JP2004122345A - Unit assembly and its broaching method - Google Patents

Unit assembly and its broaching method Download PDF

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Publication number
JP2004122345A
JP2004122345A JP2002294180A JP2002294180A JP2004122345A JP 2004122345 A JP2004122345 A JP 2004122345A JP 2002294180 A JP2002294180 A JP 2002294180A JP 2002294180 A JP2002294180 A JP 2002294180A JP 2004122345 A JP2004122345 A JP 2004122345A
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Japan
Prior art keywords
hollow hole
broach
unit assembly
broaching
hole
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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
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JP2002294180A
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Japanese (ja)
Inventor
Soichi Sumiya
角谷 宗一
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Nachi Fujikoshi Corp
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Nachi Fujikoshi Corp
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Publication date
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Priority to JP2002294180A priority Critical patent/JP2004122345A/en
Publication of JP2004122345A publication Critical patent/JP2004122345A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14Bearings 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
    • F16C19/18Bearings 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
    • F16C19/181Bearings 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
    • F16C19/183Bearings 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
    • F16C19/184Bearings 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
    • F16C19/186Bearings 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00Articles relating to transporting
    • F16C2326/01Parts of vehicles in general
    • F16C2326/02Wheel hubs or castors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/58Raceways; Race rings
    • F16C33/64Special methods of manufacture
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063Fixing them on the shaft
    • F16C35/0635Fixing them on the shaft the bore of the inner ring being of special non-cylindrical shape which co-operates with a complementary shape on the shaft, e.g. teeth, polygonal sections

Landscapes

  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a unit assembly having a working hole high in precision even when a hollow hole is deformed by caulking, etc. and its broaching method. <P>SOLUTION: The working hole 14b is worked in the hollow hole by moving a helical tooth groove broach 31 in the vertical direction by placing the unit assembly 1 integrally assembling a bearing 12 having a plurality of balls 17 and an outer ring 16 on the outer peripheral side by irreversibly deforming a part 14 which the hollow hole 2 has on a horizontal table 36 through a tool 37 so that the hollow hole becomes vertical. The working hole 14b is drilled at broaching speed of more than 10m/min and less than 80m/min dry or by applying a small amount of mist by removing chips attached on a broach tooth by a chip brush 32 arranged on a lower surface of the tool or in the inside 38 of the tool and a plurality of air blow nozzles 33 arranged in the proximity of and against the broach tooth 31a of the broach below the tool. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、中空の軸状部品の外側に軸受を有する自動車用ハブユニット等のユニット組立品に代表される中空穴を有するユニット組立品及びそのブローチ加工方法に関する
【0002】
【従来の技術】
中空の軸状部品の外側に軸受を有し、中空穴(貫通穴)にスプライン部を有する、自動車のハブユニットなどのユニット組立品は、例えば図2に示すように、ハブホイール11の軸14の外周に転がり軸受12を装着し、軸の軸端をローリングかしめにより径方向外向きに膨出変形させてかしめ部14aを形成し、このかしめ部で軸受内輪15の端面にかしめ付けることで軸受12に予圧と抜け止めを行っている。かかるハブユニット10の駆動輪用の軸にはドライブシャフト20がスプライン結合により挿入されるインボリュートスプライン穴14aが形成された中空穴2が設けられている。このインボリュートスプライン穴14aは、組み立て工程で加えられるかしめ力により変形することがあり、ドライブシャフト等の相手部品が嵌入できなくなるなどの問題があった。さらに、かしめによるものは非可逆的変形であり、変形したものは、かしめを外しても元に戻ることがなく、また、再加工は困難であり製品として使用できない場合がほとんどである。そこで、ハブユニットの中空穴のスプライン形成部とかしめ部との間に緩衝部分を設け、製品設計面から、スプラインの変形を少なくしていた(例えば、特許文献1参照。)。
【0003】
【特許文献1】
特開2002−29210号公報(図2、図5)
【0004】
【発明が解決しようとする課題】
しかし、こうした対応は、設計面での制約が多く、また、緩衝部分を余分に作る必要があり、軸方向長さが長くなり、無駄が多く、製品品質のばらつきも大きい。また、中空穴にスプライン加工等を施した後、かしめるのでスプライン穴と軸受との同心精度が悪くなるおそれがあった。また、組立前の保管中や、加工中等での外傷等の問題があった。また、近年、燃費向上のため車両の軽量化が進み、部品の肉厚はますます薄く、変形しやすいものとなっている。さらに、小型化が求められている。
【0005】
本発明の課題はかかる問題点に鑑みて、中空穴を有する部品をかしめ、あるいは溶接等のような非可逆的に変形され他部品と一体に組み立てられたユニット組立品において、中空穴等の変形があっても、ドライブシャフト等の相手部品が容易に挿入結合可能な小型で精度の高いユニット組立品を提供することである。また、かかるユニット組立品の加工方法を提供することである。
【0006】
【課題を解決するための手段】
請求項1に記載の発明においては、中空穴を有する部品がかしめ又は溶接等により非可逆的に変形され他部品と一体に組み立てられたユニット組立品であって、前記中空穴を有する部品の前記非可逆的変形に伴う前記中空穴の変形部の全部又は一部を含む中空穴がブローチにより穴加工されているユニット組立品を提供することにより上記課題を解決した。即ち、ユニット組立品の変形された中空穴をブローチでスプライン等の穴加工をしてあるので、かしめ等の変形の影響は取り除かれており、ユニット組立品に対する中空穴の穴加工部分の同心度は精度がよい。また、緩衝部分等の必要もない。なお中空穴はブローチ加工を施す為に貫通されていることは言うまでもない。
【0007】
かかる、ユニット組立品は、自動車用のハブユニットのようなユニット組立品に適している。そこで、請求項2に記載の発明においては、前記ユニット組立品は前記中空穴の有する部品の外周側に複数の玉及び前記複数の玉が転動する外輪を有する軸受ユニットであり、ブローチによる穴加工はスプライン穴加工であるユニット組立品とした。
【0008】
かかるユニット組立品を得るためには、中空穴の穴加工するブローチ加工をユニットとして組立てた後に行うことにより可能である。そこで、請求項3に記載の発明においては、中空穴を有する部品をかしめ又は溶接等により非可逆的に変形させ他部品と一体に組み立てた後、ドライ又は中空穴の加工部に微量ミストをかけて前記中空穴をブローチにより穴加工するユニット組立品のブローチ加工方法を提供するものとした。即ち、かしめ等により変形された中空穴をブローチを用いて穴加工するので、ユニット組立品に対する中空穴の穴加工部の加工精度は高いものとなる。さらに、ドライ又はミスト加工で行うので、既にユニット部品として組み立て完了していても、スプライン穴等の穴加工を行っても、部品、例えば、軸受部に切削油などをかけることなく、また、切り屑などで汚すことなく、軸受部品を初めとする各部品を清浄な状態に保って加工できる。なお、ミスト状の油の量は1時間に2CC〜40CC程度が好ましい。また、このミスト量はブローチ加工に十分なミスト量であるが、2〜3秒程度で終わるブローチ加工中に部品に付着する油はごく微量であり、製品に悪い影響を及ぼすことはない。
【0009】
さらに、請求項4に記載の発明においては、前記中空穴は、前記中空穴を有する部品の前記非可逆的変形に伴う前記中空穴の変形部の全部又は一部含む中空穴とした。これによれば、かしめ等により変形された中空穴の変形部をブローチを用いて穴加工するので、変形部分は削除あるいは成形され、加工精度が向上するばかりでなく加工されるスプライン穴等の加工穴に変形の影響がない。
【0010】
また、請求項5に記載の発明においては、前記ブローチ加工法に使用するブローチは、ねじれ刃溝ブローチとした。これにより、切り屑形状がスパイラル状になり、ブローチポケットにはまりこみにくくなり、切り屑がブローチに残らず、加工時に被加工物の下方に落下しやすくなる。従って、軸受部等への切り屑の侵入等が防止される。
【0011】
また、請求項6に記載の発明においては、前記ブローチ加工速度を10m/min以上で80m/min以下でブローチ加工するようにした。これにより切り屑の回収率がよくなり、ユニット組立品への切削屑等の付着が少なくなる。10m/min未満では切削屑のカール径が小さくブローチの刃溝間に付着し易くなり、戻り時にユニット組立品上に落下するおそれがある。80m/min超ではブローチ盤が大型となり実用的ではないからである。
【0012】
さらに、切削屑を効率的に排除するために、請求項7に記載の発明においては、前記組立ユニットは水平テーブル上にジグを介して前記中空穴が前記水平テーブルに対して垂直となるように載置し、前記ブローチを前記水平テーブルに垂直方向に移動させ前記中空穴を加工するようにされており、前記ジグの下面又はジグ内部に配置した切り屑ブラシと、前記ジグの下方に前記ブローチのブローチ刃に近接しかつ対向して配置した複数個のエアブローノズルと、により、前記ブローチ刃に付着した切り屑を、加工途中または戻し時に除去するようにした。これにより、切り屑はほとんどジグ下方に落下することとなり、ユニット組立品に切り屑が付着することがない。
【0013】
【発明の実施の形態】
以下に本発明の実施の形態について、中空穴を有する部品がかしめ又は溶接等により非可逆的に変形され他部品と一体に組み立てられたユニット組立品の典型的な事例として、自動車のハブユニットに適用した場合について図に基づき説明する。図1は従来の車両用ハブユニットのかしめ前の縦断面図、図2はかしめ後の縦断面図である。図に示す車両用ハブユニット10は、中空の軸状部品14の外側に軸受12を有し、中空穴2にスプライン部14bを有するユニット組立品である。即ち、ハブホイール11およびアンギュラ玉軸受12を備える。ハブホイール11は、図示しない車輪が取り付けられる径方向外向きのフランジ13と、アンギュラ玉軸受12がその外周の軸受嵌合領域に固定される中空軸14とを有する。アンギュラ玉軸受12は、斜接形式の転がり軸受の一種としての復列外向きの形式であって、中空軸14の小径外周面に外嵌される単一軌道を有する内輪15と、二列の軌道溝を有する単一の外輪16と、二列で配設される複数の玉17と、二つの冠形保持器18とを備えており、前述のハブホイール11の中空軸14の大径外周面を一方内輪とする構成になっている。外輪16の外周には、径方向の外向きのフランジ19が設けられている。
【0014】
従来、このようなハブユニット10は、図1の中空軸14の軸端14aが図1の状態から図2の状態に内輪15のかしめ側外端面にかしめられた後、車両のドライブシャフト20を取り付ける。つまり、ハブホイール11の中空軸14がドライブシャフト20にスプライン嵌合されてナット22により結合される。ここで、14bは、中空軸14の内周に形成されたスプライン部であり、これら両スプライン部14b、20aにより前記スプライン嵌合が行われる。しかしながら、前記内輪15のかしめ工程で加えられる加工力により、スプライン部14bが変形し、ドライブシャフト20のとのスプライン嵌合に支障をきたすことがあった。これらのことは前述した通りである。
【0015】
本発明では、かかることのないように、前述した図1の状態では中空穴のスプライン穴14bを加工せず、かしめ後にスプライン穴等を加工するようにしたものである。図3は本発明の工程を示す工程図、図4は本発明のかしめ終了後のユニット組立品の縦断面図、図5は図4のかしめ後のユニット組立品の中空穴のブローチ加工状態を示す縦断面図である。なお、前述したと同様な部分については同符号を付し説明を省略する。本発明の実施の形態においては、図3に示すように、ハブホーイール34の部品加工段階で、中空軸14のスプライン14bを未加工状態として、組立を行い、内輪15のかしめを行う。この段階では、図4に示すように、ハブユニット1の組立、内輪15のかしめが終わり、中空軸14の中空穴2のスプライン穴14bが未加工の状態となる。また、中空穴2内にかしめによる変形が発生する。その後、中空穴2にスプライン穴14bのブローチ加工を行い、その後に、ドライブシャフトの組み付けを行う工程とした。ブローチ加工後にドライブシャフト20等を組付けることで、従来と同じく図2の状態となる。かしめによる変形はブローチ加工により除去または影響がないようにされる。
【0016】
ハブユニット1を組立、かしめるまでは特にゴミ等の影響は少ないが、ブローチ加工を行うと切り屑の発生を伴う。そこで、本発明の実施の形態においては、図5に示すように、使用するブローチは、ねじれ刃溝ブローチ31とし、加工部に1時間当たり10ccのミストをかけ、ブローチ加工速度を30m/minとした。使用するブローチ盤は、水平テーブル36上のブローチ切削位置に設置したワークである中空穴2のブローチ穴14bが未加工のユニット組立品1を取付けるジグ37の下側38又はジグ内部に配置した切り屑ブラシ32と、ジグの下方にブローチ刃に近接しかつ対向して複数個のエアブローノズル33を配置し、切削時に前記ブローチ刃31aに付着した切り屑を、切削途中または戻し時に除去するようにした。また、ブローチ加工時は、ハブホイール34で加工反力を受けるようにし、軸受部12に力が加わらないようにした。
【0017】
かかる構成により、ハブホイールの中空軸14のスプライン部14bはかしめによる変形を受けないため、ドライブシャフト20のとのスプライン嵌合に支障をきたすことがなくなった。また、ねじれ刃溝ブローチ31を用いたので、切り屑形状がスパイラル状になり、ブローチポケットにはまりこみにくくなり、切り屑がブローチに残らず、加工時に被加工物の下方に落下しやすくなる。さらに、切り屑ブラシ32と、エアブローノズルとにより、切り屑はほとんどジグ下方に落下することとなり、ユニット部品に切り屑が付着することがない。また、ミスト加工であり、切削剤が軸受部12にかかることもない。
【0018】
【発明の効果】
以上述べたように本発明においては、かしめ等の非可逆的組立加工の後に、ユニット組立品の変形された後の中空穴をブローチで穴加工し、かしめ等の変形の影響を取り除き、中空穴の穴加工部分の同心度精度がよく、さらに、変形を避けるための緩衝部も不要であるので、相手部品が容易に挿入結合可能な小型で精度の高いユニット組立品を提供するものとなった。また、自動車用のハブユニットのようなユニット組立品に適用でき、加工し易く、小型で量産に適したものとなった。スプライン穴の変形もなく加工歩留まりもよく品質が安定する等の効果を奏する。
【0019】
また、ユニット組立品の加工方法は、中空穴を有する部品を非可逆的に変形させ他部品と一体に組み立てた後、ドライ又は中空穴の加工部に微量ミストをかけて前記中空穴をブローチにより穴加工し、切削油や切り屑などの付着のない清浄な状態に保って容易に加工できるので、従来の加工機械が利用でき、また、スプライン穴等の変形もなく、部品精度も高く、さらに、切り屑や切削油剤などで製品を汚すことなく加工することができ、後工程での処理が簡単である等の効果を奏するものとなった。
【図面の簡単な説明】
【図1】従来の車両用ハブユニットのかしめ前の縦断面図である。
【図2】従来の車両用ハブユニットのかしめ後の縦断面図である。
【図3】本発明の実施の形態である組立加工程を示す工程図である。
【図4】本発明の実施の形態を示すかしめ終了後のユニット組立品の縦断面図である。
【図5】本発明の実施の形態を示すかしめ後のユニット組立品の中空穴のブローチ加工状態を示す縦断面図である。
【符号の説明】
1  ユニット組立品(ハブユニット)
2  中空穴
12 軸受ユニット
14 中空穴を有する部品
14b 加工穴(スプライン穴)
16  外輪
17 玉
31 ブローチ
31a ブローチ刃
32 切り屑ブラシ
33 エアーノズル
36 水平テーブル
37 ジグ
38 ジグの下面又は内部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a unit assembly having a hollow hole typified by a unit assembly such as an automobile hub unit having a bearing outside a hollow shaft-shaped part, and a broaching method thereof.
[Prior art]
A unit assembly such as an automobile hub unit having a bearing on the outside of a hollow shaft-shaped part and having a spline portion in a hollow hole (through hole) is, for example, as shown in FIG. A rolling bearing 12 is mounted on the outer periphery of the shaft, and the shaft end of the shaft is radially outwardly bulged and deformed by rolling caulking to form a caulking portion 14a. The caulking portion is caulked to the end face of the bearing inner ring 15 by the caulking portion. Preload and retaining are performed on 12. A hollow hole 2 having an involute spline hole 14a into which the drive shaft 20 is inserted by spline coupling is provided on a drive wheel shaft of the hub unit 10. The involute spline hole 14a may be deformed by a caulking force applied in an assembling process, and there is a problem that a mating part such as a drive shaft cannot be fitted. Furthermore, caulking is an irreversible deformation, and the deformed material does not return to its original state even if the caulking is removed, and is often difficult to rework and cannot be used as a product. Therefore, a buffer portion is provided between the spline forming portion and the caulking portion of the hollow hole of the hub unit to reduce the deformation of the spline from the viewpoint of product design (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-29210 (FIGS. 2 and 5)
[0004]
[Problems to be solved by the invention]
However, such measures have many restrictions in terms of design, require an extra buffer portion, increase the length in the axial direction, increase waste, and greatly vary product quality. Further, since the hollow hole is subjected to spline processing or the like and then caulked, there is a possibility that the concentric accuracy between the spline hole and the bearing may be deteriorated. In addition, there are problems such as external damage during storage before assembling or during processing. In recent years, the weight of vehicles has been reduced in order to improve fuel efficiency, and the thickness of parts has become thinner and more easily deformable. Furthermore, miniaturization is required.
[0005]
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to caulk a part having a hollow hole, or to deform a hollow hole or the like in a unit assembly that is irreversibly deformed such as welding and assembled integrally with another part. It is an object of the present invention to provide a small and highly accurate unit assembly into which a mating component such as a drive shaft can be easily inserted and coupled. Another object of the present invention is to provide a method of processing such a unit assembly.
[0006]
[Means for Solving the Problems]
In the invention according to claim 1, the component having the hollow hole is a unit assembly that is irreversibly deformed by caulking or welding and is assembled integrally with another component, and the component having the hollow hole is The object has been achieved by providing a unit assembly in which a hollow hole including all or a part of a deformed portion of the hollow hole due to irreversible deformation is processed by a broach. That is, since the deformed hollow hole of the unit assembly is processed by a broach with a hole such as a spline, the influence of deformation such as caulking is removed, and the concentricity of the hole processed portion of the hollow hole with respect to the unit assembly is removed. Is accurate. Also, there is no need for a buffer portion or the like. It goes without saying that the hollow hole is penetrated for performing broaching.
[0007]
Such a unit assembly is suitable for a unit assembly such as a hub unit for an automobile. Therefore, in the invention according to claim 2, the unit assembly is a bearing unit having a plurality of balls and an outer ring on which the plurality of balls roll on the outer peripheral side of the component having the hollow hole, and a hole formed by a broach. The processing was a unit assembly that was a spline hole processing.
[0008]
In order to obtain such a unit assembly, it is possible to perform broaching for forming a hollow hole after assembling the unit. Therefore, in the invention according to claim 3, after irreversibly deforming a component having a hollow hole by caulking or welding and assembling it with another component, a small amount of mist is applied to a dry or hollow hole processed portion. Accordingly, the present invention provides a broaching method for a unit assembly in which the hollow hole is bored by a broach. That is, since the hollow hole deformed by caulking or the like is drilled using a broach, the processing accuracy of the hole drilled portion of the hollow hole with respect to the unit assembly is high. Furthermore, since it is performed by dry or mist processing, even if it has already been assembled as a unit part, even if drilling such as spline holes, it does not apply cutting oil etc. Each component such as a bearing component can be processed in a clean state without being stained with debris. The amount of the mist oil is preferably about 2 CC to 40 CC per hour. Although the amount of mist is sufficient for broaching, the amount of oil adhering to the parts during broaching which is completed in about 2 to 3 seconds is very small and does not adversely affect the product.
[0009]
Further, in the invention described in claim 4, the hollow hole is a hollow hole including all or a part of a deformed portion of the hollow hole accompanying the irreversible deformation of a component having the hollow hole. According to this, since the deformed portion of the hollow hole deformed by caulking or the like is drilled using a broach, the deformed portion is deleted or molded, not only improving the processing accuracy but also processing the spline hole etc. which is processed. The hole is not affected by deformation.
[0010]
Further, in the invention described in claim 5, the broach used in the broaching method is a torsion blade groove broach. Thereby, the chip shape becomes spiral, the chip is hardly stuck in the broach pocket, and the chip does not remain on the broach, and easily falls below the workpiece during processing. Therefore, intrusion of chips into the bearing portion and the like is prevented.
[0011]
In the invention described in claim 6, the broaching is performed at a broaching speed of 10 m / min or more and 80 m / min or less. As a result, the recovery rate of the chips is improved, and the adhesion of the chips to the unit assembly is reduced. If it is less than 10 m / min, the curl diameter of the cutting chips is small, so that the chips tend to adhere between the blade grooves of the broach, and may fall onto the unit assembly when returning. If it exceeds 80 m / min, the broaching machine becomes large and not practical.
[0012]
Further, in order to efficiently remove cutting chips, in the invention according to claim 7, the assembling unit is arranged such that the hollow hole is perpendicular to the horizontal table via a jig on a horizontal table. A cutting brush arranged on the lower surface of the jig or inside the jig by placing the broach vertically on the horizontal table to move the broach, and the broach below the jig. A plurality of air blow nozzles arranged close to and opposed to the broach blade described above remove chips attached to the broach blade during processing or when returning. As a result, the chips almost fall below the jig, and the chips do not adhere to the unit assembly.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, with respect to an embodiment of the present invention, as a typical example of a unit assembly in which a part having a hollow hole is irreversibly deformed by caulking or welding and assembled integrally with another part, a hub unit of an automobile is used. The case of application will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a conventional vehicle hub unit before caulking, and FIG. 2 is a longitudinal sectional view after caulking. The vehicle hub unit 10 shown in the figure is a unit assembly having a bearing 12 outside a hollow shaft-shaped component 14 and having a spline portion 14b in a hollow hole 2. That is, a hub wheel 11 and an angular ball bearing 12 are provided. The hub wheel 11 has a radially outward flange 13 to which a wheel (not shown) is attached, and a hollow shaft 14 to which an angular ball bearing 12 is fixed in a bearing fitting region on an outer periphery thereof. The angular contact ball bearing 12 is of a back row outward direction as a kind of oblique contact type rolling bearing, and has an inner ring 15 having a single track fitted onto the small diameter outer peripheral surface of the hollow shaft 14, and two rows of the inner ring 15. A single outer race 16 having a raceway groove, a plurality of balls 17 arranged in two rows, and two crown retainers 18 are provided. The surface is configured as one inner ring. A radially outward flange 19 is provided on the outer periphery of the outer ring 16.
[0014]
Conventionally, such a hub unit 10 is configured such that after the shaft end 14a of the hollow shaft 14 in FIG. 1 is swaged from the state of FIG. 1 to the state of FIG. Attach. That is, the hollow shaft 14 of the hub wheel 11 is spline-fitted to the drive shaft 20 and connected by the nut 22. Here, 14b is a spline portion formed on the inner periphery of the hollow shaft 14, and the spline fitting is performed by the two spline portions 14b and 20a. However, the spline portion 14b may be deformed due to the processing force applied in the caulking process of the inner ring 15, which may hinder the spline fitting with the drive shaft 20. These are as described above.
[0015]
In the present invention, the spline hole 14b of the hollow hole is not machined in the above-described state of FIG. 3 is a process diagram showing the process of the present invention, FIG. 4 is a longitudinal sectional view of the unit assembly after the caulking of the present invention is completed, and FIG. 5 is a broaching state of the hollow hole of the unit assembly after caulking in FIG. FIG. The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted. In the embodiment of the present invention, as shown in FIG. 3, at the stage of processing the components of the hub wheel 34, the spline 14 b of the hollow shaft 14 is set in an unprocessed state, and the inner ring 15 is caulked. At this stage, as shown in FIG. 4, the assembling of the hub unit 1 and the caulking of the inner race 15 are completed, and the spline holes 14b of the hollow holes 2 of the hollow shaft 14 are unprocessed. In addition, deformation due to caulking occurs in the hollow hole 2. Thereafter, the hollow hole 2 was subjected to broaching of the spline hole 14b, and thereafter, a process of assembling the drive shaft was performed. By attaching the drive shaft 20 and the like after broaching, the state shown in FIG. Deformation due to swaging is removed or left unaffected by broaching.
[0016]
Until the hub unit 1 is assembled and caulked, the influence of dust and the like is particularly small, but when broaching is performed, chips are generated. Therefore, in the embodiment of the present invention, as shown in FIG. 5, a broach to be used is a torsion blade groove broach 31, a mist of 10 cc per hour is applied to a processing portion, and a broaching speed is 30 m / min. did. The broaching machine to be used is a cutting machine in which the broaching hole 14b of the hollow hole 2, which is a work placed at the broaching cutting position on the horizontal table 36, is disposed on the lower side 38 of the jig 37 for mounting the unprocessed unit assembly 1 or inside the jig. A plurality of air blow nozzles 33 are disposed below and below the jig, adjacent to and opposed to the broach blade so that chips attached to the broach blade 31a during cutting are removed during cutting or when returning. did. Further, at the time of broaching, the processing reaction force is received by the hub wheel 34 so that no force is applied to the bearing portion 12.
[0017]
With this configuration, the spline portion 14b of the hollow shaft 14 of the hub wheel is not deformed by caulking, so that the spline fitting with the drive shaft 20 is not hindered. Further, since the torsion blade groove broach 31 is used, the shape of the chips becomes spiral, and the chips are less likely to be stuck in the broach pockets, and the chips do not remain on the broach and easily fall below the workpiece during processing. Further, the chip is almost dropped below the jig by the chip brush 32 and the air blow nozzle, so that the chip does not adhere to the unit components. Moreover, since it is mist processing, a cutting agent does not splash on the bearing portion 12.
[0018]
【The invention's effect】
As described above, in the present invention, after irreversible assembling such as caulking, the deformed hollow hole of the unit assembly is drilled with a broach to remove the influence of deformation such as caulking, and the hollow hole is removed. Since the concentricity accuracy of the hole processing part is good, and a buffer part for avoiding deformation is not required, a small and highly accurate unit assembly that can easily insert and couple a mating part has been provided. . Further, it can be applied to a unit assembly such as a hub unit for an automobile, is easily processed, is small, and is suitable for mass production. There is an effect that there is no deformation of the spline hole, the processing yield is good, and the quality is stable.
[0019]
Further, the processing method of the unit assembly is such that after irreversibly deforming a part having a hollow hole and assembling it integrally with another part, a small amount of mist is applied to a processing part of the dry or hollow hole, and the hollow hole is broached. Since it can be easily machined by drilling holes and keeping it in a clean state free of cutting oil and chips, conventional processing machines can be used, there is no deformation of spline holes, etc. In addition, it is possible to process the product without contaminating the product with chips, cutting oil, or the like.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a conventional vehicle hub unit before caulking.
FIG. 2 is a longitudinal sectional view after caulking a conventional vehicle hub unit.
FIG. 3 is a process diagram showing an assembly process according to an embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of the unit assembly after the completion of caulking according to the embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing a broaching state of a hollow hole of the unit assembly after caulking according to the embodiment of the present invention.
[Explanation of symbols]
1 Unit assembly (hub unit)
2 Hollow hole 12 Bearing unit 14 Component with hollow hole 14b Machined hole (spline hole)
16 Outer ring 17 Ball 31 Broach 31a Broach blade 32 Chip brush 33 Air nozzle 36 Horizontal table 37 Jig 38 Lower surface or inside of jig

Claims (7)

中空穴を有する部品がかしめ又は溶接等により非可逆的に変形され他部品と一体に組み立てられたユニット組立品であって、前記中空穴を有する部品の前記非可逆的変形に伴う前記中空穴の変形部の全部又は一部を含む中空穴がブローチにより穴加工されていることを特徴とするユニット組立品。A unit assembly in which a component having a hollow hole is irreversibly deformed by caulking or welding or the like and integrally assembled with another component, and wherein the hollow hole associated with the irreversible deformation of the component having the hollow hole is provided. A unit assembly, wherein a hollow hole including all or a part of a deformed portion is formed by a broach. 前記ユニット組立品は前記中空穴の有する部品の外周側に複数の玉及び前記複数の玉が転動する外輪を有する軸受ユニットであり、ブローチによる穴加工はスプライン穴加工であることを特徴とする請求項1に記載のユニット組立品。The unit assembly is a bearing unit having a plurality of balls and an outer ring on which the plurality of balls roll on the outer peripheral side of the component having the hollow hole, and the boring is spline drilling. The unit assembly according to claim 1. 中空穴を有する部品をかしめ又は溶接等により非可逆的に変形させ他部品と一体に組み立てた後、ドライ又は中空穴の加工部に微量ミストをかけて前記中空穴をブローチにより穴加工することを特徴とするユニット組立品のブローチ加工方法。After irreversibly deforming a part having a hollow hole by caulking or welding and assembling it integrally with another part, a small amount of mist is applied to a dry or hollow hole processing part to form a hole with a broach. A featured broaching method for unit assemblies. 前記中空穴は、前記中空穴を有する部品の前記非可逆的変形に伴う前記中空穴の変形部の全部又は一部含む中空穴であることを特徴とする請求項3に記載のユニット組立品のブローチ加工方法。4. The unit assembly according to claim 3, wherein the hollow hole is a hollow hole including all or a part of a deformed portion of the hollow hole accompanying the irreversible deformation of a component having the hollow hole. Brooch processing method. 前記ブローチ加工法に使用するブローチは、ねじれ刃溝ブローチであることを特徴とする請求項3又は4に記載のユニット組立品のブローチ加工方法。The broaching method for a unit assembly according to claim 3 or 4, wherein the broach used in the broaching method is a torsion blade groove broach. 前記ブローチ加工速度が10m/min以上で80m/min以下でブローチ加工することを特徴とする請求項3乃至5のいずれか一に記載のユニット組立品のブローチ加工方法。The broaching method for a unit assembly according to any one of claims 3 to 5, wherein the broaching is performed at a broaching speed of 10 m / min or more and 80 m / min or less. 前記組立ユニットは水平テーブル上にジグを介して前記中空穴が前記水平テーブルに対して垂直となるように載置し、前記ブローチを前記水平テーブルに垂直方向に移動させ前記中空穴を加工するようにされており、前記ジグの下面又はジグ内部に配置した切り屑ブラシと、前記ジグの下方に前記ブローチのブローチ刃に近接しかつ対向して配置した複数個のエアブローノズルと、により、前記ブローチ刃に付着した切り屑を、加工途中または戻し時に除去するようにしたことを特徴とする請求項3乃至6のいずれか一に記載のユニット組立品のブローチ加工方法。The assembling unit is mounted on a horizontal table via a jig so that the hollow hole is perpendicular to the horizontal table, and moves the broach vertically to the horizontal table to process the hollow hole. A cutting brush arranged on the lower surface of the jig or inside the jig, and a plurality of air blow nozzles arranged below and below the jig, close to and facing the broach blade of the broach, 7. The method for broaching a unit assembly according to claim 3, wherein chips attached to the blade are removed during the processing or when returning.
JP2002294180A 2002-10-07 2002-10-07 Unit assembly and its broaching method Pending JP2004122345A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281374A (en) * 2009-06-04 2010-12-16 Kayaba Ind Co Ltd Valve device
JP2013100091A (en) * 2012-11-22 2013-05-23 Ntn Corp Bearing device for wheel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010281374A (en) * 2009-06-04 2010-12-16 Kayaba Ind Co Ltd Valve device
JP2013100091A (en) * 2012-11-22 2013-05-23 Ntn Corp Bearing device for wheel

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