JPH0956109A - Motor with composite bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor excellent in rotational performance by employing a bearing unit as is, where components are preassembled in a motor on the manufacturer side. SOLUTION: An inner circumferential rolling groove 2a is made in the outer circumference at the large diameter part of a two stage shaft 1 having a large diameter part 1a and a small diameter part 1b. Balls 4 are filled in the gap between the inner circumferential rolling groove 2a and an outer circumferential rolling groove 2b made in the inner circumferential surface of an outer ring 3 while balls 6 are filled between inner and outer rings 5a, 5b thus constituting a ball bearing 5. A tubular spacer 7 is interposed between the outer ring 5b of the ball bearing 5 and the outer ring 3 on the large diameter part side and the inner ring of ball bearing is fitted over the small diameter part 1b of two stage shaft thus constituting a bearing unit. The bearing unit is fitted with the central hub 11 of the rotor 10 of a motor.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明が属する技術分野】本発明はコンピュータ機器や
その周辺機器に使用するモータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor used for computer equipment and its peripheral equipment.

【０００２】[0002]

【従来の技術】コンピュータ機器やその周辺機器に使用
するモータは、軸とロータのハブとの間に軸受装置を設
けてある。この軸受装置の従来のものは、図３に示すよ
うに部品として２個の玉軸受Ａ、Ｂのほかに筒状スペー
サＣをそれぞれ個々別々に製作し、これら部品をユーザ
たるモータのメーカに納品し、モータメーカにおいてこ
れらの部品を軸Ｄに組み付けている。2. Description of the Related Art Motors used in computer equipment and peripheral equipment have a bearing device provided between a shaft and a hub of a rotor. In the conventional bearing device, as shown in FIG. 3, in addition to two ball bearings A and B as components, a cylindrical spacer C is individually manufactured, and these components are delivered to a motor manufacturer who is a user. However, a motor maker assembles these parts on the shaft D.

【０００３】[0003]

【発明が解決しようとする課題】従来のモータの軸受装
置は上述のようにモータメーカが２個の玉軸受をスペー
サを介して軸へ組み付けねばならないが、次のような問
題点がある。 (a) 軸は玉軸受の内輪の内径寸法に合わせて製作せねば
ならず、また、軸剛性の制約を受ける。 (b) スペーサは２個の玉軸受とは別部品なので、組み合
わせる玉軸受の寸法等に合わせてスペーサの両端面の並
行度および平面度を高精度に仕上げる加工が必要とな
る。 (c) 以上の条件を満たさないと、回転振れが生じたり
し、高い回転性能のモータを得ることはできない。In the conventional motor bearing device, the motor maker has to assemble the two ball bearings to the shaft through the spacers as described above, but there are the following problems. (a) The shaft must be manufactured according to the inner diameter of the inner ring of the ball bearing, and the shaft rigidity is restricted. (b) Since the spacer is a separate part from the two ball bearings, it is necessary to finish the parallelism and flatness of both end surfaces of the spacer with high accuracy according to the dimensions of the ball bearings to be combined. (c) If the above conditions are not satisfied, rotational runout may occur and a motor with high rotational performance cannot be obtained.

【０００４】本発明はこのような問題点が解決され、部
品どうしがすでに組み付けらている軸受装置をモータの
メーカにおいてそのままモータに使用して回転性能の良
好なモータを提供できるようにした。The present invention has solved the above problems and has made it possible for a motor manufacturer to use a bearing device in which parts have already been assembled as it is as a motor to provide a motor having good rotational performance.

【０００５】[0005]

【課題を解決するための手段】本発明に係るモータは、
大径部と小径部を有する二段軸の大径部外周に内周転動
溝を形成し、この内周転動溝と大径部側の外輪の内周面
に形成した外周転動溝との間にボールを充填し、内輪と
外輪の間にボールを充填した玉軸受の外輪と前記大径部
側の外輪との間に筒状のスペーサを挟んで玉軸受の内輪
を前記二段軸の小径部に嵌めてなる軸受装置へ、モータ
におけるロータの中央ハブを嵌合・固定したものとして
ある。The motor according to the present invention comprises:
An inner circumferential rolling groove is formed on the outer circumference of the large diameter portion of a two-stage shaft having a large diameter portion and a small diameter portion, and the inner circumferential rolling groove and the outer circumferential rolling groove formed on the inner circumferential surface of the outer ring on the large diameter portion side. Between the inner ring and the outer ring of the ball bearing filled with balls between the outer ring of the ball bearing and the outer ring of the large diameter portion, a cylindrical spacer is sandwiched between the inner ring of the ball bearing The central hub of the rotor of the motor is fitted and fixed to the bearing device fitted to the small diameter portion of the shaft.

【０００６】なお、その実施態様は、玉軸受の内輪の外
径を二段軸の外径と同径にし、また、玉軸受の外輪はそ
の外径及び内径を大径部側の外輪の外径、内径とそれぞ
れ同径とすることによりボールはすべて同径のものとし
てある。In this embodiment, the outer diameter of the inner ring of the ball bearing is the same as the outer diameter of the two-stage shaft, and the outer ring and inner diameter of the outer ring of the ball bearing are the outer diameter of the outer ring on the large diameter portion side. The balls have the same diameter by making the diameter and the inner diameter the same.

【０００７】[0007]

【実施例】図１は本発明に係るアウタロータタイプモー
タの一実施例を示す。同図において符号１は大径部１ａ
と小径部１ｂを有する二段軸を示し、大径部の外周には
内周転動溝２ａを形成してある。1 shows an embodiment of an outer rotor type motor according to the present invention. In the figure, reference numeral 1 is a large diameter portion 1a.
Shows a two-stage shaft having a small diameter portion 1b, and an inner peripheral rolling groove 2a is formed on the outer periphery of the large diameter portion.

【０００８】３は大径部側の外輪で、その内周面に形成
した外周転動溝２ｂと大径部の前記内周転動溝２ａとの
間にボール４を充填して大径部に組み付けてある。二段
軸１の小径部１ｂには、内輪５ａと外輪５ｂとよりな
り、かつ内外輪間にボール６を充填した玉軸受５の内輪
５ａを嵌合固着せしめてある。７は二段軸１を囲む筒状
のスペーサで、前記大径部側の外輪３と玉軸受５の外輪
５ｂとの間に挟み込んで固定してある。An outer ring 3 on the large diameter portion side is filled with a ball 4 between the outer peripheral rolling groove 2b formed on the inner peripheral surface of the outer ring and the inner peripheral rolling groove 2a of the large diameter portion. It is attached to. An inner ring 5a of a ball bearing 5 having an inner ring 5a and an outer ring 5b and having a ball 6 filled between the inner and outer rings is fitted and fixed to the small diameter portion 1b of the two-stage shaft 1. Reference numeral 7 denotes a cylindrical spacer that surrounds the two-stage shaft 1, and is sandwiched and fixed between the outer ring 3 on the large diameter portion side and the outer ring 5b of the ball bearing 5.

【０００９】また、玉軸受５の内輪５ａの外径を二段軸
１の大径部１ａの外径と同径にし、また、玉軸受５の外
輪５ｂはその外径及び内径を大径部側の外輪３の外径、
内径とそれぞれ同径とすることによりボールはすべて同
径のものとしてある。Further, the outer diameter of the inner ring 5a of the ball bearing 5 is made equal to the outer diameter of the large diameter portion 1a of the two-stage shaft 1, and the outer ring 5b of the ball bearing 5 has its outer diameter and inner diameter set to the large diameter portion. Outer diameter of the outer ring 3 on the side,
The balls have the same diameter by having the same diameter as the inner diameter.

【００１０】この実施例のものでは、玉軸受５の内輪５
ａを二段軸の小径部１ｂに予めスライド可能に嵌め、次
いで内輪に上端面から適正な予圧（プリロード）を付与
し、この予圧が付与された状態で内輪５ａを接着剤など
で二段軸１の小径部１ｂに固定せしめ、外輪、スペーサ
７及び内輪を二段軸に組み付ける。なお、図中の符号８
ａ及び８ｂは玉軸受５の内外輪の各転動溝を示し、ボー
ルは図示省略のリテーナで保持されている。In this embodiment, the inner ring 5 of the ball bearing 5 is
a is preliminarily slidably fitted to the small diameter portion 1b of the two-stage shaft, and then an appropriate preload (preload) is applied to the inner ring from the upper end surface. The outer ring, the spacer 7 and the inner ring are assembled to the two-stage shaft. In addition, reference numeral 8 in the drawing
Reference numerals a and 8b denote rolling grooves of the inner and outer races of the ball bearing 5, and the balls are held by retainers (not shown).

【００１１】上述した実施例ではボールを全て同径のも
のとしてあるが、大径部側と小径部側とでは異なる径の
ボールを使用することもある。Although all the balls have the same diameter in the above-described embodiments, balls having different diameters may be used on the large diameter portion side and the small diameter portion side.

【００１２】このようにアッセンブリした軸受装置を、
その軸の下端をモータのベース９へ固定し、次いでモー
タにおけるロータ１０の中央ハブ１１を軸受装置の外輪
へ嵌合・固定せしめる。なお、符号１２は磁石、１３は
図示省略のステータヨークに捲装した通電用のコイル、
１４はヨークホルダを示す。The bearing device assembled as described above is
The lower end of the shaft is fixed to the base 9 of the motor, and then the central hub 11 of the rotor 10 of the motor is fitted and fixed to the outer ring of the bearing device. Reference numeral 12 is a magnet, 13 is a coil for energization wound around a stator yoke (not shown),
Reference numeral 14 indicates a yoke holder.

【００１３】以上は磁石をロータの外周内側に設けたア
ウタロータタイプのモータであるが、図２のように磁石
１２をロータ１０のハブ１１外周に設けたインナロータ
タイプのモータとする場合もある。The above is the outer rotor type motor in which the magnet is provided inside the outer circumference of the rotor, but there is also a case where the magnet 12 is an inner rotor type motor in which the magnet 12 is provided on the outer circumference of the hub 11 of the rotor 10 as shown in FIG.

【００１４】[0014]

【本発明の作用、効果】本発明に係るモータにおいて
は、その軸受装置が上述した構成のものとしてあるの
で、次ぎの作用、効果がある。In the motor according to the present invention, since the bearing device has the above-mentioned structure, the following actions and effects are obtained.

【００１５】(a) 軸受装置の内輪、外輪、スペーサ、ボ
ール及び軸が軸受メーカによって既に組み付けられてい
るので、モータメーカはこれらの部品を組み付ける必要
がなく、モータのハブを軸受の外輪へ嵌合・固定するこ
とによりモータを軸受装置へ容易に取り付けることがで
きる。 (b) 本発明のモータでは、軸受装置における二段軸の大
径部外周に直接内周転動溝を形成してあるので、従来の
内輪が不要であり、したがってその分だけ軸は一部大径
のものにして二段軸にでき、軸剛性を大ならしめること
ができる。 (c) 軸は大径部を備える剛性の大なるものにできるの
で、レゾナンス（共振点）が高くなり、モータ内の他の
部材との共振を防止でき、モータの回転性能、信頼性を
向上できる。 (d) 従来の玉軸受は１個ですみ、したがって内輪は１個
でよく、部品点数を少なくできる。 (e) 軸の大径部外周には内周転動溝が直接形成されてい
るので、大径部側には内輪が不要であり、したがって内
輪がない分だけ外輪及びスペーサの外径を小ならしめる
ことができ、より小型化のモータという至上要望に応え
ることができる。(A) Since the inner ring, outer ring, spacer, ball and shaft of the bearing device have already been assembled by the bearing manufacturer, the motor manufacturer does not need to assemble these parts, and the motor hub is fitted to the outer ring of the bearing. The motor can be easily attached to the bearing device by fitting and fixing. (b) In the motor of the present invention, since the inner peripheral rolling groove is formed directly on the outer periphery of the large-diameter portion of the two-stage shaft in the bearing device, the conventional inner ring is not necessary, and therefore the shaft is partially correspondingly. The diameter of the shaft can be increased to a two-stage shaft, and the shaft rigidity can be increased. (c) Since the shaft can be made to have a large rigidity with a large diameter part, the resonance (resonance point) will be high and resonance with other members in the motor can be prevented, improving the rotation performance and reliability of the motor. it can. (d) Only one conventional ball bearing is required, so only one inner ring is required, and the number of parts can be reduced. (e) Since the inner circumference rolling groove is directly formed on the outer circumference of the large diameter part of the shaft, the inner ring is not required on the large diameter part side.Therefore, the outer diameter of the outer ring and the spacer is small due to the lack of the inner ring. Therefore, it is possible to meet the highest demand for smaller motors.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係るアウタロータタイプモータの一実
施例を示す縦断面図。FIG. 1 is a longitudinal sectional view showing an embodiment of an outer rotor type motor according to the present invention.

【図２】本発明に係るインナロータタイプモータの一実
施例を示す縦断面図。FIG. 2 is a vertical sectional view showing an embodiment of an inner rotor type motor according to the present invention.

【図３】従来の軸受の構成を示し、(a) は組み付け前の
玉軸受及びスペーサを示す縦断面図、(b) は玉軸受及び
スペーサを軸へ組み付けた状態を示す縦断面図。FIG. 3 shows a configuration of a conventional bearing, (a) is a vertical sectional view showing a ball bearing and a spacer before assembly, and (b) is a vertical sectional view showing a state in which the ball bearing and the spacer are assembled to a shaft.

【符号の説明】[Explanation of symbols]

１ 二段軸 １ａ 大径部 １ｂ 小径部 ２ａ 内周転動溝 ２ｂ 外周転動溝 ３ 外輪 ４ ボール ５ 玉軸受 ５ａ 内輪 ５ｂ 外輪 ６ ボール ７ スペーサ ８ａ、８ｂ 転動溝 ９ モータのベース １０ ロータ １１ ハブ １２ 磁石 １３ 通電用コイル １４ ヨークホルダ 1 Two-step shaft 1a Large diameter part 1b Small diameter part 2a Inner peripheral rolling groove 2b Outer peripheral rolling groove 3 Outer ring 4 Ball 5 Ball bearing 5a Inner ring 5b Outer ring 6 Ball 7 Spacer 8a, 8b Rolling groove 9 Motor base 10 Rotor 11 Hub 12 Magnet 13 Energizing coil 14 Yoke holder

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】大径部と小径部を有する二段軸の大径部外
周に内周転動溝を形成し、この内周転動溝と大径部側の
外輪の内周面に形成した外周転動溝との間にボールを充
填し、内輪と外輪の間にボールを充填した玉軸受の外輪
と前記大径部側の外輪との間に筒状のスペーサを挟んで
玉軸受の内輪を前記二段軸の小径部に嵌めてなる軸受装
置へ、モータにおけるロータの中央ハブを嵌合・固定し
てなる複合軸受装置を備えるモータ。1. An inner circumferential rolling groove is formed on the outer circumference of the large diameter portion of a two-stage shaft having a large diameter portion and a small diameter portion, and is formed on the inner circumferential rolling groove and the inner circumferential surface of the outer ring on the large diameter portion side. A ball spacer is inserted between the outer ring of the ball bearing in which the ball is filled between the outer ring and the outer ring and the outer ring of the large diameter portion, which is filled between the inner ring and the outer ring. A motor comprising a composite bearing device in which a center hub of a rotor of the motor is fitted and fixed to a bearing device in which an inner ring is fitted in a small diameter portion of the two-stage shaft.