机械零件设计 第8版 缩编版 英文版pdf电子书版本下载

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Introduction 1

I-1 Problem Solving and Design 1

I-2 The Design Process 3

I-3 Stages of Design 5

I-4 Finding and Using Information in Machine Design 7

I-5 Recognized Standards for Design 9

I-6 Computational Tools for Machine Design 12

I-7 Conclusions 14

References 15

CHAPTER 1 WORKING STRESSES AND FAILURE THEORIES 16

1-1 Failure and Phenomenological Failure Theories 17

1-2 Stress Concentration Caused by Sudden Change in Form 20

1-3 Design for Cyclic Loading 34

1-4 Conclusions 50

References 51

Problems 52

CHAPTER 2 DESIGN OF SHAFTS 63

2-1 Torsion of Circular Shaft 65

2-2 Maximum Static Shearing Stress 71

2-3 Design of Shafts for Fluctuating Loads 72

2-4 Keys 79

2-5 Stress Concentration 82

2-6 Couplings 83

2-7 Bending Loads in Two Planes 86

2-8 Deflection of Shaft of Nonuniform Diameter 88

2-9 Materials Used for Shafting 90

References 92

Problems 92

CHAPTER 3 SPRINGS 104

3-1 Helical Springs 105

3-2 Properties of Spring Materials 110

3-3 Hot-Formed Springs 113

3-4 Helical Spring of Minimum Volume of Material-Static Load 114

3-5 Optimum Design of Helical Spring 117

3-6 Fatigue of Springs 121

3-7 Design for Fluctuating Loads 122

3-8 Buckling of Compression Springs 126

3-9 Effect of End Turns for Compression Springs 126

3-10 Helical Extension Springs 127

3-11 Helical Springs with Torsional Loading 128

3-12 Leaf Springs 130

3-13 Belleville Spring 133

3-14 Rubber Springs 135

References 140

Problems 141

CHAPTER 4 SCREWS 145

4-1 Kinds of Threads 145

4-2 Effect of Initial Stress 148

4-3 Additional Design Considerations 152

4-4 Power Screws 154

4-5 Torque Required to Produce Desired Clampling Force 161

4-6 Friction of Screws 163

4-7 Stress Concentration 163

4-8 Locknuts 165

4-9 Materials and Methods of Manufacture 166

4-10 Stress Due to Impact Load 167

4-11 Relaxation 170

References 170

Problems 170

CHAPTER 5 BELTS,CLUTCHES,BRAKES AND CHAINS 177

5-1 V-belts 178

5-2 Center Distance for V-belt Drive 180

5-3 Design of V-belts 183

5-4 Other Types of Belts 186

5-5 Disk or Plate Clutch 187

5-6 Roller Chains 191

5-7 Design Capacity of Roller Chains 192

5-8 Galling of Roller Chains 197

5-9 Polygonal Action 197

5-10 Silent Chain 198

References 198

Problems 198

CHAPTER 6 LUBRICATION 203

6-1 Viscosity and Newton's Law 205

6-2 Petroff's Bearing Equation 212

6-3 Load-Carrying Journal Bearing 215

6-4 Load and Friction Curves for Journal Bearings 216

6-5 Power Lost in Friction 223

6-6 Designing for Film Temperature and Minimum Film Thickness 223

6-7 Viscosity Index 225

6-8 The Zn/P Curve 226

6-9 Bearing Materials 228

6-10 Bearing Loads 231

6-11 Construction of Bearings 232

6-12 Clearance and Oil Grooves 233

6-13 Dry Friction 235

6-14 Boundary or Thin-Film Lubrication 237

6-15 Mixed or Semifluid Lubrication 238

References 238

Problems 239

CHAPTER 7 BALL AND ROLLER BEARINGS 244

7-1 Construction and Types of Ball Bearings 244

7-2 Selection of Ball Bearings 246

7-3 Effect of Axial Load 251

7-4 Design for Variable Loading 253

7-5 Static Capacity 257

7-6 Design for Different Confidence Levels 257

7-7 Friction and Lubrication of Ball Bearings 258

7-8 Bearing Materials and Surface Finish 259

7-9 Mounting of Ball Bearings 260

7-10 Permissible Misalignment 261

7-11 Relative Advantages of Rolling Element Bearings 262

7-12 Roller Bearings 263

7-13 Contact Stress between Spheres and Cylinders 264

References 273

Problems 273

CHAPTER 8 SPUR GEARS 278

8-1 Introduction 280

8-2 Load on Gear Tooth from Power Transmitted 281

8-3 Determination of Bearing Loads 283

8-4 Materials for Gears 284

8-5 Lubrication and Mounting of Gears 285

8-6 Design of Gears to Prevent Failures 286

References 305

Problems 306

CHAPTER 9 HELICAL,BEVEL,AND WORM GEARS 310

9-1 Helical Gears 311

9-2 Tooth Loads of Helical Gears 313

9-3 Design of Parallel Shaft Helical Gears to Prevent Failures 314

9-4 Loads on Bevel Gears 320

9-5 Design of Bevel Gears to Prevent Failures 321

9-6 Forces in Worm Gear Sets 330

9-7 Design of Worm Gear Sets 331

References 335

Problems 335

APPENDIX 338

中英文词汇对照表 386