JP2022148212A - rolling bearing - Google Patents

Abstract

To further improve sealing performance in order to suppress the intrusion of foreign matters into a rolling bearing.SOLUTION: A rolling bearing 1 comprises a slinger 5 fixed to an end part 22 of an inner ring 2, and a seal member 6 fixed to an end part 32 of an outer ring 3. The seal member 6 is constituted of a core grid 61 and a coating part 62. Since a second circular ring part 53 of the slinger 5 is located inside a first circular ring part 52 in an axial direction, a deformation of the second circular ring part 53 at the pressure-insertion of a first cylinder part of the slinger 5 into a small-diameter part 24 of the inner ring 2 is suppressed, and a second lip 67 of the seal member 6 surely and stably contacts with an inner face 53b of the second circular ring part 53 of the slinger 5. Since an external peripheral face 54a of a second cylinder part 54 of the slinger 5 is located outside an external peripheral face 64b of a third cylinder part 64 of the core grid 61 in a radial direction, a labyrinth is formed of a first clearance 91, a second clearance 92 and a third clearance 93.SELECTED DRAWING: Figure 2

Description

The present invention relates to rolling bearings.

2. Description of the Related Art In automobiles, endless belts such as timing belts and accessory drive belts are used. The endless belt is stretched over pulleys and driven by, for example, an automobile engine. A pulley over which the endless belt is stretched (for example, an idler pulley for adjusting the position of the endless belt) is rotatably supported with respect to a stationary member (for example, a support shaft) by a rolling bearing.

In such a rolling bearing, foreign matter such as rain water, muddy water, and dust may enter the inside of the rolling bearing when the automobile is running. Therefore, conventional rolling bearings sometimes have a sealing structure that prevents foreign matter such as rainwater, muddy water, dust, etc. from entering the inside of the rolling bearing.

As a rolling bearing having a sealed structure, Patent Document 1 discloses an inner ring, an outer ring, a plurality of rolling elements arranged between the inner ring and the outer ring, a slinger fixed to the inner ring, and a seal fixed to the outer ring. A rolling bearing is described, comprising a member, the sealing member having a first lip in contact with the inner ring and a second lip in contact with the slinger.

Japanese Patent No. 6402489

In a rolling bearing having a sealing structure as described above, it is possible to sufficiently prevent foreign matter such as rainwater, muddy water and dust from entering the inside of the rolling bearing. being tried.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing capable of further improving sealing performance in order to prevent foreign matter such as rainwater, muddy water and dust from entering the inside of the rolling bearing.

A rolling bearing according to the present invention comprises an inner ring having an inner ring raceway surface on its outer peripheral surface, an outer ring having an outer ring raceway surface on its inner peripheral surface, and a plurality of rolling bearings disposed between the inner ring raceway surface and the outer ring raceway surface. a slinger fixed to the outer peripheral surface outside the inner ring raceway surface in the axial direction; and a seal member fixed to the inner peripheral surface axially outside the outer ring raceway surface. The slinger includes a first cylindrical portion fixed to the outer peripheral surface, a first annular portion extending radially outward from an axially outer end of the first cylindrical portion, and an outer portion of the first annular portion. a flat plate-shaped second annular portion extending outward in the radial direction from the peripheral edge; and a second cylindrical portion extending axially inward from the outer peripheral edge of the second annular portion. The annular portion is positioned axially inside the first annular portion, and the first cylindrical portion, the first annular portion, the second annular portion, and the second cylindrical portion are integrally formed by a plate member. It is formed. The sealing member includes a third annular portion fixed to the inner peripheral surface, a third cylindrical portion extending outward in the axial direction from the inner peripheral edge of the third annular portion, and a third cylindrical portion axially outward. A fourth annular portion extending radially inward from the end of the ring portion, an annular first lip provided on the inner peripheral edge of the fourth annular portion, and the outer surface of the fourth annular portion in the axial direction and an annular second lip provided in the third annular portion, the third cylindrical portion, and the fourth annular portion are integrally formed by a plate-like member, and the fourth annular portion is , located inside the second annular portion in the axial direction. The first lip contacts the inner ring, and the second lip contacts the surface of the second annular portion on the inner side in the axial direction. The outer peripheral surface of the second cylindrical portion is located radially outside the outer peripheral surface of the third cylindrical portion.

In the rolling bearing according to the present invention, the slinger has a first cylindrical portion, a first annular portion, a second annular portion and a second cylindrical portion, wherein the second annular portion is the first annular portion It is integrally formed by a plate-like member while being positioned inside in the axial direction of the portion. This suppresses deformation (for example, deformation in which the peripheral edge of the slinger opens outward in the axial direction) when, for example, the first cylindrical portion is press-fitted into the inner ring to fix the slinger to the outer peripheral surface of the inner ring. As a result, deformation of the flat plate-shaped second annular portion is also suppressed, so that the direction in which the second annular portion extends is maintained in the radial direction, and the surface of the inner second annular portion in the axial direction is flat. kept in Therefore, the second lip is in reliable and stable contact with the surface of the second annular portion on the inner side in the axial direction. Moreover, in the rolling bearing according to the present invention, the outer peripheral surface of the second cylindrical portion is located radially outside the outer peripheral surface of the third cylindrical portion. Thereby, the space between the inner peripheral surface of the outer ring and the second cylindrical portion, the space between the inner peripheral surface of the outer ring and the third cylindrical portion, and the space between the second cylindrical portion and the third cylindrical portion A labyrinth is formed by As described above, it is possible to further improve the sealing performance in order to prevent foreign matter such as rainwater, muddy water and dust from entering the rolling bearing.

In the rolling bearing according to the present invention, there is a first gap between the inner peripheral surface facing the third cylindrical portion in the radial direction and the third cylindrical portion. A second gap may be provided between the second cylindrical portion and a surface diametrically opposed to the portion, and the width of the first gap in the radial direction may be larger than the width of the second gap in the radial direction. .

In this case, foreign matter such as rainwater, muddy water, dust, etc. tends to accumulate in the first gap between the inner peripheral surface of the outer ring and the third cylindrical portion. Then, for example, when the inner ring is fixed and the outer ring is rotated, centrifugal force acts on the foreign matter accumulated in the first gap between the inner peripheral surface of the outer ring and the third cylindrical portion, causing the foreign matter to move out of the second gap. is discharged to the outside. Therefore, it is possible to further prevent foreign matter such as rain water, muddy water, and dust from entering the rolling bearing.

In the rolling bearing according to the present invention, the surface of the inner peripheral surface that faces the second cylindrical portion in the radial direction may be a tapered surface that widens outward in the axial direction.

In this case, when the inner ring is fixed and the outer ring is rotated, centrifugal force acts on the foreign matter. When the foreign matter reaches the surface of the inner peripheral surface of the outer ring that faces the second cylindrical portion in the radial direction, the surface is a tapered surface that widens outward in the axial direction. An outward force in the direction is generated, and this force acts on the foreign object. As a result, the foreign matter is easily expelled to the outside. Therefore, it is possible to further prevent foreign matter such as rain water, muddy water, and dust from entering the rolling bearing.

In the rolling bearing according to the present invention, the seal member further has an annular projection provided on the surface of the fourth annular portion on the outer side in the axial direction, and the projection comprises the second lip and the second annular portion. may be positioned radially outward from the position where the surface of the

In this case, since the third gap between the second cylindrical portion and the third cylindrical portion is narrowed, foreign matter accumulated in the first gap is prevented from entering the rolling bearing through the third gap. can be suppressed.

According to the rolling bearing according to the present invention, it is possible to further improve the sealing performance in order to prevent foreign matter such as rainwater, muddy water and dust from entering the inside of the rolling bearing.

1 is a cross-sectional view of a rolling bearing according to one embodiment; FIG. 2 is a cross-sectional view of part of the rolling bearing shown in FIG. 1; FIG. FIG. 5 is a cross-sectional view of part of a rolling bearing according to another embodiment;

An embodiment of a rolling bearing according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments described below. The technical scope of the present invention is defined based on the description of the claims. In the description of the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

As shown in FIG. 1, the rolling bearing 1 rotatably supports an idler pulley 100 of an automobile. A rolling bearing 1 is a ball bearing including an inner ring 2 , an outer ring 3 , a plurality of rolling elements 4 , a pair of slingers 5 and a pair of seal members 6 . The rolling bearing 1 rotatably supports an idler pulley 100, which is a rotating member, with respect to a support shaft, which is a stationary member (not shown).

In FIG. 1, the arrow L1 represents the axial direction (the direction in which the support shaft extends), and the arrow L2 represents the radial direction (the direction in which the radius of the idler pulley 100 extends). A dashed-dotted line is a plane perpendicular to the axial direction and represents a plane that bisects the dimension of the rolling bearing 1 in the axial direction (thickness of the rolling bearing 1). In the following, this plane will be used as a reference plane, and the side closer to the reference plane along the axial direction will be referred to as "inner" in the axial direction, and the side farther from the reference plane along the axial direction will be referred to as "outer" in the axial direction. and express. In addition, the side closer to the support shaft along the radial direction is expressed as "inside" in the radial direction, and the side farther from the support shaft along the radial direction is expressed as "outer" in the radial direction.

The inner ring 2 is a stationary ring. The inner ring 2 is fixed to the support shaft by fitting its inner peripheral surface to the outer peripheral surface of the support shaft. An inner ring raceway surface 21 is provided on the outer peripheral surface of the inner ring 2 . The inner ring raceway surface 21 is a groove extending in the circumferential direction of the outer peripheral surface of the inner ring 2 . In the illustrated example, two inner ring raceway surfaces 21 are provided, but the number of inner ring raceway surfaces 21 is not limited to two. One or three or more inner ring raceway surfaces 21 may be provided.

The outer ring 3 is a rotating ring. The outer ring 3 is fixed to the idler pulley 100 by fitting its outer peripheral surface to the inner peripheral surface of the idler pulley 100 which is a rotating member. An outer ring raceway surface 31 is provided on the inner peripheral surface of the outer ring 3 . The outer ring raceway surface 31 is a groove extending in the circumferential direction of the inner peripheral surface of the outer ring 3 and is provided in the same number as the inner ring raceway surface 21 .

A plurality of rolling elements 4 are rotatably arranged between the inner ring raceway surface 21 and the outer ring raceway surface 31 . A plurality of rolling elements 4 are held by a retainer 7 arranged between the inner ring 2 and the outer ring 3 and arranged between the inner ring raceway surface 21 and the outer ring raceway surface 31 so as to be free to roll.

Each slinger 5 is fixed to the outer peripheral surface of the inner ring 2 outside the inner ring raceway surface 21 in the axial direction. Specifically, each slinger 5 is fixed to the respective outer peripheral surfaces 24a (see FIG. 2) of one end 22 and the other end 22 of the inner ring 2 in the axial direction, as shown in FIG. . Each seal member 6 is fixed to the inner peripheral surface of the outer ring 3 outside the outer ring raceway surface 31 in the axial direction. Specifically, as shown in FIG. 1, the seal member 6 is fixed to the inner peripheral surfaces 34a (see FIG. 2) of the one end 32 and the other end 32 of the outer ring 3 in the axial direction. be. The slinger 5 and the seal member 6 form a sealing structure that prevents foreign matter such as rain water, muddy water, and dust from entering the space 8 inside the rolling bearing.

The pair of slingers 5 are the same, and the pair of seal members 6 are the same, except that they are fixed at different positions. Therefore, in the following, the slinger 5 fixed to one end 22 of the inner ring 2 in the axial direction and the sealing member 6 fixed to one end 32 of the outer ring 3 in the axial direction will be described, and the other end 22 A description of the slinger 5 fixed to the slinger 5 and the seal member 6 fixed to the other end 32 is omitted.

As shown in FIG. 2 , a small diameter portion 24 is provided at one end 22 of the inner ring 2 in the axial direction, where the outer diameter of the inner ring 2 is reduced. An end surface 26 facing outward in the axial direction is formed at the end of the portion (large diameter portion 25 ) of the inner ring 2 other than the small diameter portion 24 .

One end portion 32 of the outer ring 3 in the axial direction is provided with an enlarged diameter portion 34 in which the inner diameter of the outer ring 3 is enlarged. An end surface 36 facing outward in the axial direction is formed at the end of the portion (reduced diameter portion 35 ) of the outer ring 3 other than the enlarged diameter portion 34 .

The slinger 5 has a first cylindrical portion 51 , a first annular portion 52 , a second annular portion 53 and a second cylindrical portion 54 . The first cylindrical portion 51, the first annular portion 52, the second annular portion 53, and the second cylindrical portion 54 are integrally formed of a plate member. As an example, the first cylindrical portion 51, the first annular portion 52, the second annular portion 53, and the second cylindrical portion 54 are integrally formed by pressing a metal plate member. The slinger 5 is fixed to the inner ring 2 by fitting and fixing the first cylindrical portion 51 to the outer peripheral surface 24 a of the small diameter portion 24 of the inner ring 2 . The first annular portion 52 extends radially outward from an axially outer end portion 51 a of the two ends of the first cylindrical portion 51 . The second annular portion 53 extends radially outward from the outer peripheral edge 52a of the first annular portion 52 . The second cylindrical portion 54 extends axially inward from the outer peripheral edge 53 a of the second annular portion 53 .

The second annular portion 53 is located inside the first annular portion 52 in the axial direction. Between the first annular portion 52 and the second annular portion 53, in the illustrated example, there is an inclined annular ring that is inclined so as to continuously transition toward the inner side in the axial direction as it goes outward in the radial direction. Although the portion 55 is formed, an annular stepped portion may be formed. The second annular portion 53 is flat and has an inner surface 53b that is an inner surface in the axial direction and an outer surface 53c that is an outer surface in the axial direction.

The seal member 6 is composed of a metal core 61 and a covering portion 62 integrally formed to partially cover the metal core 61 . The cored bar 61 has a third annular portion 63 , a third cylindrical portion 64 and a fourth annular portion 65 . The third annular portion 63, the third cylindrical portion 64, and the fourth annular portion 65 are integrally formed of a plate member. As an example, the third annular portion 63, the third cylindrical portion 64, and the fourth annular portion 65 are integrally formed by pressing a metal plate member. The covering portion 62 is made of an elastic member such as an elastomer, and is integrated with the metal core 61 by insert molding, for example.

The sealing member 6 is fixed to the outer ring 3 by fixing the third annular portion 63 of the cored bar 61 to the enlarged diameter portion 34 of the outer ring 3 . In the illustrated example, since the third annular portion 63 is covered with the covering portion 62, the covering portion 62 covering the third annular portion is fitted to the inner peripheral surface 34a of the enlarged diameter portion 34. It is fixed to the enlarged diameter portion 34 by being fixed. The third cylindrical portion 64 extends axially outward from an inner peripheral edge 63 a of the third annular portion 63 . The fourth annular portion 65 extends radially inward from an axially outer end portion 64 a of the two ends of the third cylindrical portion 64 . Here, the fourth annular portion 65 is located inside the second annular portion 53 of the slinger 5 in the axial direction.

An annular first lip 66 is provided on the inner peripheral edge 65 a of the fourth annular portion 65 . A tip portion of the first lip 66 protrudes axially inward and contacts the end surface 26 of the large diameter portion 25 of the inner ring 2 .

Of the two surfaces of the fourth annular portion 65, an outer surface 65b, which is the outer surface in the axial direction, is provided with an annular second lip 67. As shown in FIG. The second lip 67 extends outward in the axial direction and outward in the radial direction from the outer surface 65 b of the fourth annular portion 65 . The tip of the second lip 67 protrudes outward in the axial direction and contacts the inner surface 53 b of the second annular portion 53 of the slinger 5 .

An annular third lip 68 is provided on the fourth annular portion 65 . The third lip 68 is provided radially outside the first lip 66 . The tip of the third lip 68 protrudes inward in the axial direction and forms a labyrinth with the inner ring 2 .

The first lip 66 , the second lip 67 and the third lip 68 are all formed by the elastic member that forms the covering portion 62 .

The outer peripheral surface 54 a of the second cylindrical portion 54 of the slinger 5 is located radially outside the outer peripheral surface 64 b of the third cylindrical portion 64 of the cored bar 61 .

The outer peripheral surface 54a of the second cylindrical portion 54 of the slinger 5, the outer peripheral surface 64b of the third cylindrical portion 64 of the core bar 61, and the inner peripheral surface 34a of the enlarged diameter portion 34 of the outer ring 3 face each other in the radial direction. A first gap 91 is provided between the inner peripheral surface 34 a and the outer peripheral surface 64 b of the third cylindrical portion 64 and the surface of the inner peripheral surface 34 a that faces the outer peripheral surface 64 b of the third cylindrical portion 64 in the radial direction. A second gap 92 is formed between the surface of the inner peripheral surface 34a that faces the outer peripheral surface 54a of the second cylindrical portion 54 in the radial direction and the outer peripheral surface 54a of the second cylindrical portion 54 . A width W1 of the first gap 91 in the radial direction is larger than a width W2 of the second gap 92 in the radial direction. Furthermore, there is a third gap 93 between the second cylindrical portion 54 and the third cylindrical portion 64 .

A portion of the inner peripheral surface 34a of the enlarged diameter portion 34 of the outer ring 3 that faces the outer peripheral surface 54a of the second cylindrical portion 54 of the slinger 5 in the radial direction is a tapered surface 34b that widens outward in the axial direction. .

As described above, in the rolling bearing 1 , the slinger 5 has the first cylindrical portion 51 , the first annular portion 52 , the second annular portion 53 , and the second cylindrical portion 54 . The first cylindrical portion 51 , the first annular portion 52 , the second annular portion 53 , and the second cylindrical portion 54 are configured so that the second annular portion 53 is axially inward of the first annular portion 52 . It is integrally formed by the plate member in the positioned state. Thereby, as described below, deformation of the slinger 5 when the slinger 5 is fixed to the inner ring 2 can be suppressed, and the distal end portion of the second lip 67 can be securely attached to the inner surface 53 b of the second annular portion 53 . and stable contact.

The slinger 5 is fixed to the inner ring 2 by fitting and fixing the first cylindrical portion 51 to the outer peripheral surface 24 a of the small diameter portion 24 of the inner ring 2 . The fitting of the first cylindrical portion 51 to the outer peripheral surface 24 a is performed by, for example, press-fitting the first cylindrical portion 51 into the small diameter portion 24 . At the time of press-fitting, the slinger 5 receives a force that pushes the first cylindrical portion 51 open, that is, a force that moves the second cylindrical portion 54 axially outward. opening deformation may occur. However, in the rolling bearing 1, since the slinger 5 has the structure described above, even if such a force acts, the outward movement of the second cylindrical portion 54 in the axial direction is suppressed. Deformation in which the peripheral portion opens outward in the axial direction is suppressed. As a result, deformation of the flat second annular portion 53 is also suppressed, so that the extending direction of the second annular portion 53 is maintained in the radial direction, and the inner surface 53b of the second annular portion 53 is flattened. be kept. Therefore, the tip of the second lip 67 comes into contact with the inner surface 53b of the second annular portion 53 reliably and stably.

In addition, in the rolling bearing 1, since a labyrinth is formed by the first gap 91, the second gap 92, and the third gap 93, for example, foreign matter such as rainwater, muddy water, and dust is less likely to enter from the outside.

Further, in the rolling bearing 1, the width W1 of the first gap 91 in the radial direction is larger than the width W2 of the second gap 92 in the radial direction. Therefore, for example, foreign matter such as rainwater, muddy water, dust, etc., tends to accumulate in the first gap 91 even after passing through the second gap 92 . Then, when the outer ring 3 is rotated, centrifugal force acts on the foreign matter accumulated in the first gap 91, and the foreign matter is discharged to the outside.

Further, in the rolling bearing 1, the portion of the inner peripheral surface 34a of the enlarged diameter portion 34 of the outer ring 3 that faces the outer peripheral surface 54a of the second cylindrical portion 54 of the slinger 5 in the radial direction extends outward in the axial direction. A widening tapered surface 34b is formed. This makes it easier for the foreign matter to be ejected to the outside, as described below.

When the outer ring 3 is rotated, centrifugal force acts on foreign matter such as rainwater, muddy water, and dust particles that have entered the first gap 91 . When the foreign matter moves into the second gap 92 and reaches the tapered surface 34b by the action of the centrifugal force, a force directed outward in the axial direction is generated as a component force of the centrifugal force, and this force acts on the foreign matter. is easily exhaled to the outside.

As described above, the rolling bearing 1 can prevent foreign matter such as rainwater, muddy water, and dust from entering the inside of the rolling bearing 1 .

The rolling bearing according to the present invention is not limited to the rolling bearing 1 described above, and various modifications are possible. An example of such a modification is described below as another embodiment. The rolling bearing 1A shown in FIG. 3 differs from the rolling bearing 1 described above in the slinger 5 and the seal member 6.

Specifically, the slinger 5 of the rolling bearing 1A differs from the slinger 5 of the rolling bearing 1 described above in that its radial dimension is reduced. That is, in the rolling bearing 1A, since the radial dimension of the second annular portion 53 of the slinger 5 is small, the radial dimension of the slinger 5 is also small. In the rolling bearing 1A, since the radial dimension of the slinger 5 is small, a large width W2 of the second gap 92 in the radial direction is ensured. In addition, in the rolling bearing 1A, since the slinger 5 has a small radial dimension, the third gap 93 is narrowed.

Further, the sealing member 6 of the rolling bearing 1A is different from the sealing member 6 of the rolling bearing 1 described above in that an annular projecting portion 69 is provided. In the rolling bearing 1</b>A, an annular projection 69 is provided on the outer surface 65 b of the fourth annular portion 65 of the seal member 6 . The projecting portion 69 is provided radially outside the second lip 67 . The projecting portion 69 is provided radially outside the position where the tip portion of the second lip 67 and the inner surface 53b of the second annular portion 53 of the slinger 5 contact each other.

In the rolling bearing 1A, since the width W2 of the second gap 92 in the radial direction is ensured to be large, foreign matter such as rainwater, muddy water, and dust is likely to be discharged to the outside, as described below.

That is, also in the rolling bearing 1A, the width W1 of the first gap 91 in the radial direction is larger than the width W2 of the second gap 92 in the radial direction. Therefore, for example, foreign matter such as rainwater, muddy water, dust, etc., tends to accumulate in the first gap 91 even after passing through the second gap 92 . Then, when the outer ring 3 is rotated, centrifugal force acts on the foreign matter accumulated in the first gap 91, and the foreign matter is discharged to the outside. At this time, since the width W2 of the second gap 92 in the radial direction is ensured to be large, foreign matter is likely to be discharged to the outside.

In addition, in the rolling bearing 1A, the third gap 93 is narrowed, so that foreign matter accumulated in the first gap 91 is prevented from passing through the third gap 93 and entering the rolling bearing 1A. can be done.

Further, in the rolling bearing 1A, since the seal member 6 is provided with the annular projecting portion 69, the third gap 93 is narrowed. As a result, it is possible to prevent the foreign matter accumulated in the first gap 91 from passing through the third gap 93 and entering the rolling bearing 1A.

In the rolling bearing 1 and the rolling bearing 1A described above, the inner ring 2 is a fixed ring and the outer ring 3 is a rotating ring, but the inner ring 2 may be a rotating ring and the outer ring 3 may be a stationary ring. In this case, the inner ring 2 is fixed to the idler pulley 100 by fitting the inner peripheral surface thereof to the outer peripheral surface of a rotating shaft passing through the center of the idler pulley 100, which is a rotating member, and the outer ring 3 is attached to the idler pulley 100. It is fixed to the stationary member by, for example, fitting the outer peripheral surface to the inner peripheral surface of a through hole provided in the stationary member.

Reference Signs List 1, 1A Rolling bearing 2 Inner ring 21 Inner ring raceway surface 24a Outer circumference surface 3 Outer ring 31 Outer ring raceway surface 34a Inner circumference surface 34b Tapered surface 4 Rolling elements 5 Slinger 51 First cylindrical portion 52 First annular portion 53 Second annular portion 53b Inner surface 54 Second cylindrical portion 6 Sealing member 63 Third annular portion 64 Third cylindrical portion 65 Fourth annular portion 65b Outer surface 66 First lip 67 Second lip 7 Cage 91 First clearance 92 Second clearance.

Claims (4)

an inner ring having an inner ring raceway surface on its outer peripheral surface;
an outer ring having an outer ring raceway surface on its inner peripheral surface;
a plurality of rolling elements rollably arranged between the inner ring raceway surface and the outer ring raceway surface;
a slinger fixed to the outer peripheral surface outside the inner ring raceway surface in the axial direction;
a seal member fixed to the inner peripheral surface outside the outer ring raceway surface in the axial direction,
The slinger is
a first cylindrical portion fixed to the outer peripheral surface;
a first annular portion extending radially outward from an axially outer end of the first cylindrical portion;
a flat plate-shaped second annular portion extending radially outward from the outer peripheral edge of the first annular portion;
a second cylindrical portion extending inward in the axial direction from the outer peripheral edge of the second annular portion;
The second annular portion is located axially inner than the first annular portion,
The first cylindrical portion, the first annular portion, the second annular portion, and the second cylindrical portion are integrally formed by a plate member,
The sealing member is
a third annular portion fixed to the inner peripheral surface;
a third cylindrical portion extending outward in the axial direction from the inner peripheral edge of the third annular portion;
a fourth annular portion extending radially inward from an axially outer end of the third cylindrical portion;
an annular first lip provided on the inner peripheral edge of the fourth annular portion;
an annular second lip provided on the outer surface of the fourth annular portion in the axial direction;
The third annular portion, the third cylindrical portion, and the fourth annular portion are integrally formed by a plate member,
The fourth annular portion is located axially inner than the second annular portion,
the first lip contacts the inner ring,
the second lip contacts the surface of the second annular portion on the inner side in the axial direction;
The outer peripheral surface of the second cylindrical portion is located radially outside the outer peripheral surface of the third cylindrical portion,
rolling bearing. There is a first gap between the inner peripheral surface facing the third cylindrical portion in the radial direction and the third cylindrical portion,
There is a second gap between the inner peripheral surface facing the second cylindrical portion in the radial direction and the second cylindrical portion,
the width of the first gap in the radial direction is greater than the width of the second gap in the radial direction;
A rolling bearing according to claim 1. A surface of the inner peripheral surface that faces the second cylindrical portion in the radial direction is a tapered surface that widens outward in the axial direction.
A rolling bearing according to claim 1 or 2. The seal member further has an annular projection provided on the surface of the fourth annular portion outside in the axial direction,
The protruding portion is positioned radially outward from a position where the second lip and the surface of the second annular portion are in contact,
A rolling bearing according to any one of claims 1 to 3.

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