JP2006010042A - Sealed type bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a lubricant filled up in a bearing unit from leaking to the outside of the bearing unit by making a large quantity of the lubricant surge into an elastic seal. <P>SOLUTION: The elastic seal 16 is arranged on a seal case 15 mounted in an unillustrated axle box via an outer ring 12. An opening 19 of the bearing unit is blocked by making the elastic seal 16 come in sliding contact with a rotary member 17 which is adjacent to an inner ring 11 and is mounted on an unillustrated rotary shaft, and a large quantity of the lubricant is limited to surge to the elastic seal 16 so that a slinger plate 21 extending outward in a radial direction of the bearing unit is arranged on an end of the inner ring 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealed bearing device that prevents foreign matter from entering the inside of the bearing and lubricant leakage from the inside of the bearing, and more particularly to prevention of lubricant leakage.

  FIG. 14 shows a conventional sealed bearing device used for supporting an axle of a railway vehicle or the like. 14 seals a pair of inner rings 11 and 11 fitted to an unillustrated axle, an outer ring 12 fitted and fixed to an unillustrated axle box, and rolling between the inner rings 11 and 11 and the outer ring 12. The main components are the double-row rolling elements 13, 13,... That intervene freely and the cages 14, 14 that hold the rolling elements 13, 13,. .

  By the way, since this type of sealed bearing device is used by filling a lubricant such as grease inside the bearing, it is necessary to prevent the occurrence of poor lubrication due to the entry of foreign matter into the bearing or leakage of the lubricant. For this reason, elastic seals 16 and 16 are provided in seal cases 15 and 15 attached to a shaft box (not shown) via the outer ring 12, and the elastic seals 16 and 16 are disposed on the inner rings 11 and 11, such as an oil drain or a rear cover. The bearing openings 19 and 19 are closed by sliding contact with sleeves 18 and 18 provided on the rotating members 17 and 17 (see, for example, Patent Document 1).

In addition, partition plates 20 and 20 extending inward in the bearing radial direction are provided on the inner peripheral portions of the seal cases 15 and 15 and on the bearing inner side of the elastic seals 16 and 16. By bringing the inner peripheral portion close to the sleeves 18, 18 of the rotating members 17, 17, a large amount of the lubricant inside the bearing is suppressed from being pushed toward the elastic seals 16, 16.
JP-A-9-68232

  However, in the above-described sealed bearing device, depending on the use conditions, a large amount of lubricant inside the bearing passes through the gap formed between the sleeves 18 and 18 and the partition plates 20 and 20 to the elastic seals 16 and 16. May be rushed to. When a large amount of lubricant is pushed toward the elastic seals 16 and 16, lubricant leakage occurs.

  The present invention was devised in view of such circumstances, and an object of the present invention is to prevent lubricant leakage by preventing a large amount of lubricant such as grease filled in the bearing from pushing against the elastic seal. Another object of the present invention is to provide a sealed bearing device that can maintain a good lubrication state.

  In order to achieve the above object, a sealed bearing device according to the present invention includes an inner ring fitted to a rotating shaft, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring, and a plurality of rolling elements. Rotation that includes a cage that holds the rolling elements at a predetermined interval in the circumferential direction of the bearing, provides an elastic seal in a seal case attached to the outer ring, and the elastic seal is attached to the rotating shaft adjacent to the inner ring and / or the inner ring. In a sealed bearing device in which a bearing opening is closed by sliding contact with a member, the outer peripheral portion of the inner ring and / or the outer peripheral portion of the rotating member is extended outward in the bearing radial direction to a portion on the inner side of the bearing relative to the elastic seal. It is characterized by the existence of a vibration plate.

  In the above-described sealed type bearing device, since the vibration cutting plate is provided in a portion on the inner side of the bearing with respect to the elastic seal of the inner ring and / or the rotating member, the lubricant inside the bearing passes through the inner ring and the rotating member to the elastic seal side. Adheres to the swing plate when heading toward. Since the swing plate is provided on the inner ring and / or the rotating member, it rotates along with the rotating shaft. When the lubricant heading from the inside of the bearing toward the elastic seal adheres to the vibration plate, it flows toward the outer periphery of the vibration plate due to the centrifugal force that acts when the vibration plate rotates, and from the outer periphery of the vibration plate to the seal case. It is skipped to the inner periphery. The seal case is a member that is attached to a non-rotating shaft box and is stationary. Most of the lubricant adhering to the inner periphery of the seal case flows down the inner periphery of the seal case and collects at the bottom of the seal case. Since the elastic seal extends upward at the bottom of the seal case and is in sliding contact with the rotating member, the lubricant collected on the bottom of the seal case is slid from the bottom of the seal case to the sliding contact portion between the elastic seal and the rotating member. It is difficult to move to the inside of the bearing from the bottom of the seal case. The reason why the lubricant is returned from the bottom of the seal case to the inside of the bearing is that the seal case is usually formed in a multistage cylindrical shape having a small diameter from one end side to the other end side attached to the axle box. Is. On the other hand, there is a lubricant that flows in the upper part of the inner periphery of the seal case to the opposite side of the bearing, passes through the gap between the vibration plate and the seal case, and reaches the elastic seal. Only a small amount of the entire lubricant going from to the elastic seal. Therefore, according to the said structure of this invention, it can suppress that lubricants, such as grease with which it filled the inside of a bearing, pushes in large quantities toward the elastic seal side.

  Further, in order to achieve the above object, the sealed bearing device according to the present invention has a partition plate extending inward in the bearing radial direction at a portion on the inner side of the seal case and on the inner side of the bearing relative to the elastic seal. Provided, the inner periphery of the partition plate is brought close to the outer periphery of the inner ring and / or the outer periphery of the rotating member, and extends along the outer periphery of the inner ring and / or the outer periphery of the rotating member to the inner periphery of the partition plate. The inner ring portion is formed, and a labyrinth seal is configured between the inner ring portion of the partition plate and the inner ring and / or the rotating member.

  In the above-described sealed bearing device, a labyrinth seal is formed between the inner ring portion of the partition plate and the inner ring and / or the rotating member, so that the lubricant inside the bearing causes the inner ring portion of the partition plate and the inner ring and / or Or the pressure required to enter the gap between the rotating member and the pressure required for the lubricant inside the bearing to pass through the gap between the inner ring portion of the partition plate and the inner ring and / or the rotating member. Enhanced. As a result, even if a large amount of lubricant flows from the inside of the bearing toward the elastic seal, most of the lubricant enters the gap between the inner ring portion of the partition plate and the inner ring and / or the rotating member. Cannot be returned to the inside of the bearing. Therefore, according to the above-described sealed bearing device, the amount of the lubricant that reaches the elastic seal through the gap between the partition plate and the inner ring and / or the rotating member from the inside of the bearing can be suppressed to a very small amount.

  Further, in order to achieve the above object, the sealed bearing device according to the present invention has a partition plate extending inward in the bearing radial direction at a portion on the inner side of the seal case and on the inner side of the bearing relative to the elastic seal. Provided, the inner peripheral portion of the partition plate is brought close to the outer peripheral portion of the inner ring and / or the outer peripheral portion of the rotating member, and at least the inner peripheral portion of the surface on the side of the anti-elastic seal of the partition plate is inclined toward the bearing inner side. It is characterized by that.

  The above-described sealed bearing device extends the partition plate from the inner peripheral portion of the seal case to the outer peripheral portion of the inner ring and / or the vicinity of the outer peripheral portion of the rotating member, and at least an inner surface of the anti-elastic seal side of the partition plate. Since the peripheral part is inclined toward the bearing inner side, when a large amount of lubricant rushes from the bearing inside, most of the lubricant will move along the anti-elastic seal side surface of the partition plate. It escapes to the outer peripheral side and cannot enter the gap between the partition plate and the inner ring and / or the rotating member. Therefore, according to the above-described sealed bearing device, the amount of the lubricant that reaches the elastic seal through the gap between the partition plate and the inner ring and / or the rotating member from the inside of the bearing can be suppressed to a very small amount.

  According to the sealed bearing device of the present invention, the lubricant in the bearing is prevented from being pushed in a large amount toward the elastic seal side, thereby preventing lubricant leakage and maintaining the lubrication state of the bearing in a good state. be able to.

  Hereinafter, first to sixth embodiments of a sealed bearing device according to the present invention will be described with reference to the accompanying drawings. In the first to sixth embodiments, the same portions as those in the conventional example are denoted by the same reference numerals.

  FIG. 1 is a longitudinal sectional view illustrating a first embodiment of a hermetic bearing device according to the present invention, and shows a case where the present invention is applied to an axle support of a railway vehicle or the like, as in the conventional example. . In the sealed bearing device according to the first embodiment, a plurality of rolling elements 13, 13,... Are movably interposed between the pair of inner rings 11, 11 and the outer ring 12, and the rolling elements 13, Are held at predetermined intervals in the circumferential direction of the bearing by the cages 14 and 14. One end of seal cases 15 and 15 is fitted and fixed to both ends of the outer ring 12, and the seal cases 15 and 15 are attached and fixed to a shaft box (not shown) via the outer ring 12. The seal cases 15 and 15 are members formed in a multistage cylindrical shape having a small diameter from one end side to the other end side. Elastic seals 16 and 16 and partition plates 20 and 20 are provided in order from the other end side on the inner periphery of the seal cases 15 and 15. Further, a vibration plate 21 is attached to an end portion of the inner ring 11 which is a portion on the bearing inner side from the elastic seal 16.

  FIG. 2 is an enlarged view of a main part of FIG. Hereinafter, the elastic seal 16, the partition plate 20, and the swing plate 21 will be described in detail with reference to FIG. 2.

As shown in FIG. 2, the elastic seal 16 includes a cored bar 16a fitted into the seal case 15, and a lip member 16b made of an elastic material such as rubber or synthetic resin fixed to the cored bar 16a. The lip member 16b includes first lips 16b1 and 16b1 that are slidably contacted with a sleeve 18 provided on a rotating member 17 that is attached to an axle (not shown) adjacent to the inner ring 11, and a second lip 16b2 that is adjacent to the sleeve 18. Have The sleeve 18 is externally fitted to the rotating member 17 and has a fitting portion 18a for slidingly contacting the first lips 16b1 and 16b1 of the lip member 16b, and a bearing radial direction from the end of the fitting portion 18a opposite to the bearing. A labyrinth seal between the outer peripheral surface of the annular flange portion 18b and the inner peripheral surface of the other end of the seal case 15 having an annular flange portion 18b that extends outward and approaches the second lip 16b2 of the lip member 16b. S ₁ is formed.

  As shown in FIG. 2, the partition plate 20 includes a fitting portion 20 a that is fitted into the seal case 15 via a core 16 a of the elastic seal 16, and a sliding contact portion between the lip member 16 b of the elastic seal 16 and the sleeve 18. Further, a disc portion 20b extending from the fitting portion 20a to the inside in the bearing radial direction is provided on the bearing inner side, and the inner peripheral portion of the disc portion 20b is brought close to the fitting portion 18a of the sleeve 18.

  As shown in FIG. 2, the swing plate 21 is a member that is attached to an unillustrated axle via the inner ring 11 and rotates along with the unillustrated axle, and extends from the inner ring 11 outward in the bearing radial direction. It is formed to exist. The swing plate 21 in this embodiment includes a fitting portion 21a that is fitted on the fitting portion 11a of the inner ring 11, and a disc portion 21b that extends outward from the inner end of the fitting portion 21a in the bearing radial direction. It has an L-shaped cross section and is formed in an annular shape. In addition, the fitting part 11a of the inner ring 11 is a part to which a rotary member 17 such as an oil drainer or a rear lid is externally fitted via the vibration cutting plate 21.

  As shown in FIG. 1, the sealed bearing device of the first embodiment is provided with a swing plate 21 that extends outward in the bearing radial direction at the end of the inner ring 11 that is a portion on the bearing inner side of the elastic seal 16. Therefore, when the lubricant inside the bearing travels along the inner ring 11 toward the elastic seal 16, it adheres to the vibration plate 21. The lubricant adhering to the vibration plate 21 flows toward the outer periphery of the vibration plate 21 due to the centrifugal force that acts when the vibration plate 21 rotates, and the inner periphery of the seal case 15 from the outer periphery of the vibration plate 21. To be skipped. Most of the lubricant adhering to the inner peripheral portion of the seal case 15 flows down the inner peripheral portion of the seal case 15 and collects at the bottom portion 15a of the seal case 15. Since the partition plate 20 extends upward at the bottom portion 15 a of the seal case 15, the lubricant collected on the bottom portion 15 a of the seal case 15 passes through the partition plate 20 from the bottom portion 15 a of the seal case 15 and the elastic seal 16. It is not possible to go to the sliding contact portion between the sleeve 18 and the sleeve 18, and the seal case 15 is returned from the bottom 15 a to the inside of the bearing. Therefore, according to the sealed bearing device of the first embodiment, it is possible to suppress a large amount of lubricant such as grease filled in the bearing from being pushed toward the elastic seal 16.

  In the first embodiment, the swing plate 21 is externally fitted and fixed to the fitting portion 11 a of the inner ring 11, but the swing plate 21 is fixed to the fitting portion 17 a of the rotating member 17. I do not care. In the first embodiment, the swing plate 21 is externally fixed to the fitting portion 11a of the inner ring 11. However, as shown in FIG. Or may be fitted to the outer peripheral portion of the rotating member 17 as shown in FIG. Furthermore, in the first embodiment, only one swing plate 21 is provided, but a plurality of swing plates 21 can also be provided. In this case, the plurality of swing plates 21 may be provided only on the inner ring 11, may be provided only on the rotating member 17, or may be provided on both the inner ring 11 and the rotating member 17.

Next, a second embodiment of the sealed bearing device according to the present invention will be described with reference to FIG. As shown in FIG. 4, the sealed bearing device of the second embodiment is a partition plate extending inwardly in the bearing radial direction at a portion on the inner side of the seal case 15 and on the inner side of the bearing relative to the elastic seal 16. 20 is different from the sealed bearing device of the first embodiment in that the labyrinth seal S ₂ is configured between the partition plate 20 and the swing plate 21. Since the other points are the same as those of the sealed bearing device of the first embodiment, the following description will focus on differences from the sealed bearing device of the first embodiment.

As shown in FIG. 4, the vibration plate 21 in the second embodiment is fitted to the fitting portion 11 a of the inner ring 11, and extends outward in the bearing radial direction from the back end portion of the fitting portion 21 a. And a disc portion 21b formed substantially the same diameter as the inner diameter of the partition plate 20, and extending from the outer periphery of the disc portion 21b toward the partition plate 20 in the bearing axial direction. An outer ring portion 21c having an L-shaped cross-section that is folded outward along the bearing radial direction along the surface of the anti-elastic seal, and between the outer ring portion 21c of the swing plate 21 and the partition plate 20, to form a labyrinth seal S ₂ extending bearing radially.

In the sealed bearing device of the second embodiment, the labyrinth seal S ₂ is configured between the partition plate 20 and the vibration plate 21 as described above, so that the lubricant inside the bearing is separated from the partition plate 20 and the vibration plate. It is difficult to enter a minute gap between the cut plate 21 and a large amount of lubricant does not press against the elastic seal 16 beyond the partition plate 20 and the vibration cut plate 21.

In the second embodiment, between the plate 21 image blur partition plate 20, but is formed a labyrinth seal S ₂ extending bearing radially circle shown in FIG. 5 (A) of as image blur plate 21 The plate portion 21b is formed to have a diameter slightly larger than the inner diameter of the partition plate 20, and a cylindrical outer ring portion 21c extending from the outer peripheral portion of the disk portion 21b to the partition plate 20 side is formed. A cylindrical inner ring portion 20c extending from the inner peripheral portion of the plate portion 20b to the vibration plate 21 side is formed, and the inner peripheral surface of the outer ring portion 21c of the vibration plate 21 and the outer periphery of the inner ring portion 20c of the partition plate 20 between the surface, it is also possible to form a labyrinth seal S ₂ extending bearing axis direction. Further, as shown in FIG. 5B, the outer ring portion 21c of the swing plate 21 has an L-shaped cross section so as to be close to the disk portion 20b and the inner ring portion 20c of the partition plate 20 from the outer peripheral portion of the disk portion 21b. while forming, by forming a cylindrical inner ring portion 20c in the inner peripheral portion of the disc portion 20b of the partition plate 20, it is also possible to form a labyrinth seal S ₂ extending bearing radially and the bearing axis direction.

Next, a third embodiment of the sealed bearing device according to the present invention will be described with reference to FIG. As shown in FIG. 6, the sealed bearing device of the third embodiment extends the swing plate 21 to the vicinity of the inner peripheral portion of the seal case 15, and the inner periphery of the seal case 15 on the outer peripheral portion of the swing plate 21. the outer ring portion 21c extending formed along the circumference, in that to constitute a labyrinth seal S ₃ between the outer ring portion 21c and the seal case 15 of the image blur plate 21, the first and second embodiments This is different from the sealed type bearing device. Since the other points are the same as the sealed bearing devices of the first and second embodiments, the following description will focus on differences from the sealed bearing devices of the first and second embodiments.

As shown in FIG. 6, the vibration plate 21 according to the third embodiment seals the fitting portion 21 a to be fitted onto the fitting portion 11 a of the inner ring 11 and the outer end portion of the fitting portion 21 a outward in the bearing radial direction. A disc portion 21b extending to the vicinity of the inner peripheral portion of the case 15 and an outer ring portion 21c extending from the outer peripheral portion of the disc portion 21b to the partition plate 20 side along the inner peripheral portion of the seal case 15 are provided. A labyrinth seal S ₃ extending in the bearing axial direction is formed between the outer peripheral portion of the outer ring portion 21 c of the vibration plate 21 and the inner peripheral portion of the seal case 15.

Sealed bearing device of the third embodiment, as described above, the image blur so is formed a labyrinth seal S ₃ between the plate 21 and the seal case 15, a plate 21 lubricant in the bearing is image blur It is difficult to enter the minute gaps between the seal cases 15, so that a large amount of lubricant does not press against the elastic seal 16 beyond the vibration plate 21.

In the third embodiment, the outer ring portion 21 c of the swing plate 21 is formed in a cylindrical shape and the labyrinth seal S ₃ is formed only between the seal case 15. It is also possible to combine with a labyrinth seal S ₂ formed between the portion 21 c and the partition plate 20. For example, as shown in FIG. 7A, the outer ring portion 21 c of the swing plate 21 extends from the outer peripheral portion of the disc portion 21 b toward the partition plate 20 along the inner peripheral portion of the seal case 15, and the partition plate 20. The inner ring portion 21c of the swing plate 21 and the inner peripheral portion of the seal case 15 and the partition plate 20 are formed by folding back inward in the bearing radial direction along the surface of the anti-elastic seal and forming an L-shaped cross section. Labyrinth seals S ₂ and S ₃ can also be formed between the disk portion 20b. Further, as shown in FIG. 7B, the disc portion 21b of the swing plate 21 is formed to have substantially the same diameter as the inner peripheral portion of the partition plate 20, and the disc of the partition plate 20 extends from the outer peripheral portion of the disc portion 21b. The outer ring portion 21c of the swing plate 21 and the seal case 15 can also be formed by forming the outer ring portion 21c of the swing plate 21 in a U-shaped cross section so as to be close to the inner peripheral portion of the portion 20b and the seal case 15. The labyrinth seals S ₂ and S ₃ can be formed between the inner peripheral portion and the disc portion 20 b of the partition plate 20. Further, as shown in FIG. 7C, the outer ring portion 21c of the swing plate 21 is formed in a U-shaped cross section, and the inner ring portion 20c is provided on the inner peripheral portion of the partition plate 20, thereby A labyrinth seal S ₂ extending in the bearing axial direction and the bearing radial direction is formed between the outer ring portion 21 c and the partition plate 20, while a bearing is provided between the outer ring portion 21 c of the vibration plate 21 and the seal case 15. it is possible to form a labyrinth seal S ₃ extending in the axial direction.

  Next, a fourth embodiment of the sealed bearing device according to the present invention will be described with reference to FIG. As shown in FIG. 8, the sealed bearing device of the fourth embodiment is the first to the second in that at least the outer peripheral portion of the anti-elastic seal side surface of the vibration plate 21 is inclined toward the bearing inner side. This is different from the sealed bearing device of the third embodiment. Since the other points are the same as those of the sealed bearing device of the first to third embodiments, the following description will focus on differences from the sealed bearing device of the first to third embodiments.

  As shown in FIG. 8, the vibration plate 21 in the fourth embodiment extends to the outside in the bearing radial direction from a fitting portion 21 a that is fitted on the fitting portion 11 a of the inner ring 11 and a rear end portion of the fitting portion 21 a. The outer peripheral portion of the anti-elastic seal side of the vibration plate 21 is inclined toward the bearing inner side by bending the outer peripheral portion of the disc portion 21b toward the bearing inner side. It is.

  In the sealed bearing device of the fourth embodiment, as described above, at least the outer peripheral portion of the anti-elastic seal side surface of the vibration plate 21 is inclined toward the bearing inner side. When the lubricant directed toward the surface adheres to the vibration plate 21, the lubricant flows to the outer peripheral portion of the vibration plate 21 due to the centrifugal force acting when the vibration plate 21 rotates, and the inclination of the lubricant from the outer peripheral portion of the vibration plate 21. It is blown toward the direction and returned to the inside of the bearing. Therefore, according to the sealed bearing device of the fourth embodiment, it is possible to prevent a large amount of lubricant from being pushed toward the elastic seal 16 beyond the vibration plate 21.

  In the fourth embodiment, the outer peripheral portion of the swing plate 21 is inclined from a position away from the partition plate 20, but the outer ring portion 21c of the swing plate 21 is a disc portion as shown in FIG. The outer peripheral portion of the swing plate 21 is extended from the outer peripheral portion of 21b toward the partition plate 20 and extended outward from the position adjacent to the partition plate 20 with a predetermined inclination angle with respect to the bearing radial direction. It is also possible to incline from a position close to. Further, in the fourth embodiment, the outer peripheral portion of the swing plate 21 is formed in a conical shape and is inclined, but the outer peripheral portion of the swing plate 21 has a concave curved surface on the bearing inner side as shown in FIG. It may be curved and inclined in a shape (for example, spherical shape, elliptical spherical shape, parabolic shape, etc.). Furthermore, in the fourth embodiment, only the outer peripheral portion of the disc portion 21b of the swing plate 21 is inclined toward the bearing inner side, but the entire disc portion 21b of the swing plate 21 faces the bearing inner side. May be inclined. Furthermore, in the fourth embodiment, both surfaces of the disc portion 21b of the swing plate 21 are inclined. However, if the antielastic seal side surface of the disc portion 21b is inclined, the disc portion 21b The surface on the elastic seal side may not be inclined.

Next, a fifth embodiment of the sealed bearing device according to the present invention will be described with reference to FIG. As shown in FIG. 10, the sealed bearing device of the fifth embodiment is a partition plate that extends inward in the bearing radial direction at a portion on the inner peripheral side of the seal case 15 and on the inner side of the bearing relative to the elastic seal 16. 20, the inner peripheral portion of the partition plate 20 is brought close to the outer peripheral portion of the rotating member 17, and an inner ring portion 20 c extending in the bearing axial direction is formed on the inner peripheral portion of the partition plate 20. The labyrinth seal S ₄ is configured between the inner ring portion 20 c and the rotating member 17, which is different from the sealed bearing device of FIG. 14 showing the conventional example. Since the other points are the same as those of the sealed bearing device of FIG. 14 showing the conventional example, the difference will be mainly described below.

As shown in FIG. 10, the partition plate 20 according to the fifth embodiment is circular from the fitting portion 20 a fitted into the inner peripheral portion of the seal case 15 to the vicinity of the fitting portion 18 a of the sleeve 18 provided on the rotating member 17. The plate portion 20b is extended, the inner ring portion 20c is extended from the inner peripheral portion of the disc portion 20b to the bearing inner side, and the space between the inner ring portion 20c of the partition plate 20 and the fitting portion 18a of the sleeve 18 is increased. to form a labyrinth seal S ₄ which extends in the bearing axial direction.

In the sealed bearing device of the fifth embodiment, as described above, the labyrinth seal S ₄ is formed between the partition plate 20 and the sleeve 18, so that the lubricant inside the bearing is retained by the inner ring of the partition plate 20. It is difficult to penetrate between the portion 20 c and the sleeve 18, so that a large amount of lubricant does not press against the elastic seal 16 beyond the partition plate 20.

In the fifth embodiment, the inner ring portion 20c of the partition plate 20 extends to the bearing inner side. However, the inner ring portion 20c of the partition plate 20 extends to the elastic seal side as shown in FIG. You can leave it there. Further, in the fifth embodiment, the sleeve 18 is provided on the rotating member 17, but when the sleeve 18 is not provided, as shown in FIGS. 11B and 11C, the rotating member 17 rotates with the inner ring portion 20c of the partition plate 20. A labyrinth seal S ₄ is formed between the outer periphery of the member 17. Furthermore, in 5th Embodiment, although the fitting part 20a of the partition plate 20 is internally fitted in the seal case 15 via the metal core 16a of the elastic seal 16, as shown in FIGS. The fitting portion 20 a of the plate 20 may be interposed between the seal case 15 and the core metal 16 a of the elastic seal 16. Furthermore, in the fifth embodiment, the inner ring portion 20c of the partition plate 20 is extended along the sleeve 18 provided on the rotating member 17, but the inner ring portion 20c of the partition plate 20 is shown in FIG. ) As shown in FIG. 11E, or along the outer periphery of the inner ring 11 and the outer periphery of the rotating member 17 as shown in FIG.

  Next, a sixth embodiment of the sealed bearing device according to the present invention will be described with reference to FIG. As shown in FIG. 12, the sealed bearing device of the sixth embodiment has a bearing radius from the inner peripheral portion of the seal case 15 to the inner peripheral portion of the seal case 15 and closer to the bearing inner side than the elastic seal 16. A partition plate 20 extending inward in the direction is provided, the inner peripheral portion of the partition plate 20 is extended to the vicinity of the outer peripheral portion of the rotating member 17, and at least the inner peripheral portion of the surface on the antielastic seal side of the partition plate 20 is provided. It is different from the sealed bearing device of the first to fifth embodiments in that it is inclined toward the bearing inner side. Since the other points are the same as the sealed bearing devices of the first to fifth embodiments, the following description will focus on differences from the sealed bearing devices of the first to fourth embodiments.

  As shown in FIG. 12, the partition plate 20 in the sixth embodiment includes a fitting portion 20 a that is fitted into the seal case 15 via a cored bar 16 a of the elastic seal 16, and a rotating member from the end of the fitting portion 20 a. 17 has a disk portion 20b that extends to the vicinity of the fitting portion 18a of the sleeve 18 provided at 17 and is inclined toward the bearing inner side.

  In the sealed bearing device of the sixth embodiment, as described above, the partition plate 20 is inclined toward the inside of the bearing. Therefore, when a large amount of lubricant is pushed from the inside of the bearing, a large amount of the lubricant is generated. The portion escapes along the circular plate portion 20 b of the partition plate 20 to the outer peripheral portion of the partition plate 20 and cannot enter the gap between the partition plate 20 and the sleeve 18. Therefore, according to the sealed bearing device of the sixth embodiment, the amount of lubricant that reaches the elastic seal 16 through the gap between the partition plate 20 and the sleeve 18 from the inside of the bearing can be suppressed to a very small amount.

  In the sixth embodiment, the sleeve 18 is provided on the rotating member 17. However, if the sleeve 18 is not provided, the disk portion 20b of the partition plate 20 is fitted to the fitting portion 20a as shown in FIG. To the vicinity of the outer periphery of the rotating member 17. In the sixth embodiment, the disc portion 20b of the partition plate 20 is extended to the vicinity of the sleeve 18 provided on the rotating member 17, but the disc portion 20b of the partition plate 20 is shown in FIG. As shown in FIG. 13, it can be extended to the vicinity of the outer peripheral portion of the inner ring 11, or can be extended to the vicinity of the outer peripheral portion of the inner ring 11 and the outer peripheral portion of the rotating member 17 as shown in FIG. Furthermore, in the sixth embodiment, the disk portion 20b of the partition plate 20 is inclined toward the bearing inner side. However, the disk portion 20b of the partition plate 20 is formed on the bearing inner side as shown in FIG. You may make it curve toward.

  The first to sixth embodiments of the sealed bearing device of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, each of the above-described embodiments Then, the cored bar 16 a and the partition plate 20 of the elastic seal 16 are formed separately from the seal case 15, but the cored bar 16 a and / or the partition plate 20 of the elastic seal 16 are molded integrally with the seal case 15. It doesn't matter. In the first to fourth embodiments, the swing plate 21 is formed separately from the inner ring 11 and the rotary member 17. However, the swing plate 21 is integrated with the inner ring 11 or the rotary member 17. You may shape | mold. Further, in each of the above-described embodiments, the elastic seal 16 is slidably contacted with the rotating member 17 or the sleeve 18 attached to the rotating member 17, but the end of the inner ring 11 is extended outward in the axial direction. The elastic seal 16 can also be brought into sliding contact with the outer peripheral portion of the inner ring 11.

1 is a cross-sectional view showing a first embodiment of a sealed bearing device according to the present invention. It is a principal part enlarged view of FIG. (A) A figure and (B) figure are principal part expanded sectional views which show the modification of 1st Embodiment. It is a principal part expanded sectional view which shows 2nd Embodiment of the sealed bearing apparatus which concerns on this invention. FIGS. 5A and 5B are enlarged cross-sectional views of main parts showing a modification of the second embodiment. It is a principal part expanded sectional view which shows 3rd Embodiment of the sealed bearing apparatus which concerns on this invention. (A) The figure thru | or (C) figure are the principal part expanded sectional views which show the modification of 3rd Embodiment. It is a principal part expanded sectional view which shows 4th Embodiment of the sealed bearing apparatus which concerns on this invention. FIGS. 5A and 5B are enlarged cross-sectional views of main parts showing a modification of the fourth embodiment. It is a principal part expanded sectional view which shows 5th Embodiment of the sealed bearing apparatus which concerns on this invention. (A) The figure thru | or (C) figure are the principal part expanded sectional views which show the modification of 5th Embodiment. It is a principal part expanded sectional view which shows 6th Embodiment of the sealed bearing apparatus which concerns on this invention. It is a principal part expanded sectional view which shows the modification of 6th Embodiment. It is sectional drawing which shows an example of the conventional sealed bearing apparatus.

Explanation of symbols

11 inner ring 12 outer ring 13 rolling element 14 holder 15 sealing the case 16 elastic seal 17 rotates member 18 sleeve 19 bearing the opening 20 the partition plate 21 image blur plate S ₁ to S ₄ labyrinth seals

Claims (6)

An inner ring fitted to the rotary shaft, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring so as to be freely rollable, and a cage for holding the plurality of rolling elements at predetermined intervals in the bearing circumferential direction. A sealing type bearing device comprising an elastic seal provided in a seal case attached to an outer ring, wherein the elastic seal is slidably contacted with a rotating member attached to a rotating shaft adjacent to the inner ring and / or the inner ring to close the bearing opening. ,
A sealed bearing device, characterized in that a vibration plate extending outward in the radial direction of the bearing is provided in a portion on the outer peripheral portion of the inner ring and / or the outer peripheral portion of the rotating member and inside the bearing relative to the elastic seal.   A partition plate extending inward in the radial direction of the bearing is provided at the inner peripheral portion of the seal case and on the inner side of the bearing relative to the elastic seal, and a labyrinth seal is configured between the partition plate and the swing plate. The sealed bearing device according to claim 1, wherein   The swing plate is extended to the vicinity of the inner peripheral portion of the seal case, and an outer ring portion extending along the inner peripheral portion of the seal case is formed on the outer peripheral portion of the swing case. The sealed bearing device according to claim 1, wherein a labyrinth seal is formed between the seal case and the seal case.   The sealed bearing device according to any one of claims 1 to 3, wherein at least an outer peripheral portion of the anti-elastic seal side surface of the vibration plate is inclined toward the bearing inner side. An inner ring fitted to the rotary shaft, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring so as to be freely rollable, and a cage for holding the plurality of rolling elements at predetermined intervals in the bearing circumferential direction. A sealing type bearing device comprising an elastic seal provided in a seal case attached to an outer ring, wherein the elastic seal is slidably contacted with a rotating member attached to a rotating shaft adjacent to the inner ring and / or the inner ring to close the bearing opening. ,
A partition plate extending inward in the radial direction of the bearing is provided at the inner peripheral portion of the seal case and on the inner side of the bearing relative to the elastic seal, and the inner peripheral portion of the partition plate is the outer peripheral portion of the inner ring and / or the rotating member. An inner ring portion extending along the outer peripheral portion of the inner ring and / or the outer peripheral portion of the rotating member is formed on the inner peripheral portion of the partition plate along with the outer peripheral portion, and the inner ring portion and the inner ring of the partition plate and / or A sealed bearing device comprising a labyrinth seal with a rotating member. An inner ring fitted to the rotary shaft, an outer ring, a plurality of rolling elements interposed between the inner ring and the outer ring so as to be freely rollable, and a cage for holding the plurality of rolling elements at predetermined intervals in the bearing circumferential direction. A sealing type bearing device comprising an elastic seal provided in a seal case attached to an outer ring, wherein the elastic seal is slidably contacted with a rotating member attached to a rotating shaft adjacent to the inner ring and / or the inner ring to close the bearing opening. ,
A partition plate extending inward in the radial direction of the bearing is provided at the inner peripheral portion of the seal case and on the inner side of the bearing relative to the elastic seal. A sealed bearing device characterized in that the seal plate is brought close to the outer peripheral portion and at least the inner peripheral portion of the surface of the partition plate on the side of the antielastic seal is inclined toward the inner side of the bearing.

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