Drive Shafts
 

DANA Industrial Drive Shafts Catalogue

Technical directions for application
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Load on bearings of the connected units

Axial forces
For the design of a cardan shaft it must be taken into account that axial forces can occur. These must be absorbed by axial thrust bearings of the connected units.

Axial forces will occur during length variations in the cardan shaft. Additional axial forces are caused increasing torque and by increasing pressure during lubrication of the splines. This force will decrease automatically and can be accelerated by the installation of a relief valve.

The axial force Ak is a combination of two components:

1. Frictional force FRL
This is the force that occurs in the length compensation.

It can be determined from:
FRL = Frictional force from the length compensation [N]
It depends on:
T = Torque of the cardan shaft [Nm]
rm = Pitch circle radius in the sliding parts of the cardan shaft [m]
µ = Friction coefficient (depends on the spline-treatment):
0,08 for plastic-coated splines
0,11 for steel/steel (greased)
β = Operating deflection angle



2. Force FP
This force occurs in the length compensation due to the increasing pressure in the lubritation grooves of the cardan shaft.

The force depends on the lubrication pressure (max. perm. pressure 15 bar).

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