What is included with this book?
Dr. Guangrui Zhu gained his PhD on engine valve train tribology at the University of Leeds, UK in 1988. He has worked in an industry-based R&D environment since then. He has published numerous journal and conference papers on journal bearings, trust bearings, mechanical seals, and valve trains.
Professor Chris Taylor has researched in the area of lubrication for over 30 years, with engine tribology being a major theme in recent times.
Series Editor's Foreword | p. xi |
Authors' Preface | p. xiii |
Notation | p. 1 |
Introduction | p. 5 |
Theoretical Formulation | |
Kinematics and Dynamics of the Cam and Follower | p. 11 |
Introduction | p. 11 |
Kinematic analysis of a cam and domed follower pair | p. 11 |
The load at the cam/follower interface | p. 13 |
The solution procedure | p. 15 |
References | p. 15 |
Hydraulic Lash Adjuster | p. 17 |
Introduction | p. 17 |
Check valve closed | p. 17 |
The dynamics of the plunger | p. 17 |
The governing equation of the displacement | p. 19 |
Numerical analysis | p. 20 |
Check value open | p. 21 |
The dynamics of the plunger | p. 21 |
The governing equation of the displacement | p. 23 |
Numerical analysis | p. 24 |
The numerical solution procedure | p. 24 |
The Maximum Hertzian Stresses | p. 25 |
Introduction | p. 25 |
The contact geometry | p. 25 |
The maximum Hertzian stress | p. 27 |
The pressure distribution | p. 27 |
The solution procedure | p. 27 |
References | p. 28 |
Asperity Interactions | p. 29 |
Introduction | p. 29 |
The asperity contact force | p. 29 |
The real area of contact | p. 29 |
The asperity contact functions | p. 30 |
The solution procedure | p. 30 |
References | p. 31 |
The Oil Film Thickness | p. 33 |
Introduction | p. 33 |
The lubricant entraining velocity | p. 33 |
The central and the minimum film thickness | p. 35 |
The solution procedure | p. 35 |
References | p. 36 |
Friction and Power Loss of the Valve Train | p. 37 |
Introduction | p. 37 |
The friction of the cam and follower interface | p. 37 |
The friction due to shear of the lubricant | p. 37 |
The friction due to asperity contact | p. 38 |
The friction of the follower and bush interface | p. 38 |
The tilting of the follower | p. 39 |
The friction model | p. 41 |
The friction of the valve and guide interface | p. 42 |
The friction of the valve stem and valve seal interface | p. 43 |
Power loss of the valve train | p. 43 |
The solution procedure | p. 44 |
References | p. 44 |
The Rotation of the Follower | p. 45 |
Introduction | p. 45 |
The governing equation of the follower rotation | p. 45 |
The driving torque of the cam/follower interface | p. 46 |
The resisting torque of the follower/bush interface | p. 48 |
The resisting torque of the valve stem/plunger interface | p. 49 |
The solution procedure | p. 49 |
References | p. 50 |
The Overall Solution Procedure and Input and Output Data | p. 51 |
Introduction | p. 51 |
Input data | p. 51 |
The kinematic analysis | p. 51 |
The analysis of the hydraulic lash adjuster | p. 51 |
Estimating the initial value of the follower rotational frequency | p. 52 |
The tribological analysis of the valve train | p. 54 |
The friction torque of the camshaft and average power loss | p. 54 |
The output data | p. 54 |
An Example of the Tribological Analysis of a Valve Train | p. 57 |
Introduction | p. 57 |
Parameters of the intake valve train of the ZETEC engine | p. 57 |
Results of the tribological analysis | p. 59 |
A brief discussion of the results | p. 59 |
References | p. 60 |
Experimental Study | |
Introduction to Experimental Study | p. 87 |
Preamble | p. 87 |
The background of the current experimental study | p. 88 |
The aim of the experimental study | p. 88 |
References | p. 89 |
Test Apparatus and the Instrumentation | p. 91 |
Introduction | p. 91 |
The hydraulic lash adjuster | p. 91 |
The data acquisition system | p. 91 |
Monitoring the follower rotation | p. 93 |
Locating the cam position | p. 94 |
Sampling the torque of the camshaft | p. 94 |
References | p. 95 |
Calibration of the Instrumentation and Commissioning Tests | p. 97 |
Introduction | p. 97 |
Calibration of the instrumentation | p. 97 |
The calibration to the torque measurement system | p. 97 |
The parasitic friction of the test apparatus | p. 99 |
The calibration for monitoring the follower rotation | p. 99 |
Commissioning tests | p. 100 |
Improving the signal for the follower rotation | p. 100 |
Tests at different camshaft rotational frequencies | p. 101 |
References | p. 101 |
The Test Procedure | p. 103 |
Introduction | p. 103 |
The running-in of the valve train | p. 103 |
The loop test | p. 103 |
The duration test | p. 104 |
Tests at different bulk temperatures | p. 105 |
References | p. 106 |
The Data Processing | p. 107 |
Introduction | p. 107 |
The torque on the camshaft | p. 107 |
The rotational frequency of the follower | p. 107 |
The camshaft trigger signal | p. 108 |
References | p. 109 |
Experimental Results and Discussions | p. 111 |
Introduction | p. 111 |
Experimental variables and the test condition | p. 111 |
Experimental results and discussions | p. 112 |
The friction torque and power loss of the valve train | p. 112 |
The rotational frequency of the follower | p. 113 |
Inspection of the cam and the follower | p. 121 |
Conclusions | p. 122 |
References | p. 124 |
Correlation of Theory and Experiments | |
Introduction to Correlation of Theory and Experiments | p. 127 |
The Experimental Evidence | p. 129 |
The Theoretical Predictions | p. 131 |
Introduction | p. 131 |
Kinematics and dynamics of the valve train | p. 131 |
The cam/follower interface | p. 131 |
The follower/bore interface | p. 132 |
The hydraulic lash adjuster | p. 133 |
The rotation of the follower | p. 133 |
References | p. 133 |
The Comparison of Results and Discussions | p. 135 |
Introduction | p. 135 |
The input data of the model simulating the test conditions | p. 135 |
The results of comparison and discussions | p. 137 |
The average friction torque | p. 137 |
The instantaneous torque on the camshaft | p. 140 |
The instantaneous friction torque on the camshaft | p. 140 |
The average follower rotational frequency | p. 145 |
The instantaneous follower rotational frequency | p. 146 |
Conclusions | p. 149 |
References | p. 149 |
Overall Conclusions | p. 151 |
Index | p. 153 |
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