JPH11230179A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the waterproof property and the dust-proof property without requiring a large space by fitting an annular shield plate to cover a seal outside in the axial direction of the seal and with intervals. SOLUTION: A rolling bearing 1 comprises an inner ring 2 fitted to a shaft 7, an outer ring 3 fitted to a housing 8, a ball 4 provided between the inner and outer rings, and a seal 5 fitted between the inner and outer rings. A flat metallic shield plate 6 is held and fitted between a flat surface of the inner ring 2 and a stop ring 9 outside in the axial direction of the seal 5. Thus, the seal itself is not directly collided with water or foreign matters, and because the shield plate 6 is opposite to the seal 5 with intervals therebetween, a labyrinth is formed between the seal 5 and the shield plate 6. Thus, even if water or foreign matters enter between the seal 5 and the shield plate 6, they are scattered by the centrifugal force. No large space is increased because the rolling bearing itself and its peripheral structure are not improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing which is effective for bearings for automobile accessories which are required to be waterproof and dustproof, such as bearings for electromagnetic clutches and bearings for intermediate pulleys.

[0002]

2. Description of the Related Art Conventionally, rolling bearings have been frequently used in automotive accessories and the like. FIG. 11 shows a simplified cross-sectional view of a conventional rolling bearing. The rolling bearing 90 shown in FIG. 11 includes an inner ring 92 mounted on a shaft 97, an outer ring 93 mounted on a housing 98, a ball 94 provided between the inner and outer rings, and an inner and outer ring And a seal 95 mounted over the seal 95.

The seal 95 has a rubber seal portion 95.
a and a metal core 95b. The seal 95 is provided with a seal groove 93 provided on the inner surface of the outer ring 93.
a, one side is mounted, and the other side is in contact with a seal groove 92a provided on the outer diameter surface of the inner ring 92, thereby forming a seal lip structure. Here, the seal 95 is mounted in the width direction of the bearing 90.

[0004]

However, at present, bearings requiring high sealing performance are provided with a double or triple seal structure and a greatly improved shaft or housing structure. is there. These improvements require additional processing and the like, which increases the cost and requires a large space. Also, axes that have already been mass-produced,
Upgrading of the housing was not possible. In addition, the seal attached to the bearing is generally a thin plate made of rubber and metal, and may be deformed by water or foreign matter that hits the bearing violently, so that the sealing performance is limited. Therefore,
An object of the present invention is to provide a rolling bearing that can mitigate the direct attack of water and foreign matters on the seal without improving the structure around the rolling bearing, increase the space, and improve the waterproof and dustproof properties. It is in.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing in which a seal is provided between an inner ring and an outer ring, wherein a gap is provided in the seal at an axially outer side of the seal and at least one of the inner and outer rings. The problem is solved by a rolling bearing characterized in that an annular shield plate which covers the seal opposingly is mounted.

According to the present invention, since the shield plate covering the seal is mounted on at least one of the inner and outer races, the seal itself does not directly collide with water, foreign matter, or the like. Since the shield plate faces the seal with a gap, a labyrinth is formed between the seal and the shield plate. Therefore, waterproofness and dustproofness can be improved. Furthermore,
Since the seal rotates together with the inner ring or the outer ring, even if water or foreign matter enters between the seal and the shield plate, the water or foreign matter is blown out of the bearing by the centrifugal force of the seal itself. In addition, since the structure around the rolling bearing is not improved, the cost is low.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. First, a rolling bearing 1 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a simplified sectional view of a rolling bearing 1 according to a first embodiment of the present invention. As shown in FIG. 1, the rolling bearing 1 plays a role of waterproof and dustproof with an inner ring 2 mounted on a shaft 7, an outer ring 3 mounted on a housing 8, and a ball 4 provided between the inner and outer rings. And a seal 5 mounted between the inner and outer rings.

The seal 5 has a rubber seal portion 5a.
And a metal core 5b. And
The seal 5 has one side attached to a seal groove 3a provided on the inner diameter surface of the outer ring 3 and the other side comes into contact with the seal groove 2a provided on the outer diameter surface of the inner ring 2 to form a seal lip structure. No. Here, the seal 5 is mounted in the width direction of the bearing 1. In addition, the seal 5
A shield plate 6 made of a slinger type flat metal plate is sandwiched and mounted between the flat surface of the inner ring 2 and the retaining ring 9 on the outside in the axial direction. The shield plate 6 has an annular shape and faces the seal 5 with a gap therebetween, and covers the seal 5.

Next, the operation of the rolling bearing 1 according to the first embodiment will be described. The rolling bearing 1 includes:
Since the shield plate 6 covering the seal 5 is mounted,
The seal itself does not directly collide with water or foreign matter. Since the shield plate 6 faces the seal 5 with a gap, a labyrinth is formed between the seal 5 and the shield plate 6. Therefore, waterproofness and dustproofness can be improved. Further, since the seal 5 rotates together with the outer ring 3,
Even if water or foreign matter enters between the seal 5 and the shield plate 6, the water and foreign matter are blown out of the bearing by the centrifugal force of the seal 5. In addition, since the structure of the rolling bearing itself and its surroundings are not improved, the cost is low and there is no large space increase.

Next, a rolling bearing according to a second embodiment of the present invention will be described. FIG. 2 shows a simplified sectional view of a rolling bearing 10 according to a second embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 2, a shield plate 16 that is bent in a slinger type is provided on the rolling bearing 10 outside the seal 15 in the axial direction. The shield plate 16 has an annular shape,
The seal 15 is opposed to the seal 15 with a gap, and covers the seal 15. The tip of the shield plate 16 has substantially the same curvature as the chamfer 12b of the inner ring 12.
Then, in the chamfered portion 12b, the shield plate 1
6 is adhered to the inner ring 12. The shield plate 1
6 is different from that of the first embodiment, but in the case of the second embodiment, the same operation and effect as those of the first embodiment can be achieved.

Note that the shield plate 16 is shown in FIG.
It is preferable to have the shapes shown in (a) and (b). FIG.
FIG. 3A is a top view of the shield plate, and FIG.
It is sectional drawing cut | disconnected by SS line of (a). FIG. 3 (a)
As shown in FIG. 7, the shield plate 16 includes eight projecting portions 16a projecting inward, and an adhesive portion 16b adhered to the inner ring. The projection 16a has a notch 16
c is provided. The protruding portion 16a allows the shield plate 16 to be pressed into the shaft 17, so that the shield plate 16 is securely mounted. The notch 16
By providing c, the protruding portion 16a is easily bent,
The attachment to the shaft 17 is further ensured. Note that the number of projecting portions may be two or more.

Next, a rolling bearing according to a third embodiment of the present invention will be described. FIG. 4 shows a simplified cross-sectional view of a rolling bearing 20 according to a third embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 4, on the outside of the seal 25 of the rolling bearing 20 in the axial direction,
A slinger type shield plate 26 bent at a substantially right angle is provided. The shield plate 26 has an annular shape and faces the seal 25 with a gap therebetween.
5 is covered. One end of the shield plate 26 is sandwiched between the inner diameter of the inner ring 22 and the shaft 27. Here, a step portion 22a having substantially the same size as the thickness of the shield plate 16 is provided on the inner diameter of the inner ring 22, and one end of the shield plate 26 is disposed at a position corresponding to the step portion 22a. The mounting type of the shield plate 26 is the first type.
Although different from the embodiment, in the case of the third embodiment, the same operation and effect as those of the above-described first embodiment can be achieved. Further, it is not necessary to greatly improve the structure around the bearing as in the related art, and it is sufficient to process only the step portion 22a. Therefore, the cost does not increase significantly and the space does not increase much.

Next, a rolling bearing according to a fourth embodiment of the present invention will be described. FIG. 5 shows a simplified cross-sectional view of a rolling bearing 30 according to a fourth embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 5, on the outside of the seal 35 of the rolling bearing 30 in the axial direction,
Two slinger type shield plates 36a and 36b which are bent at substantially right angles are provided. The shield plate 36
Reference numerals a and 36b each have an annular shape and face the seal 35 with a gap therebetween, and cover the seal 35. One end of each of the shield plates 36a and 36b
2 and the shaft 37. Here, the inner diameter of the inner ring 32 is larger than the inner ring of the first embodiment by the thickness of the shield plates 36a and 36b. Although the mounting type of the shield plates 36a and 36b is different from that of the first embodiment, the fourth embodiment can also provide the same operation and effects as those of the first embodiment. Further, it is not necessary to greatly improve the structure around the bearing as in the conventional case, and the inner diameter of the inner ring 32 may be increased by the thickness of the shield plates 36a and 36b. Also less.

Next, a rolling bearing according to a fifth embodiment of the present invention will be described. FIG. 6 shows a simplified cross-sectional view of a rolling bearing 40 according to a fifth embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 6, on the outside of the seal 45 of the rolling bearing 40 in the axial direction,
A slinger-type shield plate 46 bent at a substantially right angle is provided. The shield plate 46 has an annular shape and faces the seal 45 with a gap therebetween.
5 is covered. One end of the shield plate 46 is pressed into the outer diameter of the inner ring 42. Although the manner of mounting the shield plate 46 is different from that of the first embodiment, the fifth embodiment can also provide the same operation and effect as those of the first embodiment. Further, it is not necessary to greatly improve the structure around the bearing as in the conventional case, and only the outer diameter of the inner ring 42 and the shield plate 46 need to be processed, so that the cost does not increase significantly and the space does not increase much.

Next, a rolling bearing according to a sixth embodiment of the present invention will be described. FIG. 7 shows a simplified cross-sectional view of a rolling bearing 50 according to a sixth embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 7, on the axially outside of the seal 55 of the rolling bearing 50,
As in the first embodiment, a slinger-type flat shield plate 56 is sandwiched and mounted between the flat surface of the inner ring 52 and the retaining ring 59. The shield plate 56 has an annular shape, and faces the seal 55 with a gap, and covers the seal 55. Here, the shield plate 56 includes
The protrusion 55c of the rubber seal member 55a is in contact. Also in the case of the sixth embodiment, the same effects as in the first embodiment can be obtained, and in addition, the sealing member 5
Since the projection 55c of 5a is in contact with the shield plate 56, a sealed space is defined in the bearing, and the sealing performance is further improved. The configuration in which the protruding portion of the seal abuts on the shield plate can be applied to other embodiments, and the same effect is obtained in that case.

Next, a rolling bearing according to a seventh embodiment of the present invention will be described. FIG. 8 shows a simplified sectional view of a rolling bearing 60 according to a seventh embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 8, on the outside of the seal 65 of the rolling bearing 60 in the axial direction,
As in the first embodiment, a slinger-type flat shield plate 66 is sandwiched and mounted between the flat surface of the inner ring 62 and the retaining ring 69. The shield plate 66 has an annular shape and faces the seal 65 with a gap therebetween.
5 is covered. The inner race 62 is thinner than the inner race of the first embodiment, and the plane of the shield plate 66 is located on substantially the same plane as the plane of the outer race 63. In the case of the present embodiment, a labyrinth structure is provided between the inner diameter of the outer ring 63 and the outer diameter of the shield plate 66. Other operations and effects are the same as those of the first embodiment. Further, unlike the conventional case, there is no need to greatly improve the structure around the bearing, and only the width of the inner ring needs to be machined. Therefore, there is no significant increase in cost and space.

Next, a rolling bearing according to an eighth embodiment of the present invention will be described. FIG. 9 shows a simplified cross-sectional view of a rolling bearing 70 according to the eighth embodiment of the present invention. Note that
The differences from the first embodiment will be mainly described. As shown in FIG. 9, on the outside of the seal 75 of the rolling bearing 70 in the axial direction,
A slinger-type flat shield plate 76 is provided on the outer ring 7.
3 and the housing 78. The shield plate 76 has an annular shape, and faces the seal 75 with a gap, and covers the seal 75. Also in the case of the eighth embodiment, the same operation and effect as those of the above-described first embodiment can be obtained. In the eighth embodiment, the shield plate 76 is mounted on the outer ring 73. However, the mounting method can be changed as appropriate by applying the inner ring mounting embodiment described above.

Next, FIG. 10 is a diagram showing the number of materials and the amount of change when a water injection experiment was conducted on the conventional rolling bearing without the shield plate and the rolling bearing with the shield plate according to the first embodiment described above. Is shown. The water injection experiment is an experiment in which water is injected by spraying the test material from outside the rolling bearing, and the amount of change in the weight of the bearing is measured. The dimensions of the rolling bearing used in the experiment were an inner diameter of 35 mm,
Outer diameter 55 mm, width 20 mm, inner diameter of shield plate 3
Use 5mm, outer diameter 50.4mm, thickness 0.3mm,
The rotation speed of the bearing was 2000 rpm (outer ring rotation), the spray amount was 280 cc / min, and the pulley load was 4
0 kgf and the spray time is 2.5 hours.

As shown in FIG. 10, when the shield plate was attached to the rolling bearing, the amount of change in the bearing weight was almost negligible when the number of materials was one to six. On the other hand, in the case of the conventional bearing, the change in the bearing weight was about 4.7 g when the number of materials was 1, and the change in the bearing weight was about 5.1 g when the number of materials was 2. Was. That is, it can be seen that the weight of the conventional bearing increased due to the intrusion of water or the like into the interior. As described above, it can be seen from the experiment that the bearing provided with the shield plate has improved sealing performance.

It should be noted that the present invention is not limited to the above-described embodiment, but can be appropriately modified and improved based on the gist of the present invention. For example, the mounting type of the shield plate may be a type in which a groove is cut in at least one of the inner and outer rings of the seal and is caulked outside at least one of the inner and outer rings through the gap of the seal. Is also good. Further, the material of the shield plate is not limited to metal, but may be plastic or the like.

[0021]

As described above, according to the present invention, since the shield plate covering the seal is mounted on at least one of the inner and outer races, the seal itself does not directly collide with water or foreign matter. Since the shield plate faces the seal with a gap, a labyrinth is formed between the seal and the shield plate. Therefore, waterproofness and dustproofness can be improved. Further, since the seal rotates together with the inner ring or the outer ring, even if water or foreign matter enters between the seal and the shield plate, the water or foreign matter is blown out of the bearing by the centrifugal force of the seal itself. In addition, since the structure around the rolling bearing is not improved, the cost is low and the space increase is small.

[Brief description of the drawings]

FIG. 1 is a simplified sectional view of a rolling bearing according to a first embodiment of the present invention.

FIG. 2 is a simplified sectional view of a rolling bearing according to a second embodiment of the present invention.

FIG. 3A is a top view of a shield plate, and FIG.
FIG. 2 is a cross-sectional view taken along line SS in FIG.

FIG. 4 is a simplified sectional view of a rolling bearing according to a third embodiment of the present invention.

FIG. 5 is a simplified sectional view of a rolling bearing according to a fourth embodiment of the present invention.

FIG. 6 is a simplified sectional view of a rolling bearing according to a fifth embodiment of the present invention.

FIG. 7 is a simplified sectional view of a rolling bearing according to a sixth embodiment of the present invention.

FIG. 8 is a simplified sectional view of a rolling bearing according to a seventh embodiment of the present invention.

FIG. 9 is a simplified sectional view of a rolling bearing according to an eighth embodiment of the present invention.

FIG. 10 shows a conventional rolling bearing without a shield plate and the? It is a figure which shows the number of data at the time of the water injection experiment of the rolling bearing with which the shield plate was mounted in embodiment, and the amount of change.

FIG. 11 is a simplified sectional view of a conventional rolling bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 5 Seal 6 Shield plate 10 Rolling bearing 12 Inner ring 13 Outer ring 15 Seal 16 Shield plate 20 Rolling bearing 22 Inner ring 23 Outer ring 25 Seal 26 Shield plate 30 Rolling bearing 32 Inner ring 33 Outer ring 35 Seal 36 Bearing 42 Inner ring 43 Outer ring 45 Seal 46 Shield plate 50 Rolling bearing 52 Inner ring 53 Outer ring 55 Seal 56 Shield plate 60 Rolling bearing 62 Inner ring 63 Outer ring 65 Seal 66 Shield plate 70 Rolling bearing 72 Inner ring 73 Outer ring 75 Seal 76 Shield plate

Claims (1)

[Claims] 1. A rolling bearing having a seal mounted between inner and outer rings, wherein the seal covers the seal axially outside the seal and at least one of the inner and outer rings with a gap between the seal and the seal. A rolling bearing characterized by having a shield plate mounted thereon.