Influence of Tooth Profile Deviations on Helical Gear Wear

[+] Author and Article Information
A. Kahraman

Department of Mechanical Engineering,  Ohio State University, 206 W. 18th Avenue, Columbus, OH 43210kahraman.1@osu.edu

P. Bajpai

 University of Toledo, Toledo, OH 43606-3390

N. E. Anderson

General Motors Powertrain

J. Mech. Des 127(4), 656-663 (Oct 05, 2004) (8 pages) doi:10.1115/1.1899688 History: Received May 14, 2004; Revised October 05, 2004

In this study, a surface wear prediction model for helical gears pairs is employed to investigate the influence of tooth profile deviations in the form of intentional tooth profile modifications or manufacturing errors on gear tooth surface wear. The wear model combines a finite-element-based gear contact mechanics model that predicts contact pressures, a sliding distance computation algorithm, and Archard’s wear formulation to predict wear of the contacting tooth surfaces. Typical helical gear tooth modifications are parameterized by an involute crown, a lead crown, and an involute slope. The influence of these parameters on surface wear are studied within typical tolerance ranges achievable using hob/shave process. The results indicate that wear is related to the combined modification parameters of a gear pair rather than individual gear parameters. At the end, a design formula is proposed that relates the mismatch of contacting surface slopes to the maximum initial wear rate.

Copyright © 2005 by American Society of Mechanical Engineers
Topics: Wear , Gears , Design
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Figure 1

Definition of the tooth surface modification parameters

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Figure 2

Flowchart of wear computation

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Figure 3

A three-dimensional contact mechanics model of the example gear pair (14)

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Figure 4

Illustration of sliding distance of a point ij on gear p at different positions r(9)

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Figure 5

(a) Maximum initial dedendum and (b) addendum wear rates of gear p as a function of Ap and Bp for Dp=10μm, Ag=3μm, Bg=9μm, and Dg=10μm

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Figure 6

(a) Maximum initial dedendum and (b) addendum wear rates of gear g as a function of Ap and Bp for Dp=10μm, Ag=3μm, Bg=9μm, and Dg=10μm

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Figure 7

Influence of (a) Bp and (b) Ap on initial wear distribution on the midtransverse plane of the gears for Bg=9μm, Ap=13μm, Ag=3μm, and Dp=Dg=10μm

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Figure 8

Influence of Ap on maximum initial wear rates at (a) dedendum and (b) addendum for various values of Ag. Bp=5μm, Bg=9μm, and Dp=Dg=10μm

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Figure 9

Variation of maximum addendum and dedendum wear rates as a function of involute mismatch Ap−Ag for (a) Bp+Bg=14μm and (b) Bp+Bg=20μm



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