JP2012172777A - Rolling bearing unit for train car - Google Patents

Rolling bearing unit for train car Download PDF

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JP2012172777A
JP2012172777A JP2011036133A JP2011036133A JP2012172777A JP 2012172777 A JP2012172777 A JP 2012172777A JP 2011036133 A JP2011036133 A JP 2011036133A JP 2011036133 A JP2011036133 A JP 2011036133A JP 2012172777 A JP2012172777 A JP 2012172777A
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Prior art keywords
contact
axle
rolling bearing
contact portion
inner ring
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JP2011036133A
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Japanese (ja)
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Hirotada Yanagimoto
広忠 柳本
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • F16C19/386—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings in O-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/10—Railway vehicles

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing unit for a train car capable of preventing fretting wear on a contact face between a rear cover and an inner ring.SOLUTION: The rolling bearing unit for the train car includes the rear cover 6 provided with two contact parts 6a and 6b coming in contact with an outer circumference of an axle 20 and provided on its inner circumference. A fitting margin of the second contact part 6b having higher radial rigidity with the axle 20 is larger than that of the first contact part 6a with lower radial rigidity with the axle 20.

Description

本発明は、本発明は、鉄道車両の車軸を回転自在に支持する鉄道車両用転がり軸受ユニットに関する。   The present invention relates to a rolling bearing unit for a railway vehicle that rotatably supports an axle of the railway vehicle.

鉄道車両の車軸の端部には鉄道車両用転がり軸受ユニットが取り付けられており、車軸を回転自在に支持するとともに車両の重量を支えている。図３は、従来の鉄道車両用転がり軸受ユニットを示す。   A rolling bearing unit for a railway vehicle is attached to an end portion of the axle of the railway vehicle, and rotatably supports the axle and supports the weight of the vehicle. FIG. 3 shows a conventional rolling bearing unit for railway vehicles.

この鉄道車両用転がり軸受ユニットは、鉄道車両に用いられる軸受の一例である複列円錐ころ軸受１０（以降、軸受１０と称す）を備えており、この軸受１０に鉄道車両の車軸２０が支持されている。軸受１０は、一体型の外輪１と各列に個別に分割された内輪２，２とを備え、内輪２と外輪１との間には、保持器４に保持された複数のころ（転動体）３が転動自在に配置されている。そして、軸受１０の軸方向両端側には、後蓋（又はバッキングリング）６及び前蓋７が内輪２，２の側面と当接するように配置されている。   The rolling bearing unit for a railway vehicle includes a double row tapered roller bearing 10 (hereinafter referred to as a bearing 10) that is an example of a bearing used in a railway vehicle, and the axle 20 of the railway vehicle is supported by the bearing 10. ing. The bearing 10 includes an integrated outer ring 1 and inner rings 2 and 2 that are individually divided into rows, and a plurality of rollers (rolling elements) held by a cage 4 are provided between the inner ring 2 and the outer ring 1. ) 3 is arranged to roll freely. A rear lid (or backing ring) 6 and a front lid 7 are disposed at both axial ends of the bearing 10 so as to contact the side surfaces of the inner rings 2 and 2.

後蓋６及び前蓋７の軸受寄りの外周側には、段付き円筒状のシールケース３１が外輪１に嵌合されて配置されている。シールケース３１の内周側には、環状のシール３２が取り付けられている。即ち、シール３２の外周側がシールケースの内周面に固着され、シールの内周側が後蓋６または前蓋７の外周面に摺接している。これにより、鉄道車両用転がり軸受ユニットが密封され、内部にごみ、水分、異物等が外部から侵入することを防ぐとともに、ユニット内のグリース等の潤滑剤が外部に漏出するのを防いでいる。   On the outer peripheral side of the rear lid 6 and the front lid 7 near the bearings, a stepped cylindrical seal case 31 is fitted to the outer ring 1 and disposed. An annular seal 32 is attached to the inner peripheral side of the seal case 31. That is, the outer peripheral side of the seal 32 is fixed to the inner peripheral surface of the seal case, and the inner peripheral side of the seal is in sliding contact with the outer peripheral surface of the rear lid 6 or the front lid 7. As a result, the rolling bearing unit for railway vehicles is sealed, and dust, moisture, foreign matter, etc. are prevented from entering from the outside, and lubricant such as grease in the unit is prevented from leaking to the outside.

ほとんどの鉄道車両用転がり軸受ユニットは、車輪の外側に配置されているアウトボードタイプであるので、荷重を受けた際には車軸２０がたわみ、車軸２０の端部ほどたわみ量が大きくなる。このような状態で車軸２０が回転すると、内輪２と後蓋６との接触面でフレッチング摩耗が起きており、損傷した後蓋６や内輪２を交換する問題や、摩耗粉が軸受内部へ侵入してグリースを劣化させる問題が発生している。   Most rolling bearing units for railway vehicles are of the outboard type arranged on the outside of the wheel. Therefore, the axle 20 bends when subjected to a load, and the amount of deflection increases toward the end of the axle 20. When the axle 20 rotates in such a state, fretting wear occurs on the contact surface between the inner ring 2 and the rear cover 6, and there is a problem of replacing the damaged rear cover 6 and the inner ring 2, and wear powder enters the inside of the bearing. As a result, there is a problem that the grease deteriorates.

特許文献１に記載の鉄道車両用軸受装置では、弾性シール部材のプレートを内輪と後蓋との間に挟みこむことで内輪と後蓋との摩耗を防ぎ、摩耗したプレートを適宜交換するようにしている。特許文献２に記載の鉄道車両用軸受装置では、後蓋の自由端側の端面にダイヤモンドライクカーボン膜を被覆して、フレッチング摩耗を防止している。特許文献３に記載の鉄道車両用軸受装置では、内輪と後蓋の端面同士を突き合わせた接触部の外周側に形成された凹溝に弾性密封部材を圧入し、摩耗粉を積極的に捕捉することで、摩耗粉が軸受内部に侵入し、拡散することを防止している。   In the railway vehicle bearing device described in Patent Document 1, wear of the inner ring and the rear cover is prevented by sandwiching the plate of the elastic seal member between the inner ring and the rear cover, and the worn plate is appropriately replaced. ing. In the railway vehicle bearing device described in Patent Document 2, the end surface on the free end side of the rear cover is covered with a diamond-like carbon film to prevent fretting wear. In the railway vehicle bearing device described in Patent Document 3, an elastic sealing member is press-fitted into a concave groove formed on the outer peripheral side of the contact portion where the end surfaces of the inner ring and the rear lid are brought into contact with each other, and the wear powder is actively captured. This prevents wear powder from entering and diffusing inside the bearing.

また、特許文献４に記載の鉄道車両用軸受装置では、内輪の軸方向内側の端面の内径側と後蓋の軸方向外側の端面の内径側とに当接が行われる当接部位を構成する一方、内輪の軸方向内側の端面の外径側と後蓋の軸方向外側の端面の外径側との間に隙間を介在して当接が行われない非当接部位を構成し、当接部位と非当接部位との間に環状の密封部位を設け、フレッチング摩耗による摩耗粉の軸受内部への侵入を防止している。さらに、特許文献５に記載の鉄道車両用軸受装置では、後蓋の小径端部の内周面が車軸と嵌合し、端面が内輪と接する一方、大径端部の端面が車軸の肩部と接しており、小径端部のはめあい面の外径側に凹部を設けて、車軸へのかじりを防止している。   Further, in the railway vehicle bearing device described in Patent Document 4, a contact portion is formed in which contact is made between the inner diameter side of the axially inner end surface of the inner ring and the inner diameter side of the rear cover axially outer end surface. On the other hand, a non-contact portion where no contact is made by interposing a gap between the outer diameter side of the inner end surface of the inner ring in the axial direction and the outer diameter side of the end surface of the rear cover in the axial direction is formed. An annular sealing part is provided between the contact part and the non-contact part to prevent wear powder from entering the bearing due to fretting wear. Furthermore, in the railway vehicle bearing device described in Patent Document 5, the inner peripheral surface of the small-diameter end portion of the rear cover is fitted to the axle and the end surface is in contact with the inner ring, while the end surface of the large-diameter end portion is the shoulder portion of the axle. A recess is provided on the outer diameter side of the fitting surface of the small diameter end portion to prevent galling on the axle.

特開２００４−３３２９０５号公報JP 2004-332905 A 特開２００３−２５４３４０号公報JP 2003-254340 A 特開２００１−３５４１３６号公報JP 2001-354136 A 特開２００５−３５１３７１号公報JP-A-2005-351371 特開２００８−８２３９２号公報JP 2008-82392 A

ところで、図３に示すように、後蓋と車軸とは、接触部Ａにて嵌合する場合が一般的であり、この接触部Ａの接触力によって後蓋は半径方向に押し広げられる。すると、接触面圧が偏り、後蓋外径部の角部において接触面圧が局所的に高くなり（以降、「角当り」と称す。）、フレッチング摩耗を生じる可能性があった。   Incidentally, as shown in FIG. 3, the rear lid and the axle are generally fitted at the contact portion A, and the rear lid is pushed and spread in the radial direction by the contact force of the contact portion A. Then, the contact surface pressure is biased, the contact surface pressure locally increases at the corner of the outer diameter portion of the rear lid (hereinafter referred to as “per corner”), and fretting wear may occur.

また、特許文献４に記載の鉄道車両用軸受装置では、後蓋が、車軸のジャーナル部の外周面と、このジャーナル部の外径より大径の外周面との２箇所で接触することが示されているが、各接触部でのはめあい代について開示されておらず、角当りを十分に抑制することができなかった。   Further, in the railway vehicle bearing device described in Patent Document 4, it is shown that the rear cover is contacted at two locations of the outer peripheral surface of the journal portion of the axle and the outer peripheral surface having a diameter larger than the outer diameter of the journal portion. However, the fitting allowance at each contact portion is not disclosed, and the corner contact cannot be sufficiently suppressed.

本発明は、上記事情に鑑みてなされたものであり、その目的は、後蓋と内輪との当接面におけるフレッチング摩耗を抑制することができる鉄道車両用転がり軸受ユニットを提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a rolling bearing unit for a railway vehicle that can suppress fretting wear on a contact surface between a rear lid and an inner ring.

本発明の上記目的は、下記の構成により達成される。
（１） 内輪、外輪、及び、前記内輪と前記外輪との間に転動自在に配置される複数の転動体を有し、鉄道車両の車軸を支持する転がり軸受と、
前記内輪の後端面側で前記車軸に外嵌される後蓋と、
を有する鉄道車両用転がり軸受ユニットにおいて、
前記後蓋の内周面には、前記車軸の外周面と接触する少なくとも２箇所の接触部が設けられており、
半径方向の剛性が高い前記接触部における前記車軸とのはめあい代は、半径方向の剛性が低い前記接触部における前記車軸とのはめあい代よりも大きいことを特徴とする鉄道車両用転がり軸受ユニット。
（２） 前記接触部には、クラウニングが施されていることを特徴とする（１）に記載の鉄道車両用転がり軸受ユニット。
（３） 前記車軸は、前記内輪が外嵌されるジャーナル部と、該ジャーナル部よりも車輪側で、前記ジャーナル部より大径の拡径部を有し、
前記後蓋の接触部は、前記拡径部の外周面と接触する第１の接触部と、軸方向において前記内輪と前記後蓋との当接面寄りで、前記ジャーナル部の外周面と接触する第２の接触部と、を備えることを特徴とする（１）または（２）に記載の鉄道車両用転がり軸受ユニット。 The above object of the present invention can be achieved by the following constitution.
(1) an inner ring, an outer ring, and a rolling bearing that has a plurality of rolling elements that are arranged to freely roll between the inner ring and the outer ring, and that supports an axle of a railway vehicle;
A rear lid that is externally fitted to the axle on the rear end face side of the inner ring;
In rolling bearing units for railway vehicles having
The inner peripheral surface of the rear lid is provided with at least two contact portions that come into contact with the outer peripheral surface of the axle,
A rolling bearing unit for a railway vehicle, wherein a fitting allowance with the axle in the contact portion having high radial rigidity is larger than a fitting allowance with the axle in the contact portion having low radial rigidity.
(2) The rolling bearing unit for a railway vehicle according to (1), wherein the contact portion is crowned.
(3) The axle has a journal part on which the inner ring is fitted, and an enlarged diameter part larger in diameter than the journal part on the wheel side of the journal part,
The contact portion of the rear lid is in contact with the outer peripheral surface of the journal portion near the contact surface between the inner ring and the rear lid in the axial direction, and the first contact portion that contacts the outer peripheral surface of the enlarged diameter portion. A rolling bearing unit for a railway vehicle according to (1) or (2), comprising: a second contact portion that performs the above operation.

本発明の鉄道車両用転がり軸受ユニットによれば、後蓋の内周面には、車軸の外周面と接触する少なくとも２箇所の接触部が設けられており、半径方向の剛性が高い接触部における車軸とのはめあい代は、半径方向の剛性が低い接触部における車軸とのはめあい代よりも大きい。これにより、車軸とのはめあい後の後蓋が半径方向に均等に広がるように変形でき、角当りを抑制することができ、後蓋と内輪との当接面におけるフレッチング摩耗を抑制することができる。   According to the rolling bearing unit for a railway vehicle of the present invention, the inner peripheral surface of the rear cover is provided with at least two contact portions that come into contact with the outer peripheral surface of the axle, and in the contact portion having high radial rigidity. The fitting allowance with the axle is larger than the fitting allowance with the axle at the contact portion having low rigidity in the radial direction. Accordingly, the rear lid after fitting with the axle can be deformed so as to spread evenly in the radial direction, corner contact can be suppressed, and fretting wear at the contact surface between the rear lid and the inner ring can be suppressed. .

本発明の鉄道車両用転がり軸受ユニットを示す要部拡大断面図である。It is a principal part expanded sectional view which shows the rolling bearing unit for rail vehicles of this invention. 本発明の鉄道車両用転がり軸受ユニットの変形例を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the modification of the rolling bearing unit for rail vehicles of this invention. 従来の鉄道車両用転がり軸受ユニットの断面図である。It is sectional drawing of the conventional rolling bearing unit for rail vehicles.

以下、本発明に係る鉄道車両用転がり軸受ユニットの一実施形態について図面に基づいて詳細に説明する。なお、上記図３に記載の鉄道車両用軸受ユニットと同一又は同等部分については、図面に同一符号を付してその説明を省略或いは簡略化する。   Hereinafter, an embodiment of a rolling bearing unit for a railway vehicle according to the present invention will be described in detail with reference to the drawings. In addition, about the same or equivalent part as the railway vehicle bearing unit described in FIG. 3, the same reference numerals are attached to the drawings, and description thereof is omitted or simplified.

本実施形態の鉄道車両用転がり軸受ユニットでは、図１に示すように、車軸２０は、内輪２が外嵌されるジャーナル部２０ａと、ジャーナル部２０ａよりも車輪側で、ジャーナル部２０ａより大径の拡径部２０ｂを有する。   In the rolling bearing unit for railway vehicles according to the present embodiment, as shown in FIG. 1, the axle 20 has a journal part 20a on which the inner ring 2 is fitted and a diameter larger than that of the journal part 20a on the wheel side of the journal part 20a. Having an enlarged diameter portion 20b.

内輪２の後端面側で車軸２０に外嵌される後蓋６の内周面には、拡径部２０ｂの外周面と嵌合して接触する第１の接触部６ａと、軸方向において内輪２と後蓋６との当接面寄りで、ジャーナル部２０ａの外周面と嵌合して接触する第２の接触部６ｂと、を備える。第２の接触部６ｂには、クラウニング加工が施されている。また、後蓋６の外周面には、内輪２との当接面６ｃ寄りの部分に環状の切欠き６ｄが形成されている。   A first contact portion 6a that fits and contacts the outer peripheral surface of the enlarged-diameter portion 20b is formed on the inner peripheral surface of the rear lid 6 that is externally fitted to the axle 20 on the rear end surface side of the inner ring 2, and the inner ring in the axial direction. 2 and a second contact portion 6b that fits and contacts the outer peripheral surface of the journal portion 20a near the contact surface between the rear lid 6 and the rear cover 6. The second contact portion 6b is subjected to crowning. Further, an annular notch 6 d is formed on the outer peripheral surface of the rear lid 6 at a portion near the contact surface 6 c with the inner ring 2.

ここで、本実施形態では、半径方向の剛性が高い第２の接触部６ｂにおける車軸２０とのはめあい代は、半径方向の剛性が低い第１の接触部６ａにおける車軸２０とのはめあい代よりも大きくなるように設定されている。第１及び第２の接触部６ａ，６ｂにおける各はめあい代は、３０〜１２０μｍ、好ましくは、４０〜８０μｍの範囲で、上記要件を満たすように適切に設定されている。   Here, in this embodiment, the fitting allowance with the axle 20 in the second contact portion 6b having high radial rigidity is more than the fitting allowance with the axle 20 in the first contact portion 6a having low radial rigidity. It is set to be large. The fitting allowances in the first and second contact portions 6a and 6b are appropriately set to satisfy the above requirements in the range of 30 to 120 μm, preferably 40 to 80 μm.

このように構成された鉄道車両用転がり軸受ユニットによれば、後蓋６の内周面に、車軸２０の外周面と接触する第１及び第２の接触部６ａ，６ｂを設け、後蓋６と車軸２０とを２箇所で接触させるので、内輪２と後蓋６との当接面での角当りを低減し、該当接面におけるフレッチング摩耗を抑制することができる。また、半径方向の剛性が高い第２の接触部６ｂにおける車軸２０とのはめあい代は、半径方向の剛性が低い第１の接触部６ａにおける車軸２０とのはめあい代よりも大きく設定し、車軸２０とのはめあい後における後蓋６の半径方向の変形量を同一にして、角当りを抑制することができる。従って、後蓋６と内輪２とのフレッチング摩耗を抑制することができる。   According to the rolling bearing unit for a railway vehicle configured as described above, the first and second contact portions 6 a and 6 b that contact the outer peripheral surface of the axle 20 are provided on the inner peripheral surface of the rear cover 6. And the axle 20 are brought into contact with each other at two locations, the corner contact at the contact surface between the inner ring 2 and the rear lid 6 can be reduced, and fretting wear at the contact surface can be suppressed. Further, the fitting allowance with the axle 20 in the second contact portion 6b having high radial rigidity is set to be larger than the fitting allowance with the axle 20 in the first contact portion 6a having low radial rigidity. The amount of deformation in the radial direction of the rear lid 6 after the fitting can be made the same to suppress corner contact. Therefore, fretting wear between the rear lid 6 and the inner ring 2 can be suppressed.

また、第２の接触部６ｂには、クラウニングが施されているので、第２の接触部６ｂにおけるフレッチング摩耗をさらに抑制することができる。   Further, since the second contact portion 6b is crowned, fretting wear at the second contact portion 6b can be further suppressed.

図２は、本発明に係る鉄道車両用転がり軸受ユニットの変形例を示す。図２では、後蓋６の内周面に、車軸２０の外周面と接触する３箇所の接触部、即ち、第１〜第３の接触部６ａ，６ｂ´，６ｅ´が設けられている。この場合、第２及び第３の接触部６ｂ´，６ｅ´は、軸方向において内輪２と後蓋６との当接面寄りの位置に設けられており、それぞれ同一の曲率でクラウニングが施されている。また、半径方向の剛性が高い第２及び第３の接触部６ｂ´，６ｅ´は、第１の接触部６ａに比べてはめあい代が大きく設定されている。   FIG. 2 shows a modification of the rolling bearing unit for railway vehicles according to the present invention. In FIG. 2, three contact portions that are in contact with the outer peripheral surface of the axle 20, that is, first to third contact portions 6 a, 6 b ′, and 6 e ′ are provided on the inner peripheral surface of the rear lid 6. In this case, the second and third contact portions 6b 'and 6e' are provided at positions close to the contact surface between the inner ring 2 and the rear lid 6 in the axial direction, and are crowned with the same curvature. ing. Further, the second and third contact portions 6b 'and 6e' having high radial rigidity have a larger fitting margin than the first contact portion 6a.

従って、該変形例においても、後蓋６の内周面に、車軸２０の外周面と接触する第１〜第３の接触部６ａ，６ｂ´，６ｅ´を設け、後蓋６と車軸２０とを３箇所で接触させるので、内輪２と後蓋６との当接面での角当りを低減し、該当接面におけるフレッチング摩耗を抑制することができる。また、半径方向の剛性が高い第２及び第３の接触部６ｂ´，６ｅ´における車軸２０とのはめあい代は、半径方向の剛性が低い第１の接触部６ａにおける車軸２０とのはめあい代よりも大きく設定しているので、車軸２０とのはめあい後における後蓋６の半径方向の変形量を同一にして、角当りを抑制することができる。   Therefore, also in this modification, the 1st-3rd contact part 6a, 6b ', 6e' which contacts the outer peripheral surface of the axle 20 is provided in the inner peripheral surface of the rear cover 6, and the rear cover 6 and the axle 20 are provided. Can be brought into contact with each other at three locations, the corner contact at the contact surface between the inner ring 2 and the rear lid 6 can be reduced, and fretting wear at the contact surface can be suppressed. Further, the fitting allowance with the axle 20 in the second and third contact portions 6b ′, 6e ′ having high radial rigidity is more than the fitting allowance with the axle 20 in the first contact portion 6a having low radial rigidity. Since the amount of deformation in the radial direction of the rear cover 6 after fitting with the axle 20 is the same, corner hitting can be suppressed.

また、第２及び第３の接触部６ｂ´，６ｅ´は、クラウニングを同一の曲率としているので、各接触部６ｂ´，６ｅ´での接触面圧を低減することができ、内輪２と後蓋６との当接面でのフレッチング摩耗を抑制することができる。   Further, since the second and third contact portions 6b 'and 6e' have the same curvature as the crowning, the contact surface pressure at each contact portion 6b 'and 6e' can be reduced, and the inner ring 2 and the rear contact can be reduced. Fretting wear at the contact surface with the lid 6 can be suppressed.

なお、本発明は、前述した各実施形態に限定されるものでなく、適宜、変形、改良等が可能である。   In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

本発明の車軸２０の外周面と接触する後蓋６の接触部は、少なくとも２箇所設けられればよく、接触部の数は任意である。   The contact part of the back cover 6 which contacts the outer peripheral surface of the axle 20 of this invention should just be provided at least two places, and the number of contact parts is arbitrary.

また、本実施形態では、第２や第３の接触部６ｂ，６ｂ´，６ｅ´にクラウニング加工が施されているが、各接触部におけるクラウニング加工は任意であり、いずれかの接触部にクラウニング加工が施されてもよく、全ての接触部にクラウニング加工が施されてもよい。   In the present embodiment, the second and third contact portions 6b, 6b ′, and 6e ′ are crowned, but the crowning process at each contact portion is arbitrary, and any of the contact portions is crowned. A process may be given and a crowning process may be given to all the contact parts.

なお、本実施形態では、第２の接触部６ｂにおけるはめあい代を第１の接触部６ａにおけるはめあい代よりも大きくしているが、半径方向の剛性が高い接触部のはめあい代を半径方向の剛性が低い接触部のはめあい代より大きく設定すればよい。例えば、剛性の度合いに応じて、第１の接触部のはめあい代が第２の接触部のはめあい代よりも大きく設定されてもよい。   In this embodiment, the fitting allowance in the second contact portion 6b is larger than the fitting allowance in the first contact portion 6a, but the fitting allowance of the contact portion having high radial rigidity is set to the radial rigidity. May be set larger than the fitting allowance of the contact portion having a low value. For example, the fitting allowance of the first contact portion may be set larger than the fitting allowance of the second contact portion according to the degree of rigidity.

１ 外輪
２ 内輪
３ ころ（転動体）
６ 後蓋
６ａ 第１の接触部
６ｂ 第２の接触部
１０ 複列円錐ころ軸受（転がり軸受）
２０ 車軸 1 Outer ring 2 Inner ring 3 Roller (rolling element)
6 Rear cover 6a First contact portion 6b Second contact portion 10 Double row tapered roller bearing (rolling bearing)
20 axles

Claims (3)

内輪、外輪、及び、前記内輪と前記外輪との間に転動自在に配置される複数の転動体を有し、鉄道車両の車軸を支持する転がり軸受と、
前記内輪の後端面側で前記車軸に外嵌される後蓋と、
を有する鉄道車両用転がり軸受ユニットにおいて、
前記後蓋の内周面には、前記車軸の外周面と接触する少なくとも２箇所の接触部が設けられており、
半径方向の剛性が高い前記接触部における前記車軸とのはめあい代は、半径方向の剛性が低い前記接触部における前記車軸とのはめあい代よりも大きいことを特徴とする鉄道車両用転がり軸受ユニット。 An inner ring, an outer ring, and a rolling bearing that has a plurality of rolling elements that are freely rollable between the inner ring and the outer ring, and that supports an axle of a railway vehicle;
A rear lid that is externally fitted to the axle on the rear end face side of the inner ring;
In rolling bearing units for railway vehicles having
The inner peripheral surface of the rear lid is provided with at least two contact portions that come into contact with the outer peripheral surface of the axle,
A rolling bearing unit for a railway vehicle, wherein a fitting allowance with the axle in the contact portion having high radial rigidity is larger than a fitting allowance with the axle in the contact portion having low radial rigidity. 前記接触部には、クラウニングが施されていることを特徴とする請求項１に記載の鉄道車両用転がり軸受ユニット。   The rolling bearing unit for a railway vehicle according to claim 1, wherein the contact portion is crowned. 前記車軸は、前記内輪が外嵌されるジャーナル部と、該ジャーナル部よりも車輪側で、前記ジャーナル部より大径の拡径部を有し、
前記後蓋の接触部は、前記拡径部の外周面と接触する第１の接触部と、軸方向において前記内輪と前記後蓋との当接面寄りで、前記ジャーナル部の外周面と接触する第２の接触部と、を備えることを特徴とする請求項１または２に記載の鉄道車両用転がり軸受ユニット。

The axle has a journal part on which the inner ring is fitted, and a wheel diameter side of the journal part, and an enlarged diameter part having a larger diameter than the journal part,
The contact portion of the rear lid is in contact with the outer peripheral surface of the journal portion near the contact surface between the inner ring and the rear lid in the axial direction, and the first contact portion that contacts the outer peripheral surface of the enlarged diameter portion. The rolling bearing unit for a railway vehicle according to claim 1, further comprising: a second contact portion that performs the above operation.

JP2011036133A 2011-02-22 2011-02-22 Rolling bearing unit for train car Withdrawn JP2012172777A (en)

Priority Applications (1)

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Publications (1)

Publication Number Publication Date
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