Pulley with internal bearings

A pulley with internal bearings is a pulley with a non-rotating ("dead") shaft and bearings located inside of the pulley. This type of pulley design offers many advantages compared to a pulley with external bearings and is recommended by us in many cases.

Pulley with internal bearings (spherical roller bearings) and our patentented QLR hybrid seal

Advantages of the internal bearing pulley design

  • Lower weight - this means less material, lower transportation costs, lower load on the supporting structures and a bit simpler assembling process;
     
  • Lower weight of rotating parts and consequently better energy efficiency, reduction of wear, lower belt tension forces during acceleration (start/stop) and lower load on the bearings of the pulley;
     
  • More compact design due to reduced shaft length and therefore less space required;
     
  • Efficient seals ensure longer bearing service life;
     
  • A more cost-effective design compared to a similar pulley with external bearings can generally be achieved. This is made possible by the fact that no bearing units and clamping sets are required and more cost-effective - although no less efficient - seals from our own production are used.


What is the difference to a conveyor idler roller?

The main difference between a pulley with internal bearings and an idler roller is the application: The idler rollers do not have the function of changing the belt guidance and should consequently never have wrap angles greater than 1°- 2°. The wrap angle of the pulleys - including the pulleys with internal bearings - is considerably greater. This means that the load on the pulley always depends heavily on the local belt tension.

 

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