Technique

Choice of double cardan joints

Choice of the cardan joint according to the maximum torque

This section presents the maximum torque parameters for which the selection of the most suitable double cardan joint is determined.

Mt_max	maximum sizing torque
Mt_s	starting torque
Mt_m	drive torque
i_max	maximum transmission ratio
i_r	distribution ratio
Mt_a	grip torque
P	maximum weight on the axle
r_s	wheel radius under static load
µ	Friction coefficient
i_f	final reduction ratio of the wheel

To choose the coupling, use the maximum torque value given by formula 1 (if the starting torque is greater than the grip torque) or by formula 2 (if the grip torque is at least double the starting torque).
To calculate the starting torque and the grip torque , use formulas 3 and 4 respectively.

Maximum transmissible torque as a function of the angle of inclination

Mt_max	maximum transmissible torque
ß	angle of inclination

The maximum torque that can be transmitted by a double cardan joint decreases as the angle of inclination increases, between the main shaft and the shaft secondary, according to the curve of fig. 1.
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