JP2905386B2 - Bearing device and method of manufacturing the same - Google Patents
Bearing device and method of manufacturing the sameInfo
- Publication number
- JP2905386B2 JP2905386B2 JP2614194A JP2614194A JP2905386B2 JP 2905386 B2 JP2905386 B2 JP 2905386B2 JP 2614194 A JP2614194 A JP 2614194A JP 2614194 A JP2614194 A JP 2614194A JP 2905386 B2 JP2905386 B2 JP 2905386B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- rotating shaft
- center hole
- shaft
- bearing device
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 description 11
- 210000002105 tongue Anatomy 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 6
- 102220057728 rs151235720 Human genes 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばフロッピーディ
スクドライブ装置等に適用される軸受装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device applied to, for example, a floppy disk drive.
【０００２】[0002]
【従来例】フロッピーディスク等を回転駆動するモータ
の軸受装置には焼結含油軸受が多く用いられる。このよ
うな軸受装置を使用したモータが、先に出願した実願平
５−５０１４１号に記載されている。以下、このような
焼結含油軸受からなる軸受装置を使用したモータの例に
ついて図面を参照しながら説明する。図１７において、
基板４１上にはスラスト軸受４７が取付けられており、
スラスト軸受４７を上方から覆うような形態で筒状の軸
受４８が取付けられている。軸受４８は無数の微小なポ
ーラスを有する焼結含油軸受からなり、上記ポーラスに
は、後述する回転軸が回転する場合に油膜を形成するた
めの軸受油が含浸されている。軸受４８の中心孔の内周
面には動圧効果を得るために、図１８、図１９に示すよ
うな凹部４８ａと凸部４８ｂが交互に中心軸線と平行に
形成されている。2. Description of the Related Art Sintered oil-impregnated bearings are often used in bearing devices for motors that rotate a floppy disk or the like. A motor using such a bearing device is described in Japanese Utility Model Application No. 5-50141 filed earlier. Hereinafter, an example of a motor using a bearing device including such a sintered oil-impregnated bearing will be described with reference to the drawings. In FIG.
A thrust bearing 47 is mounted on the substrate 41,
A cylindrical bearing 48 is attached so as to cover the thrust bearing 47 from above. The bearing 48 is made of a sintered oil-impregnated bearing having countless minute porous parts, and the porous part is impregnated with a bearing oil for forming an oil film when a rotating shaft described later rotates. On the inner peripheral surface of the center hole of the bearing 48, concave portions 48a and convex portions 48b as shown in FIGS. 18 and 19 are alternately formed in parallel with the central axis in order to obtain a dynamic pressure effect.
【０００３】また、図１７において、スラスト軸受４７
の外周縁部は軸受４８下部の内周縁部によって基板４１
側に押さえ付けられ、固定されている。軸受４８の下部
の外周面にはスペーサ４９が取付けられている。スペー
サ４９の下部には突出部４９ａが形成されており、この
突出部４９ａは基板４１上に形成された孔に嵌め込まれ
ている。また、スペーサ４９には適宜数のねじ５０が挿
入されて基板４１にねじ込まれており、このねじ５０の
頭部が軸受４８の段部を押さえ付けることによってスペ
ーサ４９および軸受４８は基板４１上に固定されてい
る。軸受４８の外周でスペーサ４９の上部にはステータ
コア４６が取付けられており、ねじ５０の頭部によって
ステータコア４６も基板４１側に押さえ付けられなが
ら、スペーサ４９を介して基板４１に固定されている。
ステータコア４６は、コア素体を複数枚積層することに
よって形成されており、外周には複数の突極を有してい
る。また、ステータコア４６の外周の各突極にはコイル
４５が巻回されている。In FIG. 17, a thrust bearing 47 is provided.
Of the substrate 41 is formed by the inner peripheral edge below the bearing 48.
Pressed to the side and fixed. A spacer 49 is attached to an outer peripheral surface of a lower portion of the bearing 48. A protrusion 49 a is formed below the spacer 49, and the protrusion 49 a is fitted into a hole formed on the substrate 41. An appropriate number of screws 50 are inserted into the spacer 49 and screwed into the substrate 41. The head of the screw 50 presses the step of the bearing 48 so that the spacer 49 and the bearing 48 are placed on the substrate 41. Fixed. A stator core 46 is mounted on the outer periphery of the bearing 48 and above the spacer 49, and the stator core 46 is also fixed to the substrate 41 via the spacer 49 while being pressed against the substrate 41 by the head of the screw 50.
The stator core 46 is formed by laminating a plurality of core bodies, and has a plurality of salient poles on the outer periphery. A coil 45 is wound around each salient pole on the outer periphery of the stator core 46.
【０００４】軸受４８の中央孔には回転軸４３が挿入さ
れている。回転軸４３の下端部は、スラスト軸受４７と
当接してスラスト方向に支持されるとともに、軸受４８
によってラジアル方向に支持され、回転自在となってい
る。回転軸４３の上端部にはカップ状のロータケース４
２が取付けられている。ロータケース４２の周壁内面に
は環状の駆動マグネット４４が取付けられている。駆動
マグネット４４の内周面はステータコア４６の突極と一
定の間隙をおいて対向しており、したがって、コイル４
５を通電制御することによってロータケース４２は付勢
され、回転軸４３が回転駆動される。A rotary shaft 43 is inserted into a center hole of the bearing 48. The lower end of the rotating shaft 43 contacts the thrust bearing 47 and is supported in the thrust direction.
And is rotatable in the radial direction. A cup-shaped rotor case 4 is provided at the upper end of the rotating shaft 43.
2 are installed. An annular drive magnet 44 is mounted on the inner surface of the peripheral wall of the rotor case 42. The inner peripheral surface of the drive magnet 44 faces the salient poles of the stator core 46 with a certain gap therebetween.
By controlling the energization of the rotor 5, the rotor case 42 is biased, and the rotating shaft 43 is driven to rotate.
【０００５】回転軸４３が回転することにより、軸受４
８の内部に保持された軸受油によって回転軸４３との摺
接面に油膜が生じ、回転軸４３が円滑に回転駆動され
る。When the rotating shaft 43 rotates, the bearing 4
An oil film is formed on the surface in sliding contact with the rotating shaft 43 due to the bearing oil held inside 8, and the rotating shaft 43 is smoothly driven to rotate.
【０００６】[0006]
【発明が解決しようとする課題】以上のような軸受装置
の軸受４８の内周面には、中心軸線方向の複数の凹部４
８ａ及び凸部４８ｂが周方向に交互に形成されているた
め、図２０に示すように、軸受４８の端面に上記凹部４
８ａが開口しており、回転軸４３の回転によって軸受４
８内部を満たす軸受油が上記開口部側に及び、凹部４８
ａから外部に流出してしまう。軸受油が外部に流出する
と、他の部品に付着して悪影響を及ぼすし、軸受油の軸
受４８内部を満たす量が低下してしまうため、軸受４８
及び回転軸４３に磨耗等が生じ、軸受４８と回転軸４３
の寿命が低下してしまう。On the inner peripheral surface of the bearing 48 of the above-described bearing device, a plurality of recesses 4 in the center axis direction are provided.
8a and the projections 48b are alternately formed in the circumferential direction, so that the recess 4 is formed on the end face of the bearing 48 as shown in FIG.
8a is open, and the bearing 4
8, the bearing oil filling the inside extends to the opening side, and the recess 48
a to the outside. If the bearing oil leaks to the outside, it will adhere to other parts and have an adverse effect, and the amount of the bearing oil filling the inside of the bearing 48 will decrease.
And the rotating shaft 43 is worn, and the bearing 48 and the rotating shaft 43
The life of the device will be reduced.
【０００７】また、軸受装置を有するモータを起動した
直後には、軸受４８の内周面に油膜動圧効果が発揮され
ないので、回転軸４３は軸受４８の内周端部と接触しな
がら回転する。しかし、上記軸受装置の軸受４８の内周
面には凸部４８ｂが複数形成されているため、モータの
起動直後に、回転軸４３と凸部４８ｂが接触し、回転軸
４３は半径方向に不規則に振動してしまう。このような
振動は、図２１に示すように、起動後から一定の時間が
経過して軸受４８の内周面に油膜動圧効果が発揮される
と低下し、内周面に凸部４８ｂを有していないものと同
等となる。しかし、このような内周面に凸部４８ｂを有
する軸受装置を、フロッピーディスクドライブ装置のス
ピンドルモータに使用すると、起動直後に、振動によっ
て、記録媒体と磁気ヘッドのトラックずれが多発し、読
み取りあるいは書き込みエラー等の問題が生じてしまう
ため、回転軸４３の回転が安定するまで一定時間を経過
させないと正常に使用できなかった。Immediately after the motor having the bearing device is started, the oil film dynamic pressure effect is not exerted on the inner peripheral surface of the bearing 48, so that the rotating shaft 43 rotates while being in contact with the inner peripheral end of the bearing 48. . However, since a plurality of protrusions 48b are formed on the inner peripheral surface of the bearing 48 of the above-described bearing device, the rotating shaft 43 comes into contact with the protrusions 48b immediately after the motor is started, and the rotating shaft 43 does not move radially. It vibrates regularly. As shown in FIG. 21, such a vibration is reduced when a certain time has elapsed after the start and the oil film dynamic pressure effect is exerted on the inner peripheral surface of the bearing 48, and the convex portion 48 b is formed on the inner peripheral surface. It is equivalent to the one not having. However, when such a bearing device having the convex portion 48b on the inner peripheral surface is used for a spindle motor of a floppy disk drive device, immediately after the start, a track misalignment between the recording medium and the magnetic head frequently occurs due to vibration, and reading or reading is performed. Since a problem such as a writing error occurs, the device cannot be used normally unless a certain time elapses until the rotation of the rotating shaft 43 is stabilized.
【０００８】本発明は、以上のような問題点を解決する
ためになされたもので、軸受からの軸受油の流出を抑え
るとともに、回転軸が回転し始めた際のがたつきや芯振
れを無くした軸受装置及びその製造方法を提供すること
を目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to suppress the outflow of bearing oil from a bearing and to prevent rattling and runout when the rotating shaft starts to rotate. An object of the present invention is to provide a lost bearing device and a method of manufacturing the same.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の発明は、
軸と、中心孔で軸を支承する焼結含油軸受とを備え、こ
のうちいずれか一方が他方に対して回転する軸受装置に
おいて、上記軸受の中心孔の内周面には、軸方向に均一
の幅かつ均一の深さの凹部と、軸方向に均一の幅かつ均
一の高さで上記軸に摺接可能に臨む凸部とが設けられて
いると共に、軸受の開口部の少なくとも一端側の内周に
は、環状の突出部が形成されていることを特徴とする。According to the first aspect of the present invention,
A bearing device comprising a shaft and a sintered oil-impregnated bearing that supports the shaft with a center hole, wherein one of the bearings rotates relative to the other.
Recess with a uniform width and uniform depth and a uniform width and uniform depth in the axial direction.
A convex portion which is slidably contacting the shaft at one height is provided, and an annular protruding portion is formed on at least one inner side of the opening of the bearing. I do.
【００１０】請求項２記載の発明は、請求項１記載の軸
受装置において、環状の突出部は、一部が切り欠かれて
いることを特徴とする。 According to a second aspect of the present invention, there is provided the shaft according to the first aspect.
In the receiving device, the annular projection is partially cut out
It is characterized by being.
【００１１】請求項３記載の発明は、軸受の中心孔にパ
ンチを圧入して内周面に凹部および凸部を形成する工
程、軸受の中心孔にガイド治具を挿入してから、軸受の
端部を整形パンチによって塑性変形させて環状の突出部
を形成する工程を有することを特徴とする。 The invention according to claim 3 is characterized in that the center hole of the bearing is
To form recesses and protrusions on the inner peripheral surface by press-fitting
After inserting the guide jig into the center hole of the bearing,
The end is plastically deformed with a shaping punch to form an annular protrusion
Is formed.
【００１２】請求項４記載の発明は、請求項１記載の軸
受装置において、焼結含油軸受の一端側の中心孔にスラ
スト軸受が結合されると共に、回転軸を上記焼結含油軸
受に取付ける際に上記焼結含油軸受内部と外気とを連通
させるために、焼結含油軸受のスラスト軸受側の端面に
溝が形成され、この溝にスラスト軸受に設けられた可撓
性の舌片部が当接していることを特徴とする。 According to a fourth aspect of the present invention, there is provided the shaft according to the first aspect.
In the receiving device, insert a slide into the center hole on one end of the sintered oil-impregnated bearing.
The strike bearing is coupled and the rotating shaft is
Communication between the inside of the sintered oil-impregnated bearing and the outside air when mounted on
To the end surface of the sintered oil-impregnated bearing on the thrust bearing side.
A groove is formed, and a flexible groove provided on the thrust bearing is formed in the groove.
It is characterized in that the sex tongues are in contact.
【００１３】[0013]
【００１４】[0014]
【００１５】[0015]
【作用】軸受の開口部の少なくとも一端側の内周に、環
状の突出部を形成することにより、軸受内部から開口部
側へ及んだ軸受油が凹部から流出するのを上記突出部が
遮断する。また、円環状の突出部に回転軸が摺接するこ
とにより回転軸及び軸受のいずれか一方が回転し始めた
際のがたつきを無くすことができる。An annular projection is formed at least on one inner side of the opening of the bearing, so that the projection blocks the bearing oil from the inside of the bearing toward the opening from flowing out of the recess. I do. In addition, it is possible to eliminate rattling when one of the rotating shaft and the bearing starts rotating by the sliding contact of the rotating shaft with the annular projection.
【００１６】[0016]
【実施例】以下、本発明にかかる軸受装置の実施例につ
いて図面を参照しながら説明する。図１、図２におい
て、焼結により形成された筒状の軸受３の中心孔２の内
周面には、中心軸線方向の凹部４及び凸部５が周方向に
交互に複数形成されている。軸受３の中心孔２の開口端
部のうち一端側の内周には、全周に渡って環状の突出部
７が形成されている。突出部７は凸部５と同じ高さとな
っており、しかも、突出部７と凸部５は互いに連通して
いる。このような軸受３の無数の微小なポーラスには軸
受油が注入され、軸受３の中心孔２には、図示しない回
転軸が挿入される。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bearing device according to an embodiment of the present invention. 1 and 2, a plurality of concave portions 4 and convex portions 5 in the central axis direction are alternately formed in the circumferential direction on the inner peripheral surface of the central hole 2 of the cylindrical bearing 3 formed by sintering. . An annular protruding portion 7 is formed all around the inner periphery of one end of the opening end of the center hole 2 of the bearing 3. The protrusion 7 has the same height as the protrusion 5, and the protrusion 7 and the protrusion 5 communicate with each other. Bearing oil is injected into countless minute porous portions of the bearing 3, and a rotating shaft (not shown) is inserted into the center hole 2 of the bearing 3.
【００１７】以上のように、軸受３の中心孔２内周面の
軸方向一端部に全周に渡って突出部７を形成することに
より、回転軸が中心孔２の内周で回転することによって
染み出してくる軸受油が軸受３の端部から流出するのを
突出部７で抑えることができ、凹部４および凸部５によ
る動圧効果を長期にわたり維持することができるし、軸
受油が他の部品に付着して悪影響が及ぶのを防止するこ
とができる。As described above, by forming the protruding portion 7 over the entire circumference at one end in the axial direction of the inner peripheral surface of the center hole 2 of the bearing 3, the rotation shaft rotates around the inner periphery of the central hole 2. It is possible to prevent the bearing oil leaking out from the end of the bearing 3 from leaking out from the end of the bearing 3 by the protrusion 7, and to maintain the dynamic pressure effect by the concave portion 4 and the convex portion 5 for a long period of time. It is possible to prevent adverse effects due to adhesion to other parts.
【００１８】また、軸受３の一端部の内周面が凹凸状で
はなく略真円状の突出部７となっているため、図４に示
すように、回転軸が回転し始めた際の振れを解消するこ
とができ、回転軸の芯振れ特性（ＮＲＲＯ）を向上させ
ることができる。また、回転軸が回転し始めた直後か
ら、振れ等がなく安定した回転を得ることができるた
め、従来例のように動作が安定するまで一定時間を経過
させる必要もない。Further, since the inner peripheral surface at one end of the bearing 3 is not a concave and convex shape but a substantially circular projecting portion 7, as shown in FIG. Can be eliminated, and the runout characteristic (NRRO) of the rotating shaft can be improved. In addition, since a stable rotation can be obtained immediately after the rotation shaft starts to rotate without a run-out or the like, it is not necessary to allow a certain time to elapse until the operation is stabilized unlike the conventional example.
【００１９】なお、突出部７は中心孔２の軸方向の一端
のみに限られるものではない。たとえば、図３に示すよ
うに、突出部７を中心孔２の軸方向両端に形成すれば、
なお一層、軸受油の流出を抑えることができるし、回転
軸のがたつきを押さえることができる。The protrusion 7 is not limited to only one end of the center hole 2 in the axial direction. For example, as shown in FIG. 3, if the protrusions 7 are formed at both axial ends of the center hole 2,
Further, the outflow of the bearing oil can be suppressed, and the rattling of the rotating shaft can be suppressed.
【００２０】図２において、突出部７の軸方向の幅寸法
は、軸受３の軸線方向寸法の１／２以下であれば、充分
な特性を得ることができる。また、突出部７の軸方向の
幅寸法は一定である必要はない。部分的に幅寸法が大き
くなったり、あるいは、小さくなったりしてもよい。In FIG. 2, if the width of the projection 7 in the axial direction is equal to or less than half the axial dimension of the bearing 3, sufficient characteristics can be obtained. The axial width of the protrusion 7 does not need to be constant. The width dimension may partially increase or decrease.
【００２１】また、回転軸の側圧方向が決まっている場
合は、突出部７は全周に渡って形成しなくてもよく、図
５、図６に示すように、突出部７の一部に切欠き９があ
ってよい。回転軸に図５で矢印方向に側圧がかかるもの
とすれば、この側圧がかかる方向とは反対側に上記切欠
き９を形成する。突出部７の角度幅と軸受３から軸受け
油が漏れる量との関係を調べた結果を図７に示す。図７
から明らかなように、突出部７の角度幅が３３０°以
上、すなわち切欠き９の角度幅が３０°よりも小さけれ
ば、切欠き９から軸受け油が漏れる量を実用上問題のな
いレベルとすることができる。When the side pressure direction of the rotating shaft is fixed, the projecting portion 7 does not need to be formed over the entire circumference, and as shown in FIGS. There may be a notch 9. Assuming that a lateral pressure is applied to the rotating shaft in the direction of the arrow in FIG. 5, the notch 9 is formed on the side opposite to the direction in which the lateral pressure is applied. FIG. 7 shows the result of examining the relationship between the angular width of the protrusion 7 and the amount of bearing oil leaking from the bearing 3. FIG.
As is apparent from the above, if the angular width of the protruding portion 7 is 330 ° or more, that is, the angular width of the notch 9 is smaller than 30 °, the amount of bearing oil leaking from the notch 9 is set to a level that causes no practical problem. be able to.
【００２２】次に、以上のような軸受装置の製造方法の
例について説明する。金型によって焼結成形された軸受
３の中心孔２に対して、図８に示すようなパンチ１０を
圧入する。パンチ１０はほぼ円柱状で、外周面には軸線
方向に凸状の凹部形成部１０ａが複数個形成され、各凹
部形成部１０ａの間には凹状の凸部形成部１０ｂが形成
されている。凸状の凹部形成部１０ａの上部には凹状の
凸部形成部１０ｂと同じ高さであり、パンチ１０の円柱
状の基体と同一径の突出部形成部１０ｃが形成されてい
る。Next, an example of a method for manufacturing the above bearing device will be described. A punch 10 as shown in FIG. 8 is pressed into the center hole 2 of the bearing 3 formed by sintering with a mold. The punch 10 has a substantially columnar shape, and a plurality of concave portion forming portions 10a that are convex in the axial direction are formed on the outer peripheral surface, and a concave convex portion forming portion 10b is formed between each concave portion forming portion 10a. A protruding portion forming portion 10c having the same height as the concave protruding portion forming portion 10b and having the same diameter as the columnar base of the punch 10 is formed above the protruding concave portion forming portion 10a.
【００２３】以上のようなパンチ１０を軸受３の中心孔
２に対して下側から圧入すると、軸受３の内周面でパン
チ１０の凸状の凹部形成部１０ａが位置する箇所のみ押
潰されて複数の凹部４が形成される。一方、パンチ１０
の凹状の凸部形成部１０ｂ及び突出部形成部１０ｃが位
置する箇所は、特に押潰されたりすることはないが、隣
接位置に凹部４が形成されるため、凹部４に対しては内
周方向に突出した形状となり、凸部５及び円環状の突出
部７となる。When the punch 10 as described above is pressed into the center hole 2 of the bearing 3 from below, only the portion of the inner peripheral surface of the bearing 3 where the convex recessed portion 10a of the punch 10 is located is crushed. Thus, a plurality of recesses 4 are formed. Meanwhile, punch 10
Are not particularly crushed, but the concave portion 4 is formed at an adjacent position, so that the inner peripheral portion of the concave portion forming portion 10b and the projecting portion forming portion 10c is formed. Thus, the projection 5 has a shape protruding in the direction, and the projection 5 and the annular projection 7 are formed.
【００２４】軸受装置のさらに別の形成方法として、図
１７乃至図１９に示した従来の軸受に対し、端部付近を
塑性変形させることにより、略全周にわたって突出部７
を形成するようにしてもよい。例えば、従来同様に軸受
１３の内周面に予め凸部５及び凹部４を交互に複数個形
成した後、図９（ａ）に示すように、軸受１３の中心孔
２に所定の外径のガイド治具１４を挿入してから、軸受
１３の上端に整形パンチ１２の刃を喰い込ませて塑性変
形させてもよい。また、例えば、図９（ｂ）に示すよう
に軸受１６の端部を肉薄の円筒部１７に形成しておき、
軸受１６の中心孔２に所定の外径のガイド治具を挿入し
てから、軸受１６の円筒部１７の外径よりやや小径の内
孔を形成した整形パンチ１５によって、円筒部１７を絞
り込んで塑性変形させてもよい。このような形成方法で
は、軸受の上端を整形パンチによって塑性変形させる手
法を用いるため、突出部７の寸法精度を向上させ、高品
質な軸受装置を得ることができる。As still another method of forming the bearing device, the vicinity of the end of the conventional bearing shown in FIGS.
May be formed. For example, a plurality of convex portions 5 and concave portions 4 are alternately formed in advance on the inner peripheral surface of the bearing 13 in the same manner as before, and then, as shown in FIG. After the guide jig 14 is inserted, the blade of the shaping punch 12 may be bitten into the upper end of the bearing 13 to be plastically deformed. Also, for example, as shown in FIG. 9B, the end of the bearing 16 is formed in a thin cylindrical portion 17, and
After inserting a guide jig having a predetermined outer diameter into the center hole 2 of the bearing 16, the cylindrical portion 17 is narrowed down by a shaping punch 15 having an inner hole slightly smaller than the outer diameter of the cylindrical portion 17 of the bearing 16. It may be plastically deformed. In such a forming method, since a method of plastically deforming the upper end of the bearing with a shaping punch is used, the dimensional accuracy of the protrusion 7 is improved, and a high-quality bearing device can be obtained.
【００２５】以上説明したように、軸受３の開口部の少
なくとも一端側に円環状の突出部を形成することによ
り、軸受３の内部からの油漏れは飛躍的に減少する。し
かし、回転軸を軸受３の中心孔２に挿入する場合、円環
状の突出部７により軸受３の内部が気密となるため、回
転軸の挿入が阻害され、組み立ての作業性が低下する難
点がある。このような難点を解消した軸受装置の実施例
として次のようなものがある。As described above, by forming an annular protrusion at at least one end of the opening of the bearing 3, oil leakage from the inside of the bearing 3 is drastically reduced. However, when the rotary shaft is inserted into the center hole 2 of the bearing 3, the inside of the bearing 3 becomes airtight due to the annular projecting portion 7, so that the insertion of the rotary shaft is hindered and the workability of assembly is reduced. is there. The following is an example of a bearing device that solves such a problem.
【００２６】図１０において、基板２５上にはスラスト
軸受２４が取付けられている。スラスト軸受２４の外周
にはフランジ２４ａが形成されている。スラスト軸受２
４の外周には筒状の軸受２２が取付けられている。図示
されない取付けねじの頭部が軸受２２の段部２２ａを押
し付けることにより、軸受２２の下部は、基板２５上に
取付けられるとともに、スラスト軸受２４のフランジ２
４ａと当接し、スラスト軸受２４を基板２５上に押さえ
付けながら固定している。軸受２２の中心孔には図示し
ないが、前述した実施例と同様に軸線方向に凸部と凹部
が複数個、しかも交互に形成されている。また、軸受２
２の上端部には環状の突出部が形成されている。軸受２
２下部の、フランジ２４ａを押さえている箇所の一部に
は、図１１に示すような端面溝２６が半径方向に形成さ
れており、この端面溝２６によって軸受２２内部空間と
外部は連通している。このような軸受２２の中心孔には
回転軸２１が挿入され、回転軸２１はスラスト軸受２４
によってスラスト方向に支持されるとともに、軸受２２
によってラジアル方向に支持され、回転自在となってい
る。In FIG. 10, a thrust bearing 24 is mounted on a substrate 25. A flange 24a is formed on the outer periphery of the thrust bearing 24. Thrust bearing 2
A cylindrical bearing 22 is attached to the outer periphery of the cylinder 4. When the head of a mounting screw (not shown) presses the step 22 a of the bearing 22, the lower portion of the bearing 22 is mounted on the substrate 25 and the flange 2 of the thrust bearing 24.
The thrust bearing 24 is fixed to the substrate 25 while being pressed against the substrate 25. Although not shown, a plurality of convex portions and concave portions are formed in the center hole of the bearing 22 in the axial direction similarly to the above-described embodiment, and are alternately formed. Also, bearing 2
An annular protruding portion is formed at the upper end of 2. Bearing 2
An end face groove 26 as shown in FIG. 11 is formed in a part of the lower part of the portion where the flange 24a is pressed, as shown in FIG. 11, and the inner space and the outside of the bearing 22 communicate with each other by the end face groove 26. I have. The rotating shaft 21 is inserted into the center hole of the bearing 22, and the rotating shaft 21
Supported in the thrust direction by the
And is rotatable in the radial direction.
【００２７】以上のような軸受装置は、軸受２２の内部
が下部に形成された端面溝２６によって外側の空間と連
通している。このため、回転軸２１を軸受２２の中心孔
に挿入する場合も軸受２２の内部空間が気密とならず、
端面溝２６を通じて空気が抜けるため、スムーズに回転
軸２１を取付けることができ、組み立て作業性を飛躍的
に向上させることができる。In the above-described bearing device, the inside of the bearing 22 communicates with the outer space by the end face groove 26 formed at the lower part. Therefore, even when the rotating shaft 21 is inserted into the center hole of the bearing 22, the internal space of the bearing 22 does not become airtight,
Since air escapes through the end face groove 26, the rotation shaft 21 can be smoothly attached, and the assembling workability can be greatly improved.
【００２８】また、以上のような構成に加えて、図１２
に示すように、スラスト軸受２４を樹脂で形成するとと
もに、フランジ２４ａの外周側の特定箇所に可撓性ある
いは弾性を有する舌片部２８を一体に有するような構成
にしてもよい。舌片部２８は、予め端面溝２６の周方向
寸法と同じになるように設定されているため、図１３に
示すような軸受装置を構成した場合、端面溝２６に舌片
部２８が嵌まり合うとともに、舌片部２８の上端面が端
面溝２６の端面と当接し、軸受２２内部の空間が外部空
間と遮断され気密となる。Further, in addition to the above configuration, FIG.
As shown in FIG. 7, the thrust bearing 24 may be made of resin, and a flexible or elastic tongue piece 28 may be integrally formed at a specific location on the outer peripheral side of the flange 24a. Since the tongue piece 28 is set in advance to be the same as the circumferential dimension of the end face groove 26, the tongue piece 28 fits into the end face groove 26 when a bearing device as shown in FIG. At the same time, the upper end surface of the tongue piece 28 comes into contact with the end surface of the end face groove 26, and the space inside the bearing 22 is cut off from the external space to be airtight.
【００２９】しかし、このような軸受装置の軸受２２に
回転軸２１を挿入することにより、図１４に示すよう
に、軸受２２内部の空気が圧縮され、圧縮された空気が
舌片部２８を押して撓ませるため、軸受２２の内部の空
間と外部の空間が連通し、空気が外部に放出されるた
め、回転軸２１をスムーズに取付けることができる。However, by inserting the rotating shaft 21 into the bearing 22 of such a bearing device, the air inside the bearing 22 is compressed as shown in FIG. Due to the bending, the space inside the bearing 22 communicates with the space outside, and the air is released to the outside, so that the rotating shaft 21 can be mounted smoothly.
【００３０】回転軸２１を軸受に対して組付けた後は、
空気の放出が終了し、再度舌片部２８が弾性により復帰
して上端面が端面溝２６の端面と当接するため、軸受２
２の内部空間は気密となる。このため、軸受２２に対し
て回転軸２１を取付けた後、回転軸２１が抜けるといっ
た不具合を解消することができる。After assembling the rotating shaft 21 to the bearing,
After the release of air is completed, the tongue piece 28 returns again by elasticity, and the upper end surface comes into contact with the end surface of the end surface groove 26.
The internal space of 2 becomes airtight. Therefore, it is possible to solve the problem that the rotating shaft 21 comes off after the rotating shaft 21 is attached to the bearing 22.
【００３１】舌片部２８は、スラスト軸受２４と一体成
形されたものに限られるものではない。図１５、図１６
に示すように、スラスト軸受２４とは別体の円環状の可
撓性を有する板材３１の外周に舌片部３１ａを形成し
て、スラスト軸受２４のフランジ２４ａと軸受２２の下
端面とで挾持するように構成してもよい。効果はスラス
ト軸受２４と一体のものと同じである。The tongue piece 28 is not limited to one integrally formed with the thrust bearing 24. FIG. 15, FIG.
As shown in FIG. 7, a tongue portion 31a is formed on the outer periphery of an annular flexible plate 31 separate from the thrust bearing 24, and is held between the flange 24a of the thrust bearing 24 and the lower end surface of the bearing 22. May be configured. The effect is the same as that of the thrust bearing 24.
【００３２】また、軸受内部に凹部及び凸部、突出部が
形成されていない場合にも、軸受の一端側の中心孔にス
ラスト軸受が結合されると、軸受の内部が気密となるた
め、回転軸の挿入が阻害され、組み立ての作業性が低下
する難点がある。この問題点も、図１０乃至図１６に沿
って前記した実施例を適用すれば、同様に解消でき、組
み立て作業性を飛躍的に向上することができる。Further, even when no concave, convex, or protruding portion is formed inside the bearing, if the thrust bearing is coupled to the center hole on one end side of the bearing, the inside of the bearing becomes airtight, so There is a problem that the insertion of the shaft is hindered and the workability of assembly is reduced. This problem can be similarly solved by applying the embodiment described above with reference to FIGS. 10 to 16, and the assembly workability can be greatly improved.
【００３３】[0033]
【発明の効果】請求項１記載の発明によれば、軸と、中
心孔で軸を支承する焼結含油軸受とを備え、このうちい
ずれか一方が他方に対して回転する軸受装置において、
軸受の中心孔の内周面には、軸方向に均一の幅かつ均一
の深さの凹部と、軸方向に均一の幅かつ均一の高さで上
記軸に摺接可能に臨む凸部とが設けられていると共に、
軸受の開口部の少なくとも一端側の内周には、環状の突
出部が形成されているため、軸受の中心孔から軸受油が
外部へ漏洩するのを防止することができるし、同様に突
出部によって回転軸が回転し始めた際のがたつきを抑え
て、回転軸の芯振れ特性を良好にすることができる。According to the first aspect of the present invention, the shaft and the middle
And a sintered oil-impregnated bearing that supports the shaft with a core hole.
In a bearing device in which either one rotates with respect to the other,
The inner peripheral surface of the center hole of the bearing has a uniform width and uniform in the axial direction.
Recess with a depth of, and a uniform width and height in the axial direction
A projection is provided so as to be slidable on the shaft,
Since an annular projection is formed at least on the inner periphery on one end side of the opening of the bearing, it is possible to prevent the bearing oil from leaking to the outside from the center hole of the bearing. As a result, it is possible to suppress rattling when the rotating shaft starts to rotate, and to improve the center runout characteristics of the rotating shaft.
【００３４】請求項４記載の発明によれば、軸受のスラ
スト軸受側の端面に溝を形成し、スラスト軸受に可撓性
の舌片部を軸受の端面の溝に当接したことにより、回転
軸を挿入する直前は、軸受の内周面は密閉状となってい
るが、回転軸を軸受に押し込むことにより舌片部の軸受
の端面の溝との当接が外れ、軸受の内部空間と外部の空
間が連通し密閉が解除されるため、スムーズに回転軸を
取付けることができる。なお、回転軸を挿入した後は、
舌片部は自らの弾性力によって再び軸受の端面の溝と当
接し、軸受の内周面は密閉されるため軸受油の漏洩は皆
無である。According to the fourth aspect of the present invention, a groove is formed in the end face of the bearing on the thrust bearing side, and the flexible tongue portion abuts the thrust bearing in the groove on the end face of the bearing, thereby rotating the bearing. Immediately before inserting the shaft, the inner peripheral surface of the bearing is sealed, but when the rotating shaft is pushed into the bearing, the contact of the tongue piece with the groove on the end surface of the bearing is released, and the inner space of the bearing is removed. Since the external space communicates and the sealing is released, the rotating shaft can be smoothly mounted. After inserting the rotating shaft,
The tongue piece again comes into contact with the groove on the end face of the bearing by its own elastic force, and the inner peripheral surface of the bearing is sealed, so that there is no bearing oil leakage.
【図１】 本発明にかかる軸受装置に適用される軸受の
実施例を示す上面図。FIG. 1 is a top view showing an embodiment of a bearing applied to a bearing device according to the present invention.
【図２】図１の線Ｂ−Ｂに沿う断面図。FIG. 2 is a sectional view taken along line BB in FIG. 1;
【図３】本発明にかかる軸受装置に適用される軸受のさ
らに別の実施例を示す断面図。FIG. 3 is a sectional view showing still another embodiment of the bearing applied to the bearing device according to the present invention.
【図４】本発明にかかる軸受装置に適用される回転軸の
芯振れ特性を示すグラフ。FIG. 4 is a graph showing runout characteristics of a rotating shaft applied to the bearing device according to the present invention.
【図５】本発明にかかる軸受装置に適用される軸受のさ
らに別の実施例を示す上面図。FIG. 5 is a top view showing still another embodiment of the bearing applied to the bearing device according to the present invention.
【図６】図５の線Ｃ−Ｃに沿う断面図。FIG. 6 is a sectional view taken along line CC of FIG. 5;
【図７】突出部の中心角度による軸受油の漏洩する量を
示すグラフ。FIG. 7 is a graph showing the amount of bearing oil leaking according to the center angle of the protrusion.
【図８】本発明にかかる軸受装置を形成するのに使用さ
れるパンチの例を示す斜視図。FIG. 8 is a perspective view showing an example of a punch used to form the bearing device according to the present invention.
【図９】本発明にかかる軸受装置のさらに別の形成方法
を示す断面図。FIG. 9 is a sectional view showing still another method of forming the bearing device according to the present invention.
【図１０】本発明にかかる軸受装置のさらに別の実施例
を示す断面図。FIG. 10 is a sectional view showing still another embodiment of the bearing device according to the present invention.
【図１１】本発明にかかる軸受装置に適用される軸受の
例を示す斜視図。FIG. 11 is a perspective view showing an example of a bearing applied to the bearing device according to the present invention.
【図１２】本発明にかかる軸受装置に適用されるスラス
ト軸受の例を示す斜視図。FIG. 12 is a perspective view showing an example of a thrust bearing applied to the bearing device according to the present invention.
【図１３】本発明にかかる軸受装置のさらに別の実施例
を示す断面図。FIG. 13 is a sectional view showing still another embodiment of the bearing device according to the present invention.
【図１４】本発明にかかる軸受装置に回転軸を挿入した
例を示す断面図。FIG. 14 is a sectional view showing an example in which a rotating shaft is inserted into the bearing device according to the present invention.
【図１５】本発明にかかる軸受装置に適用可能な板材の
例を示す斜視図。FIG. 15 is a perspective view showing an example of a plate material applicable to the bearing device according to the present invention.
【図１６】本発明にかかる軸受装置のさらに別の実施例
を示す断面図。FIG. 16 is a sectional view showing still another embodiment of the bearing device according to the present invention.
【図１７】従来の軸受装置が適用されるモータの例を示
す断面図。FIG. 17 is a sectional view showing an example of a motor to which a conventional bearing device is applied.
【図１８】従来の軸受装置に適用される軸受の例を示す
上面図。FIG. 18 is a top view showing an example of a bearing applied to a conventional bearing device.
【図１９】図１８の線Ａ−Ａに沿う断面図。FIG. 19 is a sectional view taken along the line AA in FIG. 18;
【図２０】従来の軸受装置の例を示す斜視図。FIG. 20 is a perspective view showing an example of a conventional bearing device.
【図２１】従来の軸受装置に適用される回転軸の芯振れ
特性を示すグラフ。FIG. 21 is a graph showing runout characteristics of a rotating shaft applied to a conventional bearing device.
２ 中心孔 ３ 軸受 ４ 凹部 ５ 凸部 ７ 突出部 2 center hole 3 bearing 4 concave part 5 convex part 7 protruding part
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F16C 17/04 F16C 17/10 F16C 33/10 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F16C 17/04 F16C 17/10 F16C 33/10
Claims (4)
受とを備え、このうちいずれか一方が他方に対して回転
する軸受装置において、 上記軸受の中心孔の内周面には、軸方向に均一の幅かつ
均一の深さの凹部と、軸方向に均一の幅かつ均一の高さ
で上記軸に摺接可能に臨む凸部とが設けられていると共
に、軸受の開口部の少なくとも一端側の内周には、環状
の突出部が形成されていることを特徴とする軸受装置。A bearing device comprising: a shaft; and a sintered oil-impregnated bearing that supports the shaft with a center hole, wherein one of the bearings rotates with respect to the other. The inner peripheral surface has a uniform width in the axial direction and
Recesses of uniform depth, uniform width and uniform height in the axial direction
In conjunction with a protrusion which faces in slidable contact with the shaft is provided, on the inner circumference of the at least one end side of the opening of the bearing, the bearing apparatus characterized by protrusions of the annular is formed.
ていることを特徴とする請求項１記載の軸受装置。 2. The annular projection is partially cut out.
The bearing device according to claim 1, wherein:
に凹部および凸部を形成する工程、軸受の中心孔にガイ
ド治具を挿入してから、軸受の端部を整形パンチによっ
て塑性変形させて環状の突出部を形成する工程を有する
ことを特徴とする軸受装置の製造方法。 3. A punch is press-fitted into a center hole of a bearing to form an inner peripheral surface.
Forming concave and convex parts on
After inserting the jig, insert the end of the bearing with a shaping punch.
Forming a circular projection by plastic deformation
A method for manufacturing a bearing device, comprising:
ラスト軸受が結合されると共に、回転軸を上記焼結含油
軸受に取付ける際に上記焼結含油軸受内部と外気とを連
通させるために、焼結含油軸受のスラスト軸受側の端面
に溝が形成され、この溝にスラスト軸受に設けられた可
撓性の舌片部が当接していることを特徴とする請求項１
記載の軸受装置。 4. A center hole at one end of the sintered oil-impregnated bearing is provided with a gap.
The last bearing is connected and the rotating shaft is
When mounting on the bearing, connect the inside of the sintered oil-impregnated bearing with the outside air.
The end face of the sintered oil-impregnated bearing on the thrust bearing side
A groove is formed in the thrust bearing.
2. A flexible tongue piece is in contact with said tongue.
The bearing device as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2614194A JP2905386B2 (en) | 1994-01-28 | 1994-01-28 | Bearing device and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2614194A JP2905386B2 (en) | 1994-01-28 | 1994-01-28 | Bearing device and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07217646A JPH07217646A (en) | 1995-08-15 |
| JP2905386B2 true JP2905386B2 (en) | 1999-06-14 |
Family
ID=12185275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2614194A Expired - Fee Related JP2905386B2 (en) | 1994-01-28 | 1994-01-28 | Bearing device and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2905386B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7380989B2 (en) | 2004-04-28 | 2008-06-03 | Nidec Corporation | Fluid dynamic pressure bearing and recording disk drive device comprising the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3982706B2 (en) | 2004-06-04 | 2007-09-26 | 株式会社椿本チエイン | Manufacturing method for bushing with oil groove blind groove for chain |
| JP2007218430A (en) * | 2007-03-13 | 2007-08-30 | Tsubakimoto Chain Co | Manufacturing method of bush with oil reservoir blind groove for chain |
-
1994
- 1994-01-28 JP JP2614194A patent/JP2905386B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7380989B2 (en) | 2004-04-28 | 2008-06-03 | Nidec Corporation | Fluid dynamic pressure bearing and recording disk drive device comprising the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07217646A (en) | 1995-08-15 |
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