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Startup Ridging Failures at Very Large Radii: The Case of Thrust Collars.

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Title: Startup Ridging Failures at Very Large Radii: The Case of Thrust Collars.
Authors: Heinrich, Christian1 (AUTHOR) heinrich@imw.tu-clausthal.de, Lohrengel, Armin1 (AUTHOR)
Source: Tribology Transactions. Mar/Apr2026, Vol. 69 Issue 2, p217-228. 12p.
Subjects: Thrust bearings, Hertzian contact stresses, Mechanical loads, Boundary lubrication, Lubricant additives, Spur gearing, Gearing machinery, Journal bearings
Abstract: Thrust collars were previously dimensioned against mixed lubrication failures using one single Hertzian pressure limit. In this paper, a striking radius dependence of permissible Hertzian pressures is found. This radius dependence can be used to connect failure limits of spur gears, hypoid gears, thrust collars, and journal bearings (ordered from low to high reduced radii). The failure load can be increased significantly by using active extreme pressure (EP) additives. This slow-speed EP additive usage is a different use case than the traditional high-speed scuffing one; the variation between additives turns out to be much higher. Phosphating and hardening likewise lead to large increases in failure load. Crowning and roughness variations are further investigated influences. The arising ridging failure mechanism is established to be mainly due to the increased interaction length of the long and low-gradient lubrication gap at high radii. [ABSTRACT FROM AUTHOR]
Copyright of Tribology Transactions is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 192207308
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Startup Ridging Failures at Very Large Radii: The Case of Thrust Collars.
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  Data: <searchLink fieldCode="AR" term="%22Heinrich%2C+Christian%22">Heinrich, Christian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> heinrich@imw.tu-clausthal.de</i><br /><searchLink fieldCode="AR" term="%22Lohrengel%2C+Armin%22">Lohrengel, Armin</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Tribology+Transactions%22">Tribology Transactions</searchLink>. Mar/Apr2026, Vol. 69 Issue 2, p217-228. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Thrust+bearings%22">Thrust bearings</searchLink><br /><searchLink fieldCode="DE" term="%22Hertzian+contact+stresses%22">Hertzian contact stresses</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+lubrication%22">Boundary lubrication</searchLink><br /><searchLink fieldCode="DE" term="%22Lubricant+additives%22">Lubricant additives</searchLink><br /><searchLink fieldCode="DE" term="%22Spur+gearing%22">Spur gearing</searchLink><br /><searchLink fieldCode="DE" term="%22Gearing+machinery%22">Gearing machinery</searchLink><br /><searchLink fieldCode="DE" term="%22Journal+bearings%22">Journal bearings</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Thrust collars were previously dimensioned against mixed lubrication failures using one single Hertzian pressure limit. In this paper, a striking radius dependence of permissible Hertzian pressures is found. This radius dependence can be used to connect failure limits of spur gears, hypoid gears, thrust collars, and journal bearings (ordered from low to high reduced radii). The failure load can be increased significantly by using active extreme pressure (EP) additives. This slow-speed EP additive usage is a different use case than the traditional high-speed scuffing one; the variation between additives turns out to be much higher. Phosphating and hardening likewise lead to large increases in failure load. Crowning and roughness variations are further investigated influences. The arising ridging failure mechanism is established to be mainly due to the increased interaction length of the long and low-gradient lubrication gap at high radii. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Tribology Transactions is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1080/10402004.2025.2582043
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 12
        StartPage: 217
    Subjects:
      – SubjectFull: Thrust bearings
        Type: general
      – SubjectFull: Hertzian contact stresses
        Type: general
      – SubjectFull: Mechanical loads
        Type: general
      – SubjectFull: Boundary lubrication
        Type: general
      – SubjectFull: Lubricant additives
        Type: general
      – SubjectFull: Spur gearing
        Type: general
      – SubjectFull: Gearing machinery
        Type: general
      – SubjectFull: Journal bearings
        Type: general
    Titles:
      – TitleFull: Startup Ridging Failures at Very Large Radii: The Case of Thrust Collars.
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            NameFull: Heinrich, Christian
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            NameFull: Lohrengel, Armin
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            – D: 01
              M: 03
              Text: Mar/Apr2026
              Type: published
              Y: 2026
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            – TitleFull: Tribology Transactions
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