T2-1
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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
