JP5872172B2 - Ball bearing cage and ball bearing - Google Patents

Description

  The present invention relates to a ball bearing cage made of synthetic resin that holds a ball so as to roll freely, and a ball bearing in which the cage is incorporated between an outer ring and an inner ring.

  As rolling bearings incorporated in automobile electrical parts and auxiliary parts such as fan coupling devices, alternators, idler pulleys, car air conditioner electromagnetic clutches, electric fan motors, etc., the rotating shaft that is driven to rotate by the engine output is used as a stationary member. Ball bearings such as deep groove ball bearings and angular contact ball bearings are widely used to support them rotatably.

  In general, as shown in FIG. 11, the ball bearing includes an inner ring 1, an outer ring 2, a ball 3 interposed between the inner ring 1 and the outer ring 2, and a cage 4 that holds the ball 3. Prepare. In some cases, a resin crown type cage is used as the cage. This resin crown type retainer 4 is made of a resin having excellent wear resistance, seizure resistance, and the like, and as shown in FIG. 12, a predetermined axially extending end surface 6 of the annular retainer body 5 is provided along the circumferential direction. While forming the recessed part 7 arrange | positioned by pitch and providing the pair of nail | claw parts 8 and 8 which protrude from the opening end which opposes the circumferential direction of this recessed part 7, the recessed part 7 and a pair of claw parts 8 and 8 A pocket 9 in which the ball 3 is stored is formed.

  Incidentally, a rolling bearing is required to have a low torque. Various types with low torque specifications have been proposed (Patent Document 1 and Patent Document 2). In Patent Document 1 and Patent Document 2, a cage is formed by fastening a pair of press forming plates with fastening means, and a pocket recess is provided on the inner surface of each press forming plate. A pocket into which a ball as a rolling element is fitted is formed in the recess. A recess or the like as a lubricant (grease) reservoir is provided on the inner surface of the pocket recess.

  Conventionally, in a crown-type cage, there is a crown-type cage that has a wide opening at both ends of the pocket and reduces the rotation resistance by reducing the facing area between the inner surface of the pocket and the rolling surface of the ball ( Patent Document 3).

JP 2003-13962 A JP 9-317775 A

  In Patent Document 1 and Patent Document 2, the sliding contact area between the ball and the pocket of the cage can be reduced, and the torque can be reduced. However, when grease is lubricated, the grease accumulates in the recess, and the grease always adheres to the ball. For this reason, grease is likely to be interposed between the ball 3 and the rolling surface of the inner ring and between the ball and the rolling surface of the outer ring, which may increase the torque.

  Further, in Patent Document 3, in order to extend the grease life of a bearing used under grease lubrication, a thin portion or the like is provided on the outer diameter surface side of the cage to enclose a large amount of grease. Moreover, the shape is such that the retained grease is supplied to the balls.

  For this reason, also in this patent document 3, like the said patent document 1 and the patent document 2, it will be in the state which grease will adhere to a ball | bowl, and there exists a possibility that a torque may increase. Moreover, this Patent Document 3 specializes only in rotation in one direction, and there is a restriction at the time of assembly and the like, which may increase man-hours.

Therefore, in view of such circumstances, the present invention intends to provide a ball bearing retainer and a ball bearing that can obtain a torque reduction effect by grease lubrication.

The first ball bearing retainer according to the present invention forms recesses disposed at a predetermined pitch along the circumferential direction on one end surface in the axial direction of the annular cage body, and faces the circumferential direction of the recess. A cage for ball bearings in which a pair of claw portions project from an open end and a pocket is formed to store a ball by the recess and the pair of claw portions, on the outer diameter surface side of the claw portion of the cage A scraping structure portion that scrapes off grease by contact or proximity with the ball, and the scraping structure portion is configured by a protrusion that projects from the outer diameter surface of the cage to the claw portion and protrudes to the outer diameter side. The inner surface of the protrusion is a surface extending to the outer diameter side with the same curvature as the inner surface of the pocket, and the protrusions are formed in pairs in each pocket, and the inner surface and the outer diameter surface of each protrusion. in arc-shaped edge portion is formed respectively, bearing axial extent of the projections bearing axis direction Of the range falls within the width of the bearing raceway surface interrupted at the other end surface side, and Ri outer peripheral surface radially outer surface concentric arcuate surfaces der of the holder body of the protrusion, the arc-shaped of the protrusion The excess grease adhered to the balls by scraping or contacting each edge portion with the balls is scraped off .

The second ball bearing retainer of the present invention forms recesses disposed at a predetermined pitch along the circumferential direction on one axial end surface of the annular retainer body, and faces the circumferential direction of the recess. A ball bearing retainer in which a pair of claw portions protrudes from an open end and a pocket is formed in which the ball is accommodated by the concave portion and the pair of claw portions, on the cage inner surface side of the claw portion, scraping structure for scraping grease by contact with or proximity with the ball provided, the scraping structure is composed of a projection portion projecting radially inward continuously from the cage inner diameter surface to the claw portion, the protrusion The inner surface of each protrusion is a surface extending to the inner diameter side with the same curvature as the inner surface of the pocket, and the projections are formed in pairs in each pocket, and the arc-shaped edge between the inner surface and the inner diameter surface of each projection parts are formed respectively, bearing axial extent of the projections bearing axis direction Of interrupted at the other side in the range falls within the width of the bearing raceway surface and the inner surface concentric with the holder body inner peripheral surface of the projection is arcuate surface der is, arc-shaped in the protrusion The excess grease adhered to the balls by scraping or contacting each edge portion with the balls is scraped off .

The third ball bearing retainer of the present invention forms recesses disposed at a predetermined pitch along the circumferential direction on one end surface in the axial direction of the annular cage body, and faces the circumferential direction of the recess. A cage for a ball bearing in which a pair of claw portions protrudes from an open end, and a pocket for storing a ball is formed by the concave portion and the pair of claw portions, the cage outer diameter surface side of the claw portion and A scraping structure for scraping grease by contact or proximity to the ball is provided on the inner diameter side of the cage, and the scraping structure on the outer diameter side is continuously connected to the claw from the outer diameter surface of the cage. It is composed of a protrusion on the outer diameter surface side that protrudes to the side, and the inner surface of the protrusion on the outer diameter surface side is a surface extending to the outer diameter side with the same curvature as the inner surface of the pocket, A pair of protrusions are formed in each pocket, and an arcuate error is formed between the inner surface and the outer diameter surface of the protrusion on the outer diameter surface side. Di portion are respectively formed, bearing axial range of the outer diameter surface side protrusion ranges fall within the width of the bearing raceway surface interrupted at the other end face side of the bearing axis and the outer diameter surface side projection The outer peripheral surface of the portion is a circular arc surface concentric with the outer diameter surface of the cage body, and the scraping structure portion on the inner diameter surface side projects from the cage inner diameter surface to the inner diameter side continuously from the claw portion. The inner surface of the protrusion on the inner diameter surface side is a surface extending toward the inner diameter side with the same curvature as the inner surface of the pocket, and a pair of protrusions on the inner diameter surface side are formed in each pocket. The inner surface and the inner surface of the protrusion on the inner diameter surface side each have an arcuate edge, and the bearing axial direction range of the protrusion on the inner diameter surface is interrupted on the other end surface side in the bearing shaft direction. Within the width of the surface, and the inner peripheral surface of the protrusion is the inner diameter surface of the cage body Ri arcuate surface der concentric, in which scrape excess grease adhering to the balls by the contact or proximity of the arc-shaped ball each edge portion of the protrusion.

  According to the ball bearing retainer of the present invention, the scraping structure portion is provided, whereby the grease adhering to the ball can be scraped off from the ball. For this reason, it is preferably used under grease lubrication.

  A grease reservoir can be provided on the inner diameter side and / or outer diameter side between adjacent pockets along the circumferential direction on the one axial end surface side where the claw portion of the cage body is provided.

  A grease reservoir can be provided on the inner diameter side and / or the outer diameter side between adjacent pockets along the circumferential direction on the other axial end surface side of the cage main body not having the claw portion.

  Thus, by providing the grease reservoir, the grease is accumulated in the grease reservoir, and the flow of grease to the rolling surface of the rolling element (ball) can be reduced. Thereby, the stirring resistance of grease can be reduced.

  Polyamide resin can be used for the cage material. The polyamide resin may be PA66 (polyamide 66), PA46 (polyamide 46), PA9T (polyamide 9T), PA11 (polyamide 11), or PA6 (polyamide 6). . For this reason, this cage is excellent in elongation, tensile strength, impact resistance, wear resistance, lubricity and the like.

A ball bearing according to the present invention includes an inner ring, an outer ring, a ball interposed between the inner ring and the outer ring, and a cage that holds the ball. The ball bearing includes the ball bearing. A cage is used.

Ball bearing cage of the present invention, it is possible to scrape from the grease ball adhering to the ball, the excess lubricant present between the pocket and ball (grease) can be quickly removed. As a result, it is possible to reduce the shearing resistance of the lubricant, it is easy to reduce the torque generated between the cage and the ball by shearing resistance of the lubricant. As a result, it is possible to easily provide a ball bearing for automobiles that is suitable for environmental problems such as fuel efficiency improvement in recent years.

  By providing the grease reservoir, the agitation resistance of the grease can be reduced and the torque can be further reduced.

  As the cage material, a polyamide resin excellent in tensile elongation, tensile strength, impact resistance, wear resistance, lubricity and the like can be used, and a high-quality cage can be provided.

  The ball bearing of the present invention can provide a ball bearing capable of reducing torque. For this reason, it is optimal as a ball bearing incorporated in an alternator, an idler pulley, a tensioner pulley, a car air conditioner compressor, a pulley with an electromagnetic clutch of a car air conditioner compressor, and the like.

It is sectional drawing of the ball bearing which shows embodiment of this invention. It is a top view of the cage of the ball bearing. It is a principal part expanded sectional view of the said ball bearing. It is a principal part simplified plan view of the said ball bearing. It is a perspective view which shows the relationship between a holder | retainer and a ball | bowl. It is a simplified development view of a cage provided with a grease reservoir on the side having a claw portion. The cage having the grease reservoir on the side having the claw portion is shown, (a) is a simplified plan view of the main part of the cage having the grease reservoir on the inner diameter side, and (b) is the grease reservoir on the outer diameter side. It is a principal part simplified top view of the holder | retainer provided with. It is a simplified development view of a cage in which a grease reservoir is provided on the side having no claw portion. The cage having a grease reservoir on the side not having the claw portion is shown, (a) is a simplified plan view of the main part of the cage having the grease reservoir on the inner diameter side, and (b) is on the outer diameter side. It is a principal part simplified plan view of the holder | retainer provided with the grease reservoir. It is a graph which shows the torque measurement result of a conventional product and this invention product. It is sectional drawing of the conventional ball bearing. It is a principal part perspective view of the conventional cage for ball bearings.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a ball bearing according to the present invention. This ball bearing retainer is an electric component or auxiliary component of an automobile, such as a fan coupling device, an alternator, an idler pulley, an electromagnetic clutch for a car air conditioner, an electric motor It is built into a fan motor.

The ball bearing 20 of this embodiment includes an inner ring 22 having an inner rolling surface 22a formed on the outer peripheral surface, and an outer ring 23 disposed outside the inner ring 22 and having an outer rolling surface 23a formed on the inner peripheral surface. , A plurality of balls (balls) 24 interposed between the inner rolling surface 22a of the inner ring 22 and the outer rolling surface 23a of the outer ring 23, and the inner ring 22 and the outer ring 23. A cage 25 that holds the balls 24 at equal intervals in the circumferential direction, and a seal member that is disposed on both sides in the axial direction between the inner ring 22 and the outer ring 23 and seals an annular space 27 formed between the inner ring 22 and the outer ring 23. 26 constitutes a main part. By encapsulating the lubricant such as grease into the annular space 27 which is sealed by the sealing member 26, the ball 24 in the pocket of the cage 25 is adapted to roll smoothly.

  In this embodiment, the outer ring 23 is attached to a stationary member such as a housing, and the inner ring 22 is attached to a rotating shaft that is rotationally driven by engine output. The seal member 26 includes an annular cored bar 26a and a rubber-like member 26b that is integrally fixed to the cored bar 26a, and the outer peripheral portion is fitted in a seal mounting groove 29 formed on the inner peripheral surface of the outer ring 23. Fixed to state. The inner ring 22 has a seal groove 30 formed of a circumferential groove at a position corresponding to the inner peripheral portion of the seal member 26, and a seal lip 31 formed at the inner peripheral side end of the seal member 26 is a seal groove 30 of the inner ring 1. Slid in contact. In this embodiment, the inner ring rotation type is illustrated, but the present invention can also be applied to an outer ring rotation type in which the inner ring 22 is mounted on a stationary member such as a shaft and the outer ring 23 is mounted on a rotation shaft.

During the operation of the ball bearing 20, the inner ring 22 rotates while maintaining the state in which the seal lip 31 at the tip of the seal member 26 is in sliding contact with the outer peripheral end of the inner ring 22. Accordingly, or foreign substances water or dusts from entering into the bearing, or lubricant so as to prevent that or leaked to the outside from the bearing.

  As shown in FIGS. 2 to 5, the retainer 25 includes an annular retainer body 35 in which concave portions 37 are formed on the axial end surface 36 at a predetermined pitch along the circumferential direction, and the retainer And a claw portion 38 projecting from an opening end facing the circumferential direction of the concave portion 37 of the main body 35. The recess 37 and the pair of claws 38 projecting from the open end constitute a pocket 39 for holding the ball 24. Further, a groove 45 is provided on the other axial end surface 40.

The cage 25 is a resin of this type that is generally used in abrasion resistance and seizure resistance, such as polyethylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, and polyethersulfone. , Polyetherimide, polyamideimide, polyetheretherketone, thermoplastic polyimide, thermosetting polyimide, epoxy resin, phenol resin and the like. Furthermore, based on a thermoplastic resin such as polyamide, polyphenylene sulfide, or polyether ether ketone, a glass fiber added to improve strength and dimensional stability can be used.

  However, in the present invention, it is preferable to use a polyamide resin excellent in tensile elongation, tensile strength, impact resistance, wear resistance, lubricity and the like as the cage material of the cage 25. The polyamide resin may be PA66 (polyamide 66), PA46 (polyamide 46), PA9T (polyamide 9T), PA11 (polyamide 11), or PA6 (polyamide 6). . Thus, in the present invention, a polyamide resin excellent in tensile elongation, tensile strength, impact resistance, wear resistance, lubricity, etc. can be used as the cage material, and a high-quality cage can be provided. . In addition, the outer ring | wheel 23, the inner ring | wheel 22, and the ball | bowl 24 are formed, for example with metals, such as bearing steel and carburized steel.

  The grease filled in the ball bearing is a semi-solid lubricant composed of a base oil, a thickener and an additive. Examples of the base oil constituting the lubricating grease include mineral oils such as paraffinic mineral oil and naphthenic mineral oil, hydrocarbon synthetic oils such as polybutene, poly-α-olefin, alkylbenzene, alkylnaphthalene, and alicyclic compounds, or Natural oils and fats, polyol ester oils, phosphate esters, diester oils, polyglycol oils, silicone oils, polyphenyl ether oils, alkyl diphenyl ether oils, non-hydrocarbon synthetic oils such as fluorinated oils, etc. Any oil that is used can be used without particular limitation.

  Examples of the thickener include metal soap-based thickeners such as aluminum soap, lithium soap, sodium soap, composite lithium soap, composite calcium soap, composite aluminum soap, and urea compounds such as diurea compounds and polyurea compounds. . These thickeners may be used alone or in combination of two or more.

  Known additives for lubricating greases include, for example, extreme pressure agents, amine-based and phenol-based antioxidants, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, and molybdenum disulfide. And solid lubricants such as graphite. These can be added alone or in combination of two or more.

  A scraping structure portion 50 is provided on the outer diameter surface side of the claw portion 38 to scrape off the grease by contact or proximity to the ball 24. That is, the outer diameter surface 25 a is provided with a protruding portion 51 that continues to the claw portion 38, and the protruding portion 51 constitutes the scraping structure portion 50. Here, the proximity means that the ball 24 is not in contact with the ball 24 but is located within a range where the ball 24 can be scraped off.

  The protruding portion 51 has the same shape as the claw portion 38, a distal end portion 51 a that protrudes further to the outer diameter side than the outer diameter surface 25 a on the opposite end side in the axial direction from the one axial end surface 36, and an outer diameter It consists of the base end part 51b which protrudes in the outer diameter side rather than the surface 25a (refer FIG. 5). Then, when the arc-shaped edge portions 51 c and 51 c of the protrusion 51 contact or approach the ball 24, the grease attached to the ball 24 is scraped off.

  Further, in the above embodiment, the scraping structure portion 50 for scraping the grease by contact or proximity to the ball 24 is provided on the outer diameter surface side of the retainer of the claw portion 38, but as indicated by the phantom line in FIG. In addition, such a scraping structure portion 50 may be provided on the side of the cage inner diameter surface 25b of the claw portion 38. When the scraping structure 50 is provided on the cage inner surface, it may be provided only on the cage inner surface or on the cage inner surface and the outer surface.

  In the ball bearing retainer of the present invention, the scraping structure 50 is provided, so that the grease adhering to the ball 24 can be scraped off from the ball 24. That is, excess lubricant (grease) existing between the pocket 39 and the ball 24 can be quickly removed. As a result, the shear resistance of the lubricant can be reduced, and the torque generated between the cage 25 and the ball 24 can be easily reduced by the shear resistance of the lubricant. As a result, it is possible to easily provide a ball bearing for automobiles that is suitable for environmental problems such as fuel efficiency improvement in recent years. For this reason, it is preferably used under grease lubrication.

  In particular, when the protrusion 51 is provided as in this embodiment, the distance between the rolling surface 23a of the outer ring 23 and the cage 25 is reduced, and the grease can be scraped quickly. That is, the grease adhering to the ball 24 can be scraped off at an earlier stage by the amount of the protrusion of the protrusion 51. Thus, if the grease can be scraped off quickly, the amount of grease adhering to the ball 24 is reduced accordingly, so that a lower torque can be achieved.

  Moreover, in the said embodiment, since the groove | channel 45 for the thinning is provided in the axial direction other end surface 40, the cooling rate at the time of cage | basket | molding is equalized, and a void (cavity made inside the molded product) or sink ( There are effects such as prevention of occurrence of shrinkage strain and warpage appearing on the outer surface of the molded product.

  Incidentally, the retainer 25 is preferably provided with a grease reservoir 60 for collecting the grease scraped off at the pocket edge portion 41 as shown in FIG. The grease reservoir 60 is formed of a concave portion and is provided between the pockets 39 adjacent in the circumferential direction on the axial one end face 36 side of the cage body 35 where the claw portion 38 is provided. In this case, it may be provided on the inner diameter surface 25b side as shown in FIG. 7 (a), or may be provided on the outer diameter surface 25a side as shown in FIG. 7 (b). Furthermore, although not shown in the drawings, the inner diameter surface 25b and the outer diameter surface 25a may be provided.

  In FIG. 8, it is provided between the pockets 39 adjacent to each other in the circumferential direction on the side of the other axial end surface 40 side of the cage main body 35 where the claw portion 38 is not provided. Also in this case, it may be provided on the inner diameter surface 25b side as shown in FIG. 9A or may be provided on the outer diameter surface 25a side as shown in FIG. 9B. Furthermore, although not shown in the drawings, the inner diameter surface 25b and the outer diameter surface 25a may be provided.

  Thus, by receiving the grease reservoir 60, the grease is accumulated in the grease reservoir 60, and the flow of grease to the rolling surfaces 22a and 23a of the rolling elements (balls) 24 can be reduced. Thereby, the stirring resistance of the grease can be reduced, and the torque can be further reduced.

  By the way, the size of the grease reservoir 60 can be variously changed according to the size of the cage itself, the material used, and the like. In this case, if it is too large, it will be inferior in strength, and if it is too small, the amount of grease will be small, and the grease flow to the rolling surfaces 22a, 23a cannot be reduced. For this reason, it can change variously in the range which is not inferior in strength and can reduce grease flow.

  In the ball bearing of the present invention using the cage 25, it is possible to provide a ball bearing that can obtain a torque reduction effect by grease lubrication. For this reason, it is optimal as a ball bearing incorporated in a fan coupling device, an alternator, an idler pulley, an electromagnetic clutch for a car air conditioner, an electric fan motor, or the like.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the number of pockets 39 for holding the ball 24 may be the number of the pockets 39. Although the number is 7 in the form, the number can be arbitrarily increased or decreased. In addition, when the grease reservoir 60 is provided, it is provided between the pockets 39 adjacent to each other in the circumferential direction regardless of whether it is provided on the inner diameter side or the outer diameter side of the cage. Alternatively, it may be provided between any pockets 39. The proximity of the scraping structure 50 to the ball 24 is not limited as long as the grease adhering to the ball 24 can be scraped off as described above, and various changes can be made depending on the type of grease and the bearing size. it can. Further, it is not necessary to completely scrape off the grease adhering to the ball 24, and the contact range and proximity range in the scraping structure portion 50 can be variously changed within a range that does not hinder (a range in which a torque reduction effect can be obtained).

  The cage 25 may be made of metal such as carbon steel, spring steel, and stainless steel. The metal cage 4 is formed by cutting or the like. As in the above embodiment, the resin cage 4 is molded by injection molding or the like.

  Next, as shown in FIG. 1 and the like, a ball bearing (the product of the present invention) is provided with a scraping structure portion 50 that scrapes grease by contact or proximity to the ball 24 on the outer diameter surface side of the cage 38. ) And a ball bearing (conventional product) using a conventional cage that does not have such a scraping structure 50. NTN 6203LLB was used as the bearing. The rotation speed was 10,000 r / min, the load Fa was 29.4 N, and the ambient temperature was room temperature. The torque measurement results are shown in FIG. As can be seen from FIG. 10, the product of the present invention can obtain a torque reduction effect by grease lubrication.

20 Ball bearing 22 Inner ring 23 Outer ring 24 Ball 25 Cage 25a Cage outer diameter surface 25b Cage inner diameter surface 35 Cage body 36 Axial one end surface 37 Recess 38 Claw portion 39 Pocket 40 Axial other end surface 50 Scraping structure portion 60 Grease reservoir

Claims (12)

Forming a recess disposed at a predetermined pitch along the circumferential direction on one axial end surface of the annular cage body, and projecting a pair of claws from an opening end facing the circumferential direction of the recess, A ball bearing retainer in which a pocket for storing a ball is formed by the recess and the pair of claws,
A scraping structure portion for scraping grease by contact or proximity to the ball is provided on the cage outer diameter surface side of the claw portion, and the scraping structure portion has an outer diameter continuously from the cage outer diameter surface to the claw portion. The inner surface of the protrusion is a surface extending to the outer diameter side with the same curvature as the inner surface of the pocket, and the protrusions are formed in pairs in each pocket, Arc-shaped edge portions are formed on the inner surface and outer diameter surface of each protrusion, respectively, and the bearing axial direction range of the protrusion is a range that is interrupted on the other end surface side in the bearing axis direction and is within the width of the bearing raceway surface. and, arcuate surface der the outer surface concentric with the holder body outer peripheral surface of the protrusion is, excess grease adhering to the balls arcuate respective edge portions of the projections by contact or close the ball Ball bearing retainer characterized by scraping . Forming a recess disposed at a predetermined pitch along the circumferential direction on one axial end surface of the annular cage body, and projecting a pair of claws from an opening end facing the circumferential direction of the recess, A ball bearing retainer in which a pocket for storing a ball is formed by the recess and the pair of claws,
A scraping structure for scraping grease by contact with or close to the ball is provided on the inner diameter side of the retainer of the claw, and the scraping structure protrudes from the inner diameter of the cage to the inner diameter side continuously to the claw. The inner surface of the protrusion is a surface extending to the inner diameter side with the same curvature as the inner surface of the pocket, and the protrusions are formed in pairs in each pocket. Arc-shaped edge portions are formed on the inner surface and the inner diameter surface, respectively, and the bearing axial direction range of the protruding portion is a range that is interrupted on the other end surface side in the bearing axial direction and is within the width of the bearing raceway surface, and the protruding portion arc face der inner peripheral surface of the inner surface concentric with the retainer body is, and characterized by scraping the excess grease adhering to the balls arcuate edge portion of the protrusion by contact or close the ball Ball bearing cage. Forming a recess disposed at a predetermined pitch along the circumferential direction on one axial end surface of the annular cage body, and projecting a pair of claws from an opening end facing the circumferential direction of the recess, A ball bearing retainer in which a pocket for storing a ball is formed by the recess and the pair of claws,
On the outer diameter side of the cage and the inner diameter side of the cage, there is a scraping structure that scrapes off grease by contact with or close to the ball, and the scraping structure on the outer diameter side is the outer diameter surface of the cage. From the outer diameter surface of the protrusion, and the inner surface of the protrusion on the outer diameter surface extends to the outer diameter side with the same curvature as the inner surface of the pocket. A pair of protrusions on the outer diameter surface side are formed in each pocket, and arc-shaped edge portions are formed on the inner surface and the outer diameter surface of the protrusion portion on the outer diameter surface side. The range in the bearing axial direction of the projection on the radial surface side is a range that is interrupted on the other end surface side in the bearing axial direction and fits within the width of the bearing raceway surface, and the outer peripheral surface of the projection on the outer radial surface side is the cage body The scraping structure part on the inner diameter side is continuous from the inner diameter surface of the cage to the claw part. Is constituted by projections of the inner diameter side protruding radially inner surface of the protrusion of the inner surface side is a surface that extends radially inward at the inner surface and the same curvature of the pocket, the inner diameter side protruding portion Are formed in pairs in each pocket, and arc-shaped edge portions are respectively formed on the inner surface and the inner surface of the protrusion on the inner surface , and the bearing axial direction range of the protrusion on the inner surface is in the bearing axial direction. ranges fall within the width of the bearing raceway surface interrupted at the other end surface side, and arcuate surface der the inner surface concentric with the inner circumferential surface the holder body of the projecting portion of the inner surface side is, the protrusion A ball bearing retainer which scrapes off excess grease adhering to a ball by contact or proximity of the arc-shaped edge portion with the ball .   The ball bearing retainer according to any one of claims 1 to 3, wherein the ball bearing retainer is used under grease lubrication.   The grease reservoir is provided on the inner diameter side between adjacent pockets along the circumferential direction on one axial end surface side where the claw portion of the cage body is provided. The ball bearing retainer according to item.   The grease reservoir is provided on the outer diameter side between adjacent pockets along the circumferential direction on one axial end surface side where the claw portion of the cage body is provided. The ball bearing retainer according to item 1.   5. A grease reservoir is provided on an inner diameter side and an outer diameter side between adjacent pockets along the circumferential direction on one axial end surface side where the claw portion of the cage body is provided. The ball bearing retainer according to any one of the above.   5. The grease reservoir according to claim 1, wherein a grease reservoir is provided on an inner diameter side between adjacent pockets along the circumferential direction on the other axial end surface side of the cage body that does not have a claw portion. The ball bearing retainer according to item 1.   5. The grease reservoir according to claim 1, wherein a grease reservoir is provided on an outer diameter side between adjacent pockets along the circumferential direction on the other axial end side surface of the cage body that does not have a claw portion. The ball bearing retainer according to claim 1.   The grease reservoir is provided on the inner diameter side and the outer diameter side between adjacent pockets along the circumferential direction on the other axial end surface side of the cage body that does not have the claw portion. The ball bearing retainer according to any one of 4.   The ball bearing cage according to any one of claims 1 to 10, wherein a polyamide resin is used as a cage material.   A ball bearing comprising an inner ring, an outer ring, a ball interposed between the inner ring and the outer ring, and a cage for holding the ball, wherein the cage is any one of claims 1 to 11. A ball bearing using the ball bearing cage according to claim 1.

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