Schaeffler Product catalogue - medias
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Roller chain idler sprocket units

Idler pulley units

Features
   

Roller chain idler
sprocket units

 

INA roller chain idler sprocket units are guidance and return units for roller bush chains and roller chains. They can compensate for chain stretch resulting from operation and give smoother system running under high loads and speeds.

 
 

The ready-to-fit units comprise sprockets and deep groove ball bearings or radial insert ball bearings. The sprockets are made from high strength steel, sintered iron or plastic (polyamide). Sprockets made from plastic give particularly smooth running and generate very little noise. Since the inner ring of the deep groove ball bearing is extended on both sides, no additional spacer rings are required.

 
 

In series KSR..-B0, the inner ring is located on the shaft by means of a locking collar. The bearing bore of this series has a plus tolerance. As a result, unmachined shafts up to ISO tolerance h9 can be used under moderate loads and speeds.

 
   

Sealing

 

The deep groove ball bearings are sealed on both sides.

 
   

Lubrication

 

They are greased using a lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
to GA13 and are maintenance-free.

 
   

Idler pulley units

 

Idler pulley units are tensioning systems for belt drives and idler units. They:

 
 
  • increase the wrap angle in belt drives and can therefore support higher power levels or allow smaller units to be used
  • compensate for belt stretch resulting from operation
  • allow shorter centre distances
  • reduce the wear
    Undesirable change to dimensions and/or surfaces of materials due to frictional forces
    on the belt drive.
 
 

The ready-to-fit units comprise deep drawn, profiled sheet steel pulley halves riveted together and deep groove ball bearings. Pulleys of larger diameters are additionally welded together. A lead chamfer on the pulley profile prevents damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the belt. Due to the sheet steel construction, the additional rotating masses and the out of balance masses generated are low.

 
 

Type A is suitable for vee belts, type B for flat, vee and round belts, type D for round belts, steel cables and hemp ropes.

 
   

Sealing

 

The deep groove ball bearings are sealed on both sides.

 
   

Lubrication

 

They are greased using a lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
to GA13 and are maintenance-free.

 
   

Operating temperature

 

Roller chain idler sprocket units with steel or sintered iron sprockets are suitable for operating temperatures from –20 °C to +120 °C.

 
 

Roller chain idler sprocket units with plastic sprockets are suitable for operating temperatures from –20 °C to +80 °C.

 
 

Idler pulley units are suitable for operating temperatures from –20 °C to +120 °C, limited by the grease
See
Lubricant
Grease cartridge
Fatty acids
and seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material.

 
   
  
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