Gearboxes: Motor Mounting

There is need for a proper mesh between motor pinion and first gear wheel, to avoid a reduction of torque loadability and an increase of noise.

Therefore, some dimensional tolerances (in picture below in red) of the motor must meet a specification.



The motor shaft is loaded by torque, but also by a lateral force.
It depends on torque level and diameter of the motor pinion.
This is not the case for planetary gearboxes, because of several planets in mesh with the pinion.

Use of an inclined teeth pinion (see picture) results in axial force additionally.
Direction of this force depends on direction of rotation.

This must be considered for motor bearing design, for noise emission and lifetime.


Synchronous motor UPU (diameter 64mm)