Showing papers on "Bearing (mechanical) published in 1970"

Hydrodynamic Lubrication of Journal Bearings by Pseudo-Plastic Lubricants : Part 2, Experimental Studies

Abstract: Few experimental investigations on the relation between the nonlinearity of lubricants and the performance of bearings have been published. Theoretical analysis of the relation was presented in the first paper, and experimental analysis of this problem is conducted in this paper. The initial viscosity and the coefficient of pseudo-plasticity are given by the investigation of the flow rate of pseudo-plastic fluids obtained by adding polyisobutylene to spindle oils. The coefficient of pseudo-plasticity is a scale to indicate the behavior of this lubricant. Analyzing the experimental results of the performance of bearings using this lubricant, it is found that the film pressure and the load capacity of pseudo-plastic fluids are smaller than those of Newtonian fluids whose viscosity is equal to the initial viscosity. These values become smaller with an increase in nonlinear factor and eccentricity ratio of bearing.

Multiple surface fluid film bearing

Abstract: A magnetic memory system having a recording head adjacent a movable disk is described wherein the recording head is separated from the disk by a fluid bearing. In a preferred embodiment, the bearing comprises a taper land bearing having a main bearing face preceded by a converging bearing face. A narrow slot provides a hydrodynamic separation between the trailing edge of the main face and the leading edge of a satellite face coplanar with the main bearing face. A diverging face is provided aft of the satellite face. In operation the recording head is retracted until the disk is up to its usual rotational speed, and then the head is advanced toward the disk to its final floating position in the order of 30 microinches from the surface. The satellite face and diverging face cooperate during the transitional ''''landing'''' of the recording head to produce a fluid film force that pivots the recording head to its final floating position without contact between the disk and head.

Resilient bearing adapters for railway trucks

Abstract: A railway truck having a resilient pad positioned between the bearing adapter and side frame. The resilient pad includes a body of elastomer in compression load carrying relation between the load carrying surface of the side frame and load receiving surface of the bearing adapter with an upper surface conforming to the load carrying surface and a lower surface conforming to the load receiving surface. The body has integral spaced flanges extending upwardly beyond the upper surface in straddling engagement with the side frame. In addition, the body and bearing adapter includes portions integral therewith providing means interlocking the lower surface of the body relative to the bearing adapter.

Bearing arrangement with magnetic fluid defining bearing pads

Abstract: A bearing wherein a fluid bearing pad is sealed between two bearing surfaces, such as between an inner race and an outer race. A permanent magnet and permeable pole pieces define a magnetic circuit which circuit provides for the flow of magnetic flux across at least one of the bearing surfaces. A magnetic gap on the bearing surface through which the magnetic flux flows defines a predetermined continuous peripheral pattern. The magnetic flux is concentrated at the gap and a magnetic fluid is captured therein. The other bearing surface engages the magnetic fluid in sealing relationship and the fluid-bearing pad is sealed between the bearing surfaces and within the periphery defined by the magnetic fluid seal.

Composite shaft with integral end flange

Abstract: A composite shaft with an integral end flange fabricated of a plurality of layers of high modulus fibers of selected fiber orientation positioned between and bonded to protective outer and inner layers as required and to one another such that each layer extends the full length of the shaft and the flange. The shaft layers may be of sandwich construction and may be asymmetric and the flange periphery may include doublers of bearing material.

Fatigue Life of Tapered Roller Bearings under Minimal Lubricant Films

Abstract: A series of fatigue tests were run on a 3.25 inch O.D. tapered roller bearing to establish the effect on bearing life of lubricant film thicknesses in the 0.5–4.0 micro-inch range. Based on the ratio of calculated film thickness to composite surface roughness, results from eleven individual tests indicate the bearings operated normally under conditions which should have resulted in drastic life reductions according to other investigators' results published in the literature. In the tests fatigue life varied with film thickness raised to the 0.84 power with operating temperature and viscosity appearing to have influenced fatigue life over and above their influence through film thickness. Several explanations of the observed results are discussed. Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference held in Houston, Texas, October 14–16, 1969

Worn bearing indicator

Abstract: An earthboring drill or the like having cutters mounted on bearings including a plurality of bearing segments is described. An insert is provided within at least a portion of the segments with a clearance from the original bearing surface of an amount just equal to acceptable wear of the segment, so that when the segment wears down the insert has substantial contact with adjacent bearing surfaces to provide a remotely sensible signal indicative of bearing wear. In one embodiment, the insert is formed of tungsten carbide or other similar hard material that causes the bearing to jam or lock, thereby increasing torque on the drill bit, which is sensed by the driller. In another embodiment, a mobile marker, such as a liquid radioactive material or dye, enclosed in a frangible container employed as the insert, and the release of dye or radioactive material when the insert contacts a bearing wall provides an indication of bearing wear.

Supporting device for pivotal guide blades in thermal turbo-machines

Abstract: A device for supporting and sealing pivotal guide blades of turbo-machines, particularly of small gas turbines, in which the blade shaft serving as adjusting shaft for the guide blade is supported in a bearing bush which is fitted within the bearing support of a housing; the blade shaft, the bearing bush and the bearing support are thereby so dimensioned and selected from such materials as regards their coefficients of expansion that the necessary clearance for proper operation will exist at every operating temperature in at least one of the resulting fits.

Bearing support assembly for dynamoelectric machines and a method of manufacture therefor

Abstract: In a preferred form, a bearing support assembly for dynamoelectric machines carries one end of the machine shaft so as to limit axial shaft movement. The shaft end is rotatable in a bearing which is axially confined on the shaft by a thrust collar. First and second annular retaining springs are mounted in the end of one of the housing case parts so as to provide support for opposite sides of the bearing. The method of assembling the shaft to the case part includes mounting the first retaining spring, the bearing, and the thrust collar to the shaft end and mounting the second retaining spring within the case part. The shaft is inserted axially into the case part so that the bearing initially engages the second retaining spring. The shaft end is pressed further until the first retaining spring snaps into place within the case part, whereupon the bearing support assembly is completed and the shaft end is supported therein with a predetermined axial end play.

Resilient mounting arrangement

Abstract: A propeller shaft bearing is carried in an inner ring connected to an outer ring by a resilient annular membrane. The outer ring is secured to a vehicle body portion. An annular member extends from one of the rings towards the other and upon relative displacement of the rings resiliently engages the other ring to provide an increased spring rate for the membrane to resist further relative displacement of the rings.

Performance of Large Steam Turbine Journal Bearings

Abstract: Behavior of 16 and 20-inch diameter bearings of elliptical and pad types are examined for speeds ranging up to 5000 rpm and loads up to 1200 psi. The higher power loss, greater oil film thickness, and oil feed requirements are evaluated for the turbulent oil film conditions existing at the upper test speeds. The laminar-turbulent transition speed is found to be strongly related to bearing loading. Presented at the 25th ASLE Annual Meeting in Chicago, May 4–8, 1970

Combined turbine nozzle and bearing frame

Abstract: A turbine engine having a gasifier turbine rotor and a power turbine rotor, a bearing frame providing a bearing support for the shaft of the gasifier turbine rotor, the bearing frame and a turbine nozzle being integrally formed to provide a continuous annular passage between the rotors, support struts extending radially across the annular passage within the bearing frame being integrally formed with respective vanes extending radially across the annular passage within the turbine nozzle to simplify construction of the turbine engine and reduce flow disturbance within the annular passage.

Stable journal bearing

Abstract: The stability and the load capacity of a journal bearing are improved over conventional non-tilting pad hydrodynamic bearings for supporting the rotating shafts of relatively large machines, such as turbines and generators. The present bearing is considerably cheaper and easier to manufacture than tilting pad journal bearings. The bearing comprises a plurality of tapered segments or lobes which are separated by axial grooves in its inner surface.

Clutch control bearings

Abstract: A clutch control bearing wherein adjustment to compensate for eccentricity with respect to a shaft is accomplished by a resilient mounting interposed between a raceway and a hub plate. A wobble plate may be employed to permit further adjustment relative to the shaft.

Torque release adapter

Abstract: A torque release adapter comprising a receptacle and rigid plate rotatably mounted therein with confronting surfaces normal to the axis of rotation, said surfaces containing recesses in which are mounted bearing members, and means for yieldably applying pressure to the parts to constrain the bearings to said recesses to transmit torque from one part to the other, said yieldable means being yieldable to a torque in excess of a predetermined adjustable amount to permit the parts to separate so that one part rides over the bearing members relative to the other part a distance corresponding to the distance between recesses and then become re-engaged with the bearing members.

Elastomeric rotor blade mount

Abstract: An elastomeric rotor mounting structure for a helicopter blade is provided. In the mounting, a blade grip is coupled to a yoke structure by means of radial-thrust elastomeric bearings and the yoke structure is connected to the rotor hub. The elastomeric bearings simplify the rotor design and eliminate the need for bearing lubrication.

An Experimental Study of the Stabilizing Effect of Floating-Bush Journal Bearings

Abstract: While floating-bush bearings have been used in high-speed turbomachinery in recent years, there have been few investigations of the dynamic performances of such bearings. Experiments on the stability of a rotor with floating-bush journal bearings were carried out in this study. It was found that although the floating-bush would hardly rotate until the shaft speed reached the point where the oil-whirl occurred, the floating-bush stabilized the rotor system in a higher speed range. The stabilizing effect of the floating-bush bearing was conspicuous when the ratio between inner and outer clearance and the absolute clearance were large. It was also seen that the bush speed depended on its dimensions, particularly on the inner clearance and approached a nearly constant value as the shaft speed increased.

Gas lubricated bearing

Abstract: GAS LUBRICATED BEARING SYSTEM COMPRISING A ROTATING MEMBER HAVING A PAIR OF AXIALLY DISPOSED JOURNALS FORMED OF SURFACES OF REVOLUTION, E.G. CONICAL JOURNALS, AND A PAIR OF RESILIENTLY SUPPORTED NON-ROTATING BEARINGS FORMED OF SURFACES OF REVOLUTION, E.G. CONICAL SURFACES, IN JUXTAPOSED POSITION WITH RESPECT TO SAID JOURNALS, FORMING A GAS RECEIVING ZONE BETWEEN SAID JOURNAL AND BEARING SURFACES, AND A LUBRICATING GAS FILM IN SAID ZONE, THE RESILIENT SUPPORT FOR EACH OF THE NON-ROTATING BEARINGS INCLUDING A RADIAL SPRING SUPPORT SYSTEM REACTING AGAINST A RIGID HOUSING, MEANS FOR HYSTERSIS DAMPING OF THE BEARING SYSTEM, E.G. ELASTOMERIC SEAL MEANS BETWEEN THE BEARINGS AND RIGID HOUSING, AND AN AXIAL SPRING SUPPORT SYSTEM REACTING AGAINST THE PAIR OF NON-ROTATING BEARINGS, AND PERMITTING FORCE INTERACTION BETWEEN THE BEARINGS, PROVIDING A RAPIDLY RESPONSIVE HIGHLY STABLE DAMPING SYSTEM.

Supporting and sealing member for rolling bearings

Abstract: A member for supporting and sealing of rolling bearings of any type, which mainly comprises a reinforcing portion and a sealing portion, the sealing portion being of an elastic material which, by way of a suitable joining method, e.g. vulcanization, is rigidly attached to the reinforcing portion. Said reinforcing portion being formed to provide a supporting surface for the outer race ring of the rolling bearing and/or for the end surfaces of the rolling bodies. The sealing body and the reinforcing ring thereby forming a unit which supports and seals the bearing in a proper manner, and at the same time secures the outer race ring from rotating in its bearing seat. Furthermore, the member is thus formed that it also serves as a connecting member, which keeps the bearing parts and the member itself together when unassembled. The dismounting of such a bearing unit also will be facilitated as the bearing keeps to the member during dismounting.

Analysis of Unbalance Vibration of Rotating Shaft System with Many Bearings and Disks

Abstract: A method is presented for calculating the unbalance vibration of a rotating shaft system consisting of variable cross sections, disks, journal bearings and unbalances. Property of oil film bearing is assumed to be that of the springs and dampers including those which give resistance to the change of inclination angles and velocities of inclination angles. These latter springs or dampers will be called "rotational" springs or dampers. These coefficients of cylindrical journal bearings are derived from the short bearing approximation. It is concluded that the property of rotational springs and dampers of oil film in the bearing cannot be neglected, and that the calculated results obtained by means of this method agree very well with most of the experimental results for the case of rotating shaft systems with two or three cylindrical journal bearings, that of an overhung shaft system, and that of a shaft system with distortion.

Truck bed cover

Abstract: A cover for pickup truck beds, said cover releasably hinged on a horizontal axis to the forward end of a pickup truck bed; and an inverted U-shaped stand pivoted to a rearward portion of said cover and having legs with bearing means slidably operable in tracks secured in generally horizontal disposition at opposite inner sides of said pickup truck bed

Total knee joint prosthesis

Abstract: A prosthetic knee joint is formed from a polymeric bearing member, with an upstanding shank received in the femoral shaft, and a metallic rocking member inserted into the tibia. The rocking member, having a stem with a disk below the bearing member abutting the tibia, is pivotally supported with the aid of a transverse pin in the bearing member which is partly out away at the rear to permit a relative swinging of the two members over an arc of about 120 DEG .

Intermediate bearing for supporting a divided line of drive shafts in a motor vehicle

Abstract: Intermediate bearing for supporting a divided line of drive shafts between gearbox and driving axle of a motor vehicle includes an elastic ring supporting, in a bearing casing securable to the vehicle, a bearing holder ring, which accommodates a pair of packing rings and an inner bearing ring pressable onto a lay shaft of the divided line of shafts, the elastic ring being formed of elastomeric material for affording axial, radial and angular movements of the bearing holder ring relative to the bearing casing, the elastic ring being shaped as a tire having a substantially cylindrical main body enclosing the bearing holder ring and having at both axial ends thereof a respective ring of radially extending bracing projections prestressed by the bearing casing, and an annular rib located between the rings of bracing projections and being radially spaced from the casing.

Endless track pin assembly

Abstract: A track pin assembly for an endless track including a plurality of track shoes pivotably connected by hinges including tapered seals protecting a spherical bearing which is mounted on an adjustable diameter track pin. The track pin is rigidly connected to a portion of one track shoe and a portion of the bearing which is secured to the adjacent track shoe.

Centrifugal pump with hydrostatic bearing

Abstract: A VERTICAL SHAFT, CENTRIFUGAL PUMP HAS A STEADY BEARING IN THE FORM OF A RADIAL HYDROSTATIC BEARING THAT JOURNALS THE SHAFT, THE HYDROSTATIC BEARING BEING ENERGIZED BY LIQUID CIRCULATED TO IT FROM THE DISCHARGE ZONE OF THE PUMP IMPELLER, THE CIRCULATION OF THE BEARING-ENERGIZING LIQUID BEING ACCOMPLISHED BY AN AUXILIARY CENTRIFUGAL IMPELLER DRIVEN BY THE SHAFT, THE AUXILLIARY IMPELLER-PREFERABLY BEING MOUNTED ON THE MAIN PUMP IMPELLER.