Long life pillow block bearings UB208, chrome steel gcr15

A pillow block, also known as a plummer block or bearing housing, is a pedestal used to provide support for a rotating shaft with the help of compatible bearings & various accessories. Housing material for a pillow block is typically made of cast iron or cast steel.

Pillow blocks are usually referred to the housings which have a bearing fitted into them & thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments & generally are meant for lesser loads of general industry. These differ from "plummer blocks" which are bearing housings supplied without any bearings & are usually meant for higher load ratings & corrosive industrial environments. However the terms pillow-block & plummer-block are used interchangeably in certain parts of the world.

The fundamental application of both types is the same which is to primarily mount bearings safely enabling their outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings are either split type or unsplit type. Split type housings are usually two piece housings where the cap and base can be detached, while certain series are one single piece housings. Various seals are provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the expensive bearings to freely rotate, hence increasing their performance and duty cycle.

Bearing housings are usually made of grey cast iron. However various grades of metals can be used to manufacture the same.

Comparison of Physical Properties of Typical Pillow Block Housing Material

pillow blocks are usually made of cast iron and are mainly intended for grease lubricated ball or roller bearings.

For extra heavy duty applications, ductile iron or cast steel pillow blocks are available.

Special Note on Location of Bearings in Pillow

Blocks

If the bearing is to be held (located), fixing rings are inserted

between the side faces of the outer ring and the housing

shoulders. If an adapter sleeve is used to secure the bearing

to the shaft and only one fixing ring is required, it should be

placed on the same side of the bearing as the locknut. The

bearing is then displaced from its central position in the housing by a distance equal to half the fixing ring width.

1 ring - on the same side as the sleeve nut

2 rings - one on each side of the bearing

3 rings - two on the same side as the sleeve nut

4 rings - two on each side of the bearing

Note:

As opposed to a held bearing - a free bearing is mounted

without fixing rings. The bearing positioned in the centre of the

bearing seat in the pillow block housing will ensure proper

lubrication as well as shaft expansion and contraction.

CLUNT CHINA pillow block bearing  UB204:

duct details:

The bearing we can offer as follows: 

Parts models of pillow block bearings