Showing papers on "Fluid bearing published in 1968"

Hybrid boost bearing assembly

Abstract: A hybrid boost bearing assembly is described for a rotating shaft member which is rotatably supported on a base member. The hybrid boost bearing assembly comprises a rolling element bearing for rotatably supporting the shaft member on the base member during starts, stops, reverse thrust loadings and under emergency operating conditions, and a fluid film bearing acting singly or coacting with the rolling element bearing for absorbing the loads imposed on the shaft member during all other conditions of operation. A fluid lubricant supply is provided for supplying fluid lubricant to the bearings and means are provided for shifting the loading of the rotating shaft member from the rolling element bearing to the fluid film bearing as the rotating shaft member is brought up to its normal operating speed. The means for shifting the loading from the rolling element bearing to the fluid film bearing comprises the generation of pressure in the fluid film space between the opposed fluid film bearing surfaces, by hydrodynamic action, from an external source of pressure, or by some other means, thereby causing the fluid film bearing to assume a greater share of the load of the rotating shaft as it is brought up to normal operating speed. As a result, the rolling element bearing will assume substantially the full load of the rotating shaft only during starting, stopping, reverse loading periods, and in the event of the failure of the fluid lubricant supply, while the fluid film bearing will absorb the shaft loads under all other conditions of operation. The fluid film bearing may comprise a hydrodynamic bearing for producing a self-acting fluid film, a hydrostatic bearing, or a hybrid hydrodynamic-hydrostatic bearing, and the rolling element bearing may comprise a ball bearing, roller bearing, needle bearing, or the like. In certain arrangements a preloading spring is provided for preloading the rolling element bearing a predetermined amount so that the rolling element bearing assumes a predetermined proportionate share of the loading on the rotating shaft under certain operating conditions. In other arrangements, a retractable bearing piston portion which moves towards and retracts from an opposed, load-sustaining bearing surface is employed to cause the fluid film bearing to assume the load from the rolling element bearing. In other arrangements, a spherically-shaped self-aligning seat is provided which coacts with a complementary-shaped seating surface to accommodate misalignment in the rotating shaft supported by the bearing assembly.

Lens alignment using gas bearings

Abstract: Disclosed is a device for aligning a lens element on an axis through the center of curvature of the major lens surfaces. The device is characterized in that spherical fluid bearings are used to position the lens so that it can be clamped for rotation about its geometrical axis.

Rayleigh Step Journal Bearing, Part II—Incompressible Fluid

Abstract: Rayleigh step journal bearings, considering pressure distribution, load capacity and attitude angle and optimal film thickness ratio for incompressible fluid lubrication

Sawing machine and system

Abstract: A cyclic saw having a thin, flexible, broad band blade, of tapered thickness, guided by fluid bearings coacting with the side faces of the band blade.

Fluid bearing roll with vibration damping means

Abstract: 1,218,439. Papermaking. MOUNT HOPE MACHINERY Ltd. 7 June, 1968 [3 April, 1968], No. 27107/68. Heading D2A. [Also in Division F2] A table roll 12 of a Fourdrinier machine is rotatably mounted on a hollow axle 10 by means of fluid bearings 14. Liquid is supplied to the bearings under pressure via the duct 26 and after passing through the bearings, flows into the space 19 between the roll and the axle. Radial projections 66 are provided on the interior surface of the roll and interact with the liquid to damp vibrations of the roll. Annular seals 30 are provided at each end of the roll 20 as to maintain the space 19 substantially full of liquid.

Twisting and forming device for pneumatic and mechanical spinning

Abstract: 1,164,583. Mounting for textile spindle. VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT LEGKOGO I TEXTILNOGO MASHINOSTROENIA. 15 Jan, 1968, No. 2163/68. Heading D1D. A spinning chamber 1 is mounted on a driving spindle 2 mounted in radial air bearings 4 mounted in elastic dampers 5 and a thrust bearing formed by a conical end 7 of the spindle and a flat bearing surface 8. The body 6 in which the bearings are mounted is carried in a further damping element 12 in the frame. The flat bearing 8 is preferably of graphite and is mounted in a shell 9 rotatable in the body 6. The conical end 7 engages the bearing 8 eccentrically and by rotating the bearing 8 a fresh portion of it is presented to support the conical end. The air bearings 4 are also preferably of graphite. The spindle is driven by a belt 3.

Experiments on the stability of water lubricated herringbone-groove journal bearings. 1 - Theoretical considerations and clearance effects

Abstract: Theory and clearance effects on stability of water lubricated herringbone-groove journal bearings

Improvements in or relating to fluid bearings

Abstract: 1,107,721. Bearings. MACHINE TOOL INDUSTRY RESEARCH ASSOCIATION. 14 Dec., 1964 [18 Dec., 1963], No. 50089/63. Heading F2A. In a fluid bearing fluid is introduced between bearing surfaces and retained by means sealing against at least one of said bearing surfaces, the flow of fluid from the bearing being controlled. In Fig. 1, seal 12 is secured to member 11 and seals against member 10. Valves 14a, 15a are provided in the inlet passage 14 and outlet passage 15. In Fig. 3 (not shown), floating seal (16) has its movement limited by projection (17) on member 11, and seals against both members. The bearing surfaces are plane, cylindrical on part-spherical. Inflow valves only or outflow valves only may be provided.

Air-Bearing Applications to Machine Tools and Measuring Instruments

Abstract: This paper attempts to illustrate the advantages and limitations of air bearings in the machine-tool and measuring instrument field by reference to actual industrial applications. It also indicates likely future developments.

Methods of making fluid bearings

Abstract: 1,121,697 Making bearings BRITISH AIRCRAFT CORP (OPERATING) Ltd 12 Oct, 1966 [14 Oct, 1965], No 43638/65 Heading B3A [Also in Division F2] A fluid bearing 11 is provided with a restrictor 14 having a bore 15 therein of pre-determined accurate cross-section, the restrictor 14 being mounted in a pressurized-fluid supply passage 13 which is formed in the bearing and extends to a passage 10 of larger diameter In a method of making the fluid bearing, a brass-mandrel is mounted in a bore 16 of the bearing so as to simulate a shaft which is to be supported by the bearing A thin copper shim is placed into the passage 13 and is forced against the brass mandrel when the restrictor 14, which is a brass bush, is pressed into position The brass mandrel and the copper shim are removed leaving the restrictor 14 lower than the bearing-surface 12 by the amount equal to the thickness of the shim The latter could be replaced by a shoulder formed in the passage 13 and adjacent to the bearing-surface 12 The bearing could be provided with a number of pressurized-fluid supply passages 13 with restrictors 14 therein, the passages 13 serving to provide pressurizedfluid to both radially and axially support the bearing

Improvements in or relating to arrangements for guiding and supporting apparatus rotatable about a vertical axis

Abstract: 1,134,038. Bearings. COMMISSARIAT A L'ENERGIE ATOMIQUE. 28 July, 1966 [28 July, 1965], No. 33984/66. Heading F2A. An arrangement for guiding and supporting a shaft 1 which is rotatable about a vertical axis comprises fluid bearings 6 and 7 and a fluid thrust bearing 8 which is also self-aligning. A shell 22 of each bearing 6 or 7 has three radial grooves 23 therein. Each groove 23 contains a piston 24 which is provided with an integral tube 31. The pistons having grooves 35 therein are encircled by O-rings 34 to facilitate damping. Damping of the thrust bearing 8 is effected through an axially-slidable bearing member 14 which is urged upwardly by a spring 20. Pressurized-fluid is supplied to the bearings 6 and 7 via pipes 21, 21 1 , chambers 33, the tubes 31 in the pistons 24, chambers 29 and radial passages 30; and is supplied to the thrust bearing 8 via a pipe 17, an annular space 16 and passages 18. The shaft 1 carries a rotor 2 of an electric motor having a stator 3 and is bored axially to receive a flexible shaft 44 therein, the latter being coupled to the shaft 1 at a point 45 which is the intersection of the dynamic axis.