JP2004332905A - Bearing device for rail vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a rail vehicle capable of suppressing the production of fretting abrasive powder, preventing the produced abrasive powder from flowing out into a bearing, and having excellent assemblability in manufacture. <P>SOLUTION: An annular spacer 20 formed by fixing an annular elastic seal material 21 to an outer diameter side peripheral edge part integrally with each other is installed between the width face of the inner ring 3 of a roller bearing 2 fitted to an axle 1 and the width face of a rear cover 11 (ring member) fitted to the axle 1 and restricting the axial position of the inner ring 3 relative to the axle 1 so as to be brought into a slidable contact with each other in the state of elastically and deformably fitting the elastic seal member 21 to the outer periphery of a projected step part 25 formed on the width face of the rear cover 11. The annular spacer 20 is sealed by the elastic seal material 21 in a contact part between the inner ring 3 and the rear cover 11 in the state of pressing the elastic seal member 21 by the width faces of the inner ring 3 and the rear cover 11 opposed to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing device that supports an axle of a railway vehicle with a rolling bearing.
[0002]
[Prior art]
An axle bearing device of a railway vehicle includes a rolling bearing attached to the axle and a pair of front and rear ring members that are attached to the axle and axially position the inner ring of the rolling bearing. The ring member is made of carbon steel material that has been normalized, either a rear lid that contacts the rear width surface of the inner ring and an oil drain that contacts the front width surface, or a rear lid and front cover that contacts the front and rear width surfaces of the inner ring. Has been.
[0003]
FIG. 7 shows a general railway vehicle bearing device. In this bearing device, a pair of ring members of a rear lid 11 and a front lid 12 are brought into contact with both ends of an inner ring 3 of a rolling bearing 2 mounted on an axle 1. The rolling bearing 2 is, for example, a double-row tapered roller bearing, a split-type inner ring 3, an integral outer ring 4, a double-row roller 5 disposed between the inner ring 3 and the outer ring 4, and a cage 6. Have A rear lid 11 is inserted into the axle 1, the rolling bearing 2 is assembled, and a front lid 12 is inserted. The front lid 12 is pressed against the front width surface of the inner ring 3, and the rear width surface of the inner ring 3 is pressed against the front width surface of the rear lid 11 to restrict the axial position of the inner ring 3 relative to the axle 1. In addition, oil seals 14 and 14 are slidably attached to the outer circumferences of the rear lid 11 and the front lid 12, and the oil seals 14 and 14 are seal covers 15 and 15 extending from the front and rear ends of the outer ring 4. Installed inside.
[0004]
In such a bearing device, when an excessive radial load peculiar to a railway vehicle is applied to the axle 1, an excessive bending moment is applied to the axle 1, and repeated stress is generated at the contact portion X between the inner ring 3 and the rear lid 11. However, stress is repeatedly generated in the contact portion Y between the inner ring 3 and the front lid 12, and the contact surfaces of the contact portions X and Y are fretting (weared) to generate minute wear powder of the carbon steel material. Such fretting wear is unavoidable for a railway vehicle in which an excessive radial load is applied to the axle 1, and if the fretting wear continues, the axial accuracy of the bearing 2 decreases, and the generated wear powder is reduced. It penetrates into the inside of the bearing 2 and deteriorates the lubricant in the bearing, causing the life of the bearing 2 to be shortened.
[0005]
As a bearing device that suppresses the generation of fretting wear powder as described above, there is a device in which a soft spacer (plate) is interposed between an inner ring and a ring member such as a back cover (see, for example, Patent Document 1). . FIG. 8 shows that a spacer 32 made of a soft metal plate or a resin plate is interposed at the contact portion X between the inner ring 3 and the rear lid 11 so that the spacer 32 avoids a direct collision between the inner ring 3 and the rear lid 11 to generate fretting wear. I try to suppress it. When the spacer 32 is worn, it is replaced with a new one, and as a result, the bearing device has a long life.
[0006]
In order to solve the above problem, a bearing device (for example, see FIG. 8 of Patent Document 2) is known in which fretting wear powder generated by wear due to direct contact between the inner ring and the ring member does not enter the inside of the bearing. ing. FIG. 9 shows that the elastic member 33 such as a rubber ring is brought into elastic contact with the outer peripheral portion of the contact portion X between the inner ring 3 and the rear lid 11 so that the abrasion powder generated at the contact portion X does not leak out from the contact portion X. It is a thing. The outer diameter side of the contact portion X in this case is a circumferential surface where the outer circumferences of the same outer diameter of the inner ring 3 and the back lid 11 are abutted, and the elastic member 33 is firmly pressed against the circumferential surface to thereby contact the contact portion X. Is sealed in a gas-liquid manner so that wear powder does not flow out to the bearing 2.
[0007]
[Patent Document 1]
JP 2001-027254 A (FIG. 1)
[0008]
[Patent Document 2]
JP 2001-354136 A (FIG. 8)
[0009]
[Problems to be solved by the invention]
The railcar bearing device of FIG. 8 is effective in that the spacer 32 suppresses the wear of the inner ring 3 and the rear lid 11 and reduces the generation of fretting wear powder. It is unavoidable that the trouble flows out into the bearing and deteriorates the lubricant in the bearing, and it is difficult to suppress the trouble.
[0010]
9, the outflow of fretting wear powder from the contact portion X of the inner ring 3 and the rear lid 11 to the bearing can be suppressed by the elastic member 33. However, the generation of wear powder at the contact portion X and the wear powder Problems due to accumulation still remain.
[0011]
From the above, it is considered that both the spacer of FIG. 8 and the elastic member of FIG. 9 are combined and used in one bearing device, but in this case, the number of components increases, Assembling man-hours increase, making it difficult to manufacture and assemble the bearing device.
[0012]
An object of the present invention is to provide a bearing device for a railway vehicle with good manufacturing and assembling performance, which suppresses the generation of fretting wear powder and suppresses the generated wear powder from flowing into the bearing. It is in.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides both width surfaces between a width surface of an inner ring of a rolling bearing attached to an axle and a width surface of a ring member attached to the axle and restricting the axial position of the inner ring with respect to the axle. In the bearing device in which the annular spacer is interposed by abutting, an annular elastic sealing material that is elastically deformed and abutted on both the opposing width surfaces of the inner ring and the ring member is integrally fixed to the outer peripheral side peripheral portion of the annular spacer. (Invention of claim 1)
[0014]
The ring member in contact with the width surface of the inner ring in the present invention is a rear lid and oil stopper as described in FIG. 7, or a front lid in place of the rear lid and oil stopper, and an annular spacer between the inner ring and the rear lid. An annular spacer is also interposed between the inner ring and the oil stopper or the front lid. Normally, fretting wear powder is more likely to be generated between the inner ring and the rear lid than between the inner ring and the oil stopper or the front lid, so an annular spacer may be interposed only between the inner ring and the rear lid. It is valid. In addition, the annular spacer avoids direct contact between the inner ring and the ring member and suppresses the generation of fretting wear powder as much as possible, and is preferably a soft metal thin plate such as a copper alloy. An annular spacer with an elastic seal material, which is one part, is manufactured by integrating and fixing an elastic seal material such as an annular rubber to the outer peripheral side peripheral edge portion of the annular spacer. Assemble in between. An elastic seal material is elastically deformed and brought into contact with the opposed width surfaces of the inner ring and the ring member, so that the outer peripheral area of the contact portion between the inner ring and the width surface of the ring member that is in contact with both the front and rear width surfaces of the annular spacer is an annular elastic seal. Sealed gas-liquid tightly with the material. The abrasion powder generated and accumulated at the contact part flows to the elastic seal material along the width of the annular spacer, but when it reaches the elastic seal material, it is prevented from flowing out and flows into the bearing beyond the elastic seal material. No worries to do.
[0015]
Further, in the present invention, the step portion in which the annular elastic seal material is detachably fitted to the ring member that contacts the elastic seal material integrated with the outer peripheral side peripheral portion of the annular spacer and / or the width surface of the inner ring. Can be formed (Invention of Claim 2). For example, when a step portion is formed on the width surface of the ring member, a step processing portion (step portion) is formed that is recessed along the outer periphery of the annular inner diameter portion that contacts the annular spacer on the width surface of the ring member. The inner periphery of the elastic seal material is pressed and fitted to the outer periphery of the part. By fitting the elastic seal material of the spacer with the elastic seal material to the stepped portion of the ring member in this way, the mounting position of the annular spacer is not shifted at the time of shipment or installation to the axle, and the assemblability is improved. Attached quality can be set high. It is advantageous in manufacturing that the stepped portion to which the elastic seal material as described above is fitted is provided on either the width surface of the ring member or the width surface of the inner ring, but it is provided on both the ring member and the inner ring and both of them are provided. An elastic sealing material can be fitted together in the stepped portion.
[0016]
In the present invention, an elastic sealing material can be integrally fixed to the inner peripheral edge of the annular spacer (invention of claim 3). The elastic sealing material in this case is called a second elastic sealing material in order to distinguish it from the elastic spacer that is integrally fixed to the outer peripheral side peripheral portion of the annular spacer. This second elastic sealing material is similar to an elastic spacer (hereinafter referred to as a first elastic spacer as necessary) integrally fixed to the outer peripheral side peripheral portion of the annular spacer, and both width surfaces of the inner ring and the ring member. By being elastically deformed and closely contacting, the contact portion between the inner ring and the ring member is sealed from both the inner and outer diameters, and the outflow of wear powder to both the inner and outer diameters is prevented.
[0017]
When the second elastic seal material is used, a second step portion in which the second elastic seal material is detachably fitted to the width surface of the ring member and / or the inner ring that contacts the second elastic seal material is provided. It is desirable to form (Invention of Claim 4). By fitting both the second elastic sealing material and the first elastic sealing material to the corresponding step portions of the ring member and the inner ring, the mounting position of the annular spacer at the time of shipment or assembling to the axle can be improved. As a result, the assemblability becomes better.
[0018]
Further, in the present invention, it is practically desirable that the annular spacer is a thin plate made of a copper alloy provided with means for retaining oil containing a lubricant (invention of claim 5). As a means to contain and hold the lubricant in the copper alloy thin plate, the lubricant holding grooves formed in the vertical and horizontal directions on the surface, a number of minute depressions partially formed on the surface, a number of small diameters penetrating the front and back surfaces The through hole is suitable. By holding the lubricant in the copper alloy annular spacer itself, the lubricity between the inner ring and the ring member is increased, the wear of the annular spacer itself is also suppressed, and the effect of suppressing the generation of fretting wear powder is increased.
[0019]
The rolling bearing according to the present invention is preferably a double-row tapered roller bearing for practical use, but may be a ball bearing depending on the type of railway vehicle.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment will be described below in order with reference to FIGS. 1 to 3 and the second embodiment with reference to FIGS. 4 to 6. The railway vehicle bearing device of each of these embodiments has the same basic structure as the bearing device of FIG. 7, and therefore, the same reference numerals are given to the same or corresponding parts as in FIG. Avoid duplication.
[0021]
In the first embodiment shown in FIGS. 1 (A) and 1 (B), a single annular spacer 20 with an elastic seal material is interposed between the contact portion X of the inner ring 3 and the rear lid 11 (ring member). The rear width surface of the inner ring 3 and the front width surface of the rear lid 11 are brought into contact with the width surfaces on both sides of the spacer 20. The annular spacer 20 with an elastic seal material is a part in which an elastic seal material 21 such as an annular rubber ring is integrally fixed to the outer peripheral side peripheral portion of the spacer 20 which is an annular soft metal thin plate.
[0022]
The annular spacer 20 is formed by press-molding a soft metal thin plate made of, for example, a copper alloy, and integrally has a rib portion 20a bent substantially 90 ° rearward at the outer peripheral side peripheral edge portion, and the entire surface of the rib portion 20a is formed. The elastic sealing material 21 is integrated so as to cover. The elastic sealing material 21 is an abrasion-resistant elastic member such as nitrile rubber, and is molded in an annular shape covering the front and back surfaces of the annular rib portion 20a of the annular spacer 20, and is fixed to the rib portion 20a. Also, a plurality of tooth portions 20b as shown in FIGS. 3A and 3B are integrally provided at the open end of the rib portion 20a, and the sealing material 21 is provided between the tooth portions adjacent to the tooth portion 20b. As a result, the fixing strength between the spacer 20 and the sealing material 21 is ensured to be high. The annular elastic sealing material 21 formed so as to cover the rib portion 20a protruded to the one-width surface side of the annular spacer 20 protrudes greatly to the one-width surface side of the annular spacer 20, and slightly protrudes to the opposite width surface side. Then, the back cover 11 and the inner race 3 are brought into pressure-contact with the opposite width surfaces as described later.
[0023]
FIG. 1B shows the front width surface M1 of the rear lid 11 and the rear width surface M2 of the inner ring 3. The width surface M2 of the inner ring 3 is one annular flat surface, and the width surface M1 of the rear lid 11 is an annular inner flat surface. The step portion 25 bisects the surface N1 and the outer diameter side flat surface N2. The step portion 25 is a portion that becomes a concave step at approximately 90 ° from the outer periphery of the inner diameter side flat surface N1, and the outer diameter side flat surface N2 extends from the rear end of the step portion 25. As shown in FIG. 2, the radius r1 of the outer periphery of the step portion 25 is set to be slightly larger than the normal radius r2 of the annular elastic sealing material 21 in the annular spacer 20 with the elastic sealing material that is not elastically deformed. Further, the width W2 of the elastic seal material 21 in a normal state shown in FIG. 2 is set to be slightly larger than the sum of the step W1 of the step portion 25 and the plate thickness of the spacer 20.
[0024]
An annular spacer 20 with an elastic seal material, in which an elastic seal material 21 is integrated with an outer peripheral side peripheral portion of the annular spacer 20, is press-fitted to the outer periphery of a step portion 25 protruding from the width surface M <b> 1 of the rear lid 11. The lid 11 is assembled integrally. The annular elastic sealing material 21 is elastically deformed and press-contacts with the outer periphery of the step portion 25 and the outer-diameter side flat surface N2 so as to be in close contact with each other so as to be able to slide. By elastically fitting the elastic sealing material 21 to the step portion 25, the relative positional relationship between the rear lid 11 and the annular spacer 20 is fixed, and the annular spacer 20 is not displaced or dropped. When the rear lid 11 is fitted on the axle 1 and the bearing 2 is assembled to the axle 1, there is no fear of the positional displacement and dropout of the annular spacer 20, the assemblability of the bearing device is improved, and the assembly accuracy is stabilized.
[0025]
As shown in FIG. 1 (B), when the assembly of the bearing device is completed, the annular spacer 20 abuts against the inner diameter side flat surface N1 of the rear cover 11 and the width surface M2 of the inner ring 3, and the rear cover 11 and the inner ring 3 are directly connected. To avoid wear due to contact with the fretting and to prevent the generation of fretting wear powder. At the same time, the elastic sealing material 21 is in pressure contact with the outer periphery of the step portion 25 of the back lid 11 and the outer diameter side flat surface N2, and is in pressure contact with the width surface M2 of the inner ring 3, so that the outer peripheral area of the contact portion X between the rear cover 11 and the inner ring 3 is Is sealed gas-liquid tightly. Therefore, even if spacer wear powder is generated in the contact portion X, the wear powder is prevented from flowing out of the contact portion by the elastic sealing material 21, and the inflow of the fretting wear powder into the bearing 2 is ensured. This prevents the bearing 2 from having a long life.
[0026]
Further, in the bearing device of FIG. 1 (A), when the axle 1 is bent by a load applied to the axle 1, an outer diameter side flat surface formed to be recessed on the outer diameter side of the width surface M1 of the rear lid 11 with respect to this bending. The gap at N2 becomes an escape portion that allows the deflection, and generation of fretting wear powder at the contact portion X is more effectively suppressed at the escape portion.
[0027]
In the bearing device of the second embodiment shown in FIGS. 4A and 4B, the annular elastic sealing material 22 is integrally fixed to the inner peripheral side peripheral portion of the annular spacer 20. The inner diameter side elastic sealing material 22 is a second elastic sealing material, and the outer diameter side elastic sealing material 21 is a first elastic sealing material. The first elastic sealing material 21 is elastically deformed and fitted to the outer periphery of the step portion 25 of the rear lid 11 as in FIG. The second elastic sealing material 22 is advantageously formed from a rubber material having the same quality as that of the first elastic sealing material 21, but it can also be formed from a different elastic material.
[0028]
A second step 26 is formed on the inner diameter side of the width surface M <b> 1 of the rear lid 11 so as to correspond to the second elastic seal 22, and the second elastic seal 22 is provided on the inner periphery of the second step 26. It is made to be elastically deformed and fitted. As shown in FIG. 5, the radius r3 of the inner periphery of the second step portion 26 is set slightly smaller than the normal radius r4 of the outer diameter of the second elastic sealing material 22, and the second step portion 26 The total thickness of the step W3 and the spacer 20 is set slightly smaller than the normal width W4 of the second elastic sealing material 22. In this way, in the bearing device assembly, the contact portion X between the rear lid 11 and the inner ring 3 is sealed with the first elastic sealing material 21 on the outer diameter side and sealed with the second elastic sealing material 22 on the inner diameter side. Thus, the outflow of fretting wear powder from the contact portion X toward the inner and outer diameters and the outer direction is prevented, and the flow of wear powder into the bearing is prevented with higher certainty.
[0029]
Further, since the inner diameter side of the second step portion 26 of the width surface M1 of the rear lid 11 is eliminated, the area in contact with the spacer 20 is reduced, and the generation amount of fretting wear powder is reduced accordingly.
[0030]
Further, the annular spacer 20 can be a thin plate made of a copper alloy that holds a lubricant such as grease. For example, as shown in FIG. 6A, a large number of grooves 27 are formed in an array such as a lattice on both the front and back surfaces of a thin spacer 20 made of copper alloy, and the grooves 27 serve as a grease reservoir. Alternatively, as shown in FIG. 6B, a large number of small depressions 28 are formed in a polka dot pattern on both the front and back surfaces of the spacer 20, and the depressions 28 are used as grease reservoirs. When the spacer 20 is provided with a grease retaining function for the grease in this way, the lubricity of the contact portion X where the inner ring 3 and the rear cover 11 are in contact with each other is stabilized for a long time with the grease accumulated in the groove 27 and the like. The generation of fretting wear powder at the contact portion X is further reduced, and the life of the bearing 2 can be extended.
[0031]
Needless to say, the lubricant containing holding of the spacer as shown in FIG. 6 is also applicable to the spacer of FIG.
[0032]
【The invention's effect】
According to the present invention, generation of fretting wear powder at a contact portion between a bearing inner ring and a ring member such as a rear lid that restricts the position of the inner ring with respect to the axle is suppressed by the interposition of the annular spacer, and the spacer Even if wear powder is generated from the outer periphery, the elastic seal material integrated with the outer peripheral edge of the spacer prevents the wear powder from flowing into the bearing, thereby extending the bearing life. The maintenance cycle for the maintenance and inspection of the bearing device can be extended.
[0033]
In addition, since the elastic seal material is integrally fixed to the outer peripheral side peripheral edge of the annular spacer and manufactured as one part, the handling and maintenance management of the spacer and the seal material are facilitated, and the manufacturing cost can be reduced. Furthermore, the annular spacer with elastic sealant is fitted and assembled to the step provided on the width surface of the ring member or inner ring, so that the assembly performance of the annular spacer with elastic sealant is improved and the position of the annular spacer with respect to the axle is improved. Misalignment does not occur, and manufacturing and assembly of a high-quality bearing device is facilitated.
[0034]
Also, by integrally forming an elastic seal material on the inner peripheral edge of the annular spacer, it is possible to prevent the fretting wear powder from flowing out to the inner and outer diameter sides of the contact portion between the inner ring and the ring member, and to make the bearing longer. Life expectancy can be improved.
[Brief description of the drawings]
FIG. 1 (A) is a cross-sectional view of a railway vehicle bearing device showing a first embodiment;
(B) is an expanded sectional view of the principal part.
FIG. 2 is an exploded cross-sectional view of a main part of the bearing device of FIG.
3A is a partially enlarged cross-sectional view of the annular spacer with an elastic seal material in FIG.
(B) is a partial top view including a partial cross section.
FIG. 4A is a sectional view of a railway vehicle bearing device showing a second embodiment;
(B) is an expanded sectional view of the principal part.
5 is an exploded cross-sectional view of a main part of the bearing device of FIG. 3;
6A is a cross-sectional view including a partially enlarged front view for explaining a specific structure of a spacer in the bearing device of FIG. 5;
(B) is sectional drawing for demonstrating another concrete structure.
FIG. 7 is a cross-sectional view for explaining a basic structure of a conventional railway vehicle bearing device.
8 is a partially enlarged cross-sectional view for explaining a conventional structure of the bearing device of FIG.
9 is a partial cross-sectional view for explaining another conventional structure of the bearing device of FIG.
[Explanation of symbols]
1 Axle 2 Bearing 3 Inner ring 4 Outer ring 5 Roller 11 Rear cover (ring member)
X Contact 12 Oil stop (ring member)
Y contact portion 20 annular spacer 21 elastic seal material 22 elastic seal material 25 step portion 26 step portion 27 groove (means for retaining lubricant containing oil)
28 Indentation (Means for retaining lubricant containing oil)

Claims (6)

An annular spacer is interposed between the width surface of the inner ring of the rolling bearing mounted on the axle and the width surface of the ring member that is mounted on the axle and regulates the axial position of the inner ring with respect to the axle. In the bearing device made,
An annular elastic seal material that is elastically deformed and abutted against both opposing width surfaces of the inner ring and the ring member is integrally fixed to the outer peripheral side peripheral portion of the annular spacer. 2. A bearing device for a railway vehicle according to claim 1, wherein a step portion into which the annular elastic seal material is detachably fitted is formed on a width surface of the ring member and / or the inner ring that contacts the elastic seal material. . 3. An annular second elastic sealing material that is elastically deformed and abutted against both opposing width surfaces of the inner ring and the ring member is integrally fixed to a peripheral portion on the inner diameter side of the annular spacer. The bearing device for railway vehicles as described. 4. The second step portion into which the second elastic seal material is detachably fitted is formed on a width surface of the ring member and / or the inner ring that comes into contact with the second elastic seal material. The bearing device for railway vehicles as described. The railcar bearing device according to any one of claims 1 to 4, wherein the spacer is a copper alloy thin plate having means for retaining a lubricant in oil. The rolling bearing device according to claim 1, wherein the rolling bearing is a double row tapered roller bearing.

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