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Technical Briefs

Experiments on Root Stresses of Helical Gears With Lead Crown and Misalignments

[+] Author and Article Information
M. Hotait

The Gear Dynamics and Gear Noise Research Laboratory, Department of Mechanical Engineering, The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210

A. Kahraman1

The Gear Dynamics and Gear Noise Research Laboratory, Department of Mechanical Engineering, The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210kahraman.1@osu.edu

1

Corresponding author.

J. Mech. Des 130(7), 074502 (May 20, 2008) (5 pages) doi:10.1115/1.2931127 History: Received March 26, 2007; Revised June 28, 2007; Published May 20, 2008

In this study, the results of an experimental parametric study of the combined influence of shaft misalignments and gear lead modifications on the load distribution and tooth bending stresses of helical gear pairs are presented. A set of helical gear pairs having various amounts of total lead crown was operated under loaded, low-speed conditions with varying amounts of tightly controlled shaft misalignments. Gear teeth were instrumented through strips of strain gages along the face width of gears at the tooth fillet region at a roll angle that is near the start of the active profile. Variations of root strains along the face width were quantified for different levels of shaft misalignments and gear lead crown. The results presented demonstrate the direct link between the lead crown and gear misalignments as well as the effectiveness of the lead crown in preventing edge loading conditions due to misalignment. The results presented here form a database that should be available for a validation of gear contact models in terms of their ability to simulate misalignments.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Gear test machine used in the study shown with a test gear pair

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Figure 2

A view of the strain gages on gear g1

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Figure 3

Definition of shaft misalignments (ϕ is the transverse pressure angle of the gears)

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Figure 4

Measured strain time histories for gear pair g1-g2 having λ=0 at h=0. (a) T=100Nm, (b) T=200Nm, (c) T=300Nm, and (d) T=400Nm.

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Figure 5

Measured strain time histories for gear pair g1‐g2 having λ=0 at T=200Nm. (a) h=−0.002m∕m, (b) h=−0.001m∕m, (c) h=0, (d) h=0.001m∕m, and (e) h=0.002m∕m.

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Figure 6

Measured strain time histories for gear pair g1‐g3 having λ=12μm at T=200Nm. (a) h=−0.002m∕m, (b) h=−0.001m∕m, (c) h=0, (d) h=0.001m∕m, and (e) h=0.002m∕m.

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Figure 7

Measured strain time histories for gear pair g1‐g4 having λ=25μm at T=200Nm. (a) h=−0.002m∕m, (b) h=−0.001m∕m, (c) h=0, (d) h=0.001m∕m, and (e) h=0.002m∕m.

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Figure 8

Measured maximum root strain variation with h along the face width at T=200Nm for (a) λ=0 and (b) λ=25μm

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