JP2022015284A - Sealing device - Google Patents

Abstract

To provide a sealing device which achieves low torque of a rotary side member and can inhibit wear of a lip part.SOLUTION: A sealing device 10 is attached to a first member of one of an inner member 4 and an outer member 2 which are coaxially rotated relative to each other, where a lip part 15 of an elastic member 14 fastened to an annular core member 11 contacts with a side surface 5b of a seal groove 5 provided at a second member of the other of the inner member and the outer member. The lip part includes: a base end side piece part 16 extending from a second member side end part of the core member to the side surface of the seal groove; a tip side piece part 17 provided in a bending form relative to the base end side piece part and extending from a tip part of the base end side piece part along the side surface of the seal groove; and a protrusion part 18 which is provided so as to protrude from a tip part of the tip side piece part to the side surface of the seal groove and contacts with the side surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device.

Conventionally, a sealing device mounted on a bearing device having an inner member and an outer member that are relatively coaxially rotated has been known. As such a sealing device, there is known a structure in which a lip portion made of an elastic member is provided on a core metal mounted on one member, and the lip portion is elastically brought into contact with the other member. ..
For example, in Patent Document 1 below, an annular core metal is attached to a seal member that is fitted and fixed to the inner peripheral surface of the outer ring, and Takama that is fixed to the core metal and is in contact with the inner surface of the seal groove of the inner ring. An elastic member having a seal lip portion made of a wear material and a rolling bearing provided with the elastic member are disclosed.

Japanese Unexamined Patent Publication No. 2011-127702

However, in the rolling bearing described in Patent Document 1, a strong contact force is applied until the tip portion of the seal lip portion is worn, and the torque of the rotating side member tends to increase, and the torque of the seal lip portion tends to increase. There is a concern that wear debris will be generated due to wear of the tip portion, and further improvement is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealing device capable of reducing the torque of a member on the rotating side and suppressing wear of a lip portion.

In order to achieve the above object, the sealing device according to the present invention is an elastic member attached to the first member of one of an inner member and an outer member that are relatively coaxially rotated and fixed to an annular core member. Is a sealing device in which the lip portion of the inner member and the outer member of the outer member come into contact with the side surface of the seal groove provided on the other second member, and the lip portion is a side end of the second member of the core member. A base end side piece extending from the portion toward the side surface of the seal groove, and a bent shape with respect to the base end side piece portion from the tip end portion of the base end side piece portion to the side surface of the seal groove. It is provided with a tip-side piece extending along the tip side and a protrusion provided so as to project from the tip end portion of the tip-side piece toward the side surface of the seal groove and come into contact with the side surface. It is a feature.

The sealing device according to the present invention has the above-mentioned configuration, so that the torque of the rotating side member can be reduced and the wear of the lip portion can be suppressed.

(A) and (b) schematically show an example of a sealing device according to an embodiment of the present invention and an example of a bearing device incorporating this sealing device, and (a) is a partially broken schematic vertical cross section. FIG. 1B is a schematic vertical cross-sectional view of a partially broken portion in which a part corresponding to the X portion in (a) is omitted. (A) schematically shows the natural state of the lip portion included in the sealing device, and the partially broken schematic vertical cross-sectional view corresponding to FIG. 1 (b), (b) and (c) are the sealing device. Each of the modified examples of the above is schematically shown, and is a schematic vertical cross-sectional view of a partial fracture corresponding to (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In some figures, some of the detailed reference numerals attached to other figures are omitted.
1 and 2A are diagrams schematically showing an example of a sealing device according to the present embodiment and an example of a bearing device in which the sealing device is incorporated.

The sealing device 10 according to the present embodiment is attached to the first member of one of the inner member 4 and the outer member 2 that are relatively coaxially rotated.
FIG. 1A shows an example in which the sealing device 10 is incorporated in a bearing device 1 including an outer member 2 constituting the outer ring and an inner member 4 constituting the inner ring.
The bearing device 1 is configured such that, for example, the outer member 2 is fitted into a housing or the like, the shaft 9 is inserted through the inner member 4, and the inner member 4 is rotated with respect to the outer member 2 together with the shaft 9. Further, the bearing device 1 is a rolling bearing device in which a rolling element (ball in the figure) 6 is interposed between the outer member 2 and the inner member 4. The bearing device 1 supports a shaft 9 of a transmission of various vehicles such as automobiles.
A sealed space 8 is formed in an annular shape between the outer member 2 and the inner member 4 over the entire circumference.

In the sealed space 8, the raceway ring 2a of the outer member 2 and the raceway ring 4a of the inner member 4 are rotatably interposed in a state where the rolling element 6 in a single row is held by the retainer (retainer) 7. ing. The sealed space 8 is appropriately filled with grease. In the illustrated example, as the bearing device 1, a deep groove ball bearing in which groove-shaped raceway rings 2a and 4a are provided on the outer member 2 and the inner member 4 is exemplified.

As shown in FIG. 1A, the sealing devices 10 and 10 sandwich the sealed space 8 between the outer member 2 and the inner member 4, respectively, on both sides in the axial direction in the sealed space 8. It is attached to. The sealed space 8 is sealed by the sealing devices 10 and 10 on both sides in the axial direction, and the intrusion of foreign matter and the like into the sealed space 8 and the leakage of grease filled in the sealed space 8 to the outside are suppressed. .. Since the sealing devices 10 and 10 provided on both sides in the axial direction have the same configuration as each other, one of the sealing devices 10 will be described below as an example. Further, the bearing device 1 in which the sealing device 10 is incorporated is not limited to the one having the above-mentioned configuration, and may have various other configurations.

The sealing device 10 includes an annular core member 11 and an elastic member 14 fixed to the core member 11. The elastic member 14 includes a lip portion 15 that comes into contact with the side surface 5b of the seal groove 5 provided in the other second member of the inner member 4 and the outer member 2. In the present embodiment, the sealing device 10 is attached to the outer member 2 as the first member, and the lip portion 15 comes into contact with the side surface 5b of the seal groove 5 of the inner member 4 as the second member. The lip portion 15 is provided on the inner diameter (axis center) side, which is one side in the radial direction of the sealing device 10.

The sealing device 10 is formed in an annular shape concentric with the shaft 9. The core member 11 of the sealing device 10 is an annular body formed of a metal material such as a stainless steel plate or a cold rolled steel plate (SPCC).
The core member 11 is connected to a cylindrical portion 12 extending along the axial direction and an axial one (external space) side end portion of the cylindrical portion 12, and a disk portion extending from the end portion toward the inner diameter side. It is equipped with 13. In the illustrated example, the inner peripheral surface 3a of the outer member 2 is the step bottom surface of the concave step portion 3 formed in a diameter larger than the inner peripheral surface on the other side (sealed space 8) in the axial direction.

The elastic member 14 is made of a rubber material (elastic material) and is fixed and integrated with the core member 11 over the entire circumference.
The elastic member 14 is provided so as to cover the outer peripheral surface of the cylindrical portion 12 of the core member 11 and the outer surface of the disk portion 13 of the core member 11. Further, the elastic member 14 is provided so as to cover the end surface of the cylindrical portion 12 on the other side (sealed space 8) in the axial direction. The cylindrical portion 12 of the core member 11 is fitted (innerly fitted) to the inner peripheral surface 3a of the outer member 2 via the elastic member 14. Further, when the sealing device 10 is attached to the outer member 2, the portion of the elastic member 14 covering the end surface of the cylindrical portion 12 on the sealed space 8 side comes into contact with one side surface of the concave step portion 3 of the outer member 2. One side surface of the concave step portion 3 of the outer member 2 is a surface facing the external space side.

Further, in the illustrated example, with the sealing device 10 mounted on the outer member 2, the surface of the sealing device 10 facing the outer space side and the end surface of the outer member 2 and the inner member 4 facing the outer space side are substantially the same plane. An example of the configuration is shown.
Further, the elastic member 14 is provided so as to cover the axial center side end surface of the inner diameter side end portion 13a of the disk portion 13 of the core member 11 and the side surface of the sealed space 8. The elastic member 14 is provided with a series of lip portions 15 at a portion of the disc portion 13 that covers the inner diameter side end portion 13a.

The lip portion 15 includes a base end side piece portion 16 extending from the inner diameter side end portion 13a of the disk portion 13 toward the side surface 5b of the seal groove 5 provided on the inner member 4. Further, the lip portion 15 is provided so as to be bent with respect to the proximal end side piece portion 16 and extends from the distal end portion of the proximal end side piece 16 along the side surface 5b of the seal groove 5. I have. Further, the lip portion 15 is provided so as to project from the tip end portion of the tip end side piece portion 17 toward the side surface 5b of the seal groove 5, and includes a protrusion 18 that comes into contact with the side surface 5b. With such a configuration, the lip portion 15 can be configured by the proximal end side piece portion 16 and the distal end side piece portion 17 provided in a bent shape with respect to the proximal end side piece portion 16. Therefore, the dimension of the lip portion 15 along the extending direction can be increased as compared with the lip portion formed only by the portion extending toward the side surface 5b of the seal groove 5. As a result, the bent portion 15a is provided at the boundary between the base end side piece portion 16 and the tip end side piece portion 17, and the lip portion 15 is easily bent. Therefore, the reaction force (tightening force) received by the lip portion 15 can be reduced, and the torque of the rotating side member (inner member 4 in the present embodiment) can be reduced. Further, this makes it possible to suppress the wear of the protrusion 18 that comes into contact with the side surface 5b of the seal groove 5.

In the present embodiment, as shown in FIG. 2A, the tip end side piece 17 is parallel to the side surface 5b of the seal groove 5 in a natural state (a state in which the lip portion 15 is not elastically deformed). It is provided. With such a configuration, in the natural state of the lip portion 15, the distal end side piece 17 extends diagonally toward the side surface 5b of the seal groove 5 as it extends from the distal end portion of the proximal end side piece 16. In comparison, the reaction force of the lip portion 15 can be effectively reduced. Further, the gap between the tip end side piece 17 and the side surface 5b of the seal groove 5 does not become large on the bent portion 15a side, and the region where the tip end side piece 17 is close to the side surface 5b of the seal groove 5 can be expanded. It is possible to improve the sealing property.

Further, in the present embodiment, the base end side piece portion 16 is provided so as to extend diagonally toward the sealed space 8 side, which is the side surface 5b side of the seal groove 5. In other words, the base end side piece 16 extends so as to intersect the axial direction and the radial direction while facing the sealed space 8 side. Further, the tip end side piece 17 is provided so as to extend diagonally toward the external space side opposite to the base end side piece 16. In other words, the tip side piece 17 extends so as to intersect in the axial direction and the radial direction while facing the external space side. With such a configuration, the base end side piece 16 extends in the axial direction and the tip end side piece 17 extends in the radial direction, which is easier to bend and the reaction force of the lip portion 15 is effective. Can be reduced.
Further, in the present embodiment, the thickness dimension T1 of the base end side piece portion 16 is larger than the thickness dimension T2 of the tip end side piece portion 17. Then, the bent portion 15a with the tip end side piece portion 17 is brought close to the side surface 5b of the seal groove 5 to form a non-contact seal portion S that suppresses leakage of the lubricant. With such a configuration, the thickness dimension T1 of the base end side piece 16 is made larger than the thickness dimension T2 of the tip end side piece 17 so that it is less likely to bend than the tip end side piece 17, and the bent portion 15a thereof. Can function as a non-contact seal portion S by bringing it close to the side surface 5b of the seal groove 5. As a result, it is possible to suppress the leakage of the lubricant while saving the space for arranging the lip portion 15 as compared with the case where the grease lip is separately provided.

Further, in the present embodiment, the dimension (extension dimension) L2 along the extension direction of the tip end side piece 17 is formed larger than the dimension (extension dimension) L1 along the extension direction of the proximal end side piece 16. Has been done. With such a configuration, the tip end side piece 17 is more likely to bend, and the reaction force of the lip portion 15 can be effectively reduced. Hereinafter, an example of a specific configuration of the lip portion 15 and the seal groove 5 will be described.
The seal groove 5 of the inner member 4 is formed as an annular concave step portion open to the outer diameter side and the outer space side. The seal groove 5 is partitioned by a groove peripheral surface 5a forming a step peripheral surface facing outward in the radial direction and a side surface 5b forming a step wall surface facing the external space side. The groove peripheral surface 5a of the seal groove 5 is an outer peripheral surface of a cylinder coaxial with the shaft 9. Further, the side surface 5b of the seal groove 5 is formed as a tapered inclined surface whose diameter increases toward the sealed space 8 side. In the illustrated example, an example is shown in which the angle formed by the groove peripheral surface 5a and the side surface 5b is about 115 degrees in the radial cross section (cross section cut along the radial direction), but the angle is limited to such an angle. However, the temperature may be about 95 to 130 degrees.

The base end side piece portion 16 is formed in a truncated cone shape whose diameter is reduced from the inner diameter side end portion 13a of the disk portion 13 of the core member 11 toward the sealed space 8 side. In the illustrated example, an example is shown in which the angle between the base end side piece portion 16 and the disk portion 13 of the core member 11 is about 135 degrees in a radial cross-sectional view, but it is about 120 degrees to 150 degrees. There may be.
The bent portion 15a, which is the tip end portion in the extending direction of the base end side piece portion 16, is close to the side surface 5b of the seal groove 5, and constitutes a non-contact seal portion S with the side surface 5b of the seal groove 5. A gap is formed. In the illustrated example, the bent portion 15a is provided so as to be positioned substantially on the same plane as the outer peripheral surface of the inner member 4 connected to the sealed space 8 side of the seal groove 5.

In the figure, the extension dimension L1 of the base end side piece portion 16 is a dimension along the extension direction from the inner diameter side end portion 13a of the disk portion 13 of the core member 11 to the substantially center in the thickness direction of the bending portion 15a. Is. In the extension dimension L1 of the base end side piece portion 16, the bent portion 15a is in a non-contact state with respect to the side surface 5b of the seal groove 5, and a gap forming the non-contact seal portion S is formed between the bent portion 15a and the side surface 5b. Dimensions.
Further, the base end side piece portion 16 is formed so that the thickness dimension T1 becomes smaller toward the bent portion 15a. That is, the base end side piece portion 16 is formed so that the thickness dimension T1 on the bent portion 15a side is smaller than the thickness dimension T1 of the disk portion 13 side portion of the base end side piece portion 16. The thickness dimension of the tip end side piece 17 (thickness dimension of the portion where the protrusion 18 is not provided) T2 is smaller than the bending portion 15a side portion where the thickness dimension T1 of the base end side piece portion 16 is the smallest. It is formed. In the illustrated example, the thickness dimension T2 of the tip end side piece 17 is set to about ½ of the thickness dimension T1 of the bent portion 15a side portion of the base end side piece 16. It is not limited to this example.

In the present embodiment, the tip end side piece 17 is provided in parallel with the side surface 5b of the seal groove 5 which is an inclined surface in a natural state, as shown in FIG. 2 (a). With such a configuration, even if the distance between the side surface 5b of the seal groove 5 and the tip side piece 17 becomes small due to the tolerance of the seal groove 5 and the lip portion 15, the lip portion 15 tends to bend, so that the seal is sealed. It is possible to prevent the protrusion 18 from being excessively pressed against the side surface 5b of the groove 5.
The tip side piece portion 17 is formed in a truncated cone shape whose diameter decreases toward the external space side from the bent portion 15a. Further, the tip side piece portion 17 is formed so that the surface of the seal groove 5 facing the side surface 5b is parallel to the side surface 5b in a natural state. In the illustrated example, an example is shown in which both sides of the tip end side piece 17 in the thickness direction are parallel to the side surface 5b of the seal groove 5 in a natural state. The parallelism between the tip end side piece 17 and the side surface 5b of the seal groove 5 in the natural state is not limited to those that are completely parallel, and may be substantially parallel. For example, the angle between the tip side piece 17 and the side surface 5b may be set to about 15 degrees or less.

Further, in the illustrated example, in the radial cross-sectional view of the lip portion 15 in the natural state, the angle formed by the tip end side piece portion 17 and the proximal end side piece portion 16 is smaller than 180 degrees, specifically, 110 degrees. An example of the degree is shown, but it may be about 80 to 140 degrees.
Further, in the figure, the extension dimension L2 of the tip side piece portion 17 is a dimension along the extension direction from the substantially center in the thickness direction of the bent portion 15a to the extension direction tip of the tip end side piece portion 17. .. In the illustrated example, an example is shown in which the extension dimension L2 of the tip end side piece 17 is about twice the extension dimension L1 of the base end side piece 16.
Further, the thickness dimension T2 of the tip side piece portion 17 has a substantially uniform thickness from the bent portion 15a to the portion where the protrusion 18 is provided.

The protrusion 18 is provided at the tip of the tip 17 and projects toward the sealed space 8. More specifically, the protrusion 18 is provided on the surface of the tip end side piece 17 on the sealed space 8 side, and faces the side surface 5b of the seal groove 5. As shown in FIG. 1B, the protrusion 18 is brought into contact with the side surface 5b of the seal groove 5 with elastic deformation of the lip portion 15. In the illustrated example, the protrusion 18 is formed in a tapered shape toward the tip in a radial cross-sectional view. The tip of the protrusion 18 is brought into contact with the side surface 5b of the seal groove 5 with its elastic deformation. That is, the tip end side of the protrusion 18 is crushed in a state of being in contact with the side surface 5b of the seal groove 5. Further, the above-mentioned tip side piece portion 17 is substantially parallel to the side surface 5b even when the protrusion 18 is in contact with the side surface 5b of the seal groove 5. Further, in the bent portion 15a, a gap forming the non-contact seal portion S is formed between the bent portion 15a and the side surface 5b even when the protrusion 18 is in contact with the side surface 5b of the seal groove 5 due to the elastic deformation of the lip portion 15. It is provided so that it can be done. The protrusion 18 is provided over the entire circumference.

Next, a modification of the sealing device according to the present embodiment and the bearing device into which the sealing device is incorporated will be described.
In the following modification, the differences from the above-described example will be mainly described, and the same components will be designated by the same reference numerals, and the description thereof will be omitted or briefly described. In addition, the description of the action and effect performed in the same manner as in the example described above will be omitted or briefly described.

FIG. 2B schematically shows an example of the sealing device 10A according to the first modification and the bearing device 1A into which the sealing device 10A is incorporated.
In this modification, the seal groove 5A of the inner member 4A is not a concave step portion, but a concave groove that opens toward the outer diameter side and extends in the circumferential direction. The seal groove 5A is partitioned by a groove peripheral surface 5a and a side surface 5b which are substantially the same as described above, and a groove wall surface 5c on the external space side. In the illustrated example, the groove wall surface 5c is formed as a tapered inclined surface whose diameter increases toward the external space side. Further, the outer space side edge portion of the inner member 4A is provided with an edge outer peripheral surface 5d that is continuous with the outer diameter side end portion of the groove wall surface 5c and faces the outer diameter side.
The elastic member 14A of the sealing device 10A is provided with an outer lip portion 19 extending so as to be close to the edge outer peripheral surface 5d of the inner member 4A. The outer side lip portion 19 is provided so as to form a gap constituting the outer side non-contact seal portion S1 with the edge outer peripheral surface 5d of the inner member 4A. With such a configuration, the external non-contact seal portion S1 can more effectively suppress the intrusion of foreign matter and the like into the sealed space 8 side and the leakage of grease to the external space side.

The outer lip portion 19 extends from the inner diameter side end portion 13a of the disc portion 13 of the core member 11 toward the inner diameter side, and the side surface on the outer space side covers the outer side of the disc portion 13 of the elastic member 14A. It is provided so as to be flush with the side surface on the space side. Further, the side surface of the outer lip portion 19 on the sealed space 8 side is a tapered inclined surface whose diameter decreases toward the outer space side. That is, the outer lip portion 19 is formed so that the thickness dimension becomes smaller toward the inner diameter side. In the illustrated example, an example is shown in which the side surface of the outer lip portion 19 on the sealed space 8 side is provided so as to be parallel to the side surface 5b of the seal groove 5A. The extension dimension of the outer lip portion 19 is appropriately set so that a gap constituting the outer non-contact seal portion S1 is formed between the outer peripheral surface 5d and the outer peripheral surface 5d of the inner member 4A.

FIG. 2C schematically shows an example of the sealing device 10B according to the second modification and the bearing device 1B into which the sealing device 10B is incorporated.
Also in this modification, the seal groove 5B of the inner member 4B is a concave groove that opens toward the outer diameter side and extends in the circumferential direction, as in the case of the first modification. In the illustrated example, the groove width dimension of the seal groove 5B, more specifically, the dimension along the axial direction of the groove peripheral surface 5a is shown as an example in which the dimension is larger than that of the first modification.
Further, also in this modification, an example in which the elastic member 14B is provided with an outer lip portion 19A extending so as to be close to the edge outer peripheral surface 5d of the inner member 4B, as in the first modification. Shows. In this modification, the outer lip portion 19A has a substantially uniform thickness from the end portion of the core member 11 on the disk portion 13 side to the tip in the extension direction, and the end on the disk portion 13 side. It is provided so as to extend diagonally with respect to the radial direction from the portion toward the external space side.

In each of the above examples, the base end side piece 16 and the tip end side piece 17 have a shape extending diagonally with respect to the radial direction, but the base end side piece 16 is extended in the axial direction. The shape may be such that the tip side piece 17 is extended in the radial direction. Further, in each of the above examples, an example is shown in which the tip side piece portion 17 has a shape in which the lip portion 15 is naturally parallel to the side surface 5b of the seal grooves 5, 5A, 5B. Not limited. Further, in each of the above examples, the side surface 5b of the seal grooves 5, 5A and 5B is used as an inclined surface, but it may be a vertical surface perpendicular to the axial direction. The configurations of the members and parts constituting the sealing devices 10, 10A, 10B according to the above examples and the bearing devices 1, 1A, 1B into which the sealing devices 10, 10A, 10B are incorporated are not limited to the above examples, and various other modifications are possible. ..

For example, in the protruding dimension of the protrusion 18 provided on the tip side piece 17, the protrusion 18 abuts on the side surface 5b of the seal grooves 5, 5A, 5B, and the tip side piece 17 has the seal groove 5, 5A, The dimensions may be such that they are in close contact with the side surface 5b of the 5B in a non-contact state. Further, the protrusions 18 may be provided intermittently at intervals in the circumferential direction. Further, the protrusion 18 may be provided with a slit, a communication groove, or the like for communicating the sealed space 8 side and the external space side.
The thickness dimension T2 of the tip end side piece 17 may be equal to or greater than the thickness dimension T1 of the proximal end side piece 16. Further, the extension dimension L2 of the tip side piece portion 17 may be an appropriate dimension depending on the arrangement space of the lip portion 15, and the tip in the extension direction is relative to the groove peripheral surfaces 5a of the seal grooves 5, 5A and 5B. The dimensions may be appropriate so that they are in a non-contact state. The extension dimension L2 of the tip end side piece 17 may be about 1.1 to 3 times the extension dimension L1 of the proximal end side piece 16, and is equal to or less than the extension dimension L1 of the proximal end side piece 16. May be.
The extension dimension L1 of the base end side piece portion 16 may be an appropriate dimension depending on the arrangement space of the lip portion 15. Further, the extension dimension L1 of the base end side piece portion 16 has a dimension such that a relatively large gap is formed between the bent portion 15a and the side surface 5b instead of the above-described embodiment, or the bending. The dimensions may be such that the portion 15a stays at a position where it does not face the side surface 5b.

The sealing devices 10, 10A, and 10B may be attached to the outer member 2 on the rotating side. Further, the sealing devices 10, 10A and 10B are not limited to those attached to the outer member 2, and may be attached to the inner members 4, 4A and 4B.
The core member 11 may be sheet metal processed or may be made of a resin such as a fiber reinforced resin.
The material of the rubber used for the elastic members 14, 14A, 14B is not particularly limited, and examples thereof include NBR, H-NBR, EPDM, ACM, AEM, FKM, and silicone rubber.
A configuration in which a mounting groove that opens toward the axial center side is provided on the inner peripheral surface 3a of the outer member 2, and ridges that are fitted into the mounting groove with elastic deformation are provided on the elastic members 14, 14A, 14B, etc. May be. The elastic members 14, 14A and 14B are not limited to those provided so as to cover the outer peripheral surface of the cylindrical portion 12 and the side surface of the disc portion 13 as described above, and the inner diameter side end portion 13a of the disc portion 13 is not limited to the elastic members 14, 14A and 14B. It may be fixed only to.

Further, in each of the above examples, the lubricant in the sealed space 8 may be supplied by oil splashing, oil injection from a nozzle, an oil bath, or the like.
As the bearing devices 1, 1A and 1B, the rolling elements 6 may be provided in a double row between the outer member 2 and the inner members 4, 4A and 4B. Further, the bearing devices 1, 1A and 1B are not limited to the deep groove ball bearings as described above, and may be angular contact ball bearings. Further, the bearing devices 1, 1A, 1B are not limited to ball bearings in which the rolling element 6 is a ball, and may be a roller bearing in which the rolling element 6 is a cylindrical roller, a conical roller, or the like. Bearing devices 1, 1A, 1B may have a flange-shaped or hub-shaped fixing portion on one of the outer member 2 and the inner members 4, 4A, 4B. The bearing devices 1, 1A and 1B are not limited to those that support the shaft 9 of the transmission of various vehicles, and may also support the shaft 9 provided as various rotating portions.

10, 10A, 10B Sealing device 11 Core member 14, 14A, 14B Elastic member 15 Lip part 15a Bending part 16 Base end side piece 17 Tip side piece 18 Protrusion 2 Outer member (first member)
4,4A, 4B inner member (second member)
5,5A, 5B Seal groove 5b Side surface 8 Sealed space L1 Extension dimension of one part on the base end side (dimension along the extension direction)
Extension dimension of one part on the tip side of L2 (dimension along the extension direction)
T1 Thickness dimension of the base end side piece T2 Thickness dimension of the tip side piece S Non-contact seal part

Claims (5)

The lip portion of the elastic member attached to the first member of one of the inner member and the outer member that is relatively coaxially rotated and fixed to the annular core member is the other of the inner member and the outer member. A sealing device that contacts the side surface of the seal groove provided on the second member.
The lip portion is provided in a bent shape with respect to the base end side piece portion extending from the second member side end portion of the core member toward the side surface of the seal groove and the base end side piece portion. A tip-side piece extending from the tip of the end-side piece along the side surface of the seal groove, and a tip-side piece extending from the tip of the tip-side piece toward the side surface of the seal groove. A sealing device characterized by having a protrusion that contacts the side surface. In claim 1,
The tip side piece portion is a sealing device characterized in that the lip portion is provided so as to be parallel to the side surface of the seal groove in a natural state. In claim 1 or 2,
The base end side piece is provided so as to extend diagonally toward the sealed space side which is the side surface side of the seal groove, and the tip end side piece is opposite to the base end side piece. A sealing device characterized in that it is provided so as to extend diagonally toward the external space side. In any one of claims 1 to 3,
The thickness dimension of the base end side piece is larger than the thickness dimension of the tip end side piece.
A sealing device comprising a non-contact sealing portion in which a bent portion with the tip end side piece is brought close to the side surface of the sealing groove to suppress leakage of a lubricant. In any one of claims 1 to 4,
A sealing device characterized in that the dimension along the extending direction of the tip end side piece is larger than the dimension along the extending direction of the base end side piece.

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