Showing papers on "Thrust bearing published in 1986"

Optical deflector with a pneumatic and a magnetic bearing

Abstract: An optical deflector for deflecting a laser beam from a laser by rotating a polygon mirror uses a dynamic pressure pneumatic bearing as a radial bearing and a magnetic bearing as a thrust bearing. The deflector includes a hollow rotor rotatable integrally with the mirror, a stationary shaft received in said hollow rotor, a casing member accommodating the rotor and stationary shaft, and an annular rotor magnet assembly mounted on the outer periphery of the rotor. A first rotary magnet is mounted in an upper end portion of a rotary shaft and a first stationary magnet in an upper end portion of the stationary shaft in such a manner as to face each other with the same polarity, a repulsive force acting between the two magnets serving as a thrust magnetic bearing. A second stationary magnet is arranged to face the first rotary magnet with the same polarity. Further, a second rotary magnet is mounted in a lower end portion of the rotary shaft and a third stationary magnet in a lower end portion of the stationary shaft in such a manner as to face each other with the same polarity.

Hydrodynamic thrust bearing

Abstract: A hydrodynamic thrust bearing adapted for positioning between a fixed base and a moving member spaced from said fixed base, the moving member having a rigid flat face confronting the fixed base, wherein the hydrodynamic thrust bearing includes a thin metal disk having undulations extending radially outward from the center of the disk in a symmetrical manner throughout one entire surface of the metal disk, and a planar face on the other side, the disk is positioned between the fixed base and the rigid flat face of the moving member whereby the undulations of the disk are in contact with the rigid flat face and the planar face is in contact with the fixed base, lubricant is supplied between the disk undulation and the confronting rigid flat face of the moving member whereby thrust movement relative to the disk will produce a very thin film of lubricant between the undulations of the disk and the cooperating rigid flat face of the fixed base.

Method and device for spin-testing of turbocharger rotor

Abstract: Method of effecting a spin-testing of a turbocharger rotor with its shaft portion fixed to a simulation attachment assembly consisting of components parts which include a thrust bearing, a spacer, a sleeve or compressor rotor, and a lock nut, wherein an integral composite member is formed from at least two parts of the component parts. The testing device includes the attachment assembly with the integral composite member, and a bearing housing for supporting the turbocharger rotor and the attachment assembly rotatably as a unit.

Hydraulically supported thrust bearings

Abstract: A thrust bearing particularly suitable for use with a vertical shaft machine has a rotating ring mounted to the shaft for rotation with the shaft and having a downwardly directed bearing surface. A base ring is positioned around the shaft and fixedly mounted to a machine foundation. A plurality of segmented bearing shoes extend around the shaft and have upwardly directed bearing surfaces for bearing engagement with the bearing surface of the rotating ring. Each shoe is supported from the base ring by a plurality of hydraulic elements which in one form are cylinders fixed to the base ring with pistons extending axially therefrom to engage the respective bearing shoe. Each cylinder is connected to a manifold to provide to each cylinder a hydraulic fluid under pressure. Because the source is common, each cylinder has hydraulic fluid at the same pressure. The hydraulic elements (cylinders and pistons) for each shoe, are distributed or arranged in a pattern which provides a substantially planar surface to each bearing shoe under load.

Double bearing type fishing reel

Abstract: A protrusion, which has three stepped recesses inside, is formed on an outer surface of a spool cover at the center which is a confronting member of a spool. A thrust bearing is fixedly set in the bottom of the recess, and a bearing is fitted in the recess. A guide member is fitted in the recess. The guide member and the bearing are prevented from coming off by a spring washer. The guide member has an inserting hole into which a spool shaft is inserted which is slightly larger in diameter than the inside diameter of the bearing. The guide member has a tapered guide surface around the inserting hole to guide the spool shaft to the inserting hole. The guide surface and the inserting hole enables smooth insertion of the spool shaft into the bearing.

Electric machine having magnetic bearing means

Abstract: An electric machine comprises a stator 7 and a rotor 17 mounted on a rotor shaft 15. In order to preclude axial vibrations of the rotor shaft the machine is provided with a first magnet 19a incorporated in a thrust block 19 and a second magnet 23 on the rotor shaft. The first and second magnetic means cooperate with each other to urge a bearing portion 15a of the rotor shaft against a bearing surface 19b of the thrust bearing with a predetermined pressure.

Tapered friction bearing assembly.

Abstract: A bearing structure including first (33, 35) and second (25, 27) tapered bearing surfaces for accommodating on-bottom and off-bottom thrust and radial forces on a drive shaft (17) in a down hole drilling environment and further including a radial bearing (29, 31) mounted between the first (33, 35) and second (25, 27) tapered bearings for restricting bending of the drive shaft (17).

Drill bit having a thrust bearing heat sink

Abstract: A roller cutter drill bit adapted to drill bores in the earth comprising a bit body of steel having a plurality of bearing journals at its lower end, and a plurality of roller cutters, each having a recess therein receiving one of the journals. A radial bearing asembly for each roller cutter rotatably mounts the roller cutter on the journal, and an axial or thrust bearing assembly at the free end of each journal carries axial forces applied to the roller cutter during drilling, with the thrust bearing assembly thus being subject to rotary frictional forces and heating upon rotation of the drill bit during drilling. According to this invention, a heat dissipation member formed of material having higher thermal conductivity than steel is incorporated into the bit body. This material extends from the free end toward the attached end of the journal for conducting heat away from the thrust bearing assembly, thereby reducing bearing temperatures and providing longer bearing life.

Evaluating Tilting-Pad Thrust Bearing Operating Temperatures

Abstract: An analysis of tilting-pad thrust bearing operating temperatures is described. The analysis includes an evaluation of various tem­ pera-ture locations based on their ability to reflect bearing operating conditions. Experimental results for a 267-mm (JO .5 -in) 8-pad thrust bearing indicates that while a babbitt location on the trailing edge of a pad is often the hottest, the 75/75 percent location provides temperature data on the high-pressure region of the pad. Babbitt temperatures also provide a convenient indicator of the transition from laminar to turbulent flow in the oil film.

Multi-piston swash plate type compressor with internal lubricating arrangement

Abstract: A multi-piston swash plate type compressor with an internal lubricating arrangement for an air-conditioning system used in a vehicle such as an automobile including a cylinder block body having a swash plate chamber formed therein receiving a swash plate, cylinder bores formed therein for receiving pistons, and a central axial bore formed therein for receiving a driving shaft, the driving shaft being rotatably supported in the axial bore by radial bearings provided therein and by thrust bearings provided around the shaft at the sides of the swash plate. The compressor has suction and discharge chambers communicated with the cylinder bores through reed valves. The swash plate chamber is fed with a refrigerant inclusive of a lubricating oil from the air-conditioning system, and the refrigerant is then fed to the suction chamber through the axial bore. The thrust bearings have a race element surrounding the shaft, a clearance between the race element and the shaft being locally widened for increasing a flow rate of the refrigerant to be introduced into the axial bore through the thrust bearings.

Composite thrust bearing formed by a radial bearing with at least one separate axial thrust collar

Abstract: A composite thrust collar for a rotary shaft formed from a radial bearing in which the rotating shaft may rotate and at least one axial thrust collar preventing axial movement of the shaft, characterized in that the radial bearing or the axial thrust collar or collars has at least one boss and in that the radial bearing is fixed to the axial thrust collar or collars by welding along said at least one boss and in that said at least one boss interconnects with the radial bearing or axial thrust collar in such a manner that should the weld break the bearing and collar can not rotate nor be radially disposed relative to one another.

Rotation preventing device for an orbiting member of a fluid displacement apparatus

Abstract: A rotation preventing/thrust bearing device for a scroll type fluid displacement apparatus is disclosed. The rotation preventing/thrust bearing device includes a fixed portion, an orbital portion and balls. The fixed and orbital portions each include an annular race and a ring which covers the end surface of the race. Both rings have a plurality of holes or pockets in an axial direction. The balls are placed between the facing holes in the ring, and are in contact with both races to carry the thrust load from the orbiting scroll member. All balls are rotatably held on a retainer which is disposed in an axial clearance between the facing rings.

Unitized bearing with free molded seals

Abstract: A thrust bearing for use in a steerable McPherson strut suspension uses free molded seals, but is sealed at all times regardless of the axial forces acting on the bearing, and is maintained as a unitized structure as well. Retention flanges on the cage interfit with conical sealing surfaces of the races to limit axial race separation and unitize the bearing. Free molded seals with conical walls matching the respective sealing surfaces are maintained in a radial tension against the sealing surfaces by virtue of being supported on the cage and on the sealing surfaces with a stretch fit. The sealing walls are prevented from disengaging the sealing surfaces by the controlled race axial separation, and the tension of the sealing engagement actually increases because of the orientation of the sealing walls and sealing surfaces.

Scroll type compressor with spiral oil feeding grooves in thrust bearing

Abstract: An improved scroll type compressor which is provided with a thrust bearing of high operational reliability, wherein the thrust bearing has a plurality of oil-feeding grooves in the spiral form formed in the surface part of the bearing so as to prevent it from seizure or wear.

Bearing associated with means for determining rotational speed

Abstract: A thrust bearing contructed to comprise a pair of disc elements one of which is arranged to rotate and the other of which is kept stationary, the surface of the rotating side opposing the stationary element being provided with a pattern of spiral grooves which are non-reflective while the remaining lands of the pattern are reflective so that a pulsed light beam is reflected from the pattern when a light beam is directed onto the rotating pattern through a hole provided in the stationary element, the reflected light pulses being utilized for determining the rotational speed of the element under rotation.

Device for removing and fitting rolling-contact bearings

Abstract: A device for removing and fitting rolling-contact bearings, in particular wheel bearings in motor vehicles, is characterised by a screw bolt 30 with a screw head 31 at one end and with a screwed-on hollow nut 32 at the other end, and also with two thrust washers 33, 34, pushed onto the screw bolt 30 between screw head 31 and nut 32, and a thrust sleeve 35, the inside diameter of which is greater than the outside diameter of the thrust washer 34 bearing against the nut 32 and which is centred at the outer marginal area of the thrust washer 33 bearing against the screw head 31. In particular wheel bearings of motor vehicles can be removed and fitted with this device without it being necessary to remove the bearing housing 1 accommodating the wheel bearing 3 from the motor vehicle.

Helical planetary gear assembly

Abstract: A helical planetary gear assembly includes a ball bearing secured to a housing, a carrier sleeve coupled with an inner race of the ball bearing and being axially restrained by engagement therewith, an input shaft supported by the ball bearing through the carrier sleeve, an output shaft arranged coaxially with the input shaft for rotation relative thereto, a sun gear secured to the input shaft for rotation therewith, a ring gear secured to an internal wall of the housing, a planet carrier arranged between the sun and ring gears, and a plurality of planet gears rotatably supported by the planet carrier and being in meshing engagement with the sun and ring gears, the gears each being in the form of a helical gear. The planet carrier includes a body member secured to the carrier sleeve for rotation therewith, and the input shaft is axially restrained by opposite ends of the carrier sleeve through a pair of axially spaced thrust bearings.

Viscous agent extruder

Abstract: PURPOSE:To easily allow a nozzle direction and a working direction to coincide with each other, in a viscous agent extruder equipped with a holder for holding a cartridge with a nozzle and an extrusion rod, by making the plunger at the leading end of the extruder and/or the support at the leading end of the holder freely rotatable. CONSTITUTION:An extrusion rod is driven by a first rack body 31 and a second rack body both of which have racks. A plunger 33 is mounted to the leading end of the first rack body 31 through a thrust bearing 90 in a state contacted with the bottom lid 12 of a cartridge and made freely rotatable with respect to the first rack body 31. Therefore, the friction coefficient with the bottom lid 12 becomes small and a radius comes to the radius r2 of the ball part of the bearing 90 and becomes smaller than the radius r1 of each of the plunger 33 and the bottom lid 12 and the cartridge can be lightly rotated. A thrust bearing is also provided between the leading end surface of the cartridge and the cover being the front end support wall of the holder and friction coefficient is reduced at this part.

Bearing housing, especially for a unilaterally and axially braced external-rotor motor

Abstract: In order to assure in a simple manner and with the smallest axial mounting space, a low-noise bearing support having little radial unbalance, two axial ball bearings (2, 3) are provided with a firm fit relative to the rotor shaft (1) and mutually braced axially by an interposed spring washer. Advantageously, ball bearing (3) next to the open end face of the bearing hole is designed as a stationary bearing with a press lift between its inner ring (31) and the rotor shaft (1) as well as between its outer ring (32) and the bearing hole.

Running stabilizing device in automobile

Abstract: PURPOSE:To enhance the control ability and stability of a differential motion limiting device which is disposed between a pair of side gears coupled to a drive shaft and a differential gear unit through the intermediary of friction clutches, respectively, by enabling the differential motion limiting device to variably control the limitation of differential motion CONSTITUTION:A differential limiting device moves a pressure plate 9 to left and right through a lever 20 and a thrust bearing 21 is association with the movement of a piston rod 18 in an air cylinder 17 Further, friction torque between the left and right side gears and a differential gear casing 2 is changed by means of a friction clutch 7 to limit differential motion The supply and discharge of air to and from the air cylinder 17 is controlled by a control valve 15 which is in turn controlled by a controller 14 In this arrangement the controller 14 controls the valve 15 such that the friction troque is increased in association with an increase in vehicle speed detected by a vehicle sensor 12 and an increase in steering angle detected by a steering sensor 11

Some design problems of scroll compressor

Abstract: The design problems of scroll compressors are discussed in this paper. The critical machine element in a scroll compressor is the thrust bearing when the compressor is employed for air conditioning and refrigeration, over a long period of operation. Not only the thrust, but also the moment acts on the thrust bearing. The theory of Rumbarger is applied to describe the load condition of the thrust bearing. How to optimize the geometric shape of the spiral elements is also of prime interest to the designers. We explain in this paper how the spiral geometry can be optimized when the stability condition, weight, thrust, and outer diameter of the orbiting scroll are taken into account. This optimum design would minimize the overturning moment of an orbiting scroll when the outer diameter of the thrust bearing is predetermined.

Anti-shuttle pump

Abstract: A sealing arrangement is herein disclosed for use in a high energy centrifugal pump and the like wherein a chamber is defined about the discharge portion of the pump wheel which is attached to a shaft to form a rotor which rotates with respect to stationary parts and has limited axial movement as determined by the thrust bearing clearance. An annular seal is disposed operatively about the outside diameter of the pump wheel with sufficient clearance for the pump wheel to clear the seal regardless of the extent of the axial movement of the wheel. The seal acts to retard the shock waves of transient pressure differentials developed across the wheel. the seal further operates to define a dashpot arrangement wherein the wheel comprises a piston which automatically equalizes any pressure differential developed across the wheel and by-passing the seal.

Rotary barrel machine with pistons and fixed centering pivot

Abstract: The invention relates to a pump with a barrel and an oscillating plate having a fixed central pivot. The pivot is solidary with two half-shafts which may be axially prstressed. The invention creates a balanced floating thrust bearing for the pivot bearing.

Antifriction thrust bearing for orbital motion

Abstract: A thrust bearing for use between two parallel plates in relative orbital motion. The bearing includes a plurality of rollers disposed between the plates. Each roller comprises two opposing cones joined at their base with one cone in rolling line contact with one plate and the other cone in rolling line contact with the other plate. As one plate orbits relative to the other, each rolling line contact sweeps a circular area on its respective plate.

Oil-free scroll type fluid machinery

Abstract: PURPOSE:To remove a slidable part by supporting the thrust load by a pin crank equipped with thrust bearings having a radial bearing which are arranged between the back surface of the edge plate of a turning scroll and a casing and keeping the gap between the both scroll edge plates constant, in the turning scroll. CONSTITUTION:When operation is started, a turning scroll 106 supports the thrust load by with collar having thrust bearings 110 having a radial bearing which are arranged at several positions between the back surface of the edge plate 106a and a casing 102. Therefore, turning movement is performed, keeping a certain gap (c) between the edge plate 106a and the undersurface of a fixed scroll 101. Therefore, the inside of the casing 102 is formed into the vacuum range equal to a suction chamber 101a. Since, in this case, bearings 103, 107, and 110 are sealed by the grease having a low vapor pressure, outside leakage is prevented, and the communication of the above-described vacuum range to the atmospheric-pressure side through a shaft part is cut-off by the bearing apparatus 111. With such constitution, the slidable part between the both scrolls can be removed, and the sealing performance can be improved markedly.