JP4026292B2 - Tapered roller bearing - Google Patents

Tapered roller bearing Download PDF

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Publication number
JP4026292B2
JP4026292B2 JP2000014756A JP2000014756A JP4026292B2 JP 4026292 B2 JP4026292 B2 JP 4026292B2 JP 2000014756 A JP2000014756 A JP 2000014756A JP 2000014756 A JP2000014756 A JP 2000014756A JP 4026292 B2 JP4026292 B2 JP 4026292B2
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cage
inner ring
diameter
peripheral surface
small
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JP2001208054A (en
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義雄 正田
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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
    • 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
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/06—Placing rolling bodies in cages or bearings
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii

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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)

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車の変速機やデファレンシャルギヤ等の軸受として用いられる円すいころ軸受に関する。
【０００２】
【従来の技術】
従来の円すいころ軸受の組み立て工程は、まず、図５（ａ）に示すように、円すい状にプレス成形されて小径側にフランジａを有する保持器ｂのポケットｃに、転動面が円すい形状をなすころｄを該保持器ｂの内周側から挿入し、これにより、保持器ｂところｄとを一体にしてアッセンブリー状態にする。
【０００３】
次いで、保持器ｂの大径側に内輪ｅの小径部を対向配置し、この状態で、内輪ｅを保持器ｂところｄのアッセンブリーに軸方向に挿入する（図５（ｂ）参照 ）。内輪ｅは、外周面に円すい状の軌道面ｆを有し、且つ、該軌道面ｆの小径側の端部に小鍔ｇを有すると共に大径側の端部に大鍔ｈを有している。また、内輪ｅの小鍔ｇの外周円筒部は、内輪ｅを保持器ｂところｄのアッセンブリーに挿入する際に、ころｄの小径側端部を貫通できるような寸法関係になっている。したがって、内輪ｅを保持器ｂところｄのアッセンブリーに挿入した状態のままでは、ころｄと保持器ｂが分解してしまう虞れがある。
【０００４】
そこで、内輪ｅを保持器ｂところｄのアッセンブリーに挿入した後、図５（ｃ）に示すように、保持器ｂのフランジａ側の端部全周を図の二点鎖線から実線の状態になるように加締めて変形させ、ころの外周方向への遊びを少なくし、これにより、内輪ｅ、保持器ｂ及びころｄを分解不能な構造にしている。
そして、この構造に内周面に円すい状の軌道面を有する外輪（図示せず。）を組み込むことにより、円すいころ軸受が構成される。
【０００５】
なお、保持器ｂのフランジａ側の端部を加締めた後にころｄが拘束されて転動不能とならないようにすべく、加締め後のころｄのラジアル方向の遊びが適切な値を持つように保持器ｂの変形量を制御しながら加締めを行う。このように内輪ｅ、保持器ｂ及びころｄを分解不能な構造にするのは、円すいころ軸受は通常外輪単体と内輪ｅ、保持器ｂ及びころのアッセンブリーをそれぞれ別々に装置に組み込むことが多く、その時に内輪ｅ、保持器ｂ、及びころｄのアッセンブリーが分解しないようになっていないと取り扱いが不便になるためである。
【０００６】
【発明が解決しようとする課題】
従来の円すいころ軸受の構造においては、内輪ｅを保持器ｂところｄのアッセンブリーに挿入した後に、保持器ｂのフランジａ側の端部全周を加締める工程が必要となるため、組立コストが高くつくばかりか、組み立てが面倒であるという不都合がある。
【０００７】
本発明はかかる不都合を解消するためになされたものであり、保持器の加締め工程を省略して組立コストの低減を図ることができると共に、組み立ての容易化を図ることができる円すいころ軸受を提供することを目的とする。
【０００８】
【課題を解決するための手段】
かかる目的を達成するために、本発明に係る円すいころ軸受は、内周面に円すい状の軌道面を有する外輪と、外周面に円すい状の軌道面を有し、且つ、該軌道面の小径側の端部に小鍔を有すると共に大径側の端部に大鍔を有する内輪と、内輪の軌道面と外輪の軌道面との間に介在され、転動面が円すい形状をなす複数のころと、前記外輪および前記内輪の円周方向に複数のポケットを有する保持器とを備え、前記ころが前記保持器の外径方向に離脱しないように前記ポケット内に収容された円すいころ軸受において、前記内輪の小鍔の軌道面側外周面と端面側外周面の外径形状を、前記ころの大径側端面を前記保持器のポケットに押しつけたときの前記ころの小径側の内接円径Ｄ e より大きい長径を有すると共に前記内接円径Ｄ e より小さい短径を有し且つ位相が円周方向に９０度ずれた楕円形状としたことを特徴とする。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を図を参照して説明する。図１は本発明の第１の実施の形態である円すいころ軸受の外輪を省略した説明的断面図、図２は図１の矢印Ａ方向から見た図で保持器のみを破断した図、図３は内輪を挿入するときに保持器ところのアッセンブリーを支持する治具を説明するための説明的断面図、図４は本発明の第２の実施の形態である円すいころ軸受の外輪を省略した説明的断面図である。
【００１０】
まず、図１〜図３を参照して、第１の実施の形態の円すいころ軸受から説明すると、この円すいころ軸受は、内周面に円すい状の軌道面を有する外輪（図示せず。）と、外周面に円すい状の軌道面１を有し、且つ、該軌道面１の小径側の端部に小鍔２を有すると共に大径側の端部に大鍔３を有する内輪４と、内輪４の軌道面１と外輪の軌道面との間に介在され、転動面が円すい形状をなす複数のころ５と、内輪４にころ５を組み込んだ状態でころ５が外周方向に離脱しないようにころ５を保持する保持器６とを備える。
【００１１】
保持器６は、例えば円すい状にプレス成形されて小径側にフランジ７を有するものを用い、高剛性と高強度の仕様としている。保持器６の外周面にはポケット８がころ５の数に対応して周方向に略等間隔で複数形成されており、保持器６の内周側からポケット８にころ５を挿入した際に、ころ５が外周方向に抜けないようになっている。なお、保持器６の各断面は真円を狙っており、各ポケット８も均一幅を狙って製作している。
【００１２】
内輪４の小鍔２の外周面は軌道面１から離間する側に縮径するテーパ形状で、且つ、外周断面形状が楕円形をなしている。この実施の形態では、図２において小鍔２の外周楕円の長径が上下方向、短径が左右方向になっており、小鍔２の軌道面１側外周面の楕円と端面側外周面の楕円は同位相となっている。また、小鍔２の軌道面１側外周面の楕円の長径部はころ５と干渉し、短径部はころ５と干渉しないようになっており、一方、小鍔２の端面側外周面の楕円は長径部及び短径部のいずれもころ５に干渉しないようになっている。
【００１３】
ここで、この実施の形態では、小鍔２の端面側外接円径（楕円の長径）をＤ1、小鍔２の軌道面１側外接円径（楕円の長径）をＤ2、ころ５の大径側端面を保持器６のポケット８に押しつけた時のころ５の小径側の内接円径をＤeとしたときにＤ1＜Ｄe＜Ｄ2の寸法関係になるようにしている。
かかる構成の円すいころ軸受を組み立てるには、まず、保持器６のポケット８にころ５を該保持器６の内周側から挿入し、保持器６ところ５とを一体にしてアッセンブリー状態にする。
【００１４】
次いで、図３に示すように、保持器６ところ５のアッセンブリーを支持する治具１０によってころ５のポケット８から突出する部分の小径側端面を軸方向に支持すると共に、保持器６の大径側に内輪４の小鍔２側端部を対向配置し、この状態で、内輪４を保持器６ところ５のアッセンブリーに軸方向に挿入する。ここで、上述したように、Ｄ1 ＜Ｄe の寸法関係になっているので、内輪４を保持器６ところ５のアッセンブリーに挿入する時に、該内輪４の小鍔２側端部がスムースに挿入できる。
【００１５】
次いで、この状態から内輪４に対して軸方向に挿入荷重を負荷すると、小鍔２の楕円長径部の外周面と当たっているころ５が外径側に押され、そのころ５の位置における保持器６が外径側に弾性変形することにより内輪４の挿入を許容する。かかる挿入時においては、保持器６の一部、即ち、保持器６の内輪４の小鍔２の楕円長径部の位置に対応する部分をころ５を介して膨らませるように弾性変形させているので、ころを介して保持器の全周が外径側に膨らんでいる状態で組み立てる従来構造に比べて、保持器６の変形に要する荷重を非常に小さなものとすることができる。また、保持器６ところ５のアッセンブリーを支持する治具１０によって、ころ５のポケット８から突出する部分の小径側端面を軸方向に支持しているので、保持器６に軸方向の荷重が負荷されて該保持器６が永久変形してしまうのを防止することができる。
【００１６】
次いで、内輪４をさらに軸方向に押して小鍔２の全長がころ５の小径側端部の内接を貫通すると、保持器６が弾性復帰する。この時、上述したように、Ｄe ＜Ｄ2 の寸法関係にしているので、保持器６ところ５のアッセンブリーが内輪４から離脱することはない。そして、この構造に内周面に円すい状の軌道面を有する外輪（図示せず。）を組み込むことにより、円すいころ軸受が構成される。
【００１７】
上記の説明から明らかなように、この実施の形態では、内輪４の小鍔２の外周断面形状を非円形としているので、保持器６ところ５のアッセンブリーに内輪４を挿入する際に、ころ５を介して保持器６の円周上の一部のみを外径側に弾性変形させれば足り、この結果、組み立ての容易化を図ることができる。
また、内輪４を保持器６ところ５のアッセンブリーに挿入した後に、保持器６が弾性復帰して保持器６ところ５のアッセンブリーが内輪４から離脱しない構造としているので、従来のような保持器６のフランジ７側端部の加締めを不要にすることができ、組立てコストを低くすることができる。
【００１８】
更に、保持器６のフランジ７側端部の加締めを不要にすることができることから、加締め不良によるころばれやころの拘束による焼付き事故等のトラブルをなくすことができ、信頼性が向上する。
更に、従来構造のように内輪の小鍔の外周断面が真円形状の場合には保持器全周を外径側に膨らませないと内輪を挿入できないので少ない変形量でも保持器に働く応力が大きくなり、挿入時に発生する応力を一定の値以下にするため締め代の許容範囲は非常に狭いものとなるが、この実施の形態では、保持器６を局部的に外径側に変形させればよいので、楕円長径との締め代の許容範囲を広くすることができ、各部の製作許容差が広がって加工が容易である。また、保持器を変形させるのに要する荷重も小さくなるので、挿入時のころと小鍔との接触面圧も低くなり、ころが小鍔上を滑りながら移動してもころに傷が付くことはない。
【００１９】
次に、図４を参照して、本発明の第２の実施の形態である円すいころ軸受について説明する。なお、この実施の形態は、第１の実施の形態に対して、保持器の形状及び内輪の小鍔の形状のみが相違しており、従って、第１の実施の形態と重複する部分については図に同一符号を付してその説明を省略する。
この実施の形態では、保持器６０の剛性を低くして内輪４の挿入が容易になるように小径側にフランジのないものを用いている。なお、保持器の強度と剛性が必要な用途に用いる場合は、第１の実施の形態に示したフランジ付き保持器を用いることも可能である。
【００２０】
内輪４の小鍔２０の外周面は軸方向の各断面で同じ楕円形状となっているが、小鍔２０の軌道面１側外周面の楕円と端面側外周面の楕円は位相が異なって軸方向にねじれの関係にある。この実施の形態では、小鍔２０の軌道面１側外周面の楕円と端面側外周面の楕円とは互いに９０°位相がずれており、具体的には図４において端面側外周面の楕円の長径が上下方向で短径は紙面と直交する方向であり、軌道面１側外周面の楕円の長径は紙面と直交する方向で短径は上下方向である。また、端面側外周面の楕円の長径及び軌道面１側外周面の楕円の長径は共にころ５の大径側端面を保持器６０のポケット８に押しつけた時のころ５の小径側の内接円径Ｄeより大きく設定されてころ５と干渉し、一方、端面側外周面の楕円の短径と平均径及び軌道面１側外周面の楕円の短径と平均径は共に、Ｄｅより小さく設定されてころ５と干渉しないようになっている。
【００２１】
このようにこの実施の形態では、小鍔２０の端面側外周面及び軌道面１側外周面の各楕円の長径がＤe より大きく、短径と平均径がＤe よりも小さくなっているので、内輪４を保持器６０ところ５のアッセンブリーに挿入する際に、端面側外周面及び軌道面１側外周面の各楕円の長径部に位置するころ５を介して局部的に保持器６０に外径側に弾性変形させることにより、内輪４の挿入が可能で組み立てを容易に行うことができ、しかも、内輪４の挿入後においては、保持器６０が弾性復帰して保持器６０ところ５のアッセンブリーが内輪４から離脱することはない。特に、この実施の形態では、内輪４の小鍔２０の外周楕円形状が軸方向にねじれているので、保持器を径方向に変形させながらねじり力を与えない限り、保持器６０ところ５のアッセンブリーが内輪４から離脱することはなく、離脱防止機能は第１の実施の形態より優れたものとなる。その他の作用効果は第１の実施の形態と同一であるので省略する。
【００２２】
なお、上記各実施の形態では、内輪の小鍔の外周断面形状を楕円形にした場合を例に採ったが、楕円以外にもいろいろな形状が考えられる。例えば数本のころのピッチを除いて円周上にころピッチで小さな切り欠きを設ける構造なども考えられる。楕円形以外の非円形を採用しても良いのは勿論である。
また、上記の各実施の形態では、鋼製のプレス保持器を用いた例を示したが、樹脂製の保持器の場合にも同じように本発明を適用できることはいうまでもない。
【００２３】
【発明の効果】
上記の説明から明らかなように、本発明によれば、保持器の加締め工程を省略して組立コストの低減を図ることができると共に、組み立ての容易化を図ることができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態である円すいころ軸受の外輪を省略した説明的断面図である。
【図２】図１の矢印Ａ方向から見た図で保持器のみを破断した図である。
【図３】内輪を挿入する時に保持器ところのアッセンブリーを支持する治具を説明するための説明的断面図である。
【図４】本発明の第２の実施の形態である円すいころ軸受の外輪を省略した説明的断面図である。
【図５】従来の円すいころ軸受の組み立て工程を説明するための説明的断面図であり、（ａ）は保持器のポケットにころを挿入した状態を示す図、（ｂ）は内輪を保持器ところのアッセンブリーに挿入した状態を示す図、（ｃ）は保持器のフランジ側の端部全周を加締めて変形させた状態を示す図である。
【符号の説明】
１…軌道面
２，２０…小鍔
３…大鍔
４…内輪
５…ころ
６，６０…保持器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tapered roller bearing used as a bearing for a transmission, a differential gear, or the like of an automobile.
[0002]
[Prior art]
As shown in FIG. 5 (a), the conventional process of assembling a tapered roller bearing is as follows. First, a rolling surface is tapered in a pocket c of a cage b that is press-formed into a conical shape and has a flange a on the small diameter side. Is inserted from the inner peripheral side of the retainer b, thereby bringing the retainer b and d together into an assembled state.
[0003]
Next, the small-diameter portion of the inner ring e is opposed to the large-diameter side of the cage b, and in this state, the inner ring e is inserted in the assembly of the cage b and d in the axial direction (see FIG. 5B). The inner ring e has a conical raceway surface f on the outer peripheral surface, and has a small flange g at the end on the small diameter side of the track surface f and a large flange h at the end on the large diameter side. Yes. Further, the outer cylindrical portion of the small collar g of the inner ring e has a dimensional relationship so that the inner ring e can pass through the small-diameter side end of the roller d when the inner ring e is inserted into the assembly of the retainer b or d. Therefore, if the inner ring e is inserted in the assembly of the retainer b and d, the rollers d and the retainer b may be disassembled.
[0004]
Therefore, after the inner ring e is inserted into the assembly of the cage b and d, the entire circumference of the end of the cage b on the flange a side is changed from the two-dot chain line to the state of the solid line as shown in FIG. The inner ring e, the retainer b, and the roller d are made in a structure that cannot be disassembled.
And a tapered roller bearing is comprised by incorporating the outer ring | wheel (not shown) which has a conical track surface in an internal peripheral surface in this structure.
[0005]
In addition, the radial play of the roller d after crimping has an appropriate value so that the roller d is not restrained and cannot be rolled after the end of the cage b on the flange a side is crimped. Thus, caulking is performed while controlling the deformation amount of the cage b. In this way, the inner ring e, the cage b and the roller d are structured so as not to be disassembled. In the tapered roller bearing, the outer ring alone and the assembly of the inner ring e, the cage b and the roller are often separately incorporated in the device. If the assembly of the inner ring e, the retainer b, and the roller d is not disassembled at that time, the handling becomes inconvenient.
[0006]
[Problems to be solved by the invention]
In the conventional tapered roller bearing structure, after inserting the inner ring e into the assembly of the cage b and d, the process of crimping the entire circumference of the end of the cage b on the flange a side is required, so the assembly cost is low. Not only is it expensive, but it has the inconvenience of being cumbersome to assemble.
[0007]
The present invention has been made in order to eliminate such inconvenience, and a tapered roller bearing which can reduce the assembly cost by omitting the caulking process of the cage and can facilitate the assembly. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve this object, a tapered roller bearing according to the present invention has an outer ring having a conical raceway surface on the inner peripheral surface, a conical raceway surface on the outer peripheral surface, and a small diameter of the raceway surface. A plurality of inner rings having a small flange at the end on the side and a large flange at the end on the large diameter side, and a raceway surface between the inner ring raceway surface and the outer ring raceway surface. In a tapered roller bearing comprising a roller and a cage having a plurality of pockets in a circumferential direction of the outer ring and the inner ring, and the roller is accommodated in the pocket so as not to be detached in an outer diameter direction of the cage , the inscribed circle of the small-diameter side of the roller when the outer diameter shape of the small rib of the raceway surface side outer peripheral surface and the end face outer peripheral surface of the inner ring, and pressing the large diameter side end face of the rollers in the pockets of the cage the inscribed circle diameter D e is smaller than a short and has a diameter D e is larger than the major diameter An elliptical shape having a diameter and a phase shifted by 90 degrees in the circumferential direction is characterized.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory cross-sectional view in which the outer ring of the tapered roller bearing according to the first embodiment of the present invention is omitted, and FIG. 2 is a view seen from the direction of arrow A in FIG. 3 is an explanatory cross-sectional view for explaining a jig for supporting the assembly of the cage when the inner ring is inserted, and FIG. 4 omits the outer ring of the tapered roller bearing according to the second embodiment of the present invention. It is explanatory sectional drawing.
[0010]
First, the tapered roller bearing according to the first embodiment will be described with reference to FIGS. 1 to 3. This tapered roller bearing has an outer ring (not shown) having a tapered raceway surface on the inner peripheral surface. And an inner ring 4 having a conical raceway surface 1 on the outer peripheral surface, and having a small flange 2 at the end of the small diameter side of the track surface 1 and a large flange 3 at the end of the large diameter side, A plurality of rollers 5 which are interposed between the raceway surface 1 of the inner ring 4 and the raceway surface of the outer ring and whose rolling surfaces are conical, and the rollers 5 are not separated in the outer circumferential direction when the rollers 5 are incorporated in the inner ring 4. And a cage 6 for holding the rollers 5.
[0011]
The retainer 6 is, for example, one that is press-formed in a conical shape and has a flange 7 on the small diameter side, and has high rigidity and high strength specifications. A plurality of pockets 8 are formed on the outer peripheral surface of the cage 6 at substantially equal intervals in the circumferential direction corresponding to the number of rollers 5. When the rollers 5 are inserted into the pocket 8 from the inner peripheral side of the cage 6. The rollers 5 are prevented from coming off in the outer circumferential direction. Each cross section of the cage 6 is aimed at a perfect circle, and each pocket 8 is also produced aiming at a uniform width.
[0012]
The outer peripheral surface of the gavel 2 of the inner ring 4 has a tapered shape that is reduced in diameter toward the side away from the raceway surface 1, and the outer peripheral cross-sectional shape is an ellipse. In this embodiment, the major axis of the outer periphery ellipse of the gavel 2 is in the vertical direction and the minor axis is in the left-right direction in FIG. Are in phase. In addition, the major axis of the ellipse on the outer circumferential surface of the gavel 2 on the raceway surface 1 side interferes with the roller 5, and the minor axis part does not interfere with the roller 5. The ellipse is configured such that neither the long diameter portion nor the short diameter portion interferes with the roller 5.
[0013]
Here, in this embodiment, D 1 the end surface circumscribed circle diameter (major axis of the ellipse) of the small rib 2, (ellipse major axis) raceway surface 1 side circumscribed circle diameter of the small flange 2 to D 2, rollers 5 It is set to be in the dimensional relationship of D 1 <D e <D 2 when the inscribed circle diameter of the small diameter side of the roller 5 when pressing the large diameter side end face to the pocket 8 of the cage 6 was D e .
In order to assemble the tapered roller bearing having such a configuration, first, the roller 5 is inserted into the pocket 8 of the cage 6 from the inner peripheral side of the cage 6, and the cage 6 and 5 are integrated into an assembled state.
[0014]
Next, as shown in FIG. 3, the small diameter side end surface of the portion protruding from the pocket 8 of the roller 5 is supported in the axial direction by the jig 10 that supports the assembly of the cage 6, and the large diameter of the cage 6. The small ring 2 side end of the inner ring 4 is opposed to the side, and in this state, the inner ring 4 is inserted into the assembly of the cage 6 and 5 in the axial direction. Here, as described above, since the dimensional relationship of D 1 <D e is satisfied, when the inner ring 4 is inserted into the assembly of the retainer 6 or 5, the end of the inner ring 4 on the side of the gavel 2 is smooth. Can be inserted.
[0015]
Next, when an insertion load is applied in the axial direction to the inner ring 4 from this state, the roller 5 that is in contact with the outer peripheral surface of the elliptical long diameter portion of the gavel 2 is pushed to the outer diameter side, and the roller 5 is held at the position. The container 6 is elastically deformed to the outer diameter side, thereby allowing the inner ring 4 to be inserted. At the time of such insertion, a part of the cage 6, that is, a portion corresponding to the position of the elliptical long diameter portion of the small collar 2 of the inner ring 4 of the cage 6 is elastically deformed so as to swell through the rollers 5. Therefore, the load required for the deformation of the cage 6 can be made very small as compared with the conventional structure assembled in a state where the entire circumference of the cage swells to the outer diameter side via the rollers. Further, since the small diameter side end surface of the portion protruding from the pocket 8 of the roller 5 is supported in the axial direction by the jig 10 that supports the assembly of the cage 6, the axial load is applied to the cage 6. Thus, the cage 6 can be prevented from being permanently deformed.
[0016]
Next, when the inner ring 4 is further pushed in the axial direction and the entire length of the small flange 2 passes through the inscribed portion of the small diameter side end portion of the roller 5, the cage 6 is elastically restored. At this time, as described above, since the dimensional relationship of D e <D 2 is satisfied, the assembly of the cage 6 and 5 does not separate from the inner ring 4. And a tapered roller bearing is comprised by incorporating the outer ring | wheel (not shown) which has a conical track surface in an internal peripheral surface in this structure.
[0017]
As is apparent from the above description, in this embodiment, the outer cross-sectional shape of the gavel 2 of the inner ring 4 is non-circular, so that when the inner ring 4 is inserted into the assembly of the cage 6, the roller 5 It is sufficient that only a part of the circumference of the cage 6 is elastically deformed to the outer diameter side via the boss, and as a result, assembly can be facilitated.
Further, since the cage 6 is elastically restored after the inner ring 4 is inserted into the assembly of the cage 6 and 5, the assembly of the cage 6 and 5 does not separate from the inner ring 4. It is possible to eliminate the need for caulking the flange 7 side end portion, and to reduce the assembly cost.
[0018]
Furthermore, since the caulking of the flange 7 side end portion of the cage 6 can be made unnecessary, troubles such as roll-up caused by poor caulking and seizure accidents due to roller restraint can be eliminated, and reliability is improved. To do.
Furthermore, when the outer ring cross-section of the inner ring is round like the conventional structure, the inner ring cannot be inserted unless the entire circumference of the cage is inflated to the outer diameter side, so the stress acting on the cage is large even with a small amount of deformation. Therefore, the allowable range of the tightening allowance is very narrow in order to keep the stress generated at the time of insertion below a certain value, but in this embodiment, if the cage 6 is locally deformed to the outer diameter side, Since it is good, the tolerance | permissible_range of an allowance with an ellipse major axis can be widened, the manufacturing tolerance of each part spreads, and a process is easy. Also, since the load required to deform the cage is reduced, the contact surface pressure between the roller and the gavel during insertion is also reduced, and the roller is damaged even if the roller moves while sliding on the gavel. There is no.
[0019]
Next, with reference to FIG. 4, the tapered roller bearing which is the 2nd Embodiment of this invention is demonstrated. Note that this embodiment differs from the first embodiment only in the shape of the cage and the shape of the gavel of the inner ring, and therefore, for the parts that overlap with the first embodiment. The same reference numerals are given to the drawings and the description thereof is omitted.
In this embodiment, the one having no flange on the small diameter side is used so that the rigidity of the cage 60 is lowered and the inner ring 4 can be easily inserted. In addition, when using for the use for which the intensity | strength and rigidity of a cage are required, it is also possible to use the cage with a flange shown in 1st Embodiment.
[0020]
Although the outer peripheral surface of the gavel 20 of the inner ring 4 has the same elliptical shape in each cross section in the axial direction, the ellipse of the outer peripheral surface of the raceway 1 side and the ellipse of the outer peripheral surface of the end surface have different phases. It is twisted in the direction. In this embodiment, the ellipse on the raceway 1 side outer peripheral surface of the gavel 20 and the ellipse on the end surface outer peripheral surface are out of phase with each other by 90 °. Specifically, in FIG. The major axis is the vertical direction and the minor axis is the direction perpendicular to the paper surface. The major axis of the ellipse on the outer circumferential surface on the track surface 1 side is the direction perpendicular to the paper surface, and the minor axis is the vertical direction. Further, both the major axis of the ellipse on the outer peripheral surface of the end surface and the major axis of the ellipse on the outer peripheral surface of the raceway surface 1 are inscribed on the smaller diameter side of the roller 5 when the large end surface of the roller 5 is pressed against the pocket 8 of the cage 60. interfere with rollers 5 is larger than the circle diameter D e, while the average diameter of the minor axis of the ellipse minor axis of the ellipse of the end face-side outer peripheral surface and the average diameter and the track surface 1 side outer peripheral surface are both smaller than De It is set so as not to interfere with the roller 5.
[0021]
In this way, this embodiment, larger than the ellipse major axis D e of the end face-side outer peripheral surface and the raceway surface 1 side outer peripheral surface of the small rib 20, the average diameter and short diameter is smaller than D e When the inner ring 4 is inserted into the assembly of the cage 60 and 5, the inner ring 4 is locally attached to the cage 60 via the rollers 5 positioned on the major axis of each ellipse of the outer circumferential surface on the end surface side and the outer circumferential surface on the raceway surface 1 side. By elastically deforming the inner ring 4, the inner ring 4 can be inserted and assembled easily, and after the inner ring 4 is inserted, the retainer 60 is elastically restored and the assembly of the retainer 60 and 5 is assembled. Never leaves the inner ring 4. In particular, in this embodiment, since the outer peripheral elliptical shape of the gavel 20 of the inner ring 4 is twisted in the axial direction, the assembly of the cage 60 and 5 is required unless a twisting force is applied while deforming the cage in the radial direction. Does not disengage from the inner ring 4, and the disengagement prevention function is superior to that of the first embodiment. Other functions and effects are the same as those of the first embodiment, and are omitted.
[0022]
In each of the above embodiments, the case where the outer peripheral cross-sectional shape of the gavel of the inner ring is an ellipse is taken as an example, but various shapes other than the ellipse are conceivable. For example, a structure in which a small notch with a roller pitch is provided on the circumference except for the pitch of several rollers may be considered. Of course, non-circular shapes other than elliptical shapes may be employed.
Moreover, in each said embodiment, although the example using the steel press holder was shown, it cannot be overemphasized that this invention is applicable similarly also in the case of a resin-made holder.
[0023]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to reduce the assembly cost by omitting the caulking process of the cage, and to obtain the effect that the assembly can be facilitated. .
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view in which an outer ring of a tapered roller bearing according to a first embodiment of the present invention is omitted.
FIG. 2 is a view in which only the cage is broken in the view seen from the direction of arrow A in FIG.
FIG. 3 is an explanatory cross-sectional view for explaining a jig for supporting an assembly of a cage when an inner ring is inserted.
FIG. 4 is an explanatory sectional view in which an outer ring of a tapered roller bearing according to a second embodiment of the present invention is omitted.
FIGS. 5A and 5B are explanatory sectional views for explaining an assembly process of a conventional tapered roller bearing, wherein FIG. 5A shows a state in which rollers are inserted into pockets of the cage, and FIG. The figure which shows the state inserted in the assembly, (c) is a figure which shows the state which crimped and deform | transformed the edge part periphery by the side of the flange of a holder | retainer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Track surface 2, 20 ... Small cage 3 ... Large cage 4 ... Inner ring 5 ... Roller 6, 60 ... Cage

Claims (1)

内周面に円すい状の軌道面を有する外輪と、外周面に円すい状の軌道面を有し、且つ、該軌道面の小径側の端部に小鍔を有すると共に大径側の端部に大鍔を有する内輪と、内輪の軌道面と外輪の軌道面との間に介在され、転動面が円すい形状をなす複数のころと、前記外輪および前記内輪の円周方向に複数のポケットを有する保持器とを備え、前記ころが前記保持器の外径方向に離脱しないように前記ポケット内に収容された円すいころ軸受において、
前記内輪の小鍔の軌道面側外周面と端面側外周面の外径形状を、前記ころの大径側端面を前記保持器のポケットに押しつけたときの前記ころの小径側の内接円径Ｄ e より大きい長径を有すると共に前記内接円径Ｄ e より小さい短径を有し且つ位相が円周方向に９０度ずれた楕円形状としたことを特徴とする円すいころ軸受。An outer ring having a conical raceway surface on the inner peripheral surface, a conical raceway surface on the outer peripheral surface, and a small edge at the end on the small diameter side of the raceway surface and at the end on the large diameter side An inner ring having a large collar, a plurality of rollers interposed between the raceway surface of the inner ring and the raceway surface of the outer ring, and a rolling surface having a conical shape, and a plurality of pockets in the circumferential direction of the outer ring and the inner ring A tapered roller bearing housed in the pocket so that the roller does not separate in the outer diameter direction of the cage ,
Inscribed circle diameter of the small diameter side of the roller when the outer diameter shape of the small rib of the raceway surface side outer peripheral surface and the end face outer peripheral surface of the inner ring, and pressing the large diameter side end face of the rollers in the pockets of the cage D tapered roller bearing, characterized in that the inscribed circle diameter D e smaller and phase have a minor diameter of an elliptical shape with 90 degrees in the circumferential direction together with the e larger major axis.
JP2000014756A 2000-01-24 2000-01-24 Tapered roller bearing Expired - Fee Related JP4026292B2 (en)

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Cited By (1)

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US9453534B2 (en) 2013-01-25 2016-09-27 Nsk Ltd. Tapered roller bearing

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JP2003139133A (en) * 2001-11-01 2003-05-14 Nsk Ltd Tapered roller bearing
EP1757823B2 (en) * 2005-08-25 2015-01-07 NTN Corporation Tapered roller bearing
JP4527635B2 (en) * 2005-08-25 2010-08-18 Ｎｔｎ株式会社 Tapered roller bearing
JP4754431B2 (en) * 2005-08-25 2011-08-24 Ｎｔｎ株式会社 Tapered roller bearing
JP4742753B2 (en) * 2005-08-30 2011-08-10 株式会社ジェイテクト Tapered roller bearing assembly equipment
JP5899759B2 (en) * 2011-09-29 2016-04-06 日本精工株式会社 Tapered roller bearing
JP6153761B2 (en) * 2013-04-17 2017-06-28 Ntn株式会社 Tapered roller bearing
JP6137348B2 (en) * 2016-01-19 2017-05-31 日本精工株式会社 Tapered roller bearing
JP2022044273A (en) * 2020-09-07 2022-03-17 Ntn株式会社 Conical roller bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9453534B2 (en) 2013-01-25 2016-09-27 Nsk Ltd. Tapered roller bearing

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