Failures 2Scuffing

8/3/2019 Failures 2Scuffing

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MichaelisTU MünchenB.-R. Höhn

GEAR FAILURES

Scuffing

Dr.-Ing. Klaus Michaelis

Forschungsstelle für Zahnräder und GetriebebauGear Research Centre

Head of the Institute: Prof. Dr.-Ing. B.-R. Höhn

Course at the University of Ljubljana


Typical Load Carrying Capacity Limitsof Case Carburized Gears 4/144.12.28




Flank Failures in Gears9/111.05.18

continuous abrasive wear

instantaneous adhesive scoringscuffing

fatigue micropittingpitting


Light Scoring Marks10/144.03.24




Scoring with one Scuffing Stripe15/144.03.24


Scuffing Stripes16/144.03.24




Light Scuffing16/144.03.24


Severe Scuffing20/144.03.24




Photos, Profile and Lead Diagrams ofCorresponding Scuffing Failures on Pinion and Gear 4/125.01.20

acc. Collenberg


Material Transfer on a Scuffed Pinion Flank1/59.15.18

acc. Michaelis




Material Transfer in the Addendum of the Pinion3/125.02.20

micro section

SEM photo

acc. Collenberg


Typical SEM Photos of Transferred Materialat High Speed Conditions 3/125.02.20

acc. Collenberg




Mechanism of Lubrication of Oils with Additives(schematic) 3/59.06.5

acc. Michaelis


Influence of Viscosity on Scuffing Load Capacityfor Pure Mineral FVA Reference Oils 3/111.04.17

loadstage

scuffing torque pinion

FVA oil no.

gravimetricvisual

acc. Michaelis




Influence of TCP Additive Concentration onScuffing Load Capacity 4/111.04.17

loadstage

acc. Michaelis


Influence of Type of Additive onScuffing Load Capacity of Turbine Oils 7/125.02.20

acc. Collenberg




Influence of Relative Slidingon Scuffing Load Capacity 11/111.05.24

acc. Lechner


Measurement of Surface Roughness4/100.05.18

acc. Prexler




Measurement of Surface RoughnessDetermination of Parameters of Material Portion 5/100.05.18

acc. Prexler


Influence of Surface Roughnesson Scuffing Load Capacity 13/59.15.18

acc. Michaelis




Influence of Copper Platingon Scuffing Load Capacity 15/59.15.18

acc. Michaelis


Influence of Tip Reliefon Scuffing Load Capacity 7/59.15.18




Influence of Austenite Contenton Scuffing Load Capacity 14/59.15.18


Influence of Oil Temperatureon Scuffing Load Capacity 6/144.12.28

acc. Michaelis




Temperature Distribution and Film Formation 22/133.02.29

acc. Schlenk


Influence Factors on Scuffing Load CapacityTransmittable Torque

42/106.03.18




Gear Oil Testing MachinesPrinciples 10/73.04.13


Scuffing Load Ratings in Different Test Rigs11/73.04.13

acc. Wirtz




Scuffing Load Ratings in Different Test Rigs17/59.11.12

acc. Michaelis


FZG Back-to-Back Gear Test RigSchematic

7/144.12.28




FZG Back-to-Back Gear Test Rig


Geometrical Data of Test Gears Type A1/144.03.24




Load and Speed Distribution of Test Gears Type A11/59.15.18


Test Gear Box




Standard FZG Scuffing Test A/8,3/905/73.09.14


Main Influence Factors on the Resultof an FZG Scuffing Test 9/144.03.24




Load Stages of the FZG Gear Oil Test4/144.03.24


Result of an FZG Standard Scuffing Test A/8,3/90Gravimetric Method

6/73.09.14




Results of the FZG Scuffing Test A/8,3/908/73.09.14


Frequently Used Test Modificationsof the FZG Scuffing Test A/8,3/90

8/144.03.24




Test Regime of Standard Scuffing Tests1/144.10.27


Modifications of theStandard FZG Scuffing Test A/8,3/90

7/144.03.24




Comparison of Different Scuffing Test Methods2/144.10.27


Test Lubricants4/144.10.27




Results of Industrial and Transmission Gear Oils11/144.15.31

0

100

200

300

400

500

600

700

800

2

14

13

12

11

10

98764

C1 C2 C3 G1A G3 G4

GL3 GL4 GL4+

A/8.3/90 A10/16.6R/90 S-A10/16.6R/90

G6 G7

GL5


Results of Transmission OilsIn the Shock Test S-A10/16,6R/90

6/144.10.27




Scuffing Integral Temperaturefor Different Test Methods

5/144.10.27

0

100

200

300

400

500

600

700

800

9001000

3 4 5 6 7 8 9 10 11 12 13 14

load stage

s c u f f i n g t e m p e r a t u r eϑ i n t S

i n ° C

S-A10/16,6R/90

A10/16,6R/90

A/8,3/90


Temperature Distribution along the Path of Contact5/59.15.18




Comparison of Total Contact Temperatureand Integral Temperature Criteria

4/59.10.13


Scuffing Load Carrying Capacity RatingAccording to Integral Temperature Criteria

4/73.05.11




Permissible Integral Temperature 5/73.05.11


Scuffing Integral Temperature from FZG Test A/8,3/90 5/73.05.11




Scuffing of Pinion and Gear of a Railway Gearset 35,36/106.03.17

pinion

gear


Torque-Speed Diagram of a Locomotive34/106.03.17

design point forscuffing calculation

driving

breaking

locomotivespeed

pinion speed

p i n i o n

t o r q u e




Main Data of a Railway Gearset 5/111.08.19

Failures 2Scuffing

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