JP2003287041A - Shield plate and rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing furnished with a shield plate wherein a definite sealing effect is provided by the shield plate while preventing spoiling of roundness of an outer ring. <P>SOLUTION: A shield plate engaging groove 6 of the outer ring 2 is composed of a ring inside surface 61, a columnar surface 62 and a conical surface 63. A mounting part of the shield plate 5 is composed of a ring part 531 having a flat surface to be adhered on the ring inside surface 61 and an outer peripheral part 532 bent from its outer edge. The outer peripheral part 532 is composed of three kinds of projections 532a-532c different in projecting length from a bent position divided in the peripheral direction. The longest projection 532a is made into length enough to be engaged with the columnar surface 62, and the middle length projection 532b and the shortest projection 532c are made into lengths enough to be engaged with the conical surface 63. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shield plate for a rolling bearing.

[0002]

2. Description of the Related Art Conventionally, a gap between an inner ring and an outer ring of a rolling bearing is blocked by providing shield plates and seals at both ends in the axial direction, so that dust may intrude into the bearing from the outside or a lubricant in the bearing may be prevented. It is carried out to prevent leakage to the outside. A conventional example of a shield plate for a rolling bearing will be described with reference to FIGS. As shown in these examples, the shield plate locking grooves 6 to which the outer peripheral portion of the shield plate 5 is attached are usually formed at both axial end portions of the outer ring 2 on the inner peripheral side. Further, the shield plate 5 has a disc portion 51 that closes the space between the inner ring 1 and the outer ring 2, and a mounting portion that is integrated with the outer edge portion of the disc portion 51 via a bent portion 52.

A first conventional example will be described with reference to FIGS. 12 and 13. In this example, the shield plate locking groove 6 has an annular inner side surface 61 for axial positioning orthogonal to the axial direction and a large diameter (diameter larger than the inner diameter of the annular inner side surface 61 provided on the axial end side of the annular inner side surface 61). A large diameter) cylindrical surface 60, a conical surface 63 having a diameter that decreases toward the end in the axial direction, and a cylindrical surface 62 at the end in the axial direction.

The attachment portion of the shield plate 5 has an annular portion 531 having a flat surface which is brought into close contact with the annular inner side surface 61 of the shield plate locking groove 6, and an outer peripheral portion 535 bent from the outer edge of the annular portion 531. The outer peripheral portion 535 is provided with slits 535a extending in the radial direction at predetermined intervals, whereby the outer peripheral portion is divided in the circumferential direction, and the tip end of each divided body 535b is rounded.

When attaching the shield plate 5 to the shield plate engaging groove 6 of the outer ring 2, the annular portion 531 of the attaching portion is attached to the annular inner side surface 61 of the shield plate engaging groove 6 in the state of the two-dot chain line in FIG. , The curled portion (rounded portion) of the divided body 535b is pushed in by a jig indicated by the symbol "T" to plastically deform the divided body 535b (by so-called "crimping"). It is pressed against the conical surface 63 of the stop groove 6.

A second conventional example will be described with reference to FIG. In this example, the shield plate locking groove 6 includes an annular inner surface 61 for axial positioning orthogonal to the axial direction, a cylindrical surface 62 at the axially outermost end, and an annular inner surface 61 and a cylindrical surface 62 in the axial direction.
And a conical surface 63 provided at a position between and. The diameter of the conical surface 63 changes within the range between the outer diameter of the annular inner surface 61 and the diameter of the cylindrical surface 63 so as to decrease from the axial center toward the end.

The attachment portion of the shield plate 5 has an annular portion 531 having a flat surface which is brought into close contact with the annular inner side surface 61 of the shield plate locking groove 6, and an outer peripheral portion 536 bent from the outer edge of the annular portion 531. When this shield plate 5 is attached to the shield plate locking groove 6 of the outer ring 2, the outer edge portion of the outer peripheral portion 536 of the attachment portion is plastically deformed (so-called “crimping”).
), It is pressed against the conical surface 63 of the shield plate locking groove 6.

A third conventional example will be described with reference to FIGS. In this example, the shield plate locking groove 6 includes an annular inner surface 61 for axial positioning orthogonal to the axial direction, a cylindrical surface 62 at the axially outermost end, and an annular inner surface 61 and a cylindrical surface 62 in the axial direction. And a conical surface 63 provided at a position between and. The diameter of the conical surface 63 changes within the range between the outer diameter of the annular inner surface 61 and the diameter of the cylindrical surface 62 so as to decrease from the axial center toward the end.

The attachment portion of the shield plate 5 has an annular portion 531 having a flat surface that is brought into close contact with the annular inner surface 61 of the shield plate locking groove 6, and an outer peripheral portion 537 bent from the outer edge of the annular portion 531. The outer peripheral portion 537 is composed of locking claws 537a provided at predetermined intervals in the circumferential direction and the other portion (main portion) 537b. The locking claw 537a has an outer peripheral portion 5
Two notches 537 extending in a radial direction at predetermined positions of 37
It is formed by inserting c and raising the portion between both cuts 537c in an inclined shape radially outward. The length of protrusion of the locking claw 537a from the bending position is determined by the main portion 537b.
Shorter than.

When the shield plate 5 is attached to the shield plate engaging groove 6 of the outer ring 2, the shield plate 5 is pushed in the axial direction with a pushing jig by contacting the end face of the outer ring 2.
The main portion 537b of the outer peripheral portion 537 is pressed against the cylindrical surface 62, and the locking claw 537a is elastically deformed to cause the cylindrical surface 6 to move.
2, and the annular portion 531 is brought into contact with the annular inner side surface 61. When the pressing of the annular portion 531 is terminated after the annular portion 531 is brought into contact with the annular inner surface 61, the tip of the locking claw 537a is pressed against the conical surface 63 by the elastic restoring force.

[0011]

However, in the first and second conventional examples, the outer peripheral portion of the shield plate strongly pushes the conical surface of the engaging groove and the fixing method by caulking is adopted. Therefore, the force with which the outer peripheral portion of the shield plate pushes the outer ring radially outward is likely to be non-uniform in the outer ring circumferential direction. In order to maintain good acoustic and vibration characteristics of the rolling bearing, it is necessary to keep the circularity of the outer ring from being impaired.In order to maintain the circularity of the outer ring, the force is applied in the circumferential direction of the outer ring. It should be uniform.

The third conventional example is designed to prevent the roundness of the outer ring from being impaired, but the pressing claw force of the locking claw of the shield plate against the conical surface of the locking groove. If it becomes insufficient, the force with which the annular portion of the shield plate abuts the annular inner surface of the locking groove decreases, and a sufficient sealing effect may not be obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing provided with a shield plate so as to obtain a reliable sealing effect by the shield plate while preventing the roundness of the outer ring from being impaired.

[0013]

In order to achieve the above object, a shield plate of the present invention is provided with a shield plate locking structure having the following constitution, which is provided at an axially inner end portion of an outer ring of a rolling bearing. A shield plate that is used by mounting it in a groove,
It is characterized by the following and. The shield plate locking groove has an annular inner surface for axial positioning which is orthogonal or substantially orthogonal to the axial direction, a cylindrical surface for radial positioning, and a conical surface.

The cylindrical surface is provided on the inner peripheral side of the outer ring further on the axial end side than the annular inner side surface, and has a diameter larger than the inner diameter of the annular inner side surface. The conical surface is provided at a position between the annular inner surface and the cylindrical surface in the axial direction. The diameter of the conical surface changes within the range of the outer diameter of the annular inner surface and the diameter of the cylindrical surface so as to decrease from the axial center toward the end. An annular portion having a flat surface that is in close contact with the annular inner side surface, and an outer peripheral portion that is bent from the outer edge of the annular portion that engages with the cylindrical surface and the conical surface. The outer peripheral portion is divided in the circumferential direction and is composed of three or more kinds of protrusions having different protrusion lengths from the bending position, and the longest protrusion has a length that engages with the cylindrical surface, and other protrusions. At least one of them is formed to have a length that engages with the conical surface.

The present invention also provides a rolling bearing including the above-mentioned shield plate locking groove and the above-mentioned shield plate, and in the mounted state shown below. The annular portion of the shield plate is in close contact with the annular inner surface of the locking groove, the longest protrusion of the outer peripheral portion of the shield plate is pressed against the cylindrical surface of the locking groove, and the length of the outer peripheral portion of the shield plate is Is attached in a state in which at least one of the projections that is not the longest is pressed against the conical surface of the locking groove.

In the shield plate and the rolling bearing of the present invention, at least two or more kinds of projections having a non-longest length among three or more kinds of projections having different lengths are locked to the conical surface. Is preferred.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. A rolling bearing and a shield plate corresponding to an embodiment of the present invention will be described with reference to FIGS. Figure 1
FIG. 4 is a cross-sectional view showing a part of the rolling bearing of this embodiment. FIG. 2 is a perspective view showing a part of the shield plate of this embodiment. FIG. 3 is a sectional view showing a part of the shield plate of this embodiment. FIG. 4 is a plan view showing a part of the shield plate of this embodiment.

This rolling bearing is composed of an inner ring 1, an outer ring 2, balls (rolling elements) 3, a cage 4, and a shield plate 5. A shield plate locking groove 6 is formed at the axially inner end of the outer ring 2. A portion (small-diameter end portion) 16 of the outer peripheral surface of the inner ring 1 facing the shield plate locking groove 6 is formed to have a smaller diameter than the inner ring outer peripheral surface 12 in the immediate vicinity of the inner ring raceway surface 11. The diameter of this portion 16 is the same as the inner ring outer peripheral surface 1
It may be formed in the same manner as 2.

The shield plate locking groove 6 has an annular inner side surface 61 for axial positioning, which is orthogonal to the axial direction A, a cylindrical surface 62 for radial positioning, and a conical surface 63. Cylindrical surface 6
2 is provided on the innermost side of the outer ring on the most axial end side, and has a diameter larger than the inner diameter of the annular inner side surface 61. The inner peripheral surface 61 a of the annular inner side surface 61 is the same as the outer peripheral surface of the outer ring closest to the outer ring raceway surface 21.

The conical surface 63 is an annular inner surface 61 in the axial direction A.
And the cylindrical surface 62. Conical surface 6
The diameter of 3 changes within the range of the outer diameter R61 of the annular inner surface 61 and the diameter of the cylindrical surface 62 so as to decrease from the axial center A1 toward the end A2. In FIG. 1 which is a cross-sectional view, the cylindrical surface 62 of the shield plate locking groove 6 is shown as a straight line parallel to the axial direction A, and the conical surface 63 is shown as a slanted line inclined with respect to the axial direction A. In addition, the annular inner surface 61 and the conical surface 6
Since the boundary with 3 is rounded, the conical surface 63
The position of the intersection of the straight line L63 indicating the straight line and the straight line L61 indicating the inner ring side surface 61 is regarded as the outer diameter position of the inner ring side surface 61.

The shield plate 5 is a disc-shaped member having a circular through hole 50 into which the small-diameter end portion 16 of the inner ring 1 is inserted, and the disc portion 5 is arranged in order from the center side of the disc surface toward the outer side in the radial direction.
1, a bent portion 52, and a mounting portion 53.
The diameter of the through hole 50 is larger than that of the small diameter end portion 16 of the inner ring 1,
Moreover, it is smaller than the diameter of the inner ring outer peripheral surface 12 in the immediate vicinity of the inner ring raceway surface 11. The shield plate 5 can be manufactured by a conventionally known material and method such as a method of pressing a stainless steel plate such as SUS304.

The mounting portion 53 is integrated with the outer edge portion of the disc portion 51 via the bent portion 52, and is formed with a flat annular portion 531 which is brought into close contact with the annular inner side surface 61 of the shield plate locking groove 6. , And an outer peripheral portion 532 that is bent from the outer edge of the annular portion 531. The annular surface of the annular portion 531 is parallel to the disk surface of the disc portion 51, and the outer peripheral portion 532 is 90 degrees from the outer peripheral end of the annular portion 531 to the side facing the bent portion 52.
It is bent at an angle larger than °.

The outer peripheral portion 532 is divided in the circumferential direction, and three types of protrusions 53 having different protruding lengths from the bent position are provided.
2a to 532c. Longest protrusion 532
The length t1 of a is equal to the distance W1 shown in FIG.
And the boundary point between the cylindrical surface 62 and the conical surface 63 in the axial direction A), and shorter than the distance W2 between the end surface of the outer ring 2 and the annular inner surface 61.

The length t2 of the intermediate length protrusion 532b is
The distance is shorter than the distance W1, and as shown in FIG. 3, when the surface of the annular portion 531 is aligned with the annular inner side surface 61 (extension line L61) of the shield locking groove 6 in the drawing, the tip end portion outside the protrusion 532b. B is dimensioned so as to extend outside the straight line L63 showing the conical surface 63. That is, the protrusion 532b
When is elastically deformed into the shield locking groove 6, a pressing force acts between the tip portion B and the conical surface 63.

The length t3 of the shortest protrusion 532c is shorter than the distance W1, and as shown in FIG.
When the surface of 31 is aligned with the annular inner side surface 61 (extension line L61) of the shield locking groove 6, the tip end C on the outside of the protrusion 532c extends outside the straight extension line L63 showing the conical surface 63. It has become. That is, when the protrusion 532c is elastically deformed and is inserted into the shield locking groove 6, a pressing force acts between the tip portion C and the conical surface 63.

As a result, the longest protrusion 532a is of a length that is engaged with the cylindrical surface 62, and the protrusion 532b having an intermediate length.
The shortest protrusion 532c is formed to have a length that is not engaged with the cylindrical surface 62 but is engaged with the conical surface 63. As shown in FIG. 4, the protrusions 532 a to 532 c that form the outer peripheral portion 532 are arranged in the circumferential direction in the longest protrusion 532.
a, middle length projection 532b, shortest projection 532
c, longest protrusion 532a, middle length protrusion 532
b, the shortest protrusion 532c ...
= 24 (3 types x 8) protrusions 532a at 15 ° intervals
.About.532c are provided. Adjacent protrusions 532a-53
A gap 533 having a predetermined width is provided between 2c.

When the shield plate 5 is attached to the rolling bearing, the annular portion 531 is brought into contact with the end surface of the outer ring 2 and the through hole 50 is inserted into the small-diameter end portion 16 of the inner ring 1, while the annular portion 531 is pressed by the pressing jig. Push in to the axial center A1 side. This pushing is performed until the annular portion 531 abuts the annular inner side surface 61. Thereby, the protrusion 5 of the outer peripheral portion 532.
32a to 532c move to the axial center A1 side while elastically deforming, and the outer peripheral portion 532 and the annular portion 531 are locked in the shield plate locking groove 6.

Here, the longest protrusion 532a is bent by about 90 ° due to elastic deformation, and is pressed against the cylindrical surface 62 by the elastic restoring force for returning to the original angle.
The middle length of the protrusion 532b hits the conical surface 63 at its tip ("B" in FIG. 3) when returning to the original angle. In this state, the tip B of the protrusion 532b and the conical surface 63
A pressing force is generated between and. Due to this pressing force, the protrusion 53
The tip of 2b is pressed against the conical surface 63, and the annular portion 531 is strongly pressed against the annular inner side surface 61 to be in close contact therewith.

The tip of the shortest protrusion 532c ("C" in FIG. 3) abuts the conical surface 63 when trying to return to the original angle. In this state, a pressing force is generated between the tip portion C of the protrusion 532c and the conical surface 63. Due to this pressing force, the tip of the protrusion 532c is pressed against the conical surface 63, and
The ring-shaped portion 531 is strongly pressed against the ring-shaped inner side surface 61 to be in close contact therewith.

According to the rolling bearing of this embodiment, since the longest protrusion 532a of the outer peripheral portion 532 of the shield plate 5 is pressed against the cylindrical surface 62 by the elastic restoring force, the outer peripheral portion 532 of the shield plate 5 moves the outer ring 2 to the outer ring 2. The force pushing outward in the radial direction is likely to be uniform in the circumferential direction of the outer ring 2 as compared with the first conventional example and the second conventional example. Further, since both the intermediate projection 532b and the shortest projection 532c are pressed against the conical surface 63,
The adhesion between the annular portion 531 and the annular inner side surface 61 is higher than in the third conventional example. That is, according to the shield plate 5 of this embodiment, a more reliable sealing effect can be obtained than the shield plate of the third conventional example.

In this embodiment, all the protrusions (both the intermediate length protrusion 532b and the shortest protrusion 532c) other than the longest protrusion 532a of the outer peripheral portion 532 of the shield plate 5 are conical in the locking groove 6. Although it is configured to be locked to the surface 63, the present invention is not limited to this, and the following configurations are also included, for example. The first example will be described with reference to FIGS. The difference between this example and the configuration of the embodiment shown in FIGS. 1 to 3 is only the length t3 of the shortest protrusion 532c. In this example, the length t3 of the shortest protrusion 532c is
Is shorter than the distance W1, and as shown in FIG. 6, the surface of the annular portion 531 is shown in FIG.
The size is such that it does not come into contact with the conical surface 63 even when aligned with the (extension line L61).

Therefore, in this example, the shortest protrusion 532c returns to its original angle after elastically deforming and entering the shield plate locking groove 6, and exists in a state where it does not contact the conical surface 63. Then, only the intermediate-length projection 532b formed to have a length that engages with the conical surface 63 is pressed against the conical surface 63. A second example will be described with reference to FIGS. 7 and 8. The difference between this example and the embodiment shown in FIGS. 1-3 is only the length t2 of the protrusion 532b of intermediate length. In this example, the length t2 of the protrusion 532b having the intermediate length is the distance W1 shown in FIG. 7 (the distance between the annular inner side surface 61 and the boundary point between the cylindrical surface 62 and the conical surface 63 in the axial direction A). Longer than the distance W2 between the end surface of the outer ring 2 and the annular inner side surface 61.

Therefore, in this example, like the longest protrusion 532, the protrusion 532b having an intermediate length is elastically deformed and enters the shield plate locking groove 6, and then is bent approximately 90 ° by elastic deformation. In this state, the elastic restoring force that tries to return to the original angle presses the cylindrical surface 62. Then, only the shortest protrusion 532c formed to have a length that engages with the conical surface 63 is pressed against the conical surface 63.

As in the first example, the outer peripheral portion of the shield plate is composed of three or more kinds of protrusions having different protruding lengths from the bending position, and the longest protrusion is engaged with the cylindrical surface of the locking groove. The protrusions (conical surface engaging protrusions) of a certain length out of the other protrusions (projections other than the longest protrusion) are formed to have a length that engages with the conical surface of the locking groove. The protrusion of another length (conical surface non-engagement protrusion) different from this is formed to be shorter than the length engaging with the columnar portion of the locking groove and not engaging with the conical surface. Even if there is a portion where the conical surface engaging protrusion does not engage with the conical surface of the engaging groove due to variation in the dimension of the engaging groove during processing, the conical surface non-engaging protrusion is in the engaging groove in this part. Can be engaged with and pressed against the conical surface. Therefore, according to the shield plate of the first example, a more reliable sealing effect can be obtained than in the third conventional example.

Further, as in the present invention, the outer peripheral portion of the shield plate is composed of three or more kinds of projections having different projecting lengths from the bending position, and the longest projection is engaged with the cylindrical surface of the engaging groove. And at least one of the other protrusions is formed to have a length that engages with the conical surface of the engaging groove,
Even if there is variation in the size of the locking groove during processing, a protrusion formed with a length that does not engage the cylindrical surface engages with the cylindrical surface, or a protrusion formed with a length that does not engage the conical surface. Can be expected to be engaged with the conical surface. Such a situation cannot be expected in the shield plate of the third conventional example in which the outer peripheral portion of the shield plate is composed of the locking claws and the main part.
According to the shield plate of the present invention, a more reliable sealing effect can be obtained than in the third conventional example.

In the above-described embodiment, the number of types of protrusions having different lengths forming the outer peripheral portion 532 is three, and the total number is 24. However, the type and total number of protrusions are not limited to this. The type of protrusion is, for example, as shown in FIG.
Longest protrusion 532A, second longest protrusion 532B, 2
The shortest protrusion 532C and the shortest protrusion 532D
There may be four types. The number of protrusions is appropriately set depending on the size of the bearing and the like, but is preferably 12 or more.

Further, in this embodiment, the three types of protrusions 532a to 532c that constitute the outer peripheral portion 532 and have different lengths are provided.
Is bent at the same angle greater than 90 ° from the outer peripheral end of the annular portion 531 to the side facing the bent portion 52.
As shown in FIG. 10, it may be bent at different angles.
The shield plate of FIG. 10 is formed so that the bending angle becomes smaller as the protrusion has a longer length.

Further, as shown in FIG. 11, the shield plate 5
When manufacturing by press working, the projections 532a to 532c
The constriction 534 may be provided at the bending position from the annular portion 531 to enhance the springiness of the protrusions 532a to 532c. Further, by applying a fluorine-based oil repellent to the shield plate 5 to form a barrier film, the adhesion between the annular portion 531 of the shield plate 5 and the annular inner side surface 61 of the shield plate engaging groove 6 is enhanced. Good.

[0039]

As described above, according to the shield plate and the rolling bearing of the present invention, it is possible to obtain a reliable sealing effect by the shield plate while preventing the roundness of the outer ring from being impaired. As a result, while ensuring the reliable sealing effect of the shield plate,
It is possible to maintain good vibration characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a rolling bearing corresponding to an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of a shield plate corresponding to an embodiment of the present invention.

FIG. 3 is a sectional view showing a part of a shield plate corresponding to an embodiment of the present invention.

FIG. 4 is a plan view showing a part of a shield plate corresponding to an embodiment of the present invention.

FIG. 5 is a partial sectional view showing a rolling bearing corresponding to another embodiment of the present invention.

FIG. 6 is a sectional view showing a part of a shield plate corresponding to another embodiment of the present invention.

FIG. 7 is a partial sectional view showing a rolling bearing corresponding to another embodiment of the present invention.

FIG. 8 is a sectional view showing a part of a shield plate corresponding to another embodiment of the present invention.

FIG. 9 is a perspective view showing a part of a shield plate corresponding to another embodiment of the present invention.

FIG. 10 is a sectional view showing a part of a shield plate corresponding to another embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a part of a shield plate corresponding to another embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a part of a shield plate corresponding to a first conventional example.

FIG. 13 is a plan view showing a part of a shield plate corresponding to a first conventional example.

FIG. 14 is a cross-sectional view showing a part of a shield plate corresponding to a second conventional example.

FIG. 15 is a sectional view showing a part of a rolling bearing and a shield plate corresponding to a third conventional example.

FIG. 16 is a perspective view showing a part of a shield plate corresponding to a third conventional example.

[Explanation of symbols]

1 inner ring 11 Inner ring raceway 16 Small diameter end 2 outer ring 21 Outer ring raceway 3 balls (rolling elements) 4 cage 5 Shield plate 50 through holes 51 Disk part 52 Bent section 53 Attachment 531 annular part 532 outer circumference 532a protrusion 532b protrusion 532c protrusion 533 Gap between adjacent protrusions 534 Constriction 6 Shield plate locking groove 61 annular inner surface 61a Inner peripheral surface of annular inner surface 62 cylindrical surface 63 conical surface A-axis direction A1 axial center A2 axial end L63 Straight extension line showing conical surface L61 Straight extension line showing the inner ring surface R61 Outside diameter of inner ring surface

Claims (2)

[Claims] 1. An annular inner surface for axial positioning orthogonal to or substantially orthogonal to the axial direction, which is provided at an axial end portion on the inner peripheral side of an outer ring of a rolling bearing, and an axial end portion further than the annular inner surface. And a cylindrical surface for radially positioning, which has a diameter larger than the inner diameter of the annular inner surface, which is provided on the inner peripheral side of the outer ring, and is provided at a position between the annular inner surface and the cylindrical surface in the axial direction. , A conical surface having a diameter changing so as to decrease from the axial center toward the end within the range of the outer diameter of the annular inner surface and the diameter of the cylindrical surface. A shield plate that is used by being attached to a groove, the annular portion having a flat surface that closely adheres to the annular inner surface, and the outer periphery that is bent from the outer edge of the annular portion that engages with the cylindrical surface and the conical surface. The outer peripheral portion is divided in the circumferential direction, and It is composed of three or more kinds of protrusions having different projecting lengths from the position, the longest protrusion is the length engaged with the cylindrical surface, and at least one of the other protrusions is engaged with the conical surface. A shield plate characterized by being formed in a predetermined length. 2. An annular inner surface for axial positioning, which is provided at an axial end portion on the inner peripheral side of the outer ring and is orthogonal or substantially orthogonal to the axial direction, and an outer ring further axially closer to the end portion than the annular inner surface. A cylindrical surface for radially positioning, which is provided on the inner peripheral side and has a diameter larger than the inner diameter of the annular inner surface, and the annular surface, which is provided at a position between the annular inner surface and the cylindrical surface in the axial direction. A shield plate locking groove having a conical surface whose diameter changes so as to become smaller from the axial center toward the end within the range of the outer diameter of the inner surface and the diameter of the cylindrical surface, An annular portion having a flat surface to be brought into close contact with the annular inner side surface,
An outer peripheral portion that is bent from the outer edge of the annular portion that engages with the cylindrical surface and the conical surface, and the outer peripheral portion is divided in the circumferential direction and has a different protruding length from the bending position. It is composed of three or more kinds of protrusions, and the longest protrusion is formed to have a length that engages with the cylindrical surface, and at least one of the other protrusions has a length that engages with the conical surface. The shield plate, the annular portion of the shield plate is in close contact with the annular inner surface of the locking groove, the longest protrusion of the outer peripheral portion of the shield plate is pressed against the cylindrical surface of the locking groove, A rolling bearing, wherein at least one of the protrusions whose outer peripheral portion is not the longest is attached in a state of being pressed against the conical surface of the locking groove.