Abstract: A cylindrical roller bearing comprises an inner race, an outer race, a plurality of cylindrical rollers disposed between the inner race and the outer race, and a cage disposed between the inner race and the outer race and provided with pocket portions in which the plurality of cylindrical rollers are respectively accommodated. The cylindrical roller bearing satisfies a following relations 1.5×10−3D≦H≦9.0×10−3D and A/B=0.6˜1.

Abstract: At least the center portion of the contour of a rolling surface of each roller along the direction of an axis is linearly shaped in parallel with the axis, and each of the inclinations of the surface on a pillar side of a pocket of a cage for receiving rollers with respect to the circumferential and radial directions is set to be equal to or less than {fraction (1.5/1000)} as large as the length of the roller.

Abstract: An angular bearing of a dual cavity toroidal type continuously variable transmission, includes: a torque input shaft having a shaft-side raceway groove formed in an outer peripheral surface of a flange portion provided in an end thereof; a loading cam unit of a loading cam unit having a disc-side raceway groove formed in an inner peripheral surface of a jointing opening thereof, the loading cam unit located around the end of the torque input shaft; and a plurality of balls held between the shaft-side raceway groove and the disc-side raceway groove to bear thrust loads exerted on the cam disc, wherein each of an angular contact angle between the balls and the shaft-side raceway groove and an angular contact angle between the balls and the disc-side raceway groove is 60° or smaller, and each of a curvature radius of a groove surface of the shaft-side raceway groove and that of a groove surface of the disc-side raceway groove is from 52% to 55% of a diameter of the ball.

Abstract: A ball bearing has an outer race, an inner race and a plurality of balls disposed between the races. The balls are spaced on a pitch diameter to provide a rolling medium between the races to accommodate differential rotation between the races. The ball spacing is maintained by a separator having a pocket for each ball. The pockets are distributed around the pitch diameter in a random manner to reduce vibratory impulses which might be imposed by the surfaces of the races.

Abstract: A roller bearing of the type incorporating an outer and an inner race ring (1, 3) having confronting race tracks (2, 4), with lands (A, B) situated axially outside said race tracks and a number of rollers (5) being interposed between and in contact with said race tracks, said rollers (5) and race tracks (2, 4) having longitudinal section profiles of a radious of curvature, which is bigger than the distance between the outer race track and the axis of the bearing, as measured perpendicularly to the race track, which rollers (5) thereby are axially movable along the race tracks without being hindred by axial limitations at the race tracks, in order to allow relative misalignment and axial displaceability of the race tracks, wherein at least portions of the areas (A, B, G, J) of the race rings axially outside the zone (H) subjected to bearing load, have such surface finish and/or profile as to contribute in giving the rollers (5) a positive skew angle.

Abstract: A muddy-water-proofed vehicle wheel supporting structure for mounting a wheel through a double-row tapered roller bearing on an end of an axle comprises a seal member interposed between a shoulder of the axle and a part constituting a sealing device, for example, a seal slinger, fitted to one of a pair of inner rings of the bearing that is brought into contact with the shoulder.

Abstract: An improved single-row multi-point-contact ball bearing for an electromagnetic clutch and pulley and for a compressor for an automobile air conditioner is provided, which has a low relative inclination between the inner and outer rings and rotatable at a high revolution of about 10,000 rpm, and yet inexpensive requiring a small axial space.A single-row four-point contact angular ball bearing is provided which comprises an one-piece inner and outer rings. Each raceway surface of the inner and outer rings is made to form a Gothic-arched configuration having two curved surfaces, and each radius of curvature of the two curved surfaces is made to range substantially 0.515 to 0.55 of the outer diameter of a ball.

Abstract: A rolling bearing satisfies at least one of following requirements(1)-(4). (1) The radius r.sub.c of curvature at the joint between the head portion and the chamfered portion of said rolling element shall be not less than 0.2 mm. (2) The roughness (.sigma..sub.1.sup.2 +.sigma..sub.2.sup.2)1/2 resulting from the central line average roughness .sigma..sub.1 of the head portion of said rolling element and the central line average roughness .sigma..sub.2 of the main collar surface of the bearing ring shall be not more than 0.3 .mu.mRa. (3) The dimension y.sub.c of the chamfered portion lying between the head portion and the rolling surface of said rolling element in the direction along the diameter of said rolling element shall be not less than the height y.sub.k of the border line in the relief groove on the main collar surface of the bearing ring from the surface of the track. (4) The radius r.sub.

Abstract: A change bearing for rollers includes a mounting ring and a roller bearing set into the mounting ring. The mounting ring has a bore and an outside radial surface, and the roller bearing includes an inside ring, an outside ring and a plurality of cylinder-shaped pin rollers positioned between the inside ring and the outside ring. The pin rollers have a radius of curvature whose center is located diametrically across from the bearing axis. The inside ring is located at a predetermined position in relation to the outside radial surface of the mounting ring and the outside ring is positioned in the bore of the mounting ring at a position that is based on component tolerances and desired bearing play.

Abstract: A deep-raceway ball bearing 1 as a ball bearing includes an inner ring 2, an outer ring 3 and a rolling element 4. The inner ring 2 is annular as a whole and circular in cross section. A rotary shaft 5 is fastened to the inner peripheral surface of the inner ring 2. The outer ring 3 is annular as a whole and circular in cross section, and larger in inside diameter than the inner ring 2. A plural number of rolling elements 4 are disposed in reliable fashion between the inner ring 2 and the outer ring 3, while being in contact with the outer peripheral surface 6 of the inner ring 2 and the inner peripheral surface 7 of the outer ring 3. The outer peripheral surface 6 of the inner ring 2, while extending in the circumferential direction thereof, is curved inward to form an inner raceway 8 circular in cross section. The inner peripheral surface 7 of the outer ring 3, while extending in the circumferential direction thereof, is also curved inward to form an outer raceway 9 circular in cross section.

Abstract: A rolling bearing comprises an outer race member, an inner race member concentrically arranged therewith, rolling elements disposed therebetween, and a shield plate attached to a side end of an inner periphery of the outer race member by being caulked or latched. The shield plate is provided with a curled portion which curls outwardly in the axial direction at a stepped portion of a groove formed at a side end of the outer race member, and the shield plate is formed with slits extended toward an outer periphery of the shield plate from portions which are not located at and over the bottom of the curled portion, the number of the slits being more than (nZ.+-.X) inclusive of (nZ.+-.X), where n is a positive integer, Z is the number of balls and X is an integer more than 1.

Abstract: A release bearing (1) for actuating a gearshift clutch of an automotive vehicle comprises an angular contact ball bearing (3) in which forces are transmitted from one bearing raceway to another bearing raceway at an angle of pressure .alpha. to the transverse plane of the angular contact ball bearing (3). To improve the bearing capacity of such a release bearing (1), the angle of pressure .alpha. is configured to be .gtoreq.36.degree. and <45.degree.. Friction between the balls and the raceways of the angular contact ball bearing is reduced by the fact that an osculation K.sub.AU on the outer ring (6) is .gtoreq.1.15 and an osculation K.sub.IR on the inner ring (10) is .gtoreq.1.07.

Abstract: A roller thrust bearing having an increased efficiency and a reduced operating noise level includes a plurality of cylindrical roller elements radially oriented within a circular bearing cage which has inner and outer cage diameters and upper and lower cage surfaces. The roller elements protrude above and below the upper and lower cage surfaces, respectively, and upper and lower circular races having inner and outer diameters, are in rolling contact with the portions of the roller elements protruding above and below the upper and lower cage surfaces. The upper and lower races have features for reducing roller skidding against the races and for reducing operating noise of the thrust bearing. Another race feature allows the load carrying capacity of the bearing to vary to be proportional to the imposed load.

Abstract: A tapered roller bearing has inner and outer races and tapered rollers organized in at least two rows, with the rollers of the one row being generally aligned with the rollers in the other row. The large ends of the rollers are presented toward each other so that the forces which urge the rollers of either row up their tapered raceways are resisted by the rollers of the other row. The end faces of the aligned rollers in the two rows contact each other or else contact intervening elements such as cylindrical rollers or a separating disks. The geometry of the rollers and the raceways along which they roll are such that, when one race rotates relative to the other race, pure rolling contact exists between the side faces of the rollers and the raceways and pure rolling contact also exists at the end faces of the rollers. Moreover, the lines of contact for the aligned rollers of any set are synchronized and the rollers are stable.

Abstract: In the angular contact ball bearing, the respective conditions of the inner race dimensions are designed most suitably to prevent the shoulder portion of the inner race from being opened outwardly, thereby being able to prevent a slipping phenomenon from occurring between the inner race and shaft.

Abstract: With the size precision suitable for mass production, the time and labor required for running-in of various rotating machine and apparatus such as a gear box with the bearing installed are reduced.A clearance 13 exists between the end face on the larger diameter side and the inner face 7a of the larger flange portion 7 in the state where the end face on the smaller diameter side of the tapered rollers 3 is abutted to the inner face 6a of the smaller flange portion 6. The minimum value of the size .DELTA.L of the clearance 13 is kept up to 0.3 mm. Simultaneously, the difference between the maximum value and the minimum value in the length L of the tapered rollers 3 is kept up to 0.15 mm.

Abstract: Three rows of ball rolling grooves 23A to 23C are formed in each side of a guide rail 21, while being vertically arrayed. Three rows of ball rolling grooves 25A to 25C are also formed on the inner surface of each of the legs of a slider 22. The ball rolling grooves 25A to 25C are respectively disposed in opposition to the ball rolling grooves 23A to 23C to thereby form ball sliding passages 26A to 26C. In either of the upper or lower ball rolling passage 26A or 26C, each ball contacts, at four points, with the surfaces of the ball rolling groove 23A or 23C of the guide rail 21 and the ball rolling groove 25A or 25C of the slider 22. In the remaining ball rolling passages, each ball contacts at two points with the surfaces of the ball rolling grooves. One of lines L1 and L4, each of which connects two opposite contact points of those four ones in the upper or lower ball rolling passage is oriented in the same direction as of lines L2 and L3 connecting the contact points in the remaining ball rolling passages.

Abstract: The invention relates to machine engineering and, more particularly, to roller bearings. The roller bearing has an outer ring with a cylindrical raceway and protrusion-free inner surface. An inner ring has a pair of unitary beads, or sides that extend inwardly toward the outer ring. A separator is mounted in an annular space between the inner ring and the outer ring. One of the embodiments provides for the use of one or more additional removable ring beads fitted in the raceway of the outer ring. The removable ring beads can have a rectangular or trapezoidal cross section.

Abstract: A rolling bearing unit having undulation on the rolling surfaces of the rolling elements where the total value of the wave components having an even number of waves per circumference is smaller than the total value of the wave components having an odd number of waves per circumference, or having undulation on the inner ring raceway and outer ring raceway, where the undulation on at least one of the raceway is conditioned such that the maximum waviness amplitude among (nZ), (nZ+1) and (nZ -1) waves per circumference is smaller than the maximum waviness amplitude among (nZ+2) and more waves per circumference, where n is a positive integer and Z is the number of rolling elements, thereby making it possible to obtain a low-cost, high-performance rolling bearing in which the vibration characteristics of the rolling bearing are improved without having to increase the precision required for manufacturing the rolling elements and inner ring raceway and outer ring raceways.

Abstract: A running wheel is slidably supported on a stationary axle between the axle and the bearing bore with a large bearing play and a small Hertzian stress. The axle has a circumferential section which is defined by its sector with a sector angle of less than 180.degree., wherein its radius of curvature is substantially equal to the radius of curvature of the inner wall of the bearing bore. In accordance with the desired bearing play, the radius of curvature of the remaining circumferential section of the axle is smaller than the radius of curvature of the bearing bore. The direction of the main stress acting upon the running wheel lies in the section of the central plane of the axle sector with the larger radius.

Abstract: An improved porous bearing and a motor which is provided with the porous bearing in which the friction losses and reflection of shaft are reduced, noises caused by the vibrations are avoided with low cogging or low jitter, and in addition, the manufacturing process is simplified to obtain long-life products at low cost. The number (C) of grooves of the porous bearing meets at least one of the following equations:nA+mB-C.noteq.0, nA-C.noteq.0 and mB-C.noteq.0wherein A is the number of magnetic poles of the motor magnet, B is the number of the slots of the armature, and n and m are integers, respectively.

Abstract: In order to reduce the sound pressure levels of abnormal sound called "squeal" and the sound of the cage that are produced during the operation of radial rolling bearings, the radial rolling bearing according to the present invention satisfies the following relations: 1.5.times.10.sup.-3 D.ltoreq.H.ltoreq.9.0.times.10.sup.-3 D and A/B=0.6-1.0, where D=diameter of the outer peripheral surface of cage 5a; H=thickness of annular gap 9 between the inner peripheral surface of flange 10 formed at an end portion of outer race 2a and the mating outer peripheral surface of the cage 5a; A=axial length of the outer peripheral surface of an end portion of the cage 5a; B=axial length of the mating inner peripheral surface of the flange 10.

Abstract: The invention provides a roller bearing apparatus including an inner ring member supported for rotation on a sleeve, an outer ring member, rollers in the raceway space defined between the inner and outer ring members, and a guide member having roller seats against which inboard end portions of the rollers are seated. To promote roller precession when the roller bearing apparatus is used in an oscillatory application, the roller seats are slanted or pitched in a circumferential direction and at least the inboard end portions of the rollers are provided with non-planar, and in one embodiment frustoconical, end faces. Cooperation between the non-planar end faces of the rollers and the pitched roller seats controls the mean skew axes of the rollers to promote consistent roller precession through the bearing load zone, and enables increased freedom of movement of the rollers to minimize friction. This increases the life of the roller bearing by reducing roller related failures.

Abstract: A roller bearing for use in a compressor for an air conditioner. Either the rolling elements or the bearing rings of the bearing is formed on their surface with a multitude of independent minute recesses in random directions. The surface is smooth at other portions than the recesses and the recesses have substantially the same size in the axial and circumferential directions.

Abstract: A roller bearing includes an inner raceway member having an inner raceway surface and an outer raceway member having an outer raceway surface. The inner and outer raceway surfaces are spaced apart from one another to define an annular space and a plurality of rolling elements are disposed in the annular space for engaging the inner and outer raceway surfaces as the rolling elements roll in a rolling direction. During operation of the roller bearing, friction forces arise at regions of the inner and outer raceway surfaces that give rise to positive skew moments. Those regions of the raceway surfaces are designed to have greater frictional characteristics than those regions of the inner and outer raceway surfaces where negative skew moment producing friction forces arise. In that way, the skew of the roller can be controlled to be not excessively negative.

Abstract: 1. A ball bearing comprising; a first race ring having a surface formed with a first race surface thereon, a second race ring having a surface formed with a second race surface thereon, and a plurality of balls provided so as to be freely rotatable between the first race surface and the second race surface, the ball bearing being used under conditions wherein a product d.sub.m .multidot.N of a pitch circle diameter d.sub.m mm of the plurality of balls, and a rotational speed N rpm of the second race ring relative to the first race ring is greater than 1,000,000 mm.multidot.rpm, characterized in that for each of the plurality of balls, a ratio .DELTA.I/I of a dynamic imbalance amount to a moment of inertia I, is less than (3.1.times.10.sup.7 /(d.sub.m .multidot.N).sup.2)+2.7.times.10.sup.-5.

Abstract: The surface roughness of the rolling surface 2 of the roller 1 along both the axial and circumferential direction is 0.06 .mu.m RA or less, while the surface roughness of the opposing inner ring raceway 4 is 0.08 to 0.15 .mu.m Ra along the axial direction, and 0.04 or less along the circumferential direction, whereby the heat generated by the roller bearing is kept to a minimum, and the danger of burning of the roller bearing is reduced.

Abstract: A rolling bearing in which the outer diameter of a first rolling element is different from that of a second rolling element. During the operation of the rolling bearing, the speeds of revolution of the first and second rolling elements are different from each other due to a difference in their outer diameter. The circumferential directions in which the first and second rolling elements move within pockets are opposite to each other, so that a cage is prevented from vibrating with respect to the first and second rolling elements.

Abstract: A retainerless self-aligning angular contact antifriction bearing apparatus including an inner race member having a spheroidal inner race surface, an outer race member including a pair of convex outer race surfaces opposing the inner race surface, and a plurality of rollers arranged in axially oppositely inclined rows. Each roller includes a concave longitudinal profile having a radius of curvature greater than the radius of curvature of each of the spheroidal inner race surface and the associated convex outer race surface.

Abstract: A reduced friction bearing, includes an inner track or race, an outer track or race, a roller, and lines of contact provided in each of the inner and outer tracks. The ratio of the diameter of the inner track at the line of contact to the diameter of the roller at the location of each inner track line of contact is approximately equal to the ratio of the diameter of the outer track at the line of contact to the diameter of the roller at the location of each outer track line of contact. Various roller configurations and alignments are disclosed in the several embodiments of the invention.

Abstract: An object of this invention is to provide a rolling bearing in which, as for the rolling elements, it is unnecessary to employ a high level heat treatment such as carburizing or carbonitriding which requires a long period of time to achieve, and which is sufficiently long in service life even when used with a lubricant containing foreign matters. In a rolling bearing, the amount of residual austenite (.gamma..sub.R vol %) in the surface layer of at least one of the inner and outer races is in a range of 25 to 40 vol %, and the surface hardness (Hv) thereof meets the following condition:-4.7.times.(.gamma..sub.R vol %)+900.ltoreq.Hv.ltoreq.-4.7.times.(.gamma..sub.R vol %)+1000and the hardness of the rolling elements combined with the inner and outer races is higher by H.sub.R C 1 to 2 than that of the one of the inner and outer races.

Abstract: In a method of assembling a double-row ball bearing of a preload-type, which includes a step of inserting a plurality of balls in a crescent-shaped gap formed between an outer race and an inner race which is deviated with respect to the outer race, a step of distributing the balls between the outer and inner races at equal intervals, and a step of disposing the outer race and the inner race concentrically with respect to each other, a step of producing a temperature difference is performed before the step of distributing the balls at equal intervals. In the step of producing temperature difference, the outer race is heated by a heating coil surrounding the outer race to expand the outer race.

Abstract: A spindle motor having a housing, a hub member rotatable relative to the housing, a bearing means disposed between the housing and the hub member, a rotor magnet mounted on the hub member, and a stator disposed in a facing relationship with the rotor magnet. The hub member includes a supporting wall portion, which cooperates with the stator to constitute an air seal structure. A magnetic fluid seal means is provided at a position outward of the bearing means, and includes a conductive plate for grounding static electricity. The bearing means is comprised of a radial ball bearing, which includes certain improvement.

Abstract: An antifriction roller bearing, in which two sets of units are arranged so as to face each other in an one-axis direction. Each unit comprises an inner ring, an outer ring and rollers, the inner and outer rings being provided respectively with a raceway track of mono-hyperboloid of revolution about the one axis. The rollers are arranged so as to come into linear contact with the inner and outer raceway tracks and slant to a plane including the one axis at an angle. An energizing means is arranged between both the inner rings or both the outer rings to energize the inner rings or the outer rings so as to narrow down the spacing of the raceway tracks, the outer rings or the inner rings which are not subject to the energizing force being stationary.

Abstract: A roller bearing constructed in accordance with the invention comprises inner and outer rings and rollers therebetween as is known. The rings have no ribs, flanges or grooves but instead axial inner surfaces of the rings provide raceways which are substantially convex and the axial outer surfaces of the rollers are substantially concave to match. These concave and convex surfaces contact one another over contact zones. Each roller has an external surface which is asymmetrical relative to the center of the roller and the geometry is such that during use frictional moments develop at the contact zones between the rollers and the rings to generate a positive skew force on the rollers. This renders the bearing self-tracking.

Abstract: A proportionally dimensioned roller bearing including a pair of co-axial rings with confronting track working surfaces and a plurality of equispaced rollers captivated between the track surfaces wherein each of the rollers has a central portion of a common outside diameter defining a working surface in close adjacent working relation to the working surface of the inner ring and a pair of spaced roller portions of a common outside diameter outboard of the central roller portion of a diameter greater than the diameter of the central portion of the roller and defining spaced working outboard roller surfaces and wherein the rollers and ring tracks are configured for working relation with one another and the central portion outside diameter dimension relative to the inner ring track diameter dimension being equally proportional to the outside diameter dimension of the outboard portions of the rollers relative to the inside track diameter dimension of the outer ring.

Abstract: A plurality of rollers 4 are arranged between the inner and outer races 2 and 3 so that the distances between the rollers can be freely changed without a retainer. Since there is no retainer, any abrasion of the retainer due to the frictions between the rollers and the retainer is not caused, the number of the rollers can be increased, and the carrying capacity can be increased so that the roller hearing with a longer life time can be obtained.

Abstract: A novel method for assembling a two row, angular contact bearing achieves improved axial end play without providing more ball diameter classes. The actual width of the pairs of opposed ball pathways is gauged. When and if the width falls nearly halfway between two available ball diameter classes, one row is chosen from the larger class above, and the other from the smaller class below, the midpoint. The net effect is improved axial end play with no appreciable effect on contact angle or bearing operation.

Abstract: A rolling bearing having bearing rings and rolling members wherein at least one of the bearing rings and the rolling members essentially consists of an alloy steel which contains carbide-forming elements. The bearing rings and the rolling members are subjected to carburizing or carbo-nitriding and then hardening to form a rolling surface layer. The content of retained austenite (.gamma..sub.R vol %) in the rolling surface layer is from 20 to 45% by volume and the hardness (Hv) of the rolling surface layer reinforced by dispersion of fine carbides or carbonitrides with an average grain size of from 0.5 to 1.5 .mu.m with regard to the content of the retained austenite (.gamma..sub.R vol %) is within the range of:-4.7.times.(.gamma..sub.R vol %)+920.ltoreq.Hv.ltoreq.-4.7.times.(.gamma..sub.R vol %)+1020.

Abstract: A machine part having a rolling or sliding surface formed with a plurality of minute recesses at random with the SK value less than zero in both the longitudinal and circumferential directions, and the area ratio of the recesses to the whole rolling surface being 10-40 percent.

Abstract: A roller bearing cage is made of a bent strip of sheet metal having abutting ends that are connected to one another, the cage being comprised of two end rings and a cage frame surrounding the windows, the windows retaining and guiding the rollers. In order to permit the manufacture of rolling element bearing cages of different reference circle diameters while using only one tool for rolling elements with a specific diameter d, the center distance between adjacent the cage windows in the circumferential direction is .pi.d/2.

Abstract: A bearing system providing redundancy of bearing function. An inner race and an outer race are concentric and axially spaced apart from one another. A bearing set includes a pin of individually rotatable bearing wheels. The wheels are mounted by an intermediate retainer. A selector is provided to restrain either of the races from rotation relative to its respective wheel, thereby providing for selection of which race is to be active in providing relative rotation of the races.

Abstract: A radial roller bearing consisting of rings and rollers, either the rolling contact surface of each roller or the raceway surfaces of the rings or both are crowned, the amount of crowning which is defined as .DELTA.t/l i.e., the depth of crowning .DELTA.t to the effective roller length of l, is set to 0.0007 to 0.002, the ring has a rib at its one end, the end surface of each roller which makes contact with the rib is spherically convex, while the contacted surface of the rib is spherically concave.

Abstract: A joint bearing in which a rolling member has been designed in such a way that relative to the inner race track and outer race track representing a circular arch, four contact points are obtained, the rolling member is associated with a central cylindrical portion and carrying portions which adjoin it at both ends, and has an outer contour with a radius which is osculated relative to the inner race track and the outer race track, so that a relatively small and compact joint bearing is formed which permits both an angular movement and a rotational movement while reducing friction. The four-point contact permits accurate guidance of the rolling members and eliminates the need for guiding edges.

Abstract: A self-aligning roller bearing having a plurality of spherical rollers disposed between the track surface of an inner race and the track surface of an outer race. Each roller has a rolling surface generator having central portion corresponding to at least 80% of the rolling surface axial length and of a single radius of curvature smaller than those of the inner and outer track surfaces. The rolling surface generator also has opposite end portions each with one or more radii of curvature smaller than that of the central portion.

Abstract: A roller element for use in a roller bearing having a surface formed with minute recesses at random so that the ratio RMS(L)/RMS(C) will be not more than 0.8 wherein RMS(L) is the roughness mean square value in the longitudinal direction and RMS(C) is the roughness mean square value in the circumferential direction and so that the SK value is not more than -0.2 in both the longitudinal and circumferential directions.

Abstract: In a self-aligning roller bearing having a plurality of spherical rollers disposed between the track surface of an inner race and the track surface of an outer race, the bus line on the track surface of the inner race is formed by a curve comprising a plurality of radii of curvature, and there are predetermined relations among the radius of curvature of the bus line on the rolling surface of the rollers, the radius of curvature of the bus line on the track surface of the outer race, the radius of curvature of the bus line on the track surface of the inner race corresponding to the axially central portion of each roller and the radii of curvature of the bus lines on the track surface of the inner race corresponding to the axial end portions of each roller.

Abstract: A roller bearing comprising an inner race, an outer race and rollers arranged between these races has a predetermined relationship between a maximum diameter of each roller of the bearing, a length of each roller, and radius of curvature of a contacting portion between a rolling surface of the roller and a chamfer portion of the roller.

Abstract: A ball bearing includes an outer ring having a rotation axis and an inner ring, which rotates relative to the outer ring, and a plurality of bearing balls disposed between the outer ring and the inner ring. A plurality of rollers are peripherally disposed between the bearing balls and are radially disposed between the outer ring and the inner ring. First and second axially spaced tracks are disposed on opposite sides of the bearing balls for supporting the rollers. First and second plates, which support the first and second tracks, are connected to and supported by the inner ring. The bearing balls and roller portions have respective radial dimensions, and the outer ring and inner ring and roller tracks have respective radial dimensions. Such radial dimensions can be specified using given formulas, in order to provide substantially pure rolling friction, without any sliding friciton.

Abstract: In an automatic self-aligning roller bearing including an inner race, an outer race and a plurality of rolling bodies disposed between the inner race and outer race, a radius of each of track grooves on the inner race and a radius of track groove on the outer race have a predetermined relationship established therebetween. Thus, a pressure developed on both the inner and outer races is simultaneously uniformly distributed as seen in the axial direction under a condition in proximity of a designed load whereby a running life of both the inner and outer races can be elongated. Consequently, a well balanced roller bearing of the above-mentioned type having a long running life is provided.