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RESEARCH PAPERS: Gearing and Power Transmission Papers

Precision of Spiral-Bevel Gears

[+] Author and Article Information
F. L. Litvin, R. N. Goldrich

University of Illinois at Chicago Circle, Chicago, Ill. 60680

J. J. Coy

Propulsion Laboratory, AVRADCOM Research and Technology Labs, NASA, Lewis Research Center, Cleveland, Ohio 44135

E. V. Zaretsky

NASA, Lewis Research Center, Cleveland, Ohio 44135

J. Mech., Trans., and Automation 105(3), 310-316 (Sep 01, 1983) (7 pages) doi:10.1115/1.3267362 History: Received August 23, 1982; Online November 19, 2009

Abstract

An analytical method was derived for determining the kinematic errors in spiral-bevel gear trains caused by the generation of nonconjugate surfaces, by axial displacements of the gear assembly, and by eccentricity of the assembled gears. Such errors are induced during manufacturing and assembly. Two mathematical models of spiral-bevel gears were included in the investigation. One model corresponded to the motion of the contact ellipse across the tooth surface (geometry I) and the other along the tooth surface (geometry II). The following results were obtained: 1) Kinematic errors induced by errors of manufacture may be minimized by applying special machine settings. The original error may be reduced by an order of magnitude. The procedure is most effective for geometry II gears. 2) When trying to adjust the bearing contact pattern between the gear teeth for geometry I gears, it is more desirable to shim the gear axially; for geometry II gears, shim the pinion axially. 3) The kinematic accuracy of spiral-bevel drives is most sensitive to eccentricities of the gear and less sensitive to eccentricities of the pinion. The pecision of mounting accuracy and manufacture is most crucial for the gear, and less so for the pinion.

Copyright © 1983 by ASME
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