JP6708491B2 - Sealing device and bearing device including the same - Google Patents

Description

The present invention relates to a seal device applied to a bearing device composed of an inner member and an outer member that relatively rotate coaxially, and a bearing device including the seal device.

2. Description of the Related Art Conventionally, a sealing device mounted on a bearing device including an inner member and an outer member that relatively coaxially rotate has been known. As such a sealing device, a so-called pack having a structure in which a core metal attached to one member is provided with a seal lip made of an elastic member and the seal lip is elastically brought into contact with a slinger attached to the other member Seals (combined seals) are known. In such a sealing device, since the seal lip is slidably in contact with the slinger, the sliding resistance is increased and the torque of the bearing device tends to be increased.
For example, in Patent Document 1 below, a first shield member in which a first shield portion that is obliquely bent in a direction approaching a ball is provided at one end of a first fitting portion that is fitted to an outer ring, A rolling bearing including a second shield member having a second shield portion that is obliquely bent in a direction away from a ball is provided at one end of a second fit portion that is fitted to an inner ring. There is. This rolling bearing is configured such that the first shield portion and the second shield portion are parallel to each other and a labyrinth seal is formed between them.

Further, in Patent Document 2 below, a first annular member in which three ribs forming a labyrinth seal are provided on an outer peripheral surface of an annular portion fitted to an inner ring, and a dimension between respective end surfaces is a first annular member. A second annular member having a covering portion which is arranged so as to correspond to the dimension between the end faces of the three flange portions of the member, and which is provided with a pair of flange portions that form a labyrinth seal with these three flange portions; There is disclosed a seal structure provided with. This seal structure has a structure in which a breaking portion is provided in the covering portion of the second annular member, and the diameter of the broken portion is expanded so as to separate the second annular member, and the second annular member is covered on the outer peripheral surface of the first annular member. A seal holder is provided to cover the outer peripheral surface of the seal holder.
Further, in Patent Document 3 below, an elastic leg body having radial inner and outer lips extending in the axial direction is attached to an annular leg portion of an outer rigid carrier attached to an outer ring, and is arranged around an axle. A seal assembly is disclosed in which a radially outwardly extending barrier of a metal inner sleeve is provided with an axially extending annular protrusion disposed between lips of an elastic seal body to form a non-contact labyrinth passage. There is. The metal inner sleeve is also provided with a containment flange that extends radially outwardly to maintain the assembly in the assembled condition.

JP2012-193761A Japanese Patent Laid-Open No. 2000-606 Patent No. 5665183

However, in the rolling bearing described in Patent Document 1, the first shield member and the second shield member are in a separated state in a state where they are not assembled to the rolling bearing, and thus the handling and the assembling are easy. From the viewpoint, further improvement is desired.
In addition, in the seal structure described in Patent Document 2, a seal holder including a pair of ring members that are fixed to each other by fixing bolts after the diameter of the second annular member is expanded to cover the outer peripheral surface of the first annular member. Need to be provided so as to cover the second annular member. Further, in the seal assembly described in Patent Document 3 as well, in order to maintain the outer rigid carrier and the metal inner sleeve in the assembled state, the end portion of the metal inner sleeve is caulked in the combined state. It is necessary to fold it to form the containment flange, and the sealing structures and seal assemblies described in Patent Documents 2 and 3 have a problem that the assembly process is complicated.

The present invention has been made in view of the above circumstances, and it is possible to reduce the torque of the bearing device and improve the sealing performance, but also to easily combine the first seal member and the second seal member. It is an object of the present invention to provide a seal device that can be maintained at a high temperature and a bearing device including the seal device.

In order to achieve the above object, a sealing device according to the present invention includes a first seal member mounted on one member of an inner member and an outer member that rotate relative to each other and a first seal member mounted on the other member. And a first cylindrical member fitted to the one member, and a radial direction from a portion of the first cylindrical member axially spaced from each other. A second circular cylinder part fitted to the other member, and a second circular cylinder part having a first circular plate part and a second circular plate part provided so as to project. A third disc portion that is provided so as to project in the radial direction from the portion and that is inserted into a groove portion defined by the first cylindrical portion, the first disc portion, and the second disc portion of the first seal member; And the first disc part is a disc part having elasticity, and the third disc part can be inserted into the groove part with elastic deformation of the disc part. A shaft forming a labyrinth seal that communicates a sealed space between the inner member and the outer member with an outer space in a state where the first seal member and the second seal member are mounted on the inner member and the outer member. The plurality of non-contact seal portions extending in the direction and the plurality of non-contact seal portions extending in the radial direction are alternately formed, and the groove width dimension along the axial direction of the groove portion is the first circular plate. It is characterized in that it is larger than the sum of the projecting dimension of the portion from the first cylindrical portion and the thickness dimension of the third disc portion along the axial direction .
In addition, in order to achieve the above-mentioned object, a sealing device according to the present invention is mounted on a first sealing member mounted on one of an inner member and an outer member that relatively rotate coaxially and on the other member. And a second seal member, wherein the first seal member has a diameter from a first cylindrical portion fitted to the one member and a portion spaced apart in the axial direction of the first cylindrical portion. A first cylindrical portion and a second circular disk portion provided so as to project in a direction, the second seal member includes a second cylindrical portion fitted to the other member, and the second cylindrical portion. A third disc that is provided so as to project from the two cylindrical portions in the radial direction and that is inserted into a groove portion defined by the first cylindrical portion, the first disc portion, and the second disc portion of the first seal member. And a third disc part is an elastic disc part that can be inserted into the groove part with elastic deformation, and the first seal member and the second seal member. And a plurality of non-contact seal portions extending in the axial direction that form a labyrinth seal that communicates the sealed space between the inner member and the outer member with the outer space in a state of being attached to the inner member and the outer member. A plurality of non-contact seal portions extending in the radial direction are alternately formed, and the groove width dimension along the axial direction of the groove portion is such that the third disk portion projects from the second cylindrical portion. The thickness dimension along the axial direction of the third disk portion is larger than the dimension, and the thickness direction along the axial direction is such that the circumferential end portion of the first disk portion and the second cylindrical portion are formed to face each other. Is smaller than the dimension of the non-contact seal portion extending in the radial direction.

According to the present invention, the torque of the bearing device can be reduced and the sealing performance can be improved, but the first seal member and the second seal member can be easily maintained in the combined state. That is, when the first seal member and the second seal member are relatively moved in the direction along the axial direction, the third disk portion is inserted into the groove portion with elastic deformation of the elastic disk portion. be able to. Thereby, the third cylindrical portion of the second seal member is held so as to be sandwiched by the first cylindrical portion and the second cylindrical portion of the first seal member, and the first seal member and the second seal member are combined. Therefore, it is possible to improve the handleability and the assemblability to the bearing device. Further, the first seal member and the second seal member can be easily maintained in the combined state as compared with the combined state in which it is necessary to cover with another member or the case where caulking or the like is required.
Further, since the non-contact type seal can be constituted by the first seal member and the second seal member, the torque of the bearing device can be reduced as compared with a seal lip that elastically contacts. In addition, since deterioration due to wear or the like is less likely to occur, the service life can be extended. Further, at least two non-contact seal portions extending in the axial direction and at least two non-contact seal portions extending in the radial direction are alternately formed, so that a labyrinth seal having a relatively complicated path can be configured. It is possible to improve the sealing performance. With this, it is possible to suppress leakage of the grease filled in the sealed space of the bearing device to the external space, and also to prevent intrusion of dust and the like from the external space into the sealed space of the bearing device. ..

In the present invention, with the third disc portion inserted in the groove, both axial sides of the third disc portion and the first disc portion and the second disc portion are opposed to each other. The non-contact seal portion extending in the radial direction is formed, and the peripheral end portion of the third disc portion and the first cylindrical portion are opposed to each other to form the non-contact seal portion extending in the axial direction. Good.
According to the present invention, two non-contact seal portions that extend in the radial direction with the groove bottom surface and both surfaces in the groove width direction of the groove portion of the first seal member and the circumferential end surface and both surfaces in the axial direction of the third disk portion facing each other, respectively. One non-contact seal portion extending in the axial direction can be formed.

In the present invention, the peripheral end portion of the first disc portion and the peripheral end portion of the second disc portion are opposed to the portion where they are opposed to each other to form a non-contact seal portion extending in the axial direction. May be configured.
According to the present invention, the circumferential end portion of the first disk portion, which is to be arranged on one of the external space side and the sealed space side, and the portion facing the circumferential end portion are opposed to each other and extend in the axial direction. The non-contact seal portion is formed, and the peripheral end portion of the second disk portion, which is to be arranged on the other side of the external space side and the sealed space side, is opposed to the portion facing the peripheral end portion in the axial direction. A non-contact seal portion extending to the is formed. That is, a non-contact seal portion extending in the axial direction is formed on each of the sealed space side and the external space side of the labyrinth seal that connects the sealed space and the external space. As a result, the grease filled in the sealed space of the bearing device can be more effectively suppressed from leaking to the external space, and dust and the like can be prevented from entering the sealed space of the bearing device from the external space. It can be effectively suppressed.

In the present invention, the first disc portion is configured such that a projecting dimension from the first cylindrical portion is smaller than a projecting dimension of the second disc portion from the first cylindrical portion, At least one of the first disc portion and the third disc portion is the elastic disc portion, and the peripheral end portion of the first disc portion and the peripheral end portion of the third disc portion are May be arranged so as to overlap each other when viewed in the axial direction.
According to the present invention, both the first disc portion and the third disc portion are moved by relatively moving the third disc portion in the axial direction from the side of the first disc portion having a small protruding dimension. Alternatively, the third disk portion can be easily inserted into the groove portion with elastic deformation of one side.

In the present invention, the peripheral end portion of the third disc portion and the first disc portion and the second disc portion are arranged so as to overlap each other over the entire circumference when viewed in the axial direction. May be
According to the present invention, at least one of the first disk portion, the second disk portion and the third disk portion is provided with a notch-shaped recess at the peripheral end portion so as not to overlap with each other. It is possible to effectively improve the sealing property as compared with other materials.

In the present invention, the first circular disk portion is the elastic circular disk portion, and the groove width dimension along the axial direction of the groove portion is the protrusion dimension of the first circular disk portion from the first cylindrical portion. And a thickness dimension along the axial direction of the third disc portion may be larger than the sum of the dimensions.
According to the present invention, the first seal member and the second seal member are relatively moved in the direction along the axial direction so that the third disc portion is inserted into the groove portion with the elastic deformation of the first disc portion. It is possible to prevent the first disc portion from falling when combined with each other. That is, when the first seal member and the second seal member are relatively moved in the direction along the axial direction, the first disc portion is pressed down by the third disc portion and is in a laid-down state. However, if the third disk portion is brought close to or in contact with the second disk portion, the third disk portion gets over the first disk portion, and the first disk portion can be restored. Become.

In the present invention, the elastic disk portion may be formed so that the cross-sectional shape viewed in the circumferential direction is line-symmetrical with the axis of symmetry as the axis of symmetry.
For example, when the elastic disc portion is formed into a lip shape inclined to one side in the axial direction or has a concave portion provided on one side in the axial direction, the disc portion becomes the rotation side. When provided on a member, it is conceivable that the disk portion may be deformed so as to fall or rise due to centrifugal force. It is possible that they may come into contact. According to the present invention, even when an elastic disk portion is provided on a member on the rotation side, deformation due to centrifugal force can be suppressed, and the disk portion and the portion facing it do not come into contact with each other. The seal part can be secured.

Further, in order to achieve the above object, the bearing device according to the present invention includes an inner member and an outer member that relatively coaxially rotate, and a sealing device according to the present invention attached to these members. Characterize.
According to the present invention, as described above, the torque can be reduced and the sealing property can be improved.

The seal device according to the present invention and the bearing device including the seal device are configured as described above, so that the torque of the bearing device can be reduced and the sealability can be improved, while the first seal member is also provided. The second seal member and the second seal member can be easily maintained in the combined state.

FIG. 1 is a schematic vertical cross-sectional view schematically showing an example of a seal device according to an embodiment of the present invention and an example of a bearing device including the seal device. (A) is a partially broken schematic enlarged vertical cross-sectional view corresponding to the X part in FIG. 1, and (b) is a schematic vertical sectional view corresponding to (a) schematically showing a state when the sealing device is combined. It is a side view. It is a schematic side view of the same sealing device seen from the V direction in FIG. FIG. 2A is a partially cutaway schematic enlarged vertical cross-sectional view schematically showing an example of a seal device according to another embodiment of the present invention and an example of a bearing device including the seal device, and FIG. , (B) are schematic vertical cross-sectional views corresponding to (a) schematically showing a state in which the same sealing device is assembled. FIG. 2A schematically shows an example of a sealing device according to still another embodiment of the present invention and an example of a bearing device including the same, and a partially cutaway schematic enlarged vertical cross-section corresponding to FIG. Drawing (b) is an outline longitudinal section corresponding to (a) which shows typically the state at the time of combining the same sealing device. FIG. 2A schematically shows an example of a sealing device according to still another embodiment of the present invention and an example of a bearing device including the same, and a partially cutaway schematic enlarged vertical cross-section corresponding to FIG. Drawing (b) is an outline longitudinal section corresponding to (a) which shows typically the state at the time of combining the same sealing device. FIG. 2A schematically shows an example of a sealing device according to still another embodiment of the present invention and an example of a bearing device including the same, and a partially cutaway schematic enlarged vertical cross-section corresponding to FIG. Drawing (b) is an outline longitudinal section corresponding to (a) which shows typically the state at the time of combining the same sealing device.

Embodiments of the present invention will be described below with reference to the drawings.
Note that in some of the drawings, some of the detailed reference numerals attached to other drawings are omitted.
Moreover, in FIG. 2, FIG. 4 to FIG. 7, the rear side of the cut surface is illustrated as an end view of the cut portion, which is not shown.
1 to 3 are diagrams schematically showing an example of the seal device according to the first embodiment and an example of a bearing device including the seal device.

As shown in FIG. 1, the sealing device 9 according to the present embodiment is configured to be mounted on a bearing device 1 including an inner ring 4 serving as an inner member and an outer ring 5 serving as an outer member, which relatively coaxially rotate. ing.
The bearing device 1 according to the present embodiment includes an inner ring 4 and an outer ring 5, and a sealing device 9 according to the present embodiment attached to these.
FIG. 1 shows an example in which the shaft 2 is inserted through the inner ring 4 and the outer ring 5 is fitted in the bearing portion 3 such as a housing. Note that the shaft 2 is rotated with respect to the bearing portion 3, that is, the inner ring 4 as a rotating member is rotated with respect to the outer ring 5 as a fixed member, and the outer ring 5 is rotated with respect to the inner ring 4. It may be an aspect.
Further, the bearing device 1 is a rolling bearing device in which rolling elements (balls in the illustrated example) 8 are interposed between the inner ring 4 and the outer ring 5.
An annular sealed space 6 is formed between the inner ring 4 and the outer ring 5 over the entire circumference.

In the sealed space 6, a single row of rolling elements 8 is held by a retainer (retainer) 7, and a race ring 4a of the inner ring 4 and a race ring 5a of the outer ring 5 are rollably interposed. , Filled with grease. The bearing device 1 may have a configuration in which the rolling elements 8 are provided in a double row between the inner ring 4 and the outer ring 5. Further, the bearing device 1 is not limited to the deep groove ball bearing in which the inner ring 4 and the outer ring 5 are provided with the groove-shaped race rings 4a and 5a as shown in the example, and may be an angular ball bearing. Further, the bearing device 1 is not limited to a ball bearing in which the rolling elements 8 are balls, and may be a roller bearing in which the rolling elements 8 are cylindrical rollers or tapered rollers. The bearing device 1 may have a flange-shaped or hub-shaped fixed portion on one side.
In addition, the seal device 9 according to the present embodiment is mounted between the inner ring 4 and the outer ring 5 at both ends of the sealed space 6 in the axial direction 2 respectively. Both ends of the sealed space 6 in the axial direction 2 are sealed by the sealing devices 9 on both sides in the axial direction 2 so that foreign matter and the like enter the sealed space 6 and the grease filled in the sealed space 6 is exposed to the outside. Leakage to the ground is suppressed. Since the sealing devices 9 and 9 on both sides in the axial direction 2 have the same configuration as each other, one sealing device 9 will be described below as an example.

As shown in FIG. 2A, the sealing device 9 includes a first seal member 10 attached to one member 4 of the inner ring 4 and the outer ring 5 and a second seal member 20 attached to the other member 5. It has and. In the present embodiment, one member is the inner ring 4 and the other member is the outer ring 5.
The first seal member 10 is provided so as to protrude in the radial direction from each of the first cylindrical portions 12 and 16 fitted into the inner ring 4 and the portions of the first cylindrical portions 12 and 16 spaced in the axial 2 direction. It has the 1st disc part 17 and the 2nd disc part 13 which were formed. The second seal member 20 is provided so as to protrude from the second cylindrical portions 22 and 26 fitted to the outer ring 5 and the second cylindrical portions 22 and 26 in the radial direction, and is the first seal member of the first seal member 10. It has a cylindrical portion 12, 16, a first disc portion 17, and a third disc portion 27 that is inserted into a groove portion 30 defined by the second disc portion 13. Further, at least one of the first disc part 17, the second disc part 13 and the third disc part 27 is a disc part 17 having elasticity, and the disc part 17 is elastically deformed. The third disk portion 27 can be inserted into the groove portion 30 (see FIG. 2B). In addition, the sealing device 9 is a labyrinth that communicates the sealed space 6 between the inner ring 4 and the outer ring 5 with the outer space in a state where the first seal member 10 and the second seal member 20 are attached to the inner ring 4 and the outer ring 5. A plurality of non-contact seal portions 31, 33, 35 forming the seal and extending in the axial direction and a plurality of non-contact seal portions 32, 34 extending in the radial direction are alternately formed.

In the present embodiment, the first seal member 10 is configured such that the first elastic member 15 is fixed to the first core metal 11, the second seal member 20 is fixed to the second core metal 21, and the second elastic member 25 is fixed to the second core metal 21. It is configured. The first cored bar 11 and the second cored bar 21 are made of a metal material such as a stainless steel plate or a cold rolled steel plate (SPCC), and have a sheet-metal processed ring shape.
The first cored bar 11 is fitted to the outer peripheral surface 4b of the inner ring 4 and constitutes the first cylindrical part, and one side of the cored bar cylindrical part 12 in the axial 2 direction (the sealed space 6 side). ) A cored bar disc portion 13 which is connected to the end portion and is provided in an annular shape so as to project radially outward from the end portion and which constitutes a second disc portion.

The surface of the cored bar disc portion 13 facing the other side in the axial direction 2 (outer space side) constitutes the groove inner wall surface on one side in the groove width direction (the same direction as the axial direction 2) of the groove portion 30.
Further, the core metal disc portion 13 is a non-contact seal portion that extends in the axis 2 direction and faces the inner peripheral surface 5b of the outer ring 5 that is a portion where the tip end in the protruding direction that is the peripheral end portion thereof faces. 5 The non-contact seal portion 35 is formed. The projecting dimension along the radial direction of the cored bar disk portion 13 has a slight gap between the tip portion of the first seal member 10 mounted on the inner ring 4 and the inner peripheral surface 5b of the outer ring 5. The fifth non-contact seal portion 35 forming the labyrinth seal may be formed to have an appropriate size. Further, the cored bar disc portion 13 is configured such that a substantially non-uniform fifth non-contact seal portion 35 is formed over the entire circumference between the tip end portion thereof and the inner peripheral surface 5b of the outer ring 5. There is.
The first cored bar 11 may have a substantially uniform cross-sectional shape over the entire circumference.

The first elastic member 15 is made of a rubber material (elastic material) such as NBR, H-NBR, ACM, AEM, FKM, and silicone rubber, and is integrally fixed to the first core metal 11 by vulcanization molding or the like. The first elastic member 15 is provided so as to cover the outer peripheral surface of the cored bar cylindrical portion 12 of the first cored bar 11, and the elastic cylindrical section 16 that constitutes the first cylindrical section and the shaft of the elastic cylindrical section 16 are provided. An elastic disc portion 17 that is continuous with the other end (outside space side) in the two directions and that is annularly provided so as to project radially outward from the end and that constitutes the first disc portion. ing. In the present embodiment, when the elastic disc portion 17 constituting the first disc portion is moved in the axial 2 direction with respect to each other so as to combine the first seal member 10 and the second seal member 20, the elastic disc portion 17 is mainly elastic. The disk portion has elasticity to be deformed.
Further, the first elastic member 15 includes an outer end covering portion 18 provided so as to cover the other end (outer space side) of the cored bar cylindrical portion 12 of the first cored bar 11 in the axial direction 2. .. In the present embodiment, the elastic disc portion 17 is provided so as to be located on the one side in the axial 2 direction (the sealed space 6 side) with respect to the outer end covering portion 18.
In the elastic cylindrical portion 16, the outer peripheral surface between the metal core disc portion 13 and the elastic disc portion 17 constitutes the groove bottom surface of the groove portion 30. In the illustrated example, the outer peripheral surface of the elastic cylindrical portion 16 on the other side in the axial direction 2 (outer space side) with respect to the elastic disc portion 17 is positioned on the axial center side (radially inner side) of the groove bottom surface of the groove portion 30. The example shown in FIG. That is, the thickness dimension of the elastic cylinder portion 16 along the radial direction of the portion on the outer space side of the elastic disc portion 17 is the thickness of the portion of the groove portion 30 of the elastic cylinder portion 16 along the radial direction. The size is smaller than the size, and the outer end covering portion 18 is provided so as to be continuous with this external space side portion.

A surface of the elastic disc portion 17 facing one side in the axial direction 2 (the sealed space 6 side) constitutes a groove inner wall surface on the other side of the groove portion 30 in the groove width direction. The elastic disk portion 17 and the core metal disk portion 13 define both sides in the groove width direction, and the groove portion 30 in which the elastic cylinder portion 16 defines the groove bottom is opened toward the outside in the radial direction. It is provided over the entire circumference of the seal member 10.
Further, in the present embodiment, the protrusion dimension H along the radial direction from the elastic cylindrical portion 16 forming the first cylindrical portion of the elastic disc portion 17 is set to the protrusion from the elastic cylindrical portion 16 of the core metal disc portion 13. It is smaller than the size. That is, the protruding dimension H of the elastic disk portion 17 from the groove bottom surface of the groove portion 30 is set to be smaller than the protruding dimension H of the core metal disk portion 13 from the groove bottom surface.
In addition, the elastic disc portion 17 is opposed to the inner peripheral surface of the elastic base portion 26 of the second elastic member 25, which is a portion where the tip end in the projecting direction, which is the peripheral end portion, opposes, and extends in the axial 2 direction in a non-contact manner. The first non-contact seal portion 31 as a seal portion is formed. The protruding dimension H of the elastic disc portion 17 is such that the tip end portion and the elastic base portion 26 of the second elastic member 25 are in a state where the first seal member 10 and the second seal member 20 are attached to the inner ring 4 and the outer ring 5. It may be of an appropriate size so that the first non-contact seal portion 31 forming a labyrinth seal with a slight clearance is formed between the inner peripheral surface and the inner peripheral surface. Further, the elastic disc portion 17 has a first non-contact seal portion 31 which is substantially uniform over the entire circumference between the tip of the elastic disc portion 17 and the inner peripheral surface of the elastic base portion 26 of the second elastic member 25. Is configured. In the present embodiment, with the first seal member 10 and the second seal member 20 mounted on the inner ring 4 and the outer ring 5, the dimension of the first non-contact seal portion 31 along the radial direction and the above-mentioned fifth non-contact state. The size of the seal portion 35 along the radial direction is substantially the same.

Further, in the present embodiment, the elastic disc portion 17 is formed so that the cross-sectional shape viewed in the circumferential direction is line-symmetrical with the axis 2 direction center line as the axis of symmetry. Further, the elastic disc portion 17 has a substantially rectangular cross-section when viewed in the circumferential direction. That is, the elastic disc portion 17 is formed to extend radially outward without being inclined in the direction of the axis 2.
The thickness dimension of the elastic disc portion 17 along the axis 2 direction is smaller than the dimension of the third non-contact seal portion 33, which will be described later, along the radial direction. The thickness dimension of the elastic disc portion 17 may be set to an appropriate dimension from the viewpoint of elastic deformability, sealability, assemblability, non-separability after combination, and the like. Further, in the illustrated example, the thickness dimension of the elastic disc portion 17 is shown to be approximately the same as the thickness dimension of the core metal disc portion 13 along the axis 2 direction. The thickness may be less than or equal to the thickness of the portion 13.
Note that the first elastic member 15 may have a substantially uniform cross-sectional shape over the entire circumference.

The second cored bar 21 is fitted to the inner peripheral surface 5b of the outer ring 5 and constitutes a second cylindrical part, and a cored bar cylindrical part 22 and the other side in the axial direction 2 of the cored bar cylindrical part 22 (outer space side). The metal core disc portion 23 is provided in an annular shape so as to be continuous with the end portion and project inward in the radial direction from the end portion.
The mandrel disc part 23 is arranged so as to overlap the tip end part of the mandrel disc part 13 of the first seal member 10 when viewed in the direction of the axis 2.
Further, the core metal disc portion 23 has a first surface facing the other side in the axial direction 2 (outer space side) in a state where the first seal member 10 and the second seal member 20 are attached to the inner ring 4 and the outer ring 5. The seal member 10 is arranged so as to be substantially flush with the surface of the outer end covering portion 18 of the seal member 10 facing the other side in the axial direction 2 (outer space side).
The second cored bar 21 may have a substantially uniform cross-sectional shape over the entire circumference.

The second elastic member 25 is made of a rubber material similar to the above, and is integrally fixed to the second core metal 21 by vulcanization molding or the like. The second elastic member 25 is provided so as to cover the inner peripheral surface of the cored bar cylindrical portion 22 of the second cored bar 21, and an elastic base portion 26 forming the second cylindrical portion and the shaft 2 of the elastic base portion 26. An elastic disc portion 27 which is continuous with the one end in the direction (on the side of the sealed space 6) and which is annularly provided so as to protrude inward in the radial direction from the end portion and which constitutes the third disc portion. I have it.
Further, the second elastic member 25 includes an inner end covering portion 28 provided so as to cover an end portion of the cored bar cylindrical portion 22 of the second cored bar 21 on one side in the axis 2 direction (sealed space 6 side). ing. Further, the second elastic member 25 includes an axial center end covering portion 29 provided so as to cover the axial center side end portion of the cored bar disc portion 23 of the second cored bar 21. In the present embodiment, the elastic base portion 26 covers the surface of the mandrel disc portion 23 of the second mandrel 21 that faces one side in the axis 2 direction (the sealed space 6 side), and the shaft end covering portion. It is configured so as to be connected to 29. Further, the inner peripheral surface of the elastic base portion 26 and the inner peripheral surface of the shaft center end covering portion 29 on the other side (outer space side) in the axial direction 2 with respect to the elastic disc portion 27 are provided so as to be flush with each other.

Further, the elastic disc portion 17 of the first seal member 10 described above is provided on the inner peripheral surfaces of the elastic base portion 26 and the axial center end covering portion 29 on the other side (outer space side) in the axis 2 direction with respect to the elastic disc portion 27. The tips are opposed.
The elastic disc portion 27 is configured to be inserted into the groove portion 30 of the first seal member 10. In the present embodiment, in a state where the elastic disc portion 27 is inserted into the groove portion 30, both sides of the elastic disc portion 27 in the axial direction 2 and the elastic disc portion 17 and the core metal disc portion 13 of the first seal member 10 are connected. The second non-contact seal part 32 and the fourth non-contact seal part 34 are formed as non-contact seal parts that face each other and extend in the radial direction. Further, in a state where the elastic disc portion 27 is inserted into the groove portion 30, the tip end portion in the protruding direction which is the peripheral end portion of the elastic disc portion 27 and the elastic cylindrical portion 16 of the first seal member 10 are opposed to each other and the shaft 2 A third non-contact seal portion 33 is formed as a non-contact seal portion extending in the direction. That is, in a state in which the elastic disc portion 27 is inserted into the groove portion 30, the second portion extending in the radial direction between both sides of the elastic disc portion 27 in the axial 2 direction and groove inner wall surfaces on both sides of the groove portion 30 in the groove width direction. The non-contact seal portion 32 and the fourth non-contact seal portion 34 are formed, and the third non-contact seal portion 33 extending in the axial 2 direction is formed between the tip end portion of the elastic disc portion 27 and the groove bottom surface of the groove portion 30. It is configured to.

Further, the distal end portion of the elastic disc portion 27 and the distal end portion of the elastic disc portion 17 of the first seal member 10 are arranged so as to overlap each other when viewed in the axial 2 direction. That is, the tip ends of the elastic disc portion 17 of the first seal member 10 and the elastic disc portion 27 of the second seal member 20 are arranged so as to overlap each other when viewed in the axial 2 direction.
Further, the tip end portion of the elastic disc portion 27 and the elastic disc portion 17 and the core metal disc portion 13 of the first seal member 10 are arranged so as to overlap each other over the entire circumference when viewed in the axial 2 direction. It is configured (see FIG. 3). In the present embodiment, the elastic disc portion 27 of the second seal member 20 and the elastic disc portion 17 and the core disc portion 13 of the first seal member 10 have a substantially uniform cross-sectional shape over the entire circumference. I am supposed to. That is, the overlapping width dimension along the radial direction of the tip end portion of the elastic disc portion 27 and the elastic disc portion 17 of the first seal member 10 and the core metal disc portion 13 in the state viewed in the axis 2 direction is the entire circumference. It is configured to have a substantially uniform size over the entire length.

Further, in this embodiment, when the elastic disc portion 27 is assembled with the first seal member 10 and the second seal member 20 so as to move in the axial 2 direction, the elastic disc portion of the first seal member 10 is moved. The rigidity is higher than that of the elastic disc portion 17 of the first seal member 10 so that it is less likely to be elastically deformed than the portion 17. As shown in FIG. 2B, the elastic disc portion 27 does not substantially deform when the first seal member 10 and the second seal member 20 are combined so as to move in the axial 2 direction. It may be configured. In the illustrated example, the thickness dimension T of the elastic disc portion 27 along the axis 2 direction is set to be about three times the thickness dimension of the elastic disc portion 17 of the first seal member 10 along the axis 2 direction. An example is shown. Further, the elastic disc portion 27 is formed so that the cross-sectional shape when viewed in the circumferential direction is line-symmetrical with the axis 2 direction center line as the axis of symmetry. Further, the elastic disc portion 27 has a substantially rectangular cross-sectional shape when viewed in the circumferential direction. That is, the elastic disc portion 27 is formed so as to extend toward the axial center without being inclined in the axis 2 direction.

Further, the sum of the thickness dimension T of the elastic disc portion 27 and the protrusion dimension H of the elastic disc portion 17 of the first seal member 10 is set to be smaller than the groove width dimension W of the groove portion 30. That is, as shown in FIG. 2B, when the first seal member 10 and the second seal member 20 are combined so as to move in the axial 2 direction with respect to each other, the elastic disc portion 27 of the second seal member 20. The groove width dimension W of the groove portion 30 is set to the thickness dimension T of the elastic disc portion 27 and the first seal so that the elastic disc portion 17 of the first seal member 10 that is elastically deformed so as to fall down can be restored. It is set to be larger than the sum of the projection size H of the elastic disk portion 17 of the member 10 and the total size. When the elastic disc portion 27 is made of an elastic material as in the present embodiment, the first seal member 10 and the second seal member 20 are moved in the axial 2 direction with respect to each other. In the combined state, the respective dimensions H and T are taken into consideration in consideration of the deformation of the elastic disc portion 27 so that the elastic disc portion 17 of the first seal member 10 that is elastically deformed is not caught and fell. , W may be set.

Further, the thickness T of the elastic disc portion 27 and the protrusion size of the elastic base portion 26 from the inner peripheral surface are in a state where the first seal member 10 and the second seal member 20 are attached to the inner ring 4 and the outer ring 5. The non-contact seal portions 32, 33, 34 forming a labyrinth seal having a slight gap are formed between both ends of the elastic disc portion 27 in the axial direction 2 and the tip portion and both groove inner wall surfaces and groove bottom surfaces of the groove portion 30. As described above, the size may be set appropriately. Further, the elastic disc portion 27 is configured such that the second non-contact seal portion 32, which is substantially uniform over the entire circumference, is formed between the elastic disc portion 27 and the elastic disc portion 17 of the first seal member 10. .. Further, the elastic disk portion 27 is configured such that a substantially uniform third non-contact seal portion 33 is formed over the entire circumference between the elastic disc portion 27 and the elastic cylindrical portion 16 of the first seal member 10. Further, the elastic disc portion 27 is configured such that a substantially uniform fourth non-contact seal portion 34 is formed over the entire circumference between the elastic disc portion 27 and the core metal disc portion 13 of the first seal member 10. There is. Further, the fourth non-contact seal portion 34 is also formed so as to be continuous between the elastic base portion 26 and the core metal disc portion 13, which are provided so as to be continuous with the elastic disc portion 27 in the radial direction.

In the sealing device 9 according to the present embodiment having the above-described configuration, if the first seal member 10 and the second seal member 20 are attached to the inner ring 4 and the outer ring 5, the labyrinth that allows the external space and the sealed space 6 to communicate with each other. A seal is formed. In the present embodiment, the dimension of the second non-contact seal portion 32 along the axis 2 direction and the dimension of the fourth non-contact seal portion 34 along the axis 2 direction are configured to be substantially the same. The dimension of the third non-contact seal portion 33 along the radial direction and the dimension of the first non-contact seal portion 31 and the fifth non-contact seal portion 35 along the radial direction are substantially the same. ing. Further, the dimensions of the first non-contact seal portion 31, the third non-contact seal portion 33, and the fifth non-contact seal portion 35 extending in the axial 2 direction when viewed in the circumferential direction and the radial direction when viewed in the circumferential direction. The second non-contact seal part 32 and the fourth non-contact seal part 34 extending in the direction of the axis 2 are configured to have substantially the same size. That is, in the present embodiment, the gap size of the labyrinth seal when viewed in the circumferential direction is substantially uniform over the entire space from the external space to the sealed space 6, except for the location where the recess 26a described later is provided. It has different dimensions.

Further, the first non-contact seal portion 31 forming an opening on the outer space side of the labyrinth seal is formed so as to open at a substantially central portion in the radial direction between the inner ring 4 and the outer ring 5. Further, the second non-contact seal portion 32 is formed so as to be continuous with the sealed space 6 side of the first non-contact seal portion 31 and extend toward the axial center side. Further, the third non-contact seal portion 33 is formed so as to be continuous with the axial center side of the second non-contact seal portion 32 and extend toward the sealed space 6 side. Further, the fourth non-contact seal portion 34 is formed so as to be continuous with the sealed space 6 side of the third non-contact seal portion 33 and extend outward in the radial direction. Further, the fifth non-contact seal portion 35 is formed so as to be continuous to the outside in the radial direction of the fourth non-contact seal portion 34 and extend toward the sealed space 6 side. Further, a fifth non-contact seal portion 35 forming an opening on the sealed space 6 side of the labyrinth seal is formed so as to open along the inner peripheral surface 5b of the outer ring 5.

Further, in the present embodiment, the elastic base portion 26 of the second elastic member 25 is provided with the concave portion 26a forming the grease trap. With such a configuration, a grease reservoir can be formed in the recess 26a, and the leakage of grease to the external space can be effectively suppressed.
The recess 26a is the core of the first seal member 10 that is one side in the axial direction 2 (sealed space 6 side) when the first seal member 10 and the second seal member 20 are mounted on the inner ring 4 and the outer ring 5. It is provided so as to open toward the tip portion of the gold disc portion 13. Further, the recesses 26a may be provided in a groove shape extending in the circumferential direction over the entire circumference, or may be provided at intervals in the circumferential direction. The recess 26a is provided so as not to overlap with the elastic disc portion 27 when viewed in the direction of the axis 2. The position where the recess 26a is provided, the depth dimension along the axis 2 direction, and the width dimension along the radial direction are such that grease can be received, and from the viewpoint of suppressing elastic deformation of the elastic disc portion 27, and the like. It may be an appropriate position or size. In addition, the surface of the inner end covering portion 28, which is radially outward of the recess 26a, facing the sealed space 6 side, has the elastic base portion 26 and the sealed space 6 of the elastic disk portion 27 provided so as to be continuous with the elastic base portion 26. The structure is provided so as to be substantially flush with the surface facing the side. In the illustrated example, a C-chamfered chamfer is provided at a corner on the radially outer side of the inner end covering 28 on the sealed space 6 side, and the inner end covering 28 excluding the chamfer is formed. The surface of the elastic base portion 26 and the elastic disc portion 27 facing the sealed space 6 side is substantially flush with the surface of the elastic base portion 26 and the elastic disk portion 27 facing the sealed space 6 side.
The second elastic member 25 may have a substantially uniform cross-sectional shape over the entire circumference.

The seal device 9 and the bearing device 1 including the seal device 9 according to the present embodiment are configured as described above, so that the torque of the bearing device 1 can be reduced and the sealability can be improved. The first seal member 10 and the second seal member 20 can be easily maintained in the combined state.
In other words, the first disc member 10 protrudes in the radial direction (radially outward in the present embodiment) from the portions of the first cylindrical member 12, 16 that are spaced apart in the axial 2 direction. (Elastic disc portion) 17 and second disc portion (core disc portion) 13 are provided. Further, the second seal member 20 is provided with a third disk portion (elastic disk portion) 27 so as to project from the second cylindrical portions 22 and 26 in the radial direction (in the present embodiment, the radial inner side). I am trying. At least one of the elastic disc portion 17, the core metal disc portion 13 and the elastic disc portion 27 is an elastic disc portion (elastic disc portion) 17, and the elastic disc portion The elastic disc portion 27 can be inserted into the groove portion 30 of the first seal member 10 with the elastic deformation of 17. Therefore, when the first seal member 10 and the second seal member 20 are relatively moved in the direction along the axis 2 direction, the second seal is accompanied by elastic deformation of the elastic disc portion 17 of the first seal member 10. The elastic disc portion 27 of the member 20 can be inserted into the groove portion 30. As a result, the elastic disc portion 27 of the second seal member 20 is held so as to be sandwiched between the elastic disc portion 17 of the first seal member 10 and the core disc portion 13, and the first seal member 10 and the second seal member 10 are retained. It is possible to maintain the combined state with the seal member 20, and it is possible to improve the handleability and the assemblability to the bearing device 1. Further, the first seal member 10 and the second seal member 20 can be easily maintained in the combined state as compared with the combined state in which it is necessary to cover with another member or the case where caulking or the like is required. it can.

Further, with the first seal member 10 and the second seal member 20 mounted on the inner member (inner ring) 4 and the outer member (outer ring) 5, the sealed space 6 between the inner ring 4 and the outer ring 5 and the outer space A plurality of non-contact seal portions 31, 33, 35 extending in the axial direction and a plurality of non-contact seal portions 32, 34 extending in the radial direction, which form a labyrinth seal that communicates with each other, are alternately formed. Therefore, since the non-contact type seal can be configured by the first seal member 10 and the second seal member 20, the torque of the bearing device 1 is reduced as compared with a seal lip that elastically contacts. Moreover, since deterioration due to wear or the like is less likely to occur, the useful life can be extended. Further, at least two non-contact seal portions 31, 33, 35 extending in the axial 2 direction and at least two non-contact seal portions 32, 34 extending in the radial direction are alternately formed, which is relatively complicated. A labyrinth seal having a different path can be configured, and the sealing performance can be improved. As a result, the grease filled in the sealed space 6 of the bearing device 1 can be prevented from leaking to the external space, and foreign matter such as dust enters the sealed space 6 of the bearing device 1 from the external space. Can be suppressed.

Further, in the present embodiment, with the elastic disc portion 27 of the second seal member 20 inserted in the groove portion 30, both sides in the axial direction of the elastic disc portion 27 and the elastic disc portion 17 of the first seal member 10 are provided. And non-contact seal portions 32 and 34 extending in the radial direction are formed so as to face the core metal disc portion 13 and the tip end portion of the elastic disc portion 27 and the first cylindrical portions 12 and 16 face each other and the shaft is provided. The non-contact seal portion 33 extending in two directions is formed. Therefore, two non-contact seals extending in the radial direction in which the inner wall surfaces and the bottom surface of the groove of the groove portion 30 of the first seal member 10 are opposed to the axial both side surfaces and the tip end surface of the elastic disk portion 27, respectively. The parts 32, 34 and one non-contact seal part 33 extending in the axial direction can be formed.

In addition, in the present embodiment, the distal end portion of the elastic disc portion 17 and the distal end portion of the core metal disc portion 13, and the inner peripheral surface of the elastic base portion 26 and the inner peripheral surface 5b of the outer ring 5 as the portions where these are opposed to each other. Are formed so as to face each other and form non-contact seal portions 31 and 35 extending in the axis 2 direction. Therefore, the tip end portion of the cored bar disc portion 13 to be arranged on one of the outer space side and the sealed space 6 side is opposed to the inner peripheral surface 5b of the outer ring 5 which opposes the shaft portion. A non-contact seal part 35 extending in two directions is formed. Further, the tip end portion of the elastic disc portion 17 to be arranged on the other side of the outer space side and the sealed space 6 side and the inner peripheral surface of the elastic base portion 26 which opposes this end portion are opposed to each other and the shaft 2 is provided. A non-contact seal portion 31 extending in the direction is formed. That is, the non-contact seal portions 31 and 35 are formed on the sealed space 6 side and the external space side of the labyrinth seal that connect the sealed space 6 and the external space. As a result, the grease filled in the sealed space 6 of the bearing device 1 can be more effectively suppressed from leaking to the external space, and dust and the like from the external space to the sealed space 6 of the bearing device 1 can be suppressed. Can be suppressed more effectively.

Further, in this embodiment, the protrusion dimension H of the elastic disc portion 17 of the first seal member 10 from the first cylindrical portions 12 and 16 is set to be the protrusion dimension H of the core metal disc portion 13 from the first cylindrical portions 12 and 16. It is smaller than the size. Further, at least one of the elastic disc portion 17 and the elastic disc portion 27 of the second seal member 20 is a disc portion 17 having elasticity, and the tip end portion of the elastic disc portion 17 and the elastic disc portion The distal end of the portion 27 is arranged so as to overlap with each other when viewed in the axis 2 direction. Therefore, by moving the elastic disc portion 27 relatively in the axial direction from the side of the elastic disc portion 17 having the small protruding dimension H, both or one of the elastic disc portion 17 and the elastic disc portion 27 is moved. The elastic disc portion 27 of the second seal member 20 can be easily inserted into the groove portion 30 with elastic deformation.

In addition, in the present embodiment, the distal end portion of the elastic disc portion 27 of the second seal member 20, the elastic disc portion 17 and the core disc portion 13 of the first seal member 10 are all viewed in the axial 2 direction. It is arranged so as to overlap each other over the circumference. Therefore, as compared with a case where a cutout-shaped concave portion is provided at a tip end portion of at least one of the elastic disk portion 17, the core metal disk portion 13 and the elastic disk portion 27 to provide a portion which does not overlap each other. Thus, the sealing property can be effectively improved.

Further, in the present embodiment, the elastic disc portion 17 of the first seal member 10 is the elastic disc portion 17, and the groove width dimension W of the groove portion 30 along the axis 2 direction is the elastic disc portion 17. Is larger than the sum of the dimension H of the protrusion from the first cylindrical portions 12 and 16 and the thickness T of the elastic disc portion 27 of the second seal member 20 along the axis 2 direction. Therefore, the first seal member 10 and the second seal member 20 are relatively moved in the axial direction so that the elastic disc portion 27 is inserted into the groove portion 30 with the elastic deformation of the elastic disc portion 17. It is possible to prevent the elastic disc portion 17 from falling down when combined. That is, when the first seal member 10 and the second seal member 20 are relatively moved in the direction along the axis 2 direction, the elastic disc portion 17 is pressed down by the elastic disc portion 27 and is laid down. However, if the elastic disc portion 27 is brought close to or in contact with the cored disc portion 13, the elastic disc portion 27 will pass over the elastic disc portion 17 and the elastic disc portion 17 Restore is possible.

Further, in the present embodiment, the elastic disc portion (elastic disc portion) 17 is formed so that the cross-sectional shape viewed in the circumferential direction is line-symmetrical with the axial center line as the axis of symmetry. There is. For example, when the elastic disc portion 17 is formed into a lip shape inclined to one side in the axial 2 direction or a shape in which a concave portion or a convex portion is provided on one side in the axial 2 direction, the circular disc portion When the member (first seal member) 10 having the portion 17 is attached to the member on the rotating side, the disc portion 17 is deformed so as to be tilted by the centrifugal force or deformed so as to rise. It is conceivable that this causes the disc portion 17 to come into contact with the opposing portions 26 and 27. According to the above configuration, even when the elastic disc portion 17 is provided on the member on the rotation side, the deformation due to the centrifugal force can be suppressed, and the disc portion 17 and the portion 26 facing the disc portion 17, It is possible to secure the non-contact seal portions 31, 32 with 27.

Next, another embodiment of the sealing device according to the present invention will be described with reference to the drawings.
FIG. 4 is a diagram schematically showing an example of the sealing device according to the second embodiment.
The differences from the first embodiment will be mainly described, and the same reference numerals will be given to the same configurations, and the description thereof will be omitted or briefly described.
In addition, the sealing device 9A according to the present embodiment is also mounted on the bearing device 1 configured by the inner ring 4 as the inner member and the outer ring 5 as the outer member, which relatively rotate coaxially, as in the above, to configure the bearing device 1. To do.

The seal device 9A according to the present embodiment is mainly different from the first embodiment in the configuration of the second elastic member 25A of the second seal member 20A.
In the present embodiment, the elastic base portion 26A of the second elastic member 25A is not provided with the recess 26a. That is, in the present embodiment, the surfaces of the elastic disc portion 27, the elastic base portion 26A, and the inner end covering portion 28 of the second seal member 20A facing the sealed space 6 side are chamfered portions of the inner end covering portion 28 described above. It is made flush with the exception of.
Also in the sealing device 9A according to the present embodiment having the above-described configuration and the bearing device 1 including the sealing device 9A, substantially the same effects as the above-described first embodiment are achieved.

Next, still another embodiment of the sealing device according to the present invention will be described with reference to the drawings.
FIG. 5: is a figure which shows typically an example of the sealing device which concerns on 3rd Embodiment.
The differences from the above-described embodiments will be mainly described, and the same configurations will be denoted by the same reference numerals, and the description thereof will be omitted or briefly described.
In addition, the sealing device 9B according to the present embodiment is also mounted on the bearing device 1 configured by the inner ring 4 as the inner member and the outer ring 5 as the outer member, which relatively rotate coaxially, in the same manner as described above, and configures the bearing device 1. To do.

In the sealing device 9B according to the present embodiment, the first seal member 10A is attached to the outer ring 5 and the second seal member 20B is attached to the inner ring 4. That is, in the present embodiment, unlike the above embodiments, one member to which the first seal member 10A is attached is the outer ring 5 and the other member to which the second seal member 20B is attached is the inner ring 4.
The first seal member 10A has a structure in which a first elastic member 15A formed of an elastic material similar to the above is fixed to a first core metal 11A formed of a metal material similar to the above. The second seal member 20B is configured such that a second core member 21A made of the same metal material as described above is fixed to a second elastic member 25B made of the same elastic material as described above.
The first cored bar 11A is fitted to the inner peripheral surface 5b of the outer ring 5 and is continuous with the cored bar cylindrical portion 12A forming the first cylindrical part and the end portion of the cored bar cylindrical part 12A on the external space side. And a metal core disc portion 13A provided in an annular shape so as to protrude from the portion toward the axial center side.

The first elastic member 15A is provided so as to cover the inner peripheral surface of the cored bar cylindrical section 12A of the first cored bar 11A, and the elastic cylindrical section 16A that constitutes the first cylindrical section and the elastic cylindrical section 16A covered by the elastic cylindrical section 16A. An elastic disk portion 17A that is continuous with the end portion on the side of the seal space 6 and that is annularly provided so as to project from the end portion toward the axial center side and that constitutes a first disk portion is provided. Similar to the above, the elastic disc portion 17A is a disc portion having elasticity which is mainly elastically deformed when the first seal member 10A and the second seal member 20B are combined so as to move in the axial 2 direction. Configure (see FIG. 5B). Further, the first elastic member 15A includes an inner end covering portion 18A provided so as to cover an end portion of the cored bar cylindrical portion 12A of the first cored bar 11A on the sealed space 6 side. Further, the elastic disc portion 17A is provided so as to be located closer to the external space than the inner end covering portion 18A. Further, the thickness dimension of the elastic cylindrical portion 16A along the radial direction of the sealed space 6 side of the elastic disk portion 17A is the radial thickness of the portion forming the groove bottom surface of the groove portion 30 of the elastic cylindrical portion 16A. The inner end covering portion 18A is provided so as to be continuous with the sealed space 6 side portion. Further, the inner peripheral surface of the elastic cylindrical portion 16A forming the groove bottom surface of the groove portion 30 is provided so as to be substantially in the radial direction at a position substantially coincident with the tip end surface of the cored bar disc portion 13A.

Further, the elastic disc portion 17A extends in the axial 2 direction while facing the outer peripheral surface of the second elastic member 25B, which is a portion where the tip end in the protruding direction which is the peripheral end portion thereof, faces the sealed space 6 side. The fifth non-contact seal portion 35 is formed as a non-contact seal portion that opens. The projecting dimension H of the elastic disc portion 17A is substantially the same as the above, in the state where the first seal member 10A and the second seal member 20B are attached to the outer ring 5 and the inner ring 4, the tip end portion and the second elastic member 25B. It may have an appropriate size so that the fifth non-contact seal portion 35 is formed between the outer peripheral surface and the outer peripheral surface.
Further, in the present embodiment, the first elastic member 15A is provided in an annular shape so as to be continuous with the end portion of the elastic cylindrical portion 16A on the external space side and project from the end portion toward the axial center side. The elastic disk portion 19 that constitutes the portion is provided. That is, in the present embodiment, both the elastic disc portion 17A and the elastic disc portion 19 which form the first disc portion and the second disc portion of the first seal member 10A are formed of the elastic material. There is.

The elastic disc portion 19 is provided so as to cover the tip portion of the core metal disc portion 13A of the first core metal 11A and extend from the tip portion of the core metal disc portion 13A toward the axial center side. Has been. That is, in the present embodiment, instead of the aspect in which the non-contact seal portion is configured by the portion facing the tip portion of the core metal disc portion 13A of the first core metal 11A, the tip portion of this elastic disc portion 19 A configuration in which the first non-contact seal portion 31 as a non-contact seal portion that extends in the axis 2 direction and is open on the external space side is formed by the cored bar cylindrical portion 22A that constitutes the second cylindrical portion that faces this. It is said that. The projecting dimension of the elastic disc portion 19 is between the tip of the first seal member 10A and the second seal member 20B mounted on the outer ring 5 and the inner ring 4 and the outer peripheral surface of the cored bar cylindrical portion 22A. It may have an appropriate size so that the first non-contact seal portion 31 is formed.
Further, the elastic disc portion 19 is formed so that the cross-sectional shape viewed in the circumferential direction is line-symmetrical with the axis 2 direction center line as the axis of symmetry. Further, the elastic disc portion 19 has a substantially rectangular cross-sectional shape when viewed in the circumferential direction. That is, the elastic disc portion 19 is formed so as to extend toward the axis without being inclined in the direction of the axis 2.

Further, the protrusion dimension of the elastic disc portion 19 from the elastic cylindrical portion 16A (groove bottom surface of the groove portion 30) is larger than the protrusion dimension H of the elastic disc portion 17A from the elastic cylindrical portion 16A (groove bottom surface of the groove portion 30). I am trying.
Further, the thickness dimension of the elastic disc portion 19 along the axis 2 direction is set to be larger than the thickness dimension of the elastic disc portion 17A and the core metal disc portion 13A of the first core metal 11A along the axis 2 direction. .. The elastic disc portion 19 is configured to be less elastically deformable than the elastic disc portion 17A, and has higher rigidity than the elastic disc portion 17A.
The elastic disk portion 19 is provided such that the surface thereof facing the external space is flush with the surface of the core metal disk portion 13A of the first core metal 11A facing the external space. Further, the surfaces of the elastic disk portion 19 and the elastic disk portion 17A facing each other form the groove width direction both groove inner wall surfaces of the groove portion 30. That is, in the present embodiment, the first elastic member 15A defines the groove width direction both groove inner wall surfaces and the groove bottom surface of the groove portion 30. The groove portion 30 opens inward in the radial direction, which is the opposite side of the above-described embodiments, and is provided over the entire circumference of the first seal member 10A.

The second cored bar 21A is fitted to the outer peripheral surface 4b of the inner ring 4 and is continuous with the cored bar cylindrical portion 22A forming the second cylindrical part and the end of the cored bar cylindrical portion 22A on the sealed space 6 side. A cored bar disc portion 23A that is provided in an annular shape so as to project radially outward from the end portion and that constitutes a third disc portion is provided.
The core metal cylindrical portion 22A has an end surface facing the external space side when the first seal member 10A and the second seal member 20B are attached to the outer ring 5 and the inner ring 4, and the core metal disc portion 13A of the first seal member 10A. In addition, the elastic disk portion 19 is arranged so as to be substantially flush with the surface of the elastic disk portion 19 facing the external space. In the present embodiment, the outer peripheral surface of the cored bar cylindrical portion 22A, the surface of the cored bar disk portion 23A facing the external space side, and the tip end surface are exposed without being covered by the second elastic member 25B.

In the present embodiment, the core metal disc portion 23A is arranged so as not to overlap the core metal disc portion 13A of the first seal member 10A when viewed in the axis 2 direction. Further, the cored bar disc portion 23A is configured to be inserted into the groove portion 30 of the first seal member 10A, in substantially the same manner as described above. That is, in the present embodiment, the third disc portion inserted into the groove 30 of the first seal member 10A is the core disc portion 23A made of a metal material. Further, in a state where the core metal disc portion 23A is inserted into the groove portion 30, the inner wall surfaces of the groove on both sides of the core metal disc portion 23A in the axis 2 direction and on both sides of the groove portion 30 of the first seal member 10A in the groove width direction are formed. The elastic disc portion 17A and the elastic disc portion 19 are opposed to each other, and the second non-contact seal portion 32 and the fourth non-contact seal portion 34 extending in the radial direction are formed. Further, with the core metal disc portion 23A inserted in the groove portion 30, the tip end portion of the core metal disc portion 23A and the elastic cylindrical portion 16A forming the groove bottom surface of the groove portion 30 of the first seal member 10A are opposed to each other. And a third non-contact seal portion 33 extending in the axial direction 2 is formed.

Further, in a similar manner to the above, the tip end portion of the core metal disc portion 23A and the tip end portion of the elastic disc portion 17A of the first seal member 10A are arranged so as to overlap each other when viewed in the axial 2 direction. ing. Further, the tip end portion of the core metal disc portion 23A and the elastic disc portion 17A and the elastic disc portion 19 of the first seal member 10A overlap with each other over the entire circumference when viewed in the axial 2 direction, substantially in the same manner as described above. It is arranged as follows. Further, in a manner similar to the above, the sum of the thickness dimension T of the core metal disc portion 23A and the protrusion dimension H of the elastic disc portion 17A of the first seal member 10A is the groove width dimension W of the groove portion 30. Smaller than.
In addition, the thickness T of the core metal disc portion 23A and the projection size of the core metal cylindrical portion 22A from the outer peripheral surface are similar to those described above, when the first seal member 10A and the second seal member 20B are attached to the outer ring 5 and the inner ring 4. In the mounted state, the non-contact seal portions 32, 33, 34 are formed between the two axial ends of the core metal disc portion 23A and between the tip portion and both groove inner wall surfaces and the groove bottom surface of the groove portion 30. It may have an appropriate size.

In the present embodiment, the second elastic member 25B is provided so as to cover the surface of the core metal disc portion 23A at the base end side in the protruding direction facing the sealed space 6 side, and the first seal member described above. A fifth non-contact seal portion 35 is formed by the tip end portion of the elastic disc portion 17A of 10A. Further, the second elastic member 25B constitutes a second cylindrical portion, and is provided in an annular shape so as to project from the base end side portion of the cored bar disc portion 23A toward the sealed space 6 side. Further, the second elastic member 25B is provided such that the inner peripheral surface thereof is flush with the inner peripheral surface of the cored bar cylindrical portion 22A. The dimension of the second elastic member 25B along the direction of the axis 2 is such that the surface facing the sealed space 6 side is the first when the first seal member 10A and the second seal member 20B are attached to the outer ring 5 and the inner ring 4. The elastic member 17A of the seal member 10A may be appropriately dimensioned so as to be positioned on the sealed space 6 side in the axial 2 direction with respect to the surface facing the sealed space 6 side. In the illustrated example, the surface of the second elastic member 25B facing the sealed space 6 is the first seal member 10A with the first seal member 10A and the second seal member 20B attached to the outer ring 5 and the inner ring 4. The inner end coating portion 18A is positioned substantially flush with the surface of the inner end covering portion 18A facing the sealed space 6 side. Further, the dimension of the second elastic member 25B along the radial direction is such that the elastic disc portion of the first seal member 10A is in a state where the first seal member 10A and the second seal member 20B are mounted on the outer ring 5 and the inner ring 4. It may have an appropriate size so that the fifth non-contact seal portion 35 is formed between the tip portion of 17A and the tip portion.

In the sealing device 9B according to the present embodiment having the above-described configuration, if the first seal member 10A and the second seal member 20B are attached to the outer ring 5 and the inner ring 4, the outer space and the sealed space 6 are substantially the same as above. A labyrinth seal is formed that communicates with and. Also in the present embodiment, the gap size of the labyrinth seal when viewed in the circumferential direction is set to be substantially uniform over the entire space from the external space to the sealed space 6.
Further, in the present embodiment, the first non-contact seal portion 31 forming the opening of the labyrinth seal on the outer space side is formed so as to open on the inner ring 4 side as compared to the first embodiment. Further, the second non-contact seal portion 32 is formed so as to be continuous with the sealed space 6 side of the first non-contact seal portion 31 and extend outward in the radial direction. Further, the third non-contact seal portion 33 is formed so as to be continuous to the outside in the radial direction of the second non-contact seal portion 32 and extend toward the sealed space 6 side. Further, the fourth non-contact seal portion 34 is formed so as to be continuous with the sealed space 6 side of the third non-contact seal portion 33 and extend toward the axial center side. Further, a fifth non-contact seal portion 35 is formed so as to be continuous with the axial center side of the fourth non-contact seal portion 34 and extend toward the sealed space 6 side. Further, a fifth non-contact seal portion 35 forming an opening of the labyrinth seal on the sealed space 6 side is formed so as to open at a substantially central portion in the radial direction between the inner ring 4 and the outer ring 5.
The sealing device 9B according to the present embodiment having the above-described configuration and the bearing device 1 including the sealing device 9B also have substantially the same effects as those of the above-described first embodiment.

Next, still another embodiment of the sealing device according to the present invention will be described with reference to the drawings.
FIG. 6 is a diagram schematically showing an example of the sealing device according to the fourth embodiment.
The differences from the above-described embodiments will be mainly described, and the same configurations will be denoted by the same reference numerals, and the description thereof will be omitted or briefly described.
In addition, the sealing device 9C according to the present embodiment is also mounted on the bearing device 1 configured by the inner ring 4 as the inner member and the outer ring 5 as the outer member that rotate relatively coaxially, as in the above, to configure the bearing device 1. To do.

In the sealing device 9C according to the present embodiment, the first sealing member 10B is attached to the outer ring 5 and the second sealing member 20C is attached to the inner ring 4, as in the third embodiment. ..
The first cored bar 11B of the first seal member 10B is fitted to the inner peripheral surface 5b of the outer ring 5 and forms a first cylindrical part, and a cored bar cylindrical part 12B and an end of the cored bar cylindrical part 12B on the outer space side. And a metal core disc portion 13B which is provided in an annular shape so as to project from the end portion toward the axial center side and which constitutes a second disc portion. That is, in the present embodiment, unlike the third embodiment, as in the first and second embodiments, the cored bar disc portion 13B partitions the labyrinth seal. The core metal disc portion 13B is a first non-contact seal portion that extends in the axis 2 direction and faces the outer peripheral surface 4b of the inner ring 4 that is a portion where the tip end in the protruding direction that is the peripheral end portion thereof faces. The contact seal portion 31 is formed. In the illustrated example, the C-chamfered chamfered portion is provided on the outer peripheral surface 4b of the inner ring 4, which is the portion where the tip end of the core metal disc portion 13B is opposed. It is not limited to the mode.
In addition, the projecting dimension along the radial direction of the cored bar disc portion 13B is such that the first non-contact portion between the tip portion and the outer peripheral surface 4b of the inner ring 4 is the state where the first seal member 10B is mounted on the outer ring 5. It may have an appropriate size so that the contact seal portion 31 is formed.

The first elastic member 15B of the first seal member 10B is provided so as to cover the inner peripheral surface of the cored bar cylindrical section 12B of the first cored bar 11B, and the elastic cylindrical section 16B constituting the first cylindrical section, An elastic disc portion 17B which is connected to the end of the elastic cylindrical portion 16B on the sealed space 6 side and which is annularly provided so as to project from the end toward the axial center side and which constitutes the first disc portion; I have it. Further, the first elastic member 15B includes an inner end covering portion 18B provided so as to cover an end portion of the cored bar cylindrical portion 12B of the first cored bar 11B on the sealed space 6 side. Further, in the present embodiment, the elastic disk portion 17B is provided so as to project from the end portion of the elastic cylindrical portion 16B on the sealed space 6 side and the inner end covering portion 18B toward the axial center side. Further, the surface of the inner end covering portion 18B facing the sealed space 6 side and the surface of the elastic disk portion 17B facing the sealed space 6 side are flush with each other.
Further, the elastic disc portion 17B extends in the axial 2 direction by facing the outer peripheral surface of the elastic base portion 26B of the second elastic member 25C, which is a portion where the tip end in the projecting direction which is the peripheral end portion thereof, faces and is sealed. A fifth non-contact seal portion 35 is formed as a non-contact seal portion that opens on the space 6 side. The projecting size of the elastic disk portion 17B is similar to that described above, in the state where the first seal member 10B and the second seal member 20C are attached to the outer ring 5 and the inner ring 4, the tip end portion and the second elastic member 25C. It may have an appropriate size so that the fifth non-contact seal portion 35 is formed between the outer peripheral surface of the elastic base portion 26B.

The second cored bar 21B of the second seal member 20C is fitted to the outer peripheral surface 4b of the inner ring 4 and forms a second cylindrical part, and the cored bar cylindrical part 22B and the sealed space 6 side of the cored bar cylindrical part 22B. The metal core disc portion 23B is provided in an annular shape so as to be continuous with the end portion and project radially outward from the end portion. The core metal disc portion 23B has an elastic circle of the first seal member 10B whose surface facing the sealed space 6 side when the first seal member 10B and the second seal member 20C are attached to the outer ring 5 and the inner ring 4. The plate portion 17B is arranged so as to be substantially flush with the surface of the plate portion 17B facing the sealed space 6 side.
The second elastic member 25C of the second seal member 20C is provided so as to cover the inner peripheral surface of the cored bar cylindrical portion 22B of the second cored bar 21B and the surface of the cored bar disk portion 23B facing the outer space side. The elastic base portion 26B that constitutes the second cylindrical portion and the outer space side end portion of the elastic base portion 26B are provided in an annular shape so as to project radially outward from the end portion, and the third disk portion The elastic disk part 27A which comprises is comprised. In addition, the second elastic member 25C includes an outer end covering portion 28A provided so as to cover the end portion of the core metal cylindrical portion 22B of the second core metal 21B on the external space side. In addition, the second elastic member 25C includes a tip covering portion 29A that is provided so as to cover the radially outer end of the cored bar portion 23B of the second cored bar 21B.

The elastic base portion 26B is provided such that the surface facing the external space is flush with the surface of the outer end covering portion 28A facing the external space. Further, the elastic base portion 26B is provided such that the outer peripheral surface thereof is flush with the outer peripheral surface of the tip covering portion 29A.
The elastic disc portion 27A is configured to be inserted into the groove portion 30 of the first seal member 10B, as in the first and second embodiments. The tip end portion of the elastic disc portion 17B of the first seal member 10B is opposed to the outer peripheral surfaces of the elastic base portion 26B and the tip covering portion 29A on the sealed space 6 side of the elastic disc portion 27A. The elastic disk portion 27A is provided such that the surface thereof facing the external space is slightly closer to the sealed space 6 side than the surfaces of the elastic base portion 26B and the outer end covering portion 28A facing the external space side. There is. With the elastic disc portion 27A inserted into the groove portion 30, in a radial direction between the elastic disc portion 27A on both sides in the axial 2 direction and the groove inner wall surfaces on both sides in the groove width direction in a similar manner to the above. A second non-contact seal part 32 and a fourth non-contact seal part 34 extending in the axial direction, and a third non-contact seal part extending in the axial 2 direction between the tip of the elastic disc part 27A and the groove bottom surface of the groove part 30. 33 is formed. Further, the second non-contact seal portion 32 is also formed so as to be continuous between the elastic base portion 26B provided so as to be continuous with the axial center side of the elastic disc portion 27A and the core metal disc portion 13B.

Further, in the present embodiment, the elastic disc portion 27A has elasticity that is mainly elastically deformed when the first seal member 10B and the second seal member 20C are combined so as to move in the axial 2 direction with respect to each other. It is assumed that the disk portion is configured (see FIG. 6B). The thickness dimension of the elastic disc portion 27A along the axis 2 direction is smaller than the dimension of the fifth non-contact seal portion 35 along the radial direction.
In addition, when the elastic disc portion 17B of the first seal member 10B described above is moved in the axial 2 direction with respect to each other and the first seal member 10B and the second seal member 20C are combined, The rigidity of the second seal member 20C is higher than that of the elastic disk portion 27A so that it is less likely to be elastically deformed than the elastic disk portion 27A.
Further, in this embodiment, the protruding dimension H1 of the elastic disk portion 27A is smaller than the groove width dimension W of the groove portion 30. That is, in a manner similar to the above, as shown in FIG. 6B, when the first seal member 10B and the second seal member 20C are combined so as to move in the axial 2 direction, the first seal member 10B The groove width dimension W of the groove portion 30 is set to the protrusion dimension H1 of the elastic disc portion 27A so that the elastic disc portion 27A of the second seal member 20C that elastically deforms so as to fall down by the elastic disc portion 17B can be restored. Is greater than. When the elastic disc portion 17B of the first seal member 10B is made of an elastic material as in this embodiment, the elastic disc portion of the first seal member 10B is substantially the same as above. The dimensions H1 and W may be set in consideration of the deformation of 17B.

In the sealing device 9C according to the present embodiment having the above-mentioned configuration, if the first seal member 10B and the second seal member 20C are attached to the outer ring 5 and the inner ring 4, the outer space and the sealed space 6 are substantially the same as above. A labyrinth seal is formed that communicates with and. Also in the present embodiment, the gap size of the labyrinth seal when viewed in the circumferential direction is set to be substantially uniform over the entire space from the external space to the sealed space 6. In the illustrated example, the clearance dimension of the second non-contact seal portion 32 formed between the elastic base portion 26B and the core metal disc portion 13B is formed between the elastic disc portion 27A and the core metal disc portion 13B. An example is shown in which the gap size of the second non-contact seal portion 32 is made slightly smaller.
Further, in the present embodiment, the first non-contact seal portion 31 forming the opening on the outer space side of the labyrinth seal is formed so as to open along the outer peripheral surface 4b of the inner ring 4. The non-contact seal parts 32, 33, 34, 35 other than the first non-contact seal part 31 are formed in substantially the same manner as in the third embodiment.
The sealing device 9C according to the present embodiment configured as described above and the bearing device 1 including the sealing device 9C also have substantially the same effects as the above-described first embodiment.

Next, still another embodiment of the sealing device according to the present invention will be described with reference to the drawings.
FIG. 7 is a diagram schematically showing an example of the sealing device according to the fifth embodiment.
The differences from the above-described embodiments will be mainly described, and the same configurations will be denoted by the same reference numerals, and the description thereof will be omitted or briefly described.
In addition, the sealing device 9D according to the present embodiment is also mounted on the bearing device 1 including the inner ring 4 as the inner member and the outer ring 5 as the outer member, which relatively coaxially rotate, similarly to the above, and constitutes the bearing device 1. To do.

In the sealing device 9D according to the present embodiment, the first sealing member 10C is attached to the outer ring 5 and the second sealing member 20D is attached to the inner ring 4, as in the third embodiment. ..
Further, in the present embodiment, similar to the third embodiment described above, the inner peripheral surface of the cored bar cylindrical portion 12C and the second disc part that configure the first cylindrical part of the first cored bar 11C of the first seal member 10C. The first elastic member 15C is provided so as to cover the surface of the cored bar disk portion 13C constituting the above which faces the sealed space 6 side. Also in the present embodiment, the first elastic member 15C is connected to the end portion of the elastic cylindrical portion 16C forming the first cylindrical portion on the sealed space 6 side, and is covered by the cored bar cylindrical portion 12C of the first cored bar 11C. An inner end covering portion 18C provided so as to cover the end portion on the seal space 6 side is provided. Further, in the present embodiment, the elastic disc portion 17C forming the first disc portion is provided so as to project from the end portion of the inner end covering portion 18C on the sealed space 6 side toward the axial center side. There is. Further, the groove bottom surface of the groove portion 30 is divided by the elastic cylindrical portion 16C and the inner end covering portion 18C. In other words, the elastic cylindrical portion 16C is provided so as to extend to the sealed space 6 side from the cored bar cylindrical portion 12C.

Further, the elastic disc portion 17C has elasticity that mainly elastically deforms when the first seal member 10C and the second seal member 20D are combined so as to move in the axial 2 direction, as in the third embodiment. The disk part that has this is configured (see FIG. 7B). Further, in the present embodiment, the non-contact seal portion is not formed by the tip portion of the elastic disc portion 17C and the portion facing the tip portion. That is, the facing object that constitutes the non-contact seal portion is not arranged on the tip side of the tip of the elastic disc portion 17C.
Further, the first elastic member 15C is provided with an elastic disc portion 19A that constitutes a second disc portion by the core metal disc portion 13C. The elastic disc portion 19A is continuous from the end of the elastic cylindrical portion 16C on the side of the outer space, and is provided so as to cover the surface of the core disc portion 13C facing the sealed space 6 side and the tip portion. Further, similar to the third embodiment, the tip end portion of the elastic disc portion 19A and the cored bar cylindrical portion 22C forming the second cylindrical portion as a portion facing the elastic disc portion 19A extend in the axis 2 direction to form an external space. The first non-contact seal portion 31 having an opening on the side is formed. Further, in the present embodiment, the outer space side portion of the tip end portion of the elastic disc portion 19A is configured to protrude toward the axial center side from the sealed space 6 side portion. That is, a stepped portion is provided at the tip of the elastic disc portion 19A.

In the present embodiment, the second seal member 20D is composed of only the second core metal 21C. That is, the second elastic member is not provided with the second elastic member.
The second cored bar 21C is fitted to the outer peripheral surface 4b of the inner ring 4 and is similar to the third embodiment, and the cored bar cylindrical portion 22C that constitutes the second cylindrical part and the cored bar cylindrical portion 22C is covered. A metal core disc portion 23C, which is connected to the end portion on the seal space 6 side and is provided in an annular shape so as to project radially outward from the end portion, and constitutes a third disc portion, is provided.
The cored bar disc portion 23C is configured to be inserted into the groove portion 30 of the first seal member 10C, similar to the above. In a state in which the core metal disc portion 23C is inserted into the groove portion 30, substantially the same as above, between the shaft 2 direction both sides of the core metal disc portion 23C and the groove inner wall surfaces of the groove portion 30 both sides in the groove width direction. A second non-contact seal part 32 and a fourth non-contact seal part 34 extending in the radial direction are formed, and a third non-contact part extending in the axis 2 direction is provided between the tip of the core metal disc part 23C and the groove bottom surface of the groove part 30. The contact seal portion 33 is formed.

In the sealing device 9D according to the present embodiment having the above-described configuration, if the first seal member 10C and the second seal member 20D are attached to the outer ring 5 and the inner ring 4, the outer space and the sealed space 6 are substantially the same as above. A labyrinth seal is formed that communicates with and. In the present embodiment, as described above, the step portion is provided at the tip of the elastic disc portion 19A, and the dimension of the first non-contact seal portion 31 on the sealed space 6 side in the radial direction is the first. It is configured to be larger than the dimension along the radial direction of the external space side portion of the 1 non-contact seal portion 31. The dimension of the first non-contact seal portion 31 along the radial direction of the external space side portion, the dimension of the second non-contact seal portion 32 along the axial 2 direction, and the dimension of the third non-contact seal portion 33 along the radial direction. Are approximately the same size. Further, the dimension of the fourth non-contact seal portion 34 along the axis 2 direction is slightly smaller than the dimension of the second non-contact seal portion 32 along the axis 2 direction. Further, in the present embodiment, a labyrinth seal having a path substantially similar to that of the third embodiment is formed except that the fifth non-contact seal portion is not formed. That is, in the present embodiment, the labyrinth seal is configured such that the opening (the fourth non-contact seal portion 34) on the sealed space 6 side is opened not in the axial direction 2 but in the radial direction (radially inside).
The sealing device 9D according to the present embodiment having the above-described configuration and the bearing device 1 including the sealing device 9D also have substantially the same effects as the above-described first embodiment.

The different configurations of the sealing devices 9 and 9A to 9D according to the above-described embodiments may be appropriately rearranged or combined to be applied.
In each of the above embodiments, the elastic disk portions 17, 17A, 17B, 17C that form the first disk portion, the elastic disk portion 19 that forms the second disk portion, and the third disk portion are formed. An example is shown in which the cross-sectional shape of the elastic disc portions 27, 27A that are viewed in the circumferential direction is a substantially rectangular shape, but the present invention is not limited to such an aspect. For example, the cross-sectional shape of these elastic disk portions 17, 17A, 17B, 17C, 19, 27, 27A viewed in the circumferential direction is a triangular shape so that the cross-sectional shape is a line-symmetrical shape with the axis 2 direction centerline as the axis of symmetry. Alternatively, it may have an isosceles trapezoidal shape or the like, or may have a shape in which recesses or protrusions are symmetrically provided on both sides in the axial direction.
Further, the first seal member 10, 10A to 10C and the second seal member 20, 20A to 20D do not have a substantially uniform cross-sectional shape over the entire circumference, but are, for example, elastic circles forming the first disc portion. Plates 17, 17A, 17B, 17C, metal core discs 13, 13B, 13C and elastic discs 19, 19A forming the second disc, and elastic discs forming the third disc. A notch-shaped recess or the like may be provided in a part of the circumferential direction of at least one of the disk portions 27, 27A and the core metal disk portions 23A, 23C.

Further, in each of the above-described embodiments, the first disc portion 17, 17A, 17B, 17C, the second disc portion 13, 13B, 13C, 19, 19A, and the third disc portion 27, 27A, 23A, 23C. An example is shown in which at least one of the disc parts includes a disc part formed of a metal material. However, instead of such an aspect, a first disc part and a second disc part are shown. All the parts and the third disk part may be made of an elastic material. The specific configurations of the first sealing members 10, 10A to 10C and the second sealing members 20, 20A to 20D configuring the sealing devices 9, 9A to 9D according to the above-described embodiments are not limited to the above-mentioned examples, and others. Various modifications are possible.

1 Bearing device 4 Inner ring (inner member)
5 Outer ring (outer member)
6 Space to be sealed 9, 9A to 9D Sealing device 10, 10A to 10C First sealing member 12, 12A to 12C Core bar cylindrical portion (first cylindrical portion)
13, 13B, 13C core metal disc part (second disc part)
16, 16A to 16C Elastic cylindrical portion (first cylindrical portion)
17, 17A to 17C Elastic disc part (first disc part)
19, 19A elastic disk part (second disk part)
20, 20A to 20D Second seal member 22, 22A to 22C Core bar cylindrical portion (second cylindrical portion)
23A, 23C core disc part (third disc part)
25B Second elastic member (second cylindrical portion)
26, 26A, 26B Elastic base (second cylindrical portion)
27,27A elastic disc part (third disc part)
30 Groove 31 First non-contact seal part (non-contact seal part extending in the axial direction)
32 Second non-contact seal part (radial direction non-contact seal part)
33 Third non-contact seal part (non-contact seal part extending in the axial direction)
34 Fourth non-contact seal part (radial direction non-contact seal part)
35 Fifth non-contact seal portion (non-contact seal portion extending in the axial direction)
H Projecting dimension of the 1st disk part T Thickness dimension of the 3rd disk part W Groove width dimension of the groove part

Claims (9)

A first seal member attached to one member of the inner member and the outer member that relatively rotate coaxially; and a second seal member attached to the other member,
The first seal member is provided so as to protrude in the radial direction from a first cylindrical portion fitted to the one member and a portion spaced apart in the axial direction of the first cylindrical portion. A second cylinder part fitted to the other member, and a second disk part, and a second disk part, and a second cylinder part protruding from the second cylinder part in a radial direction. And a third disc part inserted into a groove part defined by the first cylindrical part, the first disc part and the second disc part of the first seal member,
The first disc part is a disc part having elasticity, and the third disc part is insertable into the groove part with elastic deformation of the disc part,
A labyrinth seal for communicating a sealed space between the inner member and the outer member with an outer space in a state where the first seal member and the second seal member are mounted on the inner member and the outer member. A plurality of non-contact seal portions extending in the axial direction and a plurality of non-contact seal portions extending in the radial direction are alternately formed ,
The groove width dimension along the axial direction of the groove portion is obtained by adding the projection dimension of the first disc portion from the first cylindrical portion and the thickness dimension of the third disc portion along the axial direction. Sealing device characterized by being also large . A first seal member attached to one member of the inner member and the outer member that relatively rotate coaxially; and a second seal member attached to the other member,
The first seal member is provided so as to protrude in the radial direction from a first cylindrical portion fitted to the one member and a portion spaced apart in the axial direction of the first cylindrical portion. A second cylinder part fitted to the other member, and a second disk part, and a second disk part, and a second cylinder part protruding from the second cylinder part in a radial direction. And a third disc part inserted into a groove part defined by the first cylindrical part, the first disc part and the second disc part of the first seal member,
The third disc portion is a disc portion having elasticity and can be inserted into the groove portion with elastic deformation,
A labyrinth seal for communicating a sealed space between the inner member and the outer member with an outer space in a state where the first seal member and the second seal member are mounted on the inner member and the outer member. A plurality of non-contact seal portions extending in the axial direction and a plurality of non-contact seal portions extending in the radial direction are alternately formed,
The groove width dimension along the axial direction of the groove portion is made larger than the projecting dimension of the third disc portion from the second cylindrical portion, and the thickness dimension along the axial direction of the third disc portion is: It is smaller than the dimension along the radial direction of the non-contact seal portion that extends in the axial direction and that is formed by the peripheral end portion of the first disc portion and the second cylindrical portion that face each other. Sealing device. In claim 1,
The thickness dimension along the axial direction of the first circular plate portion is equal to that of the non-contact seal portion extending in the axial direction formed by facing the peripheral end portion of the third circular disk portion and the first cylindrical portion. A sealing device characterized by being smaller than the dimension along the radial direction. In any one of Claim 1 thru|or 3 ,
In a state where the third disc portion is inserted into the groove, both axial sides of the third disc portion and the first disc portion and the second disc portion are opposed to each other and extend in the radial direction. A non-contact seal portion is formed, and a peripheral end portion of the third disc portion and the first cylindrical portion are opposed to each other to form a non-contact seal portion extending in the axial direction. And a sealing device. In any one of Claim 1 thru|or 4 ,
A peripheral end portion of the first disc portion and a peripheral end portion of the second disc portion are opposed to a portion where they are opposed to each other to form a non-contact seal portion extending in the axial direction. Sealing device characterized by being In any one of Claim 1 thru|or 5 ,
In the first disc portion, the projecting dimension from the first cylindrical portion is smaller than the projecting dimension of the second disc portion from the first cylindrical portion,
A sealing device, wherein a peripheral end portion of the first disc portion and a peripheral end portion of the third disc portion are arranged so as to overlap each other when viewed in the axial direction. In any one of Claim 1 thru|or 6 ,
The peripheral end portion of the third disc portion and the first disc portion and the second disc portion are arranged so as to overlap each other over the entire circumference when viewed in the axial direction. Sealing device characterized by. In any one of Claims 1 thru|or 7 ,
The sealing device, wherein the elastic disk portion is formed so that a cross-sectional shape viewed in a circumferential direction is line-symmetrical with an axis of symmetry as an axis of symmetry. A bearing device comprising: an inner member and an outer member that relatively rotate coaxially; and the sealing device according to any one of claims 1 to 8 , which is attached to the inner member and the outer member.

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