Contents
CONTRIBUTORS ................................................ii PREFACE ..................................................xiii ACKNOWLEDGMENTS ............................................xv BASICS SECTION 1. CHAIN BASICS ....................................1 1.1 WHAT IS A CHAIN? ....................................1 1.1.1 Basic Structure of Power Transmission Chain . . . . . . . . . . . . 2 1.1.2 Basic Structure of Small Pitch Conveyor Chain . . . . . . . . . . . 4 1.1.3 Basic Structure of Large Pitch Conveyor Chain— Engineering Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.4 Functions of Chain Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 ADVANTAGES AND DISADVANTAGES OF CHAIN FOR POWER TRANSMISSION AND CONVEYORS ..................6 1.2.1 Power Transmission Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2.2 Conveyance Uses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 SPROCKETS ........................................8 2. CHAIN DYNAMICS ................................9 2.1 CHAINS UNDER TENSION ...............................9 2.1.1 Elastic Stretch, Plastic Deformation, and Breakage . . . . . . . . . 9 2.1.2 Engagement with Sprockets . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2 CHAIN DRIVE IN ACTION ...............................15 2.2.1 Chordal Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.2 Repeated Load Tension, Fatigue Failure . . . . . . . . . . . . . . . 17 2.2.3 Transmission Capability of Drive Chains . . . . . . . . . . . . . . . 19 2.2.3.1 Difference Between Linear Tension and Wrapping . . 19 2.2.3.2 Effect of Normal Chain Wear on Fatigue Strength . . . 20 2.2.3.3 Strength Differences Between Chain and the Connecting Links and Offset Links . . . . . . . . . . . . . 20 2.2.4 Wear of Working Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.2.5 Noise and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.3 CHARACTERISTIC PHENOMENA IN CONVEYOR CHAIN .........24 2.3.1 Coefficient of Friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.3.2 Dynamic Tension of Starting and Stopping . . . . . . . . . . . . . 26 2.3.3 Wear Between Rollers and Bushings . . . . . . . . . . . . . . . . . . 27
v
Made with FlippingBook Digital Proposal Creator