A pillow block, also called a plummer block or bearing housing, is often a pedestal utilized to provide support for a rotating shaft by using suitable bearings & a variety of accessories. Housing materials for a pillow block is usually made from cast iron or cast steel.
To make sure efficient sealing, pillow blocks and plummer blocks can be found with a various special seal choices and end covers. Benefits will include a facility for simple mounting and dismounting of pre-assembled shafts.
Pillow block housings may be used with high-capacity spherical roller bearings or self-aligning ball bearings. They are produced from high-strength cast iron as standard but they are available too in cast steel or spheroidal graphite cast iron. The bearing housings have a re-lubrication facility and may be utilized with either oil or grease lubrication.
Pillow blocks bearings usually are known as the housings that have a bearing installed in them & thus the operator don't need to buy the bearings separately. Pillow block bearings are generally installed in cleaner environments & typically aim at smaller loads of typical industry. These vary from "plummer blocks" that are bearing housings supplied with no bearings & usually are designed for higher load ratings & corrosive industrial environments. Even so the terms pillow-block & plummer-block are utilized interchangeably in some parts of the world.
However fundamental application of both types is the same which is to primarily mount bearings properly allowing their outer ring to become fixed while enabling rotation of the inner ring. The housing is screwed to a foundation from the holes in the base. Bearing housings are generally split type or unsplit type. Split type housings usually are two piece housings in which the cap and base could be unattached. While certain series is one single piece housings. Numerous seals are supplied to avoid dust along with other contaminants from entering the housing. Thus the housing gives a clean environment for the expensive bearings to freely rotate consequently increasing their performance and duty cycle.
Bearing housing is often manufactured from gray cast iron. However many different grades of metals enable you to produce the same.
ISO 113 describes internationally accepted dimensions for plummer block.
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