JP2005017102A

JP2005017102A - Insulation performance testing machine of insulated bearing

Info

Publication number: JP2005017102A
Application number: JP2003182033A
Authority: JP
Inventors: Hiromitsu Kondo; 博光近藤; Hironobu Ito; 廣信伊藤
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2003-06-26
Filing date: 2003-06-26
Publication date: 2005-01-20
Anticipated expiration: 2023-06-26
Also published as: JP4369690B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a testing machine used for a test of an insulated bearing in a main motor of a rolling stock or the like, capable of evaluating the insulation performance of the individual insulated bearing in the state similar to the actual machine using state. <P>SOLUTION: This testing machine comprises a common shaft 3 for interfitting inner rings of a plurality of insulated bearings 46, 47, a plurality of respective housings 11, 12 for interfitting respectively outer rings of each insulated bearing 46, 47, and a common base 4 for installing thereon the respective housings 11, 12. Insulators 8, 9 are interposed between each of the respective housings 11, 12 and the base 4. In the testing machine, insulation resistance measuring means 1, 2 are provided respectively to each insulated bearing 46, 47, and the insulation resistance between a part on the furthermore inner diameter side than the insulation part on the insulated bearings 46, 47 and the respective housings 11, 12 corresponding to the insulated bearings 46, 47 is measured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、鉄道車両の主電動機などに用いられる絶縁軸受の絶縁性能試験機に関する。
【０００２】
【従来の技術】
鉄道車両においては、台車の主電動機、駆動装置、車軸などの各部位に軸受が用いられている。近年、鉄道技術の進歩に伴い、上記主電動機にもＶＶＶＦ（可変電圧・可変周波数制御法）が適用されるようになり、それに伴って主電動機に用いられる軸受に電食の発生が多くなっている。軸受に電食が発生すると、軸受転走面が損傷を受けて、異音が発生し、さらには剥離が発生することがあり、それを防ぐために軸受の絶縁性が必要となっている。このような要請に応えるために、転動体に絶縁体であるセラミックスを用いたり、外輪の外径面にセラミックスやＰＰＳ樹脂などからなる絶縁皮膜を形成した絶縁軸受が開発されている。
【０００３】
図９は鉄道車両の一般的な台車の構造概略図を示す。台車４１に設置された主電動機４２の駆動は、そのモータ軸４３から駆動装置４４を介して車軸４５に伝達される。車軸４５は、両端で車軸軸受４６に支持される。このように台車４１においては主電動機４２内の軸受、駆動装置４４の軸受、および車軸軸受４６があるが主電動機４２内の軸受に絶縁軸受が用いられる。
図１０は主電動機４２の断面図を示す。モータ軸４３の一端部は第１の絶縁軸受４６を介してモータハウジング４８の一端部に支持され、モータ軸４３の他端部は第２の絶縁軸受４７を介してモータハウジング４８の他端部に支持される。モータ軸４３の中間部にはロータ４９が設けられ、このロータ４９の外径側にステータコイル等を含むステータ５０が、モータハウジング４８に設置されている。第１の絶縁軸受４６は玉軸受からなり、第２の絶縁軸受４７はモータ軸４３等の熱伸縮を許容するために円筒ころ軸受が用いられている。これらの絶縁軸受４６，４７は、その外輪がモータハウジング４８の両端の分割ハウジング部５１，５２に設置されている。モータハウジング４８における上記各絶縁軸受４６，４７の両側の幅面と対向する部分には、それぞれグリースポケット５７を有する蓋部材５３〜５６が取付けられている。グリースポケット５７は、絶縁軸受４６，４７の潤滑寿命ないしグリース補給間隔を長くなるために設けられるものである。
【０００４】
このような絶縁軸受（例えば外輪の外径面に絶縁皮膜を形成したもの）の絶縁性能を評価する場合、従来は、図１１のように、絶縁軸受６１を単体で２つ割りハウジング６３に組み込んで、絶縁抵抗測定器６４の両電極６４ａ，６４ｂをハウジング６３と軸受外輪６２の母材とに接触させ、ハウジング６３と外輪母材の間の絶縁抵抗を測定していた。
【０００５】
【発明が解決しようとする課題】
しかし、モータ軸４３等に対として用いられる両側の絶縁軸受４６，４７は、負荷される荷重が互いに異なる。そのため、上記のような軸受単体の測定では、運転時間に対応した実機相当の絶縁性能の変化を調べることができなかった。
また、鉄道車両の主電動機に用いられる絶縁軸受等では、主電動機に組み込まれた状態でグリースが封入され、図１０のように絶縁軸受４６，４７にはグリースポケット５７を有する蓋部材５３〜５６等の周辺部材が取付けられる。そのため、上記したように軸受単体で絶縁抵抗を測定する場合と異なる状況になる。また、主電動機の回転駆動によりグリースが移動・排出されることにもなる。グリースは完全な絶縁体ではなく、グリース移動による洩れから絶縁性が低下することもある。そのため、軸受単体で測定する場合とは、絶縁性能の試験結果が異なって来る。しかし、従来は、このような実機相当状態での絶縁性能については、確認されていなかった。
なお、図１０に示す主電動機４２等の実機において、モータハウジング４８とモータ軸４３との間の絶縁性能を測定することはできる。しかし、その場合、両端の絶縁軸受４６，４７を組み合わせた状態での絶縁性能が測定されることになり、個々の絶縁軸受４６，４７についての測定は行えない。そのため、実機または実機相当状態での個々の絶縁軸受４６，４７の絶縁性能は、いずれの方法でも評価することができなかった。
鉄道車両主電動機等における性能向上の要求から、このような実機相当状態での個々の絶縁軸受４６，４７の絶縁性能の評価が求められてきている。
【０００６】
この発明の目的は、実機使用状態に近似した状態での個々の絶縁軸受の絶縁性能を評価できる絶縁軸受の絶縁性能試験機を提供することである。
【０００７】
【課題を解決するための手段】
この発明の絶縁軸受の絶縁性能試験機は、複数の絶縁軸受の内輪を嵌合させる共通の軸と、各絶縁軸受の外輪をそれぞれ嵌合させる複数の個別ハウジングと、これら個別ハウジングを設置する共通の基台と、上記各個別ハウジングと基台との間に介在させた絶縁体と、上記各絶縁軸受に対してそれぞれ設けられてその絶縁軸受における絶縁部分よりも内径側の部分とその絶縁軸受に対応する個別ハウジングとの間の絶縁抵抗を測定する複数の絶縁抵抗測定手段とを備えたものである。
この構成によると、一対の絶縁軸受を共通の軸に嵌合させて絶縁抵抗を測定するようにしたため、実機における軸の両端に使用された状態での絶縁軸受の絶縁性能を評価することができる。例えば、軸を回転させて、運転時間に対応した実機相当の絶縁性能の変化を調べることができる。また、各絶縁軸受に対して個別ハウジングを設け、個別ハウジングと共通の基台との間に絶縁体を介在させたため、個々の絶縁軸受の絶縁抵抗を測定することができる。このように、例えば鉄道車両の主電動機等の軸受装備実機に組み込まれた軸受使用状態での絶縁性能の評価を、実機試験の前に行うことができる。
【０００８】
この発明において、上記絶縁軸受が外輪の母材の外径面および幅面に上記絶縁部分である絶縁被覆を有するものであり、上記絶縁抵抗測定手段に導通させる上記絶縁軸受の絶縁部分よりも内径側の部分が、上記絶縁軸受の外輪の母材部分であっても良い。
この構成の場合は、絶縁軸受の外輪にその絶縁被覆を介して嵌合した個別ハウジングと軸受外輪の母材との間で絶縁抵抗測定手段による測定を行うので、内外輪間の転動体やグリース等の影響を受けずに、絶縁被覆の絶縁性能を評価することができる。
【０００９】
この発明において、上記絶縁軸受が外輪の母材の外径面および幅面に上記絶縁部分である絶縁被覆を有するものであり、上記絶縁抵抗測定手段に導通させる上記絶縁軸受の絶縁部分よりも内径側の部分が、上記絶縁軸受の内輪または上記軸であっても良い。
この構成の場合は、内外輪間に介在した転動体やグリースの影響を含めた絶縁性能の評価が行える。
【００１０】
この発明において、上記絶縁軸受がセラミックス製の転動体を有し、この転動体が上記絶縁部分となるものであり、上記絶縁抵抗測定手段に導通させる上記絶縁軸受の絶縁部分よりも内径側の部分が、上記絶縁軸受の内輪または上記軸であっても良い。
この構成の場合は、絶縁軸受がセラミックス製の転動体を有することで絶縁性能が付与されたものであっても、絶縁性能を評価することができる。
【００１１】
これらの発明において、上記複数の絶縁軸受を備える軸受装備実機の軸受周辺部を模して上記絶縁軸受の幅面を覆う蓋部材を上記個別ハウジングに取付けても良い。
この構成の場合は、実機における絶縁軸受の幅面を覆う蓋部材の影響を含めた絶縁性能の評価が行え、実機での使用により近い評価をすることができる。
【００１２】
上記のように蓋部材を設ける場合に、その蓋部材の軸受対向面にグリースポケットを設けても良い。
この構成の場合、実機の蓋部材の軸受対向面に設けられるグリースポケットにグリースを充填した状態での絶縁性能を評価することができる。上記のように、グリースは完全な絶縁体ではなく、グリース移動による洩れから絶縁性が低下することもある。そのため、軸受装備実機により近似した状態での絶縁性能の評価が行える。
【００１３】
これらの発明において、上記各個別ハウジングと基台との間に介在させた絶縁体が絶縁シートであっても良い。
絶縁体を介在させる場合、個別ハウジングと基台とをどのように結合するかが問題となるが、薄い部材である絶縁シートを用いることで、簡単にかつ堅固に個別ハウジングと基台とを結合することができる。また、絶縁体をどの位置でどのように介在させるかは、絶縁性能の評価において重要な要素であるが、絶縁シートを用いることで、絶縁部位が狭い空間になるように配置することが容易であり、絶縁部位の広がり等からのノイズによる外乱を少なくすることができる。
【００１４】
この発明において、上記共通の軸を回転させる回転駆動手段、および上記共通の軸が回転している状態で上記共通の軸にラジアル負荷を作用させる荷重負荷手段を設けても良い。
この場合、実機において軸に作用するラジアル荷重を模して軸受運転を行った状態での絶縁性能を評価することができ、さらに実機に近似した状態の絶縁性能評価が行える。
【００１５】
これらの発明において、上記複数の個別ハウジングと、上記共通の基台と、上記各個別ハウジングと基台との間に介在させた絶縁体とを設ける構成に代えて、各絶縁軸受の外輪をそれぞれ嵌合させる個別ハウジングと、両個別ハウジングの間に介在させた絶縁体とを設けても良い。
すなわち、この観点の絶縁軸受の絶縁性能試験機は、複数の絶縁軸受の内輪を嵌合させる共通の軸と、各絶縁軸受の外輪をそれぞれ嵌合させる複数の個別ハウジングと、両個別ハウジングの間に介在させた絶縁体と、上記各絶縁軸受に対してそれぞれ設けられてその絶縁軸受における絶縁部分よりも内径側の部分とその絶縁軸受に対応する個別ハウジングとの間の絶縁抵抗を測定する複数の絶縁抵抗測定手段とを備えたものである。
この構成した場合、共通のハウジングを省略して２つの個別ハウジングによるハウジング全体構造とでき、あるいは共通のハウジングを設けても、両側の個別ハウジングの間に設ける絶縁体を一つとできる。そのため試験機の構成が簡易となる。
【００１６】
【発明の実施の形態】
この発明の第１の実施形態を図１ないし図４と共に説明する。この実施形態の絶縁軸受の絶縁性能試験機は、図１０と共に前述した鉄道車両の主電動機４２に装備された両端の絶縁軸受４６，４７の絶縁性能を評価する試験機である。この絶縁性能試験機は、上記複数の絶縁軸受４６，４７の内輪５７，５８を嵌合させる共通の軸３と、各絶縁軸受４６，４７の外輪５９，６０をそれぞれ内部に嵌合させる複数の個別ハウジング１１，１２と、これら個別ハウジング１１，１２を設置する共通の基台４と、各絶縁軸受４６，４７に対応する複数の絶縁抵抗測定手段１，２とを備える。
【００１７】
基台４は、ベースフレーム５と、このベースフレーム５の上に立設された前後一対のコラム体６，６と、両コラム体６，６にまたがって横架されるスリーブ７とを有する。上記各個別ハウジング１１，１２は、両側のコラム体６，６の内部に設置される。より詳しくは、スリーブ７のコラム体６，６で支持された両端部分でその内径孔内に設置される。各個別ハウジング１１，１２と基台４との間には、図２および図４に拡大して示すように、絶縁シートからなる絶縁体８，９がそれぞれ介在させてある。絶縁体８，９の材質は、フッ素樹脂等の樹脂シート等が用いられる。上記スリーブ７は、図１０の主電動機４２のモータハウジング４８を模した部材である。また、各個別ハウジング１１，１２は、図１０の主電動機４２の両端の分割ハウジング部５１，５２を模した部材である。
【００１８】
個別ハウジング１１，１２における各絶縁軸受４６，４７の周辺部には、これら絶縁軸受４６，４７の両幅面を覆う蓋部材１３〜１６が取付けられている。これら蓋部材１３〜１６は軸受対向面にグリースポケット１３ａ〜１６ａを設けたものである。片方の絶縁軸受４６の両側の幅面に対応する蓋部材１３，１４は個別ハウジング１１に、もう片方の絶縁軸受４７の両側の幅面に対応する蓋部材１５，１６は個別ハウジング１２にそれぞれ取付けられる。絶縁軸受４６に対応する蓋部材１３，１４は、軸３に嵌合して絶縁軸受４６の内輪５７を軸方向に位置決めする一対の軸受押さえ部材１７，１８との間でラビリンスシール１９，２０をそれぞれ形成している。また、絶縁軸受４７に対応する蓋部材１５，１６は、軸３に嵌合して絶縁軸受４７の内輪５８を軸方向に位置決めする一対の軸受押さえ部材２１，２２との間でラビリンス２３，２４をそれぞれ形成している。上記各蓋部材１３〜１６は、図１０の主電動機４２の蓋部材５３〜５６を模した部材であり、各蓋部材１３〜１６とこれに対応する絶縁軸受４６，４７との間隔、およびグリースポケット１３ａ〜１６ａの形状，寸法は、主電動機４２の蓋部材５３〜５６と同様に形成されている。
【００１９】
上記各絶縁軸受４６，４７は、外輪５９，６０の外径面および幅面に絶縁部分５９ａ，６０ａである絶縁被覆を有するものである。絶縁軸受４６に対応する絶縁抵抗測定手段１は、絶縁軸受４６の絶縁部分（絶縁被覆）５９ａよりも内輪５７側の部分と個別ハウジング１１との間の絶縁抵抗を測定するものである。具体的には、上記絶縁抵抗測定手段１の一方の電極１ａが個別ハウジング１１に、他方の電極１ｂが絶縁軸受４６の外輪５９の母材部分５９ｂにそれぞれ電気的に接続される。上記一方の電極１ａは、例えば上記スリーブ７および絶縁体８に渡って孔７１（図２）を設けて個別ハウジング１１に接続しても良い。絶縁抵抗測定手段１の他方の電極１ｂは、蓋部材１４に軸方向に向けて貫通させた貫通孔１４ｂに絶縁部材からなるスリーブ２５を嵌合させ、このスリーブ２５内を経て上記外輪５９の内径面に臨ませることにより、外輪母材部分５９ｂに接触させている。電極１ｂはばね部材からなり、その弾性変形により、外輪母材部分５９ｂに押し当てられる。蓋部材１４のグリースポケット１４ａは、グリースポケット１４ａからグリースが流れ出ないように、図３に正面図で示すように周方向に複数個が分離して配置されており、隣合うグリースポケト１４ａ，１４ａの間の部分に上記スリーブ２５の貫通孔１４ｂが設けられる。
【００２０】
もう一方の絶縁軸受４７に対応する絶縁抵抗測定手段２は、絶縁軸受４７の絶縁部分（絶縁被覆）６０ａよりも内輪５８側の部分と個別ハウジング１２との間の絶縁抵抗を測定するものである。この場合も、絶縁抵抗測定手段２の一方の電極２ａが個別ハウジング１２に、他方の電極２ｂが絶縁軸受４７の外輪６０の母材部分６０ｂにそれぞれ電気的に接続される。絶縁抵抗測定手段２の他方の電極２ｂが、蓋部材１６に軸方向に向けて貫通させた貫通孔１６ｂに絶縁部材からなるスリーブ２６を嵌合させ、このスリーブ２６内を経て上記外輪６０の内径面に臨ませることにより外輪母材部分６０ｂに接触させていることは、先の絶縁抵抗測定手段１の場合と同じである。上記一方の電極２ａも、スリーブ７および絶縁体９に渡って孔７２（図４）を設けて個別ハウジング１２に接続しても良い。
なお、上記孔７１，７２は、必要であれば、さらに個別ハウジング１１，１２および絶縁軸受４７，４８の絶縁部分（絶縁被覆）５９ａ，６０ａに渡って貫通させ、上記他方の電極１ａ，２ａをこの孔７１，７２から外輪５９，６０の母材に接続しても良い。上記孔７１，７２は、電極１ａ，２ａまたは電極１ｂ，２ｂの挿通に用いない場合、形成しなくて良い。
【００２１】
また、この絶縁性能試験機では、その軸３に対してラジアル荷重を負荷させる負荷手段２７が設置されている。この荷重負荷手段２７による軸３への荷重の負荷は、軸受装備実機である図１０の主電動機４２におけるロータ４９の自重の影響を模して与えるものである。この荷重負荷手段２７は、上記軸３に軸受２８を介して回転自在に設けられた環体２９と、この環体２９に継手３０を介して進退ロッド３１が連結される油圧シリンダ等の駆動源３２とで構成される。駆動源３２は基台４のベース５に固定され、その進退ロッド３１を後退移動させることにより軸３へ荷重が負荷される。継手３０は、連結およびその解除が自在なものであり、この継手３０には、軸３に負荷される荷重を測定するロードセル等の荷重測定手段（図示せず）が組み込まれる。
【００２２】
軸３の一端部は、継手３３を介してモータからなる回転駆動源３４の回転駆動軸３５に連結される。継手３３は、連結および結合が自在なものである。
この継手３３、および上記ラジアル荷重の負荷手段２７における継手３０は、絶縁抵抗測定手段１，２により絶縁性能の測定時には結合が解除されるものである。この絶縁性能試験機を、軸３の回転中の軸受絶縁測定可能なものとする場合は、継手３０，３３において、軸３側と基台５側との絶縁を行うための絶縁体（図示せず）を介在させる。
【００２３】
次に、上記構成の絶縁性能試験機による絶縁軸受４６，４７の絶縁性能試験について説明する。この試験は、回転負荷用の回転駆動源３４の回転駆動軸３５を継手３３で軸３に連結し、荷重負荷手段２７でラジアル荷重を負荷した状態で回転駆動源３４により軸３を回転させた後に行われる。この回転駆動により、軸受４６，４７に封入したグリースの移動や、軸受４６，４７の発熱等が生じ、使用時に近似した状態となる。測定時には、継手３０，３３を分離して、荷重負荷手段２７の進退ロッド３１や、回転駆動源３４の回転駆動軸３５を、軸３から電気的に切り離す。この状態で、絶縁抵抗測定手段１により第１の絶縁軸受４６の絶縁性能を、また絶縁抵抗測定手段２により第２の絶縁軸受４７の絶縁性能をそれぞれ測定する。この場合に、絶縁抵抗測定手段１は、第１の絶縁軸受４６における外輪５９の母材部分５９ｂと、この絶縁軸受４６に対応する個別ハウジング１１との間の絶縁抵抗を測定する。また、絶縁抵抗測定手段２は、第２の絶縁軸受４７における外輪６０の母材部分６０ｂと、この絶縁軸受４７に対応する個別ハウジング１２との間の絶縁抵抗を測定する。
【００２４】
このように、この構成の絶縁性能試験機によると、鉄道車両の主電動機４２に組み込まれる絶縁軸受４６，４７に対して、使用状態をシュミレートして絶縁性能を評価することができ、かつ個々の絶縁軸受４６，４７の絶縁性能の評価が行える。特に、軸受装備実機である主電動機４２の軸受周辺部を模して、絶縁軸受４６，４７の幅面を覆う蓋部材１３〜１６を個別ハウジング１１，１２に取付けているので、実機に使用した状態に近い状態で絶縁性能を評価できる。また、蓋部材１３〜１６の軸受対向面にはグリースポケット１３ａ〜１６ａを設けているので、軸受装備実機により近似した装備状態で絶縁性能を評価できる。
個別ハウジング１１，１２と基台４との間の絶縁を行う場合、絶縁シートからなる絶縁体８，９をどの部分に挿入するかは絶縁性能評価の上で重要な要素であるが、こ実施形態のように、絶縁部位が狭い空間になるように配置することで、ノイズによる外乱を少なくすることができる。
なお、個別ハウジング１１，１２や、蓋部材１３〜１６は、絶縁軸受４６，４７のサイズに応じた種々のものを準備しておけば、各種サイズの絶縁軸受４６，４７の絶縁性能の測定を行うことができる。
【００２５】
なお、上記実施形態では、絶縁抵抗測定手段１，２の片方の電極１ｂ，２ｂを、外輪５９，６０の母材部分５９ｂ，６０ｂに電気的に接続させたが、これに代えて、図２および図４に１点鎖線で示すように、軸３あるいは軸受４６，４７の内輪５７，５８に電気的に接続しても良い。この場合、絶縁軸受４６では、個別ハウジング１１と軸３または内輪５７の間の絶縁抵抗を測定することになる。また絶縁軸受４７では、個別ハウジング１２と軸３または内輪５８の間の絶縁抵抗を測定することになる。
【００２６】
また、上記実施形態では、軸３の回転を止めて各絶縁軸受４６，４７の絶縁性能を測定するようにしたが、回転駆動源３４で軸３を回転させながら絶縁性能を測定しても良い。この場合には、継手３０，３３に絶縁体を介在させて、軸３を基台４から絶縁させる必要がある。このように、軸３を回転させながら絶縁性能を測定する場合、回転によるグリースの移動および軸受発熱の影響下で、絶縁性能が時間経過と共にどのように変化するかを評価することもできる。グリースは上記のように完全な絶縁体ではないため、回転中の絶縁測定が行えることで、グリースの影響をシュミレートしたより正確な絶縁性能評価が行える。
【００２７】
図５おび図６はこの発明の他の実施形態を示す。この実施形態は、図１〜図４に示した第１の実施形態の絶縁性能試験機において、試験対象である絶縁軸受４６，４７が、セラミックス製の転動体６５，６６を有するものであって、この転動体６５，６６が絶縁軸受４６，４７の絶縁部分となるものである。絶縁軸受４６に対応する絶縁抵抗測定手段１は、その一方の電極１ｂを、上記絶縁部分である転動体６５よりも内輪５７の部分、具体的には軸３または内輪５７に電気的に接続している。また、絶縁軸受４７に対応する絶縁抵抗測定手段２も、その一方の電極２ｂを、上記絶縁部分となる転動体６６よりも内輪５８の部分、具体的には軸３または内輪５８に電気的に接続している。その他の構成は第１の実施形態の場合と同じである。
【００２８】
この実施形態の絶縁性能試験機の場合も、鉄道車両の主電動機４２に組み込まれる絶縁軸受４６，４７に対して、使用状態での絶縁性能を評価することができる。
【００２９】
図７は、この発明のさらに他の実施形態の概略構成を示す。この実施形態は、第１の実施形態において、基台４のスリーブ７を省略したものである。第１の実施形態における蓋部材１３〜１６や、回転駆動源３４、荷重負荷手段２７は図示を省略しているが、蓋部材１３〜１６はこの実施形態においても第１の実施形態と同様に設けても、また省いても良い。第１の絶縁軸受４６の外輪５９は、個別ハウジング１１を介して基台４を構成する一方のコラム体６に支持され、コラム体６と個別ハウジング１１の間は絶縁体８で電気的に分離される。第２の絶縁軸受４７の外輪６０は、個別ハウジング１２を介して基台４を構成する他方のコラム体６に支持され、コラム体６と個別ハウジング１２の間は絶縁体９で電気的に分離される。絶縁軸受４６に対応する絶縁抵抗測定手段１は、個別ハウジング１１と、絶縁軸受４６の外輪母材部分５９ｂの間の絶縁抵抗を測定する。絶縁軸受４６に対応する絶縁提供測定手段２は、個別ハウジング１２と、絶縁軸受４７の外輪母材部分６０ｂの間の絶縁抵抗を測定する。その他の構成は第１の実施形態と同じである。
【００３０】
図８は、この発明のさらに他の実施形態を示す。この実施形態でも、第１の実施形態において、基台４のスリーブ７を省略している。この実施形態では、試験対象の各絶縁軸受４６，４７の外輪をそれぞれ嵌合させる個別ハウジング１１Ａ、１２Ａがコラム状に設けられ、これら個別ハウジング１１Ａ，１２Ｂの下端面と基台５の上面との間に絶縁シートからなる絶縁体８，９を介在させている。個別ハウジング１１Ａ，１２Ｂは、コラム状の個別ハウジング本体に、軸受嵌合部材１１Ａａ，１２Ａａを取付けたものとされている。第１の実施形態における蓋部材１３〜１６は、図示を省略しているが、この実施形態においても第１の実施形態と同様に設けても、また省いても良い。軸３を回転駆動する回転駆動源３４および荷重負荷手段２７は第１の実施形態と同様に設けており、さらに軸３の絶縁軸受４７設置側の端部にも、別の荷重負荷手段２７Ａを連結している。負荷手段２７，２７Ａは同一構造のものである。その他の構成は第１の実施形態の場合と同様である。絶縁軸受４６に対応する絶縁抵抗測定手段１は、個別ハウジング１１と、絶縁軸受４６の外輪母材部分５９ｂの間の絶縁抵抗を測定する。絶縁軸受４６に対応する絶縁提供測定手段２は、個別ハウジング１２と、絶縁軸受４７の外輪母材部分６０ｂの間の絶縁抵抗を測定する。
【００３１】
なお、上記実施形態では、各絶縁軸受４６，４７に対応する個別ハウジング１１，１２と基台５との間に絶縁体８，９を介在させた構成について示したが、これに代えて、各絶縁軸受の外輪をそれぞれ嵌合させる個別ハウジングと、両個別ハウジングの間に介在させた絶縁体とを設けたものとしても良い。例えば、図１に示す第１の実施形態において、いずれか片方の個別ハウジング１１，１２と基台４との間の絶縁体８，９を省略しても良い。その場合、その省略側の個別ハウジング１１，１２と基台４とでなるものが、この変形例で言う個別ハウジングとなる。
【００３２】
【発明の効果】
この発明の絶縁軸受の絶縁性能試験機は、複数の絶縁軸受の内輪を嵌合させる共通の軸と、各絶縁軸受の外輪をそれぞれ嵌合させる複数の個別ハウジングと、これら個別ハウジングを設置する共通の基台と、上記各個別ハウジングと基台との間に介在させた絶縁体と、上記各絶縁軸受に対してそれぞれ設けられてその絶縁軸受における絶縁部分よりも内径側の部分とその絶縁軸受に対応する個別ハウジングとの間の絶縁抵抗を測定する複数の絶縁抵抗測定手段とを備えたため、実機使用状態に近似した状態での個々の絶縁軸受の絶縁性能を評価することができる。特に、絶縁軸受の幅面を覆う蓋部材を設け、これにグリースポケットを設けた場合は、グリースの封入、蓋の取付状態等の実機により近似した状態での絶縁性能の評価が行える。
【図面の簡単な説明】
【図１】この発明の第１の実施形態にかかる絶縁軸受の絶縁性能試験機の一部破断正面図である。
【図２】同試験機の一部の拡大断面図である。
【図３】同試験機における蓋部材の側面図である。
【図４】同試験機の他の一部の拡大断面図である。
【図５】この発明の他の実施形態にかかる絶縁軸受の絶縁性能試験機の一部の拡大断面図である。
【図６】同試験機の他の一部の拡大断面図である。
【図７】この発明のさらに他の実施形態にかかる絶縁軸受の絶縁性能試験機の概略構成を示す断面図である。
【図８】この発明のさらに他の実施形態にかかる絶縁軸受の絶縁性能試験機を示す断面図である。
【図９】軸受装備実機である主電動機を装備した鉄道車両台車の概略正面図である。
【図１０】同主電動機の拡大断面図である。
【図１１】従来例の説明図である。
【符号の説明】
１，２…絶縁抵抗測定手段
３…軸
４…基台
８，９…絶縁体
１１，１２…個別ハウジング
１３〜１６…蓋部材
１３ａ〜１６ａ…グリースポケット
４６，４７…絶縁軸受
５７，５８…内輪
５９，６０…外輪
５９ａ，６０ａ…外輪の絶縁被覆（絶縁部分）
５９ｂ，６０ｂ…外輪の母材部分
６５，６６…転動体（絶縁部分）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulation performance tester for an insulation bearing used for a main motor of a railway vehicle.
[0002]
[Prior art]
In railway vehicles, bearings are used in various parts such as a main motor, a driving device, and an axle of a carriage. In recent years, with the advancement of railway technology, VVVF (variable voltage / variable frequency control method) has been applied to the main motor, and accordingly, the occurrence of electrolytic corrosion has increased in bearings used in the main motor. Yes. When electric corrosion occurs in the bearing, the rolling surface of the bearing is damaged, noise may be generated, and peeling may occur. In order to prevent this, the insulation of the bearing is necessary. In order to meet such a demand, an insulating bearing has been developed in which an insulating ceramic is used as a rolling element, or an insulating film made of ceramic or PPS resin is formed on the outer diameter surface of the outer ring.
[0003]
FIG. 9 shows a schematic diagram of the structure of a general carriage of a railway vehicle. The drive of the main motor 42 installed on the carriage 41 is transmitted from the motor shaft 43 to the axle 45 via the drive device 44. The axle 45 is supported by axle bearings 46 at both ends. As described above, the carriage 41 includes a bearing in the main motor 42, a bearing of the driving device 44, and an axle bearing 46, but an insulating bearing is used as the bearing in the main motor 42.
FIG. 10 is a sectional view of the main motor 42. One end of the motor shaft 43 is supported on one end of the motor housing 48 via the first insulating bearing 46, and the other end of the motor shaft 43 is supported on the other end of the motor housing 48 via the second insulating bearing 47. Supported by A rotor 49 is provided at an intermediate portion of the motor shaft 43, and a stator 50 including a stator coil and the like is installed on the motor housing 48 on the outer diameter side of the rotor 49. The first insulating bearing 46 is a ball bearing, and the second insulating bearing 47 is a cylindrical roller bearing for allowing thermal expansion and contraction of the motor shaft 43 and the like. These insulated bearings 46 and 47 have their outer rings installed in split housing portions 51 and 52 at both ends of the motor housing 48. Lid members 53 to 56 having grease pockets 57 are respectively attached to portions of the motor housing 48 facing the width surfaces on both sides of the insulating bearings 46 and 47. The grease pocket 57 is provided in order to increase the lubrication life of the insulating bearings 46 and 47 or the grease replenishment interval.
[0004]
When evaluating the insulating performance of such an insulating bearing (for example, an outer ring formed with an insulating film), conventionally, the insulating bearing 61 is split into two and assembled into the housing 63 as shown in FIG. Thus, both the electrodes 64a and 64b of the insulation resistance measuring instrument 64 are brought into contact with the housing 63 and the base material of the bearing outer ring 62, and the insulation resistance between the housing 63 and the outer ring base material is measured.
[0005]
[Problems to be solved by the invention]
However, the load applied to the insulated bearings 46 and 47 on both sides used as a pair for the motor shaft 43 and the like is different from each other. Therefore, in the measurement of the bearing alone as described above, it was not possible to examine the change in the insulation performance corresponding to the actual machine corresponding to the operation time.
Further, in an insulating bearing or the like used for a main motor of a railway vehicle, grease is enclosed in a state of being incorporated in the main motor, and the insulating bearings 46 and 47 have lid members 53 to 56 having grease pockets 57 as shown in FIG. A peripheral member such as is attached. Therefore, as described above, the situation is different from the case where the insulation resistance is measured with a single bearing. Further, the grease is moved and discharged by the rotational drive of the main motor. Grease is not a perfect insulator, and insulation may be degraded by leakage due to grease movement. Therefore, the insulation performance test results differ from the case of measuring with a bearing alone. However, conventionally, the insulation performance in the state equivalent to the actual machine has not been confirmed.
In the actual machine such as the main motor 42 shown in FIG. 10, the insulation performance between the motor housing 48 and the motor shaft 43 can be measured. However, in that case, the insulation performance in a state where the insulating bearings 46 and 47 at both ends are combined is measured, and the measurement of the individual insulating bearings 46 and 47 cannot be performed. Therefore, the insulation performance of the individual insulation bearings 46 and 47 in the actual machine or the state equivalent to the actual machine could not be evaluated by any method.
In response to demands for performance improvement in railway vehicle main motors and the like, it has been required to evaluate the insulation performance of the individual insulation bearings 46 and 47 in a state equivalent to such an actual machine.
[0006]
An object of the present invention is to provide an insulation performance testing machine for an insulated bearing capable of evaluating the insulation performance of each insulated bearing in a state approximate to the actual machine use state.
[0007]
[Means for Solving the Problems]
The insulation performance testing machine for insulated bearings according to the present invention includes a common shaft for fitting inner rings of a plurality of insulated bearings, a plurality of individual housings for fitting outer rings of the respective insulated bearings, and a common for installing these individual housings. A base, an insulator interposed between each of the individual housings and the base, and a portion on the inner diameter side of the insulating bearing provided with respect to each of the insulating bearings and the insulating bearing And a plurality of insulation resistance measuring means for measuring the insulation resistance between the individual housings.
According to this configuration, since the insulation resistance is measured by fitting a pair of insulated bearings to a common shaft, the insulation performance of the insulated bearing in a state where it is used at both ends of the shaft in an actual machine can be evaluated. . For example, by rotating the shaft, it is possible to examine the change in insulation performance corresponding to the actual machine corresponding to the operation time. Further, since an individual housing is provided for each insulated bearing and an insulator is interposed between the individual housing and the common base, the insulation resistance of each insulated bearing can be measured. As described above, for example, the evaluation of the insulation performance in a state of using a bearing incorporated in a bearing-equipped actual machine such as a main motor of a railway vehicle can be performed before the actual machine test.
[0008]
In this invention, the insulating bearing has an insulating coating as the insulating portion on the outer diameter surface and the width surface of the base material of the outer ring, and the inner diameter side of the insulating portion of the insulating bearing that conducts to the insulation resistance measuring means. This part may be a base material part of the outer ring of the insulated bearing.
In this configuration, measurement is performed by an insulation resistance measuring means between the individual housing fitted to the outer ring of the insulated bearing through the insulation coating and the base material of the outer ring of the bearing, so that rolling elements and grease between the inner and outer rings are measured. The insulation performance of the insulation coating can be evaluated without being affected by the above.
[0009]
In this invention, the insulating bearing has an insulating coating as the insulating portion on the outer diameter surface and the width surface of the base material of the outer ring, and the inner diameter side of the insulating portion of the insulating bearing that conducts to the insulation resistance measuring means. This portion may be the inner ring of the insulated bearing or the shaft.
In this configuration, it is possible to evaluate the insulation performance including the influence of rolling elements and grease interposed between the inner and outer rings.
[0010]
In this invention, the insulated bearing has a ceramic rolling element, and the rolling element serves as the insulating part, and is a part on the inner diameter side of the insulating part of the insulating bearing that is conducted to the insulation resistance measuring means. However, the inner ring or the shaft of the insulated bearing may be used.
In the case of this configuration, the insulating performance can be evaluated even if the insulating bearing is provided with insulating performance by having a ceramic rolling element.
[0011]
In these inventions, a lid member covering the width surface of the insulated bearing may be attached to the individual housing, imitating a bearing peripheral portion of a bearing-equipped actual machine including the plurality of insulated bearings.
In the case of this configuration, the insulation performance including the influence of the lid member covering the width surface of the insulation bearing in the actual machine can be evaluated, and the evaluation closer to the use in the actual machine can be performed.
[0012]
When the lid member is provided as described above, a grease pocket may be provided on the bearing facing surface of the lid member.
In the case of this configuration, it is possible to evaluate the insulation performance in a state where grease is filled in the grease pocket provided on the bearing facing surface of the lid member of the actual machine. As described above, grease is not a perfect insulator, and the insulation may be reduced due to leakage due to grease movement. Therefore, it is possible to evaluate the insulation performance in a state approximated by an actual machine equipped with a bearing.
[0013]
In these inventions, the insulator interposed between the individual housings and the base may be an insulating sheet.
When interposing an insulator, there is a problem of how to connect the individual housing and the base, but by using an insulating sheet that is a thin member, the individual housing and the base can be connected easily and firmly. can do. In addition, how and where the insulator is interposed is an important factor in the evaluation of the insulation performance, but by using an insulation sheet, it is easy to arrange the insulation part in a narrow space. In addition, it is possible to reduce the disturbance due to noise from the spread of the insulating part.
[0014]
In the present invention, rotation driving means for rotating the common shaft and load loading means for applying a radial load to the common shaft in a state where the common shaft is rotating may be provided.
In this case, it is possible to evaluate the insulation performance in a state where the bearing operation is performed by imitating the radial load acting on the shaft in the actual machine, and further, it is possible to evaluate the insulation performance in a state approximate to the actual machine.
[0015]
In these inventions, instead of a configuration in which the plurality of individual housings, the common base, and an insulator interposed between the individual housings and the base are provided, the outer rings of the insulating bearings are respectively provided. An individual housing to be fitted and an insulator interposed between the two individual housings may be provided.
In other words, the insulation performance tester for insulated bearings in this aspect is provided between a common shaft for fitting inner rings of a plurality of insulated bearings, a plurality of individual housings for fitting outer rings of the respective insulated bearings, and both individual housings. And a plurality of insulators provided for each of the insulating bearings, each of which measures an insulation resistance between a portion on the inner diameter side of the insulating portion of the insulating bearing and an individual housing corresponding to the insulating bearing. Insulation resistance measuring means.
In this configuration, the common housing can be omitted and the entire housing structure can be made up of two individual housings, or even if a common housing is provided, one insulator can be provided between the individual housings on both sides. This simplifies the configuration of the testing machine.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. The insulation performance tester of the insulation bearing of this embodiment is a test machine for evaluating the insulation performance of the insulation bearings 46 and 47 at both ends equipped on the main motor 42 of the railway vehicle described above with reference to FIG. This insulation performance tester includes a common shaft 3 for fitting the inner rings 57 and 58 of the plurality of insulation bearings 46 and 47 and a plurality of pieces for fitting the outer rings 59 and 60 of the insulation bearings 46 and 47 respectively. Individual housings 11 and 12, a common base 4 on which the individual housings 11 and 12 are installed, and a plurality of insulation resistance measuring means 1 and 2 corresponding to the respective insulating bearings 46 and 47 are provided.
[0017]
The base 4 includes a base frame 5, a pair of front and rear column bodies 6, 6 erected on the base frame 5, and a sleeve 7 that is laid across the column bodies 6, 6. The individual housings 11 and 12 are installed inside the column bodies 6 and 6 on both sides. More specifically, both ends of the sleeve 7 supported by the column bodies 6 and 6 are installed in the inner diameter hole. Between the individual housings 11 and 12 and the base 4, insulators 8 and 9 made of an insulating sheet are interposed, as shown in enlarged views in FIGS. 2 and 4. As the material of the insulators 8 and 9, a resin sheet such as a fluororesin is used. The sleeve 7 is a member simulating the motor housing 48 of the main motor 42 in FIG. The individual housings 11 and 12 are members simulating the divided housing portions 51 and 52 at both ends of the main motor 42 in FIG.
[0018]
Cover members 13 to 16 that cover both width surfaces of the insulating bearings 46 and 47 are attached to the peripheral portions of the insulating bearings 46 and 47 in the individual housings 11 and 12. These lid members 13 to 16 are provided with grease pockets 13a to 16a on the bearing facing surface. The lid members 13 and 14 corresponding to the width surfaces on both sides of one insulating bearing 46 are attached to the individual housing 11, and the lid members 15 and 16 corresponding to the width surfaces on both sides of the other insulating bearing 47 are attached to the individual housing 12, respectively. The lid members 13 and 14 corresponding to the insulating bearing 46 are provided with the labyrinth seals 19 and 20 between the pair of bearing pressing members 17 and 18 which are fitted to the shaft 3 and position the inner ring 57 of the insulating bearing 46 in the axial direction. Each is formed. Further, the lid members 15 and 16 corresponding to the insulating bearing 47 are fitted to the shaft 3 and the labyrinths 23 and 24 between the pair of bearing pressing members 21 and 22 for positioning the inner ring 58 of the insulating bearing 47 in the axial direction. Respectively. Each of the lid members 13 to 16 is a member simulating the lid members 53 to 56 of the main motor 42 in FIG. 10, and the distance between each of the lid members 13 to 16 and the corresponding insulating bearings 46 and 47, and grease. The shapes and dimensions of the pockets 13 a to 16 a are formed in the same manner as the lid members 53 to 56 of the main motor 42.
[0019]
Each of the insulating bearings 46 and 47 has insulating coatings that are insulating portions 59a and 60a on the outer diameter surface and the width surface of the outer rings 59 and 60, respectively. The insulation resistance measuring means 1 corresponding to the insulating bearing 46 measures the insulation resistance between the individual housing 11 and the portion of the insulating bearing 46 closer to the inner ring 57 than the insulating portion (insulating coating) 59a. Specifically, one electrode 1 a of the insulation resistance measuring means 1 is electrically connected to the individual housing 11, and the other electrode 1 b is electrically connected to the base material portion 59 b of the outer ring 59 of the insulating bearing 46. The one electrode 1a may be connected to the individual housing 11 by providing a hole 71 (FIG. 2) over the sleeve 7 and the insulator 8, for example. The other electrode 1b of the insulation resistance measuring means 1 has a sleeve 25 made of an insulating member fitted in a through-hole 14b that penetrates the cover member 14 in the axial direction, and the inner diameter of the outer ring 59 passes through the sleeve 25. By facing the surface, the outer ring base material portion 59b is brought into contact. The electrode 1b is made of a spring member, and is pressed against the outer ring base material portion 59b by elastic deformation thereof. A plurality of grease pockets 14a of the lid member 14 are arranged in the circumferential direction so as to prevent grease from flowing out from the grease pocket 14a as shown in the front view of FIG. 3, and the grease pockets 14a and 14a adjacent to each other are arranged. A through-hole 14b of the sleeve 25 is provided in the intermediate portion.
[0020]
The insulation resistance measuring means 2 corresponding to the other insulation bearing 47 measures the insulation resistance between the portion of the insulation bearing 47 closer to the inner ring 58 than the insulation portion (insulation coating) 60 a and the individual housing 12. . Also in this case, one electrode 2 a of the insulation resistance measuring means 2 is electrically connected to the individual housing 12, and the other electrode 2 b is electrically connected to the base material portion 60 b of the outer ring 60 of the insulating bearing 47. The other electrode 2b of the insulation resistance measuring means 2 is fitted with a sleeve 26 made of an insulating member in a through-hole 16b that penetrates the cover member 16 in the axial direction, and the inner diameter of the outer ring 60 passes through the sleeve 26. The contact with the outer ring base material portion 60b by facing the surface is the same as in the case of the insulation resistance measuring means 1 described above. The one electrode 2 a may also be connected to the individual housing 12 by providing a hole 72 (FIG. 4) across the sleeve 7 and the insulator 9.
If necessary, the holes 71 and 72 pass through the individual housings 11 and 12 and the insulating portions (insulation coatings) 59a and 60a of the insulating bearings 47 and 48, and the other electrodes 1a and 2a are passed through. The holes 71 and 72 may be connected to the base material of the outer rings 59 and 60. The holes 71 and 72 do not have to be formed when not used for inserting the electrodes 1a and 2a or the electrodes 1b and 2b.
[0021]
Further, in this insulation performance tester, load means 27 for applying a radial load to the shaft 3 is installed. The load applied to the shaft 3 by the load loading means 27 imitates the influence of the weight of the rotor 49 in the main motor 42 of FIG. The load loading means 27 includes a ring body 29 rotatably provided on the shaft 3 via a bearing 28, and a drive source such as a hydraulic cylinder in which an advance / retreat rod 31 is coupled to the ring body 29 via a joint 30. 32. The drive source 32 is fixed to the base 5 of the base 4, and a load is applied to the shaft 3 by moving the forward / backward rod 31 backward. The joint 30 is freely connectable and disengageable. A load measuring means (not shown) such as a load cell for measuring the load applied to the shaft 3 is incorporated in the joint 30.
[0022]
One end of the shaft 3 is connected to a rotation drive shaft 35 of a rotation drive source 34 formed of a motor via a joint 33. The joint 33 is freely connectable and connectable.
The joint 33 and the joint 30 in the radial load means 27 are disconnected when the insulation resistance measuring means 1 and 2 measure the insulation performance. When this insulation performance tester is capable of measuring bearing insulation during rotation of the shaft 3, an insulator (not shown) is used to insulate the shaft 3 side and the base 5 side at the joints 30 and 33. )).
[0023]
Next, an insulation performance test of the insulation bearings 46 and 47 using the insulation performance tester having the above-described configuration will be described. In this test, the rotary drive shaft 35 of the rotary drive source 34 for rotary load was connected to the shaft 3 by a joint 33, and the shaft 3 was rotated by the rotary drive source 34 in a state where a radial load was loaded by the load loading means 27. Done later. Due to this rotational drive, movement of grease sealed in the bearings 46 and 47, heat generation of the bearings 46 and 47, and the like occur, and the state approximates that at the time of use. At the time of measurement, the joints 30 and 33 are separated, and the advance / retreat rod 31 of the load load means 27 and the rotation drive shaft 35 of the rotation drive source 34 are electrically disconnected from the shaft 3. In this state, the insulation performance of the first insulation bearing 46 is measured by the insulation resistance measurement means 1, and the insulation performance of the second insulation bearing 47 is measured by the insulation resistance measurement means 2. In this case, the insulation resistance measuring means 1 measures the insulation resistance between the base material portion 59 b of the outer ring 59 in the first insulation bearing 46 and the individual housing 11 corresponding to the insulation bearing 46. The insulation resistance measuring means 2 measures the insulation resistance between the base material portion 60 b of the outer ring 60 in the second insulation bearing 47 and the individual housing 12 corresponding to the insulation bearing 47.
[0024]
As described above, according to the insulation performance testing machine having this configuration, it is possible to evaluate the insulation performance by simulating the usage state of the insulation bearings 46 and 47 incorporated in the main motor 42 of the railway vehicle. The insulation performance of the insulation bearings 46 and 47 can be evaluated. In particular, the cover members 13 to 16 that cover the width surfaces of the insulating bearings 46 and 47 are attached to the individual housings 11 and 12 in a manner similar to the bearing peripheral portion of the main motor 42 that is a bearing-equipped actual machine. The insulation performance can be evaluated in a state close to. Further, since the grease pockets 13a to 16a are provided on the bearing facing surfaces of the lid members 13 to 16, the insulation performance can be evaluated in an equipment state approximated by a bearing equipment actual machine.
When the insulation between the individual housings 11 and 12 and the base 4 is performed, it is an important factor in evaluating the insulation performance which part the insulators 8 and 9 made of an insulating sheet are inserted into. Disturbances caused by noise can be reduced by arranging the insulating portions so as to be a narrow space as in the embodiment.
If the individual housings 11 and 12 and the lid members 13 to 16 are prepared in accordance with the sizes of the insulating bearings 46 and 47, the insulating performance of the insulating bearings 46 and 47 of various sizes can be measured. It can be carried out.
[0025]
In the above embodiment, one electrode 1b, 2b of the insulation resistance measuring means 1, 2 is electrically connected to the base material portions 59b, 60b of the outer rings 59, 60, but instead of this, FIG. And as shown by a one-dot chain line in FIG. 4, the shaft 3 or the inner rings 57 and 58 of the bearings 46 and 47 may be electrically connected. In this case, the insulating bearing 46 measures the insulation resistance between the individual housing 11 and the shaft 3 or the inner ring 57. Further, in the insulating bearing 47, the insulation resistance between the individual housing 12 and the shaft 3 or the inner ring 58 is measured.
[0026]
In the above embodiment, the rotation performance of the shaft 3 is stopped and the insulation performance of each of the insulating bearings 46 and 47 is measured. However, the insulation performance may be measured while the shaft 3 is rotated by the rotary drive source 34. . In this case, it is necessary to insulate the shaft 3 from the base 4 by interposing an insulator in the joints 30 and 33. Thus, when measuring the insulation performance while rotating the shaft 3, it is also possible to evaluate how the insulation performance changes with time under the influence of grease movement and bearing heat generation due to rotation. Since grease is not a perfect insulator as described above, insulation measurement during rotation can be performed, so that more accurate insulation performance evaluation that simulates the influence of grease can be performed.
[0027]
5 and 6 show another embodiment of the present invention. In this embodiment, in the insulation performance tester of the first embodiment shown in FIGS. 1 to 4, the insulation bearings 46 and 47 to be tested have rolling elements 65 and 66 made of ceramics. The rolling elements 65 and 66 serve as insulating portions of the insulating bearings 46 and 47. The insulation resistance measuring means 1 corresponding to the insulating bearing 46 electrically connects one electrode 1b to a portion of the inner ring 57, specifically to the shaft 3 or the inner ring 57, rather than the rolling element 65 which is the insulating portion. ing. Further, the insulation resistance measuring means 2 corresponding to the insulating bearing 47 also has one electrode 2b electrically connected to the inner ring 58 portion, more specifically to the shaft 3 or the inner ring 58, than the rolling element 66 serving as the insulating portion. Connected. Other configurations are the same as those in the first embodiment.
[0028]
Also in the case of the insulation performance tester of this embodiment, the insulation performance in use can be evaluated for the insulation bearings 46 and 47 incorporated in the main motor 42 of the railway vehicle.
[0029]
FIG. 7 shows a schematic configuration of still another embodiment of the present invention. In this embodiment, the sleeve 7 of the base 4 is omitted from the first embodiment. The lid members 13 to 16, the rotation drive source 34, and the load loading means 27 in the first embodiment are not shown, but the lid members 13 to 16 are also the same as in the first embodiment in this embodiment. It may be provided or omitted. The outer ring 59 of the first insulating bearing 46 is supported by one column body 6 constituting the base 4 via the individual housing 11, and the column body 6 and the individual housing 11 are electrically separated by the insulator 8. Is done. The outer ring 60 of the second insulating bearing 47 is supported by the other column body 6 constituting the base 4 via the individual housing 12, and the column body 6 and the individual housing 12 are electrically separated by the insulator 9. Is done. The insulation resistance measuring means 1 corresponding to the insulating bearing 46 measures the insulation resistance between the individual housing 11 and the outer ring base material portion 59 b of the insulating bearing 46. The insulation providing measuring means 2 corresponding to the insulated bearing 46 measures the insulation resistance between the individual housing 12 and the outer ring base material portion 60 b of the insulated bearing 47. Other configurations are the same as those of the first embodiment.
[0030]
FIG. 8 shows still another embodiment of the present invention. Also in this embodiment, the sleeve 7 of the base 4 is omitted in the first embodiment. In this embodiment, individual housings 11A and 12A for fitting the outer rings of the respective insulating bearings 46 and 47 to be tested are provided in a column shape, and the lower end surface of these individual housings 11A and 12B and the upper surface of the base 5 are provided. Insulators 8 and 9 made of an insulating sheet are interposed therebetween. The individual housings 11A and 12B are formed by attaching bearing fitting members 11Aa and 12Aa to columnar individual housing bodies. Although the illustration of the lid members 13 to 16 in the first embodiment is omitted, the lid members 13 to 16 may be provided in the same manner as in the first embodiment or omitted in this embodiment. The rotational drive source 34 and the load loading means 27 for rotationally driving the shaft 3 are provided in the same manner as in the first embodiment, and another load loading means 27A is provided at the end of the shaft 3 on the side where the insulating bearing 47 is installed. It is connected. The load means 27 and 27A have the same structure. Other configurations are the same as those in the first embodiment. The insulation resistance measuring means 1 corresponding to the insulating bearing 46 measures the insulation resistance between the individual housing 11 and the outer ring base material portion 59 b of the insulating bearing 46. The insulation providing measuring means 2 corresponding to the insulated bearing 46 measures the insulation resistance between the individual housing 12 and the outer ring base material portion 60 b of the insulated bearing 47.
[0031]
In addition, in the said embodiment, although shown about the structure which interposed the insulators 8 and 9 between the separate housings 11 and 12 and the base 5 corresponding to each insulation bearings 46 and 47, instead of this, It is good also as what provided the separate housing which each fits the outer ring | wheel of an insulated bearing, and the insulator interposed between both separate housings. For example, in the first embodiment shown in FIG. 1, the insulators 8 and 9 between any one of the individual housings 11 and 12 and the base 4 may be omitted. In that case, what is made up of the individual housings 11 and 12 on the omitted side and the base 4 is the individual housing referred to in this modification.
[0032]
【The invention's effect】
The insulation performance testing machine for insulated bearings according to the present invention includes a common shaft for fitting inner rings of a plurality of insulated bearings, a plurality of individual housings for fitting outer rings of the respective insulated bearings, and a common for installing these individual housings. A base, an insulator interposed between each of the individual housings and the base, and a portion on the inner diameter side of the insulating bearing provided with respect to each of the insulating bearings and the insulating bearing Since the plurality of insulation resistance measuring means for measuring the insulation resistance between the individual housings corresponding to the above are provided, it is possible to evaluate the insulation performance of the individual insulation bearings in a state approximate to the actual machine use state. In particular, when a lid member covering the width surface of the insulating bearing is provided, and a grease pocket is provided in the lid member, the insulation performance can be evaluated in a state similar to that of an actual machine such as grease filling and lid mounting state.
[Brief description of the drawings]
FIG. 1 is a partially broken front view of an insulation performance testing machine for an insulated bearing according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a part of the testing machine.
FIG. 3 is a side view of a lid member in the testing machine.
FIG. 4 is an enlarged cross-sectional view of another part of the testing machine.
FIG. 5 is an enlarged cross-sectional view of a part of an insulation performance tester for an insulated bearing according to another embodiment of the present invention.
FIG. 6 is an enlarged cross-sectional view of another part of the testing machine.
FIG. 7 is a cross-sectional view showing a schematic configuration of an insulating performance tester for an insulated bearing according to still another embodiment of the present invention.
FIG. 8 is a cross-sectional view showing an insulation performance tester for an insulated bearing according to still another embodiment of the present invention.
FIG. 9 is a schematic front view of a railway vehicle carriage equipped with a main motor that is a bearing-equipped actual machine.
FIG. 10 is an enlarged sectional view of the main motor.
FIG. 11 is an explanatory diagram of a conventional example.
[Explanation of symbols]
1, 2 ... Insulation resistance measuring means
3 ... axis
4 ... Base
8, 9 ... Insulator
11, 12 ... Individual housing
13-16 ... Lid member
13a-16a ... Grease pocket
46, 47 ... Insulated bearings
57, 58 ... inner ring
59, 60 ... outer ring
59a, 60a ... Outer ring insulation coating (insulation part)
59b, 60b ... Base material portion of outer ring
65, 66 ... rolling elements (insulating part)

Claims

A common shaft for fitting inner rings of a plurality of insulated bearings, a plurality of individual housings for fitting outer rings of the respective insulated bearings, a common base for installing these individual housings, and the individual housings and the bases. And an insulation resistance provided between each of the insulating bearings and a portion on the inner diameter side of the insulating portion of the insulating bearing and an individual housing corresponding to the insulating bearing. An insulation performance tester for an insulation bearing, comprising a plurality of insulation resistance measurement means for measuring.

The insulating bearing according to claim 1, wherein the insulating bearing has an insulating coating as the insulating portion on an outer diameter surface and a width surface of a base material of an outer ring, and has an inner diameter larger than that of the insulating portion of the insulating bearing to be conducted to the insulation resistance measuring means. An insulation performance tester for an insulated bearing, wherein the side portion is a base material portion of the outer ring of the insulated bearing.

The insulating bearing according to claim 1, wherein the insulating bearing has an insulating coating as the insulating portion on an outer diameter surface and a width surface of a base material of an outer ring, and has an inner diameter larger than that of the insulating portion of the insulating bearing to be conducted to the insulation resistance measuring means. An insulation performance tester for an insulated bearing, wherein the side portion is the inner ring of the insulated bearing or the shaft.

In Claim 1, the said insulated bearing has a rolling element made from ceramics, and this rolling element becomes the said insulation part, and it is an inner diameter side rather than the insulation part of the said insulation bearing connected to the said insulation resistance measuring means. An insulation performance testing machine for an insulated bearing, wherein the portion is an inner ring of the insulated bearing or the shaft.

The insulation of an insulated bearing according to any one of claims 1 to 4, wherein a lid member that covers a width surface of the insulated bearing imitating a bearing peripheral portion of a bearing-equipped actual machine including the plurality of insulated bearings is attached to the individual housing. Performance testing machine.

6. The insulation performance tester according to claim 5, wherein a grease pocket is provided on a bearing-facing surface of the lid member.

7. The insulation performance testing machine according to claim 1, wherein the insulator interposed between each individual housing and the base is an insulation sheet.

8. The rotating drive means for rotating a common shaft according to claim 1, and load load means for applying a radial load to the common shaft in a state where the common shaft is rotating. Insulation performance testing machine for insulated bearings.

In any one of Claims 1 thru | or 8, It replaces with the structure which provides the said several separate housing, the said common base, and the insulator interposed between each said individual housing and a base, An insulation performance testing machine for an insulated bearing provided with an individual housing for fitting the outer ring of each insulated bearing and an insulator interposed between the individual housings.