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Spur gears

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001499
EISBN: 978-1-62708-236-5
... Abstract Three spur gears made from 8622 Ni-Cr-Mo alloy steel formed a straight-line train in a speed reducer on a rail-mounted overslung lumber carrier. The gears were submitted for nondestructive examination and evaluation, with no accompanying information or report. Two teeth on one...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001502
EISBN: 978-1-62708-234-1
... Abstract A portion of two large spur tooth bull gears made from 4147H Cr-Mo alloy steel that had spalling teeth was submitted for evaluation. The gears were taken from a final drive wheel reduction unit of a very large open-pit mining truck. The parts had met the material and initial heat treat...
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Published: 15 May 2022
Fig. 2 Examples of a flexible mold showing two castings of spur gears as produced from the mold. Source: iStock/coddy More
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Published: 30 August 2021
Fig. 2 Sections of a (a) spur gear, (b) spur rack, (c) helical gear, and (d) helical rack. Source: Ref 1 More
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Published: 01 January 2002
Fig. 1 Sections of a spur gear (a) and a spur rack (b). More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001248
EISBN: 978-1-62708-221-1
... Abstract Failure occurred in the teeth of a case-hardening Ni-Cr-Mo alloy steel spur gear in the transmission system of heavy duty tracked vehicles. The defects were in the nature of seizure on the involute profile. Scrutiny of the transmission system showed there might be choking...
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Published: 01 January 2002
Fig. 8 Tooth contact lines on a spur gear (a), a bevel gear (b), and a low-angle helical gear (c). More
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Published: 01 June 2019
Fig. 1 Enlarged view of a typical damaged tooth of the spur gear. The damaged area of the tooth (white in colour) is shown by an arrow. 7 × More
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Published: 01 June 2019
Fig. 1 Spur gear, 0.9×. Only two teeth pitted, one low on profile and the adjacent tooth high on profile. Mating gear had two teeth as mirror image. This could only occur with the gears in a static position under a reverberating type of load. More
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Published: 01 June 2019
Fig. 1 Spur gear tooth, SAE 4147H, quenched and tempered to 311 HB, machined completely, induction hardened with a tooth space inductor by traversing one tooth space at a time. (a) Surface spalling along one tooth flank, (b) No hardened case on active profile of one side of the teeth. More
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Published: 01 January 2002
Fig. 90 Grinding cracks on the flanks of a small spur gear wheel. Source: Ref 30 More
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Published: 01 January 2002
Fig. 9 Lines of contact on a stepped spur gear. The heavy line on a tooth face of each gear section represents the instantaneous line of contact for that section. This offset-contact pattern is typical for helical, spiral bevel, and hypoid gears. More
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Published: 01 January 2002
Fig. 18 Spur-gear tooth. An internal crack originating at an oxide-type inclusion below the surface at the pitchline. A pit is being formed. Nital etch. 90× More
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Published: 01 January 2002
Fig. 31 Thermal fatigue cracking of a spur gear. (a) Radial cracking due to frictional heat against the thrust face. 0.4×. (b) Progression of thermal fatigue produced by the frictional heat. 1.5× More
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Published: 01 January 2002
Fig. 33 Spur-gear tooth showing combination failure modes. (a) Tooth-bending impact. (b) Tooth shear. Arrows indicate direction of applied force. More
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Published: 01 January 2002
Fig. 43 Spur gear. External rupture (assembled, but not in service) with origin at the end face. See also Fig. 44 . More
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Published: 01 January 2002
Fig. 44 Spur gear. External rupture originating from a grinding check. See also Fig. 43 . More
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Published: 01 January 2002
Fig. 5 Illustration of internal gears. (a) Section of a spur-type internal gear. (b) Relation of internal gear and mating pinion More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
... because a gear is designed with a specific function in mind. The question is, Will this gear perform the function that was intended by the designer? Types of Gears Spur Gears Spur gears ( Fig. 1a ) are used to transmit motion between parallel shafts or between a shaft and a rack. The teeth...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006820
EISBN: 978-1-62708-329-4
... Abstract This article first reviews variations within the most common types of gears, namely spur, helical, worm, and straight and spiral bevel. It then provides information on gear tooth contact and gear metallurgy. This is followed by sections describing the important points of gear...