JP2016205443A - Bearing for railway vehicle axle - Google Patents

Bearing for railway vehicle axle Download PDF

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JP2016205443A
JP2016205443A JP2015084334A JP2015084334A JP2016205443A JP 2016205443 A JP2016205443 A JP 2016205443A JP 2015084334 A JP2015084334 A JP 2015084334A JP 2015084334 A JP2015084334 A JP 2015084334A JP 2016205443 A JP2016205443 A JP 2016205443A
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axle
peripheral surface
bearing
railway vehicle
inner peripheral
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城田　伸一
Shinichi Shirota
伸一 城田
健人 竹内
Kento Takeuchi
健人 竹内
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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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a bearing for railway vehicle axle capable of holding lubrication performance on a fitting surface of an axle and the inner peripheral surface of an inner ring, and capable of press-fitting the inner ring into the axle with proper press-in force without damaging the axle.SOLUTION: A bearing 20 for railway vehicle axle has an outer ring 21, an inner ring 22 and a plurality of rolling bodies 23, and rotatably supports an axle 50 to the end part of which the wheel of a railway vehicle is attached. Between an inner peripheral surface 22a and an end surface 22b of the inner rings 22, 22, formed is a tapered chamfer part 22c of which the diameter becomes larger toward its end surface at an angle α of 10-12° to the inner peripheral surface 22a.SELECTED DRAWING: Figure 3

Description

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車軸用軸受に関する。   The present invention relates to a railway vehicle axle bearing that rotatably supports an axle of a railway vehicle.

鉄道車両の車軸の端部には鉄道車両用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共に車両の重量を支えている。   A railcar bearing unit 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.

この種の鉄道車両用軸受ユニットは、一般的に、鉄道車両車軸用軸受の一例である複列円錐ころ軸受（以下、単に「軸受」ともいう）を備えており、この軸受に鉄道車両の車軸が支持される。そして、この軸受は、単一の外輪と各列に個別に分割された２つの内輪とを備え、外輪と内輪の２列の軌道面間には、保持器に保持された複数の円錐ころが転動自在に配置される。この軸受の軸方向両端側には、前蓋及び後蓋（「バッキングリング」とも呼ばれる）が内輪の軸方向端面と当接するように配置されている。   This type of railway vehicle bearing unit generally includes a double-row tapered roller bearing (hereinafter also simply referred to as a “bearing”), which is an example of a railway vehicle axle bearing. Is supported. The bearing includes a single outer ring and two inner rings that are individually divided into rows, and a plurality of tapered rollers held by a cage are provided between the two raceways of the outer ring and the inner ring. It is arranged to roll freely. A front lid and a rear lid (also referred to as “backing ring”) are disposed on both axial ends of the bearing so as to contact the axial end surface of the inner ring.

また、軸受は、十分な締め代を持って車軸に装着されており、該軸受を車軸に装着する際には、専用の圧入装置を用いて圧入が行われる。また、その際、車軸の軸受圧入部の入り口近傍には、嵌め合い面を潤滑するための潤滑剤（二硫化モリブデン：Ｍｏｓ２）が塗布されている。   Further, the bearing is mounted on the axle with a sufficient tightening margin, and when the bearing is mounted on the axle, press-fitting is performed using a dedicated press-fitting device. At that time, a lubricant (molybdenum disulfide: Mos2) for lubricating the fitting surface is applied in the vicinity of the entrance of the bearing press-fitting portion of the axle.

さらに、従来の軸受では、図５に示すように、圧入される内輪１００の内周面１００ａと端面１００ｂとの間に、曲面の面取り部１００ｃが施されており、また、内輪１００の内周面１００ａと面取り部１００ｃとの間には、割線Ｌが形成されている。   Furthermore, in the conventional bearing, as shown in FIG. 5, a curved chamfered portion 100 c is provided between the inner peripheral surface 100 a and the end surface 100 b of the inner ring 100 to be press-fitted. A dividing line L is formed between the surface 100a and the chamfered portion 100c.

また、鉄道車両車軸用軸受において、内輪の内周面と端面との間に面取りが施されたものが種々開示されている（例えば、特許文献１〜３参照。）。例えば、特許文献１に記載の鉄道車両車軸用軸受では、内輪の端面に連なる内周面端縁に、端面に向かって徐々に拡径する挿入案内面を形成し、ストレート部と挿入案内面との稜線部を含む内輪の帯状領域の表面硬さを車軸の表面硬さよりも低くして、車軸の外周面に生じる傷を防止することが記載されている。   Further, various types of bearings for railway vehicle axles in which chamfering is performed between the inner peripheral surface and the end surface of the inner ring are disclosed (for example, see Patent Documents 1 to 3). For example, in the railway vehicle axle bearing described in Patent Document 1, an insertion guide surface that gradually increases in diameter toward the end surface is formed on the inner peripheral surface edge continuous to the end surface of the inner ring, and the straight portion and the insertion guide surface It is described that the surface hardness of the belt-like region of the inner ring including the ridge line portion is made lower than the surface hardness of the axle to prevent scratches on the outer peripheral surface of the axle.

特開２００３−３１４５６６号公報JP 2003-314666 A 特開平０９−６８２３２号公報JP 09-68232 A 特開平０９−７２３４４号公報JP 09-72344 A

ところで、従来の鉄道車両車軸用軸受において、図５に示すような内輪の面取り形状では、軸受を圧入する際、車軸の軸受圧入部の入り口近傍の嵌め合い面に塗布された該潤滑剤（Ｍｏｓ２）を掻き取ってしまう虞がある。このため、潤滑剤の効果がなくなり、圧入時の振動大による車軸への傷の付与、または、圧入荷重過大によって、軸受が車軸の所定の位置まで圧入できないという課題があった。   Incidentally, in the conventional railway vehicle axle bearing, in the chamfered shape of the inner ring as shown in FIG. 5, when the bearing is press-fitted, the lubricant (Mos2) applied to the fitting surface near the entrance of the bearing press-fit portion of the axle. ) May be scraped off. For this reason, the effect of the lubricant is lost, and there is a problem that the bearing cannot be press-fitted to a predetermined position of the axle due to scratches on the axle due to large vibration during press-fitting or excessive press-fitting load.

また、特許文献１〜３においても、車軸と内輪の内周面との嵌め合い面における潤滑剤（Ｍｏｓ２）の掻き取りについては考慮されておらず、改善の余地があった。   In Patent Documents 1 to 3, the scraping of the lubricant (Mos2) on the fitting surface between the axle and the inner peripheral surface of the inner ring is not considered, and there is room for improvement.

本発明は、前述の事情に鑑みてなされたものであり、その目的は、車軸と内輪の内周面との嵌め合い面での潤滑性能を保持することができ、車軸を損傷することなく、内輪を車軸に適正な圧入力で圧入することができる鉄道車両車軸用軸受を提供することにある。   The present invention has been made in view of the above-described circumstances, and its purpose is to maintain the lubrication performance of the fitting surface between the axle and the inner peripheral surface of the inner ring without damaging the axle. An object of the present invention is to provide a railcar axle bearing capable of press-fitting an inner ring into an axle with an appropriate pressure input.

本発明の上記目的は、下記の構成により達成される。
（１） 外輪と、内輪と、外輪と内輪との間に転動自在に配置される複数の転動体と、を有し、鉄道車両の車輪が端部に取り付けられる車軸を回転自在に支持する鉄道車両車軸用軸受において、
前記内輪の内周面と端面との間には、該内周面に対して１０〜１２°の角度で端面側に拡径するテーパ形状の面取り部が施されることを特徴とする鉄道車両車軸用軸受。
（２） 前記面取り部は、前記内輪の内周面と前記面取り部との交点が、前記内輪の端面から５ｍｍ以内の範囲にあるように形成されることを特徴とする（１）に記載の鉄道車両車軸用軸受。
（３） 前記内輪の内周面と前記面取り部とは、前記内周面及び前記面取り部を接線とする所定の曲率半径を持った円弧面で繋がれていることを特徴とする（１）または（２）に記載の鉄道車両車軸用軸受。
（４） 前記車軸と前記内輪の内周面との嵌め合い面には、前記内輪を前記車軸に圧入する際に前記車軸の外周面に塗布された潤滑剤が保持されていることを特徴とする（１）〜（３）のいずれかに記載の鉄道車両車軸用軸受。 The above object of the present invention can be achieved by the following constitution.
(1) It has an outer ring, an inner ring, and a plurality of rolling elements that are rotatably arranged between the outer ring and the inner ring, and rotatably supports an axle on which a wheel of a railway vehicle is attached to an end. In railway vehicle axle bearings,
A railway vehicle characterized in that a tapered chamfered portion is provided between the inner peripheral surface and the end surface of the inner ring so as to expand toward the end surface at an angle of 10 to 12 ° with respect to the inner peripheral surface. Axle bearing.
(2) The chamfered portion is formed so that an intersection of an inner peripheral surface of the inner ring and the chamfered portion is within a range of 5 mm from an end surface of the inner ring. Bearings for railway vehicle axles.
(3) The inner peripheral surface of the inner ring and the chamfered portion are connected by an arc surface having a predetermined radius of curvature with the inner peripheral surface and the chamfered portion as a tangent line (1). Or the railcar axle bearing as described in (2).
(4) The fitting surface between the axle and the inner peripheral surface of the inner ring holds a lubricant applied to the outer peripheral surface of the axle when the inner ring is press-fitted into the axle. The railway vehicle axle bearing according to any one of (1) to (3).

本発明の鉄道車両車軸用軸受によれば、内輪の内周面と端面との間には、該内周面に対して１０〜１２°の角度で端面側に拡径するテーパ形状の面取り部が施されるので、車軸と内輪の内周面との嵌め合い面での潤滑性能を保持することができ、車軸を損傷することなく、内輪を車軸に適正な圧入力で圧入することができる。   According to the railcar axle bearing of the present invention, a taper-shaped chamfer between the inner peripheral surface and the end surface of the inner ring that expands toward the end surface at an angle of 10 to 12 ° with respect to the inner peripheral surface. Therefore, the lubrication performance of the fitting surface between the axle and the inner peripheral surface of the inner ring can be maintained, and the inner ring can be pressed into the axle with an appropriate pressure input without damaging the axle. .

本発明に係る鉄道車両用軸受ユニットの一実施形態を説明する断面図である。It is sectional drawing explaining one Embodiment of the bearing unit for rail vehicles which concerns on this invention. 図１の鉄道車両用軸受ユニットが車軸に圧入される過程を説明するための断面図である。FIG. 2 is a cross-sectional view for explaining a process in which the railway vehicle bearing unit of FIG. 1 is press-fitted into an axle. （ａ）は、内輪の面取り部を説明するための部分拡大図であり、（ｂ）は、（ａ）のＩＩＩ部拡大図である。(A) is the elements on larger scale for demonstrating the chamfer part of an inner ring | wheel, (b) is the III section enlarged view of (a). （ａ）は、変形例の内輪の面取り部を説明するための部分拡大図であり、（ｂ）は、（ａ）のＩＶ部拡大図である。(A) is the elements on larger scale for demonstrating the chamfering part of the inner ring | wheel of a modification, (b) is the IV section enlarged view of (a). 従来の内輪の面取り部を説明するための部分拡大図である。It is the elements on larger scale for demonstrating the chamfering part of the conventional inner ring | wheel.

以下、本発明に係る鉄道車両用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。   Hereinafter, an embodiment of a railway vehicle bearing unit according to the present invention will be described in detail with reference to the drawings.

本実施形態の鉄道車両用軸受ユニット１０は、図１に示すように、鉄道車両車軸用軸受として複列円錐ころ軸受２０を備え、この軸受２０により鉄道車両の車軸５０が回転自在に支持されている。また、車軸５０の外端部（図１の右端部）には、鉄道車両の不図示の車輪が取り付けられている。そして、複列円錐ころ軸受２０は、単一の外輪２１と、各列に個別に分割された２つの内輪２２，２２と、外輪２１と内輪２２，２２との２列の軌道面間に転動自在に配置される複数の円錐ころ（転動体）２３と、複数の円錐ころ２３を保持する保持器２４と、を備える。外輪２１の軸方向中央部の適所には、軸受空間内にグリースを封入するためのグリース供給口２１ａが形成されている。   As shown in FIG. 1, the railway vehicle bearing unit 10 of the present embodiment includes a double-row tapered roller bearing 20 as a railway vehicle axle bearing, and the axle 50 of the railway vehicle is rotatably supported by the bearing 20. Yes. A wheel (not shown) of the railway vehicle is attached to the outer end portion (the right end portion in FIG. 1) of the axle 50. The double-row tapered roller bearing 20 rolls between two rows of raceway surfaces, that is, a single outer ring 21, two inner rings 22, 22 individually divided into each row, and the outer ring 21 and the inner rings 22, 22. A plurality of tapered rollers (rolling elements) 23 that are movably disposed, and a cage 24 that holds the plurality of tapered rollers 23 are provided. A grease supply port 21a for enclosing grease in the bearing space is formed at an appropriate position in the axially central portion of the outer ring 21.

内輪２２，２２の軸方向両端側には、前蓋３０及び後蓋３１が、内輪２２の軸方向端面とそれぞれ当接するようにして、車軸５０の回りに配置されている。そして、内輪２２，２２、前蓋３０及び後蓋３１は、車軸５０の外周面段差部５１とナット１１との間で挟みつけられ、車軸５０の軸端５２側から回り止めリング１２を介してボルト１３で固定されている。また、外輪２１は、図示しないハウジングに固定されることにより、軸方向に位置決めされている。   A front lid 30 and a rear lid 31 are disposed around the axle 50 so as to abut on the axial end surfaces of the inner ring 22 at both axial ends of the inner rings 22, 22. The inner rings 22, 22, the front lid 30, and the rear lid 31 are sandwiched between the outer peripheral surface stepped portion 51 of the axle 50 and the nut 11, and from the shaft end 52 side of the axle 50 through the detent ring 12. It is fixed with bolts 13. Further, the outer ring 21 is positioned in the axial direction by being fixed to a housing (not shown).

複列円錐ころ軸受２０の両側には、接触型の密封装置３２，３２が装着されており、この密封装置３２，３２によって、複列円錐ころ軸受２０内への異物の侵入や、軸受内部からの潤滑剤（グリース）の漏出が防止されている。   Contact-type sealing devices 32 and 32 are mounted on both sides of the double row tapered roller bearing 20. By these sealing devices 32 and 32, foreign matter enters the double row tapered roller bearing 20 and from inside the bearing. Leakage of lubricant (grease) is prevented.

また、このように構成される本実施形態の鉄道車両用軸受ユニット１０では、図２に示すように、複列円錐ころ軸受２０、前蓋３０、後蓋３１、及び密封装置３２，３２がユニット化されて、車軸５０の軸端５２側から挿入され、車軸５０の外周面に圧入される。また、車軸５０の軸受圧入部の入り口近傍には、潤滑剤（Ｍｏｓ２）が塗布されており、複列円錐ころ軸受２０を車軸５０に圧入する際に、車軸５０と内輪２２，２２の内周面との間の嵌め合い面を潤滑する。   Further, in the railway vehicle bearing unit 10 of this embodiment configured as described above, as shown in FIG. 2, the double row tapered roller bearing 20, the front lid 30, the rear lid 31, and the sealing devices 32 and 32 are units. Is inserted from the shaft end 52 side of the axle 50 and is press-fitted into the outer peripheral surface of the axle 50. Further, a lubricant (Mos2) is applied in the vicinity of the entrance of the bearing press-fitting portion of the axle 50, and when the double-row tapered roller bearing 20 is press-fitted into the axle 50, the inner periphery of the axle 50 and the inner rings 22, 22 is applied. Lubricate the mating surface between the surfaces.

ここで、本実施形態では、図３に示すように、内輪２２，２２の内周面２２ａと軸方向両端面２２ｂとの間に、該内周面に対して１０〜１２°の角度αで端面側に拡径するテーパ形状の面取り部２２ｃがそれぞれ施されている。また、面取り部２２ｃは、内輪２２，２２の内周面２２ａと面取り部２２ｃとの交点Ｐが、内輪２２，２２の端面２２ｂから５ｍｍ以内の範囲となるように形成されている。   Here, in this embodiment, as shown in FIG. 3, between the inner peripheral surface 22a of the inner rings 22 and 22 and both axial end surfaces 22b, the angle α is 10 to 12 ° with respect to the inner peripheral surface. Taper-shaped chamfered portions 22c that expand in diameter are provided on the end surface side. Further, the chamfered portion 22c is formed such that the intersection point P between the inner peripheral surface 22a of the inner rings 22 and 22 and the chamfered portion 22c is within a range of 5 mm from the end surface 22b of the inner rings 22 and 22.

このため、上記面取り部２２ｃを備えた内輪２２，２２を車軸５０に圧入することで、車軸５０の軸受圧入部の入り口近傍に塗布された潤滑剤（Ｍｏｓ２）が掻き取られるのを抑制すると共に、車軸５０と内輪２２，２２の内周面２２ａとの嵌め合い面への潤滑剤の導入を促進し、該嵌め合い面への潤滑性能を保持することができる。   Therefore, by pressing the inner rings 22 and 22 having the chamfered portion 22c into the axle 50, it is possible to prevent the lubricant (Mos2) applied near the entrance of the bearing press-fit portion of the axle 50 from being scraped off. The introduction of the lubricant into the fitting surface between the axle 50 and the inner peripheral surface 22a of the inner ring 22, 22 can be promoted, and the lubricating performance on the fitting surface can be maintained.

なお、面取り部２２ｃの角度αは、１２°より大きくなると、内輪２２，２２の内周面２２ａと面取り部２２ｃとの交点Ｐで、エッジが立ち（角部が形成され）、当該潤滑剤（Ｍｏｓ２）が掻き取られてしまう可能性がある。一方、面取り部２２ｃの角度αが、１０°より小さくなると、車軸５０と内輪２２，２２の内周面２２ａとの嵌め合い面への潤滑剤の導入効果が小さくなる。   When the angle α of the chamfered portion 22c is greater than 12 °, an edge stands (forms a corner) at the intersection P between the inner peripheral surface 22a of the inner rings 22 and 22 and the chamfered portion 22c, and the lubricant ( Mos2) may be scraped off. On the other hand, when the angle α of the chamfered portion 22c is smaller than 10 °, the effect of introducing the lubricant into the fitting surface between the axle 50 and the inner peripheral surface 22a of the inner ring 22, 22 is reduced.

また、上記面取り部２２ｃの角度αの範囲は、軸受２０を車軸５０に組み込む再現実験時に圧入力を測定することで得られたものであり、面取り部２２ｃの角度αを上記範囲内とすることで、潤滑剤の掻き取りが抑制され、且つ、挿入時に引っかかりがなく、滑らかな圧入力の曲線が得られた。   The range of the angle α of the chamfered portion 22c is obtained by measuring the pressure input during a reproduction experiment in which the bearing 20 is incorporated in the axle 50, and the angle α of the chamfered portion 22c is within the above range. Thus, scraping of the lubricant was suppressed, and there was no catching at the time of insertion, and a smooth pressure input curve was obtained.

このように構成された、本実施形態の鉄道車両用軸受ユニット１０によれば、内輪２２，２２の内周面２２ａと軸方向端面２２ｂとの間に、該内周面に対して１０〜１２°の角度αで端面側に拡径するテーパ形状の面取り部２２ｃが施されているので、車軸５０の軸受圧入部の入り口近傍に嵌め合い面の潤滑のための潤滑剤（Ｍｏｓ２）の掻き取りを抑制し、さらに、車軸５０と内輪２２，２２の内周面２２ａとの嵌め合い面への潤滑剤の導入を促進して、該嵌め合い面への潤滑性能を保持することができる。その結果、適正な圧入力、及び低振動で内輪２２，２２を圧入することができ、車軸５０の保護、及び圧入不良を抑制することができる。   According to the railway vehicle bearing unit 10 of the present embodiment configured as described above, between the inner peripheral surface 22a of the inner rings 22 and 22 and the axial end surface 22b, 10 to 12 with respect to the inner peripheral surface. Since the taper-shaped chamfered portion 22c that expands toward the end surface at an angle α of ° is provided, the lubricant (Mos2) for lubricating the mating surface is scraped off in the vicinity of the entrance of the bearing press-fit portion of the axle 50. Further, the introduction of the lubricant into the fitting surface between the axle 50 and the inner peripheral surface 22a of the inner ring 22, 22 can be promoted, and the lubricating performance on the fitting surface can be maintained. As a result, the inner rings 22 and 22 can be press-fitted with appropriate pressure input and low vibration, and the axle 50 can be protected and press-fitting failure can be suppressed.

また、本実施形態の鉄道車両用軸受ユニット１０によれば、面取り部２２ｃは、内輪２２，２２の内周面２２ａと面取り部２２ｃとの交点Ｐが、内輪２２，２２の端面２２ｂから５ｍｍ以内の範囲にあるように形成されるので、上記効果を奏すると共に、現状の軸受の内輪内径の軸方向長さに対して、車軸５０と内輪２２，２２の内周面２２ａとの圧入長さを十分に確保することができ、通常の締め代で車軸５０に対する内輪２２，２２の必要把握力が確保できる。   Further, according to the railway vehicle bearing unit 10 of the present embodiment, the chamfered portion 22c has an intersection P between the inner peripheral surface 22a of the inner rings 22 and 22 and the chamfered portion 22c within 5 mm from the end surface 22b of the inner rings 22 and 22. Therefore, the press-fit length of the axle 50 and the inner peripheral surface 22a of the inner ring 22, 22 can be increased with respect to the axial length of the inner diameter of the inner ring of the current bearing. It is possible to sufficiently secure the necessary grasping force of the inner rings 22 and 22 with respect to the axle 50 with a normal tightening allowance.

なお、本発明は上記実施形態に例示したものに限定されるものではなく、本発明の要旨を逸脱しない範囲において適宜変更可能である。   In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

例えば、本実施形態の変形例として、図４に示すように、内輪２２，２２の内周面２２ａと面取り部２２ｃとは、内周面２２ａ及び面取り部２２ｃを接線とする所定の曲率半径を持った円弧面２２ｄで繋がれるようにしてもよい。これにより、潤滑剤の掻き取りをさらに抑制することができる。   For example, as a modification of the present embodiment, as shown in FIG. 4, the inner peripheral surface 22 a and the chamfered portion 22 c of the inner rings 22, 22 have a predetermined radius of curvature with the inner peripheral surface 22 a and the chamfered portion 22 c as tangents. You may make it connect with the circular arc surface 22d with which it had. Thereby, scraping off of the lubricant can be further suppressed.

また、本実施形態では、鉄道車両車軸用軸受として、複列円錐ころ軸受が適用されているが、これに限定されず、他の形式の転がり軸受が適用されてもよい。   In this embodiment, a double-row tapered roller bearing is applied as a railway vehicle axle bearing. However, the present invention is not limited to this, and other types of rolling bearings may be applied.

１０ 鉄道車両用軸受ユニット
２０ 複列円錐ころ軸受（鉄道車両車軸用軸受）
２１ 外輪
２２ 内輪
２２ａ 内周面
２２ｂ 端面
２２ｃ 面取り部
２３ 円錐ころ（転動体）
５０ 車軸 10 Railway Vehicle Bearing Unit 20 Double Row Conical Roller Bearing (Railway Vehicle Axle Bearing)
21 outer ring 22 inner ring 22a inner peripheral surface 22b end surface 22c chamfer 23 tapered roller (rolling element)
50 axles

Claims (4)

外輪と、内輪と、外輪と内輪との間に転動自在に配置される複数の転動体と、を有し、鉄道車両の車輪が端部に取り付けられる車軸を回転自在に支持する鉄道車両車軸用軸受において、
前記内輪の内周面と端面との間には、該内周面に対して１０〜１２°の角度で端面側に拡径するテーパ形状の面取り部が施されることを特徴とする鉄道車両車軸用軸受。 A railway vehicle axle that has an outer ring, an inner ring, and a plurality of rolling elements that are rotatably arranged between the outer ring and the inner ring, and that rotatably supports an axle on which a wheel of the railway vehicle is attached to an end. For bearings,
A railway vehicle characterized in that a tapered chamfered portion is provided between the inner peripheral surface and the end surface of the inner ring so as to expand toward the end surface at an angle of 10 to 12 ° with respect to the inner peripheral surface. Axle bearing. 前記面取り部は、前記内輪の内周面と前記面取り部との交点が、前記内輪の端面から５ｍｍ以内の範囲にあるように形成されることを特徴とする請求項１に記載の鉄道車両車軸用軸受。   2. The railway vehicle axle according to claim 1, wherein the chamfered portion is formed such that an intersection of an inner peripheral surface of the inner ring and the chamfered portion is within a range of 5 mm from an end surface of the inner ring. Bearings. 前記内輪の内周面と前記面取り部とは、前記内周面及び前記面取り部を接線とする所定の曲率半径を持った円弧面で繋がれていることを特徴とする請求項１または２に記載の鉄道車両車軸用軸受。   The inner peripheral surface of the inner ring and the chamfered portion are connected by an arc surface having a predetermined radius of curvature with the inner peripheral surface and the chamfered portion as a tangent line. The railcar axle bearing described. 前記車軸と前記内輪の内周面との嵌め合い面には、前記内輪を前記車軸に圧入する際に前記車軸の外周面に塗布された潤滑剤が保持されていることを特徴とする請求項１〜３のいずれか１項に記載の鉄道車両車軸用軸受。   The lubricant applied to the outer peripheral surface of the axle when the inner race is press-fitted into the axle is held on a fitting surface between the axle and the inner peripheral surface of the inner race. The bearing for railway vehicle axles of any one of 1-3.
JP2015084334A 2015-04-16 2015-04-16 Bearing for railway vehicle axle Pending JP2016205443A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109707739A (en) * 2018-12-29 2019-05-03 浙江环宇轴承有限公司 A kind of bearing assembly chamfer structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07293570A (en) * 1994-04-27 1995-11-07 Ntn Corp Axle bearing for vehicle
JP2005163873A (en) * 2003-12-01 2005-06-23 Nachi Fujikoshi Corp Rolling bearing
JP2006300215A (en) * 2005-04-20 2006-11-02 Ntn Corp Roller bearing
JP2009085418A (en) * 2007-10-03 2009-04-23 Jtekt Corp Rolling bearing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07293570A (en) * 1994-04-27 1995-11-07 Ntn Corp Axle bearing for vehicle
JP2005163873A (en) * 2003-12-01 2005-06-23 Nachi Fujikoshi Corp Rolling bearing
JP2006300215A (en) * 2005-04-20 2006-11-02 Ntn Corp Roller bearing
JP2009085418A (en) * 2007-10-03 2009-04-23 Jtekt Corp Rolling bearing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109707739A (en) * 2018-12-29 2019-05-03 浙江环宇轴承有限公司 A kind of bearing assembly chamfer structure

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