Seal device

Abstract

To provide a seal device capable of suppressing damage to a magnetic encoder while suppressing the adsorption of adjacent seal devices to each other when the plurality of seal devices are stacked on each other.SOLUTION: In a seal device 10 for sealing an annular space S between a fixed side member and a rotation side member, a slinger member 20 includes a magnetized part 30 fixed to one radial side of one axial side face of a slinger circular-ring part 23 extending in the radial direction to constitute a magnetic encoder, and an abutment part 40 fixed to the other radial side of one axial side face of the slinger circular-ring part and having an irregular shape formed on one axial side face. In the state that the slinger member and a seal member 50 are combined, in comparison with a size w1 in the axial direction of one radial side site of the sealing device including an area where the magnetized part is provided, a size w2 in the axial direction of the other radial side site of the seal device including an area where the abutment part is provided is large.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sealing device that seals an annular space between a fixed member and a rotating member. [Background technology]

[0002] A sealing device that seals an annular space between a fixed member and a rotating member and that includes a magnetic encoder for detecting the rotational speed of the rotating member that rotates coaxially with the fixed member has been known. In some cases, multiple such sealing devices are stacked during storage or transportation, and in such cases, there is a concern that the magnetic encoder may come into contact with and adhere to adjacent sealing devices, making them difficult to separate. Patent Document 1 below discloses a seal that includes a seal member that is vulcanization bonded to a core that is fitted inside an outer member, and a magnetic encoder that is joined to the side of a slinger that is press-fitted onto the outer peripheral surface of the inner member. The seal member of this seal has a protrusion that comes into contact with the magnetic encoder of the lower seal when multiple seals are stacked, forming a gap between the core and the magnetic encoder of the lower seal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-180885 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the seal described in Patent Document 1, when multiple seals are stacked, there is a concern that the protrusions of one seal may come into contact with the magnetic encoder of the lower seal, causing unintended dents or the like at the contact point between the magnetic encoder and the seal.

[0005] The present invention has been made in consideration of the above-described situation, and aims to provide a sealing device that can suppress damage to magnetic encoders while suppressing adhesion between adjacent sealing devices when multiple sealing devices are stacked. [Means for solving the problem]

[0006] In order to achieve the above object, configuration 1 of the sealing device of the present invention is a sealing device that seals an annular space between the fixed side member and the rotating side member, comprising: a slinger member attached to a rotating side member that rotates coaxially with respect to a fixed side member; and a seal member that has a seal lip that elastically contacts the slinger member and is attached to the fixed side member, wherein the slinger member comprises a slinger ring portion extending radially, a magnetized portion that is fixed to one radial side of one axial side surface of the slinger ring portion and forms a magnetic encoder, and a contact portion that is fixed to the other radial side of one axial side surface of the slinger ring portion and has an uneven shape formed on one axial side surface, and is formed so that when the slinger member and the seal member are combined, the axial dimension of the other radial side portion of the sealing device, including the portion where the abutment portion is provided, is larger than the axial dimension of the one radial side portion of the sealing device, including the portion where the magnetized portion is provided.

[0007] The following description of the embodiments will disclose that the sealing device according to the present invention may include the following subsidiary configurations. <Configuration 2> In configuration 1, the other radial side portion may be provided with a protruding portion that protrudes further in the axial direction than the one radial side portion when the slinger member and the seal member are combined. <Configuration 3> In the second aspect, the protrusion may be provided on a seal ring portion extending radially from the other axial end of the cylindrical seal portion of the seal member that is fitted into the fixed-side member. <Configuration 4> In configuration 2, the protrusion may be an end portion on the other axial side of a slinger cylindrical portion that is fitted into the rotation-side member of the slinger member. <Configuration 5> In any one of configurations 2 to 4, the one radial side may be an outer diameter side, and the magnetized portion may be provided so as to protrude further toward the one axial side than the abutting portion. <Configuration 6> In any one of configurations 1 to 5, the magnetized portion and the contact portion may be made of the same material containing a magnetic material. <Configuration 7> In any one of configurations 1 to 6, the other radial side may be the rotating-side member side in the radial direction, and the contact portion may have an elastic contact portion that elastically contacts the rotating-side member. [Effects of the Invention]

[0008] Since the sealing device of the present invention has the above-described configuration, when a plurality of sealing devices are stacked, it is possible to suppress adhesion between adjacent sealing devices while also suppressing damage to the magnetic encoder. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic vertical cross-sectional view showing an example of a bearing device to which a sealing device according to each embodiment is attached. [Figure 2] 2 is an enlarged view of a portion X in FIG. 1, and is a schematic vertical cross-sectional view that schematically shows the sealing device according to the first 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] FIG. 6 is a schematic vertical cross-sectional view showing a sealing device according to a second embodiment. [Figure 5] FIG. 10 is a schematic vertical cross-sectional view showing a plurality of stacked sealing devices according to a third embodiment. [Figure 6] FIG. 10 is a schematic vertical cross-sectional view showing a plurality of stacked sealing devices according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an example of a sealing device according to each embodiment will be described with reference to the drawings. Note that in some drawings, some of the detailed reference numerals used in other drawings are omitted. In the drawings, the two-dot chain lines of the sealing member and the elastic contact portion indicate the shapes before elastic deformation. FIG. 1 is a diagram showing an example of a bearing assembly to which a sealing device is attached, and FIGS. 2 and 3 are diagrams showing an example of the sealing device according to the first embodiment.

[0011] 2 and 3, the sealing device 10 according to the first embodiment includes a slinger member 20 attached to a rotating-side member that rotates coaxially with respect to a fixed-side member, and a seal member 50 attached to the fixed-side member and having a seal lip 62 that elastically contacts the slinger member 20, thereby sealing an annular space S between the fixed-side member and the rotating-side member. With this configuration, foreign matter such as muddy water can be prevented from entering the annular space S from the outside. Furthermore, leakage of grease and the like filled in the annular space S to the outside can be prevented. The slinger member 20 comprises a slinger ring portion 23 extending in the radial direction, a magnetized portion 30 that constitutes a magnetic encoder and is fixed to one radial side of one axial side surface of the slinger ring portion 23, and a contact portion 40 that is fixed to the other radial side of one axial side surface of the slinger ring portion 23 and has an uneven shape formed on one axial side surface. With this configuration, the magnetized portion 30 that constitutes the magnetic encoder and the magnetic sensor G that is provided opposite the magnetized portion 30 can cooperate to detect the rotation speed of the rotating member.

[0012] The sealing device 10 is configured such that, when the slinger member 20 and the seal member 50 are combined, the axial dimension w2 of the other radial side portion of the sealing device 10, including the portion where the abutting portion 40 is provided, is larger than the axial dimension w1 of the one radial side portion of the sealing device 10, including the portion where the magnetized portion 30 is provided. With this configuration, when multiple sealing devices 10 are stacked in the axial direction, the abutting portion 40 contacts the other radial side portion of an adjacent sealing device 10, while a gap is provided between the magnetized portion 30 and the adjacent sealing device 10. This prevents the magnetized portion 30 from contacting the adjacent sealing devices 10, thereby preventing adjacent sealing devices 10 from attracting each other and preventing damage such as dents and scratches from occurring in the magnetized portion 30 that constitutes the magnetic encoder. Furthermore, when a set of sealing devices 10 is lifted, the lower sealing device 10 is prevented from attracting to the lower sealing device 10, preventing the slinger member 20 and the seal member 50 from separating. Furthermore, since the abutment portion 40 has an uneven shape, when multiple sealing devices 10 are stacked, the contact area between the abutment portion 40 and an adjacent sealing device 10 can be reduced, and sticking can be suppressed even if the abutment portion 40 or the part that comes into contact with the abutment portion 40 is made of an elastic material.

[0013] In a state in which the slinger member 20 and the seal member 50 are combined, a protruding portion 13 is provided at the other radial side portion of the sealing device 10, protruding further toward the other axial direction than the one radial side portion. With this configuration, when a plurality of sealing devices 10 are stacked along the axial direction, the protruding portion 13 comes into contact with the abutting portion 40 of an adjacent sealing device 10, while it is possible to prevent the sealing device 10 from coming into contact with the magnetized portion 30 of the adjacent sealing device 10. Furthermore, compared to a configuration in which the protruding portion 13 is not provided, it is possible to ensure a gap between the magnetized portion 30 and the adjacent sealing device 10 while reducing the axial dimension of the abutting portion 40. An example of a specific configuration will be described below.

[0014] FIG. 1 shows an example of a bearing device 1 that rotatably supports a wheel (not shown) of a vehicle such as an automobile. The bearing device 1 generally includes an outer ring 2, which corresponds to the fixed member described above, an inner ring 5, which corresponds to the rotating 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 to 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 to prevent it from falling off the hub ring 3. The inner ring 5 (hub ring 3 and inner ring member 4) is rotatable around an 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 space S. Within the annular space S, two rows of rolling elements 6 are held by a retainer 6a, and the raceway 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 and nuts (not shown).

[0015] A sealing device 10 is attached between the outer ring 2 and the inner ring member 4 at one end of the annular space S in the axial direction (on the vehicle body side). Another sealing device 70 is attached between the outer ring 2 and the hub wheel 3 at the other end of the annular space S in the axial direction (on the wheel side). The sealing device 10 and the other sealing device 70 seal both ends of the annular space S, preventing foreign matter such as muddy water from entering the annular space S and preventing lubricant (such as grease) filled in the annular space S from leaking to the outside. The other sealing device 70 may be configured to seal the gap between the outer ring 2 and the hub wheel 3, and may, for example, be equipped with a seal lip that elastically contacts the hub flange 3d or the hub wheel body 3b.

[0016] Next, details of each component of the sealing device 10 according to the first embodiment, which is mounted at one axial end of the annular space S, will be described. In the first embodiment, the one radial side will be described as the outer diameter side (the fixed member, outer ring 2 side), and the other radial side will be described as the inner diameter side (the rotating member, inner ring member 4 (inner ring 5) side). That is, the magnetized portion 30 is fixed to one axial side surface of the slinger ring portion 23 so as to cover the outer diameter side, and the abutting portion 40 is fixed to cover the inner diameter side. With this configuration, the area of ​​one axial side surface of the magnetized portion 30 can be made larger than in a configuration in which the magnetized portion 30 is provided on the inner diameter side, thereby increasing the number of magnetic poles of a magnetic encoder (described later) and improving resolution. Furthermore, the outer diameter side portion 11 of the sealing device 10, including the magnetized portion 30, is the one radial side portion of the sealing device 10, and the inner diameter side portion 12 of the sealing device 10, including the abutting portion 40, is the other radial side portion of the sealing device 10. That is, in this embodiment, the sealing device 10 is formed so that the axial dimension w2 of the inner diameter side portion 12 is larger than the axial dimension w1 of the outer diameter side portion 11.

[0017] The slinger member 20 has a slinger ring portion 23 and is provided with a slinger core body 21 that fits into the inner ring member 4. The slinger core body 21 is provided with a slinger cylindrical portion 22 that extends from the inner diameter side end of the slinger ring portion 23 to the other axial direction and fits onto the inner ring member 4. The slinger core body 21 is formed into a substantially L-shape in a radial cross section. The slinger core body 21 may be formed by pressing a steel plate such as SPCC or SUS.

[0018] The magnetized portion 30 is provided in an annular shape around the entire circumferential direction of the slinger ring portion 23. The magnetized portion 30 is magnetized with alternating north and south poles continuously along the circumferential direction. Such a magnetized portion 30 is provided facing a magnetic sensor G provided on a vehicle body or the like to constitute a magnetic encoder that detects the rotational speed of the wheel, etc. The radial dimension of the magnetized portion 30 is preferably at least half the radial dimension of the slinger ring portion 23 in order to ensure a large area for one axial side surface of the magnetized portion 30 (the detection surface of the magnetic encoder). The one axial side surface of the magnetized portion 30 is formed into a flat surface parallel to the radial direction. The magnetized portion 30 wraps around the outer diameter side end of the slinger ring portion 23 and reaches the other axial side surface. This configuration prevents the magnetized portion 30 from peeling off from the slinger ring portion 23. The magnetized portion 30 may be made of an elastic material such as rubber, or may be made of a hard synthetic resin, etc., as long as it contains a magnetic material such as magnetic powder.

[0019] The magnetized portion 30 is provided so as to protrude further toward one side in the axial direction than the abutting portion 40. With this configuration, when a plurality of sealing devices 10 are stacked, the protruding portion 13 can easily be caught on the inner diameter side end of the magnetized portion 30, and radial displacement of the stacked sealing devices 10 can be suppressed. Furthermore, when the sealing device 10 is mounted on the bearing device 1, it is easier to bring the magnetic sensor G close to the magnetized portion 30 compared to a configuration in which the abutting portion 40 is located further toward one side in the axial direction than the magnetized portion 30.

[0020] The abutment portion 40 is annularly provided around the entire circumferential direction of the slinger ring portion 23. Although the abutment portion 40 is provided to face the magnetic sensor G, it is configured not to constitute a magnetic encoder. When multiple sealing devices 10 are stacked in the axial direction, the abutment portion 40 comes into contact with the protrusion 13 of an adjacent sealing device 10. Therefore, the abutment portion 40 is provided at a position that overlaps with the protrusion 13 in the axial direction when the slinger member 20 and the seal member 50 are combined. From the viewpoint of ensuring a large radial dimension of the magnetized portion 30, the radial dimension of the abutment portion 40 is preferably less than half the radial dimension of the slinger ring portion 23, although this depends on the position and size of the protrusion 13 described below. In other words, the radial dimension of the abutment portion 40 is preferably smaller than the radial dimension of the magnetized portion 30. Furthermore, the entire one axial side surface of the magnetized portion 30 is positioned on one axial side of the one axial side surface of the abutting portion 40. In other words, the abutting portion 40 is positioned on the other axial side of the one axial side surface of the magnetized portion 30. Although it depends on the axial dimension w1 of the outer diameter side portion 11 and the axial dimension w2 of the inner diameter side portion 12, from the viewpoint of providing a step where the protruding portion 13 of an adjacent sealing device 10 can be hooked onto the inner diameter side end of the magnetized portion 30 when multiple sealing devices 10 are stacked, the axial dimension (thickness dimension) t2 of the abutting portion 40 from one axial side surface of the slinger ring portion 23 may be approximately 2 / 5 to 4 / 5 of the axial dimension (thickness dimension) t1 of the magnetized portion 30 from one axial side surface of the slinger ring portion 23. The abutting portion 40 may be made of an elastic material such as rubber, or may be made of a hard resin. The contact portion 40 may be provided in a non-contact state with the magnetized portion 30 so that a small radial gap is provided between the contact portion 40 and the magnetized portion 30 .

[0021] An uneven portion 41 formed in an uneven shape is provided on one axial side surface of the abutting portion 40. Here, the one axial side surface of the abutting portion 40 is an imaginary plane that contacts the tips of most of the convex portions in the uneven portion 41. In other words, the protruding tips, which are the axial side ends of the multiple convex portions that are provided so as to be positioned on approximately the same plane in the uneven portion 41, form the one axial side surface of the abutting portion 40. The uneven portion 41 is not particularly limited as long as the one axial side surface of the abutting portion 40 has an uneven shape. For example, the uneven portion 41 may be formed by matte finishing (surface roughening) or the like on the one axial side surface of the abutting portion 40. The uneven portion 41 may be provided over substantially the entire one axial side surface of the abutting portion 40. The uneven portion 41 may be formed by a plurality of protrusions protruding on one axial side of the abutting portion 40, or a plurality of annular ridges extending along the circumferential direction of the abutting portion 40. In short, compared to a configuration in which an uneven shape is not formed on one axial side surface of the abutting portion 40, it is sufficient if, when a plurality of sealing devices 10 are stacked in the axial direction, sticking between one axial side surface of the abutting portion 40 of one sealing device 10 and the protruding direction tip of the protruding portion 13 of an adjacent sealing device 10 can be suppressed.

[0022] The abutment portion 40 has an elastic contact portion 42 that elastically contacts the rotation-side member (inner ring member 4 in this embodiment). With this configuration, it is possible to prevent foreign matter such as muddy water from entering the fitting portion between the rotation-side member and the slinger member 20. Furthermore, compared to a configuration in which the magnetized portion 30 is provided on the rotation-side member and an elastic contact portion is provided on the magnetized portion 30, it is possible to prevent distortion or deformation of the magnetized portion 30 due to elastic contact of the elastic contact portion. Furthermore, if the abutment portion 40 is configured not to contain a magnetic material, it tends to be lower in hardness than a contact portion that contains a magnetic material, making the elastic contact portion 42 more susceptible to elastic deformation, and allowing the elastic contact portion 42 to be designed with a large interference. The elastic contact portion 42 is formed integrally with the abutting portion 40. This elastic contact portion 42 is provided at the inner diameter side end of the abutting portion 40. The elastic contact portion 42 protrudes toward the inner diameter side beyond the inner circumferential surface of the slinger cylindrical portion 22 and is formed in a triangular shape tapering toward the inner diameter side in a radial cross section. The elastic contact portion 42 may be configured to elastically contact the inner ring member 4 when the sealing device 10 is attached to the bearing apparatus 1, and may be trapezoidal in a radial cross section, or may have an inner circumferential surface that is arc-shaped in a radial cross section.

[0023] The seal member 50 includes a seal core 51 to which a seal base 60 made of an elastic material such as rubber and having a seal lip 62 is fixed, and which fits into the outer ring 2. The seal core 51 has a cylindrical seal portion 52 extending in the axial direction and fitted into the outer ring 2. The cylindrical seal portion 52 is provided with a recess 57 recessed toward the inner diameter at one axial end of its outer peripheral surface. The seal core 51 also has a seal ring portion 53 extending toward the inner diameter from the other axial end of the cylindrical seal portion 52. The seal ring portion 53 is formed substantially parallel to the radial direction except for an inclined portion 55 located midway along the radial direction of the seal ring portion 53. The inclined portion 55 of the seal ring portion 53 is formed to be inclined toward one axial side as it approaches the inner diameter side. As described above, the outer diameter portion 54, which is the portion of the seal ring portion 53 outer diameter side of the inclined portion 55, and the inner diameter portion 56, which is the portion of the seal ring portion 53 inner diameter side of the inclined portion 55, are each formed to extend substantially parallel to the radial direction. The seal core 51 is formed in a substantially L-shape in a radial cross section, and may be formed by pressing a steel plate such as SPCC or SUS.

[0024] The seal base 60 is provided so as to generally cover one axial side of the seal core body 51. The seal base 60 is fixed to the seal core body 51 so as to cover the inner circumferential surface of the cylindrical seal portion 52 and one axial side surface of the annular seal portion 53. The seal base 60 is formed so as to wrap around one axial end of the cylindrical seal portion 52 and reach a recess 57 provided on the outer circumferential surface. This configuration can prevent the seal base 60 from peeling off from the seal core body 51. An annular ridge 61 is provided on the outer circumferential surface of the seal base 60 at a position where it reaches the recess 57. The annular ridge 61 protrudes outward beyond the outer circumferential surface of the cylindrical seal portion 52 and comes into elastic contact with the inner circumferential surface of the outer ring 2. This can prevent foreign matter such as muddy water from entering the fitting portion between the outer ring 2 and the cylindrical seal portion 52. The seal base 60 is fixed so as to wrap around the inner diameter side end of the seal ring portion 53 (inner diameter portion 56) and cover a part of the inner diameter side of the other axial side surface of the seal ring portion 53. With this configuration, peeling of the seal base 60 from the seal core 51 can be more effectively suppressed.

[0025] A plurality of seal lips 62 are formed and protrude from the seal base 60. The plurality of seal lips 62 include an axial lip 63 that protrudes to one axial side and elastically contacts the other axial side surface of the slinger ring portion 23, and a radial lip 64 that protrudes to the inner diameter side and elastically contacts the outer peripheral surface of the slinger cylindrical portion 22. The axial lip 63 is formed so as to be inclined toward the outer diameter as it protrudes from the seal base 60 to one axial side. The radial lip 64 is formed so as to be inclined toward the other axial side as it protrudes from the seal base 60 to the inner diameter side.

[0026] The protrusion 13 is provided on the seal member 50. With this configuration, compared to a configuration in which the protrusion 13 is provided on the slinger member 20, when a plurality of sealing devices 10 are stacked, even if the slinger member 20 and the seal member 50 are displaced relatively in the axial direction due to the reaction force or bending of the seal lip 62, the distance from one axial side surface of the magnetized portion 30 to the other axial side surface of the slinger ring portion 23 of an adjacent sealing device 10 is less likely to change. More specifically, the protrusion 13 is provided on the seal ring portion 53. With this configuration, when a plurality of sealing devices 10 are stacked, the protrusion 13 provided on the seal ring portion 53 comes into contact with the abutment portion 40 of an adjacent sealing device 10, while contact between a sealing device 10 and the magnetized portion 30 of an adjacent sealing device 10 can be suppressed. Furthermore, compared to a configuration in which the protrusion 13 is at the end of the slinger cylindrical portion 22, the degree of freedom in designing the radial position at which the protrusion 13 is provided is improved, and the protrusion 13 can be provided corresponding to the position at which the abutment portion 40 of the slinger ring portion 23 is provided.

[0027] The protrusion 13 is a seal protrusion 65 that protrudes toward the other axial direction from a portion of the seal base 60 that covers the other axial side surface of the inner diameter portion 56 of the seal ring portion 53. In other words, the protrusion 13 is made of an elastic material. With this configuration, compared to a configuration in which the protrusion 13 is made of metal, dents, scratches, etc. are less likely to occur in the abutment portion 40 when multiple sealing devices 10 are stacked. The tip of this seal protrusion 65 in the protruding direction (the other axial side) is located furthest toward the other axial side in the inner diameter side portion 12. The seal protrusion 65 may be formed in a continuous ring shape along the circumferential direction, or may be formed intermittently along the circumferential direction. The seal protrusion 65 is formed in a substantially triangular shape tapering in the protruding direction in a radial cross section, but is not limited to this shape and may have other shapes. Note that the surface of the seal protrusion 65, including at least the tip in the protruding direction, may be formed with an uneven shape by matte finishing or the like, similar to the uneven portion 41 of the abutting portion 40. With this configuration, when multiple sealing devices 10 are stacked, it is possible to more effectively prevent the seal protrusion 65 from sticking to the abutting portion 40 of the adjacent sealing device 10.

[0028] 2 and 3 , when the sealing device 10 configured as described above is mounted on the bearing device 1 and when the slinger member 20 and seal member 50 are combined, the surface of the slinger member 20 that is located closest to one axial side and facing that side may be arranged to be substantially flush with the surface of the seal member 50 that is located closest to one axial side and facing that side. Furthermore, the surface of the slinger member 20 that is located closest to one axial side and facing that side and the surface of the seal member 50 that is located closest to one axial side and facing that side may be arranged to be substantially flush with one axial side surface of the outer ring 2 when mounted on the bearing device 1. In this embodiment, the surface of the slinger member 20 that is located closest to one axial side and facing that side is one axial side surface of the magnetized portion 30. In addition, in this embodiment, the surface of the seal member 50 that is located closest to one axial side and faces one axial side is one axial side of the seal base 60 that covers one axial side of the seal cylindrical portion 52.

[0029] The outer diameter portion 11 of the sealing device 10 is a portion that axially overlaps with the magnetized portion 30. The axial dimension w1 of this outer diameter portion 11 is the dimension from one axial side surface of the magnetized portion 30 to the other axial side surface of the portion that is located furthest on the other axial side in the portion that axially overlaps with the magnetized portion 30 when the slinger member 20 and the seal member 50 are combined. In this embodiment, the portion that is located furthest on the other axial side in the portion that axially overlaps with the magnetized portion 30 is the outer diameter portion 54 of the seal ring portion 53. The inner diameter side portion 12 of the sealing device 10 is a portion that axially overlaps with the abutting portion 40. The axial dimension w2 of this inner diameter side portion 12 is the dimension from one axial side surface of the abutting portion 40 to the other axial side surface of the portion that is located furthest to the other axial side in the portion that axially overlaps with the abutting portion 40 when the slinger member 20 and the seal member 50 are combined. In this embodiment, the portion that is located furthest to the other axial side in the portion that axially overlaps with the abutting portion 40 is the seal protrusion 65. The axial dimension from the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 to the protruding direction tip of the seal protruding portion 65 is larger than the axial dimension from one axial side surface of the abutting portion 40 to one axial side surface of the magnetized portion 30. The dimension obtained by subtracting the axial dimension from one axial side surface of the abutting portion 40 to one axial side surface of the magnetized portion 30 from the axial dimension from the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 to the protruding direction tip of the seal protruding portion 65 is approximately the same as the dimension from one axial side surface of the magnetized portion 30 to the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 of an adjacent sealing device 10 when multiple sealing devices 10 are stacked.

[0030] When multiple sealing devices 10 are stacked, if the slinger member 20 and the seal member 50 are displaced relatively in the axial direction due to the reaction force or deflection of the seal lip 62, the axial dimension w1 of the outer diameter side portion 11 and the axial dimension w2 of the inner diameter side portion 12 will also fluctuate relatively. If the axial dimension w1 of the outer diameter side portion 11 increases, the axial dimension w2 of the inner diameter side portion 12 will also increase, and if the axial dimension w1 of the outer diameter side portion 11 decreases, the axial dimension w2 of the inner diameter side portion 12 will also decrease. The axial dimension w1 of the outer diameter side portion 11 and the axial dimension w2 of the inner diameter side portion 12 may be set appropriately taking into consideration the size of the gap between the magnetized portion 30 and the adjacent sealing device 10 when multiple sealing devices 10 are stacked, the prevention of separation due to adhesion between adjacent sealing devices 10, and the above-mentioned displacement due to the reaction force or deflection of the seal lip 62, etc.

[0031] Next, a sealing device according to another embodiment will be described with reference to FIGS. In the following embodiments, differences from the previously described examples will be mainly described, and explanations of similar configurations will be omitted or briefly explained. In each embodiment, explanations of the same effects as in the previously described examples will also be omitted or briefly explained. Furthermore, the sealing device according to each of the following embodiments is mounted to one axial end of the annular space in the bearing device, similar to the first embodiment (see FIG. 1).

[0032] 4 is a schematic diagram of a sealing device 10A according to a second embodiment. This sealing device 10A differs from the previous example in the configuration of a slinger member 20A. In the slinger member 20A of the sealing device 10A, the magnetized portion 30A and the abutting portion 40A are integrally formed with each other with no radial gap between them. Furthermore, the abutting portion 40A does not have the elastic contact portion 42, and the inner peripheral surface of the abutting portion 40A is formed substantially flush with the inner peripheral surface of the slinger cylindrical portion 22.

[0033] The magnetized portion 30A and the abutting portion 40A are formed from the same material containing a magnetic material. This configuration eliminates the need for two-color molding and simplifies the molding process for the magnetized portion 30A and the abutting portion 40A. In this embodiment, the magnetized portion 30A and the abutting portion 40A are formed from an elastic material, such as rubber, containing a magnetic material, such as magnetic powder. However, they may also be made from a hard synthetic resin containing a magnetic material. In the slinger member 20A, the portion that becomes the magnetized portion 30A is magnetized with alternating north and south poles in the circumferential direction. The abutting portion 40A, which contains a magnetic material, is positioned so that one axial side surface is located on the other axial side surface of the magnetized portion 30A. This minimizes the influence of magnetization, thereby preventing the abutting portion 40A from adhering to the adjacent sealing device 10A when multiple sealing devices 10A are stacked. In this embodiment, the magnetized portion 30A and the abutment portion 40A are integrally formed, but they may also be separate bodies made of the same material, and in such a case, a radial gap may be provided between the magnetized portion 30A and the abutment portion 40A.

[0034] 5 is a schematic diagram of a sealing device 10B according to a third embodiment. This sealing device 10B differs from the previous examples in the configurations of the protrusion 13A, the slinger member 20B, and the seal member 50A. The seal member 50A does not have a seal protrusion 65. The protrusion 13A is the other axial end 22a of the cylindrical slinger portion 22. With this configuration, when multiple sealing devices 10B are stacked, the other axial end 22a (protrusion 13A) of the cylindrical slinger portion 22 comes into contact with the abutment portion 40B of the adjacent sealing device 10B, and a gap is provided between the protrusion 13A and the magnetized portion 30B of that sealing device 10B. Furthermore, compared to the configuration in which the protrusion 13A is made of an elastic material as described above, the relative axial displacement of the slinger member 20B and the seal member 50A due to compression of the protrusion 13A can be suppressed. The radial dimension of the abutment portion 40B may be such that the tip of the other axial end 22a of the cylindrical slinger portion 22, which is the protrusion 13A of the adjacent sealing device 10B, comes into contact with the abutment portion 40B when multiple sealing devices 10B are stacked.

[0035] As in the above examples, the outer diameter side portion 11A is a portion that overlaps with the magnetized portion 30B in the axial direction. As in the above examples, the inner diameter side portion 12A is a portion that overlaps with the abutting portion 40B in the axial direction. Meanwhile, the axial dimension w2 of the inner diameter side portion 12A is the dimension from one axial side surface of the abutting portion 40B to the tip of the other axial end portion 22a of the slinger cylindrical portion 22. In other words, in this embodiment, the inner diameter side portion 12A is composed only of the slinger member 20B. The axial dimension from the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 to the tip of the other axial end portion 22a of the slinger cylindrical portion 22 is larger than the axial dimension from one axial side surface of the abutting portion 40B to one axial side surface of the magnetized portion 30B. The dimension obtained by subtracting the axial dimension from one axial side surface of the abutting portion 40B to one axial side surface of the magnetized portion 30B from the axial dimension from the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 to the tip of the other axial end portion 22a of the slinger cylindrical portion 22 is approximately the same as the dimension from one axial surface of the magnetized portion 30B to the other axial side surface of the outer diameter portion 54 of the seal ring portion 53 of an adjacent sealing device 10B when multiple sealing devices 10B are stacked.

[0036] Unlike the above examples, because the inner diameter side portion 12A is configured only with the slinger member 20B, the axial dimension w2 of the inner diameter side portion 12A does not fluctuate due to the relative axial displacement of the slinger member 20B and the seal member 50A. Even if the axial dimension w1 of the outer diameter side portion 11A fluctuates due to the relative axial displacement of the slinger member 20B and the seal member 50A caused by the reaction force or deflection of the seal lip 62, the axial dimension w1 of the outer diameter side portion 11A and the axial dimension w2 of the inner diameter side portion 12A can be appropriately set so that the axial dimension w1 of the outer diameter side portion 11A is smaller than the axial dimension w2 of the inner diameter side portion 12A that does not fluctuate.

[0037] FIG. 6 schematically illustrates a sealing device 10C according to a fourth embodiment. This sealing device 10C differs from the previous examples in the configurations of the protrusion 13B, slinger member 20C, and seal member 50B. Also, unlike the previous examples, this sealing device 10C has a magnetized portion 30C on the inner diameter side of the slinger ring portion 23 and an abutment portion 40C on the outer diameter side of the slinger ring portion 23. That is, in this embodiment, one radial side is the inner diameter side, and the other radial side is the outer diameter side. The portion on the one radial side is the inner diameter side portion 12B, and the portion on the other radial side is the outer diameter side portion 11B. Therefore, the axial dimension w3 of the outer diameter side portion 11B of the sealing device 10C is larger than the axial dimension w4 of the inner diameter side portion 12B.

[0038] The protrusion 13B is provided on the seal member 50B, as in the first embodiment. The protrusion 13B is the outer diameter portion 54 of the seal ring portion 53, instead of the seal protrusion 65. The other axial side surface of the outer diameter portion 54 of the seal ring portion 53 is located furthest to the other axial side in the outer diameter side region 11B. The inclined portion 55 of the seal ring portion 53 of the seal core 51A is bent so that the inner diameter portion 56 is positioned to one side in the axial direction compared to the previous example. The inclined portion 55 of the seal ring portion 53 is bent from a position overlapping with the abutment portion 40C in the axial direction in order to prevent the seal ring portion 53 from contacting the magnetized portion 30C of an adjacent sealing device 10C when multiple sealing devices 10C are stacked. Unlike the above-mentioned examples, the radial lip 64A of the seal member 50B is inclined to one side in the axial direction as it protrudes from the seal base 60 to the inner diameter side.

[0039] The slinger core 21A of this embodiment is formed in a double cylindrical shape having a slinger cylindrical portion 22 and an outer diameter side cylindrical portion 24 that extends axially to one side from the outer diameter side end of the slinger ring portion 23. The axial dimension of the outer diameter side cylindrical portion 24 is smaller than that of the slinger cylindrical portion 22, and faces the seal base 60, which covers the outer diameter portion 54 of the seal ring portion 53, with a gap therebetween.

[0040] The magnetized portion 30C is fixed so as to cover the inner diameter side of one axial side surface of the slinger ring portion 23. The inner peripheral surface of the magnetized portion 30C is formed flush with the inner peripheral surface of the slinger cylindrical portion 22. The abutting portion 40C is fixed so as to cover the outer diameter side of one axial side surface of the slinger ring portion 23 and the outer peripheral surface and other axial end of the outer diameter side cylindrical portion 24. The abutting portion 40C is provided so as to protrude in the axial direction further than the magnetized portion 30C. That is, the one axial side surface of the abutting portion 40C is provided so as to be located on one axial side of the one axial side surface of the magnetized portion 30C. Furthermore, as in the above examples, when the slinger member 20C is mounted in the bearing device 1 and when the slinger member 20C and the seal member 50B are combined, the one axial side surface of the abutting portion 40C of the slinger member 20C may be provided so as to be located on approximately the same plane as the one axial side surface of the seal member 50B located on the most axial side. Furthermore, the one axial side surface of the abutting portion 40C and the one axial side surface of the seal member 50B located on the most axial side may be provided so as to be located on approximately the same plane as the one axial side surface of the outer ring 2 when mounted in the bearing device 1.

[0041] The abutting portion 40C and the seal base 60 covering the seal ring portion 53 may face each other in the radial direction with a gap therebetween, and a labyrinth seal R1 may be formed by this gap. With this configuration, the labyrinth seal R1 can prevent the intrusion of muddy water and the like from the outside. Note that the abutting portion 40C may not cover the outer peripheral surface and the other axial end of the outer diameter side cylindrical portion 24. In this case, the outer peripheral surface of the outer diameter side cylindrical portion 24 and the seal base 60 covering the seal ring portion 53 may face each other in the radial direction with a gap therebetween, and a labyrinth seal R1 may be formed by this gap.

[0042] In this embodiment, the outer diameter side portion 11B of the sealing device 10C is a portion that overlaps with the abutting portion 40C in the axial direction. The axial dimension w3 of this outer diameter side portion 11B is the dimension from one axial side surface of the abutting portion 40C to the other axial side surface of the outer diameter portion 54 of the seal ring portion 53. The inner diameter side portion 12B of the sealing device 10C is a portion that overlaps with the magnetized portion 30C in the axial direction. The axial dimension w4 of this inner diameter side portion 12B is the dimension from one axial side surface of the magnetized portion 30C to the tip of the other axial end portion 22a of the slinger cylindrical portion 22. As described above, the one axial side surface of the abutting portion 40C is located on the one axial side of the magnetized portion 30C. The outer diameter portion 54 of the seal ring portion 53 is located so as to protrude furthest toward the other axial side of the sealing device 10C. That is, the one axial side portion and the other axial side portion of the outer diameter side portion 11B are located so as to protrude axially further than the inner diameter side portion 12B. As a result, when multiple sealing devices 10C are stacked, the magnetized portions 30C do not come into contact with adjacent sealing devices 10C, regardless of the axial dimension from the one axial side surface of the magnetized portion 30C to the abutting portion 40C and the axial dimension from the tip of the other axial end portion 22a of the slinger cylindrical portion 22 to the other axial side surface of the outer diameter portion 54 of the seal ring portion 53.

[0043] Because the inner diameter side portion 12B is configured only by the slinger member 20C, the axial dimension w4 of the inner diameter side portion 12B does not fluctuate due to relative axial displacement of the slinger member 20C and the seal member 50B. Even if the axial dimension w3 of the outer diameter side portion 11B fluctuates due to relative axial displacement of the slinger member 20C and the seal member 50B caused by the reaction force or deflection of the seal lip 62, the axial dimension w3 of the outer diameter side portion 11B and the axial dimension w4 of the inner diameter side portion 12B can be appropriately set so that the axial dimension w3 of the outer diameter side portion 11B is larger than the axial dimension w4 of the inner diameter side portion 12B that does not fluctuate.

[0044] The different configurations described in the above embodiments may be modified, rearranged, or combined as needed. For example, in the first to third embodiments, the one axial side surface of the abutting portion is located on the other axial side of the one axial side surface of the magnetized portion. However, as in the fourth embodiment, the one axial side surface of the abutting portion may be located on the one axial side of the one axial side surface of the magnetized portion. Furthermore, the one axial side surfaces of the magnetized portion and the abutting portion may be located at the same axial position. Furthermore, the seal protrusion may be located on the outer diameter portion or the inclined portion of the seal ring portion, as long as it overlaps with the abutting portion in the axial direction. Furthermore, the seal protrusion is not limited to the seal protrusion or the seal ring portion, and a portion of the seal core extending from the inner diameter end of the seal ring portion to the other axial side may be provided as the protrusion. Furthermore, instead of the inclined portion of the seal ring portion, a bent portion extending from the inner diameter end of the outer diameter portion to the one axial side may be provided. Furthermore, the seal ring portion may be formed so that the entire seal ring portion extends substantially parallel to the radial direction. Furthermore, the seal lip may be one or more. [Explanation of symbols]

[0045] 2 Outer ring (fixed side component) 3 Hub ring (rotating part) 4 Inner ring member (rotating member) 5 Inner ring (rotating member) 10,10A~10C sealing device 11,11A Outer diameter side part (radially one side part) 11B Outer diameter side part (radially other side part) 12, 12A Inner diameter side portion (other radial side portion) 12B Inner diameter side part (radially one side part) 13,13A,13B Protrusion 20, 20A~20C Slinger parts 22 Slinger cylindrical part 22a Other axial end 23 Slinger ring part 30,30A~30C Magnetized part 40,40A~40C Contact part 42 Ballistic contact part 50, 50A, 50B sealing material 52 Cylindrical seal part 53 Seal ring part 62 Seal lip w1 Axial dimension (of one radial side) w2 (diametrical other side) axial dimension w3 Axial dimension (of the other radial side) w4 Axial dimension (on one radial side)

Claims

1. A sealing device that seals an annular space between the fixed-side member and the rotating-side member, the sealing device comprising: a slinger member attached to a rotating-side member that rotates coaxially with a fixed-side member; and a seal member that has a seal lip that elastically contacts the slinger member and is attached to the fixed-side member, The slinger member includes a slinger ring portion extending in the radial direction, a magnetized portion fixed to one radial side of one axial side surface of the slinger ring portion and constituting a magnetic encoder, and a contact portion fixed to the other radial side of one axial side surface of the slinger ring portion and having an uneven shape formed on one axial side surface, a sealing device characterized in that, when the slinger member and the seal member are combined, the axial dimension of the other radial side portion of the sealing device, including the portion where the abutment portion is provided, is larger than the axial dimension of the one radial side portion of the sealing device, including the portion where the magnetized portion is provided.

2. In claim 1, A sealing device characterized in that the other radial side portion is provided with a protrusion that protrudes further in the axial direction than the one radial side portion when the slinger member and the seal member are combined.

3. In claim 2, The sealing device is characterized in that the protrusion is provided on a seal ring portion extending radially from the other axial end of a cylindrical seal portion that is fitted to the fixed side member of the seal member.

4. In claim 2, A sealing device characterized in that the protrusion is the other axial end of a slinger cylindrical portion that is fitted into the rotating side member of the slinger member.

5. In any one of claims 2 to 4, The one radial side is an outer diameter side, The sealing device is characterized in that the magnetized portion is provided so as to protrude to one side in the axial direction beyond the abutting portion.

6. In any one of claims 1 to 4, A sealing device, characterized in that the magnetized portion and the abutting portion are formed from the same type of material containing a magnetic material.

7. In any one of claims 1 to 4, the other radial side is the rotating member side in the radial direction, The sealing device is characterized in that the abutment portion has an elastic contact portion that elastically contacts the rotating member.

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