JP2008261368A - Tapered roller bearing - Google Patents

Tapered roller bearing Download PDF

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Publication number
JP2008261368A
JP2008261368A JP2007102857A JP2007102857A JP2008261368A JP 2008261368 A JP2008261368 A JP 2008261368A JP 2007102857 A JP2007102857 A JP 2007102857A JP 2007102857 A JP2007102857 A JP 2007102857A JP 2008261368 A JP2008261368 A JP 2008261368A
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Prior art keywords
diameter
ring
small
tapered roller
roller bearing
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JP2007102857A
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Japanese (ja)
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Yasuhiko Shimizu
保彦 清水
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2007102857A priority Critical patent/JP2008261368A/en
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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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/54—Cages for rollers or needles made from wire, strips, or sheet metal
    • F16C33/542—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal
    • F16C33/543—Cages for rollers or needles made from wire, strips, or sheet metal made from sheet metal from a single part
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6681—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
    • 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)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing in which a lubricating performance is well maintained for a long period and which is increased in the service life. <P>SOLUTION: This tapered roller bearing comprises an inner ring 2, an outer ring 3, a plurality of tapered rollers 4 rollingly disposed between the inner ring 2 and the outer ring 3, and a retainer 5 for holding the tapered rollers 4 at predetermined intervals in the circumferential direction. The retainer 51 has a small-diameter ring part 51, a large-diameter ring part 52, and a plurality of column parts 53 connecting the small-diameter ring part 51 to the large-diameter ring part 52. Pockets in which the tapered rollers 4 are disposed are formed between the column parts 53. A labyrinth structure is formed between the inner diameter part of the small-diameter ring part 51 and the outer peripheral surface of the inner ring 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、特に鉄道車両の車軸用装置に用いられる円すいころ軸受に関する。   The present invention particularly relates to a tapered roller bearing used in an apparatus for an axle of a railway vehicle.

鉄道車両の駆動装置や車軸用装置は、その主軸が転がり軸受により回転自在に支承されている（特許文献１）。図２に示す鉄道車両車軸用軸受は、車軸１０１の端部に配置した複列円すいころ軸受である。円すいころ軸受は、外輪１０３と内輪１０２ａ、１０２ｂとの間に、転動体（円すいころ）１０４ａ、１０４ｂが転動自在に介装されており、この転動体１０４ａ、１０４ｂを所定間隔に保持するための保持器１０５ａ、１０５ｂが設けられている。   The main shaft of a railway vehicle drive device or axle device is rotatably supported by a rolling bearing (Patent Document 1). The railcar axle bearing shown in FIG. 2 is a double-row tapered roller bearing disposed at the end of the axle 101. In the tapered roller bearing, rolling elements (conical rollers) 104a and 104b are interposed between an outer ring 103 and inner rings 102a and 102b so as to freely roll, and the rolling elements 104a and 104b are held at a predetermined interval. Cages 105a and 105b are provided.

保持器１０５ａ、１０５ｂは、円すいころ１０４ａ、１０４ｂの小径端面１０８ａ、１０８ｂ側で連なるリング状の小径リング部１１０ａ、１１０ｂと、円すいころ１０４ａ、１０４ｂの大径端面１０９ａ、１０９ｂ側で連なるリング状の大径リング部１１１ａ、１１１ｂと、これらのリング部を連結する複数の柱部１１２ａ、１１２ｂとからなる。この種の保持器は、小径リング部１１０ａ、１１０ｂと大径リング部１１１ａ、１１１ｂと柱部１１２ａ、１１２ｂとで円すいころ１０４ａ、１０４ｂが嵌合されるポケット１１３ａ、１１３ｂが形成される。
特開２００６−３２２５０４号公報 The cages 105a and 105b are ring-shaped small-diameter ring portions 110a and 110b that are continuous on the small-diameter end surfaces 108a and 108b of the tapered rollers 104a and 104b, and ring-shaped rings that are continuous on the large-diameter end surfaces 109a and 109b of the tapered rollers 104a and 104b. It consists of large-diameter ring portions 111a and 111b and a plurality of column portions 112a and 112b that connect these ring portions. In this type of cage, pockets 113a and 113b into which the tapered rollers 104a and 104b are fitted are formed by the small diameter ring portions 110a and 110b, the large diameter ring portions 111a and 111b, and the column portions 112a and 112b.
JP 2006-322504 A

前記のような円すいころ軸受は、保持器のポケット１１３ａ、１１３ｂと、転動体である円すいころ１０４ａ、１０４ｂの隙間に潤滑剤（グリース）が充填され、また、円すいころ１０４ａ、１０４ｂの表面にもグリースが塗布されている。このグリースによって潤滑が行なわれ、円すいころ１０４ａ、１０４ｂ、保持器１０５ａ、１０５ｂ、及び内外輪１０３、１０２ａ、１０２ｂの相互間の滑り摩擦や転がり摩擦を緩和している。   In the tapered roller bearing as described above, a lubricant (grease) is filled in a gap between the cage pockets 113a and 113b and the tapered rollers 104a and 104b as rolling elements, and the surfaces of the tapered rollers 104a and 104b are also filled. Grease is applied. Lubrication is performed by the grease, and sliding friction and rolling friction between the tapered rollers 104a and 104b, the cages 105a and 105b, and the inner and outer rings 103, 102a, and 102b are reduced.

円すいころ軸受の使用中において、軸受内部の内端側（円すいころの小径側）の空間Ｓ１内に充填されたグリースは、円すいころ軸受の回転によって、矢印Ａのように空間Ｓ１から軸方向外方側へ流れ込み、保持器１０５ａ、１０５ｂの内径側においては隙間Ｓ２を介して軸方向外方側へ流れる。そして、隙間Ｓ２から矢印Ｂのように、保持器の大径側（軸方向外方側）に流れつつ外輪側に流れ、矢印Ｃのように軸方向外端側へ流れる。なお、保持器１０５ａ、１０５ｂの外径側に流入したグリースは、外輪１０３の軌道面１０７ａ、１０７ｂと、保持器１０５ａ、１０５ｂの外径面に沿って矢印Ａ１、Ｃ１のように流れ、軸方向外端側へ流れる。   During use of the tapered roller bearing, grease filled in the space S1 on the inner end side (smaller diameter side of the tapered roller) inside the bearing is removed from the space S1 in the axial direction as indicated by an arrow A by the rotation of the tapered roller bearing. It flows into the outer side and flows axially outward through the gap S2 on the inner diameter side of the cages 105a and 105b. Then, as indicated by an arrow B from the gap S2, it flows to the outer ring side while flowing to the large diameter side (axially outward side) of the cage, and flows to the axially outer end side as indicated by an arrow C. The grease that has flowed into the outer diameter side of the cages 105a and 105b flows as indicated by arrows A1 and C1 along the raceway surfaces 107a and 107b of the outer ring 103 and the outer diameter surfaces of the cages 105a and 105b. It flows to the outer end side.

このため、空間Ｓ１内に充填されたグリースが早期に大量流出することにより、ころ１０４ａ、１０４ｂの外周面の潤滑が不十分になる可能性がある。これにより、潤滑不良による軸受の回転機能の劣化を引き起こすおそれがある。   For this reason, a large amount of grease filled in the space S1 may flow out early, which may result in insufficient lubrication of the outer peripheral surfaces of the rollers 104a and 104b. This may cause deterioration of the rotation function of the bearing due to poor lubrication.

特に、鉄道の車軸に用いられる車軸用軸受は屋外で使用されるため、多量の水（雨水や泥水等）及び塵埃に曝される等の過酷な環境で使用される。このため、軸受寿命の向上を図ることにより、信頼性・安全性を確保することが重要な課題である。   In particular, since axle bearings used for railway axles are used outdoors, they are used in harsh environments such as exposure to a large amount of water (rain water, muddy water, etc.) and dust. For this reason, it is an important issue to ensure reliability and safety by improving the bearing life.

本発明は、上記課題に鑑みて、潤滑性能を長期に亘って良好に維持するとともに、軸受寿命の向上を図ることができる円すいころ軸受を提供する。   In view of the above problems, the present invention provides a tapered roller bearing capable of maintaining good lubrication performance over a long period of time and improving the bearing life.

本発明の円すいころ軸受は、内輪と、外輪と、前記内輪と前記外輪との間に転動自在に配された複数の円すいころと、前記円すいころを円周所定間隔に保持する保持器とを備えた円すいころ軸受において、保持器が、小径リング部と、大径リング部と、小径リング部と大径リング部とを連結する複数本の柱部とを備え、この柱部間に円すいころが配置されるポケットが形成され、前記小径リング部の内径部と、内輪の外周面との間にラビリンス構造を形成したものである。   The tapered roller bearing of the present invention includes an inner ring, an outer ring, a plurality of tapered rollers that are arranged to roll between the inner ring and the outer ring, and a cage that holds the tapered rollers at predetermined circumferential intervals. In the tapered roller bearing with the cage, the cage includes a small-diameter ring portion, a large-diameter ring portion, and a plurality of column portions that connect the small-diameter ring portion and the large-diameter ring portion, and a conical portion is provided between the column portions. A pocket in which the roller is disposed is formed, and a labyrinth structure is formed between the inner diameter portion of the small-diameter ring portion and the outer peripheral surface of the inner ring.

本発明の円すいころ軸受によれば、小径リング部の内径部と、内輪の外周面の小径側端部とが微小隙間を介して対向するため、小径リング部の内径部と、内輪の外周面の小径側端部とが非接触の密封部となり、この非接触密封部をラビリンスシールとして機能させることができる。また、微小隙間を介して、軸受内部の内端側の空間に充填されるグリースが保持器の小径側から大径側へと微小流量で徐々に流れるように構成することができる。   According to the tapered roller bearing of the present invention, since the inner diameter portion of the small diameter ring portion and the small diameter side end portion of the outer peripheral surface of the inner ring face each other through a minute gap, the inner diameter portion of the small diameter ring portion and the outer peripheral surface of the inner ring The small-diameter side end of the non-contact portion becomes a non-contact sealing portion, and this non-contact sealing portion can function as a labyrinth seal. Further, the grease filled in the space on the inner end side inside the bearing can be configured to gradually flow at a minute flow rate from the small diameter side to the large diameter side of the cage through the minute gap.

保持器の小径リング部が、径方向内側に延びる端面部と、この端面部の径方向内側の縁に屈曲して連なると共に軸方向大径側に延びる内リング部とを有し、この内リング部の内周面を、内輪の外周面の小径側端部に対向させることができる。また、前記内輪の小径側に小鍔を設けて、この小鍔の外径面を前記内リング部の内周面に対向させることができる。   The small-diameter ring portion of the cage has an end surface portion that extends radially inward, and an inner ring portion that is bent and connected to the radially inner edge of the end surface portion and extends to the large-diameter side in the axial direction. The inner peripheral surface of the portion can be opposed to the small-diameter side end of the outer peripheral surface of the inner ring. Further, a small flange can be provided on the small diameter side of the inner ring, and the outer diameter surface of the small ring can be opposed to the inner peripheral surface of the inner ring portion.

前記保持器を、複列の軌道面を有する外輪と、複列に分離した内輪との間に円すいころが配置された複列円すいころ軸受に使用したり、鉄道車両の車軸用軸受装置に使用したりすることができる。   The cage is used for a double row tapered roller bearing in which a tapered roller is arranged between an outer ring having a double row raceway surface and an inner ring separated into a double row, or used for a bearing device for an axle of a railway vehicle. You can do it.

本発明の円すいころ軸受は、非接触密封部をラビリンスシールとして機能させることにより、軸受内部の内端側（円すいころの小径側）の空間内に充填されたグリースを長期に亘って保持することができる。このため、軸受内部の内端側の空間に充填されたグリースの軸方向外端側への早期における大量流出を防止することができる。しかも、保持器の小径側から大径側へと流れるグリースは微小流量であるので、ころの外周面及び両端面にグリースを徐々に供給することができ、潤滑性能を長期に亘って良好に維持するとともに、軸受寿命の向上を図ることができる。   The tapered roller bearing of the present invention retains the grease filled in the space on the inner end side (the small diameter side of the tapered roller) inside the bearing for a long period of time by causing the non-contact sealing portion to function as a labyrinth seal. Can do. For this reason, it is possible to prevent an early outflow of a large amount of grease filled in the space on the inner end side in the bearing toward the outer end side in the axial direction. Moreover, since the grease flowing from the small diameter side to the large diameter side of the cage is a minute flow rate, the grease can be gradually supplied to the outer peripheral surface and both end surfaces of the roller, and the lubrication performance is maintained well over a long period of time. In addition, the bearing life can be improved.

また、内リング部の内周面と、小鍔の外径面との間に微小隙間を形成することでき、この微小隙間を比較的長く形成することができて、ラビリンスシールを簡単かつ確実に形成することができるとともに、保持器の小径側から大径側へと微小流量でグリースを安定して供給することができる。   In addition, a minute gap can be formed between the inner peripheral surface of the inner ring portion and the outer diameter surface of the gavel, and this minute gap can be formed relatively long, making the labyrinth seal easy and reliable. It can be formed, and the grease can be stably supplied from the small diameter side to the large diameter side of the cage at a minute flow rate.

内輪の小径部に小鍔を設けたことによって、円すいころ軸受を組込むまでの間に円すいころが小端側に脱落するのを防止できて、組立性の向上を図ることができ、しかも、保持器の小径リング部を内径側にあまり延ばすことなくラビリンスシールを効果的に設けることができる。   By providing a small flange on the small diameter part of the inner ring, it is possible to prevent the tapered roller from falling off to the small end side before the tapered roller bearing is assembled, and it is possible to improve the assembling property and to maintain it. The labyrinth seal can be effectively provided without extending the small-diameter ring portion of the vessel to the inner diameter side.

前記保持器を用いることによって、軸受装置の潤滑性能を長期に亘って良好に維持することができる。このため、多量の水（雨水や泥水等）及び塵埃に曝される等の過酷な環境で使用される鉄道車両の車軸用軸受装置に特に最適となり、車軸用軸受装置として、長期に亘って安定した機能を発揮する。   By using the cage, the lubrication performance of the bearing device can be favorably maintained over a long period of time. For this reason, it is particularly suitable for axle bearing devices for railway vehicles used in harsh environments such as exposure to large amounts of water (rain water, muddy water, etc.) and dust, and stable as a bearing device for axles over a long period of time. The function which performed is demonstrated.

以下本発明の実施の形態を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１に示す鉄道車両車軸用軸受は、車軸１の端部１ａに配置した複列円すいころ軸受である。この複列円すいころ軸受は、外周面に円すい状の軌道面６ａ、６ｂを有する内輪２ａ、２ｂと、内周面に円すい状の軌道面７ａ、７ｂを有する外輪３と、内輪２ａ、２ｂの軌道面６ａ、６ｂと外輪３の軌道面７ａ、７ｂとの間に転動自在に介在させる複数の円すいころ４ａ、４ｂを備える。内輪の軌道面６ａ、６ｂと外輪の軌道面７ａ、７ｂとの間には、複数の円すいころ４ａ、４ｂを軸受周方向に所定の間隔を隔てて保持する保持器５ａ、５ｂを介在している。上記内輪２ａ、２ｂは、軌道面６ａ、６ｂの小径側に、径方向外側に突出する小鍔２１ａ、２１ｂを形成すると共に、軌道面６ａ、６ｂの大径側に、径方向外側に突出する大鍔２２ａ、２２ｂを形成している。   The railcar axle bearing shown in FIG. 1 is a double-row tapered roller bearing disposed at the end 1 a of the axle 1. This double row tapered roller bearing includes inner rings 2a and 2b having conical raceway surfaces 6a and 6b on the outer peripheral surface, an outer ring 3 having conical raceway surfaces 7a and 7b on the inner peripheral surface, and inner rings 2a and 2b. A plurality of tapered rollers 4a and 4b are provided between the raceway surfaces 6a and 6b and the raceway surfaces 7a and 7b of the outer ring 3 so as to be freely rollable. Between the inner raceway surfaces 6a and 6b and the outer raceway surfaces 7a and 7b, cages 5a and 5b for holding a plurality of tapered rollers 4a and 4b at predetermined intervals in the bearing circumferential direction are interposed. Yes. The inner rings 2a, 2b form small flanges 21a, 21b projecting radially outward on the small diameter side of the raceway surfaces 6a, 6b, and projecting radially outward on the large diameter side of the raceway surfaces 6a, 6b. Large bowls 22a and 22b are formed.

外輪３は軸箱（図示省略）に固定され、その軸箱は台枠等に固定される。内輪２ａ、２ｂは、軸端側（図１の左方）に位置する前蓋１２と、反軸端側（図１の右方）に位置する後蓋１６との間に挟み込んである。前蓋１２と内輪２ａとの間には油切り１４が介在させてある。前蓋１２は車軸１の軸端にボルト１８で固定してある。後蓋１６は一方で内輪２ｂと接し、他方で車軸１の段部１ｂに接している。密封装置２０は外輪３の両端開口部に装着したシールケース２３と、シールケース２２の内部に保持させたオイルシール２４とで構成される。   The outer ring 3 is fixed to a shaft box (not shown), and the shaft box is fixed to a frame or the like. The inner rings 2a and 2b are sandwiched between a front lid 12 located on the shaft end side (left side in FIG. 1) and a rear lid 16 located on the opposite shaft end side (right side in FIG. 1). An oil drain 14 is interposed between the front lid 12 and the inner ring 2a. The front lid 12 is fixed to the shaft end of the axle 1 with bolts 18. The rear lid 16 is in contact with the inner ring 2b on the one hand and the step 1b of the axle 1 on the other hand. The sealing device 20 includes a seal case 23 attached to both end openings of the outer ring 3 and an oil seal 24 held inside the seal case 22.

前記保持器５ａ、５ｂは、この種の保持器に一般的に使用される金属製であって、小径側に小径リング部５１ａ、５１ｂを有すると共に、大径側に大径リング部５２ａ、５２ｂを有し、これら小径リング部５１ａ、５１ｂと大径リング部５２ａ、５２ｂとの間に、概ね軸線方向に延びる複数本の柱部５３ａ、５３ｂを有している。この柱部相互間に、円すいころ４ａ、４ｂを保持するポケット５６ａ、５６ｂを形成している。   The cages 5a and 5b are made of metal generally used for this type of cage and have small diameter ring portions 51a and 51b on the small diameter side and large diameter ring portions 52a and 52b on the large diameter side. There are a plurality of column portions 53a, 53b extending substantially in the axial direction between the small diameter ring portions 51a, 51b and the large diameter ring portions 52a, 52b. Pockets 56a and 56b for holding the tapered rollers 4a and 4b are formed between the column portions.

前記保持器５ａ、５ｂの小径リング部５１ａ、５１ｂは、径方向内側に延びる端面部５４ａ、５４ｂと、この端面部５４ａ、５４ｂの径方向内側の縁に屈曲して連なると共に大径側に延びる内リング部５５ａ、５５ｂとを有する。端面部５４ａ、５４ｂと内リング部５５ａ、５５ｂはＪ字形状をなす。   The small-diameter ring portions 51a and 51b of the cages 5a and 5b are bent and connected to the end surface portions 54a and 54b extending radially inward and the radially inner edges of the end surface portions 54a and 54b, and extend to the large diameter side. And inner ring portions 55a and 55b. The end surface portions 54a and 54b and the inner ring portions 55a and 55b are J-shaped.

この保持器５ａ、５ｂは、小径リング部５１ａ、５１ｂの内径部を、内輪２ａ、２ｂの外周面の小径側端部と微小隙間Ｓを介して対向するように配置している。具体的には、内リング部５５ａ、５５ｂの内周面が、内輪の小鍔２１ａ、２１ｂの外周面に対向している。内リング部５５ａ、５５ｂの内周面と、内輪の小鍔２１ａ、２１ｂの外径面とが非接触の密封部となり、この非接触密封部にてラビリンスシールを構成している。   The cages 5a and 5b are arranged so that the inner diameter portions of the small-diameter ring portions 51a and 51b face the small-diameter side ends of the outer peripheral surfaces of the inner rings 2a and 2b with a minute gap S therebetween. Specifically, the inner peripheral surfaces of the inner ring portions 55a and 55b are opposed to the outer peripheral surfaces of the small rings 21a and 21b of the inner ring. The inner peripheral surfaces of the inner ring portions 55a and 55b and the outer diameter surfaces of the inner ring small collars 21a and 21b form a non-contact sealing portion, and the non-contact sealing portion constitutes a labyrinth seal.

車軸１の回転時における軸受内の潤滑剤（グリース）の挙動について述べる。円すいころ軸受の使用中において、軸受内部の内端側（円すいころの小径側）の空間Ｓ０内に充填されたグリースは、円すいころ軸受の回転によって、矢印Ａのように空間Ｓ０から軸方向外方側（円すいころの大径側）へ流れ込む。保持器５ａ、５ｂの内径側においては微小隙間Ｓを介して軸方向外方側へ流れる。そして、微小隙間Ｓから矢印Ｂのように、保持器の大径側（軸方向外方）に流れつつ外輪側に流れ、最終的には矢印Ｃのように、軸方向外端側へ流れる。なお、保持器５ａ、５ｂの外径側に流入したグリースは、外輪３の軌道面７ａ、７ｂと、保持器５ａ、５ｂの外径面に沿って矢印Ａ１、Ｃ１のように流れ、軸方向外端側へ流れる。   The behavior of the lubricant (grease) in the bearing during rotation of the axle 1 will be described. During use of the tapered roller bearing, the grease filled in the space S0 on the inner end side (smaller diameter side of the tapered roller) inside the bearing is removed from the space S0 in the axial direction as indicated by the arrow A by the rotation of the tapered roller bearing. It flows into the side (large diameter side of the tapered roller). On the inner diameter side of the cages 5a and 5b, the cage flows through the minute gap S outward in the axial direction. Then, as indicated by an arrow B from the minute gap S, it flows to the outer ring side while flowing to the large diameter side (axially outward) of the cage, and finally flows to the axially outer end side as indicated by an arrow C. The grease flowing into the outer diameter side of the cages 5a and 5b flows as indicated by arrows A1 and C1 along the raceway surfaces 7a and 7b of the outer ring 3 and the outer diameter surfaces of the cages 5a and 5b. It flows to the outer end side.

このように、本発明の円すいころ軸受では、内リング部５５ａ、５５ｂの内周面と、内輪の小鍔２１ａ、２１ｂの外径面とが微小隙間Ｓを介して対向するため、内リング部５５ａ、５５ｂの内周面と、内輪の小鍔２１ａ、２１ｂの外径面とが非接触の密封部となり、この非接触密封部をラビリンスシールとして機能させることができる。これにより、空間Ｓ０内に充填されたグリースを長期に亘って保持することができる。このため、空間Ｓ０に充填されたグリースの軸方向外端側への早期における大量流出を防止することができる。   As described above, in the tapered roller bearing of the present invention, the inner circumferential surface of the inner ring portions 55a and 55b and the outer diameter surface of the inner ring gavel 21a and 21b are opposed to each other through the minute gap S. The inner peripheral surfaces of 55a and 55b and the outer diameter surfaces of the small rings 21a and 21b of the inner ring serve as a non-contact sealing portion, and this non-contact sealing portion can function as a labyrinth seal. Thereby, the grease filled in the space S0 can be held for a long time. For this reason, it is possible to prevent early outflow of a large amount of grease filled in the space S0 toward the outer end in the axial direction.

しかも、微小隙間Ｓを介して、空間Ｓ０に充填されるグリースが保持器５ａ、５ｂの小径側から大径側へと微小流量で徐々に流れるように構成することができる。このため、ころの外周面及び両端面にグリースを徐々に供給することができ、潤滑性能を長期に亘って良好に維持するとともに、軸受寿命の向上を図ることができる。   Moreover, the grease filled in the space S0 can be configured to gradually flow from the small diameter side to the large diameter side of the cages 5a and 5b with a small flow rate through the small gap S. For this reason, grease can be gradually supplied to the outer peripheral surface and both end surfaces of the roller, the lubrication performance can be maintained well over a long period of time, and the bearing life can be improved.

特に前記実施形態のように、保持器５ａ、５ｂの小径リング部５１ａ、５１ｂが、径方向内側に延びる端面部５４ａ、５４ｂと、この端面部５４ａ、５４ｂの径方向内側の縁に屈曲して連なると共に大径側に延びる内リング部５５ａ、５５ｂとを有するものであれば、この内リング部５５ａ、５５ｂの内周面を、内輪の小鍔２１ａ、２１ｂの外周面に対向させることができる。これにより、内リング部５５ａ、５５ｂの内周面と、小鍔２１ａ、２１ｂの外径面との間に微小隙間Ｓを形成することでき、この微小隙間Ｓを比較的長く形成することができて、ラビリンスシールを簡単かつ確実に形成することができるとともに、保持器５ａ、５ｂの小径側から大径側へと微小流量でグリースを安定して供給することができる。   In particular, as in the above-described embodiment, the small-diameter ring portions 51a and 51b of the cages 5a and 5b are bent to the end surface portions 54a and 54b extending radially inward and the radially inner edges of the end surface portions 54a and 54b. If the inner ring portions 55a and 55b are continuous and extend to the large diameter side, the inner peripheral surfaces of the inner ring portions 55a and 55b can be made to face the outer peripheral surfaces of the small rings 21a and 21b of the inner ring. . As a result, a minute gap S can be formed between the inner peripheral surface of the inner ring portions 55a and 55b and the outer diameter surface of the gavel 21a and 21b, and this minute gap S can be formed relatively long. Thus, the labyrinth seal can be formed easily and reliably, and the grease can be stably supplied from the small diameter side to the large diameter side of the cages 5a and 5b with a minute flow rate.

前記内輪２ａ、２ｂの小径側に小鍔２１ａ、２１ｂを設けて、この小鍔２１ａ、２１ｂの外径面を前記内リング部５５ａ、５５ｂの内周面に対向させることができる。これにより、円すいころ軸受を組込むまでの間に円すいころ４ａ、４ｂが小端側に脱落するのを防止できて、組立性の向上を図ることができ、しかも、保持器５ａ、５ｂの小径リング部５１ａ、５１ｂを内径側にあまり延ばすことなくラビリンスシールを効果的に設けることができる。   Small collars 21a and 21b are provided on the small diameter side of the inner rings 2a and 2b, and the outer diameter surfaces of the small collars 21a and 21b can be opposed to the inner peripheral surfaces of the inner ring portions 55a and 55b. As a result, it is possible to prevent the tapered rollers 4a and 4b from falling off to the small end side before the tapered roller bearings are assembled, and to improve the assemblability. In addition, the small diameter rings of the cages 5a and 5b The labyrinth seal can be effectively provided without extending the portions 51a and 51b to the inner diameter side.

前記保持器５ａ、５ｂは、多量の水（雨水や泥水等）及び塵埃に曝される等の過酷な環境で使用される鉄道車両の車軸用軸受装置に特に最適となり、車軸用軸受装置として、長期に亘って安定した機能を発揮する。   The cages 5a and 5b are particularly suitable for an axle bearing device of a railway vehicle used in a harsh environment such as being exposed to a large amount of water (rain water, muddy water, etc.) and dust. Demonstrate stable function over a long period of time.

以上、本発明の実施形態につき説明したが、本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、保持器は必ずしも金属製である必要はなく、例えば樹脂製とすることもできる。また、鉄道車両の車軸用軸受装置以外のものにも適用することが可能であり、単列で使用することも可能である。   As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the cage does not necessarily need to be made of metal. It can also be. Further, the present invention can be applied to devices other than the bearing device for an axle of a railway vehicle, and can be used in a single row.

本発明の実施形態を示す円すいころ軸受の要部断面図である。It is principal part sectional drawing of the tapered roller bearing which shows embodiment of this invention. 前記図１の円すいころ軸受の要部拡大断面図である。It is a principal part expanded sectional view of the tapered roller bearing of the said FIG.

符号の説明Explanation of symbols

２ 内輪
３ 外輪
４ 円すいころ
５ 保持器
５１ 小径リング部
５２ 大径リング部
５３ 柱部
５４ 端面部
５５ 内リング部
Ｓ 微小隙間 2 Inner ring 3 Outer ring 4 Tapered roller 5 Cage 51 Small-diameter ring part 52 Large-diameter ring part 53 Column part 54 End face part 55 Inner ring part S Minute gap

Claims (5)

内輪と、外輪と、前記内輪と前記外輪との間に転動自在に配された複数の円すいころと、前記円すいころを円周所定間隔に保持する保持器とを備えた円すいころ軸受において、
保持器が、小径リング部と、大径リング部と、小径リング部と大径リング部とを連結する複数本の柱部とを備え、この柱部間に円すいころが配置されるポケットが形成され、
前記小径リング部の内径部と、内輪の外周面との間にラビリンス構造を形成したことを特徴とする円すいころ軸受。 In a tapered roller bearing comprising an inner ring, an outer ring, a plurality of tapered rollers arranged to roll between the inner ring and the outer ring, and a retainer for holding the tapered rollers at a predetermined circumferential interval,
The cage includes a small-diameter ring portion, a large-diameter ring portion, and a plurality of pillar portions that connect the small-diameter ring portion and the large-diameter ring portion, and a pocket is formed between which the tapered rollers are disposed. And
A tapered roller bearing wherein a labyrinth structure is formed between an inner diameter portion of the small-diameter ring portion and an outer peripheral surface of an inner ring. 保持器の小径リング部が、径方向内側に延びる端面部と、この端面部の径方向内側の縁に屈曲して連なると共に軸方向大径側に延びる内リング部とを有し、この内リング部の内周面を、内輪の外周面の小径側端部に対向させたことを特徴とする請求項１の円すいころ軸受。   The small-diameter ring portion of the cage has an end surface portion that extends radially inward, and an inner ring portion that is bent and connected to the radially inner edge of the end surface portion and extends to the large-diameter side in the axial direction. 2. The tapered roller bearing according to claim 1, wherein an inner peripheral surface of the portion is opposed to a small diameter side end portion of the outer peripheral surface of the inner ring. 前記内輪の小径側に小鍔を設けて、この小鍔の外径面を前記内リング部の内周面に対向させたことを特徴とする請求項２の円すいころ軸受。   The tapered roller bearing according to claim 2, wherein a small flange is provided on a small diameter side of the inner ring, and an outer diameter surface of the small ring is opposed to an inner peripheral surface of the inner ring portion. 前記保持器を、複列の軌道面を有する外輪と、複列に分離した内輪との間に円すいころが配置された複列円すいころ軸受に使用したことを特徴とする請求項１〜３のいずれか１項の円すいころ軸受。   The said retainer was used for the double row tapered roller bearing by which the tapered roller was arrange | positioned between the outer ring | wheel which has a double row raceway surface, and the inner ring | wheel isolate | separated into the double row | line | column. The tapered roller bearing according to any one of the items. 前記請求項１〜請求項４のいずれかに記載の円すいころ軸受であって、鉄道車両の車軸用軸受装置に使用されることを特徴とする円すいころ軸受。   The tapered roller bearing according to any one of claims 1 to 4, wherein the tapered roller bearing is used in a bearing device for an axle of a railway vehicle.
JP2007102857A 2007-04-10 2007-04-10 Tapered roller bearing Withdrawn JP2008261368A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204068A (en) * 2008-02-27 2009-09-10 Nsk Ltd Tapered roller bearing
WO2014171405A1 (en) * 2013-04-17 2014-10-23 Ntn株式会社 Tapered roller bearing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009204068A (en) * 2008-02-27 2009-09-10 Nsk Ltd Tapered roller bearing
WO2014171405A1 (en) * 2013-04-17 2014-10-23 Ntn株式会社 Tapered roller bearing
JP2014211175A (en) * 2013-04-17 2014-11-13 Ntn株式会社 Conical roller bearing
US10208797B2 (en) 2013-04-17 2019-02-19 Ntn Corporation Tapered roller bearing

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