JP2006029475A - Combined rolling bearing for axle shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined rolling bearing for an axle shaft which can sufficiently improve not only quake-proof impact properties but also collar-proof seizure properties, while preventing roller skews, smearing or slip scratches and conical rollers in both sides line are loaded by such combined radial and thrust loads as chiefly radial loads and axial loads and cylindrical rollers or barrel shape rollers or balls in the center line can support not only radial loads but also axial loads in order to freely rotatably bolster the axle shaft for rolling stock based on a scheme of high load capacity that loads mainly radial loads. <P>SOLUTION: Sealing three lines combined rolling bearings for the axle shaft of rolling stock comprises all-in-one type outer race 2, three single line inner races 3a, 3a, 3b, conical rollers 5, 5 in both side lines trimmed and formed meanwhile, two holders 10, 10 guided by the conical roller 5 by keeping a prescribed clearance between the conical roller 5 and the conical roller 5, cylindrical rollers 21 trimmed and formed in the center line, the outer race 2, inner races 3a, ... by keeping a prescribed clearance between the cylindrical roller 21 and the cylindrical roller 21 or one of holders 31 guided by the cylindrical roller 21, two oil throwers 11, 11 having a seal wearing function to fix to the inner race 3a, 3a both sides, and two seal members 12, 12 to fix to both sides of the outer race 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The combined rolling bearing for an axle according to the present invention is particularly used for rotatably supporting a rotating shaft that is incorporated in an axle of a railway vehicle and is subjected to a vibration shock load from a track or the like during use. Yes. In particular, the present invention has sufficient wear resistance, high speed, heat resistance, and seizure resistance even under relatively high speed rotation conditions, even when high loads, fluctuating loads, composite loads, etc. are applied. In addition, it is possible to suppress the occurrence of fretting (stamp scratches) on the axle and to be suitably used for a railcar axle that requires ease of handling such as assembly, inspection, and maintenance. In addition, it can be applied to axles other than railway vehicles.

  A rolling bearing for an axle of a railway vehicle is applied with an axial load in addition to a radial load at the time of use, and a vibration impact load is constantly applied from a track or the like. Therefore, in order to rotatably support the axle, not only radial load but also axial load can be supported, so that not only vibration impact resistance but also rolling bearing having high speed, low heat generation and wear resistance. It is requested.

  For this purpose, conventionally, the outer ring as shown in FIG. 5 is an integral type, the inner ring is two, the double row tapered roller bearing combining the spacer in the middle, or the two outer rings as shown in FIG. A double row cylindrical roller bearing in which an inner ring is integrated with a spacer in the middle is often used.

  FIG. 5 is a longitudinal sectional view (actual product) of a conventional sealed double-row tapered roller bearing for railcar axles.

  The axle 1 is equipped with a sealed double-row tapered roller bearing, and includes an integrated outer ring 2 and a pair of inner rings 3a and 3a separated into two. A spacer 4 is provided between the pair of inner rings 3a, 3a. Double-row tapered rollers 5 and 5 are interposed between the outer ring 2 and the pair of inner rings 3a and 3a, respectively. Also, cages 10 and 10 for these tapered rollers 5 and 5 are provided, and on both sides of the pair of inner rings 3a and 3a, collar rings (oil drains) 11 and 11 are mounted. On both sides, a pair of annular seal members 12, 12 are provided.

  FIG. 6 is a longitudinal sectional view (actual product) of a conventional open type double row cylindrical roller bearing for railway vehicle axles.

  The axle 1 is provided with an open type double row cylindrical roller bearing, and includes a pair of outer rings 2a and 2a separated into two parts, and an integrated inner ring 3. A spacer 4 is provided between the pair of outer rings 2a, 2a. Between the outer rings 2a and 2a and the inner ring 3, double-row cylindrical rollers 6 and 6 are interposed so as to roll freely. Also, cages 10 and 10 for the cylindrical rollers 6 and 6 are provided, and a collar 13 is mounted on one side of the inner ring 3.

  By the way, the above-mentioned double-row tapered roller bearing for an axle (FIG. 5) can carry a radial load and an axial load either alone or simultaneously. However, since the cross-sectional height in the bearing radial direction is limited, the roller length is as long as possible to ensure a certain load or more, and is almost more than twice the roller diameter. For this reason, roller skew is likely to occur, smearing or slip damage is likely to occur, and problems such as seizure occur by chance.

  On the other hand, the double-row cylindrical roller bearing for an axle described above (Fig. 6) is generally used as a radial receiver, and can receive a light axial load, but when receiving a large axial load, In general, it must be used in combination with tapered rollers or ball bearings, which limits the size of the bogie bearing housing (housing).

  In addition, now that the cart is pursuing more compact, higher speed, and higher load, the bearings are naturally smaller in size, higher speed, higher load capacity and longer life. It is requested.

  Therefore, the present invention, as a solution to the problems existing in the above-mentioned existing various types of double-row tapered roller bearings for railcar axles and double-row cylindrical roller bearings, A hermetically sealed three-row combination rolling bearing composed of a row of cylindrical or barrel rollers or balls in between the two rows is proposed.

  In the present invention, with the above-described structural features, the outer ring is integrated and easily assembled into the housing (bearing box) of the vehicle body, and the tapered rollers in the both side rows are mainly referred to as radial load and axial load. The center row cylindrical roller or barrel roller or ball is loaded with a composite load and is a mechanism with a high load capacity that mainly applies a radial load, so that the railcar axle can be supported rotatably. In addition to radial load, it can also support axial load, roller skew and smearing, or slip damage can be suppressed, and not only vibration impact resistance, but also improved seizure resistance can be improved sufficiently. The purpose is to provide.

In order to achieve the above object, a combined rolling bearing for an axle according to claim 1 of the present invention includes an integral outer ring,
Two or three inner rings,
Two rows of tapered rollers interposed between the inner and outer rings,
Arranged in the central row between the two rows of tapered rollers, in one row, any one of cylindrical rollers, barrel rollers, and balls,
It is characterized by comprising.

The axle combined rolling bearing according to claim 2 of the present invention is provided with two cages that are guided by the tapered rollers while maintaining a constant interval between the tapered rollers,
It is guided by any one of the inner and outer rings, or the cylindrical roller, barrel roller, and ball, with a constant interval between any one of the cylindrical roller, barrel roller, and ball. One cage,
Two oil drainers with seal wear ring function attached to both sides of the inner ring,
Two sealing members attached to both sides of the outer ring;
Is further provided.

[Action]
In the present invention, since the outer ring is of a body shape, it is not only easy to be assembled in the housing (bearing box) of the vehicle body, but also has high rigidity and a reasonable structure. In addition, the inner ring has two or three inner rings, but the three rows are divided by the load in proportion to suppress the occurrence of bending of the axle rotating while being loaded, and the inner ring inner surface. It is possible to prevent the occurrence of scratches due to fretting of the shaft due to the minute sliding in the axial direction with the connecting and engaging portion. Furthermore, the tapered rollers of the both side rows can be made shorter, and the ratio of the roller diameter and the length can be set to 0.5 to 1.0, and the occurrence of skew of the tapered rollers can be suppressed.

  A sealed three-row combined rolling bearing for railway vehicle axles according to the present invention is a sealed three-row combined rolling bearing in which an outer ring is integrated, an inner ring is three single rows, both side rows are tapered rollers, and a center row is cylindrical rollers. Yes, the second is a sealed three-row combined rolling bearing with one outer ring, two inner rings, single and double rows, tapered rollers on both sides, and cylindrical rollers on the center row, and the third is an integrated outer ring Sealed three-row combined rolling bearing with three single rows of inner rings, tapered rollers on both sides and barrel rollers on the center row. Fourth, the outer ring is integrated, the inner ring is three single rows, and both sides are conical. The roller is a sealed three-row combination rolling bearing in which the center row is a ball.

  In the sealed three-row combined rolling bearing for an axle of the present invention configured as described above, the outer ring is an integral type and is easily assembled in the housing (bearing box) of the vehicle body. The cylindrical roller or barrel roller or ball in the center row shares a part of the radial load, and the tapered rollers in the double row bear a composite load of a relatively small radial load and axial load. Thus, the roller skew and smearing or sliding scratches can be well suppressed.

  In addition, since the center row is also loaded, the occurrence of bending of the axle rotating while being loaded is suppressed, and flaws due to fretting of the shaft due to minute sliding in the axial direction with the chamfered contact portion of the inner ring inner diameter surface are generated. Will be prevented. In addition, since there is a center row, the tendency to increase the axial gap of the bearing can be suppressed, and not only the vibration shock resistance but also the seizure resistance of the bearing can be improved.

  As described above, according to the present invention, the load capacity of the bearing is increased, and the impact resistance, wear resistance, high speed, heat resistance and seizure resistance can be dramatically improved. In particular, as a result of realizing a structure that can withstand a combined load due to a radial load and an axial load that are simultaneously applied, it can be widely used in various rotating support portions that are operated under severe conditions such as a railway vehicle axle.

  In addition, because there is a central row, both side rows and the central row are simultaneously loaded in proportion, so the occurrence of bending of the rotating axle while being loaded during operation can be suppressed, and the axle surface that fits with the bearing inner ring is the inner ring inner diameter. Prevention of fretting flaws due to micro sliding in the axial direction with the chamfered contact portion of the surface can be sufficiently expected.

  Furthermore, the bearing of the present invention is quite effective when used in a railway vehicle axle that requires simple handling and easy handling such as assembly, inspection, and maintenance.

  Hereinafter, a sealed three-row combined rolling bearing for a railcar axle according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a sealed three-row combined rolling bearing for a railway vehicle axle according to a first embodiment of the present invention.

  The bearing according to the first embodiment is a sealed three-row combined rolling bearing for a railway vehicle axle. This bearing has a body-shaped outer ring 2, three single-row inner rings 3 a, 3 a, 3 b, both side rows of tapered rollers 5, 5 interposed therebetween, and between the tapered rollers 5 and the tapered rollers 5. Two cages 10 and 10 which are held at a constant interval and guided to the tapered roller 5, a cylindrical roller 21 interposed in the center row, and a gap between the cylindrical roller 21 and the cylindrical roller 21 at a constant interval. One retainer 31 that is held and guided by the inner and outer rings 2, 3 a... Or the cylindrical roller 21, and two oil drainers 11 and 11 having seal wear ring functions that are attached to both sides of the inner rings 3 a and 3 a, And two seal members 12 and 12 attached to both sides of the outer ring 2.

  The outer ring 2 is an integral type and is easily assembled in a housing (bearing box) of the vehicle body. Further, the tapered rollers 5 and 5 on both side rows mainly apply a radial load and also an axial load, and the cylindrical rollers 21 on the center row mainly apply a radial load. The cylindrical rollers 21 in the center row share a part of the radial load, and the tapered rollers 5 and 5 in the both rows may have a smaller load capacity. Therefore, the length of the tapered rollers 5 and 5 can be shortened. Thus, roller skew and smearing or slipping can be well suppressed.

  In addition, since the center row is also loaded, it is possible to suppress the occurrence of bending of the axle 1 rotating while being loaded, and to prevent damage caused by fretting of the shaft due to minute sliding in the axial direction with the chamfered contact portion of the inner ring inner surface. Occurrence can be prevented. In addition, since there exists a center row | line, the increase tendency of the axial clearance gap of a bearing can be suppressed, and not only the vibration impact resistance of a bearing but a seizure resistance can be improved.

(Second Embodiment)
FIG. 2 is a longitudinal sectional view of a sealed three-row combined rolling bearing for a railway vehicle axle according to a second embodiment of the present invention.

  The basic structure of this embodiment is the same as that of the first embodiment described above, and only differences will be described.

  The bearing according to the second embodiment is a sealed three-row combined rolling bearing for a railway vehicle axle. The inner ring of this bearing consists of two, and includes a single row of inner rings 3a and a double row of inner rings 3c. Other configurations are the same as those in the first embodiment.

  The function of this bearing is that the inner rings are two single-row and double-row inner rings 3a, 3c, and the stagnation of the axle 1 is suppressed from the other embodiments, and the inner ring inner surface is chamfered with the chamfered joint portion. Generation of flaws due to fretting of the shaft due to minute sliding in the axial direction can be prevented. The rest is the same as in the first embodiment, and a detailed description is omitted.

(Third embodiment)
FIG. 3 is a longitudinal sectional view of a sealed three-row combined rolling bearing for a railcar axle according to a third embodiment of the present invention.

  The basic structure of this embodiment is the same as that of the first embodiment described above, and only differences will be described.

  The bearing according to the third embodiment is a sealed three-row combined rolling bearing for a railway vehicle axle. This bearing is provided with a barrel roller 22 capable of self-alignment in the center row, and is also provided with a cage 32 for the barrel roller 22. Other configurations are the same as those in the first embodiment.

  The function of this bearing is the barrel roller 22 in which the center row can be self-aligned. From the first and second embodiments, a constant axial load can be applied, and the radial clearances on both sides row are uneven or Generation of edge funnels of the barrel rollers 22 in the center row due to the axial load can be suppressed. The rest is the same as in the first embodiment, and a detailed description is omitted.

(Fourth embodiment)
FIG. 4 is a longitudinal sectional view of a sealed three-row combined rolling bearing for a railway vehicle axle according to a fourth embodiment of the present invention.

  The basic structure of this embodiment is the same as that of the first embodiment described above, and only differences will be described.

  The bearing according to the fourth embodiment is a sealed three-row combined rolling bearing for a railway vehicle axle. This bearing is provided with a ball 23 as a rolling element in a central row, and is also provided with a cage 33 for this ball 23. Other configurations are the same as those in the first embodiment.

  The function of this bearing is the ball 23 in the center row, and a constant axial load can be applied from the first and second embodiments. The rest is the same as in the first embodiment, and a detailed description is omitted.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

1 is a longitudinal sectional view of a sealed three-row combined rolling bearing for a railway vehicle axle according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the sealing three-row combination rolling bearing for railcar axles concerning 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the sealing 3 row | line combination rolling bearing for railcar axles concerning 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the seal | sticker three-row combination rolling bearing for railcar axles concerning 4th Embodiment of this invention. It is a longitudinal cross-sectional view (result product) of the sealed double row tapered roller bearing for railcar axles concerning the past. It is a longitudinal cross-sectional view (result product) of the open type double row cylindrical roller bearing for railway vehicle axles concerning the former.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle 2 Outer ring 3a Inner ring 3b Inner ring 3c Inner ring 4 Spacer 5 Conical roller 6 Cylindrical roller 7 Ball 10 Cage 11 Hook 12 Seal member 21 Cylindrical roller 22 Barrel roller 23 Ball 31 Cage 32 Cage 33 Cage 33

Claims (2)

An integrated outer ring,
Two or three inner rings,
Two rows of tapered rollers interposed between the inner and outer rings,
Arranged in the central row between the two rows of tapered rollers, in one row, any one of cylindrical rollers, barrel rollers, and balls,
A combined rolling bearing for an axle characterized by comprising: Two cages that are guided by the tapered rollers by holding the tapered rollers at a constant interval;
It is guided by any one of the inner and outer rings, or the cylindrical roller, barrel roller, and ball, with a constant interval between any one of the cylindrical roller, barrel roller, and ball. One cage,
Two oil drainers with seal wear ring function attached to both sides of the inner ring,
Two sealing members attached to both sides of the outer ring;
The combined rolling bearing for an axle according to claim 1, further comprising:

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