JP2010180983A - Sealing structure and bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure and a bearing device that are convenient for use in the case that a lid member is easy to be attached and detached and in which the lid member hardly falls off even after a long time use. <P>SOLUTION: Two grooves are formed at the outer end with respect to the axial direction of the inner circumference surface of an oil shield 4 that is stationary relative to the axle with an interval therebetween along the circumferential direction. The lid member 50 has an annular portion 70 and a sealing portion 71 for sealing one opening that opens in the axial direction of the annular portion 70. The annular portion 70 has two projections 72 formed with an interval therebetween along the circumferential direction. The lid member 50 is engaged with and fixed to the oil shield 4 by fitting the projections 72 of the lid member 50 to the grooves 62 of the oil shield 4 and making them engaged with each other. <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 FIG. 3 of Japanese Utility Model Laid-Open No. 5-25023 (Patent Document 1).

  The sealing structure includes a shaft member, a cylindrical member, and a synthetic rubber lid member (cap), and an inner peripheral surface of the cylindrical member is in contact with an outer peripheral surface of the shaft member; And a second portion positioned at a radial interval with respect to the 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 convex portion, and the annular convex portion protrudes radially inward from the second portion of the cylindrical member. The said annular convex part is located at intervals with respect to the shaft member.

  The lid member includes an annular portion and a sealing portion. The sealing portion exists only on one side in the axial direction of the annular portion, and only the other side in the axial direction of the annular portion is open. The other end portion in the axial direction of the annular portion (hereinafter referred to as the other end portion) is located between the shaft member and the second portion. The other side end is located at a distance from the shaft member.

  The said other side edge part is being fixed to the internal peripheral surface of the 2nd part of the said cylindrical member. The outer peripheral surface of the other side end has an annular groove. The lid member is fixed to the tubular member by fitting and engaging the annular convex portion of the tubular member in the annular groove.

  Since this sealing structure is configured to engage and engage the annular protrusion protruding from the inner peripheral surface of the cylindrical member in the annular groove on the outer peripheral surface of the lid member, it is elastic when the shaft member rotates during operation. The rich lid member rotates in synchronism with the shaft member and bulges outward in the radial direction by centrifugal force, so that the engagement between the tubular member and the lid member is ensured.

Japanese Utility Model Publication No. 5-25023 (Fig. 3)

  The conventional sealing structure has an advantage that when the shaft member rotates during operation, the tubular member and the lid member are surely engaged with each other. On the other hand, the thickness control of the annular convex portion of the tubular member is performed. In addition, there is a problem that the dimensional management of the depth of the annular groove of the annular portion of the lid member becomes severe.

  That is, since the conventional sealing structure is configured such that the outer peripheral surface of the lid member is fixed to the inner peripheral surface of the cylindrical member, when the lid member is removed from the cylindrical member, the inner peripheral surface of the lid member is the shaft member or Compared with the structure fixed to the outer peripheral surface of a cylindrical member, a jig | tool becomes difficult to contact and it becomes difficult to use a jig | tool.

  Therefore, when the thickness of the annular convex portion of the cylindrical member and the depth of the annular groove of the annular portion of the lid member are set larger than the desired thickness and the depth of the annular groove, the lid member from the cylindrical member It becomes extremely difficult to remove the lid member, it becomes difficult to attach and detach the lid member from the cylindrical member, and maintenance becomes difficult to perform, resulting in poor convenience.

  On the other hand, in view of the problem that is difficult to remove, the thickness of the annular convex portion of the cylindrical member and the depth of the annular groove of the annular portion of the lid member are set to the desired thickness and the depth of the annular groove. If set to a small value, the lid member is made of rubber having a great deterioration over time, so that even if a centrifugal force is applied to the lid member during use, the lid member is likely to come off from the tubular member as time passes.

  Accordingly, an object of the present invention is to provide a sealing structure that is easy to attach and detach the lid member, is excellent in convenience, and is difficult to remove the lid member even after a long period of use. 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 circumferential surface opposed to the outer circumferential surface in the radial direction;
A lid member fixed to the inner peripheral surface of the cylindrical member,
The inner peripheral surface of the cylindrical member has a plurality of engaging portions positioned at intervals in the circumferential direction,
The lid member is
It consists of an elastic material, and has an annular part and a sealing part that seals an opening on one end side in the axial direction of the annular part,
The outer peripheral surface of the annular portion has a plurality of engaging portions positioned at intervals in the circumferential direction,
The engaging portion of the cylindrical member is engaged with the engaging portion of the lid member.

  The cylinder member may be a member that is stationary with respect to the shaft member (for example, a member that rotates synchronously with the shaft member when the shaft member is a rotating shaft). A relatively rotating member (for example, a housing or an outer ring of a bearing that does not rotate synchronously with the rotating shaft when the shaft member is a rotating shaft) may be used. Moreover, the said cylinder member may be comprised with the member which is stationary with respect to the shaft member, and the member which rotates relatively with respect to a shaft member.

  Further, for example, the engaging portion of the cylindrical member can be configured by a concave portion, and the engaging portion of the lid member can be configured by a convex portion (projecting portion). On the contrary, the engaging portion of the cylindrical member can be constituted by a convex portion (projecting portion), and the engaging portion of the lid member can be constituted by a concave portion.

  According to the present invention, unlike the conventional example, the cylindrical member is engaged with the engaging portion of the inner peripheral surface of the cylindrical member, and is not an annular engaging portion, but is discrete at intervals in the circumferential direction of the lid member. Therefore, when the engaging part of the cylindrical member or the lid member is formed of a convex part or a concave part, the thickness of the convex part and the depth of the concave part are set to a desired convex part. Even if it is set to be larger than the wall thickness or the depth of the recess, it is not extremely difficult to remove the lid member from the cylindrical member, and it is difficult to remove the lid member from the cylindrical member. Never become. Therefore, maintenance is not difficult to perform and convenience is not deteriorated.

  In addition, from this, according to the present invention, compared to the conventional example, the thickness of the convex portion and the depth of the concave portion engaged with the convex portion are set to the desired thickness of the convex portion or the desired concave portion. Therefore, it is not necessary to strictly manage the dimensions of the protrusions and the depths of the recesses.

  In addition, from this, according to the present invention, the thickness of the convex portion and the depth of the concave portion can be set larger than the thickness of the desired convex portion and the desired concave portion, Even after a long period of use has elapsed, the lid member does not easily come off from the inner peripheral surface of the cylindrical member.

In one embodiment,
The annular part is
A thin portion positioned at intervals in the circumferential direction with respect to the plurality of engaging portions of the lid member;
The thin-walled portion is adjacent to the thin-walled portion in the circumferential direction, and has a thick-walled portion that is thicker in the radial direction than the radial thickness of the thin-walled portion.

  According to the above-described embodiment, the annular portion has the thin portion positioned at intervals in the circumferential direction with respect to the plurality of engaging portions of the lid member, and the strength of the annular portion is reduced. The annular portion is easily deformed inward in the radial direction. Therefore, it becomes easier to attach and detach the lid member from the cylindrical member, and the convenience is further improved. In addition, since it becomes easier to attach and detach the lid member from the cylindrical member, when the engaging portion of the cylindrical member or the lid member is constituted by a convex portion or a concave portion, the dimension of the convex portion or the depth of the concave portion is determined. The variation range of the step setting can be further increased, the convenience can be further improved, and the productivity of the sealing structure can be improved.

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

  According to the present invention, since the sealing structure of the present invention is provided, the lid member with the sealing structure can be easily attached and detached. In the sealing structure, the lid member is the shaft member even after a long period of use has elapsed. Or it does not come off easily from the cylindrical member.

  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. Further, after a long period of use has elapsed, the lid member does not easily come off from the shaft member or the cylindrical member.

It is sectional drawing of the axial direction of the axle apparatus for railway vehicles of one 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 an expansion schematic cross section of the engaging part with an oil drain and a lid member. It is AA sectional view taken on the line of FIG.

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

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

  This railcar axle device includes a railcar axle 1, an axle box (not shown), a double-row cylindrical roller bearing 2, an annular rear lid 3, an oil drain 4, a female screw member 5, and a lid member 50. Is provided. The axle 1 and the female screw member 5 constitute a shaft member.

  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 2 includes 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 axle box, the oil drainer 4 and the outer ring 8 constitute a cylindrical member. In other words, the outer ring 8 is included in the cylindrical member. Moreover, the said axle shaft 1, the said axle box, the oil drain 4, the outer ring | wheel 8, and the cover member 50 comprise the sealing structure.

  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. An end portion located on one side in the axial direction on the inner peripheral surface of the oil drainer 4 is located at a distance from the axle 1.

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

  As shown in FIG. 1, the end portion located on one side in the axial direction on the inner peripheral surface of the oil drainer 4 is a portion located on one side in the axial direction (the outer side in the axial direction) with respect to the female screw member 5. have. The end portion located on one side in the axial direction on the inner peripheral surface of the oil drainer 4 is located at a distance from the female screw member 5.

  The said cover member 50 is being fixed to the edge part located in the one side of an axial direction in the internal peripheral surface of the oil drain 4 which is an internal peripheral surface of a cylinder 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 end portion 60 located on one side in the axial direction on the inner peripheral surface of the oil drainer 4 has a cylindrical inner peripheral surface. Further, the end portion 60 of the oil drainer 4 has two concave portions 62 as an example of an engaging portion. Each said recessed part 62 is connected with the cylindrical internal peripheral surface of the edge part 60, and the two recessed parts 62 are located in the circumferential direction at intervals. Each of the concave portions 62 has a substantially rectangular shape in cross section in the axial direction. Each of the recesses 62 extends in a predetermined dimension in the circumferential direction. One recess 62 and the other recess 62 have substantially the same shape.

  The lid member 50 is an integral member having a lid shape, and is made of synthetic rubber as an example of an elastic material. The lid member 50 has an annular portion 70 and a sealing portion 71, and the annular portion 70 has two convex portions 72 as engaging portions. The sealing part 71 seals the opening of one end side in the axial direction of the annular part 70 (the side opposite to the female screw member 5 side in the axial direction) without any gap.

  The annular portion 70 has a cylindrical outer peripheral surface. Each of the convex portions 72 protrudes outward in the radial direction from the cylindrical outer peripheral surface of the annular portion 70. The two convex portions 72 are located at intervals in the circumferential direction. The convex portion 72 has a shape corresponding to the shape of the concave portion 62 and is slightly smaller than the shape of the concave portion 62. Each of the convex portions 72 is fitted into the concave portion 62 and engaged with the concave portion 62.

  The lid member 50 has an annular flange-like lid stopper 75, and this lid stopper 75 projects radially from the end of the outer peripheral surface of the annular portion 70 on the sealing portion 71 side in the axial direction. . The lid member 50 is pressed and moved in the axial direction toward the female screw member 5 side until the lid stopper 75 comes into contact with the end face 77 on one side of the oil drain 4 in the axial direction, so that the lid member 50 is moved to the oil drain 4. To be engaged. In a state where the lid member 50 is engaged with the oil drain 4, each convex portion 72 is engaged with the concave portion 62.

  FIG. 3 is a schematic cross-sectional view of the lid member 50 and a part of the oil drainer 4. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and is a schematic cross-sectional view in the radial direction of the lid member 50 and a part of the oil drainer 4.

  As shown in FIGS. 3 and 4, one convex portion 72 and the other convex portion 72 face each other in a substantially radial direction. As shown in FIG. 4, the annular portion 70 of the lid member 50 has two thick portions 90 and two thin portions 91. The thickness of the thin portion 91 in the radial direction is thinner than the thickness of the thick portion 90 in the radial direction. One thin portion 91 is present in the circumferential direction of the annular portion 70 where the phase is shifted by π / 2 [rad] with respect to the convex portion 72. One thin portion 91 and the other thin portion 91 are opposed to each other in a substantially radial direction.

  Moreover, each thick part 90 has connected the two thin parts 91 in the circumferential direction, and one thick part 90 and the other thick part 90 are facing substantially radial direction. The two thick portions 90 are substantially the same, and the two thin portions 91 are substantially the same. Each said thin part 91 consists of a part of substantially cylindrical member.

  According to the sealing structure of the above-described embodiment, unlike the conventional example, the lid member 50 is inserted into the concave portion 62 on the inner peripheral surface of the oil drain 4 (part of the cylindrical member) instead of the annular convex portion. Since the plurality of convex portions 72 are discretely positioned at intervals in the circumferential direction, the depth of the concave portion 62 of the oil drain 4 and the thickness of the convex portion 72 of the annular portion 70 of the lid member 50 are set to a desired value. Even if it is a case where it sets large with respect to the thickness of a convex part or the depth of a recessed part, the removal of the cover member 50 from the oil drain 4 does not become extremely difficult, and the lid from the oil drain 4 The member 50 is not difficult to attach and detach. Therefore, maintenance is not difficult to perform and convenience is not deteriorated.

  Also, from this, according to this embodiment, compared to the conventional example, the thickness of the convex portion 72 of the lid member 50 and the depth of the concave portion 62 of the oil drainer 4 are set to the desired thickness of the convex portion. It is possible to increase the depth of the concave portion, and it is not necessary to manage the size of the convex portion 72 and the depth of the concave portion 62 severely.

  Further, from this, according to this embodiment, the thickness of the convex portion 72 of the lid member 50 and the depth of the concave portion 62 of the oil drainer 4 are set to the thickness of the desired convex portion and the desired depth of the concave portion. The lid member 50 is not easily detached from the inner peripheral surface of the oil drainer 4 even after a long period of use has elapsed.

  Further, according to the sealing structure of the above embodiment, the annular portion 70 of the lid member 50 has the thin portion 91 that is positioned in the circumferential direction with respect to the two convex portions 72. Since the strength is reduced, the annular portion 70 is easily deformed inward in the radial direction. Therefore, it becomes easier to attach and detach the lid member 50 from the oil drainer 4 and the convenience is further improved. Further, since the lid member 50 can be more easily attached to and detached from the oil drainer 4, it is possible to further increase the variation range of the step size of the convex portion 72 and the depth of the concave portion 62. It is possible to further improve the performance and to improve the productivity of the sealing structure.

  In the sealing structure of the above embodiment, the lid member 50 is made of synthetic rubber. However, in the present invention, the main body of the lid member may be made of natural resin, synthetic resin, or natural rubber. It may be made of a highly elastic material.

  In the sealing structure of the above embodiment, two convex portions 72 are provided at equal intervals in the circumferential direction. However, in the present invention, three or more convex portions may be provided at equal intervals in the circumferential direction. Two or more parts may be provided at intervals that are not equally spaced in the circumferential direction.

  In the sealing structure of the above embodiment, two recesses 62 are provided at equal intervals in the circumferential direction. However, in the present invention, three or more recesses may be provided at equal intervals in the circumferential direction. Two or more may be provided at intervals that are not equally spaced in the circumferential direction.

  Moreover, in the sealing structure of the said embodiment, all the 2 convex parts 72 were substantially the same, and the two recessed parts 62 were substantially the same, but in this invention, among several convex parts and several recessed parts, At least one of these may not have the same shape.

  In the sealing structure of the above embodiment, the number of convex portions 72 and the number of concave portions 62 are the same. However, in the present invention, the number of convex portions and the number of concave portions are the same even if they are the same. Either is not necessary. For example, when the number of concave portions is larger than the number of convex portions, there may be concave portions in which the convex portions are not fitted during engagement. On the other hand, when the number of convex portions is larger than the number of concave portions, it goes without saying that there is at least one concave portion into which a plurality of convex portions are fitted.

  Further, in the sealing structure of the above-described embodiment, the axial cross-sectional shape of the convex portion 72 is substantially rectangular, and the axial cross-sectional shape of the concave portion 62 is substantially rectangular. The shape of the part may be any shape, and the shape of the recess may be any shape. However, in a state where the outer peripheral surface of the annular portion of the lid member is in contact with the inner peripheral surface of the cylindrical member, the region occupied by the convex portion engaging with the concave portion is smaller than the inner region of the concave portion defined by the concave portion. Needless to say, this condition must be satisfied.

  Moreover, in the sealing structure of the said embodiment, although the outer peripheral surface of the annular part 70 of the cover member 50 was fixed to the inner peripheral surface of the oil drain 4 rotated synchronously with the axle 1, in this invention, the annular part of the cover member The outer peripheral surface may be fixed to the inner peripheral surface of the axle box or the inner peripheral surface of the outer ring of the rolling bearing, and the inner peripheral surface of the axle box and the inner peripheral surface of the outer ring may have a plurality of recesses. There may be. In the present invention, the outer peripheral surface of the annular portion of the lid member is fixed to the inner peripheral surface of the annular member fitted and fixed to the inner peripheral surface of the axle box and the inner peripheral surface of the outer ring. Alternatively, the inner peripheral surface of the annular member may have a plurality of recesses.

  Moreover, in the sealing structure of the said embodiment, while the internal peripheral surface of the oil drain 4 which makes a part of cylinder member has the recessed part 62 as an engaging part, the outer peripheral surface of the annular part 70 of the cover member 50 is a recessed part. In this invention, the inner peripheral surface of the cylindrical member has the convex portion as the engaging portion and the outer periphery of the annular portion of the lid member. The surface may have a concave portion as an engaging portion that engages with the convex portion of the cylindrical member.

  In the bearing device of the above 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 one or more 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.

  The sealing structure of the above embodiment forms part of the railcar axle device, but the sealing structure of the present invention can be applied to any device as long as it is necessary to cover the end of the shaft member. Needless to say. 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 Axle 2 Double row cylindrical roller bearing 4 Oil drain 5 Female thread member 6 Inner ring 8 Outer ring 10 1st cylindrical roller 11 2nd cylindrical roller 50 Lid member 62 Recess 70 Annular part 71 Sealing part 72 Convex part 90 Thick part 91 Thin part

Claims (3)

A shaft member having an outer peripheral surface;
A cylindrical member having an inner circumferential surface opposed to the outer circumferential surface in the radial direction;
A lid member fixed to the inner peripheral surface of the cylindrical member,
The inner peripheral surface of the cylindrical member has a plurality of engaging portions positioned at intervals in the circumferential direction,
The lid member is
It consists of an elastic material, and has an annular part and a sealing part that seals an opening on one end side in the axial direction of the annular part,
The outer peripheral surface of the annular portion has a plurality of engaging portions positioned at intervals in the circumferential direction,
The sealing structure according to claim 1, wherein the engaging portion of the cylindrical member is engaged with the engaging portion of the lid member. The sealing structure according to claim 1,
The annular part is
A thin portion positioned at intervals in the circumferential direction with respect to the plurality of engaging portions of the lid member;
A sealing structure characterized by having a thick portion adjacent to the thin portion in the circumferential direction and having a thicker radial thickness than a radial thickness of the thin portion. The sealing structure according to claim 1 or 2,
The cylindrical member has an outer ring,
An inner ring fixed to the shaft member;
A bearing device comprising: a plurality of rolling elements disposed between the outer ring and the inner ring.

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