JP3526323B2 - Manufacturing method of hub unit bearing outer ring - Google Patents
Manufacturing method of hub unit bearing outer ringInfo
- Publication number
- JP3526323B2 JP3526323B2 JP13148094A JP13148094A JP3526323B2 JP 3526323 B2 JP3526323 B2 JP 3526323B2 JP 13148094 A JP13148094 A JP 13148094A JP 13148094 A JP13148094 A JP 13148094A JP 3526323 B2 JP3526323 B2 JP 3526323B2
- Authority
- JP
- Japan
- Prior art keywords
- outer ring
- flange portion
- hole
- bolt
- flange
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- F16C19/185—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 two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
-
- 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
- F16C33/581—Raceways; Race rings integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels
-
- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は、自動車の車輪用軸受
等として使用されるハブユニット軸受の外輪の製造方法
に関する。
【０００２】
【従来の技術】従来、自動車の車輪用軸受として、図８
に示すハブユニット軸受が使用されている。この軸受
は、ハブと軸受外輪とを一体化させたものであり、複列
玉軸受における外輪５１をハブとして使用可能な形状と
してある。内輪５２は各列の転動体５３に対して個別に
形成した分割型のものとしてあり、車軸（図示せず）に
嵌合する。内輪５２と外輪５１の間には両端にシール５
４が設けてある。外輪５１は、軸方向中間に外向きのフ
ランジ部５１ａを有し、フランジ部５１ａのボルト孔５
６に挿通したボルト５７により、フランジ部５１ａの側
面に接する車輪（図示せず）が取付けられる。フランジ
部５１ａは、全体が略均等な肉厚に形成され、かつ車輪
接触側の側面ａに、車輪との当たりの平坦度を出すため
のリブが放射状に設けられている。外輪５１は、鍛造品
からなる外輪素材に旋削等の機械加工を施して、軌道溝
５５の形状やボルト孔５６回りの平坦な座面５６ａ、お
よび前記フランジ側面ａの平坦度を得ている。
【０００３】
【発明が解決しようとする課題】軸受外輪５１のフラン
ジ部５１ａは、ボルト孔５６の形成に伴う強度低下を補
えるだけの肉厚とされるが、全周を同じ肉厚としている
ため、ボルト孔５６から離れた箇所では無駄に厚くな
り、軸受外輪５１の重量が重いものとなっている。その
ため、自動車全体の軽量化の妨げとなっている。また、
この従来例では、フランジ部５１ａのボルト頭用座面５
６ａや、車輪接触側の側面ａを旋削で加工しているた
め、加工に手間がかかり、加工コストが高くなるという
問題点がある。このため、本発明者は、フランジ５１ａ
を平押しする冷間鍛造で、前記座面５６ａや側面ａの平
坦度を得ることを考えたが、全周に連続した平面のフラ
ンジ側面にボルト孔回りの座面５６ａを冷鍛で成形する
ことは難しかった。
【０００４】この発明の目的は、必要な強度を確保しな
がら、外輪の重量の低減が図れ、また製造過程で、フラ
ンジ部におけるボルト頭用の座面をプレスで平坦に成形
することが容易な形状のハブユニット軸受外輪を製造す
るについて、フランジ部の平坦度を無切削で容易に確保
できるハブユニット軸受外輪の製造方法を提供すること
である。
【０００５】
【課題を解決するための手段】この発明の製造方法で製
造するハブユニット軸受外輪は、内径面に転動体の軌道
溝を有する円筒状部の外周に車輪取付用のフランジ部が
設けられ、前記フランジ部にボルト孔が形成されたハブ
ユニット軸受外輪において、次の構成としたものであ
る。すなわち、前記フランジ部の車輪非接触側の側面
に、前記各ボルト孔の設けられる角度位置で半径方向に
延びる肉盛部を設ける。この肉盛部の前記ボルト孔の開
口周辺にボルト頭接触用の平坦な座面を設ける。この発
明方法は、前記ハブユニット軸受外輪の製造方法であっ
て、次の各工程を含む。まず、円筒状部の外周にフラン
ジ部が設けられ、かつ前記フランジ部の側面に半径方向
に延びる肉盛部が形成された外輪素材を鍛造する。この
外輪素材の前記フランジ部を両面からプレス型で挟み込
むことにより、前記ボルト孔の開口周辺に平坦な座面を
形成し、かつ前記フランジ部の前記肉盛部と反対側の側
面の平坦度を高める。この肉盛部と反対側のフランジ側
面は、通常は車輪接触面となる部分がリブ等の形成によ
って部分的となっているが、その場合は、この部分的な
車輪接触面の平坦度を前記プレス型による挟み付けによ
って高める。
【０００６】
【作用】この発明方法の製造対象となるハブユニット軸
受外輪は、フランジ部の各ボルト孔の設けられる角度位
置に半径方向に延びる肉盛部を設けたので、特に強度の
必要となるボルト孔付近の強度を確保しながら、他の部
分を薄肉として外輪全体の重量を低減させることができ
る。また、このようにボルト孔を肉盛部に設けるので、
ボルト頭の座面を冷間鍛造で成形する場合に、突出した
肉盛部のみの局部的な加圧ですみ、そのため座面の成形
が容易となる。また、この発明方法によると、外輪素材
のフランジ部を両面からプレス型で挟み込むため、ボル
ト孔の開口周片のボルト頭用座面と、その反対側の側面
における車輪接触面の平坦度を、無旋削で確保すること
ができる。
【０００７】
【実施例】この発明の一実施例を図１ないし図６に基づ
いて説明する。このハブユニット軸受外輪１は、図８の
軸受外輪５１に代えて、同図の内輪５２や転動体５３，
シール５４と共に組まれてアンギュラ型の複列玉軸受か
らなるハブユニット軸受を構成するものであり、次のよ
うに製造される。この製造方法では、フランジ部１ｂを
無切削化し、かつフランジ部１ｂにセレーション孔から
なるボルト孔４を２工程のプレス抜きで加工する。まず
軸受外輪１の完成状態の形状を説明する。
【０００８】軸受外輪１は、円筒状部１ａの外周に円板
状のフランジ部１ｂを有し、内径面に転動体の転走面と
なる２本の断面円弧状の軌道溝２が形成されている。フ
ランジ部１ｂは円筒状部１ａの中央よりも一端側に偏っ
て設けられ、軌道溝２は他端側に偏って設けられてい
る。また、円筒状部１ａの内径面の前記他端の開口縁に
はシール係合溝３が形成してある。フランジ部１ｂは、
前記一端側の側面ａに車輪（図示せず）を接して取付け
るものであり、周方向の複数箇所（図示の例では５箇
所）にボルト孔４が設けてある。
【０００９】フランジ部１ｂの断面形状は、ボルト孔４
を設けない一般部では、図１（Ａ）に破線で示し、また
図６の下半部に示すように、車輪に対する非対向側の側
面ｂがテーパ面となって外径側が漸次薄くなっている。
フランジ部１ｂの各ボルト孔４が設けられた角度位置に
は、リブ状の肉盛部５および車輪接触用のリブ６（図
３）が、前記非接触側の側面ｂおよび接触側の側面ａに
各々一体に設けられている。これら肉盛部５およびリブ
６は互いに同じ幅に形成され、各々円筒状部１ａからフ
ランジ部１ｂの略外径端まで半径方向に延びている。し
たがって、フランジ部１ｂの肉盛部５およびリブ６の設
けられた周方向部分は、両面に突出した厚肉部となって
いる。リブ６は、その正面の略全面が車輪に対する接触
面Ａとなるものであり、この接触面Ａは軸心Ｏに対して
垂直な平坦面とされている。この接触面Ａがフランジ基
準面となる。また、肉盛部５の背面における先端側部分
（図１（Ｂ）に斜線を施した部分）も、前記軸心Ｏに対
して垂直な平坦化面Ｂとされている。これら接触面Ａお
よび平坦化面Ｂは、後述の冷間鍛造により、すなわちサ
イジングの一種である平押しにより平坦度を高めてあ
る。
【００１０】ボルト孔４は、図５に拡大して示すよう
に、入口側部が所定深さＨのセレーション孔部４ａに、
出口側部が丸孔部４ｂに各々形成され、かつ入口側周辺
には座ぐり孔７が、出口側周辺にはバリ逃がし孔８が各
々形成されている。座ぐり孔７およびバリ逃がし孔８
は、いずれも浅い円孔としてあるが、必ずしも円形でな
くても良い。座ぐり孔７およびバリ逃がし孔８は、前記
の平押し時に同時に形成され、このとき座ぐり孔７の底
面が、平坦な座面７ａに形成される。丸孔部４ｂは、出
口側が広がったテーパ状となり、丸孔部４ｂのセレーシ
ョン孔部４ａとの隣接部は、セレーション孔部４ａにお
ける溝底面よりも内径が小径となったボルト圧入部４ｃ
に形成されている。なお、フランジ１ｂの肉盛部５を設
けない箇所は、必ずしもテーパ面とする必要はなく、ま
た車輪接触側の側面ａをテーパ面とし、あるいは両側面
ａ，ｂを共にテーパ面として外径側が漸次薄くなる断面
形状としても良い。
【００１１】つぎに製造方法を説明する。まず、図１
（Ｄ）に示す形状の外輪素材１0 を通常の熱間の鍛造で
形成する。この外輪素材１0 は、図３に示す外輪素材１
0 の冷間鍛造前の状態のものであるが、両者は略同様な
形状であるため、図３を用いて説明する。すなわち熱間
鍛造の完了時の外輪素材１0 は、円筒状部１ａの外周に
フランジ部１ｂを設け、かつフランジ部１ｂの両面に前
記肉盛部５およびリブ６を各々設けた形状のものであ
る。円筒状部１ａは、図３（Ｂ）に完成状態の外輪１の
断面形状を鎖線で示すように、外輪１に対して内径側と
両端の外径側部分に旋削代を設けた形状のものである。
この外輪素材１0 に、次のフランジ部１ｂの平押しと、
ボルト孔４のプレス抜きと、旋削とを施して図６の外輪
１とされる。
【００１２】平押しは、図１（Ｄ）および図２に示すよ
うに、各々プレス型である上型２１と、下型２２と、ダ
イス２３とを用いて行われる。ダイス２３は、下型２２
の昇降ガイド兼用の円筒面状の成形面２３ａを有し、ダ
イスホルダ２４上に固定されている。成形面２２ａの上
端は外広がりとなり、ダイス２３の成形面２３ａの下方
は、段部２３ｂを介して大径部となっている。下型２２
は、上面が平押し用の平坦な成形面となり、かつ上面に
各バリ逃がし孔８の成形用の突部２２ａを有するリング
状のものであり、ダイス２３の前記ガイド兼成形面２３
ａに昇降自在に嵌合している。下型２２は、復帰ばね２
５で上昇付勢されると共に、下端外周の係合突部２２ｂ
がダイス２３の段部２３ｂに係合して上昇位置が規制さ
れる。この状態で、下型２２の上面はダイス２３の上面
よりも上方位置にある。また、下型２２はダイスホルダ
２４に設けられたエジェクタピン２６により強制押し上
げ可能とされている。上型２１は、昇降駆動される上型
ホルダ２７（図１）の下面に設けられたリング状のもの
であり、下面が平押し用の平坦な成形面となり、かつこ
の下面に座ぐり孔成形用の突部２１ａが突設されてい
る。
【００１３】平押し過程では、図２（Ａ）のように外輪
素材１0 をそのフランジ部１ｂの車輪接触側面ｂが下型
２２上に載るようにセットし、上型２１を下降させてフ
ランジ部１ｂを押し下げる。これにより、フランジ部１
ｂが下型２２と共に下降してダイス２３内に入り、ダイ
ス２３の内周の成形面２３ａでフランジ部１ｂの外径サ
イジングが行われる。下型２２がダイスホルダ２４に接
するまで下降すると（図２（Ｂ））、フランジ部１ｂは
上下型２１，２２の間で強く挟まれ、これによりフラン
ジ部１ｂのリブ６における車輪接触面Ａと、フランジ部
１ｂの肉盛部５の先端側の平坦化面Ｂとの平坦度が高め
られる。すなわち冷間で平坦度のサイジングが行われ
る。そのため、両面Ａ，Ｂの平行度も高められる。ま
た、この平押し時に、上型２１の突部２１ａと下型２２
の突部２２ａとで、フランジ部１ｂの両面に座ぐり孔７
およびバリ逃がし孔８が成形され、図３に示す形状に外
輪素材１0 が仕上がる。成形が完了すると、上型２１を
上方へ逃がすと共に、エジェクタピン２６で下型２２を
突き上げて外輪素材１0 をダイス２３よりも上方に戻す
（図３（Ｃ））。エジェクタピン２６の使用により、フ
ランジ部１ｂがダイス２３の内周の成形面２３ａに圧接
状態となっていても外輪素材１0 の排出が可能となる。
【００１４】このように、外輪素材１0 のフランジ部１
ｂにおけるリブ６の車輪接触面Ａと肉盛部５の平坦化面
Ｂの平坦度を高めて両面Ａ，Ｂの平行度を出し、同時に
フランジ部１ｂの外径サイジングを行ってフランジ部１
ｂの車輪接触面Ａと外径面の直角度を出すことができ
る。また、これと同時に、フランジ部１ｂの座ぐり孔７
とバリ取り孔８とを成形し、座ぐり孔７の底面からなる
ボルト頭用の座面７ａに高い平坦度および車輪接触面Ａ
との平行度を得ることができる。しかも、これらのフラ
ンジ部１ｂの加工が全て無旋削で行える。肉盛部５の上
型２１による平押しや座ぐり孔７の成形は、フランジ部
１ｂの全周を加圧する場合と異なり、部分的に設けられ
る肉盛部５を潰すだけでよいため、比較的小さな加圧力
で容易に加工できる。
【００１５】図４は、ボルト孔４のプレス抜きを行う過
程を示す。この過程は、セレーション成形工程と、打ち
抜き工程との２工程で行い、各工程毎に別のプレス型が
使用される。セレーション成形工程では、図４（Ａ），
（Ｂ）に示すポンチ３１と、ダイス３２と、外径ガイド
３３と、ポンチストリッパ３９とを用いる。ダイス３２
は、リング状に形成されて外輪素材１0 の各ボルト孔４
を成形すべき位置に、これらボルト孔４の内径に対応す
る径の丸孔３２ａが設けられたものであり、外径ガイド
３３内に昇降自在に嵌合している。外径ガイド３３は、
ダイス３２よりも上方に延びて内径面で外輪素材１0 の
フランジ部１ｂを位置決めするものであり、下ホルダ３
４上に固定されている。下ホルダ３４にはダイス３２を
押し上げるエジェクタピン３５が設けられ、またダイス
３２の丸孔３２ａ内には受け部材３７が昇降自在に嵌合
し、復帰ばね３６で押し上げ付勢されている。
【００１６】ポンチ３１は、下端の小径部分の外径面が
セレーション成形用の凹凸面となったものであり、ダイ
ス３２の各丸孔３２ａと対応する複数本のものが、昇降
駆動される１つのポンチホルダ３８に固定されている。
ポンチストリッパ３９は、ポンチ３１の配列に沿うリン
グ状のものであり、周方向複数箇所に設けた各ポンチ収
容孔４０に、各ポンチ３１を相対的に昇降自在に貫通さ
せてある。ポンチストリッパ３９の下面には、各ポンチ
収容孔４０の開口周縁に、外輪素材１0 のフランジ部１
ｂの座面７ａを押さえる円形の突部３９ａが形成されて
いる。ポンチ収容孔４０は、中間部が大径となった段付
き孔とされ、ポンチ３１の上部に形成された拡径部３１
ｂがポンチ収容孔４０の上端の段面に係合してポンチス
トリッパ３９を支持している。この係合状態で、ポンチ
３１の下端面とポンチストリッパ３９の下端面とは略同
一高さとなる。また、各ポンチ収容孔４０内にはポンチ
ストリッパ３９を押し下げ付勢する押し出しばね４１が
収容されている。なおポンチストリッパ３９は、ばね４
１で付勢する代わりに、別の駆動装置を設けてポンチ３
１と独立して昇降させるようにしても良い。
【００１７】図４（Ｃ），（Ｄ）に示すように、打ち抜
き工程では、丸形のポンチ４３と、丸孔４４ａを有する
ダイス４４とを用いる。ダイス４４は、外輪素材１0 の
各ボルト孔４に対応する位置に前記丸孔４４ａを設けた
リング状のものであり、ダイホルダ４５上に設置されて
いる。ポンチ４３は、外輪素材１0 の各ボルト孔４と対
応する複数本のものが、昇降駆動されるポンチホルダ４
６に固定されている。
【００１８】この２工程のボルト孔プレス抜き工程で
は、まず前記の平押しの完了した外輪素材１0 を、図４
（Ａ）に示すように外径ガイド３３内に落とし込んでダ
イス３２上に配置し、同図（Ｂ）のようにポンチ３１を
下降させる。ポンチ３１は、外輪素材１0 のフランジ１
ｂに所定深さＨだけ押し込み、押し出しによる剪断で、
ポンチ３１の外径面形状が転写されたセレーション孔部
４ａを所定深さＨに成形する。いわゆる半抜きを行う。
このセレーション孔部４ａの深さＨは、ポンチ３１の昇
降ストロークの下死点で設定される。この成形後、ポン
チ３１を上昇復帰させる。このとき、ポンチストリッパ
３９は、ばね４１の付勢でフランジ部１ｂを押さえてお
り、ポンチ３１のセレーション孔部４ａからの抜き出し
を確実にする。また、受け部材３７は、ダイス３２の丸
孔３２ａ内に進入したセレーション孔部４ａの底部Ｓを
ばね３６の付勢で押し上げ、外輪素材１0 の外径ガイド
３３からの取り出しを容易にする。
【００１９】このようにセレーション孔部４ａを成形し
た外輪素材１0 は、次工程の図４（Ｃ）におけるダイス
４４上に載せ、パンチ４３を下降させてセレーション孔
部４ａの底部Ｓを打ち抜く（図４（Ｄ））。前記のダイ
ス４４上に外輪素材１0 を載せる過程では、各セレーシ
ョン孔部４ａの底部Ｓがダイス４４の丸孔４４ａに嵌ま
るので、外輪素材１0 は正確に位置決めされる。打ち抜
いた底部Ｓのカスはダイスホルダ４５上に落下する。こ
の打ち抜きにより成形された丸孔部４ｂは、図５に示す
ようにセレーション孔部４ａとの隣接部が小径のボルト
圧入部４ｃとなって、出口側が若干広がったテーパ状の
孔となる。すなわち、一般に打ち抜き加工したときの切
り口面は、剪断面部分が小径になっていて、その下に続
く破断面部分が出口側広がりのテーパ面となる。そのた
め単に丸形のポンチ４３で打ち抜くだけで、前記の小径
のボルト圧入部４ｃを有する出口側広がりの丸孔部４ｂ
が形成される。この場合、ボルト圧入部４ｃの内径面が
剪断面部分となり、テーパ孔部分が破断面部分となる。
このように２工程でプレス抜きすることにより、セレー
ション部４ａとその下側に隣接する小径のボルト圧入部
４ｃとを有するボルト孔４を、容易に能率良く形成する
ことができ、これによっても製造コストの低下が図れ
る。しかも、プレス抜きのため、従来の切削の場合のよ
うな加工硬化の問題がない。
【００２０】この孔加工の終了した外輪素材１0 は、内
径面と外径面の両端部とを旋削して図６に示すハブユニ
ット軸受外輪１とする。このように、外輪素材１0 のフ
ランジ部１ｂについては、平坦度の確保から、セレーシ
ョン付きのボルト孔４の加工まで、全く無旋削で、精度
良く、かつ能率良く加工することができる。また、この
ハブユニット軸受外輪１によると、フランジ部１ｂの各
ボルト孔４の設けられる角度位置に半径方向に延びる肉
盛部５を設けたので、特に強度の必要となるボルト孔４
付近の強度を確保しながら、他の部分を薄肉として外輪
１の全体の重量を低減させることができる。しかも、こ
のようにボルト孔４を肉盛部５に設けるので、ボルト頭
の座面７ａを冷間鍛造で成形する場合に、突出した肉盛
部５のみの局部的な加圧となり、そのため成形が容易と
なる。また、ボルト孔４は、セレーション孔部４ａおよ
びボルト圧入部４ｃを有するため、車輪固定用のセレー
ション付きボルト４９（図５）を挿入することにより、
ボルト４９の頭部の下に形成されたセレーションがボル
ト孔４のセレーション部４ａと噛み合ってボルト４の回
り止めトルクが確保され、また小径となったボルト圧入
部４ｃにボルト４の丸軸状の首が圧入状態となること
で、ボルト４の抜け止め力が得られる。ボルト孔４の出
口側には浅いバリ逃がし孔８が形成してあるが、そのた
めボルト孔４の打ち抜き工程で図５に示すようなバリ４
ｄが出口部に形成されても、バリ４ｄはバリ逃がし孔４
ｄ内に収まり、フランジ４ｂの車輪接触面Ａに突出する
ことがない。
【００２１】なお、前記実施例では軸受外輪１のフラン
ジ部１ｂに座ぐり孔７を設けたが、座ぐり孔７は必ずし
も設けなくても良い。その場合、図７に示すように肉盛
部５の平坦化面Ｂにおけるボルト孔４の周辺部分がボル
ト頭用の座面７ａとなる。この場合も、座面７ａに平坦
度のサイジングが行われているため、精度の良いボルト
締めが行える。
【００２２】
【発明の効果】この発明方法によると、フランジの側面
に半径方向に延びる肉盛部が形成された外輪素材を鍛造
し、前記フランジ部を両面からプレス型で挟み込むこと
により前記ボルト孔の開口周辺に前記座面を形成すると
共に、前記フランジ部の前記肉盛部と反対側の側面にお
ける車輪接触面部分の平坦度を高めるようにしたため、
前記フランジ部の平坦度を無切削で確保することができ
て、製造コストが低減される。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an outer ring of a hub unit bearing used as a bearing for a vehicle wheel. 2. Description of the Related Art Conventionally, as a vehicle wheel bearing, FIG.
The hub unit bearing shown in FIG. In this bearing, a hub and a bearing outer ring are integrated, and the outer ring 51 of the double row ball bearing is shaped so as to be usable as a hub. The inner ring 52 is of a split type separately formed for each row of rolling elements 53, and is fitted to an axle (not shown). Seals 5 are provided at both ends between the inner ring 52 and the outer ring 51.
4 are provided. The outer ring 51 has an outward flange portion 51a at an intermediate portion in the axial direction, and a bolt hole 5 of the flange portion 51a.
A wheel (not shown) that is in contact with the side surface of the flange portion 51a is attached by the bolt 57 inserted through the bolt 6. The entire flange portion 51a is formed to have a substantially uniform thickness, and ribs are provided radially on the side surface a on the wheel contact side to increase the flatness of the flange portion 51a against the wheel. The outer ring 51 is formed by machining such as turning on an outer ring material made of a forged product to obtain the shape of the raceway groove 55, the flat bearing surface 56a around the bolt hole 56, and the flatness of the flange side surface a. [0003] The flange portion 51a of the bearing outer ring 51 is made thick enough to compensate for the decrease in strength due to the formation of the bolt hole 56, but because the entire circumference has the same thickness. In addition, the portion far from the bolt hole 56 is wastefully thick, and the weight of the bearing outer ring 51 is heavy. This hinders the weight reduction of the entire vehicle. Also,
In this conventional example, the bolt head seat surface 5 of the flange portion 51a is provided.
Since the side 6a and the side surface a on the wheel contact side are processed by turning, there is a problem that the processing is troublesome and the processing cost is increased. For this reason, the present inventor has proposed that the flange 51 a
In order to obtain the flatness of the seat surface 56a and the side surface a by cold forging by flat pressing, the seat surface 56a around the bolt hole is formed by cold forging on the flange side surface of a flat surface continuous over the entire circumference. It was difficult. SUMMARY OF THE INVENTION It is an object of the present invention to reduce the weight of an outer ring while securing necessary strength, and to easily form a flat bearing surface for a bolt head in a flange portion by a press during a manufacturing process. Manufacturing hub unit bearing outer ring
Another object of the present invention is to provide a method of manufacturing a hub unit bearing outer ring that can easily secure flatness of a flange portion without cutting. [0005] The present invention relates to a method of manufacturing a semiconductor device according to the present invention .
The hub unit bearing outer ring to be manufactured is a hub unit bearing outer ring in which a flange portion for wheel attachment is provided on an outer periphery of a cylindrical portion having a raceway groove of a rolling element on an inner diameter surface, and a bolt hole is formed in the flange portion. It has the following configuration. That is, a built-up portion extending in a radial direction at an angular position where each of the bolt holes is provided is provided on a side surface of the flange portion on the wheel non-contact side. This opening around the bolt holes of the cladding portion Ru provided a flat seating surface for the bolt head contact. The method of the invention of this is a manufacturing method of the hub unit bearing outer ring, comprises the following steps. First, an outer ring material having a flange portion provided on the outer periphery of the cylindrical portion and having a built-up portion extending in a radial direction on a side surface of the flange portion is forged. By sandwiching the flange portion of the outer ring material from both sides with a press mold, a flat bearing surface is formed around the opening of the bolt hole, and the flatness of the side surface of the flange portion opposite to the build-up portion is reduced. Enhance. On the side of the flange opposite to the build-up portion, a portion that normally becomes a wheel contact surface is partially formed by forming a rib or the like, in which case, the flatness of the partial wheel contact surface is reduced by the flatness described above. Increased by pinching with a press die. A hub unit shaft to be manufactured by the method of the present invention.
Since the outer ring is provided with a built-up portion extending in the radial direction at the angular position where each bolt hole of the flange portion is provided, the other portions are thinned while securing strength near the bolt hole where strength is particularly required. The weight of the entire outer race can be reduced. In addition, since the bolt hole is provided in the overlay as described above,
When the seating surface of the bolt head is formed by cold forging, only a local pressurization of the protruding overlay portion is required, so that the seating surface is easily formed. Further, according to the method of the present invention, since the flange portion of the outer ring material is sandwiched between the press dies from both sides, the seating surface for the bolt head of the opening peripheral piece of the bolt hole, and the flatness of the wheel contact surface on the opposite side surface, It can be secured without turning. An embodiment of the present invention will be described with reference to FIGS. The hub unit bearing outer ring 1 is different from the bearing outer ring 51 of FIG. 8 in that the inner ring 52 and the rolling elements 53 of FIG.
A hub unit bearing composed of an angular double row ball bearing is assembled together with the seal 54, and is manufactured as follows. In this manufacturing method, the flange portion 1b is made non-cut, and a bolt hole 4 formed of a serration hole is formed in the flange portion 1b by two steps of press cutting. First, the shape of the completed bearing outer ring 1 will be described. The outer race 1 of the bearing has a disk-shaped flange portion 1b on the outer periphery of the cylindrical portion 1a, and two raceway grooves 2 having a circular cross section which are to be the rolling surfaces of the rolling elements are formed on the inner diameter surface. ing. The flange portion 1b is provided so as to be closer to one end side than the center of the cylindrical portion 1a, and the raceway groove 2 is provided so as to be closer to the other end side. A seal engagement groove 3 is formed at the opening edge of the other end of the inner diameter surface of the cylindrical portion 1a. The flange portion 1b
A wheel (not shown) is attached to the side surface a on the one end side, and bolt holes 4 are provided at a plurality of locations (five in the illustrated example) in the circumferential direction. The sectional shape of the flange portion 1b is as follows.
In the general part where no wheel is provided, the side surface b on the non-opposite side with respect to the wheel is a tapered surface as shown in a broken line in FIG. I have.
At the angular position where each bolt hole 4 is provided in the flange portion 1b, a rib-shaped overlay portion 5 and a wheel contact rib 6 (FIG. 3) are provided with the non-contact side surface b and the contact side surface a. Are provided integrally with each other. The built-up portion 5 and the rib 6 are formed to have the same width as each other, and each extend in the radial direction from the cylindrical portion 1a to a substantially outer diameter end of the flange portion 1b. Therefore, the circumferential portion of the flange portion 1b where the overlay portion 5 and the rib 6 are provided is a thick portion protruding from both surfaces. The substantially entire front surface of the rib 6 serves as a contact surface A with the wheel, and the contact surface A is a flat surface perpendicular to the axis O. This contact surface A becomes a flange reference surface. The front end portion (the hatched portion in FIG. 1B) on the back surface of the built-up portion 5 is also a flattened surface B perpendicular to the axis O. The flatness of the contact surface A and the flattened surface B is increased by cold forging described later, that is, by flat pressing which is a kind of sizing. As shown in an enlarged view in FIG. 5, the bolt hole 4 has a serration hole 4a having a predetermined depth H at the inlet side.
An outlet side portion is formed in each of the round holes 4b, and a counterbore hole 7 is formed around the inlet side, and a burr escape hole 8 is formed around the outlet side. Counterbore hole 7 and Burr escape hole 8
Are shallow circular holes, but are not necessarily circular. The counterbore hole 7 and the burr relief hole 8 are formed at the same time as the above flat pressing, and at this time, the bottom surface of the counterbore hole 7 is formed on a flat seat surface 7a. The round hole portion 4b has a tapered shape in which the outlet side is widened, and a portion of the round hole portion 4b adjacent to the serration hole portion 4a has a smaller diameter than the bottom surface of the groove in the serration hole portion 4a.
Is formed. The portion of the flange 1b where the overlay portion 5 is not provided need not necessarily be a tapered surface, and the side surface a on the wheel contact side is a tapered surface, or both side surfaces a and b are both tapered surfaces and the outer diameter side is The cross-sectional shape may become gradually thinner. Next, the manufacturing method will be described. First, FIG.
The outer ring material 1 0 having the shape shown in (D) is formed by forging between normal heat. The outer ring material 1 0 is the outer ring material 1 shown in FIG. 3
Although it is a state before cold forging of 0 , since both have substantially the same shape, they will be described with reference to FIG. That outer ring material 1 0 at the completion of the hot forging, the flange portion 1b is provided on the outer periphery of the cylindrical portion 1a, and those of each provided shape the overlaid portion 5 and the ribs 6 on both sides of the flange portion 1b is there. The cylindrical portion 1a has a shape in which a cutting allowance is provided on the inner diameter side and both outer diameter sides of the outer ring 1 with respect to the outer ring 1 as shown by a broken line in FIG. 3 (B). It is.
On the outer ring material 1 0, and the flat-pressing of the next of the flange portion 1b,
The outer ring 1 shown in FIG. 6 is obtained by subjecting the bolt holes 4 to press cutting and turning. As shown in FIGS. 1D and 2, the flat pressing is performed using an upper die 21, a lower die 22, and a die 23, each of which is a press die. The die 23 is a lower die 22
And has a cylindrical molding surface 23 a which also serves as an elevating guide, and is fixed on a die holder 24. The upper end of the molding surface 22a is widened outward, and the lower part of the molding surface 23a of the die 23 is a large diameter portion via a step 23b. Lower mold 22
Is a ring-shaped one having an upper surface that is a flat molding surface for flat pressing, and an upper surface having a projection 22 a for molding each of the flash relief holes 8.
a so as to be able to move up and down freely. The lower mold 22 includes the return spring 2
5 and the engagement protrusion 22b on the outer periphery of the lower end.
Engages with the step portion 23b of the die 23 to restrict the ascending position. In this state, the upper surface of the lower mold 22 is located higher than the upper surface of the die 23. The lower die 22 can be forcibly pushed up by an ejector pin 26 provided on a die holder 24. The upper die 21 is a ring-shaped member provided on the lower surface of an upper die holder 27 (FIG. 1) driven up and down. The lower surface is a flat molding surface for flat pressing, and a counterbore hole is formed on the lower surface. Projection 21a is provided. [0013] In the flat pressing process, and the outer ring material 1 0 is set as the wheel contact side b of the flange portion 1b rests on the lower die 22 lowers the upper die 21 as shown in FIG. 2 (A) Flange Press down the part 1b. Thereby, the flange portion 1
The b descends together with the lower mold 22 into the die 23, and the outer diameter of the flange portion 1b is sized on the inner peripheral forming surface 23a of the die 23. When the lower mold 22 is lowered until it comes into contact with the die holder 24 (FIG. 2B), the flange portion 1b is strongly sandwiched between the upper and lower molds 21 and 22, whereby the wheel contact surface A of the rib 6 of the flange portion 1b is formed. The flatness of the flange portion 1b with the flattening surface B on the tip side of the overlay portion 5 is increased. That is, sizing of flatness is performed in the cold. Therefore, the parallelism between the two surfaces A and B is also increased. Also, at the time of this flat pushing, the protrusion 21a of the upper mold 21 and the lower mold 22
Counterbore holes 7 on both sides of the flange portion 1b
And burr escape hole 8 is formed, the outer ring material 1 0 is finished into the shape shown in FIG. When molding is completed, the escape upper mold 21 upward, push up the lower mold 22 by the ejector pin 26 returns the outer ring material 1 0 above the die 23 (FIG. 3 (C)). The use of the ejector pins 26, the flange portion 1b is made possible to discharge the outer ring material 1 0 be the inner periphery of the molding surface 23a has a pressure contact state of the die 23. [0014] In this way, the flange portion 1 of the outer ring material 1 0
b, the flatness of the wheel contact surface A of the rib 6 and the flattening surface B of the overlay portion 5 are increased to obtain parallelism between the two surfaces A and B, and at the same time, the outer diameter of the flange portion 1b is sized to form the flange portion 1
The perpendicularity between the wheel contact surface A and the outer diameter surface b can be obtained. At the same time, a counterbore hole 7 of the flange portion 1b is formed.
And a deburring hole 8, and a high flatness and wheel contact surface A are provided on the bolt head seating surface 7 a formed by the bottom surface of the counterbore hole 7.
Can be obtained. In addition, all of the processing of these flange portions 1b can be performed without turning. The flat pressing and the formation of the counterbore 7 by the upper mold 21 of the overlay 5 are different from the case of pressurizing the entire circumference of the flange portion 1b. It can be easily processed with a very small pressing force. FIG. 4 shows a process of pressing the bolt holes 4 out. This process is performed in two steps, a serration forming step and a punching step, and another press die is used for each step. In the serration molding process, FIG.
A punch 31, a die 32, an outer diameter guide 33, and a punch stripper 39 shown in FIG. Dice 32
, Each bolt hole 4 of the outer ring material 1 0 is formed in a ring shape
Is formed at a position where is to be formed, and a round hole 32 a having a diameter corresponding to the inner diameter of the bolt hole 4 is provided. The outer diameter guide 33 is
It is intended to position the outer race raw material 1 0 of the flange portion 1b in the inner diameter surface extends above the die 32, the lower holder 3
4 fixed on. An ejector pin 35 for pushing up the die 32 is provided on the lower holder 34, and a receiving member 37 is fitted in the round hole 32 a of the die 32 so as to be able to move up and down, and is pushed up and urged by a return spring 36. The punch 31 has a small-diameter portion at the lower end formed with an irregular surface for serration molding. A plurality of punches 31 corresponding to the respective round holes 32a of the die 32 are driven up and down. Fixed to one punch holder 38.
The punch stripper 39 has a ring shape along the arrangement of the punches 31, and the punches 31 are passed through the punch receiving holes 40 provided at a plurality of positions in the circumferential direction so as to be relatively movable up and down. The lower surface of the punch stripper 39, the periphery of the opening of the punch receiving hole 40, the flange portion 1 of the outer race blank 1 0
A circular projection 39a for holding the seating surface 7a of b is formed. The punch accommodating hole 40 is a stepped hole having a large diameter at an intermediate portion, and an enlarged diameter portion 31 formed at an upper portion of the punch 31.
b is engaged with the step surface at the upper end of the punch receiving hole 40 to support the punch stripper 39. In this engaged state, the lower end surface of the punch 31 and the lower end surface of the punch stripper 39 are substantially at the same height. Further, in each punch accommodating hole 40, an extruding spring 41 that pushes down and urges the punch stripper 39 is accommodated. The punch stripper 39 includes a spring 4
Instead of energizing at 1, a separate drive is provided to
It may be lifted and lowered independently of 1. As shown in FIGS. 4C and 4D, in the punching step, a round punch 43 and a die 44 having a round hole 44a are used. Die 44 is intended to positions corresponding to the bolt holes 4 of the outer ring material 1 0 of the round hole 44a and provided a ring-shaped, is placed on the die holder 45. Punch 43, a punch holder 4 as a plurality of corresponding to the bolt holes 4 of the outer ring material 1 0, which is driven to be raised or lowered
6 fixed. [0018] In the bolt hole punching step of the 2 step, first the outer ring material 1 0 completing the pressing flat of the, 4
As shown in FIG. 2A, the punch 31 is dropped into the outer diameter guide 33 and placed on the die 32, and the punch 31 is lowered as shown in FIG. Punch 31, the flange 1 of the outer ring material 1 0
b to a predetermined depth H, and by shearing by extrusion,
The serration hole 4a to which the outer diameter surface shape of the punch 31 has been transferred is formed to a predetermined depth H. The so-called half blanking is performed.
The depth H of the serration hole 4a is set at the bottom dead center of the vertical stroke of the punch 31. After this molding, the punch 31 is raised and returned. At this time, the punch stripper 39 presses the flange portion 1b by the bias of the spring 41, and ensures that the punch 31 is extracted from the serration hole portion 4a. Also, receiving member 37 pushes up the bottom S of the serration hole 4a which has entered into the round hole 32a of the die 32 by the urging force of the spring 36, to facilitate removal from the outer ring blank 1 0 having an outer diameter of the guide 33. [0019] The outer ring material 1 0 molded serration hole portion 4a as is placed on the die 44 in view of the next step 4 (C), punched bottom S of the serration hole portion 4a lowers the punch 43 ( FIG. 4 (D)). In the process of mounting the outer ring material 1 0 on the die 44, the bottom S of the serration hole portion 4a so Hamamaru the round hole 44a of the die 44, the outer ring material 1 0 is accurately positioned. The scum of the punched bottom S falls onto the die holder 45. As shown in FIG. 5, the round hole portion 4b formed by this punching becomes a small-diameter bolt press-fit portion 4c at the portion adjacent to the serration hole portion 4a and becomes a tapered hole slightly widened on the outlet side. That is, in general, the cut surface at the time of the punching process has a small diameter at the sheared surface portion, and a fractured surface portion below the cut surface portion is a tapered surface that expands on the outlet side. Therefore, by simply punching out with a round punch 43, the round hole portion 4b having the small-diameter bolt press-fitting portion 4c and expanding on the outlet side is provided.
Is formed. In this case, the inner diameter surface of the bolt press-fitting portion 4c becomes a shear surface portion, and the tapered hole portion becomes a fracture surface portion.
By pressing in two steps in this manner, the bolt hole 4 having the serrated portion 4a and the small-diameter bolt press-fitting portion 4c adjacent to the serrated portion 4a can be easily and efficiently formed, and the manufacturing process is also possible. Cost can be reduced. In addition, there is no problem of work hardening as in the case of conventional cutting due to press cutting. The outer blank 1 0 terminated in the hole machining, the hub unit bearing outer ring 1 shown in FIG. 6 and both end portions of the inner surface and the outer diameter surface and turning. Thus, for the outer ring material 1 0 of the flange portion 1b, the securing flatness, to the processing of bolt holes 4 with serrations, in exactly the free turning can be accurately and efficiently processed. Further, according to the hub unit bearing outer ring 1, since the built-up portion 5 extending in the radial direction is provided at the angular position where each bolt hole 4 of the flange portion 1b is provided, the bolt hole 4 particularly requiring strength is provided.
The other parts can be made thin while reducing the overall weight of the outer race 1 while securing the strength in the vicinity. In addition, since the bolt hole 4 is provided in the overlay portion 5 in this manner, when the seating surface 7a of the bolt head is formed by cold forging, only the protruding overlay portion 5 is locally pressurized. Becomes easier. Further, since the bolt hole 4 has the serration hole portion 4a and the bolt press-fitting portion 4c, by inserting the serrated bolt 49 (FIG. 5) for fixing the wheel,
Serrations formed under the heads of the bolts 49 mesh with the serrations 4a of the bolt holes 4 to secure the detent torque of the bolts 4, and the small diameter bolt press-fitting portions 4c have the round shaft-like shape of the bolts 4. When the neck is in the press-fit state, the retaining force of the bolt 4 is obtained. A shallow burr release hole 8 is formed at the outlet side of the bolt hole 4. Therefore, in the step of punching the bolt hole 4, a burr 4 as shown in FIG.
Even if d is formed at the outlet portion, the burr 4d is formed in the burr release hole 4
d and does not protrude to the wheel contact surface A of the flange 4b. In the above embodiment, the counterbore hole 7 is provided in the flange portion 1b of the bearing outer ring 1, but the counterbore hole 7 is not necessarily provided. In that case, as shown in FIG. 7, the peripheral portion of the bolt hole 4 on the flattened surface B of the overlay portion 5 becomes a seat surface 7a for a bolt head. Also in this case, since the sizing of the flatness is performed on the seat surface 7a, it is possible to perform the bolt tightening with high accuracy. [0022] According to this invention a method according to the present invention, the bolt by sandwiching forged outer material overlaid portion extending radially to the side surface of the flange is formed, the flange portion from both sides in the press mold Because the seating surface is formed around the opening of the hole, and the flatness of the wheel contact surface portion on the side surface of the flange portion opposite to the buildup portion is increased.
The flatness of the flange portion can be secured without cutting, and the manufacturing cost is reduced.
【図面の簡単な説明】
【図１】（Ａ）はこの発明の一実施例にかかる製造方法
で製造するハブユニット軸受外輪の部分断面図、（Ｂ）
はその部分背面図、（Ｃ）は同図（Ｂ）のＣ−Ｃ断面
図、（Ｄ）は同外輪のフランジ平押し過程の断面図であ
る。
【図２】同外輪のフランジ平押し過程の工程図である。
【図３】（Ａ）は外輪素材のフランジ平押し後の状態を
示す切欠正面図、（Ｂ）は同破断側面図、（Ｃ）は同切
欠背面図である。
【図４】外輪素材のセレーション孔プレス抜き工程の工
程説明図である。
【図５】ハブユニット軸受外輪のボルト孔周辺部の拡大
断面図である。
【図６】ハブユニット軸受外輪の完成状態の断面図であ
る。
【図７】（Ａ）は他のハブユニット軸受外輪の部分背面
図、（Ｂ）はそのＢ−Ｂ断面図である。
【図８】従来例の断面図である。
【符号の説明】
１…ハブユニット軸受外輪、１0 …外輪素材、１ａ…円
筒状部、１ｂ…フランジ部、２…軌道溝、４…ボルト
孔、５…肉盛部、６…リブ、７…座ぐり孔、７ａ…座
面、８…バリ逃がし孔、２１…上型（プレス型）、２２
…下型（プレス型）、Ａ…車輪接触面、Ｂ…平坦化面BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) is a manufacturing method that written to an embodiment of the present invention
Partial cross-sectional view of the wafer subunit bearing outer ring to produce in, (B)
Is a partial rear view thereof, (C) is a cross-sectional view taken along the line CC of FIG. (B), and (D) is a cross-sectional view of the outer ring in a process of flat pressing a flange. FIG. 2 is a process chart of a flange flat pressing process of the outer race. 3 (A) is a cutaway front view showing a state of the outer race material after flat pressing of a flange, FIG. 3 (B) is a cutaway side view, and FIG. 3 (C) is a cutaway rear view. FIG. 4 is an explanatory diagram of a serration hole press punching process of the outer race material. FIG. 5 is an enlarged sectional view of a portion around a bolt hole of a hub unit bearing outer ring. FIG. 6 is a sectional view of a completed state of the hub unit bearing outer ring. 7 (A) is a partial rear view of another C subunit bearing outer ring, a (B) is its sectional view taken along line B-B. FIG. 8 is a sectional view of a conventional example. [Reference Numerals] 1 ... hub unit bearing outer ring, 1 0 ... outer material, 1a ... cylindrical portion, 1b ... flange portion, 2 ... raceway groove 4 ... bolt hole, 5 ... cladding portion, 6 ... ribs, 7 ... counterbore hole, 7a ... seat surface, 8 ... burr release hole, 21 ... upper die (press die), 22
... Lower mold (press mold), A: Wheel contact surface, B: Flattened surface
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ１６Ｃ 33/64 Ｆ１６Ｃ 33/64 (58)調査した分野(Int.Cl.7，ＤＢ名) F16C 19/00 - 19/56 F16C 33/58 - 33/64 B21D 53/86 B21D 53/10 B60B 27/02 B60B 35/18 B60B 37/00 B21K 23/04 ──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 7 identification code FI F16C 33/64 F16C 33/64 (58) Investigated field (Int.Cl. 7 , DB name) F16C 19/00-19/56 F16C 33/58-33/64 B21D 53/86 B21D 53/10 B60B 27/02 B60B 35/18 B60B 37/00 B21K 23/04
Claims (1)
部の外周に車輪取付用のフランジ部が設けられ、前記フ
ランジ部にボルト孔が形成されたハブユニット軸受外輪
において、前記フランジ部の車輪非接触側の側面に、前
記各ボルト孔の設けられる角度位置で半径方向に延びる
肉盛部を設け、この肉盛部の前記ボルト孔の開口周辺に
ボルト頭接触用の平坦な座面を設けたハブユニット軸受
外輪を製造する方法であって、円筒状部の外周にフラン
ジ部が設けられ、かつ前記フランジ部の側面に半径方向
に延びる肉盛部が形成された外輪素材を鍛造する過程
と、前記フランジ部を両面からプレス型で挟み込むこと
により前記ボルト孔の開口周辺に前記座面を形成すると
共に、前記フランジ部の前記肉盛部と反対側の側面にお
ける車輪接触面部分の平坦度を高める過程とを含むハブ
ユニット軸受外輪の製造方法。(57) [Claim 1] A cylindrical shape having a raceway groove of a rolling element on an inner diameter surface.
A flange portion for wheel attachment is provided on the outer periphery of the
Hub unit bearing outer ring with bolt holes formed in the flange
In the side of the flange portion on the wheel non-contact side,
It extends in the radial direction at the angular position where each bolt hole is provided
An overlay is provided around the opening of the bolt hole in the overlay.
A method for manufacturing a hub unit bearing outer ring provided with a flat bearing surface for contacting a bolt head , wherein a flange portion is provided on an outer periphery of a cylindrical portion, and a built-up portion extending in a radial direction on a side surface of the flange portion. The process of forging the outer ring material having the formed therein, and forming the seating surface around the opening of the bolt hole by sandwiching the flange portion from both sides with a press die, and the opposite side of the flange portion from the build-up portion. Increasing the flatness of the wheel contact surface portion on the side surface of the hub unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13148094A JP3526323B2 (en) | 1994-05-20 | 1994-05-20 | Manufacturing method of hub unit bearing outer ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13148094A JP3526323B2 (en) | 1994-05-20 | 1994-05-20 | Manufacturing method of hub unit bearing outer ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07317755A JPH07317755A (en) | 1995-12-08 |
| JP3526323B2 true JP3526323B2 (en) | 2004-05-10 |
Family
ID=15058966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13148094A Expired - Fee Related JP3526323B2 (en) | 1994-05-20 | 1994-05-20 | Manufacturing method of hub unit bearing outer ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3526323B2 (en) |
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-
1994
- 1994-05-20 JP JP13148094A patent/JP3526323B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07317755A (en) | 1995-12-08 |
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