Standard Handbook of Machine Design P35

CHAPTER 29 COUPLINGS Howard B. Schwerdlin Engineering Manager Lovejoy, Inc. Downers Grove, Illinois GENERAL/ RIGID COUPLINGS / FLEXIBLE METALLIC COUPLINGS / FLEXIBLE ELASTOMERIC COUPLINGS / UNIVERSAL JOINTS AND ROTATING-LINK COUPLINGS / METHODS OF ATTACHMENT / REFERENCES / BIBLIOGRAPHY / GLOSSARY OF SYMBOLS A b d D e E F g h / / Ka KL K5 L € m Area or parallel misalignment Bearing spacing Diameter Diameter or distance between equipment Eccentricity Young's modulus or shape factor for maximum allowable stress, psi Force Acceleration due to gravity Height of keyway Second moment. | CHAPTER 29 COUPLINGS Howard B. Schwerdlin Engineering Manager Lovejoy Inc. Downers Grove Illinois GENERAL RIGID COUPLINGS FLEXIBLE METALLIC COUPLINGS FLEXIBLE ELASTOMERIC COUPLINGS UNIVERSAL JOINTS AND ROTATING-LINK COUPLINGS METHODS OF ATTACHMENT REFERENCES BIBLIOGRAPHY GLOSSARY OF SYMBOLS A b d D Area or parallel misalignment Bearing spacing Diameter Diameter or distance between equipment e E F Eccentricity Young s modulus or shape factor for maximum allowable stress psi Force g h I J Ka kl Ks L I Acceleration due to gravity Height of key way Second moment of area Polar second moment of area U-joint angle correction factor U-joint life correction factor U-joint speed correction factor Life or length of engagement Length m Mass STANDARD HANDBOOK OF MACHINE DESIGN n N P PV Speed r min Number of active elements or bellows convolutions Pressure Pressure times velocity r R Rc Radius Operating radius Centroidal radius or distance s S t T V Maximum permissible stroke per convolution for bellows Link length shape factor or maximum permissible total bellows stroke Thickness Torque Velocity w X Y Width Angular misalignment Parallel misalignment a ß Ï 3 A c e 0eff T Rotational position Torsional amplitude U-joint angle Deflection or U-joint angle Deflection Damping ratio Shaft or joint angle Torsional equivalent angle Shear stress CO Angular velocity GENERAL System Requirements When selecting a coupling you have to consider all the system s requirements. It is not enough to know what the driver and load are and how big the shaft is. You must also know how the two halves are assembled and whether there is misalignment as well as the system s operating range and the operating temperature. Before you select a coupling determine the following about the system 1. Driver Type electric motor internal-combustion engine number of cylinders etc. 2. Load Fan pump rockcrusher etc. to .