JP5624506B2 - Rolling bearing with filter - Google Patents

Description

  The present invention relates to an oil-lubricated rolling bearing, and more particularly to a filter-equipped rolling bearing that is oil-lubricated through a filter.

  A rolling bearing incorporated in a power transmission device such as a transmission or a reduction gear of an automobile is usually incorporated so that the lower outer periphery is immersed in oil stored in a case and is lubricated by the stored oil.

  At this time, the oil stored in the case of the power transmission device contains foreign matter such as gear wear powder, and when the foreign matter enters the inside of the rolling bearing, the foreign matter bites into the raceway surface and Separation occurs on the rolling surface, which reduces the durability of the rolling bearing.

  For this reason, in the power transmission device as described above, for example, as described in Patent Document 1, a filter with an oil filtering filter is provided at the end opening of the bearing space formed between the outer ring and the inner ring. In many cases, rolling bearings are used.

Japanese Utility Model Publication No. 5-77620

  By the way, in the rolling bearing with filter described in Patent Document 1, the filter has only a function of capturing foreign matter contained in the stored oil by the filter and preventing foreign matter from entering the bearing space. The foreign matter captured by the filter and adhering to the outer surface of the filter is removed from the filter and returned to the stored oil when rotating in the stored oil, and the amount of foreign matter in the stored oil cannot be reduced. . Further, the foreign matter is mostly gear wear powder, and the wear powder gradually increases with time, so that there is a problem that the filter is easily clogged and lubrication is liable to be caused by the clogging.

  The subject of this invention is providing the rolling bearing with a filter which enabled it to suppress the clogging of a filter.

In order to solve the above problems, in the present invention, a pair of race rings having different diameters are arranged inside and outside, a rolling element is incorporated between the outer race ring and the inner race ring, and the outer race ring and An oil passage hole is provided in a seal member that covers at least one end opening of the bearing space formed between the inner race rings, and a foreign matter contained in the stored oil is captured by a filter that covers the oil passage hole, and the inside of the bearing space. In a rolling bearing with a filter that prevents entry of foreign matter into the seal member, a plurality of oil passage holes provided in the seal member, each of the plurality of oil passage holes is covered with a filter, A configuration in which a magnet attachment portion is provided between adjacent oil passage holes and a permanent magnet is provided in the magnet attachment portion is adopted.

  As described above, by providing a permanent magnet around the filter, magnetic wear powder mixed in the stored oil can be adsorbed and held by the permanent magnet.

  As a result, the amount of foreign matter in the stored oil can be reduced, clogging of the filter can be prevented, and deterioration in the lubrication performance can be suppressed.

  Here, the seal member is a seal in which a rubber seal is fixed to the inner peripheral portion of the core metal attached to the end portion of the outer race ring, and the inner peripheral portion of the rubber seal is in elastic contact with the outer end portion of the inner race ring. It may be a bearing seal provided with a lip, or a rubber seal is fixed to the outer periphery of a cored bar attached to the end of the inner race, and the inner circumference of the end of the outer race is fixed to the outer periphery of the rubber seal. It may be a bearing seal provided with a seal lip that is elastically contacted with the seal.

  In the use of the bearing seal as described above, a plurality of oil passage holes are formed in the core metal, a magnet mounting portion is provided between adjacent oil passage holes, each of the plurality of oil passage holes is covered with the filter, By providing a permanent magnet in the magnet mounting portion, it is possible to assemble the permanent magnet at the same time as the assembly of the bearing seal with filter, and to facilitate the assembly of the permanent magnet.

  In addition, in the use of the bearing seal as described above, the magnet mounting portion is a through hole, the permanent magnet is mounted on the inner surface of the cored bar to cover the magnet mounting portion, or the magnet mounting portion is a recess, and the recess is closed. By attaching a permanent magnet to the end portion, the magnet attachment portion can be made into a magnetic powder reservoir, so that a lot of magnetic wear powder can be adsorbed and held.

  The seal member is not limited to the bearing seal as described above. For example, an inward flange is provided at one end of a cylindrical portion fitted to the end of the outer race, and a minute gap is formed between the inner and outer diameter surfaces of the inner race. It may be a slinger in which the inner cylinder part to be formed is formed, or an outer flange is provided at one end of the cylindrical part fitted to the end of the inner race, and the outer diameter of the outer flange The slinger may be formed with an outer tube portion that forms a minute gap between the inner diameter surfaces of the end portions of the outer race.

  The seal member includes a cylindrical portion fitted to the end of the outer race ring, a small diameter cylindrical surface formed at the end of the inner race ring and connected to one end of the cylindrical portion, and the small diameter cylinder. It may consist of a slinger having an inward flange that forms a labyrinth with an end face that faces radially inward from the end of the face.

  In the adoption of any of the slinger as described above, a plurality of oil passage holes are formed in the inward (outward) flange, a magnet mounting portion is provided between adjacent oil passage holes, By covering with a filter and providing a permanent magnet at the magnet mounting portion, the permanent magnet can be assembled at the same time as the slinger is assembled, and the assembly of the permanent magnet can be facilitated.

  Even when a slinger is used, the magnet mounting part can be made into a magnetic powder reservoir by using the magnet mounting part as a through-hole and mounting the permanent magnet on the inner surface of the cored bar to cover the magnet mounting part. Many magnetic wear powders can be adsorbed and held.

  In the present invention, as described above, by attaching the permanent magnet to the periphery of the filter provided on the seal member, the magnetic wear powder mixed into the stored oil can be adsorbed and held by the permanent magnet. For this reason, the amount of magnetic wear powder mixed in the stored oil can be reduced, and clogging of the filter and deterioration of the lubricating performance can be suppressed.

Sectional drawing which shows an example of use of the rolling bearing with a filter concerning this invention Sectional view along the line II-II in FIG. Sectional drawing which expands and shows a part of FIG. Sectional view along line IV-IV in Fig. 1 Sectional drawing which shows 2nd Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows 3rd Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows 4th Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows 5th Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows 6th Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows 7th Embodiment of the rolling bearing with a filter which concerns on this invention Sectional drawing which shows the other example of a magnet attaching part

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 4 show an example of use in which a wheel bearing device with a filter according to the present invention is incorporated in a wheel bearing device in a construction machine such as a dump truck and the wheel wheel is rotatably supported. In other words, a rolling bearing A with a filter is attached to a fixed spindle 1 serving as an axle, and the wheel 2 is rotatably supported by the rolling bearing A with a filter.

  Here, although omitted in the figure, stored oil is stored inside the wheel 2 and the lower part of the outer periphery of the rolling bearing with filter A is immersed in the stored oil, and the rolling bearing A with filter is immersed in the stored oil. Oil-lubricated.

  As shown in FIG. 2, the rolling bearing A with a filter incorporates an inner ring 12 as an inner race ring inside an outer ring 11 as an outer race ring, and a tapered roller as a rolling element between the outer ring 11 and the inner ring 12. 13 is a tapered roller bearing in which the tapered roller 13 is held by a cage 14.

  The inner ring 12 has a large brim 12a and a small brim 12b on the outer periphery, and a bearing seal 15 as a seal member is incorporated between an outer diameter surface of the large brim 12a and an inner diameter surface of one end portion of the outer ring 11, and the bearing seal 15 Thus, one end opening of the bearing space formed between the outer ring 11 and the inner ring 12 is sealed.

  As shown in FIGS. 3 and 4, the bearing seal 15 includes a cored bar 16 and a rubber seal 17 fixed to the cored bar 16. The metal core 16 has a configuration in which an inward flange 16b is provided at one end of a cylindrical portion 16a. The cylindrical portion 16a is fitted to a seal fitting surface 18 formed on the inner periphery of one end of the outer ring 11, and the seal The metal core 16 is retained by the engagement of the seal mounting groove 19 formed on the fitting surface 18 and the protrusion 20 formed on the outer periphery of the other end of the cylindrical portion 16a, and the bearing seal 15 is in the mounted state. .

  Here, the cored bar 16 is a synthetic resin molded product, but may be made of metal.

  The rubber seal 17 is made of rubber having excellent wear resistance and oil resistance. A nitrile rubber can be mentioned as such rubber. The rubber seal 17 is vulcanized and bonded to the inner peripheral portion of the core metal 16, and an inward seal lip 17 a and an outward seal lip 17 b are provided on the inner peripheral portion. The tip of the inward seal lip 17a is in elastic contact with the inner surface 21a of the seal groove 21 formed on the outer diameter surface of the large brim 12a, while the tip of the outer seal lip 17b is in contact with the seal groove of the large brim 12a. It is in elastic contact with a cylindrical sealing surface 22 formed outside 21.

  As shown in FIG. 1, a plurality of oil passage holes 23 and a plurality of magnet attachment portions 24 are alternately formed in the core metal 16 in the circumferential direction, and each of the oil passage holes 23 and the magnet attachment portions 24 is a circle. It is an arc-shaped through hole. The magnet attachment portion 24 is not limited to the through hole. For example, as shown in FIG. 11, it may consist of an arcuate depression. Further, in the embodiment, the plurality of oil passage holes 23 and the plurality of magnet attachment portions 24 are alternately formed in the circumferential direction, but they may not be arranged alternately.

  As shown in FIGS. 1 and 4, each of the plurality of oil passage holes 23 is covered with a filter 25. Here, the filter 25 is made of glass fiber, but may be made of a metal or synthetic resin mesh. Here, when the filter 25 is attached, it is adhered to the inner surface of the cored bar 16, but may be molded to the cored bar 16 when the cored bar 16 is molded.

  As shown in FIGS. 1 and 3, each of the plurality of magnet attachment portions 24 is covered with a plate-like permanent magnet 26. Here, as the permanent magnet 26, a rubber magnet is used in which a magnetic material such as ferrite is mixed with a rubber material made of nitrile rubber. The permanent magnet 26 is fixed to the inner surface of the cored bar 16 by bonding with the outer peripheral part thereof.

  The rolling bearing with filter shown in the embodiment has the above structure, and when the wheel 2 rotates, the outer ring 11 rotates together with the wheel 2. At this time, since the bearing seal 15 is attached to the outer ring 11, the bearing seal 15 rotates in a state where the outer peripheral lower portion is immersed in the stored oil, and the filter 25 provided on the bearing seal 15 is stored in the stored oil. When rotating inside, the stored oil passes through the filter 25 and enters the bearing space, and the rolling bearing A is lubricated.

  Here, when the stored oil passes through the filter 25, foreign matter mixed in the stored oil is captured by the filter 25. For this reason, foreign matter does not enter the bearing.

  The foreign matter contained in the stored oil contains a lot of magnetic wear powder, and the magnetic wear powder gradually increases with the rotation of the wheel, and the filter 25 is easily clogged by the increase in the magnetic wear powder.

  However, since the permanent magnet 26 is provided in the bearing seal 15 and the permanent magnet 26 rotates in the stored oil, the magnetic wear powder mixed in the stored oil is adsorbed and held by the permanent magnet 26 so that As a result, the magnetic wear powder in the stored stored oil is reduced.

  As a result, the filter 25 is not clogged at an early stage, and clogging of the filter 25 and a decrease in lubrication performance are suppressed.

  Here, since the permanent magnet 26 is configured to cover the magnet mounting portion 24 formed of a through-hole formed in the core metal 16 from the inner surface of the core metal 16, the magnet mounting portion 24 serves as a storage place for magnetic wear powder. The magnetic wear powder can be adsorbed and held.

  Although FIG. 1 thru | or FIG. 4 showed the tapered roller bearing as a rolling bearing, a rolling bearing is not limited to a tapered roller bearing. For example, it may be a cylindrical roller bearing or a deep groove ball bearing.

  Further, in FIGS. 1 to 4, the bearing seal 15 is attached to the outer ring 11 for the rolling bearing to rotate the outer ring. However, in the case of the rolling bearing having the inner ring rotation, the second embodiment shown in FIG. As in the embodiment, the bearing seal 15 is attached to the inner ring 12.

  Here, in the bearing seal 15 shown in FIG. 5, the metal core 31 attached to the outer diameter surface of the end portion of the inner ring 12 has a configuration in which an outward flange 31b is provided at one end portion of the cylindrical portion 31a. An inward seal lip 32a and an outward seal lip 32b are provided on the outer peripheral portion of the rubber seal 32 vulcanized and bonded to the outer peripheral portion of 31b.

  The bearing seal 15 is formed by press-fitting the cylindrical portion 31a into a small-diameter seal fitting surface 33 formed at the end of the outer diameter surface of the large collar 12a of the inner ring 12, and is formed on the inner periphery of the other end portion of the cylindrical portion 31a. The bearing seal 15 is attached by retaining the cored bar 31 by engaging with the protrusion 34 and the seal attachment groove 35 provided on the seal fitting surface 33.

  Further, the tip of the inward seal lip 32a provided on the outer periphery of the rubber seal 32 is in elastic contact with the inner surface 36a of the seal groove 36 formed on the inner diameter surface of the end of the outer ring 11, and the tip of the outward seal lip 32b. The portion is elastically brought into contact with a seal surface 37 formed outside the seal groove 36.

  Also in the bearing seal 15, as in the bearing seal 15 shown in FIGS. 1 to 4, a plurality of oil passage holes 23 and a magnet mounting portion 24 including a plurality of through holes are alternately formed in the core metal 31 in the circumferential direction. In addition, each of the plurality of oil passage holes is covered with a filter, and each of the plurality of magnet mounting portions 24 is covered with a plate-like permanent magnet 26. In FIG. 5, only the magnet mounting portion 24 and the permanent magnet 26 are shown, and the oil passage holes and the filter are not shown.

  Also in the bearing seal 15 shown in FIG. 5, the magnetic wear powder mixed in the stored oil can be attracted and held by the permanent magnet 26, and an effect can be obtained in preventing clogging of the filter.

  In FIGS. 1 to 5, the bearing seal 15 is shown as a seal member that seals the opening at one end of the bearing space, but the seal member is not limited to the bearing seal 15.

  6 to 10 show other examples of the seal member. In the third embodiment shown in FIG. 6, the slinger 40 attached to the inner diameter surface of the end portion of the outer ring 11 is used as a seal member. The slinger 40 is provided with an inward flange 40b at one end of a cylindrical portion 40a fitted to a seal fitting surface 18 formed on an inner diameter surface of an end portion of the outer ring 11, and an inner ring at an inner diameter portion of the inward flange 40b. The inner cylindrical portion 40c that forms the minute gap 41 between the outer diameter surfaces of the 12 end portions is provided, the cylindrical portion 40a is press-fitted into the seal fitting surface 18, and the other end portion of the cylindrical portion 40a is placed on the outer periphery of the cylindrical portion 40a. The cylindrical portion 40a is prevented from being pulled out by the engagement of the formed protruding portion 42 and the seal mounting groove 19 formed in the seal fitting surface 18 so that the slinger 40 is mounted.

  Here, similarly to the bearing seal 15 shown in FIG. 1, the inward flange 40b of the slinger 40 is provided with a plurality of oil passage holes and a magnet mounting portion 24 composed of a plurality of through holes alternately in the circumferential direction. Each of the plurality of oil passage holes is covered with a filter, and each of the plurality of magnet mounting portions 24 is covered with a plate-like permanent magnet 26. However, the oil passage holes and the filter are not shown. An annular permanent magnet 43 is attached to the inner peripheral portion of the outer surface of the inward flange 40b close to the minute gap 41.

  Also in the slinger 40 shown in FIG. 6, the magnetic wear powder mixed in the stored oil can be adsorbed and held by the permanent magnet 26, and the effect of preventing clogging of the filter can be obtained. Further, since the magnetic wear powder can be adsorbed and held by the permanent magnet 43 attached to the outer surface of the inward flange 40b, a large amount of magnetic wear powder can be adsorbed and held by the permanent magnet 43. It is possible to prevent magnetic wear powder from entering the bearing from 41.

  In the third embodiment shown in FIG. 6, the slinger 40 is attached to the inner diameter surface of the end portion of the outer ring 11, but the outer diameter of the end portion of the outer ring 11 is changed as in the fourth embodiment shown in FIG. A cylindrical portion 40a formed on the outer peripheral portion of the slinger 40 is fitted to a small-diameter seal fitting surface 50 formed on the surface, and a protruding portion 51 formed on the inner periphery of the other end of the cylindrical portion 40a is seal-fitted. You may make it engage with the seal attachment groove | channel 52 formed in the surface 50. FIG.

  Here, in the fourth embodiment shown in FIG. 7, an annular groove 53 is formed on the outer diameter surface of the large collar 12a of the inner ring 12, and an annular permanent magnet 54 is attached to the annular groove 53. The magnetic wear powder is adsorbed and held by 54 to prevent the magnetic wear powder from entering the bearing through the minute gap 41.

  In the fifth embodiment shown in FIG. 8, an outward flange 60b is provided at one end of a cylindrical portion 60a fitted to a seal fitting surface 33 formed at the end of the inner ring 12, and the outward flange 60b. The slinger 60 in which an outer cylindrical portion 60c that forms a minute gap 61 between the end inner diameter surfaces of the outer ring 11 is formed as a seal member.

  Here, similarly to the bearing seal 15 shown in FIG. 1, the inward flange 60b of the slinger 60 is provided with a plurality of oil passage holes and a magnet mounting portion 24 composed of a plurality of through holes alternately in the circumferential direction. Each of the plurality of oil passage holes is covered with a filter, and each of the plurality of magnet attachment portions 24 is covered with a plate-like permanent magnet 26, but the oil passage holes and the filter are not shown. An annular permanent magnet 62 is attached to the outer diameter surface of the outer cylindrical portion 60 c in the vicinity of the minute gap 61.

  Also in the slinger 60 shown in FIG. 8, the magnetic wear powder mixed in the stored oil can be attracted and held by the permanent magnet 26, and the effect of preventing clogging of the filter can be obtained. Further, since the magnetic wear powder can be adsorbed and held by the permanent magnet 62 attached to the outer diameter surface of the outer cylindrical portion 60c, a lot of magnetic wear powder can be adsorbed and held by the permanent magnet 62. It is possible to prevent magnetic wear powder from entering the bearing through the minute gap 61.

  In the sixth embodiment shown in FIG. 9, a slinger 70 having an inward flange 70b provided at one end of a cylindrical portion 70a fitted to a seal fitting surface 50 formed at the end of the outer ring 11 is used as a seal member. Yes. The slinger 70 has a cylindrical portion 70 a fitted to the seal fitting surface 50 of the outer ring 11, and a projecting portion 71 formed on the inner periphery of the end of the cylindrical portion 70 a and a seal mounting groove formed on the seal fitting surface 50. 52 is brought into an attached state. In the mounted state, the inward flange 70b forms a labyrinth 74 between the small diameter cylindrical surface 72 formed at the end of the inner ring 12 and the end surface 73 facing radially outward from the end of the small diameter cylindrical surface 72. doing.

  As in the bearing seal 15 shown in FIG. 1, the inward flange 70 b of the slinger 70 is provided with a plurality of oil passage holes and magnet mounting portions 24 including a plurality of through holes alternately in the circumferential direction. Each of the oil passage holes is covered with a filter, and each of the plurality of magnet mounting portions 24 is covered with a plate-like permanent magnet 26, but the oil passage holes and the filter are not shown.

  In the sixth embodiment shown in FIG. 9, an annular groove 75 is formed in the small diameter cylindrical surface 72 provided on the outer periphery of the large collar 12a of the inner ring 12, and an annular permanent magnet 76 is attached to the annular groove 75. Magnetic wear powder is prevented from entering the bearing from the labyrinth 74.

  Also in the slinger 70 shown in FIG. 9, the magnetic wear powder mixed in the stored oil can be adsorbed and held by the permanent magnet 26, and an effect can be obtained in preventing clogging of the filter. Further, since the magnetic wear powder can be adsorbed and held by the permanent magnet 76 attached to the annular groove 75 of the small diameter cylindrical surface 72, a lot of magnetic wear powder can be adsorbed and held by the permanent magnet 76. It is possible to prevent magnetic wear powder from entering the bearing from the labyrinth 74.

  In FIG. 9, an annular groove 75 is formed in the small-diameter cylindrical surface 72, and the permanent magnet 76 is attached to the annular groove 75. However, as in the seventh embodiment shown in FIG. An annular permanent magnet 77 may be attached to the inner peripheral portion of the inner surface to prevent magnetic wear powder from entering the bearing from the labyrinth 74.

11 Outer ring (outer raceway)
12 Inner ring (inner race)
13 Tapered rollers (rolling elements)
15 Bearing seal (seal member)
16 Metal core 17 Rubber seal 17a Inward seal lip 17b Outward seal lip 23 Oil passage hole 24 Magnet mounting portion 25 Filter 26 Permanent magnet 31 Core metal 32 Rubber seal 32a Inward seal lip 32b Outward seal lip 40 Slinger (seal member)
40a Cylindrical part 40b Inward flange 40c Inner cylinder part 41 Minute gap 43 Permanent magnet 53 Annular groove 54 Permanent magnet 60 Slinger (seal member)
60a cylindrical part 60b outward flange 60c outer cylinder part 61 minute gap 62 permanent magnet 70 slinger (seal member)
70a Cylindrical portion 70b Inward flange 72 Small-diameter cylindrical surface 73 End surface 74 Labyrinth 75 Annular groove 76 Permanent magnet

Claims (15)

A pair of race rings with different diameters are arranged inside and outside, a rolling element is incorporated between the outer race ring and the inner race ring, and at least a bearing space formed between the outer race ring and the inner race ring. With a filter that is provided with an oil passage hole in the seal member that covers one end opening, and that prevents foreign matter from entering the bearing space by capturing foreign matter contained in the stored oil with a filter that covers the oil passage hole. In rolling bearings,
A plurality of oil passage holes are provided in the seal member, each of the plurality of oil passage holes is covered with a filter, and the magnet attachment portion is provided between the adjacent oil passage holes in the seal member, and the magnet attachment portion A rolling bearing with a filter, characterized in that a permanent magnet is provided on the surface.   A seal lip in which a rubber seal is fixed to an inner peripheral portion of a metal core attached to an end portion of the outer raceway, and the seal member is elastically contacted with an outer periphery of the end portion of the inner raceway on the inner peripheral portion of the rubber seal. A plurality of oil passage holes are formed at intervals in the circumferential direction, and a magnet mounting portion is provided between adjacent oil passage holes. The rolling bearing with a filter according to claim 1, wherein each of the oil passage holes is covered with the filter, and a permanent magnet is provided in the magnet mounting portion.   A rubber seal is fixed to the outer peripheral portion of the metal core attached to the end portion of the inner raceway, and a seal lip is provided on the outer peripheral portion of the rubber seal to be elastically contacted with the inner circumference of the end portion of the outer raceway ring. A plurality of oil passage holes are formed at intervals in the circumferential direction, and a magnet mounting portion is provided between adjacent oil passage holes, and the plurality of oil passage holes are formed. The rolling bearing with a filter according to claim 1, wherein each hole is covered with the filter, and a permanent magnet is provided in the magnet mounting portion.   The seal member is provided with an inward flange at one end portion of a cylindrical portion that is fitted to an end portion of the outer raceway, and an inner diameter portion of the inward flange is provided between an end outer diameter surface of the inner raceway. The slinger is formed with a slinger having an inner cylindrical portion that forms a minute gap, and a plurality of oil passage holes are formed at intervals in the circumferential direction in the inward flange of the slinger, and a magnet is provided between adjacent oil passage holes. The rolling bearing with a filter according to claim 1, wherein an attachment portion is provided, each of the plurality of oil passage holes is covered with the filter, and a permanent magnet is provided on the magnet attachment portion.   The rolling bearing with a filter according to claim 4, wherein an annular permanent magnet is attached to an inner peripheral portion of an outer surface of the inward flange.   The rolling bearing with a filter according to claim 4, wherein an annular groove partially facing the minute gap is formed on an outer diameter surface of an end portion of the inner race, and an annular permanent magnet is attached in the annular groove.   The seal member is provided with an outward flange at one end of a cylindrical portion that is fitted to the end of the inner race, and the outer diameter of the outer flange is between the end inner diameter surfaces of the outer race. The slinger is formed with a slinger formed with an outer cylinder portion that forms a minute gap, and a plurality of oil passage holes are formed at intervals in the circumferential direction on the outward flange of the slinger, and a magnet is provided between adjacent oil passage holes. The rolling bearing with a filter according to claim 1, wherein an attachment portion is provided, each of the plurality of oil passage holes is covered with the filter, and a permanent magnet is provided on the magnet attachment portion.   The rolling bearing with a filter according to claim 7, wherein an annular permanent magnet is attached to an outer diameter surface of the outer cylinder portion.   The sealing member includes a cylindrical portion that is fitted to the end of the outer race, a small-diameter cylindrical surface that is connected to one end of the cylindrical portion, and is formed at the end of the inner race, and the small-diameter cylinder. A slinger having an inward flange that forms a labyrinth with an end face that faces radially outward from the end of the surface, and a plurality of oil passage holes are spaced in the circumferential direction on the inward flange. 2. The filter according to claim 1, wherein a magnet attachment portion is provided between adjacent oil passage holes, each of the plurality of oil passage holes is covered with the filter, and a permanent magnet is provided in the magnet attachment portion. Rolling bearing with.   The rolling bearing with a filter according to claim 9, wherein an annular groove is formed at a position axially outward from the labyrinth of the small diameter cylindrical surface, and an annular permanent magnet is attached to the annular groove.   The rolling bearing with a filter according to claim 9, wherein an annular permanent magnet having an inner diameter smaller than an inner diameter surface of the inward flange is attached to an inner peripheral portion of an inner surface of the inward flange. The filter according to any one of claims 1 to 11, wherein the magnet attachment portion is a through hole, and the permanent magnet is attached so as to cover the magnet attachment portion including the through hole from the inner surface of the seal member. Rolling bearing. The rolling bearing with a filter according to any one of claims 1 to 11, wherein the magnet attachment portion is a recess, and the permanent magnet is attached to a closed end portion of the recess.   The rolling bearing with a filter according to claim 1, wherein the permanent magnet is a rubber-like magnet.   The rolling bearing with a filter according to claim 14, wherein the rubber-like magnet is made of a mixture of nitrile rubber and a ferrite material.

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