the pulley, a considerable amount of effort in this paper is dedicated towards modeling the inertial coupling between the belt and the pulley and studying its influence on the dynamic performance of a CVT. The results discuss the influence of friction characteristics and pulley flexibility on the dynamic performance, the axial force requirements, and the torque transmitting capacity of a metal V-belt CVT drive.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Pushing V-belt CVT arrangement

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Figure 2

Metal pushing V-belt structure

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Figure 3

Pulley deformation model

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Figure 4

Kinematic description of the belt element

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Figure 5

Free body diagram of driver band pack

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Figure 6

Forces of belt element on driver pulley sheave

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Figure 7

Free body diagram of driver belt element

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Figure 8

Torque on driver pulley

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Figure 9

Belt-drive geometrical description

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Figure 10

Friction characteristics for the contact zone

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Figure 11

Time histories of belt pitch radius

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Figure 12

Relative velocity diagrams

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Figure 13

Time histories of pulley half-sheave angle

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Figure 14

Time histories of belt compressive force

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Figure 15

Time histories of pulley and belt angular speeds

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Figure 16

Time histories of belt acceleration, case 1

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