JP2020128786A - Retainer for rolling bearing, and rolling bearing - Google Patents

Abstract

To provide a retainer for a rolling bearing made of resin capable of reducing rotary torque of a rolling bearing without changing grease, seals, and the like, and to provide a rolling bearing having the retainer.SOLUTION: A retainer 1 is a crown retainer that has plural pockets 4 open to one axial side on an annular retainer body 2 and rollably retains balls by the pockets 4. The retainer 1 has a first well part 6a and a second well part 6b for accumulating grease in each of a pocket opening side and a pocket non-opening side between the pockets 4 that are adjacent in a circumferential direction. In the first well part 6a, an inner-diameter side is open and an outer-diameter side is closed by a first wall part 7a. In the second well part 6b, an inner-diameter side is open and an outer-diameter side is closed by a second wall part 7b. At least one of the first wall part 7a and the second wall part 7b has a diameter-reduced portion in which the diameter is reduced toward outside in an axial direction of the retainer 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cage for a rolling bearing made of resin and a rolling bearing using the cage.

The rolling bearing is generally composed of an inner ring, an outer ring, rolling elements, and a cage. A seal member may be provided at the opening end in order to prevent foreign matter from entering from the outside or to prevent the lubricant enclosed in the inside from flowing out. Grease is often used as the lubricant inside the bearing. Grease is easy to handle and the design of the sealing device can be simplified. In addition, the grease does not need to be re-supplied and has excellent maintainability. However, in the case of grease lubrication with grease sealed in the bearing, the friction torque increases and the heat associated therewith increases due to the stirring resistance that the balls and the cage stir the grease and the shear resistance that shears the grease between the balls and the cage. It is known to occur. As techniques for reducing friction torque and the like, techniques such as those in Patent Documents 1 to 3 have been conventionally proposed.

Patent Document 1 discloses a technique for improving lubrication characteristics by changing a lubricant, which is excellent in peeling resistance and grease leakage, and which can suppress early seizure even when used in an outer ring rotary bearing. As the product, one containing a predetermined ester oil and a diurea compound in a predetermined blending amount is described.

In Patent Document 2, in order to reduce the rotational torque of the bearing by changing the shape of the cage, it is composed of two annular holding plates formed by a steel plate press, and a polygonal pocket or the like is formed. A deep groove ball bearing with a cage is described.

In Patent Document 3, similarly, in order to reduce the rotational torque of the bearing by changing the shape of the cage, a crown-shaped cage in which the edge portion of the pocket is structured to scrape off the lubricant by line contact with balls Is listed. The radius R of the conventional pocket-shaped cage made of resin is large relative to the balls to be held. Therefore, the balls are in contact with the central portion (pocket surface) in the radial direction of the cage. In that case, the grease adhering to the ball surface moves back and forth between the pocket surface and the ball surface during the bearing operation, and is in a state of being constantly stirred. On the other hand, in the cage of Patent Document 3, the radius R of the pocket in the radial direction is smaller than that of the ball to be held, and the ball and the edge portion of the pocket are brought into contact with each other to reduce the torque. By scraping the grease adhering to the ball surface at the edge of the cage pocket, the shear resistance of the grease is reduced and the rotational torque of the bearing is reduced.

Japanese Patent No. 3330755 JP, 2007-292195, A JP, 2012-31914, A

Patent Document 1 improves lubrication characteristics by improving an enclosed grease. However, when a semi-solid lubricant such as grease is used as it is, torque is increased due to stirring resistance caused by the lubricant. .. In rolling bearings used in automobiles and industrial equipment in recent years, in order to save energy, it is an important issue to reduce torque while ensuring a sufficient lubricating life.

To solve this problem, it is possible to reduce the torque by using a cage having a special shape as disclosed in Patent Document 2. Further, the torque can be reduced by optimizing the grease type and reducing the grease filling amount itself. However, these increase the manufacturing cost and shorten the bearing life. Therefore, the lubrication characteristics are improved (especially the rotation torque is reduced) without largely changing the bearing shape, grease type, and grease filling amount from the existing products. Technology development is desirable.

The resin-made cage cage of Patent Document 3 can reduce the torque with a relatively simple structure as described above. However, with this structure, although grease shear resistance in the gap between the ball and the pocket can be reduced, reduction in grease stirring resistance cannot be expected. In particular, when the amount of grease supplied is larger than the amount of scraped grease, such as when the amount of grease enclosed is large, the effect of the stirring resistance of the grease is a concern.

The present invention has been made in view of the above circumstances, and is a resin rolling bearing retainer capable of reducing the rotational torque of the rolling bearing without changing grease or seals, and the retainer. An object of the present invention is to provide a rolling bearing provided with.

The rolling bearing cage of the present invention is a resin rolling bearing cage, which comprises a plurality of pockets opened on one side in the axial direction on an annular cage body, Is a crown-shaped cage for rotatably holding balls, and the cage has a first reservoir portion for storing grease on the pocket opening side and a pocket non-opening side between the pockets adjacent to each other in the circumferential direction. The first reservoir has an inner diameter side opened and the outer diameter side closed by a first wall portion, and the second reservoir portion has the inner diameter side opened and the outer diameter side has a second wall portion. It is characterized in that at least one of the first wall portion and the second wall portion has a reduced diameter portion that reduces in diameter toward the outside in the axial direction of the retainer.

The reduced diameter portion is an inclined surface that is continuously inclined with respect to a surface orthogonal to the axial direction. Further, it is characterized in that turning, grinding, or electric discharge machining is formed on the surface of the reduced diameter portion.

The pocket radius is characterized in that the pocket radius is smaller than the radius of the ball.

A connecting portion that connects the outer wall portions of the adjacent pockets is provided between the adjacent pockets, and the first storing portion and the second storing portion are partitioned by the connecting portion, and the shaft of the cage is formed. The height of the first wall portion in the direction is smaller than the height of the second wall portion in the axial direction of the cage.

A rolling bearing including an inner ring and an outer ring, balls that are a plurality of rolling elements interposed between the inner ring and the outer ring, a cage that holds the balls, and grease that is sealed in the bearing inner space. The cage is the cage for rolling bearings according to the present invention, and the amount of grease filled in the rolling bearing is 65% to 100% of the stationary space volume of the bearing internal space.

The rolling bearing cage of the present invention is a crown-shaped cage having a plurality of pockets for holding balls that are opened on one side in the axial direction on a resin-made cage body, and between adjacent pockets. , The pocket opening side and the pocket non-opening side respectively have a first reservoir part and a second reservoir part for storing grease, and the outer diameter side of each of the first reservoir part and the second reservoir part is closed by a wall part. Therefore, a large amount of grease can be accumulated in the cage itself when the bearing rotates, and the flow of grease to the raceway surface of the rolling elements (balls) can be reduced. This can reduce the stirring resistance of the grease.

Furthermore, since at least one of the first wall portion and the second wall portion has a reduced diameter portion that reduces in diameter toward the outside in the axial direction of the cage, the grease accumulated in the accumulation portion is prevented from scattering due to centrifugal force. As a result, the stirring resistance of the grease can be further reduced.

Since turning, grinding, or electric discharge machining is formed on the surface of the reduced diameter portion, the grease holding power can be improved.

Since the pocket radius is smaller than the radius of the ball, the pocket comes into contact with the ball at the inner and outer diameter surface edge portions of the pocket. Therefore, the grease adhering to the ball surface can be scraped off at the edge portion, and the shear resistance of the grease between the pockets can be reduced. In this way, by combining the first storage part between the holding claws, the second storage part which is a recessed part of the inner diameter surface of the retainer, and the scraping structure at the edge part of the pocket, compared to the individual techniques. More excellent low torque can be expressed.

The rolling bearing of the present invention includes the rolling bearing retainer and the grease filled in the bearing inner space, and since a large amount of grease can be stored in the retainer itself, the grease filling amount is the bearing inner space. Even if it is 65% to 100% of the stationary space volume, the stirring resistance of grease can be reduced and it can be suitably used.

It is a front view etc. of the cage for rolling bearings which concerns on one Example of this invention. It is a development view of the cage of FIG. It is a partial cross section figure of the axial direction between the pockets of the holder of FIG. It is sectional drawing (schematic) of the thickness direction of a holder. It is a partial cross-sectional view of a rolling bearing according to an embodiment of the present invention.

An example of the rolling bearing cage of the present invention will be described with reference to FIG. FIG. 1(a) is a front view of an example of the cage of the present invention, and FIG. 1(b) is a perspective view thereof. The cage 1 of the present invention is a resin-made cage, and retains balls, which are rolling elements in a rolling bearing, at equal intervals in the circumferential direction. As shown in FIG. 1A, the outer diameter surface of the cage 1 is a curved surface without steps. The cage 1 has an outer diameter surface and an inner diameter surface which communicate with each other at the pocket 4.

As shown in FIG. 1B, the cage 1 has a pair of holding claws 3 formed on an annular cage body 2 with a constant pitch in the circumferential direction, and the holding claws 3 facing each other are mutually formed. It is bent in the direction of approaching, and a pocket 4 for holding balls as rolling elements is formed between the holding claws 3. A connecting portion 5 that connects the outer wall portions of the pockets is provided between the adjacent pockets in FIG.

The cage 1 of the present invention has a first reservoir portion 6a and a second reservoir portion 6b for retaining grease on the pocket opening side and the pocket non-opening side between the pockets that are circumferentially adjacent to each other. As shown in FIG. 1, the first reservoir 6a is open on the pocket opening side (one side in the axial direction) and the inner diameter side, and the outer diameter side is closed by the first wall portion 7a. The first wall portion 7 a is provided so as to connect the back surfaces of the adjacent holding claws 3 formed on the edges of the adjacent pockets 4 to each other and to stand up from the connecting portion 5 in the axial direction. The first wall portion 7a does not protrude from the outer diameter surface of the cage, and the outer peripheral surface thereof forms a part of the outer diameter surface of the cage 1 having a substantially cylindrical shape. The first reservoir portion 6a is surrounded by the first wall portion 7a of the retainer main body 2, the holding claws 3 that are adjacent to each other between the pockets, and the connecting portion 5 so as to be able to hold grease.

The second reservoir portion 6b is open on the pocket non-opening side (the other side in the axial direction) and the inner diameter side, and the outer diameter side is closed by the second wall portion 7b. The outer peripheral surface of the second wall portion 7b is continuous with the outer peripheral surface of the first wall portion 7a and forms a part of the outer diameter surface of the cage 1. The second reservoir portion 6b is surrounded by the second wall portion 7b of the cage main body 2, the spherical outer wall portion 4a of the adjacent pocket 4, and the connecting portion 5 so as to be able to retain grease.

Here, the conventional general rolling bearing cage does not have a grease reservoir capable of retaining grease. Specifically, a wall portion that connects the back surfaces of the holding claws, such as the first wall portion 7a in FIG. 1, is not provided, and a retainer such as the second reservoir portion 6b in FIG. There is also no concave portion recessed from the inner diameter surface of the. On the other hand, in the cage 1 of the present invention, the wall portion (first wall portion 7a) is formed on the outer diameter side between the adjacent pockets to provide the first reservoir portion 6a, and the inner diameter surface has the concave portion (second wall portion). A reservoir 6b) is provided. In this way, by providing grease reservoirs on both sides of the cage in the axial direction, a large amount of grease can be retained when the bearing rotates, and the grease flow to the raceways of the rolling elements (balls) is reduced. You can

When viewed from the inner diameter surface of the cage 1, each of the reservoir portions 6a and 6b is a recess having a bottom portion (first wall portion 7a, second wall portion 7b). When the bearing is rotated, the cage 1 is rotated while the grease is held in the reservoirs 6a and 6b, so that the grease can be prevented from scattering due to centrifugal force.

FIG. 2 shows a development view of the cage of FIG. 1 as viewed from the inner diameter side. As shown in FIG. 2, the pocket 4 and the first reservoir 6a are not in communication with each other, and the pocket 4 and the second reservoir 6b are not in communication with each other. Therefore, it is possible to prevent the grease from flowing out from the reservoirs 6a and 6b to the raceway surface. Further, the second storage portions 6b adjacent to each other in the circumferential direction are not communicated with each other, and are partitioned by the thick portion 4b provided on the outer wall portion 4a of the pocket 4. Since the cage of the present invention is provided with the second pool portion 6b which can be said to be a meat thin portion, it is feared that the centrifugal strength is reduced as compared with a general crown cage, but the thick wall portion 4b is By providing it, it is possible to suppress a decrease in centrifugal strength. As shown in FIG. 2, the thick portion 4 b is preferably provided on the back side of the bottom of the pocket 4.

FIG. 3 shows an axial cross-sectional view (cross-sectional view taken along the line AA′) of the cage of FIG. 1 between the pockets. As shown in FIG. 3, the first wall portion 7a has a diameter-reduced portion 8a whose diameter is reduced outward in the axial direction of the cage. The reduced diameter portion 8a, the radial thickness W _a of the first wall portion 7a, axially outer becomes larger than the axially inner side. Further, the second wall portion 7b has a reduced diameter portion 8b that is reduced in diameter toward the axially outer side on the side opposite to the reduced diameter portion 8a. The reduced diameter portion 8b, the radial thickness W _b of the second wall portion 7b is toward the axial outer side is larger than the axial inner side.

As shown in FIG. 3, the first reservoir portion 6a and the second reservoir portion 6b are partitioned by a flat plate-shaped connecting portion 5 in the axial direction. In this case, the height H _a of the first wall portion 7 a in the axial direction of the cage 1 is preferably smaller than the height H _b of the second wall portion 7 b in the axial direction of the cage 1.

In FIG. 3, the reduced diameter portion 8a and the reduced diameter portion 8b are inclined surfaces that are continuously inclined with respect to the surface orthogonal to the axial direction. As shown in FIG. 3, the inner peripheral surface of the first wall portion 7a is inclined radially inward, and the inner peripheral surface of the second wall portion 7b is inclined radially inward. Compared to the case where the inclined surface is not provided (for example, a vertical surface), the grease held in the grease reservoir can be prevented from being scattered by centrifugal force, and the stirring resistance of the grease can be reduced.

As the structure of the diameter-reduced portion 8a, specifically, an angle θ _a formed by a surface orthogonal to the axial direction (the surface of the connecting portion 5 in FIG. 3) and the inner peripheral surface of the first wall portion 7a is less than 90°. It is preferably 45° or more and less than 90°, more preferably 60° or more and less than 90°, and further preferably 70° or more and 85° or less. Similarly, as the structure of the diameter-reduced portion 8b, specifically, an angle θ _b formed by a surface orthogonal to the axial direction (the surface on the opposite side of the connecting portion 5 in FIG. 3) and the inner peripheral surface of the second wall portion 7b. Is less than 90°, preferably 45° or more and less than 90°, more preferably 60° or more and less than 90°, and still more preferably 70° or more and 85° or less. If reduced diameter portion 8a and the reduced diameter portion 8b is an inclined surface either, but the magnitude relationship of the angle theta _a and the angle theta _b is not particularly limited, it is preferred angle theta _a and the angle theta _b are the same.

Further, while ensuring the centrifugal strength of the cage 1, reservoir 6a, to enhance the grease retention by increasing the volume of 6b, the thickness W _a is 10 to 50% of the radial thickness W of the cage It is preferably in the range. More preferably, it is in the range of 15 to 40%. The thickness _{W b} likewise is preferably in the range from 10 to 50% of the radial thickness W of the cage, and more preferably in the range of 15% to 40%. Further, as shown in FIG. 3, the maximum thickness of the thickness W _b, more preferably greater than the maximum thickness of the thickness W _a.

The configuration of the cross-sectional view taken along the line A-A′ of the cage 1 in FIG. 1 described above is not limited to the configuration of FIG. 3. In FIG. 3, the diameter-reduced portion is an inclined surface that is continuously inclined with respect to the surface orthogonal to the axial direction, but the diameter may be reduced stepwise (non-continuously). In this case, a step can be provided on the inner peripheral surface of the wall portion, the diameter of which decreases outward in the axial direction. Further, in the configuration of FIG. 3, the reduced diameter portion is provided on both the first wall portion 7a and the second wall portion 7b, but the reduced diameter portion may be provided on only one of them. Further, the inner peripheral surface of the wall portion may be flat or curved.

In addition, at least one surface of each of the parts forming the first reservoir portion 6a, that is, the surface of the first wall portion 7a, the rear surface of the adjacent holding claw 3, and at least one surface of the connecting portion 5 is embossed or turned. It is preferable that eyes, grinding eyes, and electric discharge machining are formed. Thereby, the holding power of the grease can be increased. For example, turning, grinding, and electric discharge machining can be formed by providing turning, grinding, and electric discharge machining in advance in a mold for injection molding. It can also be obtained by subjecting the cage to turning or grinding. Further, it is also possible to form a textured surface by performing texture processing. Particularly, it is more preferable that turning, grinding, or electric discharge machining is formed on the surface of the reduced diameter portion of the wall portion. The same applies to the surface of each part constituting the second reservoir 6b.

FIG. 4 shows a radial cross-sectional view of the pocket portion of the cage. In the configuration of FIG. 4B, the pocket radius of the cage 1 is larger than the radius of the balls 14. That is, since the radius R of the pocket shape in the radial direction is larger than that of the held ball, the pocket surface contacts the ball 14. On the other hand, in the configuration of FIG. 4A, the pocket radius of the cage 1 is smaller than the radius of the balls 14. That is, since the radius R of the pocket shape in the radial direction is smaller than that of the held ball, the edge portion 4c of the pocket 4 contacts the ball 14. In addition, as shown in FIG. 4, the edge portion 4 c is an edge portion located on the inner and outer diameter surfaces of the cage 1. In the configuration of FIG. 4A, the grease attached to the surface of the ball is scraped off by the edge portion 4c, so that the grease shear resistance in the gap between the ball 14 and the pocket 4 can be reduced.

Since the cage of the present invention can obtain a very large low torque effect, it has both a grease scraping portion (edge portion 4c) as shown in FIG. 4(a) in addition to the above-mentioned reservoir portion. It is preferable. For example, in the configuration of FIG. 4B, although the grease agitation resistance can be reduced by the reservoir, the grease is always attached to the ball surface, and it is difficult to reduce the shear resistance between the pockets. On the other hand, with a cage that does not have a reservoir and has a grease scraping portion, the shear resistance between the pockets can be reduced, but the grease cannot be retained as a whole, so the stirring resistance cannot be reduced. Further, when the grease is agitated, it is difficult to eliminate the influence even though the grease shear can be reduced. The same applies when there is grease shearing, and it is difficult to eliminate the effects of grease agitation.

Therefore, in addition to the reservoir, the cage that has both the grease scraping section (edge section 4c) scrapes off the grease on the ball surface while catching the grease with the cage itself, which affects both grease shearing and grease agitation. Can be eliminated, which is even more effective in reducing the torque. With this configuration, an extremely low torque can be obtained from the initial operation of the bearing, and the low torque state can be maintained for a long time.

The cage of the present invention is made of a resin material. As the resin material, any material can be used as long as it can be injection-molded and has sufficient heat resistance and mechanical strength as a cage material. For example, a polyamide resin such as a polyether ether ketone (PEEK) resin, a polyphenylene sulfide (PPS) resin, a thermoplastic polyimide resin, a polyamideimide resin, a nylon 66 resin, a nylon 46 resin, a nylon 6T resin, or a nylon 9T resin is used as a resin base material. In addition, a resin composition containing reinforcing fibers such as carbon fibers and glass fibers and other additives can be used. By performing injection molding using a mold in which only the pocket is slightly changed in shape with respect to the standard cage, it can be manufactured at substantially the same cost as the standard cage.

An example of the rolling bearing of the present invention will be described based on FIG. FIG. 5 is a partial cross-sectional view of a deep groove ball bearing incorporating the crown cage of the present invention as the rolling bearing of the present invention. As shown in FIG. 5, in the rolling bearing 11, an inner ring 12 having a raceway surface 12a on the outer peripheral surface and an outer race 13 having a raceway surface 13a on the inner peripheral surface are concentrically arranged. A plurality of balls 14, which are rolling elements, are disposed between the inner raceway surface 12a and the outer raceway surface 13a. The plurality of balls 14 are held in the pockets of the cage 15 having a crown shape. The form of the cage 15 is as shown in FIGS. 1 and 2 (the cage 1). Further, the rolling bearing 11 is provided with an annular seal member 16 provided at both axial end openings of the inner and outer rings, and is formed in a bearing inner space formed by the inner ring 12, the outer ring 13, the cage 15 and the seal member 16. It is lubricated by the enclosed grease 17.

The rolling bearing of the present invention is lubricated with grease. The grease is sealed in the bearing internal space and is intervened on the raceway surface or the like for lubrication. As the base oil constituting the grease, mineral oil, synthetic oil or the like can be used without particular limitation as long as it is usually used for rolling bearings. Further, as the thickener constituting the grease, any thickener commonly used for rolling bearings such as metallic soap and urea compounds can be used without particular limitation.

The amount of grease enclosed is not particularly limited as long as the desired lubrication characteristics can be secured, but it is preferably about 50% to 100% (volume ratio) of the static space volume in the bearing internal space. As described above, the rolling bearing of the present invention can increase the amount of grease accumulated by providing the grease reservoirs (first reservoir and second reservoir), and is therefore suitable for conditions in which a large amount of grease is enclosed. Therefore, it is more preferable that the amount of grease enclosed is 65% to 100% of the volume of the stationary space. Here, the stationary space volume is the volume of the space in which the rolling elements and the cage do not pass during bearing rotation in the space volume of the inner ring, the outer ring and the seal member. Furthermore, by combining the configuration of FIG. 4, the grease on the ball surface is scraped off by the edge portion of the cage pocket, and the shearing resistance of the grease can be reduced. Therefore, the rotation torque can be reduced.

The rolling bearing of the present invention is not limited to the form of FIG. 1 (deep groove ball bearing) as long as it is a type of bearing that uses a crown type cage. Further, it is possible to apply these rolling bearings with or without a seal member.

As described above, in the cage of the present invention, the wall (first wall portion) is provided on the outer diameter side between the holding claws between the pockets adjacent to each other in the circumferential direction, and the recess (the first wall portion) is formed on the non-opening side of the cage. (2 reservoir) is provided, and the inner diameter of the outer diameter side wall between the holding claws or the surface of the non-opening side recess facing the center axis of the retainer decreases from the width center side of the bearing toward the side surface. Since the reduced diameter portion is provided, it is possible to prevent the grease from scattering from the grease storage portion due to centrifugal force when the bearing is rotated, and it is possible to suitably reduce the stirring resistance and shear resistance of the grease.

INDUSTRIAL APPLICABILITY The cage for rolling bearings of the present invention has a relatively simple structure and can reduce the rotational torque of rolling bearings without changing grease or seals. Widely used as a shape retainer. In particular, since it has excellent grease holding power and suitably reduces stirring resistance, it can be suitably used as a cage for rolling bearings having a large amount of grease filled therein.

1 Cage (roller bearing cage)
2 Cage main body 3 Holding claw 4 Pocket 4a Outer wall part 4b Thick part 5 Connection part 6a First reservoir part 6b Second reservoir part 7a First wall part 7b Second wall part 8a Reduced diameter part 8b Reduced diameter part 11 Rolling bearing 12 Inner ring 13 Outer ring 14 Balls (rolling elements)
15 Cage 16 Sealing member 17 Grease

Claims (6)

A cage for rolling bearings made of resin,
The cage is a crown-shaped cage that has a plurality of pockets opened on one side in the axial direction on an annular cage body, and retains balls rotatably in the pockets.
The cage has a first reservoir part and a second reservoir part for retaining grease between the pockets adjacent to each other in the circumferential direction on the pocket opening side and the pocket non-opening side, respectively.
The inner diameter side of the first reservoir is opened and the outer diameter side is closed by the first wall portion, and the second reservoir portion is opened on the inner diameter side and the outer diameter side is closed by the second wall portion,
At least one of the first wall portion and the second wall portion has a reduced diameter portion that reduces in diameter toward the outside in the axial direction of the retainer, the rolling bearing retainer. The cage for rolling bearing according to claim 1, wherein the reduced diameter portion is an inclined surface that is continuously inclined with respect to a surface orthogonal to the axial direction. The rolling bearing cage according to claim 1 or 2, wherein turning, grinding, or electric discharge machining is formed on the surface of the reduced diameter portion. The rolling bearing cage according to any one of claims 1 to 3, wherein a radius of the pocket is smaller than a radius of the ball. Between adjacent pockets, a connecting portion that connects the outer wall portions of the adjacent pockets is provided, and the connecting portion separates the first reservoir portion and the second reservoir portion,
5. The height of the first wall portion in the axial direction of the cage is smaller than the height of the second wall portion in the axial direction of the cage, any one of claims 1 to 4. The cage for rolling bearing according to item 1. A rolling bearing comprising an inner ring and an outer ring, balls which are a plurality of rolling elements interposed between the inner ring and the outer ring, a cage for holding the balls, and a grease filled in a bearing inner space. There
The cage is a cage for rolling bearings according to any one of claims 1 to 5,
The rolling bearing is characterized in that the amount of grease filled in the rolling bearing is 65% to 100% of the static space volume of the bearing inner space.

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