JP7015656B2 - Sealing device - Google Patents

Description

The present invention relates to a sealing device that seals the inside of a rolling bearing.

Rolling bearings, such as ball bearings, are well known and are used, for example, in automobile hubs. As a sealing device for sealing the inside of a rolling bearing, there is one described in Patent Document 1. The sealing device comprises an annular body fixed to the outer ring of the rolling bearing, a radial lip extending radially inward from the annular body, and two side lips extending laterally from the annular body. The radial lip has the function of contacting the outer peripheral surface of the inner ring of the bearing or the outer peripheral surface of the component fixed to the inner ring to seal the lubricant inside the bearing, and the two side lips contact the flange of the inner ring. It also has a function of sealing so that foreign matter such as water and dust does not enter the inside of the bearing from the outside.

Japanese Patent No. 3991200

When a large number of sealing devices are stacked in a manufacturing process, a transporting process, or an installation process, it is desirable that the stability is high.

Therefore, the present invention provides a sealing device capable of stably stacking.

The sealing device according to an aspect of the present invention is a sealing device that is arranged between a relatively rotating inner member and an outer member of a rolling bearing and seals a gap between the inner member and the outer member. It has an inner peripheral surface having a central axis, and a cylindrical end of the outer member of the rolling bearing is fitted into the inner peripheral surface, and is in contact with the outer peripheral surface of the end. An annular wall portion extending inward in the radial direction from the cylindrical portion and facing the end surface of the end portion of the outer member, and an annular wall portion extending radially inward from the annular wall portion, the outer member. It comprises an inner annular portion radially inward from the end of the roller and at least one lip extending from the inner annular portion towards the inner member of the rolling bearing, the tubular portion having the annular portion. It has a proximal surface connected to the wall portion and an distal end surface on the opposite side of the annular wall portion, and the proximal end surface and the distal end surface are orthogonal to the central axis and parallel to each other. The inner annular portion does not protrude from the tip surface of the tubular portion in a direction parallel to the central axis.

In this embodiment, the tubular portion of the sealing device has a proximal and distal surfaces parallel to each other. Therefore, it is possible to stably stack a large number of sealing devices by placing the tip end surface of the tubular portion of the sealing device on the base end surface of the tubular portion of another sealing device of the same type. In the above aspect, the cylindrical end of the outer member of the rolling bearing is fitted into the cylindrical portion of the sealing device. Therefore, the tubular portion of the sealing device can be formed so as to have a certain large size, which contributes to stable stacking of the sealing device. Further, the inner annular portion interposed between the tubular portion and the lip does not protrude outward from the tip surface of the tubular portion in the direction parallel to the axis of the rolling bearing. Therefore, when a plurality of sealing devices are stacked, the inner annular portion does not come into contact with other sealing devices, and the stability when the sealing devices are stacked can be improved.

The tubular portion has a flange on the opposite side of the base end surface, and it is preferable that the flange is provided with the tip surface. In this case, the flange having a large area can repel foreign substances such as water (including muddy water or salt water) and dust coming from the outside. Further, it is possible to provide a tip surface having a large area by using a flange, and it is possible to further improve the stability of the stacked sealing devices. In particular, when the thickness of the tubular portion is small, the flange contributes to ensuring a large area of the tip surface in contact with the base end surface of another sealing device. For example, when the sealing device has an elastic ring formed of an elastic body and a reinforcing ring formed of a rigid body that reinforces the elastic ring, and the tubular portion has only one cylinder corresponding to the reinforcing ring. Although the thickness of the tubular portion is small, the flange contributes to ensuring a large area of the tip surface in contact with the base end surface of another sealing device.

When the flange is provided, it is more preferable that the outer peripheral surface of the tubular portion has a tapered surface whose diameter becomes smaller toward the tip surface side. In this case, even if the foreign matter gets over the flange, it is difficult to get over the outer peripheral surface of the tubular portion having the tapered surface and reach the lip. Further, the foreign matter adhering to the tapered surface moves along the tapered surface by an external force such as gravity, separates from the tapered surface, and easily separates from the sealing device.

In this case, it is preferable that the sealing device is further provided with a sealing member fixed to the inner member of the rolling bearing and to which the lip slides, and the sealing member surrounds the outer peripheral surface of the tubular portion. , It is preferable that the flange is not covered. In this case, since the sealing member surrounds the outer peripheral surface of the tubular portion, it is difficult for foreign matter to reach the lip. On the other hand, since the sealing member does not cover the flange, foreign matter that has reached the outer peripheral surface of the tubular portion is likely to pass through the gap between the sealing member and the flange due to an external force such as gravity.

The outer diameter of the base end surface is preferably equal to or larger than the outer diameter of the tip surface. In this case, all or most of the tip surface of the sealing device can be brought into contact with the proximal surface of another sealing device of the same type, further enhancing the stability of the stacked sealing devices.

It is a partial cross-sectional view of an example of a rolling bearing in which the sealing device which concerns on a plurality of embodiments of this invention is used. It is a partial cross-sectional view at the time of use of the sealing apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing at the time of non-use of the sealing device which concerns on 1st Embodiment. It is a partial cross-sectional view at the time of stacking of the sealing apparatus which concerns on 1st Embodiment. It is a partial cross-sectional view at the time of use of the sealing device which concerns on the modification of 1st Embodiment. It is a partial cross-sectional view at the time of use of the sealing device which concerns on other modification of 1st Embodiment. It is a partial cross-sectional view at the time of stacking of the sealing apparatus which concerns on 2nd Embodiment of this invention. It is a partial cross-sectional view at the time of stacking of the sealing apparatus which concerns on the modification of 2nd Embodiment. It is a partial cross-sectional view at the time of stacking of the sealing apparatus which concerns on other modification of 2nd Embodiment. It is sectional drawing at the time of use of the sealing apparatus which concerns on 3rd Embodiment of this invention.

Hereinafter, a plurality of embodiments according to the present invention will be described with reference to the accompanying drawings.
1st Embodiment FIG. 1 shows a hub bearing for an automobile which is an example of a rolling bearing in which the sealing device according to the embodiment of the present invention is used. However, the application of the present invention is not limited to the hub bearing, and the present invention can be applied to other rolling bearings. Further, in the following description, the hub bearing is a ball bearing, but the application of the present invention is not limited to the ball bearing, and other rolling bearings such as roller bearings and needle bearings having other types of rolling elements. The present invention is also applicable. The present invention is also applicable to rolling bearings used in machines other than automobiles.

The hub bearing 1 is arranged outside the hub (inner member) 4 having a hole 2 into which the spindle (not shown) is inserted, the inner ring (inner member) 6 attached to the hub 4, and the outside thereof. An outer ring (outer member) 8, a plurality of balls 10 arranged in a row between the hub 4 and the outer ring 8, and a plurality of balls 12 arranged in a row between the inner ring 6 and the outer ring 8. It has a plurality of cages 14 and 15 for holding the ball in a fixed position.

While the outer ring 8 is fixed, the hub 4 and the inner ring 6 rotate as the spindle rotates.

The common center axis Ax of the spindle and the hub bearing 1 extends in the vertical direction of FIG. In FIG. 1, only the left side portion with respect to the central axis Ax is shown. Although not shown in detail, the upper side of FIG. 1 is the outside (outboard side) where the wheels of the automobile are arranged, and the lower side is the inside (inboard side) where the differential gears and the like are arranged. The outside and the inside shown in FIG. 1 mean the outside and the inside in the radial direction, respectively.

The outer ring 8 of the hub bearing 1 is fixed to the hub knuckle 16. The hub 4 has an outboard side flange 18 projecting radially outward from the outer ring 8. Wheels can be attached to the outboard side flange 18 by means of hub bolts 19.

A sealing device 20 for sealing the gap between the outer ring 8 and the hub 4 is arranged near the end of the outer ring 8 on the outboard side, and inside the end of the outer ring 8 on the inboard side. , A sealing device 21 for sealing the gap between the outer ring 8 and the inner ring 6 is arranged. By the action of these sealing devices 20 and 21, the outflow of grease, that is, the lubricant from the inside of the hub bearing 1 is prevented, and foreign matter (including water (including muddy water or salt water)) from the outside to the inside of the hub bearing 1 is prevented. And the inflow of dust) is prevented. In FIG. 1, the arrow F shows an example of the direction of the flow of foreign matter from the outside.

The sealing device 20 is arranged between the rotating hub 4 of the hub bearing 1 and the fixed outer ring 8, and seals the gap between the hub 4 and the outer ring 8. As shown in FIG. 2, most of the sealing device 20 includes a cylindrical end portion 8A on the outboard side of the outer ring 8 of the hub bearing 1 and an outer peripheral surface 4A in the vicinity of the ball 10 of the hub 4 of the hub bearing 1. , The hub 4 is arranged in a space surrounded by a flange surface 4B extending outward from the outer peripheral surface 4A and an arc surface 4C connecting the outer peripheral surface 4A and the flange surface 4B. The flange surface 4B is the surface of the outboard side flange 18 on the inboard side. Although the sealing device 20 is annular, only the left side portion thereof is shown in FIG.

The sealing device 20 has an elastic body, for example, an elastic ring 22 made of an elastomer, and a rigid body for reinforcing the elastic ring 22, for example, a reinforcing ring 24 made of metal and having a substantially L-shaped cross section. A part of the reinforcing ring 24 is embedded in the elastic ring 22, and is in close contact with the elastic ring 22.

The sealing device 20 has a tubular portion 26, an annular wall portion 28, an inner annular portion 30, a radial lip 32, and two side lips 34, 36.

The tubular portion 26 is a cylindrical portion centered on the central axis Ax (see FIGS. 1 and 3), and the cylindrical end portion 8A of the outer ring 8 is fitted on the inner peripheral surface thereof. The tubular portion 26 is fixed to the end portion 8A. The fixing method is not limited, but may be, for example, a tight fit. That is, the end portion 8A may be press-fitted into the tubular portion 26. The tubular portion 26 is composed of an elastic ring 22 and a reinforcing ring 24, and a portion corresponding to the reinforcing ring 24 has an inner peripheral surface of the tubular portion 26 and is tightly fitted to the outer peripheral surface of the end portion 8A. Contact in a state.

The annular wall portion 28 extends inward in the radial direction from the tubular portion 26 and is orthogonal to the central axis Ax of the hub bearing 1. The annular wall portion 28 is also composed of an elastic ring 22 and a reinforcing ring 24, and a portion corresponding to the reinforcing ring 24 is opposed to the end surface of the end portion 8A of the outer ring 8 and comes into contact with the end surface thereof.

The inner annular portion 30 extends radially inward of the annular wall portion 28 and is arranged radially inward with respect to the end portion 8A of the outer ring 8. In this embodiment, the inner annular portion 30 extends radially inward and diagonally toward the inboard side from the annular wall portion 28. The inner annular portion 30 is also composed of an elastic ring 22 and a reinforcing ring 24.

The radial lip 32 and the side lips 34, 36 are formed only of an elastic body, and are thin plate-shaped annular rings extending from a portion corresponding to the elastic ring 22 of the inner annular portion 30, and the tips thereof are connected to the hub 4. Contact. Since the hub 4 rotates while the sealing device 20 is attached to the fixed outer ring 8, the lips 32, 34, 36 slide with respect to the hub 4.

The radial lip 32 extends from the innermost edge of the inner annular portion 30 and contacts the outer peripheral surface 4A in the vicinity of the ball 10 of the hub 4. The radial lip 32 extends inward in the radial direction and toward the inboard side, and mainly serves to prevent the outflow of the lubricant from the inside of the hub bearing 1.

The side lips 34 and 36 extend laterally (outboard side) and radially outward from the portion of the inner annular portion 30 corresponding to the elastic ring 22. The side lip 34 contacts the flange surface 4B of the hub 4, and the side lip 36 contacts the flange surface 4B or the arc surface 4C. The side lips 34 and 36 mainly play a role of preventing the inflow of foreign matter from the outside into the inside of the hub bearing 1. The side lip 36 has a backup function of blocking foreign matter that has passed through the side lip 34 and has flowed in. Since the side lip 36 exists between the radial lip 32 and the side lip 34, it can also be called an intermediate lip.

FIG. 3 shows the radial lip 32 and the side lips 34, 36 when the sealing device 20 is not arranged on the hub bearing 1. At this time, the radial lip 32 and the side lips 34 and 36 are not subjected to external force and are in a straight state. However, as shown in FIG. 2, when the sealing device 20 is arranged on the hub bearing 1, these lips come into contact with the hub 4 and are deformed by receiving a reaction force.

The tubular portion 26 of the sealing device 20 has a base end surface 38 connected to the annular wall portion 28 and a tip surface 40 on the opposite side of the annular wall portion 28. The base end surface 38 and the tip end surface 40 are orthogonal to the central axis Ax of the hub bearing 1 and are parallel to each other. In this embodiment, the base end surface 38 is flush with the outer surface 28A (the surface opposite to the outer ring 8) on the outboard side of the annular wall portion 28.

FIG. 4 shows a state in which a plurality of sealing devices 20 are stacked on a table St. When a large number of sealing devices 20 are stacked in a manufacturing process, a transporting process, or an installation process, it is desirable that the stability is high. In this embodiment, the tubular portion 26 of the sealing device 20 has a proximal end surface 38 and a tip surface 40 that are orthogonal to the central axis Ax of the hub bearing 1 (that is, the central axis of the sealing device 20) and are parallel to each other. Therefore, it is possible to stably stack a large number of sealing devices 20 by placing the tip surface 40 of the tubular portion 26 of the sealing device 20 on the base end surface 38 of the tubular portion 26 of another sealing device 20 of the same type. It is possible.

In this embodiment, the cylindrical end 8A of the outer ring 8 of the hub bearing 1 is fitted into the cylindrical portion 26 of the sealing device 20. Therefore, the tubular portion 26 of the sealing device 20 can be formed so as to have a certain large size. That is, it is possible to increase the area of the base end surface 38 and the tip end surface 40 of the tubular portion 26. This improves the stability when the sealing devices 20 are stacked.

The inner annular portion 30 interposed between the tubular portion 26 and the lips 32, 34, 36 is in the space between the outer surface 28A on the outboard side of the annular wall portion 28 and the tip surface 40 of the tubular portion 26. It exists in and does not protrude out of the space. That is, the inner annular portion 30 does not protrude outward from the tip surface 40 of the tubular portion 26 in the direction parallel to the central axis Ax of the hub bearing 1. Therefore, when a plurality of sealing devices 20 are stacked, the inner annular portion 30 does not come into contact with other sealing devices, and the stability when the sealing devices 20 are stacked can be improved. On the other hand, if the inner annular portion 30 has a portion protruding below the tip surface 40 in the drawing, that portion is a portion of another sealing device 20 (for example, directly below the sealing device 20). It may come into contact with the side lip 34 or the inner annular portion 30), and the stability during stacking may be impaired.

The length, orientation and position of each of the lips 32, 34, 36 are designed so that the lips 32, 34, 36 do not come into contact with the other sealing device 20. In short, when a plurality of sealing devices 20 are stacked, the tip surface 40 of the tubular portion 26 of the sealing device 20 and the base end surface 38 of the tubular portion 26 of the other sealing device 20 are in contact with each other, and the other portions are in contact with each other. It is considered not to.

Grease G may be applied to the radial inner surfaces 32A, 34A, 36A of the lips 32, 34, 36. In this case, the length, orientation and position of each of the lips 32, 34, 36 are taken into consideration so that the grease G on the surfaces 32A, 34A, 36A does not come into contact with the other sealing device 20. It is preferable to design.

In this embodiment, the sealing device 20 is formed by fixing the elastic ring 22 to the substantially L-shaped reinforcing ring 24. Therefore, the shape of the sealing device 20 is simple and its manufacturing is easy.

Although not essential, in this embodiment, the tubular portion 26 has a flange 41 on the opposite side of the base end surface 38, and the flange 41 is provided with a tip surface 40. Therefore, it is possible to provide the tip surface 40 having a large area by using the flange 41, and it is possible to improve the stability of the stacked sealing devices 20. In this embodiment, since the tubular portion 26 has only one cylinder corresponding to the reinforcing ring 24, the thickness of the tubular portion 26 other than the flange 41 is small, but the flange 41 is the sealing device 20 of the other. A wide area of the tip surface 40 in contact with the base end surface 38 can be secured. However, the tubular portion 26 may have two concentric cylinders formed by the reinforcing ring 24 and overlapping in the radial direction.

Further, in this embodiment, the flange 41 having a large area can repel most of the foreign matter arriving from the outside (in FIG. 2, an example of the direction of the flow of the foreign matter from the outside is indicated by an arrow F). The inner peripheral surface of the flange 41 comes into contact with the outer peripheral surface of the end portion 8A of the outer ring 8 in a tightly fitted state.

Although not indispensable, in this embodiment, the entire outer peripheral surface of the portion of the tubular portion 26 other than the flange 41 is a tapered surface 42 whose diameter becomes smaller toward the tip surface 40 side. Therefore, even if the foreign matter gets over the flange 41, it is difficult to get over the outer peripheral surface (tapered surface 42) of the tubular portion 26 and reach the side lip 34. Further, the foreign matter adhering to the tapered surface 42 falls along the tapered surface 42 due to gravity and further separates from the tapered surface 42, so that it is easy to separate from the sealing device 20.

In this embodiment, the entire outer peripheral surface of the portion of the tubular portion 26 excluding the flange 41 is the tapered surface 42. However, as shown in FIGS. 5 and 6, a part of the outer peripheral surface of the portion of the tubular portion 26 other than the flange 41 may be a tapered surface. In the modified example shown in FIG. 5, the outer peripheral surface of the tubular portion 26 excluding the flange 41 is composed of a tapered surface 44 and a cylindrical surface 46, the tapered surface 44 is arranged in the vicinity of the flange 41, and the cylindrical surface 46 is the base end surface 38. It is located in the vicinity of. In the modified example shown in FIG. 6, the outer peripheral surface of the tubular portion 26 excluding the flange 41 is composed of a tapered surface 48 and a cylindrical surface 50, the cylindrical surface 50 is arranged in the vicinity of the flange 41, and the tapered surface 48 is the base end surface 38. It is located in the vicinity of. Even in these modifications, even if the foreign matter gets over the flange 41, it is difficult to get over the outer peripheral surface of the tubular portion 26 having the tapered surface 44 or 48 and reach the side lip 34. Further, the foreign matter adhering to the tapered surface 44 or 48 falls along the tapered surface 44 or 48 due to gravity and further separates from the tapered surface 42, so that it is easy to separate from the sealing device 20.

The second embodiment FIG. 7 is a partial cross-sectional view of the sealing device 20 according to the second embodiment of the present invention when they are stacked. In the drawings after FIG. 7, the same reference numerals are used to show the components common to the first embodiment, and these components will not be described in detail.

As shown in FIG. 7, in the second embodiment, the outer diameter D1 of the base end surface 38 of the tubular portion 26 is equal to or larger than the outer diameter D2 of the tip surface 40. Therefore, all of the tip surfaces 40 of the sealing device 20 can be brought into contact with the base end surface 38 of another sealing device 20 of the same type, and the stability of the stacked sealing devices 20 can be further enhanced.

Further, in this embodiment, the convex portion 52 is formed on the surface of the annular wall portion 28 on the outboard side. The convex portion 52 has a flat surface, and a step is provided between the flat surface and the base end surface 38 of the tubular portion 26. The flat surface of the convex portion 52 and the proximal end surface 38 are parallel to each other. The outer diameter D3 of the convex portion including the surface 52 is slightly smaller than the inner diameter D4 of the tip surface 40 (that is, the inner diameter of the flange 41). Since the convex portion 52 protruding from the proximal end surface 38 is provided inside the proximal end surface 38 on which the distal end surface 40 of the other sealing device 20 is placed, the radial movement of the stacked sealing apparatus 20 is provided. (That is, horizontal movement) is suppressed. Therefore, the stability of the stacked sealing devices 20 can be further improved. Even if a large number of sealing devices 20 are stacked, there is little possibility that the stacking will be broken.

8 and 9 are partial cross-sectional views of the sealing device 20 according to the modified example of the second embodiment when they are stacked. In the modified example shown in FIG. 8, the convex portion 52 has a larger outer diameter than the convex portion 52 of FIG. 7, and the convex portion 52 of another sealing device 20 is formed at the inner peripheral corner portion of the flange 41. A recess 54 is formed to receive the outer peripheral edge of the. In the modified example shown in FIG. 9, a convex portion 56 is formed on the base end surface 38, a concave portion 58 is formed on the tip end surface 40, and the convex portion 56 of another sealing device 20 is fitted into the concave portion 58. In any of the modifications, the radial movement (that is, the horizontal movement) of the stacked sealing devices 20 is suppressed, and the stability of the stacked sealing devices 20 can be further enhanced. Even if a large number of sealing devices 20 are stacked, there is little possibility that the stacking will be broken. Contrary to the modification shown in FIG. 9, a concave portion may be formed on the base end surface 38 and a convex portion may be formed on the tip end surface 40.

Third Embodiment FIG. 10 is a cross-sectional view when the sealing device 20 according to the third embodiment of the present invention is used. This sealing device 20 is used together with a sealing member 60 which is another sealing device.

The seal member 60 is fixed to the hub 4 and rotates together with the hub 4. The sealing member 60 has a cylindrical portion 61, an arc portion 62, an annular portion 64, and a cylindrical portion 66. The cylindrical portion 61 is in contact with the outer peripheral surface 4A of the hub 4, and the arc portion 62 is connected to the end portion of the cylindrical portion 61 and is in contact with the arc surface 4C of the hub 4. The annular portion 64 is connected to the outer edge of the arc portion 62 and comes into contact with the flange surface 4B of the hub 4. The cylindrical portion 66 is connected to the outer edge of the annular portion 64.

The sealing device 20 is used by being assembled to the sealing member 60. Specifically, most of the sealing device 20 is arranged in the space defined by the cylindrical portion 61, the arc portion 62, the annular portion 64, and the cylindrical portion 66. In the assembled state, the radial lip 32 of the sealing device 20 contacts the cylindrical portion 61, the side lip 34 contacts the annular portion 64, and the side lip 36 contacts the arc portion 62 or the annular portion 64. The radial lip 32 mainly plays a role of preventing the outflow of the lubricant from the inside of the hub bearing 1. The side lips 34 and 36 mainly play a role of preventing the inflow of foreign matter from the outside into the inside of the hub bearing 1. While the sealing device 20 is attached to the fixed outer ring 8, the sealing member 60 rotates with the hub 4, so that the lips 32, 34, 36 slide with respect to the sealing member 60.

Therefore, the sealing device 20 and the sealing member 60 can be considered to constitute one sealing assembly. From a different point of view, the sealing member 60 can be considered as a component of the sealing device 20.

The sealing device 20 before being assembled to the sealing member 60 is the same as the sealing device 20 of the first embodiment. Therefore, for example, in the manufacturing process, it is possible to stack a plurality of sealing devices 20 as described above with reference to FIG.

The seal member 60 is a rotating member and functions as a slinger that repels foreign matter. An example of the direction of the flow of foreign matter is shown by arrow F. Most of the foreign matter arriving from the outside is blocked by the cylindrical portion 66 of the sealing member 60 and the flange 41 of the sealing device 20. The cylindrical portion 66 of the sealing member 60 surrounds the outer peripheral surface of the tubular portion 26 of the sealing device 20. Therefore, it is difficult for foreign matter to reach the side lip 34.

However, the seal member 60 does not cover the flange 41. More precisely, the cylindrical portion 66 of the sealing member 60 does not overlap the flange 41 in the direction parallel to the central axis Ax of the sealing device 20. Therefore, there is a gap 68 between the end of the cylindrical portion 66 and the outer end of the flange 41. Since the gap 68 is minute, it is difficult for foreign matter to pass through the gap 68 from the outside. Even if it passes through the gap 68, it is difficult for the foreign matter to get over the tapered surface 42 on the outer peripheral surface of the tubular portion 26 and reach the side lip 34.

Further, the foreign matter that has passed through the gap 68 and reached the outer peripheral surface of the tubular portion 26 falls along the outer peripheral surface of the tubular portion 26 by gravity as shown by the arrow F of the broken line in the figure, and the foreign matter reaches the gap 68. It is discharged through the lower part of the.

Although not essential, the cylindrical portion 66 of the seal member 60 is formed in a tapered shape having a smaller diameter toward the outboard side. That is, the diameter of the cylindrical portion 66 is larger toward the open end side. Therefore, the foreign matter that has fallen on the inner peripheral surface of the lower portion of the cylindrical portion 66 falls along the inner peripheral surface due to gravity, and is discharged through the gap 68.

Other Modifications Although the embodiments of the present invention have been described above, the above description does not limit the present invention, and various modifications including deletion, addition, and replacement of components are included in the technical scope of the present invention. An example is possible.

For example, the above embodiments and modifications may be combined as long as they do not conflict with each other.

The shape and number of lips of the sealing device 20 are not limited to those described above.

In the above embodiment, the hub 4 which is an inner member is a rotating member, and the outer ring 8 which is an outer member is a stationary member. However, the present invention is not limited to the above embodiment, and can be applied to sealing a plurality of members that rotate relative to each other. For example, the inner member may be stationary and the outer member may rotate, or all of these members may rotate.

1 Hub bearing (rolling bearing)
Ax center axis 2 holes 4 hubs (inner member)
8 outer ring (outer member)
8A Ends 10, 12 Balls 20 Sealing device 22 Elastic ring 24 Reinforcing ring 26 Cylindrical part 28 Circular wall part 28A Outer surface 30 Inner annular part 32 Radial lip 34, 36 Side lip 38 Base end surface 40 Tip surface 41 Flange 42, 44, 48 Tapered surface 52, 56 Convex part 54, 58 Concave part 60 Sealing member 61 Cylindrical part 62 Arc part 64 Circular part 66 Cylindrical part 68 Gap

Claims (3)

A sealing device that is arranged between a relatively rotating inner member and an outer member of a rolling bearing and seals a gap between the inner member and the outer member.
It has an inner peripheral surface having a central axis, and a cylindrical end of the outer member of the rolling bearing is fitted into the inner peripheral surface, and a cylindrical portion that contacts the outer peripheral surface of the end portion.
An annular wall portion extending inward in the radial direction from the tubular portion and facing the end surface of the end portion of the outer member, and an annular wall portion.
An inner annular portion extending inward in the radial direction of the annular wall portion and arranged radially inward from the end portion of the outer member, and an inner annular portion.
With at least one lip extending from the inner annular portion towards the inner member of the rolling bearing.
The tubular portion has a base end surface connected to the annular wall portion, a flange on the opposite side of the annular wall portion, and a tip surface provided on the flange, and the base end surface and the tip end surface. The planes are orthogonal to the central axis and parallel to each other.
The outer peripheral surface of the tubular portion has a tapered surface whose diameter becomes smaller toward the tip surface side.
The inner annular portion does not protrude from the tip surface of the tubular portion in a direction parallel to the central axis.
When a plurality of sealing devices of the same type are stacked, the tip surface of the tubular portion of the upper sealing device comes into contact with the base end surface of the tubular portion of the lower sealing device, and the inside of each sealing device. Parts other than the annular part and the tubular part including the lip do not come into contact with other sealing devices.
A sealing device characterized by that. Further provided with a sealing member fixed to the inner member of the rolling bearing and to which the lip slides.
The sealing device according to claim 1 , wherein the sealing member surrounds an outer peripheral surface of the tubular portion and does not cover the flange. The sealing device according to claim 1 or 2 , wherein the outer diameter of the base end surface is equal to or larger than the outer diameter of the tip surface.

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