JP2004197920A - Ball bearing - Google Patents

Ball bearing Download PDF

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Publication number
JP2004197920A
JP2004197920A JP2002370524A JP2002370524A JP2004197920A JP 2004197920 A JP2004197920 A JP 2004197920A JP 2002370524 A JP2002370524 A JP 2002370524A JP 2002370524 A JP2002370524 A JP 2002370524A JP 2004197920 A JP2004197920 A JP 2004197920A
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JP
Japan
Prior art keywords
outer ring
inner ring
ring
ball bearing
bent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002370524A
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Japanese (ja)
Inventor
Shoichi Maehara
祥一 前原
Takashi Iwata
孝 岩田
Takashi Okumura
剛史 奥村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP2002370524A priority Critical patent/JP2004197920A/en
Publication of JP2004197920A publication Critical patent/JP2004197920A/en
Pending legal-status Critical Current

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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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/767—Sealings of ball or roller bearings integral with the race
    • 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
    • F16C33/588—Races of sheet metal
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7893—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a cage or integral therewith
    • 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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball bearing securing the sufficient dust-proof property without impairing the effect of low cost caused by the increase of the number of components, and hardly disassembled after an inner ring, an outer ring and balls are assembled. <P>SOLUTION: This ball bearing comprises the outer ring 11 and the inner ring 12 manufactured by pressing a steel plate, and the plurality of balls 13 mounted between the outer ring 11 and the inner ring 12. The outer ring 11 has a raceway part 11a, a cylindrical part 11b and a bent part 11c extended inward in the radial direction. The inner ring 12 has a raceway part 12a, and a radially extended part 12b adjacent to an inner peripheral edge of the bent part 11c of the outer ring 11. An engagement part (projecting part 12c) for not separating the outer ring 11 and the inner ring 12 is formed on an extended part connected with at least one of the bent part 11c of the outer ring 11 and the radially extended part 12b of the inner ring 12. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車のステアリングコラム、スタータなどに用いられる玉軸受に関する。
【０００２】
【従来の技術】
従来から、自動車のステアリングコラムやスタータなどには、軸受として、例えばアンギュラ玉軸受、深溝玉軸受といった玉軸受が用いられている。ところが、ステアリングコラムは、自動車の走行中、常に大きな荷重を受けるものではなく、またスタータは自動車のエンジン始動時のみに短時間（概ね１秒程度）高速回転するものであり、耐久性などの要求特性が高くないので、一般の玉軸受では過剰品質となる。そのため、軌道輪として、冷間圧延鋼板等をプレス加工したものを用い、高品質ではないが安価である玉軸受の開発が進められている。
【０００３】
例えば、安価でありながら所定の使用条件を実現するのに充分な性能を持つ、玉の軌道用の球面部とその両側に各々連設された大径円筒部及び小径円筒部とを有する外輪と、上記外輪の球面部に対向する玉の軌道用の球面部とその両側に各々連設された大径円筒部及び小径円筒部とを有する内輪と、内輪の小径円筒部の端部に折り曲げ形成され且つ外輪の小径円筒部の端部に近接するフランジ状の第１密閉部と、外輪の大径円筒部の内周面に圧入され且つ内輪の大径円筒部に近接する円環状の第２密封部とを具備するアンギュラ玉軸受が提案されている（特許文献１参照）。
【０００４】
【特許文献１】
特開平７−２４８０１８号公報（請求項１、第１図）
【０００５】
【発明が解決しようとする課題】
ところが、安価化を目的とした玉軸受では、上記したアンギュラ玉軸受のように部品点数が多いものが多く、充分に安価化を実現しているとはいえない。また、品質をある程度犠牲にしているとはいえ、ステアリングコラムやスタータなどに用いられる玉軸受には、良好な防塵性が要求される。さらに、上記したアンギュラ玉軸受は、ステアリングコラムやスタータなどに組み付ける前に内輪、外輪、玉などの構成部品がばらばらになって紛失してしまったり、また組み付け時に分離しないよう細心の注意を払ったりしなければならないなど取り扱い性に問題があった。
【０００６】
本発明はこのような事情に鑑みなされたものであり、部品点数の増加などにより安価効果を損なうことなく充分な防塵性を確保し、しかも内輪、外輪、玉などを組み付けたのちは分離しにくい玉軸受の提供をその目的とする。
【０００７】
【課題を解決するための手段】
本発明の玉軸受は、鋼板をプレス加工して得られる外輪および内輪と、前記外輪および内輪の間に転動自在に配置される複数の玉とを備えた玉軸受であって、前記外輪が、所定曲率半径を有する軌道部と、その軌道部に連なり軸方向に延設される円筒部と、その円筒部に連なり径方向内方に延設される折曲部とを有し、前記内輪が、前記外輪の軌道部と対向し所定曲率半径を有する軌道部と、その軌道部に連なり前記外輪の折曲部の内周端に近接するよう延設される径方向延設部とを有し、前記外輪の折曲部および前記内輪の径方向延設部のうちの少なくとも一方に延設される部分に、外輪と内輪とを非分離とするための係合部を設けたことを特徴としている（請求項１）。
上記の構成によれば、外輪や内輪が鋼板をプレス加工して得られるものであり、また密封性を高める等のための別個の部品を用いていないので、安価な玉軸受となる。しかも、外輪と内輪とを非分離とするための係合部を備えているので、内輪、外輪、玉等の構成部品を組み立てた後は、これら構成部品がばらばらになって紛失してしまう等の不具合がなくなる。また、外輪の折曲部と内輪の径方向延設部とが近接しているので、狭い隙間によるラビリンス効果が得られ、外部から異物が混入するのを抑制することができる。また、外輪の折曲部が径方向内方に延設され、しかもその折曲部の内周端に近接するよう内輪の径方向延設部が形成されているので、コンパクトな玉軸受となり、そのためこの玉軸受を用いる各種機器の省スペース化に寄与できるという利点がある。
ここで、本発明において「係合部」とは、玉軸受の構成部品が分離しないように係合できる部分をいう。
【０００８】
上記の玉軸受において、前記係合部が前記内輪の径方向延設部に連なり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接するよう延設される突起部である場合には（請求項２）、この突起部を外輪の折曲部に係合可能にすれば、各構成部品がばらばらになる等の不具合が確実になくなる。
また、上記の玉軸受において、前記係合部が内輪の径方向延設部を二等配で径方向外方に変形させてなり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接する膨出部である場合には（請求項３）、この膨出部を外輪の折曲部に係合可能にすれば、各構成部品がばらばらになる等の不具合が確実になくなる。
【０００９】
【発明の実施の形態】
つぎに、本発明の実施形態について図面を参照しながら説明する。
図１は本発明の玉軸受の一実施形態に係るアンギュラ玉軸受を模式的に示す平面図であり、図２はそのＸ−Ｘ断面図である。また、図３は図１に示すアンギュラ玉軸受の内輪１２を９０°回転させた状態を示す平面図であり、図４はそのＹ−Ｙ断面図である。
このアンギュラ玉軸受は、外輪１１と、内輪１２と、両者の間に転動自在に配置される複数の玉１３と、複数の玉１３を保持するための冠形の保持器１４とから構成される。
【００１０】
外輪１１は、所定曲率半径を有する軌道部１１ａと、その軌道部１１ａに連なり軸方向に延設される円筒部１１ｂと、その円筒部１１ｂに連なり径方向内方に延設される折曲部１１ｃとを有する。折曲部１１ｃは、折り曲げやすいように、軌道部１１ａや円筒部１１ｂよりも若干薄肉になっている。また、折曲部１１ｃには、それぞれ同一形状の切り欠き部１１ｄが二等配（等間隔で対向した状態）で設けられており、内輪１２の突起部１２ｃを通過させることができるようになっている。
このような外輪１１は、例えば、縁部を薄肉にした冷間圧延鋼板などの鋼板を深絞り加工して所定曲率半径となるよう軌道部１１ａを形成した後、底を打ち抜き、さらに上記の薄肉の縁部を折り曲げて折曲部１１ｃを形成するとともに、所定の位置に切り欠き部１１ｄを形成し、その後、浸炭焼入れ、高周波焼入れなどを含む熱処理を行うことにより製造することができる。また、軌道部１１ａの軌道面には、熱処理後にバリ取り、スケール取りのためにバレル加工による仕上げ処理が施されている。
【００１１】
内輪１２は、前記外輪１１の軌道部１１ａと対向し所定曲率半径を有する軌道部１２ａと、その軌道部１２ａに連なり前記外輪１１の折曲部１１ｃの内周端に近接するよう延設される径方向延設部１２ｂとを有する。また、径方向延設部１２ｂには、前記外輪１１の折曲部１１ｃの内周端よりも内側に端面が位置し、互いに同一形状の前記突出部１２ｃが二等配（等間隔で対向した状態）でそれぞれ径方向外方に延びて設けられており、この突出部１２ｃは前記外輪１１の折曲部１１ｃに係合可能となっている。さらに、内輪１２は、前記軌道部１２ａに連なり軸方向に延設される円筒部１２ｄを有し、円筒部１２ｄの一部は、保持器１４と接触せず、しかもラビリンス効果が得られるよう、若干薄肉になっている。
このような内輪１２は、例えば、冷間圧延鋼板などの鋼板を深絞り加工して所定曲率半径となるよう軌道部１１ａを形成した後、底を打ち抜き、所定の位置に突起部１２ｃを形成し、その後、浸炭焼入れ、高周波焼入れなどを含む熱処理を行うことにより製造することができる。また、軌道部１２ａの軌道面には、熱処理後にバリ取り、スケール取りのためにバレル加工による仕上げ処理が施されている。
【００１２】
本形態に係るアンギュラ玉軸受は、係合部としての突出部１２ｃが設けられているので、例えば、図３および図４に示すように、内輪１２の突出部１２ｃと外輪１１の切り欠き部１１ｄとが９０°ずれるように回転させ、内輪１２の突出部１２ｃが外輪１１の折曲部１１ｃに係合可能にすれば、外輪１１、内輪１２、玉１３、保持器１４がばらばらになって紛失してしまうなどの不具合がなくなる。
また、外輪１１および内輪１２を深絞り加工で製造するとともに、非分離にするための別個の部品を用いず部品点数を増加させていないので、安価な製品となる。さらに、内輪１２の径方向延設部１２ｂと外輪１１の折曲部１１ｃとが近接しているので、狭い隙間によるラビリンス効果により、外部から異物が混入するのを抑制することができる。また、内輪１２と外輪１１とを係合するための突出部１２ｃが外輪１１の折曲部１１ｃよりも玉１３に近い位置（外輪１１の内側）に一体的に形成されているので、コンパクトなアンギュラ玉軸受となっており、そのためこのアンギュラ玉軸受を用いた各種機器の省スペース化にも寄与できるという利点がある。
【００１３】
なお、上記の実施形態において、内輪１２の突起部１２ｃを２つ設けた場合について説明したが、これに限定するものではなく、３つ以上設けても差し支えない。また、複数の突起部１２ｃの形状は全て同一形状である必要がないのも勿論である。
また、外輪１１の切り欠き部１１ｄを２つ設けた場合について説明したが、これに限定するものでなく、３つ以上設けても差し支えない。ただし、防塵性を高めることを考慮すれば切り欠き部１１ｄは少ない方が好ましい。また、複数の切り欠き部１１ｄの形状は、内輪の突起部１２ｃを通過させることが可能であれば特に制限はない。
また、本発明は、上記の態様に限定されるものではなく、例えば、外輪１１に切り欠き部１１ｄを形成しない態様であってもよい。この態様であれば、切り欠き部１１ｄから異物が混入することがないので、防塵性がより高いものとなる。
なお、この態様の場合は、図５に示すように、外輪１１の左右方向から荷重をかけて外輪１１を楕円形状にし、その状態のまま、内輪１２の突起部１２ｃを外輪１１の折曲部１１ｃより内側に挿入し（同図（ａ）参照）、その後荷重を解除して外輪１１を元の形状に戻すことにより組み立てることができる（同図（ｂ）参照）。
また、保持器１４を用いない総玉軸受としてもよい。
【００１４】
図６は本発明のアンギュラ玉軸受の他の実施形態を模式的に示す平面図であり、図７はそのＺ−Ｚ断面図である。このアンギュラ玉軸受は、前記した実施形態に係るアンギュラ玉軸受（図１参照）と比べ、外輪１１の切り欠き部１１ｄを形成せず、係合部として、内輪１２の径方向延設部１２ｂを二等配で径方向外方に変形させてなり、かつ前記外輪１１の折曲部１１ｃの内周端よりも外輪１１の円筒部１１ｂに近接するよう延設される膨出部１２ｅを形成した点で異なる。本態様に係るアンギュラ玉軸受は、外輪１１の左右方向から荷重をかけて外輪１１を楕円形状にし、その状態のまま、内輪１２の膨出部１２ｅを外輪１１の折曲部１１ｃより内側に挿入し、その後荷重を解除して外輪１１を元の形状に戻すことにより組み立てることができる。
【００１５】
本形態に係るアンギュラ玉軸受によれば、内輪１２の膨出部１２ｅが外輪１１の折曲部１１ｃに係合可能であるので、各構成部品がばらばらになるといったことがない。また、外輪１１および内輪１２を深絞り加工で製造するとともに、非分離にするための別個の部品を用いず部品点数を増加させていないので、安価な製品となる。さらに、内輪１２の径方向延設部１２ｂと外輪１１の折曲部１１ｃとが近接しているので、狭い隙間によるラビリンス効果により、外部から異物が混入するのを抑制することができる。また、内輪１２と外輪１１とを係合するための膨出部１２ｅが外輪１１の折曲部１１ｃよりも玉１３に近い位置（外輪１１の内側）に一体的に形成されているので、コンパクトなアンギュラ玉軸受となっており、そのためこのアンギュラ玉軸受を用いた各種機器の省スペース化にも寄与できるという利点がある。
【００１６】
なお、図６に示す実施形態では、外輪１１に切り欠き部を形成しない場合について説明したが、本発明はこれに限定するものではなく、内輪１２の膨出部１２ｅを通過させることが可能な切り欠き部を形成してもよい。この場合には、外輪１１の左右方向から荷重をかけて組み立てを行う必要がなくなるという利点を有する。
【００１７】
上記した各実施形態では内輪１２側に係合部を設けた場合について説明したが、本発明はこれに限定するものではなく、例えば、外輪１１の折曲部１１ｃの径方向内方に突起部を設けて内輪１２の径方向延設部１２ｂに係合可能にし外輪１１と内輪１２が非分離となるようにしてもよい。この場合、内輪１２を組み付けやすいように内輪１２の径方向延設部１２ｂに上記外輪１１の突起部を通過させるための切り欠き部を設けてもよいのは勿論である。また、外輪１１および内輪１２の両方に係合部を設けても差し支えない。
本発明の玉軸受は、例えば、自動車のステアリングコラム、スタータといった、耐久面などに関し高度な性能が要求されない部位の軸受として好適に用いられる。
【００１８】
【発明の効果】
以上のように、請求項１記載の玉軸受によれば、外輪や内輪が鋼板をプレス加工して得られるものであり、また部品点数が少ないので、安価な玉軸受となる。
しかも、外輪と内輪とを非分離とするための係合部を設けたので、各構成部品がばらばらになる等の不具合がなくなる。また、外輪の折曲部と内輪の径方向延設部とが近接しているので、防塵性が高いものとなる。
【００１９】
上記の玉軸受において、前記係合部が前記内輪の径方向延設部に連なり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接するよう延設される複数の突起部である場合（請求項２）、あるいは前記係合部が内輪の径方向延設部を二等配で径方向外方に変形させてなり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接する膨出部である場合（請求項３）には、突起部または膨出部を外輪の折曲部に係合可能にすれば、各構成部品がばらばらになる等の不具合が確実になくなる。
【図面の簡単な説明】
【図１】本発明の玉軸受の一実施形態であるアンギュラ玉軸受を模式的に示す平面図である。
【図２】図１のＸ−Ｘ矢視断面図である。
【図３】図１に示すアンギュラ玉軸受の内輪を９０°回転させた状態を示す平面図である。
【図４】図３のＹ−Ｙ矢視断面図である。
【図５】外輪に切り欠き部を形成しない場合の組み立て方法を説明するための模式的な平面図である。
【図６】本発明の玉軸受の一実施形態であるアンギュラ玉軸受を模式的に示す平面図である。
【図７】図６のＸ−Ｘ矢視断面図である。
【符号の説明】
１１ 外輪
１１ａ 外輪の軌道部
１１ｂ 外輪の円筒部
１１ｃ 外輪の折曲部
１２ 内輪
１２ａ 内輪の軌道部
１２ｂ 内輪の径方向延設部
１２ｃ 内輪の突起部（係合部）
１３ 玉
１４ 保持器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ball bearing used for a steering column, a starter, and the like of an automobile.
[0002]
[Prior art]
Conventionally, ball bearings such as angular ball bearings and deep groove ball bearings have been used as bearings in steering columns and starters of automobiles. However, the steering column does not always receive a large load while the vehicle is running, and the starter rotates at a high speed for a short time (approximately 1 second) only when starting the engine of the vehicle. Since the characteristics are not high, general ball bearings have excessive quality. For this reason, the use of a cold-rolled steel plate or the like pressed as a bearing ring has been progressing the development of a ball bearing which is not high quality but inexpensive.
[0003]
For example, an outer ring having a spherical portion for a ball orbit and a large-diameter cylindrical portion and a small-diameter cylindrical portion continuously provided on both sides of the spherical portion for a ball orbit having sufficient performance to realize predetermined use conditions while being inexpensive. An inner ring having a spherical portion for orbit of a ball opposed to the spherical portion of the outer ring and a large-diameter cylindrical portion and a small-diameter cylindrical portion respectively provided on both sides thereof; and a bend formed at an end of the small-diameter cylindrical portion of the inner ring. A flange-shaped first sealing portion which is provided near the end of the small-diameter cylindrical portion of the outer ring, and a second annular portion which is press-fitted into the inner peripheral surface of the large-diameter cylindrical portion of the outer ring and is close to the large-diameter cylindrical portion of the inner ring. An angular ball bearing having a sealing portion has been proposed (see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-7-248018 (Claim 1, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, many ball bearings for the purpose of cost reduction have a large number of parts, such as the above-mentioned angular ball bearings, and it cannot be said that the cost reduction is sufficiently realized. Further, although the quality is sacrificed to some extent, ball bearings used for steering columns, starters, and the like are required to have good dustproofness. In addition, the above-mentioned angular contact ball bearings require that the components such as the inner ring, outer ring, and balls fall apart and be lost before they are mounted on a steering column or starter, or that they must be carefully secured so that they do not separate during mounting. There was a problem in handling, such as having to do it.
[0006]
The present invention has been made in view of such circumstances, and secures sufficient dustproofness without impairing the cost-effectiveness due to an increase in the number of parts and the like, and it is difficult to separate after assembling the inner ring, the outer ring, the ball, and the like. Its purpose is to provide ball bearings.
[0007]
[Means for Solving the Problems]
The ball bearing of the present invention is a ball bearing provided with an outer ring and an inner ring obtained by pressing a steel plate, and a plurality of balls that are rotatably arranged between the outer ring and the inner ring. A track portion having a predetermined radius of curvature, a cylindrical portion connected to the track portion and extending in the axial direction, and a bent portion connected to the cylindrical portion and extended radially inward, the inner ring Has a track portion facing the track portion of the outer ring and having a predetermined radius of curvature, and a radially extending portion connected to the track portion and extending near the inner peripheral end of the bent portion of the outer ring. An engaging portion is provided at a portion extending to at least one of the bent portion of the outer ring and the radially extending portion of the inner ring to make the outer ring and the inner ring non-separable. (Claim 1).
According to the above configuration, the outer ring and the inner ring are obtained by pressing a steel plate, and no separate parts are used for improving the sealing performance, so that the ball bearing is inexpensive. In addition, since the outer ring and the inner ring are provided with engaging portions for non-separation, after assembling the inner ring, the outer ring, the balls, and other components, these components are separated and lost. The problem of is eliminated. Further, since the bent portion of the outer ring and the radially extending portion of the inner ring are close to each other, a labyrinth effect due to a narrow gap can be obtained, and entry of foreign matter from the outside can be suppressed. Also, since the bent portion of the outer ring extends radially inward, and furthermore, the radially extending portion of the inner ring is formed so as to be close to the inner peripheral end of the bent portion, it becomes a compact ball bearing, Therefore, there is an advantage that it is possible to contribute to space saving of various devices using the ball bearing.
Here, in the present invention, the “engaging portion” refers to a portion that can be engaged without separating the components of the ball bearing.
[0008]
In the above-described ball bearing, the engagement portion is connected to a radially extending portion of the inner ring, and is a protrusion that extends closer to a cylindrical portion of the outer ring than an inner peripheral end of a bent portion of the outer ring. In some cases (claim 2), if this projection can be engaged with the bent portion of the outer race, problems such as the individual components being separated can be reliably eliminated.
Further, in the above ball bearing, the engaging portion deforms the radially extending portion of the inner ring radially outward in two equal parts, and the outer ring is more bent than the inner peripheral end of the bent portion of the outer ring. In the case of the bulging portion close to the cylindrical portion (Claim 3), if the bulging portion can be engaged with the bent portion of the outer ring, the troubles such as the individual components becoming separated will surely occur. Disappears.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view schematically showing an angular ball bearing according to an embodiment of the ball bearing of the present invention, and FIG. 2 is a sectional view taken along line XX. FIG. 3 is a plan view showing a state in which the inner ring 12 of the angular contact ball bearing shown in FIG. 1 is rotated by 90 °, and FIG. 4 is a sectional view taken along line YY.
The angular ball bearing includes an outer ring 11, an inner ring 12, a plurality of balls 13 arranged to be able to roll between the two, and a crown-shaped retainer 14 for holding the plurality of balls 13. You.
[0010]
The outer race 11 has a track portion 11a having a predetermined radius of curvature, a cylindrical portion 11b connected to the track portion 11a and extending in the axial direction, and a bent portion connected to the cylindrical portion 11b and extending radially inward. 11c. The bent portion 11c is slightly thinner than the track portion 11a and the cylindrical portion 11b so as to be easily bent. Further, the bent portions 11c are provided with notches 11d of the same shape in an evenly distributed manner (a state in which the notches 11d face each other at equal intervals), so that the protrusions 12c of the inner ring 12 can be passed through. ing.
Such an outer race 11 is formed, for example, by deep drawing a steel plate such as a cold-rolled steel plate having a thinner edge to form a raceway portion 11a so as to have a predetermined radius of curvature, and then punching out a bottom, and further thinning the above-described thin wall. The bent portion 11c is formed by bending the edge of the notch, the notch 11d is formed at a predetermined position, and then heat treatment including carburizing and quenching is performed. The raceway surface of the raceway portion 11a is subjected to a finishing process by barrel processing for deburring after heat treatment and scale removal.
[0011]
The inner race 12 is opposed to the race 11a of the outer race 11 and has a predetermined radius of curvature, and extends so as to be continuous with the race 12a and to be close to the inner peripheral end of the bent part 11c of the outer race 11. A radially extending portion 12b. In the radially extending portion 12b, an end face is located inside the inner peripheral end of the bent portion 11c of the outer race 11, and the projecting portions 12c having the same shape are equally distributed (equally opposed to each other). In this state, the protruding portion 12c is engageable with the bent portion 11c of the outer race 11. Further, the inner race 12 has a cylindrical portion 12d which is connected to the track portion 12a and extends in the axial direction. A part of the cylindrical portion 12d does not contact the retainer 14, and a labyrinth effect is obtained. It is slightly thinner.
For example, such an inner ring 12 forms a track portion 11a so as to have a predetermined radius of curvature by deep drawing a steel plate such as a cold-rolled steel plate, and then punches a bottom to form a protrusion 12c at a predetermined position. Thereafter, it can be manufactured by performing a heat treatment including carburizing and quenching, induction hardening and the like. The raceway surface of the raceway portion 12a is subjected to a finishing process by barrel processing for deburring after heat treatment and scale removal.
[0012]
Since the angular contact ball bearing according to the present embodiment is provided with the protruding portion 12c as an engaging portion, for example, as shown in FIGS. 3 and 4, the protruding portion 12c of the inner ring 12 and the notch portion 11d of the outer ring 11 are provided. Are rotated so as to be shifted by 90 ° so that the protruding portion 12c of the inner ring 12 can be engaged with the bent portion 11c of the outer ring 11, the outer ring 11, the inner ring 12, the ball 13, and the retainer 14 are separated and lost. This eliminates problems such as accidents.
In addition, since the outer race 11 and the inner race 12 are manufactured by deep drawing and the number of components is not increased without using separate components for non-separation, the product is inexpensive. Further, since the radially extending portion 12b of the inner ring 12 and the bent portion 11c of the outer ring 11 are close to each other, it is possible to suppress the entry of foreign matter from the outside by the labyrinth effect due to the narrow gap. In addition, since the protruding portion 12c for engaging the inner ring 12 and the outer ring 11 is integrally formed at a position closer to the ball 13 (inside the outer ring 11) than the bent portion 11c of the outer ring 11, it is compact. This is an angular ball bearing, which has the advantage that it can contribute to space saving of various devices using the angular ball bearing.
[0013]
In the above embodiment, the case where two protrusions 12c of the inner ring 12 are provided has been described, but the present invention is not limited to this, and three or more protrusions may be provided. In addition, it is needless to say that the shapes of the plurality of protrusions 12c do not all need to be the same.
Further, the case where two notches 11d of the outer race 11 are provided has been described, but the present invention is not limited to this, and three or more notches may be provided. However, it is preferable that the number of the cutout portions 11d is small in consideration of improving dustproofness. The shape of the plurality of cutouts 11d is not particularly limited as long as the cutouts can pass through the protrusions 12c of the inner race.
Further, the present invention is not limited to the above-described embodiment. For example, an embodiment in which the notch 11d is not formed in the outer race 11 may be employed. According to this mode, foreign matter does not enter from the cutout portion 11d, so that the dustproofness is higher.
In this case, as shown in FIG. 5, a load is applied from the left and right directions of the outer ring 11 to make the outer ring 11 an elliptical shape. 11c, it can be assembled by releasing the load and returning the outer ring 11 to its original shape (see FIG. 7B).
Further, a full ball bearing without using the retainer 14 may be used.
[0014]
FIG. 6 is a plan view schematically showing another embodiment of the angular contact ball bearing of the present invention, and FIG. 7 is a ZZ sectional view thereof. This angular ball bearing does not form the cutout portion 11d of the outer ring 11 and uses the radially extending portion 12b of the inner ring 12 as an engagement portion as compared with the angular ball bearing according to the above-described embodiment (see FIG. 1). A bulging portion 12e is formed which is radially outwardly deformed in two equal parts and extends so as to be closer to the cylindrical portion 11b of the outer ring 11 than the inner peripheral end of the bent portion 11c of the outer ring 11. Different in that. In the angular ball bearing according to the present embodiment, the outer ring 11 is formed into an elliptical shape by applying a load from the left and right directions of the outer ring 11, and the bulged portion 12 e of the inner ring 12 is inserted inside the bent portion 11 c of the outer ring 11 in that state. Thereafter, the load can be released and the outer ring 11 can be assembled by returning to the original shape.
[0015]
According to the angular ball bearing according to the present embodiment, since the bulging portion 12e of the inner ring 12 can be engaged with the bent portion 11c of the outer ring 11, each component does not fall apart. In addition, since the outer race 11 and the inner race 12 are manufactured by deep drawing and the number of components is not increased without using separate components for non-separation, the product is inexpensive. Further, since the radially extending portion 12b of the inner ring 12 and the bent portion 11c of the outer ring 11 are close to each other, it is possible to suppress the entry of foreign matter from the outside by the labyrinth effect due to the narrow gap. In addition, since the bulging portion 12e for engaging the inner race 12 and the outer race 11 is integrally formed at a position closer to the ball 13 (inside the outer race 11) than the bent portion 11c of the outer race 11, it is compact. Therefore, there is an advantage that it can contribute to space saving of various devices using the angular ball bearing.
[0016]
In the embodiment shown in FIG. 6, a case where the notch is not formed in the outer ring 11 has been described. However, the present invention is not limited to this, and it is possible to pass through the bulging portion 12 e of the inner ring 12. A notch may be formed. In this case, there is an advantage that it is not necessary to perform the assembly by applying a load from the left and right directions of the outer race 11.
[0017]
In each of the above-described embodiments, the case where the engagement portion is provided on the inner ring 12 side has been described. However, the present invention is not limited to this. For example, a protrusion may be provided radially inward of the bent portion 11c of the outer ring 11. May be provided so as to be able to engage with the radially extending portion 12b of the inner ring 12 so that the outer ring 11 and the inner ring 12 are not separated. In this case, it is a matter of course that a notch portion for allowing the protrusion of the outer ring 11 to pass therethrough may be provided in the radially extending portion 12b of the inner ring 12 so that the inner ring 12 can be easily assembled. Further, both the outer ring 11 and the inner ring 12 may be provided with the engaging portions.
INDUSTRIAL APPLICABILITY The ball bearing of the present invention is suitably used, for example, as a bearing for a part that does not require a high level of performance such as a durable surface, such as an automobile steering column and starter.
[0018]
【The invention's effect】
As described above, according to the ball bearing of the first aspect, the outer ring and the inner ring are obtained by pressing a steel plate, and the number of parts is small, so that the ball bearing is inexpensive.
In addition, since the outer ring and the inner ring are provided with an engaging portion for non-separation, there is no problem that each component is separated. Further, since the bent portion of the outer ring and the radially extending portion of the inner ring are close to each other, the dust resistance is high.
[0019]
In the above-described ball bearing, a plurality of protrusions are provided such that the engagement portion is connected to a radially extending portion of the inner ring and is closer to a cylindrical portion of the outer ring than to an inner peripheral end of a bent portion of the outer ring. Or the engaging portion is formed by equally deforming the radially extending portion of the inner ring radially outward, and the engaging portion is formed from the inner peripheral end of the bent portion of the outer ring. In the case where the protruding portion or the protruding portion is engageable with the bent portion of the outer ring, the respective components are separated from each other. The defect of the above is surely eliminated.
[Brief description of the drawings]
FIG. 1 is a plan view schematically showing an angular ball bearing which is one embodiment of a ball bearing of the present invention.
FIG. 2 is a sectional view taken along line XX of FIG.
FIG. 3 is a plan view showing a state where the inner ring of the angular contact ball bearing shown in FIG. 1 is rotated by 90 °.
FIG. 4 is a sectional view taken along the line YY of FIG. 3;
FIG. 5 is a schematic plan view for explaining an assembling method when a notch is not formed in the outer ring.
FIG. 6 is a plan view schematically showing an angular ball bearing which is an embodiment of the ball bearing of the present invention.
FIG. 7 is a sectional view taken along the line XX of FIG. 6;
[Explanation of symbols]
Reference Signs List 11 outer ring 11a outer ring raceway portion 11b outer ring cylindrical portion 11c outer ring bent portion 12 inner ring 12a inner ring raceway portion 12b inner ring radially extending portion 12c inner ring protrusion (engagement portion)
13 Ball 14 Cage

Claims (3)

鋼板をプレス加工して得られる外輪および内輪と、前記外輪および内輪の間に転動自在に配置される複数の玉とを備えた玉軸受であって、
前記外輪が、所定曲率半径を有する軌道部と、その軌道部に連なり軸方向に延設される円筒部と、その円筒部に連なり径方向内方に延設される折曲部とを有し、
前記内輪が、前記外輪の軌道部と対向し所定曲率半径を有する軌道部と、その軌道部に連なり前記外輪の折曲部の内周端に近接するよう延設される径方向延設部とを有し、
前記外輪の折曲部および前記内輪の径方向延設部のうちの少なくとも一方に延設される部分に、外輪と内輪とを非分離とするための係合部を設けたことを特徴とする玉軸受。A ball bearing comprising an outer ring and an inner ring obtained by pressing a steel plate, and a plurality of balls arranged to be able to roll between the outer ring and the inner ring,
The outer race has a track portion having a predetermined radius of curvature, a cylindrical portion connected to the track portion and extending in the axial direction, and a bent portion connected to the cylindrical portion and extending radially inward. ,
A track portion having a predetermined radius of curvature facing the track portion of the outer ring, and a radially extending portion connected to the track portion and extending near the inner peripheral end of the bent portion of the outer ring; Has,
At least one of the bent portion of the outer ring and the radially extending portion of the inner ring is provided with an engagement portion for separating the outer ring and the inner ring from each other. Ball bearings. 前記係合部が、前記内輪の径方向延設部に連なり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接するよう延設される突起部である請求項１記載の玉軸受。2. The projection, wherein the engaging portion is connected to a radially extending portion of the inner ring and extends closer to a cylindrical portion of the outer ring than an inner peripheral end of a bent portion of the outer ring. 3. Ball bearings. 前記係合部が、前記内輪の径方向延設部を二等配で径方向外方に変形させてなり、かつ前記外輪の折曲部の内周端よりも外輪の円筒部に近接するよう延設される膨出部である請求項１記載の玉軸受。The engaging portion is formed by radially outwardly deforming the radially extending portion of the inner ring in two equal parts, and is closer to the cylindrical portion of the outer ring than the inner peripheral end of the bent portion of the outer ring. The ball bearing according to claim 1, wherein the ball bearing is an extended bulge.
JP2002370524A 2002-12-20 2002-12-20 Ball bearing Pending JP2004197920A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021162129A (en) * 2020-04-02 2021-10-11 株式会社ジェイテクト Thrust bearing, and assembly method for thrust bearing
WO2022219868A1 (en) 2021-04-13 2022-10-20 日本精工株式会社 Angular ball bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021162129A (en) * 2020-04-02 2021-10-11 株式会社ジェイテクト Thrust bearing, and assembly method for thrust bearing
WO2022219868A1 (en) 2021-04-13 2022-10-20 日本精工株式会社 Angular ball bearing
KR20230170033A (en) 2021-04-13 2023-12-18 닛본 세이고 가부시끼가이샤 angular ball bearings

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