vb.net barcode reader code Classification of Hydrostatic Bearings in Software

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643 Classification of Hydrostatic Bearings
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Although it would be possible to discuss the properties and design of hydrostatic bearings in terms of the types and factors influencing the approach, real applications seem to have limited options Only a limited number of configurations and conditions are of interest, and it is usually more convenient to adopt a different classification Industrial classifications of bearings include plane slide way bearings, opposed-pad slideway bearings, inclined-pad slideway bearings, journal bearings, rotary thrust bearings and conical journal or thrust bearings as shown in Figure 644 [9] Some of the arrangements such as opposed pad and non-opposed pad are indicated in Figure 647 In non-opposed pads, gravity plays a major role This type of arrangement ensures that the hydrostatic bearings remain loaded at all times In order to support the combination of a journal and a thrust load, there is a single class of hydrostatic bearing consisting of the Yates bearing, conical and spherical bearings The principle behind the Yates bearing is to supply the thrust faces solely by the leakage flow from journal bearings The Yates bearing is characterized by a lower pumping power and a lower friction in the thrust end as compared to separate journal and thrust hydrostatic bearings [19] The geometry of the Yates bearing is shown in Figure 646 (a)
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Fig 644: Types of hydrostatic bearings [9]
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By replacing separate journal and thrust hydrostatic bearings with a conical bearing, the flow rate is more economical Furthermore, there is less power required, and the number of parts is also reduced The clearance of the hydrostatic conical bearing and the aerostatic type is easier to be adjusted In practice, five or six recesses are used for a higher load capacity and stiffness [19] Various
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Rolling Element, Hydrodynamic and Hydrostatic Bearings
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Fig 645: Various hydrostatic bearing designs: (a) opposed pad, (b) non-opposed pad and (c) an example of a
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hydrostatic guideway using three rectangular bars [19]
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configurations may be employed for different applications The geometry of a conical hydrostatic bearing is shown in Figure 646 (b) Spherical bearings (Figure 646 (c)) are well suited for application in self-aligning applications The radial load capacity of a spherical bearing is sacrificed to obtain the freedom of movement along multiple axes It is also more difficult to machine a spherical surface, which leads to higher prices Therefore, such bearings are only used only when necessary
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Fig 646: The geometry of a (a) Yates bearing, (b) Conical bearing and a (c) Spherical bearing [19]
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644 Operation of a Hydrostatic Bearing System
Figure 647 (a) shows the complete arrangement of a hydrostatic bearing system [14], whereas Figure 648 illustrates a hydraulic circuit [19] The system begins from the reservoir, where the displacement pump draws oil from the reservoir and delivers it (oil under pressure) to a supply manifold through
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the bearing pads The oil passes through each bearing pad and a control element that permits the balancing of the system Flow control valves or restrictors at a small diameter of the tubing or orifices offer a resistance to the flow of oil and permit the several bearing pads to operate sufficiently at a constant high pressure to lift the load on the pads After that the oil enters a recess within the bearing pad Figure 647 (b) shows a circular pad with a circular recess in the centre supplied with oil through a centre hole
Fig 647: The main elements of a hydrostatic bearing system with circular pads [14]
Pressure, Ps Restrictor Land
Pressure, Ps /2 Guide rail Sump Restrictors
Fig 648: A hydraulic circuit for hydrostatic bearings [19]
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The load initially rests on the land area The pressure in the recess reaches the level where the product of the pressure times the recess area equals the applied load Therefore, the flow of oil across the land area lifts the load, and the pressure subsequently decreases to atmospheric pressure In order to maintain the oil flow, the system must work satisfactorily, and a sufficient amount of power is required When equilibrium occurs, the integrated product of the local pressure times the area lifts the load by a certain distance, h, which is around 0025 025 mm The film thickness, h, must be thick enough to ensure that there is no solid contact over the range of operation
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