Hydrostatic Lubrication (eBook)

Front Cover 1
Hydrostatic Lubrication 4
Copyright Page 5
Contents 8
List of main symbols 15
Chapter 1. HYDROSTATIC BEARINGS 18
1.1 INTRODUCTION 18
1.2 WORKING PRINCIPLE 18
1.3 ADVANTAGES AND DRAWBACKS 20
1.4 APPLICATIONS 21
1.5 TYPES OF BEARINGS 24
REFERENCES 31
Chapter 2. COMPENSATING DEVICES 32
2.1 INTRODUCTION 32
2.2 DIRECT SUPPLY SYSTEMS 33
2.3 COMPENSATED SUPPLY SYSTEM 34
2.4 THE COMMONEST SUPPLY SYSTEMS 47
2.5 HYDRAULIC CIRCUIT 48
REFERENCES 50
Chapter 3. LUBRICANTS 52
3.1 INTRODUCTION 52
3.2 MINERAL LUBRICANTS 53
3.3 SYNTHETIC LUBRICANTS 69
REFERENCES 69
Chapter 4. BASIC EQUATIONS 71
4.1 INTRODUCTION 71
4.2 NAVIER-STOKES AND CONTINUITY EQUATIONS 71
4.3 THE REYNOLDS EQUATION 75
4.4 THE LAPLACE EQUATION 82
4.5 LOAD CAPACITY, FLOW RATE, FRICTION 83
4.6 THE ENERGY EQUATION 85
4.7 LAMINAR FLOW THROUGH CHARACTERISTIC CONFIGURATIONS 86
4.8 FLOW INTO THE INLET LENGTH 96
4.9 INLET LOSSES 97
4.10 TURBULENT FLOW 97
4.11 THE FLOW IN ORIFICES 100
REFERENCES 102
Chapter 5. PAD COEFFICIENTS 104
5.1 INTRODUCTION 104
5.2 GENERAL STATEMENTS 104
5.3 CIRCULAR RECESS PAD 108
5.4 ANNULAR RECESS PADS 129
5.5 TAPERED PADS 140
5.6 SPHERICAL PADS 145
5.7 RECTANGULAR PADS 150
5.8 CYLINDRICAL PADS 155
5.9 HYDROSTATIC LIFTS 158
5.10 SCREW AND NUT ASSEMBLY 161
REFERENCES 163
Chapter 6. SINGLE PAD BEARINGS 166
6.1 INTRODUCTION 166
6.2 DIRECT SUPPLY 166
6.3 COMPENSATED SUPPLY 170
6.4 DESIGN OF SINGLE-PAD THRUST BEARINGS 189
Chapter 7. OPPOSED-PAD AND MULTIPAD BEARINGS 203
7.1 INTRODUCTION 203
7.2 OPPOSED-PAD BEARINGS 203
7.3 LEAD SCREWS 235
7.4 SELF-REGULATING BEARINGS 239
7.5 HYDROSTATIC SLIDEWAYS 246
7.6 MULTIPAD JOURNAL BEARINGS 250
REFERENCES 252
Chapter 8. MULTIRECESS BEARINGS 253
8.1 INTRODUCTION 253
8.2 ANALYSIS 253
8.3 MULTIRECESS JOURNAL BEARINGS 256
8.4 ANNULAR MULTIRECESS THRUST BEARINGS 277
8.5 TAPERED MULTIRECESS BEARINGS 280
8.6 SPHERICAL JOURNAL BEARINGS 292
8.7 YATES BEARINGS 296
REFERENCES 302
Chapter 9. HYBRID PLAIN JOURNAL BEARINGS 305
9.1 INTRODUCTION 305
9.2 PERFORMANCE OF THE HYBRID PLAIN JOURNAL BEARINGS 306
9.3 DESIGN OF HYBRID BEARINGS 313
9.4 CONCLUDING REMARKS 315
REFERENCES 317
Chapter 10. DYNAMICS 318
10.1 INTRODUCTION 318
10.2 EQUATION OF MOTION 319
10.3 PAD COEFFICIENTS 322
10.4 SUPPLY SYSTEMS 326
10.5 DYNAMICS OF SINGLE-PAD BEARINGS 337
10.6 OPPOSED-PAD BEARINGS 348
10.7 SELF-REGULATING BEARINGS 356
10.8 MULTIPAD BEARING SYSTEMS 360
10.9 MULTIRECESS JOURNAL BEARINGS 366
REFERENCES 377
Chapter 11. OPTIMIZATION 379
11.1 INTRODUCTION 379
11.2 GENERAL PROCEDURE 379
11.3 CONDITIONS OF MINIMUM 382
11.4 EFFICIENCY 382
11.5 DIRECT SUPPLY 383
11.6 OPTIMIZATION 402
11.7 REAL PADS 432
11.8 COMPENSATED SUPPLY 442
11.9 OPTIMIZATION 451
11.10 OTHER TYPES OF COMPENSATING ELEMENTS 460
11.11 REAL PADS 461
REFERENCES 463
Chapter 12. THERMAL FLOW 464
12.1 INTRODUCTION 464
12.2 TEMPERATURES IN THE BEARING 464
12.3 SUPPLY PIPELINE 473
12.4 COMPENSATING ELEMENTS 475
12.5 PUMP 475
12.6 COOLING PIPELINES 476
12.7 SELF-COOLING CAPILLARY TUBE 478
12.8 VISCOSITY AND TEMPERATURE 480
REFERENCES 481
Chapter 13. EXPERIMENTAL TESTS 482
13.1 INTRODUCTION 482
13.2 Hydrostatic systems 482
13.3 EXPERIMENTAL RIGS 485
REFERENCES 498
Chapter 14. APPLICATIONS 500
14.1 INTRODUCTION 500
14.2 MACHINE TOOLS 500
14.3 LARGE TILTING PADS 520
14.4 OTHER APPLICATIONS 528
14.5 HYDRAULIC CIRCUITS 530
REFERENCES 534
APPENDICES 536
A.1 SELF-REGULATED PAIRS AND SYSTEMS 536
A.2 DYNAMICS 538
A.3 THERMAL EXCHANGE 543
REFERENCES 548
Author index 550
Subject index 554