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A foreign object (top of adjacent tooth) became enmeshed in spiral gear (0....

Available to Purchase
in Causes of Gear Failure > Systematic Analysis of Gear Failures
Published: 01 June 1985
Fig. 5-38. A foreign object (top of adjacent tooth) became enmeshed in spiral gear (0.5×) teeth causing a full section break. The top of the adjacent tooth also broke by impact from some object. More
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Spur gear, 3×. Tooth bending fatigue with origin from a crack at both root ...

Available to Purchase
in Causes of Gear Failure > Systematic Analysis of Gear Failures
Published: 01 June 1985
Fig. 5-37. Spur gear, 3×. Tooth bending fatigue with origin from a crack at both root radii caused by the enmeshing of a portion of a needle bearing roller. More
Book Chapter

Causes of Gear Failure

Available to Purchase

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420129
EISBN: 978-1-62708-452-9
Abstract
This chapter focuses on the causes of gear failure under five major headings. These include basic material, focusing on steel, engineering, focusing on the integration of design, manufacturing, heat treatment, and service application.
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Book Chapter

Modes of Gear Failure

Available to Purchase

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420085
EISBN: 978-1-62708-452-9
..., the purpose of spiral bevel gearing is to relieve the stress concentrations by having more than one tooth enmeshed at all times. There are instances, however, when a certain designed spiral angle will allow a one-to-one tooth ratio for a very short duration of time. During this moment, the load more than...
Abstract
This chapter presents a detailed discussion on the three most frequent gear failure modes. These include tooth bending fatigue, tooth bending impact, and abrasive tooth wear. Tooth bending fatigue includes surface contact fatigue (pitting), rolling contact fatigue, contact fatigue (spalling), thermal fatigue, and shaft fatigue. Tooth bending impact includes tooth shear, tooth chipping, case crushing, and torsional shear.
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Book Chapter

Fatigue and Life Prediction

Available to Purchase

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
... is to relieve stress concentrations by having more than one tooth enmeshed at all times. The greater the angle of the helix or spiral, the greater the number of teeth that mesh simultaneously and share the load. With increased angularity, the length of the slanted contact line on each tooth is shortened...
Abstract
This chapter summarizes the various kinds of gear wear and failure and how gear life in service is estimated and discusses the kinds of flaws in material that may lead to premature gear fatigue failure. The topics covered are alignment, gear tooth, surface durability and breakage of gear tooth, life determined by contact stress and bending stress, analysis of gear tooth failure by breakage after pitting, and metallurgical flaws that reduce the life of gears. The chapter briefly reviews some components in the design and structure of each gear and/or gear train that must be considered in conjunction with the teeth to enhance fatigue life.
View PDF for content titled, Fatigue and Life Prediction