Radial roller bearing

Abstract

To provide a radial roller bearing capable of preventing falling-off of a roller and improving handleability and load resistance.SOLUTION: A radial roller bearing includes a plurality of rollers arranged along a circumferential direction and rolling on at least one of an inner peripheral surface of a housing and an outer peripheral surface of a shaft, and a lubricant-containing polymer holding the plurality of rollers.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a radial roller bearing. [Background technology]

[0002] Radial roller bearings are generally used in various mechanical devices such as transmission gear supports and shaft supports in automobile transmissions. Among conventional radial roller bearings, those equipped with a cage are known for the purposes of preventing rolling damage before assembly of the bearing or for the purpose of holding the rollers at predetermined intervals in the circumferential direction.

[0003] The retainers for radial roller bearings described in Patent Documents 1 and 2 each have claws on the column portion or annular portion of the retainer to hold the rollers, thereby preventing the rollers from falling out radially to the outside or inside of the retainer.

[0004] Furthermore, Patent Document 3 discloses a cylindrical roller fall-out prevention device for preventing rollers from falling off radially inward of a cage during transportation, etc. After rollers are assembled into a cage that does not have means for preventing the rollers from falling off radially inward of the cage, the roller fall-out prevention device is placed radially inward of multiple rollers arranged along the circumferential direction. As a result, the rollers are supported on the radial outside by the cage and on the radial inside by the roller fall-out prevention device, preventing them from falling off the cage. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-139422 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-099162 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-160931 Summary of the Invention [Problem to be solved by the invention]

[0006] However, even with cages that have a function to prevent rollers from falling off, such as those described in Patent Documents 1 and 2, it can be difficult to completely prevent the rollers from falling off when assembling the rollers and cage into a bearing. Also, if the cage has pillars or has a function to restrict radial movement of the rollers, it can be difficult to reduce the distance between adjacent rollers in the circumferential direction, making it difficult to increase the number of rollers and improve the load capacity.

[0007] Furthermore, the roller stopper described in Patent Document 3 is intended to prevent rollers from falling off mainly during transportation. In other words, the roller stopper needs to be removed before the bearing is installed in a rotating machine, and there are issues with handling, such as the inability to prevent rollers from falling off when the bearing is installed in a rotating machine.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide a radial roller bearing that can prevent rollers from falling off and that can improve handling properties and load resistance. [Means for solving the problem]

[0009] The above object of the present invention can be achieved by the following configuration. (1) A plurality of rollers arranged along the circumferential direction and rolling on at least one of the inner circumferential surface of the housing and the outer circumferential surface of the shaft; a lubricant-containing polymer holding the rollers; Equipped with A radial roller bearing characterized by: [Effects of the Invention]

[0010] According to the present invention, by holding the rollers with a lubricant-containing polymer, it is possible to provide a radial roller bearing that can prevent the rollers from falling off and that can improve handling properties and load resistance. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a radial roller bearing according to a first embodiment. [Figure 2] 2(a) and 2(b) are cross-sectional views perpendicular to the circumferential direction of the radial roller bearing according to the first embodiment, with FIG. 2(a) showing the radial roller bearing according to the first embodiment alone, and FIG. 2(b) showing the radial roller bearing according to the first embodiment incorporated into a rotating machine. [Figure 3] FIG. 3 is a view of the radial roller bearing according to the first embodiment as viewed from the radial direction. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. [Figure 5] Figures 5(a) and (b) are cross-sectional views perpendicular to the circumferential direction of a radial roller bearing according to a modified example of the first embodiment, where Figure 5(a) shows the radial roller bearing according to the modified example of the first embodiment on its own, and Figure 5(b) shows the radial roller bearing according to the modified example of the first embodiment incorporated into a rotating machine. [Figure 6] FIG. 6 is a perspective view of a radial roller bearing according to the second embodiment. [Figure 7] Figures 7(a) and (b) are cross-sectional views perpendicular to the circumferential direction of a radial roller bearing according to a second embodiment, with Figure 7(a) showing the radial roller bearing according to the second embodiment alone, and Figure 7(b) showing the radial roller bearing according to the second embodiment incorporated into a rotating machine. [Figure 8] Figures 8(a) and (b) are cross-sectional views perpendicular to the circumferential direction of a radial roller bearing according to a modified example of the second embodiment, with Figure 8(a) showing the radial roller bearing according to the modified example of the second embodiment on its own, and Figure 8(b) showing the radial roller bearing according to the modified example of the second embodiment incorporated into a rotating machine. DETAILED DESCRIPTION OF THE INVENTION

[0012] (First embodiment) Embodiments of the present invention will now be described with reference to the accompanying drawings. Fig. 1 is a perspective view of a radial roller bearing according to a first embodiment. Figs. 2(a) and 2(b) are cross-sectional views perpendicular to the circumferential direction of the radial roller bearing according to the first embodiment, with Fig. 2(a) showing the radial roller bearing according to the first embodiment alone and Fig. 2(b) showing the radial roller bearing according to the first embodiment incorporated into a rotary machine. Fig. 3 is a view of the radial roller bearing according to the first embodiment as seen from the radial direction. Fig. 4 is a cross-sectional view as seen from the direction of arrow AA in Fig. 3.

[0013] 1, 2(a), and 2(b), radial roller bearing 10 has a plurality of rollers 100 arranged in the circumferential direction, and lubricant-containing polymer 20 that holds the plurality of rollers 100. In this embodiment, radial roller bearing 10 does not have raceways such as an outer ring or an inner ring. In other words, the plurality of rollers 100 are held by lubricant-containing polymer 20 so that they roll between the inner circumferential surface of housing 200 and the outer circumferential surface of shaft 300. In this way, radial roller bearing 10 incorporated into a rotating machine supports shaft 300 rotatably relative to housing 200.

[0014] The structure of the lubricant-containing polymer 20 will be described in detail below. As shown in FIGS. 1 to 4, the lubricant-containing polymer 20 is annularly formed so as to abut against both axial ends of the plurality of rollers 100 arranged in the circumferential direction. The lubricant-containing polymer 20 has a pair of coaxially arranged annular end portions 21, and a plurality of axially extending portions 23 that axially connect the pair of annular end portions 21 and fill the circumferential gaps between the circumferentially adjacent rollers 100. The lubricant-containing polymer 20 also has a plurality of radially outer slits 25a that are arranged radially outward of the lubricant-containing polymer 20 and expose a portion of the rolling surface of the plurality of rollers 100, and a radially inner slit 25b that is arranged radially inward of the lubricant-containing polymer 20 and exposes a portion of the rolling surface of each roller 100. The radially outer slits 25a and the radially inner slits 25b are formed along the axial direction between the circumferentially adjacent axially extending portions 23.

[0015] 4 in particular, axially extending portion 23 is formed between the circumscribing circle and the inscribing circle of multiple rollers 100 in a cross section perpendicular to the axial direction, and is formed so as to fill the circumscribing gap between circumferentially adjacent rollers 100. In other words, an outer peripheral surface 27 of axially extending portion 23 has an arc-shaped cross section and substantially coincides with the circumscribing circle of multiple rollers 100. Furthermore, an inner peripheral surface 29 of axially extending portion 23 has an arc-shaped cross section and substantially coincides with the inscribing circle of multiple rollers 100.

[0016] As shown in FIGS. 1 to 4, the radially outer slits 25a are circumferential gaps formed between circumferentially adjacent outer circumferential surfaces 27 when viewed from the radial direction. That is, the rolling surfaces of the rollers 100 exposed from the radially outer slits 25a come into contact with the inner circumferential surface of the housing 200. The radially inner slits 25b are circumferential gaps formed between circumferentially adjacent inner circumferential surfaces 29 when viewed from the radial direction. That is, the rolling surfaces of the rollers 100 exposed from the radially inner slits 25b come into contact with the outer circumferential surface of the shaft 300. The circumferential width Wa of the radially outer slits 25a and the circumferential width Wb of the radially inner slits 25b are constant regardless of the axial position.

[0017] Furthermore, the radial roller bearing 10 of this embodiment is called a full complement bearing, and in order to improve the load capacity, it may be configured so that circumferentially adjacent rollers 100 come into contact with each other. In such a case, the axially extending portion 23 is not formed near the circumference of the pitch circle P, where circumferentially adjacent rollers 100 come into contact. That is, as shown in particular in Figure 2(a), a circumferential slit 25c is formed between the axially extending portion 23 radially outward from the pitch circle P and the axially extending portion 23 radially inward from the pitch circle P, allowing the rolling surfaces of circumferentially adjacent rollers 100 to face each other.

[0018] On the other hand, in a full complement bearing, there may be gaps between circumferentially adjacent rollers 100, and the circumferentially adjacent rollers 100 may not contact each other. In such cases, it is not necessarily necessary to form the circumferential slits 25c as shown in Figure 2(a).

[0019] Lubricant-containing polymers that can be used in the present invention include, for example, synthetic resins selected from the group of polyolefin-based resins having basically the same chemical structure, such as polyethylene, polypropylene, polybutylene, and polymethylpentene, mixed with lubricants such as paraffinic hydrocarbon oils like poly-α-olefin oils, naphthenic hydrocarbon oils, mineral oils, ether oils like dialkyldiphenyl ether oils, and ester oils like phthalates, either alone or in the form of a mixture, and the resulting mixture is heated above the melting point of the resin to plasticize it, and then cooled to form a solid. Various additives such as antioxidants, rust inhibitors, anti-wear agents, antifoaming agents, and extreme pressure agents may also be added to the lubricant.

[0020] The composition ratio of the lubricant-containing polymer is 10 to 50% by weight of polyolefin resin and 90 to 50% by weight of lubricant, based on the total weight.

[0021] If the polyolefin resin content is less than 10% by weight, a certain level of hardness and strength cannot be achieved, and when a load is applied, for example, due to the rotation of the bearing, it becomes difficult to maintain the initial shape, increasing the possibility of problems such as detachment from the internal space of the bearing.

[0022] Furthermore, if the polyolefin resin exceeds 50% by weight (that is, if the lubricant is less than 50% by weight), the supply of lubricant to the bearing will be reduced, shortening the life of the bearing.

[0023] The group of synthetic resins has the same basic structure but different average molecular weights, ranging from 700 to 5×10 6 That is, the average molecular weight ranges from 700 to 1 × 10 4 waxes with an average molecular weight of 1×10 4 ~1×10 6 and those with a relatively low molecular weight of 1×10 6 ~5×10 6These ultra-high molecular weight polymers are used alone or in combination as needed. By combining relatively low molecular weight polymers with lubricants, lubricant-containing polymers with a certain degree of mechanical strength, lubricant supply ability, and oil retention can be obtained. If some of these relatively low molecular weight polymers are replaced with those classified as waxes, the affinity with lubricants increases due to the small difference in molecular weight between the waxes and the lubricants. As a result, the oil retention of the lubricant-containing polymer is improved, making it possible to supply lubricants for long periods of time. However, on the other hand, mechanical strength tends to decrease.

[0024] As the wax, in addition to polyolefin resins such as polyethylene wax, hydrocarbon waxes (for example, paraffin-based synthetic waxes) having a melting point in the range of 100 to 130° C. or higher can be used.

[0025] On the other hand, if an ultra-high molecular weight polymer is used, the difference in molecular weight between the ultra-high molecular weight polymer and the lubricant is large, resulting in a lower affinity with the lubricant, which results in a lower oil retention capacity and faster leaching of the lubricant from the lubricant-containing polymer. This shortens the time it takes for the lubricant-containing polymer to reach the amount of lubricant it can supply, shortening the life of the bearing. However, the mechanical strength is improved.

[0026] Considering the balance of moldability, mechanical strength, oil retention, and lubricant supply amount, the composition ratio of the lubricant-containing polymer is preferably 0 to 5 weight % of material classified as wax, 8 to 48 weight % of material with a relatively low molecular weight, 2 to 15 weight % of material with an ultra-high molecular weight, and the total of the three resin components being 10 to 50 weight % (the remainder being 90 to 50 weight % of lubricant).

[0027] As one aspect of mechanical strength, the hardness (HDA) of the lubricant-containing polymer of the present invention is preferably in the range of 65 to 85, and more preferably in the range of 70 to 80. If the hardness (HDA) is less than 65, the strength is weak and there is a risk of breakage due to the rotation of the bearing. On the other hand, if the hardness (HDA) is more than 85, the force that restrains the rollers (rolling elements) is large, which may increase the torque of the bearing or increase the heat generated by the rotation of the bearing, resulting in an increase in the temperature of the bearing.

[0028] In order to improve the mechanical strength of the lubricant-containing polymer of the present invention, the following thermoplastic resins and thermosetting resins may be added to the polyolefin resin.

[0029] As the thermoplastic resin, various resins such as polyamide, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, polyether sulfone, polyether ether ketone, polyamide imide, polystyrene, and ABS resin can be used.

[0030] These resins may be used alone or in combination.

[0031] Furthermore, in order to disperse the polyolefin resin and other resins in a more uniform state, an appropriate compatibilizer may be added as necessary.

[0032] To improve the mechanical strength, a filler may be added, such as inorganic whiskers, such as calcium carbonate, magnesium carbonate, potassium titanate whiskers, and aluminum borate whiskers, inorganic fibers, such as glass fibers and metal fibers, and fabrics made from these, or organic compounds, such as carbon black, graphite powder, carbon fibers, aramid fibers, and polyester fibers.

[0033] Furthermore, in order to prevent deterioration of the polyolefin resin due to heat, antioxidants such as N,N'-diphenyl-p-phenyldiamine and 2,2'-methylenebis(4-ethyl-6-t-butylphenol) may be added, and in order to prevent deterioration due to light, ultraviolet absorbers such as 2-hydroxy-4-n-octoxybenzophenone and 2-(2'-hydroxy-3'-t-butyl-5'-methyl-phenyl)-5-chlorobenzotriazole may be added.

[0034] The amount of all the additives (other than the polyolefin resin and lubricant) added is preferably 20% by weight or less of the total amount of molding raw materials in terms of maintaining the supply capacity of the lubricant.

[0035] The polymer materials that can be used in the present invention include those based on the polyolefin resins described above, as well as any thermoplastic resin that can be injection molded, and among these, those that can have a high oil content include, for example, polyester elastomers, etc. In addition to thermoplastic resins, thermosetting resins such as polyurethane and polyurea elastomers can also be used.

[0036] In the case of polyurethane, grease is used as a lubricant, and the reactive raw materials, a urethane prepolymer containing isocyanate groups, and / or an amine-based curing agent, are mixed uniformly into the grease. The two mixtures are then mixed again, filled into the bearing, and heated as necessary to cause a reaction, which is then cured while still containing the grease.

[0037] On the other hand, in the case of polyurea elastomers, an amine component consisting of a mixture of an aromatic polyamine compound containing soft segments in the molecular chain and an aromatic diamine is uniformly mixed with a lubricating oil compatible with the amine component or a grease based on the lubricating oil, and a polyisocyanate component is further added and mixed to the resulting mixture, which is then filled into a mold of the desired shape and heated as necessary to cause a reaction and cure in a state containing the lubricant.

[0038] The method for molding the lubricant-containing polymer 20 involves first arranging a cylindrical outer mold having an inner peripheral surface large enough to circumscribe the rollers 100, and a cylindrical or columnar inner mold having an outer peripheral surface large enough to inscribe the rollers 100, coaxially and so that they overlap when viewed radially. Then, the rollers 100 are arranged circumferentially between the outer mold and the inner mold, and a raw material for the lubricant-containing polymer 20, which has been heated to a temperature above its melting point and plasticized, is poured into the gap formed by the outer mold, inner mold, and rollers 100. The lubricant-containing polymer 20 is then solidified by applying pressure, cooling, or the like. This leaves the solid lubricant-containing polymer 20 holding the rollers 100, and the radial roller bearing 10 is obtained.

[0039] By the above molding, a radial outer slit 25a is formed at the portion where the outer die and the roller 100 contact, and a radial inner slit 25b is formed at the portion where the inner die and the roller 100 contact. A circumferential slit 25c is formed in the portion where adjacent rollers 100 contact each other in the circumferential direction.

[0040] The operation and effects of this embodiment will be described below. As shown in Figure 2(b), the radial roller bearing 10 is mounted between the housing 200 and the shaft 300. When torque is applied to the radial roller bearing 10 via the shaft 300, the torque is also applied to the rollers 100 via the rolling surfaces of the rollers 100 exposed from the radial outer slits 25a and the radial inner slits 25b. At this time, the lubricant acts as a lubricant between the lubricant-containing polymer 20 and the rollers 100, causing the rollers 100 to roll while maintaining the shape of the lubricant-containing polymer 20. In this way, the radial roller bearing 10 rotatably supports the shaft 300 relative to the housing 200.

[0041] In conventional radial roller bearings, rollers are prevented from falling off the cage by being restricted from moving radially inward and outward using a cage or roller fall-off prevention device. According to the configuration of this embodiment, the rollers 100 can be held in place by the lubricant-containing polymer 20, preventing the rollers 100 from falling off without the need for a cage or roller fall-off prevention device, making handling easier. Furthermore, by not using a cage, the rollers 100 can be arranged without gaps in the circumferential direction, resulting in improved load resistance.

[0042] Here, a modification of this embodiment will be described. FIGS. 5(a) and 5(b) are cross-sectional views perpendicular to the circumferential direction of a radial roller bearing according to a modification of the first embodiment, with FIG. 5(a) showing the radial roller bearing according to the modification of the first embodiment alone, and FIG. 5(b) showing the radial roller bearing according to the modification of the first embodiment assembled into a rotary machine. As shown in FIGS. 5(a) and 5(b), the radial roller bearing 10 may further include a cage 50 having a plurality of pockets 55 for accommodating a plurality of rollers 100. The cage 50 according to this modification includes a pair of coaxially arranged annular portions 51, a plurality of column portions 53 connecting the radially outer portions of the pair of annular portions 51 at a predetermined circumferential interval, and a plurality of pockets 55 formed by the pair of annular portions 51 and circumferentially adjacent column portions 53. The circumferential gap between circumferentially adjacent column portions 53 that form the pocket 55 is smaller than the diameter of the rollers 100. This prevents the rollers 100 housed in the pockets 55 from falling out of the cage 50 radially outward.

[0043] Furthermore, the rollers 100, except for portions of the rolling surfaces exposed from the radially outer slits 25a and the radially inner slits 25b, are covered together with the pair of annular portions 51 and column portions 53 by the lubricant-containing polymer 20. In other words, the rollers 100 are held by the lubricant-containing polymer 20 and the cage 50 so as to roll between the inner peripheral surface of the housing 200 and the outer peripheral surface of the shaft 300.

[0044] In this modified example, the annular end portion 21 of the lubricant-containing polymer 20 is formed so as to fill the axial gap between both axial ends of the roller 100 and the annular portion 51 of the cage 50. In addition, the annular end portion 21 covers the radially outer end portion and the radially inner end portion of the annular portion 51 of the cage 50.

[0045] The pillar portions 53 are disposed in the circumferential gaps between circumferentially adjacent rollers 100. Therefore, the axially extending portions 23 of the lubricant-containing polymer 20 are formed to cover the pillar portions 53 in the circumferential gaps between circumferentially adjacent rollers 100, and the axially extending portions 23 that cover the radially outer sides of the pillar portions 53 are formed thin. Also, there is a gap between circumferentially adjacent rollers 100, and all of the rollers 100 do not contact each other. In such a case, the circumferential slits 25c as shown in FIG. 2(a) are not formed, and the axially extending portions 23 are formed continuously in the radial direction.

[0046] In this modification, by combining the lubricant-containing polymer 20 with a cage 50 having a simple structure, it is possible to reduce the amount of material used for the lubricant-containing polymer 20 and keep costs down. In addition, the strength of the radial roller bearing 10 is improved, making the radial roller bearing 10 less likely to deform even when external forces are applied during transportation, etc. Furthermore, when the radial roller bearing 10 is installed in a rotating machine, it becomes easier to restrict the axial movement of the rollers 100.

[0047] Second Embodiment A radial roller bearing according to a second embodiment of the present invention will be described below. Note that some of the description of the same structure as in the first embodiment will be omitted. Fig. 6 is a perspective view of the radial roller bearing according to the second embodiment. Figs. 7(a) and 7(b) are cross-sectional views perpendicular to the circumferential direction of the radial roller bearing according to the second embodiment, with Fig. 7(a) showing the radial roller bearing according to the second embodiment alone and Fig. 7(b) showing the radial roller bearing according to the second embodiment assembled into a rotary machine. Figs. 8(a) and 8(b) are cross-sectional views perpendicular to the circumferential direction of a radial roller bearing according to a modification of the second embodiment, with Fig. 8(a) showing the radial roller bearing according to the modification of the second embodiment alone and Fig. 8(b) showing the radial roller bearing according to the modification of the second embodiment assembled into a rotary machine.

[0048] 6, 7(a) and 7(b), radial roller bearing 10 according to this embodiment comprises outer ring 70, which is a bearing ring having raceway surface 71 on its inner peripheral surface, a plurality of rollers 100 arranged so as to roll freely along raceway surface 71, and lubricant-containing polymer 20 that holds rollers 100. Rollers 100 roll between raceway surface 71 of outer ring 70 and the outer peripheral surface of shaft 300.

[0049] As in the first embodiment, the lubricant-containing polymer 20 is formed to extend in the axial direction between circumferentially adjacent axially extending portions 23, and has a plurality of radially outer slits (not shown) and radially inner slits 25b that expose part of the rolling surfaces of a plurality of rollers 100. In this embodiment, the rolling surfaces of the rollers 100 exposed from the radially outer slits (not shown) come into contact with the raceway surface 71, and the rolling surfaces of the rollers 100 exposed from the radially inner slits 25b come into contact with the outer peripheral surface of the shaft 300.

[0050] The radial roller bearing 10 shown in Figures 6, 7(a) and (b) employs a shell-shaped outer ring obtained by bending and forming a metal plate, but as shown in Figures 8(a) and (b), the outer ring 70 may also be a so-called solid type formed by machining a metal material.

[0051] In this embodiment, with multiple rollers 100 assembled into the outer ring 70, the gap formed between the multiple rollers 100 and the outer ring 70 is filled with raw material for the lubricant-containing polymer 20 that has been plasticized by heating it above its melting point, thereby forming the radial roller bearing 10.

[0052] According to this embodiment, the rollers 100 can be held by the lubricant-containing polymer 20 even on the raceway surfaces of the outer ring 70, inner ring, etc., making it possible to improve handling and load resistance.

[0053] The present invention is not limited to the embodiments exemplified above and may be modified as appropriate without departing from the spirit and scope of the present invention. For example, the radial roller bearing 10 is not limited to the first embodiment, in which the rollers 100 roll between the housing 200 and the shaft 300 without raceways such as an outer ring and an inner ring, or the second embodiment, in which the rollers 100 roll between the housing 200 and the shaft 300. In other words, the radial roller bearing 10 also includes a bearing having an inner ring with a raceway surface 71 on its inner circumferential surface but no outer ring, and a bearing having an outer ring and an inner ring. Furthermore, the shape of the lubricant-containing polymer 20 may be any shape capable of supporting the rollers 100 in a rollable manner. For example, the outer circumferential surface 27 and the inner circumferential surface 29 of the lubricant-containing polymer 20 may be formed between the circumscribed circle and the inscribed circle of the rollers 100 in a cross section perpendicular to the axial direction, and need not be arc-shaped. That is, it is sufficient that the outer peripheral surface 27 of the axially extending portion 23 is located slightly radially inward of the circumscribing circle of the plurality of rollers 100, exposing the rollers 100 so that part of the rolling surface of the rollers 100 faces the housing 200 or the outer ring 70. Also, it is sufficient that the inner peripheral surface 29 of the axially extending portion 23 is located slightly radially outward of the inscribing circle of the plurality of rollers 100, exposing the rollers 100 so that part of the rolling surface of the rollers 100 faces the shaft 300 or the inner ring. Also, the circumferential width Wa of the radially outer slits 25a and the circumferential width Wb of the radially inner slits 25b do not have to be constant regardless of the axial position. And the cage of the radial roller bearing shown in the modified example of the first embodiment is not limited to the exemplified shape, and may be a so-called comb-shaped cage having a single annular portion in addition to one having a pair of annular portions.

[0054] As described above, the present specification discloses the following: (1) A plurality of rollers arranged along the circumferential direction and rolling on at least one of the inner circumferential surface of the housing and the outer circumferential surface of the shaft; a lubricant-containing polymer holding the rollers; Equipped with A radial roller bearing characterized by: This configuration makes it possible to provide a radial roller bearing that can prevent the rollers from falling off and improves handling and load resistance.

[0055] (2) The bearing further includes a cage having a plurality of pockets for accommodating the plurality of rollers, The rollers are held by the lubricant-containing polymer and the cage, and roll between the inner circumferential surface of the housing and the outer circumferential surface of the shaft. The radial roller bearing according to (1), characterized in that: With this configuration, by combining a cage and a lubricant-containing polymer to hold the rollers, the amount of lubricant-containing polymer used can be reduced. Furthermore, radial roller bearing 10 is less likely to deform even if external forces are applied during transportation, etc. Furthermore, when radial roller bearing 10 is installed in a rotating machine, it becomes easier to restrict axial movement of rollers 100.

[0056] (3) The bearing further includes a bearing ring having a raceway surface on the inner or outer peripheral surface, The rollers roll between the raceway surface and the inner peripheral surface of the housing or the outer peripheral surface of the shaft. The radial roller bearing according to (1) or (2), characterized in that: This configuration makes it possible to prevent rollers from falling off even in a radial roller bearing having raceways, thereby improving handling and load resistance.

[0057] (4) The lubricant-containing polymer is a pair of annular end portions formed in an annular shape and arranged coaxially so as to abut against both axial end portions of the rollers; a plurality of axially extending portions that connect the pair of annular end portions in the axial direction and are formed so as to fill circumferential gaps between the rollers that are adjacent in the circumferential direction; a plurality of slits formed along the axial direction between the axially extending portions adjacent to each other in the circumferential direction, the slits exposing portions of the rolling surfaces of the rollers; Equipped with The radial roller bearing according to any one of (1) to (3), characterized in that According to this configuration, the rollers can be held in a rollable manner by the lubricant-containing polymer. [Explanation of symbols]

[0058] 10 Radial roller bearings 20 Lubricant-containing polymer 21 Annular end 23 Axial extension 25a Radial outer slit 25b Radial inner slit 25c Circumferential slit 27 Outer surface 29 Inner surface 50 retainer 51 Annular part 53 Pillar section 55 pockets 70 outer ring (bearing ring) 71 Raceway surface 200 Housing 300 axes

Claims

1. a plurality of rollers arranged along a circumferential direction and rolling on at least one of an inner circumferential surface of the housing and an outer circumferential surface of the shaft; a lubricant-containing polymer holding the rollers; Equipped with A radial roller bearing characterized by:

2. a cage having a plurality of pockets for accommodating the plurality of rollers; The rollers are held by the lubricant-containing polymer and the cage, and roll between the inner circumferential surface of the housing and the outer circumferential surface of the shaft.

2. A radial roller bearing according to claim 1, characterized in that:

3. Further provided is a bearing ring having a raceway surface on an inner peripheral surface or an outer peripheral surface, The rollers roll between the raceway surface and the inner peripheral surface of the housing or the outer peripheral surface of the shaft.

2. A radial roller bearing according to claim 1, characterized in that:

4. The lubricant-containing polymer is a pair of annular end portions formed in an annular shape and arranged coaxially so as to abut against both axial end portions of the rollers; a plurality of axially extending portions that connect the pair of annular end portions in the axial direction and are formed so as to fill circumferential gaps between the rollers that are adjacent in the circumferential direction; a plurality of slits formed along the axial direction between the axially extending portions adjacent to each other in the circumferential direction, the slits exposing portions of the rolling surfaces of the rollers; Equipped with 4. A radial roller bearing according to claim 1, wherein the bearing is a radial roller bearing having a diameter of 100 mm or less.

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