JP2010121725A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device which hardly undergoes fretting wear on the end surface of an inner ring and the end surface of a positioning member axially opposite to the end surface of the inner ring. <P>SOLUTION: A ball assembly 50 is retained and fixed between the axial end surface 55 of a second inner ring 7 and the annular groove 80 at the axial end of a rear lid 3. The ball assembly 50 is composed of multiple balls 70 arranged circumferentially at equal intervals and a rubber annular ball retaining member 69 for retaining the multiple balls 70. In the ball retaining member 69, a portion of the ball 70 is axially projected from one end surface of the ball retaining member 69, and other portion of the ball 70 is axially projected from the other end surface of the ball retaining member 69. The portion of the ball 70 is brought into contact with the annular groove 80, and the other portion of the ball 70 is brought into contact with the end surface 55 of the second inner ring 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  Since 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, it is known that both ends of the axle are sunk downward and the center is swollen (bending).

  And a railcar axle device including a railcar axle, 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. Under the influence of bending, a minute relative reciprocating sliding motion, that is, fretting, occurs between the axial end surface of the inner ring and the axial end surface of the rear lid that is in contact with the end surface. It is known that they occur and that micro-abrasion occurs on their 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.

  Here, as an axle device for railway vehicles 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, with this measure, it is difficult to sufficiently suppress fretting wear.
JP-A-8-128451 (FIG. 1)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing device in which fretting wear is unlikely to occur on an end face of an inner ring and an end face of a positioning member facing the end face of the inner ring in the axial direction.

In order to solve the above problems, the rolling bearing device of the present invention is
A shaft member;
A housing;
An inner ring fitted to the outer peripheral surface of the shaft member;
An outer ring fitted to the inner peripheral surface of the housing;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring,
An annular positioning member disposed on the outer peripheral surface of the shaft member;
The inner ring is axially positioned with respect to the shaft member in contact with the axial end face of the positioning member and the axial end face of the inner ring, and the end face of the positioning member and the inner ring It is characterized by comprising a plurality of balls that can roll on the end face.

  According to the present invention, a plurality of balls are arranged between the end surface of the inner ring and the end surface of the positioning member, and the contact between the end surface of the inner ring and the ball, and the contact between the end surface of the positioning member and the ball, Since both are in rolling contact, both the end surface on the positioning member side of the inner ring and the end surface on the inner ring side of the positioning member hardly slide with respect to the other members. Therefore, the fretting wear due to the micro slip hardly occurs on both the end face of the inner ring and the end face of the positioning member.

  Further, according to the present invention, since the plurality of balls are arranged between the end surface of the inner ring and the end surface of the positioning member, the relative position of the positioning member with respect to the inner ring can be appropriately and freely varied. Therefore, the bending of the shaft member is easily absorbed by the free fluctuation of the relative position of the positioning member with respect to the inner ring, and the distortion generated in each member of the rolling bearing device can be alleviated. Can be suppressed.

In one embodiment,
At least one of the end surface of the inner ring and the end surface of the positioning member has a substantially arc-shaped annular groove in an axial cross section,
The plurality of balls are in contact with the annular groove,
The radius of curvature of the annular groove in the cross section is larger than the radius of the ball.

  According to the embodiment, at least one of the end face of the inner ring and the end face of the positioning member has the substantially arc-shaped annular groove in the axial cross section, thereby preventing the positional deviation of the ball. it can.

  Further, according to the above embodiment, since the radius of curvature of the annular groove in the cross-sectional view is larger than the radius of the ball, when bending occurs in the shaft member, the ball smoothly moves in the radial direction in the annular groove. Roll and move. Therefore, it can suppress that a ball | bowl slips on the end surface of an inner ring | wheel or the end surface of a positioning member, and also can suppress further that fretting wear arises on the end surface of an inner ring | wheel or a positioning member.

In one embodiment,
An annular holding member made of a material that can hold the plurality of balls and can be elastically deformed is provided.

  The material that can be elastically deformed includes rubber and resin.

  According to the embodiment, since the plurality of balls are held and the annular holding member made of a material that can be elastically deformed is provided, the ball can be prevented from approaching one side in the radial direction, and The inner ring can be reliably positioned in the axial direction with respect to the shaft member.

  Further, according to the above embodiment, since the material of the annular holding member that holds the plurality of balls can be elastically deformed, the bending of the shaft member can be absorbed by the deformation of the holding member. Therefore, distortion generated in each member of the rolling bearing device can be alleviated, and it is possible to suppress each member from causing metal fatigue.

In one embodiment,
The inner ring and the positioning member are made of steel, and the balls are made of ceramic.

  According to the above embodiment, the contact between the ball and the inner ring and the contact between the ball and the positioning member become contact with different members, so that the ball and the inner ring are less likely to adhere, and the ball and the positioning are positioned. It becomes difficult to adhere to the member. Therefore, it is possible to further suppress fretting wear on the end face of the inner ring and the end face of the positioning member.

  According to the rolling bearing device of the present invention, a plurality of balls are arranged between the end surface of the inner ring and the end surface of the positioning member, the contact between the end surface of the inner ring and the ball, and the end surface and ball of the positioning member. Therefore, both the end surface of the inner ring and the end surface of the positioning member hardly slide with respect to the other members. Therefore, the fretting wear due to the micro slip hardly occurs on both the end face of the inner ring and the end face of the positioning member.

  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 an embodiment of the rolling bearing device of the present invention.

  This railcar axle device constitutes a part of the railcar. This railcar axle device includes an axle 1, a shaft box 9, a double-row tapered roller bearing 2 as an example of a rolling bearing, a rear lid 3 as an example of a positioning member, an oil drainer 4, and a ball assembly 50. With.

  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 first and second inner rings 6 and 7, the outer ring 8, and the first and second tapered rollers 10 and 11 are made of bearing steel such as SUJ2 (high carbon chromium bearing steel).

  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 made of a steel material such as S45C or S55C. The rear lid 3 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 end of the rear lid 3 on the second inner ring 7 side in the axial direction has an annular recess 60 that opens radially inward and outward in the axial direction. The bottom surface of the recess 60 is opposed to the axial end surface 55 of the second inner ring 7 in the axial direction. The bottom surface of the recess 60 coincides with the end surface of the rear lid 3 on the second inner ring 7 side in the axial direction.

  The oil drain 4 is an annular member made of a steel material such as S45C or S55C. The oil drain 4 is located on the side opposite to the rear lid 3 side of the double row tapered roller bearing 2. The end face on one side of the oil drain 4 in the axial direction is opposed to the end face of the first inner ring 6 opposite to the second inner ring 7 in the axial direction.

  The ball assembly 50 is an annular member. The ball assembly 50 is sandwiched and fixed between the bottom surface of the recess 60 and the axial end surface 55 of the second inner ring 7.

  Specifically, 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 and the ball assembly 50 are sandwiched between the oil drain 4 and the rear lid 3 to apply axial preload to the double row tapered roller bearing 2 and the ball assembly 50, thereby Positioned in the axial direction.

  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.

  FIG. 2 is a perspective view of the ball assembly 50.

  The ball assembly 50 includes a rubber ball holding member 69 and a plurality of ceramic balls 70. The ball holding member 69 is an annular member, and both end surfaces in the axial direction are expanded in the radial direction. The ball holding member 69 has a plurality of identical through holes. The plurality of through holes are arranged at the same interval in the circumferential direction, and each through hole extends in the axial direction. The inner surface of the through hole has a shape consisting of a part of a substantially spherical surface.

  The ball 70 is accommodated in the through hole. As shown in FIG. 2, a part of each ball 70 protrudes in the axial direction from one end face of the ball holding member 69, and the other part of each ball 70 is pivoted from the other end face of the ball holding member 69. Protrudes in the direction. In each of the balls 70, the partial shape of the ball 70 and the other partial shape of the ball 70 are substantially the same.

  The inner surface of the through hole and the outer surface of the ball 70 have a gap that does not hinder the minute rolling of the ball 70 against the elastic deformation of the ball holding member 69 due to the bending of the shaft member 1 (see FIG. 1). Facing the radial direction of the ball 70.

  FIG. 3 is a schematic enlarged sectional view in the axial direction around the ball assembly 50 of the railcar axle device.

  As shown in FIG. 3, the bottom surface 79 of the concave portion 60 of the rear lid 3 has an arc-shaped annular groove 80 in the axial cross section. The radius of curvature of the annular groove 80 in the cross section is larger than the radius of the ball 70. The balls 70 are in contact with the annular groove 80 and the end surface 55 of the second inner ring 7.

  In the above configuration, when the rear cover 3 moves in the radial direction in the direction indicated by the arrow A due to the bending of the shaft member 1, the ball 70 rolls in the direction indicated by the arrow B with respect to the annular groove 80 of the recess 60. At the same time, it rolls in the direction indicated by the arrow C with respect to the end face 55 of the second inner ring 7. That is, when the bending of the shaft member 1 occurs, the balls 70 are appropriately moved on the annular groove 80 as appropriate. In this manner, the positional deviation of the ball 70 is prevented, and the distortion generated in each member of the railcar axle device due to the bending of the shaft member 1 is alleviated.

  According to the railcar axle device of the above embodiment, the plurality of balls 70 are arranged between the end surface 55 of the second inner ring 7 and the end surface of the rear lid 3 (more precisely, the annular groove 80 of the recess 60). Since the contact between the end surface 55 of the second inner ring 7 and the ball 70 and the contact between the end surface of the rear lid 3 and the ball 70 are both rolling contact, the end surface 55 of the second inner ring 7 and the rear Both of the end faces of the lid 3 hardly slip with respect to the other members. Therefore, the fretting wear due to the micro slip hardly occurs on both the end surface 55 on the rear lid 3 side of the second inner ring 7 and the end surface on the second inner ring 7 side of the rear lid 3.

  Further, according to the railcar axle device of the above embodiment, the plurality of balls 70 are disposed between the end surface 55 of the second inner ring 7 and the end surface of the rear lid 3, so that the rear with respect to the second inner ring 7 is arranged. The relative position of the lid 3 can be appropriately and freely varied. Therefore, the bending of the shaft member 1 is easily absorbed by the free fluctuation of the relative position of the rear lid 3 with respect to the second inner ring 7, so that the distortion generated in each member of the railcar axle device can be reduced. It is possible to suppress the above-mentioned members from causing metal fatigue.

  Further, according to the railcar axle device of the above embodiment, the end surface of the rear lid 3 on the second inner ring 7 side in the axial direction has the substantially circular arc-shaped groove 80 in the axial cross section. The positional deviation of the ball 70 can be prevented.

  Further, according to the railcar axle device of the above embodiment, since the radius of curvature of the annular groove 80 in the cross-sectional view is larger than the radius of the ball 70, when bending occurs in the shaft member 1, the ball 70. Can smoothly roll and move in the radial direction in the annular groove 80. Therefore, the ball 70 can be prevented from sliding on the end surface 55 of the second inner ring 7 and the end surface of the rear lid 3, and further, fretting wear is caused on the end surface 55 of the second inner ring 7 and the end surface of the rear lid 3. This can be further suppressed.

  Further, according to the railcar axle device of the above embodiment, the ball 70 is provided with the annular holding member 69 made of a rubber material that holds the plurality of balls 70 and is elastically deformable. The second inner ring 7 can be reliably positioned in the axial direction with respect to the shaft member 1 because it can be prevented from approaching to one side. Further, since the material of the annular holding member 69 that holds the plurality of balls 70 can be elastically deformed, the bending of the shaft member 1 is easily absorbed by the deformation of the holding member 69. Therefore, distortion generated in each member of the railcar axle device can be alleviated, and each member can be prevented from causing metal fatigue.

  Further, according to the railcar axle device of the embodiment, the second inner ring 7 and the rear cover 3 are made of steel, and the balls 70 are made of ceramic. Therefore, since the contact between the ball 70 and the second inner ring 7 and the contact between the ball 70 and the rear lid 3 are contact with different members, the ball 70 and the second inner ring 7 are less likely to adhere to each other. Moreover, the ball 70 and the rear lid 3 are less likely to adhere to each other. Therefore, it is possible to further suppress the occurrence of fretting wear on the end surface 55 on the rear lid 3 side of the second inner ring 7 and the end surface of the rear lid 3 on the second inner ring 7 side.

  In the railcar axle device of the above embodiment, the plurality of balls 70 are held by the ball holding member 69. However, in the present invention, the ball holding member is omitted and the plurality of balls 70 are directly connected to the end face of the inner ring. And the end face of the positioning member.

  Further, in the railway vehicle axle device of the above embodiment, the annular groove 80 is provided on the end surface of the rear lid 3 (corresponding to the bottom surface 79 of the recess 60) while the annular groove is not provided on the end surface 55 of the second inner ring 7. The ball 70 is brought into contact with the end surface 55 of the second inner ring 7 and the annular groove 80 of the rear lid 3. However, in the present invention, the annular groove is not provided on the end surface of the positioning member, while the annular groove is provided on the end surface of the inner ring so that the ball contacts the annular groove of the inner ring and the end surface of the positioning member. . In the present invention, an annular groove may be provided on the end face of the positioning member, and an annular groove may be provided on the end face of the inner ring so that the ball contacts the annular groove of the inner ring and the annular groove of the positioning member. .

  Further, in the railcar axle device of the above embodiment, the ball assembly 50 is configured by the ball holder 69 and the plurality of balls 70 that can move relative to the ball holder 69. The assembly may be composed of a ball cage and a plurality of balls that cannot move relative to the ball cage. For example, a configuration in which a plurality of balls are fixed to a rubber ball cage without gaps. There may be.

  Further, in the railcar axle device of the above embodiment, the ball cage 69 is made of rubber and the ball 70 is made of ceramic. However, in this invention, the ball cage may be made of resin, The ball may be made of steel.

  In the railcar axle device of the above embodiment, the plurality of balls 70 are arranged at equal intervals in the circumferential direction. However, in the present invention, the plurality of balls may not be arranged at equal intervals in the circumferential direction.

  In the rolling stock axle device of the above embodiment, the rolling bearing is the double-row tapered roller bearing 2, but in the present invention, in the rolling bearing, the rolling elements are arranged in one or more rows in the axial direction. The rolling element may be a tapered roller, a cylindrical roller, or a combination of a tapered roller 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 of the above embodiment, the positioning member is the rear lid 3 positioned on the wheel side relative to the inner rings 6 and 7, but in this invention, the positioning member is on the wheel side with respect to the inner ring. It may be an oil drainer located on the opposite side. The ball assembly may not be disposed between the inner ring and the rear lid, while the ball assembly 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. The ball assembly may be disposed between the inner ring and the rear lid, and the ball assembly may be disposed between the inner ring and the oil drainer.

  In the above embodiment, the rolling bearing device is an axle device for a railway vehicle. However, the rolling bearing device of the present invention is, for example, various rolling bearing devices used in a continuous casting machine or a rolling device. Alternatively, any device other than the railcar axle device in which the shaft member is excessively or heavily loaded and the rolling bearing and the positioning member are present may be used.

1 is a schematic cross-sectional view in the axial direction of a railcar axle device according to an embodiment of the rolling bearing device of the present invention. FIG. 6 is a perspective view of a ball assembly. It is a model expanded sectional view of the axial direction of the periphery of the ball | bowl assembly of the axle apparatus for rail vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle 2 Double row tapered roller bearing 3 Rear cover 4 Oil drain 6 First inner ring 7 Second inner ring 8 Outer ring 9 Shaft box 10 First tapered roller 11 Second tapered roller 50 Ball assembly 55 End face 60 of second inner ring in the axial direction 60 Recessed portion of rear cover 69 Ball holding member 70 Ball 79 Bottom surface of recessed portion of rear cover 80 Annular groove

Claims (2)

A shaft member;
A housing;
An inner ring fitted to the outer peripheral surface of the shaft member;
An outer ring fitted to the inner peripheral surface of the housing;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring,
An annular positioning member disposed on the outer peripheral surface of the shaft member;
The inner ring is axially positioned with respect to the shaft member in contact with the axial end face of the positioning member and the axial end face of the inner ring, and the end face of the positioning member and the inner ring A rolling bearing device comprising a plurality of balls capable of rolling on an end surface. The rolling bearing device according to claim 1,
At least one of the end surface of the inner ring and the end surface of the positioning member has a substantially arc-shaped annular groove in an axial cross section,
The plurality of balls are in contact with the annular groove,
A rolling bearing device, wherein a radius of curvature of the annular groove in the cross section is larger than a radius of the ball.

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