机械零件设计 双语教程PDF电子书下载

Chapter 1 Introduction 1

1.1 The Meaning of Design 1

1.2 Design of Mechanical Systems 2

1.3 Design as a Multi-Disciplinary Endeavor 2

1.4 Design of Machine Elements and Role of Failure Prevention Analysis 4

1.5 Fundamental Design Considerations 5

Chapter 2 Fundamentals for Strength Design 7

2.1 Design for Static Strength 7

2.1.1 Factor of Safety 8

2.1.2 Stress Concentration 11

2.2 Fatigue and Cyclic Stresses 13

2.2.1 Fatigue 13

2.2.2 Cyclic Stress 13

2.3 Design for Cyclic Loading 14

2.3.1 Design for Fatigue Stress 15

2.3.2 Design for Finite Life 17

2.4 Failure Criteria and Modes of Mechanical Failure 18

Chapter 3 Introduction to Tribology 21

3.1 Friction 21

3.2 Wear 22

3.2.1 Adhesive Wear 22

3.2.2 Abrasive Wear 23

3.2.3 Fatigue Wear 23

3.3 Lubrication 24

Chapter 4 Power Transmission Shafting，Couplings，Keys and Splines 26

4.1 Uses and Characteristics of Shafting 26

4.2 Potential Failure Modes 27

4.3 Shaft Materials 28

4.4 Design for Static Loads 29

4.5 Reversed Bending and Steady Torsion 30

4.6 Shaft Design Procedure 30

4.7 Couplings，Keys，and Splines 33

4.7.1 Couplings 33

4.7.2 Keys and Splines 37

Chapter 5 Sliding Bearings 42

5.1 Types of Bearings 42

5.2 Uses and Characteristics of Sliding Bearings 42

5.3 Potential Failure Modes 43

5.4 Sliding Bearing Materials 44

5.5 Boundary-Lubricated Bearing Design 44

5.6 Hydrodynamic Bearing Design 46

5.6.1 Lubricant Properties 46

5.6.2 Petroff’s Friction Analysis 48

5.6.3 Hydrodynamic Lubrication Theory—Reynolds Equation 49

5.6.4 Design Considerations in Hydrodynamic Journal Bearings 50

5.6.5 Bearing Performance—An Evaluation Example 52

5.6.6 Optimization Techniques 58

Chapter 6 Rolling Element Bearings 60

6.1 Characteristics of Rolling Element Bearings 60

6.2 Types of Rolling Element Bearings 61

6.3 Potential Failure Modes 63

6.4 Bearing Materials 64

6.5 Bearing Selection 64

6.5.1 Basic Load Ratings 65

6.5.2 Reliability Specifications 66

6.5.3 Suggested Selection Procedure for Steady Loads 66

6.6 Mounting and Enclosure 69

6.6.1 Mounting 69

6.6.2 Preloading 71

6.6.3 Alignment 72

6.6.4 Enclosures 72

Chapter 7 Power Screw Assemblies 76

7.1 Uses and Characteristics of Power Screws 76

7.2 Potential Failure Modes 78

7.3 Materials 78

7.4 The Mechanics of Power Screws 79

7.5 Suggested Power Screw Design Procedure 82

Chapter 8 Threaded Joints 84

8.1 Selection of Joint Type and Fastening Method 84

8.2 Threaded Fasteners 85

8.3 Screw Thread Standards and Terminology 86

8.4 Strength under Static Load 89

8.4.1 Joints Designed without Initial Stress 90

8.4.2 Joints Designed for Axially Loaded Threaded Parts 91

8.4.3 Joints Designed with Initial Stress 91

8.4.4 Joints Designed for Shear-Loaded Threaded Parts 95

8.5 Load Distribution between Threaded Parts in a Group Joint 96

8.6 Tightening and Locking 97

8.6.1 Tightening Torque 97

8.6.2 Locking Methods 98

Chapter 9 Springs 100

9.1 Types and Characteristics of Springs 100

9.2 Potential Failure Modes 101

9.3 Spring Materials 102

9.4 Axially Loaded Helical-Coil Springs;Stress 103

9.5 Deflection and Spring Rate 106

9.6 Buckling Analysis of Helical Compression Springs 108

9.7 Procedure and General Guidelines for Spring Design 109

Chapter 10 Gears 112

10.1 Types of Gears 112

10.2 Potential Failure Modes 114

10.3 Gear Materials and Heat Treatment 116

10.4 Force Analysis for Spur Gears 117

10.5 Stress Analysis and Design for Spur Gears 118

10.5.1 Calculation of Teeth Surface Strength for Spur Gears 118

10.5.2 Calculation of Teeth Bending Strength for Spur Gears 124

10.6 Designing of Helical Gears 130

10.6.1 Load Analysis for Helical Gears 130

10.6.2 Calculation of Teeth Surface Strength for Helical Gears 131

10.6.3 Calculation of Teeth Bending Strength for Helical Gears 131

10.7 Summary of Gear Design 132

10.7.1 Suggested Design Procedure 132

10.7.2 Some Consideration in the Design of Gears 132

10.8 Structural Design of Pinions and Gears 133

10.9 Lubrication 135

Chapter 11 Worm Gears 136

11.1 Worm Gears and Worms;Nomenclature，Materials 136

11.2 Main Parameters and Geometrical Calculations 137

11.3 Force Analysis 140

11.4 Stress Analysis and Design 141

11.5 Structural Design of Worm and Gears 143

11.6 Lubrication and Heat Dissipation 144

11.6.1 Efficiency of Wormset 144

11.6.2 Lubrication and Heat Dissipation 145

Chapter 12 Brakes and Clutches 147

12.1 Types of Brakes and Clutches 147

12.2 Potential Failure Modes and Materials Selection 148

12.3 Basic Concepts for Design of Brakes and Clutches 149

12.4 Band Brakes 150

12.5 Disk Brakes and Clutches 152

Chapter 13 Belt Drives 155

13.1 Characteristics of Belt Drives 155

13.2 Potential Failure and Belt Materials 156

13.3 Flat Belts 157

13.4 V-Belts 159

13.5 Synchronous Belts 166

Appendix 168

References 173