sealing device

Abstract

This invention provides a sealing device that can protect the encoder and reduce torque. [Solution] A sealing device 10 for sealing the space between an inner member 3 and an outer member 2 that rotates coaxially with respect to the inner member, comprising a slinger member 11 mounted on the outer member and having an encoder 12, and a cover member 13 mounted on the inner member, wherein the first cylindrical portion 11b of the slinger and the second cylindrical portion 13c of the cover are mounted facing each other and have a first labyrinth portion R1, which is a gap, along the axial direction, the first ring portion 11a of the slinger and the second ring portion 13d of the cover are mounted facing each other and have a second labyrinth portion R2, which is a gap, along the radial direction, the third cylindrical portion 13e of the cover is mounted facing the outer peripheral surface 2b of the outer member and has a third labyrinth portion R3, which is a gap, along the axial direction, and the encoder is covered by the cover member.

Description

Technical Field

[0001] The present invention relates to a sealing device applied to, for example, a rolling bearing that supports a wheel of an automobile. More specifically, the present invention relates to a sealing device that seals between an inner member and an outer member that rotates coaxially with the inner member.

Background Art

[0002] Conventionally, as a rolling bearing for an automobile as described above, a so-called outer ring rotating rolling bearing in which an outer ring is supported by an inner ring on the fixed side so as to be coaxially rotatable is used. As a sealing device applied to such a rolling bearing, the following Patent Document 1 and the following Patent Document 2 can be cited.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Patent Document 1 and Patent Document 2 disclose a sealing device provided with an encoder in the radial direction or the axial direction. All of these are configured such that the encoder can be disposed close to the sensor, but do not have a cover that actively protects the encoder from an attack by dust or the like from the outside. In addition, the larger the number of lip portions provided in such a sealing device, the more the sealing performance can be improved. However, since it cannot meet the requirement of reducing torque, a sealing device with low torque and high sealing performance is required.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a sealing device capable of protecting an encoder and reducing torque. [Means for solving the problem]

[0006] To achieve the above objective, configuration 1 of the present invention is a sealing device that seals the space between an inner member and an outer member that rotates coaxially with respect to the inner member, comprising: a slinger member mounted on the outer member and having an encoder; and a cover member mounted on the inner member, wherein the slinger member comprises: a slinger first ring portion mounted on the end face of the outer member; a slinger first cylindrical portion fitted to the inner circumferential surface of the outer member; a slinger second ring portion extending inward from the axial inner end of the slinger first cylindrical portion; and a slinger second cylindrical portion extending outward in the axial direction from the radial inner end of the slinger second ring portion, wherein the cover member comprises: a cover first cylindrical portion fitted to the outer circumferential surface of the inner member; a cover first ring portion extending outward from the axial outer end of the cover first cylindrical portion; and the cover first The slinger comprises a second cylindrical cover portion extending axially outward from the outer diameter end of the ring portion, a second ring portion of the cover extending axially outward from the outer diameter end of the second cylindrical cover portion toward the outer diameter side of the outer peripheral surface of the outer member, and a third cylindrical cover portion extending axially inward from the outer diameter end of the second ring portion of the cover, wherein the first cylindrical slinger portion and the second cylindrical cover portion are mounted facing each other with a first labyrinth portion, which is a gap, provided along the axial direction, the first ring portion of the slinger portion and the second ring portion of the cover are mounted facing each other with a second labyrinth portion, which is a gap, provided along the radial direction, the third cylindrical cover portion is mounted facing the outer peripheral surface of the outer member with a third labyrinth portion, which is a gap, provided along the axial direction, and the encoder is covered by the cover member.

[0007] The following description of embodiments reveals that the sealing device according to the present invention may have the following dependent configurations. <Configuration 2> In configuration 1, the encoder may be fixed to the outer surface of the first ring portion of the slinger. <Structure 3> In configuration 1 or configuration 2, the slinger member includes a third slinger cylindrical portion that fits onto the outer circumferential surface of the outer member, and the encoder may be fixed to the third slinger cylindrical portion. <Structure 4> In configuration 3, the encoder is made of an elastic material, the axial inner end of the third cylindrical portion of the slinger is covered by the encoder, and the elastic material may be elastically attached to the outer surface of the outer member. <Composition 5> In any one of configurations 1 to 4, the cover member may be provided with a lip portion that slides against the second ring portion of the slinger. [Effects of the Invention]

[0008] Since the sealing device of the present invention has the above-described configuration, it is possible to protect the encoder and reduce torque. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic cross-sectional view showing an example of a rolling bearing to which a sealing device according to one embodiment of the present invention is applied. [Figure 2] This is a diagram illustrating the sealing device in the same embodiment, and is an enlarged view of section X in Figure 1. [Figure 3] This diagram illustrates a modified example of the sealing device and is similar to Figure 2. [Figure 4] This diagram illustrates yet another variation of the sealing device and is similar to Figure 2. [Modes for carrying out the invention]

[0010] Hereinafter, an example of a sealing device according to this embodiment will be described with reference to the drawings. Note that in some figures, some of the detailed reference numerals used in other figures have been omitted. Furthermore, in the following description, the annular space S side within the rolling bearing 1 will be referred to as the inside, and the vehicle body side (see Figure 1) as the outside. In the figures, the lip portion shown by the dashed line represents the shape in its natural state before elastic deformation.

[0011] The sealing device 10 according to this embodiment seals the space between an inner member 3 and an outer member 2 that rotates coaxially with respect to the inner member 3. The sealing device 10 includes a slinger member 11 mounted on the outer member 2 and having an encoder 12, and a cover member 13 mounted on the inner member 3. The slinger member 11 includes a slinger first ring portion 11a mounted on the end face 2d of the outer member 2, a slinger first cylindrical portion 11b fitted to the inner circumferential surface 2c of the outer member 2, a slinger second ring portion 11c extending inward from the axial inner end 11ba of the slinger first cylindrical portion 11b, and a slinger second cylindrical portion 11d extending outward in the axial direction from the radial inner end 11ca of the slinger second ring portion 11c. The cover member 13 comprises a first cylindrical cover portion 13a that fits onto the outer peripheral surface 3b of the inner member 3, a first ring portion 13b extending outward from the axial outer end 13aa of the first cylindrical cover portion 13a, a second cylindrical cover portion 13c extending outward in the axial direction from the outer diameter end 13ba of the first ring portion 13b, a second ring portion 13d extending outward from the axial outer end 13ca of the second cylindrical cover portion 13c beyond the outer peripheral surface 2b of the outer member 2, and a third cylindrical cover portion 13e extending inward in the axial direction from the outer diameter end 13da of the second ring portion 13d. The first cylindrical slinger portion 11b and the second cylindrical cover portion 13c are mounted facing each other, with a first labyrinth portion R1 gap provided along the axial direction. The first ring portion 11a of the slinger and the second ring portion 13d of the cover are mounted facing each other, with a second labyrinth portion R2, which is a gap, provided along the radial direction. The third cylindrical portion 13e of the cover is mounted facing the outer peripheral surface 2b of the outer member 2, with a third labyrinth portion R3, which is a gap, provided along the axial direction. The encoder 12 is covered by the cover member 13. A detailed explanation follows below.

[0012] Figure 1 schematically shows an example of a vehicle bearing device 20 equipped with a rolling bearing 1 having an outer member 2 and an inner member 3. The bearing device 20 is applied to vehicles such as large trucks and buses. The bearing device 20 comprises an axle housing 23 through which a fully floating axle shaft 21 is inserted, a rolling bearing 1 which is a rolling bearing having a plurality of tapered rollers 4, 4, and a hub wheel 26 to which the wheel is connected. The hub wheel 26 is connected to the flange 22 of the axle 21 by bolts 27, and power from the differential gear is transmitted to the hub wheel 26 via the axle 21, causing the wheel to rotate. The rolling bearing 1, which rotatably supports the hub wheel 26, is fitted inside the hub wheel 26. The hub wheel 26 is formed such that most of the outer circumferential surface 2b of the outer member 2 of the rolling bearing 1 is fitted inside, while the vehicle body side end of the outer circumferential surface 2b of the outer member 2 is not fitted inside.

[0013] The rolling bearing 1 comprises an outer member 2, an inner member 3, multiple rows of tapered rollers 4, 4 arranged as rolling elements, and cages 5, 5 that hold the tapered rollers 4, 4. The inner member 3 is composed of two members aligned in the axial direction. The multiple rows of tapered rollers 4, 4 are interposed in the cages 5, 5 so as to be able to roll on the raceway surface 2a of the outer member 2 and the raceway surface 3a of the inner member 3 while being held by the cages 5, 5.

[0014] In the bearing device 20, differential oil flows towards the flange 22 side through the gap between the outer circumference of the axle 21 and the inner circumference of the axle tube 23 due to centrifugal force acting when the vehicle turns. For this reason, the sealing device 9 provided at the wheel-side end suppresses the intrusion of differential oil into the annular space S of the rolling bearing 1. In addition, the sealing device 10 provided at the vehicle body-side end functions to suppress the intrusion of muddy water and other substances from the outside. The sealing device 10 provided at the vehicle body-side end will be described in more detail below.

[0015] Figure 2 shows a schematic cross-sectional view of the sealing device 10 provided at the end of the vehicle body. As described above, the sealing device 10 comprises a slinger member 11 attached to the outer member 2 and having an encoder 12, and a cover member 13 attached to the inner member 3.

[0016] The slinger member 11 is an annular member formed substantially concentric with the outer member 2, and is formed by pressing a steel plate such as SPCC or SUS. The slinger member 11 includes a slinger first ring portion 11a, a slinger first cylindrical portion 11b, a slinger second ring portion 11c, and a slinger second cylindrical portion 11d.

[0017] The slinger first ring portion 11a is provided in contact with the end face 2d on the vehicle body side of the outer member 2. An encoder 12 is fixed to the outer surface (the surface on the vehicle body side) 11ab of the slinger first ring portion 11a. The encoder 12 covers the entire outer surface 11ab of the slinger first ring portion 11a and is fixed so as to wrap around the outer diameter end portion 11aa of the slinger first ring portion 11a. When mounted on the outer member 2, the end portion 12c of the encoder 12 is provided so as to be elastically in contact with the outer peripheral surface 2b. Thus, even if muddy water or the like flows along the outer peripheral surface 2b, the end portion 12c of the encoder 12 can prevent muddy water or the like from entering between the slinger first ring portion 11a and the end face 2d on the vehicle body side of the outer member 2. The encoder 12 is made of magnetic rubber, magnetic plastic, sintered magnet, or the like, and is an annular member in which N poles and S poles are alternately and continuously magnetized in the circumferential direction. The encoder 12 is provided so as to face the magnetic sensor 6 via the cover member 13, and can detect the rotational speed or the like of the outer member 2 which is a rotating side member.

[0018] The slinger first cylindrical portion 11b is formed so as to extend from the inner diameter end portion 11ac of the slinger first ring portion 11a toward the annular space S side (the wheel side). The slinger first cylindrical portion 11b is formed substantially parallel to the inner peripheral surface 2c of the outer member 2 and is fitted over the entire circumference of the inner peripheral surface 2c of the outer member 2.

[0019] The slinger second annular portion 11c is formed so as to extend from the inner end portion 11ba of the slinger first cylindrical portion 11b toward the inner diameter side. The slinger second annular portion 11c is arranged so as not to contact the cover first cylindrical portion 13a when mounted on the rolling bearing 1. The slinger second cylindrical portion 11d is formed so as to be substantially parallel to the cover first cylindrical portion 13a, and is formed so as to extend from the inner diameter end portion 11ca of the slinger second annular portion 11c toward the vehicle body side. This slinger second cylindrical portion 11d is arranged so that a labyrinth portion R4 is formed along the axial direction between the slinger second cylindrical portion 11d and the cover first cylindrical portion 13a when mounted on the rolling bearing 1.

[0020] The cover member 13 includes an annular member formed substantially concentrically with the inner member 3 and a seal member 14 made of an elastic material. The annular member covering the encoder 12 of the cover member 13 is made of a non-magnetic metal material, and may be made of, for example, non-magnetic stainless steel, specifically, austenitic stainless steel (e.g., SUS304, etc.). The annular member of the cover member 13 includes a cover first cylindrical portion 13a, a cover first annular portion 13b, a cover second cylindrical portion 13c, a cover second annular portion 13d, and a cover third cylindrical portion 13e.

[0021] The cover first cylindrical portion 13a is formed so as to fit around the entire outer peripheral surface 3b of the inner member 3. The cover first cylindrical portion 13a is formed such that its axial dimension is larger than that of the slinger second cylindrical portion 11d, and by facing the slinger second cylindrical portion 11d, a fourth labyrinth portion R4 is formed between the cover first cylindrical portion 13a and the slinger second cylindrical portion 11d. With such a configuration, no lip portion or the like is formed in the fourth labyrinth portion R4, and while achieving low torque, it is possible to suppress the grease filled in the annular space S from entering the sealing device 10. Note that it may be configured without the fourth labyrinth portion R4 and provided with a lip portion fixed to the slinger second cylindrical portion 11d and slidably contacting the cover first cylindrical portion 13a, or it may be provided with an inner diameter side lip portion 14c shown in FIG. 3 described later. At this time, the slidably contacting lip may be lightly contacted or may be non-contact.

[0022] The first ring portion 13b of the cover is formed extending outward from the axial outer end 13aa of the first cylindrical portion 13a of the cover, and when mounted on the rolling bearing 1, it is positioned closer to the vehicle body than the second cylindrical portion 11d of the slinger, and is positioned so as not to contact the axial outer end 11da of the second cylindrical portion 11d of the slinger. The first ring portion 13b of the cover is provided with a sealing member 14 made of an elastic material on its inner surface 13bb (the surface facing the annular space S). The sealing member 14 comprises a lip base 14a fixed to the inner surface 13bb of the first ring portion 13b of the cover and the inner diameter surface 13ce of the inner diameter side cylindrical piece 13cb, and a lip portion 14b that slides against the second ring portion 11c of the slinger. The lip portion 14b is the only lip provided in the sealing device 10 and elastically contacts the second ring portion 11c of the slinger with a sliding contact allowance. This fourth labyrinth section R4 and lip section 14b prevent muddy water and other substances from entering the annular space S from the outside, and also suppress the entry of grease and oil into the sealing device 10 from the annular space S.

[0023] The second cylindrical portion 13c of the cover comprises an inner diameter cylindrical piece 13cb and an outer diameter cylindrical piece 13cc. The inner diameter cylindrical piece 13cb is formed to extend from the outer diameter end 13ba of the first ring portion 13b of the cover toward the annular space S. The outer diameter cylindrical piece 13cc is provided on the outer diameter side of the inner diameter cylindrical piece 13cb and is formed to extend axially by bending back toward the vehicle body from the annular space S end 13cd of the inner diameter cylindrical piece 13cb toward the vehicle body. The end 13cd of the inner diameter cylindrical piece 13cb is provided so as not to contact the second ring portion 11c of the slinger when mounted on the rolling bearing 1. The outer diameter cylindrical piece 13cc is formed to extend toward the vehicle body beyond the encoder 12 when mounted on the rolling bearing 1. Furthermore, the outer diameter side cylindrical piece 13cc of the cover second cylindrical portion 13c is positioned such that a gap is formed between it and the slinger first cylindrical portion 11b when mounted on the rolling bearing 1, and this gap constitutes a first labyrinth portion R1 provided along the axial direction. In addition, the slinger second ring portion 11c and the end portion 13cd on the annular space S side of the inner diameter side cylindrical piece 13cb are positioned opposite each other such that a gap is formed in the axial direction, and this gap constitutes a fifth labyrinth portion R5.

[0024] The second ring portion 13d of the cover is formed extending from the axial outer end 13ca of the second cylindrical portion 13c of the cover outward from the outer circumferential surface 2b of the outer member 2, and the outer diameter end 13da of the second ring portion 13d of the cover is positioned outward from the outer circumferential surface 2b of the outer member 2. This allows the encoder 12, which is fixed to the outer surface (vehicle body side surface) 11ab of the first ring portion 11a of the slinger that is mounted on the end face 2d of the outer member 2, to be covered by the second ring portion 13d of the cover, thereby protecting the detected surface 12a of the encoder 12. A gap is formed between the second ring portion 13d of the cover and the detected surface 12a of the encoder 12 fixed to the first ring portion 11a of the slinger, and this gap constitutes a second labyrinth portion R2 along the radial direction. A magnetic sensor 6 for detecting the rotation of the encoder 12 is fixedly mounted on the vehicle body side of the second ring portion 13d of the cover. In the illustrated example, the magnetic sensor 6 is positioned to face the detection surface 12a of the encoder 12 in the axial direction via the second ring portion 13d of the cover.

[0025] The third cylindrical portion 13e of the cover is provided so as to extend from the second ring portion 13d of the cover toward the wheel, and is formed to be substantially parallel to the outer peripheral surface 2b of the outer member 2. When mounted on the rolling bearing 1, the third cylindrical portion 13e of the cover is positioned so as to create a gap between it and the outer peripheral surface 2b of the outer member 2, and this gap constitutes a third labyrinth portion R3 provided along the axial direction. This third labyrinth portion R3 is formed not only between the outer peripheral surface 2b of the outer member 2, but also between the R3 and the encoder 12 which is positioned to cover the outer diameter end 11aa of the first ring portion 11a of the slinger.

[0026] As described above, the sealing device 10 according to the above embodiment, when mounted on the rolling bearing 1, has a long labyrinth with a continuously meandering path consisting of a third labyrinth section R3, a second labyrinth section R2, and a first labyrinth section R1 from the outer diameter side. Therefore, compared to a sealing device with multiple sliding lips, it can effectively prevent the intrusion of mud, water, dust, etc. from the outside while maintaining low torque. Furthermore, since the encoder 12 provided on the slinger member 11 that fits onto the rotating outer member 2 can be covered by the cover member 13, damage to the encoder 12 due to attacks from dust, etc. from the outside can be prevented. In the above embodiment, the so-called axial encoder, which is fixed to the outer surface (vehicle body side surface) 11ab of the slinger first ring section 11a and provided in the axial direction, can be securely covered by the cover member 13. Furthermore, by including a fifth labyrinth section R5, a lip section 14b, and a fourth labyrinth section R4 in addition to the multiple labyrinth sections R1, R2, and R3, the sealing performance can be further improved.

[0027] Next, a modified example of the sealing device according to the above embodiment will be described with reference to Figures 3 and 4. Note that only the parts that differ from the above embodiment will be described, and the descriptions of common parts will be omitted or simplified. The sealing device 10A shown in Figure 3 differs in that the slinger member 11 has a third slinger cylindrical portion 11e, the encoder 12 is fixed to the third slinger cylindrical portion 11e, the sealing member 14 has multiple lip portions, the aforementioned fifth labyrinth portion R5 is absent, and the second cover cylindrical portion 13c does not have an inner diameter side cylindrical piece 13cb and an outer diameter side cylindrical piece 13cc.

[0028] The slinger member 11 includes a third slinger cylindrical portion 11e that fits onto the outer circumferential surface 2b of the outer member 2. The third slinger cylindrical portion 11e is formed to extend from the outer diameter end 11aa of the first slinger ring portion 11a toward the annular space S. The end (inner end) 11f of the third slinger cylindrical portion 11e toward the annular space S is slightly bent toward the outer diameter, and the end 11f is covered by the encoder 12. The encoder 12 covers the entire outer circumferential surface 11ea of ​​the third slinger cylindrical portion 11e and is positioned to wrap around the end 11f of the annular space S. When mounted on the outer member 2, the end 12c of the encoder 12 is provided to elastically contact the outer circumferential surface 2b. The encoder 12 is fixed to the outer circumferential surface 11ea of ​​the third slinger cylindrical portion 11e so as to face the magnetic sensor 6 via the cover third cylindrical portion 13e, and is a so-called radial encoder provided in the radial direction. As mentioned above, the material of the encoder 12 is not particularly limited, but if it is made of an elastic material such as magnetic rubber, the end 12c of the encoder 12 can be elastically attached to the outer peripheral surface 2b of the outer member 2. In this case, muddy water and the like can be prevented from entering between the outer peripheral surface 2b of the outer member 2 and the third cylindrical part 11e of the slinger, thus providing a rust prevention effect.

[0029] In this modified example, the third labyrinth portion R3 is formed by the gap between the third cylindrical portion 13e of the cover and the detected surface 12a of the encoder 12, and the second labyrinth portion R2 is formed by the gap between the second ring portion 13d of the cover and the outer surface 11ab of the first ring portion 11a of the slinger and the vehicle body-side end 12b of the encoder 12. The second cylindrical portion 13c of the cover is formed to extend axially outward from the outer diameter end 13ba of the first ring portion 13b of the cover, and a sealing member 14 is provided on the inner surface 13bb (the surface on the annular space S side) of the first ring portion 13b of the cover. The sealing member 14 includes a lip portion 14b that slides against the second ring portion 11c of the slinger, as well as an inner diameter side lip portion 14c that slides against the inner circumferential surface 11db of the second cylindrical portion 11d of the slinger. Here, the inner diameter lip portion 14c may have a smaller sliding contact degree than the lip portion 14b. With this configuration, even if it is difficult to ensure that the second cylindrical cover portion 13c constituting the first labyrinth portion R1 is longer than in the example in Figure 2, the presence of the third labyrinth portion R3 and the second labyrinth portion R2 ensures that the sealing performance of the sealing device 10A can be ensured.

[0030] The sealing device 10B shown in Figure 4 differs from the sealing device 10 according to the above embodiment shown in Figure 2 in the configuration of the third cylindrical slinger portion 11e and the encoder 12. Unlike the example shown in Figure 3, the third cylindrical slinger portion 11e is formed to be flat overall. The encoder 12 is formed in a substantially L-shape in cross-section and is fixed so as to cover the entire outer surface 11ab (vehicle body side surface) of the first ring portion 11a of the slinger and the entire outer peripheral surface 11ea of ​​the third cylindrical slinger portion 11e. With this configuration, since the encoder 12 is provided in both the radial and axial directions, the magnetic sensor 6 can be detected at any position, thereby increasing versatility.

[0031] In Figure 4, two magnetic sensors 6 are shown by dashed lines: one facing the encoder 12 in the axial direction and another facing the encoder 12 in the radial direction. However, it is sufficient to have either one of them.

[0032] The different configurations described in the above embodiments and modifications may be modified, rearranged, or combined as appropriate and necessary. Furthermore, the sealing devices 10, 10A, and 10B described above are not limited to the above configurations. For example, the sealing devices 10, 10A, and 10B may have a configuration without a lip portion 14b, and although the lip portions 14b and 14c are shown as being of a type that contacts the slinger member 11, the lip portions 14b and / or lip portions 14c may be of a non-contact type. [Explanation of symbols]

[0033] 2 Outer member 2b Outer surface 2c Inner surface 2d end face 3. Inner member 3b Outer surface 10,10A,10B Sealing device 11 Slinger component 11a Slinger first ring section 11ab Outer surface (side facing the vehicle body) 11b Slinger first cylindrical section 11c Slinger second ring 11ca inner diameter end 11d Slinger second cylindrical section 11e Slinger third cylindrical section 12 encoders 13 Cover component 13a Cover, first cylindrical section 13b Cover, first circular section 13ba outer diameter end 13c Cover second cylindrical part 13d Cover, second circular section 13da outer diameter end 13e Cover, third cylindrical section 14b Lip section R1 Labyrinth Section 1 R2 Second Labyrinth Section R3 Third Labyrinth Section

Claims

1. A sealing device that seals the space between an inner member and an outer member that rotates coaxially with respect to the inner member, The system comprises a slinger member mounted on the outer member and having an encoder, and a cover member mounted on the inner member, The slinger member comprises a first slinger ring portion attached to the end face of the outer member, a first slinger cylindrical portion fitted to the inner circumferential surface of the outer member, a second slinger ring portion extending inward from the axial inner end of the first slinger cylindrical portion, and a second slinger cylindrical portion extending outward in the axial direction from the radial inner end of the second slinger ring portion. The cover member comprises a first cylindrical cover portion that fits onto the outer circumferential surface of the inner member, a first ring portion of the cover extending outward from the axial outer end of the first cylindrical cover portion, a second cylindrical cover portion extending outward in the axial direction from the outer diameter end of the first ring portion of the cover, a second ring portion of the cover extending outward from the axial outer end of the second cylindrical cover portion beyond the outer circumferential surface of the outer member, and a third cylindrical cover portion extending inward in the axial direction from the outer diameter end of the second ring portion of the cover. The first cylindrical portion of the slinger and the second cylindrical portion of the cover are mounted facing each other, with a first labyrinth portion, which is a gap, provided along the axial direction. The first ring portion of the slinger and the second ring portion of the cover are mounted facing each other, with a second labyrinth portion, which is a gap, provided along the radial direction. The third cylindrical portion of the cover is mounted such that it faces the outer peripheral surface of the outer member and a third labyrinth portion, which is a gap, is provided along the axial direction. The sealing device is characterized in that the encoder is covered by the cover member.

2. In claim 1, The sealing device is characterized in that the encoder is fixed to the outer surface of the first ring portion of the slinger.

3. In claim 1 or claim 2, The slinger member comprises a third slinger cylindrical portion that is fitted to the outer peripheral surface of the outer member, The sealing device is characterized in that the encoder is fixed to the third cylindrical portion of the slinger.

4. In claim 3, The encoder is made of an elastic material, A sealing device characterized in that the axial inner end of the third cylindrical portion of the slinger is covered by the encoder, and the elastic material is elastically attached to the outer circumferential surface of the outer member.

5. In claim 1 or claim 2, The sealing device is characterized in that the cover member has a lip portion that slides against the second ring portion of the slinger.

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