JP4019513B2 - Railway vehicle bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing device used for an axle or the like of a railway vehicle, and more particularly to a railway vehicle bearing device provided with a sealing structure that prevents foreign matter from entering the inside of the bearing.
[0002]
[Prior art]
An axle bearing device for a railway vehicle has a configuration as shown in FIG. 1, for example, and a cylindrical rear lid 3 that abuts against both ends of the bearing 1 and the inner ring 2 of the bearing 1 from the axial direction. And an oil drainer 4. Reference numeral 11 represents an axle.
[0003]
In FIG. 1, a double row tapered roller bearing is shown as an example of a bearing, and includes an integrated outer ring 5, an inner ring 2 and an inner ring spacer 6 that are divided separately in each row. Reference numeral 7 represents a roller, and reference numeral 8 represents a cage.
[0004]
Further, a cylindrical seal case 9 is disposed so as to cover the outer diameter surface of the contact portion between the inner ring 2, the rear lid 3 and the oil drain 4, and one end portion on the bearing side of the cylindrical seal case 9 is The outer ring 5 is fitted and fixed. An oil seal 10 is attached to the inner peripheral portion of the seal case 9. The inner diameter side of the oil seal 10 is in sliding contact with the outer sliding surface of the rear lid 3 and the oil drain 4 attached to the axle 11 to seal the inside of the bearing from the outside.
[0005]
[Problems to be solved by the invention]
Railway vehicle bearing devices are mostly outboard types, and when subjected to a load, the axle 11 becomes more bent toward the shaft end. When the wheel rotates in this state, stress fluctuations and micro-slip due to repeated stress occur on the contact surface A between the end surface of the inner ring 2 and the rear lids 3, 4, and fretting wear occurs on the contact surface A. As a result, the wear powder (iron powder or iron oxide) made of the material of the inner ring 2, the rear lid 3 or the oil drainer 4 may be mixed into the grease in the bearing 1 to promote deterioration and adversely affect the bearing performance. there were.
[0006]
The present invention has been made paying attention to the above problems, and stress generated between the inner ring and the rear cover while suppressing the generation of iron powder from the contact surfaces of the inner ring and the rear cover. An object of the present invention is to provide a railway vehicle bearing device capable of prolonging the life of grease in the bearing by actively utilizing fluctuations and microslip.
[0007]
Here, conventionally, for example, as described in Japanese Patent Application Laid-Open No. 9-72344, a stress absorber is provided between the oil drainer or the rear lid and the inner ring end face, and the inner ring end face and the rear lid are provided. To prevent the generation of iron wear powder from the contact surface, etc., or as described in Japanese Patent Laid-Open No. 8-128451, a lubricant is interposed between the oil drain or the rear lid and the inner ring end surface. It has been proposed to prevent the fine iron wear powder generated by the contact between the inner ring end face and the rear lid or the oil drain from entering the grease in the bearing by suppressing the oil drain and the abrasion of the rear lid. However, it has a different purpose from the present invention.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a railway vehicle bearing device according to claim 1 of the present invention includes:
With grease is used as lubricant, in railway VEHICLE bearing device back cover or oil thrower from the axial direction to constitute the sealing structure in contact with respect to the inner race end surface of the bearing,
At least one of the inner ring end face and the rear cover and between the inner ring end face and the oil drain is inserted with a powder generator that is made of a material that extends the grease life in the bearing and generates the material powder by wear. The rear lid or the oil drainer comes into contact with the end surface of the inner ring from the axial direction through the powder generator .
The invention described in claim 2 is characterized in that, in the configuration described in claim 1, an oil-containing felt is arranged on the inner diameter side of the arrangement position of the powder generator.
[0009]
Here, copper and organic copper compounds (such as copper carbamate, copper stearate, and copper naphthinate) are known as materials for extending the grease life. Copper may use copper itself or may be used in the form of a copper composite resin.
[0010]
Further, the insertion can be realized by mounting or coating a material for extending the grease life (hereinafter also referred to as a copper powder generator) on one or both of the contact surfaces.
[0011]
Furthermore, it is preferable that a gap is provided in a portion directly facing in the axial direction between the inner ring end face and the rear lid and between the inner ring end face and the oil drain without the copper or the like being interposed. . In this way, the generation of iron powder and the like is suppressed.
[0012]
[Action]
The axle bends as the bearing load increases. For this reason, a compressive force acts on the deflection center side portion of the copper that extends the life of the grease disposed between the inner ring and the rear lid or the oil drainer.
[0013]
When the wheel rotates as it is, the pressure phase applied to the component moves along with the change in the deflection phase of the axle. The compressive force during running is generated during the rotation cycle and that generated by running vibration. These actions cause stress fluctuations and micro-slip in copper, and part of the copper powder generator becomes powdery. . Since the outer diameter side of the copper powder generator is placed in the bearing sealing device, the wear powder from the copper powder generator penetrates into the bearing due to centrifugal force etc. and enters the grease. Rotates the bearing, for example, from the wheel side roller train to the shaft end side roller train, so that the wear powder is dispersed together with the grease over the entire bearing, thereby extending the life of the grease.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing the bearing device of the present embodiment.
[0015]
Here, since the basic structure of the railway vehicle bearing device of the present embodiment is the same as the conventional structure, the entire structure will be omitted with reference to FIG. 1, and the embodiment of the present invention will be described. The structure of only the part required for doing is shown in figure. It should be noted that the same parts and the like as in the conventional example will be described with the same reference numerals.
[0016]
In the first embodiment, as shown in FIG. 2, a groove 20 is formed on the contact surface of the rear lid 3 that faces the end surface of the inner ring 2 in the axial direction. The groove 20 is formed in an annular shape along the circumferential direction.
[0017]
An annular copper plate 21 is attached to the annular groove 20 by fitting or the like. Instead of the copper plate 21, a copper-added resin or a resin containing copper wire may be used. As the resin, a Teflon resin, a fluororesin, or the like that does not cause a problem even if it enters the bearing is used. In the following description, the copper plate 21 and the copper-added resin are referred to as a copper powder generator.
[0018]
The annular copper powder generator 21 has the same width as the groove 20 but is thicker than the depth of the groove 20 so that it protrudes from the contact surface of the rear lid 3 toward the inner ring 2 side. It has become a state.
[0019]
As a result, the copper powder generating body 21 is inserted between the end face of the inner ring 2 and the rear lid 3 so that the end face of the inner ring 2 and the rear lid 3 are not in direct contact with the gap δ.
[0020]
Here, the annular copper powder generator 21 has a large area so as to increase the area in contact with the end face of the inner ring 2.
Next, the operation and the like of the bearing device having the above configuration will be described.
[0021]
By rotating with a large bending moment applied to the axle, a stress is repeatedly applied between the end surface of the inner ring 2 and the copper powder generating body 21 attached to the rear cover 33, and a slight slip is caused on the contact surface. Arise. Although fretting wear occurs due to micro-slip, since the copper powder generator 21 has a lower hardness than the inner ring 2, fretting wear occurs mainly in the copper powder generator 21. The copper powder as the wear powder moves outward in the radial direction by the centrifugal force generated by the rotation of the axle 11, moves into the bearing through the sealing device, and mixes with the grease. Since the grease inside the bearing circulates from the wheel side roller train to the shaft end side roller train due to the rotation of the bearing, the copper powder is dispersed along with the grease throughout the bearing, extending the life of the grease, that is, Performance can be maintained for a long time.
[0022]
In addition, since the inner ring 2 and the rear lid 3 are in a non-contact state, wear between the two and the three is prevented, and deterioration of the lubricant due to iron powder or the like being mixed into the grease is also prevented. It can be suppressed.
[0023]
Here, in the said embodiment, although demonstrated by the example which inserted the copper powder generating body 21 only between the inner ring | wheel 2 and the rear cover 3, copper powder generation | occurrence | production also between the inner ring | wheel 2 and the oil drainer 4 is demonstrated. The body 21 may be inserted.
[0024]
Alternatively, an annular groove may be provided on the end face side of the inner ring 2 to fix other annular copper powder generators so that the copper powder generators come into contact with each other. Alternatively, an annular groove 20 may be provided on the end face side of the inner ring 2 so that the protruding portion of the copper powder generating body 21 attached to the rear lid 3 is fitted into the groove 20 of the inner ring 2.
[0025]
Moreover, the width of the part which protrudes from the groove | channel 20 in the copper powder generation body 21 may be set wide, and the sliding contact area of the copper powder generation body 21 may be enlarged further.
The grooves 20 do not necessarily have an annular shape. For example, a plurality of grooves 20 for attaching the copper powder generator 21 are provided at predetermined intervals along the circumferential direction. A plurality of mounting protrusions that can be fitted in the plurality of grooves 20 may be provided. In this case, the swinging of the copper powder generator 21 in the circumferential direction is prevented. In short, the structure of the groove 20 is sufficient if the copper powder generator 21 is attached. Also, the copper powder generator 21 itself does not have to be annular, and a plurality of copper powder generators may be provided at predetermined intervals along the circumferential direction.
[0026]
Moreover, in the said embodiment, although demonstrated by the example inserted by attaching the copper powder generator 21, you may coat copper to the end surface of the inner ring | wheel 2 or the rear cover 3 by copper plating, thermal spraying, etc. . However, in terms of maintenance, the above attachment is advantageous because it is easy to replace.
[0027]
Further, the rear lid 3 may be divided as shown in FIG. The same applies to other embodiments. By dividing the rear lid 3 in this way, the replacement of wear or the like becomes only the 3a portion.
[0028]
Next, a second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the components similar to the said 1st Embodiment, and the detail is abbreviate | omitted.
The basic configuration of this embodiment is the same as that of the first embodiment. However, the width of the copper powder generator 21 is reduced, oil or oil-impregnated felt 22 is provided on the inner diameter side of the copper powder generator 21, the amount of copper powder generated is controlled, and the copper powder with respect to the bearing usage time The amount of generation is set to a very small amount so that the copper powder generation time is long. Further, the felt may be resin-based.
[0029]
Here, the oil-impregnated filter 22 is not used in a strongly compressed state (in order to make the oil impregnated), and the oil has a viscosity. In the case of a low-viscosity oil, the rotation and vibration of the vehicle, Although it may be lost in a short time due to impact, in the case of a high viscosity oil, it has good retention and can be used for a long time. The oil from the oil impregnated filter 22 on the inner diameter side is supplied between the copper powder generator 21 and the inner ring 2 for a long period of time, so that the wear between them is limited and the amount of copper powder generated is controlled. Is done.
[0030]
Since the oil impregnated felt 22 is provided on the inner diameter side, the copper powder from the copper powder generator 21 does not become an obstacle to the movement into the bearing.
Further, the oil impregnated felt 22 is provided on the outer diameter side of the copper powder generator 21 and has a communication part (opening or the like) to the bearing side (outer diameter side), and is generated in the copper powder generator 21. Only a part of the wear powder may move inside the bearing, and the amount of grease mixed in may be adjusted to an appropriate amount.
[0031]
Other configurations, operations and effects are the same as those in the first embodiment.
Next, a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the components similar to the said 1st Embodiment, and the detail is abbreviate | omitted.
[0032]
The basic configuration of this embodiment is the same as that of the first embodiment. However, this is an example in which the groove 23 is provided on the end face on the inner ring 2 side and the copper powder generator 21 is attached.
The configuration, operation, and effect are the same as in the other embodiments.
[0033]
Next, a fourth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the components similar to the said 1st Embodiment, and the detail is abbreviate | omitted.
In the present embodiment, the copper powder generator is a sleeve 24 that covers the outer peripheral surface and end surfaces of the rear lid 3 and the oil drainer 4.
[0034]
The configuration, operation, and effect are the same as in the other embodiments.
In all the above embodiments, the example of the tapered roller bearing is described as the type of bearing, but other rolling bearing types such as a cylindrical roller bearing may be used.
[0035]
【Example】
As a result of a 1000 hour endurance test using a bearing device that does not include the copper powder generator 21, the sliding portion in the bearing was worn by 0.3 mm due to poor lubrication (cage guide surface). As a result of a 1000 hour endurance test using the bearing device with the mark, the wear (cage guide surface) at the sliding portion in the bearing was significantly improved to 0.01 mm.
[0036]
【The invention's effect】
As described above, there is an effect that not only the mixing of iron wear powder can be suppressed, but also the grease life can be proactively extended.
[0037]
Thereby, it becomes possible to extend the interval of the maintenance inspection period by maintaining the performance of the bearing for a long time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining the structure of a conventional railway vehicle bearing device.
FIG. 2 is a diagram for explaining the structure according to the first embodiment of the present invention.
FIG. 3 is a diagram for explaining another structure according to the first embodiment of the present invention.
FIG. 4 is a diagram for explaining a structure according to a second embodiment of the present invention.
FIG. 5 is a diagram for explaining a structure according to a third embodiment of the present invention.
FIG. 6 is a diagram for explaining a structure according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Rear cover 4 Oil drain 20 Groove 21 Copper powder generating body 24 Sleeve

Claims (2)

With grease is used as lubricant, in railway VEHICLE bearing device back cover or oil thrower from the axial direction to constitute the sealing structure in contact with respect to the inner race end surface of the bearing,
At least one of the inner ring end face and the rear cover and between the inner ring end face and the oil drain is inserted with a powder generator that is made of a material that extends the grease life in the bearing and generates the material powder by wear. The railcar bearing device is characterized in that a rear lid or a drainer comes into contact with the end surface of the inner ring from the axial direction through the powder generator . The bearing device for a railway vehicle according to claim 1, wherein an oil-containing felt is disposed closer to the inner diameter side than the position where the powder generator is disposed.

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