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UNS H48200
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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001501
EISBN: 978-1-62708-221-1
... was continuous high overload that may also have contributed to the bearing displacement. Bearings Bevel gears Differential gears Displacement Lift trucks Mechanical drives 4820H UNS H48200 Fatigue fracture Rolling-contact wear A spiral bevel gear and pinion set that showed “excessive wear...
Abstract
A spiral bevel gear and pinion set that showed "excessive wear on the pinion teeth" was submitted for analysis. This gear set was the primary drive unit for the differential and axle shafts of an exceptionally-large front-end loader in the experimental stages of development. There was no evidence of tooth bending fatigue on either part. Several cracks were associated with the spalling surfaces on the concave sides of the 4820H NiMo alloy steel pinion teeth. The gear teeth showed no indication of fatigue. The primary mode of failure was rolling contact fatigue of the concave (drive) active tooth profile. The spalled area was a consequence of this action. The pitting low on the profile appeared to have originated after the shift of the pinion tooth away from the gear center. The shift of the pinion was most often due to a bearing displacement or malfunction. The cause of this failure was continuous high overload that may also have contributed to the bearing displacement.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001500
EISBN: 978-1-62708-221-1
... diagonally across the profile of the loaded side, which was consistent on every tooth. Agricultural equipment Bevel gears Design Loads (forces) Tractors 4820H UNS H48200 Rolling-contact wear Fatigue fracture A spiral bevel gear and pinion set was submitted for examination and evaluation...
Abstract
A ‘worn-out’ spiral bevel gear and pinion set was submitted for examination and evaluation. This was a spiral bevel drive set with the gear attached to a differential. The assembled unit was driving a new, large, experimental farm tractor in normal plowing and tilling operations. The primary failure was associated with the 4820H NiMo alloy steel pinion, and thus the gear was not examined. The mode of failure was rolling contact fatigue, and the cause of failure improper engineering design. The pattern of continual overload was restricted to a specific concentrated area situated diagonally across the profile of the loaded side, which was consistent on every tooth.