JP2010180954A - Sealing structure and bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure which makes a lid member easily attachable and detachable, which is excellent in convenience property, whose secular change is small, and which makes it hard for the lid member to detach, and to provide a bearing device having the sealing structure. <P>SOLUTION: Male threads 64 are formed on the outside circumferential surface of an oil thrower 4, which is stationary to an axle 1. Female threads 80 are formed on the inside circumferential surface of a cylindrical portion 70 of the lid member 50 made of a synthetic resin. These female threads 80 are screwed into the male threads 64. Annular grooves 81, 82 are formed on a portion overlapping the male threads 64 in the radial direction on the outside circumference of the cylindrical portion 70. Annular spring members 86, 87 are arranged on the annular grooves 81, 82. The cylindrical portion 70 is urged inward in the radial direction to the oil thrower 4 side by the annular spring member 86, 87. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing structure, and more particularly to a sealing structure suitable for use in an axle device for a railway vehicle. The present invention also relates to a bearing device including a sealing structure and a rolling bearing, and more particularly to a bearing device suitable for use in an axle device of a railway vehicle.

  Conventionally, there is a sealing structure described in Japanese Utility Model Laid-Open No. 1-80569 (Patent Document 1).

  This sealing structure forms part of the axle device of the railway vehicle. This sealing structure includes a shaft member, a cylindrical member, and a lid member (cap) made of synthetic resin, and an inner peripheral surface of the cylindrical member is in contact with an outer peripheral surface of the shaft member. The cylindrical member rotates synchronously with the shaft member and is stationary with respect to the shaft member. The cylindrical member has an annular protrusion, and the annular protrusion protrudes outward in the radial direction from the outer peripheral surface of the cylindrical member. On the other hand, the lid member is fixed by being fitted onto the outer peripheral surface of the cylindrical member. The inner peripheral surface of the lid member has an annular groove. The lid member is engaged with and fixed to the cylindrical member by engaging the annular protrusion with the annular groove.

  In the above conventional sealing structure, the lid member is formed of an elastic synthetic resin, so that the lid member can be easily attached to and detached from the cylindrical member, and various parts of the axle device can be easily maintained. I am doing so.

Japanese Utility Model Publication No. 1-80569 (FIG. 1)

  In the above conventional sealing structure, since the lid member is made of an elastic synthetic resin, the lid member can be easily attached and detached and maintenance can be easily performed, while the degree of aging of the lid member is large, The lid member is likely to come off with the passage of time.

  In particular, in the configuration in which the lid member rotates in synchronization with the shaft member as in the above-described conventional sealing structure, the lid member is constantly subjected to centrifugal force, the secular change is increased, and the lid member is further detached. It becomes easy.

  On the other hand, in order to avoid the problem that the lid member is easily detached, if the lid member is formed of a metal having high rigidity and small secular change, the lid member can be made difficult to come off, and the lid member is difficult to attach and detach. As a result, maintenance of various parts of the axle device becomes difficult to perform, and convenience is deteriorated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sealing structure that is easy to attach and detach a lid member, is excellent in convenience, has little secular change, and is difficult to remove the lid member. Moreover, the subject of this invention is related with the bearing apparatus which has such a sealing structure.

In order to solve this problem, the sealing structure of the present invention is:
A shaft member having an outer peripheral surface;
A cylindrical member having an inner peripheral surface radially facing the outer peripheral surface, and an outer peripheral surface;
A lid member fixed to one outer peripheral surface of the outer peripheral surface of the shaft member and the outer peripheral surface of the cylindrical member;
An annular or substantially annular compression member,
The one outer peripheral surface has a male screw portion,
The lid member is made of an elastic material, and has a cylindrical portion and a sealing portion that seals an opening on one end side in the axial direction of the cylindrical portion, and the other end side in the axial direction is open,
The inner peripheral surface of the cylindrical portion has a female screw portion, and the female screw portion is screwed to the male screw portion, while the outer peripheral surface of the cylindrical portion is positioned so as to overlap the female screw portion in the radial direction. Has an annular groove,
The tension member is arranged in the annular groove and biases the cylindrical portion inward in the radial direction.

  Examples of the elastic material include a resin material (including both natural and synthetic materials) and a rubber material.

  The annular or substantially annular pressing member includes, for example, an annular spring, an O-shaped rubber ring, a C-shaped clip, and the like.

  According to the present invention, the internal thread portion of the inner peripheral surface of the cylindrical portion of the lid member is screwed into the external thread portion of one of the outer peripheral surface of the shaft member and the outer peripheral surface of the cylindrical member. Therefore, it becomes difficult for the lid member to come off from the shaft member or the cylindrical member.

  Further, according to the present invention, the lid member is biased inward in the radial direction by the compression member, and therefore, the flank surface of the female screw portion of the lid member is biased to the flank surface of the male screw portion of one outer peripheral surface. Can do. Therefore, the friction coefficient between the lid member and the shaft member or the cylinder member is increased, and the detachment of the lid member from the shaft member or the cylinder member can be further suppressed. Therefore, even after a long period of use has elapsed, the lid member is not easily detached from the shaft member or the cylindrical member as compared with a lid member made of only an elastic material.

  According to the invention, the internal thread portion of the inner peripheral surface of the cylindrical portion of the lid member is screwed into the external thread portion of one of the outer peripheral surface of the shaft member and the outer peripheral surface of the cylindrical member. In addition, since the tension member biases the lid member toward the one outer peripheral surface, after removing the tension member from the lid member, it is only necessary to release the threaded engagement between the male screw portion and the female screw portion. The lid member can be easily detached from the shaft member or the cylinder member, and the lid member can be easily attached to the shaft member or the cylinder member only by performing the reverse operation. Therefore, the lid member can be easily attached to and detached from the shaft member or the cylindrical member, and the convenience is excellent.

The bearing device of the present invention is
Comprising the sealing structure of the present invention,
The cylindrical member of the sealing structure includes an outer ring,
An inner ring fixed to the outer peripheral surface of the shaft member of the sealing structure;
A plurality of rolling elements disposed between the outer ring and the inner ring are provided.

  According to the present invention, it is easy to attach and detach the lid member, and the convenience is excellent. In addition, after a long period of use, the lid member is not easily detached from the shaft member or the cylindrical member as compared with a lid member made of only an elastic material.

  According to the sealing structure and the bearing device of the present invention, the lid member can be easily attached and detached, and the convenience is excellent. In addition, after a long period of use, the lid member is not easily detached from the shaft member or the cylindrical member as compared with a lid member made of only an elastic material.

It is sectional drawing of the axial direction of the axle apparatus for rail vehicles of 1st Embodiment of the bearing apparatus of this invention. It is an expanded sectional view of the periphery of the internal thread member of FIG. It is a schematic cross section of the axial direction of a part of a railcar axle device according to a second embodiment of the bearing device of the present invention.

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

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

  This railcar axle device includes a railcar axle 1, an axle box (not shown) as an example of a tubular member, a double row cylindrical roller bearing 2, an annular rear lid 3, an oil drain 4, and a female screw member 5. And a lid member 50. The axle 1, the oil drain 4 and the female screw member 5 constitute a shaft member. Further, the axle 1, the axle box, the oil drain 4, the female screw member 5 and the lid member 50 constitute a sealed structure.

  The double-row cylindrical roller bearing 2 supports the axle 1 rotatably with respect to the inner peripheral surface of the axle box. The double row cylindrical roller bearing has an inner ring 6, an outer ring 8, a plurality of first cylindrical rollers 10 as rolling elements, and a plurality of second cylindrical rollers 11 as rolling elements. The inner ring 6 has a first cylindrical raceway surface 21 and a second cylindrical raceway surface 22 that are adjacent to each other in the axial direction on the outer periphery.

  On the other hand, the outer ring 8 has an inner circumferential surface opposed to the outer circumferential surface of the shaft member in the radial direction. The outer ring 8 is fitted and fixed to the inner peripheral surface of the axle box. The outer ring 8 has a first cylindrical raceway surface 31 and a second cylindrical raceway surface 32 that are axially adjacent to each other on the inner periphery. The outer ring 8 has flanges on both sides of the first cylindrical raceway surface 31 in the axial direction, and has flanges on both sides of the second cylindrical raceway surface 32 in the axial direction.

  The plurality of first cylindrical rollers 10 are held in the circumferential direction while being held by the first cage 41 between the first cylindrical raceway surface 21 of the inner ring 6 and the first cylindrical raceway surface 31 of the outer ring 8. They are spaced from each other. The plurality of second cylindrical rollers 11 are held in the second cage 42 between the second cylindrical raceway surface 22 of the inner ring 6 and the second cylindrical raceway surface 32 of the outer ring 8. They are spaced apart from each other in the direction.

  The rear lid 3 is fitted and fixed to the outer peripheral surface of the axle 1. An end surface on one side in the axial direction of the rear lid 3 (the side opposite to the wheel side of the railway vehicle) is in contact with an end surface on the other side in the axial direction of the inner ring 6. On the other hand, the end surface on the other side in the axial direction of the rear lid 3 is in contact with a stepped portion extending in the radial direction of the axle 1. Thus, the rear lid 3 is fixed to a predetermined position of the axle 1 by bringing the rear lid 3 into contact with the step portion of the axle 1.

  The oil drainer 4 is an annular member. The oil drain 4 is located on the side opposite to the axial rear cover 3 side of the double row cylindrical roller bearing 2. The end face on the other side (inner ring 6 side) in the axial direction of the oil drain 4 is in contact with the end face on one side of the inner ring 6. A radially outer portion of the end face on the other axial side of the oil drain 4 abuts on the first cylindrical roller 10.

  The female screw member 5 is screwed into a male screw formed on the outer peripheral surface of the axle 1, and the other axial end surface of the female screw member 5 is in contact with the axial end surface of the oil drain 4. It touches. By adjusting the screwing amount of the female screw member 5, the preload in the axial direction of the double row cylindrical roller bearing 2 is adjusted.

  The said cover member 50 is being fixed to the edge part of the one side of the axial direction of the outer peripheral surface of the oil drain 4 as an example of the outer peripheral surface of a shaft member.

  A cylindrical seal case 37 is attached to the inner peripheral surface of the outer ring 8 in the axial oil drain 4 side, and a cylindrical shape is attached to the inner peripheral surface of the outer ring 8 in the axial direction on the rear lid 3 side. The seal case 38 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 an enlarged cross-sectional view of the periphery of the female screw member 5 of FIG.

  As shown in FIG. 2, the outer peripheral surface of the oil drainer 4 has a male screw portion 64 at an end portion on the lid member 50 side in the axial direction. The lid member 50 is made of a synthetic resin as an example of an elastic material. The lid member 50 includes a cylindrical portion 70 and a sealing portion 71. The sealing portion 71 seals the opening on one side of the cylindrical portion 70 in the axial direction without any gap.

  An inner peripheral surface of the cylindrical portion 70 has a female screw portion 80. The internal thread portion 80 of the cylindrical portion 70 is screwed into the external thread portion 64 of the oil drain 4. On the other hand, the outer peripheral surface of the cylindrical portion 70 has a first annular groove 81 and a second annular groove 82. The first annular groove 81 is located at an axial distance from the second annular groove 82. Each of the first annular groove 81 and the second annular groove 82 is present on the outer peripheral surface of the cylindrical portion 70 at a position overlapping the female screw portion 80 in the radial direction. In the first annular groove 81, a spring member 86 formed in an annular shape as an example of a compression member is disposed, and in the second annular groove 82, a spring member 87 formed in an annular shape as an example of a compression member is disposed. ing. Each of the spring members 86 and 87 urges the cylindrical portion 70 radially inward toward the female thread portion 64 side of the oil drain 4.

  According to the sealing structure of the first embodiment, the internal thread portion 80 of the cylindrical portion 70 of the lid member 50 is screwed into the external thread portion 64 of the outer peripheral surface of the oil drain 4 that forms a part of the shaft member. The lid member 50 is unlikely to be detached from the oil drainer 4.

  Further, according to the sealing structure of the first embodiment, the cylindrical portion 70 of the lid member 50 is urged inward in the radial direction by the spring member 86 formed in an annular shape. The flank surface can be biased to the flank surface of the male threaded portion 64 of the oil drain 4. Therefore, the friction coefficient between the lid member 50 and the oil drainer 4 is increased, and the detachment of the lid member 50 from the oil drainer 4 can be further suppressed. Therefore, even after a long period of use has elapsed, the lid member 50 is not easily detached from the oil drainer 4 (shaft member) as compared with a lid member made of only an elastic material.

  Moreover, according to the sealing structure of the said 1st Embodiment, while the internal thread part 80 of the cylindrical part 70 of the cover member 50 screws together with the external thread part 64 of the outer peripheral surface of the oil drain 4 which makes a part of shaft member, Since the annularly formed spring members 86, 87 are configured to urge the lid member 50 inward in the radial direction, the spring members 86, 87 are removed from the lid member 50, and the male screw portion 64 and the female screw portion 80 are separated. The lid member 50 can be easily detached from the oil drain 4 simply by releasing the screw engagement, and the lid member 50 can be easily attached to the oil drain 4 simply by performing the reverse operation. Therefore, the lid member 50 can be easily attached to and detached from the oil drainer 4 and the convenience is excellent.

  In the sealing structure of the first embodiment, the lid member 50 is made of synthetic resin. However, in this invention, the lid member may be made of natural resin or rubber, and is rich in other elasticity. It may be made of materials.

  In the sealing structure of the first embodiment, the annular grooves 81 and 82 on the outer peripheral surface of the cylindrical portion 70 of the lid member 50 are the spring members 86 and 87 formed in an annular shape. In the invention, the annular groove on the outer peripheral surface of the cylindrical portion of the lid member is a member other than the annular spring member, such as an annular rubber member or a C-shaped clip, and has a diameter over the entire circumference in the circumferential direction. It may be a tension member that can press the inside of the direction.

  Further, in the sealing structure of the first embodiment, two annular grooves 81 and 82 are formed at intervals on the outer peripheral surface of the cylindrical portion 70 of the lid member 50 so as to overlap the female screw portion 80 in the radial direction. The annular spring members 86 and 87 are disposed in the annular grooves 81 and 82, respectively. However, according to the present invention, one or three or more annular grooves are formed in the outer circumferential surface of the cylindrical portion of the lid member so as to overlap the female screw portion in the radial direction and spaced apart from each other in the axial direction. An annular or substantially annular pressing member may be disposed in each of the grooves.

  In the bearing device of the first embodiment, the rolling bearing is the double-row cylindrical roller bearing 2, but in the bearing device of the present invention, the rolling elements are arranged in a single row or a plurality of rows in the axial direction. The rolling element may be a tapered roller, a cylindrical roller, a convex 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.

  FIG. 3 is a schematic sectional view in the axial direction of a part of a railcar axle device according to a second embodiment of the bearing device of the present invention.

  In the second embodiment, the description of the operations and effects common to the first embodiment will be omitted, and only the configurations and operations and effects different from those of the first embodiment will be described.

  In FIG. 3, reference numeral 101 denotes an axle, 104 denotes oil draining, and 105 denotes a female screw member. In FIG. 3, reference numeral 106 denotes an inner ring of a double row cylindrical roller bearing, 108 denotes an outer ring of the double row cylindrical roller bearing, and 110 denotes a first cylindrical roller. The outer ring 108 is fitted and fixed to the inner peripheral surface of a shaft box (not shown).

  In the first embodiment, the lid member 50 is configured to be screwed and fixed to the outer peripheral surface of the oil drain 4 that forms a part of the shaft member. However, in this invention, the cover member may be configured to be screwed and fixed to the outer peripheral surface of the cylindrical member. In the second embodiment, an embodiment will be described in which the lid member 150 is screwed and fixed to the outer peripheral surface of the cylindrical member.

  The bearing device of the second embodiment includes an annular member 120. As shown in FIG. 3, one end portion in the axial direction of the outer peripheral surface of the annular member 120 is fitted and fixed to an end portion 130 on the axial direction lid member 150 side on the inner peripheral surface of the outer ring 108. . The outer peripheral surface of the annular member 120 has a male screw portion at the end of the outer peripheral surface opposite to the axial outer ring 108 side. The male screw portion is screwed into a female screw portion formed on the inner peripheral surface of the cylindrical portion 170 of the lid member 150. Similar to the first embodiment, the outer peripheral surface of the cylindrical portion 170 of the lid member 150 has two annular grooves spaced from each other at a position overlapping the female screw portion in the radial direction. In each of the two annular grooves, an annular rubber member as an example of a pressing member is disposed.

  The axle 101, the oil drain 104 and the female screw member 105 constitute a shaft member. Further, the axle box, the outer ring 108 and the annular member 120 constitute a cylindrical member. The axle 101, the oil drain 104, the female screw member 105, the axle box, the outer ring 108, the annular member 120, and the lid member 150 constitute a sealed structure.

  According to the sealing structure of the second embodiment, since the lid member 150 is screwed and fixed to the cylinder member on the stationary side, the lid member 150 does not rotate with the axle 101, and the lid member 150 is It becomes difficult to come off from the annular member 120.

  In the first and second embodiments, the sealing structure forms part of the railcar axle device. However, the sealing structure of the present invention is a device that needs to cover the end of the shaft member. Needless to say, the present invention may be applied to any apparatus. Further, it goes without saying that the bearing device of the present invention may not be a railcar axle device, and any device having a shaft member, a rolling bearing, and a lid member that covers one end of the shaft member. Needless to say good things.

DESCRIPTION OF SYMBOLS 1,101 Axle 2 Double row cylindrical roller bearing 4,104 Oil drain 5,105 Female thread member 6,106 Inner ring 8,108 Outer ring 10,110 First cylindrical roller 11 Second cylindrical roller 50,150 Lid member 64 Male thread part 70, 170 Cylindrical portion 71,171 Sealing portion 80 Female thread portion 81 First annular groove 82 Second annular groove 86, 87, 186, 187 Annular spring member 120 Annular member

Claims (2)

A shaft member having an outer peripheral surface;
A cylindrical member having an inner peripheral surface radially facing the outer peripheral surface, and an outer peripheral surface;
A lid member fixed to one outer peripheral surface of the outer peripheral surface of the shaft member and the outer peripheral surface of the cylindrical member;
An annular or substantially annular compression member,
The one outer peripheral surface has a male screw portion,
The lid member is made of an elastic material, and has a cylindrical portion and a sealing portion that seals an opening on one end side in the axial direction of the cylindrical portion, and the other end side in the axial direction is open,
The inner peripheral surface of the cylindrical portion has a female screw portion, and the female screw portion is screwed to the male screw portion, while the outer peripheral surface of the cylindrical portion is positioned so as to overlap the female screw portion in the radial direction. Has an annular groove,
The sealing structure, wherein the tension member is disposed in the annular groove and urges the cylindrical portion inward in the radial direction. The sealing structure according to claim 1,
The cylindrical member of the sealing structure includes an outer ring,
An inner ring fixed to the outer peripheral surface of the shaft member of the sealing structure;
A bearing device comprising: a plurality of rolling elements disposed between the outer ring and the inner ring.

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