JP4103501B2 - Tapered roller bearings - Google Patents

Tapered roller bearings Download PDF

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Publication number
JP4103501B2
JP4103501B2 JP2002246767A JP2002246767A JP4103501B2 JP 4103501 B2 JP4103501 B2 JP 4103501B2 JP 2002246767 A JP2002246767 A JP 2002246767A JP 2002246767 A JP2002246767 A JP 2002246767A JP 4103501 B2 JP4103501 B2 JP 4103501B2
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JP
Japan
Prior art keywords
lubricating oil
cage
inner ring
tapered roller
ring
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Expired - Fee Related
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JP2002246767A
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Japanese (ja)
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JP2004084799A (en
Inventor
章之 鈴木
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JTEKT Corp
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JTEKT Corp
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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
    • 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
    • F16C19/36—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 a single row of rollers
    • F16C19/364—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 a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • 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
    • F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
    • F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
    • 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
    • F16C33/467—Details of individual pockets, e.g. shape or roller retaining means
    • F16C33/4676—Details of individual pockets, e.g. shape or roller retaining means of the stays separating adjacent cage pockets, e.g. guide means for the bearing-surface of the rollers
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、円錐ころ軸受に関する。
【０００２】
【従来の技術】
円錐ころ軸受には、内輪と外輪との間に複数の円錐ころが保持器により保持された状態で介装され、かつ、当該軸受の動作時に前記内輪の軸方向一方の大鍔部内面に前記円錐ころの軸方向一方の大径側端面がすべり接触するものがある。例えば、自動車の変速機に用いられる円錐ころ軸受の場合、前記内・外輪間の環状空間において、前記各円錐ころおよび前記保持器により仕切られてできる空間が潤滑油流路とされ、外部から潤滑油が供給されるようになっている。
【０００３】
【発明が解決しようとする課題】
ところで、上記潤滑油は、内輪や外輪あるいは円錐ころの動作時に攪拌されることとなるが、従来の円錐ころ軸受の場合、その保持器の肉厚が径方向に薄肉とされてその潤滑油流路が広くなって供給される潤滑油量が多量となっており、それだけ潤滑油の前記攪拌抵抗が大きくなり、高回転域での回転トルクが増大するなど、当該円錐ころ軸受の円滑な動作を妨げる傾向となる。
【０００４】
また、従来の保持器の場合、その内径面が内輪の大鍔部の外径面より外径側に位置付けられていたから、前記潤滑油流路を出てきた潤滑油が当該軸受の動作に伴なって作用する回転遠心力により前記すべり接触部位に到達しにくく、そのため、すべり接触部位に対する潤滑が不十分なものとなるおそれがある。
【０００９】
【課題を解決するための手段】
本発明の円錐ころ軸受は、内輪と外輪との間に複数の円錐ころが保持器により保持された状態で介装され、当該軸受の動作時に前記内輪の軸方向一方の大鍔部内面に前記円錐ころの軸方向一方の大径側端面がすべり接触し、前記内・外輪間の環状空間において、前記各円錐ころおよび前記保持器により仕切られてできる空間が潤滑油流路とされる円錐ころ軸受であって、前記保持器は、樹脂を素材にして作られており、かつ、周方向に複数の柱部で仕切られて前記複数の円錐ころをそれぞれ保持する複数のポケットを有し、その柱部がその周方向のほぼ全体にわたって径方向に厚肉にされていることにより当該柱部の内径面と前記内輪の外径面との間の前記潤滑油流路が狭くされているとともに、その内径面が前記内輪の大鍔部の外径面よりも内径側に位置付けられて前記潤滑油流路が前記内輪の大鍔部内面に対向させられており、かつ、前記保持器の柱部の内径面には軸方向一方に向けて断面が狭くなる潤滑油案内溝が当該軸方向に沿って設けられており、前記柱部の軸方向一方の端部内径側に、前記潤滑油案内溝の出口へ案内されてきた潤滑油を、前記内輪の大鍔部内面から大鍔部外径側へと案内する案内路が設けられていることを特徴とする。
【００１０】
本発明によれば、保持器の柱部がその周方向のほぼ全体にわたって径方向に厚肉にされていることにより当該柱部の内径面と前記内輪の外径面との間の潤滑油流路が狭くされていることから、潤滑油が多量にならずに済み、その分、当該軸受の動作時における潤滑油の攪拌抵抗が小さくなり、高回転域での回転トルクが低減するなど、円錐ころ軸受の動作を円滑にすることができる。また、保持器柱部の内径面が内輪の大鍔部の外径面より内径側に位置付けられているから、前記潤滑油流路を出てきた潤滑油に対して当該軸受の動作に伴なう回転遠心力が作用しても容易にすべり接触部位に到達しやすくすべり接触部位に対する潤滑を十分なものにすることができる。また、前記柱部の軸方向一方の端部内径側に、前記潤滑油案内溝の出口から案内されてきた潤滑油を、前記内輪の大鍔部内面から大鍔部外径側へと案内する案内路が設けられているから、すべり接触部位に供給されてきた潤滑油をその後、案内路を流れて大鍔部の外径側へ円滑に案内させることができる。
【００１１】
【発明の実施の形態】
本発明の詳細を図面に示す実施の形態に基づいて説明する。図１ないし図４は、本発明の実施形態を示す。図１は、本発明の実施形態に係る円錐ころ軸受の全体断面図、図２は、図１の保持器の一部を破断して示す斜視図、図３は、図１の円錐ころの回転軸心に対して垂直に切ったＡ−Ａ線に沿う断面図、図４は、図１の上半分を拡大して示す断面図である。
【００１２】
円錐ころ軸受１は、内輪２、外輪３、円錐ころ４および保持器５を備える。内輪２は、小径端２１と大径端２２とを有する。内輪２の小径端側の外周面には径方向に突出する小鍔部２４が、また、内輪２の大径端側の外周面には径方向に突出する大鍔部２５が、それぞれ設けられている。内輪２の軸方向中間位置の外周面は軸方向一方に向けて漸次拡径するテーパ状の内輪軌道面２３とされている。外輪３は、内輪２の外径側において内輪２と同心に配置され、内周面に軸方向一方に向けて漸次拡径するテーパ状の外輪軌道面３１を有する。円錐ころ４は、内・外輪２，３の各軌道面２３，３１間において、保持器５によって円周方向等配位置に転動自在に複数個保持されており、その軸方向一方の端面４ａは、内輪２の大鍔部２５の内面２５ａとすべり接触するようになっている。
【００１３】
保持器５は、樹脂製の環体であり、円周方向等配位置に複数の円錐ころ４を一つずつ収容して保持する複数のポケット５１と、これら各ポケット５１間を周方向に仕切る柱部５２とを有する。保持器５に使用する樹脂素材としては、潤滑油中の添加剤等に対して劣化しにくいものが適しており、例えばポリアミド(特に６，６−ナイロン)が挙げられる。
【００１４】
保持器５の柱部５２は、円錐ころ４を保持器５の内径側および外径側の双方から抜け止めするようになっている。つまり、ポケット５１の外径側の開口５３における各柱部５２の外径側対向間の距離Ｗ1と、円錐ころ４の直径Ｄとの関係が、Ｗ1＞Ｄとなるように設定されているとともに、ポケット５１の内径側の開口５４における各柱部５２の内径側対向間の距離Ｗ2と、円錐ころ４の直径Ｄとの関係が、Ｗ2＞Ｄとなるように設定されている。
【００１５】
保持器５の柱部５２は、その周方向のほぼ全体にわたって径方向に厚肉にされていることにより当該柱部５２の内径面５２ａと内輪２の外径面との間が狭くされているとともに、その内径面５２ａは、大鍔部２５の外径面２５ｂよりも内径側に位置するようになっている。内・外輪２，３間の環状空間において、各円錐ころ４および保持器５により仕切られてできる空間が潤滑油流路６となり、潤滑油６１はこの潤滑油流路６を、図中一点鎖線および二点鎖線で示すように流れる。各円錐ころ４と保持器５の柱部５２の内径面５２ａと、内輪２の外径面との間の潤滑油流路６が、大鍔部２５の内面２５ａに対向させられている。
【００１６】
保持器５における柱部５２の内径面５２ａには、大鍔部２５の内面２５ａに向けて潤滑油６１を案内する潤滑油案内溝５５が形成されている。潤滑油案内溝５５は、径方向断面がほぼ逆Ｕ字形の溝状に形成されており、二つの向かい合う壁部５５ａ，５５ｂと、これら壁部５５ａ，５５ｂを連接する径方向断面が半円形状の底部５５ｃとからなる。
【００１７】
この潤滑油案内溝５５において、内輪２の小径端側の開口が潤滑油６１の入口５６となり、内輪２の大径端側の開口が潤滑油６１の出口５７となる。この出口５７は、大鍔部２５の内面２５ａに対向配置されており、また、潤滑油案内溝５５の底部５５ｃは、大鍔部２５の外径面よりも内径側に位置するようになっている。潤滑油案内溝５５は、入口５６から出口５７に向けてその断面が狭くなる形状にされている。
【００１８】
前記柱部５２の軸方向一方の端部内径側に、前記潤滑油案内溝５５の出口５７へ案内されてきた潤滑油６１を、前記内輪２の大鍔部２５の内面２５ａから大鍔部２５の外径側へと案内する環状の案内路５９が設けられている。
【００１９】
以上の構成の円錐ころ軸受１では、保持器５の柱部５２がその周方向のほぼ全体にわたって径方向に厚肉にされていることにより当該柱部５２の内径面５２ａと前記内輪２の外径面との間の潤滑油流路６が狭くされているから、潤滑油６１が多量にならずに済み、その分、当該軸受の動作時における潤滑油６１の攪拌抵抗が小さくなり、高回転域での回転トルクが低減するなど、円錐ころ軸受１の動作を円滑にすることができる。また、保持器５の柱部５２の内径面５２ａが内輪２の大鍔部２５の外径面２５ｂより内径側に位置付けられているから、潤滑油６１は、図中二点鎖線で示すように、軸受の動作に伴なう回転遠心力が作用しても容易にすべり接触部位に到達しやすくなる。したがって、すべり接触部位に対する潤滑を十分なものにすることができる。
【００２０】
また、保持器５の柱部５２の内径面５２ａには潤滑油案内溝５５を設けているため、潤滑油６１は、図中三点鎖線で示すように、この潤滑油案内溝５５を流れることとなる。したがって、より潤滑油６１をすべり接触部位に供給しやすくなり、一層すべり接触部位の潤滑が向上する。
【００２１】
また、保持器５の柱部５２の軸方向一方の端部内径側に、潤滑油案内溝５５の出口５７から案内されてきた潤滑油６１を、内輪２の大鍔部２５の内面２５ａから大鍔部２５の外径側へと案内する案内路５９が設けられている。そのため、潤滑油６１は、図中二点鎖線および三点鎖線で示すように、すべり接触部位に供給された後、図中破線で示すように、案内路５９を流れて大鍔部２５の外径側へ円滑に案内されるようになる。
【００２２】
また、潤滑油案内溝５５が入口５６から出口５７にかけてその断面積が小さくなっているため、入口５６から流入する潤滑油６１が入口５６よりも面積の狭い出口５７へ案内される際、潤滑油６１の流れが層流的になる。
【００２３】
このように、本発明の実施形態における円錐ころ軸受１では、円錐ころ軸受１の回転動作に伴なう潤滑油６１の攪拌抵抗を抑制して回転トルクを低く抑えつつ、円錐ころ軸受１のすべり接触部位に対して潤滑油６１を十分に供給できるようになる。
【００２４】
【発明の効果】
以上述べたように、本発明によれば、円錐ころ軸受の回転動作に伴なう潤滑油の攪拌抵抗を抑制して回転トルクを低く抑えつつ、円錐ころ軸受のすべり接触部位に対して潤滑油を十分に供給できるようになる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る円錐ころ軸受の全体断面図
【図２】図１の円錐ころ軸受における保持器の一部破断斜視図
【図３】図１の円錐ころの回転軸心に対して垂直に切ったＡ−Ａ断面図
【図４】図１の半断面図
【符号の説明】
１ 円錐ころ軸受
２ 内輪
３ 外輪
４ 円錐ころ
５ 保持器
６ 潤滑油流路
２５ 大鍔部
２５ａ すべり接触面
２５ｂ 外径面
５２ 柱部
５２ａ 内径面
５５ 潤滑油案内溝
５７ 出口
５９ 案内路
６１ 潤滑油[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tapered roller bearing.
[0002]
[Prior art]
In the tapered roller bearing, a plurality of tapered rollers are interposed between an inner ring and an outer ring in a state of being held by a cage, and when the bearing is operated, Some tapered rollers have a sliding contact with one axial end face in the axial direction. For example, in the case of a tapered roller bearing used in an automobile transmission, in the annular space between the inner and outer rings, a space formed by the tapered rollers and the cage is used as a lubricating oil flow path, and lubrication is performed from the outside. Oil is supplied.
[0003]
[Problems to be solved by the invention]
By the way, the lubricating oil is agitated during the operation of the inner ring, the outer ring or the tapered roller. However, in the case of a conventional tapered roller bearing, the thickness of the cage is reduced in the radial direction so that the lubricating oil flow is reduced. As the amount of lubricating oil supplied increases due to the wide road, the stirring resistance of the lubricating oil increases, and the rotational torque in the high rotation range increases. It tends to interfere.
[0004]
Further, in the case of the conventional cage, since the inner diameter surface is positioned on the outer diameter side from the outer diameter surface of the large collar portion of the inner ring, the lubricating oil that has exited the lubricating oil flow path is accompanied by the operation of the bearing. It is difficult to reach the sliding contact portion due to the rotating centrifugal force acting in this manner, and therefore there is a risk that lubrication to the sliding contact portion will be insufficient.
[0009]
[Means for Solving the Problems]
The tapered roller bearing of the present invention is interposed between an inner ring and an outer ring in a state where a plurality of tapered rollers are held by a cage, and the inner ring is provided on the inner surface of one of the axial directions of the inner ring during operation of the bearing. A tapered roller in which one end surface on the large-diameter side in the axial direction of the tapered roller is in sliding contact, and in the annular space between the inner and outer rings, a space formed by the tapered rollers and the cage is a lubricating oil flow path. The cage is made of resin, and has a plurality of pockets that are partitioned by a plurality of pillars in the circumferential direction to hold the plurality of tapered rollers, respectively. The column portion is thickened in the radial direction over substantially the entire circumferential direction, thereby narrowing the lubricating oil passage between the inner diameter surface of the column portion and the outer diameter surface of the inner ring , its inner diameter surface is than the outer diameter surface of the large rib portion of the inner ring The lubricating oil flow path positioned on the inner diameter side is opposed to the inner surface of the large collar portion of the inner ring, and the inner diameter surface of the pillar portion of the cage has a cross-section narrowing toward one axial direction. An oil guide groove is provided along the axial direction, and the lubricating oil guided to the outlet of the lubricating oil guide groove on the inner diameter side of one end in the axial direction of the column portion A guide path is provided for guiding from the inner surface of the part to the outer diameter side of the large collar part.
[0010]
According to the onset bright, lubricating oil between the outer diameter surface of the inner ring and the inner surface of the pillar portion by pillar portion of the cage is to thick in the radial direction over substantially the entire circumferential direction thereof Since the flow path is narrowed, it is not necessary to increase the amount of lubricating oil, and accordingly, the stirring resistance of the lubricating oil during operation of the bearing is reduced, and the rotational torque in the high rotation range is reduced. The operation of the tapered roller bearing can be made smooth. Further, since the inner diameter surface of the retainer column portion is positioned on the inner diameter side from the outer diameter surface of the large collar portion of the inner ring, it is accompanied by the operation of the bearing against the lubricating oil that has exited the lubricating oil flow path. Even if the centrifugal force acts, it can easily reach the sliding contact portion, and the sliding contact portion can be sufficiently lubricated. Also, the lubricating oil guided from the outlet of the lubricating oil guide groove is guided from the inner surface of the large collar portion of the inner ring to the outer diameter side of the large collar portion toward the inner diameter side of one end of the column portion in the axial direction. Since the guide path is provided, the lubricating oil that has been supplied to the sliding contact portion can then flow through the guide path and be smoothly guided to the outer diameter side of the large collar portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on an embodiment shown in the drawings. 1 to 4 show an embodiment of the present invention. 1 is an overall cross-sectional view of a tapered roller bearing according to an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the retainer of FIG. 1 in a cutaway view, and FIG. 3 is a rotation of the tapered roller of FIG. 4 is a cross-sectional view showing the upper half of FIG. 1 in an enlarged manner. FIG. 4 is a cross-sectional view taken along line AA cut perpendicular to the axis.
[0012]
The tapered roller bearing 1 includes an inner ring 2, an outer ring 3, a tapered roller 4 and a cage 5. The inner ring 2 has a small diameter end 21 and a large diameter end 22. A small flange portion 24 that protrudes in the radial direction is provided on the outer peripheral surface on the small diameter end side of the inner ring 2, and a large flange portion 25 that protrudes in the radial direction is provided on the outer peripheral surface on the large diameter end side of the inner ring 2. ing. The outer peripheral surface of the inner ring 2 at the intermediate position in the axial direction is a tapered inner ring raceway surface 23 that gradually increases in diameter toward one side in the axial direction. The outer ring 3 is disposed concentrically with the inner ring 2 on the outer diameter side of the inner ring 2 and has a tapered outer ring raceway surface 31 that gradually increases in diameter toward one axial direction on the inner peripheral surface. A plurality of the tapered rollers 4 are held between the raceway surfaces 23 and 31 of the inner and outer rings 2 and 3 by a cage 5 so as to be able to roll in a circumferentially equidistant position, and one end face 4a in the axial direction thereof. Is in sliding contact with the inner surface 25a of the large collar portion 25 of the inner ring 2.
[0013]
The cage 5 is a resin ring, and a plurality of pockets 51 that respectively accommodate and hold a plurality of tapered rollers 4 at circumferentially equidistant positions, and the pockets 51 are partitioned in the circumferential direction. And a column part 52. As the resin material used for the cage 5, those which are not easily deteriorated with respect to the additives in the lubricating oil are suitable, and examples thereof include polyamide (particularly 6,6-nylon).
[0014]
The column portion 52 of the cage 5 prevents the tapered roller 4 from coming off from both the inner diameter side and the outer diameter side of the cage 5. That is, the relationship between the distance W 1 between the outer diameter side oppositions of the column portions 52 in the opening 53 on the outer diameter side of the pocket 51 and the diameter D of the tapered roller 4 is set to satisfy W 1 > D. In addition, the relationship between the distance W 2 between the opposed inner diameter sides of the column portions 52 in the opening 54 on the inner diameter side of the pocket 51 and the diameter D of the tapered roller 4 is set to satisfy W 2 > D. .
[0015]
The column portion 52 of the cage 5 is thickened in the radial direction over substantially the entire circumferential direction thereof, thereby narrowing the space between the inner diameter surface 52a of the column portion 52 and the outer diameter surface of the inner ring 2. At the same time, the inner diameter surface 52a is positioned closer to the inner diameter side than the outer diameter surface 25b of the large collar 25. In the annular space between the inner and outer rings 2, 3, the space formed by the tapered rollers 4 and the cage 5 becomes a lubricating oil flow path 6, and the lubricating oil 61 passes this lubricating oil flow path 6 along the one-dot chain line in the figure. And flows as shown by the two-dot chain line. The lubricating oil flow path 6 between each tapered roller 4 and the inner diameter surface 52 a of the column portion 52 of the cage 5 and the outer diameter surface of the inner ring 2 is opposed to the inner surface 25 a of the large collar portion 25.
[0016]
A lubricating oil guide groove 55 that guides the lubricating oil 61 toward the inner surface 25 a of the large collar portion 25 is formed on the inner diameter surface 52 a of the column portion 52 in the cage 5. The lubricating oil guide groove 55 is formed in a groove shape having a substantially inverted U-shaped radial cross section, and the two opposing wall portions 55a and 55b and the radial cross section connecting these wall portions 55a and 55b are semicircular. The bottom portion 55c of the.
[0017]
In the lubricating oil guide groove 55, the opening on the small diameter end side of the inner ring 2 becomes the inlet 56 of the lubricating oil 61, and the opening on the large diameter end side of the inner ring 2 becomes the outlet 57 of the lubricating oil 61. The outlet 57 is disposed opposite to the inner surface 25a of the large collar portion 25, and the bottom portion 55c of the lubricating oil guide groove 55 is positioned on the inner diameter side of the outer diameter surface of the large collar portion 25. Yes. The lubricating oil guide groove 55 is shaped so that its cross section becomes narrower from the inlet 56 toward the outlet 57.
[0018]
Lubricating oil 61 guided to the outlet 57 of the lubricating oil guide groove 55 on the inner diameter side of one end in the axial direction of the column part 52 is passed from the inner surface 25a of the large collar part 25 of the inner ring 2 to the large collar part 25. An annular guide path 59 is provided to guide the outer diameter side of the guide.
[0019]
In the tapered roller bearing 1 having the above-described configuration, the column portion 52 of the cage 5 is thickened in the radial direction over substantially the entire circumferential direction thereof, so that the inner surface 52a of the column portion 52 and the outer ring 2 are outside. Since the lubricating oil flow path 6 between the radial surfaces is narrowed, the amount of the lubricating oil 61 is not increased, and accordingly, the stirring resistance of the lubricating oil 61 during operation of the bearing is reduced, resulting in high rotation. The operation of the tapered roller bearing 1 can be made smooth, for example, the rotational torque in the region is reduced. Further, since the inner diameter surface 52a of the column portion 52 of the cage 5 is positioned on the inner diameter side from the outer diameter surface 25b of the large collar portion 25 of the inner ring 2, the lubricating oil 61 is as shown by a two-dot chain line in the figure. Even if the rotating centrifugal force accompanying the operation of the bearing is applied, the sliding contact portion is easily reached. Therefore, sufficient lubrication for the sliding contact portion can be achieved.
[0020]
Further, since the lubricating oil guide groove 55 is provided in the inner diameter surface 52a of the column portion 52 of the cage 5, the lubricating oil 61 flows through the lubricating oil guide groove 55 as shown by a three-dot chain line in the figure. It becomes. Therefore, it becomes easier to supply the lubricating oil 61 to the sliding contact portion, and lubrication of the sliding contact portion is further improved.
[0021]
Further, the lubricating oil 61 guided from the outlet 57 of the lubricating oil guide groove 55 to the inner diameter side of one end in the axial direction of the pillar portion 52 of the cage 5 is greatly increased from the inner surface 25a of the large collar portion 25 of the inner ring 2. A guide path 59 is provided for guiding to the outer diameter side of the flange portion 25. Therefore, as shown by the two-dot chain line and the three-dot chain line in the figure, the lubricating oil 61 flows to the outside of the large collar 25 by flowing through the guide path 59 as indicated by the broken line in the figure. Smooth guide to the radial side.
[0022]
Further, since the lubricating oil guide groove 55 has a smaller cross-sectional area from the inlet 56 to the outlet 57, the lubricating oil 61 flowing from the inlet 56 is guided to the outlet 57 having a smaller area than the inlet 56. The flow of 61 becomes laminar.
[0023]
As described above, in the tapered roller bearing 1 according to the embodiment of the present invention, the sliding resistance of the tapered roller bearing 1 is suppressed while suppressing the stirring resistance of the lubricating oil 61 accompanying the rotational operation of the tapered roller bearing 1 and suppressing the rotational torque low. The lubricating oil 61 can be sufficiently supplied to the contact portion.
[0024]
【The invention's effect】
As described above, according to the present invention, the lubricating oil with respect to the sliding contact portion of the tapered roller bearing is suppressed while suppressing the stirring resistance of the lubricating oil accompanying the rotational operation of the tapered roller bearing to keep the rotational torque low. Can be supplied sufficiently.
[Brief description of the drawings]
1 is an overall cross-sectional view of a tapered roller bearing according to an embodiment of the present invention. FIG. 2 is a partially broken perspective view of a cage in the tapered roller bearing of FIG. 1. FIG. AA sectional view cut perpendicularly to the cross-section [FIG. 4] FIG.
DESCRIPTION OF SYMBOLS 1 Tapered roller bearing 2 Inner ring 3 Outer ring 4 Tapered roller 5 Cage 6 Lubricating oil flow path 25 Large flange part 25a Sliding contact surface 25b Outer diameter surface 52 Column part 52a Inner diameter surface 55 Lubricating oil guide groove 57 Outlet 59 Guide path 61 Lubricating oil

Claims (1)

内輪と外輪との間に複数の円錐ころが保持器により保持された状態で介装され、当該軸受の動作時に前記内輪の軸方向一方の大鍔部内面に前記円錐ころの軸方向一方の大径側端面がすべり接触し、前記内・外輪間の環状空間において、前記各円錐ころおよび前記保持器により仕切られてできる空間が潤滑油流路とされる円錐ころ軸受であって、
前記保持器は、樹脂を素材にして作られており、かつ、周方向に複数の柱部で仕切られて前記複数の円錐ころをそれぞれ保持する複数のポケットを有し、その柱部がその周方向のほぼ全体にわたって径方向に厚肉にされていることにより当該柱部の内径面と前記内輪の外径面との間の前記潤滑油流路が狭くされているとともに、その内径面が前記内輪の大鍔部の外径面よりも内径側に位置付けられて前記潤滑油流路が前記内輪の大鍔部内面に対向させられており、かつ、前記保持器の柱部の内径面には軸方向一方に向けて断面が狭くなる潤滑油案内溝が当該軸方向に沿って設けられており、
前記柱部の軸方向一方の端部内径側に、前記潤滑油案内溝の出口へ案内されてきた潤滑油を、前記内輪の大鍔部内面から大鍔部外径側へと案内する案内路が設けられている、ことを特徴とする円錐ころ軸受。A plurality of tapered rollers are interposed between the inner ring and the outer ring in a state of being held by a cage, and when the bearing is operated, one large axial portion of the tapered roller is placed on the inner surface of one large axial portion of the inner ring. A tapered roller bearing in which a radial end surface is in sliding contact, and a space formed by the tapered rollers and the cage in the annular space between the inner and outer rings is a lubricating oil flow path,
The cage is made of resin, and has a plurality of pockets that are partitioned by a plurality of column portions in the circumferential direction to hold the plurality of tapered rollers, respectively. together with the lubricating oil flow path between the outer diameter surface of the inner ring and the inner surface of the pillar portion by being in thick in the radial direction over substantially the entire direction is narrow, its inner diameter surface Positioned on the inner diameter side of the outer diameter surface of the large collar portion of the inner ring, the lubricating oil passage is opposed to the inner surface of the large collar portion of the inner ring, and on the inner diameter surface of the pillar portion of the cage Is provided with a lubricating oil guide groove along the axial direction, the cross section of which narrows toward one side in the axial direction.
A guide path for guiding the lubricating oil guided to the outlet of the lubricating oil guide groove from the inner surface of the large collar portion of the inner ring to the outer diameter side of the large collar portion on the inner diameter side of one end in the axial direction of the column portion. A tapered roller bearing characterized in that is provided.
JP2002246767A 2002-08-27 2002-08-27 Tapered roller bearings Expired - Fee Related JP4103501B2 (en)

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