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Rolling Element, Hydrodynamic and Hydrostatic Bearings
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631 Construction of Lubricated Sliding Bearings
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In general, sliding bearings are easier to construct, but they tend to be more complex in theory and operation By referring to Figure 617, the rotating shaft is known as the journal, whereas the outer support portion is referred to as the sleeve The sleeve is usually lined with brass, bronze or Babbitt metal to reduce wear [2] Figure 620 clearly illustrates the meaning of a journal diameter, bearing diameter and the bearing clearance The sleeve is lubricated with various types of lubricants, including liquid lubricants such as water, oil or even air and solid lubricants such as graphite and molybdenum disulphide The lubricant can also be fed under an external pressure, and these types of bearings are known as hydrostatic and aerostatic bearings and are discussed later
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Fig 617: A sliding journal bearing [1]
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632 Principle of Lubrication
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It is clear that lubrication is closely related to sliding bearings It is beneficial to have a rough idea of the properties of lubricants and the types of lubrication that are possible A lubricant is crucial in a sliding bearing as it serves as an interposed substance that reduces friction and wear Lubricants are usually liquid (oils and greases) but can be solid such as graphite, Tetrafluoroethylene (TFE) or molybdenum disulfide or a gas such as air or a fluid under pressure Solid lubrication is used to replace conventional lubricants that are unable to perform at high temperatures of 300 450 C Oil and grease can be easily recognized Oils are liquid lubricants that are characterized by their viscosity and other properties Greases are liquid lubricants that have been thickened to provide properties not possessed by liquid lubricants alone Greases are generally used where the lubricant is required to stay in position, Fig 618: Bearing geometry
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particularly when frequent lubrication is difficult or is costly Greases also serve to prevent harmful contaminants from entering between the bearing surfaces Lubrication is commonly classified according to the degree to which the lubricant separates the sliding surfaces as indicated in Figure 619 In hydrodynamic lubrication or full-film lubrication, the surfaces are totally separated by the lubricant film The load applied to both surfaces is supported entirely by the fluid film pressure generated by the relative motion of the surfaces Surface wear does not occur, and friction losses originate only within the lubricant film Typically, the clearance or minimum lubricant thickness, ho, is between 0008 mm and 002 mm while typical values of the coefficient of friction are between 0005 and 0001 [14]
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(a) Hydrodynamic (surface separated)
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(b) Mixed film (intermittent local contact)
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(c) Boundary (continuous and extensive local contact)
Fig 619: Three basic types of lubrication [13]
In mixed film lubrication, the surface peaks are intermittently in contact, and there is partial hydrodynamic support Surface wear is mild, and the coefficient of friction commonly ranges between 0004 and 010 Mixed film lubrication is an intermediate sort of transition between boundary and full-film lubrication Boundary lubrication is characterized by surfaces peaks which are extensively and continuously in contact with one another The lubricant is continuously smeared over the surfaces and provides a continuously renewed adsorbed surface film that reduces friction and wear The friction coefficient ranges between 005 and 020 The performance of the bearings differs radically depending on the type of lubrication There is a marked decrease in the coefficient of friction when the operation changes from boundary to full-film lubrication Wear also decreases with full-film lubrication In the application of sliding bearings, a complete surface separation is desirable, which can be obtained through hydrodynamic lubrication The hydrodynamic bearing may also take the form of squeeze film bearings In journal and thrust sliding bearings, pressure is generated due to the wedging action between the surfaces In squeeze film bearing, pressure is developed between two surfaces moving towards each other As the bearing surfaces move towards each other, the viscous fluid exhibits a great reluctance to be squeezed outside the bearing The load-carrying capacity is generated by the action of the fluid that cannot be instantaneously squeezed out The higher the viscosity, the higher is the resistance A pressure is
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