xxi
CONTENTS
Title Page ………. i
Certificate of Approval ……….. iii
Certificate ……… v
Acknowledgements ……….. vii
Declaration ……….. ix
List of Symbols and Abbreviations……….. xi
List of Figures and Tables……….. xv
Abstract ……… xix
Contents ……… xxi
Chapter 1 A Unique Hydrostatic Motor with Epitrochoid Generated Rotor-stator and its Performance Problem .……… 1
1.1 Introduction ………. 1
1.2 Hydrostatic units with Epitrochoid generated rotor-stator 4 1.3 Literature Survey…… ………... 7
1.3.1 Orbital construction, Rotor-Stator Profiles and Kinematic of ORBIT motors ……….. 7
1.3.2 Major problems in ‘ORBIT’ Motors……… 12
1.4 Objectives and Scope………...…… 14
1.5 Organization of the thesis ………..………. 16
Contents
xxii
Chapter 2 Unification of Various Methods of Geometric Design of Constant difference Modified Epitrochoid to shape the
Star member ………..
172.1 Introduction ……… 17
2.2 Various Approaches of Constant Difference Modified Epitrochoid Profile Design ………...………….. 18
2.3 Unification.……… 23
2.4 Paradigm-1: Generation of Constant Difference Shifted Epitrochoid by Rolling the inside of a Lareger Circle on a Smaller Fixed Circle (Type 1 Cycloidal Motion)……. 24
2.4.1 Transformation to a different co-ordinate system for the purpose of unification……… 27
2.5 Paradigm-2: Cycloidal Gear Tooth Design Approach to Generate Epitrochoid……… 28
2.6 Unification of Approaches in Paradigm 1 and 2……….. 30
2.7 Paradigm-3: Generalized Conjugate Circular Pin Gear Design Approach………. 33
2.8 Transformation of Approach in section 2.7 into the Approach in Section 2.4………... 35
2.9 Summary………... 39
Chapter 3 Analysis of Active Contacts... 41
3.1 Introduction ………..……….. 41
3.2 Generation of Gap or Deformation at Active Contacts... 42
3.3 Interference Fit ………...………. 43
3.4 Contact Deformation due to Fluid Pressure……..……… 53
3.5 Summary ……….. 55
Contents
xxiii
Chapter 4 Computation, Results and Discussion on Deformations and Gaps at Active Contacts and some
relevant Effects…………...………. 57
4.1 Introduction……….. 57
4.2 Computations on few sets of star-ring of ORBIT motors. 58 4.3 Deformation of ORBITAL units at ideal fit of Star-Ring (Set 5) with Fluid Pressure ……… 70
4.4 Estimation of Deformation and Leakages at Active Contacts - FEM Approach ... 75
4.5 Summary………. 75
Chapter 5 Epilogue……… ………… 77
5.1 General Conclusion………... 77
5.2 Observations and Results in brief.……… 78
5.3 Scope of future work… ……… 79
References ………. 81
Appendix A1.1 LSHT Hydrostatic Transmission (HST) system 87 Appendix A2.1 Double Geometric Generations of Epitrochoid 93 Appendix A2.2 Equation of the Envelope of Unmodified Epitrochoid ………. 95
Appendix A2.3 Phases in ORBIT Motor .……….. 97
Appendix A2.4 Flow Chart of Computational Methodology… 113
Contents
xxiv