Showing papers on "Bearing (mechanical) published in 1987"

Wheel Bearing/constant velocity joint unit

Abstract: The invention relates to a wheel bearing/constant velocity joint unit having a double row bearing 2 which has been provided with at least one inner bearing ring 12 which is separate from the wheel hub 1. The wheel hub and the outer part of the constant velocity joint are form-fittingly and non-rotatingly connected to each other by spur teeth. The spur teeth at the wheel hub are preferably produced by orbital pressing or orbital forging, and while the forming process takes place a collar is produced at the wheel hub which serves for axially tensioning the inner bearing rings, at least the one of the joint end.

Pump with shaftless impeller

Abstract: A pump including an impeller having a magnet or a second conductor therein, the impeller being adapted to be directly rotated by virtue of magnetic fields of stator coils. The impeller is rotated within a casing in close proximity thereto via ceramic bearing members, one bearing member having spiral grooves on its slide surface. The ceramic bearing members constitute a dynamic pressure bearing means.

Seismic design of bridges on lead-rubber bearings

Abstract: A number of time-history dynamic analyses are reported for structures where the following parameters are varied: bearing height, dissipator strength, pier and foundation flexibility, deck flexibility, and earthquake record. The research described in the report was completed in four stages: (1) evaluation of the response of sdof (single-degree-of-freedom) structures, using a model equivalent to the response of a bridge on rigid foundations; (2) investigation of the response with piers of differing flexibility; (3) study of the response of bridges with various combinations of pier and abutment flexibility and bearing arrangements. The final stage (4) reviews the work to establish an alternative design procedure. The new procedure is more straightforward and conceptually clearer than the present design procedures. (TRRL)

Thermal isolation system for turbochargers and like machines

Abstract: Apparatus for cooling and thermally isolating turbocompressor foil bearings. The bearing journal includes a hollow shaft through which gas is positively circulated to cool the shaft. A slinger at one end of the shaft develops a centrifugal pumping action during operation of the turbocompressor by virtue of a plurality of radially directed gas passages. Pressurized gas may be introduced from the compressor into the interior of the hollow shaft and, after traversing the shaft, returned to the compressor. The invention includes arrangements for protecting the bearing against combustion products which may leak past turbine wheel seals by removing such combustion products before they can reach the bearing.

Thermal sensor for detection of railroad bearing failures

Abstract: A thermal sensor composed of a standard bolt which has been modified to embody a temperature sensing element and placed into a bearing assembly of a train. This element contains a heat-sensitive wax that at a preset temperature expands causing the motion of a piston which exposes projections. The projection may function as an antenna either passive (reflective) or active (transmitter) that can be probed from the wayside with very high selectivity.

Bearing structure for downhole motors

Abstract: A unitary sleeve (11) mounts both thrust and radial bearings, the radial bearing (13) being fabricated of macro-crystalline tungsten carbide powder and cemented tungsten carbide cobalt chips in a recessed area (14) on an elongated extension (15) and the thrust bearing comprising a ring (27) carrying diamond inserts (29) residing in through holes (28), the ring (27) and inserts (29), being brazed on a hub (18) at the thrust head end (17) of the extension (15).

Wheel bearing-synchronous rotary joint unit

Abstract: A hub assembly comprising a hub member (10), a flange (4) for wheel attachment, a double row bearing (2), and a constant velocity ratio universal joint (3), wherein the bearing has at least one inner bearing ring (13, 14) which is a separate component received on the hub member, and a connection between the hub member and a further part of the assembly is established by a welding and upsetting operation, and the inner bearing ring is engaged to hold it in position and to set the bearing as a result of such welding and upsetting operation. The welded and upset connection may be provided between the hub member and an outer member (15) of the constant velocity ratio universal joint, or between the hub member and flange. A weld bead formed by the welding and upsetting operation may engage the inner bearing ring either directly or indirectly, or a projection extending from the part welded to the hub member may engage the inner bearing ring.

Performance of elastomeric bearings

Abstract: The work reported here represents the second phase of an ongoing study of elastomeric bearings. Phase I consisted of a state of the art review and the development of a first level design specification. In Phase II, tests and analyses were conducted on elastomeric bearings, and the results were then used to develop design provisions suitable for inclusion in the AASHTO Specifications. The provisions include both refinements of existing methods and a more sophisticated method based partly on existing theory and partly on the results of the tests performed for this project. The study consisted of tests and correlations with theory for monotonic compression, rotation, shear and buckling, and for fatigue in shear and compression. It also included a theoretical analysis of a bearing in a bridge subjected to low temperature.

PCD enhanced radial bearing

Abstract: Bearing rings containing PCD faced bearing inserts are mounted adjacent tungsten carbide radial bearing surfaces at the ends of respective bearing sleeves attached to the drive shaft of a down hole well drilling motor, thereby preventing excessive wear at the extremities of the radial bearing surface in controlled and steerable drilling applications.

Apparatus for detecting bearing shaft wear utilizing rotatable magnet means

Abstract: A device is provided for measuring bearing or shaft wear in an apparatus utilizing a rotating shaft positioned in a bearing. A plurality of magnets are mounted on the rotating shaft and at least three coils forming at least two pairs of coils are mounted on a stationary housing surrounding the shaft. Means are provided for measuring the change in induced voltage for each pair of coils independent of shaft rotation speed, ambient temperature, the flux density of the magnets and the concentricity of the bearing and shaft diameters.

Electric motor with an improved bearing

Abstract: An electric motor provided with a bearing of improved design has a stator (1) supported by a mounting frame (3) and a rotor (4) in rigidly fixed relation to a shaft (5), the shaft being rotatably mounted in a plain bearing (7) placed within a tubular support (8) which is rigidly fixed to the motor frame (3). A sleeve (23) composed of material having a sufficient degree of elastic deformability to absorb vibrations is interposed between the outer face (24) of the bearing (7) and the inner face of the tubular support (8). The electric motor is intended in particular to equip propeller-type fans and is primarily applicable to direct-current motors of the electronic commutation type.

Resiliently mounted fluid bearing assembly

Abstract: A fluid bearing assembly, e.g., air or gas, of the hydrostatic or hydrodynamic type, for use as a spindle and the like, includes spaced journals mounted on a shaft for rotation therewith. The housing includes spaced support bearings cooperating with the journals to form a gas gap therebetween. The support bearings are resiliently mounted in the housing for axial, radial and angular movement through the use of continuous resilient support elements positioned between the housing and the support bearings and continuously in contact with each. The resilient support elements are preferably self-energizing and comprised of relatively low coefficient of friction materials to reduce the friction of the system thus allowing rapid adjustment of the bearing in response to loads on the shaft. Various details are described with respect to the various structures illustrated, including the details of an air bearing spindle assembly of relatively light weight and capable of operating at speeds in excess of 100,000 RPM.

A hydrostatic thrust bearing system

Abstract: A hydrostatic thrust bearing system characterized in that the hydrostatic bearings are axially movable and are held urged against the pressure plate in mutually opposite directions by hydraulic pressure created in a chamber associated with a respective bearing; and in that a servo valve is provided for co-action with an axial-position sensor for controlling the amount of hydraulic fluid fed to a respective chamber and also to control the hydraulic pressure acting on a respective bearing such as to take-up axial loads which vary in magnitude and direction.

Bearing cooling apparatus of heating roller

Abstract: A bearing cooling apparatus of a heating roller wherein the heating roller includes a roller, heating means disposed inside the roller, and a shaft having the roller mounted thereon, comprising a housing having the shaft rotatably supported thereto by bearings attached to the housing and formed with a first passageway and a second passageway, and means for circulating a cooling medium through the first and second passageways. At least one of the first and second passageways extends along the bearing disposed adjacent the heating means and along the shaft and are disposed adjacent the bearing and the shaft.

System for manufacturing connecting rods

Abstract: A two part tool fits into the crankshaft bore of a partially manufactured connecting rod for an internal combustion engine and expands the bore to break the bore housing into two pieces, one of which comprises a bearing cap to permit installation of the rod onto a crankshaft journal. The tool is retracted to fit within the bore for the bearing and a high pressure acts on a piston to provide a high enough force to move two parts of the tool away from each other in direction perpendicular to a bisecting plane that lies along the central axis of the bore and to split the one piece bearing housing into two parts along a place defined by notches which weaken the bearing housing in selected areas. The piston is centered on the bisecting plane of the connecting rod so that the forces are balanced to ensure uniform, repeatable operation. The movement (displacement) of the tool portions and the load on the tool portions are both sensed for control of the test, and also to permit obtaining data on load and displacement relationships for quality control of the parts.

Articulation members for back portion of vehicle seats

Abstract: The articulation member comprises asymetrically guided bearing plates. A fixed flange is shaped in order to support, by means of sectors, sliding bearing plates having an upper toothing pitch corresponding to pitch of a toothing of a movable flange. The bearing plates are normally pushed back from the toothing by elastic means and have positions which are angularly shifted for two of them and submitted to bias of control means such as a cam. An angular shift of two of the bearing plates is of 120°-α/3 (=240°-2/3α) with for complement 120°+2/3α, αbeing an angle forming a pitch for each tooth of the toothed ring and teeth of the bearing plates.

Turbocharger bearing and lubrication system

Abstract: The rotating components of an exhaust gas driven turbocharger are supported by a pair of axially separated ball bearings having an outer race and an inner race. A spacer between the bearings engages the outer race of both bearings and exerts a preload bias on the outer races of the bearings urging the outer races away from one another. Accordingly the bearings are preloaded so that centrifugal forces generated during high speed operation will not force the ball bearing away from the inner races.

Oil feeding device for scroll fluid apparatus

Abstract: An oil feeding device for a scroll fluid apparatus including an oil flow passage in the crankshaft providing oil to the crank pin bearing, an intermediate pressure chamber, and the sealed spaces between the scroll members.

Universal joint alignment checking tool

Abstract: A gaging tool for checking the alignment of spaced apart holes located on a common axis, having particular utility for checking the alignment of bearing seats on half round yokes for universal joints. A pair of gage bushings are secured in the bearing seats by retaining straps. An alignment bar is passed through the internal gage bore of one of the bushings. When the bearing seats or holes are in alignment, the alignment bar will pass into the other of the pair of gage bushings.

Downhole motor bearing assembly

Abstract: A downhole drive shaft (11) and bearing structure having a unitary, generally cylindrical housing (13) with a radial bearing surface (57) affixed to its interior; a drive shaft having a radial bearing surface (55) affixed to its exterior and thrust bearing inserts (41) mounted at the bit end (15) thereof; and a drive shaft cap (19) affixed to the drive shaft and carrying thrust bearing inserts, the thrust bearing inserts of the cap (19) and drive shaft (11) interfacing with oppositely disposed inserts (37, 39) mounted in the housing (13).

Stability of a rigid rotor supported on flexible oil journal bearings

Abstract: This investigation deals with the stability characteristics of oil journal bearings, including the effect of elastic distortions in the bearing liner. Graphical results are presented for (1) steady-state load, (2) stiffness and damping coefficients, and (3) the stability. These results are given for various slenderness ratios, eccentricity ratios, and elasticity parameters. The lubricant is first assumed to be isoviscous. The analysis is then extended to the case of a pressure-dependent viscosity. It has been found that stability decreases with increase of the elasticity parameter of the bearing liner for heavily loaded bearings.

An analytical solution to obtain the optimum source location using multiple direction finders on a spherical surface

Abstract: An analytical solution is presented for determining the optimum location of a radiating source on the surface of a sphere, given multiple bearings The bearings are assumed to have small errors of the order of 0-10 deg The optimum location is found by minimizing the sum of the squares of the perpendicular great-circle distances from the source to the bearing lines This is achieved analytically through an eigenvalue approach, rather than the usual iterative, numerical approach Bearings of different weight are taken into account by approximating the distance from each direction finder to the source The result is general and may have wide application Since it is simple and nearly as fast as the triangulation technique for source location, it is now used in the SUNY-Albany East Coast Lightning Detection Network to compute the optimum location for lightning in real time

lubrication system for a turbocharger

Abstract: A turbocharger having a main housing with a throughbore in which a tubular bearing carrier is mounted. A main shaft having a turbine at one end and a compressor at its other end extends through the bearing carrier and is rotatably mounted to the housing by two spaced bearing assemblies. A lubrication system supplies lubricant to a squeeze film damper for hydrostatically damping the shaft vibrations and the discharge of the lubricant from the squeeze film damper is employed to lubricate the bearing assemblies.

Cylinder head camshaft mounting arrangement

Abstract: The invention relates to a device for mounting two camshafts in the cylinder head of a multi-cylinder in-line internal combustion engine having especially four valves per cylinder, the device comprising bearing housings supported on the cylinder-head housing To make it possible to provide a cylinder head with small valve angles and with more than four cylinder-head screws per cylinder, the bearing housings are accommodated in a camshaft bearing frame consisting of longitudinal and transverse webs and produced separately from the cylinder-head housing

A static pressure gas bearing assembly

Abstract: A static pressure gas bearing assemby having a gaseous fluid discharging bearing member for supporting a shaft by the discharged gaseous fluid is disclosed. The bearing member is made of porous graphite. For the manufacture, carbon particles approximately 80% of which have particle diameters not greater than approx. 40 microns, more particularly, particle diameters ranging from 1-20 microns are used. The carbon particles are subjected to molding, calcination and graphitization, whereby a porous graphite member having pores distributed substantially uniformly is obtained. In another aspect of the invention, the bearing member is made of a porous graphite material having a specific degree of swelling. Also, in another aspect, the surface of the shaft to be supported by the bearing member is coated with titanium nitride by ion plating treatment. In this manner, a high-precision and high-prerformance bearing assembly can be provided with reduced manufacturing costs.