Page 16 - Analysis and Design of Machine Elements

Contents
xiv
References 321
Problems 322
12 Sliding Bearings 329
12.1 Introduction 330
12.1.1 Applications, Characteristics and Structures 330
12.1.2 Types of Sliding Bearings 331
12.2 Working Condition Analysis 332
12.2.1 Friction 332
12.2.2 Wear 334
12.2.3 Lubrication 335
12.2.3.1 Newton’s Law of Viscous Flow 335
12.2.3.2 Viscosity of Lubricants 336
12.2.4 Formation of Hydrodynamic Lubrication in a Journal Bearing 337
12.2.4.1 Formation of Hydrodynamic Lubrication in Plates 337
12.2.4.2 Formation of Hydrodynamic Lubrication in a Journal Bearing 339
12.2.5 Potential Failure Modes 340
12.3 Load Carrying Capacities 340
12.3.1 Boundary-Lubricated Bearings 340
12.3.2 Hydrodynamically Lubricated Bearings 341
12.3.2.1 Reynolds Equation 341
12.3.2.2 Hydrodynamic Lubrication in a Journal Bearing 344
12.3.3 Heat Balance Analysis 347
12.4 Design of Sliding Bearings 349
12.4.1 Introduction 349
12.4.2 Materials for Sliding Bearings 349
12.4.2.1 Property Requirements for Sliding Bearing Materials 349
12.4.2.2 Commonly Used Bearing Materials 350
12.4.3 Lubricants, Their Properties and Supply 351
12.4.3.1 Lubricants 351
12.4.3.2 Lubricant Properties and Their Selection 352
12.4.3.3 Lubricant Supply 352
12.4.4 Design Criteria 353
12.4.5 Design Procedures and Guidelines 354
12.4.5.1 Design of Boundary-Lubricated Bearings 354
12.4.5.2 Design of Hydrodynamically Lubricated Bearings 354
12.4.6 Design Cases 355
References 360
Problems 360

13 Couplings and Clutches 365
13.1 Introduction to Couplings 366
13.1.1 Applications, Characteristics and Structures 366
13.1.2 Shaft Misalignments 366
13.1.3 Types of Couplings 367
13.2 Design and Selection of Couplings 375
13.2.1 Coupling Type Selection 375