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Figure 622 illustrates the general form of the pressure distribution within a full-film hydrodynamic sliding journal bearing In Figure 622 (a), the pressure rises as the rotating shaft draws oil into the converging wedge approaching the point of minimum film thickness where the maximum pressure occurs After this point, the pressure decreases as the space between the bearing and the journal diverges Figure 622 (b) shows the pressure distribution axially along the shaft through the line of minimum film thickness or maximum pressure The pressure is maximum at the centre of the length of the bearing and decreases as one moves towards the end of the bearing where the pressure is equal to the ambient pressure This is because the lubricant film is exposed to the environment and leakage occurs A continuous supply of the lubricant is important to ensure an adequate supply to create the pressurized film for supporting the applied load
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Fig 622: Pressure distribution in the oil film for hydrodynamic lubrication [14]
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634 Comparison and Selection Between Rolling and Sliding Bearings
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Now that the principle of operation of both sliding and rolling bearings is clear, it is a good idea to have some sort of comparison between the two which will provide designers with guidelines for the selection of bearings This comparison is presented in Table 67 Generally, each type of bearing has its own advantages depending on the application Certain criteria that are useful when choosing a bearing type are load magnitude and direction, space available, limiting speeds, type of lubrication, environment, rigidity, angular misalignment and economic cost Rolling element bearings are more desirable in terms of their low starting and good operating friction, the ability to support combined radial and thrust loads, less sensitivity to interruptions in lubrication, no self-excited instabilities, good low-temperature starting and the ability to seal the
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242 Table 67
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Precision Engineering Selection of bearing types [6]
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Characteristics Unidirectional Cyclic Starting Unbalance Shock Emergency Operational speed Load Sliding Good Good Poor Good Fair Fair Are well suited for high rotating speeds with impact and momentary overloads, the higher the rotating speed, the more effective is the hydrodynamic pumping action Turbulence Temperature rise Fair Rolling Excellent Excellent Excellent Excellent Excellent Fair Rapid accumulations for fatigue cycles and high centrifugal force
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Service factors Mechanical Requirements
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Speed limited by Misalignment tolerance
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Starting friction
Space Radial requirements dimension (Radial Axial bearing) dimension Type of failure
Centrifugal loading Dynamic effects Poor in all ball bearings except where designed for at sacrifice of load capacity Good in spherical roller bearings Poor in cylindrical bearings Low friction can be achieved Low starting friction, so only with full-film lubrication low resistance at start up which cannot be achieved and hence low heat during start up This requires generation at the same hydrostatic lubrication which operating conditions needs a costly external system Small Large 1 1 /4 to two times the shaft /5 to 1 2 the shaft / diameter diameter Often permits limited emergency operation after failure Good Oil or other fluid, grease, dry lubricants, air or gas Limited operation may continue after fatigue failure but not after lubricant failure Poor Oil or grease (Contd)
Damping Type of lubricant
Rolling Element, Hydrodynamic and Hydrostatic Bearings Table 67 (Contd)
Service factors Characteristics Lubrication, quantity required Noise Sliding Large, except in low-speed boundary-lubrication types Quiet Do not normally generate noise and may dampen noise from other sources Rolling
Power consumption
Varies as
N 2D 3L C
Environmental conditions
Low temperature starting High temperature operation Ability to operate in vacuum Life
Poor Limited by lubricant Not suitable Unlimited except for cyclic loading Clean lubricant required
Economics
Maintenance
Cost
Standard
Very small in massproduction quantities or simple types Needs to be designed
Ease of Assembly
Simple installation and assembly Function of design and installation
Ease of replacement
Very small, except where large amounts of heat must be removed May be noisy, depending upon quality of bearing, resonance of mounting and inaccuracies Noise is generated and transmitted to the other parts Varies widely depending upon the type of lubrication Varies directly as speed Usually lower than slider bearings Good Limited by lubricant Ability to operate in high vacuum Limited by fatigue properties of bearing metal Clean lubricant required, occasional attention for grease Intermediate but standardized, varying little with quantity Extensive standardization and large available types with a higher accuracy in calculation of the allowable stresses and service life Complicated because of their high sensitivity to installation inaccuracies Function of type of installation Usually, shaft need not be replaced Simple replacement of damaged parts
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