JP2021055770A - Manufacturing method of bearing device - Google Patents

Abstract

To apply a coating or the like on an entire surface of a bearing device by a simple method without the necessity for applying processing such as masking to a sealing device.SOLUTION: A bearing device 10 has an outer member 11, an inner member 12 and a plurality of rolling bodies 13. A sealing device 21 is arranged at an end part of a bearing internal space K between the outer member 11 and the inner member 12. The bearing device 10 has an annular clearance s1 in which the outer member 11 and the inner member 12 are formed while approximating each other, and the sealing device 21 has a seal internal space E1 which is opened in the annular clearance s1 and communicates therewith in a peripheral direction. A manufacturing method has a spray process for spraying a coating agent for coating an outer face of the bearing device 10 together with air in at least one point of a region including the clearance s1, and an air-sending process for sending air to the seal internal space E1 via the clearance s1 in a point separated from the one point. The spray process and the air-sending process are simultaneously performed.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for manufacturing a bearing device, particularly a method for applying a coating or coating to the outer periphery of the bearing device.

In a rolling bearing, an outer ring and an inner ring are coaxially combined via a rolling element. An outer raceway surface is formed on the inner circumference of the outer ring, and an inner raceway surface is formed on the outer circumference of the inner ring, and the rolling element rolls on the raceway surface.
Grease is sealed in the annular space (bearing internal space) between the outer ring and the inner ring to lubricate the raceway surface. If water, dust, or the like enters the internal space of the bearing, the raceway surface may be damaged, causing abnormal noise or heat generation during rotation. For this reason, a sealing device is incorporated in the openings on both sides of the bearing internal space in the axial direction.
However, a bearing device used in a state of being exposed to the outside air, such as a bearing device for a wheel of an automobile, may rust on the outer ring and the inner ring when it is 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 coated with a paint or a coating agent over the entire outer peripheral surface of the bearing.

JP-A-2019-007597

Normally, when coating with a paint or a coating agent (hereinafter referred to as a coating agent), the coating agent is sprayed on the outer periphery of the bearing device by compressed air. Therefore, when the coating agent is sprayed between the outer ring and the inner ring where the sealing device is incorporated, the coating agent adheres to the rubber lip constituting the sealing device, and the coating agent further coats the lip. If it penetrates into the internal space of the bearing beyond that, it may adhere to the raceway surface and generate abnormal noise or generate heat.
For this reason, when spraying the coating agent, it is necessary to perform processing such as masking on the part of the sealing device, but if a masking device or the like is installed, not only the installation cost of the device but also the work man-hours for masking are required, and the bearing device. There is a problem that the manufacturing cost of the bearing rises.

In view of the above circumstances, the present invention is a simple method that does not require masking or the like for the sealing device when painting or coating (painting or the like) the outer peripheral surface of the bearing device in the manufacturing process of the bearing device. The purpose is to make it possible to paint the entire surface of the bearing device.

One embodiment of the present invention includes an outer member having an outer raceway surface on the inner circumference, an inner member having an inner raceway surface on the outer circumference, and a plurality of arrangements arranged between the outer raceway surface and the inner raceway surface. A method for manufacturing a bearing device in which a rolling element and a sealing device are arranged at an end of a bearing internal space between the outer member and the inner member. The bearing device is the outer member and the inner member. The sealing device has an annular gap formed in close proximity to the square members, and the sealing device has a seal internal space that opens to the annular gap and communicates in the circumferential direction, and is a region including the gap. At least in one place, a coating step of spraying a coating agent covering the outer surface of the bearing device together with air, and in a place separated from the one place, air is sent to the seal internal space through the gap. It has an air step, and is characterized in that the coating step and the air feeding step are performed at the same time.

According to the present invention, when painting or coating the outer peripheral surface of the bearing device in the manufacturing process of the bearing device, the sealing device does not need to be masked or the like, and the entire surface of the bearing device is painted or the like by a simple method. can do. As a result, it is possible to prevent foreign matter such as a coating agent from entering the bearing internal space, maintain a good rotational condition for a long period of time, suppress costs such as painting, and provide an inexpensive bearing device.

It is sectional drawing in the axial direction of the bearing apparatus manufactured by this embodiment. It is sectional drawing in the axial direction of the 1st sealing device attached to the opening on the inner side of a vehicle. It is sectional drawing in the axial direction of the 2nd sealing device attached to the opening on the outer side of a vehicle. It is explanatory drawing explaining the coating process of this embodiment. It is a schematic diagram which shows the arrangement of each nozzle when painting or the like on the side surface on the inner side of a vehicle. It is explanatory drawing explaining the flow of the paint at the time of painting or the like by the conventional method.

One embodiment (the present embodiment) of the method for manufacturing a bearing device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an axial sectional view of the bearing device 10 manufactured by 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 on the inner circumference on which balls 13 as rolling elements roll. A plurality of flanges 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 axial end of the hub shaft 12b on the vehicle inner side and then plastically deformed and crimped 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 the two rows of outer raceway surfaces 14 and 14 formed on the outer ring 11 and the two rows of inner raceway surfaces 16a and 16b formed on the inner shaft 12 are mutually formed. They face each other in the radial direction. A plurality of balls 13 are incorporated between the raceway surfaces facing each other to form two rows of balls. The balls 13 in each row are rotatably held by the cage 18 at equal intervals in the circumferential direction. In this way, 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 and 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.

FIG. 2 is an axial sectional view showing the shape of the first sealing device 21 mounted on the opening on the vehicle inner side of the bearing internal space K. The first sealing device 21 includes a sealing member 24 fixed to the outer ring 11 and a slinger 35 fixed to the inner shaft 12.

The sealing member 24 includes a metal member 25 formed by press-molding a thin-walled cold-rolled steel sheet or the like, and an elastic member 30 made of an elastic body such as nitrile butadiene rubber or acrylic rubber.
The metal member 25 is an annular body having a substantially L-shaped cross section in the axial direction, and includes a first lip holding portion 26 (first disk portion) and a first outer ring fitting portion 27. The first lip holding portion 26 is an annular flat plate extending in a direction orthogonal to the central axis m, and the outer ring fitting portion 27 of the first outer ring fitting portion 27 has the outer circumference of the first lip holding portion 26 substantially perpendicular to the entire circumference. It is bent into a cylindrical shape coaxial with the central axis m.
The elastic member 30 includes a convex portion 27a provided on the outer periphery of the vehicle inner side end portion of the first outer ring fitting portion 27, a lip portion 28 having a plurality of lips, an inner wall of the metal member 25, and a third. 1 A thin film portion 29 formed in a thin film shape along the vehicle inner side end surface of the outer ring fitting portion 27 and connecting the convex portion 27a and the lip portion 28 is provided. The convex portion 27a, the lip portion 28, and the thin film portion 29 are integrally formed by vulcanization molding and are adhered to the metal member 25. The lip portion 28 includes one radial lip 28a protruding inward in the radial direction and two side lips 28b and 28c protruding in the axial direction.
The first outer ring fitting portion 27, the convex portion 27a, and a part of the thin film portion 29 (the portion of the thin film portion 29 that covers the inner circumference of the first outer ring fitting portion 27) constitutes the first cylindrical portion of the seal member 24. To do. Further, the first lip holding portion 26, the lip portion 28, and the other portion of the thin film portion 29 (the portion of the thin film portion 29 that covers the inner wall of the first lip holding portion 26) constitutes the first disk portion of the sealing member 24. To do. The first cylindrical portion is fixed to the inner circumference of the outer ring 11. At this time, the convex portion 27a is in elastic contact with the outer ring 11, and the fitting portion between the outer ring 11 and the first outer ring fitting portion 27 is sealed.

The slinger 35 is formed by press-molding a thin-walled cold-rolled steel sheet or the like. The slinger 35 is an annular body having a substantially L-shaped cross section in the axial direction, and includes a collar portion 36 and an inner ring fitting portion 37 (second cylindrical portion). The collar portion 36 is an annular flat plate extending in a direction orthogonal to the central axis m, and the inner ring fitting portion 37 is coaxial with the central axis m by bending the inner circumference of the collar portion 36 at a substantially right angle over the entire circumference. It has a cylindrical shape.

The slinger 35 may have an encoder that generates a magnetic signal. In the present embodiment, the slinger 35 has an encoder 38 attached to the side surface of the collar portion 36 on the vehicle inner side. A plurality of sets of S pole and N pole regions of permanent magnets are alternately arranged in the circumferential direction in the encoder 38, and the rotation speed of the wheel can be detected by a magnetic detector (not shown). The encoder 38 is formed of an elastic body such as rubber or synthetic resin containing magnetic powder, and in the present embodiment, the encoder 38 is integrally formed with the slinger 35 so as to cover the outer periphery of the collar portion 36. The flange portion 36 and the encoder 38 form a second disk portion of the slinger 35.

In the seal member 24, the first cylindrical portion 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, and the first disk portion is the first. It extends in the radial direction from the end (one end in the axial direction) of the cylindrical portion on the vehicle outer side. In the slinger 35, the second cylindrical portion is fitted to the outer periphery of the inner ring 12a in a tightly fitted state and fixed to the end portion of the inner shaft 12 on the vehicle inner side, and the second disk portion is the second cylinder. The portion extends in the radial direction from the end portion (the other end in the axial direction) on the vehicle inner side. In this way, the seal member 24 and the slinger 35 are arranged so as to face each other.

Each of the lips 28a, 28b, 28c formed on the lip portion 28 projects toward the slinger 35. 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 of the lips 28a, 28b, 28c seals the opening of the bearing internal space K between the outer ring 11 and the inner shaft 12, and water and dust enter from the outer space toward the bearing internal space K. Is prevented.

Further, the seal member 24 and the slinger 35 are close to each other on the external space side of the lip portion 28 (opposite to the bearing internal space K with respect to the lip portion 28). The outer diameter of the second disc of the slinger 35 is smaller than the inner diameter of the first cylinder of the sealing member 24, and there is an annular gap between the first cylinder and the second disc. s1 is formed. In the present embodiment, the encoder 38 covers the outer diameter side end of the flange portion 36 of the slinger 35, and the clearance s1 is a thin film covering the outer diameter side end surface of the encoder 38 and the inner circumference of the first outer ring fitting portion 27. It is formed between the portion 29 and the portion 29. When the slinger 35 does not have the encoder 38, the clearance s1 is formed between the outer diameter side end face of the flange portion 36 of the slinger 35 and the thin film portion 29.
In this way, in the present embodiment, the seal member 24 is press-fitted into the outer ring 11, the slinger 35 is press-fitted into the outer circumference of the inner ring 12a which is a part of the inner shaft 12, and the clearance s1 is substantially the same as the outer ring 11. The inner shaft 12 is formed in close proximity to each other.

Since the outer ring 11 and the inner shaft 12 are substantially close to each other on the outer space side of the lip portion 28, when the bearing device 10 is exposed to muddy water or the like, the outer ring 11 and the inner shaft 12 serve as a barrier. It is possible to prevent the lip portion 28 from being directly exposed to water. When the clearance s1 is large, the amount of water applied to the lip portion 28 increases and the sealing performance deteriorates. Therefore, the size of the clearance s1 is set to about 0.5 mm to 1 mm.

In the first sealing device 21, a seal internal space E1 that is surrounded by the thin film portion 29 of the sealing member 24, the side lip 28c, and the flange portion 36 of the slinger 35 and communicates in the circumferential direction is formed inside the clearance s1. Has been done. That is, the first sealing device 21 has a seal internal space E1 communicating in the circumferential direction, and the seal internal space E1 is an external space through a gap s1 in which the outer ring 11 and the inner shaft 12 are formed in close proximity to each other. It opens toward.

Next, a method of manufacturing the bearing device 10 will be described.
The manufacturing process of the bearing device 10 includes an assembly process of assembling the bearing device 10 and a coating process of painting or coating the outer periphery of the bearing device 10.
See FIG. In the assembly process, first, the second sealing device 22 (details will be described later) is fixed to the outer ring 11, the ball 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 formed. Combined coaxially. Next, the ball 13 and the cage 18 are incorporated into the ball row on the inner side of the vehicle, and then the inner ring 12a is fixed to the axial end of the hub shaft 12b. Grease is sealed in the bearing internal space K.
After that, the seal member 24 and the slinger 35 are combined so as to face each other, and are simultaneously press-fitted into the inner circumference of the outer ring 11 and the outer circumference of the inner ring 12a while maintaining a predetermined positional relationship. In this way, the first sealing device 21 is assembled to the opening on the vehicle inner side of the bearing device 10.

FIG. 4 is an explanatory diagram illustrating a coating process of the present embodiment.
In the painting process, after each component of 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. As a result, the outer peripheral surface of the bearing device 10 is coated with a paint or a coating agent (hereinafter, referred to as “coating agent”). Work such as painting is performed by injecting compressed air containing a coating agent from the tip of the painting nozzle 41. As the coating agent, a material having rust preventive performance is used, and a zinc flake coating agent or the like is preferably used. The thickness of the coating agent when applied to the outer surface of the bearing device 10 is approximately 10 μm to 50 μm. The material of the coating agent is an example, and various coating agents can be used depending on the purpose.
For painting and the like, while rotating the entire bearing device 10 around the central axis m, as shown in FIG. 4, the painting nozzle 41 is axially and radially along the outer circumference of the bearing device 10 from A to F. It is performed by continuously moving to.

In this embodiment, it is particularly effective when the outer periphery of the portion where the first sealing device 21 or the second sealing device 22 is mounted is painted or the like at the position where the coating nozzle 41 is indicated by A or D in FIG. .. Hereinafter, when painting or the like on the side surface on the inner side of the vehicle, the painting nozzle 41 is at the position A, that is, the injection region of the painting nozzle 41 is at a position facing the clearance s1 of the first sealing device 21 in the axial direction. , The case where the coating agent is sprayed into the region including the gap s1 will be described in detail as an example. 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 41.

When painting or the like on the side surface on the inner side of the vehicle, the painting nozzle 41 and the air nozzle 42 are used. FIG. 5A schematically shows the axial cross section of the first sealing device 21 incorporated in the bearing device 10 and the orientation of the nozzles 41 and 42, and FIG. 5B schematically shows the axial direction. The arrangement of the nozzles 41 and 42 when viewed from above is shown.
Note that FIG. 5B is shown in a cross section taken along the line XX of FIG. 5A in order to explain the flow of air flowing through the seal internal space E1. Further, for convenience of explanation, the position of the outer diameter side end face of the second disk portion of the slinger 35 forming the clearance s1 (in the present embodiment, it is the outer diameter side end face of the encoder 38) is shown by a broken line. There is.

When painting or the like on the side surface on the inner side of the vehicle, a coating step of injecting a coating agent from the coating nozzle 41 and an air supply step of injecting only air from a plurality of air nozzles 42 are simultaneously performed.

In the coating process, one coating nozzle 41 is used. The coating nozzle 41 is a nozzle that injects a coating material with compressed air.
At the position A in FIG. 4, the injection region of the coating nozzle 41 faces the first sealing device 21 in the axial direction, and the coating agent is injected in the same direction as the central axis m. Since the bearing device 10 rotates around the central axis m, as shown in FIG. 5A, the coating nozzle 41 injects the coating material in the direction of the central axis m and has a diameter in the direction indicated by the arrow G. By changing the position in the direction, the entire surface of the side surface of the bearing device 10 on the vehicle inner side can be painted or the like.

In the air supply process, a plurality of air nozzles 42 are used. The air nozzle 42 is a nozzle that injects only air and does not inject a coating material. As shown in FIG. 5B, in the present embodiment, seven air nozzles 42 are arranged at equal intervals in the circumferential direction with the coating nozzle 41 interposed therebetween.
The position of the air nozzle 42 is fixed, and even when the coating nozzle 41 is displaced, air is always injected toward the clearance s1.
The pressure of the compressed air (air pressure) injected from each air nozzle 42 is equivalent to the pressure of the compressed air (spray pressure) when the coating agent is injected from the coating nozzle 41.

In this way, since the plurality of air nozzles 42 are arranged apart from each other in the circumferential direction, air is simultaneously injected at a plurality of positions (air supply points) in the circumferential direction with respect to the clearance s1. As a result, the seal internal space E1 is filled with the air injected from the air nozzle 42, so that the air containing the coating agent injected from the coating nozzle 41 flows in the circumferential direction through the seal internal space E1. It can be blocked.
Further, since each air nozzle 42 is arranged at a position separated from the position of the coating nozzle 41 in the circumferential direction, air flows from the seal internal space E1 toward the external space at the position of the coating nozzle 41. Therefore, it is possible to reliably prevent the air containing the coating agent jetted from the coating nozzle 41 from flowing into the seal internal space E1 from the gap s1.

In this way, in the manufacturing method of the present embodiment, it is possible to effectively prevent the sprayed air containing the coating agent from flowing into the seal internal space E1 through the gap s1.

In FIG. 6, in order to more clearly understand the effect of the present embodiment, it is assumed that the air nozzle 42 is not installed and the coating is performed by only one coating nozzle 41, and the air containing the coating agent is shown in FIG. It is explanatory drawing explaining the flow. FIG. 6B is a cross-sectional view taken in the direction of the arrow at the position XX of FIG. 6A. In FIG. 6B, the display of the coating nozzle 41 is omitted, and the flow of air containing the coating agent is indicated by a solid arrow.
As shown in FIG. 6A, the coating nozzle 41 is arranged so that the injection region of the coating nozzle 41 faces the clearance s1 in the axial direction, and air containing the coating agent is ejected toward the clearance s1. (The air flow at this time is shown by P1 in FIG. 6 (b)). The air containing the coating agent injected from the coating nozzle 41 flows into the seal internal space E1 through the gap s1 (P2). After that, the air containing the coating agent flows in the seal internal space E1 in the circumferential direction, and flows out to the external space again from each position in the circumferential direction of the clearance s1 (the same P3). In this way, when painting or the like is performed with only one coating nozzle 41, the seal internal space E1 serves as a flow passage for the air containing the coating agent, and the air containing the coating agent ejected from the coating nozzle 41 can be easily provided. Flow. Thus, in the tentative embodiment as shown in FIG. 6, the coating agent adheres to the wall surface of the seal internal space E1.

On the other hand, in the present embodiment, the air nozzle 42 injects air into the seal internal space E1 to block the flow of air in the seal internal space E1 in the circumferential direction, so that the coating agent injected from the coating nozzle 41 is used. It is possible to prevent the contained air from flowing into the seal internal space E1. Therefore, the air containing the coating agent injected from the coating nozzle 41 cannot flow toward the seal internal space E1, and the coating agent is applied to the side surface of the bearing device 10 on the vehicle inner side. In this way, it is possible to paint the outer ring 11 and the vehicle inner side side surface of the first sealing device 21 while preventing the air containing the coating agent from flowing into the seal internal space E1.

The number of the nozzles 41 and 42 is an example, and a plurality of coating nozzles 41 may be installed, or the number of air nozzles 42 may be any number of 1 or more.
Further, the pressure of the compressed air injected from each air nozzle 42 may be equal to or higher than the pressure of the compressed air when the coating agent is injected from the coating nozzle 41. This is because the air pressure including the coating agent injected from the coating nozzle 41 can be more reliably prevented from flowing into the seal internal space E1 by making the air pressure larger than the air pressure injected from the air nozzle 42.

In this way, according to the manufacturing method of the present embodiment, even when the entire surface of the bearing device 10 is painted or the like, the air containing the coating agent is released into the seal internal space E1 by a simple method that does not require a treatment such as masking. It is possible to prevent the bearing device 10 from flowing into the water and effectively paint the surface of the bearing device 10 to be exposed to water. Further, since the air containing the coating agent does not flow into the seal internal space E1, the coating agent does not enter the bearing internal space K beyond the lip portion 28. Therefore, the rotational performance of the bearing device 10 can be maintained satisfactorily for a long period of time.

In the present embodiment, the case where the first cylindrical portion of the seal member 24 is fixed to the inner circumference of the outer ring 11 and the second cylindrical portion of the slinger 35 is fixed to the outer circumference of the inner ring 12a has been described as an example. On the contrary, the second cylindrical portion of the slinger 35 may be fixed to the inner circumference of the outer ring 11, and the first cylindrical portion of the seal member 24 may be fixed to the outer circumference of the inner ring 12a.

The operation and effect of the present invention have been described above by taking as an example a case where the inner side of the vehicle of the bearing device 10 is painted or the like. However, as described below, it can also be applied to the case where the opening on the outer side of the vehicle to which the second sealing device 22 is mounted is painted or the like. A painting method for painting or the like at the position shown by D in FIG. 4 will be described. The same operation as when painting or the like on the side of the first sealing device 21 will be briefly described.

FIG. 3 is a cross-sectional view showing the shape of the axial cross section of the second sealing device 22 mounted on the opening on the vehicle outer side of the bearing internal space K.

The second sealing device 22 includes a metal member 44 made of a cold-rolled steel plate or the like, and an elastic member 47 made of an elastic body such as nitrile butadiene rubber or acrylic rubber. The metal member 44 is an annular body having a substantially L-shaped cross section in the axial direction, and includes a second lip holding portion 45 and a second outer ring fitting portion 46. The second lip holding portion 45 is an annular plate material formed in a direction orthogonal to the central axis m, and the outer ring fitting portion 46 of the second outer ring fitting portion 46 is bent at a substantially right angle over the entire circumference of the second lip holding portion 45. It has a cylindrical shape coaxial with the central axis m.
The elastic member 47 includes one radial lip 47a protruding inward in the radial direction and two side lips 47b and 47c protruding in the axial direction. Each lip 47a, 47b, 47c is integrally formed with the metal member 44 by vulcanization molding.

The second sealing device 22 is fixed to the end of the outer ring 11 on the vehicle outer side. The second outer ring fitting portion 46 is fitted to the inner circumference of the outer ring 11 in a tightly fitted state.
The lips 47a, 47b, 47c are in elastic contact with the outer circumference of the hub shaft 12b, the lip tips of the radial lips 47a bend outward in the radial direction, and the lip tips of the side lips 47b, 47c are axially on the vehicle inner side. It is bent to. In this way, each of the lips 47a, 47b, 47c seals the opening on the vehicle outer side of the bearing internal space K between the outer ring 11 and the inner shaft 12, and water and dust are sealed from the external space toward the bearing internal space K. Is prevented from invading.

On the outer space side of the second sealing device 22 (opposite to the bearing inner space K with respect to the elastic member 47), the outer ring 11 and the hub flange 17 are close to each other in the axial direction, and the outer ring 11 is in the axial direction. An axial clearance s2 is formed over the entire circumference between the vehicle outer side end surface and the vehicle inner side end surface of the hub flange 17. Inside the clearance s2, a space (seal internal space E2) that is surrounded by the elastic member 47, the outer ring 11, and the hub shaft 12b (hub flange 17) and communicates in the circumferential direction is formed. That is, the second sealing device 22 has a seal internal space E2 communicating in the circumferential direction, and the seal internal space E2 enters the external space through a gap s2 formed by the outer ring 11 and the inner shaft 12 in close proximity to each other. It is open toward you. Since the outer ring 11 and the inner shaft 12 are close to each other, it is possible to prevent the elastic member 47 from being directly exposed to water when the bearing device 10 is exposed to muddy water or the like.

When painting or the like on the outer peripheral surface in the vicinity of the clearance s2 of the bearing device 10, the painting nozzle 41 and the air nozzle 42 are arranged in the circumferential direction at the position D shown in FIG. Similar to the case of painting the inner surface of the vehicle, when one painting nozzle 41 and seven air nozzles 42 are installed, the painting nozzle 41 and the air nozzle 42 are at 45 ° in the circumferential direction. They are placed at equal intervals, separated from each other.
When painting or the like, the painting nozzle 41 moves in the axial direction and the radial direction along the outer circumferences of the outer ring 11 and the hub flange 17 while injecting air containing a coating agent. Each air nozzle 42 is arranged so as to inject compressed air from the outer side in the radial direction of the outer ring 11 toward the clearance s2.

In this way, also on the outer side of the vehicle, the air nozzle 42 is arranged at a position separated from the painting nozzle 41, and air is injected into the seal internal space E2. Therefore, the air containing the coating agent injected from the coating nozzle 41 cannot flow in the seal internal space E2, so that the air containing the coating agent can be suppressed from flowing into the seal internal space E2.

As described above, according to the manufacturing method of the present embodiment, the air containing the coating agent flows into the seal internal spaces E1 and E2 by a simple method that does not require masking or the like for the sealing devices 21 and 22. It is possible to paint the entire outer periphery of the bearing device 10 while suppressing the above. Further, since the air containing the coating agent does not flow into the seal internal spaces E1 and E2, the coating agent does not enter the bearing internal space K beyond the lip portion 28 or the elastic member 47. Therefore, the rotational performance of the bearing device 10 can be maintained satisfactorily.
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 without departing from the spirit of the present invention.

10: Bearing device, 11: Outer ring, 12: Inner shaft, 12a: Inner ring, 12b: Hub shaft, 13: Ball, 14: Outer raceway surface, 15: Flange, 16a: First inner raceway surface, 16b: Second Inner raceway surface, 17: hub flange, 18: cage, 21: first sealing device, 22: second sealing device, 24: sealing member, 25: metal member, 26: first lip holding part, 27: first 1 Outer ring fitting part, 27a: Convex part, 28: Lip part, 29: Thin film part, 30: Elastic member, 35: Slinger, 36: Flange part, 37: Inner ring fitting part, 38: Encoder, 41: Paint nozzle , 42: Air nozzle, 44: Metal member (second sealing device), 45: Second disk part, 46: Second outer ring fitting part, 47: Elastic member

Claims (4)

An outer member having an outer raceway surface on the inner circumference,
An inner member having an inner raceway surface on the outer circumference,
A plurality of rolling elements arranged between the outer raceway surface and the inner raceway surface,
A method for manufacturing a bearing device in which a sealing device is arranged at an end of a bearing internal space between the outer member and the inner member.
The bearing device has an annular gap formed by the outer member and the inner member in close proximity to each other.
The sealing device has a seal internal space that opens to the annular gap and communicates in the circumferential direction.
A coating step of spraying a coating agent covering the outer surface of the bearing device together with air at at least one of the regions including the gap.
It has an air supply step of supplying air to the seal internal space through the gap at a location separated from the one location.
A method for manufacturing a bearing device, characterized in that the coating process and the air supply process are performed at the same time. The sealing device is
A seal member having a first cylindrical portion fixed to either the outer member or the inner member, and a first disk portion extending in the radial direction from one axial end of the first cylindrical portion.
A slinger having a second cylindrical portion fixed to either the outer member or the inner member, and a second disc portion extending radially from the other end in the axial direction of the second cylindrical portion.
Have,
An annular gap is formed between the first cylindrical portion and the second disk portion.
The method for manufacturing a bearing device according to claim 1, wherein the seal internal space is a space surrounded by the seal member and the slinger. The method for manufacturing a bearing device according to claim 1 or 2, wherein the air pressure for supplying air in the air supply step is equal to or higher than the spray pressure for spraying the coating agent in the coating step. Claims 1 to 3, wherein in the air supply step, air is supplied to a plurality of air supply points in the clearance, and the air supply points are separated from each other in the circumferential direction. The method for manufacturing a bearing device according to any one.

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