JPH02280650A - Bearing unit and manufacture thereof - Google Patents
Bearing unit and manufacture thereofInfo
- Publication number
- JPH02280650A JPH02280650A JP10029789A JP10029789A JPH02280650A JP H02280650 A JPH02280650 A JP H02280650A JP 10029789 A JP10029789 A JP 10029789A JP 10029789 A JP10029789 A JP 10029789A JP H02280650 A JPH02280650 A JP H02280650A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- housing
- bearing seat
- seat
- ultrasonic vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims 1
- 230000015556 catabolic process Effects 0.000 abstract 1
- 239000004033 plastic Substances 0.000 description 7
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Landscapes
- Brushless Motors (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は軸受ユニット及びその製造方法に関する。更に
詳述すると本発明は、ハウジングが熱可塑性プラスチッ
クから成る軸受ユニットとその製（従来の技術）
従来、キャプスタンモータの軸受を支えるハウジングは
アルミニウム合金又は亜鉛合金等を材料とするダイキャ
ストによって形成されている。しかし、これらグイキャ
スト製品は生産性が悪い上に重量があり、かつ軸受が納
められる中央貫通孔内を同心度、真直度の寸法精度向上
のための後加工や外観の見栄えをよくしたり取付は用の
ねじをを形成するためめ後加工を行う必要がある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bearing unit and a method for manufacturing the same. More specifically, the present invention relates to a bearing unit whose housing is made of thermoplastic plastic and its manufacture (prior art). Conventionally, the housing supporting the bearing of a capstan motor was formed by die-casting made of aluminum alloy, zinc alloy, or the like. has been done. However, these Guicast products have poor productivity, are heavy, and require post-processing to improve the dimensional accuracy of concentricity and straightness in the central through-hole where the bearing is housed, as well as to improve the appearance and installation. It is necessary to perform post-processing to form a thread for use.
そこで、ハウジングをプラスチック化することによって
生産性を上げると共に加工の手間を省き、軽量化を図る
ことが考えられている（例えば特開昭６２−５８８４９
号）、このプラスチックハウジングの場合、軸受のハウ
ジングへの固定は圧入によって行なわれる。Therefore, it has been considered to increase productivity, reduce processing effort, and reduce weight by making the housing plastic.
In the case of this plastic housing, the bearing is fixed to the housing by press fitting.
（発明が解決しようとする課題）
しかしながら、このプラスチック製ハウジングにおいて
も、固まったプラスチック製ハウジング内に軸受を圧入
するため、軸受の位置や傾き等の精度がハウジングの精
度に左右されることから、寸法精度を確保するため数回
におよぶ金型の改修が必要となる。プラスチック成形で
は、金型の形をどのようにすれば求める精度の成形品が
できるのかを予測できないため、金型の形を少しずつ何
回も変えながら、求める精度の成形品ができるまで金型
を変更しなくてはならない、このため、寸法精度の規格
が厳しい軸受ハウジングにおいてはプラスチック化が難
しい。また、ハウジングをプラスチック化しても、ハウ
ジングへ軸受を圧入する際に、ハウジングが割れたり、
軸受が変形する虞がある。(Problem to be Solved by the Invention) However, even in this plastic housing, since the bearing is press-fitted into the hardened plastic housing, the accuracy of the bearing position, inclination, etc. depends on the accuracy of the housing. In order to ensure dimensional accuracy, the mold needs to be modified several times. In plastic molding, it is impossible to predict how the mold should be shaped to produce a molded product with the desired precision, so the shape of the mold is changed little by little over and over until the desired precision is achieved. Therefore, it is difficult to use plastic for bearing housings that have strict standards for dimensional accuracy. Also, even if the housing is made of plastic, the housing may crack or crack when press-fitting the bearing into the housing.
There is a risk of deformation of the bearing.
本発明は軸受ユニットのハウジングのプラスチック化を
行うことを目的とし、更にはハウジングへの軸受の取付
けを割れや変形をｆｆわずに行な得る軸受ユニット及び
その製造方法を提供することを目的とする。The present invention aims to make the housing of a bearing unit plastic, and further aims to provide a bearing unit and a method for manufacturing the same, in which the bearing can be attached to the housing without cracking or deforming. do.
（課題を解決するための手段）
かかる目的を達成するため、本発明の軸受ユニットは、
軸受座を有する熱可塑性樹脂から成るハウジングと、該
ハウジングの前記軸受座に超音波振動をかけつつ挿入さ
れて固定された軸受とから構成するようにしている。(Means for Solving the Problem) In order to achieve the above object, the bearing unit of the present invention has the following features:
It consists of a housing made of thermoplastic resin and having a bearing seat, and a bearing that is inserted and fixed while applying ultrasonic vibration to the bearing seat of the housing.
また、本発明の軸受ユニットは、軸受と該軸受よりも小
径の軸受座を有づる熱可塑性樹脂のハウジングとを同軸
上に配置し、それらの間に超音波振動をかけつつ前記軸
受座内に軸受を挿入し、ハウジングの軸受座に対する軸
受の位置決め後、超音波振動を解除して冷却し軸受座に
軸受を固定するようにして’Ｉｆ４３Ｍしている。Further, in the bearing unit of the present invention, a bearing and a thermoplastic resin housing having a bearing seat with a diameter smaller than that of the bearing are arranged coaxially, and ultrasonic vibration is applied between them while the housing is heated inside the bearing seat. After inserting the bearing and positioning the bearing with respect to the bearing seat of the housing, the ultrasonic vibration is canceled and the bearing is cooled to be fixed to the bearing seat.
（作用）
したがって、超音波振動によって軸受とハウジングの軸
受座との間で滑りと内部鷹擦による加熱が起こり、熱可
塑性プラスチックから成る軸受座が部分的に溶融した状
態で軸受が軸受座内に挿入される。軸受は軸受座の溶融
部分を押しのけるようにしてハウジングの軸受座内に埋
め込まれる。(Function) Therefore, the ultrasonic vibration causes sliding between the bearing and the bearing seat of the housing and heating due to internal friction, and the bearing is inserted into the bearing seat with the thermoplastic bearing seat partially melted. inserted. The bearing is embedded within the bearing seat of the housing in a manner that displaces the molten portion of the bearing seat.
そして、部分的溶融状態にある軸受座に対し、軸受が所
定位置・傾きをとるように軸受の挿入の際に軸受を調整
する。その後、超音波振動の付与を解除することによっ
て軸受座の溶融箇所を固め、ハウジングの軸受座に軸受
を固定する。Then, when inserting the bearing, the bearing is adjusted so that it assumes a predetermined position and inclination with respect to the bearing seat that is in a partially molten state. Thereafter, by canceling the application of ultrasonic vibration, the melted portion of the bearing seat is solidified, and the bearing is fixed to the bearing seat of the housing.
また、この軸受ユニット構造によれば軸受座と軸受との
間にハウジングの割れや軸受の圧潰を招くほどの径方向
の力が働かない。Further, according to this bearing unit structure, a radial force that would cause cracking of the housing or crushing of the bearing does not act between the bearing seat and the bearing.
（実施例）
以下、本発明の構成を図面に示す実施例に基づいて詳細
に説明する。(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.
第１図に本発明の軸受ユニットの一例を示す。FIG. 1 shows an example of a bearing unit of the present invention.
二の軸受ユニット１は回転軸を２点で支持する両持タイ
プであり、同一軸上に配置された２個の軸受２，２とこ
の軸受２，２を支持する軸受！ｉ３゜３を有するハウジ
ング４とから構成されている。The second bearing unit 1 is a double-supported type that supports the rotating shaft at two points, and includes two bearings 2, 2 arranged on the same axis and a bearing that supports these bearings 2, 2! It consists of a housing 4 having an i3°3.
軸受２としては、本実施例の場合、焼結合金に潤滑油を
含浸させた円筒状の含油軸受が採用されている。In this embodiment, the bearing 2 is a cylindrical oil-impregnated bearing made of a sintered metal impregnated with lubricating oil.
ハウジング４は、支承しようとする回転軸を通過させる
ための貫通孔５と、軸受２．２を支える筒状の軸受座３
．３を少なくとも有し、好ましくは当該ハウジング４を
他部材に取付けるためのフランジ６を設けている。この
ハウジング４の素材としては、含油軸受の油の蒸発温度
より低融点の熱可塑性樹脂例えばポリカーボネイトやＰ
ＢＴ（ポリブチレンテレフタレート）等が用いられてい
る。また、このハウジング４は軸受座３．３の間に切欠
き７が設けられ、支持する回転軸を露出させるように設
けられている。この場合、支持する軸に径方向の力が加
えられる際の変形を防ぐため補強リブ８が形成されてい
る。The housing 4 has a through hole 5 through which the rotating shaft to be supported passes, and a cylindrical bearing seat 3 that supports the bearing 2.2.
．． 3, and preferably a flange 6 for attaching the housing 4 to another member. The housing 4 is made of a thermoplastic resin having a melting point lower than the evaporation temperature of the oil in the oil-impregnated bearing, such as polycarbonate or P.
BT (polybutylene terephthalate) and the like are used. Further, this housing 4 is provided with a notch 7 between the bearing seats 3.3, so as to expose the rotating shaft to be supported. In this case, reinforcing ribs 8 are formed to prevent deformation when a radial force is applied to the supported shaft.
また、第２図に曲の実施例を示す、この実施例は、切欠
き７のないハウジング構造をとる場合であって、筒状の
ハウジング４の両端から軸受２２を挿入し固定している
。いずれのハウジング構造でも、軸受２，２を支える軸
受座３．３には超音波振動の付与によって軸受２，２と
当接する部位のみが部分的に溶融するなめ凹み９が形成
され、軸受２，２の挿入方向の先端側には垂れ１０が形
成されている。Further, FIG. 2 shows an embodiment of the music. This embodiment has a housing structure without a notch 7, and bearings 22 are inserted and fixed from both ends of the cylindrical housing 4. In either housing structure, a recess 9 is formed in the bearing seat 3.3 that supports the bearings 2, 2, so that only the parts that come into contact with the bearings 2, 2 are partially melted by applying ultrasonic vibration. A sag 10 is formed on the distal end side of 2 in the insertion direction.
以上の構成の軸受ユニットは、次のようにして製造され
る。The bearing unit having the above configuration is manufactured as follows.
まず、治具２０に軸受２を固定する。このとき、治具２
０の軸部２１に軸受２を挿入して軸心を調整する。ここ
で治具２０は例えばアンビル２２に軸部２１を取付けな
ものであり、アンビル２２の上面２３を街とし、軸部２
１をガイドとして軸受２の垂直度及び軸心を調整する［
第３図（ａ）参照］。First, the bearing 2 is fixed to the jig 20. At this time, jig 2
The bearing 2 is inserted into the shaft portion 21 of 0 and the axial center is adjusted. Here, the jig 20 is one for attaching the shaft portion 21 to an anvil 22, for example, and the upper surface 23 of the anvil 22 is used as a center, and the shaft portion 21 is attached to the anvil 22.
Adjust the perpendicularity and axis of bearing 2 using 1 as a guide [
See FIG. 3(a)].
次いで、前述の軸部２１にハウジング４のｉｔ通孔５を
嵌め込んで軸受２にハウジング４を近づける［第３図（
ｂ）参照］、そして、ホーン（図示省略）より超音波振
動を導入しながらハウジング４の軸受座３の一部を溶融
させ、この溶融部２４に軸受２を挿入する［第３図（ｃ
）参照］、また、ハウジング４側を固定し、軸受２側を
移動させて軸受座３に挿入させるようにしてもよい０次
いで、超音波振動をかけつづけながらハウジング４と軸
受２の位置関係を確保する［第３図（ｄ）参照コ。Next, the IT through hole 5 of the housing 4 is fitted into the shaft portion 21 described above, and the housing 4 is brought close to the bearing 2 [Fig.
b)] Then, a part of the bearing seat 3 of the housing 4 is melted while introducing ultrasonic vibration from a horn (not shown), and the bearing 2 is inserted into this melted part 24 [see Fig. 3 (c)].
), the housing 4 side may be fixed, and the bearing 2 side may be moved and inserted into the bearing seat 3.Next, while continuing to apply ultrasonic vibration, the positional relationship between the housing 4 and the bearing 2 may be adjusted. Secure it [see Figure 3(d)].
即ち、軸受２と接するハウジング４の軸受座３の一部分
を溶融させた状態のまま軸受２を径方向ないし軸方向に
移動させて位置関係を調整する。このため、ハウジング
４の外径寸法精度が悪くても、ハウジング４に軸受２を
挿入する際にハウジング４の内側の軸受座３を溶融させ
て上下の軸受２゜２の軸心を合わせながら軸受２をｇ＆
調整移動させて軸受２の同心度と垂直度を確保できる。That is, the positional relationship is adjusted by moving the bearing 2 in the radial or axial direction while keeping a portion of the bearing seat 3 of the housing 4 in contact with the bearing 2 melted. Therefore, even if the outer diameter dimension accuracy of the housing 4 is poor, when inserting the bearing 2 into the housing 4, the bearing seat 3 inside the housing 4 is melted to align the axes of the upper and lower bearings 2°2. 2 to g&
The concentricity and perpendicularity of the bearing 2 can be ensured by adjusting the movement.
次いで、超音波振動の付与を解除し溶融部２４を固化さ
せ、軸受座３の所定位置に軸受２を固定する［第３図（
ｅ）参照］。Next, the application of ultrasonic vibration is canceled to solidify the molten portion 24, and the bearing 2 is fixed at a predetermined position on the bearing seat 3 [Fig.
see e)].
第４図に上述の本発明の軸受ユニッ１トを使用したキャ
プスタンモータの一例を示す、この軸受ユニット１は、
キャプスタンモータ３０の基板３１にハウジング４のフ
ランジ６部分を止めねじ等を用いて固着することによっ
てキャプスタンモータ３０に組込まれている。この軸受
ユニット１は、ロータヨーク３２のボス３３に固着され
ているロータ軸（キャプスタン）３６を軸受２，２で両
端支持している。尚、図中符号３４はマグネット、３５
は駆動コイルである。FIG. 4 shows an example of a capstan motor using the above-described bearing unit 1 of the present invention.
It is assembled into the capstan motor 30 by fixing the flange 6 portion of the housing 4 to the base plate 31 of the capstan motor 30 using a set screw or the like. In this bearing unit 1, a rotor shaft (capstan) 36 fixed to a boss 33 of a rotor yoke 32 is supported at both ends by bearings 2, 2. In addition, the reference numeral 34 in the figure is a magnet, and 35
is the drive coil.
尚、上述の実施例は本発明の好適な実施の一例ではある
がこれに限定されるものではなく本発明の要旨を逸脱し
ない範囲において種々変形実施可能である０例えば、上
述の実施例では軸受２として含油軸受を用いているが、
ボールベアリングのような転がり軸受を用いることも可
能である。この場合、ハウジング材として、溶融温度が
ボールベアリング内の油の蒸発温度よりも低い樹脂を少
なくとも軸受Ｆｉ、３部分に用いることが必要である。Although the above-mentioned embodiment is an example of a preferred embodiment of the present invention, it is not limited thereto, and various modifications can be made without departing from the gist of the present invention.For example, in the above-mentioned embodiment, the bearing 2, an oil-impregnated bearing is used,
It is also possible to use rolling bearings such as ball bearings. In this case, it is necessary to use a resin whose melting temperature is lower than the evaporation temperature of the oil in the ball bearing as the housing material for at least the bearing Fi, 3 portion.
また、軸受２として樹脂軸受を用いることも可能である
。この場合には樹脂軸受の溶融温度がハウジング４の軸
受座３の溶融温度よりも高いことが必要である。Further, it is also possible to use a resin bearing as the bearing 2. In this case, the melting temperature of the resin bearing must be higher than the melting temperature of the bearing seat 3 of the housing 4.
また、上述の実施例では両持ちタイプの軸受ユニットに
ついて主に説明したが片持ちタイプの軸受ユニットにも
適用できるし、ハウジング形状にも限定を受けない。Further, in the above-mentioned embodiments, a double-end type bearing unit was mainly explained, but the present invention can also be applied to a cantilever type bearing unit, and there is no limitation on the shape of the housing.
（発明の効果）
以上の説明より明らかなように、本発明の軸受ユニット
は、軸受と該軸受より小径の軸受座を有する熱可塑性樹
脂のハウジングとを同軸上に配置して超音波振動を加え
つつ軸受をハウジングの軸受座に挿入するようにしたの
で、軸受の周辺の軸受座が溶けた状態でハウジング内へ
軸受が入るため、ハウジングを破損したり軸受が変形す
るのを防ぐことができる。また、ａｌ械的強度面を考慮
しても、軸受の圧入によるハウジングの軸受座への負荷
が少なくなるため、形状の設計に自由度を持つことがで
きる。(Effects of the Invention) As is clear from the above description, the bearing unit of the present invention includes a bearing and a thermoplastic resin housing having a bearing seat smaller in diameter than the bearing, arranged coaxially, and applying ultrasonic vibration to the bearing unit. Since the bearing is inserted into the bearing seat of the housing while the bearing is inserted into the housing, the bearing is inserted into the housing with the bearing seat around the bearing melted, which prevents damage to the housing and deformation of the bearing. Furthermore, even when Al mechanical strength is taken into consideration, the load on the bearing seat of the housing due to the press-fitting of the bearing is reduced, so there is a degree of freedom in designing the shape.
加えて、本発明の軸受ユニットは軸受座を溶かしつつ軸
受を挿入するため、ハウジングに対する軸受の角度を挿
入時に矯正できる。特に図示したような両持ちタイプの
軸受ユニットの場合、軸受をハウジングの軸受座に夫々
挿入した後、両軸受を貫通するシャフト状の治具を使用
して超音波振動を付与すれば、軸受間の同軸度が、ハウ
ジングが多少変形していても確保できる。即ち、ハウジ
ングの寸法精度が多少落ちるものであっても、軸受とし
ての製品に必要な寸法精度を確保できる。In addition, since the bearing unit of the present invention inserts the bearing while melting the bearing seat, the angle of the bearing relative to the housing can be corrected during insertion. In particular, in the case of a double-sided type bearing unit as shown in the figure, if the bearings are inserted into the bearing seats of the housing and then ultrasonic vibration is applied using a shaft-shaped jig that passes through both bearings, the space between the bearings can be increased. coaxiality can be ensured even if the housing is slightly deformed. That is, even if the dimensional accuracy of the housing is somewhat degraded, the dimensional accuracy required for the product as a bearing can be ensured.
したがって、金型の精度が多少悪くとも問題ない。Therefore, there is no problem even if the precision of the mold is somewhat poor.
第１図は本発明の軸受ユニットの一例を示す中央縦断面
図、第２図は他の実施例を示す中央縦断面図、第３図（
ａ）〜（ｅ）は本発明の軸受ユニットの製造工程を説明
する製造工程図、第４図は本発明の軸受ユニットを応用
したキャプスタンモータの一例を示す中央縦断面図であ
る。
１・・・軸受ユニット、２・・・軸受、３・・・軸受座
、４・・・ハウジング。FIG. 1 is a central vertical cross-sectional view showing an example of a bearing unit of the present invention, FIG. 2 is a central vertical cross-sectional view showing another embodiment, and FIG.
a) to (e) are manufacturing process diagrams illustrating the manufacturing process of the bearing unit of the present invention, and FIG. 4 is a central vertical sectional view showing an example of a capstan motor to which the bearing unit of the present invention is applied. 1...Bearing unit, 2...Bearing, 3...Bearing seat, 4...Housing.
Claims (2)
と、該ハウジングの前記軸受座に超音波振動をかけつつ
挿入されて固定された軸受とから成る軸受ユニット。(1) A bearing unit consisting of a housing made of thermoplastic resin and having a bearing seat, and a bearing that is inserted and fixed while applying ultrasonic vibration to the bearing seat of the housing.
性樹脂のハウジングとを同軸上に配置し、それらの間に
超音波振動をかけつつ前記軸受座内に軸受を挿入し、前
記軸受の前記ハウジングの軸受座に対する位置決め後、
超音波振動を解除して冷却し前記軸受座に軸受を固定し
て成る軸受ユニットの製造方法。(2) A bearing and a thermoplastic resin housing having a bearing seat smaller in diameter than the bearing are arranged coaxially, and the bearing is inserted into the bearing seat while applying ultrasonic vibration between them, and the bearing is inserted into the bearing seat. After positioning the housing with respect to the bearing seat,
A method of manufacturing a bearing unit, which comprises removing ultrasonic vibration, cooling, and fixing a bearing to the bearing seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10029789A JPH02280650A (en) | 1989-04-21 | 1989-04-21 | Bearing unit and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10029789A JPH02280650A (en) | 1989-04-21 | 1989-04-21 | Bearing unit and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02280650A true JPH02280650A (en) | 1990-11-16 |
Family
ID=14270238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10029789A Pending JPH02280650A (en) | 1989-04-21 | 1989-04-21 | Bearing unit and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02280650A (en) |
-
1989
- 1989-04-21 JP JP10029789A patent/JPH02280650A/en active Pending
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