Sealing device

Abstract

To provide a sealing device which can prevent a damage on a surface of a magnetized part without applying a load on a slinger member when a plurality of sealing devices are stacked.SOLUTION: A sealing device 10 is composed of a combination of a slinger member 11 provided with a magnetized part 14 and a core metal member 15. The core metal member includes: a cylindrical part 16; and a circular ring part 17 extending from an end part on the other side of the cylindrical part toward an inner diameter side. On the other side of the core metal member, a spacer part 27 having a spacer circular ring part 28 provided on a side face on the other side of the circular ring part and a projection part 29 extending on the other side from the end part on an outer diameter side of the spacer circular ring part. When a plurality of sealing devices are stacked in a coaxial direction, the projection part 29 is formed to project such that an end part 19a of the projection part comes into contact with an end part 16a of the cylindrical part of the adjacent sealing device, and a gap D is provided between the spacer circular ring part and the magnetized part of the adjacent sealing device.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sealing device. [Background technology]

[0002] Conventionally, a sealing device has been known in which a slinger member attached to the inner member of an outer member and an inner member that rotate coaxially relative to each other is provided with a magnetized portion that constitutes a magnetic encoder for detecting the rotational speed, etc., of the inner member. Such sealing devices are typically stacked and packaged for storage and transportation. However, when stacked with the magnetized portion abutting against the metal core member of an adjacent sealing device, the magnetized portion is attracted to the core member by magnetic force, making it difficult to separate. Furthermore, when the core member is stacked with the magnetized portion abutting against the surface of the magnetized portion, there is a concern that scratches, dents, etc. may occur on the surface of the magnetized portion.

[0003] Patent Document 1 listed below discloses a sealing device provided with protrusions (4a, 4b) that protrude beyond the side surface of the flange portion of the core metal member so that the core metal member of an adjacent sealing device does not come into contact with the magnetized portion (encoder 1 in Patent Document 1) when multiple sealing devices are stacked. Patent Document 2 listed below also discloses a sealing device that includes a slinger flange portion of a slinger that is fitted into an inner member, and a magnetized portion (magnetic encoder 17 in Patent Document 2) that is fixed to the inner diameter side of the outer diameter side end of the slinger flange portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4361258 [Patent Document 2] Patent No. 7279920 Summary of the Invention [Problem to be solved by the invention]

[0005] The sealing device disclosed in Patent Document 1 can reduce the contact area between the magnetized portion and the adjacent core member. However, there are still some areas where the magnetized portion abuts against the core member, which can lead to concerns about scratches on the surface of the magnetized portion. Furthermore, this configuration in which the magnetized portion abuts against the core member raises concerns about stability when multiple units are stacked.

[0006] According to the sealing device disclosed in Patent Document 2, when a plurality of sealing devices are stacked, the core metal flange does not come into contact with the magnetized portion but comes into contact with the outer diameter side end of the slinger flange, thereby preventing scratches on the surface of the magnetized portion. However, if the core metal member comes into contact with the slinger flange, there is a concern that the weight of the sealing device stacked above may be applied to the slinger depending on the shape of the slinger.

[0007] The present invention has been made in consideration of the above-mentioned situation, and aims to provide a sealing device that can prevent damage to the surface of the magnetized portion without applying load to the slinger member when multiple sealing devices are stacked. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the sealing device of the present invention is a sealing device constructed by combining a slinger member attached to an inner member that rotates coaxially relative to an outer member, and having a magnetized portion that constitutes a magnetic encoder on one axial side that is closer to the external space, and a core member attached to the outer member and arranged on the other axial side that is closer to the sealed space than the slinger member, wherein the core member has a cylindrical portion that is fitted to the inner surface of the outer member, and a circular ring portion that extends inward from the end of the other side of the cylindrical portion, and the other side of the core member is provided with a spacer portion that has a spacer circular ring portion that is arranged on the side of the other side of the circular ring portion, and a protrusion that extends to the other side from the end of the outer diameter side of the spacer circular ring portion, and the protrusion is formed to protrude so that when a plurality of the sealing devices are stacked coaxially, the end of the protrusion abuts the end of the cylindrical portion of an adjacent sealing device, and a gap is provided between the spacer circular ring portion and the magnetized portion of the adjacent sealing device. [Effects of the Invention]

[0009] Since the sealing device of the present invention has the above-described configuration, when multiple sealing devices are stacked, no load is applied to the slinger member, and damage to the surface of the magnetized portion can be prevented. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic vertical cross-sectional view showing an example of a bearing device to which a sealing device according to an embodiment of the present invention is attached. [Figure 2] 2 is an enlarged view of a portion Z in FIG. 1, and is a schematic vertical cross-sectional view that schematically shows the sealing device according to the present embodiment. FIG. [Figure 3] FIG. 2 is a schematic vertical cross-sectional view showing a plurality of the sealing devices stacked one on top of the other. [Figure 4] 10A and 10B are diagrams showing modified examples of the sealing device, and are schematic vertical cross-sectional views showing modified examples of the sealing device in which a plurality of the sealing devices are stacked. [Figure 5]10A and 10B are diagrams showing another modified example of the sealing device, in which (a) and (b) are a schematic vertical cross-sectional view and an enlarged view of a main part thereof, showing a modified example of the sealing device in which a plurality of devices are stacked. [Figure 6] 10A and 10B are diagrams showing a further modified example of the sealing device, in which (a) is a schematic vertical cross-sectional view showing a modified example of the sealing device, and (b) is a schematic vertical cross-sectional view showing a plurality of the above sealing devices stacked one on top of the other. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a sealing device according to an embodiment will be described with reference to the drawings. In some drawings, some of the detailed reference numerals used in other drawings are omitted. In addition, the two-dot chain lines shown in each drawing indicate the shapes of the seal lips 24, 25, and 26 before elastic deformation.

[0012] The sealing device 10 according to this embodiment is configured by combining a slinger member 11 attached to an inner member (5) that rotates coaxially relative to the outer member (2) and provided with a magnetized portion 14 constituting a magnetic encoder on one axial side facing the external space, and a core metal member 15 attached to the outer member (2) and disposed on the other axial side of the slinger member 11 closer to the sealed space S. The core metal member 15 includes a cylindrical portion 16 that fits into the inner circumferential surface 2b of the outer member (2) and a circular ring portion 17 that extends radially inward from the other end (19e) of the cylindrical portion 16. The other side of the core metal member 15 is provided with a spacer portion 27 that includes a spacer circular ring portion 28 that is disposed on the other side (20b) of the circular ring portion 17 and a protrusion 29 that extends radially outward from the outer end (28b) of the spacer circular ring portion 28. The protruding portion 29 is formed to protrude so that, when a plurality of the sealing devices 10 are stacked in the coaxial direction, the end 29a of the protruding portion 29 abuts against the end 16a of the cylindrical portion 16 of the adjacent sealing device 10, and a gap D is provided between the spacer ring portion 28 and the magnetized portion 14 of the adjacent sealing device 10. This will be described in detail below.

[0013] Fig. 1 shows an example of a bearing device 1 to which the sealing device of each embodiment is attached, and Fig. 2 and Fig. 3 show an example of a sealing device 10 according to the first embodiment. As shown in FIG. 1, bearing device 1 supports a wheel (not shown) of a vehicle such as an automobile so as to be rotatable about its axis. Bearing device 1 generally includes an outer ring 2, which corresponds to the outer member described above, an inner ring 5, which corresponds to the inner member described above, and two rows of rolling elements (balls) 6 interposed between the outer ring 2 and the inner ring 5. The inner ring 5 is made up of a hub ring 3 and an inner ring member 4, and the inner ring member 4 is fitted integrally with the vehicle body side of the hub ring 3. A drive shaft 7 is coaxially spline-fitted with the hub ring 3, and the drive shaft 7 is connected to a drive source (drive transmission unit) (not shown) via a constant velocity joint 8. The drive shaft 7 is integrated with the hub ring 3 by a nut 9, preventing the hub ring 3 from falling off the drive shaft 7. The inner ring 5 (hub ring 3 and inner ring member 4) is rotatable about axis L relative to the outer ring 2. The outer ring 2 and the inner ring 5 form two relatively rotatable members, forming an annular sealed space S. Within the sealed space S, two rows of rolling elements 6 are held by a retainer 6a, and the raceways 2a of the outer ring 2, the hub ring 3, and the raceways 3a, 4a of the inner ring member 4 are rollably interposed. The hub ring 3 has a cylindrical hub ring body 3b and a hub flange 3d formed to extend radially outward from the hub ring body 3b via a rising base portion 3c, and a wheel is attached and fixed to the hub flange 3d with bolts 3e and nuts (not shown).

[0014] The sealing device 10 is mounted between the outer ring 2 and the inner ring member 4, and seals the end of the sealed space S on the vehicle body side (one axial side). In addition, a sealing device 31 is mounted between the outer ring 2 and the hub wheel 3, and seals the end of the sealed space S on the wheel side (the other axial side). These seal both axial ends of the sealed space S, and prevent foreign matter such as muddy water from entering the sealed space S and prevent lubricant (grease, etc.) filled in the sealed space S from leaking to the outside.

[0015] As shown in Figure 2, the sealing device 10 that seals the vehicle body side of the sealed space S is composed of a slinger member 11 attached to the inner ring member 4 and provided with a magnetized portion 14 that constitutes a magnetic encoder, and a core metal member 15 attached to the outer ring 2 and arranged on the other axial side, which is closer to the sealed space S than the slinger member 11.

[0016] The slinger member 11 is an annular member, and is formed by pressing a steel plate such as SPCC or SUS into a generally L-shaped cross section on one side. The slinger member 11 includes a cylindrical slinger portion 12 that fits onto the outer peripheral surface 4b of the inner ring member 4, and a slinger ring portion 13 that extends radially outward from the vehicle-body-side end 12b of the cylindrical slinger portion 12. The magnetized portion 14 is formed of an elastic material such as rubber containing a magnetic powder or other magnetic material, or a hard synthetic resin, and is magnetized with alternating north and south poles in the circumferential direction. The magnetized portion 14 is fixed to cover substantially the entire vehicle-body-side side surface 13a of the slinger ring portion 13, and the vehicle-body-side side surface 14a, which is the detection surface, is positioned axially opposite a magnetic sensor 30 provided on the vehicle body, thereby forming a magnetic encoder that detects the rotational speed of the wheel, etc.

[0017] The core metal member 15 is an annular member and is formed by pressing a steel plate such as SPCC or SUS. The core metal member 15 includes a core metal 18, a seal portion 21, and a spacer portion 27. The core metal 18 has a core metal cylindrical portion 19 that is fitted onto the inner peripheral surface 2b of the outer ring 2, and a core metal ring portion 20 that extends radially inward from an end portion 19e of the core metal cylindrical portion 19 on the wheel side. A stepped portion 19d that is thinner than the other stepped portions is formed at the end portion on the vehicle body side of the outer peripheral surface 19b of the core metal cylindrical portion 19.

[0018] The seal portion 21 is formed from an elastic material such as NBR, H-NBR, ACM, AEM, or FKM, and is fixed to the core metal 18. The seal portion 21 has a seal cylindrical portion 22 fixed to the core metal cylindrical portion 19, a seal ring portion 23 fixed to the core metal circular ring portion 20, and a plurality of seal lips 24, 25, and 26 arranged to slide against the slinger member 11. The seal cylindrical portion 22 is fixed so as to cover the inner circumferential surface 19c of the core metal cylindrical portion 19 and a step portion 19d of the core metal cylindrical portion 19. The seal cylindrical portion 22 has an annular ridge 22a that protrudes radially outward beyond the outer circumferential surface 19b of the core metal cylindrical portion 19 and is compressed radially when the core metal member 15 is attached to the outer ring 2. The seal lip 24 is an axial lip that is formed to extend at an angle from the inner diameter side of the core metal ring portion 20 to the outer diameter side, and its tip portion 24a is formed to be in sliding contact with the slinger ring portion 13. The seal lip 25 is a radial lip that is formed on the inner diameter side of the seal lip 24, and its tip portion 25a is formed to be in sliding contact with the slinger cylindrical portion 12. The seal lip 26 is formed on the wheel side of the seal lip 25, and is inclined toward the wheel as it extends toward the inner diameter side, and is a so-called grease lip that is in sliding contact with the slinger cylindrical portion 12. Note that the number and shape of the seal lips 24, 25, 26, and whether or not they are in sliding contact are not limited to those shown in the figures.

[0019] In this embodiment, the cylindrical portion 16 of the core metal member 15 is composed of a core metal cylindrical portion 19 and a seal cylindrical portion 22, and the ring portion 17 of the core metal member 15 is composed of a core metal circular portion 20 and a seal circular portion 23. In addition, the end portion 16a of the cylindrical portion 16 of the core metal member 15 on the vehicle body side is covered by the seal cylindrical portion 22 and has a flat surface shape.

[0020] The spacer portion 27 is formed integrally with and continuous with the metal core 18, and includes a spacer ring portion 28 and a protrusion 29. The spacer ring portion 28 is folded back from an end 20a on the inner diameter side of the metal core ring portion 20 and extends toward the outer diameter side, with a vehicle body-side side 28a of the spacer ring portion 28 and a wheel-side side 20b of the metal core ring portion 20 overlapping each other. The spacer ring portion 28 is formed to have a smaller radial dimension than the metal core ring portion 20, and the outer diameter side end 28b of the spacer ring portion 28 is provided with a protrusion 29 that is bent at approximately 90 degrees toward the wheel side (the sealed space S side). The protrusion 29 is formed in a short cylindrical shape extending axially from the outer diameter side end 28b of the spacer ring portion 28, and an outer peripheral surface 29b of the protrusion 29 is formed to be located on the inner diameter side of the outer peripheral surface 19b of the metal core cylindrical portion 19. With this configuration, when the sealing device 10 is mounted on the bearing device 1, the core cylindrical portion 19 is fitted to the inner surface 2b of the outer ring 2, while the protruding portion 29 is not fitted to the inner surface 2b of the outer ring 2. Therefore, the sealing device 10 can be mounted as usual without having to worry about the presence of the protruding portion 29 when mounting.

[0021] The end 29a of the protrusion 29 is formed into a flat surface shape, and the length dimension of the spacer ring portion 28 is such that when a plurality of sealing devices 10 are stacked in the axial direction L' as shown in Fig. 3, the end 29a of the protrusion 29 is placed in contact with and opposed to the end 16a of the cylindrical portion 16 of the adjacent sealing device 10 in a substantially parallel manner. Since the end 29a of the protrusion 29 and the end 16a of the cylindrical portion 16 of the sealing device 10 are formed into a flat surface shape, a plurality of sealing devices 10 can be stacked in a stable state.

[0022] The sealing device 10 is formed so that the axial dimension X from the end 16a of the cylindrical portion 16 to the end 29a of the protruding portion 29 is larger than the axial dimension Y from the vehicle body side surface 14a of the magnetized portion 14 to the sealed space side end 12a of the slinger cylindrical portion 12. Also, the axial dimension X from the end 16a of the cylindrical portion 16 to the end 29a of the protruding portion 29 is formed so as to be larger than the axial dimension X1 from the vehicle body side surface 14a of the magnetized portion 14 to the wheel side surface 20b of the core metal ring portion 20. In other words, the protruding portion 29 is formed to protrude in the axial direction so that the axial dimension X from the end 16a of the cylindrical portion 16 to the end 29a of the protruding portion 29 is larger than the axial dimensions of other portions of the sealing device 10.

[0023] With this configuration, as shown in Fig. 3, when a plurality of sealing devices 10 are stacked in the coaxial direction L' during storage or transportation, a gap D can be provided between the spacer ring portion 28 and the magnetized portion 14 of an adjacent sealing device 10. Therefore, the end 29a of the protruding portion 29 of the spacer portion 27 provided on the other side of the core member 15 and the end 16a of the cylindrical portion 16 of the core member 15 of the adjacent sealing device 10 abut with the gap D provided, so when a plurality of sealing devices 10 are stacked, no load is applied to the slinger member 11, and there is no concern that the slinger member 11 will be deformed by the load of stacking. Furthermore, even if the sealing device 10 is provided with a seal lip 24 (axial lip) that slides against the slinger member 11, there is no concern that the seal lip 24 will be pushed in due to deformation of the slinger member 11. Furthermore, according to the above configuration, the protruding portion 29 is formed to protrude so as to provide a gap D between the spacer ring portion 28 and the magnetized portion 14 provided on the slinger member 11, so that it is possible to prevent the core metal member 15 and the magnetized portion 14 of the adjacent sealing device 10 from being attracted to each other by magnetic force, and it is possible to prevent damage to the side surface 14a on the vehicle body side, which is the surface of the magnetized portion 14. And, according to the above configuration, there is no need for a manufacturing process such as matte finishing on the contact portion with the magnetized portion 14 due to concerns about attraction by magnetic force, and the stacked sealing devices 10, 10 can be easily separated without being stuck to each other by magnetic force.

[0024] Next, a sealing device according to a modified example of the present embodiment will be described with reference to Fig. 4. In the following modified example, differences from the example described above will be mainly described, and the configurations and effects of the common parts will be omitted or briefly described.

[0025] FIG. 4(a) shows a sealing device 10A according to a modified example of this embodiment. This modified example differs from the above-described example in that the core 18 and the spacer portion 27 of the core member 15 are formed separately. The core 18 has a core ring portion 20 formed to have a smaller radial dimension than the spacer ring portion 28. The spacer portion 27 has an inner diameter end 28c of the spacer ring portion 28 located more inwardly than the inner diameter end 20a of the core ring portion 20, and the separately formed vehicle body side surface 28a of the spacer ring portion 28 and the wheel side surface 20b of the core ring portion 20 are fixed to each other. The method for fixing the core 18 and the spacer portion 27 is not particularly limited, and they may be fixed by welding, applying an adhesive, or the like. The seal portion 21 is provided to cover not only the inner diameter end 20a of the core ring portion 20 but also the inner diameter end 28c of the spacer ring portion 28. Even if the core metal 18 and the spacer portion 27 are separate in this way, the same effect as that of the sealing device 10 of the first embodiment can be achieved, and the above configuration also makes it possible to provide a double circular ring portion with the spacer circular ring portion 28 and the core metal circular ring portion 20, so that deformation of the core metal member 15 can be suppressed even if multiple units are stacked.

[0026] FIG. 4(b) shows a sealing device 10B according to a modified example of this embodiment. In this modified example, the core metal 18 and the spacer portion 27 are separate bodies, as in FIG. 4(a), but the length dimensions of the spacer ring portion 28 and the core metal ring portion 20 are different. The core metal ring portion 20 of the core metal 18 is formed to have a larger radial dimension than the spacer ring portion 28 of the spacer portion 27. The spacer portion 27 is fixed to the core metal 18 so that the inner diameter side end 28c of the spacer ring portion 28 overlaps with a radially intermediate portion of the core metal ring portion 20 when viewed in the axial direction. The seal portion 21 is fixed to cover the inner diameter side end 20a of the core metal ring portion 20, but the seal portion 21 is not fixed to the spacer portion 27. Even with the above configuration, the same effect as the sealing device 10 of the first embodiment is achieved, and the above configuration also makes it possible to provide a double circular ring portion consisting of the spacer circular ring portion 28 and the core metal circular ring portion 20, so that deformation of the core metal member 15 can be suppressed even when multiple units are stacked.

[0027] Next, sealing devices 10C and 10D according to further modifications of this embodiment will be described with reference to Fig. 5. In the following modifications, differences from the previously described examples will also be mainly described, and the configurations and effects of common parts will be omitted or briefly described. The modification shown in Fig. 5 is common to the sealing device 10 shown in Figs. 2 and 3 in that the spacer portion 27 is formed integrally with the core metal 18, but the configurations of the end 16a of the cylindrical portion 16 and the end 29a of the protruding portion 29 are different, and they are structured to engage with each other.

[0028] 5(a) has a protruding portion 29aa protruding from an end portion 29a of the protruding portion 29, and an engaging portion 16b with which the protruding portion 29aa is engaged at an end portion 16a of the cylindrical portion 16. The protruding portion 29aa is formed around the entire circumference on the outer diameter side of the protruding portion 29, and the engaging portion 16b is formed around the entire circumference on the outer diameter side of the cylindrical portion 16. The protruding portion 29aa is formed in an inclined shape tapering toward the tip in the protruding direction, and the engaging portion 16b is also formed in an inclined shape so as to match the inclined surface 29ab of the protruding portion 29aa and follow the inclined surface 29ab. With the above configuration, when multiple sealing devices 10C, 10C are stacked, the inclined surface 29ab of the protruding portion 29aa provided on the end portion 29a comes into contact with the locking portion 16b provided on the end portion 16a of the cylindrical portion 16 of the adjacent sealing device 10D, forming a concave-convex engagement structure in which they engage with each other. Furthermore, with the above configuration, the locking portion 16b is formed of the seal portion 21, i.e., an elastic material such as rubber, making it more difficult for the metallic protruding portion 29 and the elastic locking portion 16b to become disengaged. Therefore, even if a force is applied from the outside (in the direction of the hollow arrow in the enlarged view of FIG. 5(a)) when multiple sealing devices 10C, 10C... are stacked, the protruding portion 29aa comes into contact with and engages with the locking portion 16b, thereby preventing radial displacement of the sealing devices 10D.

[0029] The engagement structure between the protrusion 29aa and the locking portion 16b is not limited to that shown in Fig. 5(a). Fig. 5(b) shows another example of the engagement structure. The sealing device 10D shown in Fig. 5(b) differs from the example shown in Fig. 5(a) in the engagement structure between the protrusion 29aa and the locking portion 16b, and differs from the above-described embodiment and modified examples in that the seal portion 21 is not formed on the end portion 16a of the cylindrical portion 16 of the core metal member 15.

[0030] In the sealing device 10D, the seal portion 21 is fixed to cover a portion of the inner diameter side of the vehicle-body-side side surface 20c of the core metal ring portion 20 and wraps around the inner diameter end portion 20a of the core metal ring portion 20 to cover a portion of the inner diameter side of the wheel-side side surface 28d of the spacer ring portion 28. However, unlike the previous example, the seal portion 21 is not fixed to the core metal cylindrical portion 19. In other words, the cylindrical portion 16 of the core metal member 15 is formed only by the core metal cylindrical portion 19. A stepped portion 19d is formed on the outer diameter side of the vehicle-body-side end portion 19a of the core metal cylindrical portion 19 (the vehicle-body-side end portion 16a of the cylindrical portion 16). The stepped portion 19d differs from the stepped portion 19d shown in FIG. 2 in that the seal portion 21 is not provided and in that the stepped portion 19d has a flat abutting portion 19da against which the protrusion 29aa abuts. 5(a) in that the tip of the convex portion 29aa of the protrusion 29 is flat. With the above configuration, when a plurality of sealing devices 10D, 10D are stacked, the convex portion 29aa provided on the end portion 29a abuts against the abutting portion 19da of the end portion 16a of the adjacent sealing device 10D, forming a concave-convex engagement structure in which they engage with each other. Therefore, even if a force is applied from the outside (in the direction of the outline arrow in the enlarged view of FIG. 5(d)) when a plurality of sealing devices 10D, 10D... are stacked, the convex portion 29aa is locked by the step portion 19d, so that it is possible to prevent the sealing devices 10D from being displaced significantly in the radial direction and losing their engagement relationship.

[0031] Next, a sealing device 10E according to another modification of this embodiment will be described with reference to FIGS. 6(a) and 6(b). In the following modification, differences from the previously described example will be mainly described, and the configuration and effects of common parts will be omitted or briefly described. The modification shown in FIG. 6 shows an example in which a recess 2ba is formed on the inner peripheral surface 2b of the outer ring 2, and the inner peripheral surface 2b forms a stepped surface 2bb that narrows toward the inner diameter side toward the space in which the rolling elements 6 are disposed. This allows the spacer portion 27 to be configured even when there are restrictions on the fitting surface of the core metal member 15. The sealing device 10E differs from the sealing device 10 in that the outer peripheral surface 29b of the protruding portion 29 of the spacer portion 27 is formed further toward the inner diameter side than the outer peripheral surface 29b of the sealing device 10 shown in FIG. 2, so that the protruding portion 29 does not abut against the stepped surface 2bb when mounted on the bearing device 1. In addition, since the protrusion 29 is formed closer to the inner diameter than in the example of the sealing device 10, the thickness of the seal portion 21 covering the step portion 19d of the core metal cylindrical portion 19 is formed thicker, and the thickness of the end portion 16a of the cylindrical portion 16 is configured thicker than in the sealing device 10, which is also a difference from the sealing device 10, but otherwise it is similar to the sealing device 10.

[0032] In the above configuration, the end 29a of the protrusion 29 of the sealing device 10E and the end 16a of the cylindrical portion 16 are formed into a flat surface shape, so that multiple sealing devices 10 can be stacked in a stable state as shown in FIG. 6(b).

[0033] The different configurations described in the above embodiments and modifications may be modified, rearranged, or combined as needed. The sealing device is not limited to the above configuration. [Explanation of symbols]

[0034] 2 Outer ring (outer member) 3 Hub ring (inner part) 4 Inner ring member (inner member) 5 Inner ring (inner member) 10,10A~10E Sealing device 11 Slinger member 14 Magnetized part 15 Core metal member 16 Cylindrical part 16a End 17 Circular part 27 Spacer part 28 Spacer ring part 29 Protrusion 29a End D Gap S Sealed space

Claims

1. A sealing device comprising a slinger member attached to an inner member that rotates coaxially relative to an outer member, the slinger member having a magnetized portion that constitutes a magnetic encoder on one axial side that faces the external space, and a core metal member attached to the outer member and disposed on the other axial side that faces the sealed space relative to the slinger member, the core metal member includes a cylindrical portion fitted to an inner peripheral surface of the outer member, and a circular ring portion extending radially inward from the other end of the cylindrical portion, a spacer portion is provided on the other side of the core metal member, the spacer portion having a spacer ring portion disposed on a side surface of the other side of the ring portion and a protrusion portion extending from an end portion on an outer diameter side of the spacer ring portion to the other side, the protruding portion is formed to protrude so that, when a plurality of the sealing devices are stacked coaxially, an end of the protruding portion abuts against an end of the cylindrical portion of an adjacent sealing device, and a gap is provided between the spacer ring portion and the magnetized portion of the adjacent sealing device.

2. In claim 1, A sealing device characterized in that an end of the protruding portion and an end of the cylindrical portion are formed into a flat surface shape.

3. In claim 1 or claim 2, A sealing device characterized in that the end of the protrusion and the end of the cylindrical portion have a concave-convex engagement structure.

Images