JP2009192015A - Bearing unit, bonding method of bearing - Google Patents

Bearing unit, bonding method of bearing Download PDF

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JP2009192015A
JP2009192015A JP2008034844A JP2008034844A JP2009192015A JP 2009192015 A JP2009192015 A JP 2009192015A JP 2008034844 A JP2008034844 A JP 2008034844A JP 2008034844 A JP2008034844 A JP 2008034844A JP 2009192015 A JP2009192015 A JP 2009192015A
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Prior art keywords
bearing
anaerobic adhesive
shaft
fixed
housing
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Naoto Horiuchi
直人 堀内
Seizo Miyazaki
晴三 宮崎
Takayuki Yabe
貴之 矢部
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • 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
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/30—Material joints
    • F16C2226/40—Material joints with adhesive
    • 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
    • F16C2370/00—Apparatus relating to physics, e.g. instruments
    • F16C2370/12—Hard disk drives or the like

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bonding method of a bearing in assembling a bearing unit, which completely cures anaerobic adhesive after applying the anaerobic adhesive and temporarily bonding the bearing on a member to be fixed in an atmospheric environment. <P>SOLUTION: The bearing 2 bonding method for fixing the bearing on a member S to be fixed with the anaerobic adhesive includes: a first process for applying the anaerobic adhesive on the member or the bearing and mounting the bearing on the member under an atmosphere of a room temperature atmospheric environment; a second process for completely curing a non-cured part of the anaerobic adhesive by changing atmospheres of the bearing and the member to be fixed from the room temperature atmospheric environment to a vacuum environment the temperature of which is set higher than a room temperature, and leaving the bearing and the member in the vacuum environment in the state where the anaerobic adhesive applied on the member or the bearing is not completely cured and a part of it remains as a non-cured part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば、磁気ディスク装置(ハードディスクドライブ(以下、ＨＤＤという))のスイングアームを支持するための軸受ユニット(いわゆるピボット軸受ユニット)の組立てに関し、特に、ユニットを構成する軸受を軸及びハウジングに固定する際の接着方法の改良に関する。   The present invention relates to assembling a bearing unit (so-called pivot bearing unit) for supporting a swing arm of a magnetic disk device (hard disk drive (hereinafter referred to as HDD)), and more particularly to a shaft and a housing that constitute the unit. It is related with the improvement of the adhesion method at the time of fixing to.

一般的に、パーソナルコンピュータや各種携帯用端末などに搭載されるＨＤＤは、情報(データ)を記録する磁気ディスク(ハードディスク)と、当該ハードディスクを回転させるスピンドルモータと、先端部に磁気ヘッドが取り付けられたスイングアームとを備えており、当該スイングアームを回動させ、磁気ヘッドをハードディスク上でトレースさせることで、当該ハードディスクへデータを書き込むとともに、当該ハードディスクからデータを読み込んでいる。   Generally, HDDs installed in personal computers and various portable terminals have a magnetic disk (hard disk) that records information (data), a spindle motor that rotates the hard disk, and a magnetic head attached to the tip. A swing arm is provided, and by rotating the swing arm and tracing the magnetic head on the hard disk, data is written to the hard disk and data is read from the hard disk.

その際、かかるスイングアームは、複数の転がり軸受を所定の軸及びハウジング(スリーブ)の間に介在させて構成される軸受ユニット(いわゆるピボット軸受ユニット)によって回動自在に支持されている。
通常、ピボット軸受ユニットにおいては、各軸受の内輪が軸に対して接着固定されるとともに、当該各軸受の外輪がハウジング(スリーブ)に対して接着固定されることで、ユニットが組み立てられている。このような接着固定を行うに当たっては、従来から各種の接着方法が知られている。 At this time, the swing arm is rotatably supported by a bearing unit (so-called pivot bearing unit) configured by interposing a plurality of rolling bearings between a predetermined shaft and a housing (sleeve).
Normally, in a pivot bearing unit, the inner ring of each bearing is bonded and fixed to a shaft, and the outer ring of each bearing is bonded and fixed to a housing (sleeve) to assemble the unit. In performing such adhesive fixing, various bonding methods have been known.

例えば、特許文献１には、軸受の内輪と軸(シャフト)、及び当該軸受の外輪とハウジング(スリーブ)をそれぞれ高ガラス転移点の紫外線硬化型の嫌気性接着剤を用いて接着固定する方法が開示されている。なお、嫌気性接着剤としては、メタクリル酸ジエステルを主成分とし、ヒドロキシアルキルメタアクリレート、アクリル酸ダイマー、有機ハイドロオキサイド、光合成開始剤を含むものを想定している。   For example, Patent Document 1 discloses a method in which an inner ring and a shaft (shaft) of a bearing, and an outer ring and a housing (sleeve) of the bearing are bonded and fixed using an ultraviolet curable anaerobic adhesive having a high glass transition point. It is disclosed. In addition, as an anaerobic adhesive agent, what has methacrylic acid diester as a main component and contains a hydroxyalkyl methacrylate, an acrylic acid dimer, an organic hydroxide, and a photosynthesis initiator is assumed.

この場合、酸素が存在しない雰囲気(すなわち、高度の真空環境)において、軸受を治具によって保持するとともに、当該軸受の内輪と軸(シャフト)、及び外輪とハウジング(スリーブ)の所定箇所に前記嫌気性接着剤を塗布又は注入し、当該接着剤を硬化させている。これにより、接着時におけるアウトガスの発生を抑制しているとともに、かかる接着方法によってユニットを組み立てることで、温度変化に対する寸法変移の小さいピボット軸受ユニット(ピボットアッシー)を実現している。なお、余剰の接着剤は、紫外線を照射して硬化させている。
特開平１０−３１８２５５号公報 In this case, in an atmosphere in which oxygen does not exist (that is, a high vacuum environment), the bearing is held by a jig, and the anaerobic portion is provided at predetermined positions of the inner ring and shaft (shaft) and the outer ring and housing (sleeve) of the bearing. The adhesive is applied or injected to cure the adhesive. As a result, the generation of outgas at the time of bonding is suppressed, and the unit is assembled by such a bonding method, thereby realizing a pivot bearing unit (pivot assembly) having a small dimensional change with respect to temperature change. The surplus adhesive is cured by irradiating with ultraviolet rays.
Japanese Patent Laid-Open No. 10-318255

しかしながら、真空環境下で接着剤を所定箇所に塗布又は注入するには、特殊な装置が必要となるため、広く汎用的にかかる方法を実施するには限界があり、ピボット軸受ユニットの製造コストの上昇を招くという問題がある。また、所定の真空環境を維持すべく、真空中への軸受の出し入れも慎重に行わなければならず、当該出し入れに時間を要するため、作業効率が非常に悪いという問題がある。これらは、ピボット軸受ユニットを量産する場合に顕著となり、軽視することができない問題となっている。   However, a special device is required to apply or inject the adhesive to a predetermined place in a vacuum environment, so there is a limit to implementing such a method widely and widely, and the manufacturing cost of the pivot bearing unit is low. There is a problem of causing an increase. Further, in order to maintain a predetermined vacuum environment, the bearings must be carefully put in and out of the vacuum, and it takes time to take in and out the bearings. These become prominent when the pivot bearing unit is mass-produced, and cannot be neglected.

本発明は、このような課題を解決するためになされており、その目的は、大気環境下で嫌気性接着剤を塗布して軸受を被固定部材(例えば、軸及びハウジング(スリーブ))に対して仮接着させた後、嫌気性接着剤を完全硬化させることが可能な軸受ユニット(例えば、ピボット軸受ユニット)の組立て時における軸受の接着方法を提供することにある。   The present invention has been made in order to solve such problems, and its purpose is to apply an anaerobic adhesive in an atmospheric environment to fix the bearing to a member to be fixed (for example, a shaft and a housing (sleeve)). Another object of the present invention is to provide a method for bonding a bearing at the time of assembling a bearing unit (for example, a pivot bearing unit) capable of completely curing an anaerobic adhesive after temporary bonding.

このような目的を達成するために、本発明に係る軸受接着方法は、軸受を被固定部材に対して嫌気性接着剤で固定するための全作業工程中に第１の工程と第２の工程を含んでいる。第１の工程では、雰囲気が常温の大気環境下において、被固定部材あるいは軸受に嫌気性接着剤を塗布し、当該被固定部材に当該軸受を装着する。これに対し、第２の工程では、前記被固定部材あるいは軸受に塗布された嫌気性接着剤が完全硬化せず、その一部に未硬化部分を残存させた状態で、前記軸受及び被固定部材の雰囲気を前記常温の大気環境から当該常温よりも高温に設定された真空環境へ変化させ、当該真空環境下に前記軸受及び被固定部材を放置することで、前記嫌気性接着剤の未硬化部分を完全硬化させる。   In order to achieve such an object, the bearing bonding method according to the present invention includes a first step and a second step during all work steps for fixing a bearing to a fixed member with an anaerobic adhesive. Is included. In the first step, an anaerobic adhesive is applied to the member to be fixed or the bearing and the bearing is attached to the member to be fixed in an atmospheric environment having a normal temperature. On the other hand, in the second step, the anaerobic adhesive applied to the fixed member or the bearing is not completely cured, and an uncured portion remains in a part of the bearing and the fixed member. The atmosphere is changed from the ambient temperature environment to a vacuum environment set to a temperature higher than the ambient temperature, and the bearing and the fixed member are left in the vacuum environment, whereby the uncured portion of the anaerobic adhesive Is completely cured.

かかる軸受接着方法において、前記真空環境の温度は、６０℃以下に設定すればよい。また、前記真空環境の真空度は、５Ｔｏｒｒ以下に設定すればよい。   In such a bearing bonding method, the temperature of the vacuum environment may be set to 60 ° C. or less. The degree of vacuum in the vacuum environment may be set to 5 Torr or less.

また、上述したような目的を達成するために、本発明に係る軸受ユニットは、ハードディスクドライブのベースプレートに基端部が固定され、当該基端部から所定長さで延出する軸と、当該軸に対してスイングアームを回動自在に支持する複数の軸受と、当該複数の軸受に外装され、スイングアームが取り付けられるハウジングとを備え、各軸受が前記軸及びハウジングに対して嫌気性接着剤でそれぞれ固定されている。かかる軸受ユニットにおいて、前記各軸受は、前記軸及びハウジングに対して上述した軸受接着方法によって固定されている。   In order to achieve the above-described object, a bearing unit according to the present invention includes a shaft having a base end fixed to a base plate of a hard disk drive and extending from the base end by a predetermined length, and the shaft A plurality of bearings that rotatably support the swing arm, and a housing that is externally mounted on the plurality of bearings and to which the swing arm is attached. Each bearing is an anaerobic adhesive with respect to the shaft and the housing. Each is fixed. In such a bearing unit, each of the bearings is fixed to the shaft and the housing by the bearing bonding method described above.

本発明によれば、大気環境下で嫌気性接着剤を塗布して軸受を被固定部材(例えば、軸及びハウジング(スリーブ))に対して仮接着させて組み付けた後、これらの組付体の雰囲気を真空環境に変化させることで、当該真空環境下で嫌気性接着剤を完全硬化させることができる。これにより、軸受ユニット(例えば、ピボット軸受ユニット)の組立て時における軸受の接着を迅速に、かつ低コストに行うことができる。したがって、軸受の接着をかかる方法により行うことで、真空環境下で嫌気性接着剤を塗布するための特殊な装置などは必要なく、軸受ユニット(例えば、ピボット軸受ユニット)の組立コストを低減させることができる。   According to the present invention, after anaerobic adhesive is applied in an atmospheric environment and the bearing is temporarily bonded to a fixed member (for example, a shaft and a housing (sleeve)) and then assembled, By changing the atmosphere to a vacuum environment, the anaerobic adhesive can be completely cured under the vacuum environment. As a result, it is possible to quickly and inexpensively bond the bearings during assembly of the bearing unit (for example, a pivot bearing unit). Therefore, by performing bearing adhesion by such a method, there is no need for a special device for applying anaerobic adhesive in a vacuum environment, and the assembly cost of the bearing unit (for example, pivot bearing unit) can be reduced. Can do.

以下、本発明の一実施形態に係る軸受接着方法について、添付図面を参照して説明する。なお、本発明の軸受接着方法は、軸受が被固定部材に対して嫌気性接着剤で固定されて成る各種の軸受ユニットを組み立てる際に、当該軸受を前記被固定部材に対して接着するための方法として適用することができる。その際、軸受ユニットは各種の軸受装置とすることができ、その種類や態様は特に限定されないが、本実施形態においては、パーソナルコンピュータや各種携帯用端末などに搭載されるＨＤＤのスイングアームを回動自在に支持するためのピボット軸受ユニットを一例として想定する。   Hereinafter, a bearing bonding method according to an embodiment of the present invention will be described with reference to the accompanying drawings. The bearing bonding method of the present invention is a method for bonding the bearing to the fixed member when assembling various bearing units in which the bearing is fixed to the fixed member with an anaerobic adhesive. It can be applied as a method. At that time, the bearing unit can be various types of bearing devices, and the type and form of the bearing unit are not particularly limited. In this embodiment, however, the swing arm of the HDD mounted on a personal computer or various portable terminals is rotated. As an example, a pivot bearing unit for movably supporting is assumed.

また、軸受ユニットの軸受は、当該軸受ユニットの使用条件や使用目的などに応じて任意の構成(大きさ、形状及び数、あるいは材質や動作など)とすることができる。
例えば、内外輪のいずれを回転輪あるいは静止輪としてもよいし、転動体の形状は玉あるいは各種のころ(円錐ころ、円筒ころ及び球面ころなど)であってもよい。また、転動体を保持器で回転自在に保持する構成としてもよく、その際、保持器としては転動体の種類に応じて任意のタイプを適用すればよい。転動体を玉とした場合、波型の合わせタイプや冠型などのタイプを適用することができ、転動体を各種のころとした場合、もみ抜き型、くし型及びかご型などのタイプを適用することができる。また、軸受ユニットの使用条件や使用目的などに応じて、金属製や樹脂製などの内外輪、転動体及び保持器を組み合わせればよい。さらに、必要に応じて所定の密封部材(接触型のシール、あるいは非接触型のシールやシールドなど)を内外輪間に介在させてもよい。 Further, the bearing of the bearing unit can have an arbitrary configuration (size, shape, number, material, operation, etc.) according to the use condition or purpose of use of the bearing unit.
For example, any of the inner and outer rings may be a rotating ring or a stationary ring, and the shape of the rolling element may be a ball or various types of rollers (such as a tapered roller, a cylindrical roller, and a spherical roller). Moreover, it is good also as a structure which hold | maintains a rolling element rotatably with a holder | retainer, What is necessary is just to apply arbitrary types according to the kind of rolling element as a holder | retainer in that case. When rolling elements are balls, corrugated types and crown types can be applied, and when rolling elements are various rollers, types such as machined, comb and cage types are applied. can do. Moreover, what is necessary is just to combine inner and outer rings, rolling elements, and a cage | baskets, such as metal and resin, according to the use conditions of a bearing unit, a use purpose, etc. Furthermore, a predetermined sealing member (a contact type seal or a non-contact type seal or shield) may be interposed between the inner and outer rings as necessary.

ＨＤＤは、情報(データ)を記録する磁気ディスク(ハードディスク)と、当該ハードディスクを回転させるスピンドルモータと、先端部に磁気ヘッドが取り付けられたスイングアームとを備えており、当該スイングアームを回動させ、磁気ヘッドをハードディスク上でトレースさせることで、当該ハードディスクへデータを書き込むとともに、当該ハードディスクからデータを読み込んでいる。   The HDD includes a magnetic disk (hard disk) for recording information (data), a spindle motor for rotating the hard disk, and a swing arm with a magnetic head attached to the tip, and the swing arm is rotated. By tracing the magnetic head on the hard disk, data is written to the hard disk and data is read from the hard disk.

ピボット軸受ユニットは、複数の転がり軸受を所定の軸及びハウジング(スリーブ)の間に介在させた構造となっており、各軸受の内輪が軸に対して位置決め固定されているとともに、当該各軸受の外輪がハウジング(スリーブ)に対して位置決め固定されている。この場合、前記軸は、ＨＤＤのベースプレートに基端部が固定され、当該基端部から所定長さで延出されている。このような構成を成す本実施形態に係るピボット軸受ユニットの組立てにおいては、前記各軸受の内輪を前記軸に対して固定する際、並びに当該各軸受の外輪をハウジング(スリーブ)に対して固定する際に、いずれも本発明の軸受接着方法が用いられている。   The pivot bearing unit has a structure in which a plurality of rolling bearings are interposed between a predetermined shaft and a housing (sleeve), and the inner ring of each bearing is positioned and fixed with respect to the shaft. The outer ring is positioned and fixed with respect to the housing (sleeve). In this case, a base end portion of the shaft is fixed to the base plate of the HDD, and extends from the base end portion by a predetermined length. In assembling the pivot bearing unit according to the present embodiment having such a configuration, the inner ring of each bearing is fixed to the shaft, and the outer ring of each bearing is fixed to the housing (sleeve). In any case, the bearing bonding method of the present invention is used.

本実施形態において、軸受接着方法には、被固定部材であるピボット軸受ユニットの軸、並びにハウジング(スリーブ)に対してそれぞれ嫌気性接着剤で軸受を固定するための全作業工程中に、第１の工程(以下、第一工程という)と第２の工程(以下、第二工程という)が含まれており、先に第一工程が実施され、引き続いて第二工程が実施されている。   In the present embodiment, the bearing bonding method includes the first operation during the entire work process for fixing the bearing with the anaerobic adhesive to the shaft of the pivot bearing unit as a fixed member and the housing (sleeve). These steps (hereinafter referred to as the first step) and the second step (hereinafter referred to as the second step) are included, the first step is performed first, followed by the second step.

第一工程では、雰囲気が常温の大気環境下において、ピボット軸受ユニットの軸及びハウジング(スリーブ)、あるいは軸受に嫌気性接着剤を塗布し、当該ピボット軸受ユニットの軸及びハウジング(スリーブ)に当該軸受が装着される。なお、軸受をピボット軸受ユニットの軸に対して接着固定させる場合、嫌気性接着剤は、当該軸あるいは軸受のいずれか一方、若しくは双方に塗布すればよいが、本実施形態においては、一例として、軸に対してのみ嫌気性接着剤を塗布している。また、軸受をピボット軸受ユニットのハウジングに対して接着固定させる場合、嫌気性接着剤は、当該ハウジングあるいは軸受のいずれか一方、若しくは双方に塗布すればよいが、本実施形態においては、一例として、軸受に対してのみ嫌気性接着剤を塗布している。   In the first step, an anaerobic adhesive is applied to the shaft and housing (sleeve) of the pivot bearing unit or the bearing in an atmospheric environment of normal temperature, and the bearing is applied to the shaft and housing (sleeve) of the pivot bearing unit. Is installed. When the bearing is bonded and fixed to the shaft of the pivot bearing unit, the anaerobic adhesive may be applied to either the shaft or the bearing, or both, but in the present embodiment, as an example, An anaerobic adhesive is applied only to the shaft. Further, when the bearing is bonded and fixed to the housing of the pivot bearing unit, the anaerobic adhesive may be applied to either the housing or the bearing, or both, but in this embodiment, as an example, An anaerobic adhesive is applied only to the bearing.

図１(ａ),(ｂ)には、軸受２(具体的には、その内輪２ａ)をピボット軸受ユニットの軸Ｓに対して接着固定させる方法の一例が示されており、この場合、嫌気性接着剤は、充填器(図示しない)に充填され、当該充填器に接続されたノズル４から軸Ｓの外周面Ｓａに向けて噴出され、当該外周面Ｓａに塗布されている。その際、ノズル４は、その吐出口４ａが所定位置に静止するように配設されているのに対し、軸Ｓは、所定の回転軸Ｃを中心に回転可能な軸ホルダ６に保持され、当該軸ホルダ６の回転に伴って同一の回転軸Ｃを中心に回転している。   FIGS. 1A and 1B show an example of a method for adhering and fixing the bearing 2 (specifically, its inner ring 2a) to the shaft S of the pivot bearing unit. The adhesive is filled in a filling device (not shown), ejected from the nozzle 4 connected to the filling device toward the outer peripheral surface Sa of the shaft S, and applied to the outer peripheral surface Sa. At that time, the nozzle 4 is disposed such that its discharge port 4a is stationary at a predetermined position, whereas the shaft S is held by a shaft holder 6 that can rotate around a predetermined rotation axis C. As the shaft holder 6 rotates, it rotates about the same rotation axis C.

これにより、ノズル４の吐出口４ａから嫌気性接着剤を一定に吐出させることで、軸Ｓの外周面Ｓａに対してムラなく均一に当該嫌気性接着剤を塗布することができる(図１(ａ)に示す領域Ａ１の状態)。この場合、ノズル４は、軸Ｓに対する軸受２の接着位置に合わせて吐出口４ａから嫌気性接着剤が吐出可能となるように、その配設位置を設定すればよい。また、軸Ｓの外周面Ｓａに対する嫌気性接着剤の塗布領域は、軸受２の内輪２ａの内周面よりも小さな領域、例えば、当該内周面の軸方向寸法(図１(ｂ)の上下方向の距離)よりも小さな幅寸法の領域となるように設定すればよい(図１(ａ),(ｂ)に示す領域A1,A2参照)。   Thereby, the anaerobic adhesive can be uniformly applied to the outer peripheral surface Sa of the shaft S uniformly by discharging the anaerobic adhesive from the discharge port 4a of the nozzle 4 (FIG. 1). State of area A1 shown in a)). In this case, the arrangement position of the nozzle 4 may be set so that the anaerobic adhesive can be discharged from the discharge port 4a in accordance with the bonding position of the bearing 2 with respect to the shaft S. In addition, the application region of the anaerobic adhesive to the outer peripheral surface Sa of the shaft S is smaller than the inner peripheral surface of the inner ring 2a of the bearing 2, for example, the axial dimension of the inner peripheral surface (the upper and lower dimensions in FIG. What is necessary is just to set so that it may become an area | region of a width dimension smaller than the distance of a direction (refer area | region A1, A2 shown to FIG. 1 (a), (b)).

したがって、軸Ｓに対して軸受２(具体的には、その内輪２ａ)を挿入して組み付けた際、軸Ｓの外周面Ｓａに塗布された嫌気性接着剤が押し広げられ、その塗布領域は、図１(ａ)に示す領域Ａ１から同図(ｂ)に示す領域Ａ２(すなわち、内輪２ａの内周面全体がカバーされる領域)に拡張される。これにより、軸受２を接着固定するために必要最小限の量だけ、嫌気性接着剤を軸Ｓの外周面Ｓａ(別の捉え方をすれば、軸受２の内輪２ａの内周面全体)に対してより薄く塗布させることができる。   Therefore, when the bearing 2 (specifically, the inner ring 2a) is inserted into the shaft S and assembled, the anaerobic adhesive applied to the outer peripheral surface Sa of the shaft S is spread, and the application area is as follows. The area A1 shown in FIG. 1 (a) is expanded to the area A2 shown in FIG. 1 (b) (that is, an area covering the entire inner peripheral surface of the inner ring 2a). Thus, anaerobic adhesive is applied to the outer peripheral surface Sa of the shaft S by the minimum amount necessary for adhesively fixing the bearing 2 (in other words, the entire inner peripheral surface of the inner ring 2a of the bearing 2). On the other hand, it can be applied thinner.

次いで、吐出口４ａが軸受２の外輪２ｂの外周面に向けて位置付けられるようにノズル４の位置を移動させ、当該吐出口４ａから嫌気性接着剤を一定に吐出させることで、軸受２の外輪２ｂの外周面に対してムラなく均一に当該嫌気性接着剤を塗布することができる。なお、その際、外輪２ｂの外周面に対する嫌気性接着剤の塗布領域は、上述した軸Ｓの外周面Ｓａに対する嫌気性接着剤の塗布領域と同様に、当該外輪２ｂの外周面２ｂよりも小さな領域(すなわち外周面２ｂの全体ではなく、その一部の領域)に設定すればよい。   Next, the position of the nozzle 4 is moved so that the discharge port 4a is positioned toward the outer peripheral surface of the outer ring 2b of the bearing 2, and the anaerobic adhesive is discharged from the discharge port 4a at a constant rate. The anaerobic adhesive can be uniformly applied to the outer peripheral surface of 2b without unevenness. At that time, the application region of the anaerobic adhesive to the outer peripheral surface of the outer ring 2b is smaller than the outer peripheral surface 2b of the outer ring 2b, similarly to the application region of the anaerobic adhesive to the outer peripheral surface Sa of the shaft S described above. What is necessary is just to set to an area | region (namely, not the whole outer peripheral surface 2b but the one part area).

したがって、外周面２ｂに嫌気性接着剤が塗布された軸受２にハウジング(スリーブ(図示しない))を挿入して組み付けることで、当該外周面２ｂに塗布された嫌気性接着剤が押し広げられ、その塗布領域は外輪２ｂの外周面全体がカバーされる領域に拡張される。これにより、軸受２を接着固定するために必要最小限の量だけ、嫌気性接着剤を軸受２の外輪２ｂの外周面全体(別の捉え方をすれば、ハウジング(スリーブ)の軸受接着領域)に対してより薄く塗布させることができる。なお、ハウジング(スリーブ)としては、例えば、円筒状の部材や、断面が環の一部を欠落させたＣ字状を成す筒状部材などを想定している。   Therefore, the anaerobic adhesive applied to the outer peripheral surface 2b is spread by inserting and assembling the housing (sleeve (not shown)) to the bearing 2 having the outer peripheral surface 2b applied with the anaerobic adhesive. The application area is expanded to an area where the entire outer peripheral surface of the outer ring 2b is covered. As a result, the anaerobic adhesive is applied to the entire outer peripheral surface of the outer ring 2b of the bearing 2 by the minimum amount necessary for bonding and fixing the bearing 2 (or, in another way, the bearing bonding area of the housing (sleeve)). Can be applied thinner. As the housing (sleeve), for example, a cylindrical member or a cylindrical member having a C-shaped cross section with a part of the ring omitted is assumed.

また、嫌気性接着剤が外周面Ｓａに塗布された軸Ｓの所定位置(接着位置)に軸受２を挿入するとともに、嫌気性接着剤が外輪２ｂの外周面に塗布された前記軸受２にハウジング(スリーブ)を所定位置(接着位置)まで挿入した状態において、当該軸受２には予圧が付与されている。この場合、軸受２に対して予め設定した大きさ(設定値)の予圧を付与するための予圧セット治具(図示しない)を軸Ｓに取り付け、当該予圧セット治具によって内輪２ａに軸Ｓ方向への荷重を加え、当該荷重を加えた状態のまま軸受２の姿勢を保持する。なお、かかる保持時間は、例えば、軸受２に付与する予圧の大きさや嫌気性接着剤の種類などに応じて任意に設定することができるが、本実施形態においては３０分程度を一例として想定している。   Further, the bearing 2 is inserted into a predetermined position (adhesion position) of the shaft S on which the anaerobic adhesive is applied to the outer peripheral surface Sa, and the housing is attached to the bearing 2 in which the anaerobic adhesive is applied to the outer peripheral surface of the outer ring 2b. In a state where the (sleeve) is inserted to a predetermined position (adhesion position), a preload is applied to the bearing 2. In this case, a preload setting jig (not shown) for applying a preload having a preset size (set value) to the bearing 2 is attached to the shaft S, and the inner ring 2a is attached to the inner ring 2a by the preload setting jig. And the posture of the bearing 2 is maintained with the load applied. The holding time can be arbitrarily set according to, for example, the size of the preload applied to the bearing 2 and the type of anaerobic adhesive, but in this embodiment, about 30 minutes is assumed as an example. ing.

これにより、軸受２に予圧を付与することができるとともに、当該軸受２を軸Ｓの所定位置に仮接着させることができる。なお、仮接着とは、軸Ｓ及び軸受２に塗布された嫌気性接着剤が完全には硬化せず、その一部に未硬化部分を残存させて硬化が開始され、予圧セット治具によって内輪２ａに荷重を加えなくとも軸受２の予圧を設定値に維持可能な状態を示す。   As a result, a preload can be applied to the bearing 2 and the bearing 2 can be temporarily bonded to a predetermined position of the shaft S. The temporary adhesion means that the anaerobic adhesive applied to the shaft S and the bearing 2 is not completely cured, and the uncured portion is left in a part thereof to be cured. The state where the preload of the bearing 2 can be maintained at the set value without applying a load to 2a is shown.

そして、第一工程が実施され、軸受２が上述したような仮接着の状態となった後、引き続いて第二工程が実施される。
第二工程では、軸受２が軸Ｓ及びハウジング(スリーブ)に対して仮接着された状態、すなわち軸Ｓ及び軸受２に塗布された嫌気性接着剤が完全硬化せず、未硬化部分を残存させた状態で、軸受２、軸Ｓ及びハウジング(スリーブ)の組付体(すなわち、ピボット軸受ユニット)の雰囲気を上述した常温の大気環境から当該常温よりも高温に設定された真空環境へ変化させる。 And after a 1st process is implemented and the bearing 2 will be in the state of temporary adhesion as mentioned above, a 2nd process is implemented continuously.
In the second step, the bearing 2 is temporarily bonded to the shaft S and the housing (sleeve), that is, the anaerobic adhesive applied to the shaft S and the bearing 2 is not completely cured, leaving an uncured portion. In this state, the atmosphere of the assembly of the bearing 2, the shaft S and the housing (sleeve) (that is, the pivot bearing unit) is changed from the above-described atmospheric environment to the vacuum environment set to a temperature higher than the ordinary temperature.

この場合、前記真空環境の温度は、常温よりも高い温度であれば、例えば、嫌気性接着剤の種類などに応じて任意に設定することができるが、本実施形態においては、その温度が６０℃以下に設定された真空環境を一例として想定している。また、前記真空環境の真空度も、例えば、嫌気性接着剤の種類などに応じて任意に設定することができるが、本実施形態においては、その真空度が５Ｔｏｒｒ以下に設定された真空環境を一例として想定している。   In this case, if the temperature of the vacuum environment is higher than room temperature, for example, it can be arbitrarily set according to the type of anaerobic adhesive, etc., but in this embodiment, the temperature is 60 As an example, a vacuum environment set at a temperature of ℃ or lower is assumed. Further, the degree of vacuum of the vacuum environment can be arbitrarily set according to, for example, the type of anaerobic adhesive, but in this embodiment, a vacuum environment in which the degree of vacuum is set to 5 Torr or less is used. As an example.

また、本実施形態においては、その内部に軸受２、軸Ｓ及びハウジング(スリーブ)の組付体(すなわち、ピボット軸受ユニット)を格納可能な所定空間を有し、当該空間を上述した真空環境(温度が６０℃以上で、真空度が５Ｔｏｒｒ以下)に設定することが可能な真空槽(図示しない)を用意し、当該真空槽内に仮接着の状態の軸受２を軸Ｓ及びハウジング(スリーブ)とともに格納することで、当該軸受２、軸Ｓ及びハウジング(スリーブ)の雰囲気を上述した常温の大気環境から当該常温よりも高温(６０℃以上)に設定された真空環境へ変化させている。その際には、軸受２に予圧を付与するために軸Ｓに対して取り付けられていた予圧セット治具を軸Ｓから取り外し、軸受２、軸Ｓ及びハウジング(スリーブ)のみを真空槽内に格納させればよい。なお、これらの軸受２、軸Ｓ及びハウジング(スリーブ)を、当該軸Ｓが軸ホルダ６に保持された状態のまま真空槽内に格納させてもよいし、軸Ｓを軸ホルダ６から取り外した状態で、軸受２及びハウジング(スリーブ)とともに真空槽内に格納させてもよい。   Further, in the present embodiment, there is a predetermined space in which the assembly of the bearing 2, the shaft S and the housing (sleeve) (that is, the pivot bearing unit) can be stored, and the space is the above-described vacuum environment ( A vacuum chamber (not shown) that can be set to a temperature of 60 ° C. or higher and a degree of vacuum of 5 Torr or less is prepared, and the shaft 2 and housing (sleeve) are provided with the bearing 2 in a temporarily bonded state in the vacuum chamber. By storing together, the atmosphere of the bearing 2, the shaft S, and the housing (sleeve) is changed from the above-described atmospheric environment to a vacuum environment set to a temperature higher than the ordinary temperature (60 ° C. or higher). At that time, the preload setting jig attached to the shaft S to apply the preload to the bearing 2 is removed from the shaft S, and only the bearing 2, the shaft S and the housing (sleeve) are stored in the vacuum chamber. You can do it. The bearing 2, the shaft S, and the housing (sleeve) may be stored in the vacuum chamber while the shaft S is held by the shaft holder 6, or the shaft S is removed from the shaft holder 6. In a state, it may be stored in the vacuum chamber together with the bearing 2 and the housing (sleeve).

そして、かかる真空環境の真空槽内に格納された軸受２、軸Ｓ及びハウジング(スリーブ)の組付体を所定時間だけ当該真空環境下に放置し、第一工程において残存していた嫌気性接着剤の未硬化部分を硬化させ、当該嫌気性接着剤を完全に硬化させる。なお、軸受２、軸Ｓ及びハウジング(スリーブ)を真空環境下に放置させる時間は、第一工程における未硬化部分だけでなく、軸Ｓの外周面Ｓａやハウジング(スリーブ)の内周面にはみ出した部分も含めて嫌気性接着剤が完全に硬化される時間以上に設定すればよい。したがって、かかる放置時間は、嫌気性接着剤の種類などに応じて具体的に設定されるため、ここでは特に限定しないが、およそ２時間程度に設定すればよい。   Then, the assembly of the bearing 2, the shaft S and the housing (sleeve) stored in the vacuum chamber in such a vacuum environment is left in the vacuum environment for a predetermined time, and the anaerobic adhesion remaining in the first step The uncured portion of the agent is cured, and the anaerobic adhesive is completely cured. Note that the time for which the bearing 2, the shaft S and the housing (sleeve) are allowed to stand in a vacuum environment is not limited to the uncured portion in the first step, but also protrudes to the outer peripheral surface Sa of the shaft S and the inner peripheral surface of the housing (sleeve). What is necessary is just to set more than the time when anaerobic adhesive is completely hardened also including the part. Therefore, since the standing time is specifically set according to the type of anaerobic adhesive, etc., it is not particularly limited here, but it may be set to about 2 hours.

さらに、本実施形態においては、上述した第一工程、及び第二工程に引き続いて、第二工程を経た軸受２、軸Ｓ及びハウジング(スリーブ)、すなわち、完全硬化された嫌気性接着剤によって軸受２が軸Ｓ及びハウジング(スリーブ)へ接着固定されたピボット軸受ユニットに対し、雰囲気が真空環境よりも高温に設定された環境(以下、高温ベーキング環境という)下でガス抜きを実施している(ガス抜き工程)。この場合、高温ベーキング環境の設定温度は、一例として８０℃以上を想定しているが、真空環境の設定温度よりも高温に設定されている限り特に限定されず、当該真空環境の設定温度に応じて任意に設定すればよい。   Further, in the present embodiment, following the first step and the second step described above, the bearing 2, the shaft S and the housing (sleeve) that have undergone the second step, that is, the bearing by the completely hardened anaerobic adhesive. The pivot bearing unit 2 is fixed to the shaft S and the housing (sleeve) by degassing under an environment where the atmosphere is set to a temperature higher than the vacuum environment (hereinafter referred to as a high temperature baking environment) ( Degassing process). In this case, the set temperature of the high temperature baking environment is assumed to be 80 ° C. or more as an example, but is not particularly limited as long as it is set to a temperature higher than the set temperature of the vacuum environment, and depends on the set temperature of the vacuum environment. Can be set arbitrarily.

このように、嫌気性接着剤が完全に硬化された後に高温ベーキング環境下でのガス抜き工程を実施することで、嫌気性接着剤に未硬化部分が残存されている状態で同様のガス抜き工程を実施する場合と比べ、軸Ｓやハウジング(スリーブ)の材料と軸受２の材料に線膨張係数の差があったとしても、嫌気性接着剤の完全硬化後の軸受２の変形が少なく、より高精度のピボット軸受ユニットを組み立てることができる。   In this way, the same degassing step with the uncured part remaining in the anaerobic adhesive by performing the degassing step in a high temperature baking environment after the anaerobic adhesive is completely cured. Compared to the case where the material of the shaft S or housing (sleeve) and the material of the bearing 2 have a difference in linear expansion coefficient, the deformation of the bearing 2 after complete curing of the anaerobic adhesive is less, and more High precision pivot bearing unit can be assembled.

以上、本実施形態に係る軸受接着方法によれば、大気環境下で嫌気性接着剤を塗布して軸受２を被固定部材(例えば、軸Ｓ及びハウジング(スリーブ))に対して仮接着させて組み付けた後、これらの組付体の雰囲気を真空環境に変化させ、当該真空環境下で嫌気性接着剤を完全硬化させることができる。これにより、軸受ユニット(例えば、ピボット軸受ユニット)の組立て時における軸受の接着を迅速に、かつ低コストに行うことができる。
したがって、軸受の接着をかかる方法により行うことで、真空環境下で嫌気性接着剤を塗布するための特殊な装置などは必要なく、軸受ユニット(例えば、ピボット軸受ユニット)の組立コストを低減させることができる。 As described above, according to the bearing bonding method according to the present embodiment, the anaerobic adhesive is applied in the atmospheric environment to temporarily bond the bearing 2 to the fixed member (for example, the shaft S and the housing (sleeve)). After the assembly, the atmosphere of these assemblies can be changed to a vacuum environment, and the anaerobic adhesive can be completely cured under the vacuum environment. As a result, it is possible to quickly and inexpensively bond the bearings during assembly of the bearing unit (for example, a pivot bearing unit).
Therefore, by performing the bonding of the bearing by such a method, there is no need for a special device for applying anaerobic adhesive in a vacuum environment, and the assembly cost of the bearing unit (for example, a pivot bearing unit) can be reduced. Can do.

本発明の一実施形態に係る軸受接着方法を示す図であって、(ａ)は、軸の外周面に嫌気性接着剤を塗布する工程を示す概念図、(ｂ)は、外周面に嫌気性接着剤が塗布された軸に対して軸受を挿入する工程を示す概念図。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the bearing adhesion | attachment method which concerns on one Embodiment of this invention, Comprising: (a) is a conceptual diagram which shows the process of apply | coating anaerobic adhesive to the outer peripheral surface of a axis | shaft, (b) is anaerobic on an outer peripheral surface. The conceptual diagram which shows the process of inserting a bearing with respect to the axis | shaft to which the adhesive was apply | coated.

符号の説明Explanation of symbols

２ 軸受
２ａ 軸受内輪
４ ノズル
４ａ ノズル吐出口
６ 軸ホルダ
Ａ１，Ａ２ 嫌気性接着剤塗布領域
Ｓ 軸
Ｓａ 軸外周面 2 Bearing 2a Bearing inner ring 4 Nozzle 4a Nozzle discharge port 6 Shaft holder A1, A2 Anaerobic adhesive application area S Axis Sa Shaft outer peripheral surface

Claims (4)

軸受を被固定部材に対して嫌気性接着剤で固定するための軸受接着方法であって、
雰囲気が常温の大気環境下において、被固定部材あるいは軸受に嫌気性接着剤を塗布し、当該被固定部材に当該軸受を装着する第１の工程と、
前記被固定部材あるいは軸受に塗布された嫌気性接着剤が完全硬化せず、その一部に未硬化部分を残存させた状態で、前記軸受及び被固定部材の雰囲気を前記常温の大気環境から当該常温よりも高温に設定された真空環境へ変化させ、当該真空環境下に前記軸受及び被固定部材を放置することで、前記嫌気性接着剤の未硬化部分を完全硬化させる第２の工程が含まれることを特徴とする軸受接着方法。 A bearing bonding method for fixing a bearing to a fixed member with an anaerobic adhesive,
A first step of applying an anaerobic adhesive to the member to be fixed or the bearing and mounting the bearing on the member to be fixed;
The anaerobic adhesive applied to the member to be fixed or the bearing is not completely cured, and the atmosphere of the bearing and the member to be fixed is changed from the atmospheric environment at the normal temperature in a state where an uncured part remains in a part thereof. A second step of completely curing the uncured portion of the anaerobic adhesive by changing to a vacuum environment set to a temperature higher than normal temperature and leaving the bearing and the fixed member in the vacuum environment. A method for adhering a bearing. 前記真空環境は、その温度が６０℃以下に設定されていることを特徴とする請求項１に記載の軸受接着方法。   The bearing bonding method according to claim 1, wherein the temperature of the vacuum environment is set to 60 ° C. or less. 前記真空環境は、その真空度が５Ｔｏｒｒ以下に設定されていることを特徴とする請求項２に記載の軸受接着方法。   The bearing adhesion method according to claim 2, wherein the vacuum environment has a degree of vacuum set to 5 Torr or less. ハードディスクドライブのベースプレートに基端部が固定され、当該基端部から所定長さで延出する軸と、当該軸に対してスイングアームを回動自在に支持する複数の軸受と、当該複数の軸受に外装され、スイングアームが取り付けられるハウジングとを備え、各軸受が前記軸及びハウジングに対して嫌気性接着剤でそれぞれ固定された軸受ユニットであって、
前記各軸受は、前記軸及びハウジングに対して請求項１〜３のいずれかに記載の軸受接着方法によって固定されていることを特徴とする軸受ユニット。 A base end portion fixed to a base plate of a hard disk drive, a shaft extending from the base end portion by a predetermined length, a plurality of bearings for rotatably supporting a swing arm with respect to the shaft, and the plurality of bearings And a housing to which a swing arm is attached. Each bearing is fixed to the shaft and the housing with an anaerobic adhesive,
Each said bearing is being fixed with the bearing adhesion | attachment method in any one of Claims 1-3 with respect to the said shaft and a housing.
JP2008034844A 2008-02-15 2008-02-15 Bearing unit, bonding method of bearing Pending JP2009192015A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010004791A1 (en) * 2010-01-16 2011-09-01 Aktiebolaget Skf Method for defining a bearing ring on or in a component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010004791A1 (en) * 2010-01-16 2011-09-01 Aktiebolaget Skf Method for defining a bearing ring on or in a component

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