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Research Papers

Contact Characteristics of Recess Action Worm Gear Drives With Double-Depth Teeth

[+] Author and Article Information
Wei-Liang Chen

Department of Mechanical Engineering,  National Chiao Tung University, Hsinchu 30010, Taiwan, R.O.C.

Chung-Biau Tsay1

Department of Mechanical and Computer-Aided Engineering,  Feng Chia University, Taichung 40724, Taiwan, R.O.C.cbtsay@mail.nctu.edu.tw

1

Corresponding author.

J. Mech. Des 133(11), 111006 (Nov 11, 2011) (10 pages) doi:10.1115/1.4004985 History: Received January 17, 2011; Revised August 10, 2011; Published November 11, 2011; Online November 11, 2011

Based on the previously developed mathematical model of a series of recess action (RA) worm gear drive (i.e., semi RA, full RA, and standard proportional tooth types) with double-depth teeth, the tooth contact analysis (TCA) technique is utilized to investigate the kinematic error (KE), contact ratio (CR), average contact ratio (ACR), instantaneous contact teeth (ICT) under different assembly conditions. Besides, the bearing contact and contact ellipse are studied by applying the surface topology method. Three numerical examples are presented to demonstrate the influence of the assembly errors and design parameters of the RA worm gear drive on the KE, CR, ACR, ICT, and contact patterns.

FIGURES IN THIS ARTICLE
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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Worm gears , Equations
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References

Figures

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Figure 1

Schematic figures of approach action and recess action for (a) standard proportional tooth; (b) semi RA; (c) full RA worm gear drives

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Figure 2

Normal section of hob cutter with double-depth teeth, low pressure angle and varying pitch lines

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Figure 3

ZN worm-type hob cutter with varying pitch lines represented by parameter dx

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Figure 4

Coordinate systems for (a) hob cutter setting with an inclined lead angle; (b) screw surface generation of ZN worm-type hob cutter

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Figure 5

Coordinate systems between ZN worm-type hob cutter and RA worm gear

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Figure 6

Simulation of gear meshing with assembly errors

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Figure 7

(a) Common tangent plane and polar coordinates (b) measurement on surface separation distance

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Figure 8

Kinematic errors of full RA worm gear drives

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Figure 9

Contact patterns and loci of full RA worm gear drives

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Figure 10

Contact ellipses on tooth flank of the full RA worm gear generated by different pitch radii of oversize ZN worm-type hob cutters

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