JP2018173119A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To combine reduction of rotating torque and lubrication performance of a rolling bearing by means different from coating of a solid lubricant.SOLUTION: A retainer 40 is provided with flock portions 60-63 on a surface excluding a pocket inner face 45 of a pillar portion 41 kept into contact with a rolling element 30 disposed in a pocket 44, and pocket inner faces 46, 47 of connecting portions 42, 43, of the pillar portion 41 and the connecting portion 42. The flock portions 60-63 are disposed in a manner that they cannot be kept into contact with the rolling element 30 disposed in the pocket 44. Thus a lubricant is held by the flock portions 60-63, stirring and shearing of the lubricant are suppressed, and abrasion of the flock portions 60-63 is prevented so that a service life is elongated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing provided with a cage, and more particularly to lubricating the inside of the rolling bearing.

  The rolling bearing is usually provided with a cage in order to maintain a circumferential interval between a predetermined number of rolling elements interposed between the inner and outer raceway surfaces. The rolling element is accommodated in the pocket of the cage. The contact portion between the rolling element and other bearing parts is lubricated by a lubricant (lubricating oil or grease) present inside the bearing. As the bearing rotates, the lubricant is agitated by the rolling elements that roll between the inner and outer raceway surfaces, and is discharged from the raceway surfaces and pockets. Various improvements have been made to improve the lubrication characteristics inside such a bearing.

  For example, in order to prevent smearing, seizure, wear, and peeling under high speed and high load, a solid lubricant film is formed on the raceway surface and rolling element surface by shot peening treatment (patent) Reference 1).

  In addition, grease lubrication that lubricates the inside of the bearing with grease oil has excellent peeling resistance and leakage, and as a grease that can suppress premature seizure even when used in an outer ring rotary bearing, a predetermined ester oil and diurea compound are used. Has been proposed (see Patent Document 2).

Japanese Patent No. 5045806 Japanese Patent No. 3330755

  However, in the rolling device of Patent Document 1, since the lubricating coating is formed on the surface of the rolling element and other members that are in contact with this, it is necessary to form the coating with high accuracy, and the manufacturing cost increases.

  In recent years, rolling bearings used for automobiles, industrial equipment, and the like are required to reduce bearing rotational torque while ensuring a sufficient lubrication life in order to save energy.

  If the amount of lubricating oil supplied from the outside to the inside of the bearing and the amount of grease filled are reduced, the bearing rotational torque can be reduced, but there is a growing concern that lubrication will be insufficient between the rolling elements and other bearing parts, There is also a concern that the lubrication life may be shortened. Even if the lubricant itself is devised as in Patent Document 2, if the amount of lubricant supplied into the bearing is reduced, there is no change in these concerns.

  In view of the above-described background, the problem to be solved by the present invention is to achieve both reduction of the rotational torque of the rolling bearing and lubrication performance by means different from the coating processing of the solid lubricant.

  In order to solve the above-described problems, the present invention includes a predetermined number of rolling elements and a retainer that maintains a circumferential interval between the rolling elements, and the retainer includes a predetermined number of columns arranged at a predetermined interval in the circumferential direction. Part and a connecting part continuous on one side in the axial direction of these pillar parts, the rolling elements are disposed in pockets between the pillar parts adjacent in the circumferential direction, and the pillar part and the joining part are In the rolling bearing having a pocket inner surface that can come into contact with the rolling elements arranged in the pocket, the retainer is implanted on a surface other than the pocket inner surface of at least one of the pillar portion and the connecting portion. In addition, a configuration is adopted in which the hair transplantation portion is made of a plurality of fibers, and the hair transplantation portion is provided so as not to contact the rolling elements disposed in the pocket.

  According to the said structure, a lubricant is hold | maintained with the fiber of the flocked part provided on the surface of the pillar part of a cage | basket, or a connection part. The lubricant held in the flocked portion of the cage is eventually supplied to the contact portion between the rolling element and other bearing parts. Since the flocked portion cannot contact with the rolling elements, there is no fear of wearing during rotation of the bearing, and the life is long. Moreover, the lubricant held in the flocked portion on the surface that is not in contact with the rolling element among the cages rotates together with the cage without receiving shear from the rolling elements, and no stirring resistance is generated. For this reason, it is possible to reduce the bearing rotational torque without reducing the amount of lubricant supplied into the bearing. As described above, it is possible to achieve both reduction of the bearing rotational torque and lubrication performance by means different from the coating processing of the solid lubricant.

  In particular, in the case of grease lubrication, the agitation and shearing of the grease by the rolling elements are suppressed, resulting in a low torque and a long life. Further, since the grease can be held by the flocked portion, the movement of the grease inside the bearing is suppressed, and the grease leakage is suppressed and the service life is extended.

  For example, the flocked portion is provided on the inner diameter surface of the column portion.

  For example, the flocked part is provided in an area larger in diameter than the pocket inner surface of the pillar part.

  For example, the column portion has a recess recessed in the circumferential direction from the pocket inner surface of the column portion, and the flocked portion is provided on the recess of the column portion. If it does in this way, it will avoid shearing of a lubricant between rolling elements which contacted the pocket inner surface of a pillar part, and a flocking part on the concave part of the pillar part, and between a pillar part and a rolling element. It is possible to reduce the shear resistance of the lubricant.

  For example, the connecting portion has a recess that is recessed in the axial direction from the inner surface of the pocket of the connecting portion, and the flocked portion is provided on the recess of the connecting portion. If it does in this way, it will avoid the shearing of a lubricant between rolling elements which contacted the pocket inner surface of a joint part in the concave part of a joint part, and the flocked part on the concave part, and between a joint part and rolling elements. It is possible to reduce the shear resistance of the lubricant.

  More preferably, the connecting portion has a recess recessed in the axial direction from the pocket inner surface of the connecting portion, and the flocked portion is formed by the recess of the pillar portion and the recess of the connecting portion. It is provided on the corner. The shapes of the column part and the connecting part that form such a corner part are common. If the corner is used, the flocked portion can be provided so as not to contact the rolling element, and the column portion and the connecting portion do not need to be formed into a special shape.

  For example, the rolling element comprises a tapered roller, and the cage includes the connecting portion on the small diameter side continuous with the small diameter side of the column portion and the connecting portion on the large diameter side continuous with the large diameter side of the column portion. The hair transplant part is provided only on the surface of the small diameter side connection part among the small diameter side connection part and the large diameter side connection part. During the rotation of the tapered roller bearing, the end surface on the large diameter side of the rolling element frequently contacts the connecting portion on the large diameter side of the cage. If there is a recess in the connecting portion on the large diameter side, there is a concern that the lubricant adhering to the end surface on the large diameter side of the rolling element may be cut in the vicinity of the recess, which is not preferable.

  In the present invention, by adopting the above-described configuration, it is possible to achieve both reduction in bearing rotational torque and lubrication performance by means different from solid lubricant coating.

Longitudinal front view showing a rolling bearing according to the first embodiment of the present invention The partial expanded plan view which shows the pocket shape of the holder | retainer of FIG. Partial expanded sectional view which shows the cross section of the III-III line in FIG. The partial enlarged plan view which shows the pocket shape which concerns on 2nd embodiment of this invention

  Hereinafter, a rolling bearing according to a first embodiment which is an example of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, this rolling bearing includes an inner ring 10 having a raceway surface 11 on the outer periphery, an outer ring 20 having a raceway surface 21 on the inner periphery, a raceway surface 11 of the inner ring 10, and a raceway surface 21 of the outer ring 20. Are provided with a predetermined number of rolling elements 30 and a retainer 40 that keeps the circumferential distance of the rolling elements 30, and the rolling element 30 is configured as a tapered roller bearing made of tapered rollers.

  Here, the circumferential direction refers to a circumferential direction around a bearing central axis (not shown). Hereinafter, a direction along the bearing central axis is referred to as an “axial direction”, and this axial direction corresponds to the left-right direction in FIG. A direction perpendicular to the bearing central axis is referred to as a “radial direction”, and this radial direction corresponds to the vertical direction in FIG.

  The retainer 40 includes a predetermined number of column portions 41 arranged at predetermined intervals in the circumferential direction, a small-diameter side connection portion 42 that is continuous with one axial side (small-diameter side) of the column portions 41, and a connection portion between the column portions 41. 42 is configured as a cage-type cage having a connecting portion 43 on the large diameter side continuous to one axial side (large diameter side) opposite to 42. The connecting portions 42 and 43 have an annular shape over the entire circumference. The rolling elements 30 are disposed in the pockets 44 between the column portions 41 adjacent in the circumferential direction.

  The column part 41 has the pocket inner surface 45 which can contact the rolling element 30 arrange | positioned in the pocket 44 in the circumferential direction. The connecting portion 42 on the small diameter side has a pocket inner surface 46 that can contact the rolling elements 30 arranged in the pocket 44 in the axial direction. The large-diameter-side connecting portion 43 has a pocket inner surface 47 that can contact the rolling elements 30 disposed in the pocket 44 in the axial direction. A pocket clearance between the cage 40 and the rolling element 30 is set between the pocket inner surfaces 45 to 47 and the rolling element 30.

The column portion 41 has a recess 48 that is recessed in the circumferential direction from the pocket inner surface 45 of the column portion 41. The column part 41 has the recess 48 in a total of four places, two places on each one side of the circumferential direction. These recesses 48 are located at the axial end on the small diameter side and the axial end on the large diameter side of the column portion 41. For this reason, the pocket inner surface 45 is located in the intermediate portion in the axial direction of the column portion 41. The recess 48 on the small diameter side has a notch shape recessed in the circumferential direction from one axial end of the pocket inner surface 45. The large-diameter-side recess 48 has a notch shape that is recessed in the circumferential direction from the other axial end of the pocket inner surface 45.

  The pocket inner surface 45 of the column part 41 is continuous with the inner diameter surface 49 of the column part 41. The inner diameter surface 49 of the column portion 41 is an arcuate surface that defines the inner diameter of the column portion 41. The pocket inner surface 45 has an inclined surface shape that gradually approaches the rolling element 30 from the inner diameter surface 49 toward the larger diameter side. When the rolling element 30 interposed between the inner and outer raceway surfaces 11 and 12 and the pocket inner surface 45 are in contact with each other in the circumferential direction (the rolling element 30 in this state is indicated by a two-dot chain line in FIG. 2). The region of the column part 41 existing at a position larger than 45 cannot contact the rolling element 30.

  The connecting portion 42 on the small diameter side has a recess 50 that is recessed in the axial direction from the pocket inner surface 46 of the connecting portion 42. The recess 50 is located at one place in the circumferential intermediate portion of the circumferential area extending between the column portions 41 adjacent in the circumferential direction. For this reason, the connecting portion 42 on the small diameter side has pocket inner surfaces 46 at two locations in the circumferential direction. Each pocket inner surface 46 is continuous with the recess 48 of the column 41 on the corresponding side. The recess 50 has a notch shape that is recessed in the axial direction from the circumferential end of the pocket inner surface 46 on one circumferential side and recessed in the axial direction from the circumferential end of the pocket inner surface 46 on the other circumferential side.

  The retainer 40 has flocked portions 60 to 63 on a surface other than the pocket inner surfaces 45 to 47 among at least one of the column portion 41 and the connecting portions 42 and 43.

  The first flocked portion 60 is provided on the inner diameter surface 49 of the column portion 41. The first flocked portion 60 is composed of a plurality of fibers 60 a planted on the inner diameter surface 49.

  The second flocked portion 61 is provided on the recess 48 of the column portion 41. The second hair transplant portion 61 is composed of a plurality of fibers 61 a planted on the recess 48. A second flocked portion 61 is provided in each recess 48.

  The third flocked portion 62 is provided in a region having a larger diameter than the pocket inner surface 45 of the column portion 41. The 3rd hair transplant part 62 consists of the some fiber 62a planted on the circumferential direction end surface which continues to the large diameter side from the pocket inner surface 45 among the pillar parts 41. FIG.

  The fourth flocked portion 63 is provided on the recess 50 of the connecting portion 42 on the small diameter side. The fourth flocked portion 61 is composed of a plurality of fibers 63 a planted on the recess 50.

  Each fiber is attached to the surface of the corresponding cage 40 at one end of the fiber. The length of each of the fibers 60 a, 61 a, 62 a, 63 a is set to a dimension that makes it impossible to contact the rolling elements 30 arranged in the pocket 44.

  Each flocked portion 60, 61, 62, 63 has a structure in which corresponding fibers 60a, 61a, 62a, 63a are planted at a predetermined density, and minute gaps are randomly generated between the corresponding fibers 60a, 61a, 62a, 63a. It has become. Each flocked part 60, 61, 62, 63 captures the lubricant flowing inside the bearing with the corresponding fibers 60a, 61a, 62a, 63a and holds them between the corresponding fibers 60a, 61a, 62a, 63a. Since each flocking part 60, 61, 62, 63 is mainly supplied to the rolling element 30, the contact part (for example, contact with the rolling element 30 and the track surfaces 11, 21) of the rolling element 30 and other bearing components. Part) is easily supplied with the lubricant.

  Examples of the fibers 60a, 61a, 62a, and 63a include synthetic resin fibers, inorganic fibers, regenerated fibers, and natural fibers. Examples of the synthetic resin fiber include polyolefin resins such as polyethylene and polypropylene, polyamide resins such as nylon, aromatic polyamide resins, polyethylene terephthalate, polyethylene naphthalate, polyethylene succinate, polyester resins such as polybutylene terephthalate, acrylic resins, Examples thereof include vinyl chloride and vinylon. Examples of inorganic fibers include carbon fibers and glass fibers. Examples of the regenerated fiber include rayon and acetate. Examples of natural fibers include cotton, silk, hemp, and wool. These may be used independently and 2 or more types may be used together. When a synthetic resin fiber is used for a flexible structure, it is difficult to swell or dissolve due to oil and is chemically stable, and a large amount of homogeneous fibers can be produced and can be obtained at low cost.

  As the shape of the fibers 60a, 61a, 62a, 63a, for example, those having a length of 0.5 to 2.0 mm and a thickness of 0.5 to 50 dtex are preferable. Examples of the linear shape of the fibers 60a, 61a, 62a, and 63a include a straight shape and a bend (a shape in which a tip portion is bent). The bend shape can hold the grease more strongly than the straight shape. Examples of the cross-sectional shape of the fibers 60a, 61a, 62a, and 63a include a circular shape and a polygonal shape. In the case of a polygonal cross section, the fibers can have a larger surface area than in the case of a circular cross section, and the surface tension of the lubricant can be increased.

  The fiber density in each flocked part 60, 61, 62, 63 is preferably 10 to 30% in the proportion of the fibers 60a, 61a, 62a, 63a per area of the corresponding flocked part 60, 61, 62, 63.

  Spraying or electrostatic flocking can be employed as a flocking method. Even in the curved surface portion, it is preferable to employ electrostatic flocking because a large amount of fibers 60a, 61a, 62a, 63a can be densely flocked in a short time. As the electrostatic flocking method, a known method can be adopted. For example, an adhesive is applied to the area where electrostatic flocking is performed, the fibers 60a, 61a, 62a, 63a are charged, and flocked substantially perpendicularly to the adhesive application surface by electrostatic force, and then a drying process and a finishing process are performed. A method is mentioned. Of course, it is preferable that the adhesive does not adhere to the pocket inner surfaces 45 to 47 in contact with the rolling elements 30.

  Examples of the adhesive include an adhesive mainly composed of urethane resin, epoxy resin, acrylic resin, vinyl acetate resin, polyimide resin, silicone resin, and the like. For example, urethane resin solvent adhesive, epoxy resin solvent adhesive, vinyl acetate resin solvent adhesive, acrylic resin emulsion adhesive, acrylate-vinyl acetate copolymer emulsion adhesive, vinyl acetate emulsion adhesive , Urethane resin emulsion adhesive, epoxy resin emulsion adhesive, polyester emulsion adhesive, ethylene-vinyl acetate copolymer adhesive and the like. These may be used independently and 2 or more types may be used together.

  If synthetic resin fibers are used as the fibers 60a, 61a, 62a, 63a and the corresponding flocked portions 60, 61, 62, 63 are provided by electrostatic flocking, the chemicals are less likely to swell or dissolve due to lubricating oil or grease base oil. It is stable and can form a uniform and dense flocked part.

About the raw material of the column part 41 and the connection parts 42 and 43, arbitrary materials, such as a steel plate and a synthetic resin, are employable. What is necessary is just to determine the above-mentioned adhesive seed | species etc. according to the raw material of the pillar part 41 and the connection parts 42 and 43, the material of fiber 60a, 61a, 62a, 63a, temperature conditions, etc.

  The lubricant used for this rolling bearing is a lubricating oil or grease. Lubricant is supplied and sealed in the space inside the bearing. Any lubricant can be used without particular limitation as long as it is usually used in rolling bearings.

  For example, lubricating oils include mineral oils such as paraffinic mineral oils and naphthenic mineral oils, hydrocarbon-based synthetic oils such as polybutene oils, poly-α? Olefin oils, alkylbenzene oils, and alkylnaphthalene oils, or natural oils and polyol ester oils. Non-hydrocarbon synthetic oils such as phosphate ester oil, diester oil, polyglycol oil, silicone oil, polyphenyl ether oil, alkyl diphenyl ether oil, and fluorinated oil. These lubricating oils may be used alone or in combination of two or more.

  For example, the above-mentioned lubricating oil can be cited as the base oil constituting the grease, and the thickeners constituting the grease include metals such as aluminum soap, lithium soap, sodium soap, composite lithium soap, composite calcium soap, and composite aluminum soap. Examples include soap-based thickeners, urea-based compounds such as diurea compounds and polyurea compounds, and fluororesin powders such as PTFE resins. These thickeners may be used alone or in combination of two or more.

  Moreover, a well-known additive can be added to a lubricant as needed. Examples of additives include extreme pressure agents such as organic zinc compounds and organic molybdenum compounds, antioxidants such as amine-based, phenol-based and sulfur-based compounds, anti-wear agents such as sulfur-based and phosphorus-based compounds, and polyhydric alcohols. Examples include rust preventives such as esters, viscosity index improvers such as polymethacrylate and polystyrene, solid lubricants such as molybdenum disulfide and graphite, and oily agents such as esters and alcohols.

  In the case of grease lubrication, the grease, which is a lubricant, adheres to the flocked portions 60 to 63 in a semi-solid state when sealed inside the bearing, and is held by the flocked portions 60 to 63 even when liquefied during rotation of the bearing. It is possible to rotate with the cage 40 without undergoing shear. Accordingly, the grease stirring resistance by the rolling elements 30 can be suppressed, and the bearing rotational torque can be reduced.

  The amount of grease filled is not particularly limited as long as desired lubrication characteristics can be ensured, but is preferably about 50% to 80% (volume ratio) of the static space volume in the bearing inner space. In this rolling bearing, since the grease is held in the flocked portions 60 to 63 of the cage 40, it is possible to reduce the stirring resistance of the grease and reduce the bearing rotational torque while keeping the amount of sealing in the above range. it can.

  Grease softens when subjected to shearing and easily releases oil, shortening the lubrication life. However, with this rolling bearing, the grease held in the flocked parts 60 to 63 is not easily subjected to shearing, and the lubrication life is prolonged. I can plan.

  Moreover, in the case of oil lubrication, it is possible to start the operation with the lubricating oil held in advance in the flocked portions 60 to 63 as necessary. In this case, the lubricating oil can be held inside the bearing without supplying the lubricating oil from the outside, and since there is no semi-solid substance that provides rotational resistance like grease, the torque can be reduced. Become.

  This rolling bearing is as described above, and the lubricant is held by a large number of fibers 60a to 63a of the flocked portions 60 to 63 provided on the surfaces of the column portion 41 and the connecting portion 42 of the cage 40. . The lubricant held in the flocked parts 60 to 63 of the cage 40 will eventually be in contact with the rolling elements 30 and other bearing parts (inner ring 10, outer ring 20, cage 40) (track surfaces 11, 12, pocket inner surface). 45). Since the flocked parts 60 to 63 cannot contact the rolling elements 30 disposed in the pockets 44 during the rotation of the bearing, there is no concern that the rotating rolling elements 30 will be worn by rubbing, and the lubricant is stable over a long period of time. It is possible to exhibit the holding performance of and has a long life. Since the lubricant held in the flocked portions 60 to 63 on the surface of the retainer 40 that is not in contact with the rolling element 30 disposed in the pocket 44 rotates together with the retainer 40 without being sheared from the rolling element 30, It is not stirred by the rolling element 30, and the stirring resistance is not generated accordingly. For this reason, it is possible to reduce the bearing rotational torque without reducing the amount of lubricant supplied into the bearing. As described above, this rolling bearing is different from the coating process of the solid lubricant, and is a flocking means for planting fibers on the material surface of the column part 41 and the connecting part 42, and achieves both reduction of the bearing rotational torque and lubrication performance. Can be achieved.

  In particular, in the case of grease lubrication, this rolling bearing suppresses the agitation and shearing of the grease by the rolling elements 30 and has a low torque and a long life. Further, since the grease can be held by the flocked portions 60 to 63, the movement of the grease inside the bearing is suppressed, and the grease leakage is suppressed and the life is prolonged.

  Further, this rolling bearing has a recess 48 that is recessed in the circumferential direction from the pocket inner surface 45 of the column portion 41, and a flocked portion 61 that cannot contact the rolling elements 30 disposed in the pocket 44 is provided on the recess 48. Therefore, in the recess 48 and the flocked portion 61, shearing of the lubricant is avoided between the rolling element 30 and the rolling element 30 in contact with the pocket inner surface 45, and the lubricant between the column part 41 and the rolling element 30 is avoided. The shear resistance can be reduced.

  Further, this rolling bearing has a recess 50 that is recessed in the axial direction from the pocket inner surface 46 of the connecting portion 42, and a flocking portion 63 that cannot contact the rolling elements 30 disposed in the pocket 44 is provided on the recess 50. Therefore, in the recess 50 and the flocked portion 63, the lubricant is prevented from shearing with the rolling elements 30 in contact with the pocket inner surface 46, and the lubricant between the connecting portion 42 and the rolling elements 30 is avoided. The shear resistance can be reduced.

  Further, this rolling bearing is a tapered roller bearing in which the rolling element 10 is formed of a tapered roller, and of the small diameter side connecting portion 42 and the large diameter side connecting portion 43 of the cage 40, the small diameter side connecting portion 42. Since the flocked portion 63 is provided only on the surface of the roller, there is no recess for providing the flocked portion in the connecting portion 43 on the large diameter side, and the lubricant scraped on the end surface on the large diameter side of the rolling element 10 is scraped. You can avoid taking.

  A second embodiment of the present invention will be described with reference to FIG. In the following, only differences from the first embodiment will be described.

  A cage 70 shown in FIG. 4 is applied to a cylindrical roller bearing, a self-aligning roller bearing, or a ball bearing, and is formed by a recess 72 of a column portion 71 and a recess 74 of a connecting portion 73. It has a corner 75. The flocked portion 76 is provided on each corner 75. The shape of the column part 71 and the connection part 73 which form such a corner part 75 is generally adopted for the purpose of grinding relief and stress relaxation. In the second embodiment, the flocked portion 75 can be provided so as not to be in contact with the rolling elements (not shown) by using the corner portion 75, and the column portion 71 and the connecting portion 73 do not need to have a special shape.

  In the present invention, the number and shape of the recesses are not particularly limited. Further, the position of the flocked portion is not limited to the above-described embodiment, and may be on the surface of the retainer column portion or the connecting portion and in a non-contact position with the rolling element, and only the inner diameter surface of the column portion. It may be arranged in any other place such as the above-mentioned aspect, the aspect of only the outer diameter surface, the aspect of only the column part, the aspect of only the connecting part. Moreover, although the cage-type cage has been exemplified in the above-described embodiment, the flocked portion may be applied to other types of cages such as a crown-shaped cage, a corrugated cage, and a machined cage. Also, the bearing type is not particularly limited. For example, angular contact ball bearing, thrust ball bearing, needle roller bearing, thrust cylindrical roller bearing, thrust needle roller bearing, tapered roller bearing, thrust tapered roller bearing, self-aligning ball You may change into arbitrary forms, such as a bearing, a self-aligning roller bearing, a thrust self-aligning roller bearing, a one side or both sides seal, and one side or both sides open type.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. Accordingly, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

30 Rolling elements 40, 70 Cage 41, 71 Pillar portions 42, 43, 73 Connecting portion 44 Pocket 45, 46, 47 Pocket inner surface 48, 50, 72, 74 Recess 49 Inner diameter surface 60, 61, 62, 63, 76 Planted part 60a, 61a, 62a, 63a Fiber

Claims (7)

A predetermined number of rolling elements, and a cage for maintaining a circumferential interval between the rolling elements,
The retainer has a predetermined number of column portions arranged at predetermined intervals in the circumferential direction, and a connecting portion continuous on one axial side of these column portions,
The rolling elements are arranged in pockets between the column portions adjacent in the circumferential direction,
In the rolling bearing having the inner surface of the pocket that can contact the rolling elements arranged in the pocket, the column portion and the connecting portion,
The cage has a flocked portion made of a plurality of fibers planted on a surface other than the pocket inner surface of at least one of the pillar portion and the connecting portion,
The said hair transplant part is provided so that the rolling element arrange | positioned in the said pocket cannot contact, The rolling bearing characterized by the above-mentioned.   The rolling bearing according to claim 1, wherein the flocked portion is provided on an inner diameter surface of the column portion.   The rolling bearing according to claim 1 or 2, wherein the flocked portion is provided in a region having a larger diameter than the inner surface of the pocket of the pillar portion. The column part has a recess recessed in the circumferential direction from the pocket inner surface of the column part,
4. The rolling bearing according to claim 1, wherein the flocked portion is provided on a recess of the column portion. 5. The connecting portion has a recess recessed in the axial direction from the pocket inner surface of the connecting portion,
5. The rolling bearing according to claim 1, wherein the flocked portion is provided on a recess of the connecting portion. The connecting portion has a recess recessed in the axial direction from the pocket inner surface of the connecting portion,
5. The rolling bearing according to claim 4, wherein the flocked portion is provided on a corner formed by a recess of the column portion and a recess of the connecting portion. The rolling element consists of a tapered roller,
The retainer has the connecting portion on the small diameter side continuous with the small diameter side of the pillar portion, and the connecting portion on the large diameter side continuous with the large diameter side of the pillar portion,
The rolling bearing according to claim 5 or 6, wherein the flocked portion is provided only on a surface of the small-diameter-side connecting portion among the small-diameter-side connecting portion and the large-diameter-side connecting portion.

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