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Bearing boxes

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001203
EISBN: 978-1-62708-235-8
.... Bearing boxes Overheating Welded joints Welded steel Joining-related failures (Other, general, or unspecified) fracture Three bearing bosses from the cover of scrap shears were sent in for examination. They had torn off the base plate to which they had been welded by fillet welds all around. Two...
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...
Image
Published: 01 December 2019
Fig. 11 Shaft surface exposed after removal of bearing ring; ( a ) adhered material (unetched) and ( b ) boxed region in (a) showing severely deformed grains 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
... Abstract Drastic reduction in the service life of a production gearbox was observed. Within the gearbox, the axial load on a bevel gear (8620 steel, OD 9.2 cm) was taken by a thrust-type roller bearing (3.8 cm ID, 5.6 cm OD) in which a ground surface on the back of the bevel gear served...
Image
Published: 01 June 2019
Fig. 1 The presence of secondary, branching intergranular stress-corrosion cracking (arrows) in a type 440C stainless bearing caused the analyst to overlook the real culprit — a mechanically initiated, primary transgranular crack that propagated through the steel's hard chromium carbide (box More
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
... of fracture indicated that bending stresses were primarily responsible, the alignment of the assembly was checked and it was found that the level of the inboard feet of the gear-box was 0.060 in. below that of the out-board feet and the bearing pedestal which carried the other end of the shaft, as indicated...
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
... crack in the transverse direction is shown in Fig. 13 . Crack propagation was by both transgranular and inter-granular processes. Fig. 11 Shaft surface exposed after removal of bearing ring; ( a ) adhered material (unetched) and ( b ) boxed region in (a) showing severely deformed grains...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001545
EISBN: 978-1-62708-236-5
... Abstract The presence of secondary, branching intergranular stress-corrosion cracking in a type 440C stainless bearing caused the analyst to overlook the real culprit, which was a mechanically-initiated, primary transgranular crack that propagated through the steel's hard chromium carbide...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
... 3 , 4 ). The 1947 paper ( Ref 3 ) discusses twist-off failures due to overheated bearings. This failure mode is referred to as a hot-box in railroad terminology. Almost all axle-journal failures were claimed to be attributed to intergranular embrittlement of the steel by molten brass or copper...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001665
EISBN: 978-1-62708-231-0
... is a simplified drawing of one end of the casting prepared from the original engineering drawings. It gives a general idea of the shape of the casting as seen from a direction perpendicular to the axis of the freight car. The journal box, within which one of the wheel-bearing axles rotated, is shown on the left...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001719
EISBN: 978-1-62708-231-0
... , Feb 1954 5. Laudig J.J. , Hot-Box Research Results..in the Iron-Back Journal Bearing , Rail. Age , Vol 134 ( No. 12 ), March 1953 , p 65 – 69 6. Vander Voort G. F. , Failure of Locomotive Axles , ASM Handbook , Vol 11 , 9th Edition , 1986 7. ASM Metals...
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
... Abstract The case study presented in this article details the failure investigation of an M50 alloy steel bearing used in a jet engine gearbox drive assembly. It discusses the investigative steps and analytic tools used to determine the root cause, highlighting the importance of continuous...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001152
EISBN: 978-1-62708-234-1
... worn out bearing or fits, and a broken rear axle tube of a bus are described. Crankshafts Thermal Stresses Tubes Welded joints St 37-2 40Mn4 Fatigue fracture Thermal and transformation stresses, resulting from welding, adding up with operational stresses can result in failure...
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
... Abstract An oil scavenge pump was found to have failed when a protective shear neck fractured during the start of a jet engine. Visual inspection revealed that the driven gear in one of the bearing compartments was frozen as was the corresponding drive gear. Spacer wear and thermal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001485
EISBN: 978-1-62708-225-9
... be present. It has also been found in the roller bearing axle-boxes of railway wagons which have been standing for some time in sidings and subjected to vibrations from passing trains. In many instances, the occurrence of stationary indentation remains unsuspected until the machine is started up, when...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001450
EISBN: 978-1-62708-231-0
... that was equipped with an automatic control to maintain the air-gas ratio at such a value that reducing conditions were obviated. It was also stated that the rivets had been inserted from the fireside, therefore the original heads would be on that side of the box. Microscopical examination revealed that while...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... not guarantee immunity, particularly where pronounced vibrations from diesel engines may be present. False brinelling has also been found in the roller-bearing axle boxes of railway cars that have been standing for some time in sidings and that are subjected to vibrations from passing trains. In many...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006834
EISBN: 978-1-62708-329-4
... Abstract This article is dedicated to the fields of mechanical engineering and machine design. It also intends to give a nonexhaustive view of the preventive side of the failure analysis of rolling-element bearings (REBs) and of some of the developments in terms of materials and surface...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
... to fretting wear. fretting wear impact fretting mechanical components normal load residual stress rolling-element bearings slip surface finish vibration frequency FRETTING is a wear phenomenon that occurs between two mating surfaces; initially, it is adhesive in nature, and vibration...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... and did reduce the microscope vibrations to an acceptable level. Case #4: Torsional Vibration on a Reciprocating Pump A 66 rpm reciprocating water pump driven by a gear box and belt reduction experienced excessive torsional vibration that was being picked up at the gear case when the pump...