Showing papers on "Thrust bearing published in 1969"

Coated fluid bearing foils and fabricating method

Abstract: A method of providing an improved fluid foil bearing by coating the foil segments with a solid lubricant. Coated foils for both journal and thrust bearings are also disclosed.

Method for Solution of Lubrication Problems With Temperature and Elasticity Effects: Application to Sector, Tilting-Pad Bearings

Abstract: The importance of temperature and elasticity effects in bearings have been demonstrated by several authors. This paper offers an efficient method for the simultaneous solution of the Reynolds and energy equations and their coupling with elastic deformation results obtained by variational techniques. Results are presented for centrally pivoted, tilting-pad, sector, thrust bearings.

Gas- or liguid-lubricated hydrostatic double-action thrust

Abstract: A gas- or liquid-lubricated hydrostatic double-action thrust bearing intended for taking axial loads in machines, for example, in centrifugal pumps. The bearing has a disc-shaped thrust plate with collars located at both sides thereof, the collars being mounted in the stationary body of the machine, which is also provided with passages for supplying power fluid into the face space, which, together with a collar, forms an annular chamber. The annular chamber through annular gaps communicates with a reduced pressure space and with a chamber located at the opposite face of the thrust plate, which, in turn, communicates with the reduced pressure chamber through a gap which is closer to the longitudinal axis of the thrust bearing than the said annular gaps.

Variable speed motor drill

Abstract: A down-hole rotary drilling tool adapted to be driven by hydraulic or pneumatic power with the latter under control of a centrifugal speed regulator establishing drilling speed independently of torque loads. The drilling tool being connected to drill pipe string for suspending the drill bit in formation has novel-type thrust and motor bearings, including loadmodifying means responsive to compression or tension loads on shaft causing loads to be applied as compression loading on thrust bearing. Axially adjustable bearings for motor accept radial and thrust loads. Novel blade arrangement for rotor prevents binding from blade distortion due to pressure of flowing liquid. Pressure relief valve and internal rotating dump valve relieve against excessively high and minimum low pressures in flow through tool.

Reciprocating pump having improved crankshaft bearing arrangement

Abstract: In a pump employing a crankshaft to reciprocally drive pistons within cylinders, the crankshaft is rotatably supported within the pump housing by a forward and an intermediate thrust bearing unit and a rearward straight bearing unit.

Paper 13: Tilting Pad Thrust Bearings: Factors Affecting Performance and Improvements with Directed Lubrication

Abstract: The effect on flooded tilting pad thrust bearing performance of a number of external variables is examined. At sliding speeds between 10 and 100 m/s, and for specific pressure between 15 bar and 55 bar, measurements were made of oil film thickness, bearing temperature, and power loss for various oil inlet systems, oil quantities, housing pressures, and degrees of misalignment. Power consumption in high-speed thrust bearings can be safely reduced by the use of directed lubrication with a drained casing, bearing temperature being reduced and oil film thickness increased.

Paper 11: Hot Oil Carry-Over in Thrust Bearings:

Abstract: Six sets of experimental results concerning 14 different thrust bearing assemblies of varying type and size are analysed to find the extent of hot oil carry-over. Temperature readings from 729 pads are used in the analysis. The percentage of exit heat carried over k is shown to vary between 80 and 60 per cent, depending on sliding speed and bearing type. The temperature at entry to the pad is shown to be higher than the housing supply temperature by a simple multiple of k applied to the temperature rise along the pad. Since no formal method exists at present for the calculation of operating viscosity in thrust bearings, it is hoped that this work will form a contribution in the design procedures for thrust bearings.

The Rheostatic Thrust Bearing Using a Power Law Fluid as Lubricant

Abstract: The use of power-law lubricant in a rheostatic thrust bearing with a variable film thickness is considered. It is found that for maximum load capacity the film thickness function is a step function. In this case a relation between film thickness ratio and step radius is obtained. For a constant film thickness, the load capacity increases as n, the flow behaviour index decreases. However in the case of stepped bearing the maximum load capacity can increase or decrease with respect to n depending on the film thickness ratio.

Mean Free Path Effect in Spiral-Grooved Thrust Bearings

Abstract: : The objective of the paper is to study the effect of the mean-free path on the steady-state performance characteristics of a spiral-grooved thrust bearing operating in extremely thin film and/or low ambient pressure environments. Numerical results for the most popular three versions of the spiral-grooved designs are presented. These results reveal that the effect of slip boundary conditions could contribute substantial reduction in performance. Helium is the worst gas lubricant in this sense because of its high Knudsen number. The slip-flow corrected results check well with recently published experimental data. (Author)

Motor bearing and fan construction

Abstract: An electric motor in accordance with the invention disclosed herein comprises a stator coaxial with and separated from a rotor by a radial or journal bearing arrangement including a pin rotatably received in a sleeve. One end of the pin comprises a thrust face which bears against a thrust bearing to prevent axial movement of the motor, In one embodiment, the thrust face is convex and the thrust bearing is a flat jewel or plastic member. In another embodiment, the thrust face is flat and the thrust bearing is a spherical jewel. In still another embodiment, the thrust face is concave and the thrust bearing is a spherical jewel. For taking up axial play, an adjustably mounted resilient plug member is moved into close proximity with the other end of the pin. Fan blades are mounted on the periphery of the rotor and rotate within a housing coupled to the stator.

Paper 6: Turbulent Lubrication Theory Applied to Fluid Film Bearing Design:

Abstract: The fluid film bearing designer is encountering situations of turbulent lubrication with ever-increasing regularity. This paper is not concerned with the fundamentals of turbulent lubrication but more with an assessment of the methods available to the bearing designer for the examination of turbulent flow conditions and with the effect of turbulence. The two main ‘engineering’ approaches to turbulence are delineated and their quantitative predictions compared for the case of a finite width plane inclined slider thrust bearing hydrodynamically lubricated with an isoviscous incompressible fluid.

Improvements in or relating to Bearings

Abstract: 1,168,914. Welding by fusion. GLACIER METAL CO. Ltd. 16 May, 1968 [16 May, 1967], No. 22590/67. Heading B3R. [Also in Division F2] A plain journal bearing having a steel backing 2 has flanges 6 and 7 integrally united with it by an electron beam weld. The edges of the journal are chamfered at 4 and 5 and abut corresponding chamfered surfaces 8 and 9 on the flanges. On application of an electron beam the material of the abutting surfaces fuse. The cylindrical surface of the bearing may be provided with linings 3 of aluminium tin or sintered copper lead, and the flanges which may be employed as thrust bearings, may be provided with linings 10 and 11 of white metal, babbit or cast copper lead.

Combination thrust-radial bearing

Abstract: An improvement of a plastic bearing wherein a separately prepared thrust bearing portion and radial bearing portion are combined into one body to enable them to carry thrust and radial frictions respectively.

Improvements relating to variable-ratio frictional drives

Abstract: 1,167,342. Variable-speed friction gearing. ENGLISH ELECTRIC CO. Ltd. 21 Feb., 1967 [24 Feb., 1966], No. 8296/66. Heading F2D. To provide output-torque-responsive traction loading in a variable-speed friction gear of the type comprising at least two sets of precessiontiltable idle rollers 26, 27 between end toric discs 16, 17 rotatable with an input shaft 11 and a double toric disc 22 rotatable with an output shaft 12 and wherein carriages 31 in which the rollers 26, 27 are rotatably mounted are approximately tangentially movable to steer the rollers by rotational movement of a control sleeve 45, torque reaction from the carriages 31 is transmitted by the control sleeve 45 through a linkage, including external ratio-control means, to a thrust member which acts on the disc 16 through a thrust bearing and a thrust amplifying device rotating with the input shaft, part of the reaction from the thrust amplifying device being taken on the adjacent one of two collars, e.g. 82, 80 fast on the input shaft axially outwardly of the discs 16, 17. The carriages 31 are supported by T-shaped rockers 37 pivoted at 36 on a fixed spider 23 and connected to the control sleeve 45 at their inner ends 42a by pins 42 sliding on the rockers and pivoted in the sleeve. Each carriage/rocker support may comprise two ball and socket connections 32 as shown, or one two-way locating ball and socket and one sliding ball and cylinder connection. Stabilization after precession is provided for by a castor angle of 5-15 degrees between each roller carriage centre line and planes normal to the gear axis. Slight radial clearance with the input shaft 11 and the spider 33 allows the control sleeve 45 to equalize roller loads. Initial load is by a Belleville washer 43 between the discs 17 and the collar 80. As shown, a double bell-crank 57 is connected by rods 51 to the control sleeve 45 and by a swivel joint 60 to a lever 62 in turn connected to rotate a thrust member 73. The latter is in screw engagement with a fixed housing part 14 so that rotation of the member 73 effects axial movement of said member and, through a bearing 74, a sleeve 77. The thrust amplifying device comprises balls 85, 87 engaging bi-directional cam grooves 84, 86 between the disc 16 and collar 82 and a cam member 83. The sleeve 77 is connected by splines 82A and 81 to the collar 82 and the cam member 83, one of the splines being helical and the other spline of opposite hand or straight. Axial thrust of the sleeve 77 thereby results in an amplified axial thrust on the disc 16, the collar 82 taking most of the reaction. For external control of ratio, the fulcrum pin 65 of the lever 62 is adjusted by a mechanical, electric, pneumatic or, as shown, hydraulic (piston and cylinder) device 70 which may be controlled automatically in response to output or input torque or speed to maintain any one of these factors constant. In Figs. 3, 4 (not shown), a lever (100) connected to the double bell-crank 57 and provided with a ratio-adjusting movable fulcrum (102) is connected by a further bell-crank (106) to a lever (104) so provided with two fulcra (110), (112) that movement of the levers (100), (104) in either direction results in a unidirectional (rightward) movement of a thrust bearing (118). The thrust amplifying device between the thrust bearing and the disc 16 comprises a radially disposed lever means reacting on a collar (126) of the input shaft 11, the lever means comprising a Belleville-washer-like member (122) which may have radially inwardly or outwardly extending radial slots, or an arrangement of radial levers.

Bearing for the shaft of an electric motor

Abstract: The bearing comprises two bearings, or bearing elements, proper, one of which is stationary and the other of which a spring holds pressed against the motor shaft.

Analysis and performance of the gas-lubricated tilting pad thrust bearing.

Abstract: Gas lubricated tilting pad thrust bearing analysis and performance, determining optimum hydrodynamic crown profile

Friction welding apparatus

Abstract: In a friction welding machine one workpiece chuck is urged by a ram or rams towards a second workpiece chuck which is rotatable. The second chuck is supported in bearings with freedom for limited axial displacement under axial thrusts transmitted to it from the ram or rams through the workpieces and is supported against the thrusts by a hydrostatic thrust bearing.

Thrust bearing assembly

Abstract: A thrust-bearing assembly having a plurality of adjacent bearing shoe segments supported such that when a load is added concentrically on one bearing shoe segment, the load is automatically divided among and received on adjacent bearing shoe segments positioned on both sides of said one bearing shoe segment through seesaw action of spring plates supporting the bearing shoe segments, whereby oil cut and overheat due to the concentric load can effectively be prevented.

Twisting and forming device for a pneumatic spinning system

Abstract: A twisting and forming device for a pneumatic spinning system includes a twisting and forming bowl supported on a shaft mounted for rotation in a pair of radial bearings adapted to be lubricated by a compressed air and also a thrust bearing assembly. The radial bearings are rigidly connected with each other and are supported on an elastic shock damping member common to both of them, the thrust bearing assembly also being adapted to be lubricated by compressed air. The thrust bearing assembly is disposed between the twisting and forming bowl and the upper of the two radial bearings, a bearing plate of the thrust bearing assembly being formed as an annular ring mounted around the rotary shaft of the device.

Pin and socket pinion bearing for rack and pinion assembly

Abstract: AN INEXPENSIVE PINION MOUNTING FOR RACK AND PINION ASSEMBLIES USEFUL IN AUTOMOTIVE STEERING GEAR HAVING COOPERATING SOCKET AND PIN OR SPIGOT PARTS PROVIDING RADIAL AND THRUST BEARING SURFACES SUPPORTING A FREE END OF THE PINION AND COACTING WITH AN ADJUSTABLE ANTI-FRICTION RADIAL AND THRUST BEARING TO ROTATABLY MOUNT THE PINION AND HOLD IT AGAINST AXIAL SHIFTING IN A HOUSING FOR THE ASSEMBLY.

Hydrodynamic thrust bearing for axial piston-type pump or motor

Abstract: AN AXIAL PISTON-TYPE PUMP OR MOTOR HAS A HYDRODYNAMIC THRUST BEARING ARRANGEMENT DISPOSED BETWEEEN THE HOUSING AND CYLINDER BARREL THEREOF. SUCH BEARING ARRANGEMENT COMPRISES A BEARING HOLDER AND A BEARING RING MOUNTED IN CIRCUMFERENTIAL COUNTERBORES FORMED IN THE HOUSING AND BEARING HOLDER, RESPECTIVELY. A CYLINDRICAL SPACER SLEEVE IS DISPOSED BETWEEN THE BEARING HOLDER AND A PORT PLATE TO AID IN POSITIVELY MAINTAINING THE INTEGRATED STRUCTURES IN THEIR CORRECT POSITIONS. A FLUID PASSAGE IS DEFINED BETWEEN THE SPACER SLEEVE AND THE CYLINDER BARREL TO COMMUNICATE LUBRICATING FLUID TO THE THRUST BEARING.

Bearing and gimbal lock mechanism and spiral flex lead module

Abstract: The invention relates to a two-axis gimbal supported payload of an orbital spacecraft. In normal orbit operation, the gimbal is supported along each of its rotational axes by a sleeve and thrust bearing assembly permitting pivotal motion of the gimbal in response to relatively low amplitude loads occasioned by orbital forces. Initially, the sleeve and thrust bearings are disengaged from the gimbal and a gimbal lock mechanism restrains pivotal motion of the gimbal during launch of the spacecraft. The gimbal lock mechanism further sealably contains the sleeve and thrust bearings thereby isolating them from contaminants until attaining a required orbit. A spring motor is actuated to disengage the gimbal lock mechanism and engage the sleeve and thrust bearings subsequent to launch. Electrical conductors in the form of metal strips, together with an associated insulating strip, are wrapped spirally about a rotational axis of the gimbal to provide power conduction to the gimbal payload without introduction of restraining forces which would interfere with the angular movement of the suspended gimbal.

Paper 16: Tilting Pad Thrust Bearings: Rapid Design Aids:

Abstract: Two slide chart design aids are developed for tilting pad thrust bearings in order (a) to give guidance on load-carrying capacity, considering such limits as allowable oil film thickness and maximum pad temperature, and (b) to enable the designer to estimate directly the total power loss in double thrust bearing assemblies. These slide charts (each consisting of two sheets) enable variables such as pad size, number of pads, oil specification, specific load, and collar speed to be considered individually. Thus the designer has a tool from which he can obtain a ‘feel’ for bearing performance and see at a glance the interplay between all the variables.

Development of Novel Gas Bearing Supported Cryogenic Expansion Turbines

Abstract: This paper describes some problems and results associated with the development of gas-bearing supported cryogenic turbines. Although hydrostatic (externally pressurized) bearings were used during much of the experimental work and in the developed hardware, most of the remarks and results are applicable in the case of the so-called hydrodynamic gas bearing as well.