 # SIZING AND SELECTION DRIVE SHAFT COUPLINGS

Symbols

 A Overall length (mm) AB Distance between flextures (mm) AB = (A – 2xN) Z Tube length (mm) Z = (A – 2xH) H Length of coupling ends (mm) N Length to flexture (mm) TAS Peak torque of the drive (Nm) φ Torsional deflection (degree) CTB Torsional stiffness of both flexible elements (Nm/rad) CTZWR Torsional stiffness per 1m of tubing (Nm/rad) CTZA Total torsional stiffness (Nm/rad) nk Critical speed (1/min.) CTdynE Dynamic torsional stiffness of both elastomer inserts (Nm/rad) CTdynEZ Total torsional stiffness (Nm/rad)

## According to torsional stiffness

Condition: Line shaft ZA, size 1.500 TAS = 1.500 Nm
Wanted: Total torsion stiffness CTZA

## According to torsional deflection

Condition: Line shaft ZA, size 1.500 TAS = 1.500 Nm
Wanted: Torsional deflection at maximum acceleration torque TAS

Measurement (A) of the line shaft = 1,5 m
Length (Z) of tubing = A - (2xH) = 1,344 m

With a maximum torque of 1.500 Nm the torsional deflection is 0,21°.

## R+W Calculation Program

Using proprietary software, R+W will calculate the specific mechanical details of exactly the model you plan to use. Overall length, tube materials (e.g. steel, aluminum, CFK), and other factors are used to determine a number of performance values unique to your line shaft coupling.

 Critical Speed nk 1/min. Torsional stiffness of tubing CTZWR Nm/rad Overall stiffness CTZA Nm/rad Torsional deflection φ Grad-Min-Sec Total weight m kg Moment of inertia J kgm2 Maximum misalignment ΔKr mm