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Pillow Block Bearing

Pillow block bearing is an independent bearing unit that can provide support, load, and fix functions, and reduce friction resistance. Pillow block bearings are generally a unit composed of gray cast iron, ductile cast iron or cast steel bearing housings, rolling bearings and related sealing structures, fasteners, etc.

Pillow block bearing generally has a sealing mechanism and is filled with an appropriate amount of grease to ensure the normal operation of pillow block bearing during the lubrication cycle, and can provide relubrication oil injection holes.

Pillow block bearings are generally divided into two types, intergrated type and split type, which can be selected according to different installation occasions and requirements. The split bearing housing(also called as plummer blocks) is of upper and lower halves, and the bearings in the bearing housing also have a split type or an integral type.

The types of pillow block bearings include ball bearings, roller bearings and tapered roller bearings, etc., depending on the load and work requirements.

The fixing method of pillow block bearing and the shaft generally adopts a set screw, an eccentric sleeve, etc.

Plummer Block

The upper cover and base of the split bearing housing could be separated to mainly carry radial loads.

Pillow Block

Vertical housing ball bearing unit/flange housing ball bearing unit/vertical housing roller bearing unit/flange housing roller bearing unit

Special Housing / Pillow Blocks With Different Material

It is composed of ball bearings with seats mounted in bearing housings or flange housings, and grease has been injected into the units and seals have been installed in them.

How to Choose Pillow Block Bearing?

  • Shaft diameter or bore of pillow block bearing: calculate the loads according to the customer's selection, and determine the shaft diameter or the bore of pillow block bearing with sufficient rigidity and deflection.

  • Shaft height position: Determine the height of the shaft center from the mounting base of pillow block bearing according to the structure size of the mechanism.

  • The shaft maximum speed: According to the working speed of the shaft, we determine whether the limit speed of the bearing with a seat can meet the application requirements.

  • The maximum load of the pillow block bearing: According to the load of the entire shafting system, the load of pillow block bearing would be verified, including the fatigue life of the bearing and the strength of the pillow blocks.

  • Misalignment performance: According to the misalignment information required in the shafting design, select the appropriate type and configuration of pillow block bearing.


The Installation of Pillow Block Bearing

Mounting steps for pillow block bearing:

  • Check whether the position tolerance of the connecting hole at the mounting position of pillow block bearing and the flatness of the fixed base surface of pillow block bearing meet the requirements.

  • Clean pillow block bearing and pillow block bearing to be installed on the base position and the surface of the shaft with a cleaning agent to keep the surface free of impurities and dust, and coat the surface with a layer of anti-rust oil.

  • Install the shaft into the bore of inserted bearing, during the installation process, only use tools such as a rubber hammer or nylon rod to strike the end face of the insert bearing's inner race to move, and do not strike other positions of other bearing housings.

  • After pillow block bearing is installed in the proper position of the shaft, fix pillow block bearing on the base, and tighten the bolts according to the specified torque requirements.

  • After installing the pillow block bearings at both ends, the shaft should be able to move axially between the bearing holes with a certain amount of force, which can ensure good alignment of pillow block bearing at both ends. Otherwise, it is necessary to reposition and adjust pillow block bearing.

  • Use appropriate torque to alternately tighten the eccentric sleeves on the inner ring of the bearing at both ends to ensure that the bearing is firmly fastened to the shaft.


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