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RESEARCH PAPERS

Error Analysis and Compensation for Meshing Contact of Toroidal Drives

[+] Author and Article Information
Ligang Yao1

Mechanical Engineering Department, Fuzhou University, Fuzhou, 350002, People’s Republic of Chinaylgyau@fzu.edu.cn

Jian S. Dai2

Department of Mechanical Engineering, Kings College London, University of London, The Strand, London, WC2R 2LS, United Kingdomjian.dai@kcl.ac.uk

Guowu Wei

Mechanical Engineering Department, Fuzhou University, People’s Republic of Chinaweiguown@fzu.edu.cn

1

Currently a Postdoctoral Research Fellow at Kings College London.

2

Corresponding author.

J. Mech. Des 128(3), 610-617 (Jul 18, 2005) (8 pages) doi:10.1115/1.2179460 History: Received February 24, 2004; Revised July 18, 2005

This paper investigates the meshing errors of the toroidal drive, reveals three typical latency errors and develops the error analysis in this typical type of gear drives. Having identified the latency errors, the error integrated coordinate transformation is implemented. This leads to the development of the error impinged meshing model. The model reveals for the first time the effect of the latency errors in gear meshing contact of a toroidal drive and characterizes the error effect on meshing contact. The effect of these errors on the gear coordinate frames is hence presented and on the contact paths of rollers is analyzed. The study leads to a new method for compensating the three latency errors by introducing a bearing with a changeable oil film. The method is then verified in a prototype and demonstrates to be effective.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic structure of the toroidal drive

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Figure 2

The spherical coordinate frame of a meshing roller

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Figure 3

Planet worm-gear center-distance offset Δa

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Figure 4

Sun-worm lateral misalignment Δw

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Figure 5

Planet worm-gear angular misalignment δ

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Figure 6

Meshing coordinate frame

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Figure 7

Contact curves influenced by the planet worm-gear center-distance offset Δa (in mm)

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Figure 8

Contact paths of roller in a sun-worm slot

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Figure 9

Contact curves influenced by the sun-worm lateral misalignment Δa (in mm)

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Figure 10

Contact paths of roller in a sun-worm slot

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Figure 11

Contact curves influenced by the planet worm-gear angular misalignment δ (in radian)

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Figure 12

Contact paths of roller in a sun-worm slot

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Figure 13

Contact curve influenced by the errors of Δa, Δw (in mm) and δ (in radian)

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Figure 14

Schematic of oil film floating method for error compensation

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Figure 15

Photograph of the sun-worm and planet worm-gears with oil-film floating compensation

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Figure 16

Photograph of the experiment for checking even contact with the error compensation

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Figure 17

Comparative results of contact curves

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