JP2013087894A - Method of manufacturing rolling bearing, and the rolling bearing - Google Patents

Abstract

An object of the present invention is to provide a method of manufacturing a rolling bearing and a rolling bearing that are unlikely to increase in rotational torque and that have excellent acoustic characteristics, sealing performance, and bearing life.
A rolling bearing according to the present invention performs a shot peening process on a sliding contact portion of the inner ring 1 after heat treatment with the sealing device 5 and then performs a low friction process for reducing a friction coefficient. Thereafter, the raceway surface 1a of the inner ring 1 is ground. For this reason, the rolling bearing of the present invention is less likely to increase the rotational torque of the rolling bearing by the sealing device 5, and is excellent in acoustic characteristics, sealing performance, and bearing life.
[Selection] Figure 1

Description

  The present invention relates to a method for manufacturing a rolling bearing including a sealing device that seals an opening of a gap formed between an inner ring and an outer ring, and a rolling bearing.

Conventionally, for example, a rolling bearing has been provided with a sealing device in order to prevent water, water vapor, foreign matter and the like from entering the raceway surface from the outside of the bearing, and to prevent leakage of the lubricant sealed inside the bearing. Yes. The sealing device is disposed on one of the outer ring and the inner ring and slidably contacts the other, and is formed so as to close a gap formed between the inner ring and the outer ring. Generally, a sliding contact portion with which an outer ring or inner ring sealing device is in sliding contact is not subjected to turning after heat treatment, and an oxide layer (hereinafter referred to as “scale”) is attached, resulting in a rough surface. Yes. Therefore, the frictional resistance is large in contact with the sealing device, and the durability of the sealing device against friction caused by sliding is poor. The magnitude of the frictional resistance causes an increase in the rotational torque of the rolling bearing, and when the sealing device is deteriorated due to wear, the sealing performance of the lubricant is lowered.
Therefore, a technique is known that reduces the frictional resistance with the sealing device by performing shot peening on the sliding contact portion and removing the scale (Patent Document 1).

JP 2006-266696 A

However, since the rolling bearing as described above performs the shot peening process after grinding the raceway surfaces of the inner ring and the outer ring, the impact of the shot peening process may be exerted not only on the sliding contact portion but also on the raceway surface. If the raceway surface is affected by the shot peening treatment, the surface roughness may deteriorate, resulting in an increase in rotational torque of the rolling bearing, deterioration in acoustic characteristics, and a decrease in bearing life. In addition, when a low friction treatment that reduces the coefficient of friction is performed on the seal surface, the influence of the low friction treatment may also affect the raceway surface, and the coating of the low friction treatment is due to the fatigue of the raceway surface when using a rolling bearing. There is a risk of peeling off and falling off and sticking into the track surface. This may cause an increase in rotational torque of the rolling bearing, deterioration of acoustic characteristics, and a decrease in bearing life.
Accordingly, the present invention solves the above-described problems of the prior art, is less likely to increase the rotational torque of the rolling bearing, and has a superior acoustic characteristic, sealing property and bearing life, and a rolling bearing manufacturing method and a rolling bearing. It is an issue to provide.

  In order to solve the above problems, a rolling bearing manufacturing method according to an aspect of the present invention includes an inner ring having a raceway surface on an outer peripheral surface and a raceway surface facing the raceway surface of the inner ring on the inner peripheral surface. An outer ring disposed on the outer side of the inner ring, a plurality of rolling elements disposed between the two raceways so as to be freely rollable, and the other of the inner ring and the outer ring disposed on one of the inner ring and the outer ring. And a sealing device that seals an opening of a gap formed between the inner ring and the outer ring, wherein the inner ring and the outer ring are in sliding contact with the sealing device. A shot peening process for removing a scale generated by the heat treatment, and a sealing peening process after the shot peening process, and performing a shot peening process on a sliding contact portion with the sealing apparatus after the heat treatment on the raceway A low friction treatment step for performing a low friction treatment for reducing a friction coefficient at a sliding contact portion of the contact ring with the sealing device, and a raceway of the race ring that is in sliding contact with the sealing device after the low friction treatment step. And a grinding process for grinding the surface.

In the method of manufacturing the rolling bearing, the center line average roughness of the raceway surface of the raceway in sliding contact with the sealing device after the grinding step is set to 0.1 μm or less, and the one in sliding contact with the sealing device. It is preferable that the center line average roughness of the sliding contact portion of the bearing ring with the sealing device is 0.3 μm or less.
In the rolling bearing manufacturing method, after the shot peening treatment step, the carbon concentration in a portion from the surface of the sliding contact portion of the raceway in sliding contact with the sealing device to the sealing device to a depth of 1 μm And the oxygen concentration is preferably 10% by mass or less.
Furthermore, in the method of manufacturing a rolling bearing, the low friction treatment is preferably a coating of the solid lubricant by a shot peening treatment using a solid lubricant.

  The rolling bearing according to an aspect of the present invention includes an inner ring having a raceway surface on an outer peripheral surface and an outer ring disposed on the outer side of the inner ring having a raceway surface facing the raceway surface of the inner ring on the inner peripheral surface. A plurality of rolling elements arranged to be freely rollable between the both raceway surfaces, and disposed in one of the inner ring and the outer ring and in sliding contact with the other of the inner ring and the outer ring, the inner ring and the outer ring A rolling bearing provided with a sealing device for sealing an opening of a gap formed between the inner ring and the outer ring, the race that is in sliding contact with the sealing device is heat-treated, and the race of the race The sliding contact portion with the sealing device is subjected to shot peening treatment and low friction treatment, and then the raceway surface of the raceway is ground.

  The rolling bearing according to the present invention performs shot peening on the slidable contact portion with the sealing device for the inner ring or outer ring after the heat treatment, and then performs a low friction process for reducing the friction coefficient. Thereafter, grinding is performed on the raceway surface of the raceway which is in sliding contact with the sealing device of the inner ring or the outer ring. For this reason, the rolling bearing of the present invention hardly increases the rotational torque of the rolling bearing by the sealing device, and is excellent in acoustic characteristics, sealing performance, and bearing life.

It is an axial sectional view showing the structure of a rolling bearing according to an embodiment of the present invention.

A rolling bearing manufacturing method and a rolling bearing according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an axial sectional view showing the structure of a deep groove ball bearing according to an embodiment of the present invention.
The deep groove ball bearing of FIG. 1 includes an inner ring 1 having a raceway surface 1a on an outer peripheral surface, an outer ring 2 having a raceway surface 2a facing the raceway surface 1a of the inner ring 1 on an inner peripheral surface, and both raceway surfaces 1a and 2a. A plurality of rolling elements (balls) 3 arranged so as to roll freely, a cage 4 that holds the rolling elements 3 between the inner ring 1 and the outer ring 2, and a gap formed between the inner ring 1 and the outer ring 2. Sealing devices 5 and 5 for closing the opening and sealing the inside. Then, in a gap (bearing internal space) surrounded by the inner ring 1, the outer ring 2, and the sealing devices 5 and 5, a lubricant G (which lubricates the raceway surfaces 1a and 2a and the rolling surfaces of the rolling elements 3). For example, lubricating oil and grease) are arranged. In the deep groove ball bearing of the present embodiment, the inner ring 1 and the outer ring 2 are relatively rotatable through the rolling of the rolling elements 3.

  The sealing devices 5 and 5 are formed of an integrally formed product of a seal member 5a disposed on one of the inner ring 1 and the outer ring 2 and in sliding contact with the other, and a reinforcing member 5b that reinforces the seal member 5a. . In the present embodiment, the seal member 5 a is fixed to the outer ring 2 at the base end portion, and the lip portions 5 c and 5 c that are the front end portions are in sliding contact with the inner ring 1. The seal member 5a is made of, for example, a rubber composition, and the reinforcing member 5b is made of metal or plastic. In addition, the sealing devices 5 and 5 do not need to be constituted by an integrally molded product of the seal member 5a and the reinforcing member 5b, and may be constituted only by the seal member 5a.

  The inner ring 1 is formed with annular grooves extending in the circumferential direction in the vicinity of both axial ends of the outer peripheral surface, and the lip portions 5c and 5c of the sealing devices 5 and 5 are in sliding contact with the inner surfaces of the grooves. That is, the inner surface of the groove forms the sealing surfaces 1b and 1b. Further, the seal surfaces 1b and 1b may not be the inner surface of the groove. The groove is not provided on the outer peripheral surface of the inner ring 1, and the lip portions 5c and 5c are slidably contacted with the outer peripheral surface of the inner ring 1, and this is used as the seal surface 1b. , 1b.

In FIG. 1, the sealing devices 5 and 5 are attached to the inner peripheral surface of the outer ring 2 and are in sliding contact with the outer peripheral surface of the inner ring 1. It may be in sliding contact with the inner peripheral surface. Further, the cage 4 may not be provided.
Further, examples of the material of the inner ring 1, the outer ring 2, and the rolling element 3 of the deep groove ball bearing of the present embodiment include bearing steel and stainless steel. Further, examples of the bearing steel include high carbon chromium bearing steel, and examples of the high carbon chromium bearing steel include SUJ2, SUJ3, SUJ1, SUJ4, SUJ5 and the like.

The deep groove ball bearing of this embodiment is manufactured as follows.
First, shot peening is performed on the seal surfaces 1b and 1b formed on the inner ring 1 after the heat treatment. The scale is adhered to the surface of the inner ring 1 after the heat treatment, whereby the surface roughness of the inner ring 1 becomes rough, and the frictional resistance increases in the contact between the seal surfaces 1b, 1b and the sealing devices 5, 5. Therefore, the sealing device 5 is obtained by removing the scales and welds of the seal surfaces 1b and 1b of the inner ring 1 after the heat treatment by shot peening, and forming the surface of the seal surfaces 1b and 1b with unevenness uniformly distributed. , 5 and the sealing surfaces 1b and 1b can be made in good contact. Thereby, the deep groove ball bearing of this embodiment is excellent in bearing life because it is difficult to increase the rotational torque and the sealability of the lubricant due to the deterioration of the sealing devices 5 and 5 is not easily reduced.
In addition, the shot peening process should just be given to the surface which the sealing apparatuses 5 and 5 slide at least, and may be given only to the sealing surfaces 1b and 1b like this embodiment, or each track surface 1a. , 2a may be applied to the entire surface.

The center line average roughness Ra of the seal surfaces 1b and 1b is preferably 0.3 μm or less. This is because if it exceeds 0.3 μm, the rotational torque of the rolling bearing may increase, and the sealing performance of the lubricant may deteriorate due to deterioration of the sealing devices 5 and 5. Further, the projection material used for the shot peening treatment is not particularly limited, but in addition to steel balls having an average particle diameter of 45 μm defined in Japanese Industrial Standard JIS R6001, SiC, SiO ₂ , Al ₂ O ₃ , glass A material harder than the surface to be treated, such as beads, is preferable.

  Furthermore, since the scale contains carbon and oxygen, when the scale adheres to the surfaces of the seal surfaces 1b and 1b, the carbon concentration in the portion from the surface of the seal surfaces 1b and 1b to a depth of 1 μm and Increases oxygen concentration. That is, when the scales on the surfaces of the seal surfaces 1b and 1b are removed, the carbon concentration and the oxygen concentration are low. Therefore, it is preferable that the carbon concentration and the oxygen concentration in the portion from the surface of the seal surfaces 1b and 1b after the shot peening treatment to the depth of 1 μm are 10% by mass or less, respectively. Since the scale may not be sufficiently removed if the carbon concentration and oxygen concentration in the portions from the surface of the seal surfaces 1b, 1b after the shot peening treatment to the depth of 1 μm exceed 10 mass%, the rolling bearing This is because there is a possibility that the sealing performance of the lubricant may be reduced due to an increase in rotational torque and deterioration of the sealing devices 5 and 5.

  Next, the low friction process which reduces a friction coefficient is given to the seal surfaces 1b and 1b of the inner ring 1 after the shot peening process. The low friction treatment is not particularly limited as long as it is a treatment that reduces the friction coefficient. For example, formation of a hard film by shot peening treatment or plating treatment on the seal surfaces 1b and 1b, seal surface 1b, Formation of a diamond-like carbon film by the plasma CVD method to 1b can be mentioned.

As a low friction treatment by shot peening treatment, a method of forming a hard film on the surfaces of the seal surfaces 1b and 1b by spraying solid lubricant powder to impart lubricity, a metal-based or ceramic-based projection material, etc. A method of making the surface uniform by spraying and reducing the contact area by forming a large number of minute recesses on the surface can be mentioned. However, it is preferable to use a solid lubricant because it can stably provide lubricity even under conditions where the oil film easily breaks, such as deterioration of the surface roughness of the material to be subjected to low friction treatment, contamination with foreign matter, and temperature rise. . The solid lubricant is not particularly limited as long as it can impart lubricity, and examples thereof include molybdenum disulfide (MoS ₂ ), graphite (graphite), and a fluororesin.

  Thereby, the surface roughness of the sealing surfaces 1b and 1b of the inner ring 1 is improved, the friction coefficient due to the sliding contact between the sealing surfaces 1b and 1b and the sealing devices 5 and 5 is reduced, and the wear of the sealing devices 5 and 5 is reduced. Is less likely to occur. Therefore, the deep groove ball bearing of this embodiment is excellent in hermeticity and hardly increases in rotational torque. Note that the surface to which the low-friction treatment is applied only needs to be applied to at least the surface with which the sealing devices 5 and 5 are in sliding contact, and may be provided only on the sealing surfaces 1b and 1b as in the present embodiment. The entire surface including the raceway surfaces 1a and 2a may be provided.

Next, the raceway surface 1a of the inner ring 1 after the low friction treatment is subjected to grinding. Grinding may be performed by grinding using a grindstone with small abrasive grains immediately after turning (finish grinding by superfinishing) or after grinding with a grindstone with large abrasive grains (rough grinding) after turning. A mode in which grinding using a small grindstone (finish grinding by superfinishing) may be performed.
Thus, the raceway surface 1a of the inner ring 1 of the deep groove ball bearing of the present embodiment is ground after the shot peening process. For this reason, even if the influence of the shot peening process on the raceway surface 1a and the surface roughness deteriorate, since the grinding process is performed later, the influence of the shot peening process does not occur. Therefore, the deep groove ball bearing of the present invention is excellent in bearing life because the increase in rotational torque and the deterioration of acoustic characteristics due to the surface roughness of the raceway surface 1a are unlikely to occur.

The center line average roughness Ra of the raceway surface 1a after grinding is preferably 0.1 μm or less. If it exceeds 0.1 μm, the rotational torque of the rolling bearing may increase, the acoustic characteristics may deteriorate, and the bearing life may decrease.
In addition, the surface to which grinding is performed should just be applied to at least the raceway surface 1a of the inner ring 1. In addition, the inner circumferential surface of the inner ring 1 and the end surfaces of the inner ring 1 and the outer ring 2 are subjected to grinding. May be.

The deep groove ball bearing of this embodiment was manufactured by assembling the inner ring 1 produced in this way, the outer ring 2, the rolling element 3, the cage 4 and the sealing devices 5 and 5 produced by a conventional method. Therefore, the deep groove ball bearing of this embodiment is less likely to increase the rotational torque of the deep groove ball bearing due to the sealing device, and is excellent in acoustic characteristics, sealing performance, and bearing life.
In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. For example, in the present embodiment, a deep groove ball bearing has been described as an example of the rolling bearing, but the present invention can be applied to various types of rolling bearings. For example, radial rolling bearings such as angular contact ball bearings, self-aligning ball bearings, cylindrical roller bearings, tapered roller bearings, needle roller bearings, and self-aligning roller bearings, and thrust types such as thrust ball bearings and thrust roller bearings This is a rolling bearing.

Hereinafter, the present invention will be described more specifically with reference to examples.
[About the centerline average roughness Ra of the raceway surface]
About the raceway surface of the inner ring | wheel of the deep groove ball bearing of the identification number 6305, the centerline surface roughness after each process was evaluated. The evaluation was performed by comparing the center line average roughness Ra after the heat treatment, after the shot peening treatment after the heat treatment, after the shot peening treatment after the heat treatment, and after grinding. In addition, silicon carbide (SiC) was used for the projection material used for the shot peening treatment, the injection pressure was 0.2 MPa or 0.5 MPa, and the injection time was shot peening treatment on the raceway surface of the inner ring under the condition of 10 minutes. . The results are shown in Table 1. In Table 1, (0.2 MPa) indicates an injection pressure of 0.2 MPa, and (0.5 MPa) indicates an injection pressure of 0.5 MPa.

  As can be seen from Table 1, the center line average roughness Ra of the raceway surface after the shot peening treatment after the heat treatment is 0.2 μm when the spray pressure of the projection material is 0.2 MPa. Then, by grinding, the thickness is 0.1 μm. Further, the center line average roughness Ra of the raceway surface after the shot peening treatment after the heat treatment is 0.3 μm when the spray pressure of the projection material is 0.5 MPa, but after that, the grinding process is performed. By performing, it becomes 0.1 μm.

  As a result, the inner ring of the rolling bearing according to the present invention is subjected to shot peening after heat treatment and then subjected to grinding, so even if it is affected by shot peening, subsequent grinding Thus, the center line surface roughness Ra can be reduced. Therefore, the rolling bearing according to the present invention is superior in bearing life to the conventional rolling bearing because it is less likely to cause an increase in rotational torque and deterioration in acoustic characteristics due to the centerline surface roughness Ra of the raceway surface. .

[2. Elemental analysis of seal surface after shot peening]
In order to confirm whether the scale was removed by the shot peening treatment, elemental analysis after each treatment was performed on the portion from the surface of the seal surface of the inner ring of the deep groove ball bearing having a nominal number 6305 to a depth of 1 μm. The elemental analysis was performed on the part from the surface of the seal surface to a depth of 1 μm after the heat treatment, after the shot peening treatment after the heat treatment, after the shot peening treatment after the heat treatment, and then sprayed with the solid lubricant powder. . The analysis was performed on iron (Fe), oxygen (O), carbon (C), molybdenum (Mo), and sulfur (S). The conditions for the shot peening process are the same as those described in [1. About the center line average roughness Ra of the raceway surface]. Further, molybdenum disulfide (MoS ₂ ) was used as the solid lubricant, and this was sprayed onto the seal surface by shot peening. The results are shown in Table 2.

  As can be seen from Table 2, the carbon concentration and the oxygen concentration are lower after the heat peening treatment after the heat treatment than after the heat treatment. Also, the carbon concentration and oxygen concentration after the shot peening treatment after the heat treatment and then the spraying of the solid lubricant powder are similarly lowered. Thereby, it can be seen that the scale is removed by the shot peening process. Therefore, the rolling bearing of the present invention has a longer bearing life than the conventional rolling bearing because the rotational torque of the rolling bearing is less likely to increase and the sealing performance of the lubricant is less likely to deteriorate due to deterioration of the sealing device.

[3. Effect on rotational torque using deep groove ball bearing with nominal number 6305]
The influence on the rotational torque of the rolling bearing of the present invention was examined. The rolling bearing according to the example is a deep groove ball bearing having a nominal number 6305 manufactured based on the manufacturing method of the rolling bearing of the present invention. In addition, Example 1 processed using silicon carbide (SiC) as a projection material by the injection pressure 0.2MPa, and Example 2 uses silicon carbide (SiC) as a projection material, and injection pressure. It is processed at 0.5 MPa. Other conditions for the shot peening process are the same as those described in [1. About the center line average roughness Ra of the raceway surface]. Further, a deep groove ball bearing according to Examples 1 and 2, after the shot peening treatment, was sprayed by shot peening the molybdenum disulfide (MoS ₂₎ as a solid lubricant.

  On the other hand, the rolling bearing according to the comparative example is a deep groove ball bearing having a nominal number 6305 manufactured based on a general manufacturing method. In Comparative Example 1, no heat treatment is performed after heat treatment. In Comparative Example 2, silicon carbide (SiC) was used as the projection material and treated at an injection pressure of 0.2 MPa, and in Comparative Example 3, silicon carbide (SiC) was used as the projection material and the injection pressure was set to 0. Processed at 5 MPa. Other shot peening process conditions are as described above.

Same as [1. About centerline average roughness Ra of raceway surface].
The sealing device was disposed on the outer ring so that the sealing device was in sliding contact with the sealing surface of the inner ring of these deep groove ball bearings. The deep groove ball bearings of the examples and comparative examples were filled with 3.4 g of grease, and were rotated under the conditions of room temperature (25 ° C.), radial load 39.2 N, axial load 98.0 N, and rotational speed 3000 min ⁻¹ . . And the deep groove ball bearing was rotated for 20 minutes, and the average value of the rotational torque of each bearing for stable 300 seconds just before the end of rotation was obtained. Table 3 shows the measurement results of the rotational torque of each bearing. The rotational torque was determined by subtracting the rotational torque with the sealing device removed from the rotational torque with the sealing device attached. In addition, the numerical values of the rotational torque of each bearing shown in Table 3 are relative values when the rotational torque of Comparative Example 1 is 1.

As can be seen from Table 3, the rotational torques of Examples 1 and 2 were lower than those of Comparative Example 1 in which no treatment was performed after heat treatment and Comparative Examples 2 and 3 in which only shot peening treatment was performed. It was. It can also be seen that the rotational torque of the deep groove ball bearing is reduced by about 35% as compared with Comparative Example 1 by performing the low friction process after removing the scale by the shot peening process.
Therefore, the rolling bearing of the present invention has a longer bearing life than the conventional rolling bearing, because it is difficult for the rotational torque to increase and the sealing performance of the lubricant due to deterioration of the sealing device does not easily decrease.

[4. Effect of grinding process on seal surface]
In the grinding process, the grinding oil is applied to the seal surface that has been subjected to the low-friction treatment, which may cause alteration or the like on the surface that has undergone the low-friction treatment. Therefore, elemental analysis of the seal surface after grinding was performed. A raceway surface, an inner diameter surface and an end surface of a deep groove ball bearing having a reference number 6305 manufactured based on the rolling bearing manufacturing method of the present invention were ground, and elemental analysis of the seal surface before and after the grinding processing was performed. The analysis was performed on iron (Fe), oxygen (O), molybdenum (Mo), and sulfur (S). The results are shown in Table 4.

  As can be seen from Table 4, the ratio of iron (Fe), oxygen (O), molybdenum (Mo), and sulfur (S) was not significantly changed before and after grinding, and it was found that no alteration occurred.

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Raceway surface 1b Seal surface 2 Outer ring 2a Raceway surface 3 Rolling element 4 Cage 5 Sealing device 5a Seal member 5b Reinforcement member 5c Lip part G Grease

Claims (5)

An inner ring having a raceway surface on the outer peripheral surface, an outer ring having a raceway surface facing the raceway surface of the inner ring on the inner peripheral surface, and an outer ring arranged on the outer side of the inner ring, and a free-rolling arrangement between the both raceway surfaces. A plurality of rolling elements, and a seal disposed on one of the inner ring and the outer ring and in sliding contact with the other of the inner ring and the outer ring to seal an opening of a gap formed between the inner ring and the outer ring A rolling bearing comprising a device, comprising:
Of the inner ring and the outer ring, the ring that is in sliding contact with the sealing device is subjected to a shot peening treatment on the sliding contact portion with the sealing device after heat treatment, and the scale generated by the heat treatment is removed. Process,
After the shot peening treatment step, a low friction treatment step for performing a low friction treatment for reducing a friction coefficient in a sliding contact portion with the sealing device of the raceway in sliding contact with the sealing device;
A rolling bearing manufacturing method comprising: a grinding process for grinding a raceway surface of a raceway in sliding contact with the sealing device after the low friction treatment process.   The center line average roughness of the raceway surface of the raceway in sliding contact with the sealing device after the grinding process is 0.1 μm or less, and the raceway of the raceway in sliding contact with the sealing device is slid with the sealing device. The method of manufacturing a rolling bearing according to claim 1, wherein the center line average roughness of the contact portion is set to 0.3 μm or less.   After the shot peening treatment step, the carbon concentration and oxygen concentration of the portion from the surface of the sliding contact portion of the raceway in contact with the sealing device to the sealing device to a depth of 1 μm are set to 10% by mass or less, respectively. The method for manufacturing a rolling bearing according to claim 1 or 2, wherein:   The method of manufacturing a rolling bearing according to claim 1, wherein the low friction treatment is a coating of the solid lubricant by a shot peening treatment using a solid lubricant. An inner ring having a raceway surface on the outer peripheral surface, an outer ring having a raceway surface facing the raceway surface of the inner ring on the inner peripheral surface, and an outer ring arranged on the outer side of the inner ring, and a free-rolling arrangement between the both raceway surfaces. A plurality of rolling elements, and a seal disposed on one of the inner ring and the outer ring and in sliding contact with the other of the inner ring and the outer ring to seal an opening of a gap formed between the inner ring and the outer ring A rolling bearing comprising a device,
Of the inner ring and the outer ring, the bearing ring that is in sliding contact with the sealing device is heat-treated, and the sliding contact portion of the bearing ring with the sealing device is subjected to shot peening treatment and low friction treatment, and then the same. A rolling bearing characterized in that a raceway surface of a bearing ring is ground.

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