JP2021055817A - Sealing device - Google Patents

Abstract

To perform paint application or the like by a simple method without the necessity for applying processing such as masking to a sealing device when applying paint on an external peripheral face and coating the external peripheral face.SOLUTION: A sealing device 21 has: a seal member 24 for sealing an annular opening part between an inner member 12 and an outer member 11, preventing the intrusion of foreign matters from an external space, and fixed to either of the inner member 12 and the outer member 11; and a slinger 35 fixed to the other of the inner member 12 and the outer member 11 while opposing the seal member 24. The sealing device also has a clearance s in a radial direction between the seal member 24 and the slinger 35 over an entire periphery, and has a seal internal space E1 which is opened toward the external space in the clearance s and communicates therewith in a peripheral direction. The seal member 24 has an elastic member 30 having a lip protruding toward the slinger 35, and the elastic member 30 has a plurality of partitioning parts 42 for partitioning the seal internal space E1 in the peripheral direction while protruding toward the slinger 35.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sealing device.

The sealing device is used, for example, in a bearing device in which a rolling bearing is incorporated.
In a rolling bearing, an outer ring and an inner ring are coaxially combined via a rolling element, and the inner ring is rotatable with respect to the outer ring. An outer raceway surface is formed on the inner circumference of the outer ring, an inner raceway surface is formed on the outer circumference of the inner ring, and the rolling element rolls between the outer raceway surface and the inner raceway surface. Grease is sealed in the annular space (bearing internal space) between the outer ring and the inner ring, and each raceway surface is lubricated. When water or dust enters the bearing internal space, the raceway surface is damaged and abnormal noise or heat is generated during rotation. Therefore, a sealing device is incorporated in the openings on both sides of the bearing internal space in the axial direction. ..
In the sealing device, a metal member made of metal and a lip made of an elastic body such as rubber are integrally formed. In the sealing device of Patent Document 1, a metal member is press-fitted into the inner circumference of the outer ring and the lip is in elastic contact with the inner ring, and the lip is in sliding contact with the inner ring during rotation to seal the opening of the bearing internal space. ing.

When the bearing device is used in a state of being exposed to the outside air, the outer ring and the inner ring are rusted by being exposed to muddy water or salt water. When the rust becomes large, not only the appearance is deteriorated, but also the rust may infiltrate into the bearing beyond the sealing device. Therefore, in order to prevent the occurrence of rust, the outer peripheral surface of the bearing may be painted over the entire surface or coated with a coating agent.
Usually, coating or coating (hereinafter, coating or the like) is performed by spraying a coating or coating agent (hereinafter, coating agent) on the outer periphery of the bearing device by compressed air. At this time, if the sliding contact portion of the lip is painted or the like, the coating agent may infiltrate into the bearing internal space beyond the lip and adhere to the raceway surface to generate abnormal noise or generate heat. Therefore, when painting or the like, masking or the like is applied so as not to directly inject air containing a coating agent onto the sealing device.

JP-A-2019-007597

Patent Document 1 describes a form in which a sealing device is covered with a slinger in order to prevent air containing a coating agent from being directly injected onto the lip. However, in this case, it is necessary to assemble a slinger having a special shape to the conventional bearing device, which causes a problem that the manufacturing cost increases. Further, there is described a form in which the gap between the member on the outer ring side and the member on the inner ring side is closed with tape or the like to mask. In this case, the number of steps for assembling the bearing device is increased, so that the manufacturing cost is also increased.

Therefore, in view of the above circumstances, the present invention does not require a treatment such as masking when painting or coating a portion provided with a sealing device such as a bearing device, and prevents the paint from adhering to the lip portion. It is an object of the present invention to provide a sealing device capable of providing a sealing device.

One embodiment of the present invention seals an annular opening between an inner member having an annular outer circumference and an outer member that is coaxially combined radially outward of the inner member and has an annular inner circumference. A sealing device that prevents foreign matter from entering from the external space, and is a sealing member fixed to either the inner member or the outer member, or any of the inner member and the outer member. On the other hand, it has a slinger fixed so as to face the seal member, and has a radial gap between the seal member and the slinger over the entire circumference, and the gap is in the external space up to the gap. It has a seal interior space that opens toward and communicates in the circumferential direction, the seal member has an elastic member with a lip that projects toward the slinger, and the elastic member is further directed toward the slinger. It is characterized by having a plurality of partition portions projecting to partition the seal internal space in the circumferential direction.

According to the present invention, when painting or coating a portion provided with a sealing device such as a bearing device, processing such as masking is not required, and adhesion of the paint to the lip portion can be prevented. As a result, the cost of painting and the like can be reduced, so that it is possible to provide a bearing device or the like used under conditions of being exposed to muddy water or the like at a low cost.

It is sectional drawing in the axial direction of the bearing device which incorporated the sealing device of this embodiment. It is an enlarged view of the main part which enlarged the part of the 1st sealing device of FIG. It is sectional drawing of the 1st sealing apparatus at the position X of FIG. It is explanatory drawing of the painting process which paints the side surface on the inner side of a vehicle. FIG. 5A is a schematic diagram illustrating the movement of air between the partition portions, and FIG. 5B is a schematic diagram showing a state in which air containing a coating agent is injected toward the gap s. It is explanatory drawing explaining the flow of air when the conventional sealing device is used.

One embodiment of the sealing device according to the present invention (the present embodiment) will be described in detail with reference to the drawings. FIG. 1 is an axial sectional view of a bearing device 10 incorporating the sealing device of the present embodiment. The bearing device 10 is used for rotationally supporting wheels of automobiles and the like.

The bearing device 10 will be described. The bearing device 10 includes an outer ring 11 (outer member) fixed to the vehicle and an inner shaft 12 (inner member) for mounting the wheel. The inner shaft 12 can freely rotate around the central axis m with respect to the outer ring 11. In the following description, the direction of the central axis m is referred to as an axial direction, the direction orthogonal to the central axis m is referred to as a radial direction, and the direction orbiting around the central axis m is referred to as a circumferential direction. Further, the right side of the figure may be referred to as the vehicle inner side, and the left side may be referred to as the vehicle outer side.

The outer ring 11 is made of high carbon steel such as S55C, and has two rows of outer raceway surfaces 14 and 14 on the inner circumference on which balls 13 as rolling elements roll. A plurality of legs 15 for attaching the bearing device 10 to the vehicle body are formed on the outer circumference.

The inner shaft 12 is a form in which the inner ring 12a and the hub shaft 12b are integrally combined. The inner ring 12a is made of bearing steel such as SUJ2, and has a first inner raceway surface 16a on the outer circumference. The hub shaft 12b is made of high carbon steel such as S55C. A second inner raceway surface 16b is formed on the outer circumference of the hub shaft 12b. A hub flange 17 for mounting a wheel is formed at an axial end of the hub shaft 12b on the vehicle outer side. The inner ring 12a is firmly fixed to the hub shaft 12b by being fitted to the end of the hub shaft 12b on the vehicle inner side and then plastically deformed at the shaft end of the hub shaft 12b. In this way, two rows of inner raceway surfaces 16a and 16b on which the balls 13 roll are formed on the outer circumference of the inner shaft 12.

The outer ring 11 and the inner shaft 12 are coaxially combined, and a plurality of balls 13 are incorporated between the two rows of outer raceway surfaces 14, 14 and the two rows of inner raceway surfaces 16a, 16b, which face each other in the radial direction. The balls 13 in each row are rotatably held by the cage 18 at equal intervals in the circumferential direction. In this way, supported by two rows of balls, the inner shaft 12 can rotate with respect to the outer ring 11.

An annular space (hereinafter referred to as “bearing internal space K”) is formed between the inner circumference of the outer ring 11 and the outer circumference of the inner shaft 12. Grease is sealed in the bearing internal space K to lubricate the raceway surfaces 14, 14, 16a, 16b. The bearing internal space K is open on both sides in the axial direction, and sealing devices 21 and 22 are incorporated in the respective openings. The sealing devices 21 and 22 prevent water and dust from entering the bearing internal space K.

The sealing device of the present embodiment is attached to the opening on the vehicle inner side of the bearing device 10. Therefore, in the following description, the sealing device 21 on the inner side of the vehicle (hereinafter, the first sealing device) will be described in detail, and the sealing device 22 on the outer side of the vehicle (hereinafter, the second sealing device) will be briefly described. To do.

The first sealing device 21 will be described with reference to FIGS. 2 and 3. FIG. 2 is an enlarged view of a main part of FIG. 1 in which the portion of the first sealing device 21 is enlarged. FIG. 3 is a cross-sectional view of the entire first sealing device 21 as viewed in the direction of the arrow at the position X in FIG.

See FIG. The first sealing device 21 includes a slinger 35 and a sealing member 24.
The slinger 35 is formed by press-forming a thin-walled cold-rolled steel sheet such as SPCC. The slinger 35 is an annular body having a substantially L-shaped cross section in the axial direction and centered on the central axis m, and the collar portion 36 and the inner ring fitting portion 37 are integrally formed. The flange portion 36 is an annular flat plate, and is formed in a direction orthogonal to the central axis m. The inner ring fitting portion 37 has a cylindrical shape in which the inner circumference of the collar portion 36 is bent at a substantially right angle over the entire circumference and is coaxial with the central axis m.
In the slinger 35, the inner ring fitting portion 37 is fitted to the outer circumference of the inner ring 12a in a tightly fitted state, and is fixed to the end portion of the inner shaft 12 on the vehicle inner side.

The slinger 35 may have an encoder that generates a magnetic signal. In the present embodiment, the encoder 38 is installed on the side surface of the flange portion 36 of the slinger 35 on the vehicle inner side. The encoder 38 is formed of an elastic body such as rubber or synthetic resin containing magnetic powder, and its surface is magnetized to form a plurality of sets of S poles and N poles alternately in the circumferential direction. .. As a result, the rotational speed of the wheel can be detected by a magnetic detector (not shown). In the present embodiment, the encoder 38 is formed so as to be wound around the outer peripheral end portion of the collar portion 36 so as not to easily fall off. In the present embodiment, the encoder 38 is integrally formed with the slinger 35, and forms a part of the collar portion 36 of the slinger 35.

The sealing member 24 includes a metal member 25 formed by press-molding a thin-walled cold-rolled steel sheet such as SPCC, and an elastic member 30 manufactured of an elastic body such as nitrile butadiene rubber or acrylic rubber. There is.

The metal member 25 is an annular body having a substantially L-shaped cross section in the axial direction, and is formed by integrally connecting the flange portion 26 and the outer ring fitting portion 27. The flange portion 26 is an annular flat plate extending in a direction substantially orthogonal to the central axis m, and the outer ring fitting portion 27 is a cylinder whose outer circumference of the flange portion 26 is bent at a substantially right angle over the entire circumference and is coaxial with the central axis m. It has a shape.

The elastic member 30 includes a convex portion 27a provided on the outer periphery of the vehicle inner side end portion of the outer ring fitting portion 27, a lip portion 28 having a plurality of lips, an inner wall of the metal member 25, and a first outer ring. A thin film portion 29 formed in a thin film shape along the vehicle inner side end surface of the fitting portion 27 and connecting the convex portion 27a and the lip portion 28, and a partition portion 42 protruding from the thin film portion 29 are provided.

The lip portion 28 has one radial lip 28a protruding inward in the radial direction and two side lips 28b and 28c protruding in the axial direction. The radial lip 28a is in elastic contact with the outer circumference of the inner ring fitting portion 37, and the tip of the lip is bent outward in the radial direction. The side lips 28b and 28c are in elastic contact with the side surface of the flange portion 36, and the tip of the lip is bent toward the outer side of the vehicle in the axial direction. In this way, each lip comes into contact with the slinger 35 to seal the opening of the bearing internal space K, and prevents water and dust from entering from the external space toward the bearing internal space K.

As shown in FIG. 3, the partition portion 42 has a predetermined thickness in the circumferential direction, and is directed inward in the radial direction from a plurality of locations in the circumferential direction of the thin film portion 29 that covers the inner circumference of the outer ring fitting portion 27. It protrudes like a rib. In the first sealing device 21, partition portions 42 are installed at eight locations at equal intervals in the circumferential direction.
As shown in FIG. 2, the shape of the partition portion 42 when viewed in the circumferential direction is a substantially rectangular shape, and the outer end in the radial direction covers the inner circumference of the outer ring fitting portion 27 of the metal member 25. It is connected to the portion 29, and the end portion on the vehicle outer side is connected to the thin film portion 29 that covers the vehicle inner side side surface of the flange portion 26 of the metal member 25.

The partition portion 42, the convex portion 27a, the thin film portion 29, and the lip portion 28 are made of the same rubber material, and are simultaneously formed by vulcanization in a mold and adhered to the metal member 25. .. The partition portions 42 adjacent to each other in the circumferential direction and the partition portions 42 are connected by a thin film portion 29 formed along the metal member 25.
The thin film portion 29 does not necessarily have to be installed, and the partition portion 42 may be directly joined to the metal member 25 without passing through the thin film portion 29. However, as in the present embodiment, by providing the thin film portion 29, the thin film portion 29 is adhered to the metal member 25 over the entire circumference, so that the partition portion 42 is more firmly fixed to the metal member 25 over a wide area. Can be done.

As described above, in the seal member 24, the outer ring fitting portion 27 is fitted to the inner circumference of the outer ring 11 in a tightly fitted state, and is fixed to the end portion of the outer ring 11 on the vehicle inner side. The inner ring fitting portion 37 is fitted to the outer circumference of the inner ring 12a in a tightly fitted state, and is fixed to the end portion of the inner shaft 12 on the vehicle inner side. In this way, in the bearing device 10, the seal member 24 and the slinger 35 are arranged so as to face each other. At this time, the end surface of the seal member 24 on the vehicle inner side and the end surface of the slinger 35 on the vehicle inner side (the side surface of the encoder 38 on the vehicle inner side) are combined so as to be flush with each other.

The maximum diameter of the slinger 35 (in this embodiment, the outer diameter of the encoder 38) is smaller than the inner diameter of the thin film portion 29 that covers the inner circumference of the outer ring fitting portion 27 of the seal member 24. In the bearing device 10, the flange portion 36 including the encoder 38 of the slinger 35 is assembled so as to be located radially inward of the outer ring fitting portion 27 of the seal member 24, and the seal member 24 (inside the outer ring fitting portion 27) is assembled. An annular, axially penetrating radial gap s is formed between the slinger 35 (the outer diameter end of the encoder 38) and the thin film portion 29 (the inner circumference of the thin film portion 29) that covers the circumference.

In this way, the contact portions between the lips 28a, 28b, 28c and the slinger 35 are arranged so as to be located inside the gap s. This makes it possible to prevent the lip portion 28 from being directly exposed to water when the bearing device 10 is exposed to muddy water or the like. When the clearance s is large, the amount of water applied to the lip portion 28 increases and the sealing performance deteriorates. Therefore, the radial size of the clearance s is set to about 0.5 mm to 1 mm.

Further, inside the gap s, a seal internal space E1 surrounded by a thin film portion 29, a side lip 28c, and a flange portion 36 is formed. In the first sealing device 21, since a plurality of partition portions 42 are formed inside the sealing member 24, the sealing internal space E1 is divided into a plurality of regions in the circumferential direction.

The end surface 43 on the vehicle inner side of the partition portion 42 is formed at a position slightly distant from the flange portion 36 of the slinger 35 in the axial direction and in a direction substantially parallel to the flange portion 36. Further, the radial inner end surface 44 of the partition portion 42 is formed at a position close to the side lip 28c and in a direction substantially parallel to the central axis m.

Further, as shown in FIG. 1, a second sealing device 22 is assembled in the opening on the vehicle outer side of the bearing internal space K, so that water and dust infiltrate from the external space toward the bearing internal space K. Is being prevented.
The second sealing device 22 includes a metal member 32 made of a cold-rolled steel plate or the like, and an elastic member 33 made of an elastic body such as nitrile butadiene rubber or acrylic rubber. The elastic member 33 includes one radial lip projecting inward in the radial direction and two side lips projecting in the axial direction. Each lip is in elastic contact with the outer circumference of the hub shaft 12b.

Next, a method of manufacturing the bearing device 10 will be described with reference to FIG. The method for manufacturing the bearing device 10 includes an assembly process and a painting process. After assembling each component in the assembly process, the entire outer peripheral surface of the bearing device 10 is painted or coated in the painting process.

In the assembly process, the second sealing device 22 is fixed to the outer ring 11, and the balls 13 and the cage 18 are incorporated into the ball row on the outer side of the vehicle, and the outer ring 11 and the hub shaft 12b are coaxially combined. Next, the ball 13 and the cage 18 are incorporated in the ball row on the inner side of the vehicle, and the inner ring 12a is fixed to the end of the hub shaft 12b. Grease is sealed in the bearing internal space K.

After that, the first sealing device 21 is assembled to the opening on the inner side of the bearing internal space K. At this time, the seal member 24 and the slinger 35 are combined as shown in FIG. 2, and the outer ring fitting portion 27 of the seal member 24 is placed on the inner circumference of the outer ring 11 while maintaining the positional relationship with each other. The inner ring fitting portion 37 is press-fitted into the outer circumference of the inner ring 12a at the same time. As a result, the first sealing device 21 is assembled so that the lips 28a, 28b, 28c and the slinger 35 come into contact with each other with an appropriate margin.

Next, the painting process will be described. FIG. 4 is an explanatory diagram illustrating a painting process.
In the painting process, after the bearing device 10 is assembled, painting or coating (hereinafter referred to as “painting or the like”) is applied to the entire outer circumference of the bearing device 10. The work such as painting is performed by injecting a paint or a coating agent (hereinafter referred to as “coating agent”) from the tip of the painting nozzle 40 with compressed air. As the coating agent, a zinc flake coating agent or the like is used. This makes it possible to prevent rust from forming on the outer peripheral surface of the bearing device 10. The film thickness of the applied coating agent is approximately 10 μm to 50 μm.

FIG. 4 shows a state in which the side surface of the bearing device 10 on the inner side of the vehicle in which the first sealing device 21 is incorporated is painted or the like. When painting or the like, while rotating the entire bearing device 10 around the central axis m, the painting nozzle 40 is directed from position A to position D along the outer periphery of the bearing device 10 in a plane including the central axis m. And move it continuously.

When painting or the like at the position B, the injection region of the coating nozzle 40 faces the first sealing device 21 in the axial direction, and the air containing the coating agent is allowed to flow in the gap s between the sealing member 24 and the slinger 35. Is jetted toward. The injection region refers to a region in which air containing a coating agent exists before reaching the surface of the bearing device 10 after being injected from the coating nozzle 40.
In the first sealing device 21 of the present embodiment, by providing the partition portion 42, even when the air containing the coating agent is injected toward the gap s in this way, the coating agent penetrates to the lip portion 28. Can be suppressed.

In order to facilitate understanding of the action and effect of the present embodiment, the air flow when it is assumed that the seal member 24 does not have the partition portion 42 will be described. FIG. 6 is an explanation for explaining the flow of air in the seal internal space E2 when air containing a coating agent is injected toward the sealing device 21z when the sealing device 21z having no partition 42 is used. It is a figure. FIG. 6A is an axial cross-sectional view of the sealing device 21z, showing a state in which air containing a coating agent is injected toward the sealing device 21z. FIG. 6B is a cross-sectional view taken along the line YY of FIG. 6A, and is a schematic view showing the flow of air flowing through the seal internal space E2.

As shown in FIG. 6A, when the coating nozzle 40 is arranged at a position facing the clearance s in the axial direction, the air containing the coating agent ejected from the coating nozzle 40 (the air at this time). The flow is indicated by P1), but urges the air in the seal internal space E2 in the circumferential direction. As a result, the air in the seal internal space E2 flows in the circumferential direction in the direction indicated by P2 and flows out from each position in the circumferential direction of the clearance s (the air flow at this time is indicated by P3).
When the partition portion 42 is not provided in this way, the air in the seal internal space E2 easily flows in the circumferential direction and can flow out from the seal internal space E2, so that the coating agent sprayed toward the gap s is included. The air P1 can easily flow into the seal internal space E2 without any resistance. In this way, in the sealing device 21z in which the sealing member 24 does not have the partition portion 42, the air containing the coating agent ejected from the coating nozzle 40 easily flows into the seal internal space E2, and the lips 28a, 28b, and 28c are slid. The coating agent adheres to the contact part.

On the other hand, in the present embodiment, the air flow in the seal internal space E1 is obstructed by providing the partition portion 42.
FIG. 5 is an explanatory diagram illustrating the operation and effect of the present embodiment. FIG. 5B schematically shows a part of the circumferential direction of the first sealing device 21 when viewed in the direction indicated by the white arrow H in FIG. 2, and the coating nozzle 40 to the sealing member 24 It shows a state in which air containing a coating agent is injected toward the gap s between the slinger 35 and the outer circumference of the slinger 35 (the outer circumference of the encoder 38). The air containing the coating agent is ejected by the coating nozzle 40 from the front to the back perpendicularly to the paper surface of FIG. 5 (a) is a schematic view of the cross section at the position of ZZ in FIG. 5 (b) viewed in the direction of the arrow, and is a seal internal space between the partition portions 42 and 42 adjacent to each other in the circumferential direction. It shows the movement of the air in E1.

When the coating agent is sprayed from the coating nozzle 40 toward the gap s together with the compressed air, the air in the seal internal space E1 is urged in the circumferential direction toward the partition portion 42. In FIGS. 5A and 5B, the movement of the air urged toward the partition 42 is indicated by an arrow G.
However, since the flow of air in the direction of the arrow G is immediately blocked by the partition portion 42, the air in the seal internal space E1 can hardly flow. Therefore, even when the compressed air is injected toward the gap s, the air staying in the seal internal space E1 does not flow out, so there is no room for new compressed air to enter. Therefore, it is possible to prevent the air containing the coating agent from flowing into the seal internal space E1 through the gap s.

Further, when air is injected toward the gap s, the air inside the seal internal space E1 is urged in the circumferential direction by the air that has passed through the gap s. Therefore, if at least a part of the partition portion 42 in the radial direction is formed at a position that overlaps the radial position of the clearance s in the axial direction, the flow of air in the seal internal space E1 in the circumferential direction is suppressed. be able to. That is, by setting the radial dimension h of the partition portion 42 (see FIG. 5B) to be at least larger than the radial dimension of the clearance s, the seal internal space is created by injecting air toward the clearance s. The movement of the air in the E1 in the circumferential direction can be effectively suppressed.

In this way, in the first sealing device 21 of the present embodiment, the partition portion 42 is provided to suppress the flow of air in the seal internal space E1 to prevent the coating agent from entering the seal internal space E1. Therefore, the air containing the coating agent injected from the coating nozzle 40 flows along the surface of the bearing device 10 on the vehicle inner side, and the outer peripheral surface of the bearing device 10 can be coated or the like.

In the present embodiment, eight partition portions 42 are installed in the circumferential direction, and the seal internal space E1 is divided into eight regions in the circumferential direction. In each region, the action and effect of suppressing the flow of air flowing in from the gap s are similar to each other. Therefore, by painting or the like while rotating the bearing device 10 around the central axis m, it is possible to prevent air containing the coating agent from flowing into the seal internal space E1 all around the clearance s, and to prevent the air from flowing into the seal internal space E1. Painting or the like can be applied to the entire surface of the side surface. The number of sections is an example and is not limited to this.

In the present embodiment, the radial inner end surface 44 of the partition portion 42 is formed at a position close to the side lip 28c and parallel to the central axis m, but the present invention is not limited to this. For example, as shown by the alternate long and short dash line W in FIG. 2, the shape may be close to the outer circumference of the side lip 28c. By bringing the radial inner end surface 44 of the partition portion 42 close to the side lip 28c, the flow of air in the seal internal space E1 can be more reliably suppressed, so that the air containing the coating agent flows into the seal internal space E1. Can be prevented more reliably.

As described above, in the first sealing device 21 of the present embodiment, the bearing while suppressing the air containing the coating agent from flowing into the seal internal space E1 by a simple method that does not require a process such as masking. Work such as painting can be performed on the entire surface of the device 10. As a result, the cost of painting and the like can be reduced, so that a bearing device and the like having excellent rust prevention performance can be provided at low cost.
Further, since the coating agent does not penetrate beyond the lip portion 28 into the bearing internal space K, the rotational performance of the bearing device 10 can be maintained satisfactorily for a long period of time.

It should be noted that the above-described embodiment is merely an example for carrying out the present invention. The present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof. For example, in the present embodiment, the case where the seal member 24 is incorporated in the inner circumference of the outer ring 11 and the slinger 35 is incorporated in the outer circumference of the inner ring 12a has been described as an example. The seal member 24 may be incorporated in the inner circumference of the outer ring 11 and may be incorporated in the outer circumference of the inner ring 12a.

10: Bearing device, 11: Outer ring, 12: Inner shaft, 12a: Inner ring, 12b: Hub shaft, 13: Ball, 14: Outer raceway surface, 15: Leg, 16a: First inner raceway surface, 16b: First 2 inner raceway surface, 17: hub flange, 18: cage, 21: first sealing device, 22: second sealing device, 24: sealing member, 25: metal member, 26: flange part, 27: outer ring fitting Part, 27a: Convex part, 28: Lip part, 28a: Radial lip, 28b: Side lip, 28c: Side lip, 29: Thin film part, 30: Elastic member, 35: Slinger, 36: Flange part, 37: Inner ring fitting Joint part, 38: Encoder, 40: Paint nozzle, 42: Partition part

Claims (4)

An annular opening is sealed between an inner member having an annular outer circumference and an outer member having an annular inner circumference that is coaxially combined radially outward of the inner member to seal a foreign object from an external space. It is a sealing device that prevents the ingress of
A seal member fixed to either the inner member or the outer member,
One of the inner member and the outer member has a slinger fixed so as to face the seal member.
There is a radial gap over the entire circumference between the seal member and the slinger, and there is a seal internal space that opens toward the external space to the gap and communicates in the circumferential direction.
The seal member has an elastic member having a lip that projects toward the slinger, and the elastic member projects toward the slinger and a plurality of partition portions that partition the seal internal space in the circumferential direction. A sealing device characterized by having. The sealing device according to claim 1, wherein the radial dimension of the partition portion is larger than the radial dimension of the clearance. The sealing device according to claim 2, wherein at least a part thereof is coated with a coating agent. The sealing device according to claim 3, wherein the coating agent is sprayed together with compressed air.

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