JP2008019905A - Sealed roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed roller bearing device that secures water resistance of a sealing device by ensuring positioning of a slit relative to an outer ring. <P>SOLUTION: A protruding part serving as a mark 25 is provided on the outer peripheral surface 24 of a large diameter part 23 serving as a mating surface with the outer ring 2. With the circumferential position of the mark 25 aligned with the circumferential position of the slit 44, a seal body 35 is secured to a seal case 20. To place the slit 44 in a position that is as high as possible, the sealing device 31 is mounted on the outer ring 2 while the circumferential position of the slit is fixed. In this case, a dented part 26 that fits over the protruding part serving as the mark 25 is provided in an area that serves as a mating surface on the inner periphery of the outer ring 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing device, and more particularly to a sealed rolling bearing device including a sealing device.

  A typical bearing device provided with a sealing device is a bearing device for a railway vehicle axle. A so-called double-row tapered roller bearing is usually used in a bearing device for a railway vehicle axle, and an outer ring, a pair of inner rings, a double-row tapered roller, and a tapered roller in each row are held at predetermined intervals in the circumferential direction. A cage is provided as a main component. The sealing device is usually attached to both ends of the outer ring. Then, the seal of each sealing device is in sliding contact with a predetermined interference with the oil drain disposed on one end side of the axle or the rear lid disposed on the other end side of the pair of inner rings. It has become.

  FIG. 4 shows an example of the sealing device. The sealing device 30 in FIG. 1 includes a seal case 16 fitted and fixed to the outer ring 2, a metal ring 18 fitted to the seal case 16, and a metal core 32 fitted to the metal ring 18, such as rubber. A seal main body 35 integrally formed with a seal portion 34 formed of a material is mainly provided. A main lip 38 slidably in contact with the rear lid 14 extends from the inner diameter end of the disk portion 36 integrated with the core metal 32 in the seal portion 34 to the bearing side. Further, a dust lip 40 that is in sliding contact with the rear lid 14 on the far side of the bearing from the main lip 38 extends to the side opposite to the bearing.

  In this type of sealing device 30, for example, a slit 44 penetrating in the axial direction is provided in the disk portion 36 of the seal portion 34 for the purpose of minimizing pressure fluctuations in the seal internal space due to repeated use stoppage. Is known (see, for example, Patent Document 1).

Further, in this type of sealing device 30, normally, a convex portion 17 for preventing the outer ring 2 from coming off is provided at the outer peripheral tip of the seal case 16, and this is a concave portion provided on the inner periphery of the outer ring 2. The fixing force (prevention force) is increased by fitting with 19.
Japanese Patent Laid-Open No. 2005-133895

  By the way, since this type of rolling bearing is often used as a bearing for a railway vehicle axle as described above, it is required to have a configuration that can cope with changes in the usage environment.

  For example, when the bearing is used in the above-described application (for railcar axles), ensuring water resistance is indispensable. As described above, when the slit 44 (also referred to as a vent) for adjusting the internal pressure is provided in the seal portion 34, the slit 44 is used in order to prevent water accumulated in the lower portion of the bearing due to rain or the like from entering the inside of the bearing. Need to be placed at a position as high as possible. As a countermeasure for this, for example, a mark is provided in advance on the outer peripheral surface of the outer ring 2, and the slit 44 is placed in a state in which the mark and the slit 44 are aligned so that the positions in the circumferential direction are aligned. The provided sealing device 30 is attached to the outer ring 2.

  However, since the slit 44 is difficult to grasp (it is difficult to find) its circumferential position at a glance, it is difficult to find it at an early stage when assembling, and it takes time and effort to align with the mark. It takes. This is not a preferable method because it leads to deterioration of work efficiency. Or a slit may be arrange | positioned in an unpreferable position by misidentification, and there exists a possibility that it may not be able to prevent inundation from the outside in this case.

  In view of the above circumstances, an object of the present invention is to provide a sealed rolling bearing device that ensures the water resistance of the sealing device by reliably aligning the slit with the outer ring.

  In order to solve the above-described problems, the present invention provides an outer ring and an inner ring that form a rolling raceway of rolling elements between opposing surfaces, a seal case that is fitted and fixed to the inner peripheral surface of the outer ring, and a bearing case that is fixed to the seal case. A seal body that seals the space and a slit that is provided in the seal body and communicates with the outside air in the bearing internal space, and is provided with a mark on the seal case for indicating the circumferential position of the slit. A sealed rolling bearing device is provided.

  In this way, by providing a mark indicating the circumferential position of the slit on the seal case side, the circumferential position of the slit provided in the seal body can be determined by looking at the seal case, for example, by looking at the outer peripheral surface. can do. In other words, when fixing the seal body to the seal case, if the circumferential position of the slit relative to the mark of the slit is confirmed, the seal body attached to the seal case is attached to the outer ring while grasping the circumferential position of the slit. Can be attached to. This makes it possible to easily and quickly attach the seal body provided with the slit to the outer ring. In addition, if the seal body is fixed to the seal case with the circumferential position of the mark coincident with the circumferential position of the slit, the position of the slit will always be the same when attached to the outer ring of the seal case. The attachment can be performed more reliably.

  In addition, when this type of bearing is used in the above-described applications, it is necessary to consider vibration resistance and impact resistance in addition to water resistance. That is, the vibration or impact acting on the bearing tends to increase as the speed of the railway vehicle increases, so that the seal case may fall off the outer ring depending on the degree of vibration.

  Therefore, in the present invention, the mark is configured to be engaged with the outer ring in the axial direction. In this way, by making the mark also have a retaining function, it is efficient because it is not necessary to provide an engaging part separately from the mark. Further, in this case, if the protrusion is provided on the fitting surface of the seal case as a mark, and the concave portion that fits the protrusion is provided on the fitting surface of the outer ring, the visual confirmation of the mark is further facilitated. Therefore, it is preferable.

  In addition to the mark that forms the engaging portion, a retaining portion can be further provided between the fitting surface of the seal case and the fitting surface of the outer ring. According to this configuration, the retaining force between the seal case and the outer ring can be further improved. Further, for example, the convex portion and the concave portion forming the retaining portion are not for specifying the circumferential position as in the case of the mark, and therefore, for example, it is possible to take a shape extending annularly in the circumferential direction. According to this, the engagement area between the said convex part and a recessed part can be increased, and the retaining force can be raised further. This retaining portion may be provided at one place or at two or more places.

  As described above, according to the present invention, in this type of sealed rolling bearing device, even when a slit for pressure adjustment is provided, the positioning of the slit with respect to the outer ring can be reliably performed. Water resistance can be ensured. In addition, it is possible to improve the retaining force with respect to the outer ring by configuring the mark for alignment to be engaged with the outer ring in the axial direction.

  Hereinafter, an embodiment of a sealed rolling bearing device 1 according to the present invention will be described with reference to the drawings. Elements that are substantially the same as those in FIG. 4 described above are denoted by the same reference numerals.

  FIG. 2 shows a configuration example of a sealed rolling bearing device 1 according to an embodiment of the present invention. This bearing device 1 is used, for example, as a railway vehicle axle bearing, and includes an outer ring 2, a pair of inner rings 4, a tapered roller 6 as a rolling element in a double row, and a tapered roller 6 in each row. A retainer 8 that holds at a predetermined interval in the circumferential direction and a sealing device 31 that is attached to both ends of the outer ring 2 are provided as main components.

  In this embodiment, the outer ring 2 is incorporated in a shaft box (not shown), and the pair of inner rings 4 are fitted to the shaft end portion of the axle 10. An oil drain 12 is disposed on one end side of the axle 10 with the pair of inner rings 4 interposed therebetween, and a rear lid 14 is disposed on the opposite side (the other end side). Therefore, a main lip 38 and a dust lip 40, which will be described later, of the sealing device 31 attached to both ends of the outer ring 2 are in sliding contact with the oil drain 12 and the rear lid 14 with a predetermined interference.

  As shown in FIG. 1, the sealing device 31 includes a seal case 20, a metal ring 18, a cored bar 32, and a seal body 35. The seal case 20 is made of metal and has a three-stage cylindrical shape. Among these, the large-diameter portion 23 is fitted and fixed to the inner periphery of the outer ring 2 with press-fitting, for example, so that the sealing device 31 is fixed to the outer ring 2. The middle diameter portion 22 and the small diameter portion 21 constitute a labyrinth seal between the step portion inner diameter surface of the rear lid 14 (or the oil drainer 12) and the annular groove. Further, a convex portion (first convex portion) 17 extending annularly in the circumferential direction is provided at the distal end of the outer peripheral surface 24 of the large-diameter portion 23 that becomes a fitting surface with the outer ring 2, and the inner periphery of the outer ring 2 is fitted. A concave portion (first concave portion) 19 that fits with the first convex portion 17 is provided in the area that becomes the mating surface. The first convex portion 17 and the first concave portion 19 are engaged with each other in the axial direction and function as a retaining portion of the seal case 20 in a state in which the removal force from the outer ring 2 acts on the seal case 20. It is supposed to be.

  The metal ring 18 has an L-shaped cross section, and is fitted and fixed to the inner periphery of the middle diameter portion 22 of the seal case 20. A cylindrical portion of the cored bar 32 is fitted into the inner periphery of the metal ring 18, whereby a seal body 35 described later is fixed to the seal case 20 via the metal ring 18.

  The seal body 35 includes a cored bar 32 and a seal part 34 that is fixed and integrated with a disk part 33 that extends in the radial direction of the cored bar 32. The seal portion 34 is formed of a heat-resistant flexible material such as rubber, and is integrated with a disc portion 36 that is integrated with the cored bar 32 by seizing or the like, and from the inner diameter end of the disc portion 36 to the bearing side (large seal case 20). The main lip 38 extends to the diameter portion 23 side, and the dust lip 40 extends from the inner diameter end of the disk portion 36 to the opposite side of the main lip 38 (the small diameter portion 21 side). In this embodiment, the main lip 38 is connected to the disk portion 36 or the dust lip 40 via the cylindrical portion 39. Grease is applied to the annular space between the main lip 38 and the dust lip 40 for sealing lip lubrication. The rear lid 14 (or the oil drainer 12) has a fitting force from the main lip 38 and a diameter reducing force from the garter spring 41 due to the difference between the outer diameter of the rear lid 14 and the inner diameter of the tip of the lip 38. A predetermined tightening force is secured so that lubricant (grease) inside the bearing does not flow out. On the other hand, the dust lip 40 on the outer side of the bearing acts on the rear lid 14 with the fitting force from the dust lip 40 due to the difference between the outer diameter of the rear lid 14 (or oil drain 12) and the inner diameter of the tip of the lip 40. This prevents foreign matter and moisture from entering from the outside.

  A partial region in the circumferential direction of the disk portion 36 of the seal portion 34 is formed thin as shown in FIG. Accordingly, a through hole is provided in the disk portion 33 of the cored bar 32. The thin portion 42 is provided with a slit 44 penetrating the thin portion 42 so as to extend in the radial direction. The slit 44 serves as a vent so that the seal internal space defined by the cored bar 32, the seal portion 34, and the metal ring 18 communicates with the outside air. As a result, when the bearing is operated or stopped, the pressure in the internal space of the seal is excessively increased or negative pressure is avoided as much as possible, and the space is maintained at normal pressure.

  The sealing device 31 having the above configuration is fixed to the outer ring 2 by fitting and fixing the large-diameter portion 23 of the seal case 20 to the inner periphery of the outer ring 2 as described above. At this time, by providing the seal case 20 with a mark 25 for displaying the circumferential position of the slit 44, the circumferential position of the slit 44 is determined when the sealing device 31 is fixed to the outer ring 2. Can be easily judged. Thus, the sealing device 31 can be easily and quickly attached to the outer ring 2 with the circumferential position determined so that the slit 44 is positioned as high as possible. In this case, even when used in an atmosphere where water falls or where water is dripping, it is possible to avoid as much as possible the situation where water enters from the slit 44. In the illustrated example, the mark 25 is provided on the outer peripheral surface 24 of the seal case 20 as shown in FIG. Further, the seal body 35 is fixed to the seal case 20 so that the circumferential position of the mark 25 and the circumferential position of the slit 44 coincide.

  Further, in this embodiment, as the mark 25, the protrusion is provided on the fitting surface (outer peripheral surface 24) of the seal case 20, and the fitting surface of the outer ring 2 is provided with the recess 26 that fits the protrusion. In a state in which the seal case 20 is fitted and fixed to the inner periphery of the outer ring 2, the protrusion as the mark 25 is engaged with the recess 26 in the axial direction and acts as a retaining member. Therefore, in addition to the retaining force due to the engagement between the first convex portion 17 and the first concave portion 19, it is possible to further improve the retaining force for the outer ring 2 of the sealing device 31.

  In the above, one embodiment of the sealed rolling bearing device 1 according to the present invention has been described. However, the sealed rolling bearing device 1 according to the present invention has other configurations as long as the mark 25 is provided on the seal case 20. It is also possible to adopt.

  For example, on the outer peripheral surface 24 of the seal case 20 serving as a fitting surface with the outer ring 2, as shown in FIG. 3, in addition to the marks (projections) 25 and the first protrusions 17, a second protrusion extending in an annular shape is provided. A portion 27 can also be provided. In this case, the second recess 28 is provided in a region where the seal case 20 is fixed to the outer ring 2 in a region where the seal case 20 is fitted to the second protrusion 27 in a state where the seal case 20 is fixed to the outer ring 2. The two convex portions 27 and the second concave portion 28 constitute a retaining portion. Thereby, the further improvement of the retaining force can be aimed at.

  In this case, the protrusion height of the second protrusion 27 from the outer peripheral surface 24 is preferably lower than the protrusion height of the first protrusion 17. In addition, it is desirable that the amount of recess (depth) of the second recess 28 from the inner peripheral surface of the outer ring 2 is smaller than the protrusion height of the first protrusion 17. This is because, when the large diameter portion 23 is fitted and fixed to the outer ring 2, if there is a sufficiently large recess (second recess 28) in front of the portion (first recess 19) where the large diameter portion 23 is originally fitted, the recess 28. This is because the convex portion (first convex portion 17) on the tip end side is fitted into the rim, and there is a possibility that the fitting is not smoothly performed. Alternatively, forcibly press-fitting may cause the convex portion 17 to be lost.

  In FIG. 1, the first convex portion 17 is provided on the distal end side of the large diameter portion 23 with respect to the mark 25, and in FIG. 3, the first convex portion 17 is larger than the mark 25 and the second convex portion 27. Although the case where it is provided on the distal end side of the diameter portion 23 is illustrated, it is not necessary to be limited to this arrangement mode. That is, as described above, as long as the fitting and fixing of the seal case 20 to the outer ring 2 is performed smoothly, even if the mark 25 is a protrusion, the mark 25 is larger than the first convex part 17. It can also be provided on the tip side. Alternatively, the mark 25 can be provided between the first convex portion 17 and the second convex portion 27. In these cases, it goes without saying that the arrangement positional relationship of the recess 26 and the first and second recesses 19 and 28 can also be changed.

It is sectional drawing of the sealing device provided in the sealing type rolling bearing apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the sealing type rolling bearing apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the sealing device which concerns on the other structural example of a sealing type rolling bearing apparatus. It is sectional drawing of the conventional sealing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing type rolling bearing apparatus 2 Outer ring 4 Inner ring 14 Back cover 17 First convex part 19 First concave part 20 Seal case 23 Large diameter part 24 Outer peripheral surface (fitting surface)
25 Mark (projection)
26 Depressed part 27 Second convex part 28 Second concave part 31 Sealing device 34 Sealing part 36 Disk part 38 Main lip 40 Dustrip 44 Slit

Claims (4)

An outer ring and an inner ring that form a rolling raceway of rolling elements between opposing surfaces, a seal case that is fitted and fixed to the inner peripheral surface of the outer ring, a seal body that is fixed to the seal case and seals the bearing internal space, and a seal body In a sealed rolling bearing device provided with a slit that is provided and communicates with the outside space of the bearing,
A sealed rolling bearing device, characterized in that a mark indicating the circumferential position of the slit is provided on the seal case.   2. The hermetic rolling bearing device according to claim 1, wherein the circumferential position of the mark coincides with the circumferential position of the slit.   2. The sealed rolling bearing device according to claim 1, wherein the mark is engaged with the outer ring in the axial direction.   The sealed rolling bearing device according to claim 1, wherein a retaining portion is provided between the fitting surface of the seal case and the fitting surface of the outer ring.

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