JP3543481B2 - Motor bearing device - Google Patents
Motor bearing device Download PDFInfo
- Publication number
- JP3543481B2 JP3543481B2 JP10668696A JP10668696A JP3543481B2 JP 3543481 B2 JP3543481 B2 JP 3543481B2 JP 10668696 A JP10668696 A JP 10668696A JP 10668696 A JP10668696 A JP 10668696A JP 3543481 B2 JP3543481 B2 JP 3543481B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- impregnated metal
- bearing device
- motor
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Sliding-Contact Bearings (AREA)
- Brushless Motors (AREA)
- Motor Or Generator Frames (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、特にＣＤ−ＲＯＭ，ＣＤやＭＤ等のディスク回転伝達に用いるスピンドルモータの軸受装置に関するものである。
【０００２】
【従来の技術】
近年、ＣＤ−ＲＯＭ，ＣＤやＭＤ等の機器は、低コスト，高信頼性の要望が多くなり、それに使用されるスピンドルモータも軸受に安価な含油メタルを用いたブラシレスモータが採用されつつある。ＣＤ−ＲＯＭ等に採用されているモータは特開平７−５９３２４号公報や特開平８−３３３００号公報に記載された構造のモータが一般に知られている。
【０００３】
以下に、図面を参照しながら従来のモータの構造、特に軸受構造の一例について説明する。
図４は特開平８−３３３００号公報記載の従来のモータの構造を示す断面図である。図４において、１は回転伝達を行う出力軸、２は含油メタル、３は含油メタルを保持するハウジング、４は回転子、５は固定子、６はプリント基板から成るブラケットである。モータは回転子４と固定子５の間に順次発生する磁気力により回転力を得、回転子４の中央に固定された出力軸１が、前記含油メタル２と、前記ブラケット６に固定されたハウジング３とから構成された軸受装置により回転自在に支承され、精度の良い回転を外部に伝達する。
【０００４】
【発明が解決しようとする課題】
しかしながら上記のような構成では、含油メタル外周がハウジングで密閉されているため、出力軸が回転する時に出力軸と含油メタルの接触部に発生する圧力により、含油メタルの端面への圧力が増大し、含油メタル端面にオイルが吹き出し、特に回転子の天面側ではこの内部天面に付着する。さらに、回転子に付着したオイルは遠心力により回転子の内部天面をラジアル方向に拡散し、含油メタルには回帰しないため含油メタルに保持されたオイルが減少し正常な潤滑作用が働かなくなり、精度の良い回転伝達が行われないという課題を有していた。
【０００５】
本発明は含油メタル端面へのオイルの吹き出しを少なくし、精度の良い回転伝達を長時間維持できるモータの軸受装置、及びこの装置を備えた優れたモータを提供することを目的とする。
【０００６】
【課題を解決するための手段】
この目的を達成するために本発明のモータの軸受装置は、含油メタルとハウジングの圧入部の回転子の天面側に、含油メタルの外周を密閉しない部分を設けたものである。この構成により含油メタルの端面への圧力を低下させ、含油メタル端面へのオイルの吹き出しを少なくでき、精度の良い回転伝達を長時間維持できるモータの軸受装置が得られる。
【０００７】
【発明の実施の形態】
本発明は、回転子と、この回転子と対向して配置された固定子と、前記回転子の中央に固定された回転軸と、この回転軸を回転自在に支承する含油メタルとこの含油メタルの外周を圧入して保持するハウジングとから成る軸受装置と、このハウジングを固定するブラケットとを有するモータの前記軸受装置において、前記ハウジングを、前記含油メタル保持部の寸法が前記含油メタルの全長の１／２から４／５の大きさで前記ブラケットと一体に形成したことを特徴とするモータの軸受装置、及びこの軸受装置を備えるモータであり、この構成により、含油メタル外周がハウジングで密閉された場合に生じる、出力軸が回転する時に出力軸と含油メタルの接触部に発生する圧力により含油メタルのオイルが含油メタル端面に吹き出す現象を、含油メタルの外周をハウジングに圧入しない部分を設けて回転子天面側の含油メタルの外周を開放することにより、含油メタル端面へのオイルの吹き出しを抑制でき、併せてブラケットとハウジングを一体に形成することにより、モータ構成部品数を削減できるという作用を有する。
【０００８】
【実施例】
以下、本発明の実施例を図面を用いて説明する。
（実施例１）
図１は、モータのブラケット６とハウジング３を一体に形成させ、ハウジング３の含油メタル保持部９の寸法を含油メタル２の全長より短くして、回転子４側の含油メタル２の外周を開放したものである。
【０００９】
【発明の効果】
以上のように本発明によれば、含油メタルとハウジングの圧入部の回転子の天面側に、含油メタルの外周を密閉しない部分を設けることにより、含油メタルの端面への圧力を低下させ、オイルのメタル端面へ吹き出しを少なくし、精度の良い回転伝達を長時間維持することのできモータの軸受装置と、これを備える優れたモータが実現できるものである。
【図面の簡単な説明】
【図１】本発明の実施例１におけるモータの断面図
【図２】従来のモータの構造を示す断面図
【符号の説明】
１ 出力軸
２ 含油メタル
３ ハウジング
４ 回転子
５ 固定子
６ ブラケット
９ 含油メタル保持部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention particularly relates to a bearing device of a spindle motor used for transmitting rotation of a disk such as a CD-ROM, a CD, and an MD.
[0002]
[Prior art]
In recent years, demands for low cost and high reliability of devices such as CD-ROMs, CDs and MDs have increased, and a brushless motor using an inexpensive oil-impregnated metal for a bearing has been adopted as a spindle motor used for the device. As a motor used in a CD-ROM or the like, a motor having a structure described in JP-A-7-59324 or JP-A-8-33300 is generally known.
[0003]
Hereinafter, an example of a conventional motor structure, particularly, an example of a bearing structure will be described with reference to the drawings.
FIG. 4 is a sectional view showing the structure of a conventional motor described in Japanese Patent Application Laid-Open No. 8-33300. In FIG. 4, 1 is an output shaft for transmitting rotation, 2 is an oil-impregnated metal, 3 is a housing for holding the oil-impregnated metal, 4 is a rotor, 5 is a stator, and 6 is a bracket made of a printed circuit board. The motor obtains torque by the magnetic force sequentially generated between the
[0004]
[Problems to be solved by the invention]
However, in the above configuration, since the outer periphery of the oil-impregnated metal is sealed by the housing, the pressure generated at the contact portion between the output shaft and the oil-impregnated metal when the output shaft rotates increases the pressure on the end face of the oil-impregnated metal. Then, oil blows out to the end surface of the oil-impregnated metal, and adheres to the inner top surface particularly on the top surface side of the rotor. Furthermore, the oil adhering to the rotor diffuses radially on the inner top surface of the rotor due to centrifugal force and does not return to the oil-impregnated metal, so the oil retained on the oil-impregnated metal decreases and the normal lubrication function does not work, There is a problem that accurate rotation transmission is not performed.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a bearing device for a motor that can reduce the amount of oil blown out to the end surface of an oil-impregnated metal and maintain accurate rotation transmission for a long time, and an excellent motor provided with the device.
[0006]
[Means for Solving the Problems]
In order to achieve this object, a motor bearing device according to the present invention is provided with a portion that does not hermetically seal the outer periphery of the oil-impregnated metal on the top surface side of the rotor at the press-fit portion of the oil-impregnated metal. With this configuration, it is possible to reduce the pressure on the end surface of the oil-impregnated metal, reduce the amount of oil blown out to the end surface of the oil-impregnated metal, and obtain a motor bearing device that can maintain accurate rotation transmission for a long time.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention relates to a rotor, a stator disposed opposite to the rotor, a rotation shaft fixed to the center of the rotor, an oil-impregnated metal rotatably supporting the rotation shaft, and an oil-impregnated metal. A bearing device comprising a housing for press-fitting and holding an outer periphery of the bearing and a bracket for fixing the housing, wherein the housing has a size of the oil-impregnated metal holding portion corresponding to the total length of the oil-impregnated metal. A motor bearing device having a size of 1/2 to 4/5 and integrally formed with the bracket, and a motor including the bearing device. With this configuration, the outer periphery of the oil-impregnated metal is sealed by the housing. The phenomenon that occurs when the output shaft rotates and the pressure generated at the contact between the output shaft and the oil-impregnated metal causes the oil of the oil-impregnated metal to blow out to the end face of the oil-impregnated metal, By providing a part where the outer circumference of the oil metal is not pressed into the housing and opening the outer circumference of the oil-impregnated metal on the top surface of the rotor, it is possible to suppress the oil from blowing out to the end face of the oil-impregnated metal. By doing so, the number of motor components can be reduced.
[0008]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Example 1)
FIG. 1 shows that the
[0009]
【The invention's effect】
As described above, according to the present invention, the pressure on the end surface of the oil-impregnated metal is reduced by providing the oil-impregnated metal with a portion that does not seal the outer periphery of the oil-impregnated metal on the top surface side of the rotor at the press-fit portion of the housing. A bearing device for a motor which can reduce oil blowout to a metal end face and maintain accurate rotation transmission for a long time, and an excellent motor having the bearing device can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a motor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a structure of a conventional motor.
DESCRIPTION OF SYMBOLS 1
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10668696A JP3543481B2 (en) | 1996-04-26 | 1996-04-26 | Motor bearing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10668696A JP3543481B2 (en) | 1996-04-26 | 1996-04-26 | Motor bearing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09294350A JPH09294350A (en) | 1997-11-11 |
| JP3543481B2 true JP3543481B2 (en) | 2004-07-14 |
Family
ID=14439946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10668696A Expired - Fee Related JP3543481B2 (en) | 1996-04-26 | 1996-04-26 | Motor bearing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3543481B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7109620B2 (en) | 2003-11-14 | 2006-09-19 | Nidec Corporation | Motor and display unit |
| JP4572554B2 (en) * | 2004-03-25 | 2010-11-04 | 日本電産株式会社 | motor |
-
1996
- 1996-04-26 JP JP10668696A patent/JP3543481B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09294350A (en) | 1997-11-11 |
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