JPH0372159U - - Google Patents
Info
- Publication number
- JPH0372159U JPH0372159U JP13389389U JP13389389U JPH0372159U JP H0372159 U JPH0372159 U JP H0372159U JP 13389389 U JP13389389 U JP 13389389U JP 13389389 U JP13389389 U JP 13389389U JP H0372159 U JPH0372159 U JP H0372159U
- Authority
- JP
- Japan
- Prior art keywords
- pole piece
- magnetic fluid
- magnetic
- circumferential surface
- edge
- 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.)
- Pending
Links
- 239000011553 magnetic fluid Substances 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 7
- 239000000696 magnetic material Substances 0.000 claims 6
- 230000004907 flux Effects 0.000 claims 4
- 230000035699 permeability Effects 0.000 claims 2
- 238000005452 bending Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
第１〜１１図は本考案の第一〜第十一実施例を
、第１２図は従来構造の１例を、それぞれ示す断
面図、第１３図は従来構造の場合に於いて、磁性
流体を注入する状態を示す断面図である。
１……ハウジング、２……軸、３……磁性流体
シール装置本体、４……内周面、５……外周面、
６……空間、７……永久磁石、８……第一のポー
ルピース、９……第二のポールピース、１０……
磁性流体、１１……転がり軸受、１２……外輪、
１３……スペーサ、１４……板材、１５……微小
隙間、１６……スペーサ、１７……折り曲げ部、
１７ａ……端縁、１８……スペーサ、１９……第
一の隙間、２０……第二の隙間、２１……板材、
２２……微小隙間、２３……スペーサ。
Figures 1 to 11 are cross-sectional views showing the first to eleventh embodiments of the present invention, Figure 12 is a sectional view of an example of a conventional structure, and Figure 13 is a cross-sectional view of the conventional structure. FIG. 3 is a cross-sectional view showing a state of injection. DESCRIPTION OF SYMBOLS 1... Housing, 2... Shaft, 3... Magnetic fluid seal device main body, 4... Inner peripheral surface, 5... Outer peripheral surface,
6... Space, 7... Permanent magnet, 8... First pole piece, 9... Second pole piece, 10...
Magnetic fluid, 11... Rolling bearing, 12... Outer ring,
13...Spacer, 14...Plate material, 15...Minute gap, 16...Spacer, 17...Bend portion,
17a...edge, 18...spacer, 19...first gap, 20...second gap, 21...plate material,
22...Minute gap, 23...Spacer.
Claims (1)
と、この第一部材と同心に設けられ、上記第一部
材に対して相対的に回転する第二部材と、この第
二部材の周面と上記第一部材の周面との間の円筒
状の空間内に挿入自在な大きさを有する円輪状に
形成され、軸方向に亙つて着磁された永久磁石と
、上記円筒状の空間内に挿入自在な大きさを有す
る円輪状に形成され、上記永久磁石の両側面に固
着された第一、第二のポールピースと、第一、第
二の両ポールピースの第一の周縁と上記第一部材
の周面との間に、上記永久磁石の磁力により保持
された磁性流体とから成り、上記永久磁石と上記
第一、第二のポールピースとの内の、少なくとも
１個の部材の第二の周縁を、上記第二部材の周面
に嵌合する事により、上記円筒状の空間の内側で
、上記第一部材と第二部材との相対的回転を自在
とする為の、磁性材製の転がり軸受の近傍部分に
固定した磁性流体シール装置に於いて、上記転が
り軸受に対向する第二のポールピースの第一の周
縁と第一部材の周面との間に存在する磁束の密度
を、清浄空間側に設けた第一のポールピースの第
一の周縁と第一部材の周面との間に存在する磁束
の密度以上とした事を特徴とした磁性流体シール
装置。 (2) 第二部材の周面に磁性材製で円輪状の板材
を、第一のポールピースに近接させて固定し、こ
の板材の周縁を第一部材の周面に、微小隙間を介
して対向させた、請求項１に記載の磁性流体シー
ル装置。 (3) 板材の第一のポールピースとの間に、非磁
性材製のスペーサを介在させ、このスペーサの透
磁率を変える事で、上記板材を通過する磁束の量
を調節自在とした、請求項２に記載の磁性流体シ
ール装置。 (4) 第一のポールピースの第一の周縁側端部を
Ｌ字形に折り曲げる事により、この第一のポール
ピースの第一の周縁で、第一部材の周面の対向す
る部分の幅寸法を、第二のポールピースの第一の
周縁で、第一部材の周面と対向する部分の幅寸法
よりも広くした、請求項１に記載の磁性流体シー
ル装置。 (5) 第一のポールピースの厚さ寸法を、第二の
ポールピースの厚さ寸法よりも大きくする事で、
上記第一のポールピースの第一の周縁で、第一部
材の周面と対向する部分の幅寸法を、第二のポー
ルピースの第一の周縁で、第一部材の周面と対向
する部分の幅寸法よりも広くした、請求項１に記
載の磁性流体シール装置。 (6) 永久磁石の側面の幅寸法を、第一のポール
ピース側で狭く、第二のポールピース側で広くし
た、請求項１に記載の磁性流体シール装置。 (7) 第一のポールピースの第二の周縁側を、第
二のポールピース側に向けてＬ字形に折り曲げる
事で折り曲げ部とし、この折り曲げ部の端縁を転
がり軸受の端面に近接させた、請求項１に記載の
磁性流体シール装置。 (8) 折り曲げ部の端縁と転がり軸受との間に、
非磁性材製のスペーサを介在させ、このスペーサ
の透磁率を変える事で、上記折り曲げ部を通過す
る磁束の量を調節自在とした、請求項７に記載の
磁性流体シール装置。 (9) 第一のポールピースの第一の周縁と、第一
部材の周面との間に存在し、磁性流体を保持する
第一の隙間の直径方向に亙る寸法を、第二のポー
ルピースの第一の周縁と、第一部材の周面との間
に存在し、磁性流体を保持する第二の隙間の直径
方向に亙る寸法よりも大きくした、請求項１に記
載の磁性流体シール装置。 (10) 第一部材の周面に磁性材製で円輪状の板材
を固定し、この板材の側面を第一のポールピース
の側面に、微小隙間を介して対向させた、請求項
１に記載の磁性流体シール装置。[Claims for Utility Model Registration] (1) A first member made of a magnetic material having a cylindrical peripheral surface, and a first member that is provided concentrically with the first member and rotates relative to the first member. The second member is formed into a ring shape having a size that can be freely inserted into the cylindrical space between the circumferential surface of the second member and the circumferential surface of the first member, and is magnetized in the axial direction. a permanent magnet; first and second pole pieces formed in a ring shape having a size that can be freely inserted into the cylindrical space and fixed to both sides of the permanent magnet; a magnetic fluid held by the magnetic force of the permanent magnet between the first peripheral edge of both pole pieces and the peripheral surface of the first member, the permanent magnet and the first and second pole pieces. By fitting the second peripheral edge of at least one of the members to the peripheral surface of the second member, the first member and the second member are connected inside the cylindrical space. In a magnetic fluid seal device fixed to the vicinity of a rolling bearing made of magnetic material to allow relative rotation, the first peripheral edge of the second pole piece facing the rolling bearing and the first member The density of the magnetic flux that exists between the circumferential surface of the first pole piece and the circumferential surface of the first member is set to be greater than or equal to the density of the magnetic flux that exists between the first circumferential edge of the first pole piece provided on the clean space side and the circumferential surface of the first member. A magnetic fluid seal device featuring: (2) A circular plate made of magnetic material is fixed to the circumferential surface of the second member in close proximity to the first pole piece, and the circumferential edge of this plate is attached to the circumferential surface of the first member through a small gap. The magnetic fluid seal device of claim 1, wherein the magnetic fluid seal devices are opposed. (3) A claim in which a spacer made of a non-magnetic material is interposed between the plate material and the first pole piece, and by changing the magnetic permeability of this spacer, the amount of magnetic flux passing through the plate material can be adjusted. Item 2. The magnetic fluid seal device according to item 2. (4) By bending the first peripheral edge side end of the first pole piece into an L-shape, the width dimension of the opposing portion of the peripheral surface of the first member at the first peripheral edge of this first pole piece 2. The magnetic fluid sealing device according to claim 1, wherein: is wider than the width of the first peripheral edge of the second pole piece that faces the peripheral surface of the first member. (5) By making the thickness of the first pole piece larger than the thickness of the second pole piece,
The width of the first circumferential edge of the first pole piece facing the circumferential surface of the first member is the width of the first circumferential edge of the second pole piece facing the circumferential surface of the first member. 2. The magnetic fluid sealing device according to claim 1, wherein the width is wider than the width of the magnetic fluid sealing device. (6) The magnetic fluid seal device according to claim 1, wherein the width of the side surface of the permanent magnet is narrower on the first pole piece side and wider on the second pole piece side. (7) The second peripheral edge side of the first pole piece is bent into an L shape toward the second pole piece to form a bent part, and the edge of this bent part is brought close to the end surface of the rolling bearing. , The magnetic fluid sealing device according to claim 1. (8) Between the edge of the bent part and the rolling bearing,
8. The magnetic fluid sealing device according to claim 7, wherein the amount of magnetic flux passing through the bent portion can be adjusted by interposing a spacer made of a non-magnetic material and changing the magnetic permeability of the spacer. (9) The dimension in the diametrical direction of the first gap that exists between the first circumferential edge of the first pole piece and the circumferential surface of the first member and holds the magnetic fluid is The magnetic fluid sealing device according to claim 1, wherein the magnetic fluid sealing device is larger than a dimension extending in the diametrical direction of the second gap that exists between the first peripheral edge of the first member and the peripheral surface of the first member and retains the magnetic fluid. . (10) According to claim 1, a circular plate made of magnetic material is fixed to the circumferential surface of the first member, and the side surface of this plate is opposed to the side surface of the first pole piece with a small gap therebetween. magnetic fluid seal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13389389U JPH0372159U (en) | 1989-11-20 | 1989-11-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13389389U JPH0372159U (en) | 1989-11-20 | 1989-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0372159U true JPH0372159U (en) | 1991-07-22 |
Family
ID=31681279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13389389U Pending JPH0372159U (en) | 1989-11-20 | 1989-11-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0372159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015152096A (en) * | 2014-02-14 | 2015-08-24 | ミネベア株式会社 | Pivot assembly bearing device and magnetic head drive device using the same |
-
1989
- 1989-11-20 JP JP13389389U patent/JPH0372159U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015152096A (en) * | 2014-02-14 | 2015-08-24 | ミネベア株式会社 | Pivot assembly bearing device and magnetic head drive device using the same |
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