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gear lubrication

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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
... lubrication, the measurement of the backlash, and the necessary factors for starting the failure analysis. Next, the article explains various gear failure causes, including wear, scuffing, Hertzian fatigue, cracking, fracture, and bending fatigue, and finally presents examples of gear and reducer failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092102
EISBN: 978-1-62708-234-1
... Abstract A nylon oil-lubricated driving gear showed pitting upon visual inspection. The pitting produced numerous surface microcracks. Further investigation (visual inspection and 37x images) supported the conclusion that failure occurred in association with large-scale fragmentation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0009190
EISBN: 978-1-62708-225-9
... Abstract In an industrial application, 24 speed-increaser gearboxes were used to transmit 258 kW (346 hp) and increase speed from 55 to 375 rev/min. The gears were parallel shaft, single helical, carburized, and ground. The splash lubrication system used a mineral oil without antiscuff...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001078
EISBN: 978-1-62708-214-3
... were examined using SEM microscopy. Failure of the gears was attributed to heavy wear resulting from misalignment. A lack of adequate lubrication was also noted. Periodic alignment adjustment and lubrication were recommended. Catastrophic wear Gear teeth Nuclear reactor components Tin bronze...
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
... in the lubricating oil line. Such would cause seizure of the gears and damage. The incidence of such defects stopped after corrective measures were taken. Cracking (fracturing) Spur gears Surface defects Fe-0.20C-1.25Ni-1.0Cr-0.9Mo Rolling-contact wear At one time there were instances of failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046146
EISBN: 978-1-62708-217-4
.... Fig. 1 Aluminum alloy 7075-T73 landing-gear torque-arm assembly that was redesigned to eliminate fatigue fracture at a lubrication hole. (a) Configuration and dimensions (given in inches). (b) Fracture surface showing fatigue beach marks. Approximately 2× Two cadmium-plated flanged bushings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0046242
EISBN: 978-1-62708-236-5
... in the part. Evidence found supports the conclusions that failure of the coupling was by fatigue and that incomplete demagnetization of the coupling following magnetic-particle inspection caused retention of metal chips in the roots of the teeth. Improper lubrication caused gear teeth to overheat and spall...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001575
EISBN: 978-1-62708-217-4
... that the nr. 5 brg compartment is in underpressure during engine start and run. That means that nr. 5 compartment gears receives the oil later than the remaining areas of the pump and, at starting, it's not lubricated at all. Conclusions The uncontrolled fit interference of bushing into the al spacer...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... failure of an antifriction bearing, a nylon driving gear, and a polyoxymethylene gear wheel. antifriction bearing cohesive wear elastomers glassy thermoplastics interfacial wear lubricant mechanical properties nylon nylon driving gear plastics polyoxymethylene gear wheel semicrystalline...
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
... lubricants. Gear-Tooth Contact The way in which tooth surfaces of properly aligned gears make contact with each other is responsible for the heavy loads that gears are able to carry. In theory, gear teeth make contact along lines or at points; in service, however, because of elastic deformation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... Abstract The US Army Research Laboratory performed a failure investigation on a broken main landing gear mount from an AH-64 Apache attack helicopter. A component had failed in flight, and initially prevented the helicopter from safely landing. In order to avoid a catastrophe, the pilot had...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001706
EISBN: 978-1-62708-217-4
... Abstract The truck beam of the left main landing gear (MGL) of a Boeing 707 airplane collapsed on the ground just after the aircraft was unloaded and refueled. The investigation revealed that failure was caused by the propagation of an intergranular crack originating from the bottom of the pit...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... applications get exposed to seawater, and a machine component such as a gear or brake pad may come in direct contact with leaking oil or water. For elastomers, their applications in seal rings and automobile tires regularly expose the material to lubricants, chemicals, and water. For industrial seals...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... deformation. They both represent the final stages in lubrication breakdown and are barriers to expanding the limits of lubrication for many types of mechanical components ( Ref 29 ). Scuffing Scuffing, being typical in gear applications, is a sudden and irreversible process defined as the localized...
Image
Published: 01 June 2019
Fig. 1 Pitting and surface microcracks on the tooth flank of an oil-lubricated nylon driving gear. 37×. Source: Ref 1 More
Image
Published: 01 January 2002
Fig. 15 Pitting and surface microcracks on the tooth flank of an oil-lubricated nylon driving gear. 37×. Source: Ref 53 More
Image
Published: 01 June 2019
Fig. 1 Aluminum alloy 7075-T73 landing-gear torque-arm assembly that was redesigned to eliminate fatigue fracture at a lubrication hole. (a) Configuration and dimensions (given in inches). (b) Fracture surface showing fatigue beach marks. Approximately 2× More
Image
Published: 30 August 2021
Fig. 30 Bearings that failed because of wear by abrasive material in the bearing. (a) Needle-roller bearing. Note that flats have been worn onto the rollers. (b) Abrasive wear caused by natural diamond dust (≤5 μm) that was deliberately introduced into the lubricant in the laboratory. Deep More
Image
Published: 01 January 2002
Fig. 3 Bearings that failed because of wear by abrasive material in the bearing. (a) Needle-roller bearing. Note that flats have been worn on the rollers. (b) Abrasive wear caused by natural diamond dust (≤5 μm) that was deliberately introduced into the lubricant in the laboratory. Deep More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001231
EISBN: 978-1-62708-232-7
... Abstract The rim of a gear wheel of 420 mm width and 3100 mm in diam broke after four years of operation time in a sheet bar three-high rolling mill. The rim was forged from steel with about 0.4C, 0.8Si and 1.1Mn. The rim started to break in the tooth bottom from a fatigue fracture which...