JPH0473419A - Magnetism shielding type roller bearing device - Google Patents
Magnetism shielding type roller bearing deviceInfo
- Publication number
- JPH0473419A JPH0473419A JP19571690A JP19571690A JPH0473419A JP H0473419 A JPH0473419 A JP H0473419A JP 19571690 A JP19571690 A JP 19571690A JP 19571690 A JP19571690 A JP 19571690A JP H0473419 A JPH0473419 A JP H0473419A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- bearing
- shielding body
- magnetic field
- rolling
- 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.)
- Granted
Links
- 230000005389 magnetism Effects 0.000 title 1
- 230000005291 magnetic effect Effects 0.000 claims abstract description 63
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 230000004907 flux Effects 0.000 claims abstract description 15
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 8
- 229910000669 Chrome steel Inorganic materials 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 239000011810 insulating material 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
-
- 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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁界中で使用される転がり軸受装置に関し、
特に、転動体の磁界中での回転に伴う渦電流の発生防止
手段に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rolling bearing device used in a magnetic field.
In particular, the present invention relates to means for preventing the generation of eddy currents caused by rotation of rolling elements in a magnetic field.
［従来の技術］
近時、磁気浮上車例えば超電導磁気浮上式リニアモータ
ーカーシステムの開発が進められている。この磁気浮上
式リニアモーターカーにおいては、車体は車上の超電導
磁石と地上コイルに誘導される電流との間の反発力によ
り支持・案内され、リニアモーターにより駆動される。[Prior Art] Recently, magnetic levitation vehicles, such as superconducting magnetic levitation linear motor car systems, have been developed. In this magnetically levitated linear motor car, the car body is supported and guided by the repulsive force between the superconducting magnets on the car and the current induced in the ground coil, and is driven by a linear motor.
しかし、始動時、・低速時に浮力および案内力が不足す
るので、浮上走行まではタイヤ車輪で走行する。このた
め、補助支持用および案内用のゴムタイヤが別に設けら
れている。However, since the buoyancy and guiding force are insufficient at startup and at low speeds, the vehicle runs on tires and wheels until it floats. For this reason, rubber tires for auxiliary support and guidance are separately provided.
このゴムタイヤの車軸は、通常鋼製の転がり軸受で支持
されている。The axle of this rubber tire is usually supported by a rolling bearing made of steel.
上述した軸受は強い磁界中に置かれることになるが、軸
受の転動体が磁束を切って回転すると、回転に伴って転
動体に電磁誘導作用による渦電流が発生する。渦電流は
、転動体の回転を妨げる作用をなすことから軸受トルク
を増大させ、また、渦電流情夫により軸受の温度を上昇
させる。The above-mentioned bearing is placed in a strong magnetic field, but when the rolling elements of the bearing rotate without magnetic flux, eddy currents are generated in the rolling elements due to electromagnetic induction as they rotate. The eddy current acts to prevent the rotation of the rolling elements, thereby increasing the bearing torque, and also increases the temperature of the bearing due to the eddy current.
渦電流の発生は、転動体をセラミックス等の絶縁材料で
形成することにより防止できるが、セラミックス等は高
価なため軸受自体が高価になる。The generation of eddy currents can be prevented by forming the rolling elements with an insulating material such as ceramics, but since ceramics are expensive, the bearing itself becomes expensive.
本発明は上記問題点に鑑みて提案されたもので、その目
的とするところは、磁界中で使用した場合に、転動体の
回転に伴う渦電流の発生がなく、しかも安価に製作でき
る転がり軸受装置を提供することにある。The present invention has been proposed in view of the above problems, and its purpose is to provide a rolling bearing that does not generate eddy currents due to the rotation of rolling elements when used in a magnetic field, and that can be manufactured at low cost. The goal is to provide equipment.
〔課題を解決するための手段］
本発明では、軸受の少なくとも磁界方向の端面側を、強
磁性材料からなる磁気遮蔽体で被った。[Means for Solving the Problems] In the present invention, at least the end face side of the bearing in the direction of the magnetic field is covered with a magnetic shield made of a ferromagnetic material.
（作用〕
強磁性材料からなる磁気遮蔽体は、磁界中に置かれると
磁界の方向に強く磁化する性質を有する。本発明は、こ
の磁気遮蔽体で、軸受の少なくとも磁界方向の端面側を
被い、磁界中の磁束が転動体に及ばないようにしたもの
である。即ち、磁束は磁気遮蔽体に当たると、磁気遮蔽
体が強磁性を有するため、磁気遮蔽体内を通って軸受外
部に抜けてゆき、転動体には当たらない。このため、転
動体が回転によって磁束を切ることがなくなり、前述し
た渦電流の発生が防止される。(Function) A magnetic shield made of a ferromagnetic material has the property of being strongly magnetized in the direction of the magnetic field when placed in a magnetic field. The magnetic flux in the magnetic field is prevented from reaching the rolling elements.In other words, when the magnetic flux hits the magnetic shield, it passes through the magnetic shield and escapes to the outside of the bearing because the magnetic shield has ferromagnetism. As the magnetic flux moves, it does not hit the rolling elements.Therefore, the rolling elements do not cut the magnetic flux due to rotation, and the generation of the eddy current described above is prevented.
〔実施例〕
以下、本発明の実施例を図面に基づいて説明する。第１
図は、本発明に係る磁気遮蔽転がり軸受を示す。この軸
受は、内輪（１）、外輪（２）、内・外輪（１）（２）
間に介在する複数の転動体（３）、転動体（３）を所定
間隔に保持するための保持器（４）、および軸受の外径
面（２ｂ）から両端面（２ａ） （２ｃ）に延びる磁
気遮蔽体（５）を有する。磁気遮蔽体（５）は、強磁性
材料、例えば軟鋼、クロム鋼等で形成されており、本実
施例では中央部でニラ割りにしたものを用いている。[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure shows a magnetically shielded rolling bearing according to the invention. This bearing has an inner ring (1), an outer ring (2), and inner and outer rings (1) (2).
A plurality of rolling elements (3) interposed between, a retainer (4) for holding the rolling elements (3) at a predetermined interval, and a bearing from the outer diameter surface (2b) to both end surfaces (2a) (2c). It has an extending magnetic shield (5). The magnetic shield (5) is made of a ferromagnetic material, such as mild steel or chrome steel, and in this embodiment, the magnetic shield (5) is split in the center.
そして、このニラ割りにした磁気遮蔽体（５）を両側か
ら夫々軸受に嵌挿して、ハウジング（６）で固定しであ
る。したがって、転動体（３）は、磁気遮蔽体（５）に
よって軸受の外径面および両端面側から包囲される。Then, the magnetic shield (5) cut into strips is fitted into the bearings from both sides and fixed with the housing (6). Therefore, the rolling elements (3) are surrounded by the magnetic shield (5) from the outer diameter surface and both end surfaces of the bearing.
いま、この軸受が同図に矢印で示す方向の磁界中に置か
れた場合を想定すると、磁束（７）は磁気遮蔽体（５）
の一方の端部（５ａ）に当たり、端部（５ａ）および外
径部（５ｂ）を通って他方の端部（５ｃ）に流れる。そ
して端部（５Ｃ）から軸受外部に抜けてゆく。このため
、転動体（３）には磁束（７）が及ばない。換言すれば
、磁気遮蔽体（５）は転動体（３）を包囲する磁気回路
を形成し、磁束はこの磁気回路を転動体を避けるように
流れる。Now, assuming that this bearing is placed in a magnetic field in the direction shown by the arrow in the same figure, the magnetic flux (7) will be transferred to the magnetic shield (5).
and flows through the end (5a) and the outer diameter (5b) to the other end (5c). Then, it exits from the end (5C) to the outside of the bearing. Therefore, the magnetic flux (7) does not reach the rolling element (3). In other words, the magnetic shield (5) forms a magnetic circuit surrounding the rolling element (3), and the magnetic flux flows through this magnetic circuit so as to avoid the rolling element.
第２図は内径面（２ｄ）から両端面（２ａ） （２ｃ
）に延びる磁気遮蔽体（５）を用いた実施例を示す。Figure 2 shows from the inner diameter surface (2d) to both end surfaces (2a) (2c
) shows an example using a magnetic shield (5) extending to
第３図はハウジング（６）から磁界方向の端面（２ａ）
に延びる磁気遮蔽体（５）を用いた実施例を示す。この
場合、磁束（７）は磁気遮蔽体（５）を通ってハウジン
グ（６）側に抜ける。Figure 3 shows the end face (2a) in the magnetic field direction from the housing (6).
An example is shown in which a magnetic shield (5) is used. In this case, the magnetic flux (7) passes through the magnetic shield (5) and exits toward the housing (6).
第４図は軸（８）側から磁界方向の端面（２ａ）に延び
る磁気遮蔽体（５）を用いた実施例を示す、この場合、
磁束（７）は磁気遮蔽体（５）を通って軸（８）側に抜
ける。FIG. 4 shows an embodiment using a magnetic shield (5) extending from the shaft (8) side to the end face (2a) in the magnetic field direction. In this case,
The magnetic flux (7) passes through the magnetic shield (5) and exits toward the shaft (8).
尚、以上の実施例では深溝玉軸受を例示したが、本発明
はこれに限定されず、広く転がり軸受−般、例えば第５
図に示す円すいころ軸受等にも適合する。Although deep groove ball bearings have been exemplified in the above embodiments, the present invention is not limited thereto, and can be broadly applied to rolling bearings in general, for example,
Also suitable for tapered roller bearings shown in the figure.
本発明に係る磁気遮蔽転がり軸受装置は、強磁性材料か
らなる磁気遮蔽体が転動体を包囲する磁気回路を形成す
るため、磁束が転動体に及ぶことがない。このため、転
動体の回転に伴う渦電流の発生がなく、従来問題とされ
ていた渦電流による軸受トルクの増大、温度上昇といっ
た弊害が解消される。In the magnetically shielded rolling bearing device according to the present invention, the magnetic shield made of a ferromagnetic material forms a magnetic circuit surrounding the rolling elements, so that magnetic flux does not reach the rolling elements. Therefore, eddy currents are not generated due to the rotation of the rolling elements, and the conventional problems of increased bearing torque and temperature rise due to eddy currents are eliminated.
また、強磁性材料、例えば軟鋼等はセラミックス等に比
べて安価なため、軸受自体の価格が安価になる。Furthermore, since ferromagnetic materials such as mild steel are cheaper than ceramics, the price of the bearing itself becomes cheaper.
第１図、第２図、第３図、第４図、および第５図は、本
発明に係る磁気遮蔽転がり軸受を示す断面図である。1, 2, 3, 4, and 5 are cross-sectional views showing magnetically shielded rolling bearings according to the present invention.
Claims (1)
向の端面側を、強磁性材料からなる磁気遮蔽体で被い、
転動体に磁束が及ばないようにした磁気遮蔽転がり軸受
装置。(1) Covering at least the end face side in the direction of the magnetic field of a rolling bearing placed in a magnetic field with a magnetic shield made of a ferromagnetic material,
A magnetically shielded rolling bearing device that prevents magnetic flux from reaching the rolling elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19571690A JP2866163B2 (en) | 1990-05-30 | 1990-07-23 | Magnetically shielded rolling bearing device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14273090 | 1990-05-30 | ||
| JP2-142730 | 1990-05-30 | ||
| JP19571690A JP2866163B2 (en) | 1990-05-30 | 1990-07-23 | Magnetically shielded rolling bearing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0473419A true JPH0473419A (en) | 1992-03-09 |
| JP2866163B2 JP2866163B2 (en) | 1999-03-08 |
Family
ID=26474647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19571690A Expired - Fee Related JP2866163B2 (en) | 1990-05-30 | 1990-07-23 | Magnetically shielded rolling bearing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2866163B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002040037A (en) * | 2000-07-26 | 2002-02-06 | Ntn Corp | Bearing equipped with rotation sensor and motor |
| US7119465B2 (en) * | 2004-10-08 | 2006-10-10 | Chun-Nan Chio | Magnetic suspension bearing |
| JP2021042783A (en) * | 2019-09-06 | 2021-03-18 | 株式会社不二越 | bearing |
-
1990
- 1990-07-23 JP JP19571690A patent/JP2866163B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002040037A (en) * | 2000-07-26 | 2002-02-06 | Ntn Corp | Bearing equipped with rotation sensor and motor |
| US7119465B2 (en) * | 2004-10-08 | 2006-10-10 | Chun-Nan Chio | Magnetic suspension bearing |
| JP2021042783A (en) * | 2019-09-06 | 2021-03-18 | 株式会社不二越 | bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2866163B2 (en) | 1999-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |