Sliding Bearing

About Sliding Bearing 

Slide bearings, also referred to as sliding or plain, bearings encompass a range of mechanical components that go by various names but are generally grouped as fluid-film bearings, whose purpose is to reduce friction between rotating, reciprocating, or sliding surfaces such as shafts and stationary surfaces such as housings.

Special Situations

The lubricating film is generally oil, although water is sometimes used in special situations, and “dry running” bearings attain their slipperiness by way of PTFE or other low-friction materials. 

Difference

Slide bearings differ from ball and roller bearings which use rolling elements to reduce friction but in both instances, the goal is the same. 

Machine Elements Name

Machine elements go by many names, including sleeve bearings, bushings, journal bearings, sliding bearings, friction bearings, etc. They were in use long before practical ball and roller bearings were developed. 

Classification

Bronze and babbitt bearings

Sintered bronze bearings are made by compressing powdered mixtures of copper/tin or iron/copper into the shape of the bearing and then heating the shape to a temperature between the melting points of the two metals. This produces a porous material that is able to absorb oil and release it under heat and pressure. Theoretically, such bearings are self-lubricating although provisions are usually included for adding grease or oil to the bearing internals. 

Carbon insert bearings

Graphite is used as a shaft lubricant in many instances where the environment is too tough for rolling-element bearings. In the typical design, cast bronze is machined to the dimension of the bearing and holes are bored into the outer surface and through to the interior bearing surface. 

Polymer bearings

Polymer bearings are typically injection molded with solid lubricants or filament wound with lubricating strands and represent the newest approach to slide bearings. PTFE, known for its high slip properties, is often bonded to a thin metal shell to produce a slide bearing that can run dry without cold flow. Heat can diminish the effective range of these bearings; metal shells are sometimes used to dissipate the heat produced during operation. 

Oil impregnated bearings

Bearings with an oil-impregnated porous sintered body composed mainly of metal powder. Oil is impregnated into the pores of the bearing itself, resulting in efficient lubrication within the bearing during operation.

Spherical plain bearings

Self-aligning bearings with sliding spherical surfaces that can support radial loads or axial loads in both directions. Ideal for vibrating or aligning movement, and widely used in construction machinery and industrial machinery.

Sliding bearings are bearings where only sliding friction is generated. The shaft is generally supported by the sliding surface, with oil and air in between to facilitate sliding movement. Sliding bearings are lightweight and have a long operating life while introducing minimal vibrations or noise.

Brass Bushings Self-lubricating Sliding Bearing

Advantages Of Sliding Bearing

  • Easy to install and easy to do maintenance
  • Minimal space requirement
  • Low weight due to compact construction
  • High durability
  • Good resistance to impacts, shocks and vibrations
  • Tolerant to soiling, therefore lower sealing effort required
  • Very well suited for hydrodynamics & high-speed applications
  • Suitable for rotational, oscillating and linear motions applications
  • High corrosion resistant
  • Wide operating temperature range i.e. –200 °C to +280 °C
  • Low friction factor from 0.02 to 0.20
  • Special shapes and special dimensions can be designed on customer demand
  • Minimized wear and excellent service life

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