JP2005299757A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing capable of achieving high speed, long service life, and a maintenance-free condition using only grease sealed into the bearing. <P>SOLUTION: This rolling bearing having an inner ring 1, an outer ring 2, and a plurality of rolling bodies 3 provided between raceway surfaces 1a and 2a of these inner and outer rings 1, 2 is provided with a grease sump forming part 6 and a clearance forming piece 7. The grease sump forming part 6 forms a grease sump 8 inside it and is provided in contact with the outer ring 2. The clearance forming piece 7 is a member communicating from the grease sump 8 to the vicinity of the raceway surface 2a of the outer ring and forming a clearance 14 along an inside diameter face 2b of the outer ring. Gap amount of the clearance 14 is such size that supplies basic oil of grease in the grease sump 8 to the vicinity of the raceway surface 2a of the outer ring by capillary phenomenon of thickener. Projections whose tips come into contact with a peripheral face of the outer ring 2 opposing to the clearance forming piece 7 are provided in a plurality of sections in the circumferential direction of the clearance forming piece 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling bearing with a lubrication mechanism for grease lubrication of a machine tool main shaft or the like.

  As a lubrication method for machine tool spindle bearings, grease lubrication that can be used maintenance-free, air-oil lubrication in which lubricating oil is mixed with carrier air and oil is injected into the bearing from the nozzle, jet that injects lubricating oil directly into the bearing There are methods such as lubrication. In recent machine tools, in order to increase machining efficiency, there is a tendency for higher speed, and lubrication of main shaft bearings is also relatively inexpensive and air-oil lubrication that can be speeded up easily is often used. However, this air oil lubrication method has a problem from the viewpoint of cost, noise, energy saving, and resource saving because it requires an air oil supply device as ancillary equipment and requires a large amount of air. There is also a problem of deteriorating the environment due to the scattering of oil. In order to avoid these problems, recently, speeding up by grease lubrication has begun to attract attention, and requests have been increasing.

  Since grease lubrication is performed only with the grease enclosed at the time of bearing assembly, high-speed operation may lead to premature seizure due to deterioration of the grease due to bearing heat generation and oil film breakage on the raceway surface, especially the inner ring. . In particular, it is difficult to guarantee the grease life in a high-speed rotation region where the dn value exceeds 1 million (bearing inner diameter mm × rotational speed rpm).

New proposals have been introduced as a means of extending the life of grease. For example, there is a proposal (Patent Document 1) aiming at high speed and long life by providing a grease reservoir on the outer ring raceway surface. In addition, there is a proposal (Patent Document 2) in which a bearing is properly lubricated and lubricated by a grease reinforcing device provided outside the spindle.
Japanese Patent Laid-Open No. 11-108068 Japanese Unexamined Patent Publication No. 2000-113998

  However, the technologies of the above proposed examples are not satisfactory when considering the number of rotations used (> dn value 1.5 million) equivalent to air-oil lubrication and maintenance-free.

  In order to solve such a problem, the present applicant previously provided a grease pool forming component in contact with the fixed bearing ring of the bearing, and also provided a gap along the circumferential surface of the raceway surface forming portion of the fixed bearing ring. Has been proposed (see Japanese Patent Application No. 2003-424619). The gap communicates from the grease reservoir to the vicinity of the raceway surface of the fixed side raceway, and the base oil of the grease in the grease reservoir is brought to the vicinity of the raceway surface of the fixed side raceway ring by capillary action of the thickener in the gap. Supply.

By the way, in the case of grease lubrication according to the configuration of the above proposed example, the gap amount δ of the gap 54 formed between the fixed-side race ring (for example, the outer ring) 42 and the gap forming piece 47 is not appropriate as shown in FIG. In addition, the grease base oil cannot be smoothly supplied due to the capillary action described above. Therefore, it is necessary to process the outer diameter of the gap forming piece 54 with high accuracy so that the gap amount δ of the gap 54 with respect to the inner diameter of the fixed side raceway ring 42 is uniform.
However, when the gap forming piece 47 is machined, for example, because the thickness thereof is thin, there is a problem that the gap amount δ becomes non-uniform or deviates from a predetermined value due to deformation at the time of machining. is there. The gap forming piece 47 can be manufactured by pressing or resin injection molding in addition to the shaving process. However, since the gap forming piece 47 is thin, deformation due to the machining is also possible. There is a problem that it is difficult to ensure a predetermined dimensional accuracy due to (roundness defect etc.).

  The object of the present invention is to eliminate these problems, and it is possible to achieve high speed, long life and maintenance-free operation using only the grease sealed in the bearing, and for supplying grease base oil. The present invention provides a rolling bearing in which a gap can be stably obtained and cost can be reduced by facilitating manufacture.

  The rolling bearing according to the present invention is a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceways of the inner and outer rings, and is in contact with a non-rotating fixed-side bearing ring among the inner ring and outer ring that are the bearing rings. A grease reservoir forming component having a grease reservoir formed therein and a clearance that is provided in the fixed-side raceway and communicates from the grease reservoir to the vicinity of the raceway surface of the fixed-side raceway are formed on the raceway surface. And a gap forming piece formed along the peripheral surface. The gap has a slight gap amount so that the base oil of the grease in the grease reservoir can be supplied to the vicinity of the raceway surface of the stationary raceway by capillary action of the thickener, and the circumferential direction of the gap forming piece Protrusions whose tips are in contact with the circumferential surface of the race ring facing the gap forming piece are provided at a plurality of locations. The height of the protrusion is set to the same value as the gap amount of the gap. It is preferable that the tips of the gap forming pieces have an interval close enough that they do not contact the rolling elements. The gap forming piece is formed integrally with, for example, a grease reservoir forming part.

  The rolling bearing of this configuration is used by enclosing grease around the entire circumference of the gap formed between the grease reservoir and the gap forming piece and the peripheral surface on which the raceway surface of the fixed side raceway is formed. Grease is sealed inside the bearing as an initial lubricant. Accordingly, the grease reservoir and the rolling element contact portion on the raceway surface of the fixed side raceway are connected by the grease. When the grease is thus connected, the base oil permeates and moves due to the capillary action of the thickener in the grease. For this reason, the base oil consumed as lubricating oil in the rolling element contact portion is continuously supplied from the grease reservoir to the rolling element contact portion through the gap. As a result, the lubrication life of the bearing is determined by the amount of grease in the grease reservoir, and by designing the capacity of the grease reservoir as appropriate, only the grease enclosed in the bearing is used and maintenance-free high speed is achieved. Operation and longer life are achieved.

  The gap amount of the gap is uniformly stabilized over the entire circumference by the protrusions provided at a plurality of locations in the circumferential direction of the gap forming piece even if the machining accuracy of the surface of the gap forming piece facing the fixed-side raceway is somewhat poor. Therefore, the above-described base oil supply can be made more reliable. As described above, since the gap amount of the gap can be easily secured, the tolerance range at the time of producing the gap forming piece can be widened, so that the production is easy and the production cost can be reduced.

If the gap forming piece is provided facing the rotating raceway, the grease is excessively supplied due to the centrifugal force due to rotation, which may cause a temperature rise, but it faces the fixed raceway. When the gap forming piece is provided, the grease base oil is supplied by the capillary phenomenon as described above without being affected by the centrifugal force, and is lubricated with a slight amount of lubricating oil. Therefore, there is no stirring resistance and the temperature rise is stable.
The gap forming piece does not necessarily have to be provided on the entire circumference, but by providing it continuously on the entire circumference, the base oil can be replenished to the raceway surface of the fixed-side raceway from the entire circumference by the above-mentioned capillary phenomenon. It can be made excellent. If the grease reservoir is provided continuously over the entire circumference, the supply of base oil supply is excellent.

In the present invention, the fixed-side track ring may be an outer ring. In this case, the grease reservoir forming component is provided in contact with the outer ring, and the gap forming piece is also provided on the outer ring, and the grease reservoir communicates from the grease reservoir to the vicinity of the outer ring raceway surface between the gap forming piece and the inner diameter surface of the outer ring. A gap is formed.
When the gap forming piece is provided on the outer ring side in this way, when the bearing is rotated with grease sealed, the grease enclosed in the bearing is scattered toward the inner diameter of the outer ring by centrifugal force, and part of it Is deposited at the tip of the gap forming piece. This ensures the grease connection between the grease reservoir and the rolling element contact portion of the outer ring raceway surface. When the grease is thus connected, the base oil permeates and moves due to the capillary action of the thickener in the grease. For this reason, the base oil consumed as lubricating oil in the rolling element contact portion is continuously supplied from the grease reservoir to the rolling element contact portion through the gap. As a result, the lubrication life of the bearing is determined by the amount of grease in the grease reservoir, and by designing the capacity of the grease reservoir as appropriate, only the grease enclosed in the bearing is used and maintenance-free high speed is achieved. Longer operating life is achieved.

  In the present invention, at least three projections may be provided at substantially equal intervals. In this way, by providing the protrusions at equal intervals in three or more circumferential directions of the gap forming piece, the entire circumference of the gap forming piece can be evenly supported by the fixed-side raceway with the protrusion, and more reliably The gap amount of the gap can be kept uniform over the entire circumference.

  In the present invention, the gap forming piece may be made of metal, and the protrusion may be formed by press working. According to the press working, since the protrusion can be integrally processed with the gap forming piece, the manufacturing becomes easy and the manufacturing cost can be further reduced.

  In this invention, the gap forming piece may be made of resin, and the protrusion may be formed by injection molding of the gap forming piece. Also in the case of injection molding, since the protrusion can be integrally processed with the gap forming piece, the manufacturing becomes easy and the manufacturing cost can be further reduced.

  The rolling bearing according to the present invention includes a grease reservoir forming part that is provided in contact with the fixed-side raceway and forms a grease reservoir therein, and a raceway surface of the fixed-side raceway that is provided in the fixed-side raceway from the grease reservoir. A gap forming piece that forms a gap that communicates to the vicinity along the circumferential surface on which the raceway surface is formed, and the gap is formed by the base oil of the grease in the grease reservoir due to the capillary phenomenon of the thickener. Since the gap is small enough to be supplied to the vicinity of the surface, only the grease enclosed in the bearing can be used to achieve high speed, long life, and maintenance-free. In particular, since a plurality of protrusions whose tips are in contact with the circumferential surface of the bearing ring facing the gap forming piece are provided at a plurality of locations in the circumferential direction of the gap forming piece, the gap amount of the gap can be uniformly and stably distributed over the entire circumference. As a result, the base oil can be replenished more reliably. Therefore, the accuracy requirement of the gap forming piece is eased, the manufacture is easy, and the manufacturing cost can be reduced.

  A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, this rolling bearing has a plurality of rolling elements 3 interposed between raceways 1a and 2a of an inner ring 1, an outer ring 2, and inner and outer rings 1 and 2, and a grease pool forming component 6 and a gap forming piece. 7. The plurality of rolling elements 3 are held by a cage 4, and one end of the bearing space between the inner and outer rings 1 and 2 is sealed with a seal 5. This rolling bearing is an angular ball bearing, the seal 5 is provided at the end on the back side of the bearing, and the grease reservoir forming component 6 and the gap forming piece 7 are provided in the bearing on the front side of the bearing. On the front side of the bearing, the grease reservoir forming part 6 also serves as a seal, and grease leakage from the front side of the bearing is prevented. In the figure, the crossed hatched portions indicate portions filled with grease.

  The grease reservoir forming component 6 is a ring-shaped component having a grease reservoir 8 formed therein, and by disposing the grease reservoir forming component 6 on the inner diameter surface 2e of the outer ring 2, the bearing space between the inner and outer rings 1 and 2 is increased. A grease reservoir 8 is formed inside. The grease reservoir forming component 6 has an outward groove-shaped cross-sectional shape, and a gap forming piece 7 is integrally provided. In this embodiment, the length from the center of the raceway surface 2a of the outer ring 2 to the width surface on the bearing back side is made longer to the width surface on the bearing front side which is the arrangement side of the grease reservoir forming component 6, and this length is increased. The grease pool forming component 6 is fitted to the outer ring inner diameter surface 2e of the part. In this case, the inner and outer rings 1 and 2 have the same width dimension, the width dimension is larger than the standard dimension in one direction, and the inner diameter surface 2e of the portion where the width dimension of the outer ring 2 is increased is as described above. The grease reservoir forming component 6 is fitted.

  A portion of the inner diameter surface 2b (FIG. 2) following the raceway surface 2a of the outer ring 2 is a tapered surface in consideration of the incorporation property of the rolling element 3, and a cylindrical surface shape following the inner diameter surface 2b of the tapered surface is The grease reservoir forming component 6 is fitted to the inner diameter surface 2e. An internal space sandwiched between the inner diameter surface 2 e and the grease reservoir forming component 6 is a grease reservoir 8.

  The outer ring 2 has an engaging step 2f at the front end of the bearing on the inner diameter surface 2e for fitting the tip of the side wall 6a outside the bearing in the grease reservoir forming component 6. The grease reservoir forming component 6 engages the side wall portion 6a with an engaging step portion 2f formed on the inner diameter surface 2e of the outer ring after sealing the grease in the grease reservoir 8, and stops the inner diameter surface of the engaging step portion 2f. It is fixed in the axial direction by a retaining ring 15 that engages with the annular groove. A sealing component 12 such as an O-ring is provided between the outer diameter surface of the side wall portion 6a of the grease reservoir forming component 6 and the engaging stepped portion 2f of the outer ring inner diameter surface 2e to prevent grease leakage.

  The gap forming piece 7 has a ring shape that forms a gap 14 along the inner diameter surface 2 b of the outer ring 2. The gap forming piece 7 is formed integrally with the grease reservoir forming part 6. That is, it extends integrally from the outer diameter end of the side wall 6b on the rolling element 3 side of the grease reservoir forming component 6.

  As shown in an enlarged view in FIG. 2, in the angular ball bearing, the inner diameter surface 2 b of the outer ring counterbore portion on the front side is a tapered surface having a larger diameter on the width surface side from the ease of assembly of the rolling elements 3. The gap forming piece 7 extends to the vicinity of the outer ring raceway surface 2a so as to form a gap 14 having a predetermined gap amount δ along the tapered surface 2b. The gap 14 communicates with the grease reservoir 8. The gap amount δ of the gap 14 may be such that the gap 14 is held in a grease state when the gap 14 is filled with grease. The tip 7a of the gap forming piece 7 is brought close to the rolling element 3 so as not to contact the rolling element 3.

  As shown in the front view of FIG. 3, the outer peripheral surface of the tip 7a of the gap forming piece 7 has an inner peripheral surface of the outer ring 2 at a plurality of locations in the circumferential direction (here, four locations). Protrusions 16 whose tips contact each other are provided at equal intervals. By providing the plurality of protrusions 16 in this way, the gap amount δ of the gap 14 is kept uniform over the entire circumference. The number of the protrusions 16 is preferably at least 3 or more. When three or more protrusions 16 are provided at equal intervals, the entire circumference of the gap forming piece 7 can be evenly supported by the fixed side rail with the protrusions, and the gap amount of the gap can be more evenly distributed over the entire circumference. Can keep. The height of the protrusion 16 is set to the same value as the gap amount δ of the gap 14. When the gap forming piece 7 is made of metal, the protrusion 16 may be formed by pressing. In this case, since the protrusion 16 can be integrally processed with the gap forming piece 7, the manufacturing is facilitated and the manufacturing cost can be reduced. When the gap forming piece 7 is made of resin, the protrusion 16 may be formed by injection molding of the gap forming piece 7. Also in this case, since the protrusion 16 can be integrally processed with the gap forming piece 7, the manufacturing is facilitated and the manufacturing cost can be reduced.

  Further, the inner diameter surface of the distal end portion 7a of the gap forming piece 7 is an inclined surface 7aa that increases in diameter toward the rolling element 3 side. The inclined surface 7aa is configured such that when the grease enclosed in the bearing is scattered toward the inner diameter of the outer ring by centrifugal force during the operation of the bearing, the scattered grease is likely to accumulate at the tip 7a of the gap forming piece 7. It is a thing. In order to avoid interference with the cage 4, the inner diameter surface 7 b extending from the inclined surface 7 aa of the gap forming piece 7 to the outer diameter end portion of the side wall portion 6 b of the grease reservoir forming component 6 The diameter is larger than the cage guide surface 2d (FIG. 1) which is a surface.

  The operation of the above configuration will be described. When the bearing is assembled, the grease reservoir 8 and the gap 14 are filled with grease. In addition, grease for initial lubrication is sealed in the bearing. By operating the bearing, the grease sealed in the bearing is scattered by centrifugal force, and a part of the grease is deposited on the outer ring raceway surface 2a and the tip 7a of the gap forming piece 7. As grease accumulates here, the grease reservoir 8 communicates with the rolling element contact portion 2aa (FIG. 2) of the outer ring raceway surface 2a. That is, the grease reservoir 8 and the rolling element contact portion 2aa of the outer ring raceway surface 2a are connected by the grease. Therefore, the base oil in the grease permeates and moves due to the capillary action of the thickener, and the base oil consumed as lubricating oil in the rolling element contact portion 2aa passes through the gap 14 from the grease reservoir 8 to the rolling element contact portion. 2aa is replenished continuously. Therefore, the lubrication life of this bearing is determined by the grease consumption at the rolling element contact portion 2aa and the grease pool capacity at the grease reservoir 8.

  Since the outer diameter surface facing the outer ring 2 at the distal end portion 7a of the gap forming piece 7 is provided with projections 16 whose tips are in contact with the inner circumferential surface of the outer ring 2 at a plurality of positions in the circumferential direction at equal intervals. Even if the outer diameter of the tip 7a of the gap forming piece 7 is somewhat increased due to processing accuracy, the gap amount δ of the gap 14 is kept uniform over the entire circumference due to the effect of the protrusion 16 as a spacer. Thus, the above-described replenishment of the grease base oil can be made more reliable.

In this way, the grease base oil that is consumed as the lubricating oil in the rolling element contact portion 2aa of the outer ring raceway surface 2a is continuously supplied from the entire circumference of the bearing. In addition, since the lubrication life of the bearing is determined by the amount of grease in the grease reservoir 8, designing a grease reservoir capacity corresponding to the required life makes it possible to extend the service life of maintenance-free high-speed operation.
Further, in this embodiment, since the grease reservoir forming component 6 is disposed on the inner diameter surface 2e of the outer ring 2, the rolling bearing can be incorporated into the spindle device or the like after the grease reservoir 8 has been filled with grease. it can. Therefore, the workability of the bearing assembly is improved.

The features of the rolling bearing of this embodiment are summarized as follows.
1) Can be used without maintenance.
2) Since the lubricant is supplied using capillary action, the consumed amount is continuously replenished, and the speed can be increased.
3) The grease reservoir 8 can be designed according to the required life.
4) Grease lubrication can increase the speed of air-oil lubrication, and replacing air-oil lubrication with this lubrication method can reduce costs, reduce noise, and save energy.
5) Since the protrusions 16 are provided at a plurality of locations in the circumferential direction of the gap forming piece 7, the gap amount of the gap can be ensured uniformly over the entire circumference, the base oil replenishment is more stable, and the gap management is easy to manufacture. Manufacturing cost can be reduced.

  FIG. 4 shows an example of a spindle device for machine tools using the rolling bearing of the above embodiment. In the spindle device for machine tools, two of the rolling bearings are used as a back surface combination. The two rolling bearings 23 and 24 rotatably support both ends of the main shaft 21 within the housing 22. The inner ring 1 of each rolling bearing 23, 24 is positioned by an inner ring positioning spacer 26 and an inner ring spacer 27, and is fastened and fixed to the main shaft 21 by an inner ring fixing nut 29. The outer ring 2 is positioned and fixed in the housing 22 by an outer ring spacer 30 and outer ring pressing lids 31 and 32. The housing 22 has a housing inner cylinder 22A and a housing outer cylinder 22B fitted together, and a cooling oil passage groove 33 is provided in the fitting portion.

  The spindle 21 is provided with a chuck (not shown) for detachably attaching a tool or a work (not shown) to the front end 21a, and a drive source such as a motor transmits rotation to the rear end 21b. They are connected via a mechanism (not shown). The motor may be built in the housing 22. The spindle device can be applied to various machine tools such as a machining center, a lathe, a milling machine, and a grinding machine.

  According to the spindle device having this configuration, the rolling bearings 23 and 24 of this embodiment can effectively exhibit the effects of speeding up, extending the service life, and making maintenance free.

  FIG. 5 shows another embodiment of the present invention. In the rolling bearing of this embodiment, the grease reservoir forming component 6A is provided in contact with the front width surface of the outer ring 2. In this example, the grease reservoir forming component 6A includes an outer ring positioning spacer 9 provided in contact with the front width surface of the outer ring 2 and an outward groove-type grease fitted to the inner diameter surface of the outer ring positioning spacer 9. It consists of a pool forming component main body 10. An internal space sandwiched between the outer ring positioning spacer 9 and the grease reservoir forming component main body 10 is a grease reservoir 8. The outer ring positioning spacer 9 has an engaging step portion 9a for fitting the tip of the side wall portion 10a of the grease reservoir forming component main body 10 at the end opposite to the outer ring 2 on the inner diameter surface. The grease reservoir forming component main body 10 is configured to engage the above-mentioned side wall portion 10a with the engaging step portion 9a of the outer ring positioning spacer 9 after sealing the grease in the grease reservoir 8, and to stop the inner diameter surface of the engaging step portion 9a. The outer ring positioning spacer 9 is fixed in the axial direction by a retaining ring 11 that engages with the groove. The inner diameter of the grease pool forming component body 10 between the outer diameter surface of the side wall portion 10a and the engaging step 9a of the outer ring positioning spacer 9 and the adjacent portion of the outer ring positioning spacer 9 and the outer ring 2 in contact with the outer ring positioning spacer 9 Sealing parts 12 and 13 such as O-rings are provided on the surface to prevent grease leakage.

  The portion of the inner diameter surface 2b following the raceway surface 2a of the outer ring 2 is a tapered surface in consideration of the built-in property of the rolling element 3 as in the angular ball bearing shown in FIG. A gap forming piece 7 is integrally formed at the outer diameter end of the side wall 10b adjacent to the bearing of the grease reservoir forming component body 10, and the gap forming piece 7 is close to the raceway surface 2a along the inner diameter surface 2b of the outer ring 2. The gap 14 is formed by being extended to a distance, the protrusions are provided at a plurality of locations in the circumferential direction of the outer diameter surface of the tip 7a of the gap forming piece 7, and the gap amount of the gap 14 is shown in FIG. This is the same as the first embodiment.

  FIG. 6 shows still another embodiment of the present invention. In this embodiment, the configuration of the grease reservoir forming component 6A in the embodiment shown in FIG. 5 is applied to a cylindrical roller bearing. The grease reservoir forming component 6A is provided adjacent to both sides of the outer ring 2 in the axial direction. Other configurations are the same as those of the embodiment of FIG.

  In this embodiment, grease base oil can be continuously supplied from the grease reservoirs 8 on both sides to the outer ring raceway surface 2a. In the case of a cylindrical roller bearing, the roller serving as the rolling element 3 has a certain length. Therefore, it is preferable to supply the base oil of grease from both sides in terms of improving lubricity because it can be supplied in the axial direction without deviation. Thereby, speed-up, long life, and maintenance-free can be further improved.

  In each of the above embodiments, the case where the grease pool forming parts 6 and 6A and the gap forming piece 7 are provided on the outer ring 2 side has been described. However, when the inner ring 1 is a fixed side ring, the grease pool is formed on the inner ring 1. The parts 6 and 6A and the gap forming piece 7 are provided.

It is a fragmentary sectional view of the rolling bearing concerning a 1st embodiment of this invention. It is a partial expanded sectional view of the rolling bearing. It is a front view of the clearance gap formation piece in the rolling bearing. It is sectional drawing of the spindle apparatus for machine tools using the rolling bearing. It is a fragmentary sectional view of the rolling bearing concerning other embodiments of this invention. It is a fragmentary sectional view of the rolling bearing concerning other embodiment of this invention. It is a partial expanded sectional view of a prior proposal example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inner ring 2 ... Outer ring 1a, 2a ... Raceway surface 3 ... Rolling elements 6, 6A ... Grease accumulation part 7 ... Gap formation piece 8 ... Grease accumulation 14 ... Gap 16 ... Protrusion

Claims (5)

  In a rolling bearing having an inner ring, an outer ring, and a plurality of rolling elements interposed between the raceway surfaces of the inner and outer rings, the inner ring and outer ring that are the race rings are provided in contact with the non-rotating fixed side race ring and are internally greased. A grease reservoir forming component that forms a reservoir and a gap that is provided in the stationary side raceway and communicates from the grease reservoir to the vicinity of the raceway surface of the stationary side raceway is formed along the circumferential surface on which the raceway surface is formed. The gap has a slight gap amount that allows the base oil of the grease in the grease reservoir to be supplied to the vicinity of the raceway surface of the fixed-side raceway due to the capillary action of the thickener. A rolling bearing characterized in that a plurality of protrusions whose tips are in contact with the circumferential surface of the bearing ring facing the gap forming piece are provided at a plurality of locations in the circumferential direction of the gap forming piece.   The rolling bearing according to claim 1, wherein the stationary race is an outer ring.   The rolling bearing according to claim 1 or 2, wherein at least three or more protrusions are provided at substantially equal intervals.   The rolling bearing according to any one of claims 1 to 3, wherein the gap forming piece is made of metal and the protrusion is formed by pressing. The rolling bearing according to any one of claims 1 to 3, wherein the gap forming piece is made of a resin, and the protrusion is formed by injection molding of the gap forming piece.

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