Technical Briefs

Optimal Choice of the Shaft Angle for Involute Gear Hobbing

[+] Author and Article Information
Carlo Innocenti

Department of Mechanical and Civil Engineering, University of Modena and Reggio Emilia, Via Vignolese, 905 41100 Modena, Italycarlo.innocenti@unimore.it

J. Mech. Des 130(4), 044502 (Mar 10, 2008) (5 pages) doi:10.1115/1.2839012 History: Received August 22, 2006; Revised July 02, 2007; Published March 10, 2008

With reference to the machining of an involute spur or helical gear by the hobbing process, the paper suggests a new criterion for selecting the position of the hob axis relative to the gear axis. By adhering to the proposed criterion, the hob axis is set at the minimum distance from the gear axis, thus maximizing the depth of the tooth spaces of the gear. The new criterion is operatively implemented by solving a univariate equation, which stems from a new, synthetic analysis of the meshing of crossed-axis involute gears. A numerical example shows application of the suggested procedure to a case study and compares the optimal hob setting to the customary one.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Gears
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Grahic Jump Location
Figure 1

Basic geometric parameters of a helical involute gear

Grahic Jump Location
Figure 2

Paths of contact of a crossed-axis helical gearing

Grahic Jump Location
Figure 3

Auxiliary reference frames for gear i(i=1,2)



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