Abstract: The hydrostatic fluid bearing comprises a cylindrical stator having orifices for introducing a fluid under pressure, on its inside surface the stator has a split ring constituted by an assembly comprising a plane metal plate and a layer of self-lubricating composite material. The layer of composite material has cells for surrounding orifices for introducing fluid under pressure, once the assembly has been put into place inside the stator.

Abstract: An annular fluid film bearing is formed of a stator ring and a rotatable element concentrically mounted within the stator ring such that an annular clearance is defined between the inner surface of the stator ring and the outer surface of the rotatable element. Fluid flows through the annular clearance, and hydrostatic pressure of the fluid in the clearance provides radial support to the rotatable element and stiffness and damping for the bearing. A diffuser and inlet flow guide is mounted adjacent the inlet end of the annular bearing clearance. The diffuser and inlet flow guide comprises a ring having a plurality of flow passages formed in its inner surface facing the rotatable element. The flow passages are configured to turn the fluid approaching the inlet of the annular bearing clearance such that the fluid entering the annular clearance has a tangential velocity opposite to the direction of rotation of the rotatable element.

Abstract: The dynamic pressure bearing device is structured such that the pores of porous material as they are are disposed in the surfaces thereof forming the negative pressure cancel portions 15b and a lubricating fluid is supplied to the negative pressure generating areas thereof through the pores of the negative pressure cancel portions 15b, whereby, even if recess-shaped grooves forming the negative pressure cancel portions 15b are formed shallow in depth and wide in width, or even if such grooves themselves are not formed at all, the dynamic pressure bearing device is able to fulfill its negative pressure cancel function in a sufficient manner. This makes it possible to eliminate the need for provision of the conventional recess-shaped grooves which are formed deep and narrow, thereby eliminating the need to execute an expensive operation such as a cutting operation or the like, so that the negative pressure cancel portions 15b can be formed at a low cost by inexpensive means such as by molding or the like.

Abstract: A bearing for supporting a rotating shaft receiving a transverse load, wherein the bearing supports the shaft along a load line and wherein the bearing is closest to the rotating shaft at a running line. The bearing includes a circumferential inner surface, and a lubricant bay defined in the inner surface. The lubricant bay is axially and circumferentially offset from the load line such that a resulting pressure pad of lubricant within the bay provides a hydrostatic force that forces the running line to a location substantially perpendicular to the load line. Load capabilities of a bearing according to the present disclosure, therefore, are substantially insensitive to shaft bending and do not deteriorate in response to the shaft bending.

Abstract: A fluid flow control system for a bearing supporting rotating equipment, method and apparatus is disclosed in which a rotating shaft is suspended in a fluid. Shaft precession is monitored to provide a compensatory feed back loop to maintain proper shaft registry in the face of loads.

Abstract: The invention relates to a device for movably supporting or mounting a disk, a fluid supply being provided in a holding device so that the disk can be supported movably in the holding device on a fluid film and a return force acting on the object due to the configuration of the supported disk and a recess arranged in the holding device in conjunction with the fluid film when the object is deflected from its resting position, the invention also relating to a method for supporting the object.

Abstract: An orifice compensated hydrostatic bearings wherein a roughened surface area retards the hydrostatic fluid flow exiting the hydrostatic bearing reducing the whirl frequency ratio while increasing the bearing stiffness and life.

Abstract: A hydrodynamic oil film system is disclosed for developing a lubricant film between a flywheel and an associated stationary bearing during press machine operation. Hydrostatic bearing pads formed in the inner bearing surface of the stationary bearing are used to receive pressurized fluid. A hydrodynamic effect is produced during rotation of the flywheel enabling fluid transmitted into the hydrostatic bearing pads to be provided within the clearance between the flywheel and the stationary bearing. In another aspect, an oil film is produced between the keyed sections of the stationary bearing and an adjacent bearing support block to which the stationary bearing is interengaged for anti-rotational purposes, thereby preventing pounding out of the material from the key surfaces.

Abstract: A circumferential flow type dynamic pressure bearing 1 is comprised of a shaft 2 having a multiple-arc-shaped pressure generating surface and a circular sleeve 3 fitted on the shaft 2. The shaft or the sleeve is formed with a plurality of proximity portions 4 each of which is close in distance to the surface opposed thereto whereby the support force of gas is generated. A plurality of grooves 5 formed at locations spaced from each other by an angle obtained by dividing the circumference by the number of proximity portions 4 or a divisor thereof. Use of such bearing ensures compatibility with high-humidity environmental conditions by provision of grooves, and at the same time it is capable of eliminating or reducing noise generated by vibration caused by radial deviations of the shaft due to provision of the grooves.

Abstract: A sleeve bearing structure for holding a shaft rotating in a first direction includes a bearing having an inward wall defining therein a through hole, a bearing stand engaged with the bearing for supporting the bearing and having a cavity which is in communication with the through hole at the bottom thereof below the bearing, and a first set of threads formed in the first direction on a first part of the inward wall.

Abstract: A rotary hybrid bearing that utilizes both hydrostatic and hydrodynamic principles to support a rotatable shaft in which lubricating fluid is fed through orifices or other flow restriction devices to a plurality of recesses, and finally across lands and out of the bearing. The shaft is rotated in such a direction as to pump the fluid back through grooves from lands to recesses, thereby reducing the flow rate of lubricant through the bearing. The recesses are located at an angular position from lands such that a force is generated by hydrostatic action that substantially cancels the destabilizing force generated by hydrodynamic action, thereby greatly enhancing the stability of the bearing and enabling higher rotational speeds.

Abstract: To achieve an efficacy of allowing a shaft to spin in high speed without contacting the bearing in which the shaft is seated, a bearing is configured to comprise an inner ring which includes: at least two slant arc surface zones each spaced out from the surface of the shaft with a gap shrinking, in the spinning direction of the shaft, to a thickness approximately equal to a preset minimum value.

Abstract: A bearing for supporting rotating equipment, a fluid handling system associated therewith, a control system therefore, method and apparatus is disclosed in which a rotating shaft is suspended in a fluid. Shaft precession is monitored to provide a compensatory feed back loop to maintain proper shaft registry in the face of loads.

Abstract: A dynamic-pressure gas bearing structure includes a columnar shaft made of a silicon-nitride-based ceramic sintered body, a hollow cylindrical sleeve opposed to the shaft as keeping a clearance in a radial direction, the sleeve being made of a silicon-nitride-based ceramic sintered body, and at least three flat face portions located on a peripheral surface of the shaft and at equal intervals to the circumference along the peripheral surface. The flat face portion includes a plurality of unit planes continuously formed at predetermined angles to a direction of the circumference on the peripheral surface of the shaft. The unit planes are formed so as to extend substantially in parallel with an axial direction of the shaft.

Abstract: A hydrodynamic radial bearing including a cylindrical body having an inner wall and an outer wall, at least one gutter along the inner wall and at least one wedge-shaped recess in fluid receiving communication with the at last one gutter. The at least one wedge has a wide portion immediately adjacent the gutter and a narrow portion located away from the wide portion along the circumference of the inner wall.The bearing is manufactured by inserting the bearing into a fixture having at least one deforming protuberance located along an interior wall of the fixture so that the at least one protuberance contacts the outer wall of the bearing and elastically deforms the inner wall of the bearing. Then a machining operation is performed along the inner wall to remove the deformed portion of the inner wall. The bearing is then removed from the fixture and the machined portion of the wall retracts, forming at least one recess.

Abstract: A spin index fixture has a housing which is provided with an air inlet shaft for permitting pressurized air to enter the housing and to propagate through grooves disposed along the outer surface of the sleeve. The air then enters into a clearance volume between the housing and the spindle and serves as an air bearing. The spindle is further provided with impelling recesses disposed circumferentially along the outside surface of the spindle at an axial location that is in alignment with the pressurized air inlets. The force of the air against the recesses rotates the spindle about its axis when the pressurized air supply contacts the recesses.

Abstract: A recording disk apparatus comprises a clearance between a shaft and a thrust bearing portion tapered in a circumferential direction, a lubricant communication groove of a bearing covered by the shaft so that a lubricant on a radial bearing portion communicates with the lubricant on the thrust bearing portion through the lubricant communication groove, a lubricant circulating path which extends axially from the thrust bearing portion to the radial bearing portion to prevent the lubricant flowing out of the thrust bearing portion from returning directly to the thrust bearing portion without passing the radial bearing portion, and/or a clearance between a slide bearing and a magnetic fluid seal device substantially filled with a magnetic fluid lubricant.

Abstract: A magnetic disk drive motor includes a hub stand for driving a disk while carrying the disk thereon, a shaft fixed to the middle of the hub stand, a rotor case attached to an end of the shaft and having a drive magnet on an inner side of a circumferential wall thereof, a substantially cylindrical housing rotatably supporting the shaft through a bearing, and a base plate supporting a stator core, wherein an end of the bearing is in slidable contact with the hub stand; and at least a part of the one end surface of the bearing is cut away.

Abstract: Provided is a dynamic pressure gas bearing structure which is applicable to a high-speed rotation driving part such as a hard disk driver or the like and has high rotational accuracy in high-speed rotation. The dynamic pressure gas bearing structure comprises a shaft body and a bearing body. When the shaft body and the bearing body are so arranged that central axes thereof are aligned with each other, a substantially cylindrical gap is defined between the outer peripheral surface of the shaft body and the inner peripheral surface of the bearing body. The gap has at least one gap change portion whose thickness is changed with respect to a central angle corresponding to the circumference along the outer peripheral surface of the shaft body. The gap change rate .alpha. is at least 1.0.times.10.sup.-4 /.degree. and less than 10.0.times.10.sup.-4 /.degree. .

Abstract: An air bearing having a non-circular bearing having a longitudinal bearing axis, and a plain cylindrical horizontal shaft rotatably mounted in the bearing, wherein the bearing surface when developed into a flat plane, has a shallow sinusoidal wave form including at least three wave peaks, one of the peaks having a groove therein, extending longitudinally, parallel to the bearing axis.

Abstract: A shaft bearing or bushing includes a hydrodynamic wedge film lubricant pumping surface along one edge region and an essentially continuous cylindrical land surface along the other opposed edge region. Lubricant moves circumferentially along the pumping surface and axially along the continuous land surface. The bearing provides extensive surface area oil film support for the rotating shaft and may be optimized for supporting a specific shaft load distribution.

Abstract: An improved journal bearing includes a first groove, in the direction of journal rotation, formed in the inner surface of the journal bearing. The first groove extends axially along the length of the bearing and has opposed, open groove ends. A second groove, in the direction of journal rotation, is formed in the inner surface of the journal bearing. The second groove extends axially along the length of the bearing and has opposed, closed ends. An orifice is provided for supplying a lubricant to the inner surface of the journal bearing. The lubricant supply orifice is disposed substantially centrally along the bearing length and intermediate the first and second grooves.

Abstract: A novel means for the design of the pockets of a hydrostatic spindle and the flow supply, collection, and pocket injection means to allow for very high speed rotation with a minimum of heat generation, mid maximum load capacity; furthermore the concept of self compensation is used to make the design insensitive to contaminants and thereby allow for the use of water based hydrostatic fluids, whereas the design of the compensator region is also advanced to facilitate high speed use. Accordingly, the present invention allows designers to increase the allowable speed and accuracy of rotary motion hydrostatic bearings. Design methodologies are presented for designing self compensating hydrostatic bearing spindle pockets and compensators to minimize the effects variation in stiffness with angular position, cavitation in bearing pockets, and turbulent shear power generation.

Abstract: A bearing member for rotatably supporting a rotary shaft has an internal bore which forms a bearing surface. The bearing surface is formed with a plurality of rectangular fluid pockets in a circumferential direction thereof and a land portion around the fluid pockets. A plurality of protrusions extending in an axial direction of the rotary shaft are formed in each fluid pocket to be discontinued from the land portion. Further, a supply port is formed in each fluid pocket for supplying pressurized fluid therewith. Each of the supply ports is positioned at the upstream side in the rotational direction of the rotary shaft.

Abstract: A hydrostatic bearing having two axial grooves on opposite sides of the bearing for breaking the rotational symmetry in the dynamic force coefficients thus reducing the whirl frequency ratio and increasing the damping and stiffness of the hydrostatic bearing.

Abstract: In a dynamic pressure bearing having a sleeve and a shaft fitted in the sleeve, dynamic pressure generating grooves are formed on an outer cylindrical surface of the shaft. The dynamic pressure generating grooves consist of first oblique grooves disposed in a first cylindrical zone of the outer cylindrical surface, second oblique grooves disposed in a second cylindrical zone spaced from the first cylindrical zone in an axial direction, and cross grooves (or generally X-shaped grooves) disposed in an intermediate cylindrical zone between the first and second cylindrical zones. The first oblique grooves are oblique in a direction with respect to a generating line of the cylindrical surface and the second oblique grooves are oblique in a direction opposite to the direction in which the first oblique grooves are oblique.

Abstract: A hydrostatic radial pocket bearing for a servo cylinder is described, particularly for a high performance testing cylinder, of the kind as used, for example, in test rig or simulation technology. The radial pocket bearing is suitable for the highly precise regulation of the piston and for receiving large transverse forces acting on the piston rod. An even number of bearing pockets is uniformly distributed over the bearing periphery and fed from a source of pressure fluid by way of associated preliminary throttles connected to pressure supply conduits and by way of an associated connecting conduit. The preliminary throttles are formed by the bearing gap between a supply orifice and at least one outlet groove in an opposite bearing pocket, the bearing pocket being in the form of a reentrant depression either in the fixed or in the moving bearing portion.

Abstract: A hydrostatic bearing support for a rotor includes a bearing, and a mounting for the bearing affording a clearance space between the rotor and the bearing. A hydrostatic feed pocket is carried by the mounting for receiving a fluid under pressure and supplying the fluid under pressure into the clearance space to provide a fluid film between the bearing and the mounting. A pump supplies fluid under pressure to the pocket. A pressure fluctuation damper is disposed between the pump and the pocket enabling the fluid to provide a bearing support having simultaneously a low dynamic stiffness for damping rotor vibration and a high static stiffness for locating the bearing relative to mounting.

Abstract: A self-compensating rotary hydrostatic bearing and method in which preferably circular annular pressurized-fluid-receiving grooves provided in the opposed housing bearing surfaces regulate the fluid fed to longitudinal recess pockets formed in the opposing bearing surfaces, at an angle to avoid the occurrence of turbulence, to provide a thin film or layer of pressurized fluid in the gaps between a shaft and the opposing bearing surfaces; the regulation establishing differential pressures in the opposing bearing surface pockets to compensate for loads applied to opposite sides of the bearing.

Abstract: A gas supported bearing includes a first stationary bearing element having a longitudinal axis and a first bearing surface. A second rotating bearing element is coaxially aligned with respect to the first bearing element and includes a second bearing surface. A pneumatic load ramp is formed in one of the bearing surfaces to apply an asymmetric load to either bearing element to eliminate bearing whirl instability.

Abstract: A pneumatic shaft assembly of machine tool has a housing, a sleeve lodged securely in the housing, and a shaft received in the sleeve. The sleeve is provided with an annular gas chamber and the two sets of balancing chambers in communication with the annular gas chamber. Each of the balancing chambers has a plurality of circular bores of identical diameter. The housing is furnished with an opening, which communicates with the annular gas chamber and permits the compressed gas to pass therethrough to enter the annular gas chamber, from which the compressed gas is directed to flow to the circular bores of the balancing chambers so that the compressed gas is uniformly distributed via the circular bores to a clearance formed between the shaft and the sleeve so as to reduce the friction between the shaft and the sleeve at such time when the shaft rotates or moves axially in relation to the sleeve.

Abstract: A dynamic pressure bearing device has a bearing and a shaft which is partly accommodated in the bearing. A sliding surface of the bearing is provided with dynamic pressure grooves of circular shape. When the direction of relative movement between the shaft and the bearing is reversed, fluid within the dynamic pressure grooves can move its flowing direction change along the circular dynamic pressure grooves. Further, the dynamic pressure grooves, being of circular shape, can generate dynamic pressures of equal levels irrespective of the direction of the movement.

Abstract: A device for delivering pressurized fluid from a fixed housing to a rotatable shaft includes two hydrostatic bearings in form of circumferentially spaced recesses which are arranged in the housing for supporting the shaft. Extending between the hydrostatic bearings is a ring channel which is in communication with a feed bore in the shaft for supply of hydraulic pressurized fluid. For adaptation of the device to varying operational conditions, capillaries are provided whose effective length and thus throttle effect is adjustable for the pressurized fluid which enters the recesses of the hydrostatic bearings. The fixed housing is comprised of an inner ring and a concentric outer sleeve so that adjoining surfaces are formed therebetween, with the capillaries being provided in one of the adjoining surfaces and intersected by axial grooves. Through modifying the angular position of the sleeve relative to the ring, the throttle effect can be varied in a suitable manner.

Abstract: A pump 10 for materials having a viscosity up to about 3.0.times.10.sup.5 cps, such as cellulose acetate, has a pump body 12 formed with a gear receiving means and, mounted thereon for closing the gear receiving means 13, a pair of side plates 16, 18 having bearing receiving cavities 21. The side plates 16, 18 have pressure relief means 50 for relieving pressure that builds-up in the intermesh of gears 14 when highly viscous material, such as cellulose acetate, is being pumped. This means of diverting the pressure buildup enables the pump 10 and component parts, such as shafts 22, 24 and plain bearings 20, to resist premature failure due otherwise to the resultant load caused by residual pressure buildup. In the preferred embodiment, wear resistant ceramic plain bearings 20 are press fitted in the bearing cavities. Grooves or channels 30 in the interior walls 32 of bearings 20 provide a means to lubricate shafts 22, 24 rotatably supported in the bearings 20.

Abstract: A gas supported bearing includes a first stationary bearing element having a longitudinal axis and a first bearing surface. A second rotating bearing element is coaxially aligned with respect to the first bearing element and includes a second bearing surface. A pneumatic load ramp is formed in one of the bearing surfaces to apply an asymmetric load to either bearing element to eliminate bearing whirl instability.

Abstract: An inertial linear actuator for stabilizing a platform against vibration includes a movable coil having windings which may be energized, supported on an actuator guide for movement. The actuator guide is fixed to the platform and a current is supplied to the movable coil to generate a force for damping sensed vibrations on the platform surface. Permanent magnets parallel to the actuator guide, and a current in the movable coil results in a force being introduced between the movable coil and the stationary actuator guides. A control system on the platform supplies a feedback signal from an accelerometer coupled to the platform to drive electronics. The drive electronics produce a current having the magnitude and direction for creating the actuator force for damping the sensed disturbance.

Abstract: A screw compressor, having a housing with an inlet and an outlet opening in which two or more rotors are rotatably mounted on bearings. The bearings are equipped with helically meshing profiles which operate tightly in conjunction with a closely fitted cylindrical part of the housing. The bearing devices or the rotors consist at least in part of fluid bearings.

Abstract: The fluid-tight coupling is designed for connecting a fixed hydraulic line with a rotary hydraulic line. The fixed line (1) carries on its end an axially movable tubular piston (7) provided with a hemispherical head (8); the rotary line (2) has an offset end portion (15), the axis (Y) of which is eccentric with respect to the axes (X) and (Z) of the pipes (1) and (2), this end portion (15) being also provided with a hemispherical head (16); between the two hemispherical heads (8, 16) is interposed a wobbling rotary core piece (17) formed with a central orifice (18) and with two opposed concave conical bearing surfaces for fluid-tight engagement with both hemispherical heads (8, 16) respectively. In a preferred embodiment, the axial thrust exerted on the hemispherical head (16) corresponding to the rotary pipe (2) is supported by a hydrostatic bearing (24, 25) and the rotary pipe (2) is also supported by a hydrostatic bearing (22).

Abstract: A compressed-air vane motor comprises a rotor which is mounted on anti-friction bearings and has, distributed over the periphery, location slots in which vanes are guided in a radially displaceable manner and whose outer sealing edges bear by centrifugal force against the inner surface of the cylindrical outer shell. To reduce wear and friction, and to achieve a long service life when operating with oil-free compressed air, the outer shell, which is displaced eccentrically relative to the rotor, is rotatably guided in a housing and is driven along by the friction between the vanes and the outer shell, and the cylindrical outer shell is rotatably mounted in the housing by at least one air bearing and to this end is accommodated with little radial clearance in an approximately circular-cylindrical guide bore of the housing. In order to further reduce wear, at least one air pocket is provided and is open toward the outer shell in the housing.

Abstract: A static bearing, more particularly a static gas bearing, with a component to be journalled, which is movable with respect to a fixedly arranged bearing part. The bearing part is provided with one or more openings for the supply of a bearing medium between the bearing surfaces facing each other of the component and of the bearing part. The openings communicate with a supply of a bearing medium. A closure member is resiliently arranged opposite each of the supply openings in such a manner that with increasing pressure of the medium in the bearing gap between the surfaces of the component and the bearing part the closure member is moved away from the relevant supply openings and the flow resistance between the supply and the supply opening decreases.

Abstract: A non-lubricated, gas film load support bearing wherein the rotating shaft is of ceramic material such as silicon nitride, and the surrounding bearing segments are of carbon-graphite material. The carbon-graphite surface is configured with lands and depressions for self-generation of the gas film from surrounding, hot, oxygen-bearing gases.

Abstract: To decrease the wear between the journal 6, and the hydrostatic bearing 1, especially during start up and shut down of the turbomachine, a rub ring 5, is employed intermediate the journal and bearing. The rub ring will come into contact with the journal before the bearing and prevent contact with the bearing bore. The rub ring also serves to block the leakage of the fluid from the bearing. This interrupted flow causes an increase in the stiffness and damping coefficients of the hydrostatic bearing. The use of the rub ring increases the life of the bearing, improves the rotordynamic performance, reduces the leakage flow and improves the hydrodynamic performance of the hydrostatic bearing.

Abstract: A bushing for an oil film bearing assembly has a plurality of hydrostatic oil recesses in its internal bearing surface at the load zone. Each recess is defined by the intersection of a double curved surface of revolution with the bearing surface, the recess thus being in the form of a portion of a prolate spheroid, with a substantially elliptical feathered peripheral edge.

Abstract: A radial load reducing device includes a high-pressure fluid chamber defined to face an outer circumferential portion of a rotating shaft or an outer circumferential portion of a rotating body integrally rotating with the rotating shaft at a first position where a radial load to be applied to the rotating shaft is directed, and a low-pressure fluid chamber defined to face the outer circumferential portion at a second position opposite to the first position. Further, a sliding bearing and a screw compressor using the above device are also provided. The fluid pressure in the high-pressure fluid chamber is applied in a direction counter to the direction of application of the radial load to be applied to the rotating shaft, thereby reducing the radial load to be applied to the rotating shaft.

Abstract: To center optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, the invention includes a device with a housing (10), in which a motor drive (M, R) acts through a torque part (50), drive shafts (14, 14') and drive elements (16, 16') onto aligned centering spindles (18, 18'). These are arranged in guide bearings (22, 22') on projecting parts of the C-shaped housing (10) and are constructed as air bearings. In this manner, it is possible to hold the clamping angle (.alpha.) on the lens (L) in the range below 2.times.8.degree., preferably below 2.times.6.degree.. In particular the lower centering spindle (18) is smoothly axially adjustable in the air bearing (22), for which purpose axially parallel and/or partial-ring-shaped grooves (90) are provided at the ends of a thin-wall guide sleeve (76), between which ends peripheral air-cushion fields build up when pressurized air is being supplied.

Abstract: An oil film bearing for rotatably supporting the journal surface of a rolling mill roll neck on a hydrodynamically maintained oil film. The bearing includes a bushing having outlets adapted to axially interrupt the load carrying continuity of the oil film by draining oil from the load zone at locations intermediate to the ends of the bushing, thereby subdividing the load zone into at least two axially separated pressure zones. Position sensors are located between the pressure zones to monitor the spatial relationship or oil film thickness between the bushing and the journal surface. The journal surface is defined by at least two sleeve segments received on and fixed relative to the roll neck. Adjacent ends of the sleeve segments are aligned radially or in a coplanar relationship with the axial separation between the pressure zones. Temperature sensors monitor the temperature of the oil being drained through the aforesaid outlets.

Abstract: For centering optic lenses in a mechanical mounting, in particular during edge cutting and bevelling, a device with a housing (10) is provided, in which housing a split drive shaft (14, 14') with a torque divider (50) is supported. Two centering spindles (18, 18') are aligned in an axial direction (A) and are in this manner driven by a motor. The ends of the mutually adjacent ends of the centering spindles carry clamping cups (20, 20') between which a lens (L) can be aligned and clamped. An air bearing is provided at least for the lower clamping spindle. The air bearing can be pressure loaded by paraxial and/or graduated-ring-shaped channels (90) with control openings (A, B). In particular, two diametrically opposed air-cushion fields can be loaded with pressure. The clamping spindle (18) can then be smoothly axially moved by a membrane piston (32) permitting thereby a very finely dosable feed movement (FIG. 3).

Abstract: An axially symmetric journal air bearing having areas on the internal surface of the stator, isolates pressurewise from other areas, having selected dimensions and means to apply selected pressures to said areas, wherein said selected dimensions and pressures are selected to maintain equilibrium of the rotor when it is subject to a large radial load.

Abstract: For centering optic lenses in a mechanical mounting, in particular during an edge cutting and bevelling, the invention includes a device having a housing (10), a drive (M, R, 14/14', 16/16') for a lower centering spindle 18 and an upper centering spindle 18' with an interpositioning of a torque divider (50). The centering spindles are held in axial alignment by guiding and clamping bearings (22, 22') and carry clamping cups (20, 20'), between which clamping cups the lens (L), which is to be machined, can be clamped. A clamping device (24) is for this purpose connected parallel to a membrane piston (32), which assures a precise stepped moving of the lower centering spindle 18 in an axial direction (A) to the upper centering spindle (18'). A short-stroke piston (38) exists in each pressure cylinder 28, which short-stroke piston (38) is followed by a long-stroke piston (40) having a bore (42) extending therethrough.

Abstract: A scroll-type hermetic compressor is disclosed including within a hermetically sealed housing a fixed scroll member, an orbiting scroll member, a main bearing frame member, and a crankshaft. The frame member and fixed scroll member define a suction pressure chamber in which the orbiting scroll member is disposed. The crankshaft includes a plate portion disposed between the orbiting scroll member and a thrust surface of the frame. Oil chambers are disposed within respective interfaces between the orbiting scroll member bottom surface and the plate portion top surface, and the plate portion bottom surface and the frame thrust surface. Oil at discharge pressure from an oil sump is supplied to the oil chambers. The oil chambers communicate with one another via a pressure equalization port extending through the plate portion.