Showing papers on "Fluid bearing published in 1978"

Modular compliant hydrodynamic bearing with overlapping bearing sheet

Abstract: A resilient, compliant, hydrodynamic fluid film bearing, for positioning between a stationary member and the bearing surface of a rotor, includes a bearing module formed as a unitary one-piece article having a resilient support section and a bearing surface section which overlaps its own resilient support section, or that of the next adjacent module, to provide a low cost bearing which is easy, fast and economical to manufacture and assemble.

Staged bearing surface compliance for hydrodynamic fluid bearing

Abstract: A hydrodynamic fluid bearing includes a pivoted shoe which can tilt in response to the hydrodynamic fluid forces generated between the bearing surfaces, and a locally conformable bearing layer attached to the shoe facing the opposing bearing surface. The pivoted shoe can pivot to conform to changes in the pitch of the opposing bearing surface and can tilt to the correct slope to generate the hydrodynamic supporting fluid wedge, and can also conform to the shape of the opposing bearing surface if it becomes thermally distorted or "dished". The compliant layer at the top surface of the shoe can conform to smaller area bearing irregularities, and in addition, can locally conform under hydrodynamic forces to assume the ideal configuration to generate the optimum hydrodynamic wedge. The support on which the pivoted shoe is mounted can itself be pivoted on a gimbal ring to provide large area compliance with the bearing surface to follow, if necessary, precession or other large scale runout of the bearing surface. Each stage of the compliant support can be designed to give the stiffness and damping best suited for that stage of support.

Magnetic disc stores

Abstract: Drive and support structure for magnetic disc stores comprising a drive spindle which is adapted for direct connection to a disc pack, a pair of self-acting air bearings which support the spindle with its axis vertical, and an alternating current synchronous motor comprising a rotor which is connected to the spindle between the bearings and carries permanent magnets, and a stator which surrounds the rotor and produces a rotating magnetic field which interacts with magnetic poles provided at the periphery of the stator by the magnets. The air bearings are each of the inward pumping zero flow herringbone type.The upper end of the spindle is adapted for connection to a disc pack, and the weight of the spindle is supported at its lower end through a self-acting fluid thrust bearing of the grooved hydro-dynamic oil type. A cooling chamber is provided around the thrust bearing to cool recirculated oil.

Hydrodynamic bearing with radial, thrust and moment load capacity

Abstract: A hydrodynamic bearing capable of transmitting radial, thrust and moment loads between an inner load applying or supporting member rotatably connected to the bearing utilizes at least a pair of cylindrical groups of bearing pads disposed about a longitudinal axis of rotation, the pads having movable face portions with compound curved bearing surfaces symmetrically disposed about and along the longitudinal axis, the curved surfaces mating with similar curved bearing surfaces on a load applying or supporting member. The face portions of the bearing pads are supported so that they are swingable about "swing points" located between the axis of rotation of the bearing and the face portions thereof under the combined influences of friction and load forces exerted thereagainst by the load applying or supporting member, so that through hydrodynamic action wedge-shaped lubricant films are generated between the relatively moving bearing surfaces to maintain the surfaces apart while the motion is occurring. Radial, and thrust and moment loads between the load applying or supporting member and the bearing pads are all effectively transmitted by the bearing by reason of the particular relationship between the bearing surfaces, without adversely affecting the hydrodynamic action of the bearing.

Hydrodynamic Lubrication of Ball-Bearing Cage Pockets

Abstract: This paper reports a theoretical study of the hydrodynamic load capacity and friction between a ball-bearing ball element and its straight-sided annular pocket. Design curves are derived which enable forecasts of load capacity, stiffness, torque and power absorbed to be made. The theory is confirmed by appropriate experiments and is also compared with previously published results obtained elsewhere by indirect means.

Compliant hydrodynamic fluid bearing with resilient support matrix

Abstract: A resilient support for a compliant hydrodynamic fluid bearing includes a series of corrugated spring metal strips arranged side-by-side. The corrugations on adjacent strips are displaced axially a distance equal to one-half of the wave lengths of the corrugations so that the peaks on one strip are laterally aligned with the valleys on adjacent strips. This arrangement provides a uniform matrix of support zones for the bearing sheet to minimize localized deflections of the bearing sheet. It produces a bearing sheet profile under hydrodynamic loading which is approximately cylindrical so the supporting hydrodynamic fluid film is more uniform for the generation of greater pressures over a greater area.

Air-platen bearing

Abstract: A fluid bearing platen for a film gate structure contains a pair of cavities to which pressurized fluid, such as air, to be applied against the opposing surfaces of a photographic film, is supplied. Between each respective cavity and one side of the film there is disposed a thermodynamically non-throttling material, such as porous stainless steel, through which the pressurized fluid from the cavities passes, to be directed against the opposite sides of the film. The non-throttling material effectively creates an adiabatic transfer from the cavities to the film's opposing surfaces, thereby eliminating temperature loss and avoiding the wrinkling or warpage of the film.

Fluid bearing supporting system for rotary drums and the like

Abstract: A large diameter rotary drum is horizontally supported upon a plurality of saddle like expansible liquid bearing pads of large effective contact area with the drum, and a fixed saddle adjacent each bearing saddle supports the drum when not floated upon the bearings. The bearings and the lower portion of the drum resting thereon are submerged in the liquid in a sump which is kept at a given temperature by passing the liquid therefrom to a cooling tower or through a heat exchanger. Separate adjustable values supply the activating liquid to each bearing pad and a separate pressure gage is provided between each valve and its associated pad.

Gear type hydraulic pump or motor - has axial ends of gears slanted to produce hydrodynamic lubrication of end face

Abstract: The machine has two gears (12) meshing within a casing. The bearings for the shafts are in bushes between the gears and the endplates of the casing. The bushes are pressed against the end faces of the gears to provide correct axial location. The end face of each gear is cut at a slant so that a wedge-shaped gap (S) is formed between the end of the gear and the face of the bush. The wedge shape widens in the direction of rotation of the gear. This results in hydrodynamic lubrication of the axial end of the gear with reduced friction and wear.

Compliant hydrodynamic fluid bearing with circumferential pre-loading

Abstract: A compliant hydrodynamic fluid journal bearing includes a bearing sleeve having a cylindrical bore which receives a bearing sheet having a radially inwardly facing bearing surface. The bearing sheet is supported by a compliant support element having spaced resilient projections for resiliently supporting the bearing sheet. One end of the support element is welded adjacent to one end of the bearing sheet with an intervening spacer block, and the assembly is fixed in the bearing sleeve. A second block is welded adjacent to the other end of the bearing sheet so that the ends of the bearing sheet extend slightly beyond the blocks. A spring is disposed between the two blocks and is retained in place by the bearing sheet overhangs. The spring exerts a circumferential spreading force on the two blocks and through them on the two ends of the bearing sheet. This spreading force holds down the ends of the bearing sheet for two-way shaft rotation, and has the effect of seating the bearing sheet firmly against the support element, and the support element firmly against the bearing sleeve for bearing clearance control and optimized damping.

Hydrodynamic bearing having anticavitation recesses

Abstract: A hydrodynamic bearing constructed for withstanding varying radial loads has first and second bearing halves arranged on a central axis and encircling a shaft member, each half having an inner bearing face, first and second ends, and first and second sides. A slot of specific construction is formed in the bearing face of at least one of the bearing halves providing a fluid trap for reducing cavitation erosion during use.

Foil bearings for axial and radial support of high speed rotors: Design, development, and determination of operating characteristics

Abstract: Flexible surface thrust and journal foil bearings were fabricated, and their performance was demonstrated, both individually and jointly as a unified rotor support system. Experimental results are documented with graphs and oscilloscopic data of trajectories, waveforms, and scans of amplitude response. At speeds of 40,000 to 45,000 rpm and a mean clearance of the order of 15 to 20 micrometers (600 to 800 micrometers, the resilient, air lubricated, spiral groove thrust bearings support a load of 127 N (29 lb; 13 kgf), equivalent to 3.0 N/sq cm (4.5 lb/sq in 0.31 kgf sq cm). Journal bearings with polygonal sections provided stable and highly damped supports at speeds up to 50,000 rpm.

Fluid bearing equipment

Abstract: PURPOSE:For fluid bearing having high rigidity which may support the shaft to stabilize for vibrating load, separating the bearing surface into plural pressure producing areas on the circumference, by means of forming respective area to static pressure producing area and dynamic pressure producing area.