JP2007064459A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device capable of providing excellent sealability in severe dusty environments. <P>SOLUTION: This sealing device comprises a stationary side mounting ring 11 sealingly secured to a stationary side member 1, a rotating side mounting ring 12 sealingly secured to a rotating side member 2, a stationary side seal lip 13 formed integrally with the stationary side mounting ring 11 and having an end part slidably brought into close contact with the rotating side mounting ring 12, and rotating side seal lips 14, 15 formed integrally with the rotating side mounting ring 12, having an end part slidably brought into close contact with the stationary side mounting ring 11, and positioned on the outside of the stationary side seal lip 13. A rotary vane 17 positioned on the outside of the rotating side seal lips 14, 15 is formed at the base parts 16 of the rotating side seal lips 14, 15. When the rotary vane 17 is rotated together with the rotating side seal lips 14, 15, an external dust is blown off by a centrifugal force and a labyrinth seal action is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bearing device that rotatably supports a wheel on, for example, an automobile wheel suspension device, and a sealing device that is used as a sealing means for an underbody of an agricultural machine, a construction machine, or the like.

  FIG. 9 is a cross-sectional view showing a conventional sealing device 100 that seals a bearing portion of an automobile wheel suspension device. This sealing device 100 is also referred to as a hub seal, and is incorporated between the end portions of the outer ring 111 and the inner ring 112 of the bearing to prevent entry of muddy water or the like from the outer space A into the bearing inner B.

Specifically, the sealing device 100 includes a metal stationary side mounting ring 101 press-fitted to the inner peripheral surface of the end portion of the outer ring 111 of the bearing and a metal fitting press-fitted to the outer peripheral surface of the end portion of the inner ring 112 of the bearing. The rotation side mounting ring 102 and the stationary side mounting ring 101 are integrally provided at the inner peripheral end of the inward flange 101b of the stationary side mounting ring 101, and the tip portion can slide on the outer peripheral surface of the inner peripheral cylindrical portion 102a of the rotation side mounting ring 102. The inner peripheral lip 103 made of a rubber-like elastic material and the outer peripheral portion of the outward flange 102b in the rotation side mounting ring 102 are provided integrally with the outer peripheral cylindrical portion 101a in the stationary side mounting ring 101. A rotation-side outer peripheral lip 104 and a side lip 105 made of a rubber-like elastic material that are slidably brought into close contact with the inner peripheral surface and the inner surface of the inward flange 101b are provided (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-252762

  That is, the sealing device 100 is formed with a three-stage sealing sliding portion by the outer peripheral lip 104, the side lip 105, and the stationary inner lip 103 on the rotating side, and the outer peripheral lip 104 and the side lip 105 on the rotating side. Since there is a swinging action by centrifugal force, excellent sealing performance can be exhibited.

  However, since this type of sealing device 100 is exposed to a harsh dust environment in which dirt, muddy water, and the like constantly fly during traveling of the vehicle, it has been difficult to sufficiently seal external dust. In order to improve the sealing performance against external dust, in addition to the outer peripheral lip 104, the side lip 105, and the stationary inner peripheral lip 103, the number of seal lips may be further increased. It was necessary to increase the size, which was not possible with the conventional installation space. In addition, since the seal lip slides with the stationary attachment ring 101 or the rotation attachment ring 102, increasing the number thereof causes a problem that the amount of heat generated by the sliding increases and the material deteriorates.

  The present invention has been made in view of the above points, and a technical problem thereof is to provide a sealing device that can exhibit excellent sealing performance in a harsh dust environment. .

  As means for effectively solving the technical problem described above, the sealing device according to the invention of claim 1 is closely fitted and fixed to the stationary member and the rotating member. A rotation-side mounting ring, a stationary-side seal lip that is provided integrally with the stationary-side mounting ring and whose tip is slidably in contact with the rotation-side mounting ring, and is provided integrally with the rotation-side mounting ring. A rotation side seal lip positioned outside the stationary side seal lip, and a rotation side seal lip at the base of the rotation side seal lip. A plurality of rotating blades arranged on the outer side and arranged in the circumferential direction are formed.

  According to this configuration, the dust environment is the severest outside the rotating side seal lip, but the rotating blades formed in this part rotate integrally with the rotating side seal lip, so that the external dust is subjected to centrifugal force. Therefore, the labyrinth effect is exerted, so that the entry of external dust into the rotating side seal lip can be suppressed.

  According to the sealing device of the first aspect of the invention, the rotating blades formed on the outer side of the rotating side seal lip suppress the intrusion of external dust into the rotating side seal lip. It is possible to improve the sealing performance over a long period of time.

  Hereinafter, preferred embodiments of a sealing device according to the present invention will be described with reference to the drawings. First, FIG. 1 is a sectional view showing a first embodiment, and FIG. 2 is a partial sectional perspective view of the same.

  A sealing device 10 shown in FIGS. 1 and 2 is a suspension device for an automobile, and a stationary side mounting ring 11 that is press-fitted to an inner peripheral surface of an outer ring 1 of a bearing that rotatably supports a wheel, A rotating side mounting ring 12 that is tightly fitted and fixed to the outer peripheral surface of the inner ring 2, an inner peripheral lip 13 that is provided integrally with the stationary side mounting ring 11, and a side lip that is provided integrally with the rotating side mounting ring 12. 14 and an outer peripheral lip 15. Here, the outer ring 1 is non-rotating and corresponds to the stationary side member described in claim 1, and the inner ring 2 rotates together with a shaft (not shown), and the rotating side described in claim 1. The inner peripheral lip 13 corresponds to a stationary side seal lip described in claim 1, and the side lip 14 and the outer peripheral lip 15 correspond to a rotation side seal lip described in claim 1.

  Specifically, the stationary side mounting ring 11 is manufactured by punching and pressing a metal plate such as a steel plate, and the shape (cross-sectional shape shown in the figure) cut along a plane passing through the axis is substantially L-shaped. The outer peripheral cylindrical portion 11a is press-fitted to the inner peripheral surface of the outer ring 1, and the inner peripheral flange portion 11b extends from the end on the bearing inner B side to the inner peripheral side.

  Similarly, the rotating side mounting ring 12 is manufactured by punching and pressing a metal plate such as a steel plate, and the shape (cross-sectional shape shown in the figure) cut along a plane passing through the axis is substantially L-shaped. It comprises an inner peripheral cylindrical portion 12a that is press-fitted to the outer peripheral surface of the inner ring 2, and an outer peripheral flange portion 12b that extends from the end portion on the outer space A side to the outer peripheral side.

  The inner peripheral lip 13 is positioned and set in a mold (not shown) to which a stationary side mounting ring 11 previously coated with a vulcanizing adhesive is clamped, and is clamped between the mold and the stationary side mounting ring 11. The formed molding cavity is filled with an unvulcanized rubber material, heated and pressurized to be integrally formed with the stationary side mounting ring 11, and the base portion 13 a is formed in the stationary side mounting ring 11. It is vulcanized and bonded to the inner diameter portion of the peripheral flange portion 11b, extends from there to a taper shape toward the inner peripheral side and faces the opposite side to the bearing interior B, and the inner peripheral end portion 13b is an inner portion of the rotation side mounting ring 12. It is slidably in close contact with the outer peripheral surface of the peripheral cylinder portion 12a.

  The side lip 14 and the outer lip 15 are positioned and set in a mold (not shown) with a vulcanized adhesive applied in advance, and the mold is clamped. An unvulcanized rubber material is filled in a molding cavity defined between them, and is integrally molded with the rotating side mounting ring 12 by heating and pressurizing. The common base 16 rotates. The side mounting ring 12 is vulcanized and bonded to the outer diameter portion of the outer peripheral flange 12b.

  Of these, the side lip 14 is located on the outer peripheral side of the inner peripheral lip 13 and is formed into a conical cylinder shape having a large diameter at the tip end side from the inner peripheral portion of the base portion 16 facing away from the external space A. The distal end portion 14a is slidably in close contact with the inner surface of the inner peripheral flange portion 11b of the stationary side mounting ring 11. Further, the outer peripheral lip 15 is located on the outer peripheral side of the side lip 14, rises in a radial direction from the outer peripheral portion of the portion of the base portion 16 facing the outer space A, and further has a conical cylindrical shape facing the outer space A side. The distal end portion 15a is slidably in close contact with the inner peripheral surface of the outer peripheral cylindrical portion 11a in the stationary attachment ring 11.

  A large number of rod-shaped rotating blades arranged on the outer peripheral portion of the common base portion 16 of the side lip 14 and the outer peripheral lip 15 and located on the outer side (external space A side) of the side lip 14 and the outer peripheral lip 15 and arranged in the circumferential direction. 17 is formed. That is, the rotating blade 17 is also made of a rubber-like elastic material continuous with the side lip 14 and the outer peripheral lip 15, extends in the radial direction, and an outer diameter end portion 17 a thereof is an outer peripheral cylinder in the stationary side mounting ring 11. It is closely opposed to the inner peripheral surface of the part 11a through a close or slight gap so as to be slidable.

  As shown in FIG. 1, the sealing device 10 having the above configuration includes a side lip 14 and an outer peripheral lip 15 that rotate integrally with the inner ring 2, and an inner peripheral flange portion 11 b of the non-rotating stationary side mounting ring 11. An inner peripheral lip 13, which is slidably in close contact with the outer peripheral cylindrical portion 11 a and is a non-rotating stationary seal lip, is slidable with the inner peripheral cylindrical portion 12 a of the rotating side mounting ring 12 that rotates integrally with the inner ring 2. By being in close contact with each other, dust and muddy water or the like can be prevented from entering the bearing interior B from the outer space A, and grease can be prevented from flowing out from the bearing interior B.

  Here, dust, muddy water, and the like from the external space A try to enter the outer peripheral lip 15 side through the slits 17b between the rotary blades 17, but integrally with the inner ring 2 via the rotary side mounting ring 12. The rotating rotating blade 17 suppresses intrusion of dust, muddy water, and the like by a swinging action by centrifugal force and a labyrinth sealing action of the rotating slit 17b. In addition, the rotary blade 17 does not seal the space C between the outer peripheral lip 15 and generates an air flow due to the above-described swinging. Therefore, in order to promote heat dissipation from the outer peripheral lip 15, The deterioration of the rubber material can be prevented, and an increase in torque can be suppressed.

  3 and 4 are partial sectional perspective views showing examples of the shape of the rotary blade 17 in the above-described embodiment. Among these, the sealing device 10 shown in FIG. 3 has a rotating blade 17 formed in a mountain shape, and the sealing device 10 shown in FIG. 4 includes the rotating blade 17 and an outer diameter end portion 17a forming an arc surface. It is formed in a shape (U-shape). In this way, even if the outer diameter end portion 17a of the rotary vane 17 is slid on the inner peripheral surface of the outer peripheral cylindrical portion 11a of the stationary attachment ring 11, the contact area is small, so that the increase in sliding torque is suppressed. It is done.

  Next, FIG. 5 is a sectional view showing a second embodiment of the sealing device according to the present invention, and FIG. 6 is a partial sectional perspective view of the same. In the sealing device 10 according to this embodiment, the difference from the first embodiment described above is that the end of the rotating blade 17 opposite to the outer space A is continuous with the outer peripheral lip 15 and the outer diameter end of the rotating blade 17. The part 17a is in non-contact with the inner peripheral surface of the outer peripheral cylinder part 11a of the stationary side attachment ring 11, and has a shape that extends in the axial direction.

  Also in this second embodiment, the rotating blade 17 that rotates integrally with the inner ring 2 via the rotation-side mounting ring 12 has dust and muddy water due to the swinging action by centrifugal force and the labyrinth sealing action of the rotating slit 17b. In addition, it suppresses the intrusion of the material and the like, and also generates an air flow to promote heat dissipation from the outer peripheral lip 15, so that deterioration of the rubber material due to accumulation of sliding heat can be prevented. Further, since the rotary blade 17 is not in contact with the outer peripheral cylindrical portion 11a of the stationary side mounting ring 11, no sliding torque is generated.

  Next, FIG. 7 is sectional drawing which shows the 3rd form of the sealing device based on this invention. A sealing device 20 according to this embodiment is incorporated between a shaft 3 in a suspension of a construction machine or the like and a rotary housing 4 supported on the outer periphery of the shaft 3 via a bearing (not shown). This prevents intrusion of muddy water or the like into B ′.

  The sealing device 20 is integrated with the stationary side mounting ring 21, which is press-fitted to the outer peripheral surface of the shaft 3, the rotational side mounting ring 22 that is tightly fitted and fixed to the inner peripheral surface of the rotating housing 4, and the stationary side mounting ring 21. The outer peripheral lip 23 is provided, and the side lip 24 and the inner peripheral lip 25 are provided integrally with the rotation side mounting ring 22. Here, the shaft 3 is non-rotating and corresponds to the stationary member described in claim 1, the rotating housing 4 corresponds to the rotating member described in claim 1, and the outer peripheral lip 23 is claimed. The side lip 24 and the inner peripheral lip 25 correspond to the rotary side seal lip described in claim 1.

  Specifically, the stationary side mounting ring 21 is manufactured by punching and pressing a metal plate such as a steel plate, and the shape (cross-sectional shape shown in the drawing) cut along a plane passing through the axis is substantially L-shaped. The inner peripheral cylindrical portion 21a is press-fitted to the outer peripheral surface of the shaft 3, and the inner peripheral flange portion 21b extends from the end of the bearing side space B ′ to the outer peripheral side.

  Similarly, the rotating side mounting ring 22 is manufactured by punching and pressing a metal plate such as a steel plate, and the shape (cross-sectional shape shown in the drawing) cut along a plane passing through the axis is substantially L-shaped. It comprises an outer peripheral cylindrical portion 22a that is press-fitted into the inner peripheral surface of the rotating housing 4, and an inner peripheral flange portion 22b that extends from the end portion on the outer space A side to the inner peripheral side.

  The outer peripheral lip 23 is positioned and set in a mold (not shown) in which a stationary side attachment ring 21 pre-applied with a vulcanized adhesive is clamped, and is defined between the mold and the stationary side attachment ring 21. The molded cavity is filled with an unvulcanized rubber material, heated and pressed to be integrally formed with the stationary side mounting ring 21, and the base portion 23 a is formed on the outer circumferential surface of the stationary side mounting ring 21. Vulcanized and bonded to the outer diameter portion of the portion 21b, extends from there to the outer peripheral side so as to taper and face the opposite side to the bearing side space B ′, and the outer peripheral end portion 23b is an outer peripheral cylinder in the rotating side mounting ring 22 It is slidably in close contact with the inner peripheral surface of the portion 22a.

  The side lip 24 and the inner peripheral lip 25 are positioned and set in a mold (not shown) with a vulcanizing adhesive applied in advance, and the mold is clamped. In the molding cavity defined between the two, an unvulcanized rubber material is filled, heated and pressurized, and formed integrally with the rotation-side mounting ring 22. It is vulcanized and bonded to the inner diameter portion of the inner peripheral flange portion 22b of the rotation side mounting ring 22.

  Of these, the side lip 24 is located on the inner peripheral side of the outer peripheral lip 23 and is formed into a conical cylinder shape having a small diameter at the tip end side from the inner peripheral portion of the base portion 26 facing away from the external space A. The distal end portion 24a is slidably in close contact with the inner surface of the outer peripheral flange portion 21b of the stationary side mounting ring 21. Further, the inner peripheral lip 25 is located on the inner peripheral side of the side lip 24, rises in the radial direction from the portion of the base portion 26 facing away from the outer space A, and further faces the outer space A side. It is formed in a conical cylinder shape, and the inner peripheral tip 25a is slidably in close contact with the outer peripheral surface of the inner peripheral cylinder 21a in the stationary side mounting ring 21.

  A large number of rod-like rotations arranged on the outer peripheral portion of the common base portion 26 of the side lip 24 and the inner peripheral lip 25 and located on the outer side (external space A side) than the side lip 24 and the outer peripheral lip 25 and arranged in the circumferential direction. A blade 27 is formed. That is, the rotary blade 27 is also made of a rubber-like elastic material continuous with the side lip 24 and the inner peripheral lip 25, extends in the radial direction, and an inner diameter end portion 27 a of the inner peripheral edge of the stationary side mounting ring 21. The cylinder portion 21a is slidably in close contact with the outer peripheral surface via a slight gap.

  In the sealing device 20 having the above configuration, the side lip 24 and the inner peripheral lip 25 that rotate integrally with the rotary housing 4 slide on the outer peripheral flange portion 21b and the inner peripheral cylindrical portion 21a of the non-rotating stationary attachment ring 21. The outer peripheral lip 23, which is movably brought into close contact and is a non-rotating stationary side seal lip, is slidably brought into close contact with the outer peripheral cylindrical portion 22 a of the rotary side mounting ring 22 that rotates integrally with the rotary housing 4, This prevents intrusion of dust, muddy water, and the like from the external space A into the bearing side space B ′.

  Here, dust, muddy water, and the like from the external space A try to enter the inner lip 25 side through the slits 27 b between the rotary blades 27, but are integrated with the rotary housing 4 via the rotary side attachment ring 22. The rotating blade 27 that rotates automatically suppresses intrusion of dust, muddy water, and the like by a swinging action by centrifugal force and a labyrinth sealing action of the rotating slit 27b. In addition, the rotary blade 27 does not seal the space C ′ between the inner peripheral lip 25 and generates an air flow due to the above-described swinging motion. It is possible to prevent deterioration of the rubber material due to accumulation of torque and to suppress an increase in torque.

  Even in the individual form, the inner diameter end of the rotary blade 27 with respect to the outer peripheral surface of the inner peripheral cylindrical portion 21a of the stationary side mounting ring 21 is the same as in FIG. 3 or FIG. The contact area of the portion 27a is reduced, and an increase in sliding torque is suppressed.

  Next, FIG. 8 is sectional drawing which shows the 4th form of the sealing device based on this invention. The sealing device 20 according to this embodiment is different from the third embodiment described above in that the end of the rotating blade 27 opposite to the outer space A is continuous with the inner peripheral lip 25 and the inner diameter end of the rotating blade 27. The part 27a is in non-contact with the outer peripheral surface of the inner peripheral cylinder part 21a of the stationary side attachment ring 21, and has a shape that extends in the axial direction.

  Also in the fourth embodiment, the rotating blade 27 that rotates integrally with the rotating housing 4 via the rotating side mounting ring 22 is free of dust and dirt due to the swinging action by centrifugal force and the labyrinth sealing action of the rotating slit 27b. While suppressing the intrusion of muddy water and the like and generating an air flow to promote heat dissipation from the inner peripheral lip 25, it is possible to prevent deterioration of the rubber material due to accumulation of sliding heat. Further, since the rotary blade 27 is not in contact with the inner peripheral cylindrical portion 21a of the stationary side mounting ring 21, no sliding torque is generated.

It is sectional drawing which shows the 1st form of the sealing device which concerns on this invention. It is a partial section perspective view of the 1st form. It is a partial section perspective view showing the example of the shape of the rotary blade in the 1st form. It is a partial section perspective view showing other examples of shape of a rotary blade in the 1st form. It is sectional drawing which shows the 2nd form of the sealing device which concerns on this invention. It is a partial section perspective view of the 2nd form. It is sectional drawing which shows the 3rd form of the sealing device which concerns on this invention. It is sectional drawing which shows the 4th form of the sealing device which concerns on this invention. It is sectional drawing which shows the conventional sealing device.

Explanation of symbols

1 Outer ring (stationary member)
2 Inner ring (rotary member)
3 axis (stationary member)
4 Rotating housing (Rotating side member)
10, 20 Sealing device 11, 21 Stationary side mounting ring 12, 22 Rotation side mounting ring 13 Inner peripheral lip (stationary side seal lip)
14, 24 Side lip (Rotary seal lip)
15 Outer lip (rotary side seal lip)
16, 26 Base 17, 27 Rotating blade 23 Outer lip (static seal lip)
25 Inner lip (rotary seal lip)
A External space B Bearing internal B 'Bearing side space

Claims (1)

  A stationary side mounting ring (11, 21) that is tightly fitted and fixed to the stationary side member (1, 3), and a rotating side mounting ring (12, 22) that is tightly fitted and fixed to the rotating side member (2, 4); A stationary side seal lip (13, 23) provided integrally with the stationary side mounting ring (11, 21) and having a tip slidably in contact with the rotating side mounting ring (12, 22); Provided integrally with the rotating side mounting ring (12, 22), the tip end is slidably in close contact with the stationary side mounting ring (11, 21), and outside the stationary side seal lip (13, 23). The rotation side seal lip (14, 15, 24, 25) is provided, and the rotation side seal lip (14, 15) is provided at the base (16, 26) of the rotation side seal lip (14, 15, 24, 25). , 24, 25) and a plurality of rotating blades (17 27) a sealing device, characterized in that has been formed.

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