JP2022073924A - Rolling bearing, rotary device, and manufacturing method of rolling bearing - Google Patents

Abstract

To provide a rolling bearing which can achieve reduction of torque.SOLUTION: A bearing 1 includes: an inner ring 10 and an outer ring 20 disposed coaxially with each other; rolling elements 30 disposed between the inner ring 10 and the outer ring 20; a seal member for covering a space between the inner ring 10 and the outer ring 20 from an axial outer side; and filling grease 60 disposed between the rolling elements 30 and the seal member. The filling grease 60 has: a bearing ring contact part 61 disposed along a circumferential direction centered on a common axis O of the inner ring 10 and the outer ring 20 and contacting with the outer ring 20; and a seal member contact part 62 disposed along the circumferential direction and continuous with the bearing ring contact part 61 at the axial outer side and contacting with the seal member. At least one of the bearing ring contact part 61 and the seal member contact part 62 has grains 64, 65 disposed over an entire periphery in a dot-like manner.SELECTED DRAWING: Figure 2

Description

The present invention relates to rolling bearings, rotating equipment and methods for manufacturing rolling bearings.

Conventionally, there is a rolling bearing that holds grease between a pair of raceway rings (inner ring and outer ring). In this type of rolling bearing, the resistance of grease may be a factor in increasing torque. By the way, in rolling bearings, it is desired to reduce the torque for the purpose of saving power of the mounted rotating equipment. In particular, there is a strong demand for lower torque in small rolling bearings used in various motors such as fan motors.

Therefore, in order to reduce the torque of the rolling bearing, grease is applied to the axial end of the fixed ring (in many cases, the outer ring) of the rolling bearing and the seal member arranged on the end side, and the rolling element (rolling element). The amount of grease that comes into contact with the ball) and the cage that holds the rolling element is reduced (see, for example, Patent Document 1). In the rolling bearing described in Patent Document 1, the grease adheres to the inner peripheral surface avoiding the raceway surface in contact with the rolling element of the outer ring, and is on the inner peripheral surface side of the outer ring so as not to contact the outer peripheral surface of the inner ring. It is unevenly filled in an annular shape.

Japanese Unexamined Patent Publication No. 2013-204679

By the way, as a method of applying grease to a raceway ring in an annular shape, there is a method of relatively rotating the nozzle and the raceway ring while discharging grease from the nozzle. However, when the grease is applied in an annular shape over one round, the grease may gradually collapse due to its own weight immediately after the application. In this case, the grease may come into contact with the rolling elements and the cage more than necessary, and the torque of the rolling bearing may be larger than the desired torque.

Therefore, the present invention provides a rolling bearing, a rotating device, and a method for manufacturing a rolling bearing that can achieve low torque.

The rolling bearing of the present invention has an inner ring and an outer ring arranged coaxially with each other, a rolling element arranged between the inner ring and the outer ring, and a seal covering between the inner ring and the outer ring from the outside in the axial direction. A member and grease disposed between the rolling element and the seal member are provided, and the grease is arranged along a circumferential direction about a common axis of the inner ring and the outer ring, and the inner ring and the inner ring and the outer ring are provided. A bearing ring contact portion that is in contact with one of the outer rings and a seal member contact portion that is arranged along the circumferential direction and is connected to the raceway ring contact portion on the outside in the axial direction and is in contact with the seal member. At least one of the raceway ring contact portion and the seal member contact portion has particles arranged in dots over the entire circumference.

According to the present invention, when the desired amount of grease is filled, the raceway ring is formed by the amount of the raceway ring contact portion and the seal member contact portion, as compared with the case where the grease is applied only about once in a circumferential shape. The volume of the contact part can be reduced. Therefore, by forming the raceway ring contact portion before the seal member contact portion when applying grease, it is possible to prevent the raceway ring contact portion from collapsing due to its own weight. Further, by providing the seal member contact portion, the seal member contact portion is supported by the seal member, and the raceway ring contact portion is supported not only by one of the inner ring and the outer ring but also by the seal member via the seal member contact portion. Will be done. Therefore, the grease as a whole is less likely to collapse from the shape immediately after application due to its own weight. Therefore, it is possible to prevent the grease from coming into contact with the rolling elements and the cage more than necessary.
Here, attention is paid to one of the raceway ring contact portion and the seal member contact portion. According to the present invention, since the granules are supported by the inner ring, the outer ring or the seal member, and the other of the raceway ring contact portion and the seal member contact portion, the granules are arranged in a dot pattern only once along the circumferential direction. Compared with a configuration in which the grease is supported by one of the inner ring, the outer ring and the sealing member, the grease is less likely to collapse from the shape immediately after application due to its own weight. Further, as compared with the configuration in which the same amount of grease as the grease of the present invention is arranged in a circumferential shape, the parts of the grease that are close to the rolling element and the cage are scattered, so that the grease comes into contact with the rolling element and the cage. The amount of grease obtained can be reduced. Therefore, it is possible to prevent the grease from coming into contact with the rolling elements and the cage more than necessary.
Therefore, it is possible to achieve a low torque of the rolling bearing.
In addition, by ejecting grease from nozzles in which a plurality of ejection holes are formed in the circumferential direction to collectively form granules, the time required for applying grease is longer than in the method of applying grease in a circumferential shape. Can be shortened. Therefore, according to the present invention, at least one of the raceway ring contact portion and the seal member contact portion has granules arranged in dots over the entire circumference, and therefore, when the grease is applied twice in a circumferential shape. Compared with, the time required for applying grease can be shortened.

In the rolling bearing, both the raceway ring contact portion and the seal member contact portion may be arranged in a dot pattern.

According to the present invention, both the raceway ring contact portion and the seal member contact portion are less likely to collapse from the shape immediately after coating due to their own weight. Further, as compared with the configuration in which the same amount of grease as the grease of the present invention is arranged in a circumferential shape in each of the raceway ring contact portion and the seal member contact portion, the parts of the grease that are close to the rolling element and the cage are interspersed. Therefore, the amount of grease that can come into contact with the rolling elements and the cage can be reduced. Therefore, it is possible to achieve a low torque of the rolling bearing.

In the rolling bearing, the granules of the seal member contact portion may be arranged so as to be displaced in the circumferential direction with respect to the granules of the raceway ring contact portion.

According to the present invention, the seal member contact portion can be arranged so that the particles of the seal member contact portion enter between the pair of particles of the raceway ring contact portion. As a result, the seal member contact portion pressed from the outside in the axial direction by the seal member is compared with the configuration in which the granules of the raceway ring contact portion and the granules of the seal member contact portion are arranged so as not to be displaced from each other in the circumferential direction. This makes it difficult for the raceway ring contact portion to be pushed inward in the axial direction. Therefore, it is possible to prevent the raceway ring contact portion from collapsing from the shape immediately after coating.
Further, as compared with the configuration in which the particles of the raceway ring contact portion and the particles of the seal member contact portion are arranged so as not to be displaced from each other in the circumferential direction, the grease is suppressed from becoming large in the axial direction as a whole. The total amount of the whole can be increased.

In the rolling bearing, the same number of particles of the seal member contact portion may be provided as the particles of the raceway ring contact portion.

According to the present invention, a pair of particles of the sealing member contact portion come into contact with each of the particles of the raceway ring contact portion. As a result, the contact area between the raceway ring contact portion and the seal member contact portion is increased as compared with the configuration in which the particles of the raceway ring contact portion and the particles of the seal member contact portion are arranged so as not to be displaced from each other in the circumferential direction. It is possible to stably hold the raceway ring contact portion by the seal member contact portion in contact with the seal member. Therefore, it is possible to prevent the raceway ring contact portion from collapsing from the shape immediately after coating.

In the rolling bearing, the granules of the seal member contact portion may be formed smaller in the radial direction about the common axis than the granules of the raceway ring contact portion in contact with the granules. ..

According to the present invention, the volume of each particle in the raceway ring contact portion can be made smaller than the volume of each particle in the seal member contact portion. This makes it possible to reduce the amount of grease that can come into contact with the rolling elements and the cage at the raceway ring contact portion. Therefore, it is possible to prevent the grease from coming into contact with the rolling elements and the cage more than necessary.
Further, since the supporting force of the sealing member contacting portion by the sealing member increases due to the increase in the volume of each particle of the sealing member contacting portion, the holding force of the entire grease including the raceway ring contacting portion can be increased. Therefore, it is possible to prevent the grease from collapsing from its shape immediately after application due to its own weight.

In the rolling bearing, the raceway ring contact portion may have the granules, and the seal member contact portion may extend in a circumferential shape.

According to the present invention, the contact area between the seal member contact portion and the seal member can be increased as compared with the configuration in which the seal member contact portion has particles arranged in dots over the entire circumference, so that the seal can be sealed. It is possible to increase the supporting force of the contact portion of the seal member by the member. This makes it possible to increase the holding force of the entire grease including the raceway ring contact portion. Therefore, it is possible to prevent the grease from collapsing from its shape immediately after application due to its own weight.

In the rolling bearing, one of the inner ring and the outer ring may be provided as a fixed ring.

According to the present invention, since the grease comes into contact with the fixed wheel, it is possible to suppress the action of centrifugal force on the grease when the rolling bearing rotates, and it is possible to prevent the grease from collapsing from the shape immediately after application. Therefore, it is possible to achieve a low torque of the rolling bearing.

In the rolling bearing, one of the inner ring and the outer ring may be the outer ring.

According to the present invention, even if the grease rotates during the rotation of the rolling bearing and centrifugal force acts on the grease, the outer ring regulates the displacement of the grease to the outside in the radial direction. Can be kept. Therefore, it is possible to achieve a low torque of the rolling bearing.

In the rolling bearing, the seal member may be mounted on one of the inner ring and the outer ring.

According to the present invention, since one of the inner ring and the outer ring and the seal member are provided so as not to rotate relative to each other, it is possible to prevent the grease in contact with both of them from being agitated. Therefore, the grease can be kept in the shape immediately after application. Therefore, it is possible to achieve a low torque of the rolling bearing.

In the rolling bearing, even if the seal member contact portion is arranged on the side opposite to one of the inner ring and the outer ring in the radial direction about the common axis with respect to the raceway ring contact portion. good.

According to the present invention, a space for arranging the raceway ring contact portion on one side of the inner ring and the outer ring in the radial direction with respect to the seal member contact portion as compared with the configuration in which the raceway ring contact portion and the seal member contact portion are arranged in the axial direction. Is provided, and the raceway ring contact portion can be arranged outside in the axial direction. As a result, it is possible to prevent the grease from coming into contact with the rolling elements and the cage more than necessary. Therefore, it is possible to achieve a low torque of the rolling bearing.

The rolling bearing may further include other greases arranged on the rolling element in the axial direction opposite to the grease.

According to the present invention, it is possible to increase the total amount of grease placed on the bearing by the other grease while preventing the grease from losing its shape by interfering with the raceway ring contact portion and the seal member contact portion. .. Therefore, it is possible to provide a bearing having a long life.

The rotating device of the present invention includes a rotating body rotatably arranged, a support that rotatably supports the rotating body, and the rolling bearing interposed between the rotating body and the support. It is characterized by being prepared.

According to the present invention, since the rolling bearing having a low torque is provided, the rotational resistance of the rotating body with respect to the support can be reduced, and the power saving of the rotating device can be achieved.

The method for manufacturing a rolling bearing of the present invention is the above-mentioned method for manufacturing a rolling bearing, the first coating step of discharging grease from the first nozzle at the first coating position to form the raceway ring contact portion, and the above-mentioned. It is characterized by comprising a second coating step of discharging grease from a second nozzle different from the first nozzle at a second coating position different from the first coating position to form the sealing member contact portion.

According to the present invention, the cycle time at each coating position can be shortened. Therefore, the manufacturing efficiency of the bearing can be improved. Further, in the manufacturing method in which grease is applied in an annular shape while rotating the bearing, a mechanism for driving the nozzle in the radial direction with respect to the bearing is not required, so that the structure of the grease application device can be simplified.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a rolling bearing, a rotating device, and a method for manufacturing a rolling bearing that can achieve low torque.

It is a top view of the rolling bearing which concerns on 1st Embodiment. It is a top view of the rolling bearing which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a flowchart which shows the application method of the grease which concerns on 1st Embodiment. It is a top view explaining the method of applying grease. It is a top view explaining the method of applying grease. 6 is a cross-sectional view taken along the line VII-VII of FIG. It is a top view explaining the method of applying grease. It is sectional drawing in the IX-IX line of FIG. It is a top view of the rolling bearing which concerns on 2nd Embodiment. It is sectional drawing in the XI-XI line of FIG. It is sectional drawing of the rolling bearing which concerns on 3rd Embodiment. It is sectional drawing of the rolling bearing which concerns on 4th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. Then, the duplicate description of those configurations may be omitted.

[First Embodiment]
The first embodiment according to the present invention will be described with reference to FIGS. 1 to 9.
1 and 2 are plan views of the rolling bearing according to the first embodiment. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. Note that FIG. 2 omits the illustration of the seal member 50, which will be described later. Further, in FIG. 3, a member to which the rolling bearing 1 is mounted is shown by a virtual line.

As shown in FIGS. 1 to 3, the rolling bearing 1 includes an inner ring 10 and an outer ring 20 which are raceway rings, a plurality of rolling elements 30, a cage 40, a pair of sealing members 50, and a filling grease 60. It is a ball bearing equipped with. The rolling bearing 1 is provided in a rotating device 2 such as a fan motor. The rotating device 2 includes a shaft 3 (rotating body) rotatably formed around a common axis O, and a housing 4 (supporting body) that is fixedly set and rotatably supports the shaft 3. .. The rolling bearing 1 is interposed between the shaft 3 and the housing 4. In the following, rolling bearings may be simply referred to as bearings. Further, in the present embodiment, the grease in the state before being filled in the bearing 1 is simply referred to as grease, and the grease in the state of being filled in the bearing 1 by applying the grease is referred to as the filling grease 60.

The inner ring 10 and the outer ring 20 are arranged coaxially with each other so that their respective central axes are arranged on the common axis O. In the present embodiment, the direction in which the common axis O extends is referred to as an axial direction, the direction extending radially from the common axis O orthogonal to the common axis O is referred to as a radial direction, and the direction orbiting around the common axis O is referred to as a circumferential direction. ..

The inner ring 10 is provided as a rotating wheel. The inner ring 10 is externally attached to the shaft 3 and fixed to the shaft 3. The outer ring 20 is provided as a fixed ring. The outer ring 20 is fitted into the recess (or through hole) of the housing 4 and is fixed to the housing 4. The outer ring 20 surrounds the inner ring 10 from the outside in the radial direction in a state where an annular space is provided between the outer ring 20 and the inner ring 10. The plurality of rolling elements 30 are arranged between the inner ring 10 and the outer ring 20, and are rotatably held by the cage 40. The cage 40 rotatably holds each of the rolling elements 30 in a state where the plurality of rolling elements 30 are evenly arranged in the circumferential direction. The seal member 50 covers the annular space between the inner ring 10 and the outer ring 20 from the outside in the axial direction.

The outer ring 20 is formed in an annular shape by a metal material such as stainless steel or bearing steel. However, the outer ring 20 is not limited to being made of metal, and may be made of other materials. The outer ring 20 has an outer ring main body 21 having a width along the axial direction equal to the width along the axial direction of the inner ring 10, and a protruding portion 22 protruding inward in the radial direction from the outer ring main body 21. Have. The protruding portion 22 is formed in a portion of the outer ring main body 21 located at the center in the axial direction. The width of the protrusion 22 along the axial direction is shorter than the width of the outer ring body 21 along the axial direction and larger than the outer diameter of the rolling element 30.

An outer ring rolling surface 23 that is recessed toward the outside in the radial direction is formed on the inner peripheral surface of the protruding portion 22. The outer ring rolling surface 23 is formed in a hemispherical cross-sectional view along the outer surface of the rolling element 30, and is also formed in an annular shape extending in the circumferential direction over the entire circumference of the inner peripheral surface of the protrusion 22. There is. The outer ring rolling surface 23 is formed on a portion of the inner peripheral surface of the protruding portion 22 located at the center in the axial direction. The portion of the inner peripheral surface of the protruding portion 22 excluding the outer ring rolling surface 23 extends in the axial direction with a constant inner diameter. The protrusion 22 includes a pair of end faces 22a facing in the axial direction. Each end face 22a extends in parallel in both the radial and circumferential directions.

The outer ring main body 21 has a pair of inner peripheral surfaces 21a extending from the outer peripheral edge of each end surface 22a of the protrusion 22 to the opening edge of the outer ring 20. The portion of each inner peripheral surface 21a located inside in the axial direction is located outside in the radial direction than the portion located outside in the axial direction.

The inner ring 10 is formed in an annular shape by a metal material such as stainless steel or bearing steel. However, the inner ring 10 is not limited to being made of metal, and may be made of other materials. An inner ring rolling surface 11 that is recessed inward in the radial direction is formed on the outer peripheral surface of the inner ring 10. The inner ring rolling surface 11 is formed in a hemispherical cross-sectional view along the outer surface of the rolling element 30, and is also formed in an annular shape extending in the circumferential direction over the entire circumference of the outer peripheral surface. The inner ring rolling surface 11 is formed on a portion of the outer peripheral surface of the inner ring 10 located at the center in the axial direction, and is arranged so as to face the outer ring rolling surface 23 in the radial direction. The portion of the inner peripheral surface of the inner ring 10 excluding the inner ring rolling surface 11 extends in the axial direction with a constant outer diameter.

The plurality of rolling elements 30 are formed in a spherical shape by a metal material such as stainless steel or bearing steel. The plurality of rolling elements 30 are arranged between the outer ring rolling surface 23 and the inner ring rolling surface 11, and are rotatably supported by the outer ring rolling surface 23 and the inner ring rolling surface 11.

The cage 40 is formed in an annular shape as a whole by a synthetic resin or a metal material. The cage 40 is arranged around the common axis O. The cage 40 includes a main body portion 41 formed in an annular shape and arranged on the other side in the axial direction with respect to the plurality of rolling elements 30, and a pair of claw portions 42 rising from the main body portion 41 in the axial direction. And prepare. The pair of claws 42 rotatably holds one rolling element 30. The pair of claw portions 42 rise in an arc shape so that the distances from the main body portion 41 toward the tip thereof are close to each other. The cage 40 is arranged with a gap between the inner ring 10 and the outer ring 20 so as not to interfere with the inner ring 10 and the outer ring 20. In the present embodiment, the entire cage 40 is located inside the pair of end faces 22a of the protrusions 22 of the outer ring 20 in the axial direction.

The seal member 50 is formed in the shape of an annular plate. The seal member 50 is arranged around the common axis O. The seal member 50 is attached to the outer ring 20. One seal member 50 is arranged on each side in the axial direction with respect to the plurality of rolling elements 30. The seal member 50 includes a base portion 51 that overlaps the end surface 22a of the protruding portion 22 of the outer ring 20 from the outside in the axial direction, a step portion 52 extending outward from the inner peripheral edge of the base portion 51 in the axial direction, and an axially outer side of the step portion 52. The cover portion 53 projects radially inward from the edge of the base 51, and the locking portion 54 extends radially outward and axially outward from the outer peripheral edge of the base 51. The seal member 50 extends radially so as to straddle at least the center of the rolling element 30 in a plan view. In the present embodiment, the cover portion 53 overlaps the center of the rolling element 30 in a plan view. However, the step portion 52 may extend from the inner peripheral edge of the base portion 51 to the outside in the axial direction and the inside in the radial direction and overlap with the center of the rolling element 30 in a plan view. The inner peripheral edge of the cover portion 53 is arranged with a gap on the outer peripheral surface of the inner ring 10. The outer peripheral edge of the locking portion 54 is locked to the inner peripheral surface 21a of the outer ring main body 21 from the inside in the axial direction. As a result, the seal member 50 is fixed to the outer ring 20.

The filling grease 60 is arranged between the rolling element 30 and the sealing member 50. The filling grease 60 is arranged only on one side in the axial direction with respect to the rolling element 30 in the annular space between the inner ring 10 and the outer ring 20. In the present embodiment, the filling grease 60 is arranged on one side in the axial direction with respect to the rolling element 30. That is, the filled grease 60 is arranged on the side opposite to the main body 41 of the cage 40 with the rolling element 30 interposed therebetween in the axial direction. The filled grease 60 is arranged in an annular shape in a plan view and is arranged coaxially with the common axis O. The filling grease 60 is in contact with the outer ring 20 provided as a fixed ring and is separated from the inner ring 10 provided as a rotating ring. Further, the filled grease 60 is separated from the rolling element 30 and the cage 40. However, the filled grease 60 may be in contact with at least one of the rolling elements 30 and the cage 40.

The filling grease 60 includes a raceway ring contact portion 61 in contact with the outer ring 20 and a seal member contact portion 62 connected to the raceway ring contact portion 61 and in contact with the seal member 50, and is integrally formed. The raceway ring contact portion 61 is arranged along the circumferential direction at predetermined positions in the radial direction and the axial direction. The raceway ring contact portion 61 is in contact with a portion of the inner peripheral surface of the protruding portion 22 of the outer ring 20 that is axially outside the outer ring rolling surface 23. The seal member contact portion 62 is arranged along the circumferential direction at a predetermined position different from the raceway ring contact portion 61 in the radial direction and the axial direction. The seal member contact portion 62 is separated from the outer ring 20 of the raceway rings with which the raceway ring contact portion 61 is in contact. The seal member contact portion 62 is arranged on the side opposite to the outer ring 20 in the radial direction (that is, inside in the radial direction) with respect to the raceway ring contact portion 61. The seal member contact portion 62 is directly connected and integrated with the raceway ring contact portion 61 on the outer side in the axial direction. The seal member contact portion 62 is continuous over the entire circumference of the raceway ring contact portion 61. The seal member contact portion 62 is supported by the seal member 50 by coming into contact with the surface of the seal member 50 facing inward in the axial direction. The seal member contact portion 62 is in contact with the inner surface of the cover portion 53 of the seal member 50.

The raceway ring contact portion 61 has a first granular material 64 arranged in a dot shape over the entire circumference. The first granular material 64 is formed to have the same shape as each other. The first granular material 64 has a shape in which a part of spherical, ellipsoidal, or teardrop-shaped grease is in contact with surrounding members and crushed. As a result, the exposed portion of the outer surface of the first grain 64 is formed in a convex curved surface shape. The first granular material 64 is aligned in the circumferential direction. The pair of first granular materials 64 adjacent to each other in the circumferential direction are in contact with each other and integrated. In the illustrated example, the pair of adjacent first granular materials 64 are in point contact with each other, but they may be in contact with each other and crushed. However, the pair of first granular materials 64 adjacent to each other in the circumferential direction may be separated from each other. Each first granular material 64 is in contact with the outer ring 20. The contact portions between the first particle 64 and the outer ring 20 are arranged at intervals in the circumferential direction.

The seal member contact portion 62 has a second granular material 65 arranged in a dot shape over the entire circumference. The number of the second granular material 65 is the same as that of the first granular material 64. The second granular material 65 is formed to have the same shape as each other. The second granular material 65 has a shape in which a part of spherical, ellipsoidal, or teardrop-shaped grease is in contact with surrounding members and crushed. As a result, the exposed portion of the outer surface of the second granular material 65 is formed in a convex curved surface shape. Each second granular material 65 is aligned in the circumferential direction. Each of the second granular materials 65 is arranged so as to be displaced in the circumferential direction with respect to the first granular material 64. Specifically, each of the second granules 65 has an intermediate position between the centers of the pair of first granules 64 in which the straight lines passing through the center of the second granule 65 and the common axis O are adjacent to each other when viewed from the axial direction. Arranged to pass through. Each second granular material 65 is in contact with and integrated with the raceway ring contact portion 61. Each second granular material 65 is in contact with a pair of first granular materials 64. Each second granular material 65 is in contact with the sealing member 50. A pair of second granular materials 65 adjacent to each other in the circumferential direction are in contact with each other and integrated. However, the pair of second particles 65 adjacent to each other in the circumferential direction may be separated from each other. The second granular material 65 is formed larger in the radial direction than the first granular material 64. As a result, the volume of the second granular material 65 is larger than the volume of the first granular material 64.

Next, as a method of manufacturing the bearing 1 of the present embodiment, a method of applying grease will be described.
FIG. 4 is a flowchart showing a method of applying grease according to the first embodiment.
As shown in FIG. 4, the grease application method of the present embodiment includes a first application step S10 and a second application step S20.

5, FIG. 6 and FIG. 8 are plan views illustrating a method of applying grease. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG.
As shown in FIG. 5, the first coating step S10 is performed in a state where the sealing member 50 is not attached to the outer ring 20. That is, the annular space between the inner ring 10 and the outer ring 20 is opened in the axial direction, and grease is applied in a state where the rolling element 30 and the cage 40 are exposed.

As shown in FIGS. 6 and 7, in the first coating step S10, the first nozzle having a plurality of grease discharge holes formed in the circumferential direction is brought close to the outer ring 20, and the grease G1 is discharged from the first nozzle. At this time, the position of the first nozzle is adjusted so that the discharged grease G1 comes into contact with the axial end portion of the inner peripheral surface of the protruding portion 22 of the outer ring 20. The grease G1 discharged from each discharge hole becomes the first grain 64. As a result, the raceway ring contact portion 61 having the first granular material 64 is formed.

As shown in FIGS. 8 and 9, in the second coating step S20, the second nozzle having a plurality of grease discharge holes formed in the circumferential direction is brought close to the outer ring 20, and the grease G2 is discharged from the second nozzle. The second nozzle used in this step has a discharge hole formed inside the discharge hole of the first nozzle used in the first coating step S10 in the radial direction. The discharged grease G2 contacts the raceway ring contact portion 61 from the outside in the axial direction and the inside in the radial direction, and the applied grease G2 protrudes outward from the raceway ring contact portion 61 in the axial direction of the second nozzle. Adjust the position. The grease G2 discharged from each discharge hole becomes the second granular material 65. As a result, the seal member contact portion 62 having the second granular material 65 is formed.

With the above, the application of grease is completed. After that, the seal member 50 is inserted from the outside in the axial direction into the annular space between the inner ring 10 and the outer ring 20, and the seal member 50 is attached to the outer ring 20. At this time, the grease applied in the second coating step S20 comes into contact with the cover portion 53 of the sealing member 50, and the state shown in FIG. 2 is obtained.

As described above, the bearing 1 of the present embodiment is arranged along the circumferential direction and is arranged along the circumferential direction with the raceway ring contact portion 61 which is in contact with the outer ring 20, and is axial to the raceway ring contact portion 61. It is provided with a filling grease 60 having a seal member contact portion 62 which is connected to the outside in the direction and is in contact with the seal member 50. According to this configuration, when the desired amount of grease is filled, the raceway ring contact portion 61 and the seal member contact portion 62 are formed as compared with the case where the grease is applied only substantially once in a circumferential shape. The volume of the raceway ring contact portion 61 can be reduced. Therefore, by forming the raceway ring contact portion 61 before the seal member contact portion 62 when applying grease, it is possible to prevent the raceway ring contact portion 61 from collapsing due to its own weight. Further, by providing the seal member contact portion 62, the seal member contact portion 62 is supported by the seal member 50, and the raceway ring contact portion 61 is not only on the outer ring 20 but also on the seal member 50 via the seal member contact portion 62. Is also supported. Therefore, the filled grease 60 is less likely to collapse from the shape immediately after application due to its own weight as a whole. Therefore, it is possible to prevent the filled grease 60 from coming into contact with the rolling elements 30 and the cage 40 more than necessary.
Further, in the present embodiment, the raceway ring contact portion 61 has a first granular material 64 arranged in a dot shape over the entire circumference. According to this configuration, since the first grain 64 is supported by the outer ring 20 and the sealing member contact portion 62, the grease arranged in a dot pattern only once along the circumferential direction is applied to the inner ring 10, the outer ring 20, and the seal. Compared with the configuration supported by one of the members 50, the filled grease 60 is less likely to collapse from the shape immediately after application due to its own weight. The same applies to the seal member contact portion 62. Further, as compared with the configuration in which the same amount of grease as that of the filled grease 60 of the present embodiment is arranged in a circumferential shape, the parts of the filled grease 60 that are close to the rolling elements 30 and the cage 40 are scattered. The amount of grease that can come into contact with the moving body 30 and the cage 40 can be reduced. Therefore, it is possible to prevent the filled grease 60 from coming into contact with the rolling elements 30 and the cage 40 more than necessary.
Therefore, it is possible to achieve a low torque of the bearing 1.

Further, the second granular material 65 is arranged so as to be displaced in the circumferential direction with respect to the first granular material 64. According to this configuration, the seal member contact portion 62 can be arranged so that the second particle 65 is inserted between the pair of first particles 64. As a result, the raceway ring contact is made by the seal member contact portion 62 pushed from the outside in the axial direction by the seal member 50, as compared with the configuration in which the first particle and the second particle are arranged so as not to be displaced from each other in the circumferential direction. The portion 61 is less likely to be pushed inward in the axial direction. Therefore, it is possible to prevent the raceway ring contact portion 61 from collapsing from the shape immediately after coating.
Further, as compared with the configuration in which the first and second particles are arranged so as not to be displaced from each other in the circumferential direction, the filling grease 60 is suppressed from becoming large in the axial direction as a whole. The total amount of the whole can be increased.

Further, the number of the second granular material 65 is provided in the same number as that of the first granular material 64. According to this configuration, a pair of second granules 65 come into contact with each of the first granules 64. As a result, the contact area between the raceway ring contact portion 61 and the seal member contact portion 62 can be increased as compared with the configuration in which the first and second granules are arranged so as not to be displaced from each other in the circumferential direction, and the seal member can be increased. The raceway ring contact portion 61 can be stably held by the seal member contact portion 62 in contact with 50. Therefore, it is possible to prevent the raceway ring contact portion 61 from collapsing from the shape immediately after coating.

Further, the second granular material 65 is formed to be smaller in the radial direction than the first granular material 64 in contact with the second granular material 65. According to this configuration, the volume of each first particle 64 can be made smaller than the volume of each second particle 65. As a result, the amount of grease that can come into contact with the rolling elements 30 and the cage 40 at the raceway ring contact portion 61 can be reduced. Therefore, it is possible to prevent the filled grease 60 from coming into contact with the rolling elements 30 and the cage 40 more than necessary.
Further, since the supporting force of the sealing member contact portion 62 by the sealing member 50 increases due to the increase in the volume of each second particle 65, the holding force of the entire filling grease 60 including the raceway ring contact portion 61 is increased. Can be done. Therefore, the filled grease 60 can be prevented from collapsing from the shape immediately after application due to its own weight.

Further, the outer ring 20 which is a raceway ring with which the filling grease 60 comes into contact is provided as a fixed ring. According to this configuration, since the filled grease 60 comes into contact with the fixed wheel, it is possible to suppress the action of centrifugal force on the filled grease 60 when the bearing 1 is rotated, and it is possible to prevent the filled grease 60 from collapsing from the shape immediately after application. .. Therefore, it is possible to achieve a low torque of the bearing 1.

The seal member 50 is attached to an outer ring 20 which is a raceway ring with which the filling grease 60 comes into contact. According to this configuration, since the outer ring 20 and the seal member 50 are provided so as not to rotate relative to each other, it is possible to prevent the filling grease 60 in contact with both of them from being agitated. Therefore, the filled grease 60 can be kept in the shape immediately after application. Therefore, it is possible to achieve a low torque of the bearing 1.

The seal member contact portion 62 is arranged on the side opposite to the outer ring 20 in the radial direction with respect to the raceway ring contact portion 61. According to this configuration, a space for arranging the raceway ring contact portion 61 is provided on the radial outer side of the seal member contact portion 62 as compared with the configuration in which the raceway ring contact portion 61 and the seal member contact portion 62 are arranged in the axial direction. , The raceway ring contact portion 61 can be arranged outside in the axial direction. As a result, it is possible to prevent the filled grease 60 from coming into contact with the rolling elements 30 and the cage 40 more than necessary. Therefore, it is possible to achieve a low torque of the bearing 1.

Here, in the present embodiment, the outer peripheral edge of the seal member 50 is locked to the inner peripheral surface of the outer ring 20. In the conventional configuration in which the grease is arranged only about once in a circumferential shape, the grease is temporarily moved from the rolling element to the axial direction in order to prevent the grease from collapsing due to its own weight and coming into contact with the rolling element and the cage more than necessary. If the grease is placed farther from the outside of the seal member, the grease may be crushed by the seal member and leak from the gap between the outer peripheral edge of the seal member and the outer ring. According to the present embodiment, the seal member contact portion 62 located outside the raceway ring contact portion 61 in the axial direction is arranged on the side opposite to the outer peripheral edge of the seal member 50 with the raceway ring contact portion 61 interposed therebetween. It is possible to prevent the seal member contact portion 62 from leaking from the gap between the outer peripheral edge of the seal member 50 and the outer ring 20. Therefore, leakage of grease from the bearing 1 can be suppressed.

Since the rotating device 2 of the present embodiment includes the bearing 1 described above, the rotational resistance of the shaft 3 with respect to the housing 4 can be reduced, and the power saving of the rotating device 2 can be achieved.

In the method for manufacturing the bearing 1 of the present embodiment, it is desirable that the first coating step S10 and the second coating step S20 are performed at different coating positions. That is, the first coating step S10 is performed at the first coating position, the bearing after the first coating step S10 is conveyed to the second coating position, and the second coating step S20 is performed at the second coating position. Further, when the second coating step S20 is being performed, the first coating step S10 may be performed on the next bearing at the first coating position. According to this method, the cycle time at each coating position can be shortened. Therefore, the manufacturing efficiency of the bearing 1 can be improved.

[Second Embodiment]
A second embodiment according to the present invention will be described with reference to FIGS. 10 and 11.
FIG. 10 is a plan view of the rolling bearing according to the second embodiment. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. In FIG. 10, the seal member 50 is not shown in order to make it easier to see the internal configuration of the bearing 1A.
In the first embodiment shown in FIG. 2, the sealing member contact portion 62 of the filled grease 60 has a second granular material 65 arranged in dots over the entire circumference. On the other hand, the second embodiment shown in FIG. 10 is different from the first embodiment in that the seal member contact portion 62A extends in a circumferential shape. The configurations other than those described below are the same as those in the first embodiment.

As shown in FIGS. 10 and 11, the seal member contact portion 62A is arranged along the circumferential direction at a predetermined position different from the raceway ring contact portion 61 in the radial direction and the axial direction. The seal member contact portion 62A extends in a circumferential shape around the common axis O. The seal member contact portion 62A is separated from the outer ring 20. The inner peripheral edge of the seal member contact portion 62A is located radially inside the end edge of each first grain body 64 of the raceway ring contact portion 61 in the radial direction in a plan view. The seal member contact portion 62A is directly connected and integrated with the raceway ring contact portion 61 on the outer side in the axial direction. The seal member contact portion 62A is connected to all the first particles 64 of the raceway ring contact portion 61. The seal member contact portion 62A is supported by the seal member 50 by coming into contact with the surface of the seal member 50 facing inward in the axial direction. The seal member contact portion 62A is in contact with the inner surface of the cover portion 53 of the seal member 50.

The seal member contact portion 62A is formed by applying grease discharged from the nozzle in a circumferential shape of 360 ° or more. The seal member contact portion 62A extends continuously over the entire circumference so that an intermittent portion is not formed in a plan view. The seal member contact portion 62A extends from one peripheral end portion 62Aa about 360 ° or more and less than 720 ° about the common axis O to reach the other peripheral end portion 62Ab. As a result, the seal member contact portion 62A has a portion that overlaps with each other in a plan view. However, the seal member contact portion 62A may extend in an arc shape so that an intermittent portion is formed in a plan view.

According to this configuration, the contact area between the seal member contact portion 62A and the seal member 50 can be increased as compared with the configuration in which the seal member contact portion has particles arranged in dots over the entire circumference. , The bearing capacity of the seal member contact portion 62A by the seal member 50 can be increased. This makes it possible to increase the overall holding force of the filled grease 60 including the raceway ring contact portion 61. Therefore, the filled grease 60 can be prevented from collapsing from the shape immediately after application due to its own weight.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIG. The configurations other than those described below are the same as those in the first embodiment.

FIG. 12 is a cross-sectional view of the rolling bearing according to the third embodiment.
In the third embodiment shown in FIG. 12, the bearing 1B includes other grease 66 in addition to the filling grease 60. The other grease 66 is arranged on the side opposite to the filling grease 60 in the axial direction with respect to the rolling element 30. That is, the other grease 66 is arranged on the same side as the main body 41 of the cage 40 in the axial direction with respect to the rolling element 30. The other grease 66 is arranged between the rolling element 30 and the sealing member 50. The other grease 66 is arranged in the annular space between the inner ring 10 and the outer ring 20. The other grease 66 is in contact with the contact target (outer ring 20 in this embodiment) of the filled grease 60 among the inner ring 10 and the outer ring 20. Like the filled grease 60, the other grease 66 is in contact with one of the inner ring 10 and the outer ring 20 and is separated from the other. The other grease 66 is separated from the rolling element 30 and the cage 40. The other grease 66 extends in a circumferential shape around the common axis O. The other grease 66 is in contact with a portion of the inner peripheral surface of the protruding portion 22 of the outer ring 20 that is axially outer of the outer ring rolling surface 23.

However, the composition of other greases is not limited to the above configuration. The other grease may be in contact with the inner ring 10 and separated from the outer ring 20. Further, the other grease may be in contact with at least one of the rolling element 30 and the cage 40. Further, the other greases do not have to extend in a circumferential shape. For example, the other grease may extend in an arc shape or may be arranged in a dot shape along the circumferential direction.

According to the present embodiment, it is possible to increase the total amount of grease arranged on the bearing 1B by the other grease 66 while preventing the other grease 66 from interfering with the filled grease 60 and causing the filled grease 60 to lose its shape. .. Therefore, it is possible to provide the bearing 1B having a long life.

[Fourth Embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. The configurations other than those described below are the same as those in the first embodiment.

FIG. 13 is a cross-sectional view of the rolling bearing according to the fourth embodiment.
In the fourth embodiment shown in FIG. 13, the bearing 1C includes other grease 67 in addition to the filling grease 60. The other grease 67 is supported by the cage 40. The other grease 67 is arranged in the pocket between the pair of claw portions 42 on the side of the cage 40 opposite to the rolling element 30 with the claw portion 42 interposed therebetween. In the illustrated example, the other grease 67 is in contact with the main body 41 of the cage 40, but may be in contact with the claw 42. The other grease 67 is separated from the rolling element 30 and the filling grease 60. The other grease 67 may be arranged in all the pockets of the cage 40, or may be arranged only in a part of the pockets.

According to this embodiment, the total amount of grease arranged on the bearing 1C can be increased by another grease 67. Therefore, it is possible to provide the bearing 1C having a long life.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, the inner ring 10 is provided as a rotating ring, and the outer ring 20 is provided as a fixed ring. Then, the filled grease 60 is in contact with the outer ring 20 which is a fixed ring. However, the raceway ring to which the filled grease comes into contact does not have to be a fixed wheel. That is, the inner ring may be provided as a fixed ring, the outer ring may be provided as a rotating ring, and the filled grease may be in contact with the inner ring which is the fixed ring. Further, the inner ring may be provided as a fixed ring, the outer ring may be provided as a rotating ring, and the filled grease may be in contact with the outer ring which is a rotating ring. In this case, the filled grease rotates together with the outer ring, but even if centrifugal force acts on the filled grease, the outer ring regulates the displacement of the grease to the outside in the radial direction. can. However, it is desirable that the filled grease is in contact with the raceway ring to which the seal member is attached among the inner ring and the outer ring.

Further, in the above embodiment, grease is discharged from a nozzle having a plurality of discharge holes formed in the circumferential direction to collectively form granules, but grease is discharged from a nozzle having a single discharge hole. Granules may be formed one by one. Even in this case, it is desirable to perform the step of forming the raceway ring contact portion 61 and the step of forming the seal member contact portion 62 at different coating positions. Then, while the step of forming the seal member contact portion 62 is being performed, the step of forming the raceway ring contact portion 61 on the next bearing may be performed. However, by forming the granules collectively, the time required for applying the grease can be shortened as compared with the method of forming the granules one by one and the method of applying the grease in a circumferential shape.

Further, in the above embodiment, the same number of first granules 64 and second granules 65 of the filling grease 60 are provided, but the number of the first granules and the second granules is not particularly limited. For example, half of the first granules may be provided as the second granules.

Further, in the above embodiment, the second granules 65 of the filled grease 60 are arranged so as to be offset in the circumferential direction with respect to the first granules 64, but the positional relationship between the first granules and the second granules is this. Not limited to. For example, the second granule may be arranged with respect to the first granule so that the first and second granules are arranged in the radial direction.

Further, in the above embodiment, the raceway ring contact portion 61 of the filled grease 60 has the first particle 64 arranged in a dot shape, but the raceway ring contact portion extends in a circumferential shape and is in contact with the seal member. The portions may have granules arranged in dots.

Further, in the above embodiment, the raceway ring contact portion 61 and the seal member contact portions 62, 62A are directly connected, but the raceway ring contact portion and the seal member contact portion may be indirectly connected and integrated. In this case, it is desirable that grease is arranged along the circumferential direction between the raceway ring contact portion and the seal member contact portion as in the raceway ring contact portion and the seal member contact portion, and the grease is formed in a circumferential shape. It may be elongated or may have granules arranged in dots.

Further, in the above embodiment, the fan motor is exemplified as the rotating device, but the rotating device is not limited to this. For example, the present invention may be applied to at least one of a spindle motor and a swing arm of a hard disk drive as a rotating device.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention, and the above-mentioned embodiments may be combined as appropriate. For example, the other grease 66 of the third embodiment or the other grease 67 of the fourth embodiment may be arranged on the bearing 1A of the second embodiment.

1,1A, 1B, 1C ... Rolling bearing 2 ... Rotating equipment 3 ... Shaft (rotating body) 4 ... Housing (support) 10 ... Inner ring 20 ... Outer ring 30 ... Rolling body 50 ... Sealing member 60 ... Filling grease (grease) 61 ... Track ring contact part 62, 62A ... Seal member contact part 64 ... First grain (grain) 65 ... Second grain (grain) 66 ... Other grease O ... Common axis

Claims (13)

Inner and outer rings arranged coaxially with each other,
A rolling element arranged between the inner ring and the outer ring,
A sealing member that covers between the inner ring and the outer ring from the outside in the axial direction,
Grease placed between the rolling element and the sealing member, and
Equipped with
The grease is
A raceway ring contact portion arranged along the circumferential direction centered on the common axis of the inner ring and the outer ring and in contact with one of the inner ring and the outer ring.
A seal member contact portion that is arranged along the circumferential direction, is connected to the raceway ring contact portion on the outside in the axial direction, and is in contact with the seal member.
Have,
At least one of the raceway ring contact portion and the seal member contact portion has granules arranged in dots over the entire circumference.
Rolling bearings. Both the raceway ring contact portion and the seal member contact portion are arranged in a dot pattern.
The rolling bearing according to claim 1. The granules of the seal member contact portion are arranged so as to be displaced in the circumferential direction with respect to the granules of the raceway ring contact portion.
The rolling bearing according to claim 2. The number of the particles in the contact portion of the seal member is the same as the number of the particles in the contact portion of the raceway ring.
The rolling bearing according to claim 3. The granules of the seal member contact portion are formed smaller in the radial direction about the common axis than the granules of the raceway ring contact portion in contact with the granules.
The rolling bearing according to any one of claims 2 to 4. The raceway ring contact portion has the granules and has the particles.
The sealing member contact portion extends in a circumferential shape.
The rolling bearing according to claim 1. One of the inner ring and the outer ring is provided as a fixed ring.
The rolling bearing according to any one of claims 1 to 6. One of the inner ring and the outer ring is the outer ring.
The rolling bearing according to any one of claims 1 to 7. The seal member is attached to one of the inner ring and the outer ring.
The rolling bearing according to any one of claims 1 to 8. The seal member contact portion is arranged on the side opposite to one of the inner ring and the outer ring in the radial direction centered on the common axis with respect to the raceway ring contact portion.
The rolling bearing according to any one of claims 1 to 9. Further comprising another grease arranged on the rolling element on the side opposite to the grease in the axial direction.
The rolling bearing according to any one of claims 1 to 10. Rotating bodies arranged rotatably and
A support that rotatably supports the rotating body and a support
The rolling bearing according to any one of claims 1 to 11, which is interposed between the rotating body and the support.
Rotating equipment equipped with. The method for manufacturing a rolling bearing according to any one of claims 1 to 11.
In the first coating step of forming the raceway ring contact portion by discharging grease from the first nozzle at the first coating position,
A second coating step of ejecting grease from a second nozzle different from the first nozzle at a second coating position different from the first coating position to form the sealing member contact portion.
A method of manufacturing rolling bearings.

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