WO2022091861A1

WO2022091861A1 - Sealing device

Info

Publication number: WO2022091861A1
Application number: PCT/JP2021/038552
Authority: WO
Inventors: 亮輔野村; 章平山根
Original assignee: Nok株式会社
Priority date: 2020-10-29
Filing date: 2021-10-19
Publication date: 2022-05-05
Also published as: JPWO2022091861A1

Abstract

This sealing device includes an annular sleeve fitted to the outer peripheral surface of a member which co-rotates with an inner race of a bearing, an annular case fitted to the inner peripheral surface of an outer race of the bearing, and an annular seal member fixed to the case. The sleeve has an inner cylinder part contacting the outer peripheral surface of the member, an outer cylinder part along the outer peripheral surface of the inner cylinder part and having a larger diameter than the inner cylinder part, and a plate-shaped wall part connecting mutually adjacent ends of the inner cylinder part and the outer cylinder part. The seal member has at least one first lip, a second lip, a first protruding part, and a second protruding part contacting the outer peripheral surface of the inner cylinder part, and these are integrally formed with an elastic material. Labyrinth gaps are respectively provided between the second lip and the wall surface of the wall part, between the first protruding part and the outer peripheral surface of the inner cylinder part, and between the second protruding part and the outer peripheral surface of the outer cylinder part.

Description

Sealing device

The present invention relates to a sealing device.

Bearings such as rolling bearings are generally provided with a sealing device that seals the space formed between the inner ring and the outer ring of the bearing. The sealing device prevents leakage of a lubricant such as grease enclosed in the space and prevents moisture or foreign matter from entering the space. For example, Patent Document 1 describes a sealing device used for bearings for railway vehicles.

The sealing device described in Patent Document 1 includes a sleeve provided on the outer periphery of a rear lid attached to an axle, a seal outer ring attached to the outer ring of a bearing supporting the axle, and a seal fitted to the inner circumference of the seal outer ring. It has a ring and an elastic seal that fits on the inner circumference of the seal ring.

Here, the elastic seal is a member in which a core metal and an elastic body such as rubber or synthetic resin are integrated. The elastic body of the elastic seal has a lip in contact with the sleeve and a lip in close proximity to the sleeve. Further, the seal outer ring constitutes a labyrinth seal between the seal outer ring and each of the back cover and the sleeve. The seal ring constitutes a labyrinth seal between the seal ring and the sleeve.

Japanese Unexamined Patent Publication No. 9-68232

In the sealing device described in Patent Document 1, it is necessary to assemble a plurality of members of the seal outer ring, the seal ring, and the elastic seal. Improvement is desirable because it requires a lot of man-hours.

In order to solve the above problems, the sealing device according to one aspect of the present invention includes the inner ring and the outer ring of the bearing in which a rolling element is interposed between the inner ring and the outer ring that are relatively rotatable around the axis. An annular sleeve that is fitted to the outer peripheral surface of a member that rotates together with the inner ring, and an annular case that is fitted to the inner peripheral surface of the outer ring, which is a sealing device that seals the space formed between the two. The sleeve has an annular sealing member fixed to the case, and the sleeve has an inner cylinder portion in contact with the outer peripheral surface of the member and an outer peripheral surface of the inner cylinder portion having a diameter larger than that of the inner cylinder portion. It has an outer cylinder portion along the line and a plate-shaped wall portion that connects the inner cylinder portion and the adjacent ends of the outer cylinder portion to each other, and the sealing member comes into contact with the outer peripheral surface of the inner cylinder portion. It has at least one first lip, a second lip, a first protrusion, and a second protrusion, and a labyrinth gap is formed between the second lip and the wall surface of the wall portion. A labyrinth gap is formed between the first protruding portion and the outer peripheral surface of the inner cylinder portion, and a labyrinth gap is formed between the second protruding portion and the outer peripheral surface of the outer cylinder portion. The first lip, the second lip, the first protruding portion, and the second protruding portion are integrally formed of an elastic material.

In the present invention, it is possible to reduce the dimensional variation of the sealing device and reduce the man-hours required for manufacturing the sealing device.

It is sectional drawing of the sealing apparatus which concerns on embodiment. It is a perspective view which shows a part of each of the case of a sealing device and a sealing member. It is a figure which shows the contact state with a sleeve in the part of the 1st lip where there is no protrusion. It is a figure which shows the contact state with the sleeve in the part with the protrusion of the 1st lip. It is a figure which shows the contact state between the 1st lip and a sleeve. It is a figure for demonstrating the usage of the hole provided in a case. It is sectional drawing of the sealing apparatus which concerns on modification 1. FIG.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the accompanying drawings. In the drawings, the dimensions and scale of each part are appropriately different from the actual ones, and some parts are schematically shown for easy understanding. Further, the scope of the present invention is not limited to these forms unless it is stated in the following description that the present invention is particularly limited.

1-1. Sealing device FIG. 1 is a cross-sectional view of the sealing device 10 according to the embodiment. The sealing device 10 is used, for example, in a bearing unit that rotatably supports a shaft such as an axle of a railway vehicle. In the following, the axis of the shaft may be simply referred to as "axis". In addition, the direction along the axis may be referred to as "axial direction". Similarly, the direction along the axis may be referred to as "circumferential direction", and the direction orthogonal to the axis may be referred to as "diametrical direction".

FIG. 1 illustrates a configuration in which a sealing device 10 is arranged between a bearing 110 and a back cover 130 of the bearing unit. Here, the bearing 110 has an inner ring 111, an outer ring 112, a plurality of rolling elements (not shown) arranged between the inner ring 111 and the outer ring 112, and a cage 114 for holding the plurality of rolling elements. .. The rear lid 130 is a member that rotates together with the inner ring 111, and is fitted together with the inner ring 111 on the outer peripheral surface of a shaft (not shown). The bearing 110 may be configured as any of bearings such as ball bearings, roller bearings, needle bearings and spherical roller bearings.

The sealing device 10 seals the space S formed between the inner ring 111 and the outer ring 112. As shown in FIG. 1, the sealing device 10 has a sleeve 11 fixed to the back cover 130, a case 12 fixed to the outer ring 112 of the bearing 110, and a sealing member 13 fixed to the case 12.

The sleeve 11 is fixed to the back cover 130 by being fitted to the outer peripheral surface of the back cover 130. The sleeve 11 is made of a metal material such as carbon steel. The sleeve 11 is formed by, for example, press molding or the like.

In the example shown in FIG. 1, the outer peripheral surface of the back lid 130 has a small diameter portion 131 and a large diameter portion 132 having different diameters from each other. The sleeve 11 is fitted to the small diameter portion 131 having a smaller diameter than the large diameter portion 132. Here, the diameter of the small diameter portion 131 is slightly smaller than the outer diameter of the inner ring 111 described above. The diameter of the large diameter portion 132 is larger than the outer diameter of the inner ring 111. Further, on the outer peripheral surface of the back cover 130, a stepped surface 133 due to the difference in diameter is provided between the small diameter portion 131 and the large diameter portion 132. The step surface 133 is provided with a groove 134 extending along the circumferential direction.

The sleeve 11 has a folded shape as shown in FIG. 1 when viewed in a cross section cut along a plane including an axis. Specifically, the sleeve 11 has a cylindrical inner cylinder portion 11a extending in the axial direction along the small diameter portion 131 and a radial end from both ends of the inner cylinder portion 11a in the axial direction, whichever is far from the bearing 110. It has a plate-shaped wall portion 11b extending outward in the above, and a cylindrical outer cylinder portion 11c extending in a direction approaching the bearing 110 from the outer peripheral edge of the wall portion 11b.

Here, the inner peripheral surface of the inner cylinder portion 11a is fixed to the small diameter portion 131 with a predetermined tightening allowance. The axial length of the inner cylinder portion 11a is longer than the axial length of the outer cylinder portion 11c. The outer diameter of the outer cylinder portion 11c is larger than the outer diameter of the inner cylinder portion 11a. In the example shown in FIG. 1, the outer diameter of the outer cylinder portion 11c is equal to or slightly smaller than the inner diameter of the groove 134 described above. The wall portion 11b has an annular shape, and connects both ends of the inner cylinder portion 11a and the outer cylinder portion 11c in the axial direction, whichever ends are farther from the bearing 110, over the entire circumference.

On the other hand, the case 12 is fixed to the outer ring 112 by being fitted to the inner peripheral surface of the outer ring 112. The case 12 is made of a metal material such as carbon steel. The case 12 is formed, for example, by press molding or the like.

In the example shown in FIG. 1, the inner peripheral surface of the outer ring 112 has a portion 112a parallel to the axial direction. The case 12 is fitted to the portion 112a. Here, the diameter of the portion 112a is larger than the diameter of the large diameter portion 132 of the rear lid 130 described above.

The case 12 has a shape that bends in a staircase shape as shown in FIG. 1 when viewed in a cross section cut along a plane including an axis. Specifically, the case 12 is formed from a cylindrical first cylindrical portion 12a extending axially along the portion 112a and from both ends of the first tubular portion 12a in the axial direction, whichever is closer to the back lid 130. A plate-shaped plate portion 12b extending inward in the radial direction, a tubular second cylinder portion 12c extending in a direction away from the bearing 110 from the inner peripheral edge of the plate portion 12b, and an axial direction of the second cylinder portion 12c. It has a plate-shaped flange portion 12d extending inward in the radial direction from the end farther from the bearing 110 among both ends of the bearing.

Here, the outer peripheral surface of the first tubular portion 12a comes into contact with the portion 112a. Therefore, the outer diameter of the first tubular portion 12a is substantially equal to the diameter of the portion 112a. The axial length of the first tubular portion 12a is about the same as the axial length of the portion 112a. The axial length of the second tubular portion 12c is about the same as the axial length of the first tubular portion 12a. The outer diameter of the second cylinder portion 12c is smaller than the outer diameter of the first cylinder portion 12a. In the example shown in FIG. 1, the outer diameter of the second cylinder portion 12c is larger than the outer diameter of the groove 134 of the rear lid 130 described above. The plate portion 12b has an annular shape, and is formed on the end of the first cylinder portion 12a in the axial direction that is closer to the back cover 130 and the end of the second cylinder portion 12c in the axial direction of the bearing 110. Connect to the closer end over the entire circumference. The flange portion 12d has an annular shape and is connected to the second cylinder portion 12c over the entire circumference. The diameter of the inner peripheral edge of the flange portion 12d is larger than the outer diameter of the inner cylinder portion 11a of the sleeve 11 and smaller than the inner diameter of the groove 134.

In the example shown in FIG. 1, the flange portion 12d is provided with a hole 12d1 that penetrates the flange portion 12d in the axial direction. The hole 12d1, which will be described in detail later with reference to FIG. 6, is used when the case 12 is removed from the outer ring 112. The number of holes 12d1 may be one or two or more. When the number of holes 12d1 is two or more, the two or more holes 12d1 are arranged side by side in the circumferential direction, for example, but the intervals between the holes 12d1 may or may not be equal. ..

The seal member 13 is fixed to the flange portion 12d of the case 12 described above. The sealing member 13 is made of an elastic material such as a rubber material. Examples of the elastic material include rubber materials such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). The seal member 13 is formed by using a molding die. Here, by performing molding with a part of the case 12 (flange portion 12d) arranged in the molding mold, a sealing member 13 in a state of being fixed to the case 12 by vulcanization adhesion or the like can be obtained. A part or all of the sealing member 13 may be made of a resin material such as a fluororesin such as PTFE (PolyTetraFluoroEthylene).

The seal member 13 has a first protruding portion 13a, a first lip 13b, a first lip 13c, a second lip 13d, and a second protruding portion 13e. These are integrally composed of the above-mentioned elastic members.

The first protruding portion 13a projects in the direction toward the bearing 110 from the flange portion 12d of the case 12 described above so as to face the outer peripheral surface of the inner cylinder portion 11a of the sleeve 11. Here, the first protruding portion 13a protrudes from the flange portion 12d in a direction inclined with respect to the radial direction so as to approach the bearing 110. The first protruding portion 13a is non-contact with the sleeve 11 and forms a labyrinth gap between the first protruding portion 13a and the outer peripheral surface of the inner cylinder portion 11a. The labyrinth gap is a gap that can form a labyrinth seal.

The first protruding portion 13a has a surface facing the outer peripheral surface of the inner cylinder portion 11a at a substantially uniform distance. The above-mentioned labyrinth gap is preferably formed by the surface. The thickness t1 of the first protruding portion 13a is such that the gap can be suitably maintained without substantially deforming even if the first protruding portion 13a is subjected to vibration or the like. For example, the thickness t1 is larger than the thickness t3 of the first lip 13b described later.

Each of the first lip 13b and the first lip 13c projects from the inner peripheral edge of the flange portion 12d of the case 12 or its vicinity toward the outer peripheral surface of the inner cylinder portion 11a of the sleeve 11. Here, the first lip 13b is located closer to the bearing 110 than the first lip 13c. The first lip 13b projects in a direction inclined with respect to the radial direction from the inner peripheral edge thereof or its vicinity so as to approach the bearing 110. On the other hand, the first lip 13c projects in a radial direction from the inner peripheral edge thereof or its vicinity so as to be away from the bearing 110. Each of the first lip 13b and the first lip 13c comes into contact with the outer peripheral surface of the inner cylinder portion 11a of the sleeve 11. This contact state will be described in detail later with reference to FIGS. 2 to 5.

The second lip 13d projects from the inner peripheral edge of the flange portion 12d of the case 12 or its vicinity toward the wall portion 11b of the sleeve 11. Here, the second lip 13d is located outward in the radial direction with respect to the above-mentioned first lip 13c. The second lip 13d projects in a direction inclined with respect to the axial direction from the inner peripheral edge thereof or its vicinity so as to be away from the inner cylinder portion 11a of the sleeve 11. The second lip 13d is non-contact with the sleeve 11 and forms a labyrinth gap between the second lip 13d and the wall portion 11b. The second lip 13d may form a labyrinth gap between the second lip 13d and the outer cylinder portion 11c of the sleeve 11.

The second protruding portion 13e protrudes from the flange portion 12d of the case 12 in the direction opposite to the bearing 110 so as to face the stepped surface 133 of the rear lid 130. Here, the second protruding portion 13e is located outward in the radial direction with respect to the above-mentioned second lip 13d. The second protruding portion 13e protrudes radially from the flange portion 12d at a position outward in the radial direction from the outer cylinder portion 11c of the sleeve 11. The tip of the second protrusion 13e is located closer to the back cover 130 than the sleeve 11. The second protruding portion 13e is not in contact with the back lid 130, and forms a labyrinth gap between the second protruding portion 13e and the stepped surface 133. In the example shown in FIG. 1, the tip of the second protrusion 13e enters the groove 134. The second protruding portion 13e forms a labyrinth gap between the second protruding portion 13e and the wall surface of the groove 134. The second protruding portion 13e is not in contact with the sleeve 11. The second protruding portion 13e may form a labyrinth gap between the second protruding portion 13e and the outer peripheral surface of the outer cylinder portion 11c of the sleeve 11.

The second protruding portion 13e has a tapered shape when viewed in a cross section cut along a plane including an axis. However, the shape of the second protruding portion 13e is not limited to the tapered shape. The thickness t2 of the second protruding portion 13e is such that the above-mentioned labyrinth gap can be suitably maintained without substantially deforming even if the second protruding portion 13e is subjected to vibration or the like. For example, the thickness t2 is larger than the thickness t3 of the first lip 13b described above.

1-2. Detailed FIG. 2 of the first lip is a perspective view showing a part of each of the case 12 and the sealing member 13 of the sealing device 10. As shown in FIG. 2, a plurality of protruding portions 13b1 are provided on the first lip 13b of the sealing member 13. The plurality of protrusions 13b1 are arranged at intervals in the circumferential direction. Here, the plurality of protruding portions 13b1 are provided on the surface of the first lip 13b toward the inner cylinder portion 11a of the sleeve 11. Therefore, a gap caused by the plurality of protruding portions 13b1 is intermittently formed between the first lip 13b and the inner cylinder portion 11a in the circumferential direction. The air permeability of the gap reduces the pressure rise in the bearing 110, and as a result, abnormal heat generation due to the pressure rise is prevented. The width, height, arrangement, etc. of the protruding portion 13b1 are appropriately determined according to the required degree of air permeability and the like.

Similarly, the first lip 13c of the seal member 13 is provided with a plurality of protruding portions 13c1. However, the positions of the plurality of protrusions 13c1 in the circumferential direction are different from the positions of the plurality of protrusions 13b1 in the circumferential direction. Therefore, even if a gap is formed due to these protrusions, the sealing performance of the sealing device 10 is suitably exhibited while ensuring the above-mentioned air permeability. It should be noted that the protruding portion 13b1 and the protruding portion 13c1 may or may not overlap when viewed from the axial direction. Hereinafter, the contact state between the first lip 13b and the sleeve 11 will be described. The contact state between the first lip 13c and the sleeve 11 is the same as the contact state between the first lip 13b and the sleeve 11.

FIG. 3 is a diagram showing a contact state with the sleeve 11 in the portion of the first lip 13c without the protruding portion 13c1. FIG. 3 shows a cross section cut along a plane including an axis with respect to the central portion in the circumferential direction of the portion. As shown in FIG. 3, in this portion, the first lip 13c slidably contacts the sleeve 11.

FIG. 4 is a diagram showing a contact state with the sleeve 11 at a portion of the protruding portion 13c1 of the first lip 13c. FIG. 4 shows a cross section of the peripheral end of the portion cut along a plane including an axis. As shown in FIG. 4, in this portion, since the protruding portion 13c1 comes into contact with the sleeve 11, a gap d is formed between the first lip 13c and the sleeve 11.

FIG. 5 is a diagram showing a contact state between the first lip 13c and the sleeve 11. FIG. 5 shows a state in which the tip of the first lip 13c is viewed in the axial direction. As shown in FIG. 5, a plurality of gaps d are intermittently formed in the circumferential direction between the first lip 13c and the sleeve 11. Here, the gap d is formed in each neighboring region in the circumferential direction of each protrusion 13c1.

1-3. How to use the hole 12d1 FIG. 6 is a diagram for explaining how to use the hole 12d1 provided in the case 12. In FIG. 6, a portion near the hole 12d1 of the case 12 is shown in a perspective view. For example, when the sealing device 10 is replaced or the bearing unit is maintained, the sealing device 10 is removed from the bearing unit. Here, the hole 12d1 is used when the case 12 is removed from the bearing 110.

Specifically, first, as shown in FIG. 6, the bent hook-shaped jig 200 is inserted into the hole 12d1. After that, the tip of the jig 200 is hooked on the case 12, and in that state, the jig 200 is pulled in a direction away from the bearing 110, so that the case 12 is removed from the bearing 110. Here, the seal member 13 is removed from the case 12 in advance by an appropriate method. If the hole 12d1 can be exposed by appropriately deforming the seal member 13 using a tool or the like, the seal member 13 may not be removed from the case 12.

As described above, the sealing device 10 is a space formed between the inner ring 111 and the outer ring 112 of the bearing 110 in which a rolling element is interposed between the inner ring 111 and the outer ring 112 that are relatively rotatable around the axis. Seal S. Here, as described above, the sealing device 10 is fitted to the annular sleeve 11 fitted to the outer peripheral surface of the rear lid 130, which is an example of the member rotating together with the inner ring 111, and to the inner peripheral surface of the outer ring 112. It has an annular case 12 and an annular sealing member 13 fixed to the case 12.

As described above, the sleeve 11 has an inner cylinder portion 11a, an outer cylinder portion 11c, and a wall portion 11b. Here, the inner cylinder portion 11a comes into contact with the outer peripheral surface of the back lid 130. The outer cylinder portion 11c has a larger diameter than the inner cylinder portion 11a and follows the outer peripheral surface of the inner cylinder portion 11a. The wall portion 11b has a plate shape that connects one ends of the inner cylinder portion 11a and the outer cylinder portion 11c that are adjacent to each other.

As described above, the sealing member 13 has a

first lip

13b and 13c, a second lip 13d, a first protruding portion 13a, and a second protruding portion 13e, which are integrally composed of an elastic material. Here, each of the

first lips

13b and 13c comes into contact with the outer peripheral surface of the inner cylinder portion 11a. The second lip 13d forms a labyrinth gap between the second lip 13d and the wall surface of the wall portion 11b. The first protruding portion 13a forms a labyrinth gap between the first lip 13b and the outer peripheral surface of the inner cylinder portion 11a. The second protruding portion 13e forms a labyrinth gap between the second protruding portion 13e and the outer peripheral surface of the outer cylinder portion 11c.

In the above sealing device 10, since the sealing member 13 has the first protruding portion 13a and the second protruding portion 13e as well as the first lip 13b, the first lip 13c and the second lip 13d, the first protruding portion 13a or the first 2 The number of parts constituting the sealing device 10 can be reduced as compared with the conventional configuration in which the protruding portion 13e is provided on a member separate from the sealing member 13. Therefore, as compared with the conventional configuration, it is possible to reduce the dimensional variation caused by the accumulation of the tolerances of the parts constituting the sealing device 10. Further, the man-hours required for manufacturing the sealing device 10 can be reduced as compared with the conventional configuration.

Further, as described above, the first lip 13b has a plurality of protruding portions 13b1 that come into contact with the outer peripheral surface of the inner cylinder portion 11a. Therefore, a gap d can be formed between the first lip 13b and the inner cylinder portion 11a. The air permeability of the gap d reduces the pressure rise in the bearing 110, and as a result, abnormal heat generation due to the pressure rise is prevented. Similarly, the first lip 13c has a plurality of protrusions 13c1 that come into contact with the outer peripheral surface of the inner cylinder portion 11a. Therefore, abnormal heat generation due to an increase in pressure in the bearing 110 is suitably prevented.

Here, as described above, the positions of the plurality of protrusions 13b1 and the positions of the plurality of protrusions 13c1 in the circumferential direction around the axis are different from each other. Therefore, even if a gap is formed due to these protrusions, the sealing performance of the sealing device 10 is suitably exhibited while ensuring the above-mentioned air permeability. The first lip 13b and the first lip 13c are two first lips arranged in a direction along the axis. Further, one of the protruding portion 13b1 and the protruding portion 13c1 is a "third protruding portion" provided on one of the two first lips, and the other is the other of the two first lips. It is a "fourth protrusion" provided in.

As described above, the case 12 has a plate-shaped flange portion 12d extending along a radial direction orthogonal to the axis. The seal member 13 is fixed to the flange portion 12d. Therefore, the seal member 13 can be suitably fixed to the case 12.

Here, as described above, the flange portion 12d is provided with a hole 12d1 that penetrates the flange portion 12d along the axis. Therefore, the case 12 can be easily removed from the outer ring 112 of the bearing 110. As a result, the maintainability of the sealing device 10 or the bearing unit can be improved.

Further, as described above, the hole 12d1 is closed by the sealing member 13. Therefore, even if the holes 12d1 are provided, the sealing property at the time of using the sealing device 10 is ensured.

In the present embodiment, the hole 12d1 is closed by the second protrusion 13e. The second protruding portion 13e is thicker in the extending direction of the hole 12d1 than the other portion, and is therefore less likely to be deformed. Therefore, the hole 12d1 can be stably closed.

Further, as described above, the first protruding portion 13a protrudes from the flange portion 12d in the direction toward the bearing 110. Therefore, the rigidity of the first protruding portion 13a can be easily increased as compared with the configuration in which the first protruding portion 13a protrudes from the inner peripheral edge of the flange portion 12d. As a result, a labyrinth gap is stably formed between the first protrusion 13a and the sleeve 11. Further, it is easy to secure an area for arranging the first lip 13b, the first lip 13c and the second lip 13d, and as a result, the degree of freedom in designing these can be increased.

Further, as described above, the second protruding portion 13e protrudes from the flange portion 12d in the direction opposite to the bearing 110. Therefore, the rigidity of the second protruding portion 13e can be easily increased as compared with the configuration in which the second protruding portion 13e is projected from the outer peripheral edge of the flange portion 12d. As a result, a labyrinth gap is stably formed between the second protrusion 13e and the sleeve 11. Further, there is an advantage that the hole 12d1 of the flange portion 12d can be stably closed by the second protruding portion 13e.

Further, as described above, the tip of the second protruding portion 13e is located farther from the bearing 110 than the sleeve 11. Therefore, a labyrinth gap can be formed also between the second protrusion 13e and the back cover 130.

2. 2. Modification Examples Each of the above-exemplified forms can be variously transformed. Specific embodiments that can be applied to each of the above-mentioned embodiments are illustrated below. Two or more embodiments arbitrarily selected from the following examples can be appropriately merged to the extent that they do not contradict each other.

2-1. Modification 1
FIG. 7 is a cross-sectional view of the sealing device 10A according to the first modification. The sealing device 10A is the same as the sealing device 10 of the above-described embodiment except that the sealing member 13A is provided instead of the sealing member 13. The seal member 13A is the same as the seal member 13 except that the seal member 13A has the second protrusion 13f instead of the second protrusion 13e. The second protruding portion 13f is the same as the second protruding portion 13e except that the length in the axial direction is short.

The second protruding portion 13f forms a labyrinth gap between the second protruding portion 13f and the stepped surface 133A of the back cover 130A. The back cover 130A is the same as the back lid 130 of the above-described embodiment except that the back cover 130A has the step surface 133A instead of the step surface 133. The stepped surface 133A is the same as the stepped surface 133 except that the groove 134 is omitted. Also in the above-mentioned modification 1, the dimensional variation of the sealing device 10A can be reduced and the man-hours required for manufacturing the sealing device 10A can be reduced as in the above-described embodiment.

2-2. Modification 2
In the above-described embodiment, the configuration having the first lip 13b and the first lip 13c is exemplified, but the configuration is not limited to this, and for example, one of the first lip 13b and the first lip 13c is omitted. May be good.

2-3. Modification 3
In the above-described embodiment, the configuration having the holes 12d1 is exemplified, but the holes 12d1 may be provided as needed or may be omitted.

2-4. Modification 4
In the above-described embodiment, a configuration having a protrusion 13b1 and a protrusion 13c1 is exemplified, but the configuration is not limited to this, and for example, one of the protrusion 13b1 and the protrusion 13c1 may be omitted.

10 ... Sealing device, 10A ... Sealing device, 11 ... Sleeve, 11a ... Inner cylinder part, 11b ... Wall part, 11c ... Outer cylinder part, 12 ... Case, 12a ... First cylinder part, 12b ... Plate part, 12c ... First 2 cylinder part, 12d ... flange part, 12d1 ... hole, 13 ... seal member, 13A ... seal member, 13a ... first protrusion, 13b ... first lip, 13b1 ... protrusion, 13c ... first lip, 13c1 ... protrusion 13d ... 2nd lip, 13e ... 2nd protrusion, 13f ... 2nd protrusion, 14b ... auxiliary lip, 110 ... bearing, 111 ... inner ring, 112 ... outer ring, 112a ... part, 114 ... cage, 130 ... Back lid, 130A ... lid, 131 ... small diameter part, 132 ... large diameter part, 133 ... step surface, 133A ... step surface, 134 ... groove, 200 ... jig, S ... space, d ... gap, t1 ... thickness, t2 ... thickness, t3 ... thickness.

Claims

A sealing device that seals the space formed between the inner ring and the outer ring of a bearing in which a rolling element is interposed between the inner ring and the outer ring that are relatively rotatable around the axis.
An annular sleeve fitted to the outer peripheral surface of a member that rotates together with the inner ring,
An annular case fitted to the inner peripheral surface of the outer ring and
With an annular sealing member fixed to the case,
The sleeve
The inner cylinder portion that comes into contact with the outer peripheral surface of the member and
An outer cylinder portion having a diameter larger than that of the inner cylinder portion and along the outer peripheral surface of the inner cylinder portion,
It has a plate-shaped wall portion that connects one end of the inner cylinder portion and the outer cylinder portion that are adjacent to each other.
The seal member is
With at least one first lip in contact with the outer peripheral surface of the inner cylinder portion,
With the second lip
The first protrusion and
It has a second protruding portion that forms a labyrinth gap with the outer peripheral surface of the outer cylinder portion.
A labyrinth gap is formed between the second lip and the wall surface of the wall portion.
A labyrinth gap is formed between the first protruding portion and the outer peripheral surface of the inner cylinder portion.
A labyrinth gap is formed between the second protruding portion and the outer peripheral surface of the outer cylinder portion, and the one or more first lip, the second lip, the first protruding portion, and the second protruding portion are formed. Is integrally composed of elastic material,
Sealing device.
Each of the at least one first lip has a plurality of protrusions in contact with the outer peripheral surface of the inner cylinder portion.
The sealing device according to claim 1.
The at least one first lip includes two first lips aligned in a direction along the axis.
The plurality of protrusions
A plurality of third protrusions provided on one of the two first lips,
It has a plurality of fourth protrusions provided on the other of the two first lips.
The positions of the plurality of third protrusions and the positions of the plurality of fourth protrusions in the circumferential direction around the axis are different from each other.
The sealing device according to claim 2.
The case has a plate-shaped flange portion extending along a radial direction orthogonal to the axis.
The sealing member is fixed to the flange portion.
The sealing device according to any one of claims 1 to 3.
The flange portion is provided with a hole that penetrates the flange portion along the axis.
The sealing device according to claim 4.
The hole is closed by the sealing member.
The sealing device according to claim 5.
The hole is closed by the second protrusion.
The sealing device according to claim 6.
The first protruding portion protrudes in the direction from the flange portion toward the bearing.
The sealing device according to any one of claims 4 to 7.
The second protruding portion protrudes from the flange portion in the direction opposite to the bearing.
The sealing device according to any one of claims 4 to 8.
The tip of the second protrusion is located farther from the bearing than the sleeve.
The sealing device according to any one of claims 1 to 9.