T2-1                  www.vibrationmounts.com  Phone:  516.328.3662  Fax:  516.328.3365 Technical Section: Shaft Couplings Table of Contents   1.0  INTRODUCTION   2.0  APPLICATION CONSIDERATIONS 2.1 Torque and Horsepower  .............................................................................................................................. T2-2 2.2 Shaft Misalignment ......................................................................................................................................T2-2 2.3 Lateral and Axial Flexibility of Couplings  ..................................................................................................... T2-3 2.4 Torsional Flexibility....................................................................................................................................... T2-3 2.5 Backlash   .....................................................................................................................................................T2-3 2.6 Rotational Velocity Error .............................................................................................................................. T2-3 2.7 Service Conditions ....................................................................................................................................... T2-3   3.0  GENERAL CLASSIFICATION OF COUPLINGS AND THEIR PERFORMANCE CHARACTERISTICS 3.1 Rigid Couplings  ...........................................................................................................................................T2-4 3.2 Misalignment-Compensating Couplings ...................................................................................................... T2-5 3.2.1 Selection Criterion for Frictional Misalignment-Compensating Couplings ................................... T2-5 3.2.1a Oldham Couplings ............................................................................................................ T2-5 3.2.1b Universal or U-joints ......................................................................................................... T2-6 3.2.1b.1 General ............................................................................................................ T2-6 3.2.1b.2 Kinematics  ....................................................................................................... T2-7 Example 1: Determining the Maximum Inertia Torque ................................................................ T2-7 3.2.1b.3 Joint Selection (Torque Rating) ........................................................................ T2-9 Example 2: Universal Joint Selection for Continuous Operation  ................................................ T2-9 Example 3: Universal Joint Selection for Intermittent Operation with Shock Loading  ................ T2-9 Example 4: Determining the Maximum Speed of an Input Shaft  ................................................ T2-9 3.2.1b.4 Secondary Couples ........................................................................................ T2-10 3.2.1b.5 Joints in Series ............................................................................................... T2-10 Example 5: Determining the Maximum Speed of an Input Shaft in a Series .............................. T2-10 Example 6 ....................................................................................................................................... T2-11 3.2.2 Selection Criterion for Misalignment-Compensating Couplings with Elastic Connectors....................................................................................................................... T2-11 3.2.2.1 Designs of Elastic Misalignment-Compensating Couplings ............................................. T2-11 3.3 Torsionally Flexible Couplings and Combination Purpose Couplings .......................................................... T2-12 3.3.1 Torsionally Flexible Couplings ..................................................................................................... T2-12 3.3.2 Combination Purpose Couplings ................................................................................................. T2-13 3.3.2.1 Miscellaneous Combination Purpose Couplings .............................................................. T2-15 3.3.2.1a Flexible Shafts  ................................................................................................. T2-15 3.3.2.1b Uniflex Couplings ............................................................................................. T2-15 3.3.2.1c Jaw and Spider Couplings ............................................................................... T2-16 3.3.2.1d Sleeve Type Couplings (Geargrip) ................................................................... T2-17   4.0  REFERENCES.......................................................................................................................................................T2-17