Abstract: A bearing assembly includes first and second races, a plurality of ball bearings positioned between the first and second races, and a spacer positioned between each of the ball bearings. The spacers each include a body defining opposite first and second sides, a first substantially concave pocket located at the first side of the body, and a second substantially concave pocket located at the second side of the body. The first and second substantially concave pockets each define a central region having a first radius of curvature about a first center point and an outer region adjacent to the central region that has a second radius of curvature about a second center point. The first and second center points are spaced from one another, and the body includes a portion extending in between at least the respective central regions of the first and second substantially concave pockets.

Abstract: An inventive ball bearing retainer (4) is entirely composed of a resin composition, and has pocket surfaces (6) for retaining balls (5) and projections (8) provided on the pocket surfaces (6) and containing a solid lubricant (CB). A ball bearing (1) incorporates the ball bearing retainer (4). By the effect of the solid lubricant (CB), the projections (8) are less liable to be worn out in a short period particularly when the ball bearing (1) is used in a higher temperature environment. The projections (8) define clearances between the balls (5) and the pocket surfaces (6), making it possible to maintain the effect of preventing noise, increase in the torque of the ball bearing (1), reduction of the service life of a lubricant and the like for a longer period of time.

Abstract: The present invention provides a rolling bearing which does not contain a hazardous substance and thus does not pollute environment. The present invention also provides a retainer, for holding rolling elements of the rolling bearing, which is made of a cold rolled steel plate. The retainer is subjected to at least one kind of surface treatment selected from among electrogalvanizing, electrotinning, electrolytic tin-zinc alloy plating, electrolytic zinc-iron alloy plating, and electrolytic zinc-nickel alloy plating. The retainer is further chromated with trivalent chromium. The rolling bearing uses the retainer for the rolling bearing.

Abstract: The invention relates to a rolling element bearing comprising a cage with at least one first group of guide pockets in which rolling bodies are guided with a certain play. According to the invention, the degree of play is different at least in a first guide pocket of the first group from the degree of play in a second guide pocket of said first group of guide pockets.

Abstract: The invention relates to a ball bearing with an inner race (2) and an outer race (1) disposed coaxially with respect to it, wherein between inner race (2) and outer race (1) bearing balls (6) are disposed which are guided by means of a cage (3), the cage (3) being comprised of a composite material. The invention addresses the problem of proposing a ball bearing, which combines a long service life with the properties of being capable of operating after a lubrication system failure. This is attained thereby that the composite material comprises epoxide resin as well as fibers.

Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.

Abstract: It is a cage that is formed of a resin and that holds balls serving as rolling elements. The cage includes an annular base portion, and a plurality of claw portions that are formed to be arranged at constant intervals on the circumference of the base portion and to protrude therefrom. A pocket for accommodating the ball is formed between each pair of adjacent ones of the claw portions. In the resin cage for a ball bearing, thinning recesses are formed in end parts 11a of the claw portions and a rear surface of the base portion, respectively.

Abstract: A cage (5) used in a ball bearing assembly is rendered to be of a ring shape having a plurality of pockets (5a) defined therein for holding a corresponding number of balls (4) in a circumferential row. The radius (Rp) of a bore of a circumferentially extending body of the cage (5) as measured from the geometric center of the bore to an inner peripheral surface area of the circumferentially extending body aligned with each of the pockets (5a) is chosen to be greater than the radius (Ri) as measured from the geometric center of the bore to a different inner peripheral surface area of the circumferentially extending body intermediate between the neighboring pockets (5a).

Abstract: Cage (1) having a plurality of cutouts (2) for receiving rolling bodies (3) of a joint (4), characterized in that the entire cage (1) has a substantially uniform ductility. The invention also proposes a way of producing the cage (1), in which the cage (1) is fully hardened and tempered. Also described are particular application areas in the automotive sector.

Abstract: The invention relates to a ball bearing with an inner race (2) and an outer race (1) disposed coaxially with respect to it, wherein between inner race (2) and outer race (1) bearing balls (6) are disposed which are guided by means of a cage (3), the cage (3) being comprised of a composite material. The invention addresses the problem of proposing a ball bearing, which combines a long service life with the properties of being capable of operating after a lubrication system failure. This is attained thereby that the composite material comprises epoxide resin as well as fibers.

Abstract: The invention relates to a roller bearing, with an inner running ring, an outer running ring, several roller bodies, arranged between the running rings and guided in a bearing cage, whereby the bearing cage comprises circumferential evenly distributed bearing pockets which are essentially axially and circumferentially enclosed, and each of which contains a roller body. According to the invention, the operational characteristics of the roller bearing may be improved whereby on each bearing pocket the bearing cage comprises at least one passive positioning element by means of which the pocket play of the corresponding roller body may be altered due to a temperature-dependent shape change of the positioning element.

Abstract: To provide a roller bearing assembly that can provide a high load bearing capacity and in which the strength of roller retainers can be increased, the roller bearing assembly includes inner and outer roller retainers (13, 23) each having a plurality of circumferentially arranged pockets (4), and a circular row of rollers (2) received in part within the pockets in the inner roller (13) and in part within the pockets in the outer roller (23). The inner roller retainer (13) has pillars (5) each left between the neighboring pockets to retain the circular row of the rollers from radially inwardly and having an outer diameter smaller than the diameter of the pitch circle PCD of the circular row of the rollers. The outer roller retainer (23) has pillars (5) each left between the neighboring pockets to retain the circular row of the rollers from radially outwardly and having an inner diameter greater than the pitch circle diameter PCD.

Abstract: A ball bearing assembly for a gas turbine engine comprises an inner race that couples to a rotor shaft; an outer race that couples to a primary static structural support; a plurality of ball elements between the inner race and the outer race; and a ball cage that comprises a carbon-carbon composite material to maintain the relative radial spacing of the ball elements between each other within the inner race and the outer race after subjection to high loads, heat generation and long-term storage.

Abstract: A calibrating basket for a film blowing tube is provided with roller bearings to prevent stripe formation on the film and pinching of the film between the rollers.

Abstract: A rolling element bearing comprises an inner ring (3) and an outer ring (2) each provided with a raceway (4, 5), said rings having land regions (10, 11) on opposite sides of their raceways, and a series of rolling elements (6) which are in rolling contact with the raceways and which are mutually spaced by a cage (7), said cage (7) engaging the land regions (10, 11) of said ring, said cage (7) being coated with a wear and friction reducing coating over its full surface.

Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.

Abstract: The designing of an annular integral type is established by forming a cage of a resin material that satisfies the condition (a) that the ratio of its linear expansion coefficient to that of bearing steel is not more than 2 or the condition (b) that its water absorption percentage is not more than 0.5%, or both conditions (a) and (b), thereby preventing the occurrence of abnormal sounds by stabilizing the behavior of a segment type cage for an ultrathin-walled rolling bearing.

Abstract: The bearing rings 1 and 2 of a rolling bearing is formed of one kind of titanium alloys of &bgr; type titanium alloys, near &bgr; type titanium alloys and &agr;+&bgr; type titanium alloys. The titanium alloy has a surface hardness of Hv 400 or more and less than Hv 600 for increasing the corrosion resistance and wear resistance of the bearing ring. Spherical rolling elements 3 rolling on the raceway surfaces 1a and 2a of the bearing rings 1 and 2 are formed of ceramics such as silicon nitride. When &bgr; type titanium alloys or &agr;+&bgr; type titanium alloys after a solution treatment and applied with an oxidation treatment at a low temperature of 400 to 600° C. are used as the material for the bearing ring, a bearing ring made of titanium alloy suitable to use under a circumstance requiring corrosion resistance is obtained.

Abstract: Each of resin cage (4) is injection-molded of a mixture material containing a thermoplastic resin selected as a material excellent in outgassing characteristic, a proper amount of reinforcing fiber, and a proper amount of a lubricating component. A lubricating film (10) made of a fluorine-containing polymer having a functional group is deposited on at least rolling surfaces and/or sliding surfaces of constituent members (inner and outer races (1 and 2), rolling elements (3) and cage 4) of a bearing. That is, the lubricating film (10) makes lubricity good at an early stage of rotation, so that incipient abrasion of the cage (4) can be suppressed. Hence, stabilization of operation with the passage of time can be exhibited on the basis of synergistic action of the lubricating film (10) and micro wear powder generated from the cage (4).

Abstract: The present invention provides a cage in which a nitride layer is formed on the surface by using an iron and steel material with a carbon content of 0.25% by weight or less, fabricating it into a predetermined shape and conducting nitriding, which is more excellent in slidability and wear resistance than conventional one. For this purpose, a nitride layer having a hardness of Hv 650 or more at a thickness of 3 &mgr;m or more and 15 &mgr;m or less is formed on the surface of a cage.

Abstract: A brass is a base material, and a material containing Mn and Si is cast to make a ring material. Ametallic structure in the cross section of the ring material is under a condition where an intermetallic compound Mn5Si3 is uniformly and finely scattered and precipitated in the base material (brass composed of &agr;- and &bgr;-phase). A machined retainer provided by matching said material has an excellent sizing precision, sound affect resistance.

Abstract: The retainer of the present invention is made of a composite material having a body made from a polymer, a layer of solid lubricant formed over the body by chemically coating the body with a porous layer of solid lubricant and impregnating the solid lubricant with another lubricant using conventional methods such as vacuum impregnation. The retainer is placed between an outer raceway and an inner raceway to form a self-lubricating bearing. The bearing made in this manner has high lubrication tolerance (i.e. it performs well in the absence of external lubrication). Because of its high lubrication tolerance, the bearing is suitable for use in various applications such as dental/medical hand pieces that are periodically sterilized and other applications which occasionally experience periods of lubrication starvation.

Abstract: A retainer constituting a rolling bearing is formed by melt-molding a resin composition containing a polyvinylidene fluoride resin as a main component.

Abstract: A cage is made of a low carbon steel and is for use in a rolling bearing which includes an outer ring, an inner ring and a plurality of rolling elements disposed rotationally between the outer ring and the inner ring. The cage includes a plurality of pockets for retaining the rolling elements in an equi-distribution in the rotating direction of the rolling elements. The low carbon steel is a steel containing from 0.02 to 0.10% by weight of C and from 0.10 to 0.45% by weight of Mn and is subjected to plastic working. The hardness for the pocket surface at least at a portion in contact with the rolling element is Hv 190 to 270, and the hardness for the core portion in the cage section is Hv 110 to 170.

Abstract: A sheet-metal cage for rolling-contact bearings, comprising at least one cage segment which is bent into a circular shape, of a punched-out sheet-metal strip which interlocks in a dovetailed manner at the joint between segment ends, the joint being fixed with a plastic locking part.

Abstract: Strength and rigidity are provided to a retainer so as to prevent the retainer from being deformed by force and sliding friction generated by rolling elements thereby preventing occurrence of retainer noise of a rolling bearing and aggravation of NRRO. A retainer is entirely formed of synthetic resin, and a highly elastic synthetic resin is used for the claws which are required to be highly elastic. A part below a boundary L of a body portion is formed of resin with sufficient strength and rigidity to prevent deformation due to force and sliding friction of rolling elements, thus preventing decline in strength of the retainer as a whole which may occur because of the use of resin with high elasticity for the claws. The strength of the retainer as a whole is fully ensured by the body portion, thus improving various functions, contributed by the rolling bearing.

Abstract: A rolling bearing comprises an inner ring, an outer ring concentric with the inner ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a cage having pockets each accommodating the rolling elements one each. The cage comprises base material made of thermoplastic resin. Reinforced fiber and solid lubricant are mixed into the base material. The solid lubricant includes three materials, i.e., polytetrafluoroethylene, molybdenum disulfide and graphite.

Abstract: The present invention provides a cage in which a nitride layer is formed on the surface by using an iron and steel material with a carbon content of 0.25% by weight or less, fabricating it into a predetermined shape and conducting nitriding, which is more excellent in slidability and wear resistance than conventional one. For this purpose, a nitride layer having a hardness of Hv 650 or more at a thickness of 3 &mgr;m or more and 15 &mgr;m or less is formed on the surface of a cage.

Abstract: The present invention provides a rolling bearing that prevents retainer noise and NRRO deterioration thereof by imparting strength and rigidity to a retainer so as to prevent it from being deformed by force from rolling elements and sliding friction. An annular plate is connected to a retainer by bosses. Due to the rigidity of the annular plate, the strength and rigidity of the retainer can be improved. Additionally, since the bosses are fixed to grease reservoirs arranged at an equal spacing therebetween on the circumference of the retainer, the strength and rigidity of the retainer can be equally improved over the entire circumference thereof.

Abstract: Each of resin cage (4) is injection-molded of a mixture material containing a thermoplastic resin selected as a material excellent in outgassing characteristic, a proper amount of reinforcing fiber, and a proper amount of a lubricating component. A lubricating film (10) made of a fluorine-containing polymer having a functional group is deposited on at least rolling surfaces and/or sliding surfaces of constituent members (inner and outer races (1 and 2), rolling elements (3) and cage 4) of a bearing. That is, the lubricating film (10) makes lubricity good at an early stage of rotation, so that incipient abrasion of the cage (4) can be suppressed. Hence, stabilization of operation with the passage of time can be exhibited on the basis of synergistic action of the lubricating film (10) and micro wear powder generated from the cage (4).

Abstract: An environment-friendly rolling bearing is proposed in which at least one of inner ring, outer ring, rolling elements, seals and retainer is formed of a biodegradable material.

Abstract: A retainer for rolling bearings is made from a phenol resin in which graphite and cotton fabric chips are mixed, and an inner circumferential surface and side surfaces other than inner circumferential surfaces of the pockets of the retainer are made of a skin layer. Therefore, the strength can be ensured with this skin layer, while the skin layer is absent in the inner circumferential surfaces of the pockets serving as sliding surfaces, allowing the graphite and the cotton fabric chips to be exposed, so that the lubricating performance can be ensured. Thus, a retainer for rolling bearings, as well as a manufacturing method therefor, which allows lubricating performance and strength to be ensured at the same time can be provided.

Abstract: The present invention relates to an improved rolling bearing, in particular one being used in aqueous environment, such as water and steam, comprising an outer race, an inner race, rolling elements, and a retainer holding said rolling elements in a spaced relation from each other, wherein the races of the bearing are made of stellite, the rolling elements are made of hot-isostatic-pressed alumina-zirconia composites, and the retainer is made of poly-ether ether ketone comprising graphite fibers, graphite powder, and polytetrafluoroethylene.

Abstract: An improved turbocharger for railway locomotive sized engines includes, in a preferred embodiment, first and second axially spaced ball bearings supporting a rotor with the first bearing being a hybrid ceramic ball bearing mounted to accept both radial and axial loads acting on the shaft at the compressor end. The first bearing is mounted on a reduced diameter portion of the shaft, providing reduced bearing diameter to acceptably limit centrifugal loading of ceramic balls in the bearing against a surrounding bearing race. The first bearing has dual rows of ceramic ball bearings mounted to share all axial thrust loads on the shaft. The second bearing is also a ball bearing. Lubrication of the bearings is preferably by direct impingement on the inner race to minimize oil churning causing heating and power loss. Additional features and advantages are disclosed.

Abstract: A rolling bearing comprises an inner ring, an outer ring concentric with the inner ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a cage having pockets each accommodating the rolling elements one each. The cage comprises base material made of thermoplastic resin. Reinforced fiber and solid lubricant are mixed into the base material. The solid lubricant includes three materials, i.e., polytetrafluoroethylene, molybdenum disulfide and graphite.

Abstract: In a steel cage for rolling bearing which is nitrided to form a compound layer on the surface thereof, when the thickness of a dense layer in the compound layer 1 is predetermined to a range of from 3 &mgr;m to 20 &mgr;m, the abrasion can be inhibited, improving the abrasion resistance. Further, when a porous layer which acts as a lubricant reservoir is predetermined to a range of from 2 &mgr;m to 25 &mgr;m, the exhaustion of lubricant can be inhibited, improving the seizing resistance.

Abstract: Method for manufacturing a cage, of the type intended to hold rolling bodies in place in a rolling bearing comprising at least one row of rolling bodies arranged between two raceways. The said cage comprises an annular part with cells intended to accommodate the rolling bodies, the said rolling bodies being clipped into the cells and held therein by means of elastically deformable members. The cage is obtained by moulding a blend of a polymer from the polyphthalamides group and of an elastomer.

Abstract: The present invention provides a rolling bearing which comprises a retainer that can be used without any deformation at high temperatures and fairly assembled to bearing and thus can be used under severe working conditions such as high temperature, high rotary speed and high load over an extended period of time. A novel rolling bearing is provided comprising a retainer made of a resin composition having a flexural modulus of at least 3,500 MPa at 180° C. and a heat-resistant temperature of at least 150° C.

Abstract: A retainer constituting a rolling bearing is formed by melt-molding a resin composition containing a polyvinylidene fluoride resin as a main component.

Abstract: A retainer constituting a rolling bearing is formed by melt-molding a resin composition containing a polyvinylidene fluoride resin as a main component.

Abstract: A bearing supports a rotating element. The bearing comprises an inner annular body and an outer annular body about the inner annular body. A bearing surface, which is located between the inner annular body and the outer annular body, supports the outer annular body for rotation about the inner annular body. A cage supports the bearing surface during rotation of the outer annular body about the inner annular body. The cage includes a material that imparts increased flexural modulus that resists deformation during rotation.

Abstract: A retainer for rolling bearings is made from a phenol resin in which graphite and cotton fabric chips are mixed, and an inner circumferential surface and side surfaces other than inner circumferential surfaces of the pockets of the retainer are made of a skin layer. Therefore, the strength can be ensured with this skin layer, while the skin layer is absent in the inner crcumferential surfaces of the pockets serving as sliding surfaces, allowing the graphite and the cotton fabric chips to be exposed, so that the lubricating performance can be ensured. Thus, a retainer for rolling bearings, as well as a manufacturing method therefor, which allows lubricating performance and strength to be ensured at the same time can be provided.

Abstract: A rolling bearing for a rotary shaft of a disk memory device which can maintain high-accuracy optical or magnetic recording ability over a long period of time. The rolling bearing supports a rotary shaft of a disk of disk memory device or a rotary shaft of an arm of a head, and has an inner ring having an inner diameter of 8 mm or less, and a retainer formed by molding an oil-containing resin composition comprising 40-94 wt % of a synthetic resin, 1-40 wt % of oil conducting material, and 5-30 wt % lubricating oil. Lubricating oil is dispersed uniformly in the composition, and can bleed onto the surface through the fibrous oil conducting material.

Abstract: A bearing retainer of a synthetic resin, which can be injection molded out of a material obtained by mixing at least particles of a heat resisting reins with a thermoplastic resin, and which can thereby be manufactured at a low cost without compromise in suitability for high-rotational-speed and high-temperature applications.

Abstract: A cage for a radial ball bearing formed generally in an annular shape and provided with a plurality of pockets with openings arranged in a circumferential direction to rotatably hold a plurality of balls adapted to rotate around a rolling central axis in the pockets, each of the pockets having an inner surface portion which includes a peripheral edge portions along the opening on the peripheral surfaces of the cage and is formed with an axial cylindrical surface having a central axis placed in the rolling central axis of the ball.

Abstract: A rolling bearing comprises races including an inner race and an outer race formed of an alloy steel material; and a plurality of rolling elements formed of a ceramic material and interposed between the inner race and the outer race in such a manner as to be capable of rolling, wherein at least one of the inner race and the outer race is formed of an alloy steel containing 0.7-1.5 wt. % Si, 0.5-2.0 wt. % Cr, and 0.5-2.0 wt. % Mo in a steel, and is subjected to carbonitriding treatment on the surface of the alloy steel material. The rolling bearing excels in the durability and heat resistance even if it is used in a high-temperature high-speed environment, and does not cause a noise fault.

Abstract: A rolling bearing for use in a dental hand-piece which can withstand sterilizing temperatures ranging from 135-200 .degree. C., and which can be rotated at a speed of 300000 rpm or higher with a minimum amount of lubricant used. This rolling bearing is used in a hand-piece having a shaft to which a dental rotary cutting tool is detachably mounted, a turbine fixed to the shaft, and a passage for introducing compressed air for driving the turbine. The rolling bearing has a retainer formed by sintering a polyimide resin powder so that it has 5-20% by volume of mutually communicating pores and impregnating the sintered member thus formed with a fluorinated oil.

Abstract: The present invention is intended to provide a pressed retainer which can meet requirements for operation at high temperature and high speed, can sufficiently retain lubricant, does not allow ceramic balls, if used, to cut away track surfaces and is superior in wear resistance, and also intended to provide a ball bearing comprising the pressed retainer.In order to solve problems, in the pressed retainer, wherein two ring-shaped retainer plates, having ball retaining portions and flat portions at predetermined intervals in the circumferential direction thereof, are combined to face with each other so as to form pockets for accommodating balls, a first spherical concave portion and a second spherical concave portion having a curvature radius smaller than that of the first spherical concave portion are formed at the ball retaining portions, and a nitrided layer is formed on the surfaces of the ring-shaped retainer plates. The ball bearing of the present invention uses the pressed retainer and ceramic balls.

Abstract: A rolling bearing apparatus is disclosed, which have a cage disposed between an inner ring raceway track and an outer ring raceway track in a freely rotatable manner so as to guide and hold a plurality of rolling elements, wherein said cage is made of a resin composition which comprises a melt-moldable fluororesin as the main component and further contains at least one solid lubricant having an average particle diameter of from 0.1 to 60 .mu.m and a fibrous filler having an aspect ratio of from 3 to 200.The rolling bearing apparatus is inexpensive and, in particular, is capable of retaining lubricity over long even in a high-temperature environment and is reduced in the outward flying of particles therefrom.

Abstract: A rolling bearing for a high-speed rotating equipment is constructed of an outer ring, an inner ring, rolling elements and a retainer to rotatably support at least a rotary shaft thereon. The retainer is composed of a molded porous synthetic resin body having a porous portion of a communicated structure in at least a part thereof. Further, the is lubricated with a lubricating oil comprising a nondrying vegetable oil.