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