JPH0749613Y2 - Lower cylinder assembly for magnetic recording / reproducing device - Google Patents
Lower cylinder assembly for magnetic recording / reproducing deviceInfo
- Publication number
- JPH0749613Y2 JPH0749613Y2 JP1965290U JP1965290U JPH0749613Y2 JP H0749613 Y2 JPH0749613 Y2 JP H0749613Y2 JP 1965290 U JP1965290 U JP 1965290U JP 1965290 U JP1965290 U JP 1965290U JP H0749613 Y2 JPH0749613 Y2 JP H0749613Y2
- Authority
- JP
- Japan
- Prior art keywords
- lower cylinder
- bearing
- inner diameter
- adhesive
- shaft
- 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
Description
【考案の詳細な説明】 （イ）産業上の利用分野 本考案はVTR、R-DAT等の磁気記録再生装置に使用される
シリンダに関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cylinder used in a magnetic recording / reproducing apparatus such as a VTR or R-DAT.
（ロ）従来の技術 第２図は従来の下シリンダアッセンブリの断面図で、
（１）は下シリンダ、（２）は軸一体型ベアリングで、
軸（３）、上側ベアリング（４）、下側ベアリング
（５）、バネ材（６）からなる。該軸一体型ベアリング
（２）を前記下シリンダ（１）に挿入固定する際、下シ
リンダ（１）のＡ部を焼ばめて上側ベアリング（４）を
固定すると共に、下側ベアリング（５）は接着孔（７）
を接着剤を注入することで接着溝（８）に接着剤を流し
込んで固定していた。(B) Conventional technology Fig. 2 is a sectional view of a conventional lower cylinder assembly.
(1) is the lower cylinder, (2) is the shaft integrated bearing,
It consists of a shaft (3), an upper bearing (4), a lower bearing (5) and a spring material (6). When the shaft-integrated bearing (2) is inserted and fixed in the lower cylinder (1), the upper bearing (4) is fixed by shrinking the portion A of the lower cylinder (1) and the lower bearing (5). Is the adhesive hole (7)
By injecting the adhesive, the adhesive was poured into the adhesive groove (8) and fixed.
（ハ）考案が解決しようとする課題 ところで、第２図に示される下シリンダ（１）のテープ
当接面の表面加工を行なう際には、下シリンダ（１）の
Ｅ部をチャックして行なうのが一般である。(C) Problems to be Solved by the Invention By the way, when the surface of the tape contact surface of the lower cylinder (1) shown in FIG. 2 is processed, the E portion of the lower cylinder (1) is chucked. Is common.
その際には下シリンダの内径はそのチャック力、即ち、
負荷によって歪を残した状態で表面加工され、表面加工
後チェックを外すと、歪の解放が起こり下シリンダの内
径は変形する。At that time, the inner diameter of the lower cylinder is the chucking force, that is,
The surface is machined with a strain left under load, and if the check is removed after the surface machining, the strain is released and the inner diameter of the lower cylinder deforms.
通常、チャックは３点で支持され、内径の真円度を測定
した場合、極端にいうと、３角形となる。表面加工後の
下シリンダ（１）の内径の変形はＥ部をピークにして表
われ、Ａ部では小さく、Ｂ部では下端側の変形は小さい
が、上端側では大きいことがわかる。Normally, the chuck is supported at three points, and when the circularity of the inner diameter is measured, it becomes a triangle in an extreme case. It can be seen that the deformation of the inner diameter of the lower cylinder (1) after the surface processing has a peak at the E portion, is small in the A portion, is small on the lower end side in the B portion, but is large on the upper end side.
尚、この変形量はチャック力と下シリンダの形状、特に
ハウジング部の肉厚で決まる。そのために小型、薄型の
シリンダでの変形量は大きくなる。上記変形によりシリ
ンダの内径精度が悪化すると、ベアリング挿入時に下シ
リンダに対して軸が倒れた状態で係合され、シリンダの
回転精度等に多大な悪影響を及ぼすことになる。The amount of deformation is determined by the chucking force and the shape of the lower cylinder, especially the thickness of the housing. Therefore, the deformation amount becomes large in a small and thin cylinder. If the inner diameter accuracy of the cylinder deteriorates due to the above deformation, the shaft is engaged with the lower cylinder in a tilted state at the time of inserting the bearing, which has a great adverse effect on the rotational accuracy of the cylinder.
（ニ）課題を解決するための手段 本考案は上記課題を解決するためのものであって、ベア
リングとバネ剤からなる軸一体型ベアリングを、下シリ
ンダに挿入固定するように構成した下シリンダアッツセ
ンブリに於いて、ベアリング外輪を下シリンダに接着す
る接着剤を流し込む接着溝の上側の下シリンダ内径をそ
の下側の内径よりも下シリンダ加工時のチャックによる
内径変形を吸収するため若干広くすると共に、接着溝を
ベアリング外輪のスパンに対し、センターより上側に設
けたことを特徴とする磁気記録再生装置の下シリンダア
ッセンブリを提案するものである。(D) Means for Solving the Problems The present invention is to solve the above problems, and a lower cylinder ats configured to insert and fix a shaft-integrated bearing including a bearing and a spring agent into the lower cylinder. In the assembly, slightly lower the inner diameter of the lower cylinder above the adhesive groove for pouring the adhesive that bonds the bearing outer ring to the lower cylinder to absorb the inner diameter deformation of the chuck during machining of the lower cylinder. The present invention proposes a lower cylinder assembly of a magnetic recording / reproducing apparatus, which is characterized in that the adhesive groove is provided above the center with respect to the span of the bearing outer ring.
（ホ）作用 上記手段によると、下シリンダ加工時のチャックによる
下シリンダ内径の変形を吸収することができると共に、
下シリンダ内径の変形の少ない精度の高い部分を広げる
ことができる。(E) Action According to the above means, it is possible to absorb the deformation of the inner diameter of the lower cylinder due to the chuck during machining of the lower cylinder, and
It is possible to widen the highly accurate portion of the inner diameter of the lower cylinder with little deformation.
（ヘ）実施例 第１図に本考案の下シリンダの断面図を示し、以下に説
明する。本考案の下シリンダ（１）の内径はＡ部では従
来と同様上側ベアリング外輪の径（φD3）と焼きばめ寸
法にしており、上側ベアリング（４）はＡ部に焼ばめに
より固定される。(F) Embodiment A sectional view of a lower cylinder of the present invention is shown in FIG. 1 and will be described below. The inner diameter of the lower cylinder (1) of the present invention is the shrink fitting size with the diameter (φD3) of the upper bearing outer ring in the A portion as in the conventional case, and the upper bearing (4) is fixed to the A portion by the shrink fitting. .
また、下側のベアリング（５）の外輪が固定される接着
溝（８）の下方の内径（φD2）はベアリング外輪の径
（φD2′）より若干広くしておき、接着溝（８）の上
方、即ちＦ部の内径（φD1）は下方の内径（φD2）より
さらに広くし、クリアランス（９）を大きくとる。Also, the inner diameter (φD2) below the adhesive groove (8) in which the outer ring of the lower bearing (5) is fixed is made slightly larger than the diameter (φD2 ′) of the outer bearing ring, and the upper part of the adhesive groove (8) is That is, the inner diameter (φD1) of the F portion is made wider than the lower inner diameter (φD2), and the clearance (9) is increased.
従って、下シリンダ（１）のテープ当接面の表面加工を
行なうため、Ｅ部をチャックする際、軸一体型ベアリン
グ（２）の位置規制を行なう部分で、顕著な変形がみら
れる接着溝（８）上方部分の変形量をクリアランス
（９）により吸収できる。Therefore, since the tape abutting surface of the lower cylinder (1) is surface-processed, when the E portion is chucked, a significant deformation is observed in the portion where the position of the shaft-integrated bearing (2) is regulated. 8) The amount of deformation of the upper part can be absorbed by the clearance (9).
即ち、軸一体型ベアリング（２）を下シリンダ（１）に
挿入する際、上側ベアリング（４）はＡ部に焼きばめに
よって固定されるが、Ｂ部に接着によって固定される下
側ベアリング（５）は接着溝（８）上方の下部はフリー
の状態で、接着溝（８）下方のＧ部に対して接着孔
（７）から注入された接着剤によって接着固定されるこ
とになる。That is, when the shaft-integrated bearing (2) is inserted into the lower cylinder (1), the upper bearing (4) is fixed to the portion A by shrink fitting, but is fixed to the portion B by adhesion. In 5), the lower portion above the adhesive groove (8) is free, and the adhesive is injected and fixed to the G portion below the adhesive groove (8) by the adhesive injected from the adhesive hole (7).
また、従来であれば接着溝（８）の両側で位置規制され
ていた軸一体型ベアリング（２）が、接着溝（８）の下
方のＧ部だけで規制されることになり、軸一体型ベアリ
ング（２）を規制するスパンが短かくなってしまう。In addition, the shaft-integrated bearing (2), which has been conventionally position-regulated on both sides of the adhesive groove (8), is now restricted only by the G portion below the adhesive groove (8). The span that regulates the bearing (2) becomes short.
そこで、接着溝（８）の位置を、従来の第２図に示す様
に、下側ベアリング（５）のスパンｈに対し、ほぼ中
央、即ちｈ′＝1/2hであったのに対し、本案では第１図
に示すようにｈ′＞1/2hとなる位置に接着溝（８）を設
けたので、Ｇ部のスパンが長くなり、軸一体型ベアリン
グ（２）の位置規制を十分に行なうことができる。Therefore, as shown in FIG. 2 of the related art, the position of the adhesive groove (8) is approximately at the center of the span h of the lower bearing (5), that is, h ′ = 1 / 2h, whereas In this proposal, as shown in FIG. 1, since the adhesive groove (8) is provided at the position where h '> 1 / 2h, the span of G part becomes long and the position of the shaft integrated bearing (2) is sufficiently regulated. Can be done.
又、接着孔（７）から接着剤を注入し、下側のベアリン
グ（５）が固着される際、接着剤が接着溝（８）におさ
まりきらず、クリアランス（９）に流れ込みＥ部に吹き
出してベアリング（５）、バネ材（６）等に流れ込み悪
影響を及ぼす心配があるが、接着溝の深さを30μｍ程度
にしておけば極端に接着溝（８）の上方部分、即ちＦ部
のスパンを極端に短かくしない限り、接着剤注入時の圧
力差により若干Ｆ部へ流入してもＥ部にまでは至らな
い。Also, when the adhesive is injected from the adhesive hole (7) and the lower bearing (5) is fixed, the adhesive does not fit in the adhesive groove (8) and flows into the clearance (9) and blows to the E portion. There is a concern that it may flow into the bearing (5), spring material (6), etc. and have an adverse effect. Unless it is made extremely short, even if it slightly flows into the F portion due to the pressure difference when the adhesive is injected, it does not reach the E portion.
尚、本考案では、例えばＦ部での変形量が１μｍ程度で
あると推定されると、ベアリング外輪径φ6.450〜6.454
mmのシリンダの場合、Ｇ部はφ6.451〜6.454mmで、Ｆ部
はφ6.454〜6.457mmとする。In the present invention, if the deformation amount at the F portion is estimated to be about 1 μm, the outer diameter of the bearing is φ6.450 to 6.454.
In the case of a cylinder of mm, the G part is φ6.451 to 6.454 mm and the F part is φ6.454 to 6.457 mm.
（ト）考案の効果 本考案によると、下シリンダ加工時のチャックによって
下シリンダの内径が変形しても、下シリンダ内径の変形
量の著しい部分（Ｆ部）にクリアランスを設けること
で、その変形を吸収でき、軸一体型ベアリングの挿入の
精度を向上させることが出来るものである。又、変形量
の少ない高精度な部分（Ｇ部）を大きくとるように構成
したので、軸一体型ベアリングの位置規制は、その高精
度な部分を利用して軸倒れの少ない高精度な下シリンダ
アッセンブリを提供することができる。(G) Effect of the Invention According to the present invention, even if the inner diameter of the lower cylinder is deformed by the chuck during machining of the lower cylinder, the deformation is provided by providing a clearance in a portion (F portion) where the inner cylinder is significantly deformed. Can be absorbed and the accuracy of insertion of the shaft-integrated bearing can be improved. Further, since the high precision portion (G portion) with a small deformation amount is configured to be large, the position regulation of the shaft-integrated bearing is performed by utilizing the high precision portion, which is a high precision lower cylinder with less shaft tilt. An assembly can be provided.
第１図は本考案の下シリンダアッセンブリを示す断面
図、第２図は従来の下シリンダアッセンブリを示す断面
図、第３図は下シリンダ加工時のチャックによる下シリ
ンダ内径の変形量を示す図である。 （１）……下シリンダ、（２）……軸一体型ベアリン
グ、（３）……軸、（４）……上側ベアリング、（５）
……下側ベアリング、（６）……バネ材、（７）……接
着孔、（８）……接着溝、（９）……クリアランス。FIG. 1 is a sectional view showing a lower cylinder assembly of the present invention, FIG. 2 is a sectional view showing a conventional lower cylinder assembly, and FIG. 3 is a diagram showing a deformation amount of a lower cylinder inner diameter by a chuck during machining of a lower cylinder. is there. (1) …… Lower cylinder, (2) …… Shaft integrated bearing, (3) …… Shaft, (4) …… Upper bearing, (5)
...... Lower bearing, (6) …… Spring material, (7) …… Adhesive hole, (8) …… Adhesive groove, (9) …… Clearing.
Claims (1)
リングを、下シリンダに挿入固定するように構成した下
シリンダアッセンブリに於いて、 ベアリング外輪を下シリンダに接着する接着剤を流し込
む接着溝の上側の下シリンダ内径をその下側の内径より
も下シリンダ加工時のチャックによる内径変形を吸収す
るため若干広くすると共に、 接着溝をベアリング外輪のスパンに対し、センターより
上側に設けたことを特徴とする磁気記録再生装置の下シ
リンダアッセンブリ。1. A lower cylinder assembly configured to insert and fix a shaft-integrated bearing composed of a bearing and a spring member into a lower cylinder, the upper side of a bonding groove into which an adhesive for bonding a bearing outer ring to the lower cylinder is poured. The inner diameter of the lower cylinder is made slightly wider than the inner diameter of the lower cylinder to absorb the inner diameter deformation due to the chuck during machining of the lower cylinder, and the adhesive groove is provided above the center with respect to the span of the bearing outer ring. Lower cylinder assembly for magnetic recording / reproducing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1965290U JPH0749613Y2 (en) | 1990-02-28 | 1990-02-28 | Lower cylinder assembly for magnetic recording / reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1965290U JPH0749613Y2 (en) | 1990-02-28 | 1990-02-28 | Lower cylinder assembly for magnetic recording / reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03110624U JPH03110624U (en) | 1991-11-13 |
| JPH0749613Y2 true JPH0749613Y2 (en) | 1995-11-13 |
Family
ID=31522760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1965290U Expired - Fee Related JPH0749613Y2 (en) | 1990-02-28 | 1990-02-28 | Lower cylinder assembly for magnetic recording / reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749613Y2 (en) |
-
1990
- 1990-02-28 JP JP1965290U patent/JPH0749613Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03110624U (en) | 1991-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |