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Precision Engineering
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lubricant within the bearing However, rolling element bearings lack in terms of larger space required in the radial direction, finite fatigue life subject to wide fluctuations, low damping capacity, higher noise level, higher cost and more severe alignment requirements The Engineering Science Data Unit (ESDU) provides useful guidance in choosing the most appropriate type of bearing for a given application Figure 623 shows the typical maximum load that can be carried at various speeds, for a nominal life of 10,000 hours at room temperature, by various types of journal bearings on shafts of
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Fig 623: A general guide to journal bearing type Except for rolling element bearings, curves are drawn for
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bearings with a width equal to the diameter A medium-viscosity mineral oil is assumed for hydrodynamic bearings [1]
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Rolling Element, Hydrodynamic and Hydrostatic Bearings
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Fig 624: A general guide to thrust bearing type Except for rolling element bearings, curves are drawn for typical
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ratios of the inside to the outside diameter A medium-viscosity mineral oil is assumed for hydrodynamic bearings [1]
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the diameters quoted The heavy curves indicate the preferred type of journal bearing for a particular load, speed and diameter Similarly, Figure 624 is applicable to thrust bearings
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635 Hydrodynamic Thrust Bearings
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So far, most of the discussion was based on hydrodynamic journal bearing Although the basic principle is very similar, it is beneficial to have an overview of hydrodynamic thrust bearings In
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Precision Engineering
thrust slider bearings, the surfaces are perpendicular to the axis of rotation The thrust slider bearing geometry is shown in Figure 625 There are several types of slider bearings: Two of the more common types are the fixed-inclined slider bearing and pivoted-pad slider bearing Their configurations are shown in Figure 626 and Figure 627, respectively In addition, the pad may take various shapes as shown in Figure 628
Fig 625: Thrust slider bearing geometry [1]
Bearing (1) ro ri Na
Sliding surface or runner
Pivot Pads
Fig 626: Configuration of a multiple fixed-inclined
thrust slider bearing [1]
Fig 627: Configuration of a multiple pivoted-pad thrust
slider bearing [1]
636 Application of Hydrodynamic Bearings
Figure 629 shows the use of bearings as an element in the assembly of a shaft In practice, the use of hydrodynamic and rolling element bearings can be used together for most machine tool applications However, these bearings are not well suited for high end precision applications Therefore, these bearings are seldom found in precision and ultra-precision machines Basically, sliding bearings can be further classified into journal or sleeve bearings and thrust bearings Journal bearings are cylindrical and support radial loads On the other hand, thrust bearings are generally flat, and in the case of a rotating shaft, support loads in the direction of the shaft axis
Rolling Element, Hydrodynamic and Hydrostatic Bearings
Fig 628: Some forms and shapes of convergence clearance [5]
Fig 629: A shaft assembly of bearings supporting a clutch, gear and a pulley
Figure 630 clearly indicates the example of the two types when using a crankshaft supported by two main bearings that are attached to the connecting rod by the connecting rod bearing
Precision Engineering
Fig 630: Crankshaft journal and thrust bearings [13]
In precision machines, hydrostatic sliding bearings are commonly used in slide assemblies An example is the dovetail bearing configuration shown in Figure 631 There are four bearing pads on the top surface, and two are on each of the angled surfaces [9] Other configurations that are possible include a vee-shaped and flat linear bearing and double-vee linear bearing configuration
Fig 631: Construction of a modular dovetail slide assembly [9]
Rolling Element, Hydrodynamic and Hydrostatic Bearings
Hydrodynamic bearings are extensively used in a variety of pumps The standard bearing arrangement for larger pumps utilizes oil-lubricated, white-metal lined bearings with a steel back as shown in Figure 632 On smaller pumps, it is common to use the fluid being pumped as the working lubricant This greatly simplifies the design and part count with a significant impact upon cost Ceramic bearings, normally in the form of silicon carbide, provide an excellent wear resistance for pumps where the lubricant contains significant amounts of abrasives (Figure 633) This particular type of bearing has a life of about 20 years
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