JP2019044962A - Sealing device - Google Patents

Abstract

To provide a sealing device which can suppress mutual magnetic adsorption when laminated in a plurality of pieces, and can reduce an occupied volume.SOLUTION: A sealing device 9 seals an annular space between a fixed-side member 2 and a rotating-side member. A magnetic encoder comprises a support member 11 having an attachment plate part 112 extending to a radial direction, and attached to the rotating-side member, and an annular magnet 12 attached to the attachment plate part. The seal member comprises: a core material 21 having a cylinder part 211 attached to the fixed-side member, and a circular disc plate part 212 which is arranged so as to oppose the attachment plate part from the cylinder part; and an elastic material-made seal body 22 having a seal lip 22a fastened to the core material, and approximating or contacting with the support member. At least the circular disc plate part of the core material is composed of a non-magnetic material, and abuts on the annular magnet in the adjacent sealing device when a plurality of the sealing devices are laminated in an axial direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to, for example, a sealing device provided with a magnetic encoder attached to a rotating side member.

  As the sealing device as described above, a cored bar fitted to the inner peripheral surface of the outer ring, a slinger (including a member equivalent thereto) fitted to the outer peripheral surface of the inner ring, and the cored bar A sealing device comprising a seal lip resiliently contacting the slinger is widely used (see, for example, Patent Document 1). In the sealing device shown in Patent Document 1, a pulser ring (rotational magnetic encoder) is further provided on the slinger (rotational side annular member), and the rotation speed of the inner ring is detected. And such a sealing device is packaged and distribute | circulated in the state which the core metal, the seal | sticker lip, and the slinger were combined. Patent Document 1 pays attention to a problem when a plurality of stacked sealing devices are stacked and stored in a box at the time of delivery or transportation of such a sealing device. Specifically, when the sealing devices are stacked, the annular core metal (fixed side annular member) is generated by the magnetic force of the pulser ring because the pulser ring of one sealing device and the annular core metal of the other sealing device overlap. Is adsorbed. Therefore, when the sealing device is taken out of the box, there is a possibility that the annular core metal and the slinger may shift or come off due to the adsorption force acting on the annular core metal. Therefore, in Patent Document 1, a predetermined range from the inside to the outside of the outer surface of the annular core metal is covered with a sealing device adsorption preventing member made of a nonmagnetic material.

JP 2004-84795 A

  Incidentally, in Patent Document 1, the annular seal member mounted on the annular core metal is made of a nonmagnetic material such as a rubber material and extends from the opposing gap between the annular core metal and the slinger to the outer surface of the core metal. The example which comprises the said sealing device adsorption | suction prevention member by this extended part is disclosed. There is also a description that it is possible to cover a predetermined range of the cored bar with another rubber or resin sealing device adsorption preventing member instead of the extended portion of the sealing member. However, in the example disclosed in Patent Document 1, since the sealing device adsorption preventing member is interposed between the annular core metal and the pulser ring in a state where the sealing devices are stacked, the sealing device adsorption preventing member An extra volume is required for the number of stacking stages of thickness. Therefore, the number of sealing devices that can be stored in the packing box of a predetermined capacity is reduced, which may cause a reduction in the transfer efficiency.

  The present invention has been made in view of the above situation, and provides a sealing device with a magnetic encoder that can suppress the magnetic adsorption between adjacent sealing devices and reduce the occupied volume in the stacked state of a plurality of sealing devices. The purpose is to

  In the sealing device according to the present invention, the fixed side member is combined with a magnetic encoder attached to a rotating side member that rotates relative to the fixed side member, and a seal member attached to the fixed side member. A sealing device for sealing an annular space between the rotary member and the magnetic encoder, wherein the magnetic encoder includes a radially extending attachment plate portion and is attached to the rotary member, and the attachment plate. An annular magnet attached to the part, and the seal member includes a cylindrical part attached to the fixed side member and a disc part provided to face the attachment plate part from the cylindrical part A seal material made of an elastic material having a seal lip fixed to the core material and having a seal lip close to or in contact with the support member, and at least the disc portion of the core material is made of a nonmagnetic material; Multiple such sealing devices When stacked in the axial direction, characterized in that it is configured to contact with the annular magnet in adjacent the sealing device.

  According to the sealing device of the present invention, when a plurality of the sealing devices are stacked in the axial direction, the disc portion of the core material in the sealing member abuts on the annular magnet of the magnetic encoder in the adjacent sealing device. At this time, since the disc portion of the core material is made of a nonmagnetic material, even if the disc portion is in contact with the annular magnet, it is not magnetically attracted. Therefore, the plurality of sealing devices can be stored in a stacked state, and can be separated smoothly from other sealing devices when in use. In addition, since the core material of the sealing device can be stacked in a state where it is in contact with the annular magnet of another adjacent sealing device, the axial direction in the stacked state is higher than in the case where a member for adsorption prevention is interposed. Occupied volume can be reduced. As a result, the number of sealing devices that can be stored can be increased without increasing the volume of the storage box.

In the sealing device of the present invention, the nonmagnetic material may be a thermoplastic resin having heat resistance equal to or higher than the heat resistance of the annular magnet.
Since the nonmagnetic material which comprises a core material is used as thermoplastic resin according to this, weight reduction of a sealing device is achieved compared with the case where a core material is metal. In addition, since at least the disc portion of the core material has heat resistance equal to or higher than the heat resistance of the annular magnet, there is less concern that heat resistance as a sealing device may be reduced compared to the case where the core material is made of metal.
In this case, the thermoplastic resin may be polybutylene terephthalate.
According to this, since at least the disc portion of the core material is made of polybutylene terephthalate which is excellent in dimensional stability as compared with other resins, it is possible to suppress an increase in dimensional tolerance of the core material. Therefore, by suppressing the dimensional tolerance of the core material, it is possible to suppress an increase in the product-to-product variation in the proximity or contact state of the seal lip with the support member.

In the sealing device of the present invention, the entire core material may be made of the thermoplastic resin.
According to this, compared with the case where the whole core material is metal, the sealing device is further reduced in weight.

In the sealing device of the present invention, the cylindrical portion of the core material may be fitted to the stationary member via an adhesive.
According to this, since the cylindrical portion of the core material is fitted to the fixed side member via the adhesive, the core material is detached from the fixed side member even when the core material is made of nonmagnetic thermoplastic resin. Can be reliably suppressed.

In the sealing device of the present invention, at least the attachment plate portion of the support member in the magnetic encoder may be made of nonmagnetic material.
According to this, when a plurality of magnetic encoders are stacked and packaged separately from the magnetic encoder and the seal member, the annular magnet and the attachment plate portion in the adjacent magnetic encoders do not magnetically attract even if they abut. Therefore, each magnetic encoder can be smoothly separated and taken out from the other magnetic encoders.

  According to the present invention, it is possible to provide a sealing device capable of reducing the occupied volume while suppressing magnetic attraction between adjacent sealing devices in the stacked state of a plurality of sealing devices.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic longitudinal cross-sectional view which shows an example of the bearing apparatus with which the sealing device which concerns on this invention is applied. It is an enlarged view of the X section of FIG. 1, and is a figure which shows one Embodiment of the sealing device based on this invention. It is a partially broken longitudinal cross-sectional view which shows the state which stacked | piled up coaxially several of the sealing device of the embodiment. It is a figure similar to FIG. 3 which shows the modification of the sealing device of the embodiment. It is a figure similar to FIG. 3 which shows the further modification of the sealing device of the embodiment. It is a modification of the magnetic encoder which comprises the sealing device of the embodiment, and is a partially broken longitudinal cross-sectional view which shows the state which stacked | piled up several of the same magnetic encoder coaxial.

Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a bearing device 1 rotatably supporting a vehicle wheel (not shown). The bearing device 1 is a hub bearing, and generally, an outer ring (fixed side member) 2, a hub wheel 3, an inner ring member 4 integrally fitted on the vehicle body side of the hub ring 3, and the outer ring 2 And two rows of rolling elements (balls) 6... Interposed between the hub wheel 3 and the inner ring member 4. In this example, the hub wheel 3 and the inner ring member 4 constitute an inner ring (rotational side member) 5. The outer ring 2 is fixed to a vehicle body (not shown) of the automobile. Further, a drive shaft 7 is coaxially spline-fitted to the hub wheel 3, and the drive shaft 7 is connected to a drive source (drive transmission portion) (not shown) via a constant velocity joint 8. The drive shaft 7 is integrated with the hub wheel 3 by a nut 70, and the removal of the hub wheel 3 from the drive shaft 7 is prevented. The inner ring 5 (the hub ring 3 and the inner ring member 4) can be rotated (coaxially rotated) about the axis L with respect to the outer ring 2, and an annular space (hereinafter referred to as a bearing space) between the outer ring 2 and the inner ring 5. Say) S is formed. In the bearing space S, in a state in which the rolling elements 6 in two rows are held by the retainer 6a, the bearing ring 2a of the outer ring 2, the hub ring 3 and the bearing rings 3a and 4a of the inner ring member 4 can roll It is interspersed. The hub wheel 3 has a cylindrical hub wheel main body 30 and a hub flange 32 formed to extend radially outward from the hub wheel main body 30 via the rising base 31, and a bolt 33 is fixed to the hub flange 32. And a wheel is attached and fixed by a nut (not shown).
In the following, the side facing the wheel along the axis L direction (the side facing the left in FIG. 1) will be referred to as the wheel side, and the side facing the vehicle body (the side facing the right) will be referred to as the vehicle body side.

  Bearing seals 9, 90 are mounted between the outer ring 2 and the hub ring 3 and between the outer ring 2 and the inner ring member 4 at both ends along the axis L direction of the bearing space S, and bearing Both ends along the axis L direction of the space S are sealed. This prevents the entry of muddy water or the like into the bearing space S and the leakage of lubricant (such as grease) filled in the bearing space S to the outside.

  Of the bearing seals 9, 90, the sealing device according to the present invention is applied to the bearing seal 9 on the vehicle body side. The bearing seal 9 which is an embodiment of the sealing device according to the present invention will be described with reference to FIGS. 2 and 3 as well. The bearing seal (sealing device) 9 of the present embodiment is configured by combining the magnetic encoder 10 attached to the inner ring 5 axially rotating with respect to the outer ring 2 and the seal member 20 attached to the outer ring 2. Then, the magnetic encoder 10 and the seal member 20 are mounted between the outer ring 2 and the inner ring member 4 (inner ring 5) in a combined state, and the vehicle body side end of the bearing space S is sealed. The magnetic encoder 10 includes a slinger (supporting member) 11 provided with a radially extending attachment plate portion 112 and attached to the inner ring member 4, and an annular magnet 12 attached to a vehicle body side surface 112a of the attachment plate portion 112; Equipped with The slinger 11 is formed of a metal ring and extends outward from a cylindrical portion (hereinafter referred to as a slinger cylindrical portion) 111 fitted to the outer peripheral surface 4 b of the inner ring member 4 and a vehicle body side end portion 111 a of the slinger cylindrical portion 111. It consists of an annular attachment plate portion 112. The seal member 20 is attached to a cylindrical portion (hereinafter referred to as a core cylindrical portion) 211 fitted to the inner peripheral surface 2 b of the outer ring 2 from the wheel side end portion 211 a of the core cylindrical portion 211 and the attachment plate portion 112. And a core member 21 provided with a disc portion 212 provided to face the disc. A seal body 22 made of an elastic material (elastomer such as a rubber material) having seal lips 22a, 22b and 22c close to or in contact with the slinger 11 is integrally fixed to the core material 21. In the present embodiment, NBR is used as the material of the seal 22. Moreover, the whole core material 21 consists of a thermoplastic resin which is nonmagnetic material. Further, this thermoplastic resin has heat resistance equal to or higher than that of the annular magnet 12, and polybutylene terephthalate is preferably employed.

  The seal body 22 is fixed to the core member 21 so as to cover the vehicle body side surface 212 b and the inner peripheral surface 211 b of the core cylindrical member 211 from the inner peripheral edge 212 a of the disc portion 212 in the core member 21. Furthermore, the seal body 22 is fixed to the core material 21 so as to go around the vehicle body side end portion 211c of the core material cylindrical portion 211 and reach the outer peripheral surface 211d. The seal lips 22a and 22b are axial lips and extend from the seal body 22 so as to expand in diameter toward the vehicle body side, and the tip end portion contacts the wheel side surface 112b of the attachment plate portion 112 in the slinger 11 with elastic deformation. It is formed. Also, the seal lip 22c is a radial lip and extends so as to reduce in diameter while facing in the opposite direction to the seal lips 22a and 22b. Further, the seal lip 22 c is formed such that its tip end comes in contact with the outer peripheral surface 11 b of the slinger cylindrical portion 111 with elastic deformation. The seal lips 22a, 22b, 22c shown by the two-dot chain lines in FIGS. 2 and 3 show the original shape before elastic deformation.

  The annular magnet 12 is formed by insert molding of a rubber material in which magnetic powder is kneaded with a ringer 11 made of metal rings, and on the vehicle body side surface 12a, a large number of N poles and S poles are alternately magnetized along the circumferential direction. It is considered to be a magnetized surface. The outer diameter side portion 12 b of the annular magnet 12 is formed so as to go around the outer peripheral edge portion 112 c of the attachment plate portion 112 in the slinger 11. The inner diameter side portion 12 c of the annular magnet 12 is formed in a lip shape resiliently contacting the vehicle body side corner portion 4 c of the inner ring member 4. The vehicle body side surface (magnetization surface) 12 a of the annular magnet 12 is positioned to face the magnetic sensor 13 installed in the vehicle body. When the inner ring 5 is axially rotated, a magnetic change of the magnetized surface 12a is detected by the magnetic sensor 13, and a rotation detection mechanism such as a rotation speed of the wheel is configured.

  When the magnetic encoder 10 and the seal member 20 are combined, the bearing seal 9 configured as described above and the outer ring 2 of the vehicle body side end portion in the bearing space S of the bearing device 1 as shown in FIG. It is mounted between the inner ring member 4. More specifically, the bearing seal 9 is the outer ring by fitting the slinger cylindrical portion 111 to the outer peripheral surface 4 b of the inner ring member 4 and fitting the core cylindrical portion 211 to the inner peripheral surface 2 b of the outer ring 2. It is mounted between 2 and the inner ring member 4. When fitting the core cylindrical portion 211 to the vehicle body side inner circumferential surface 2 b of the outer ring 2, the outer circumferential surface 211 d of the core cylindrical portion 211 is coated with an adhesive (for example, an epoxy resin adhesive). Is desirable. As a result, even if there is a possibility that the rigidity of the core 21 is insufficient due to the core 21 being made of nonmagnetic thermoplastic resin, the core 21 is firmly fixed to the outer ring 2, and the core 21 is It is possible to reliably suppress the disengagement. Thus, when the inner ring 5 is coaxially rotated with respect to the outer ring 2 with the axial rotation of the drive shaft 7 in a state where the bearing seal 9 is mounted on the bearing device, the seal lips 22a, 22b, 22c are elastic with respect to the slinger 11. Relative sliding contact. By this, it is prevented that muddy water etc. infiltrate into bearing space S from the exterior. In addition, the lubricant filled in the bearing space S is prevented from leaking out. And, by the axial rotation of the slinger 11, the magnetic change of the annular magnet 12 is detected by the magnetic sensor, and the rotation speed etc. of the wheel (not shown) attached to the hub flange 32 is calculated.

In the present embodiment, since the core 21 is made of a thermoplastic resin, the weight of the bearing seal 9 can be reduced as compared with the case where the core 21 is made of metal. Further, since the core material 21 has heat resistance equal to or higher than the heat resistance of the annular magnet 12, there is less concern that the heat resistance as the bearing seal 9 will be reduced compared to the case where the core material 21 is made of metal. Furthermore, since the thermoplastic resin constituting the core material 21 is polybutylene terephthalate having excellent dimensional stability as compared with other resins (for example, PA polyamide (nylon) etc.), the dimensional tolerance of the core material 21 becomes large. Can be suppressed. Therefore, by suppressing the dimensional tolerance of the core material 21, it is suppressed that the dispersion | variation for every product of the proximity | contact thru | or a contact state with respect to the slinger 11 of the seal | sticker lip 22a, 22b, 22c becomes large.
In the present embodiment, the entire core material 21 is made of the thermoplastic resin, but at least the disc portion 212 may be made of the thermoplastic resin.

  The bearing seal 9 configured as described above has a plurality of bearings in a state in which the magnetic encoder 10 and the seal member 20 are combined as described above in the flow process until the bearing seal 1 is mounted. The seals 9 are coaxially stacked or aligned along the axial direction L and packaged in a packaging box. FIG. 3 shows a part of such a stacked state. When a plurality of the bearing seals 9 are stacked in the axial L direction, the disc portion 212 of the core 21 in the seal member 20 abuts on the annular magnet 12 of the magnetic encoder 10 in the adjacent bearing seal 9. At this time, since the core material 21 is made of a nonmagnetic material, even if the disc portion 212 is in contact with the annular magnet 12, it is not magnetically attracted. Therefore, the plurality of bearing seals 9 can be stored in a stacked state, and can be separated smoothly from the other bearing seals 9 when in use. In addition, since the plurality of bearing seals 9 can be stacked in a state where the core material 21 and the other annular magnet 12 adjacent to each other are in contact, stacking in the stacked state is possible as compared with the case of interposing a member for adsorption prevention. The occupied volume in the axial L direction can be reduced. As a result, the number of storable bearing seals 9 can be increased without increasing the volume of the storage box. In particular, in the case of providing a sealing device adsorption preventing member (for example, a rubber member) as disclosed in Patent Document 1, there is a concern that extra management points increase during manufacturing, but in the present embodiment, such concerns arise. Absent.

FIG. 4 is a modification of the bearing seal 9 of the embodiment, and the seal body 22 is changed so as to cover the entire outer peripheral surface 211 d of the core cylindrical portion 211. In this modification, the core 21 is formed such that the outer diameter of the core cylindrical portion 211 is smaller than the inner diameter of the outer ring 2. Further, in this modification, the seal body 22 wraps around the vehicle side end portion 211c of the core cylindrical portion 211 from the inner surface covering portion 221 fixed to the entire surface of the inner peripheral surface 211b of the core cylindrical portion 211 It does not stay in a part of 211 d, but includes an outer surface covering portion 222 fixed to the entire surface of the outer peripheral surface 211 d of the core cylindrical portion 211. The outer surface covering portion 222 is formed such that its thickness is smaller (thin) than the thickness of the core cylindrical portion 211, and its outer diameter is formed so as to be slightly larger than the inner diameter of the outer ring 2 . In this modification, when the bearing seal 9 is attached to the bearing device 1, the core cylindrical portion 211 of the core 21 is attached to the outer ring 2 via the outer surface covering portion 222. That is, since the outer surface covering portion 222 is fitted to the vehicle-body-side inner circumferential surface 2 b of the outer ring 2, compared with the case where the core cylindrical portion 211 is directly fitted to the vehicle-body-side inner circumferential surface 2 b of the outer ring 2, the core The stress acting on the material cylindrical portion 211 is relieved. Therefore, even if the core material 211 is made of resin, the possibility of breakage of the core material 21 can be reduced.
FIG. 4 shows a different example in that the inner diameter side portion 12c of the annular magnet 12 is not in the shape of a lip resiliently in contact with the vehicle body side surface corner 4c of the inner ring member 4 in the annular magnet 12 but is formed flat. However, it goes without saying that the configuration of the annular magnet 12 itself is the same as the example shown in FIG.
Further, since the other configuration is the same as that of the example shown in FIG.

FIG. 5 is a further modified example of the bearing seal 9 of the embodiment, in which the core material 21 is changed from resin to nonmagnetic metal material. In this modification, the core member 21 is made of nonmagnetic stainless steel, specifically, austenitic stainless steel (for example, SUS304 or the like). The disc portion 212 of the core 21 extends inward in the radial direction from the wheel side end portion 211 a of the core cylindrical portion 211 and is provided parallel to the attachment plate 112 of the support member 11. It is done. The disc portion 212 is formed such that at least a portion of the other bearing seal 9 in contact with the annular magnet 12 does not plastically deform when the bearing seal 9 is stacked on the other bearing seal 9. Here, even if the disc portion is made of austenitic stainless steel which is a nonmagnetic material, if the disc portion is subjected to plastic deformation such as bending, the disc portion is magnetic due to work-induced martensitic transformation. Although it transforms to the body, the disc portion 212 of this modification does not occur as such. Therefore, even if the disk portion 212 is in contact with the annular magnet 12 of the bearing seal 9 adjacent to each other, the magnetic attraction is avoided in advance. In this modification, the disc portion 212 is shaped to have no plastic deformation, but it is magnetized only to such an extent that it can not be magnetically attracted even when the disc portion 212 abuts on the annular magnet 12 of the adjacent bearing seal 9 If not, the disk portion 212 may be plastically deformed.
The other configuration is the same as the example shown in FIG. 3, so the same reference numerals are given to the common parts and the description thereof is omitted.

  FIG. 6 is a modification of the magnetic encoder 10 constituting the bearing seal 9 of the present embodiment, and shows a state in which a plurality of magnetic encoders 10 are stacked in the axial L direction. The bearing seal 9 is mounted on the bearing device 1 by combining the magnetic encoder 10 and the seal member 20 (not shown in the drawing), but the magnetic encoder 10 and the seal member 20 are individually stacked or aligned. It is also possible to pack. The present example is configured to be able to cope with such a case. The support member 11 includes a short cylindrical portion 111 fitted to the inner ring 5 (inner ring member 4), and an annular attachment plate portion 112 extending from the cylindrical portion 111 to the outer diameter side. The supporting member 11 is entirely made of a nonmagnetic material, and is preferably made of a thermoplastic resin, more preferably polybutylene terephthalate, as in the above example.

When the plurality of magnetic encoders 10 are stacked in the axis L direction, the attachment plate portion 112 of the support member 11 in the adjacent magnetic encoder 10 abuts on the annular magnet 12. However, since the entire support member 11 is made of a nonmagnetic material, the support member 11 is not magnetically attracted to the annular magnet 12 even if the attachment plate portion 112 is in contact with the annular magnet 12. Therefore, the plurality of magnetic encoders 10 can be stacked and stored in the packaging box, and can be separated and taken out smoothly from the other magnetic encoders 10 when in use. In addition, since the plurality of magnetic encoders 10 can be stacked in a state where the attachment plate portion 112 and the other annular magnets 12 adjacent to each other are in contact with each other, the stacked state is obtained as compared with the case of interposing a member for preventing adsorption. Occupied volume in the axial L direction can be reduced.
Thus, when the magnetic encoder 10 is individually packaged with the seal member 20 and distributed, the sealing device is not configured, and the demand of the user who wants to use only the rotation detection mechanism is appropriately addressed. be able to.

In addition, the material which comprises the core material 21 does not need to be a polybutylene terephthalate which is a thermoplastic resin. For example, as the core material 21, a thermoplastic resin such as ABS resin, polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polyphenylene ether, nylon / polyamide, polycarbonate, polyacetal, etc. may be used. Moreover, as the core material 21, not a thermoplastic resin but a thermosetting resin may be used, and for example, a phenol resin, an epoxy resin, etc. may be used. Moreover, although nonmagnetic stainless steel was illustrated as a modification of the material used for the core material 21 in FIG. 5, it may not be this but nonmagnetic metal materials, such as aluminum and copper, may be sufficient.
Furthermore, although it is desirable to apply an adhesive when fitting the core material 21 to the vehicle body side inner peripheral surface 2b of the outer ring 2, sufficient rigidity to the extent that the core material 21 does not come off the outer ring 2 can be secured. In the case of the above, the application of the adhesive may be omitted.

  Furthermore, in each embodiment, although the sealing device according to the present invention has been described as an example applied to a bearing device for a car, the present invention is not limited to this and is preferably applied to bearing devices in other industrial fields. Further, the bearing device for an automobile may be not only the bearing device shown in FIG. 1 but also another bearing device, and it may be a bearing device for driven wheels as well as for driving wheels. . Furthermore, the shapes of the core material, the support member, and the annular magnet are not limited to the illustrated ones and may be other shapes. In addition, although the seal lip has shown the example in elastic contact with the support member, it may simply be in contact or in proximity. Further, the number of seal lips, the form of the seal lip and the like can be appropriately changed according to the required specifications and the like. Further, for example, the thickness of the outer surface covering portion 222 shown in FIG. 4 is not limited to the example shown in the drawing, and may be formed to be larger (thicker) than the thickness of the core cylindrical portion 211.

2 Outer ring (fixed side member)
5 Inner ring (rotation side member)
9 Bearing seal (sealing device)
10 magnetic encoder 11 slinger (supporting member)
DESCRIPTION OF SYMBOLS 112 attachment plate part 12 annular magnet 20 sealing member 21 core material 211 cylindrical part 211a one end 22 sealing body 22a, 22b, 22c seal lip S bearing space (annular space)
L axis

Claims (6)

A combination of a magnetic encoder attached to a rotating side member relatively pivoting relative to the stationary side member and a seal member attached to the stationary side member creates a space between the stationary side member and the rotating side member. A sealing device for sealing an annular space, wherein
The magnetic encoder includes a support member attached to the rotating side member, the attachment member including a radially extending attachment plate, and an annular magnet attached to the attachment plate.
The sealing member is fixed to the core member and a core member including a cylindrical portion attached to the fixed side member and a disc portion provided to face the attachment plate portion from the cylindrical portion, and the support An elastic seal body having a seal lip close to or in contact with the member;
At least the disc portion of the core member is made of a nonmagnetic material, and when a plurality of the sealing devices are stacked in the axial direction, they are configured to contact the annular magnet in the adjacent sealing device. Sealing device characterized by In the sealing device according to claim 1,
The sealing device, wherein the nonmagnetic material is a thermoplastic resin having heat resistance equal to or higher than that of the annular magnet. In the sealing device according to claim 2,
The sealing device, wherein the thermoplastic resin is polybutylene terephthalate. In the sealing device according to claim 2 or claim 3,
A sealing device characterized in that the entire core material is made of the thermoplastic resin. The sealing device according to any one of claims 1 to 4.
A sealing device characterized in that the cylindrical portion of the core material is fitted to the fixed side member via an adhesive. The sealing device according to any one of claims 1 to 5.
At least an attachment plate portion of a support member in the magnetic encoder is made of a nonmagnetic material.

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