KWS Manufacturing

Screw Conveyor End Bearings

Nomenclature Flanged Roller Bearing Flanged Ball Bearing Pillow Block Roller Bearing Pillow Block Ball Bearing


End Bearings Diagram

End bearings provide support at one or both ends of a screw conveyor and must be designed to handle radial and thrust loads as well as shaft runout.

Radial load as measured at the end bearing is half the weight of the last screw section. Radial loads act at right angles to the shaft centerline or bearing axis of rotation. Radial loads are typically negligible at the screw conveyor end shaft. However, end bearings located at the drive end of a screw conveyor are subject to higher radial loading due to the weight of the gear reducer and motor or overhung loads from chain and sprocket drives.

Thrust load is the reaction through the conveyor screws from the movement of a bulk material. Thrust loads are also called axial loads and act parallel to the shaft centerline or bearing axis of rotation. The end bearing on the drive end must prevent axial movement of the screw. Any axial movement of the screw could allow contact with the hanger bearings or trough ends. KWS recommends locating the drive unit and thrust bearing at the discharge end of a screw conveyor, placing the screws in tension and preventing misalignment when the conveyor is heavily loaded.

Shaft runout occurs when the shaft rotates in an eccentric pattern about the centerline axis. Shaft runout is caused by the minor amount of “bend” inherent in any screw due to the manufacturing process. Shaft runout must be accounted for at the bearings to avoid premature bearing failure. KWS recommends using a fixed thrust bearing at the drive end and a ball or spherical roller bearing at the tail end.

Nomenclature

End Bearings Nomenclature
End Bearings - Flanged Roller Bearing

Flanged Roller Bearing

Flanged roller bearings are mounted directly to standard trough ends on the drive end of a screw conveyor. The flanged roller bearing housing contains two sets of tapered bearings that are designed to withstand the thrust of the bulk material being conveyed.

End Bearings -Flanged Ball Bearing

Flanged Ball Bearing

Flanged ball bearings are mounted directly to standard trough ends on the tail end of a screw conveyor. The ball bearing housing contains one set of ball bearings that are designed to withstand radial loads only.

End Bearings - Pillow Block Roller Bearing

Pillow Block Roller Bearing

Pillow block roller bearings are mounted to pedestal trough ends on the drive end of a screw conveyor. The flanged roller bearing housing contains two sets of tapered or spherical bearings that are designed to withstand the thrust of the bulk material being conveyed.

End Bearings - Pillow Block Ball Bearing

Pillow Block Ball Bearing

Pillow block ball bearings are mounted to pedestal trough ends on the tail end of a screw conveyor. The ball bearing housing contains one set of ball bearings that are designed to withstand radial loads only.

Roller Bearing Flange Unit

End Bearings - Roller Bearing Flange Unit
Shaft Dia. A B C D E Bolt Dia. Part Number Weight (Lbs.)
1” NOT AVAILABLE
1-1/2” 4–1/8” 5-3/8” 3-3/8” 1-3/16” 1/2” EBF112R* 11
2” 4–3/8” 5-5/8” 3-1/2” 1-3/16” 1/2” EBF2R* 12
2-7/16” 5-3/8” 6-7/8” 4” 1-1/2” 5/8” EBF2716R* 20
3” 6” 7-3/4” 4-1/2” 1-5/8” 3/4” EBF3R* 26
3-7/16” 7” 9-1/4” 5” 1-7/8” 3/4” EBF3716R* 50
3-15/16” 7-1/2” 10-1/4” 6-1/4” 2-1/8” 7/8” EBF31516R 75
4-7/16” 8-3/4” 10-7/8” 7-3/4” 2-7/16” 7/8” EBF4716R 90

* KWS Stock Component



Ball Bearing Flange Unit

End Bearings - Ball Bearing Flange Unit
Shaft Dia. A B C D E Bolt Dia. Part Number Weight (Lbs.)
1” 2-3/4” 3-3/4” 1-3/8” 1/2” 7/16” EBF1BB* 2
1-1/2” 4” 5-1/8” 2” 1/2” 1/2” EBF112BB* 5
2” 5-1/8” 6-1/2” 2-1/4” 11/16” 5/8” EBF2BB* 10
2-7/16” 5-5/8” 6-7/8” 2-3/8” 5/8” 5/8” EBF2716BB* 11
3” 6 ” 7-3/4” 3-1/16” 7/8” 3/4” EBF3BB* 22
3-7/16” 6-3/4” 8-7/16” 3-3/8” 1” 3/4” EBF3716BB* 28
3-15/16” NOT AVAILABLE
4-7/16” NOT AVAILABLE

* KWS Stock Component     – All Flange Bearings Include 1/8″ Alemite Fitting



Roller Bearing Pillow Block

End Bearings - Roller Bearing Pillow Block
Shaft Dia. A B C
Bolt Dia.
D E F G H Part Number Weight (Lbs.)
1” NOT AVAILABLE
1-1/2” 3-3/8” 1-1/4” 1/2” 6-1/4” 7-7/8” 2-3/8” 4-1/4” 2-1/8” EBP112R 10
2” 3-1/2” 1-5/16” 5/8” 7” 8-7/8” 2-1/2” 4-1/2” 2-1/4” EBP2R 12
2-7/16” 4” 1-5/8” 5/8” 8-1/2” 10-1/2” 2-7/8” 5-1/2” 2-3/4” EBP2716R 20
3” 4-1/2” 1-7/8” 3/4” 9-1/2” 12” 3” 6-1/4” 3-1/8” EBP3R 28
3-7/16” 5” 2-1/4” 7/8” 11” 14” 3-1/2” 7-1/2” 3-3/4” EBP3716R 46
3-15/16” 6-1/4” 2-7/16” 3/4”• 12-1/2” 15-1/4” 4-1/2” 8-7/16” 4-3/4” EBP31516R• 69
4-7/16” 6-3/4” 2-3/4” 3/4”• 13-1/2” 16-5/8” 4-5/8” 9-5/16” 4-3/4” EBP4716R• 85

• Uses a 4 bolt base instead of 2.



Ball Bearing Pillow Block

End Bearings - Ball Bearing Pillow Block
Shaft Dia. A B C Bolt Dia. D E F G H Part Number Weight (Lbs.)
1” 3/4” 9/16” 3/8” 4-1/8” 5-1/2” 1-7/16” 2-3/4” 1-7/16” EBP1BB 2
1-1/2” 1-3/16” 15/16” 1/2” 5-1/2” 7-1/4” 1-15/16” 4-3/16” 2-1/8” EBP112BB 6
2” 1-3/8” 7/8” 5/8” 7” 8-7/8” 2-3/8” 4-15/16” 2-1/2” EBP2BB 9
2-7/16” 1-7/16” 15/16” 3/4” 8” 10-3/4” 2-5/8” 6-1/16” 3” EBP2716BB 16
3” 1-1/2” 1-1/4” 7/8” 9” 11-3/4” 3” 6-15/16” 3-1/2” EBP3BB 21
3-7/16” 1-5/8” 1-5/16” 7/8” 11” 14” 3-3/8” 8” 4” EBP3716BB 32
3-15/16” NOT AVAILABLE  
4-7/16” NOT AVAILABLE