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Gear Failures Pitting
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Transcript of Gear Failures Pitting
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8/12/2019 Gear Failures Pitting
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MichaelisTU MnchenB.-R. Hhn
GEAR FAILURES
Pitting
Dr.-Ing. Klaus Michaelis
Forschungsstelle fr Zahnrder und Getriebebau
Gear Research Centre
Head of the Institute: Prof. Dr.-Ing. B.-R. Hhn
Course at the University of Ljubljana
MichaelisTU MnchenB.-R. Hhn
Pitting on Case Carburized Gear3/144.06.24
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MichaelisTU MnchenB.-R. Hhn
Pitting and Micropitting4/144.06.24
MichaelisTU MnchenB.-R. Hhn
Pitting on Through Hardened Gear1/148.03.24
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MichaelisTU MnchenB.-R. Hhn
Surface Failure on Nitrided Gears17/144.04.24
MichaelisTU MnchenB.-R. Hhn
Subsurface Stress Distribution in a Gear Contact9/76.00.5
acc. Oster
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MichaelisTU MnchenB.-R. Hhn
Pitting Development10/44.01.1
acc. Rettig
MichaelisTU MnchenB.-R. Hhn
White Etching Area (Butterfly) in the Area of
Maximum Subsurface Shear Stress 16/104.01.13
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MichaelisTU MnchenB.-R. Hhn
Pitting Area Development as a Function
of Flank Pressure and Number of Load Cycles 6/107.03.17
acc. Oster
MichaelisTU MnchenB.-R. Hhn
Influence of the Nominal Viscosity on
the Pitting SN-Curve 2/104.06.17
acc. Knauer
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MichaelisTU MnchenB.-R. Hhn
Influence of the Operating Temperature on
the Pitting SN-Curve 1/104.06.17
acc. Knauer
MichaelisTU MnchenB.-R. Hhn
Influence of the Additive System on
the Pitt ing SN-Curve of Case Carburi zed Gears 5/51.01.4
acc. Kser
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MichaelisTU MnchenB.-R. Hhn
Influence of the Additive System on
the Pitti ng SN-Curve of Through Hardened Gears 4/51.01.4
acc. Kser
MichaelisTU MnchenB.-R. Hhn
Influence of the Base Oil on the Pitting SN-Curve
of Through Hardened Gears and Discs 2/100.05.18
acc. Simon
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MichaelisTU MnchenB.-R. Hhn
Influence of Film Thickness on Pitting Life
of Through Hardened Discs 7/101.01.12
acc. Simon
MichaelisTU MnchenB.-R. Hhn
Influence of Surface Roughness on Pitting Life
of Through Hardened Discs 9/100.06.18
acc. Prexler
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MichaelisTU MnchenB.-R. Hhn
Influence of Case Depth on
the Pitt ing SN-Curve of Case Carburi zed Gears 6/91.01.10
acc. Kser
MichaelisTU MnchenB.-R. Hhn
Relative Pitting Life of Through Hardened Discs7/100.06.18
acc. Simon
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MichaelisTU MnchenB.-R. Hhn
Influence Factors on Pitting
Transmittable Torque40/106.03.18
MichaelisTU MnchenB.-R. Hhn
Standard FZG Pitti ng Test C-PT/9:10/9013/73.09.14
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MichaelisTU MnchenB.-R. Hhn
Pitting SN-Curves for tw o Different Lubricants
Schematic3/144.12.28
MichaelisTU MnchenB.-R. Hhn
Test Conditions of Different Pitting Test Methods10/144.12.28
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MichaelisTU MnchenB.-R. Hhn
Low (LLS) and High (HLS) Load Spectrum
for Pitting Test11/144.12.28
MichaelisTU MnchenB.-R. Hhn
Results of the Standard FZG Pitting Test
9th Torque Stage, Oil Temperature 90 and 120 C3/157.02.27
acc. Schedl
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MichaelisTU MnchenB.-R. Hhn
Results of the Standard FZG Pitting Test
10th Torque Stage, Oil Temperature 90 C4/157.02.27
acc. Schedl
MichaelisTU MnchenB.-R. Hhn
Results of the Standard FZG Pitting Test
in Comparison to the Load Spectrum Pitting Test12/144.12.28
acc. Schedl
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MichaelisTU MnchenB.-R. Hhn
Schematic Design of a Cycl ic FZG Gear Test Rig2/144.02.24
MichaelisTU MnchenB.-R. Hhn
Cyclic FZG Gear Test Rig
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MichaelisTU MnchenB.-R. Hhn
Load Spectrum Type I7/144.02.24
MichaelisTU MnchenB.-R. Hhn
Pitting Test under Load and Temperature
Spectrum Conditions FZG PITS Test8/144.02.24
run-in 1st oil fill 2nd oil fill
running time
0 70 h 140
expected failurereference oil
oil change
oil = 1.0pit = 0,5
oil = 1.0pit = 1.0
acc. Wei
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MichaelisTU MnchenB.-R. Hhn
Results for Different Automotive Gear Oils
In the FZG PITS Test9/144.02.24
0
0,2
0,4
0,6
0,8
1
1,2
1,4
1,6
1,8
2
2,2
reference oil GL4-oil-2 engine oil total drive line oil
lubricant
50% failure probability
(GL4-oil-1)
acc. Wei
MichaelisTU MnchenB.-R. Hhn
Main Influence Factors on the Result
of an FZG Pitting Test 1/144.06.24
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MichaelisTU MnchenB.-R. Hhn
Pitting Load Carrying Capacity Rating
According to DIN/ISO 63362/83.01.7
MichaelisTU MnchenB.-R. Hhn
Permissible Surface Stress 13/83.01.7
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MichaelisTU MnchenB.-R. Hhn
Endurance Limit of Surface Stress 3/91.01.10
MichaelisTU MnchenB.-R. Hhn
Operating Modes of a Tilting Converter8/106.03.15
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MichaelisTU MnchenB.-R. Hhn
Converter Gearbox (Schematic)9/106.03.15
MichaelisTU MnchenB.-R. Hhn
Light Initial Pitting on Through Hardened Sun P210/106.03.15
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MichaelisTU MnchenB.-R. Hhn
Severe Pitting on Through Hardened Sun P111/106.03.15
MichaelisTU MnchenB.-R. Hhn
Operating Spectrum of Converter Gearbox12/106.03.15
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MichaelisTU MnchenB.-R. Hhn
Comparison of Load Spectra and SN-Curves13/106.03.15
MichaelisTU MnchenB.-R. Hhn
Lubrication of Mesh Between Planet and Ring Gear14/106.03.15
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MichaelisTU MnchenB.-R. Hhn
Pitting and Scuffing on Bevel Pinion Tip2/59.12.16