JP4072326B2 - Rolling bearing manufacturing method and rolling bearing - Google Patents

Rolling bearing manufacturing method and rolling bearing Download PDF

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Publication number
JP4072326B2
JP4072326B2 JP2001312649A JP2001312649A JP4072326B2 JP 4072326 B2 JP4072326 B2 JP 4072326B2 JP 2001312649 A JP2001312649 A JP 2001312649A JP 2001312649 A JP2001312649 A JP 2001312649A JP 4072326 B2 JP4072326 B2 JP 4072326B2
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outer ring
ring
rolling bearing
inner ring
annular recess
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JP2003120690A (en
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賢治 漆川
眞平 首藤
博美 川西
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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
    • 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
    • F16C33/64—Special methods of manufacture
    • 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
    • F16C19/18—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 two or more rows of balls
    • F16C19/181—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 two or more rows of balls with angular contact
    • F16C19/183—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 two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—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 two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—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 two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

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

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a rolling bearing enabling a reduction of material cost to reduce a cost of the rolling bearing. SOLUTION: With this method of manufacturing the rolling bearing, the material cost is reduced since a part 6 being an inner ring 12 is punched out of part of a material 1 including a part 5 being an outer ring 15 by forging to reduce the cost of a rolling bearing 21. Since the inner ring 12 and the outer ring 15 are composed of the same material of S55C, the inner ring 12 and the outer ring 15 can be set-forged out of the same material 1. By applying a special heat treatment to the inner ring 12 having a shorter service life than the outer ring 15 when formed of the same material of S55C, the fatigue life of the inner ring 12 is improved comparing to the outer ring 15.

Description

【０００１】
【発明の属する技術分野】
この発明は、たとえば、自動車などのハブユニットを構成する転がり軸受の製造方法および転がり軸受に関する。
【０００２】
【従来の技術】
従来、この種の転がり軸受の製造方法としては、図２(Ａ)〜図２(Ｅ)に順に示すような鍛造工程による方法がある。この製造方法では、転がり軸受の外輪を製造する。
【０００３】
まず、図２(Ａ)に示すＳ５５Ｃからなる長方形状の周面を有する鋼材料１０１を、図において上下方向から圧縮する据え込み工程により、横方向に広げ、図２(Ｂ)に示すように、横長形状の素材１０２にする。
【０００４】
次に、上記素材１０２を、型鍛造により成形して、図２(Ｃ)に示すように、全体として筒状で、内周側が軸方向の１箇所で円板状の節１０３で塞がれた筒材１０４にする。次に、図２(Ｄ)に示す底抜き工程によって、内バリとしての上記節１０３を打ち抜き、内周側で軸方向に貫通した穴１０５を有する円筒部材１０６を形成する。
【０００５】
次に、上記円筒部材１０６の軸方向の一端で外周側に略円形に延在している外バリ１０７を打ち抜いて、図２(Ｅ)に示すように、表面層を旋削する工程を残した外輪１０８を作製する。
【０００６】
【発明が解決しようとする課題】
ところで、上記従来の製造方法では、外輪１０８の製造時に、筒材１０４の内バリとなる節１０３を廃却しているが、この節１０３の体積は材料全体の体積に対して相当の割合を有するため、材料費の増大を招いている。
【０００７】
そこで、この発明の目的は、材料費を削減でき、転がり軸受のコストダウンを図れる転がり軸受の製造方法を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明の転がり軸受の製造方法は、内周に複列の軌道を有し外周にフランジ部が形成された外輪と、外周に各々１つの軌道を有する２つの内輪と、上記内輪と外輪との間に配置された複数の転動体からなると共にハブユニットを構成する転がり軸受を製造する方法であって、
上記外輪となる素材は、ＪＩＳ規格Ｓ４０Ｃ〜Ｓ５８Ｃ , ＳＡＥ規格１０４０〜１０９５に該当する炭素鋼で構成され、
上記外輪となる素材に、断面略Ｕ字形状に軸方向に窪んだ環状凹部を形成し、
上記環状凹部の底の内輪側部分の軸方向反対側の面を、外輪となる素材部分の内周面に連なる凹湾曲面とし、
上記２つの内輪のうちの一方の内輪となる素材は、
上記外輪となる素材の上記環状凹部の底から軸方向に打ち抜いて、上記外輪となる素材の一部から鍛造により打ち抜き製造し、
打ち抜き製造した上記内輪となる素材を、浸炭窒化処理することで、外輪よりも疲労寿命が向上した内輪とすることを特徴としている。
【０００９】
この請求項１の発明では、上記２つの内輪のうちの一方の内輪となる素材は、上記外輪となる素材の一部から鍛造により打ち抜き製造するから、材料費を削減でき、転がり軸受のコストダウンを図れる。
【００１０】
また、この請求項１の発明では、上記外輪となる素材に、断面略Ｕ字形状に軸方向に窪んだ環状凹部を形成することで、外輪および内輪の軌道面となる部分を同時に形成できるから、さらなるコストダウンを図れる。また、環状凹部の底を軸方向に打ち抜くことで、外輪となる素材から内輪となる素材を容易に切り離すことができる。また、外輪となる素材から内輪となる素材を打ち抜いて切り離したときのせん断面の寸法精度を良くすることができる。
【００１１】
また、この請求項１の発明では、上記内輪と外輪を、同じ材質としてＪＩＳ規格Ｓ４０Ｃ〜Ｓ５８Ｃ , ＳＡＥ規格１０４０〜１０９５に該当する炭素鋼で構成したことで、同一の素材から内輪と外輪とを形成するセット鍛造が可能となり、かつ、同一材料で形成した場合に外輪よりも短寿命となる内輪を特殊熱処理することによって、外輪に比べて内輪の疲労寿命を向上できる。したがって、この発明によれば、低コストで長寿命の転がり軸受を提供できる。
【００１２】
また、この請求項１の発明では、上記環状凹部の底の内輪側部分の軸方向反対側の面を、外輪となる素材部分の内周面に連なる凹湾曲面としたから、鍛造が容易であり、金型寿命を向上できる。また、外輪となる素材から打ち抜いて切り離した内輪となる素材の旋削取り代を安定に確保できる。
【００１３】
また、一実施形態の転がり軸受の製造方法では、上記断面略Ｕ字形状に軸方向に窪んだ環状凹部の内壁の外輪側軸方向寸法を、上記環状凹部の開口幅の１.７倍以下に形成する 。
【００１４】
この実施形態では、上記断面略Ｕ字形状に軸方向に窪んだ環状凹部の内壁の外輪側軸方向寸法を、上記環状凹部の開口幅の１.７倍以下に形成することにより、鍛造が容易になり、金型寿命を向上できる。なお、外輪側軸方向寸法が開口幅の１.７倍を上回ると鍛造し難くなる。
【００１５】
また、一実施形態の転がり軸受の製造方法では、上記凹湾曲面の曲率半径を、８ｍｍ以上とする。
【００１６】
この実施形態では、上記凹湾曲面の曲率半径を、８ｍｍ以上とすることにより、鍛造が容易になり、金型寿命を向上できる。また、外輪となる素材から打ち抜いて切り離した内輪となる素材の旋削取り代を安定に確保できる。なお、曲率半径が８ｍｍを下回ると鍛造し難くなる。
【００１７】
また、請求項１の発明の転がり軸受の製造方法では、上記転がり軸受は、ハブユニットを構成する。
【００１８】
この請求項１の発明の製造方法によれば、材料費を削減でき、低コストでもって、転がり軸受を含んだハブユニットを製造できる。
【００１９】
【発明の実施の形態】
以下、この発明を図示の実施の形態により詳細に説明する。
【００２０】
この実施形態の転がり軸受の製造方法は、ハブユニットを構成する転がり軸受の製造方法であり、前述した従来例と図２(Ａ),図２(Ｂ)に示す工程が共通であるので、従来例と異なる図２(Ｂ)以後の工程を説明する。
【００２１】
この実施形態では、図２(Ｂ)に示す外輪となる素材１０２を型鍛造により成形して、図１(Ａ)に示すように、全体として円筒形状の素材１に成形する。
【００２２】
この素材１は、内周面５Ａに、表皮層を旋削することによって軌道面となる湾曲面２および３を有し、外周にフランジとなる部分４を有する外輪となる部分５と、内輪となる部分６を有する。なお、図１(Ａ)の中心線より下半分では内輪となる部分６を切除した後の様子を示している。
【００２３】
この内輪となる部分６は、外輪となる部分５の内周面５Ａにつながっており、外周面６Ａは軌道面となる湾曲形状になっている。この湾曲形状の外周面６Ａは、上記外輪となる部分５の内周の湾曲面３に滑らかに連続していて、この湾曲面３と外周面６Ａとが断面略Ｕ字形状の軸方向に窪んだ環状凹部７を構成している。図１に示すように、この環状凹部７の内壁７Ａの外輪側軸方向寸法ｂを、環状凹部７の開口幅ａの１.７倍以下に設定した。
【００２４】
また、上記内輪となる部分６は、上記外周面６Ａと軸方向反対側の面が、外輪となる部分５の内周面５Ａに連なる凹湾曲面６Ｂになっている。この凹湾曲面６Ｂの曲率半径Ｒ１を８ｍｍ以上とした。
【００２５】
次に、図１(Ａ)に示す素材１を、上記環状凹部７の底から打ち抜いて、上記内輪となる部分６をせん断面Ｓ１に沿って軸方向に打ち抜く。さらに、この打ち抜いた内輪となる部分６から、上記凹湾曲面６Ｂとせん断面Ｓ１と端面延長面９とが囲む環状部分１１を切除し、図１(Ｂ)に示すように、表面層を旋削して内輪となる前の素材部分１９を得る。この旋削工程前の素材部分１９は、図示しない所定の表面層が旋削され、さらに、浸炭窒化処理の特殊熱処理を施されて、後述の内輪１２となる。
【００２６】
一方、素材１から内輪となる部分６を打ち抜いた残りの外輪となる部分５は、図示しない所定の表面層が旋削されて、例えば、図３に示すように、複列の軌道１３と１４を内周に有し、外周にフランジ１６を有する外輪１５となる。
【００２７】
図３は、ハブユニット２０を示し、複列アンギュラ玉軸受形式の転がり軸受２１を備える。このハブユニット２０は、回転軸部材２２と、この軸部材２２の軸部２２Ａに嵌合固定された内輪１２と、この内輪１２および回転軸部材２２の内輪をなす軌道部２２Ｂの径方向外方に対向配置された外輪１５を備える。上記外輪１５の軌道１３と軌道部２２Ｂとの間には周方向に所定間隔を隔てて複数の玉２３が配置され、外輪１５の軌道１４と内輪１２の軌道面２５との間にも周方向に所定間隔を隔てて複数の玉２４が配置される。
【００２８】
上記実施形態の転がり軸受の製造方法によれば、内輪１２となる部分６は、外輪１５となる部分５を含む素材１の一部から鍛造により打ち抜き製造するから、材料費を削減でき、転がり軸受２１のコストダウンを図れる。
【００２９】
また、この実施形態では、内輪１２と外輪１５を、同じ材質Ｓ５５Ｃで構成したことで、同一の素材１から内輪１２と外輪１５とを形成するセット鍛造が可能となり、かつ、同一材料Ｓ５５Ｃで形成した場合に外輪１５よりも短寿命となる内輪１２を上述の特殊熱処理することによって、外輪１５に比べて内輪１２の疲労寿命を向上できる。したがって、この実施形態によれば、低コストで長寿命の転がり軸受２１を提供できる。
【００３０】
また、この実施形態では、素材１に、断面略Ｕ字形状に軸方向に窪んだ環状凹部７を形成することで、外輪１５および内輪１２の軌道面となる湾曲面３および外周面６Ａを同時に形成できるから、さらなるコストダウンを図れる。また、環状凹部７の底から軸方向に打ち抜くことで、外輪１５となる素材１から内輪１２となる部分６を容易に切り離すことができる。また、外輪１５となる素材部分５から内輪１２となる素材部分６を打ち抜いて切り離したときのせん断面Ｓ１の寸法精度を良くすることができる。
【００３１】
また、この実施形態では、環状凹部７の底の内輪側部分の軸方向反対側の面を、外輪１５となる素材部分５の内周面５Ａに連なる凹湾曲面６Ｂとしたから、鍛造が容易であり、金型寿命を向上できる。また、素材１から打ち抜いて切り離した内輪１２となる素材６の旋削取り代を安定に確保できる。
【００３２】
また、この実施形態では、断面略Ｕ字形状に軸方向に窪んだ環状凹部７の内壁７Ａの外輪側軸方向寸法ｂを、環状凹部７の開口幅ａの１.７倍以下に形成することにより、鍛造が容易になり、金型寿命を向上できる。
【００３３】
また、この実施形態では、上記凹湾曲面６Ｂの曲率半径Ｒ１を、８ｍｍ以上とすることにより、鍛造が容易になり、金型寿命を向上できる。また、外輪１５となる素材１から打ち抜いて切り離した内輪１２となる素材６の旋削取り代を安定に確保できる。
【００３４】
また、この実施形態の製造方法によれば、材料費を削減でき、低コストでもって、転がり軸受２１を含んだハブユニット２０を製造できる。
【００３５】
尚、上記実施形態では、素材１の材質をＪＩＳ規格Ｓ５５Ｃとしたが、この他に、ＪＩＳ規格Ｓ４０Ｃ〜Ｓ５８Ｃ,ＳＡＥ規格１０４０〜１０９５等の炭素鋼を用いてもよい。
【００３６】
【発明の効果】
以上より明らかなように、請求項１の発明の転がり軸受の製造方法では、一方の内輪となる素材は、外輪となる素材の一部から鍛造により打ち抜き製造するから、材料費を削減でき、転がり軸受のコストダウンを図れる。また、この請求項１の発明では、上記外輪となる素材に、断面略Ｕ字形状に軸方向に窪んだ環状凹部を形成することで、外輪および内輪の軌道面となる部分を同時に形成できるから、さらなるコストダウンを図れる。また、環状凹部の底を軸方向に打ち抜くことで、外輪となる素材から内輪となる素材を容易に切り離すことができる。また、外輪となる素材から内輪となる素材を打ち抜いて切り離したときのせん断面の寸法精度を良くすることができる。
【００３７】
また、請求項１の発明では、上記内輪と外輪を、同じ材質として炭素鋼で構成したことで、同一の素材から内輪と外輪とを形成するセット鍛造が可能となり、かつ、同一材料で形成した場合に外輪よりも短寿命となる内輪を特殊熱処理することによって、外輪に比べて内輪の疲労寿命を向上できる。したがって、この発明によれば、低コストで長寿命の転がり軸受を提供できる。
【００３８】
また、請求項１の発明では、上記環状凹部の底の内輪側部分の軸方向反対側の面を、外輪となる素材部分の内周面に連なる凹湾曲面としたから、鍛造が容易であり、金型寿命を向上できる。また、外輪となる素材から打ち抜いて切り離した内輪となる素材の旋削取り代を安定に確保できる。
【００３９】
また、一実施形態では、上記断面略Ｕ字形状に軸方向に窪んだ環状凹部の内壁の外輪側軸方向寸法を、上記環状凹部の開口幅の１.７倍以下に形成することにより、鍛造が容易になり、金型寿命を向上できる。
【００４０】
また、一実施形態では、上記凹湾曲面の曲率半径を、８ｍｍ以上とすることにより、金型寿命を向上できる。また、外輪となる素材から内輪となる素材を打ち抜いて切り離したときのせん断面の寸法精度を良くすることができる。また、外輪となる素材から打ち抜いて切り離した内輪となる素材の旋削取り代を安定に確保できる。
【００４１】
また、請求項１の発明の製造方法によれば、材料費を削減でき、低コストでもって、転がり軸受を含んだハブユニットを製造できる。
【図面の簡単な説明】
【図１】 図１(Ａ)はこの発明の転がり軸受の製造方法の実施形態の主要な工程を説明するための断面図であり、図１(Ｂ)は素材１から打ち抜いた旋削工程前の内輪１２となる前の素材１９の断面図である。
【図２】 図２(Ａ)〜図２(Ｅ)は、従来の転がり軸受の製造方法の工程を順に示す図である。
【図３】 上記実施形態で製造する転がり軸受を備えるハブユニットの断面図である。
【符号の説明】
１…円筒形状の素材、２,３…湾曲面、４…フランジとなる部分、
５…外輪となる部分、５Ａ…内周面、６…内輪となる部分、６Ａ…外周面、
６Ｂ…凹湾曲面、７…環状凹部、７Ａ…内壁、ａ…開口幅、
ｂ…外輪側軸方向寸法、Ｓ１…せん断面、Ｒ１…曲率半径、９…端面延長面、
１１…環状部分、１２…内輪、１３,１４…軌道、１５…外輪、
１６…フランジ、２０…ハブユニット、２１…転がり軸受、２２…軸部材、
２２Ａ…軸部、２２Ｂ…軌道部、２３,２４…玉。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a rolling bearing that constitutes a hub unit such as an automobile, and a rolling bearing.
[0002]
[Prior art]
Conventionally, as a method for manufacturing this type of rolling bearing, there is a method using a forging process as shown in order in FIGS. 2 (A) to 2 (E). In this manufacturing method, an outer ring of a rolling bearing is manufactured.
[0003]
First, the steel material 101 having a rectangular peripheral surface made of S55C shown in FIG. 2 (A) is spread in the lateral direction by an upsetting process in which compression is performed in the vertical direction in the drawing, as shown in FIG. 2 (B). The horizontally long material 102 is used.
[0004]
Next, the material 102 is formed by die forging, and as shown in FIG. 2 (C), it is cylindrical as a whole, and the inner peripheral side is closed by a disk-shaped node 103 at one axial position. A cylindrical material 104 is used. Next, by the bottoming process shown in FIG. 2 (D), the node 103 as an inner burr is punched out to form a cylindrical member 106 having a hole 105 penetrating in the axial direction on the inner peripheral side.
[0005]
Next, the outer burr 107 extending in a substantially circular shape on the outer peripheral side at one end in the axial direction of the cylindrical member 106 is punched out, and the step of turning the surface layer is left as shown in FIG. The outer ring 108 is produced.
[0006]
[Problems to be solved by the invention]
By the way, in the above conventional manufacturing method, when the outer ring 108 is manufactured, the node 103 which becomes the inner burr of the cylindrical member 104 is discarded, but the volume of the node 103 has a considerable ratio with respect to the volume of the entire material. Therefore, the material cost is increased.
[0007]
Accordingly, an object of the present invention is to provide a method of manufacturing a rolling bearing that can reduce the material cost and can reduce the cost of the rolling bearing.
[0008]
[Means for Solving the Problems]
To achieve the above object, a rolling bearing manufacturing method according to the first aspect of the present invention includes an outer ring having a double row raceway on the inner periphery and a flange portion formed on the outer periphery, and two raceways each having one raceway on the outer periphery. A method of manufacturing a rolling bearing comprising one inner ring and a plurality of rolling elements arranged between the inner ring and the outer ring and constituting a hub unit ,
The material used as the outer ring is made of carbon steel corresponding to JIS standards S40C to S58C and SAE standards 1040 to 1095,
In the material used as the outer ring, an annular recess recessed in the axial direction in a substantially U-shaped cross section is formed,
The surface on the opposite side in the axial direction of the inner ring side portion of the bottom of the annular recess is a concave curved surface that continues to the inner peripheral surface of the material portion that becomes the outer ring,
The material that becomes one of the two inner rings is
Punched in the axial direction from the bottom of the annular recess of the material to be the outer ring, manufactured by punching from a part of the material to be the outer ring by forging ,
The material used for the inner ring, which has been punched and manufactured, is carbonitrided to form an inner ring having a fatigue life improved over that of the outer ring .
[0009]
According to the first aspect of the present invention, since the material that becomes one of the two inner rings is stamped and manufactured from a part of the material that becomes the outer ring, the material cost can be reduced, and the cost of the rolling bearing can be reduced. Can be planned.
[0010]
In the invention of claim 1, the outer ring and the inner ring raceway surfaces can be simultaneously formed by forming an annular recess recessed in the axial direction in a substantially U-shaped section in the material used as the outer ring. Further cost reduction can be achieved. Further, by punching the bottom of the annular recess in the axial direction, the material that becomes the inner ring can be easily separated from the material that becomes the outer ring. Further, it is possible to improve the dimensional accuracy of the shearing surface when the inner ring material is punched from the outer ring material and separated.
[0011]
In the invention of claim 1, the inner ring and the outer ring are made of carbon steel corresponding to JIS standards S40C to S58C and SAE standards 1040 to 1095 as the same material, so that the inner ring and the outer ring are made of the same material. The set ring forging can be formed, and the fatigue life of the inner ring can be improved compared to the outer ring by special heat treatment of the inner ring which has a shorter life than the outer ring when formed of the same material. Therefore, according to the present invention, it is possible to provide a rolling bearing having a low cost and a long life.
[0012]
In the invention of claim 1 , since the surface on the opposite side in the axial direction of the inner ring side portion at the bottom of the annular recess is a concave curved surface continuous with the inner peripheral surface of the material portion serving as the outer ring, forging is easy. Yes, mold life can be improved. In addition, it is possible to stably secure a turning allowance for the material that becomes the inner ring that is punched and separated from the material that becomes the outer ring.
[0013]
In the rolling bearing manufacturing method of one embodiment , the outer ring side axial dimension of the inner wall of the annular recess recessed in the axial direction in the substantially U-shaped cross section is set to 1.7 times or less the opening width of the annular recess. you formed.
[0014]
In this embodiment , forging is facilitated by forming the outer ring side axial dimension of the inner wall of the annular recess recessed in the axial direction in the substantially U-shaped cross section to be 1.7 times or less the opening width of the annular recess. Thus, the mold life can be improved. Note that if the outer ring side axial dimension exceeds 1.7 times the opening width, forging becomes difficult.
[0015]
Further, in the manufacturing method of a rolling bearing of an embodiment, the radius of curvature of the concave curved surface, shall be the least 8 mm.
[0016]
In this embodiment , by setting the radius of curvature of the concave curved surface to 8 mm or more, forging is facilitated and the die life can be improved. In addition, it is possible to stably secure a turning allowance for the material that becomes the inner ring that is punched and separated from the material that becomes the outer ring. In addition, it becomes difficult to forge if a curvature radius is less than 8 mm.
[0017]
Further, in the manufacturing method of inventions of a rolling bearing according to claim 1, said rolling bearing, that make up the hub unit.
[0018]
According to the manufacturing method of the first aspect of the present invention, the material cost can be reduced, and the hub unit including the rolling bearing can be manufactured at a low cost.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0020]
The rolling bearing manufacturing method of this embodiment is a manufacturing method of a rolling bearing that constitutes a hub unit, and the steps shown in FIGS. 2 (A) and 2 (B) are common to the above-described conventional example. The steps after FIG. 2B different from the example will be described.
[0021]
In this embodiment, the material 102 to be the outer ring shown in FIG. 2B is formed by die forging, and is formed into a cylindrical material 1 as a whole as shown in FIG.
[0022]
This material 1 has curved surfaces 2 and 3 that become raceways by turning the skin layer on the inner circumferential surface 5A, and a portion 5 that becomes an outer ring having a portion 4 that becomes a flange on the outer circumference, and an inner ring. It has a portion 6. Note that the lower half of the center line in FIG. 1A shows a state after the portion 6 serving as the inner ring is cut out.
[0023]
The inner ring portion 6 is connected to the inner circumferential surface 5A of the outer ring portion 5, and the outer circumferential surface 6A has a curved shape serving as a raceway surface. The curved outer peripheral surface 6A is smoothly continuous with the inner curved surface 3 of the outer ring portion 5, and the curved surface 3 and the outer peripheral surface 6A are recessed in the axial direction having a substantially U-shaped cross section. An annular recess 7 is formed. As shown in FIG. 1, the outer ring side axial dimension b of the inner wall 7A of the annular recess 7 was set to 1.7 times or less the opening width a of the annular recess 7.
[0024]
In addition, the portion 6 that becomes the inner ring has a concave curved surface 6B that is continuous with the inner peripheral surface 5A of the portion 5 that becomes the outer ring, on the surface opposite to the outer peripheral surface 6A in the axial direction. The radius of curvature R1 of the concave curved surface 6B is 8 mm or more.
[0025]
Next, the material 1 shown in FIG. 1 (A) is punched from the bottom of the annular recess 7, and the portion 6 serving as the inner ring is punched in the axial direction along the shear plane S1. Further, the annular portion 11 surrounded by the concave curved surface 6B, the shear surface S1, and the end surface extension surface 9 is cut out from the punched inner ring portion 6, and the surface layer is turned as shown in FIG. Thus, the material portion 19 before becoming the inner ring is obtained. This turning process the material before part 19 is turned a predetermined surface layer not shown further, is subjected to special heat treatment of carbonitriding treatment, the inner ring 12 described later.
[0026]
On the other hand, in the remaining outer ring portion 5 obtained by punching the inner ring portion 6 from the material 1, a predetermined surface layer (not shown) is turned so that, for example, as shown in FIG. The outer ring 15 is provided on the inner periphery and has the flange 16 on the outer periphery.
[0027]
FIG. 3 shows the hub unit 20 and includes a rolling bearing 21 of the double row angular ball bearing type. The hub unit 20 includes a rotating shaft member 22, an inner ring 12 fitted and fixed to the shaft portion 22 </ b> A of the shaft member 22, and a radially outer portion of a raceway portion 22 </ b> B forming the inner ring of the inner ring 12 and the rotating shaft member 22. The outer ring 15 is disposed opposite to the outer ring 15. A plurality of balls 23 are arranged at a predetermined interval in the circumferential direction between the raceway 13 of the outer ring 15 and the raceway portion 22B, and also between the raceway 14 of the outer ring 15 and the raceway surface 25 of the inner ring 12 in the circumferential direction. A plurality of balls 24 are arranged at predetermined intervals.
[0028]
According to the manufacturing method of the rolling bearing of the above embodiment, the portion 6 that becomes the inner ring 12 is punched and manufactured from a part of the material 1 including the portion 5 that becomes the outer ring 15, so that the material cost can be reduced and the rolling bearing can be reduced. 21 costs can be reduced.
[0029]
In this embodiment, the inner ring 12 and the outer ring 15 are made of the same material S55C, so that set forging in which the inner ring 12 and the outer ring 15 are formed from the same material 1 is possible, and the inner ring 12 and the outer ring 15 are formed of the same material S55C. In this case, the fatigue life of the inner ring 12 can be improved compared to the outer ring 15 by subjecting the inner ring 12 having a shorter life than the outer ring 15 to the above-described special heat treatment. Therefore, according to this embodiment, the rolling bearing 21 having a low cost and a long life can be provided.
[0030]
Moreover, in this embodiment, the curved surface 3 and the outer peripheral surface 6A, which are the raceway surfaces of the outer ring 15 and the inner ring 12, are simultaneously formed in the material 1 by forming the annular recess 7 that is recessed in the axial direction in a substantially U-shaped cross section. Since it can be formed, the cost can be further reduced. Further, by punching in the axial direction from the bottom of the annular recess 7, the portion 6 that becomes the inner ring 12 can be easily separated from the material 1 that becomes the outer ring 15. Further, it is possible to improve the dimensional accuracy of the shearing surface S1 when the material portion 6 to be the inner ring 12 is punched and separated from the material portion 5 to be the outer ring 15.
[0031]
Further, in this embodiment, since the surface on the opposite side in the axial direction of the inner ring side portion at the bottom of the annular recess 7 is a concave curved surface 6B continuous with the inner peripheral surface 5A of the material portion 5 to be the outer ring 15, forging is easy. Thus, the mold life can be improved. Further, it is possible to stably secure a turning allowance for the material 6 that becomes the inner ring 12 that is punched out from the material 1 and separated.
[0032]
Further, in this embodiment, the outer ring side axial dimension b of the inner wall 7A of the annular recess 7 that is recessed in the axial direction in a substantially U-shaped cross section is formed to be 1.7 times or less the opening width a of the annular recess 7. As a result, forging is facilitated and the die life can be improved.
[0033]
In this embodiment, by setting the radius of curvature R1 of the concave curved surface 6B to 8 mm or more, forging is facilitated and the die life can be improved. In addition, it is possible to stably secure a turning allowance for the material 6 that becomes the inner ring 12 that is punched and separated from the material 1 that becomes the outer ring 15.
[0034]
Further, according to the manufacturing method of this embodiment, the material cost can be reduced, and the hub unit 20 including the rolling bearing 21 can be manufactured at a low cost.
[0035]
In the above embodiment, although the material of the blank 1 was JIS standard S55C, in addition to this, JIS standard S40C～S58C, may be used carbon steel such as SAE Standard 1040-1095.
[0036]
【The invention's effect】
As apparent from the above, in the rolling bearing manufacturing method according to the first aspect of the present invention, the material used as one inner ring is punched and manufactured from a part of the material used as the outer ring, so that the material cost can be reduced and the rolling is achieved. The cost of the bearing can be reduced. In the invention of claim 1, the outer ring and the inner ring raceway surfaces can be simultaneously formed by forming an annular recess recessed in the axial direction in a substantially U-shaped section in the material used as the outer ring. Further cost reduction can be achieved. Further, by punching the bottom of the annular recess in the axial direction, the material that becomes the inner ring can be easily separated from the material that becomes the outer ring. Further, it is possible to improve the dimensional accuracy of the shearing surface when the inner ring material is punched from the outer ring material and separated.
[0037]
Further, in the invention of claim 1 , since the inner ring and the outer ring are made of carbon steel as the same material, set forging in which the inner ring and the outer ring are formed from the same material is possible, and the inner ring and the outer ring are formed of the same material. In this case, the fatigue life of the inner ring can be improved as compared with the outer ring by subjecting the inner ring to a shorter life than the outer ring. Therefore, according to the present invention, it is possible to provide a rolling bearing having a low cost and a long life.
[0038]
Moreover, in the invention of claim 1 , forging is easy because the surface on the opposite side in the axial direction of the inner ring side portion of the bottom of the annular recess is a concave curved surface continuous with the inner peripheral surface of the material portion serving as the outer ring. , The mold life can be improved. In addition, it is possible to stably secure a turning allowance for the material that becomes the inner ring that is punched and separated from the material that becomes the outer ring.
[0039]
Further, in one embodiment , the outer ring side axial dimension of the inner wall of the annular recess recessed in the axial direction in the substantially U-shaped cross section is formed to be 1.7 times or less the opening width of the annular recess. Can be made easier and the mold life can be improved.
[0040]
Moreover, in one Embodiment , metal mold | die lifetime can be improved by making the curvature radius of the said concave curved surface into 8 mm or more. Further, it is possible to improve the dimensional accuracy of the shearing surface when the inner ring material is punched from the outer ring material and separated. In addition, it is possible to stably secure a turning allowance for the material that becomes the inner ring that is punched and separated from the material that becomes the outer ring.
[0041]
Further, according to the manufacturing method of the invention of claim 1 , the material cost can be reduced, and the hub unit including the rolling bearing can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 (A) is a cross-sectional view for explaining main steps of an embodiment of a rolling bearing manufacturing method according to the present invention, and FIG. It is sectional drawing of the raw material 19 before becoming the inner ring | wheel 12.
2 (A) to 2 (E) are diagrams sequentially illustrating steps of a conventional method for manufacturing a rolling bearing.
FIG. 3 is a cross-sectional view of a hub unit including a rolling bearing manufactured in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylindrical material, 2, 3 ... Curved surface, 4 ... Flange part,
5 ... a portion to be an outer ring, 5A ... an inner peripheral surface, 6 ... a portion to be an inner ring, 6A ... an outer peripheral surface,
6B ... concave curved surface, 7 ... annular recess, 7A ... inner wall, a ... opening width,
b: Outer ring side axial dimension, S1: Shear surface, R1: Radius of curvature, 9: End surface extension surface,
11 ... Annular part, 12 ... Inner ring, 13, 14 ... Track, 15 ... Outer ring,
16 ... Flange, 20 ... Hub unit, 21 ... Rolling bearing, 22 ... Shaft member,
22A ... shaft part, 22B ... track part, 23, 24 ... ball.

Claims (2)

内周に複列の軌道を有し外周にフランジ部が形成された外輪と、外周に各々１つの軌道を有する２つの内輪と、上記内輪と外輪との間に配置された複数の転動体からなると共にハブユニットを構成する転がり軸受を製造する方法であって、
上記外輪となる素材は、ＪＩＳ規格Ｓ４０Ｃ〜Ｓ５８Ｃ , ＳＡＥ規格１０４０〜１０９５に該当する炭素鋼で構成され、
上記外輪となる素材に、断面略Ｕ字形状に軸方向に窪んだ環状凹部を形成し、
上記環状凹部の底の内輪側部分の軸方向反対側の面を、外輪となる素材部分の内周面に連なる凹湾曲面とし、
上記２つの内輪のうちの一方の内輪となる素材は、
上記外輪となる素材の上記環状凹部の底から軸方向に打ち抜いて、上記外輪となる素材の一部から鍛造により打ち抜き製造し、
打ち抜き製造した上記内輪となる素材を、浸炭窒化処理することで、外輪よりも疲労寿命が向上した内輪とすることを特徴とする転がり軸受の製造方法。An outer ring having a double-row track on the inner periphery and a flange portion formed on the outer periphery, two inner rings each having one track on the outer periphery, and a plurality of rolling elements disposed between the inner ring and the outer ring. And a method of manufacturing a rolling bearing constituting a hub unit ,
The material used as the outer ring is made of carbon steel corresponding to JIS standards S40C to S58C and SAE standards 1040 to 1095,
In the material used as the outer ring, an annular recess recessed in the axial direction in a substantially U-shaped section is formed,
The surface on the opposite side in the axial direction of the inner ring side portion of the bottom of the annular recess is a concave curved surface that continues to the inner peripheral surface of the material portion that becomes the outer ring
The material that becomes one of the two inner rings is
Punched in the axial direction from the bottom of the annular recess of the material to be the outer ring, manufactured by punching from a part of the material to be the outer ring by forging ,
A method of manufacturing a rolling bearing, characterized in that a material for forming the inner ring that has been punched and manufactured is carbonitrided to obtain an inner ring having a fatigue life improved over that of the outer ring . 内周に複列の軌道を有し外周にフランジ部が形成された外輪と、外周に各々１つの軌道を有する２つの内輪と、上記内輪と外輪との間に配置された複数の転動体からなる転がり軸受であって、
上記外輪となる素材はＪＩＳ規格Ｓ４０Ｃ〜Ｓ５８Ｃ , ＳＡＥ規格１０４０〜１０９５に該当する炭素鋼で構成され、
上記外輪となる素材は、断面略Ｕ字形状に軸方向に窪んだ環状凹部と、上記環状凹部の底の内輪側部分の軸方向反対側の面が外輪となる素材部分の内周面に連なる凹湾曲面とを有し、
上記２つの内輪のうちの一方の内輪となる素材は、上記外輪となる素材の一部を上記環状凹部の底から鍛造により軸方向に打ち抜くことにより製造され、 上記打ち抜き製造された内輪は、浸炭窒化処理されることで、上記外輪よりも疲労寿命が向上されていることを特徴とする転がり軸受。An outer ring having a double-row track on the inner periphery and a flange portion formed on the outer periphery, two inner rings each having one track on the outer periphery, and a plurality of rolling elements disposed between the inner ring and the outer ring. A rolling bearing comprising
The material used as the outer ring is made of carbon steel corresponding to JIS standards S40C to S58C and SAE standards 1040 to 1095 ,
The material used as the outer ring has an annular recess recessed in the axial direction in a substantially U-shaped cross section, and an axially opposite surface of the inner ring side portion at the bottom of the annular recess is continuous with the inner peripheral surface of the material part serving as the outer ring. A concave curved surface,
The inner ring material of one of the two inner rings is manufactured by punching a part of the outer ring material from the bottom of the annular recess in the axial direction by forging, and the punched inner ring is carburized. A rolling bearing characterized in that the fatigue life is improved by nitriding treatment as compared with the outer ring.
JP2001312649A 2001-10-10 2001-10-10 Rolling bearing manufacturing method and rolling bearing Expired - Fee Related JP4072326B2 (en)

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