A plain bearing Plastic bearingis
a simple mechanism consisting of two sliding components。 This lightweight, compact and inexpensive
bearing is widely used in many types of equipment and is sometimes referred to
as a Babbitt, bushing, or
journal bearing。 A plain bearing can be used for three
basic types of motion: linear, thrust, and journal。 The basic types of plain
bearings are bushing, integral or two-piece。 The bearings may be composed of many types of materials。
Plain bearings used for linear motion may consist of either a round
bearing and
shaft assembly or two corresponding surfaces that slide against each
other。 Thrust motion plain bearings allow rotation to take place between
two parts while supporting an axial load。 Journal
motion bearings typically consist of a rotating shaft inside of a
stationary
bearing。 A journal motion is the most common type of
motion in which a plain bearing is utilized。
A bushing type bearing is a separate piece that is fitted inside of a housing
to provide a replaceable bearing surface。 Bushings are
generally the most common type of plain bearing application。 An integral bearing is actually built into the piece of equipment
for which it is being used。 Integral bearings typically
consist of a machined hole bored directly into the piece of equipment with a
steel shaft running through it。 Two-piece bearings are
commonly utilized for large diameter applications such as crankshaft and
connecting rod assemblies。
must be constructed of a durable material that provides low friction and is
resistant to both heat and corrosionslide
bearing。 Plain bearings are typically
composed of two separate components。 One bearing
component is usually made of a soft material while the other is much harder。 In most applications, the soft bearing
component is used to support the harder one。 A wide
variety of materials are used to make the components of plain bearings。
Bronze is typically used in bushing type bearings in combination with a
polished and hardened steel shaft。 The softer bronze
bushing supports the shaft and can be easily replaced when it becomes
worn。 A graphite and copper alloy is typically utilized for plain
bearing
applications in ovens and dryers。 The graphite material
in the alloy acts as a dry lubricant for the bearing。
Cast iron generally provides a long-lasting material in combination with
steel
shafts in thrust motion bearing applications。
Babbitt metal is frequently used as a bore coating for integral type
bearings
to collect lubricant contaminants and prevent damage to the journal。
Solid plastic typically provides a durable bearing material that
requires no lubricant。 Plastic polymer materials are
also resistant to corrosion and generally maintenance free。 The hard
ceramic material used in some plain bearings is usually
able to grind sand and grit contaminants to a fine powder while
providing
continuously smooth operation。
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