JP2001116055A - Double row conical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain an excellent lubricating state over a long period by preventing the intrusion of abrasion powder generated by a contact part of an inner race and a rear cover inside a bearing, to facilitate manufacture, and to easily disassemble a seal member. SOLUTION: The inner race 4 is extended in the width direction more than an outer race 5, and a seal member 8 is slidingly contacted with an outer diameter surface of the inner race extended part 4a. The seal member 8 is installed on the outer race 5 by projecting in the width direction. A rear cover 3 is contacted with a width surface of the inner race extended part 4a. The inner race 4 is formed as a divided type by respectively arranging a pair of divided inner races to rollers of respective rows.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle bearing device used for supporting an axle of a railway vehicle.

[0002]

2. Description of the Related Art Conventionally, in a railway vehicle bearing device, as shown in FIG.
Using an oil drain 56, which is a special part separate from
The oil seal 55 is slidably contacted with the rear cover 6 and the rear cover 57.

[0003] However, the following problem arises with the configuration in which the seal 55 is slidably contacted with the oil drain 56 and the rear lid 57 in this manner. Bending of the axle 60 causes fretting on the sliding contact surface a between the inner ring 51 and the rear lid 57, and abrasion powder due to the fretting may be mixed into the bearing. The sliding surfaces of the seal such as the oil drain 56 and the back lid 57 are hard,
It is expensive because roughness and precision are required. That is,
In order to deal with the hardness, heat treatment of the oil drain 56 and the back lid 57 is required separately from the inner ring 51, so that the cost increases.
Further, in order to obtain the accuracy of the seal sliding contact surface, it is necessary to finish the inner surface and the width surface of the oil drain 56 and the back cover 57 with high accuracy, which increases the cost. Since the number of parts increases due to the oil drain 56, the variation in the assembly width increases, and the variation in the axial position at the time of mounting the bearing also increases.

[0004] As a countermeasure against some of these problems, a part for a rear cover 57 is formed integrally with the inner race 51 and a seal 55 is slidably contacted with the extended part. A bearing device has been proposed.
No. 55371). According to this, no abrasion powder is generated on the contact surface between the inner ring 51 and the back lid 57, and the intrusion of the abrasion powder into the bearing is prevented. However, in the case of the above proposed example, since the inner race 51 and the rear lid 57 are formed as an integral part, machining is difficult. That is, the back lid 5
The portion 7 is required to be formed on the inner surface corresponding to the step or the curved surface of the outer surface of the axle 60, and the shape is complicated. Processing as an integral part with the required inner ring 51
It is considered difficult in practice. In the case of a bearing device in which a seal 55 made of an oil seal or the like is slidably contacted with an extended portion of the inner ring 51, it is difficult to remove the seal 55 during maintenance, and a force is applied to the retainer 54. May be required.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent abrasion powder generated at a contact portion between an inner ring and a rear cover from being mixed into a bearing, maintain a good lubrication state for a long period of time, and be easy to manufacture. It is to provide. Another object of the present invention is to prevent abrasion powder generated at the contact portion between the inner ring and the rear lid from entering the inside of the bearing, maintain a good lubricating state for a long period of time, and to disassemble the seal member when disassembling the seal member. An object of the present invention is to provide a railcar bearing device that can be easily disassembled without applying a force. Still another object of the present invention is to reduce the number of parts. Yet another object of the present invention is to
The inner ring of the bearing can be prevented from being worn by the sliding contact of the seal member, and when the seal function is deteriorated, only the seal member is replaced so that the initial seal performance can be restored. Still another object of the present invention is to suppress the generation of wear powder on the contact surface between the inner ring and the rear lid, and to maintain a good lubrication state for a longer period of time. Still another object of the present invention is to improve assemblability.

[0006]

According to a first aspect of the present invention, there is provided a bearing device for a railway vehicle, comprising a double-row rolling bearing having an inner ring, an outer ring, and a rolling element, wherein the inner ring is mounted on an axle; A rear lid attached to the axle in contact with the width surface opposite to the axle end of the axle, and a seal member attached to the outer ring and protruding in the width direction from the outer ring, the inner ring being wider than the outer ring in the width direction. The sealing member is slid on the outer diameter surface of the inner ring extending portion. According to this configuration, since the seal member attached to the outer ring is in sliding contact with the inner ring, a portion where wear powder is generated due to the contact between the inner ring and the rear lid,
It is located outside the area sealed by the sealing member. Therefore, the abrasion powder generated on the contact surface between the inner ring and the rear lid is prevented from entering the bearing by the seal member, and is not mixed into the bearing, so that a good lubricating state can be maintained for a long time. Since the seal member is in sliding contact with the inner ring extending portion, the raceway surface of the inner ring is not narrowed, and there is no problem of reduction in load capacity. Further, since the rear lid is provided separately from the inner ring, the inner ring only needs to form an inner ring extending portion necessary for sliding contact of the seal, and processing is easy. The processing of the hardness and precision of the seal sliding contact surface of the inner ring can be performed simultaneously with the inner ring extending portion having such a simple shape at the time of manufacturing the inner ring, so that the number of manufacturing steps is reduced and the cost is reduced. In addition, since the rear lid does not need to form the sliding surface of the seal member, it can be easily processed.

According to a second aspect of the present invention, there is provided a railway vehicle bearing device comprising: a double-row rolling bearing having an inner ring, an outer ring, and a rolling element, wherein the inner ring is mounted on an axle; A seal member protruding in the width direction, wherein the inner ring extends in the width direction more than the outer ring, and the seal member slides on the outer diameter surface of the inner ring extension portion, and the seal at the inner ring extension portion is provided. An annular step portion having a smaller diameter than the sliding contact portion is provided on the center side of the sliding contact portion of the member in the inner ring width direction. In the case of this configuration, prevention of intrusion of wear powder and maintenance of a good lubrication state for a long period of time are the same as in the first aspect of the present invention. In the case of this configuration, an annular step portion having a smaller diameter than the sliding contact portion is provided on the center side of the inner ring extension portion in the inner ring width direction than the sliding contact portion of the seal member, so that when the seal member is disassembled. The seal member can be dropped into the step, and the seal member can be easily disassembled without applying a force to the retainer. Therefore, a reduction in the life of the bearing due to deformation of the cage and the like is prevented.

[0008] In these inventions, the inner ring extending portion may be provided on both sides in the width direction of the inner ring. By providing the inner ring extending portion also on the shaft end side in this manner, oil drainage of a conventionally used dedicated part can be omitted, and the number of parts can be reduced. Accordingly, variation in the axial position when the bearing is assembled is reduced.

Further, in these inventions, a sleeve may be provided on the outer periphery of the inner ring extending portion so as to slide the seal member. By providing the sleeve in this way,
The inner ring of the bearing is prevented from being worn due to the sliding contact of the seal member, and when the sealing function is deteriorated, only the seal member can be replaced to restore the initial sealing performance.

In these inventions, a lubricant may be interposed on the contact surface between the width surface of the inner race and the rear cover. By interposing the lubricant in this way, abrasion powder generated on the contact surface is reduced, and a good lubrication state can be maintained for a longer period of time. Further, in these inventions, the protrusion that protrudes the inner race and the back lid in the axial direction at the inner diameter portion of the width surface of the rear lid fits into the recess formed at the inner diameter portion of the width surface of the inner race. Alternatively, the seals may be joined to each other. As described above, the inner ring and the rear lid are joined together by the intaglio, thereby improving the assemblability of the railway vehicle bearing device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. This railway vehicle bearing device includes a bearing 1 mounted on an axle 10 and a front lid 2 and a rear lid 3 mounted on the axle 10 in contact with both sides of an inner ring 4 thereof. The bearing 1 is composed of a rolling bearing, more specifically, a double row tapered roller bearing, and divided inner rings 4A, 4A for rollers 6, 6 in each row.
The outer ring 5 is provided with a split type inner ring 4, an integrated outer ring 5, the rollers 6, a retainer 7, and a seal member 8 protruding and attached to the outer ring 5 in the width direction. The inner and outer rings 4 and 5 are made of bearing steel, and the front lid 2 and the rear lid 3 are made of carbon steel subjected to normalization. The rear cover 3 engages with a step portion of the axle 10 to regulate the position of the inner ring 4 of the bearing 1 in the axial direction. The front cover 2 is screwed into a male screw portion at the shaft end of the axle 10 to engage the inner ring 4. Is pressed against the back cover 3.

The inner race 4 extends in the width direction more than the outer race 5, and a seal member 8 slides on the outer diameter surface of the inner race extension 4a. The inner ring extension 4a extends from the flange 4b of the inner ring 4, and its outer diameter surface is formed smaller with a step than the flange 4b. An annular step 9 having a diameter smaller than that of the sliding contact portion 4aa is provided at a center of the inner ring extension portion 4a in the inner ring width direction from the sliding contact portion 4aa of the seal member 8. The seal member 8 is composed of an oil seal or the like.

As shown in FIG. 1B in an enlarged view of a portion B in FIG. 1A, a seal member 8 is attached to the inner diameter of the outer ring 5 and extends outside the seal extending from the outer ring 5 in the axial direction. Ring 11
A seal inner ring 12 attached to the inner diameter surface of the seal outer ring 11, and an elastic seal material 13 attached to the inner diameter surface of the seal inner ring 12. 4a is in sliding contact with the outer diameter surface. Elastic sealing material 13
Although various shapes are used, FIG. 1 schematically shows the specific shape omitted. The seal outer ring 11
It has a cross-sectional shape bent into a three-step cylindrical shape,
The distal end portion 11a loosely fits into an annular groove 14 formed in the width surface of the rear cover 3 to form a labyrinth seal 15.
Note that, specifically, for example, FIG.
Those described with can be used. The step portion 9 of the inner ring extending portion 4a is formed as an annular concave portion, and one side wall surface of the concave portion becomes a part of the side surface of the flange portion 4b. The inner ring 4 and the rear cover 3 are fitted into an annular recess 4c formed in the inner diameter of the width surface of the inner ring 4 with an annular protrusion 3a protruding in the axial direction from the inner surface of the width surface of the rear cover 3. As described above, it is preferable that the seals are connected to each other. The axial width of the annular concave portion 4c is a part of the length of the inner ring extending portion 4a. In this way, the inner ring 4 and the back cover 3 are joined together by an intaglio to improve the assemblability of the railcar bearing device. A lubricant 16 is provided on the contact surface c between the inner ring extension 4a and the rear cover 3.
Is preferably interposed. Grease or solid lubricant is used for the lubricant 16.

The configuration of the inner ring extension 4a and the seal member 8 on the front lid 2 side shown in FIG. 1A is the same as the configuration of the inner ring extension 4a and the seal member 8 on the rear lid 3 side. Also, a labyrinth seal similar to that on the rear lid 3 side is formed between the seal member 8 and the front lid 2.

According to the railway vehicle bearing device having this configuration,
Since the seal member 8 attached to the outer ring 5 is in sliding contact with the inner ring 4, the location where the abrasion powder is generated due to the contact between the inner ring 4 and the rear lid 3 is located outside the sealing area of the seal member 8.
Therefore, the abrasion powder generated on the contact surface c between the inner ring 4 and the rear cover 3 is prevented from entering the bearing 1 by the seal member 8, and does not enter the inside of the bearing. Can be maintained. Since the seal member 8 slides on the inner ring extension 4a, the raceway surface of the inner ring 4 is not narrowed,
There is no problem of load capacity reduction. Also, the back lid 3 is an inner ring 4
Since the inner ring 4 is provided separately from the inner ring 4, the inner ring 4 only needs to form the inner ring extending portion 4a necessary for sliding contact of the seal member 8, and processing is easy. The processing of the hardness and precision of the seal sliding contact surface 4aa of the inner ring 4 can be performed simultaneously with the inner ring extending portion 4a having such a simple shape at the time of manufacturing the inner ring. Since the lubricant 16 is interposed in the contact surface c between the width surface of the inner ring 4 and the rear cover 3, the amount of wear powder generated on the contact surface c is reduced, and a good lubrication state can be maintained for a longer period of time. Become. In addition, since the annular stepped portion 9 having a smaller diameter than the sliding contact portion is provided at the center of the inner ring extension portion 4a in the width direction of the inner ring from the sliding contact portion of the seal member 8, the sealing member such as an oil seal is provided. When disassembling the seal 8, the seal member 8 can be dropped into the step portion 9, and the seal member 8 can be easily disassembled without applying a force to the retainer 7. Therefore, a reduction in the life of the bearing 1 due to deformation of the retainer 7 and the like is prevented. Since the inner ring extending portion 4a is also provided on the front lid 2, the oil drain, which is a dedicated component conventionally provided on the shaft end side, can be omitted, and the number of components can be reduced.

FIG. 2 shows another embodiment of the present invention.
In this embodiment, a sleeve 17 for slidingly contacting the seal member 8 is provided on the outer periphery of the inner ring extending portion 4a. The sleeve 17 has, on the bearing end side, a folded ring portion 17a that is folded in a U-shaped cross section toward the center of the bearing.
It is attached to the inner ring extension 4a by press fitting. Other configurations are the same as the embodiment of FIG. It should be noted that the elastic seal material 13 and the like of the seal member 8 show specific examples of shapes in FIG. The seal inner ring 12 of the seal member 8 is made of a metal plate having an L-shaped cross section, and is fitted to the seal outer ring 11 at a cylindrical surface portion on the outer periphery thereof. The flat part of the seal inner ring 12 has a tip close to the outer diameter surface of the sleeve 17 to form a labyrinth seal. The elastic sealing material 13 is obtained by integrating a core metal and an elastic body such as rubber or synthetic resin, and is disposed closer to the bearing end than the flat plate portion of the seal inner ring 12. On the elastic portion of the elastic sealing material 13, two lips 13 each extending diagonally toward the center of the bearing toward the inner diameter side and having the tip lightly contacting the outer diameter surface of the sleeve 17.
a, 13b are provided side by side, and extend obliquely to the outer diameter side on the bearing end side, and the tip end is the folded ring portion 1 of the sleeve 17.
A second lip portion 13c is provided near the inner diameter surface of 7a. When the sleeve 17 is provided as in this embodiment, the inner ring 4 of the bearing is prevented from being worn by the sliding contact of the sealing member 8, and when the sealing function is deteriorated, only the sealing member 8 is replaced to improve the initial sealing performance. Can be restored.

In each of the above embodiments, the lubricant 16 is simply interposed on the contact surface c between the inner ring extending portion 4a and the back cover 3, but in the present invention, for example, as shown in FIG. A lubricant reservoir concave portion 18 may be provided on the contact surface between the extension portion 4a and the rear lid 3, and the interior may be filled with the lubricant 16. In the example shown in the figure, the lubricant reservoir concave portion 18 is provided on both the inner ring 4 and the rear lid 3 and the openings of the concave portions are aligned with each other. May be provided on any one of them. Lubricant storage recess 18
May be a groove extending in the circumferential direction, such as an annular groove,
Also, recesses may be provided at a plurality of locations in the circumferential direction. When the lubricant reservoir recesses 18 are provided at a plurality of locations in the circumferential direction, the lubricant reservoir recesses 18 may be grooves extending in the radial direction. When the groove extends in the radial direction, for example, the groove may have a depth extending from the outer diameter edge of the contact surface c of the inner ring or the rear cover 3 to the inner diameter side. Grease or solid lubricant is used for the lubricant 16 stored in the lubricant reservoir recess 18. Further, in the present invention, the contact surface c of the rear cover 3 with the inner ring extending portion 4a may be a surface hardened layer. Back cover 3
Is, for example, made of normalized carbon steel,
In that case, the surface hardened layer can be an induction hardened layer. The surface hardened layer may be a hardened layer formed by a process such as carburizing, carbonitriding, nitriding, or flame quenching, or may be a physical vapor deposition (PVD) or a chemical vapor deposition (CVD). It may be used as a hardened layer of a thin film by the method described above. As described above, even when the surface hardened layer is provided on the rear lid 3, wear on the contact surface of the rear lid 3 with the inner ring 4 is prevented. The inner ring 4 is generally subjected to a hardening process for hardening the raceway surface, so that it is not necessary to additionally perform a hardening process on the contact surface c. The formation of these surface hardened layers depends on the lubricant 1 on the contact surface c.
6 may be used together. In the contact surface between the front lid 2 and the inner ring 4, similarly to the contact surface c between the inner ring 4 and the rear cover 3, the interposition of the lubricant, the formation of the lubricant reservoir concave portion, and the formation of the hardened surface layer are performed. You may go. In addition, it is preferable that the inner ring 4 and the front lid 2 are connected to each other in a manner similar to the connection between the inner ring 4 and the rear lid 3.

[0018]

According to a first aspect of the present invention, there is provided a bearing device for a railway vehicle having a rear cover provided in contact with a width surface of an inner ring, wherein the sealing member is slidably contacted with an outer diameter surface of an inner ring extending portion. Therefore, the location where the abrasion powder generated from the contact portion between the inner ring and the back lid is outside the seal, and the seal member prevents the abrasion powder from entering the bearing. Therefore, a good lubrication state can be maintained for a long period of time. Further, since the rear lid is provided separately from the inner ring, the shape of the inner ring is prevented from being complicated, and the inner ring can be easily processed while the inner ring extending portion is provided. In addition, since the rear lid does not need to form the sliding surface of the seal member, it can be easily processed. According to a second aspect of the present invention, there is provided a bearing device for a railway vehicle in which a seal member is slidably contacted with an outer diameter surface of an inner ring extending portion, and the inner ring extending portion is closer to the center in the inner ring width direction than the sliding contact portion of the seal member. Since the annular step portion having a smaller diameter than the sliding contact portion is provided, abrasion powder generated at a contact portion between the inner ring and the rear lid does not enter the inside of the bearing, and a good lubricating state is maintained. The seal member can be easily disassembled without applying force to the retainer or the like when the seal member is disassembled.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a railway vehicle bearing device according to an embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view of a portion B in FIG. 1A.

FIG. 2 is a cross-sectional view showing a portion corresponding to FIG. 1B according to another embodiment of the present invention.

FIG. 3 shows still another embodiment of the present invention;
It is sectional drawing which showed the part corresponding to (B).

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bearing 2 ... Front cover 3 ... Back cover 4 ... Inner ring 4a ... Inner ring extension part 5 ... Outer ring 8 ... Seal member 9 ... Stepped part 10 ... Axle 16 ... Lubricant

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[Procedure amendment]

[Submission date] September 13, 2000 (2009.1)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[ Title of the Invention] Double row tapered roller bearing

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention is a double row of bearings instrumentation 置等 railcar used for the support of the railway vehicle axle
It relates to the tapered roller bearing.

[0002]

2. Description of the Related Art Conventionally, in a railway vehicle bearing device, as shown in FIG.
Using an oil drain 56, which is a special part separate from
The oil seal 55 is slidably contacted with the rear cover 6 and the rear cover 57.

[0003] However, the following problem arises with the configuration in which the seal 55 is slidably contacted with the oil drain 56 and the rear lid 57 in this manner. Bending of the axle 60 causes fretting on the sliding contact surface a between the inner ring 51 and the rear lid 57, and abrasion powder due to the fretting may be mixed into the bearing. The sliding surfaces of the seal such as the oil drain 56 and the back lid 57 are hard,
It is expensive because roughness and precision are required. That is,
In order to deal with the hardness, heat treatment of the oil drain 56 and the back lid 57 is required separately from the inner ring 51, so that the cost increases.
Further, in order to obtain the accuracy of the seal sliding contact surface, it is necessary to finish the inner surface and the width surface of the oil drain 56 and the back cover 57 with high accuracy, which increases the cost. Since the number of parts increases due to the oil drain 56, the variation in the assembly width increases, and the variation in the axial position at the time of mounting the bearing also increases.

[0003] As a countermeasure against some of these problems, a part for a rear cover 57 is formed integrally with the inner ring 51 and a seal 55 is slidably contacted with the extended part. A bearing device has been proposed.
No. 55371). According to this, no abrasion powder is generated on the contact surface between the inner ring 51 and the back lid 57, and the intrusion of the abrasion powder into the bearing is prevented. However, in the case of the above proposed example, since the inner race 51 and the rear lid 57 are formed as an integral part, machining is difficult. That is, the back lid 5
The portion 7 is required to be formed on the inner surface corresponding to the step or the curved surface of the outer surface of the axle 60, and the shape is complicated. Processing as an integral part with the required inner ring 51
It is considered difficult in practice. In the case of a bearing device in which a seal 55 made of an oil seal or the like is slidably contacted with an extended portion of the inner ring 51, it is difficult to remove the seal 55 during maintenance, and a force is applied to the retainer 54. May be required.

[0004]

SUMMARY OF THE INVENTION A double row conical device according to the present invention is provided.
The roller bearing consists of a double-row conical roller and a pair of split inner rings.
Of the split type provided for each row above
Wheel, integrated outer ring, and retainers that hold the rollers in each row above
And is attached to the outer ring and protrudes from this outer ring in the width direction.
And the two divided inner races have a width
The inner ring consisting of the split inner ring
Extends in the width direction from the outer ring, and the outer diameter of the inner ring extension
The seal member is slid on the surface. According to this construction, since the sealing member attached to the outer ring sliding contact with the inner ring, occurrence point of abrasion powder due to contact with the inner ring is located outside the sealing area by the seal member. Me Other,
Milling耗粉is blocked by the sealing member may enter into the bearing, not mixed inside the bearing can be maintained good lubrication condition for a long time. Since the seal member is in sliding contact with the inner ring extending portion, the raceway surface of the inner ring is not narrowed, and there is no problem of reduction in load capacity. Also, it is only the inner wheel forms the inner ring extension portion needed to sliding contact of the seal, can be easily processed. Processing hardness and accuracy of the seal sliding surface of the inner ring, the inner ring extension portion of a simple shape formed in this way, since performed at the same time the inner race production, fewer manufacturing steps, that Do and inexpensive.

[0005]

DETAILED DESCRIPTION OF THE INVENTION double according to one exemplary type state of the present invention
A railway vehicle bearing device provided with row tapered roller bearings will be described with reference to FIG. This railway vehicle bearing device includes a bearing 1 mounted on an axle 10 and a front lid 2 and a rear lid 3 mounted on the axle 10 in contact with both sides of an inner ring 4 thereof.
The bearing 1 is composed of a rolling bearing, more specifically, a double-row tapered roller bearing, and divided inner rings 4A, 4
A, a divided inner ring 4 provided with A, an integrated outer ring 5,
The vehicle includes a roller 6, a retainer 7, and a seal member 8 attached to the outer ring 5 so as to protrude in the width direction. The inner and outer rings 4 and 5 are made of bearing steel, and the front lid 2 and the rear lid 3 are made of carbon steel subjected to normalization. The rear cover 3 engages with a step portion of the axle 10 to regulate the position of the inner ring 4 of the bearing 1 in the axial direction. The front cover 2 is screwed into a male screw portion at the shaft end of the axle 10 to engage the inner ring 4. Is pressed against the back cover 3.

[0006] The inner race 4 extends in the width direction than the outer race 5, and a seal member 8 slides on the outer diameter surface of the inner race extension 4a. The inner ring extension 4a extends from the flange 4b of the inner ring 4, and its outer diameter surface is formed smaller with a step than the flange 4b. An annular step 9 having a diameter smaller than that of the sliding contact portion 4aa is provided at a center of the inner ring extension portion 4a in the inner ring width direction from the sliding contact portion 4aa of the seal member 8. The seal member 8 is composed of an oil seal or the like.

[0007] As shown in FIG. 1B in an enlarged view of a portion B in FIG. 1A, the seal member 8 is attached to the inner diameter portion of the outer ring 5 and extends outside the seal extending from the outer ring 5 in the axial direction. Ring 11
A seal inner ring 12 attached to the inner diameter surface of the seal outer ring 11, and an elastic seal material 13 attached to the inner diameter surface of the seal inner ring 12. 4a is in sliding contact with the outer diameter surface. Elastic sealing material 13
Although various shapes are used, FIG. 1 schematically shows the specific shape omitted. The seal outer ring 11
It has a cross-sectional shape bent into a three-step cylindrical shape,
The distal end portion 11a loosely fits into an annular groove 14 formed in the width surface of the rear cover 3 to form a labyrinth seal 15.
Note that, specifically, for example, FIG.
Those described with can be used. The step portion 9 of the inner ring extending portion 4a is formed as an annular concave portion, and one side wall surface of the concave portion becomes a part of the side surface of the flange portion 4b. The inner ring 4 and the rear cover 3 are fitted into an annular recess 4c formed in the inner diameter of the width surface of the inner ring 4 with an annular protrusion 3a protruding in the axial direction from the inner surface of the width surface of the rear cover 3. As described above, it is preferable that the seals are connected to each other. The axial width of the annular concave portion 4c is a part of the length of the inner ring extending portion 4a. In this way, the inner ring 4 and the back cover 3 are joined together by an intaglio to improve the assemblability of the railcar bearing device. A lubricant 16 is provided on the contact surface c between the inner ring extension 4a and the rear cover 3.
Is preferably interposed. Grease or solid lubricant is used for the lubricant 16.

The configuration of the inner ring extension 4a and the sealing member 8 on the front lid 2 side shown in FIG. 1A is the same as the configuration of the inner ring extension 4a and the sealing member 8 on the rear lid 3 side. Also, a labyrinth seal similar to that on the rear lid 3 side is formed between the seal member 8 and the front lid 2.

According to the bearing device for a railway vehicle having this configuration,
Since the seal member 8 attached to the outer ring 5 is in sliding contact with the inner ring 4, the location where the abrasion powder is generated due to the contact between the inner ring 4 and the rear lid 3 is located outside the sealing area of the seal member 8.
Therefore, the abrasion powder generated on the contact surface c between the inner ring 4 and the rear cover 3 is prevented from entering the bearing 1 by the seal member 8, and does not enter the inside of the bearing. Can be maintained. Since the seal member 8 slides on the inner ring extension 4a, the raceway surface of the inner ring 4 is not narrowed,
There is no problem of load capacity reduction. Also, the back lid 3 is an inner ring 4
Since the inner ring 4 is provided separately from the inner ring 4, the inner ring 4 only needs to form the inner ring extending portion 4a necessary for sliding contact of the seal member 8, and processing is easy. The processing of the hardness and precision of the seal sliding contact surface 4aa of the inner ring 4 can be performed simultaneously with the inner ring extending portion 4a having such a simple shape at the time of manufacturing the inner ring. Since the lubricant 16 is interposed between the contact surface c between the width surface of the inner ring 4 and the rear cover 3, the amount of wear powder generated on the contact surface c is reduced, and a good lubrication state can be maintained for a longer period of time. Become. In addition, since the annular stepped portion 9 having a smaller diameter than the sliding contact portion is provided at the center of the inner ring extension portion 4a in the width direction of the inner ring from the sliding contact portion of the seal member 8, the sealing member such as an oil seal is provided. When disassembling the seal 8, the seal member 8 can be dropped into the step portion 9, and the seal member 8 can be easily disassembled without applying a force to the retainer 7. Therefore, a reduction in the life of the bearing 1 due to deformation of the retainer 7 and the like is prevented. Since the inner ring extending portion 4a is also provided on the front lid 2, the oil drain, which is a dedicated component conventionally provided on the shaft end side, can be omitted, and the number of components can be reduced.

FIG. 2 shows another embodiment of the present invention.
In this embodiment, a sleeve 17 for slidingly contacting the seal member 8 is provided on the outer periphery of the inner ring extending portion 4a. The sleeve 17 has, on the bearing end side, a folded ring portion 17a that is folded in a U-shaped cross section toward the center of the bearing.
It is attached to the inner ring extension 4a by press fitting. Other configurations are the same as the embodiment of FIG. It should be noted that the elastic seal material 13 and the like of the seal member 8 show specific examples of shapes in FIG. The seal inner ring 12 of the seal member 8 is made of a metal plate having an L-shaped cross section, and is fitted to the seal outer ring 11 at a cylindrical surface portion on the outer periphery thereof. The flat part of the seal inner ring 12 has a tip close to the outer diameter surface of the sleeve 17 to form a labyrinth seal. The elastic sealing material 13 is obtained by integrating a core metal and an elastic body such as rubber or synthetic resin, and is disposed closer to the bearing end than the flat plate portion of the seal inner ring 12. On the elastic portion of the elastic sealing material 13, two lips 13 each extending diagonally toward the center of the bearing toward the inner diameter side and having the tip lightly contacting the outer diameter surface of the sleeve 17
a, 13b are provided side by side, and extend obliquely to the outer diameter side on the bearing end side, and the tip end is the folded ring portion 1 of the sleeve 17.
A second lip portion 13c is provided near the inner diameter surface of 7a. When the sleeve 17 is provided as in this embodiment, the inner ring 4 of the bearing is prevented from being worn by the sliding contact of the sealing member 8, and when the sealing function is deteriorated, only the sealing member 8 is replaced to improve the initial sealing performance. Can be restored.

In each of the above embodiments, the lubricant 16 is simply interposed between the contact surface c between the inner ring extending portion 4a and the rear cover 3. In the present invention, for example, as shown in FIG. A lubricant reservoir concave portion 18 may be provided on the contact surface between the extension portion 4a and the rear lid 3, and the interior may be filled with the lubricant 16. In the example shown in the figure, the lubricant reservoir concave portion 18 is provided on both the inner ring 4 and the rear lid 3 and the openings of the concave portions are aligned with each other. May be provided on any one of them. Lubricant storage recess 18
May be a groove extending in the circumferential direction, such as an annular groove,
Also, recesses may be provided at a plurality of locations in the circumferential direction. When the lubricant reservoir recesses 18 are provided at a plurality of locations in the circumferential direction, the lubricant reservoir recesses 18 may be grooves extending in the radial direction. When the groove extends in the radial direction, for example, the groove may extend from the outer diameter edge of the contact surface c of the inner ring or the rear lid 3 to the inner diameter side to a certain point. Grease or solid lubricant is used for the lubricant 16 stored in the lubricant reservoir recess 18. Also, the contact surface c of the inner ring extension portion 4a of the rear filter lid 3 may be surface hardened layer. The back cover 3 is made of, for example, carbon steel subjected to normalization. In this case, the surface hardened layer can be an induction hardened layer. In addition, the surface hardened layer may be a hardened layer by a treatment such as carburizing, carbonitriding, nitriding, or flame quenching, and may be a physical vapor deposition (PVD) or a chemical vapor deposition (CVD). It may be used as a hardened layer of a thin film by the above method. As described above, even when the surface hardened layer is provided on the rear lid 3, wear on the contact surface of the rear lid 3 with the inner ring 4 is prevented. The inner ring 4 is generally subjected to a hardening process for hardening the raceway surface, so that it is not necessary to additionally perform a hardening process on the contact surface c. The formation of these surface hardened layers may be used together with the interposition of the lubricant 16 on the contact surface c. The contact surface between the front lid 2 and the inner ring 4 is also provided on the inner ring 4
In the same manner as in the contact surface c between the back cover 3 and the surface, the interposition of the lubricant, the formation of the lubricant reservoir concave portion, and the formation of the hardened surface layer may be performed. In addition, it is preferable that the inner ring 4 and the front lid 2 are connected to each other in a manner similar to the connection between the inner ring 4 and the rear lid 3.

[0012]

Effects of the Invention double row tapered roller bearing of the present invention because it was brought into sliding contact with the seal member to the outer diameter surface of the inner ring extension portion, occurrence place of abrasion powder composed of the contact portion between the inner ring Is outside the seal, and the seal member prevents wear powder from entering the bearing. Therefore, a good lubrication state can be maintained for a long period of time. Also, while providing an inner Wanobede part,
The inner ring of processing Ru easily be performed.

[Brief description of the drawings]

1 (A) is a double row circles that written to an embodiment of the present invention
Sectional view of the railway vehicle bearing apparatus provided with a tapered roller bearing,
(B) is an enlarged sectional view of the B part of the same figure (A).

FIG. 2 is a cross-sectional view showing a portion corresponding to FIG. 1B according to another embodiment of the present invention.

FIG. 3 shows still another embodiment of the present invention;
It is sectional drawing which showed the part corresponding to (B).

FIG. 4 is a sectional view of a conventional example.

[Description of Reference Numerals] 1 ... bearing 2 ... front cover 3 ... rear lid 4 ... inner wheel 4A ... divided inner rings 4 a ... inner extended portion 5 ... outer ring 8 ... sealing member 9 ... stepped portion 10 ... axle 16 ... lubricant

Claims (6)

[Claims] 1. A double-row rolling bearing having an inner ring, an outer ring, and a rolling element, wherein the inner ring is mounted on an axle, and mounted on the axle in contact with a width surface of the inner ring opposite to the axle shaft end. A back cover, a seal member attached to the outer ring and projecting in the width direction from the outer ring, the inner ring extends in the width direction more than the outer ring, and the seal member is provided on the outer diameter surface of the inner ring extending portion. A sliding rail bearing device. 2. A double-row rolling bearing having an inner ring, an outer ring, and a rolling element, wherein the inner ring is mounted on an axle; and a seal member attached to the outer ring and projecting in a width direction from the outer ring. The inner ring extends in the width direction than the outer ring, and the seal member slides on the outer diameter surface of the inner ring extension portion, and the center of the inner ring extension portion in the inner ring width direction is larger than the sliding contact portion of the seal member. A bearing device for a railway vehicle provided with an annular step portion having a smaller diameter than the sliding contact portion on the side. 3. The railway vehicle bearing device according to claim 1, wherein the inner ring extending portion is provided on both sides in the width direction of the inner ring. 4. The bearing device for a railway vehicle according to claim 1, wherein a sleeve for slidingly contacting the seal member is provided on an outer periphery of the inner ring extending portion. 5. The railway vehicle bearing device according to claim 1, wherein a lubricant is interposed between a contact surface of the inner ring and a rear cover. 6. The inner ring and the rear lid are mutually engaged such that a projection that projects axially from the inner diameter of the width surface of the rear lid fits into a recess formed in the inner diameter of the width surface of the inner ring. The railcar bearing device according to any one of claims 1 to 5, wherein the bearing device is joined to an inro.