The Ohio State University, Dept。 of Mech。 Eng。 Columbus, Ohio

March 2005 B。S。 Mechanical Engineering The Ohio State University Columbus, Ohio

March 2005 – Present Research Engineer

The Gear and Power Transmission Research Laboratory

The Ohio State University Columbus, Ohio

FIELDS OF STUDY

Major Field:  Mechanical Engineering

TABLE OF CONTENTS

ABSTRACT ii

DEDICATION iv

ACKNOWLEDGEMENTS v

VITA vi

LIST OF TABLES x

LIST OF FIGURES xi

NOMENCLATURE xvi

CHAPTER 1: INTRODUCTION 1

1。1 Background and Motivation 1

1。2 Literature Review 3

1。3 Scope and Objective 6

1。4 Thesis Outline 8

CHAPTER 2: TWO-DISK TEST METHODOLOGY 9

2。1 Two-Disk Test Machine 9

2。2 Test Specimens 15

2。3 Test Procedures 22

2。3。1 Traction Tests 23

2。3。2 Wear Tests 29

2。3。3 Scuffing Tests 30

2。4 Inspection Procedures 33

2。4。1 Surface Roughness Settings 33

CHAPTER 3: TWO-DISK TEST RESULTS 38

3。1 Introduction 38

3。2 Traction Tests 38

3。2。1 Measured Friction Coefficient Curves 43

3。3 Wear Tests 48

3。3。1 Wear Test Results 51

3。4 Scuffing Tests 56

3。4。1 Scuffing Test Results 59

CHAPTER 4: EVALUATION OF GEAR EFFICIENCY PERFORMANCE OF

SURFACE TREATMENTS 71

4。1 Introduction 71

4。2 Gear Efficiency Test Methodology 72

4。2。1 Test Set-up 72

4。2。2 Test Specimens and Test Matrix 75

4。2。3 Test and Inspection Procedures