JPS6113021A - Bearing unit - Google Patents

Abstract

PURPOSE:To add preload without giving any deformation to a bearing as well as to secure a highly accurate bearing unit, by installing a rubber ring, being provided with projection parts applying pressure to a circumferential surface of the bearing, in position between the bearing and a housing member holding the circumferential surface of the bearing. CONSTITUTION:A groove 4a is installed in a bearing housing 4 as in concentric circular form with a bearing 3b, and a rubber ring 11 having two projections inside is inserted into this groove 4a. When the bearing 3b is inserted into this rubber ring, a projection part 11a of the rubber ring 11 alone is smashed by a bearing outer ring whereby this bearing outer ring is forcibly pressed to one direction by the resilient force so that a clearance between the bearing outer ring and the housing is eliminated.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、スピンドルの回転精度の向上に係る軸受装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a bearing device that improves the rotation accuracy of a spindle.

〔発明の背景〕[Background of the invention]

従来のディスク駆動装置に於けるスピンドル構造の一例
を第３図を用いて説明する。An example of a spindle structure in a conventional disk drive device will be explained with reference to FIG.

第３図に於いて１は複数枚の磁気ディスクでスピンドル
ハブ２に固定されている。スピンドルハブは上下２ケの
軸受１１ａ、３ｂを介してハウジング４に回転可能に取
付られ、モータマグネット５とモータ巻線６とにより構
成される駆動モータによりスピンドルハブのンヤ７トの
廻りに回転駆動される。スピンドルの回転精度を向上さ
せる為に軸受３ａ、及び３ｂの内輪と外輪との間のラジ
アルすきまを除去してやる必要がるる。その為に軸受３
ｂの外輪とベース４との嵌合部に微小なすきまが設けら
れておシ、予圧ばね７１Ｃよシ軸受外輪に軸方向の予圧
が付加され、その結果各々の軸受けのラジアルすきまが
除去される。前記軸受外輪とベース間のすきまによる回
転精度の低下を防ぐ為に、軸受け３ｂの外輪上の一点を
ばね８によって半径方向に押しつけ、軸受外輪とベース
間のすきまを除去している。In FIG. 3, reference numeral 1 indicates a plurality of magnetic disks fixed to the spindle hub 2. The spindle hub is rotatably attached to the housing 4 via two upper and lower bearings 11a and 3b, and is driven to rotate around the shaft of the spindle hub by a drive motor composed of a motor magnet 5 and a motor winding 6. be done. In order to improve the rotation accuracy of the spindle, it is necessary to eliminate the radial clearance between the inner and outer rings of the bearings 3a and 3b. For that purpose, bearing 3
A minute clearance is provided at the fitting part between the outer ring of b and the base 4, and axial preload is applied to the bearing outer ring by the preload spring 71C, and as a result, the radial clearance of each bearing is removed. . In order to prevent a decrease in rotation accuracy due to the clearance between the bearing outer ring and the base, a spring 8 presses a point on the outer ring of the bearing 3b in the radial direction to eliminate the clearance between the bearing outer ring and the base.

しかし、この構造では軸受とベース間のすきまを除去す
るために、ばねで一方向から軸受外輪を押しているため
、軸受外輪の変形が起こυやすく、回転精度を低下させ
る原因となっている。However, in this structure, in order to eliminate the gap between the bearing and the base, a spring pushes the bearing outer ring from one direction, which tends to cause deformation of the bearing outer ring, causing a reduction in rotational accuracy.

さらに第３図Ｃ（おいて、軸受６ｂの外輪は、ばね８に
て横方向に自由に移動することが必要であるが、予圧ば
ね７が軸受外輪を直接弁しているため、予圧はね７とハ
ウジング４が接触したとき、軸受外輪の移動は予圧ばね
７により阻害され、軸受外輪とハウジングの接触が妨げ
られる恐れがある。Furthermore, in FIG. 3C, the outer ring of the bearing 6b needs to be able to move freely in the lateral direction by the spring 8, but since the preload spring 7 directly valves the bearing outer ring, the preload does not When the bearing outer ring 7 and the housing 4 come into contact with each other, the movement of the bearing outer ring is inhibited by the preload spring 7, and there is a possibility that contact between the bearing outer ring and the housing is prevented.

尚、この様なスピンドル構造は、特開昭５８−１８４３
１８号公報に記載されている。Incidentally, such a spindle structure was disclosed in Japanese Patent Application Laid-Open No. 58-1843.
It is described in Publication No. 18.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、前記の如き従来の問題点を除去するも
のであり、軸受に変形を与えることなくして予圧を与え
、かつ軸受とペースとの嵌合部のすきまを安定に除去し
て高精度な回転を可能ならしめる軸受装置を提供するこ
とにある。The purpose of the present invention is to eliminate the above-mentioned conventional problems, and to provide a preload without deforming the bearing, and to stably eliminate the gap between the fitting part of the bearing and the pace, thereby achieving high performance. An object of the present invention is to provide a bearing device that enables accurate rotation.

〔発明の概要〕[Summary of the invention]

本発明の軸受装置、の特徴とするところは、軸受ハウジ
ングと軸受外輪のすきまを除去するため、凸起付ゴム状
リングにて、軸受外輪を・・ウジングに押し、付けると
共に、押し付は力を２点以上に分散させ軸受の外輪の変
形を小さくする事を可能ならしめるものである。さ、ら
に軸受外輪の横方向の移動を容易ならしめるため、軸受
外輪Ｖζキャップ状のリングを設け、予圧ばねとハウジ
ングの接触を防止するものである。The feature of the bearing device of the present invention is that, in order to eliminate the gap between the bearing housing and the bearing outer ring, the bearing outer ring is pressed against the housing using a raised rubber ring. This makes it possible to reduce the deformation of the outer ring of the bearing by distributing it to two or more points. Furthermore, in order to facilitate the lateral movement of the bearing outer ring, a cap-shaped ring is provided on the bearing outer ring Vζ to prevent the preload spring from coming into contact with the housing.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例′５ｒ：第１図を用いて説明す
る。前記第６図と同一記号のものは同一のものを示す。Embodiment '5r of the present invention will be described below with reference to FIG. Components having the same symbols as those in FIG. 6 above indicate the same components.

本図はスピンドルの断面図である。軸受ハウジング４に
は溝４ａが軸受３ｂと同心円状に設けられている。この
溝に第２図に示すような内側に２個の凸起を持ったゴム
リング１１を挿入する。さらに軸受３ｂを挿入するとゴ
ムリング１１の凸起部１１−ａのみが軸受外輪によって
、つぶされその反発力によって、軸受外輪をハウジング
の一方向に押し付け、軸受外輪とハウジングの間のすき
まを除去する機構となっている。This figure is a sectional view of the spindle. A groove 4a is provided in the bearing housing 4 so as to be concentric with the bearing 3b. A rubber ring 11 having two protrusions on the inside as shown in FIG. 2 is inserted into this groove. When the bearing 3b is further inserted, only the protrusion 11-a of the rubber ring 11 is crushed by the bearing outer ring, and the repulsive force pushes the bearing outer ring in one direction of the housing, eliminating the gap between the bearing outer ring and the housing. It is a mechanism.

ゴムリングの凸起は第１図断面Ａ　−Ａに示すように、
角度θに配置されている。θ＝１２０°　　のとき軸受
外輪に与える変形は一番少なく、軸受の回転精度は低下
しにくい。The protrusions on the rubber ring are as shown in cross section A-A in Figure 1.
It is arranged at an angle θ. When θ=120°, the deformation given to the outer ring of the bearing is the least, and the rotation accuracy of the bearing is unlikely to deteriorate.

キャップ１２は軸受３ｂと同心を保つよう、軸受外輪の
外周にはめ込まれている。キャップ１２の上面は予圧バ
ネ７がはめ込まれ、予圧ばね７は軸受６ｂと同心を保つ
ようになっている。このため予圧ばね７はハウジング４
と接触せず、軸受３ｂは横方向に自由に移動可能となっ
ている０ 第５図は本発明による他の実施例である。軸受３ｂの外
輪に溝３ｃを設け、そこに第６図に示すような外側に凸
起を持ったゴムリング１６を挿入する。The cap 12 is fitted onto the outer periphery of the bearing outer ring so as to remain concentric with the bearing 3b. A preload spring 7 is fitted into the upper surface of the cap 12, and the preload spring 7 is kept concentric with the bearing 6b. Therefore, the preload spring 7 is
5 shows another embodiment of the invention. A groove 3c is provided in the outer ring of the bearing 3b, into which a rubber ring 16 having a protrusion on the outside as shown in FIG. 6 is inserted.

本実施例の作用は第１図の実施例と同様でるる。The operation of this embodiment is similar to that of the embodiment shown in FIG.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、凸起を持った簡単な形状のゴムリング
と簡単な形状の溝を設けることで、軸受外輪とハウジン
グの間のすきまを除去できるので、安価で高精度の軸受
構造を提供できる。According to the present invention, by providing a simple shaped rubber ring with protrusions and a simple shaped groove, it is possible to eliminate the gap between the bearing outer ring and the housing, thereby providing an inexpensive and highly accurate bearing structure. can.

さらに凸起を２ケ所以上に設けることにょシ、軸受外輪
の変形を最小限にすることができ、軸受の回転精度の低
下が避けられる。Furthermore, by providing the protrusions at two or more locations, deformation of the outer ring of the bearing can be minimized, and a decrease in rotational accuracy of the bearing can be avoided.

また軸受外輪と予圧ばねの間にキャップ状リングを設け
ることにより、軸受外輪とハウジングの接触を安定なら
しめる。Further, by providing a cap-shaped ring between the bearing outer ring and the preload spring, the contact between the bearing outer ring and the housing is stabilized.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図１ａ）及び＋ｂ）は本発明による軸受構造の一実
施例の縦断面図。第２図は本発明による実施例のゴムリ
ングの見取図。第３図は従来のディスフ駆動装置のスピ
ンドル構造の縦断面図。第４図は第３図のＡ　−Ａ断面
図。第５図は本発明による他の実施例の縦断面図。第６
図は第５図のゴムリングの見取図。 １・・・ＦＢ気ティスク　　　　　２・・・スピンドル
ノ・ブ ３ａ　、　、５ｂ・・・軸受　　　　　３Ｃ・・・ゴム
リング用溝 ４・・・ハウジング　　　　　　４ｃＬ・・・コ゛ムリ
ング用溝 ５−・・モータマグネット　　　６・・・モータ巻線７
・・・予圧ばね　　　　　　　８・・・ばね９．１０・
・・接触点　　　　　１１・・・ゴムリング１１ａ・・
・ゴムリング凸起 １２・・・キャップ状保持部材 １３・・・ゴムリング。 第　Ｉ　Ｎ ／ｌ久 第２図 第３　図 第４−図 第５図 第１四FIGS. 1a) and 1b) are longitudinal sectional views of an embodiment of a bearing structure according to the present invention. FIG. 2 is a sketch of a rubber ring according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view of the spindle structure of a conventional disc drive device. FIG. 4 is a sectional view taken along line A-A in FIG. 3. FIG. 5 is a longitudinal sectional view of another embodiment according to the invention. 6th
The figure is a sketch of the rubber ring shown in Figure 5. 1...FB air disk 2...Spindle knob 3a, , 5b...bearing 3C...groove for rubber ring 4...housing 4cL...groove for comb ring 5-...motor magnet 6...Motor winding 7
...Preload spring 8...Spring 9.10.
...Contact point 11...Rubber ring 11a...
- Rubber ring protrusion 12... Cap-shaped holding member 13... Rubber ring. Figure 2 Figure 3 Figure 4-Figure 5 Figure 14

Claims (4)

【特許請求の範囲】[Claims] （１）軸受と、前記軸受の周面を保持するハウジング部
材と、前記軸受の周面を加圧する凸起部を持つ弾性体と
を有する軸受装置。(1) A bearing device including a bearing, a housing member that holds the peripheral surface of the bearing, and an elastic body having a protrusion that presses the peripheral surface of the bearing. （２）ハウジングに軸受と同心状に溝を設け、その溝部
に２個以上の凸起を有する弾性体を挿入し、凸起部の弾
性作用により、軸受をハウジングに加圧する手段を有す
る特許請求の範囲第４項記載の軸受装置。(2) A patent claim having a means for providing a groove in the housing concentrically with the bearing, inserting an elastic body having two or more protrusions into the groove, and pressurizing the bearing against the housing by the elastic action of the protrusions. 4. The bearing device according to item 4. （３）前記軸受の外輪の外周面に溝を設け、その溝部に
２個以上の凸起を有する弾性体を挿入し、凸起部の弾性
作用により、軸受をハウジングに加圧する手段を有する
特許請求の範囲第１項記載の軸受装置。(3) A patent that includes means for providing a groove on the outer peripheral surface of the outer ring of the bearing, inserting an elastic body having two or more protrusions into the groove, and pressurizing the bearing against the housing by the elastic action of the protrusions. A bearing device according to claim 1. （４）軸受のラジアルすきまを除去する予圧ばねと軸受
の間にキャップ状保持部材を設け、予圧ばねとハウジン
グの接触を防止することを特徴とする特許請求の範囲第
１項記載の軸受装置。(4) The bearing device according to claim 1, characterized in that a cap-shaped holding member is provided between the preload spring that eliminates a radial clearance of the bearing and the bearing to prevent contact between the preload spring and the housing.