JP2010048290A - Sealing device with magnetic encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device with a magnetic encoder capable of preventing the surface of a magnetic encoder or a sensor from being damaged due to contamination of a foreign substance and thereby capable of retaining a sufficient seal performance. <P>SOLUTION: The sealing device includes the magnetic encoder 2, a protective cover 3 and a seal member 4, and is interposed between an outer member 21 and an inner member 22 which rotate relatively to each other, thereby sealing the two members. The magnetic encoder 2 includes a core metal 5 mounted on a circumference of the rotational member of the two members, which faces the irrotational member, and a multipolar magnet 6 fixed on the axially-directed face of the core metal. The protective cover 3 is fitted and mounted on the circumference of the irrotational member, which faces the rotational member, and faces the multipolar magnet 6 of the magnetic encoder 2. The seal member 4 is mounted on the irrotational member to seal the clearance between the core metal 5 of the magnetic encoder 2 and the seal member 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing device that seals between an annular space between inner and outer rings of a bearing and an external environment, and relates to a sealing device with a magnetic encoder having a magnetic encoder serving as a detection target of a rotation detection device.

As this type of sealing device with a magnetic encoder, for example, as shown in FIG. 34, a magnetic encoder 62 in which a multipolar magnet 66 is attached to a standing plate portion 65b of an L-shaped cored bar 65, and an elastic with a cored bar. There is what consists of the seal 64. The magnetic encoder 62 is attached to an inner ring serving as a rotation side member of the wheel bearing. The elastic seal 64 is attached to an outer ring that is a stationary member of the wheel bearing. The elastic seal 64 has a plurality of lip portions, and some of the lip portions are in sliding contact with the core metal 65 of the magnetic encoder 62. A sensor 69 that constitutes a rotation detection device together with the magnetic encoder 62 is attached to a fixed-side member (for example, a bearing outer ring) so as to face the multipolar magnet 66 of the magnetic encoder 62 in the axial direction.
Further, in the sealing device with the encoder having the above-described configuration, as shown by a two-dot chain line, a configuration in which the outer side of the multipolar magnet 66 in the magnetic encoder 62 is covered with a nonmagnetic protective cover 68 has been proposed. (For example, patent document 1).
JP 2003-240007 A

  However, in the sealing device with a magnetic encoder shown in FIG. 34, the magnetic encoder 62 that is a rotating part is configured to rotate relative to the sensor 69 that is a fixed part through a minute gap, so that foreign matter such as pebbles is generated when the vehicle travels. When the gap between the sensor 69 and the magnetic encoder 62 is entered, the surfaces of the magnetic encoder 62 and the sensor 69 are damaged. If the damage is large, the pitch accuracy of the magnetic encoder 62 is deteriorated, and there is a problem that a correct detection output cannot be obtained.

  In the sealing device with a magnetic encoder disclosed in Patent Document 1, the surface of the magnetic encoder 62 is protected by the protective cover 68, but the sensor 69 that is a fixed part is not protected. The magnetic encoder 62 and the sensor 69 are not protected. Relative rotation through a minute gap. Therefore, there is a possibility that the surface of the sensor 69 is damaged due to foreign matters mixed in the gap between the magnetic encoder 62 and the sensor 69, and the correct sensor output cannot be obtained.

  An object of the present invention is to provide a sealing device with a magnetic encoder that can prevent the surface of a magnetic encoder or a magnetic sensor from being damaged due to contamination of foreign matter and can ensure sufficient sealing performance.

The sealing device with a magnetic encoder according to the present invention is provided between an inner member and an outer member positioned on the outer periphery of the inner member and rotating relative to the inner member. A sealing device with a magnetic encoder that seals between the side members includes a magnetic encoder having the following configuration, a protective cover, and a seal member.
The magnetic encoder includes an annular cored bar fitted and attached to a peripheral surface of the inner side member and the outer side facing the non-rotating side member of the rotating side member, and the axial direction of the cored bar And an annular multipolar magnet having a plurality of magnetic poles that are fixed to the surface facing the surface and arranged in the circumferential direction. The protective cover is fitted and attached to a peripheral surface of the non-rotating side member facing the rotating side member, and a gap is formed on a detected surface that is a surface facing the axial direction of the multipolar magnet of the magnetic encoder. It is considered as an annular shape facing each other. The seal member includes a core metal utilization seal portion that is attached to the non-rotating side member and seals a gap between the core metal of the magnetic encoder and the seal member.
According to this configuration, the annular protective cover fitted and attached to the peripheral surface of the non-rotating side member (for example, the outer member) facing the rotating side member (for example, the inner member) A to-be-detected surface of a multipolar magnet of an annular magnetic encoder that is fitted and attached to a peripheral surface facing the member is opposed to the surface through a gap. For this reason, the to-be-detected surface of the multipolar magnet of a magnetic encoder is covered with a protective cover, and it can prevent that a foreign material mixes between the multipolar magnet of a magnetic encoder and a sensor. Since the sensor arranged facing this does not rotate relative to the protective cover, the foreign matter is not dragged on the sensor surface. Therefore, it is possible to prevent the surface of the magnetic encoder or the sensor from being damaged due to foreign matter mixing.
In addition, since the gap between the core metal of the magnetic encoder and the seal member is sealed by the seal using the core metal of the seal member attached to the outer member, sufficient sealing performance can be ensured.

  In the present invention, the inner member may be a rotation side member. In a general wheel bearing, the inner member is a rotation side member.

In the present invention, a protective cover / core metal seal portion made of an elastic body that seals between the protective cover and the core of the magnetic encoder may be provided on the periphery of the rotating side member of the protective cover.
Thus, when the gap between the protective cover and the core metal of the magnetic encoder is sealed with the protective cover / core metal seal made of an elastic body provided on the periphery of the protective cover, the multi-pole magnet of the magnetic encoder and the protective cover are sealed. It is possible to reliably prevent foreign matter from entering the gap between the two.

In the present invention, a protective cover / rotary side member sealing portion made of an elastic body may be provided that seals between the protective cover and the peripheral surface of the rotary side member with which the core of the magnetic encoder is fitted.
Thus, when the gap between the protective cover and the rotating member (for example, the inner member) is sealed with the protective cover / rotating member seal portion made of an elastic body provided on the periphery of the protective cover, Foreign matter can be reliably prevented from entering the gap between the encoder's multipolar magnet and the protective cover.

In this invention, the rotation side member is an inward member, and the core of the magnetic encoder has a cylindrical portion that fits into the inner member, and a standing plate portion that extends from the cylindrical portion and faces in the axial direction. The multi-pole magnet is fixed to the standing plate portion, and a protective cover made of an elastic body that seals between the protective cover and the core of the magnetic encoder on the inner diameter side of the multi-pole magnet. A seal part between the cored bars may be provided on the protective cover, and an outer diameter of the cylindrical part of the cored bar of the magnetic encoder may be smaller than an inner diameter of the seal part between the protective cover and the cored bar.
As described above, when the outer diameter of the cylindrical portion of the core bar of the magnetic encoder is made smaller than the inner diameter of the protective cover / core metal seal portion, in the operation of assembling the sealing device with the magnetic encoder to the bearing, A sufficient allowance for the jig for press-fitting the magnetic encoder into a certain inward member can be secured, and the press-fitting process can be easily performed.

In this invention, you may make the periphery of the said rotation side member side of the said protective cover open only the clearance gap which comprises a non-contact seal with respect to the surrounding surface of the said rotation side member.
In this way, when a non-contact seal is configured between the peripheral edge of the protective cover and the peripheral surface of the rotating side member, it is possible to prevent foreign matter from entering the gap between the multipolar magnet of the magnetic encoder and the protective cover. And the contact resistance can be reduced.

In this invention, the peripheral edge of the protective cover on the rotating side member side may be brought close to the core bar of the magnetic encoder by a gap that forms a non-contact seal.
Thus, when a non-contact seal is formed between the peripheral edge of the protective cover and the core bar of the magnetic encoder, it is possible to prevent foreign matters from entering the gap between the multipolar magnet of the magnetic encoder and the protective cover. Can do.

In this invention, you may provide the metal contact prevention member which consists of an elastic body which prevents that a protective cover contacts a metal at the said rotation side member at the time of the excessive load effect | action at the periphery of the said rotation side member side of the said protection cover.
As described above, when the metal contact prevention member made of an elastic body is provided on the periphery of the protective cover, even when an excessive load that narrows the space between the non-rotation side member and the rotation side member is applied, the metal contact prevention member is Since only the elastic contact with the peripheral surface of the rotation-side member is required, it is possible to prevent the protective cover from coming into metal contact with the peripheral surface of the rotation-side member.

In the present invention, a metal contact preventing member made of an elastic body that prevents the protective cover from coming into metal contact with the core of the magnetic encoder when an excessive load is applied may be provided on the periphery of the protective cover on the rotating side member side. good.
As described above, when the metal contact prevention member made of an elastic body is provided on the periphery of the protective cover, even if an excessive load is applied such that the space between the magnetic encoder and the protection cover is reduced, the metal contact prevention member is not attached to the magnetic ender. Since only the elastic contact with the metal core is required, it is possible to prevent the protective cover from making metal contact with the metal core of the magnetic encoder.

In this invention, you may make the dimension of the clearance gap between the said protective cover and the said rotation side member smaller than the dimension of the clearance gap between the multipolar magnet of the said magnetic encoder, and a protective cover.
As described above, when the size of the gap between the protective cover and the rotation side member is smaller than the size of the gap between the multipolar magnet of the magnetic encoder and the protection cover, the gap between the protection cover and the rotation side member is reduced. Since a non-contact seal is formed, it is possible to prevent foreign matters from entering the gap between the multipolar magnet of the magnetic encoder and the protective cover. Even if foreign matter is mixed in, the size of the foreign matter is smaller than the size of the gap between the multipolar magnet of the magnetic encoder and the protective cover, so that the surface of the magnetic encoder is not damaged.

In this invention, you may make the dimension of the clearance gap between the said protective cover and the said metal core of the said magnetic encoder smaller than the dimension of the clearance gap between the multipolar magnet of the said magnetic encoder, and a protective cover.
When the dimensions are set in this way, a non-contact seal is configured between the protective cover and the core of the magnetic encoder, so that foreign matter can be prevented from entering the gap between the magnetic pole of the magnetic encoder and the protective cover. Can be prevented.

In this invention, the said inner member is a rotation side member, The core part of the said magnetic encoder is a cylindrical part fitted to the surrounding surface of the said inner member, and the standing board part which extends from this cylindrical part and faces to an axial direction And the outer diameter of the cylindrical portion may be smaller than the inner diameter of the metal contact preventing member of the protective cover.
As described above, when the outer diameter of the cylindrical portion of the core of the magnetic encoder is made smaller than the inner diameter of the metal contact prevention member provided on the periphery of the protective cover, the rotation of the sealing device with the magnetic encoder on the bearing is rotated. A sufficient allowance for the jig for press-fitting the magnetic encoder into the inner member, which is the side member, can be secured, and the press-fitting process can be easily performed.

In this invention, you may provide the radial lip which slidably contacts to the surrounding surface to which the said magnetic encoder of the said rotation side member was attached to the said sealing member.
Thus, when the radial lip provided on the seal member is brought into sliding contact with the peripheral surface of the rotary member, the cross-sectional height of the sealing device with a magnetic encoder can be reduced.

In this invention, the core bar of the magnetic encoder includes a cylindrical portion that fits on the peripheral surface of the rotating side member, and a vertical plate portion that extends from the cylindrical portion and faces in the axial direction. You may protrude to the fixed surface side of a multipolar magnet with respect to a board part.
As described above, when the cylindrical portion of the core of the magnetic encoder is projected to the fixed surface side of the multipole magnet with respect to the standing plate portion, the radial lip of the seal member is not hindered by the cylindrical portion of the core. Can be brought into sliding contact with the peripheral surface of the rotation side member.

In the present invention, a protective cover / core metal seal portion made of an elastic body in contact with the core metal of the magnetic encoder may be provided on the periphery of the protective cover on the rotating side member side.
Thus, when the gap between the protective cover and the core metal of the magnetic encoder is sealed with the protective cover / core metal seal made of an elastic body provided on the periphery of the protective cover, the multi-pole magnet of the magnetic encoder and the protective cover are sealed. It is possible to reliably prevent foreign matters from entering the gap between the two.

In this invention, the protective cover / core metal non-contact made of an elastic body that is adjacent to the peripheral edge of the protective cover on the rotation side member side with respect to the core metal of the magnetic encoder with a gap forming a non-contact seal. A contact seal portion may be provided.
In this way, when a non-contact seal is formed between the protective cover-core non-contact seal portion formed of an elastic body provided on the periphery of the protective cover and the core bar of the magnetic encoder, the multi-pole magnet of the magnetic encoder It is possible to prevent foreign matters from entering the gap between the protective cover.

  In this invention, you may abbreviate | omit the core utilization seal | sticker part of the said sealing member. In the case of this configuration, the contact resistance with respect to the rotation side member can be reduced by an amount corresponding to the omission of the core metal utilization seal portion.

  In this invention, the core bar of the magnetic encoder has a cylindrical portion that fits to the peripheral surface of the non-rotating side member, and a vertical plate portion that extends from the cylindrical portion and faces in the axial direction. A core that is fitted to the non-rotating side member directly or via a portion of the protective cover that is fitted to the non-rotating side member. The elastic member is composed of gold and an elastic member fixed to the core metal, and the elastic member is used as the core metal utilization seal portion, and one or a plurality of side lips that are in contact with the vertical plate portion of the core metal of the magnetic encoder. And a radial lip whose tip is in contact with or close to the metal core of the magnetic encoder or the rotating side member.

  In the present invention, two radial lips may be provided.

In the present invention, the inner radial lip of the two radial lips may be a non-contact type.
Thus, even if the inner radial lip is a non-contact type, the grease leakage preventing function can be maintained, and the contact resistance of the seal member to the non-rotating side member can be reduced accordingly.

  In this invention, the core bar of the magnetic encoder has a cylindrical portion that fits to the peripheral surface of the non-rotating side member, and a vertical plate portion that extends from the cylindrical portion and faces in the axial direction. A core that is fitted to the non-rotating side member directly or via a portion of the protective cover that is fitted to the non-rotating side member. The elastic member is composed of gold and an elastic member fixed to the core metal. The elastic member has two radial lips whose tips are in contact with or close to the cylindrical portion of the core metal or the rotation side member. Of the radial lips of the sheet, the inner radial lip may be a non-contact type, and the outer radial lip may be a contact type.

  In this invention, it is good also as what has two side lips.

In this invention, the protection which consists of an elastic body which contacts the said non-rotating side member fixed to the said protective cover, and prevents that water permeates into the fitting part between the said protective cover and the said non-rotating side member. A seal part between the cover and the non-rotating side member may be provided.
In this way, when the fitting part between the protective cover and the non-rotating side member is sealed with the sealing part between the protective cover and the non-rotating side member made of an elastic body provided on the protective cover, the fitting part It is possible to reliably prevent water from entering the bearing.

In this invention, the said protective cover has a cylindrical part fitted to the said surrounding surface of the said non-rotating side member, and the standing board part extended from this cylindrical part and facing an axial direction, The said sealing member is the said protection The cover is composed of a cored bar having a cylindrical part fitted to the cylindrical part of the non-rotating side member of the cover and an elastic member fixed to the cored bar, and the tip of the cylindrical part of the cored bar of the seal member is protected. You may make it contact the said standing board part of a cover.
In this way, when the tip of the cylindrical portion of the core of the seal member is brought into contact with the vertical plate of the protective cover, the distance between the vertical plate of the core of the seal member and the vertical plate of the protective cover is a constant dimension. Therefore, the work of press-fitting the cylindrical portion of the core of the seal member into the cylindrical portion of the protective cover can be easily performed.

  In this invention, the peripheral surface side end surface facing the rotation side member of the seal member and the inner diameter side end surface of the protective cover may be in close contact. Further, the inner diameter portion of the protective cover may be made larger than the inner diameter portion of the magnetic encoder.

  The sealing device with a magnetic encoder according to the present invention is provided between an inner member and an outer member positioned on the outer periphery of the inner member and rotating relative to the inner member. A sealing device with a magnetic encoder that seals between a side member, a magnetic encoder, a protective cover, and a seal member, wherein the magnetic encoder is a non-rotating member in the rotation side member of the inner member and the outer member. An annular core having a plurality of magnetic poles arranged in the circumferential direction and fixed to a surface facing the axial direction of the cored bar and fitted to a circumferential surface facing the rotation side member. The detected protective cover is a surface facing the axial direction of the multipolar magnet of the magnetic encoder, the protective cover being fitted to and attached to a peripheral surface of the non-rotating side member facing the rotating member. A circle facing the surface through a gap The seal member is attached to the non-rotating side member and has a mandrel-use seal portion that seals a gap between the mandrel of the magnetic encoder and the seal member. As a result, the surface of the magnetic encoder or sensor can be prevented from being damaged, and sufficient sealing performance can be secured.

A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the sealing device 1 with a magnetic encoder of this embodiment has one end portion of an annular space formed between an outer member 21 and an inner member 22 of a wheel bearing device 20 that rotate relative to each other. It is to be sealed. The wheel bearing device 20 supports the wheel so as to be rotatable with respect to the vehicle body. In this embodiment, the wheel bearing device 20 is an inner ring rotating type classified as a first generation type, and a double-row outward angular support for driving wheel support. It is a ball bearing type. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle with the wheel bearing device attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.
The wheel bearing device 20 includes an outer member 21 having double-row rolling surfaces 24 on the inner periphery, an inner member 22 having rolling surfaces 25 facing the rolling surfaces 24 on the outer periphery, and these And a double row rolling element 23 interposed between the double row rolling surfaces 24 and 25. The rolling elements 23 are formed of balls, and are held by a holder 26 for each row.

  The outer member 21 is a bearing outer ring serving as a member on the non-rotating side. The outer member 21 is an integral member, and is fitted and fixed to the inner periphery of the knuckle 33 in a suspension device (not shown) of the vehicle body.

  The inner member 22 is a member on the rotation side, and includes a hub 27 having a hub flange 27 a on the outer periphery and a separate inner ring set 29 fitted on the outer periphery of the hub 27. The inner ring set 29 includes two bearing inner rings 29A arranged in the axial direction, and the rolling surfaces 25 of each row are formed on the bearing inner rings 29A. An outer joint member 30 of a constant velocity universal joint is connected to the hub 27. The hub 27 has a central hole 28, and the stem portion 31 of the outer joint member 30 is inserted into the central hole 28. The stem portion 31 has a male screw portion 31a at the tip, and the nut 32 screwed into the male screw portion 31a is pressed against the step surface 27b formed on the outboard side in the central hole 28 of the hub 27. The outer joint member 30 is pressed and connected to the hub 27 on the outboard side.

  A spline groove 28 a is formed in the central hole 28 of the hub 27, and a spline groove 31 c formed on the outer peripheral surface of the stem portion 31 is fitted into the spline groove 28 a. The inner ring set 29 is configured such that the base end surface 31b of the stem portion 31 of the outer joint member 30 is pressed against the inboard side width surface of the split inner ring 29 by tightening the nut 32, thereby Fastened in the direction. The opening end on the inboard side of the annular space formed between the inner and outer members 22 and 21 is sealed with the sealing device 1 with a magnetic encoder of this embodiment. The opening end of the annular space on the outboard side is sealed with another sealing device 1A. A wheel 35 is attached to a hub flange 27 a of the hub 27 with a hub bolt 36 via a brake rotor 34.

  As shown in FIG. 2, the sealing device 1 with a magnetic encoder includes a magnetic encoder 2, a protective cover 3, and a seal member 4. The magnetic encoder 2 includes an annular cored bar 5 fitted and attached to a peripheral surface facing the outer member 21 of the inner member 22 which is a rotation side member in the wheel bearing device 20, and the cored bar. 5 and an annular multipolar magnet 6 fixed to a surface facing the axial direction. The metal core 5 has an L-shaped cross section including a cylindrical portion 5a fitted to the outer peripheral surface of the inner member 22 and a standing plate portion 5b rising from an inboard side end portion of the cylindrical portion 5a. A multipolar magnet 6 formed by vulcanizing and bonding a rubber magnet is fixed to the outward surface of the upright plate portion 5b of the metal core 5. As shown in FIG. 3, the multipolar magnet 6 is a member that is magnetized in a multipolar manner in the circumferential direction, and the magnetic poles S and N are alternately formed. The magnetic poles N and S are formed to have a predetermined pitch p in the pitch circle diameter PCD. In addition to this, the multipolar magnet 6 may be a sintered magnet, a plastic magnet, or the like.

  The magnetic encoder 2 and the magnetic sensor 19 attached to the knuckle 33 that is the non-rotating side member as shown in FIG. 1 constitute a rotation detecting device that detects the rotation of the inner member 22 that is the rotating side member. . The magnetic sensor 19 detects rotation of the magnetic encoder 2 as a sensor target, and is attached through the knuckle 33 in the radial direction. 2, this magnetic sensor 19 has a gap in a detected surface, which is a surface facing the axial direction of the multipolar magnet 6 of the magnetic encoder 2 (here, a surface facing the inboard side), as indicated by a two-dot chain line in FIG. Arranged to face each other.

  The protective cover 3 is fitted and attached to an inner peripheral surface of the outer member 21 that is a non-rotating member that faces the inner member 22, and a gap is formed on the detected surface of the multipolar magnet 6 in the magnetic encoder 2. It is a non-magnetic member made in an annular shape facing each other. The protective cover 3 is made of metal such as nonmagnetic stainless steel, for example. The protective cover 3 has an inverted L-shaped cross section composed of a cylindrical portion 3a fitted to the inner peripheral surface of the outer member 21 and a standing plate portion 3b that falls from an end portion on the inboard side of the cylindrical portion 3a. The standing plate portion 3b faces the multipolar magnet 6 of the magnetic encoder 2 and the magnetic sensor 19 in the axial direction. Thereby, the to-be-detected surface of the multipolar magnet 6 in the magnetic encoder 2 is covered with the standing plate portion 3b of the protective cover 3 through the gap. Further, since the surface of the magnetic sensor 19 facing the multipolar magnet 6 and the upright plate portion 3b of the protective cover 3 do not rotate relative to each other, no foreign matter is dragged on the sensor surface.

  The seal member 4 is a member that is attached to an outer member 21 that is a non-rotating side member and seals a gap between the core metal 5 of the magnetic encoder 2 and the seal member 4. 7 and a cored bar utilization seal portion 8 made of an elastic body such as rubber fixed to the cored bar 7. The cored bar 7 falls from the cylindrical part 7a fitted to the inner peripheral surface of the cylindrical part 3a of the cored bar 3 in the protective cover 3 and the outboard side end of the cylindrical part 7a, and the core in the magnetic encoder 2 It is made into the reverse L shape of a cross section which consists of the standing board part 7b which faces the surface which faces the outboard side of the standing board part 5a of the gold | metal | money 5. The tip of the cylindrical portion 7 a of the core metal 7 is in contact with the standing plate portion 3 b of the protective cover 3. The cored bar seal 8 made of an elastic body has one side lip 8a and two radial lips 8b and 8c. The side lip 8 a extends obliquely from the standing plate portion 7 b of the core bar 7 toward the outer diameter side, and the tip contacts the standing plate portion 5 b of the core bar 5 in the magnetic encoder 2. The two radial lips 8b and 8c are arranged side by side in the axial direction, and one radial lip 8b is inclined from the tip of the standing plate portion 7b of the core metal 7 toward the standing plate portion 5b side of the core metal 5 in the magnetic encoder 2. The other radial lip 8c extends to the inner diameter side, extends from the tip of the standing plate portion 7b of the core metal 7 to the diagonal inner diameter side on the opposite side to the standing plate portion 5b of the core metal 5, and each tip is respectively It contacts the cylindrical part 5a of the cored bar 5.

  In the assembly of the sealing device 1 with the magnetic encoder to the bearing, the magnetic encoder 2, the protective cover 3, and the seal member 4 are combined with each other as shown in FIG. This is done by press-fitting the protective cover 3 into the outer member 21 in parallel.

Thus, in the sealing device 1 with the magnetic encoder having the above-described configuration, an annular ring fitted and attached to the peripheral surface of the non-rotating side member (outer member 21) facing the rotating side member (inner member 22). The protective cover 3 of the non-rotating side member (outer member 21) in the rotating side member (inner member 22).
) Is opposed to the detection surface of the multipolar magnet 6 of the annular magnetic encoder 2 that is fitted and attached to the peripheral surface opposite to the surface of the multipolar magnet 6 of the magnetic encoder 2. The detection surface is covered with the protective cover 3. Therefore, it is possible to prevent foreign matters from being mixed between the multipolar magnet 6 of the magnetic encoder 2 and the protective cover 3. In addition, since the magnetic sensor 19 and the protective cover 3 do not rotate relative to each other, foreign matter is not dragged on the sensor surface. Therefore, it is possible to prevent the magnetic encoder 2 and the surface of the magnetic sensor 19 from being damaged due to foreign matter mixing.
Further, since the core metal utilization seal portion 8 of the seal member 4 attached to the non-rotating side member (outer member 21) seals between the core metal 2 of the magnetic encoder 2 and the seal member 4. Sufficient sealing performance can be secured.
Further, since the tip of the cylindrical portion 7 a of the core metal 7 of the seal member 4 is brought into contact with the standing plate portion 3 b of the protective cover 3, the standing plate portion 7 b of the core metal 7 of the seal member 4 and the protective cover 3 stand up. The space | interval of the board part 3b can be set to a fixed dimension. Therefore, it is possible to easily press fit the cylindrical portion 7a of the core metal 7 of the seal member 4 into the cylindrical portion 3a of the protective cover 3.

  FIG. 4 shows another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the protection cover 3 and the core metal 5 of the magnetic encoder 2 are disposed on the periphery of the upright plate portion 3 b of the protection cover 3 that faces the peripheral surface of the inner member 22 that is the rotation side member. A protective cover / core metal seal portion 9 made of an elastic material such as rubber is provided for sealing between the upright plate portion 5b. Here, the seal cover 9 between the protective cover and the metal core is slidably contacted on the inner diameter side with respect to the position of the multipolar magnet 6 of the standing plate part 5 b of the metal core 5 of the magnetic encoder 2. Other configurations are the same as those in the embodiment of FIG.

  Thus, the multipolar magnet of the magnetic encoder 2 is formed by sealing the space between the protective cover 3 and the core metal 5 of the magnetic encoder 2 with the protective cover / core seal 9 provided at the periphery of the protective cover 3. It is possible to reliably prevent foreign matters from being mixed into the gap between 6 and the standing plate portion 3b of the protective cover 3.

  In this embodiment, the outer diameter φA of the curved surface portion 5a of the metal core 5 in the magnetic encoder 2 is smaller than the inner diameter φB of the protective cover / core metal seal portion 9 (φA <φB). Thereby, in the operation | work which assembles this sealing device 1 with a magnetic encoder to a bearing, the contact allowance of the jig | tool which press-fits the magnetic encoder 2 to the inner member 22 can fully be ensured, and a press-fit process can be performed easily.

  FIG. 5 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the protective cover 3 and the core metal of the magnetic encoder 2 are disposed on the periphery of the upright plate portion 3 b of the protective cover 3 that faces the peripheral surface of the inner member 22 that is the rotation side member. A protective cover / rotation side member seal portion 10 made of an elastic body such as rubber that seals between the inner surface of the inner member 22 that is a rotation side member 5 is fitted is provided. Here, the protective cover / rotary member seal part 10 is in sliding contact with the peripheral surface of the inner member 22. Other configurations are the same as those in the embodiment of FIG.

  Thus, the protective cover 3 and the rotation-side member seal portion 10 provided at the periphery of the protection cover 3 seal the gap between the protection cover 3 and the inner member 22 that is the rotation-side member, thereby providing magnetic properties. Foreign matter can be reliably prevented from entering the gap between the multipolar magnet 6 of the encoder 2 and the upright plate portion 3 b of the protective cover 3.

  FIG. 6 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 4, of the two radial lips 8 b and 8 c in the core metal utilization seal 8 of the seal member 4, the magnetic encoder 2 is inclined diagonally to the opposite side to the standing plate portion 5 b of the core metal 5. The radial lip 8c extending toward the inner diameter side is brought close to the cylindrical portion 5a of the core metal 5 with a gap forming a non-contact seal. Other configurations are the same as those in the embodiment of FIG.

  The radial lip 8c is a lip that has a function of preventing grease leakage, but it can have a function of preventing grease leakage even if it constitutes a non-contact seal as described above. In addition, by using the radial lip 8c as a non-contact seal, the contact resistance of the core metal utilization seal portion 8 of the seal member 4 to the core metal 5 of the magnetic encoder 2 can be reduced accordingly.

  FIG. 7 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, the side lip 8a in the core metal utilization seal 8 of the seal member 4 is omitted in the embodiment of FIG. Other configurations are substantially the same as those of the embodiment of FIG.

  Also in this case, the contact resistance with respect to the core metal 5 of the magnetic encoder 2 of the core metal utilization seal portion 8 of the seal member 4 can be reduced by the amount corresponding to the omission of the side lip 8a.

  FIG. 8 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 4, of the two radial lips 8 b and 8 c in the core metal utilization seal 8 of the seal member 4, the inner diameter side is inclined to the vertical plate portion 5 b side of the core metal 5 of the magnetic encoder 2. The radial lip 8b extending inward is changed to a second side lip 8b ′ that extends obliquely to the outer diameter side and has a tip that contacts the upright plate portion 5b of the metal core 5. Other configurations are the same as those in the embodiment of FIG.

  FIG. 9 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 4, rubber or the like that prevents water from entering between the outer member 21 that is a non-rotating side member and the cylindrical portion 3 a of the protective cover 3 fitted thereto. A protective cover / non-rotating side member seal portion 11 made of an elastic member is integrally formed with the protective cover / core seal portion 9. Here, the protective cover / non-rotating side member seal portion 11 is disposed on the outer periphery of the corner portion where the upright plate portion 3 b falls from the cylindrical portion 3 a of the protective cover 3. Other configurations are the same as those in the embodiment of FIG.

  Thus, the non-rotating side member is formed by the protective cover / non-rotating side member seal portion 11 formed integrally with the protective cover / core metal seal portion 9 made of an elastic body such as rubber provided on the periphery of the protective cover 3. Is sealed between the outer member 21 and the cylindrical portion 3a of the protective cover 3 fitted thereto, water enters the bearing from between the outer member 21 and the cylindrical portion 3a of the protective cover 3. Can be surely prevented.

  FIG. 10 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 9, the protective cover / non-rotating side member seal portion 11 is provided on the protective cover 3 separately from the protective cover / core seal portion 9. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 11 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, the protective cover / non-rotating side member seal portion 11 separated from the protective cover / core metal seal portion 9 in the embodiment of FIG. 10 faces the outboard side of the cylindrical portion 3a of the protective cover 3. It arrange | positions at the edge part outer periphery. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 12 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the peripheral edge of the upright plate portion 3 b of the protective cover 3 that faces the peripheral surface of the inner member 22 that is the rotation-side member is not in contact with the peripheral surface of the inner member 22. Only the gaps that make up the contact seal are open and close together. Other configurations are the same as those in the embodiment of FIG.

  In this way, by forming a non-contact seal between the peripheral edge of the protective cover 3 and the peripheral surface of the inner member 22, the space between the multipolar magnet 6 of the magnetic encoder 2 and the upright plate portion 3 b of the protective cover 3 is obtained. Foreign matter can be prevented from entering the gap, and the contact resistance can also be reduced.

  FIG. 13 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the peripheral edge of the upright plate portion 3 b of the protective cover 3 that faces the peripheral surface of the inner member 22 that is the rotation side member is used as the upright plate portion of the core metal 5 in the magnetic encoder 2. Only a gap constituting a non-contact seal is opened with respect to 5b. Other configurations are the same as those in the embodiment of FIG.

  In this way, by forming a non-contact seal between the peripheral edge of the protective cover 3 and the vertical plate portion 5b of the core 5 in the magnetic encoder 2, the multipolar magnet 6 of the magnetic encoder 2 and the vertical plate of the protective cover 3 are formed. It is possible to prevent foreign matters from entering the gap between the portion 3b.

  FIG. 14 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the inner side which is the rotating side member when the excessive load is applied to the peripheral edge of the standing plate portion 3 b of the protective cover 3 facing the peripheral surface of the inner member 22 which is the rotating side member. A metal contact preventing member 12 made of an elastic body such as rubber for preventing the protective cover 3 from coming into metal contact with the member 22 is provided. Other configurations are the same as those in the embodiment of FIG.

  As described above, when the metal contact prevention member 12 made of an elastic body such as rubber is provided on the periphery of the protective cover 3, an excessive load is applied such that the space between the outer member 21 and the inner member 22 of the bearing is reduced. However, since the metal contact preventing member 12 only needs to elastically contact the peripheral surface of the inner member 22, the protective cover 3 can be prevented from contacting the peripheral surface of the inner member 22 with metal.

  In this embodiment, the clearance C between the metal contact prevention member 12 and the peripheral surface of the inner member 22 at the periphery of the protective cover 3 is set to the multipole magnet 6 of the magnetic encoder 2 and the upright plate portion 3b of the protective cover 3. (C <D) which is smaller than the gap dimension D. As a result, a non-contact seal is formed between the metal contact preventing member 12 and the peripheral surface of the inner member 22 at the periphery of the protective cover 3, so that the multipolar magnet 6 of the magnetic encoder 2 and the standing plate portion of the protective cover 3 It is also possible to prevent foreign matter from being mixed into the gap between 3b. Even if foreign matter is mixed in, the size of the foreign matter is smaller than the size of the gap between the multipolar magnet of the magnetic encoder and the protective cover, so that the surface of the magnetic encoder is not damaged.

  FIG. 15 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the metal core 5 of the magnetic encoder 2 is applied to the peripheral edge of the upright plate portion 3 b of the protective cover 3 facing the peripheral surface of the inner member 22 that is a rotation side member when an excessive load is applied. A metal contact preventing member 12A made of an elastic body such as rubber for preventing the protective cover 3 from coming into metal contact with the standing plate portion 5b is provided. Other configurations are the same as those in the embodiment of FIG.

  As described above, when the metal contact preventing member 12A made of an elastic material such as rubber is provided on the periphery of the protective cover 3, the space between the standing plate portion 5b of the core metal 5 of the magnetic encoder 2 and the standing plate portion 3b of the protective cover 3 is provided. Even when an excessive load is applied such that the metal contact preventing member 12A is in elastic contact with the upright portion 5b of the core bar 5 of the magnetic encoder 2, the protective cover 3 is attached to the core bar 5 of the magnetic encoder 2. Can be prevented from coming into contact with metal.

  In this embodiment, the outer diameter φA of the cylindrical portion 5a of the core 5 in the magnetic encoder 2 is smaller than the inner diameter φB of the metal contact preventing member 12A provided on the periphery of the protective cover 3 (φA <φB). Thereby, in the operation | work which assembles this sealing device 1 with a magnetic encoder to a bearing, the contact allowance of the jig | tool which press-fits the magnetic encoder 2 to the inner member 22 can fully be ensured, and a press-fit process can be performed easily.

  FIG. 16 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 15, the clearance E between the metal contact prevention member 12A on the periphery of the protective cover 3 and the standing plate portion 5b of the core metal 5 in the magnetic encoder 2 is set to The clearance dimension D between the pole magnet 6 and the upright plate portion 3b of the protective cover 3 is smaller (E <D). Other configurations are the same as those in the embodiment of FIG.

  By setting the dimensions in this way, a non-contact seal is formed between the metal contact preventing member 12A on the periphery of the protective cover 3 and the upright plate portion 5b of the core metal 5 in the magnetic encoder 2, so that the magnetic encoder 2 Foreign matter can be prevented from entering the gap between the multipolar magnet 6 and the upright plate portion 3 b of the protective cover 3.

  FIG. 17 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 15, of the two radial lips 8 b and 8 c in the core metal utilization seal 8 of the seal member 4, the magnetic encoder 2 is inclined diagonally to the opposite side to the standing plate portion 5 b of the core metal 5. The radial lip 8c extending toward the inner diameter side is brought close to the cylindrical portion 5a of the core metal 5 with a gap forming a non-contact seal. Other configurations are the same as those in the embodiment of FIG.

  Thus, even if the radial lip 8c constitutes a non-contact seal, a grease leakage preventing function can be provided. In addition, by using the radial lip 8c as a non-contact seal, the contact resistance of the core metal utilization seal portion 8 of the seal member 4 to the core metal 5 of the magnetic encoder 2 can be reduced accordingly.

  FIG. 18 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, the side lip 8a in the core metal utilization seal 8 of the seal member 4 is omitted in the embodiment of FIG. Other configurations are substantially the same as those of the embodiment of FIG.

  In this case, the contact resistance with respect to the core metal 5 of the magnetic encoder 2 of the core metal utilization seal portion 8 of the seal member 4 can be reduced by the amount that the side lip 8a is omitted.

  FIG. 19 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 15, of the two radial lips 8 b and 8 c in the core metal utilization seal 8 of the seal member 4, the inner diameter side is inclined to the vertical plate portion 5 b side of the core metal 5 of the magnetic encoder 2. The radial lip 8b extending inward is changed to a second side lip 8b ′ that extends obliquely to the outer diameter side and has a tip that contacts the upright plate portion 5b of the metal core 5. Other configurations are the same as those in the embodiment of FIG.

  FIG. 20 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 15, rubber or the like that prevents water from entering between the outer member 21 that is a non-rotating member and the cylindrical portion 3 a of the protective cover 3 fitted thereto. A protective cover / non-rotating side member seal 11 made of an elastic body is integrally formed with the metal contact preventing member 12A. Here, the protective cover / non-rotating side member seal portion 11 is disposed on the outer periphery of the corner portion where the upright plate portion 3 b falls from the cylindrical portion 3 a of the protective cover 3. Other configurations are the same as those in the embodiment of FIG.

  Thus, the protective cover / non-rotating side member seal portion 11 formed integrally with the metal contact prevention member 12A made of an elastic body such as rubber provided on the peripheral edge of the protective cover 3 is an outer side that is a non-rotating side member. Sealing between the member 21 and the cylindrical portion 3a of the protective cover 3 fitted thereto ensures that water enters the bearing from between the outer member 21 and the cylindrical portion 3a of the protective cover 3. Can be prevented.

  FIG. 21 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 20, the protective cover / non-rotating side member seal portion 11 is provided on the protective cover 3 separately from the metal contact preventing member 12A. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 22 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 21, the protective cover / non-rotating side member seal portion 11 separated from the metal contact preventing member 12A is disposed on the outer periphery of the end portion of the protective cover 3 facing the outboard side. It is arranged. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 23 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 2, the two radial lips 8 b and 8 c of the core metal utilization seal portion 8 in the seal member 4 are not the cylindrical portion 5 a of the core metal 5 of the magnetic encoder 2 but the rotation side member. The inner member 22 is in sliding contact with the peripheral surface to which the magnetic encoder 2 is attached. For this reason, the cylindrical part 5a of the metal core 5 of the magnetic encoder 2 is projected to the fixed surface side (inboard side) of the multipolar magnet 6 with respect to the standing plate part 5b.

  As described above, the two radial lips 8b and 8c of the seal member 4 are brought into sliding contact with the peripheral surface of the inner member 22, whereby the cross-sectional height of the sealing device 1 with a magnetic encoder can be reduced. Further, since the cylindrical portion 5a of the metal core 5 of the magnetic encoder 2 is projected to the fixed surface side (inboard side) of the multipolar magnet 6 with respect to the standing plate portion 5b, the cylindrical portion 5a of the metal core 5 is provided. The radial lips 8b and 8c can be brought into sliding contact with the peripheral surface of the inner member 22 without being obstructed by the above. Moreover, in the operation | work which assembles the sealing device 1 with a magnetic encoder to a bearing, the jig | tool which press-fits the magnetic encoder 2 to the inner member 22 can be applied to the end surface part of the metal core 5, and a press-fit process can be performed easily. .

  FIG. 24 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 23, the protective cover 3 and the core metal 5 of the magnetic encoder 2 are disposed on the periphery of the standing plate portion 3 b of the protective cover 3 that faces the peripheral surface of the inner member 22 that is the rotation side member. A protective cover / core metal seal portion 9 made of an elastic material such as rubber is provided for sealing between the upright plate portion 5b. Here, the protective cover / core metal seal portion 9 is in sliding contact with the inner diameter side of the multipolar magnet 6 of the standing plate portion 5 b of the core metal 5 of the magnetic encoder 2. Other configurations are the same as those in the embodiment of FIG.

  Thus, by sealing between the protective cover 3 and the core metal 5 of the magnetic encoder 2 with the protective cover / core metal seal portion 9 made of an elastic material such as rubber provided at the periphery of the protective cover 3, Foreign matter can be reliably prevented from entering the gap between the multipolar magnet 6 of the magnetic encoder 2 and the upright plate portion 3b of the protective cover 3.

  FIG. 25 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 24, the protective cover / core seal 9 provided on the peripheral edge of the upright plate portion 3b of the protective cover 3 facing the peripheral surface of the inner member 22 which is a rotation side member is provided. The cylindrical portion 5a of the core 5 of the magnetic encoder 2 is slidably contacted. Other configurations are the same as those of the embodiment of FIG.

  Even in such a configuration, it is possible to reliably prevent foreign matters from entering the gap between the multipolar magnet 6 of the magnetic encoder 2 and the upright plate portion 3b of the protective cover 3.

  FIG. 26 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 23, on the periphery of the upright plate portion 3 b of the protective cover 3 that faces the peripheral surface of the inner member 22 that is the rotation side member, There is provided a non-contact seal portion 9A between the protective cover and the cored bar made of an elastic body such as rubber that is close to the gap constituting the non-contact seal. Other configurations are the same as those in the embodiment of FIG.

  In this way, by forming a non-contact seal between the protective cover / core non-contact seal portion 9A provided on the periphery of the protective cover 3 and the core metal 5 of the magnetic encoder 2, the multi-pole of the magnetic encoder 2 can be obtained. Foreign matter can be prevented from entering the gap between the magnet 6 and the upright plate portion 3 b of the protective cover 3.

  FIG. 27 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 25, of the two radial lips 8b, 8c in the core metal utilization seal 8 of the seal member 4, the radial lip 8c extending diagonally to the inner diameter side on the opposite side to the magnetic encoder 2 is provided. Only a gap that constitutes a non-contact seal is opened and brought close to the peripheral surface of the inner member 22. Other configurations are the same as those in the embodiment of FIG.

  Thus, even if the radial lip 8c constitutes a non-contact seal, a grease leakage preventing function can be provided. Moreover, the contact resistance with respect to the inner member 22 of the seal | sticker utilization seal | sticker part 8 of the sealing member 4 can be reduced so much by making the radial lip 8c into a non-contact seal.

  FIG. 28 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, the side lip 8a in the core metal utilization seal 8 of the seal member 4 is omitted in the embodiment of FIG. Other configurations are substantially the same as those in the embodiment of FIG.

  In this case, the contact resistance with respect to the inner member 22 that is the rotation side member of the seal member 4 can be reduced by the amount that the side lip 8a is omitted.

  FIG. 29 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 25, of the two radial lips 8b and 8c in the core metal utilization seal 8 of the seal member 4, the inner diameter side is inclined to the vertical plate portion 5b side of the metal core 5 of the magnetic encoder 2. The radial lip 8b extending inward is changed to a second side lip 8b ′ that extends obliquely to the outer diameter side and has a tip that contacts the upright plate portion 5b of the metal core 5. Other configurations are the same as those in the embodiment of FIG.

  FIG. 30 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 25, rubber or the like for preventing water from entering between the outer member 21 which is a non-rotating member and the cylindrical portion 3a of the protective cover 3 fitted thereto. A protective cover / non-rotating side member seal portion 11 made of an elastic member is integrally formed with the protective cover / core seal portion 9. Here, the protective cover / non-rotating side member seal portion 11 is disposed on the outer periphery of the corner portion where the upright plate portion 3 b falls from the cylindrical portion 3 a of the protective cover 3. Other configurations are the same as those in the embodiment of FIG.

  Thus, the non-rotating side member is formed by the protective cover / non-rotating side member seal portion 11 formed integrally with the protective cover / core metal seal portion 9 made of an elastic body such as rubber provided on the periphery of the protective cover 3. Is sealed between the outer member 21 and the cylindrical portion 3a of the protective cover 3 fitted thereto, water enters the bearing from between the outer member 21 and the cylindrical portion 3a of the protective cover 3. Can be surely prevented.

  FIG. 31 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 30, the protective cover / non-rotating side member seal portion 11 is provided on the protective cover 3 separately from the protective cover / core seal portion 9. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 32 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 31, the protective cover / non-rotating side member seal portion 11 separated from the protective cover / core metal seal portion 9 faces the outboard side of the cylindrical portion 3 a in the protective cover 3. It arrange | positions at the edge part outer periphery. The function and other configurations of the protective cover / non-rotating side member seal portion 11 are the same as those in the embodiment of FIG.

  FIG. 33 shows still another embodiment of the sealing device 1 with a magnetic encoder. In this embodiment, in the embodiment of FIG. 25, the cylindrical portion 5a of the core metal 5 of the magnetic encoder 2 is set to a predetermined dimension E more than the contact position of the protective cover / core metal seal 9 provided on the periphery of the protective cover 3. Only protrude on the inboard side.

  Thereby, in the operation | work which assembles this sealing device 1 with a magnetic encoder to a bearing, the contact allowance of the jig | tool which press-fits the magnetic encoder 2 to the inner member 22 can fully be ensured, and a press-fit process can be performed easily.

It is sectional drawing of the wheel bearing apparatus provided with the sealing device with a magnetic encoder concerning 1st Embodiment of this invention. It is sectional drawing of the sealing device with the magnetic encoder. It is explanatory drawing of the magnetic pole which shows a magnetic encoder from the front. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of other embodiment of the sealing device with a magnetic encoder. It is sectional drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sealing device 2 with a magnetic encoder 2 ... Magnetic encoder 3 ... Protective cover 3a ... Cylindrical part 3b ... Standing plate part 4 ... Sealing member 5 ... Core metal 5a ... Cylindrical part 5b ... Standing plate part 6 ... Multipolar magnet 7 ... Core metal 7a ... Cylindrical part 7b ... Standing plate part 8 ... Core metal seals 8a, 8b '... Side lips 8b, 8c ... Radial lip 9 ... Protective cover / core metal seal part 9A ... Non-contact seal between protective cover / core metal Numeral 10: Protective cover / rotating side member seal portion 11: Protective cover / non-rotating side member seal portion 12, 12A ... Metal contact preventing member 19 ... Magnetic sensor 21 ... Outer member 22 ... Inner member

Claims (11)

A magnetic encoder provided between an inner member and an outer member positioned on the outer periphery of the inner member and rotating relative to the inner member to seal between the inner member and the outer member In a sealed device,
A magnetic encoder, a protective cover, and a seal member;
The magnetic encoder includes an annular cored bar fitted and attached to a peripheral surface facing the non-rotating side member of the rotating side member of the inner member and the outer member, and the axial direction of the cored bar An annular multipolar magnet having a plurality of magnetic poles that are fixed to the surface facing and arranged in the circumferential direction,
The protective cover is fitted and attached to a peripheral surface of the non-rotating side member that faces the rotating member, and a surface to be detected is a surface facing the axial direction of the multipolar magnet of the magnetic encoder via a gap. It is an annular ring facing each other,
The seal member includes a core metal utilization seal portion that is attached to the non-rotating side member and seals a gap between the core metal of the magnetic encoder and the seal member.
A sealing device with a magnetic encoder.   2. The sealing device with a magnetic encoder according to claim 1, wherein the inward member is a rotation side member.   3. The protective cover / core metal seal portion formed of an elastic body that seals between the protective cover and the core of the magnetic encoder according to claim 1 or 2, on the periphery of the rotating side member of the protective cover. Sealing device with magnetic encoder provided.   3. The protective cover / rotation side member sealing portion made of an elastic body that seals between the protection cover and the peripheral surface of the rotation side member fitted with the core bar of the magnetic encoder according to claim 1 or 2. Sealing device with magnetic encoder provided.   3. The sealing device with a magnetic encoder according to claim 1, wherein a peripheral edge of the protective cover on the rotating side member side is brought close to a peripheral surface of the rotating side member by a gap forming a non-contact seal. .   3. The sealing device with a magnetic encoder according to claim 1, wherein a peripheral edge of the protective cover on the rotating side member side is brought close to a core metal of the magnetic encoder with a gap forming a non-contact seal.   The sealing device with a magnetic encoder according to claim 1, wherein the seal member is provided with a radial lip that is slidably contacted with a peripheral surface of the rotary member on which the magnetic encoder is mounted.   The core of the magnetic encoder according to claim 7, comprising a cylindrical portion that fits on a peripheral surface of the rotating side member, and a vertical plate portion that extends from the cylindrical portion and faces in the axial direction. A sealing device with a magnetic encoder that protrudes toward the fixed surface of the multipole magnet with respect to the vertical plate.   9. The water according to claim 1, wherein the water contacts the non-rotating side member fixed to the protective cover, and water enters a fitting portion between the protective cover and the non-rotating side member. A sealing device with a magnetic encoder provided with a protective cover and a non-rotating side member sealing portion made of an elastic body to prevent this.   11. The sealing device with a magnetic encoder according to claim 1, wherein a peripheral surface side end surface of the seal member facing the rotation side member and an inner diameter side end surface of the protective cover are in close contact with each other.   3. The sealing device with a magnetic encoder according to claim 1, wherein the inner diameter portion of the protective cover is larger than the inner diameter portion of the magnetic encoder.

Images