JP2023154360A - rolling bearing - Google Patents

Abstract

To provide a rolling bearing which can inhibit a lubricant in the bearing from emitting dust.SOLUTION: A rolling bearing 1 includes: an outer ring 11; an inner ring 12; multiple balls 13 disposed between the outer ring 11 and the inner ring 12 in a rollable manner; and a pair of annular shields 20 which is attached to both axial sides of the outer ring 11 to inhibit a lubricant at a bearing interior S1 from flowing out to a bearing exterior S2. The shield 20 has: an annular inner shield plate 21 in which an outer peripheral surface is attached to the outer ring 11 and an inner peripheral surface is disposed spaced apart from an outer peripheral surface of the inner ring 12; an annular outer shield plate 24 in which an outer peripheral surface is attached to the outer ring 11 at the axial outer side relative to the inner shield plate 21 and an inner peripheral surface is disposed spaced apart from the outer peripheral surface of the inner ring 12; and an annular adsorbent 27 which is sandwiched between the inner shield plate 21 and the outer shield plate 24 and may adsorb the lubricant.SELECTED DRAWING: Figure 1

Description

The present invention relates to rolling bearings.

A typical rolling bearing includes an inner ring, an outer ring, a plurality of rolling elements, and a cage that holds these rolling elements. In addition, in order to prevent water and foreign matter from entering the bearing from outside the bearing, where the rolling elements are located, and to prevent grease inside the bearing from flowing out, the rolling element is equipped with an annular shield. Bearings are known (for example, see Patent Document 1). The outer periphery of the shield is attached to both sides of the fixed ring (outer ring) in the axial direction. The inner peripheral surface of the shield is arranged with a small gap between it and the outer peripheral surface of the rotating ring (inner ring).

Japanese Patent Application Publication No. 2008-51304

In the rolling bearing as described above, the grease inside the bearing is scattered from the axial center to both sides in the axial direction by the rolling of the rolling elements. Most of the grease scattered on both sides in the axial direction is blocked by the shield, thereby preventing it from flowing out of the bearing. However, some of the grease becomes a fine mist from the gap between the shield and the inner ring and is emitted to the outside of the bearing. If the outside of the bearing is a clean room or the like where a clean environment is required, there is a risk that the mist generated from the rolling bearing may have an adverse effect on other equipment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing that can suppress dust generation of lubricant inside the bearing to the outside of the bearing.

(1) The rolling bearing of the present invention includes a fixed ring, a rotating ring, a plurality of rolling elements arranged so as to be able to roll between the fixed ring and the rotating ring, and a lubricant inside the bearing to the outside of the bearing. a pair of annular shields attached to both sides of the fixed ring in the axial direction to suppress leakage, the shield having one of an inner circumferential surface and an outer circumferential surface of the fixed ring an annular inner shield plate, the other circumferential surface of which is disposed with a gap from the circumferential surface of the rotating ring; an annular outer shield plate having one circumferential surface attached to the fixed ring and the other circumferential surface disposed with a gap from the circumferential surface of the rotating ring; the inner shield plate; and the outer shield plate. and an annular adsorbent that is sandwiched between the lubricant and the plate and is capable of adsorbing the lubricant.

According to the above-mentioned rolling bearing, most of the lubricant scattered axially outward due to the rolling of the rolling elements inside the bearing is blocked by the inner shield plate, thereby suppressing its outflow to the outside of the bearing. Further, an adsorbent capable of adsorbing lubricant is sandwiched between the inner shield plate and the outer shield plate. Therefore, even if some of the lubricant inside the bearing becomes mist and dust from the gap between the inner shield plate and the rotating ring toward the outer shield plate, the mist can be absorbed by the adsorbent. Thereby, it is possible to suppress the lubricant inside the bearing from being generated to the outside of the bearing from the gap between the outer shield plate and the rotating ring.

(2) In the rolling bearing of (1) above, a portion of the inner shield plate that approaches the rotating ring is provided with an annular inclined surface that slopes inward in the axial direction toward the rotating ring. preferable.
In this case, on the rotating wheel side inside the bearing, the lubricant scattered axially outward due to the rolling of the rolling elements tends to flow from the rotating wheel side to the stationary wheel side along the inclined surface of the inner shield plate. Thereby, the amount of mist generated from the scattered lubricant toward the outer shield plate side can be suppressed. As a result, it is possible to further suppress the lubricant inside the bearing from generating dust to the outside of the bearing.

(3) In the rolling bearing of (1) or (2) above, one of the inner shield plate and the outer shield plate is connected to the circumferential surface of the fixed ring and the suction It has a short cylindrical protrusion that protrudes in the axial direction between the circumferential surface of the material and comes into contact with the other shield plate, and the protrusion has a short cylindrical protrusion that absorbs the adsorbent by the inner shield plate and the outer shield plate. It is preferable that the clamping interval is regulated to be less than a predetermined value.
In this case, when the adsorbent is held between both shield plates, the protrusion of one shield plate comes into contact with the other shield plate, thereby preventing the adsorbent from being excessively compressed in the axial direction. can. This can prevent the mist adsorption function of the adsorbent from being significantly degraded.

(4) In the rolling bearing of (3) above, the inner shield plate has its axially inner side surface abutted against a step surface provided on the fixed ring, so that the inner shield plate is restricted from moving inwardly in the axial direction. Preferably, the axially outer side surface of the outer shield plate is in contact with an annular regulating member attached to the fixed ring, so that the outer shield plate is prevented from moving outward in the axial direction.
In this case, by attaching the regulating member to the fixed ring, the inner shield plate, the adsorbent, and the outer shield plate can be positioned in the axial direction between the step surface of the fixed ring and the regulating member. Therefore, the shield can be easily attached to the outer ring.

(5) In the rolling bearing according to any one of (1) to (4) above, it is preferable that a plurality of adsorbents are provided in line in the axial direction.
In this case, the mist adsorption efficiency can be increased by using a plurality of adsorbents.
(6) In the rolling bearing according to (5) above, the plurality of adsorbents include a first adsorbent and a second adsorbent disposed axially inside the first adsorbent, and The diameter of the circumferential surface of the second adsorbent on the rotating wheel side is preferably larger than the diameter of the circumferential surface of the first adsorbent on the rotating wheel side.
In this case, an annular space is formed between the inner shield plate and the first adsorbent, closer to the rotating wheel than the second adsorbent. Therefore, the mist generated from the gap between the inner shield plate and the rotary wheel flows toward the fixed wheel due to the wind force accompanying the rotation of the rotary wheel, and tends to accumulate in the space. Thereby, it is possible to further suppress the lubricant inside the bearing from being generated to the outside of the bearing from the gap between the outer shield plate and the rotating ring. Moreover, the mist in the space is adsorbed by the first adsorbent from its axially inner side surface, and by the second adsorbent from its circumferential surface on the rotating wheel side. Thereby, the mist in the space can be efficiently adsorbed by the first adsorbent and the second adsorbent.

According to the present invention, it is possible to suppress the lubricant inside the bearing from generating dust to the outside of the bearing.

FIG. 1 is a cross-sectional view showing a rolling bearing according to a first embodiment. FIG. 3 is an enlarged cross-sectional view showing the shield. FIG. 7 is a sectional view showing a rolling bearing according to a second embodiment. FIG. 7 is a sectional view showing a rolling bearing according to a third embodiment.

Hereinafter, preferred embodiments will be described with reference to the drawings.
[First embodiment]
<Configuration of rolling bearing>
FIG. 1 is a sectional view showing a rolling bearing 1 according to a first embodiment. The rolling bearing 1 is, for example, a ball bearing with an alignment ring, and is used for the purpose of absorbing deflection of a shaft of mechanical equipment. The rolling bearing 1 includes an alignment ring 10, an outer ring 11, an inner ring 12, a plurality of balls (rolling elements) 13, a cage 14, a pair of shields 20, and a pair of regulating members 30. Note that the rolling bearing 1 may be a deep groove ball bearing, an angular ball bearing, a cylindrical roller bearing, or the like.

In this specification, the direction along the central axis C of the rolling bearing 1 is the axial direction of the rolling bearing 1, and is simply referred to as the "axial direction." The axial direction also includes a direction parallel to the central axis C. In FIG. 1, the direction from the axial center of the rolling bearing 1 to both axial sides is referred to as the "axially outer" direction, and the direction from the axially opposite sides of the rolling bearing 1 toward the axial center is referred to as the "axially inner". The direction perpendicular to the central axis C is the radial direction of the rolling bearing 1, and is simply referred to as the "radial direction." The direction in which the rotating ring (inner ring 12 in this embodiment) of the rolling bearing 1 rotates about the central axis C is the circumferential direction of the rolling bearing 1, and is simply referred to as the "circumferential direction."

The alignment ring 10 is an annular member made of bearing steel, machine structural steel, or the like. A concave spherical surface 10a is formed on the inner periphery of the alignment ring 10. Further, a notch 10b is formed in a part of the inner circumference of the alignment ring 10 in the circumferential direction.

The outer ring 11 is an annular member made of bearing steel, machine structural steel, or the like. The outer ring 11 is a fixed ring. Note that the outer ring 11 may be a rotating ring. A convex spherical surface 11a is formed on the outer periphery of the outer ring 11 and is in surface contact with the concave spherical surface 10a of the alignment ring 10. The center point of the convex spherical surface 11a coincides with the center point of the concave spherical surface 10a. When a load is applied that causes the central axis of the outer ring 11 to be inclined with respect to the central axis of the aligning ring 10, slippage occurs between the concave spherical surface 10a and the convex spherical surface 11a, and the outer ring 11 swings relative to the aligning ring 10. It is supposed to be done. In other words, the rolling bearing 1 has an alignment function.

An outer ring raceway surface 11b is formed at the axial center of the inner circumference of the outer ring 11 over the entire circumferential direction. The outer ring raceway surface 11b is a raceway surface on which the balls 13 roll. Annular notches 11c are formed at both axial ends of the inner circumference of the outer ring 11, respectively. The cutout portion 11c has a stepped surface 11d that is flat in the radial direction and a circumferential surface 11e that is flat in the axial direction. The circumferential surface 11e is formed from the radially outer end of the stepped surface 11d to the axially outer side surface of the outer ring 11.

The inner ring 12 is an annular member made of bearing steel, machine structural steel, or the like. Inner ring 12 is a rotating ring. Note that the inner ring 12 may be a fixed ring. An inner ring raceway surface 12b is formed at the axial center of the outer circumference of the inner ring 12 over the entire circumferential direction. The inner ring raceway surface 12b is a raceway surface on which the balls 13 roll. Circumferential surfaces 12c that are flat in the axial direction are formed on both sides of the inner ring raceway surface 12b on the outer periphery of the inner ring 12 in the axial direction. The circumferential surface 12c is formed from the axially outer end of the inner ring raceway surface 12b to the axially outer side surface of the inner ring 12.

The plurality of balls 13 are arranged between the outer ring 11 and the inner ring 12. The balls 13 of this embodiment are made of bearing steel, machine structural steel, or the like. Each ball 13 rolls on an outer ring raceway surface 11b and an inner ring raceway surface 12b.

The cage 14 is, for example, a member made of synthetic resin. The retainer 14 includes a pair of annular bodies 15 arranged on both sides of the ball 13 in the axial direction, and a plurality of columns 16 that connect the pair of annular bodies 15. The plurality of pillars 16 are arranged at equal intervals throughout the circumferential direction of the annular body 15. A pocket 17 for accommodating each ball 13 is formed between a pair of annular bodies 15 and between a pair of adjacent pillars 16. Thereby, the holder 14 holds the plurality of balls 13 at equal intervals along the circumferential direction.

The pair of shields 20 are arranged on both sides in the axial direction between the outer ring 11 and the inner ring 12. Each shield 20 is formed in an annular shape as a whole. The pair of shields 20 prevents lubricant (lubricating oil, grease, etc.) sealed in the bearing interior S1 between the outer ring 11 and the inner race 12 from flowing out to the bearing exterior S2. The pair of shields 20 are attached to the notches 11c on both sides of the outer ring 11 in the axial direction. The pair of regulating members 30 position each shield 20 in the axial direction with respect to the outer ring 11.

<Shield configuration>
FIG. 2 is an enlarged cross-sectional view showing the shield 20. As shown in FIG. The shield 20 includes an inner shield plate 21, an outer shield plate 24, and a plurality of adsorbents 27. The inner shield plate 21 is, for example, an annular plate member made of metal. The inner shield plate 21 has an annular main body portion 22 and a short cylindrical protrusion portion 23 .

The protruding portion 23 protrudes axially outward from the radially outer end of the main body portion 22 . The protrusion 23 of this embodiment protrudes axially outward between the circumferential surface 11e of the notch 11c of the outer ring 11 and the outer circumferential surface of a protrusion 26 (described later) of the inner shield plate 21. The outer circumferential surface of the protrusion 23 is fitted into the circumferential surface 11e of the notch 11c. Thereby, the inner shield plate 21 is attached to the outer ring 11. The length of the protrusion 23 in the axial direction is shorter than the length of the circumferential surface 11e in the axial direction.

The radially outer side of the axially inner inner surface (side surface) 22a of the main body portion 22 is in contact with the step surface 11d of the notch portion 11c. Thereby, the inner shield plate 21 is restricted from moving inward in the axial direction. An annular inclined surface 22a1 is formed on the radially inner side of the side surface 22a of the main body portion 22 (the portion approaching the inner ring 12). The inclined surface 22a1 is inclined axially inward toward the radially inner end of the main body portion 22, that is, toward the inner ring 12. The inner circumferential surface of the main body portion 22 is arranged with a small gap from the circumferential surface 12c of the inner ring 12.

The outer shield plate 24 is an annular plate member made of metal, for example. The outer shield plate 24 is arranged axially outer than the inner shield plate 21. The outer shield plate 24 has an annular main body portion 25 and a short cylindrical protrusion portion 26 .

The protruding portion 26 protrudes axially inward from the radially outer end of the main body portion 25 . The protrusion 26 of this embodiment protrudes inward in the axial direction between the inner circumferential surface of the protrusion 23 of the inner shield plate 21 and the outer circumferential surface of each adsorbent 27 . The outer circumferential surface of the protrusion 26 is fitted into the inner circumferential surface of the protrusion 23 of the inner shield plate 21 . Thereby, the outer shield plate 24 is attached to the outer ring 11 via the inner shield plate 21.

The axially inner protruding end 26a of the protruding portion 26 is in contact with the axially outer outer surface 22b of the main body portion 22 of the inner shield plate 21. As a result, the outer shield plate 24 is restricted from moving inward in the axial direction. The inner circumferential surface of the main body portion 25 is disposed with a small gap from the circumferential surface 12c of the inner ring 12. The inner diameter of the main body portion 25 is approximately the same as the inner diameter of the main body portion 22 of the inner shield plate 21.

Each of the plurality of adsorbents 27 is an annular member. The plurality of adsorbents 27 are sandwiched between the main body portion 22 of the inner shield plate 21 and the main body portion 25 of the outer shield plate 24 in a state in which they are closely aligned in the axial direction. The protrusion 26 of the outer shield plate 24 has its protruding end 26 a in contact with the outer surface 22 b of the inner shield plate 21 , so that the inner shield plate 21 and the outer shield plate 24 sandwich the plurality of adsorbents 27 in the axial direction. It is regulated that the interval L1 becomes less than a predetermined value. The interval L1 in this embodiment is the length of the protrusion 26 in the axial direction. The predetermined value is a value at which each adsorbent 27 is not excessively compressed in the axial direction by the inner shield plate 21 and the outer shield plate 24.

The adsorbent 27 is made of a material capable of adsorbing lubricant. The adsorbent 27 of this embodiment is made of a nonwoven fabric, such as felt, in which a large number of pores are formed by intertwining fibers. Preferably, the average pore size of the nonwoven fabric is about 300 μm. The adsorbent 27 is configured to adsorb the lubricant by allowing the lubricant to enter into a large number of pores inside the adsorbent. Note that the adsorbent material 27 is not limited to a nonwoven fabric, and may be, for example, pumice stone in which a large number of pores are formed.

The plurality of adsorbents 27 include a first adsorbent 27A arranged on the outer side in the axial direction and a second adsorbent 27B arranged on the inner side in the axial direction. The outer peripheral surface of the first adsorbent 27A is fitted into the inner peripheral surface of the protrusion 26 of the outer shield plate 24. The inner diameter (diameter of the inner circumferential surface) D1 of the first adsorbent 27A is slightly larger than the inner diameter of the main body portion 25 of the outer shield plate 24. Thereby, the inner circumferential surface of the first adsorbent 27A is arranged with a gap between it and the circumferential surface 12c of the inner ring 12.

The outer peripheral surface of the second adsorbent 27B is fitted into the inner peripheral surface of the protrusion 26 of the outer shield plate 24. The inner diameter (diameter of the inner peripheral surface) D2 of the second adsorbent 27B is larger than the inner diameter D1 of the first adsorbent 27A. Thereby, an annular space S3 is formed between the inner shield plate 21 and the first adsorbent 27A on the radially inner side than the second adsorbent 27B. Note that the number of adsorbents 27 may be only one, or three or more.

The regulating member 30 is, for example, an annular snap ring made of metal. The outer diameter of the regulating member 30 is larger than the outer diameter of the circumferential surface 11e of the notch 11c in the outer ring 11. An annular groove 11f is formed in the circumferential surface 11e of the notch 11c. As described above, with the main body 22 of the inner shield plate 21 in contact with the step surface 11d and the protrusion 26 of the outer shield plate 24 in contact with the main body 22 of the inner shield plate 21, the regulation member 30 is moved in the radial direction. The outer end portion is fitted into the groove 11f of the outer ring 11. Thereby, the regulating member 30 is attached to the outer ring 11, and its movement in both directions in the axial direction is regulated.

The inner diameter of the regulating member 30 is smaller than the outer diameter of the main body part 25 of the outer shield plate 24 and larger than the inner diameter of the main body part 25. The axially outer inner surface 30a of the regulating member 30 is in contact with the axially outer outer surface (side surface) 25b of the main body portion 25 of the outer shield plate 24. Thereby, the outer shield plate 24 is restricted from moving outward in the axial direction. The protruding end 23 a of the protruding portion 23 of the inner shield plate 21 is also in contact with the inner surface 30 a of the regulating member 30 . Note that the protruding portion 23 may be formed short in the axial direction so that the protruding end 23a thereof does not come into contact with the inner surface 30a of the regulating member 30.

With the above configuration, the inner shield plate 21 is sandwiched between the step surface 11d of the outer ring 11 and the protrusion 26 (projection end 26a) of the outer shield plate 24, and between the step surface 11d and the regulating member 30. movement in the axial direction is restricted. The first adsorbent 27A and the second adsorbent 27B are sandwiched between the main body 22 of the inner shield plate 21 and the main body 25 of the outer shield plate 24, and their movement in the axial direction is restricted. The outer shield plate 24 is sandwiched between the main body portion 22 of the inner shield plate 21 and the regulating member 30, and its movement in the axial direction is regulated. Therefore, by attaching the regulating member 30 to the concave groove 11f of the outer ring 11, all the constituent members of the shield 20 (inner shield plate 21, first adsorbent 27A, , the second adsorbent 27B, and the outer shield plate 24) are positioned in the axial direction.

<Effect>
According to the rolling bearing 1 of this embodiment, most of the lubricant scattered axially outward due to the rolling of the balls 13 in the bearing interior S1 is blocked by the inner shield plate 21 and flows out to the bearing exterior S2. is suppressed. Further, an adsorbent 27 capable of adsorbing lubricant is sandwiched between the inner shield plate 21 and the outer shield plate 24. Therefore, even if a part of the lubricant inside the bearing S1 becomes mist and dust from the gap between the inner shield plate 21 (main body part 22) and the inner ring 12 toward the outer shield plate 24, the mist is transferred to the adsorbent. 27 can be adsorbed. Thereby, it is possible to suppress the lubricant in the bearing interior S1 from generating dust from the gap between the outer shield plate 24 (main body portion 25) and the inner ring 12 to the bearing exterior S2.

Furthermore, on the inner ring 12 side of the bearing interior S1, the lubricant scattered axially outward due to the rolling of the balls 13 tends to flow from the inner ring 12 side to the outer ring 11 side along the inclined surface 22a1 of the inner shield plate 21. This makes it possible to suppress the amount of mist generated from the scattered lubricant toward the outer shield plate 24 side. As a result, it is possible to further suppress the lubricant inside the bearing S1 from generating dust to the outside S2 of the bearing.

Further, when the adsorbent 27 is held between both shield plates 21 and 24, the protrusion 26 of the outer shield plate 24 comes into contact with the inner shield plate 21 (main body part 22), so that the adsorbent 27 is moved in the axial direction. It is possible to prevent the data from being excessively compressed. This can prevent the mist adsorption function of the adsorbent 27 from being significantly degraded.

Moreover, by attaching the regulating member 30 to the outer ring 11, all the constituent members of the shield 20 are positioned between the step surface 11d of the outer ring 11 and the regulating member 30 in the axial direction. Therefore, the shield 20 can be easily attached to the outer ring 11.

Further, since a plurality of adsorbents 27 are sandwiched between the inner shield plate 21 (main body part 22) and the outer shield plate 24 (main body part 25), the efficiency of adsorption of mist can be increased.

Further, an annular space S3 is formed between the inner shield plate 21 and the first adsorbent 27A, closer to the inner ring 12 than the second adsorbent 27B. Therefore, the mist generated from the gap between the inner shield plate 21 and the inner ring 12 flows toward the outer ring 11 side due to the wind force generated by the rotation of the inner ring 12, and tends to accumulate in the space S3. Thereby, it is possible to further suppress the lubricant in the bearing interior S1 from generating dust from the gap between the outer shield plate 24 and the inner ring 12 to the bearing exterior S2. Moreover, the mist in the space S3 is adsorbed by the first adsorbent 27A from its axially inner side surface, and is adsorbed by the second adsorbent 27B from its inner peripheral surface. Thereby, the mist in the space S3 can be efficiently adsorbed by the first adsorbent 27A and the second adsorbent 27B.

[Second embodiment]
FIG. 3 is a sectional view showing the main parts of the rolling bearing 1 according to the second embodiment. The rolling bearing 1 of this embodiment is different from the first embodiment in the shape of the inner shield plate 21 of the shield 20. The inner shield plate 21 of this embodiment is comprised only of the main body part 22. The outer circumferential surface of the main body portion 22 is fitted into the circumferential surface 11e of the notch portion 11c. Thereby, the inner shield plate 21 is attached to the outer ring 11.

The outer circumferential surface of the protrusion 26 of the outer shield plate 24 is fitted into the circumferential surface 11e of the notch 11c. Thereby, the outer shield plate 24 is attached to the outer ring 11. The protruding end 26a of the protruding portion 26 of the outer shield plate 24 is in contact with the outer surface 22b of the main body portion 22 of the inner shield plate 21. The inner shield plate 21 is sandwiched between the step surface 11d of the outer ring 11 and the protrusion 26 of the outer shield plate 24, and its movement in the axial direction is restricted.

The other configurations of this embodiment are the same as those of the first embodiment, so the same reference numerals are given and the explanation thereof will be omitted. The rolling bearing 1 of this embodiment also has the same effects as the first embodiment.

[Third embodiment]
FIG. 4 is a sectional view showing essential parts of a rolling bearing 1 according to a third embodiment. The rolling bearing 1 of this embodiment is different from the first embodiment in the shape of the outer shield plate 24 of the shield 20. The outer shield plate 24 of this embodiment is comprised only of the main body part 25. The outer circumferential surface of the main body portion 25 is fitted into the circumferential surface 11e of the notch portion 11c. Thereby, the outer shield plate 24 is attached to the outer ring 11.

The protruding end 23a of the protruding portion 23 of the inner shield plate 21 is in contact with the axially inner inner surface 25a of the main body portion 25 of the outer shield plate 24. The outer peripheral surfaces of the first adsorbent 27A and the second adsorbent 27B are fitted into the inner peripheral surface of the protrusion 23 of the inner shield plate 21.

The protrusion 23 of the inner shield plate 21 has its protruding end 23 a in contact with the inner surface 25 a of the outer shield plate 24 , so that the inner shield plate 21 and the outer shield plate 24 sandwich the plurality of adsorbents 27 in the axial direction. It is regulated that the interval L2 becomes less than a predetermined value. The interval L2 in this embodiment is the length of the protrusion 23 in the axial direction.

The inner shield plate 21 is sandwiched between the stepped surface 11d of the outer ring 11 and the main body portion 22 of the outer shield plate 24, and its movement in the axial direction is restricted. The outer shield plate 24 is sandwiched between the protrusion 23 of the inner shield plate 21 and the regulating member 30, and movement in the axial direction is regulated.

The other configurations of this embodiment are the same as those of the first embodiment, so the same reference numerals are given and the explanation thereof will be omitted. The rolling bearing 1 of this embodiment also has the same effects as the first embodiment.

[others]
The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above-mentioned meaning, and is intended to include meanings equivalent to the claims and all changes within the scope.

1 Rolling bearing 11 Outer ring 11d Step surface 12 Inner ring 13 Balls (rolling elements)
20 Shield 21 Inner shield plate 22a Inner surface (side surface)
22a1 Inclined surface 23 Projection portion 23a Projection end 24 Outer shield plate 25b Outer surface (side surface)
26 Projection portion 26a Projection end 27 Adsorption material 27A First adsorption material 27B Second adsorption material 30 Regulating member L1 Interval L2 Interval S1 Inside the bearing S2 Outside the bearing

Claims (6)

a fixed ring, a rotating ring, a plurality of rolling elements rollably disposed between the fixed ring and the rotating ring, and the fixed ring for preventing lubricant inside the bearing from flowing out to the outside of the bearing. A pair of annular shields attached to both sides of the ring in the axial direction,
The shield is
an annular inner shield plate having one of the inner circumferential surface and the outer circumferential surface attached to the fixed ring and the other circumferential surface disposed with a gap between the inner circumferential surface and the outer circumferential surface of the rotating ring;
On the axially outer side of the inner shield plate, one of an inner circumferential surface and an outer circumferential surface is attached to the fixed ring, and the other circumferential surface is spaced from the circumferential surface of the rotating ring. an annular outer shield plate arranged;
A rolling bearing comprising: an annular adsorbent sandwiched between the inner shield plate and the outer shield plate and capable of adsorbing the lubricant. The rolling bearing according to claim 1, wherein a portion of the inner shield plate that approaches the rotating ring is formed with an annular inclined surface that slopes axially inward toward the rotating ring. One of the inner shield plate and the outer shield plate protrudes in the axial direction between the circumferential surface of the fixed ring and the circumferential surface of the adsorbent opposite to this circumferential surface, and It has a short cylindrical protrusion that comes into contact with the plate,
The rolling bearing according to claim 1 or 2, wherein the protruding portion restricts a gap between the inner shield plate and the outer shield plate to sandwich the adsorbent from being less than a predetermined value. The inner shield plate has an axially inner side surface thereof in contact with a step surface provided on the fixed ring, so that movement inward in the axial direction is restricted,
4 . The rolling bearing according to claim 3 , wherein the outer shield plate has an axially outer side surface abutted against an annular regulating member attached to the fixed ring, so that axially outward movement of the outer shield plate is regulated. The rolling bearing according to claim 1 or 2, wherein a plurality of the adsorbents are arranged in the axial direction. The plurality of adsorbents include a first adsorbent and a second adsorbent disposed axially inside the first adsorbent,
The rolling bearing according to claim 5, wherein the diameter of the circumferential surface of the second adsorbent on the rotating wheel side is larger than the diameter of the circumferential surface of the first adsorbent on the rotating wheel side.

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