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Most hydrostatic systems (thrust or journal bearings) use several evenly spaced pads, so that nonsymmetrical load distributions can be handled To estimate the performance, each pad can be treated separately On the other hand, a restrictor can be defined as a hydraulic resistance either fixed or variable between the source of fluid under pressure, and the pocket of a hydrostatic bearing A restrictor plays an important role in providing a finite stiffness for the bearing [17] The design of flow restrictors influences bearing stiffness, pumping power, supply pressure, and lubricant flow A flow restrictor is necessary for providing a pressure drop between the supply manifold and the pad recesses to ensure pressure requirements in any given pad never exceed supply pressure A bearing with restrictors is known as a compensated bearing Hydrostatic bearings are usually supplied from a constant pressure source The restrictor or compensator acts between the supply pressure and the bearing recess to reduce the pressure The most common forms of control device or compensators are the orifice, capillary and variable-flow restrictor The first two are fixed-flow restrictors, while the third is a valve, which automatically adjusts the flow as it senses pressure differentials between pads A capillary restrictor as shown in Figure 642 consists of a long passage in which the resistance to flow primarily depends on the shear stress developed in the fluid as a consequence of its viscosity On the other hand, an orifice restrictor consists of an aperture in a relatively thin wall in which the resistance to flow primarily depends on the direct stress developed in the fluid due to its inertia and density The variable-flow restrictor Fig 640: A glass capillary tubing restrictor [17] provides a stiffer bearing system but is more expensive than fixed-flow restrictors The sizing of the orifice or capillary for optimum performance is an essential part of the design of a compensated hydrostatic bearing The capillary has advantages over the rest because the load and deflection characteristics are made independent of viscosity that is influenced by the temperature The work of Hessey and Manton indicates that it is generally more suitable to use capillary restrictors in bearings subjected to a wide range of operating temperatures, if sufficient stiffness can be obtained [18] Capillary restrictors are also made out of solid copper instead of glass The pressure lifts the rotor until the flow out of the recess and over the land equals the flow in A constant gap is maintained for a given recess pressure and bearing load (Figure 641) The gap establishes the volume of fluid pumped through the bearing An alternative design is to connect a fluid displacement pump (gear or vane type) directly to each pocket without flow restriction The axial grooves in hydrostatic bearings assist in returning the oil and ensure that the pressure in one pocket is not directly influenced by the flow of fluid in an adjacent pocket (Figure 642) However, unless precautions are taken to ensure that the grooves are full of oil, at times, there is a risk that, at high speeds, air might be dragged into the pockets, causing a loss of stiffness.

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In a constant supply pressure system (Figure 643), the flow, the pocket pressure and the land clearance are all interdependent, and the pad adopts an equilibrium position above the slideway at which the flow is such that it produces the pressure conditions necessary to balance the load In a constant flow system, the only difference is that there is no inflow restrictor [17]

Fig 642: The axial grooves in hydrostatic bearings [17]

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Rolling Element, Hydrodynamic and Hydrostatic Bearings The hydrostatic bearing design requires the adjustment of a number of parameters, including the pad geometry, restrictor size, supply pressure and journal bearing clearance to optimize performance Among the factors that play a major role in determining the design and the types of the hydrostatic bearings are Speed of sliding low, medium or high Shape of the sliding surfaces in particular, whether the gap between the pad and the slideway is of a uniform thickness Variation in the sliding speed over the surface of the pad Viscosity and the viscositytemperature characteristics of the supporting fluid used

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