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RESEARCH PAPERS

The Influence of Gear Hobbing on Worm Gear Characteristics

[+] Author and Article Information
Vilmos Simon

Institute of Machine Design, Department of Machine Elements, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Müegyetem rkp. 3, H-1111 Budapest, Hungarysimon.vilmos@gszi.bme.hu

J. Manuf. Sci. Eng 129(5), 919-925 (Apr 27, 2007) (7 pages) doi:10.1115/1.2752524 History: Received January 12, 2006; Revised April 27, 2007

In this paper, a method is presented for the determination of the differences between the worm gear tooth surface processed by an oversized hob of finite number of teeth or by a flying tool, and the theoretically required gear tooth surface. The influence of hob oversize and machine tool settings on tooth contact pressure and transmission errors is determined. The full geometry and kinematics of gear tooth processing by an oversized hob or by a flying tool is included. The theoretical background is implemented by a computer program. By using this program, the influence of relevant design parameters of the worm gear set and the hob and of machine tool settings on processed gear tooth errors and on loaded tooth contact of the worm gear pair is investigated and discussed.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Gear teeth processing by hob

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Figure 2

Influence of hob tooth number on maximal gear tooth surface errors

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Figure 3

Influence of the axial shift of flying tool on maximal gear tooth surface errors

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Figure 7

Influence of hob oversize on maximum tooth contact pressure

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Figure 8

Influence of hob oversize on maximum angular displacement of the driven gear

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Figure 9

Influence of gear tooth profile shift coefficient on maximum tooth contact pressure

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Figure 10

Influence of gear tooth profile shift coefficient on maximum angular displacement of the driven gear

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Figure 18

Pressure distribution in a worm gear pair processed with a machine tool setting angle error of Δγ=0.1deg

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Figure 17

Pressure distribution in a worm gear pair processed with a machine tool setting angle error of Δγ=−0.1deg

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Figure 16

Influence of machine tool setting angle error on maximum angular displacement of the driven gear

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Figure 15

Influence of machine tool setting angle error on maximum tooth contact pressure

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Figure 14

Pressure distribution in a worm gear pair processed by a hob of 5% oversize and gear tooth profile shift coefficient x=0.6

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Figure 13

Pressure distribution in a worm gear pair processed by a hob of 5% oversize and gear tooth profile shift coefficient x=−0.5

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Figure 12

Pressure distribution in a worm gear pair processed by a hob of 5% oversize

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Figure 11

Pressure distribution in a fully conjugated worm gear pair

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Figure 6

Influence of gear tooth profile shift coefficient on maximal gear tooth surface errors

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Figure 5

Influence of worm pitch diameter on maximal gear tooth surface errors

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Figure 4

Influence of gear tooth number on maximal gear tooth surface errors

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