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gear failure

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
...Abstract Abstract Gears can fail in many different ways, and except for an increase in noise level and vibration, there is often no indication of difficulty until total failure occurs. This chapter begins with the classification of gear failure modes, followed by sections discussing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270148
EISBN: 978-1-62708-301-0
... visual examination wear Summary Background Visual Examination of General Physical Features Testing Procedure and Results There have been a few cases of premature failure of quill shafts in the accessory gear boxes of aircraft engines. The failure was found to be due to gradual wear...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270177
EISBN: 978-1-62708-301-0
...Abstract Abstract A driven gear in the gear box of an aircraft engine fractured after a 40 h test run. The driving gear and gear shaft were also damaged. Based on the results of fractography, chemical analysis, metallography, and hardness testing, the fracture was caused by a fatigue crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
...Abstract Abstract This chapter reviews the knowledge of the field of gear tribology and is intended for both gear designers and gear operators. Gear tooth failure modes are discussed with emphasis on lubrication-related failures. The chapter is concerned with gear tooth failures...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
...Abstract 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250311
EISBN: 978-1-62708-345-4
..., the chapter describes the test procedures for surface durability (pitting), root strength (bending), and scoring (or scuffing) testing. durability fatigue test gear failure gears mechanical testing residual stress rolling contact fatigue test single-tooth fatigue test single-tooth overload test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... and Prevention , Vol 11 , Metals Handbook , 9 th ed., American Society for Metals , 1986 7. Glover A.G. et al ., Failures of Weldments , Failure Analysis and Prevention , Vol 11 , Metals Handbook , 9 th ed., American Society for Metals , 1986 8. Alban E. , Failures of Gears...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... and the applications of nitrided gears are also provided. The chapter presents case studies on successful nitriding of a gear and on the failure of nitrided gears used in a gearbox subjected to a load with wide fluctuations. bending-fatigue life distortion fatigue damage gas nitriding gear boxes gears...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250001
EISBN: 978-1-62708-345-4
..., and subsurface rolling contact fatigue. The subject of rolling contact fatigue is discussed more fully in Chapters 3, “Ferrous and Nonferrous Alloys” and 13, “Gear Failure Modes and Analysis.” Straight Bevel Gear The straight bevel gear undergoes the same stresses as discussed above, including a very...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630189
EISBN: 978-1-62708-270-9
... with surface pitting near the pitch line, which was low on this gear tooth. The rippling shown is plastic deformation caused by the sliding action under heavy contact pressure and is a warning that the metal is close to failure. The parallel diagonal marks are tool marks resulting from the shaving operation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130177
EISBN: 978-1-62708-284-6
... quench cracking resistance, low-cast steels usually satisfactory, medium capital investment Survey summary of sources of gear failures Table 2 Survey summary of sources of gear failures Cause of gear failure % Material quality and forming 0.8 Design 6.9 Service-related...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050191
EISBN: 978-1-62708-311-9
... currently recognizes 36 modes of gear failure. However, they find that the greatest stress on a gear is from the pitch diameter through the fillet of the root. Failure is most likely to occur at these points. Therefore, it is highly desirable that the wear surface and the root of gearing be hard. Patterns E...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250163
EISBN: 978-1-62708-345-4
... is needed on a gear tooth to prevent case failure due to Hertzian contact stress that causes pitting? In general, high case depths adversely affect the quality of case and, hence, the gear life. So, the determination of proper case depth on a gear tooth is quite important and is based on its capacity...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250139
EISBN: 978-1-62708-345-4
... is discussed further in Ref 15 and 16 . Additional information on fatigue is also contained in Chapter 13, “Gear Failure Modes and Analysis” and Chapter 14, “Fatigue and Life Prediction.#x201D; Quality Control and Inspection Inspection is one of the most important stages in gear production...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250039
EISBN: 978-1-62708-345-4
... are desired. In addition, nitriding steels make it possible to surface harden the teeth of large gears having thin sections that might be impractical to carburize and quench. Nitrided gears are relatively free from wear up to the load at which surface failure occurs, but at this load they become badly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320033
EISBN: 978-1-62708-347-8
... of hardness versus case depth in gears made of HP 9-4-30 steel Now the question is, how much case is needed on a gear tooth to prevent case failure due to Hertzian contact stress that causes pitting? In general, high case depths adversely affect the quality of case and, hence, the gear life. So...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
... below the surface at the load center is also relatively small for gears that are not heavily loaded. Hence, the failure of such gears is not due to pitting fatigue but rather to simple wear. To enhance wear life of nitrided gears it is thus necessary to have good surface finish (0.61 μm, or 24 μin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320001
EISBN: 978-1-62708-347-8
... microstructures. A well-controlled heat treatment produces the desirable surface and core properties for resistance to various failure modes. These failure modes include bending and contact (pitting) fatigues, and failures due to simple surface wear of gear teeth. The type of heat treatment used significantly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
.... dowel bolts fatigue failure fractography low-cycle fatigue test metallography scanning electron microscopy Summary Background Pertinent Specifications and Manufacturing Details Testing Procedure and Results The spur and bevel gears of an aircraft engine were fastened by a set...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770001
EISBN: 978-1-62708-337-9
.... Parrish G. , Ingham D.W. , and Chaney J.M. , The Submerged Induction Hardening of Gears, Parts 1 and 2 , Heat Treat. Met. , Vol 25 ( No. 1 ) 1998 , p 1 – 8 , and Vol 25 ( No. 2 ), p 43 – 50 2. Jacobson M. , Gear Design: Lessons from Failures , Automot. Des. Eng. , Aug...