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356 Table 79
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Precision Engineering A comparison of bearing types Power requirement [32]
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Bearing type
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at 3000 rev/min Friction Total 0101 0007 0480 0400
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at 20000 rev/min Friction 0045 0164
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Total 0145 0164
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Aerostatic Ball bearing Hydrodynamic Hydrostatic
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0001 0007 0480 0200
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Due to the rubbing contact that occurs for all rolling contact bearings, the bearings are subjected to wear and have a definite life even if they are operated under ideal conditions The shaft comes into contact with hydrodynamic bearings when starting and stopping This wear is minimal due to the boundary lubrication that is present In ideal conditions, the aerostatic bearings are not subjected to wear because there is absolutely no contact between the surfaces However, during operation, it is crucial to ensure that the bearings are not overloaded, and the gas supply is properly filtered Precautions in the event of a gas supply failure must be taken to avoid a disastrous touch down Hamrock [9] has summarized the parameters that were discussed previously for various types of journal bearings in Table 710 In addition technical parameters such as the load capacity and the stiffness that are discussed in detail previously, other parameters related to operating conditions are also crucial in determining the choice of the bearing Table 710 serves as a good guide for maintenance of the bearing system
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76 MATERIAL SELECTION
BEARINGS
The materials of the bearing also influence the performance of the system that utilizes aerostatic bearings According to Slocum [1], the main properties that are desirable to be considered in selecting aerostatic bearings material are as follows: Corrosion resistance Materials whose electrochemical potential varies by more than 025 V are not recommended Thermal expansion It is wise to match thermal expansion rates as far as is practical If precise machining is not possible, it is necessary to investigate the consequences and to adjust clearances if necessary Aerostatic bearing bush materials Bronzes are highly recommended Lead bronze is corrosion resistant and has good anti-seizure properties These materials can be easily rectified when damaged and may be used as relatively thin shells shrunk fitted into body bores
Table 710
Condition
Advantages and limitations of journal bearings [9, 38]
General comments Journal bearing type Rubbing bearings Oilimpregnated porous metal bearings Rollingelement bearings Hydrodynamic Hydrostatic Self-acting Externally fluid film fluid film gas bearings pressurized bearings bearings gas bearings
Attention to differential expansion and High their effect on temperature fits and clearances necessary
Normally satisfactory depending on material
Attention to oxidation resistance of lubricant is necessary
Up to 100 C no limitations; from 100 to 250 C stabilized Attention to oxidation resistance bearings and of lubricant is necessary special lubrication procedures are probably required For below 30 C special lubricants are required; consideration of starting torque necessary May impose limitation; consult manufacturer Lubricant may impose Lubricant may limitations; consideration impose limitations of starting torque necessary
Excellent
Excellent
Attention to differential Low expansion and temperature starting torques is necessary Attention to possibility of fretting damage is necessary (except for hydrostatic bearings)
Lubricant may impose limitations; consideration of starting torque necessary
Gas Lubricated Bearings
Excellent; through drying of gas is necessary
External vibration
Normally satisfactory except when peak of impact load exceeds load-carrying capacity
Satisfactory
Excellent
Normally satisfactory
Excellent
(Contd)
Table 710 (Contd)
Condition General comments Journal bearing type Rubbing bearings Oilimpregnated porous metal bearings Rollingelement bearings Hydrodynamic Hydrostatic Self-acting gas Externally pressurized fluid film fluid film bearings gas bearings bearings bearings Small radial extent, but total space requirement depends on the gas feed system
358 Precision Engineering
Space requirements
Small radial extent
Bearings of many different Small radial extent but total space requirement depends on Small radial proportions; extent the lubrication feed system small axial extent
Dirt or dust
Normally satisfactory; sealing is advantageous Excellent
Sealing is important
Satisfactory; filtration of lubricant is important
Sealing important Not normally applicable
Satisfactory Not applicable when vacuum has to be maintained
Vacuum
Lubricant may impose limitations Self-contained assemblies can be used with Excellent with certain limits of Auxiliary high self-contained pressure is load, speed, grease or oil and diameter; necessary lubricant beyond this, oil circulation is necessary Excellent Good
Simplicity of lubrication
Excellent
Excellent
Pressurized supply of dry, clean gas is necessary
Availability of standard parts
Good to excellent depending on type
Not available
(Contd )
Table 710 (Contd)
Condition General comments Journal bearing type Rubbing bearings Oilimpregnated porous metal bearings Rollingelement bearings Externally Hydrodynamic Hydrostatic Self-acting fluid film fluid film gas bearings pressurized gas bearings bearings bearings
Prevention of contamination product and surroundings
Improved performance can be obtained by allowing a process liquid to lubricate and cool the bearing, but wear debris may impose limitations
Normally satisfactory, but attention to sealing is necessary, except where a process liquid can be used as a lubricant
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