JP4184843B2

JP4184843B2 - Sealing structure for lubricating oil for motor bearings

Info

Publication number: JP4184843B2
Application number: JP2003076976A
Authority: JP
Inventors: 斎太田; 昭橋本; 展明三宅; 裕治中原; 直樹橋口; 尚功魚住
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-03-20
Filing date: 2003-03-20
Publication date: 2008-11-19
Anticipated expiration: 2023-03-20
Also published as: JP2004286081A

Description

【０００１】
【発明の属する技術分野】
この発明は、モータ等の電動機の軸受に用いられる潤滑油を封止する軸受用潤滑油の封止構造に関するものである。
【０００２】
【従来の技術】
モータ等の電動機の主軸は、使用時に高速回転する。従って、このような主軸は、ハウジング内に転がり軸受等の軸受で回転自在に支持すると共に、軸受内部に、十分な潤滑油を供給する必要がある。
【０００３】
軸受内部に潤滑油を供給する潤滑装置として、ハウジング内にグリース等の潤滑油を蓄える保油空間と、保油空間から軸受内部に連通するノズル孔とを設け、保油空間に圧力を加えることによって、間欠的あるいは連続的に適量の潤滑油を軸受内部に供給するものがある（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開２００２−１６１９２２号公報（第３頁−第５頁、図１）
【０００５】
【発明が解決しようとする課題】
しかしながら、長時間使用している間に、供給される潤滑油（グリース）の低粘度のベースオイルが遊離して、ハウジング側と主軸側との摺動部における隙間から漏れだし、主軸端に設けられたプーリや他の部品に対して悪影響を及ぼすという問題がある。
【０００６】
また、摺動部にＯリング等のシール部材を用いた場合、摩耗あるいは劣化のために定期的に交換する必要があり、メンテナンス作業が煩雑になるという問題がある。
【０００７】
さらに、長期間の使用によって劣化した潤滑油が内部に溜り、劣化した潤滑油を除去するために軸受の解体、組立の作業が必要になるという問題がある。
【０００８】
この発明は上記のような問題を解決するものであり、軸とハウジングとの機械的な摺動による封止構造を用いずに、オイルシールから漏れた潤滑油が軸方向へ漏れるのを防ぎ、さらに、潤滑油の劣化を防ぐことができる電動機用軸受の潤滑油の封止構造を提供することを目的とする。
【０００９】
【課題を解決するための手段】
この発明に係る電動機の軸受用潤滑油の封止構造は、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記軸に、上記第２の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを設けたものである。
【００１０】
また、軸と、上記軸に一対の軸受を介して支持され、上記軸を中心軸として回転するハウジングと、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸の、上記オイルシール上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材に、上記流路から外部に貫通する排出孔を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記第１の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材とを設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを設けたものである。
【００１１】
また、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを上記軸に取付け、上記ファンは、上記軸に取り付ける回転部材と、上記回転部材の径方向に設置したフィンとで構成したものである。
【００１２】
また、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記ハウジングに、上記第１の吸収部材及び第２の吸収部材に熱を供給するための加熱手段を設けたものである。
【００１３】
また、軸と、上記軸に一対の軸受を介して支持され、上記軸を中心軸として回転するハウジングと、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸の、上記オイルシール上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材に、上記流路から外部に貫通する排出孔を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記第１の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材とを設け、
上記ハウジングに、上記第１の吸収部材及び第２の吸収部材に熱を供給するための加熱手段を設けたものである。
【発明の実施の形態】
以下、この発明の実施の形態を図に基づいて説明する。
実施の形態１．
図１は、この発明の実施の形態１における潤滑油の封止構造を示す断面図、図２は、図１において、排出孔の内周側に油保持部を設けた場合を示す断面図である。
【００１４】
同図に示したように、軸受１の軸方向端部に、オイルシール５が設けられている。オイルシール５はハウジング３に固定され、先端側が回転する軸４と摺動するように設けられ、軸４の中心軸方向における軸受１からの潤滑油の漏れを抑制する。
【００１５】
オイルシール５としては、リップシール、メカニカルシールを用いることができ、また、シールが内包された密閉型の玉軸受１を用いてもよい。
【００１６】
軸受１を保持するハウジング３には、潤滑油２を軸受１に供給するための油供給孔６と、定期的に劣化した潤滑油２を排出するための油抜孔７と、油供給孔６及び油抜孔７それぞれの蓋８を設けており、軸受１の組立体を分解することなく潤滑油２を交換できるようにしている。
【００１７】
潤滑油２の交換は、油抜孔７の蓋８を外して古い潤滑油を油抜孔７から排出し、次に、新しい潤滑油を油供給孔６から供給する。また、粘度が高いグリースを交換する場合は、蓋８を外して、油供給孔６からグリースを押し込み、古いグリースが油抜孔７から押し出されて新しいグリースが油抜孔７から排出されるまでグリースを油供給孔６から押し込む。また、油抜孔７から吸引して古い潤滑油を排出して、新しい潤滑油を油供給孔６から供給することによって、簡便に潤滑油を交換することも可能である。
【００１８】
長期間の使用によって、オイルシール５の性能が劣化した場合には、オイルシール５から漏れた潤滑油２が軸４の軸端に向かう流路９に沿って流れる。
【００１９】
この発明では、軸４及びハウジング３に、オイルシール５から流路９へ漏れ出た潤滑油２を吸収する多孔質材料からなるリング形状の軸側吸収部材（第１の吸収部材）１０ａ及びハウジング側吸収部材（第２の吸収部材）１０ｂを取り付け、流路９を取り囲むようにしている。軸側吸収部材１０ａとハウジング側吸収部材１０ｂとの間には隙間１３があり、軸側吸収部材１０ａは、ハウジング側吸収部材１０ｂと非接触で回転する。
【００２０】
また、ハウジング側吸収部材１０ｂとオイルシール５との間に、ハウジング３の流路９側から外部に貫通する排出孔１１を設けている。
【００２１】
オイルシール５から漏れた潤滑油２は一部分が排出孔１１を通って、排出孔１１の外側に接続された図示していないチューブから、所定の貯留部に排出され、漏れた潤滑油２の他部分は、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収され、電動機の熱によって乾燥される。
【００２２】
また、図２に示したように、油保持部１２を設けた場合は、オイルシール５から漏れた潤滑油２は大部分が一旦、油保持部１０に保持され、排出孔１１を通って、排出孔１１の外側に接続された図示していないチューブから、所定の貯留部に排出され、漏れた潤滑油２の他部分は、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂの毛細管作用によって吸収される。
【００２３】
油保持部１２は、漏れた潤滑油２を一旦保持し、保持された潤滑油２は排出孔１１から排出されるので、潤滑油２が多量に漏れた場合に、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに到達する潤滑油２の量を減らすことができ、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂによる封止の信頼性を向上させることができる。
【００２４】
多孔質材料からなる軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂには、焼結金属、セラミック、多孔性プラスチック等を使用することができる。
【００２５】
軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収された潤滑油２は、電動機の運転中における温度上昇によって、気化成分が時間の経過とともに気化して大気に放出される。
【００２６】
以上のように、この実施の形態ではハウジング３に軸受１へ潤滑油を供給する油供給孔６と潤滑油を排出する油抜孔７とを設けたので、定期的に劣化した潤滑油を油抜孔７から排出し、油供給孔６から新しい潤滑油を軸受１へ供給することによって、軸受１の組立体を分解することなく潤滑油を交換でき、メンテナンスコストを低減することができる。
【００２７】
また、オイルシール５から流路９に漏れ出た潤滑油２の一部分を排出孔１１からハウジング３の外側に排出し、残る他部を軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂで吸収し、乾燥するようにしたので、軸４とハウジング３との間で機械的に摺動する封止構造を用いることなく、軸方向への潤滑油の漏れを防ぐことができる信頼性の高い封止構造とすることができる。
【００２８】
実施の形態２．
図３及び図４は、この発明の実施の形態２における潤滑油の封止構造を示す断面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００２９】
上記実施の形態１では、ハウジング側吸収部材１０ｂの内周面が、ハウジング３の内周面と同じレベルにあるが、この実施の形態では、図３及び図４に示したように、ハウジング側吸収部材１０ｂの内周面を、ハウジング３の中心軸方向端面近傍における内周面より突出させ、流路９に漏れ出た潤滑油２を堰止めるようにしている。
【００３０】
ハウジング側吸収部材１０ｂによって堰止められた潤滑油２は、大部分が油保持部１２に捕捉されて、排出孔１１からハウジング３の外部へ排出される。
【００３１】
図３においては、ハウジング側吸収部材１０ｂの内周面が軸側吸収部材１０ａの外周面と対向するようにしているのに対して、図４においては、ハウジング側吸収部材１０ｂの中心軸方向端面が軸側吸収部材１０ａの中心軸方向端面と対向するようにハウジング側吸収部材１０ｂの内周面から突出させ、潤滑油２を堰止めるようにするとともに、流路９の経路を複雑にしている。
【００３２】
このように、流路９の経路を複雑にすることによって、例えば、軸４が高速回転して潤滑油２がミスト状になっても、ハウジング側吸収部材１０ｂ及び軸側吸収部材１０ａに吸収されるので、軸方向にミスト状の潤滑油２が漏れ出ないようにすることができる。また、電動機の運転状態や使用環境によって高温になり、潤滑油の粘度、表面張力が小さくなって、潤滑油が流れ易くなっても、漏れを防止することができる。
【００３３】
実施の形態３．
図５は、この発明の実施の形態３における潤滑油の封止構造を示す断面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００３４】
上記実施の形態１及び２では、横置型の電動機における潤滑油の封止構造について述べたが、縦置型の電動機においても同様の潤滑油の封止構造を適用することができる。
【００３５】
図５に示したように、軸受１を保持するハウジング３には、潤滑油２を軸受１に供給するための油供給孔６と、定期的に劣化した潤滑油２を排出するための油抜孔７とを設け、油供給孔６及び油抜孔７それぞれに蓋８をしている。
【００３６】
縦置型の電動機の場合には、軸側吸収部材１０ａの流路９内の面を中心軸方向に対して傾斜させて、オイルシール５から漏れ出た潤滑油２が下方に落下し易くする。また、ハウジング側吸収部材１０ｂは、中心軸方向端面が軸側吸収部材１０ａの中心軸方向端面と対向、かつ、非接触とし、軸側吸収部材１０ａと対向する面を中心軸方向に対して傾斜させて、軸側吸収部材１０ａから落下した潤滑油２を一旦保持できる油保持部１２を形成する。
【００３７】
オイルシール５から大量に潤滑油が漏れ出した場合、漏れ出した潤滑油２は、軸側吸収部材１０ａの傾斜面を伝わって下方に落下し、ハウジング側吸収部材１０ｂの油保持部１２で一旦保持された後、排出孔１１からハウジング３の外部へ排出され、軸方向に漏れ出ることはない。
【００３８】
この実施の形態によれば、ハウジング３に軸受１へ潤滑油を供給する油供給孔６と潤滑油を排出する油抜孔７とを設けたので、定期的に劣化した潤滑油を油抜孔７から排出し、油供給孔６から新しい潤滑油を軸受１へ供給することによって、軸受１の組立体を分解することなく潤滑油を交換でき、メンテナンスコストを低減することができる。
【００３９】
また、オイルシール５から流路９に漏れ出た潤滑油２を受ける軸側吸収部材１０ａと、軸側吸収部材１０ａから落下する潤滑油２を受けるハウジング側吸収部材１０ｂとは非接触であるので、軸４とハウジング３との間で機械的に摺動させる封止構造を用いることなく、オイルシール５から漏れ出した潤滑油２を封止することができる信頼性の高い封止構造とすることができる。
【００４０】
実施の形態４．
図６は、この発明の実施の形態４における潤滑油の封止構造を示す断面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００４１】
上記実施の形態１ないし３では、軸４が回転する電動機の潤滑油の封止構造を説明したが、軸４が固定され、ハウジング３が回転する電動機についても同様の封止構造を適用できる。
【００４２】
図６に示したように、ハウジング３に油供給孔６と油抜孔７を設け、軸４及びハウジング３に、オイルシール５から流路９へ漏れ出た潤滑油２を吸収するリング形状の軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂを取り付け、軸側吸収部材１０ａに、中心軸方向に対して傾斜した排出孔１１を設けている。
【００４３】
この実施の形態によれば、ハウジング３に油供給孔６と油抜孔７を設けることによって、定期的に劣化した潤滑油を油抜孔７から排出し、油供給孔６から新しい潤滑油を軸受１へ供給することによって、軸受１の組立体を分解することなく潤滑油を交換でき、メンテナンスコストを低減することができる。
【００４４】
また、オイルシール５から流路９に漏れ出た潤滑油２の一部分を排出孔１１からハウジング３の外側に排出し、残る他部を軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂで吸収するようにしたので、軸４とハウジング３との間で機械的に摺動させることなく、軸方向への潤滑油の漏れを防ぐことができる信頼性の高い封止構造が得られる。
【００４５】
実施の形態５．
図７は、この発明の実施の形態５における潤滑油の封止構造を示す断面図であり、（ａ）は軸が回転する電動機、（ｂ）はハウジングが回転する電動機である。図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００４６】
上記実施の形態１ないし４では、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収された潤滑油を電動機の運転時における温度上昇を利用して乾燥するようにしている。
【００４７】
この実施の形態においては、図７に示したように、軸４に空気の流路となる軸溝１５を形成し、軸溝１５を介して外部の空気を吸引するファン１４を設けている。
【００４８】
ファン１４は、軸が回転する電動機（ａ）の場合にはハウジング３側に固定し、ハウジングが回転する電動機（ｂ）の場合は軸４側に固定する。
【００４９】
この実施の形態によれば、軸側吸収部材１０ａとハウジング側吸収部材１０ｂとに隙間１３から吸引され、流路９、軸溝１５を通ってファン１４から排出される電動機外部の空気によって、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収された潤滑油２が短時間で乾燥されるので、漏れ量が多い場合でも、潤滑油２の漏れを防止することができる。
【００５０】
実施の形態６．
図８は、この発明の実施の形態６における封止構造を示す断面図（ａ）及び側面図（ｂ）、図９は、フィンの形状を示す平面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００５１】
上記実施の形態５では、外部の空気を吸引して排出する経路を設け、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂ表面に空気を流通させたが、この実施の形態においては、図８に示したように、回転部材１６を軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂと対向するように軸４に固定する。
【００５２】
回転部材１５の軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂと対向する側には、半径方向にフィン１７を設けている。
【００５３】
この実施の形態によれば、回転部材１５の回転によって、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂはフィン１７から風圧を受け、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収された潤滑油２が短時間で乾燥され、潤滑油２の気化成分は回転部材１５の外周側へ排出されるので、多量の漏れがある場合でも、潤滑油２の漏れを防止することができる。
【００５４】
また、回転部材１５及びフィン１７は板で構成する等により、小型で簡単な構造とすることができる。
【００５５】
また、軸の回転方向が一方向に限定される場合は、図９に示したように、フィン１７を螺旋形状にすることによって発生する風圧を大きくすることができ、軸側吸収部材１０ａ及びハウジング側吸収部材１０ｂに吸収された潤滑油を短時間で乾燥することができる。
【００５６】
実施の形態７．
図１０は、この発明の実施の形態７における潤滑油の封止構造を示す断面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００５７】
この実施の形態では、ハウジング３の端面に凹部を形成して、この凹部にヒータ１８を埋め込んでいる。
【００５８】
ヒータ１８として、リボンヒータ、電熱線をアルミニウム等の金属に埋め込んだ埋込みヒータ、面状のラバーヒータ等を用いることができる。
【００５９】
ハウジング側吸収部材１０ｂに吸収された潤滑油２は、直接、ヒータ１８の熱によって、定期的に乾燥される。軸側吸収部材１０ａに吸収された潤滑油２は、ヒータ１８によって直接、乾燥されないが、ヒータ１８によって加熱されたハウジング３及びハウジング側吸収部材１０ｂの輻射熱によって乾燥される。
【００６０】
この実施の形態によれば、ヒータ１８によって、吸収された潤滑油２を短時間で乾燥することができるので、潤滑油の漏れ量が多い場合にも潤滑油２の漏れを防止することができる。
【００６１】
実施の形態８．
図１１は、この発明の実施の形態８における潤滑油の封止構造を示す断面図であり、図において、上記実施の形態１と同一符号は、同一部分または相当部分を示している。
【００６２】
図１１に示したように、この実施の形態では、ヒータ１８と漏れセンサ１９を併用している。漏れセンサ１９はオイルシール５の近傍に設置する。
【００６３】
潤滑油２の漏れセンサ１９として、光の反射強度変化を利用した光学式センサ、潤滑油２による抵抗変化を利用した抵抗式センサ等を用いることができる。
【００６４】
オイルシール５から潤滑油２が漏れ出すと、漏れセンサ１９で検出され、ヒータ１８に通電され、吸収された潤滑油２が乾燥されて、漏れが防止される。
【００６５】
この実施の形態によれば、漏れセンサ１９で潤滑油の漏れを検出してヒータ１８に通電するので、ヒータ１８の消費電力を節約することができる。
【００６６】
なお、上記実施の形態６において、この実施の形態８の漏れセンサ１９を併用し、漏れセンサ１９で潤滑油の漏れを検出したときに回転部材１６を回転させることもできる。
【００６７】
また、上記実施の形態４ないし８では、横置型の電動機について説明したが、縦置型の電動機にも適用することができるものである。
【００６８】
【発明の効果】
この発明に係る電動機の軸受用潤滑油の封止構造によれば、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記軸に、上記第２の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを設けたものであるので、機械的な接触摺動による封止構造を用いずに、オイルシールから漏れ出た潤滑油が軸方向に漏れるのを封止することができる信頼性の高い封止構造とすることができる。
【００６９】
また、軸と、上記軸に一対の軸受を介して支持され、上記軸を中心軸として回転するハウジングと、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸の、上記オイルシール上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材に、上記流路から外部に貫通する排出孔を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記第１の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材とを設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを設けたものであるので、機械的な接触摺動による封止構造を用いずに、オイルシールから漏れ出た潤滑油が軸方向に漏れるのを封止することができる信頼性の高い封止構造とすることができる。
【００７０】
また、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記第１の吸収部材及び第２の吸収部材の表面に空気を流通させるファンを上記軸に取付け、上記ファンは、上記軸に取り付ける回転部材と、上記回転部材の径方向に設置したフィンとで構成したものであるので、機械的な接触摺動による封止構造を用いずに、オイルシールから漏れ出た潤滑油が軸方向に漏れるのを封止することができる信頼性の高い封止構造とすることができる。
【００７１】
また、ハウジングと、上記ハウジングに一対の軸受を介して支持され、上記ハウジング内で回転する軸と、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記オイルシールの上記軸方向外側に位置して上記流路から外部に貫通する排出孔と、この排出孔の上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材を設け、
上記ハウジングに、上記第１の吸収部材及び第２の吸収部材に熱を供給するための加熱手段を設けたものであるので、機械的な接触摺動による封止構造を用いずに、オイルシールから漏れ出た潤滑油が軸方向に漏れるのを封止することができる信頼性の高い封止構造とすることができる。
【００７２】
また、軸と、上記軸に一対の軸受を介して支持され、上記軸を中心軸として回転するハウジングと、上記軸受に潤滑油を供給する油供給孔と、上記軸方向における上記潤滑油の漏れを封止するオイルシールとを備えた電動機における軸受用潤滑油の封止構造において、
上記一対の軸受けの上記軸方向外側に上記オイルシールが設けられ、
上記軸と上記ハウジングとの間に上記オイルシールから上記ハウジングの端面に向かって上記潤滑油が漏れる流路が形成され、
上記軸の、上記オイルシール上記軸方向外側に、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第１の吸収部材を設け、
上記第１の吸収部材に、上記流路から外部に貫通する排出孔を設け、
上記ハウジングに、上記一対の軸受間から上記潤滑油を供給する上記油供給孔とこの油供給孔から供給された潤滑油を上記一対の軸受間から抜き取るための油抜孔と、上記第１の吸収部材と隙間を形成して対向し、上記オイルシールから漏れ出た潤滑油を吸収するリング形状の第２の吸収部材とを設け、
上記ハウジングに、上記第１の吸収部材及び第２の吸収部材に熱を供給するための加熱手段を設けたものであるので、機械的な接触摺動による封止構造を用いずに、オイルシールから漏れ出た潤滑油が軸方向に漏れるのを封止することができる信頼性の高い封止構造とすることができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１における潤滑油の封止構造を示す断面図である。
【図２】この発明の実施の形態１における潤滑油の封止構造を示す断面図である。
【図３】この発明の実施の形態２における潤滑油の封止構造を示す断面図である。
【図４】この発明の実施の形態２における潤滑油の封止構造を示す断面図である。
【図５】この発明の実施の形態３における撥油部の潤滑油に対する作用を説明する断面図である。
【図６】この発明の実施の形態４における潤滑油の封止構造を示す断面図である。
【図７】この発明の実施の形態５における潤滑油の表面張力の作用を説明するための断面図である。
【図８】この発明の実施の形態６における潤滑油の封止構造を示す断面図及び側面図である。
【図９】この発明の実施の形態６におけるフィンの形状を示す平面図である。
【図１０】この発明の実施の形態７における潤滑油の封止構造を示す断面図である。
【図１１】この発明の実施の形態８における油切り部の作用を説明するための断面図である。
【符号の説明】
１軸受、２潤滑油、３ハウジング、４軸、５オイルシール、
６油供給孔、７油抜孔、８蓋、９流路、１０油保持部、
１０ａ軸側吸収部材、１０ｂハウジング側吸収部材、１１排出孔、
１２油保持部、１３隙間、１４ファン、１５軸溝、１６回転部材、
１７フィン、１８ヒータ、１９漏れセンサ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing lubricating oil sealing structure that seals lubricating oil used in a motor bearing such as a motor.
[0002]
[Prior art]
The main shaft of an electric motor such as a motor rotates at high speed during use. Therefore, such a main shaft needs to be rotatably supported in a housing by a bearing such as a rolling bearing, and sufficient lubricating oil needs to be supplied into the bearing.
[0003]
As a lubrication device that supplies lubricating oil to the inside of the bearing, an oil retaining space for storing lubricating oil such as grease is provided in the housing and a nozzle hole that communicates from the oil retaining space to the inside of the bearing to apply pressure to the oil retaining space. In some cases, an appropriate amount of lubricating oil is supplied into the bearing intermittently or continuously (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP 2002-161922 (page 3-5, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, during use for a long time, the low-viscosity base oil of the supplied lubricating oil (grease) is released and leaks from the gap in the sliding part between the housing side and the spindle side, and is provided at the spindle end. There is a problem of adversely affecting the pulleys and other parts.
[0006]
In addition, when a seal member such as an O-ring is used for the sliding portion, there is a problem that the maintenance work becomes complicated because it needs to be periodically replaced due to wear or deterioration.
[0007]
Furthermore, there is a problem that the lubricating oil deteriorated by long-term use accumulates inside, and the work of disassembling and assembling the bearing is required to remove the deteriorated lubricating oil.
[0008]
The present invention solves the above-mentioned problems, prevents the lubricating oil leaking from the oil seal from leaking in the axial direction without using a sealing structure by mechanical sliding between the shaft and the housing, Furthermore, it aims at providing the sealing structure of the lubricating oil of the bearing for motors which can prevent deterioration of lubricating oil.
[0009]
[Means for Solving the Problems]
A sealing structure for a lubricating oil for a bearing of an electric motor according to the present invention includes a housing, a shaft supported by the housing via a pair of bearings, rotating in the housing, and an oil supply for supplying the lubricating oil to the bearing. In the sealing structure of the lubricating oil for bearings in the electric motor provided with the hole and the oil seal that seals the leakage of the lubricating oil in the axial direction,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
The shaft is provided with a ring-shaped first absorbing member that forms a gap with the second absorbing member and faces the shaft, and absorbs lubricating oil leaked from the oil seal,
A fan for circulating air is provided on the surfaces of the first absorption member and the second absorption member.
[0010]
A shaft, a housing supported by the shaft via a pair of bearings, rotating about the shaft as a central axis, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction; In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that seals
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
A fan for circulating air is provided on the surfaces of the first absorption member and the second absorption member.
[0011]
In addition, the housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying the bearing with the lubricating oil, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
A fan that circulates air over the surfaces of the first absorbing member and the second absorbing member is attached to the shaft, and the fan includes a rotating member that is attached to the shaft and fins that are installed in the radial direction of the rotating member. It is composed.
[0012]
In addition, the housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying the bearing with the lubricating oil, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
The housing is provided with heating means for supplying heat to the first absorption member and the second absorption member.
[0013]
A shaft, a housing supported by the shaft via a pair of bearings, rotating about the shaft as a central axis, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction; In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that seals
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
The housing is provided with heating means for supplying heat to the first absorption member and the second absorption member.
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing a case where an oil retaining portion is provided on the inner peripheral side of the discharge hole in FIG. is there.
[0014]
As shown in the figure, an oil seal 5 is provided at the axial end of the bearing 1. The oil seal 5 is fixed to the housing 3 and is provided so as to slide on the rotating shaft 4 at the front end side, and suppresses leakage of lubricating oil from the bearing 1 in the central axis direction of the shaft 4.
[0015]
As the oil seal 5, a lip seal or a mechanical seal can be used, and a sealed ball bearing 1 in which the seal is included may be used.
[0016]
The housing 3 that holds the bearing 1 has an oil supply hole 6 for supplying the lubricating oil 2 to the bearing 1, an oil drain hole 7 for discharging the periodically deteriorated lubricating oil 2, an oil supply hole 6 and A lid 8 is provided for each oil drain hole 7 so that the lubricating oil 2 can be replaced without disassembling the assembly of the bearing 1.
[0017]
To replace the lubricating oil 2, the cover 8 of the oil drain hole 7 is removed, the old lubricating oil is discharged from the oil drain hole 7, and then new lubricating oil is supplied from the oil supply hole 6. When replacing grease with high viscosity, remove the lid 8 and push the grease through the oil supply hole 6 until the old grease is pushed out from the oil drain hole 7 and new grease is discharged from the oil drain hole 7. Push in from the oil supply hole 6. It is also possible to easily replace the lubricating oil by sucking out the old lubricating oil by sucking through the oil draining hole 7 and supplying new lubricating oil from the oil supplying hole 6.
[0018]
When the performance of the oil seal 5 deteriorates due to long-term use, the lubricating oil 2 leaking from the oil seal 5 flows along the flow path 9 toward the shaft end of the shaft 4.
[0019]
In this invention, the shaft 4 and the housing 3 are provided with a ring-shaped shaft-side absorbing member (first absorbing member) 10a made of a porous material that absorbs the lubricating oil 2 leaking from the oil seal 5 to the flow path 9 and the housing. A side absorption member (second absorption member) 10 b is attached so as to surround the flow path 9. There is a gap 13 between the shaft side absorbing member 10a and the housing side absorbing member 10b, and the shaft side absorbing member 10a rotates without contact with the housing side absorbing member 10b.
[0020]
In addition, a discharge hole 11 penetrating from the flow path 9 side of the housing 3 to the outside is provided between the housing side absorbing member 10 b and the oil seal 5.
[0021]
A portion of the lubricating oil 2 leaking from the oil seal 5 passes through the discharge hole 11 and is discharged from a tube (not shown) connected to the outside of the discharge hole 11 to a predetermined storage portion. The portion is absorbed by the shaft side absorbing member 10a and the housing side absorbing member 10b and dried by the heat of the electric motor.
[0022]
Further, as shown in FIG. 2, when the oil holding portion 12 is provided, most of the lubricating oil 2 leaking from the oil seal 5 is once held by the oil holding portion 10 and passes through the discharge hole 11. The other portion of the lubricating oil 2 that is discharged from a tube (not shown) connected to the outside of the discharge hole 11 to the predetermined storage portion and leaked is absorbed by the capillary action of the shaft-side absorbing member 10a and the housing-side absorbing member 10b. Is done.
[0023]
The oil holding unit 12 temporarily holds the leaked lubricating oil 2, and the held lubricating oil 2 is discharged from the discharge hole 11, so that when the lubricating oil 2 leaks in a large amount, the shaft side absorbing member 10a and the housing The amount of the lubricating oil 2 reaching the side absorbing member 10b can be reduced, and the sealing reliability by the shaft side absorbing member 10a and the housing side absorbing member 10b can be improved.
[0024]
For the shaft side absorbing member 10a and the housing side absorbing member 10b made of a porous material, sintered metal, ceramic, porous plastic, or the like can be used.
[0025]
The lubricating oil 2 absorbed by the shaft-side absorbing member 10a and the housing-side absorbing member 10b is vaporized over time and released into the atmosphere due to a temperature rise during operation of the electric motor.
[0026]
As described above, in this embodiment, the oil supply hole 6 for supplying the lubricating oil to the bearing 1 and the oil draining hole 7 for discharging the lubricating oil are provided in the housing 3, so that the periodically deteriorated lubricating oil is removed from the oil draining hole. By discharging from the oil supply port 7 and supplying new lubricating oil to the bearing 1 from the oil supply hole 6, the lubricating oil can be replaced without disassembling the assembly of the bearing 1, and the maintenance cost can be reduced.
[0027]
Further, a part of the lubricating oil 2 leaking from the oil seal 5 to the flow path 9 is discharged from the discharge hole 11 to the outside of the housing 3, and the remaining part is absorbed by the shaft side absorbing member 10a and the housing side absorbing member 10b. Since it is made to dry, a highly reliable sealing structure that can prevent leakage of lubricating oil in the axial direction without using a sealing structure that mechanically slides between the shaft 4 and the housing 3 It can be.
[0028]
Embodiment 2. FIG.
3 and 4 are sectional views showing a lubricating oil sealing structure according to the second embodiment of the present invention. In the figure, the same reference numerals as those in the first embodiment denote the same or corresponding parts. .
[0029]
In the first embodiment, the inner peripheral surface of the housing side absorbing member 10b is at the same level as the inner peripheral surface of the housing 3, but in this embodiment, as shown in FIG. 3 and FIG. The inner peripheral surface of the absorbing member 10b is protruded from the inner peripheral surface in the vicinity of the end surface in the central axis direction of the housing 3, so that the lubricating oil 2 leaking into the flow path 9 is blocked.
[0030]
Most of the lubricating oil 2 blocked by the housing-side absorbing member 10 b is captured by the oil retaining portion 12 and discharged from the discharge hole 11 to the outside of the housing 3.
[0031]
In FIG. 3, the inner peripheral surface of the housing side absorbing member 10b is opposed to the outer peripheral surface of the shaft side absorbing member 10a, whereas in FIG. 4, the end surface in the central axial direction of the housing side absorbing member 10b is used. Is protruded from the inner peripheral surface of the housing side absorbing member 10b so as to face the end surface in the central axis direction of the shaft side absorbing member 10a, and the lubricating oil 2 is dammed and the path of the flow path 9 is complicated. .
[0032]
Thus, by complicating the path of the flow path 9, for example, even if the shaft 4 rotates at a high speed and the lubricating oil 2 becomes mist, it is absorbed by the housing side absorbing member 10b and the shaft side absorbing member 10a. Therefore, it is possible to prevent the mist-like lubricating oil 2 from leaking in the axial direction. Moreover, even if the temperature of the electric motor becomes high depending on the operating state and usage environment, the viscosity and surface tension of the lubricating oil become small, and the lubricating oil can easily flow, leakage can be prevented.
[0033]
Embodiment 3 FIG.
FIG. 5 is a sectional view showing a lubricating oil sealing structure according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0034]
In the first and second embodiments, the lubricating oil sealing structure in the horizontal electric motor has been described. However, the same lubricating oil sealing structure can be applied to the vertical electric motor.
[0035]
As shown in FIG. 5, the housing 3 that holds the bearing 1 has an oil supply hole 6 for supplying the lubricating oil 2 to the bearing 1 and an oil draining hole for discharging the lubricating oil 2 that has deteriorated periodically. 7, and the oil supply hole 6 and the oil drain hole 7 are each provided with a lid 8.
[0036]
In the case of a vertically installed electric motor, the surface of the shaft side absorbing member 10a in the flow path 9 is inclined with respect to the central axis direction so that the lubricating oil 2 leaking from the oil seal 5 can easily fall downward. Further, the housing-side absorbent member 10b has an end surface in the central axis direction facing the central axial direction end surface of the shaft-side absorbent member 10a and non-contacting, and a surface facing the shaft-side absorbent member 10a is inclined with respect to the central axis direction. Thus, the oil retaining portion 12 that can temporarily retain the lubricating oil 2 dropped from the shaft side absorbing member 10a is formed.
[0037]
When a large amount of lubricating oil leaks from the oil seal 5, the leaked lubricating oil 2 falls down along the inclined surface of the shaft-side absorbing member 10a and temporarily stops at the oil holding portion 12 of the housing-side absorbing member 10b. After being held, it is discharged from the discharge hole 11 to the outside of the housing 3 and does not leak in the axial direction.
[0038]
According to this embodiment, since the oil supply hole 6 for supplying the lubricating oil to the bearing 1 and the oil drain hole 7 for discharging the lubricant are provided in the housing 3, the periodically deteriorated lubricating oil is removed from the oil drain hole 7. By discharging and supplying new lubricating oil to the bearing 1 from the oil supply hole 6, the lubricating oil can be replaced without disassembling the assembly of the bearing 1, and the maintenance cost can be reduced.
[0039]
Further, the shaft-side absorbing member 10a that receives the lubricating oil 2 leaking from the oil seal 5 to the flow path 9 and the housing-side absorbing member 10b that receives the lubricating oil 2 that falls from the shaft-side absorbing member 10a are not in contact with each other. A highly reliable sealing structure capable of sealing the lubricating oil 2 leaking from the oil seal 5 without using a sealing structure that mechanically slides between the shaft 4 and the housing 3 is provided. be able to.
[0040]
Embodiment 4 FIG.
6 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 4 of the present invention. In the drawing, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0041]
In the first to third embodiments, the sealing structure of the lubricating oil of the electric motor in which the shaft 4 rotates has been described. However, the same sealing structure can be applied to the electric motor in which the shaft 4 is fixed and the housing 3 rotates.
[0042]
As shown in FIG. 6, an oil supply hole 6 and an oil drain hole 7 are provided in the housing 3, and a ring-shaped shaft that absorbs the lubricating oil 2 leaking from the oil seal 5 to the flow path 9 in the shaft 4 and the housing 3. The side absorption member 10a and the housing side absorption member 10b are attached, and the shaft side absorption member 10a is provided with a discharge hole 11 inclined with respect to the central axis direction.
[0043]
According to this embodiment, by providing the oil supply hole 6 and the oil drain hole 7 in the housing 3, the periodically deteriorated lubricating oil is discharged from the oil drain hole 7, and new lubricant is supplied from the oil supply hole 6 to the bearing 1. Therefore, the lubricating oil can be replaced without disassembling the assembly of the bearing 1, and the maintenance cost can be reduced.
[0044]
Further, a part of the lubricating oil 2 leaking from the oil seal 5 to the flow path 9 is discharged from the discharge hole 11 to the outside of the housing 3, and the remaining part is absorbed by the shaft side absorbing member 10a and the housing side absorbing member 10b. Therefore, a highly reliable sealing structure that can prevent leakage of lubricating oil in the axial direction without mechanically sliding between the shaft 4 and the housing 3 is obtained.
[0045]
Embodiment 5 FIG.
FIG. 7 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 5 of the present invention, in which (a) is an electric motor with a rotating shaft and (b) is an electric motor with a rotating housing. In the figure, the same reference numerals as those in the first embodiment indicate the same or corresponding parts.
[0046]
In the first to fourth embodiments, the lubricating oil absorbed by the shaft-side absorbing member 10a and the housing-side absorbing member 10b is dried using the temperature rise during operation of the electric motor.
[0047]
In this embodiment, as shown in FIG. 7, a shaft groove 15 serving as an air flow path is formed in the shaft 4, and a fan 14 that sucks external air through the shaft groove 15 is provided.
[0048]
The fan 14 is fixed to the housing 3 side in the case of the electric motor (a) whose shaft rotates, and is fixed to the shaft 4 side in the case of the electric motor (b) whose housing rotates.
[0049]
According to this embodiment, the shaft is absorbed by the air outside the motor that is sucked from the gap 13 into the shaft side absorbing member 10a and the housing side absorbing member 10b and discharged from the fan 14 through the flow path 9 and the shaft groove 15. Since the lubricating oil 2 absorbed by the side absorbing member 10a and the housing side absorbing member 10b is dried in a short time, leakage of the lubricating oil 2 can be prevented even when the amount of leakage is large.
[0050]
Embodiment 6 FIG.
FIG. 8 is a cross-sectional view (a) and a side view (b) showing the sealing structure according to the sixth embodiment of the present invention, and FIG. 9 is a plan view showing the shape of the fin. The same reference numerals as 1 indicate the same or corresponding parts.
[0051]
In the fifth embodiment, a path for sucking and discharging external air is provided, and air is circulated on the surfaces of the shaft side absorbing member 10a and the housing side absorbing member 10b. In this embodiment, FIG. As shown, the rotating member 16 is fixed to the shaft 4 so as to face the shaft side absorbing member 10a and the housing side absorbing member 10b.
[0052]
Fins 17 are provided in the radial direction on the side of the rotating member 15 facing the shaft side absorbing member 10a and the housing side absorbing member 10b.
[0053]
According to this embodiment, the rotation of the rotating member 15 causes the shaft-side absorbing member 10a and the housing-side absorbing member 10b to receive wind pressure from the fins 17, and the lubrication absorbed by the shaft-side absorbing member 10a and the housing-side absorbing member 10b. Since the oil 2 is dried in a short time and the vaporized component of the lubricating oil 2 is discharged to the outer peripheral side of the rotating member 15, leakage of the lubricating oil 2 can be prevented even when there is a large amount of leakage.
[0054]
In addition, the rotating member 15 and the fins 17 can be made small and simple by, for example, being constituted by plates.
[0055]
Further, when the rotation direction of the shaft is limited to one direction, as shown in FIG. 9, the wind pressure generated by making the fins 17 spiral can be increased, and the shaft-side absorbing member 10a and the housing can be increased. The lubricating oil absorbed by the side absorbing member 10b can be dried in a short time.
[0056]
Embodiment 7 FIG.
10 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 7 of the present invention. In the drawing, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0057]
In this embodiment, a recess is formed in the end surface of the housing 3, and the heater 18 is embedded in the recess.
[0058]
As the heater 18, a ribbon heater, an embedded heater in which a heating wire is embedded in a metal such as aluminum, a planar rubber heater, or the like can be used.
[0059]
The lubricating oil 2 absorbed by the housing side absorbing member 10 b is periodically dried directly by the heat of the heater 18. The lubricating oil 2 absorbed by the shaft-side absorbing member 10a is not directly dried by the heater 18, but is dried by the radiant heat of the housing 3 and the housing-side absorbing member 10b heated by the heater 18.
[0060]
According to this embodiment, since the absorbed lubricating oil 2 can be dried in a short time by the heater 18, leakage of the lubricating oil 2 can be prevented even when the amount of lubricating oil leaks is large. .
[0061]
Embodiment 8 FIG.
FIG. 11 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 8 of the present invention. In the drawing, the same reference numerals as those in Embodiment 1 denote the same or corresponding parts.
[0062]
As shown in FIG. 11, in this embodiment, the heater 18 and the leak sensor 19 are used in combination. The leak sensor 19 is installed in the vicinity of the oil seal 5.
[0063]
As the leakage sensor 19 for the lubricating oil 2, an optical sensor using a change in light reflection intensity, a resistance sensor using a resistance change due to the lubricating oil 2, or the like can be used.
[0064]
When the lubricating oil 2 leaks from the oil seal 5, it is detected by the leakage sensor 19, and the heater 18 is energized, and the absorbed lubricating oil 2 is dried to prevent leakage.
[0065]
According to this embodiment, the leakage sensor 19 detects the leakage of the lubricating oil and energizes the heater 18, so that the power consumption of the heater 18 can be saved.
[0066]
In the sixth embodiment, the leakage sensor 19 of the eighth embodiment can be used together, and the rotation member 16 can be rotated when the leakage sensor 19 detects the leakage of the lubricating oil.
[0067]
In the fourth to eighth embodiments, the horizontal electric motor has been described. However, the electric motor can be applied to a vertical electric motor.
[0068]
【The invention's effect】
According to the sealing structure of the lubricating oil for the bearing of the electric motor according to the present invention, the lubricating oil is supplied to the housing, the shaft that is supported by the housing via the pair of bearings and rotates in the housing, and the bearing. In the sealing structure of the lubricating oil for bearings in the motor provided with the oil supply hole and the oil seal that seals the leakage of the lubricating oil in the axial direction,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
The shaft is provided with a ring-shaped first absorbing member that forms a gap with the second absorbing member and faces the shaft, and absorbs lubricating oil leaked from the oil seal ,
Since the fan for circulating air is provided on the surfaces of the first absorbing member and the second absorbing member, lubrication leaked from the oil seal without using a sealing structure by mechanical contact sliding. It can be set as the reliable sealing structure which can seal that oil leaks in an axial direction.
[0069]
A shaft, a housing supported by the shaft via a pair of bearings, rotating about the shaft as a central axis, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction; In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that seals
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
Since the fan for circulating air is provided on the surfaces of the first absorbing member and the second absorbing member, lubrication leaked from the oil seal without using a sealing structure by mechanical contact sliding. It can be set as the reliable sealing structure which can seal that oil leaks in an axial direction.
[0070]
In addition, the housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying the bearing with the lubricating oil, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
A fan that circulates air over the surfaces of the first absorbing member and the second absorbing member is attached to the shaft, and the fan includes a rotating member that is attached to the shaft and fins that are installed in the radial direction of the rotating member. Since it is configured, a highly reliable sealing structure that can seal the leakage of lubricating oil leaking from the oil seal in the axial direction without using a sealing structure by mechanical contact sliding It can be.
[0071]
In addition, the housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying the bearing with the lubricating oil, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
Since the housing is provided with heating means for supplying heat to the first absorption member and the second absorption member, an oil seal can be used without using a sealing structure by mechanical contact sliding. It is possible to provide a highly reliable sealing structure capable of sealing the leakage of the lubricating oil leaked from the shaft in the axial direction.
[0072]
A shaft, a housing supported by the shaft via a pair of bearings, rotating about the shaft as a central axis, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction; In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that seals
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
Since the housing is provided with heating means for supplying heat to the first absorption member and the second absorption member, an oil seal can be used without using a sealing structure by mechanical contact sliding. It is possible to provide a highly reliable sealing structure capable of sealing the leakage of the lubricating oil leaked from the shaft in the axial direction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view showing a lubricating oil sealing structure according to Embodiment 1 of the present invention.
FIG. 3 is a sectional view showing a lubricating oil sealing structure according to Embodiment 2 of the present invention.
FIG. 4 is a sectional view showing a lubricating oil sealing structure according to Embodiment 2 of the present invention.
FIG. 5 is a cross-sectional view for explaining the action of an oil repellent part on lubricating oil in Embodiment 3 of the present invention.
FIG. 6 is a sectional view showing a lubricating oil sealing structure according to a fourth embodiment of the present invention.
FIG. 7 is a cross-sectional view for illustrating the effect of surface tension of a lubricating oil in Embodiment 5 of the present invention.
FIGS. 8A and 8B are a sectional view and a side view showing a lubricating oil sealing structure according to a sixth embodiment of the present invention. FIGS.
FIG. 9 is a plan view showing the shape of a fin in a sixth embodiment of the invention.
FIG. 10 is a sectional view showing a lubricating oil sealing structure according to a seventh embodiment of the present invention.
FIG. 11 is a cross-sectional view for illustrating the operation of an oil drain according to an eighth embodiment of the present invention.
[Explanation of symbols]
1 bearing, 2 lubricating oil, 3 housing, 4 shafts, 5 oil seal,
6 Oil supply hole, 7 Oil drain hole, 8 Lid, 9 Flow path, 10 Oil holding part,
10a shaft side absorbing member, 10b housing side absorbing member, 11 discharge hole,
12 oil holding part, 13 gap, 14 fan, 15 shaft groove, 16 rotating member,
17 Fin, 18 Heater, 19 Leak sensor.

Claims

A housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor equipped with an oil seal,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
The shaft is provided with a ring-shaped first absorbing member that forms a gap with the second absorbing member and faces the shaft, and absorbs lubricating oil leaked from the oil seal,
A sealing structure for lubricating oil for an electric motor bearing, wherein a fan for circulating air is provided on the surfaces of the first absorbing member and the second absorbing member.

A shaft, a housing supported by the shaft via a pair of bearings and rotating around the shaft, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
A sealing structure for lubricating oil for an electric motor bearing, wherein a fan for circulating air is provided on the surfaces of the first absorbing member and the second absorbing member.

A housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor equipped with an oil seal,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from between the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
A fan that circulates air over the surfaces of the first absorbing member and the second absorbing member is attached to the shaft, and the fan includes a rotating member that is attached to the shaft and fins that are installed in the radial direction of the rotating member. A structure for sealing a lubricating oil for a motor bearing.

A housing, a shaft supported by the housing via a pair of bearings and rotating in the housing, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction are sealed. In the sealing structure of the lubricating oil for bearings in an electric motor equipped with an oil seal,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
The shaft is provided with a ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal,
The oil supply hole for supplying the lubricant from the pair of bearings to the housing, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the oil seal A discharge hole located outside in the axial direction and penetrating from the flow path to the outside, and a ring-shaped second absorption member that absorbs the lubricating oil leaking from the oil seal outside the discharge hole in the axial direction. Provided,
A sealing structure for lubricating oil for a bearing of an electric motor, wherein the housing is provided with heating means for supplying heat to the first absorbing member and the second absorbing member.

A shaft, a housing supported by the shaft via a pair of bearings and rotating around the shaft, an oil supply hole for supplying lubricating oil to the bearing, and leakage of the lubricating oil in the axial direction. In the sealing structure of the lubricating oil for bearings in an electric motor provided with an oil seal that stops,
The oil seal is provided on the outside in the axial direction of the pair of bearings;
A flow path is formed between the shaft and the housing through which the lubricating oil leaks from the oil seal toward the end surface of the housing,
A ring-shaped first absorbing member that absorbs lubricating oil leaking from the oil seal is provided on the outer side of the shaft in the axial direction of the oil seal,
The first absorption member is provided with a discharge hole penetrating outside from the flow path,
The oil supply hole for supplying the lubricant to the housing from between the pair of bearings, the oil drain hole for extracting the lubricant supplied from the oil supply hole from between the pair of bearings, and the first absorption Forming a gap with the member, and providing a ring-shaped second absorbing member that absorbs the lubricating oil leaked from the oil seal,
A sealing structure for lubricating oil for a bearing of an electric motor, wherein the housing is provided with heating means for supplying heat to the first absorbing member and the second absorbing member.

6. The sealing of lubricating oil for a bearing of an electric motor according to claim 1, wherein a leak detector for detecting leakage of lubricating oil from the oil seal is provided in the housing. Stop structure.

The sealing structure for a lubricating oil for a bearing of an electric motor according to any one of claims 1 to 6, wherein the first absorbing member and the second absorbing member are made of a porous member.

8. The sealing structure for lubricating oil for a bearing of an electric motor according to claim 7, wherein the porous member is sintered metal, ceramic or porous plastic.

9. The sealing structure for lubricating oil for a motor bearing according to any one of claims 1 to 8, wherein the electric motor is a vertical type.