JP2010116107A - Axle device for railway vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an axle device for a railway vehicle where fretting wear hardly occurs on the end face of an inner ring and on the end face of a positioning member which abuts on the end face of the inner ring. <P>SOLUTION: Between the end face on the wheel side of a second inner ring 7 of a double-row cylindrical roller bearing 2 arranged on an axle 1 of the railway vehicle and the end face on the side of the second inner ring 7 of a rear cover 3 which is arranged on the axle 1 and located on the wheel side of the second inner ring 7, a plurality of stainless shims 50 are arranged which are held between the two end faces and overlapped with one another in the axial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a railcar axle device that includes an axle of a railway vehicle, an axle box, and a rolling bearing that rotatably supports the axle with respect to the axle box.

  It is known that the weight of a vehicle consisting of several tons to several tens of tons is applied to the axle of a railway vehicle as a radial load, so that both ends of the axle are sunk downward and the center is swollen (bending).

  In a railway vehicle axle apparatus comprising: an axle of a railway vehicle; a rolling bearing externally fitted to the axle; and an annular rear lid that is externally fitted to the axle and contacts the rolling bearing in the axial direction. Due to the bending, a minute relative reciprocating sliding motion, that is, fretting occurs in the radial direction between the axial end surface of the inner ring and the axial end surface of the rear lid contacting the end surface. It is known that minute wear occurs on the end faces. It is known that the wear powder generated by the fretting enters the lubricant enclosure in which the bearing is disposed, thereby shortening the bearing life.

  As a railcar axle device capable of suppressing the fretting wear, there is one described in Japanese Patent Laid-Open No. 8-128451 (Patent Document 1).

This railcar axle device suppresses fretting wear due to fretting by interposing a lubricant on a contact surface between an inner ring of a rolling bearing installed on the axle and a rear cover. However, this measure has a problem that fretting wear cannot be sufficiently suppressed.
JP-A-8-128451 (FIG. 1)

  Therefore, an object of the present invention is to provide an axle device for a railway vehicle in which fretting wear is unlikely to occur on an end surface of an inner ring and an end surface of a positioning member that contacts the end surface of the inner ring.

In order to solve this problem, an axle device for a railway vehicle according to the present invention includes:
The axle of the railway vehicle,
The axle box,
An inner ring fitted to the outer peripheral surface of the axle;
An outer ring fitted to the inner peripheral surface of the axle box;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring,
An annular positioning member that is disposed on the outer peripheral surface of the axle and that positions the inner ring in the axial direction with respect to the axle;
A plurality of annular plates sandwiched between the axial end face of the inner ring and the axial end face of the positioning member and overlaid in the axial direction;
A lubricant is applied to one end face and the other end face in the axial direction of each of the annular plates.

  According to the present invention, a plurality of stacked annular plates are sandwiched between the axial end surface of the inner ring and the axial end surface of the positioning member, and the relative position of the positioning member with respect to the inner ring When the variation occurs, the variation is absorbed by the plurality of annular plates, so that two adjacent members (inner ring and annular plate, annular plate and annular plate, or annular plate and positioning) The variation in the relative position of the member is reduced. Accordingly, the fretting wear between the two members adjacent to each other is reduced, and the fretting wear of the inner ring, the annular plate and the positioning member is caused by slight fluctuations in the relative position of the positioning member with respect to the inner ring. Can be significantly reduced. Therefore, the amount of wear powder that enters the sealed chamber in which the rolling bearing is disposed can be suppressed, and the life of the axle device can be extended.

In one embodiment,
One end surface in the axial direction of each annular plate has a flat portion and a convex portion projecting outward in the axial direction from the flat portion, while the other end surface in the axial direction of each annular plate is a flat portion. And a concave portion recessed inward in the axial direction from the flat portion,
The convex portion of each annular plate is located in the concave portion of the annular plate adjacent to the annular plate,
The flat portion of the one end surface of each annular plate is in contact with the flat portion of the other end surface of the annular plate adjacent to the annular plate,
A lubricant is disposed in the concave portion of each annular plate.

  According to the above embodiment, since the convex portion of the annular plate adjacent to the annular plate is accommodated in the concave portion of the annular plate, the relative movement in the radial direction of the annular plate adjacent in the axial direction can be limited. It is possible to prevent the stacked annular plates from being scattered.

  Further, according to the embodiment, since the lubricant is present in the recesses of the respective annular plates, the lubricant is moved from the recesses toward the flat portion when there is a change in relative position between the adjacent annular plates. Or the lubricant that was present between the flat portions of the annular plate enters the concave portion to lubricate the sliding portions of the flat portions of the annular plate that are in contact with each other. it can. Therefore, fretting wear that occurs in adjacent annular plates can be reduced.

In one embodiment,
The plurality of annular plates are disposed between the inner ring and the positioning member in a state where all or a part of the annular plates are in contact with the outer peripheral surface of the axle.

  According to the said embodiment, the movement of the radial direction of the cyclic | annular board which is contacting the outer peripheral surface of the said axle shaft can be suppressed, and it can suppress that the piled cyclic | annular board is scattered.

  According to the railcar axle device of the present invention, when a change in the relative position of the positioning member with respect to the inner ring occurs, the change is absorbed by the portions of the plurality of annular plates. Variations in the relative positions of the members themselves are reduced. Therefore, fretting wear generated between two adjacent members can be remarkably reduced, the amount of wear powder entering the sealed chamber where the rolling bearing is arranged can be suppressed, and the life of the axle device can be extended. Can do.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a railcar axle device according to a first embodiment of the present invention.

  This railcar axle device constitutes a part of the railcar. This railcar axle device includes an axle 1, a double-row tapered roller bearing 2 as an example of a rolling bearing, an annular rear lid 3 as an example of a positioning member, and an oil drain 4.

  The double row tapered roller bearing 2 supports the axle 1 in a freely rotatable manner. The double row tapered roller bearing 2 includes a first inner ring 6, a second inner ring 7, an outer ring 8, a plurality of first tapered rollers 10 as rolling elements, and a plurality of second tapered rollers 11 as rolling elements. The first inner ring 6 and the second inner ring 7 constitute a composite inner ring.

  The axle 1 has a cylindrical outer peripheral surface portion 14 and an enlarged diameter outer peripheral surface portion 17, and the enlarged diameter outer peripheral surface portion 17 is connected to the cylindrical outer peripheral surface portion 14. The diameter-enlarged outer peripheral surface portion 17 has an outer diameter that increases with distance from the cylindrical outer peripheral surface portion 14 in the axial direction. The diameter-enlarged outer peripheral surface portion 17 has a substantially parabolic shape in the axial cross section.

  The first inner ring 6 has a conical track surface 21 on the outer periphery. The second inner ring 7 has a conical track surface 22 on the outer periphery. The outer diameter of the conical raceway surface 21 of the first inner ring 6 becomes smaller toward the conical raceway surface 22 side of the second inner ring 7, and the inner diameter of the conical raceway surface 22 goes to the conical raceway surface 21 side. Therefore, it is getting smaller. The first inner ring 6 and the second inner ring 7 have the same inner diameter, and the end surface on the small diameter side of the conical raceway surface 21 of the first inner ring 6 is the end surface on the small diameter side of the conical raceway surface 22 of the second inner ring 7. It is in contact.

  On the other hand, the outer ring 8 is fitted to the inner peripheral surface of the axle box 9. The outer ring 8 has a first conical track surface 31 and a second conical track surface 32 that are adjacent in the axial direction. The inner diameter of the first conical raceway surface 31 decreases as it goes toward the second conical raceway surface 32, and the inner diameter of the second conical raceway surface 32 decreases as it goes toward the first conical raceway surface 31. .

  The plurality of first tapered rollers 10 are held in the circumferential direction while being held by the first cage 41 between the conical raceway surface 21 of the first inner ring 6 and the first conical raceway surface 31 of the outer ring 8. They are spaced apart. The plurality of second tapered rollers 11 are held by the second cage 42 between the first conical raceway surface 22 of the second inner ring 7 and the second conical raceway surface 32 of the outer ring 8. Are arranged at intervals in the circumferential direction.

  The rear lid 3 is an annular member and has an enlarged inner peripheral surface portion 44 having a shape corresponding to the enlarged outer peripheral surface portion 17 of the axle 1. The rear cover 3 is fixed at a predetermined position of the axle 1 by fitting the enlarged inner peripheral surface portion 44 of the rear lid 3 into the enlarged outer peripheral surface portion 17 of the axle 1.

  The railcar axle device includes a plurality of annular shim 50 made of stainless steel. The plurality of superimposed shims 50 are sandwiched between the axially inner end surface (axial wheel) side end surface of the second inner ring 7 and the axially outer end surface of the rear lid 3.

  FIG. 2 is a perspective view showing a plurality of the annular stainless steel shims 50 that are stacked.

  As shown in FIG. 2, each of the shims 50 is an annular plate, and has an inner peripheral surface and an outer peripheral surface with the same central axis. Grease as an example of a lubricant is applied to one end face and the other end face in the axial direction of each shim 50. In this way, friction and wear between two adjacent shims 50 are reduced, and in the two adjacent shims 50, one shim 50 is held by the other shim 50, and the two adjacent shims 50 are retained. Are prevented from separating from each other. The plurality of shims 50 that are stacked and integrated have a substantially cylindrical shape.

  As shown in FIG. 1, the plurality of shims 50 having the substantially cylindrical shape include the second inner ring 7 and the rear so that all or some of the shims 50 are in contact with the outer peripheral surface of the axle 1. It is arranged between the lid 3.

  Further, the oil drain 4 is an annular member, and is located on the opposite side to the rear lid 3 side of the double row tapered roller bearing 2. The end face on one side in the axial direction of the oil drain 4 is opposed to the end face of the first inner ring 6 opposite to the second inner ring 7 side. The oil drainer 4 is applied with force to the rear lid 3 side by a front lid (not shown) fixed to the end of the axle 1 with a screw. The double row tapered roller bearing 2 is positioned in the axial direction by sandwiching the double row tapered roller bearing 2 between the oil drain 4 and the rear lid 3.

  A cylindrical seal case 37 is attached to the inner peripheral surface of one end portion of the outer ring 8 in the axial direction, and a cylindrical seal case 38 is attached to the inner peripheral surface of the other end portion of the outer ring 8 in the axial direction. It is attached. The seal case 37 and the oil drain 4 are sealed with a sealing device 47, and the seal case 38 and the rear lid 3 are sealed with a sealing device 48.

  According to the railcar axle device, the plurality of annular shims 50 are sandwiched between the axial end surface of the second inner ring 7 and the axial end surface of the rear lid 3, 2 When the change in the relative position of the rear lid 3 with respect to the inner ring 7 occurs, the change is absorbed by the portions of the plurality of shims 50. Therefore, two members adjacent to each other (the second inner ring 7 and the shim 50). The fluctuation of the relative position of the shim 50 and the shim 50 or between the shim 50 and the rear lid 3) itself is reduced. Accordingly, the fretting generated between two members adjacent to each other can be reduced, and the fretting wear generated due to small fluctuations in the relative position of the rear lid 3 with respect to the second inner ring 7 can be significantly reduced. Can be. Therefore, the amount of wear powder entering the sealed chamber in which the double row tapered roller bearing 2 is arranged can be suppressed, and the life of the axle device can be extended.

  In the railcar axle device according to the first embodiment, the plurality of shims 50 are formed between the second inner ring 7 and the rear lid 3 so that all or some of the shims 50 are in contact with the outer peripheral surface of the axle 1. In the present invention, all the annular plates may be positioned at a radial interval with respect to the outer peripheral surface of the axle.

  In the railcar axle device according to the first embodiment, the shim 50 as the annular plate is made of stainless steel. However, in the present invention, the annular plate may be made of a metal other than stainless steel. It may be made of resin.

  In the railcar axle device according to the first embodiment, the rolling bearing is the double row tapered roller bearing 2. In the present invention, in the rolling bearing, the rolling elements are arranged in one or more rows in the axial direction. The rolling elements may be arranged, and the rolling element may be a tapered roller, a cylindrical roller, or a combination of a tapered roller and a cylindrical roller, or a ball and a cylindrical roller. Further, the outer ring or the inner ring may be either an integral type or a composite type composed of a plurality of annular members.

  In the railcar axle device according to the first embodiment, the lubricant is grease. However, in the present invention, the lubricant may be a solid lubricant such as molybdenum disulfide.

  In the railcar axle device according to the first embodiment, the positioning member is the rear lid 3 positioned on the wheel side of the inner ring. In the present invention, the positioning member is positioned on the wheel side with respect to the inner ring. May be a drainer located on the opposite side. In addition, a plurality of annular plates may not be disposed between the inner ring and the rear lid, while a plurality of annular plates may be disposed between the inner ring and the oil drainer. In the present invention, the positioning member may be a rear lid positioned on the wheel side of the inner ring and an oil drainer positioned on the side opposite to the wheel side with respect to the inner ring. A plurality of annular plates may be disposed between the inner ring and the rear lid, and a plurality of annular plates may be disposed between the inner ring and the oil drainer.

  FIG. 3 is an enlarged schematic cross-sectional view showing the periphery of the second inner ring 107, the rear lid 103, and a plurality of the annular shims 151 stacked in the railcar axle device according to the second embodiment of the present invention.

  In the railcar axle device of the second embodiment, the description of the operation and effect common to the railcar axle device of the first embodiment will be omitted, and the railcar axle of the first embodiment will be omitted. Only configurations, operational effects, and modifications different from those of the apparatus will be described.

  As shown in FIG. 3, in the axle device of the second embodiment, one end face in the axial direction of each shim 151 constituting the plurality of annular shims 151 has a flat portion and a convex portion. The only difference from the axle device of the first embodiment is that the other end surface in the axial direction has a flat portion and a recess.

  FIG. 4 is an axial sectional view of the shim 151 showing the shim 151 in detail.

  As shown in FIG. 4, the end surface on one side in the axial direction of the shim 151 has a flat portion 153 and an annular convex portion 154 that protrudes outward in the axial direction from the flat portion 153. The other end surface in the axial direction has a flat portion 156 and an annular concave portion 157 that is recessed inward in the axial direction from the flat portion 156.

  The central axis of the annular convex portion 154 substantially coincides with the central axis of the annular concave portion 157 and substantially coincides with the central axis of the annular shim 151. The distance between the annular convex portion 154 and the central axis of the annular shim 151 is substantially equal to the distance between the annular concave portion 157 and the central axis of the annular shim 151.

  As shown in FIG. 4, the height dimension c of the convex portion 154 is smaller than the depth dimension d of the concave portion 157, and the radial width a of the base end portion of the convex portion 154 is equal to that of the concave portion 157. It is smaller than the radial width b of the opening.

  As shown in FIG. 5, the plurality of shims 151 are overlapped so that the convex portion 154 of the shim 151 is immersed in the concave portion 157 of the shim 151 adjacent to the shim 151. The flat portions 153 and 156 of the shim 151 are in contact with the flat portions 156 and 153 of the shim 151 adjacent to the shim 151 in the axial direction. After the plurality of shims 151 are overlaid, grease 159 as an example of a lubricant is sealed between the flat portion 153 and the convex portion 154 of one shim 151 and the concave portion 157 of the other shim 151. .

  According to the railcar axle device of the second embodiment, since the convex portion 154 of the shim 151 adjacent to the shim 151 is accommodated in the concave portion 157 of the shim 151, the shim 151 adjacent in the axial direction is accommodated. Relative movement in the radial direction can be restricted, and the overlapped shims 151 can be prevented from separating.

  Further, according to the railcar axle device of the second embodiment, since the grease 159 exists in the recess 157 of each shim 151, when the relative position varies between the adjacent shims 151. The lubricant is discharged from the concave portion 157 toward the flat portions 153 and 156 contacting each other, or the grease 159 existing between the flat portions 153 and 156 of the shim 151 overlapping each other enters the concave portion 157. Thus, the sliding portions of the flat portions 153 and 156 of the shim 151 that are in contact with each other can be lubricated. Therefore, fretting wear occurring in the adjacent shims 151 can be reduced. Further, since the grease can be accommodated in the recess 157, it is possible to suppress the grease from running out.

  A recess having substantially the same shape as the recess 157 of the shim 151 is formed on either the end surface on the positioning member side of the inner ring or the end surface on the inner ring side of the positioning member. In the plurality of annular plates overlaid on the recess, when the axially outward convex portion of the annular plate located at one end is immersed, the plurality of annular plates overlaid on the inner ring or the positioning member The range of relative movement in the radial direction can be limited, which is preferable.

  In the railcar axle device according to the second embodiment, the annular protrusion and the annular recess are formed on the shim 151. However, in the present invention, a non-annular protrusion may be formed on the annular plate. Moreover, you may form the recessed part which is not cyclic | annular. In short, in this invention, the convex portion of each annular plate is located in the recess of the annular plate adjacent to the annular plate, and the flat portion of one end surface of each annular plate is adjacent to the annular plate. As long as it is in contact with the flat portion of the other end surface of the first plate and the lubricant is disposed in the concave portion of each annular plate, any shape of convex portions may be formed on the annular plate. A recess may be formed.

  In the railcar axle device of the second embodiment, one end surface in the axial direction of the annular shim 151 has one convex portion 154, and the other end surface in the axial direction of the shim 151 has one In the present invention, the one end face and the other end face in the axial direction of the annular plate have one or more protrusions, but may not have a recess. On the other hand, it may have one or more recesses. In the present invention, one end surface and the other end surface in the axial direction of the annular plate may have one or more convex portions and one or more concave portions. In short, in this invention, the convex portion of each annular plate is located in the recess of the annular plate adjacent to the annular plate, and the flat portion of one end surface of each annular plate is adjacent to the annular plate. As long as it is in contact with the flat portion of the other end surface of the annular plate and the lubricant is disposed in the concave portion of each annular plate, the one end surface and the other end surface in the axial direction of the annular plate are It does not have to have one of the recesses, may have both the protrusions and the recesses, may have any number of protrusions, and may have any number of recesses Also good.

1 is a schematic cross-sectional view in the axial direction of a railcar axle device according to a first embodiment of the present invention. It is a perspective view which shows the some cyclic | annular shim piled up. It is an expansion schematic cross section which shows the periphery of the inner ring | wheel, the rear cover, and the some cyclic | annular shim which were piled up of the axle apparatus for rail vehicles of 2nd Embodiment of this invention. It is sectional drawing of the axial direction of the shim which shows a shim in detail. It is a figure which shows the several shim of the axle apparatus for rail vehicles of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle 2 Double row tapered roller bearing 3,103 Rear cover 4 Oil drain 6 First inner ring 7,107 Second inner ring 8 Outer ring 9 Shaft box 10 First tapered roller 11 Second tapered roller 50,151 Shim 153,156 Flat part 154 Convex 157 Concave 159 Grease

Claims (2)

The axle of the railway vehicle,
The axle box,
An inner ring fitted to the outer peripheral surface of the axle;
An outer ring fitted to the inner peripheral surface of the axle box;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring,
An annular positioning member that is disposed on the outer peripheral surface of the axle and that positions the inner ring in the axial direction with respect to the axle;
A plurality of annular plates sandwiched between the axial end face of the inner ring and the axial end face of the positioning member and overlaid in the axial direction;
A railcar axle device characterized in that a lubricant is applied to one and the other end surfaces in the axial direction of the annular plates. The railcar axle device according to claim 1,
One end surface in the axial direction of each annular plate has a flat portion and a convex portion projecting outward in the axial direction from the flat portion, while the other end surface in the axial direction of each annular plate is a flat portion. And a concave portion recessed inward in the axial direction from the flat portion,
The convex portion of each annular plate is located in the concave portion of the annular plate adjacent to the annular plate,
The flat portion of the one end surface of each annular plate is in contact with the flat portion of the other end surface of the annular plate adjacent to the annular plate,
A railcar axle device, wherein a lubricant is disposed in the recess of each annular plate.

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