Showing papers on "Bearing (mechanical) published in 1975"

Bearing capacity analysis of reinforced earth slabs

Abstract: Laboratory data from some 65 small scale strip footing bearing capacity tests were used as a basis to develop an analytical procedure of predicting the load-settlement and ultimate bearing capacity of a strip footing on sand which contains horizontal strips of tensile reinforcing. The theory is formulated in terms of the ratio of bearing capacity with and without reinforcing, assuming that existing methods are adequate for predicting bearing capacities on sand with 0 reinforcing. A working hypothesis is suggested involving a particular failure mode suggested from the tests. The dimensions, strength, and frictional properties of the sand and reinforcing are incorporated directly with this assumed failure mode to give a direct solution to the bearing capacity. An example calculation is included along with an approximate comparative cost analysis.

Adjusting process for bearings

Abstract: A shaft is confined within a housing by two indirectly mounted tapered roller bearings, and these bearings are adjusted by applying opposed axial forces to their cups, the spacing between which is dependent on the thickness of a deformable spacer located within the housing. A force of sufficient magnitude is applied to plastically deform the spacer that is between the two cups, and as the force is applied the spacing between the raceways of the two cups is monitored. The force is released when the size of the spacer will cause the cup raceways to be spaced apart a distance which provides the bearings with the correct adjustment. This distance is determined by measuring a master cup and adjusting the dimension so derived for the desired amount of end play or preload and for spring back of the spacer, hub and cups when the load is released. The process may be used where the cones are press-fitted over the shaft and have their front faces abutting. In that case, further adjustments from the raceway spacing of the master may be made to accommodate changes in the positioning of the cone raceways which result from variations in the cone bore diameters and in the locations of the cone front faces. The measurement of the cone bore diameters and front face locations are made in a fixture and compared with measurements derived from master cones which are also measured in the fixture, all for the purpose of determining deviations from the master cones. Where an integral double cup is used (no spacer) the measuring procedure is useful for selective assembly of cups and cones into bearing assemblies, with the three components being selected such that they result in a bearing having the correct adjustment.

Vertical type antifriction bearing device

Abstract: A vertical type antifriction bearing device which includes an antifriction bearing using balls or rollers as rolling members. This bearing device features that, during operation, the level of lubricating oil is maintained below the antifriction bearing allowing the feed of lubricating oil to the antifriction bearing in a suitable amount, and that during the stoppage of operation, the level of the lubricating oil is raised above the antifriction bearing, whereby during the stoppage of operation the antifriction bearing is shielded from atmosphere or moisture to prevent the corrosion thereof and, during the operation, the agitation loss caused by the lubricating oil is minimized.

Torque rejection soft mounted platform

Abstract: A system for stabilizing sensitive apparatus from translational and rotational vibrations of the structure on which the apparatus is mounted uses a conventional bearing or a flexure pivot to achieve angular isolation in series with a compliant isolator for attenuating translational vibrations. Wideband corrective torques are applied to the apparatus by linear actuators connected between the vibrating structure and the sensitive apparatus, in parallel with the isolator and bearing combination. Motion of the apparatus is sensed by rate gyros and angular accelerometers mounted on the sensitive apparatus. These instruments through servomechanism loops, drive the linear actuators to oppose the motions.

Linear motion bearing block

Abstract: At least two linear motion bearings are mounted coaxially within a housing for relative movement with respect to a shaft located in the bore of the bearings. Preferably, the bearings are of the recirculating ball type and may be self-aligning or non-self-aligning. Seals are provided to cooperate with the bearings and housing to form an enlarged lubricant reservoir between the bearings when externally lubricated bearings are utilized, and means are provided for preloading the bearings.

Integrated high capacity compressor

Abstract: A compressor motor has a flywheel connected directly to a motor shaft which drives two opposed pistons that are simultaneously compressed so that the bearing loads are balanced. A double inlet blower is connected to said shaft and has one inlet for drawing cooling air through a crankcase for cooling the connecting rod bearings. A second inlet draws air through a vent formed in a shroud member. The blower discharges the air from both inlets into the shroud member which then directs the air to the cylinder sleeves and heads for cooling purposes. The cylinder, piston skirts and piston rings are self-lubricated by containing a fluorocarbon thereby substantially reducing the heat generating friction between said members.

Bearing with axial fit-up ring

Abstract: The bearing has an inner race member and an outer race member. At least one of the race members has two axially separated races. Rolling members are provided in the annular space between the two race members. A permanently plastically deformed means such as a permanently plastically deformed ring separates the facing ends of the axially separated races, and provides a proper axial fit-up. To assemble the bearing the axially separated bearing races, the deformable ring between them and the rolling members such as balls are placed within an outer race member. A force is then applied against each of the axially separated races to permanently deform the ring. The ring is permanently deformed in a manner to provide a proper axial fit-up of the bearing components.

Toner for developing electrostatic latent images

Abstract: The present invention relates to a method of fixing a toner image onto a paper bearing said image with the use of a particular toner containing a colorant and a resin wherein the resin contains at least one particular type of polymer which has a Mw/Mn ratio of about 3.5 to 40 wherein the Mn value is between about 2,000 and 30,000.

Low-friction fabric bearing

Abstract: The invention contemplates a fabric-lined bearing wherein the fabric is of knitted construction, from yarn consisting primarily of low-friction filaments and high-strength filaments, and wherein the exposed filaments at the bearing interface are primarily oriented to be generally transverse to the predominant direction of intended motion under load at the bearing interface.

Hydraulic bearing mounting press

Abstract: Two opposing hydraulic rams simultaneously drive bearings onto bearing seats at opposite ends of an axle assembly on which wheels inside the bearing seats are already in place. Wheel support dollies initially position and support the wheel and axle assembly between the opposing rams. The rams are adjusted vertically to opposed positions concentric with the axle. As the rams act upon the bearings, the axle and its supporting dollies can move axially off its center position if greater resistance is encountered in mounting one bearing than in mounting the other. Sensing means mounted on the wheel support dollies monitor the movement of the axle and stop the flow of driving fluid to the ram which has pushed the axle off center until the opposite ram recenters the axle.

Rotary rock bit with cone mouth air screen

Abstract: Drill cuttings in the borehole are prevented from entering the area between the bearing pin and the cone cutter of a rotary rock bit by a cone mouth air screen. The cone cutter includes an internal cavity and a cone mouth positioned over the bearing pin. Bearings are located within the internal cavity between the bearing pin and the cone cutter. A passage extends through the bit body and the bearing pin for conducting a gaseous drilling fluid to the internal cavity for cooling the bearings. A screen means is positioned in the cone mouth between the cone cutter and the bearing pin for preventing solids in the borehole from entering the internal cavity and for allowing the circulating gaseous drilling fluid to pass from the internal cavity into the borehole.

Flexible bearing having low torque resistance

Abstract: A flexible bearing is constructed of layers of elastomer and rigid material, alternately stacked and bonded together. The central portion of each elastomeric layer, however, is an elastomeric material having a lower elastic shear modulus than that of the edge portions. This lowers the resistance of the bearing to forces exerted on it in directions parallel to the layers of elastomer and rigid material.

Sealing system for a rotary rock bit

Abstract: A sealing system for a rotary rock bit acts as a barrier to the pulverized cuttings and other materials in the borehole and prevents the materials from entering the bearing area through the cone mouth opening of the cone cutter. The bearing rollers are substantially captured in a groove machined into the cone cutter. This allows a seal unit to be located at a substantial distance from the hostile drilling environment and increases seal life. The shirttail portion of the bit body and the base of the cone cutter cooperate to retard materials in the borehole from contacting the seal unit. The sealing system is provided without reducing the bearing capacity of the bit's bearing system.

Bearing housing assembly method for high speed rotating shafts

Abstract: A bearing housing for high speed rotating shafts wherein the bearing housing is constructed in two parts with the bearing being of the semi-floating type. One part of the bearing housing presses against the bearing to resist any axial thrust that may be exerted on the bearing during high speed operation. The bearing is floating on a lubricant around its outer diameter in the other portion of the two part bearing housing. With the bearing being stationary in the housing, the only critical surface becomes the internal surface between the bearing and the shaft itself. By varying the position of the two parts of the bearing housing, the passage for the lubricant to enter the bearing housing can be located at a near vertical position while permitting desired orientation of the end of the bearing housing.

Gravure-type adhesive applicator

Abstract: An adhesive applicator of the gravure-type is provided for continuously applying spots of adhesive onto a travelling web with the use of a roller of the intaglio type. A filling device having a spring loaded shoe element bearing against the roller fills the cavities of the roller with adhesive under pressure from a closed adhesive reservoir. The web is moved by a pin wheel disposed adjacent the roller, and spots of adhesive from the filled cavities are continuously applied to the web as it is intermittently forced to track the applicator roller by means of spaced pads provided on the wheel.

Design and application of squeeze film dampers for turbomachinery stabilization

Abstract: The steady-state transient response of the squeeze film damper bearing was investigated. Both the steady-state and transient equations for the hydrodynamic bearing forces are derived; the steady-state equations were used to determine the damper equivalent stiffness and damping coefficients. These coefficients are used to find the damper configuration which will provide the optimum support characteristics based on a stability analysis of the rotor-bearing system. The effects of end seals and cavitated fluid film are included. The transient analysis of rotor-bearing systems was conducted by coupling the damping and rotor equations and integrating forward in time. The effects of unbalance, cavitation, and retainer springs are included. Methods of determining the stability of a rotor-bearing system under the influence of aerodynamic forces and internal shaft friction are discussed.

Continuous casting plant

Abstract: Continuous casting plant rollers or rolls of small diameter are provided great longitudinal extension, which longitudinal extension exceeds the width of the continuously cast strand. The rollers or rolls have annular recesses distributed over their longitudinal extension, thus forming substantially cylindrical bearing pins to be received in bearings, preferably slide bearings, whose bearing height, measured from the bearing center toward the strand skin, is smaller than the radius of the rollers or rolls. The rollers or rolls may advantageously be composed of a plurality of individual roller or roll bodies held together by at least one bracing anchor. Preferably, the rollers or rolls are provided with internal cooling.

Rotary valve seal assembly

Abstract: A seal assembly for a rotary valved internal combustion engine is disclosed. The seal assembly comprises longitudinal side seals for axially sealing an interface between a cylindrical valve housing and a complementary valve rotor body therein. Circumferential ring seals are spaced apart along the valve rotor body for isolating inlet or exhaust ports which extend diametrically through the rotor. The ring seals are provided with a novel means for biasing the seals against the rotor. Spacers are provided for locating and retaining the seals in position within the housing, with bearing rings between the spacers for rotationally supporting the rotor. The assembly also includes means for locating the spacers properly in a head of the engine and for properly orienting the end seals.

Magnetic bearing system

Abstract: A single magnetic, radial bearing having a disc with an axis coincident with the bearing or shaft axis, the bearing passively supporting an annulus which forms a radial gap between its inner circumferential edge and the circumferential edge of the disc. The disc has a relatively large diameter compared to its length along the axis.

Bearing arrangement for a vehicle wheel

Abstract: A bearing arrangement for a vehicle wheel, particularly of an automobile, has an outer component provided with a bore and an inner axle component journalled in the bore and supported therein by means of a bearing. One of the components is connected to a wheel for the vehicle and the other component is connected to wheel guiding elements articulated on the vehicle body. The exterior surfaces of the components in the vicinity of the bore define a gap between them extending in toward the bearing. A bearing-protecting packing arrangement at the entrance of the gap includes an annular groove, concentric with the bore, defined on the surface on the outer component in the vicinity of the bore and leading widthwise in toward the bore and a complementary annular ring fixed on the surface of the axle component in the vicinity of the bore. The annular ring cooperates with and projects into the groove so as to substantially prevent foreign elements from entering the gap and contaminating the bearing in the bore.

Sleeve type flanged bearing

Abstract: A split multipiece flanged journal bearing for use as an engine crankshaft thrust-journal bearing or the like wherein the thrust flanges and journal bearing shells are semi-cylindrical and have interlocking means to prevent rotational motion of the thrust flange relative to the respective bearing shell and with potential replacement interchangeability so that any worn or damaged parts may be replaced without changing the whole bearing and so that any one or all thrust flanges may be replaced without removing the crankshaft from the engine and wherein the notch and interlocking lug at one end of a particular combination of thrust flange and bearing shell is of greater arc length than those at the other end to provide a fail-safe feature to assure correct assembly.

Apparatus for shock mounting of piston rods in internal combustion engines and the like

Abstract: An engine is disclosed having at least one piston in operative connection with a crankshaft. A bearing member which defines an elongated, curved bearing surface, is pivotally attached at one end to an eccentrically-mounted member on the crankshaft. The bearing surface of the bearing member is positioned to be intermittently in power-transmitting, sliding relationship with a connection to the piston such as a piston rod. The bearing member is adapted to be rotatable about said pivotal attachment, for transverse displacement by the piston rod relative to the crankshaft, to absorb any shock generated against the piston and the crankshaft, such as by "engine knock." The bearing member is also adapted to return to its pre-displacement position after absorbing the shock.

Fatigue Life of High-Speed Ball Bearings With Silicon Nitride Balls

Abstract: Hot-pressed silicon nitride was evaluated as a rolling-element bearing material. The five-ball fatigue tester was used to test 12.7-mm- diameter silicon nitride balls at maximum Hertz stresses ranging from 4.27 x 10 to the 9th power n/sq m to 6.21 x 10 to the 9th power n/sq m at a race temperature of 328K. The fatigue life of NC-132 hot-pressed silicon nitride was found to be equal to typical bearing steels and much greater than other ceramic or cermet materials at the same stress levels. A digital computer program was used to predict the fatigue life of 120-mm- bore angular-contact ball bearings containing either steel or silicon nitride balls. The analysis indicates that there is no improvement in the lives of bearings of the same geometry operating at DN values from 2 to 4 million where silicon nitride balls are used in place of steel balls.

Design of a Squeeze-Film Damper for a Multi-Mass Flexible Rotor

Abstract: A single mass flexible rotor analysis was used to optimize the stiffness and damping of a flexible support for a symmetric five-mass rotor. The flexible support attenuates the rotor motions and forces transmitted to the support bearings when the rotor operates through and above its first bending critical speed. An oil squeeze-film damper was designed based on short bearing lubrication theory. The damper design was verified by an unbalance response computer program. Rotor amplitudes were reduced by a factor of 16 and loads reduced by a factor of 36 compared with the same rotor on rigid bearing supports.

Higher order finite element methods for the solution of compressible porous bearing problems

Abstract: Finite element methods are used to solve hydrodynamic lubrication problems involving compressible lubricants and porous bearing solids. The particular calculation scheme permits solution at high compressibility numbers (Λ > 100) to be obtained without any numerical difficulty. Finite element and finite difference results for the porous, gas lubricated journal bearing are presented and compared.