gear failures pitting

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


Pitting on Case Carburized Gear3/144.06.24


2/222


Pitting and Micropitting4/144.06.24


Pitting on Through Hardened Gear1/148.03.24


3/223


Surface Failure on Nitrided Gears17/144.04.24


Subsurface Stress Distribution in a Gear Contact9/76.00.5

acc. Oster


4/224


Pitting Development10/44.01.1

acc. Rettig


White Etching Area (Butterfly) in the Area of

Maximum Subsurface Shear Stress 16/104.01.13


5/225


Pitting Area Development as a Function

of Flank Pressure and Number of Load Cycles 6/107.03.17

acc. Oster


Influence of the Nominal Viscosity on

the Pitting SN-Curve 2/104.06.17

acc. Knauer


6/226


Influence of the Operating Temperature on

the Pitting SN-Curve 1/104.06.17

acc. Knauer


Influence of the Additive System on

the Pitt ing SN-Curve of Case Carburi zed Gears 5/51.01.4

acc. Kser


7/227


Influence of the Additive System on

the Pitti ng SN-Curve of Through Hardened Gears 4/51.01.4

acc. Kser


Influence of the Base Oil on the Pitting SN-Curve

of Through Hardened Gears and Discs 2/100.05.18

acc. Simon


8/228


Influence of Film Thickness on Pitting Life

of Through Hardened Discs 7/101.01.12

acc. Simon


Influence of Surface Roughness on Pitting Life

of Through Hardened Discs 9/100.06.18

acc. Prexler


9/229


Influence of Case Depth on

the Pitt ing SN-Curve of Case Carburi zed Gears 6/91.01.10

acc. Kser


Relative Pitting Life of Through Hardened Discs7/100.06.18

acc. Simon


10/2210


Influence Factors on Pitting

Transmittable Torque40/106.03.18


Standard FZG Pitti ng Test C-PT/9:10/9013/73.09.14


11/2211


Pitting SN-Curves for tw o Different Lubricants

Schematic3/144.12.28


Test Conditions of Different Pitting Test Methods10/144.12.28


12/2212


Low (LLS) and High (HLS) Load Spectrum

for Pitting Test11/144.12.28


Results of the Standard FZG Pitting Test

9th Torque Stage, Oil Temperature 90 and 120 C3/157.02.27

acc. Schedl


13/2213



10th Torque Stage, Oil Temperature 90 C4/157.02.27

acc. Schedl



in Comparison to the Load Spectrum Pitting Test12/144.12.28

acc. Schedl


14/2214


Schematic Design of a Cycl ic FZG Gear Test Rig2/144.02.24


Cyclic FZG Gear Test Rig


15/2215


Load Spectrum Type I7/144.02.24


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


16/2216


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


Main Influence Factors on the Result

of an FZG Pitting Test 1/144.06.24


17/2217


Pitting Load Carrying Capacity Rating

According to DIN/ISO 63362/83.01.7


Permissible Surface Stress 13/83.01.7


18/2218


Endurance Limit of Surface Stress 3/91.01.10


Operating Modes of a Tilting Converter8/106.03.15


19/2219


Converter Gearbox (Schematic)9/106.03.15


Light Initial Pitting on Through Hardened Sun P210/106.03.15


20/2220


Severe Pitting on Through Hardened Sun P111/106.03.15


Operating Spectrum of Converter Gearbox12/106.03.15


21/2221


Comparison of Load Spectra and SN-Curves13/106.03.15


Lubrication of Mesh Between Planet and Ring Gear14/106.03.15


22/22


Pitting and Scuffing on Bevel Pinion Tip2/59.12.16

gear failures pitting

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