JP3779044B2 - Axle bearing unit for railway vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axle bearing unit for a railway vehicle used for an axle of a railway vehicle.
[0002]
[Prior art]
In an axle bearing unit of a railway vehicle, as shown in FIG. 5, an inner ring 53 and an annular oil drain 54 of an axle bearing 52 are arranged on the axle 51 from the large-diameter side to the shaft end side and are externally fitted. A front lid 55 is screwed into a male screw portion 51 a provided at the shaft end, and the inner ring 53 of the axle bearing 52 is fixed to the axle 51. In addition, a disc spring 56 is interposed between the front lid 55 and the oil drain 54 to prevent the front lid 55 from loosening and coming off the axle 51 due to vibration during traveling of the vehicle.
[0003]
[Problems to be solved by the invention]
In such an axle bearing unit, since the disc spring 56 is interposed between the front lid 55 and the oil drain 54 in a compressed state, when the front lid 55 is screwed into the male thread portion 51a of the axle 51, the tightening torque thereof is Although it becomes large, the tightening operation is not so difficult due to the antirust oil adhering to the oil drain 54, the front lid 55, and the disc spring 56, and the like.
However, when it is necessary to replace the bearing or the like, when it is attempted to disassemble, the rust preventive oil or the like is lost, so that sticking occurs at the contact portion of the disc spring 56 with the front lid 55 or the oil drain 54. At the same time, since the rotational torque of the male threaded portion 51a of the axle 51 is also heavy, the loosening torque of the front lid 55 becomes extremely large, and there may be a situation where the axle bearing unit cannot be disassembled.
[0004]
An object of the present invention is to provide an axle bearing unit for a railway vehicle that can solve such problems and can easily perform a disassembly work after use.
[0005]
[Means for Solving the Problems]
An axle bearing unit for a railway vehicle according to the present invention is configured such that an inner ring and an annular oil drain of an axle bearing are juxtaposed from an axle large-diameter portion side to an axle end side and externally fitted to an axle, and screwed into a male screw portion provided at the axle end of the axle The present invention is applied to a railway vehicle axle bearing unit in which a disc spring is interposed between the front lid and the oil drainer and the inner lid of the axle bearing is fixed to the axle by screwing the front lid. In the axle bearing unit of this premise construction, before Kisara spring, the dish set lubricant reservoir to refuel the contact portion between the front cover and oil thrower spring only, the surface of the lubricant reservoir portion is conical spring consisted of a plurality of grooves intersecting eyes formed in, fill the lubricant in the lubricant reservoir portion of this. The lubricant reservoir may be composed of a plurality of depressions formed in a distributed manner on the surface of the disc spring.
As this, by filling the lubricant is provided a lubricant reservoir, and the contact portion between the front cover and oil thrower disc spring, the male screw portion of the axle, lubricant or oil is supplied, prolonged Oil shortage is prevented by use. Therefore, loosening torque of front cover is reduced, Ru can be easily performed disassembly of the axle bearing unit after use. Moreover, the lubricant reservoir can be easily formed by using the lubricant reservoir as the above-described minute groove or recess.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An example of a proposal that is the basis of the present invention will be described with reference to FIG. This axle bearing unit is used for an axle of a railway vehicle. As shown in FIG. 1 (A), the rear lid 7, the inner ring 2 of the axle bearing 1, and the annular oil drain 8 are connected to the large diameter of the axle 11. Lined up from the part side to the shaft end side and fitted. A disc spring 10 is interposed between the front lid 9 screwed into a male threaded portion 11a provided at the shaft end of the axle 11 and the oil drain 8, and the front lid 9 is screwed in so that the inner ring 2 of the axle bearing 1 becomes the axle. 11 is fixed. The axle bearing 1 is composed of a roller bearing, more specifically, a double row cylindrical roller bearing, and includes an inner ring 2 with no flange, an outer ring 3 with a central flange, rollers 4 and 4 in each row, and cages 5 in each row. And 5.
[0007]
The rear cover 7 is attached to the axle 11 on the center side of the axle bearing 1 and has an oil seal 12 slidably contacted on the outer periphery. The oil seal 12 is attached to the outer ring 3 so as to protrude in the width direction. The seal cover 13 is attached to the inner periphery. The rear lid 7 is provided with ventilation paths 14 and 15 that open from the outer diameter surface to the inner diameter surface, and an air vent 16 is provided at the outlet of one of the ventilation paths 14. The other air passage 15 communicates the inner diameter side of the rear lid 7 with the closed space surrounded by the seal cover 13 and the oil seal 12.
The oil drain 8 is attached to the axle 11 so that the oil seal 17 is slidably contacted on the outer periphery. The oil seal 17 is attached to the inner periphery of a ring-shaped seal cover 18 attached to the outer ring 3 so as to protrude in the width direction. It has been. The oil seal 17 forms a labyrinth seal on the outer periphery of the front lid 9 that is screwed into the male thread portion 11 a of the axle 11.
[0008]
This railcar axle bearing unit is an axle bearing unit of this premise structure, as shown in FIGS. 1 (B) and 1 (C), the inner diameter of one surface contacting the front lid 9 of the disc spring 10 as indicated by hatching. Are provided with lubricant reservoir portions 19A and 19B for supplying oil to these contact portions, respectively, and the outer diameter portion of the other surface that comes into contact with the oil drain 8 of the disc spring 10 and the lubricant reservoir portions 19A and 19B. It is filled with a lubricant. As the lubricant, grease, lubricating oil, grease containing a high molecular polymer, other solid lubricants, and the like are used.
[0009]
First embodiment of this invention, or lubricants reservoir 19A, and a 19B, instead of those of the configuration of FIG. 1, as indicated by cross-hatching in FIG. 2, in contact with the oil thrower 8 and the front lid 9 It is assumed that it consists of a large number of minute grooves at the intersection formed on the surface of the disc spring 10. As shown in FIG. 3, it may be formed of depressions distributed and formed on the surface of the disc spring 10 that contacts the oil drain 8 or the front lid 9. The lubricant reservoirs 19A and 19B at the intersections in FIG. 2 are obtained by knurling or the like. Lubricant reservoirs 19 </ b> A and 19 </ b> B can be easily formed by using such minute grooves and depressions.
[0010]
According to the axle bearing unit having this configuration, lubricant reservoirs 19A and 19B are provided on one side of the disc spring 10 that contacts the oil drain 8 and the other side of the disc spring 10 that contacts the front lid 9, respectively, for lubrication. Since the lubricant is filled, the contact between the disc spring 10 and the oil drain 8 and the contact portion between the disc spring 10 and the front lid 9 are prevented from running out of oil due to the lubricant retaining effect. The oil component is also supplied to the male screw portion 11 a of the axle 11. For this reason, the contact portion of the disc spring 10 with the oil drain 8 and the front lid 9 does not stick due to long-term use, and the loosening torque of the front lid 9 screwed into the male threaded portion 11a of the axle 11 is reduced. The operation of loosening the lid 9 and disassembling the axle bearing unit can be easily performed.
[0011]
FIG. 4 shows another reference proposal example . In this example, in the axle bearing unit shown in FIG. 1, lubricant reservoirs are respectively provided on the inner diameter portion of the end surface of the front lid 9 that contacts the disc spring 10 and the outer diameter portion of the oil drain 8 that contacts the disc spring 10. The portions 19A and 19B are provided and filled with a lubricant. Other configurations are the same as the example of FIG.
As described above, even when the lubricant reservoirs 19A and 19B are provided on the end faces of the front lid 9 and the oil drainer 8, the retaining effect of the lubricant can be obtained, and the oil drainer 8, the front lid 9 and the disc spring 10 can be obtained by long-term use. Can be prevented and the disassembling work can be easily performed.
[0012]
【The invention's effect】
Axle bearing unit for a railway vehicle of the invention, the roots if dish is interposed between the front cover and the oil thrower, due to the provision of the lubricant reservoir portion to be fed between the contact portion between the front cover and oil thrower disc springs, that Due to the lubricant retention effect, the contact part between the front cover of the disc spring and the oil drainer is prevented from running out of oil even after long-term use, and the lubricant is also applied to the male threaded part of the axle to which the front cover is screwed. For this reason, the disassembly work after use can be easily performed.
Since the lubricant reservoir is composed of a plurality of crossed grooves formed on the surface of the disc spring or a plurality of depressions distributed on the surface of the disc spring, the lubricant reservoir can be easily formed. Can be formed.
[Brief description of the drawings]
1A is a cross-sectional view of an axle bearing unit according to a proposal example as a basis of the present invention, FIG. 1B is a plan view of a disc spring in the unit, and FIG. 1C is a back view of the disc spring. .
2 is a front view showing the roots if pan in an embodiment of the present invention.
FIG. 3 is a front view showing still another example of a disc spring.
FIG. 4 is a partial cross-sectional view of an axle bearing unit according to another reference proposal example .
FIG. 5 is a cross-sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Axle bearing 10 ... Belleville spring 2 ... Inner ring 11 ... Axle 8 ... Oil drain 11a ... Male screw part 9 ... Front lid 19A, 19B ... Lubricant reservoir part

Claims (2)

The inner ring and annular oil drain of the axle bearing are aligned on the axle from the axle large diameter portion side to the shaft end side and externally fitted, and between the front lid that is screwed into the male screw portion provided at the axle end of the axle and the oil drain. the disc spring is interposed, the oil supply in the axle bearing unit for a railway vehicle for fixing the inner ring of the axle bearing axle by screwing the front cover, the disc spring, the contact portion between the front cover and oil thrower of the disc springs A railroad vehicle axle bearing unit in which a lubricant reservoir is provided, the lubricant reservoir is composed of a plurality of intersecting grooves formed on the surface of the disc spring, and the lubricant reservoir is filled with lubricant. The inner ring and annular oil drain of the axle bearing are aligned on the axle from the axle large diameter portion side to the shaft end side and externally fitted, and between the front lid that is screwed into the male screw portion provided at the axle end of the axle and the oil drain. In an axle bearing unit for a railway vehicle in which a disc spring is interposed and the front lid is screwed to fix an inner ring of an axle bearing to an axle, the disc spring is supplied with oil at a contact portion between the disc lid and the front lid and the oil drainer. An axle bearing unit for a railway vehicle in which a lubricant reservoir portion is provided, the lubricant reservoir portion is composed of a plurality of depressions dispersedly formed on the surface of the disc spring, and the lubricant reservoir portion is filled with a lubricant .

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