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BEARINGS
By Meherwan P. Boyce
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From Centrifugal Compressors: A Basic Guide
BEARINGSThe bearings in turbomachines provide support and positioning for the rotating components. Radial support is generally provided by journal or roller bearings, and axial positioning is provided by thrust bearings. Some engines, mainly aircraft jet engines, use ball or roller bearings for radial support, but nearly all-industrial turbomachinery use journal bearings. A long service life, a high degree of reliability, and economic efficiency are the chief aims when designing bearing arrangements. To reach these criteria, design engineers examine all the influencing factors:
JOURNAL BEARINGSThe heavy frame type gas turbines use journal bearings. Journal bearings may be either full round or split; the lining may be heavy, as in large-size bearings for heavy machinery, or thin, as used in precision insert-type bearings in internal combustion engines. Most sleeve bearings are of the split type for convenience in servicing and replacement. Often in split bearings, where the load is entirely downward, the top half of the bearing acts only as a cover to protect the bearing and to hold the oil fittings. Figure 11-20 shows a number of different types of journal bearings. A description of a few of the pertinent types of journal bearings follows:
Copyright Penn Well Corporation 2003 under license agreement with Books24x7
Products & Services
Hydrostatic bearings and hydrodynamic bearings are fluid film bearings that rely on a film of oil or air to create a clearance between the moving and stationary elements.
Learn more about Hydrostatic and Hydrodynamic Bearings
Flange mounted bearings are used when a shaft axis is perpendicular to the bearing mounting surface. They are available in 2, 3, or 4-hole configurations.
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Learn more about Flange Mounted Bearings
Babbitt bearings are rotary bearings (no rolling elements) with special alloys poured into place in the bearing housing.
Learn more about Babbitt Bearings
Bearing rings, housings and flanges are bearing components that are used in the assembly of many different types of bearings. Bearing rings, which are sometimes referred to as bearing races, guide a rolling element such as a ball, roller, or needle roller. Bearing housings and flanges hold an insert bearing in position, support the load transferred from the bearing shaft through the bearing, and are used to mount the bearing to a surface.
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Learn more about Bearing Rings, Housings and Flanges
Linear bearings are used in applications where a component needs to be moved along a straight line with high accuracy.
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Learn more about Linear Bearings
Product Announcements
Topics of Interest
FACTORS AFFECTING THRUST BEARING DESIGN
The principal function of a thrust bearing is to resist the thrust unbalance developed within the working elements of a turbomachine and to maintain the rotor...
(Read More)
Chapter List
Chapter 13: Bearings and Seals
Chapter 14: Gears
Bearings
The bearings in gas and steam turbines provide support and positioning for the rotating components. Radial...
(Read More)
A pump bearing system consists of bearings to carry radial loads and at least one bearing
to carry axial or thrust loads. For horizontally mounted pumps, there are two basic pump
rotor arrangements:...
(Read More)
BEARINGS AND LUBRICATION
Very large horsepower (kilowatt) motors are generally supplied with oil-lubricated sleeve bearings with oil supplied from a reservoir. In some cases, pressurized oil...
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Arrangements Each pump shaft is supported by two radial bearings and a thrust bearing;
the thrust bearing is normally a double acting thrust and radial bearing. For pumps
with externally...
(Read More)
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