JPH06147231A - Electric insulating bearing - Google Patents
Electric insulating bearingInfo
- Publication number
- JPH06147231A JPH06147231A JP4254404A JP25440492A JPH06147231A JP H06147231 A JPH06147231 A JP H06147231A JP 4254404 A JP4254404 A JP 4254404A JP 25440492 A JP25440492 A JP 25440492A JP H06147231 A JPH06147231 A JP H06147231A
- Authority
- JP
- Japan
- Prior art keywords
- outer ring
- bearing
- thin film
- insulating
- insulating thin
- 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
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
- 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
-
- 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
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
- Rolling Contact Bearings (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は電気絶縁性に優れた軸受
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing having excellent electric insulation.
【0002】[0002]
【従来の技術】軸受として、外輪と内輪との間に転動体
が介装されたものは一般に知られている。回転電機にお
いては、主電動機の回転軸受が電気的に絶縁遮蔽されて
いない場合、金属製の軸受を介して主電動機枠から電機
子軸との間にて軸電流が流れ、軸受を損傷または焼損し
やすくなる。そのため、この軸電流を遮蔽して主電動機
軸受部の損傷を防止するための技術として、軸受にセラ
ミック加工を施したもの(実開昭60−161721号
公報、特開昭59−103023号公報、特願昭53−
81459号公報、実開昭59−173467号公報参
照)や高分子絶縁材料を軸受外輪に介装したもの(実開
昭54−105408号公報、実開昭58−33820
号公報参照)が提案されている。2. Description of the Related Art A bearing in which a rolling element is interposed between an outer ring and an inner ring is generally known. In rotating electrical machines, if the rotary bearing of the main motor is not electrically insulated and shielded, shaft current flows from the main motor frame to the armature shaft through a metal bearing, damaging or burning the bearing. Easier to do. Therefore, as a technique for blocking the shaft current to prevent damage to the bearing portion of the main motor, the bearing is ceramic processed (Japanese Utility Model Laid-Open No. 60-161721 and Japanese Patent Laid-Open No. 59-103023). Japanese Patent Application No. 53-
No. 81459, Japanese Utility Model Laid-Open No. 59-173467) and a polymer insulating material interposed in a bearing outer ring (Japanese Utility Model Laid-Open No. 54-105408, Japanese Utility Model Laid-Open No. 58-33820).
(See Japanese Patent Publication).
【0003】また、ガラス繊維入りポリフェニレンサル
ファイド(PPS)またはガラス繊維入りナイロンから
なる絶縁被膜を有する絶縁軸受(特開平3−27781
8号公報、実開平3−121222号公報参照)が提案
されている。An insulating bearing having an insulating coating made of glass fiber-containing polyphenylene sulfide (PPS) or glass fiber-containing nylon (Japanese Patent Laid-Open No. 3-27781).
No. 8 and Japanese Utility Model Laid-Open No. 3-122222) are proposed.
【0004】さらに、外輪本体と、この外輪本体の外周
部を覆う絶縁性薄膜と、この絶縁性薄膜の外面に設けら
れた薄肉金属板とを一体的に成形した電気絶縁軸受(特
開平3−103615号公報参照)が提案されている。Further, an electrically insulating bearing is formed by integrally forming an outer ring main body, an insulating thin film covering the outer peripheral portion of the outer ring main body, and a thin metal plate provided on the outer surface of the insulating thin film (Japanese Patent Application Laid-Open No. Hei 3 (1998) -304). Japanese Patent Laid-Open No. 103615) is proposed.
【0005】[0005]
【発明が解決しようとする課題】一般に主電動機の軸受
には高い寸法精度が要求されるが、絶縁部材を施した軸
受は、軸受そのものの寸法精度が得られず、主電動機ハ
ウジングへの組付けにより組付寸法精度が低くなる。こ
の寸法精度が悪くなる欠点を改良したのが、上記したセ
ラミック加工を施した軸受であるが、セラミック自身の
脆さは拭いきれず、また、組付けた後でなければ、主電
動機ハウジングと軸受との間の絶縁性を評価することが
できない。また、高分子絶縁材料を用いる場合、この高
分子部材自体の寸法精度が低い。さらに、軸負荷時の歪
み量を小さくする観点から薄肉にされるが、そのため、
取付け時あるいは取外し時にセラミック材または高分子
材が損傷することがある。また、ナイロンは吸湿により
寸法変化しやすく、PPSは振動などの外力が加わった
場合の耐衝撃性に欠けるという欠点がある。さらに、単
に外輪本体と絶縁性薄膜と薄肉金属板とを一体に成形し
ただけのものでは、寸法安定性に優れた電気絶縁軸受を
得ることはできない。本発明は従来の技術の有するこの
ような問題点に鑑みてなされたものであって、その目的
は、寸法安定性および耐衝撃性に優れ、取付けが容易で
絶縁性が評価しやすく且つ絶縁材料が損傷しにくい構造
の電気絶縁軸受を提供することにある。Generally, a bearing of a main electric motor is required to have high dimensional accuracy. However, a bearing provided with an insulating member cannot obtain the dimensional accuracy of the bearing itself, and therefore the bearing is assembled to the main electric motor housing. As a result, the assembly dimensional accuracy becomes low. It is the above-mentioned ceramic-processed bearing that has improved this dimensional accuracy deterioration, but the brittleness of the ceramic itself cannot be wiped off, and the main motor housing and bearing cannot be wiped unless assembled. Insulation between and cannot be evaluated. Further, when a polymer insulating material is used, the dimensional accuracy of the polymer member itself is low. Furthermore, from the viewpoint of reducing the amount of strain under axial load, it is made thinner, so
Ceramic or polymer material can be damaged during installation or removal. Further, nylon has a drawback that its dimensions are likely to change due to moisture absorption, and PPS lacks impact resistance when an external force such as vibration is applied. Furthermore, it is impossible to obtain an electrically insulated bearing having excellent dimensional stability simply by integrally molding the outer ring body, the insulating thin film and the thin metal plate. The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide excellent dimensional stability and impact resistance, easy attachment, and easy evaluation of insulating property, and an insulating material. The purpose of the present invention is to provide an electrically insulated bearing having a structure that is not easily damaged.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に本発明の要旨は、外輪と内輪との間に転動体が介装さ
れた電気絶縁軸受であって、上記外輪は、転動体が転動
する軌道を有する金属製の外輪本体と、この外輪本体の
ハウジングに取り付けられる部位を被覆するポリアミド
とPPSとのアロイ化材料よりなる0.1〜2.0mm厚
みの絶縁性薄膜と、この絶縁性薄膜の外面に設けられた
薄肉金属板とが一体に成形されてなることを特徴とする
電気絶縁軸受にある。In order to achieve the above object, the gist of the present invention is an electrically insulated bearing having a rolling element interposed between an outer ring and an inner ring, wherein the outer ring has a rolling element. A metal outer ring body having a rolling track, an insulating thin film having a thickness of 0.1 to 2.0 mm and made of an alloyed material of polyamide and PPS for covering a portion of the outer ring body to be attached to a housing, and An electrically insulating bearing is characterized by being integrally molded with a thin metal plate provided on the outer surface of an insulating thin film.
【0007】[0007]
【作用】本発明に係る軸受においては、外輪が外輪本体
と絶縁性薄膜と薄肉金属板とを一体に成形しているた
め、外輪自体がハウジング側と電気的に絶縁するための
絶縁性を有するものであり、軸受をハウジングに組付け
る前に外輪本体と薄肉金属板との間の電気抵抗を測定す
ることによって、その絶縁性を評価することができる。
そして、軸受とハウジングとの間に電気的絶縁を図るた
めの余分な介装物を設ける必要がないから、軸受の組付
けが容易であると共に、軸受部の寸法精度を高くするこ
とが容易である。この場合、絶縁性薄膜はそれ自体の厚
さが薄いため、負荷による歪み量が小さく、寸法精度へ
の影響を無視することができる。また、薄肉金属板の加
工によって外輪の寸法を容易に調整することができる。
さらに、薄肉金属板はハウジングへの取付け時において
絶縁性薄膜に外傷を生じないようこれを保護すると共
に、使用時の負荷によって絶縁性薄膜が破壊することを
防止する。そして、絶縁性薄膜がポリアミドとPPSか
らなるので、寸法安定性および耐衝撃性に優れている。
また、この薄膜の厚みを0.1mm以上とすることにより
所望の電気絶縁性を得ることができ、この厚さを2.0
mm以下とすることにより使用時の負荷による歪み量を抑
制することができる。In the bearing according to the present invention, since the outer ring is integrally formed with the outer ring body, the insulating thin film and the thin metal plate, the outer ring itself has an insulating property for electrically insulating from the housing side. The insulation can be evaluated by measuring the electric resistance between the outer ring body and the thin metal plate before the bearing is assembled to the housing.
Further, since it is not necessary to provide an extra interposition for electrical insulation between the bearing and the housing, the bearing can be easily assembled and the dimensional accuracy of the bearing can be easily increased. is there. In this case, since the insulating thin film itself has a small thickness, the strain amount due to the load is small, and the influence on the dimensional accuracy can be ignored. Further, the dimensions of the outer ring can be easily adjusted by processing the thin metal plate.
Further, the thin metal plate protects the insulating thin film from being damaged when it is attached to the housing, and also prevents the insulating thin film from being broken by a load during use. Since the insulating thin film is made of polyamide and PPS, it has excellent dimensional stability and impact resistance.
Also, by setting the thickness of this thin film to be 0.1 mm or more, desired electrical insulation can be obtained.
When the thickness is less than or equal to mm, the strain amount due to the load during use can be suppressed.
【0008】[0008]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図1には、主電動機ハウジング2に取付けられる
電気絶縁軸受1が示されている。この電気絶縁軸受1
は、ハウジング2に固定される外輪3と、電機子軸4が
嵌められる内輪5との間に複数の転動体6を介装したも
のである。外輪3は、図2に拡大して示すように、外輪
本体11と、この外輪本体11の外周部を覆う絶縁性薄
膜12と、この絶縁性薄膜12の外面に設けられた薄肉
金属板13とを一体に成形したものである。すなわち、
外輪本体11は、金属製であって導電性を有するもので
あり、その内周部に転動体6の軌道11aを有する。絶
縁性薄膜12は、外輪本体11とハウジング2とを電気
的に絶縁するためのものであって、ナイロンMXD6と
PPSとのアロイ化樹脂100重量部とガラス繊維50
重量部からなる高分子弾性材料である。この絶縁性薄膜
は、外輪本体11の外周面11bから側面11cに亘る
部分を覆っている。また、薄肉金属板13は、外輪本体
11に直接触れないように、絶縁性薄膜12の外面に固
着されている。外輪3の外径が170mm程度である場
合、絶縁性薄膜12の厚さは0.1〜2.0mm、電気抵
抗は100MΩ以上、薄肉金属板の厚さは1.0mm程度
が好ましい。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electrically insulated bearing 1 mounted on a main motor housing 2. This electrically insulated bearing 1
Is a plurality of rolling elements 6 interposed between an outer ring 3 fixed to the housing 2 and an inner ring 5 to which the armature shaft 4 is fitted. As shown in an enlarged scale in FIG. 2, the outer ring 3 includes an outer ring body 11, an insulating thin film 12 that covers an outer peripheral portion of the outer ring body 11, and a thin metal plate 13 provided on the outer surface of the insulating thin film 12. Is integrally molded. That is,
The outer race body 11 is made of metal and has conductivity, and has the raceway 11a of the rolling element 6 on its inner peripheral portion. The insulating thin film 12 is for electrically insulating the outer race body 11 and the housing 2 from each other, and is 100 parts by weight of an alloy resin of nylon MXD6 and PPS and a glass fiber 50.
It is a polymeric elastic material consisting of parts by weight. The insulating thin film covers a portion of the outer race body 11 extending from the outer peripheral surface 11b to the side surface 11c. The thin metal plate 13 is fixed to the outer surface of the insulating thin film 12 so as not to directly touch the outer ring body 11. When the outer diameter of the outer ring 3 is about 170 mm, the thickness of the insulating thin film 12 is preferably 0.1 to 2.0 mm, the electric resistance is 100 MΩ or more, and the thickness of the thin metal plate is preferably about 1.0 mm.
【0009】一方、内輪5はその外周部に転動体6の軌
道5aを有し、転動体6は保持器7に保持されている。
これら内輪5と転動体6と保持器7はいずれも金属製で
あり、導電性を有する。On the other hand, the inner ring 5 has a raceway 5a of the rolling element 6 on its outer peripheral portion, and the rolling element 6 is held by a cage 7.
The inner ring 5, the rolling element 6, and the cage 7 are all made of metal and have conductivity.
【0010】次に、外輪3の製法を説明する。この場
合、図3に示す金型を用いる。同図において、15は外
輪本体11が外嵌される下型、16は外輪本体11の上
に被せる上型、17は薄肉金属板用部材13Aを外輪本
体11に位置決めすると共に下型15と相まって絶縁性
薄膜12を成形するためのキャビティ19を形成する外
型、18は外型17を固定する外枠である。外型17は
周方向に2つ割りになっている。係る構成の金型を用い
て外輪3は以下の順序で製作される。Next, a method of manufacturing the outer ring 3 will be described. In this case, the mold shown in FIG. 3 is used. In the figure, reference numeral 15 is a lower die to which the outer ring body 11 is fitted, 16 is an upper die that covers the outer ring body 11, and 17 is a member for positioning the thin metal plate member 13A on the outer ring body 11 and coupled with the lower die 15. An outer die for forming a cavity 19 for molding the insulating thin film 12 and an outer frame 18 for fixing the outer die 17. The outer mold 17 is divided into two in the circumferential direction. The outer ring 3 is manufactured in the following order using the mold having such a configuration.
【0011】 外輪本体11の絶縁性薄膜12が固着
される外周面11bおよび側面11Cにサンドブラスト
処理を施して接着剤を塗布し、室温で乾燥後、323K
×120分の予熱処理を行う。接着剤としては、例え
ば、ロード・ファー・イースト社製ケムロック#218
を用いることができる。 下型15、上型16、外型17および外枠18を3
68Kに予熱しておいて、これに上記外輪本体11およ
び薄肉金属板用部材13Aを図3に示す如く組込む。 上記金型のキャビティ19に上記組成の高分子弾性
材料20を射出成形にて注入する。 所定時間冷却後脱型し、製品を取り出す。 以上のようにして(必要に応じて薄肉金属板用部材
13Aの外面に研磨加工による仕上げ処理を施して)得
られた外輪3と内輪5との間に転動体6を組付けて電気
絶縁軸受1を得る。The outer peripheral surface 11b and the side surface 11C to which the insulating thin film 12 of the outer ring body 11 is fixed are sandblasted to apply an adhesive, dried at room temperature, and then dried at 323K.
Pre-heat treatment for 120 minutes is performed. As an adhesive, for example, ChemFlock # 218 manufactured by Road Far East Co., Ltd.
Can be used. 3 lower mold 15, upper mold 16, outer mold 17 and outer frame 18
It is preheated to 68K and the outer ring body 11 and the thin metal plate member 13A are assembled therein as shown in FIG. The polymeric elastic material 20 having the above composition is injected into the cavity 19 of the mold by injection molding. After cooling for a predetermined time, the mold is removed and the product is taken out. The electrically insulated bearing is constructed by assembling the rolling element 6 between the outer ring 3 and the inner ring 5 obtained as described above (finishing the outer surface of the thin-walled metal plate member 13A by polishing). Get one.
【0012】従って、上記軸受1においては、外輪3の
絶縁性薄膜12はポリアミド−PPSアロイ化材料で形
成され、外輪3がこの絶縁性薄膜12によってハウジン
グ2と電気的に絶縁するための絶縁性を有する。よっ
て、この外輪3を作製した段階で、外輪本体11と薄肉
金属板13との間の電気抵抗を測定することによって、
その絶縁性を評価することができる。この場合、上記絶
縁性薄膜12と薄肉金属板13の重合わせ部の各々の厚
さは、0.5mm、1.0mmであり、電気抵抗は100M
Ω以上であった。Therefore, in the bearing 1, the insulating thin film 12 of the outer ring 3 is formed of a polyamide-PPS alloy material, and the insulating ring 12 electrically insulates the outer ring 3 from the housing 2. Have. Therefore, by measuring the electric resistance between the outer ring body 11 and the thin metal plate 13 at the stage of manufacturing the outer ring 3,
Its insulating property can be evaluated. In this case, the thickness of each of the overlapping portions of the insulating thin film 12 and the thin metal plate 13 is 0.5 mm and 1.0 mm, and the electric resistance is 100 M.
It was more than Ω.
【0013】そして、上記軸受1はハウジング2および
電機子軸4に組みつけられる。この組付状態において、
軸受1は上記の如く絶縁性薄膜12に100MΩ以上の
電気抵抗があるため、ハウジング2から電機子軸4への
放電はなく、軸受1の異常摩耗は生じない。この場合、
薄肉金属板13は絶縁性薄膜12の外側に設けられ、外
輪本体11と直接接触しないから、電気絶縁性に悪影響
を及ぼすことはなく、しかも、絶縁性薄膜12が外輪本
体11の外周面11bだけでなく側面11cをも覆って
いるから、電気絶縁性を確実に得ることができる。The bearing 1 is assembled to the housing 2 and the armature shaft 4. In this assembled state,
Since the insulating thin film 12 of the bearing 1 has an electric resistance of 100 MΩ or more as described above, there is no discharge from the housing 2 to the armature shaft 4 and no abnormal wear of the bearing 1 occurs. in this case,
Since the thin metal plate 13 is provided outside the insulating thin film 12 and does not come into direct contact with the outer ring body 11, it does not adversely affect the electrical insulation, and the insulating thin film 12 is only the outer peripheral surface 11b of the outer ring body 11. Not only that, but also the side surface 11c is covered, so that electrical insulation can be surely obtained.
【0014】また、上記軸受1の組付けにおいて、上記
の如く外輪3が絶縁性を有するため、軸受1とハウジン
グ2との間に電気絶縁のための余分な介装物を設ける必
要がない。従って、軸受1の組付けが容易である。ま
た、軸受部の寸法精度(軸受1をハウジング2に組付け
た状態でのハウジング2と電機子軸4との間の位置精
度)は、基本的には軸受1の外径、つまり外輪3の外径
で決まることになり、外輪3を製作した段階でその寸法
を調整することにより、軸受部の寸法精度を高くするこ
とができる。つまり、余分な介装物がある場合、それだ
け寸法精度が低下するが、上記軸受1の場合には介装物
が不要であるから、寸法精度を高くすることができる。
さらに、絶縁性薄膜12はそれ自体の厚さが薄いため、
使用時の負荷による歪み量が小さく、寸法精度への影響
を無視することができる。また、薄肉金属板13は、軸
受1を組み立てる際や、軸受1をハウジング2に組みつ
ける際に、絶縁性薄膜12に外傷を与えないようにこれ
を保護すると共に、軸受1をハウジング2に組みつけた
状態での使用時に絶縁性薄膜12が大きな負荷によって
破壊することを防止するものであり、絶縁性薄膜12よ
り厚くするのが好ましい。Further, when the bearing 1 is assembled, since the outer ring 3 has an insulating property as described above, it is not necessary to provide an extra interposition between the bearing 1 and the housing 2 for electrical insulation. Therefore, the assembly of the bearing 1 is easy. Further, the dimensional accuracy of the bearing portion (positional accuracy between the housing 2 and the armature shaft 4 when the bearing 1 is assembled to the housing 2) is basically the outer diameter of the bearing 1, that is, the outer ring 3 Since the outer diameter is determined, the dimensional accuracy of the bearing portion can be increased by adjusting the dimensions of the outer ring 3 when it is manufactured. That is, if there is an extra interposer, the dimensional accuracy is reduced, but in the case of the bearing 1, the interposer is not required, so that the dimensional accuracy can be increased.
Furthermore, since the insulating thin film 12 has a small thickness,
The amount of strain due to the load during use is small, and the effect on dimensional accuracy can be ignored. Further, the thin metal plate 13 protects the insulating thin film 12 from being damaged when the bearing 1 is assembled or the bearing 1 is assembled to the housing 2, and the bearing 1 is assembled to the housing 2. It is intended to prevent the insulating thin film 12 from being destroyed by a large load during use in a found state, and it is preferable that the insulating thin film 12 is thicker than the insulating thin film 12.
【0015】次に、以下の表1に示す本発明に係るポリ
アミド−PPSアロイ化樹脂と比較例に係る樹脂を被覆
した軸受について、吸水による寸法変化と吸油による寸
法変化を測定した。その結果を図7と図8に示す。な
お、寸法変化の測定は、図6に示す形状のもの(図にお
いて、31は樹脂、32はベアリングである)を射出成
形により作製し、水中または白灯油中に400時間浸漬
し、30mm外径部の寸法変化を測定することにより行っ
た。また、表1の本実施例の樹脂と比較例の樹脂につい
て、曲げ弾性率の温度依存性をASTM−D790に準
じて293〜413Kの温度範囲で測定した。その結果
を図9に示す。また、表1の樹脂の基本物性を表2に示
す。Next, the dimensional change due to water absorption and the dimensional change due to oil absorption were measured for bearings coated with the polyamide-PPS alloyed resin according to the present invention and the resin according to the comparative example shown in Table 1 below. The results are shown in FIGS. 7 and 8. In addition, the measurement of the dimensional change was made by injection molding the one having the shape shown in FIG. 6 (in the figure, 31 is a resin, 32 is a bearing) and immersed in water or white kerosene for 400 hours to obtain an outer diameter of 30 mm. This was done by measuring the dimensional change of the part. Further, the temperature dependence of the flexural modulus of the resin of the present example and the resin of the comparative example in Table 1 was measured in the temperature range of 293 to 413K according to ASTM-D790. The result is shown in FIG. Table 2 shows basic physical properties of the resins shown in Table 1.
【0016】[0016]
【表1】 [Table 1]
【0017】[0017]
【表2】 [Table 2]
【0018】図7〜9および表2より以下の点が明らか
である。 〔吸水性、吸油性〕図7、8より、比較例1であるナイ
ロン66樹脂は、吸湿しやすく、また吸油しやすいこと
が分かる。これに比して、実施例1、実施例2のナイロ
ンMXD6−PPSアロイ化樹脂ならびに比較例2のP
PS樹脂は、吸湿性ならびに吸油性が低く、寸法精度が
安定していることが分かる。 〔曲げ弾性率の温度依存性〕図9より、比較例1、比較
例2に比較して実施例1、実施例2に係るものは高温雰
囲気下でも曲げ弾性率の値が大きく、高温下でも荷重に
よる歪みは小さいことが分かる。 〔温度による寸法変化〕表2より、実施例1、実施例2
に係るものは、比較例1、比較例2に比して線膨張係数
が小さく、温度による寸法変化が少ない特性を有するこ
とが分かる。The following points are apparent from FIGS. 7 to 9 and Table 2. [Water Absorption and Oil Absorption] It can be seen from FIGS. 7 and 8 that the nylon 66 resin of Comparative Example 1 easily absorbs moisture and easily absorbs oil. In comparison, nylon MXD6-PPS alloyed resins of Examples 1 and 2 and P of Comparative Example 2 were compared.
It can be seen that the PS resin has low hygroscopicity and oil absorption and has stable dimensional accuracy. [Temperature Dependence of Bending Elastic Modulus] As shown in FIG. 9, compared with Comparative Examples 1 and 2, those according to Examples 1 and 2 have large bending elastic modulus values even in a high temperature atmosphere, and It can be seen that the strain due to the load is small. [Dimensional Change with Temperature] From Table 2, Example 1 and Example 2
It can be seen that the material according to (1) has a smaller coefficient of linear expansion than Comparative Examples 1 and 2, and has a characteristic of less dimensional change due to temperature.
【0019】〔耐衝撃性〕表2より、実施例1、実施例
2に係るものは、比較例1、比較例2に比して衝撃強度
が高く、耐衝撃性に優れていることが分かる。[Impact resistance] From Table 2, it can be seen that those according to Examples 1 and 2 have higher impact strength and superior impact resistance than Comparative Examples 1 and 2. .
【0020】図4および図5は外輪の他の実施例を示す
ものである。図4に示す外輪21は、絶縁性薄膜23の
幅を薄肉金属板24と同幅にして、外輪本体22の側面
全体を外部に露出せしめたものである。一方、図5に示
す外輪25は、絶縁性薄膜27で外輪本体26の側面を
も覆うようにし、且つ絶縁性薄膜27が外輪本体26の
外周面を覆う部分の厚さと側面を覆う部分の厚さとが同
一になるようにしたものである。なお、上記図5の実施
例では、絶縁性薄膜と薄肉金属板とを外輪本体のハウジ
ングに取りつけられる部位にのみ設けたが、先に説明し
た他の実施例においても、絶縁性薄膜と薄肉金属板とを
上記図5の実施例と同様に外輪本体のハウジングに取り
つけられる部位にのみ設けてもよい。また、上記実施例
は、鉄道車両の主電動機の回転軸受に関するが、本発明
は他の機械器具の軸受、さらに車両の車台軸受にまで適
用することが可能である。4 and 5 show another embodiment of the outer ring. In the outer ring 21 shown in FIG. 4, the insulating thin film 23 has the same width as the thin metal plate 24, and the entire side surface of the outer ring main body 22 is exposed to the outside. On the other hand, in the outer ring 25 shown in FIG. 5, the insulating thin film 27 also covers the side surface of the outer ring main body 26, and the insulating thin film 27 covers the outer peripheral surface of the outer ring main body 26 and the thickness of the portion covering the side surface. It is designed so that and are the same. In the embodiment of FIG. 5 described above, the insulating thin film and the thin metal plate are provided only in a portion that can be attached to the housing of the outer ring body, but in the other embodiments described above, the insulating thin film and the thin metal plate are also provided. The plate may be provided only at a portion to be attached to the housing of the outer ring main body as in the embodiment shown in FIG. Further, although the above embodiments relate to the rotary bearing of the main electric motor of the railway vehicle, the present invention can be applied to the bearings of other machinery and equipment as well as the undercarriage bearing of the vehicle.
【0021】[0021]
【発明の効果】本発明に係る電気絶縁軸受は上記のよう
に構成されているので、以下の効果を奏する。 軸受とハウジングとの間に電気絶縁用の部材を設け
る必要がないから、軸受の組みつけが容易であり、寸法
精度が高く、しかも吸水性・吸油性が低く、温度による
寸法変化も少ないから、極めて寸法精度が安定してい
る。 耐衝撃性に優れているので、機械的ショックに強
い。 軸受単体で電気絶縁性を評価することができる。 薄肉金属板が絶縁性皮膜を保護するので、絶縁寿命
が長い。Since the electrically insulated bearing according to the present invention is constructed as described above, it has the following effects. Since it is not necessary to provide a member for electrical insulation between the bearing and the housing, the bearing can be easily assembled, the dimensional accuracy is high, the water absorption and oil absorption are low, and the dimensional change due to temperature is small. Extremely stable dimensional accuracy. It has excellent shock resistance and is resistant to mechanical shock. The electric insulation can be evaluated by the bearing alone. Since the thin metal plate protects the insulating film, the insulation life is long.
【図1】本発明の電気絶縁軸受の断面図である。FIG. 1 is a sectional view of an electrically insulated bearing of the present invention.
【図2】図1の外輪部分の拡大図である。FIG. 2 is an enlarged view of an outer ring portion of FIG.
【図3】外輪の製造装置を示す断面図である。FIG. 3 is a cross-sectional view showing an outer ring manufacturing apparatus.
【図4】外輪の他の実施例を示す断面図である。FIG. 4 is a cross-sectional view showing another embodiment of the outer ring.
【図5】外輪のさらに他の実施例を示す断面図である。FIG. 5 is a cross-sectional view showing still another embodiment of the outer ring.
【図6】吸水性および吸油性を評価するための樹脂を外
装したベアリングの断面図である。FIG. 6 is a cross-sectional view of a bearing coated with a resin for evaluating water absorption and oil absorption.
【図7】吸水による軸受の寸法変化を示す図である。FIG. 7 is a diagram showing a dimensional change of a bearing due to water absorption.
【図8】吸油による軸受の寸法変化を示す図である。FIG. 8 is a diagram showing a dimensional change of a bearing due to oil absorption.
【図9】本実施例に係る樹脂と比較例に係る樹脂の曲げ
弾性率の温度依存性を示す図である。FIG. 9 is a diagram showing temperature dependence of flexural modulus of a resin according to this example and a resin according to a comparative example.
1…電気絶縁軸受 2…ハウジング 3、21、25…外輪 4…電機子軸 5…内輪 5a…軌道 6…転動体 11、22、26…外輪本体 11a…軌道 11b…外周面 11c…側面 12、23、27…絶縁性薄膜 13、24、28…薄肉金属板 DESCRIPTION OF SYMBOLS 1 ... Electrically insulating bearing 2 ... Housing 3, 21, 25 ... Outer ring 4 ... Armature shaft 5 ... Inner ring 5a ... Raceway 6 ... Rolling element 11, 22, 26 ... Outer ring body 11a ... Raceway 11b ... Outer peripheral surface 11c ... Side surface 12, 23, 27 ... Insulating thin film 13, 24, 28 ... Thin metal plate
フロントページの続き (72)発明者 福永 久雄 兵庫県神戸市兵庫区明和通3丁目2番15号 バンドー化学株式会社内 (72)発明者 布施 芳哉 兵庫県神戸市兵庫区明和通3丁目2番15号 バンドー化学株式会社内 (72)発明者 渡邉 朝紀 東京都国分寺市光町2丁目8番地38 財団 法人鉄道総合技術研究所内Front page continued (72) Inventor Hisao Fukunaga 3-2-15 Meiwadori, Hyogo-ku, Kobe, Hyogo Prefecture Bando Kagaku Co., Ltd. (72) Inventor Yoshiya Fuse 3-2-115, Meiwadori, Kobe, Hyogo Prefecture No. Bandou Kagaku Co., Ltd. (72) Inventor Asaki Watanabe 2-8 Mitsumachi, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute
Claims (1)
電気絶縁軸受であって、上記外輪は、転動体が転動する
軌道を有する金属製の外輪本体と、この外輪本体のハウ
ジングに取り付けられる部位を被覆するポリアミドとポ
リフェニレンサルファイドとのアロイ化材料よりなる
0.1〜2.0mm厚みの絶縁性薄膜と、この絶縁性薄膜
の外面に設けられた薄肉金属板とが一体に成形されてな
ることを特徴とする電気絶縁軸受。1. An electrically insulated bearing having a rolling element interposed between an outer ring and an inner ring, wherein the outer ring comprises a metal outer ring main body having a track on which the rolling element rolls, and an outer ring main body of the outer ring main body. An insulating thin film having a thickness of 0.1 to 2.0 mm and made of an alloyed material of polyamide and polyphenylene sulfide, which covers a portion to be attached to a housing, and a thin metal plate provided on the outer surface of the insulating thin film are integrally formed. An electrically insulated bearing characterized by being molded.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4254404A JPH06147231A (en) | 1992-09-24 | 1992-09-24 | Electric insulating bearing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4254404A JPH06147231A (en) | 1992-09-24 | 1992-09-24 | Electric insulating bearing |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06147231A true JPH06147231A (en) | 1994-05-27 |
Family
ID=17264508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4254404A Pending JPH06147231A (en) | 1992-09-24 | 1992-09-24 | Electric insulating bearing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06147231A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005017251A (en) * | 2003-06-30 | 2005-01-20 | Ntn Corp | Fixture and method for measuring insulation resistance of insulated bearing |
DE102013223677A1 (en) * | 2013-11-20 | 2015-05-21 | Schaeffler Technologies AG & Co. KG | Wälzkörperkranz with sandwich sheet |
DE102019104702A1 (en) * | 2019-02-25 | 2020-08-27 | Schaeffler Technologies AG & Co. KG | camp |
US10823229B2 (en) | 2017-03-24 | 2020-11-03 | Aktiebolaget Skf | Rolling-element bearing including an electrically insulating layer |
WO2022092070A1 (en) * | 2020-10-29 | 2022-05-05 | Ntn株式会社 | Insulated bearing device |
WO2023002891A1 (en) * | 2021-07-20 | 2023-01-26 | Ntn株式会社 | Insulated rolling bearing |
-
1992
- 1992-09-24 JP JP4254404A patent/JPH06147231A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005017251A (en) * | 2003-06-30 | 2005-01-20 | Ntn Corp | Fixture and method for measuring insulation resistance of insulated bearing |
DE102013223677A1 (en) * | 2013-11-20 | 2015-05-21 | Schaeffler Technologies AG & Co. KG | Wälzkörperkranz with sandwich sheet |
US10823229B2 (en) | 2017-03-24 | 2020-11-03 | Aktiebolaget Skf | Rolling-element bearing including an electrically insulating layer |
DE102019104702A1 (en) * | 2019-02-25 | 2020-08-27 | Schaeffler Technologies AG & Co. KG | camp |
WO2022092070A1 (en) * | 2020-10-29 | 2022-05-05 | Ntn株式会社 | Insulated bearing device |
WO2023002891A1 (en) * | 2021-07-20 | 2023-01-26 | Ntn株式会社 | Insulated rolling bearing |
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