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Gear boxes

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Published: 01 June 2019
Fig. 1 Arrangement of gear box and hoist barrel showing position of fracture and error in alignment. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001470
EISBN: 978-1-62708-220-4
... Abstract One 49-in. impeller of a two-stage centrifugal air compressor disrupted without warning, causing extensive damage to the casings, the second impeller, and the driving gear box. Prior to the mishap, the machine had run normally, with no indications of abnormal vibration, temperature...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001466
EISBN: 978-1-62708-221-1
... arising from misalignment were responsible for the fatigue failure, which occurred in a region of stress concentration where insignificant fillet radius had been provided. Bend properties Gear boxes Hoists Stress concentration Alloy steel Fatigue fracture This shaft, which carried both...
Image
Published: 01 December 2019
Fig. 27 Macroscopic view of failed case-hardened steel planetarygear from a centrifugal gear-box. Note the blackened inside diameter and temper colours at the end surface More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047964
EISBN: 978-1-62708-223-5
... of the grinding machine was reconditioned to eliminate the undulations and retained austenite was minimized by careful heat treatment. Bevel gears Cracks Gear boxes Magnetic particle testing Spalling Surface grinding 8620 UNS G86200 Rolling-contact wear The service life of a production gearbox...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001792
EISBN: 978-1-62708-241-9
... stress concentration increases with increasing sharpness in the geometrical discontinuity. In the marine engine evaluated in this study, the gearbox shaft and clutch shaft are located in the gear box unit. Gearbox shaft transmits power from gearbox to propeller shaft, while clutch shaft helps...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0092155
EISBN: 978-1-62708-221-1
... of the specified surface hardness of 58 HRC. Ferrite Gear boxes Nitriding 4140 UNS G41400 Heat treating-related failures (Other, general, or unspecified) distortion Slipping of components in the left-side final drive train of a tracked military vehicle was detected after the vehicle had been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047939
EISBN: 978-1-62708-225-9
... surfaces of the bearing. As a remedial action, the bearing was insulated for protection from stray currents by grounding of the motor and the moisture was kept out by sealing both bearings in the assembly. Electrolytic etching Gear boxes Grounding (electrical) Roller bearings 8620 UNS G86200...
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
..., however, because the bushing had only a few microns of clearance. The effect caused the oil to squeeze out, resulting in metal-to-metal contact, and ultimately failure. Aircraft components Gear boxes Oil pumps Overheating Thermal stresses 32CrMoV 13 (Other, miscellaneous, or unspecified...
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
... the consideration and control of many interrelated factors. Bending fatigue Gear boxes Helical gears Lubrication Scuffing Carburized steel Fatigue fracture Abrasive wear In an industrial application, 24 speed-increaser gearboxes were used to transmit 258 kW (346 hp) and increase speed from 55...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001799
EISBN: 978-1-62708-241-9
... Inspection (DPI) of the assembly was carried out to find evidence of cracking but no crack (s) or crack-like indications were detected. The gear was reinstalled in the assembly, and after two days of service abnormal sounds were heard, emerging from the gear box. Operation was suspended again for inspection...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001300
EISBN: 978-1-62708-215-0
... properties 4140 UNS G41400 Rolling-contact wear Fatigue fracture Background Applications The gear is part of a coal pulverizer, built in 1978. The bull gear was driven by a pinion gear at 100 to 200 rpm. The pinion gear was reportedly undamaged. The gear box is sealed and uses extra pressure...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001844
EISBN: 978-1-62708-241-9
... Abstract A cylindrical spiral gear, part of a locomotive axle assembly, cracked ten days after it had been press-fit onto a shaft, after which it sat in place as other repairs were made. Workers at the locomotive shop reported hearing a sound, and upon inspecting the gear, found a crack...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001754
EISBN: 978-1-62708-241-9
... in the gear box or engine. Eventually, however, the second visitation led to the identification of debris in an engine chip detector that the customer initially deemed inconsequential. The chip detector itself was composed of a strong magnet in a cagelike filter that had trapped the non-magnetic debris...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001763
EISBN: 978-1-62708-241-9
... gear box, the rotating shaft usually endures loadings associated with torsion and bending moments, producing a steady torsion stress and cyclic bending stress. As a result, the shafts are susceptible to fatigue failure during the operation [ 1 ]. In this study, the reverse shaft was used...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001786
EISBN: 978-1-62708-241-9
... The Short Bed Heavy Duty [ 1 ] conventional Lathe of Beco make housed at CWD, IGCAR was procured in the year 1991. It is used for machining large diameter components. It has a power house with a motor of capacity 40 hp. Main parts are head stock (head stock gear train, main spindle, feed gear box, and chuck...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001424
EISBN: 978-1-62708-233-4
.... Adequate rigidity is particularly important where alignment under load must be maintained, e.g., in the case of engine crankcases, and it is significant that some manufacturers of internal combustion engines, heavy gear boxes and similar plant have reverted to the use of cast-iron after a period of trial...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001812
EISBN: 978-1-62708-241-9
... markings on fracture surfaces. Fig. 27 Macroscopic view of failed case-hardened steel planetarygear from a centrifugal gear-box. Note the blackened inside diameter and temper colours at the end surface Fig. 28 Macroscopic view of fracture surface of planetary gear shown in previous figure...
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
...-scanning, and scratch tests. After a discussion on gear scuffing, information on the material-dependent adhesive wear and factors preventing adhesive wear is provided. adhesive wear coefficient of friction galling metal sliding contacts scoring scuffing seizure scratch tests twist compression...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001756
EISBN: 978-1-62708-241-9
... of the engine are low-pressure (LP) NGVs, LP turbine rotor disk and shaft coupled to fan, rotor support system, exhaust mixer and cone, afterburner system, gear box, and accessories. Reported Problem Loud noise along with severe vibration of the engine was experienced during flying. Subsequently, engine...