JP2004162872A - Bearing lubricating oil collecting device - Google Patents
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【０００１】
【発明の属する技術分野】
この発明は軸受潤滑油回収装置に関し、たとえば立形主軸を有する工作機械の主軸装置において、固定ハウジングに対して主軸を回転自在に支持する軸受にその一方の側面側から搬送エアを用いて供給された潤滑油を回収する装置に関する。
【０００２】
【従来の技術】
たとえばマシニングセンタなどの主軸を固定ハウジングに対して回転自在に支持する軸受は、主軸回転速度の高速化の要求からｄｎ値が高くなっており、そのため軸受の潤滑方式も、オイルエア潤滑やオイルミスト潤滑などの比較的粘度の低い潤滑油を搬送エアを用いて外部から軸受の一方の側面側に供給する方式を採用することが、グリース潤滑を採用することに比べて多くなっている。オイルエア潤滑およびオイルミスト潤滑はグリース潤滑と異なり、常に外部から新しい潤滑油が供給されるため、軸受の転動寿命はグリース潤滑のように潤滑油の寿命に左右されないことも大きなメリットの一つである。
【０００３】
しかしながら、オイルエア潤滑やオイルミスト潤滑の場合には、軸受に供給された潤滑油を排出する必要がある。
【０００４】
従来、軸受に供給された使用済みの潤滑油を排出する装置として、固定ハウジングに、上下方向に伸びる貫通状のエア流路と、一端が固定ハウジングの内面における軸受の潤滑油供給側とは反対の側面側に開口するとともに他端がエア流路内面に開口した排油路とが設けられており、エア流路の上端開口からエアを送り込み、エア流路内のエアの流れにより軸受に供給された潤滑油を排油路を通してエア流路内に吸い込み、エアの流れに同伴させてエア流路の下端開口から排出するようになされたものが知られている（たとえば、特許文献１参照）。
【０００５】
また、固定ハウジングの下端面にエア流路の下端開口から排出された潤滑油を受けるオイルパンが取り付けられ、潤滑油排出パイプの一端がオイルパン内に挿入されるとともに他端が潤滑油排出位置まで伸ばされ、エアの流通するエアパイプが設けられ、エアパイプの端部と排出パイプの端部とがエアおよび潤滑油の流れ方向が同一になるように結合され、エアパイプに高速エアを供給することにより、オイルパン内の潤滑油を吸引して排出するようになされたものも知られている（たとえば、特許文献２参照）。
【０００６】
【特許文献１】
特開２００１−９０７３９号公報
【０００７】
【特許文献２】
特開２００２−１８６７６号公報
【０００８】
【発明が解決しようとする課題】
しかしながら、特許文献１に記載された装置の場合、エア流路の下端開口から排出された使用済み潤滑油が下方に滴下するので、潤滑油がワーク上に付着することがある。たとえば金型の加工のように切削液を使わずに加工を行う場合には、ワーク上に潤滑油が付着すると切り粉が潤滑油によりワーク上に付着し、仕上げ加工のさいにワーク表面を傷つけるおそれがある。
【０００９】
また、特許文献２に記載された装置の場合、主軸先端部の周囲の部分にオイルパン、潤滑油排出パイプ、エアパイプなどを配置しなければならず、ワークとの干渉を避けるためにはこれらの機器の配置が極めて困難になるおそれがある。
【００１０】
この発明の目的は、上記問題を解決し、工作機械の主軸装置に適用した場合にも、使用済み潤滑油が下方に滴下してワークに付着することがなく、しかも主軸先端部の周囲に余分な回収用の機器を配置する必要のない軸受潤滑油回収装置を提供することにある。
【００１１】
【課題を解決するための手段と発明の効果】
この発明による軸受潤滑油回収装置は、
ハウジングに対して縦軸を回転自在に支持する軸受にその一方の側面側から搬送エアを用いて供給された潤滑油を回収する装置であって、
前記ハウジングに、前記軸受の他方の側面側から前記搬送エアを排出する搬送エア排出路と、排出用エア入口および同出口を有する潤滑油排出路と、上端開口が前記搬送エア排出路に連通するとともに下方に伸び、かつ下端開口が前記潤滑油排出路に連通する滴下潤滑油回収路とが設けられており、前記ハウジング内における前記滴下潤滑油回収路の下方の部分に、前記滴下潤滑油回収路の下端開口を開放する第１の位置と同じく閉鎖する第２の位置との間で切り替えられる弁体が配され、軸受潤滑時に、重力または付勢手段の付勢力により前記弁体が前記第１位置に切り替えられて潤滑油が前記搬送エア排出路および前記滴下潤滑油回収路を通って前記潤滑油排出路内に溜まり、潤滑油排出時に、前記潤滑油排出路の排出用エア入口から送り込まれた排出用エアの圧力により前記弁体が前記第２位置に切り替えられるとともに、前記潤滑油排出路内に溜まった潤滑油が排出用エアとともに前記排出用エア出口から排出されることを特徴とするものである。
【００１２】
この発明の軸受潤滑油回収装置によれば、使用済み潤滑油は、軸受潤滑時には前記搬送エア排出路および前記滴下潤滑油回収路を通って前記潤滑油排出路内に溜められる。前記潤滑油排出路内に溜まった潤滑油は、潤滑油排出時には前記潤滑油排出路の排出用エア入口から送り込まれた排出用エアの圧力により、前記潤滑油排出路内に溜まった潤滑油が排出用エアとともに前記排出用エア出口から排出される。したがって、固定ハウジングの下方に使用済み潤滑油が滴下することが防止される。たとえば立形マシニングセンタに適用した場合、前記排出用エア出口を配管を介して潤滑油回収槽などに接続しておけば、使用済み潤滑油は自動的に潤滑油回収槽に送られ、カバーで覆われた加工室内に排出されることはなく、ワークへの付着が防止される。しかも、主軸先端部の周囲には特許文献２に記載されているような種々の機器を配置する必要がなく、ワークとの干渉のおそれがない。
【００１３】
この発明による軸受潤滑油回収装置において、前記潤滑油排出路が、前記滴下潤滑油回収路の下方を通る横向き部分を有しており、前記滴下潤滑油回収路の下端と前記横向き部分との間に前記弁体が上下動自在に配され、前記弁体が上昇することにより前記第２位置に切り替わるとともに下降することにより前記第１位置に切り替わるようになされ、前記ハウジングに、前記弁体が前記第１位置に切り替わったさいに前記滴下潤滑油回収路の下端開口と前記潤滑油排出路とを通じさせる連通路が形成されていることがある。
【００１４】
この場合、軸受潤滑時に、重力または付勢手段の付勢力により前記弁体が前記第１位置に切り替えられて潤滑油が前記搬送エア排出路および前記滴下潤滑油回収路を通って前記潤滑油排出路内に溜まり、潤滑油排出時に、前記潤滑油排出路の排出用エア入口から送り込まれた排出用エアの圧力により前記弁体が前記第２位置に切り替えられるとともに、前記潤滑油排出路内に溜まった潤滑油が排出用エアとともに前記排出用エア出口から排出されるようにする構成が、比較的簡単になる。
【００１５】
また、この発明による軸受潤滑油回収装置において、前記搬送エア排出路が、上下方向に伸びる幹部分および幹部分から分岐しかつ先端が軸受における潤滑油供給側とは反対の側面側（他方の側面側）に開口した枝部分を有しており、前記滴下潤滑油回収路の上端が前記幹部分の下端に開口していることがある。使用済み潤滑油は、搬送エア排出路内を搬送エアとともに流入し、その内周面に滴となって付着する。搬送エア排出路内の搬送エアの流速は、潤滑油の滴を重力に逆らって搬送エア排出路内を出口側に移動させるほどには速くないので、潤滑油の滴は前記幹部分の下端に最も溜まりやすくなる。そして、上述のように前記滴下潤滑油回収路の上端が前記幹部分の下端に開口していると、使用済み潤滑油は効率良く滴下潤滑油回収路を通って前記潤滑油回収路に流入する。
【００１６】
【発明の実施形態】
以下、この発明の実施形態を、図面を参照して説明する。
【００１７】
この実施形態は、この発明による軸受潤滑油回収装置を立形マシニングセンタに適用したものである。
【００１８】
図１は軸受潤滑時における軸受潤滑油回収装置の要部を示し、図２は潤滑油回収時における軸受潤滑油回収装置の要部を示す。
【００１９】
図１および図２において、鉛直状態の立形主軸（１）は固定ハウジング（２）内に配され、主軸軸受（３）によって固定ハウジング（２）に対して回転自在に支持されている。この例の場合、主軸軸受（３）は、スラスト方向およびラジアル方向の荷重を受けるアンギュラ玉軸受である。なお、図示は省略したが、アンギュラ玉軸受からなりかつ固定ハウジング（２）に対して主軸（１）を回転自在に支持する主軸軸受（３）は複数設けられており、上下両方向のスラスト荷重を受けうるように組み合わせて配置されている。
【００２０】
固定ハウジング（２）は、上下方向に長い円筒状の主ハウジング部材（４）と、主ハウジング部材（４）の下端に同心状に固定された穴あき円板状の下部ハウジング部材（５）とを備えている。
【００２１】
固定ハウジング（２）に、主軸軸受（３）にその一方の側面側から搬送エアを用いて潤滑油を供給する給油路（６）と、主軸軸受（３）の他方の側面側から前記搬送エアを排出する搬送エア排出路（７）と、排出エア入口および同出口（いずれも図示略）を有する潤滑油排出路（８）と、上端開口が搬送エア排出路（７）に連通するとともに下方に伸び、かつ下端開口が潤滑油排出路（８）に連通する滴下潤滑油回収路（９）とが設けられている。
【００２２】
給油路（６）は、主ハウジング部材（４）の内周寄りの部分に位置するとともに上下方向に伸び、かつ下端が最下部の主軸軸受（３）の若干上方に至る幹部分（６ａ）と、幹部分（６ａ）から分岐しかつ先端が主ハウジング部材（４）の内周面における主軸軸受（３）の一方の側面側に開口した枝部分（６ｂ）とよりなる。給油路（６）の枝部分（６ｂ）の先端は、主軸軸受（３）の外輪（３ａ）間に配置されたカラー（１１）に形成されかつ先端が主軸軸受（３）側を向いて開口したノズル状穴（１２）の基端に通じている。そして、潤滑油は、搬送エアを用いて給油路（６）内に送り込まれ、ノズル状穴（１２）を通って一方の側面側からオイルエア潤滑方式またはオイルミスト潤滑方式により主軸軸受（３）に供給されるようになっている。
【００２３】
搬送エア排出路（７）は、給油路（６）の幹部分（６ａ）の径方向外方に位置するとともに上下方向に伸び、かつ下端が最下部の主軸軸受（３）の若干下方に至る幹部分（７ａ）と、幹部分（７ａ）から分岐しかつ先端が主ハウジング部材（４）の内周面における主軸軸受（３）の他方の側面側（供給側とは反対の側面側）に開口した枝部分（７ｂ）とよりなる。
【００２４】
潤滑油排出路（８）は、固定ハウジング（２）の外周寄りの部分に位置するとともに搬出エア入口から下方に伸び、かつ下端が下部ハウジング部材（５）の下端部に至るエア導入側部分（８ａ）と、エア導入側部分（８ａ）の下端に連なって径方向内方に伸び、かつ滴下潤滑油回収路（９）の下方を通る横向き部分（８ｂ）と、横向き部分（８ｂ）の先端に連なって搬出エア出口に向かって伸びるエア排出側部分（８ｃ）とよりなる。
【００２５】
滴下潤滑油回収路（９）は次のようにして形成されている。下部ハウジング部材（５）の上面と、潤滑油排出路（８）の横向き部分（８ｂ）における長手方向の中央部との間に貫通穴（１３）が形成され、この貫通穴（１３）内にプラグ（１４）が嵌め止められている。プラグ（１４）の下端は貫通穴（１３）の下端よりも若干上方に位置している。また、プラグ（１４）にはこれを上下方向に貫通した貫通穴（１４ａ）が形成されている。そして、滴下潤滑油回収路（９）は、主ハウジング部材（４）下面と搬送エア排出路（７）の幹部分（７ａ）の下端との間に形成された上下方向に伸びる貫通穴（１５）、およびプラグ（１４）の貫通穴（１４ａ）によって構成されている。
【００２６】
固定ハウジング（２）における滴下潤滑油回収路（９）の下方で、かつプラグ（１４）の下端と横向き部分（８ｂ）との間の部分に、滴下潤滑油回収路（９）の下端開口を開放する第１の位置（図１参照）と同じく閉鎖する第２の位置（図２参照）との間で切り替えられる球状の弁体（１６）が、上下動自在に配されている。なお、前記第２位置に切り替えられた弁体（１６）は、プラグ（１４）の下端面における貫通穴（１４ａ）の周囲の部分に形成された凹球面状弁座（１４ｂ）に密着するようになっている。また、プラグ（１４）における貫通穴（１４ａ）内周面の上端部に内向きフランジ（１４ｃ）が形成され、この内向きフランジ（１４ａ）と弁体（１６）との間に圧縮コイルばね（１７）（付勢手段）が配置されている。したがって、弁体（１６）は、自身が受ける重力および圧縮コイルばね（１７）の付勢力により、通常は第１位置にある。弁体（１６）の重量および圧縮コイルばね（１７）の付勢力は、潤滑油排出時に潤滑油排出路（８）の排出用エア入口から送り込まれた排出用エアの圧力により弁体（１６）が第２位置に切り替えられるとともに、潤滑油排出路（８）内に溜まった潤滑油が排出用エアとともに前記排出用エア出口から排出されるような大きさとなされている。なお、弁体（１６）が、重力のみにより通常は第１位置に切り替えられるのであれば、圧縮コイルばね（１７）は必ずしも必要としない。
【００２７】
下部ハウジング部材（５）には、弁体（１６）が前記第２位置に切り替わったさいに滴下潤滑油回収路（９）の下端開口と潤滑油排出路（８）のエア排出側部分（８ｃ）とを通じさせる横向きの連通路（１８）が形成されている。
【００２８】
このような構成の軸受潤滑油回収装置において、軸受潤滑時には、潤滑油は、搬送エアを用いて給油路（６）に送り込まれ、ノズル状穴（１２）から主軸軸受（３）に向かって吹き付けられることにより主軸軸受（３）の潤滑が行われる。このとき、弁体（１６）は第１位置に切り替えられている。使用済み潤滑油は、搬送エアとともに搬送エア排出路（７）内に入り、搬送エア排出路（７）の内面に凝集する。そして、凝集した潤滑油は、滴下潤滑油回収路（９）および連通路（１８）を通って潤滑油排出路（８）内に溜められる。
【００２９】
潤滑油排出時には、潤滑油の供給が停止されるとともに、所定圧力に加圧された排出用エアが排出用エア入口から潤滑油排出路（８）内に送り込まれる。すると、排出用エアの圧力により、弁体（１６）が第２位置に切り替わって弁座（１４ｂ）に密着し、滴下潤滑油回収路（９）の下端開口が閉鎖される。そして、潤滑油排出路（８）内に溜まった潤滑油が排出用エアとともに排出用エア出口から排出される。したがって、固定ハウジング（２）の下方に使用済み潤滑油が滴下することが防止される。たとえば立形マシニングセンタに適用した場合、前記排出用エア出口を、配管を介して潤滑油回収槽などに接続しておけば、使用済み潤滑油は自動的に潤滑油回収槽に送られ、カバーで覆われた加工室内に排出されることはなく、ワークへの付着が防止される。しかも、主軸（１）先端部の周囲には特許文献２に記載されているような種々の機器を配置する必要がなく、ワークとの干渉のおそれがない。
【００３０】
なお、潤滑油の排出は、適当な時間毎に間隔をおいて行われるが、この間隔および潤滑油排出処理時間は、使用する潤滑油の量などを考慮して適当に決められる。
【図面の簡単な説明】
【図１】この発明による軸受潤滑油回収装置を備えた主軸装置の一部分を示し、弁体が第１位置に切り替えられた状態の拡大垂直断面図である。
【図２】この発明による軸受潤滑油回収装置を備えた主軸装置の一部分を示し、弁体が第２位置に切り替えられた状態の拡大垂直断面図である。
【符号の説明】
（１）：主軸
（２）：固定ハウジング
（３）：主軸軸受
（７）：搬送エア排出路
（８）：潤滑油排出路
（８ｂ）：横向き部分
（９）：滴下潤滑油回収路
（１６）：弁体
（１８）：連通路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bearing lubricating oil recovery device, for example, in a spindle device of a machine tool having a vertical spindle, which is supplied to a bearing rotatably supporting a spindle with respect to a fixed housing from one side of the bearing by using carrier air. Device for recovering lubricating oil.
[0002]
[Prior art]
For example, bearings that rotatably support a spindle such as a machining center with respect to a fixed housing are required to have a high dn value due to a demand for a higher spindle rotation speed. Therefore, the lubrication system of the bearing is also oil lubrication or oil mist lubrication. The use of a method of supplying a relatively low-viscosity lubricating oil from the outside to one side of a bearing using carrier air is more common than the use of grease lubrication. Unlike grease lubrication, oil-air lubrication and oil mist lubrication are always supplied with new lubricating oil from the outside, so one of the major advantages is that the rolling life of the bearing is not affected by the lubricating oil life unlike grease lubrication. is there.
[0003]
However, in the case of oil-air lubrication or oil mist lubrication, it is necessary to discharge the lubricating oil supplied to the bearing.
[0004]
Conventionally, as a device for discharging used lubricating oil supplied to a bearing, a fixed housing has a penetrating air flow path extending vertically, and one end is opposite to the lubricating oil supply side of the bearing on the inner surface of the fixed housing. An oil drain is provided on the side of the air passage and the other end is opened on the inner surface of the air passage. Air is supplied from the upper end opening of the air passage and supplied to the bearing by the flow of air in the air passage. A known lubricating oil is sucked into an air flow path through an oil discharge path, and is discharged from the lower end opening of the air flow path along with the flow of air (for example, see Patent Document 1). .
[0005]
An oil pan for receiving the lubricating oil discharged from the lower end opening of the air flow path is attached to a lower end surface of the fixed housing, and one end of a lubricating oil discharge pipe is inserted into the oil pan and the other end is a lubricating oil discharge position. The air pipe through which the air flows is provided, and the end of the air pipe and the end of the discharge pipe are connected so that the flow directions of the air and the lubricating oil are the same, and high-speed air is supplied to the air pipe. There is also known an apparatus in which lubricating oil in an oil pan is sucked and discharged (for example, see Patent Document 2).
[0006]
[Patent Document 1]
JP 2001-90739 A
[Patent Document 2]
Japanese Patent Application Laid-Open No. 2002-18676
[Problems to be solved by the invention]
However, in the case of the device described in Patent Literature 1, the used lubricating oil discharged from the lower end opening of the air flow path is dropped downward, so that the lubricating oil may adhere to the work. For example, when processing without using a cutting fluid, such as when processing a die, if lubricating oil adheres to the work, the chips will adhere to the work due to the lubricating oil, and will damage the work surface during finishing processing There is a risk.
[0009]
Further, in the case of the device described in
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and when applied to a spindle device of a machine tool, used lubricating oil does not drip downward and adhere to a work, and furthermore, extra lubricating oil is provided around the tip of the spindle. It is an object of the present invention to provide a bearing lubricating oil collecting device that does not require any arrangement of a collecting device.
[0011]
Means for Solving the Problems and Effects of the Invention
The bearing lubricating oil recovery device according to the present invention includes:
A device for collecting lubricating oil supplied from one side surface of a bearing rotatably supporting a longitudinal axis with respect to a housing by using carrier air,
A conveying air discharge path for discharging the transfer air from the other side of the bearing to the housing, a lubricating oil discharge path having a discharge air inlet and a discharge air outlet, and an upper end opening communicating with the transfer air discharge path. A lubricating oil collecting passage extending downwardly and having a lower end opening communicating with the lubricating oil discharging passage. The lubricating oil collecting passage is provided in a portion of the housing below the lubricating oil collecting passage. A valve element is provided which is switched between a first position at which a lower end opening of the road is opened and a second position at which the valve element is closed, and the valve element is urged by gravity or an urging force of an urging means when the bearing is lubricated. The lubricating oil is switched to the first position, and accumulates in the lubricating oil discharge passage through the conveying air discharge passage and the dripped lubricating oil recovery passage. The valve body is switched to the second position by the pressure of the discharged discharge air, and the lubricant accumulated in the lubricant discharge passage is discharged from the discharge air outlet together with the discharge air. It is assumed that.
[0012]
According to the bearing lubricating oil collecting device of the present invention, the used lubricating oil is accumulated in the lubricating oil discharging passage through the conveying air discharging passage and the dripping lubricating oil collecting passage during bearing lubrication. When the lubricating oil is discharged, the lubricating oil accumulated in the lubricating oil discharge passage is discharged by the pressure of the discharging air fed from the discharging air inlet of the lubricating oil discharging passage. The air is discharged from the discharge air outlet together with the discharge air. Therefore, the used lubricating oil is prevented from dropping below the fixed housing. For example, when applied to a vertical machining center, if the discharge air outlet is connected to a lubricating oil recovery tank via piping, the used lubricating oil is automatically sent to the lubricating oil recovery tank and covered with a cover. It is not discharged into the broken processing chamber, and adhesion to the work is prevented. Moreover, there is no need to dispose various devices as described in
[0013]
In the bearing lubricating oil recovery device according to the present invention, the lubricating oil discharge path has a horizontal portion passing below the dripping lubricating oil recovery path, and is provided between a lower end of the dripping lubricating oil recovery path and the horizontal portion. The valve body is arranged to be movable up and down, and is switched to the second position by rising the valve body and is switched to the first position by descending, and the valve body is provided in the housing. When switched to the first position, a communication path may be formed to allow the lower end opening of the dripped lubricating oil recovery path to pass through the lubricating oil discharge path.
[0014]
In this case, at the time of lubrication of the bearing, the valve body is switched to the first position by gravity or the urging force of the urging means, and the lubricating oil is discharged through the conveying air discharge path and the dripped lubricating oil recovery path. The valve body is retained in the passage, and at the time of lubricating oil discharge, the valve body is switched to the second position by the pressure of the discharge air sent from the discharge air inlet of the lubricating oil discharge passage, and the lubricating oil discharge passage The structure in which the accumulated lubricating oil is discharged from the discharge air outlet together with the discharge air is relatively simple.
[0015]
Further, in the bearing lubricating oil recovery device according to the present invention, the conveying air discharge path branches off from the trunk portion extending in the up-down direction and the trunk portion, and the tip is opposite to the lubricating oil supply side of the bearing (the other side surface side). ), The upper end of the dropped lubricating oil recovery path may be opened at the lower end of the trunk portion. The used lubricating oil flows into the conveying air discharge path together with the conveying air, and adheres as drops on the inner peripheral surface thereof. The flow velocity of the conveying air in the conveying air discharge path is not fast enough to move the lubricant oil droplets to the outlet side in the conveying air discharge path against gravity, so that the lubricating oil droplets flow to the lower end of the trunk portion. Most likely to accumulate. And, as described above, when the upper end of the dripping lubricating oil recovery path is opened at the lower end of the trunk portion, the used lubricating oil efficiently flows into the lubricating oil collecting path through the dripping lubricating oil collecting path. .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
In this embodiment, a bearing lubricating oil recovery device according to the present invention is applied to a vertical machining center.
[0018]
FIG. 1 shows a main part of the bearing lubricating oil recovery device at the time of bearing lubrication, and FIG. 2 shows a main part of the bearing lubricating oil recovery device at the time of lubricating oil recovery.
[0019]
1 and 2, a vertical main spindle (1) in a vertical state is arranged in a fixed housing (2), and is rotatably supported by a fixed housing (2) by a main shaft bearing (3). In the case of this example, the main shaft bearing (3) is an angular ball bearing that receives loads in the thrust direction and the radial direction. Although not shown, a plurality of main shaft bearings (3), which are formed of angular contact ball bearings and rotatably support the main shaft (1) with respect to the fixed housing (2), are provided. They are arranged in combination so that they can be received.
[0020]
The fixed housing (2) includes a cylindrical main housing member (4) that is long in the vertical direction, a perforated disk-shaped lower housing member (5) concentrically fixed to a lower end of the main housing member (4). It has.
[0021]
An oil supply passage (6) for supplying lubricating oil to the fixed housing (2) from one side of the main shaft bearing (3) by using the conveying air, and the conveying air from the other side of the main shaft bearing (3). , A lubricating oil discharge passage (8) having a discharge air inlet and a discharge air outlet (both not shown), an upper end opening communicating with the transfer air discharge passage (7), and a lower portion. And a drop lubricating oil recovery path (9) having a lower end opening communicating with the lubricating oil discharge path (8).
[0022]
The oil supply passage (6) is located near the inner periphery of the main housing member (4) and extends in the vertical direction, and has a lower end slightly above the lowermost main shaft bearing (3). And a branch portion (6b) branching off from the trunk portion (6a) and having a distal end opened on one side of the main shaft bearing (3) on the inner peripheral surface of the main housing member (4). The distal end of the branch portion (6b) of the oil supply passage (6) is formed in a collar (11) arranged between the outer rings (3a) of the main shaft bearing (3), and the distal end opens toward the main shaft bearing (3). The nozzle-shaped hole (12) communicates with the base end. Then, the lubricating oil is fed into the oil supply passage (6) using the carrier air, passes through the nozzle-shaped hole (12), and from one side to the main shaft bearing (3) by an oil air lubrication system or an oil mist lubrication system. Is supplied.
[0023]
The conveying air discharge passage (7) is located radially outward of the trunk portion (6a) of the oil supply passage (6), extends vertically, and has a lower end slightly below the lowermost main shaft bearing (3). A trunk portion (7a) and a tip branched from the trunk portion (7a) and having a tip located on the other side (the side opposite to the supply side) of the main shaft bearing (3) on the inner peripheral surface of the main housing member (4). It has an open branch portion (7b).
[0024]
The lubricating oil discharge passage (8) is located near the outer periphery of the fixed housing (2), extends downward from the carry-out air inlet, and has a lower end reaching the lower end of the lower housing member (5). 8a), a lateral portion (8b) extending radially inward following the lower end of the air introduction side portion (8a), and passing below the dripping lubricating oil recovery path (9), and a tip of the lateral portion (8b). And an air discharge side portion (8c) extending toward the carry-out air outlet.
[0025]
The dropped lubricating oil recovery path (9) is formed as follows. A through hole (13) is formed between the upper surface of the lower housing member (5) and the longitudinal center of the lateral portion (8b) of the lubricating oil discharge passage (8), and is formed in the through hole (13). The plug (14) is fitted. The lower end of the plug (14) is located slightly above the lower end of the through hole (13). The plug (14) has a through hole (14a) penetrating it vertically. The dripping lubricating oil recovery path (9) is provided with a vertically extending through hole (15) formed between the lower surface of the main housing member (4) and the lower end of the trunk portion (7a) of the conveying air discharge path (7). ) And the through hole (14a) of the plug (14).
[0026]
The lower end opening of the drip lubricating oil recovery passage (9) is provided below the drip lubricating oil recovery passage (9) in the fixed housing (2) and at a portion between the lower end of the plug (14) and the sideways portion (8b). A spherical valve element (16) that can be switched between a first position to be opened (see FIG. 1) and a second position to be closed (see FIG. 2) is vertically movable. The valve body (16) switched to the second position is in close contact with a concave spherical valve seat (14b) formed around the through hole (14a) on the lower end surface of the plug (14). It has become. An inward flange (14c) is formed at the upper end of the inner peripheral surface of the through hole (14a) in the plug (14), and a compression coil spring (14) is provided between the inward flange (14a) and the valve element (16). 17) (biasing means) is disposed. Therefore, the valve element (16) is normally at the first position due to the gravity received by the valve element and the urging force of the compression coil spring (17). The weight of the valve body (16) and the urging force of the compression coil spring (17) are determined by the pressure of the discharge air supplied from the discharge air inlet of the lubricating oil discharge passage (8) when the lubricating oil is discharged. Is switched to the second position, and the size is set such that the lubricating oil accumulated in the lubricating oil discharge passage (8) is discharged from the discharge air outlet together with the discharge air. If the valve element (16) is normally switched to the first position only by gravity, the compression coil spring (17) is not necessarily required.
[0027]
When the valve element (16) is switched to the second position, the lower housing member (5) has an opening at the lower end of the lubricating oil recovery passage (9) and an air discharge side portion (8c) of the lubricating oil discharge passage (8). ) Is formed.
[0028]
In the bearing lubricating oil recovery device having such a configuration, at the time of bearing lubrication, the lubricating oil is fed into the oil supply passage (6) using the carrier air, and is sprayed from the nozzle hole (12) toward the main shaft bearing (3). As a result, the main shaft bearing (3) is lubricated. At this time, the valve element (16) has been switched to the first position. The used lubricating oil enters the transfer air discharge path (7) together with the transfer air and aggregates on the inner surface of the transfer air discharge path (7). Then, the aggregated lubricating oil passes through the dripping lubricating oil recovery path (9) and the communication path (18) and is stored in the lubricating oil discharge path (8).
[0029]
When the lubricating oil is discharged, the supply of the lubricating oil is stopped, and the discharge air pressurized to a predetermined pressure is fed into the lubricating oil discharge passage (8) from the discharge air inlet. Then, due to the pressure of the discharge air, the valve element (16) is switched to the second position and is in close contact with the valve seat (14b), and the lower end opening of the dripping lubricating oil recovery path (9) is closed. Then, the lubricating oil accumulated in the lubricating oil discharge path (8) is discharged from the discharge air outlet together with the discharge air. Therefore, the used lubricating oil is prevented from dripping below the fixed housing (2). For example, when applied to a vertical machining center, if the discharge air outlet is connected to a lubricating oil recovery tank via piping, the used lubricating oil is automatically sent to the lubricating oil recovery tank and It is not discharged into the covered processing chamber, and adhesion to the work is prevented. Moreover, there is no need to dispose various devices as described in
[0030]
The discharge of the lubricating oil is performed at appropriate intervals, and the interval and the lubricating oil discharge processing time are appropriately determined in consideration of the amount of the lubricating oil used.
[Brief description of the drawings]
FIG. 1 is an enlarged vertical sectional view showing a part of a spindle device provided with a bearing lubricating oil recovery device according to the present invention, in a state where a valve body is switched to a first position.
FIG. 2 is an enlarged vertical cross-sectional view showing a part of a spindle device provided with a bearing lubricating oil recovery device according to the present invention, in a state where a valve body is switched to a second position.
[Explanation of symbols]
(1): Main shaft (2): Fixed housing (3): Main shaft bearing (7): Conveying air discharge path (8): Lubricating oil discharge path (8b): Lateral portion (9): Dropping lubricating oil recovery path (16) ): Valve body (18): Communication passage
Claims (2)
前記ハウジングに、前記軸受の他方の側面側から前記搬送エアを排出する搬送エア排出路と、排出用エア入口および同出口を有する潤滑油排出路と、上端開口が前記搬送エア排出路に連通するとともに下方に伸び、かつ下端開口が前記潤滑油排出路に連通する滴下潤滑油回収路とが設けられており、前記ハウジング内における前記滴下潤滑油回収路の下方の部分に、前記滴下潤滑油回収路の下端開口を開放する第１の位置と同じく閉鎖する第２の位置との間で切り替えられる弁体が配され、軸受潤滑時に、重力または付勢手段の付勢力により前記弁体が前記第１位置に切り替えられて潤滑油が前記搬送エア排出路および前記滴下潤滑油回収路を通って前記潤滑油排出路内に溜まり、潤滑油排出時に、前記潤滑油排出路の排出用エア入口から送り込まれた排出用エアの圧力により前記弁体が前記第２位置に切り替えられるとともに、前記潤滑油排出路内に溜まった潤滑油が排出用エアとともに前記排出用エア出口から排出されることを特徴とする軸受潤滑油回収装置。A device for collecting lubricating oil supplied from one side surface of a bearing rotatably supporting a longitudinal axis with respect to a housing by using carrier air,
A conveying air discharge path for discharging the transfer air from the other side of the bearing to the housing, a lubricating oil discharge path having a discharge air inlet and a discharge air outlet, and an upper end opening communicating with the transfer air discharge path. A lubricating oil collecting passage extending downwardly and having a lower end opening communicating with the lubricating oil discharging passage. The lubricating oil collecting passage is provided in a portion of the housing below the lubricating oil collecting passage. A valve element is provided which is switched between a first position at which a lower end opening of the road is opened and a second position at which the valve element is closed, and the valve element is urged by gravity or an urging force of an urging means when the bearing is lubricated. The lubricating oil is switched to the first position, and accumulates in the lubricating oil discharge passage through the conveying air discharge passage and the dripped lubricating oil recovery passage. The valve body is switched to the second position by the pressure of the discharged discharge air, and the lubricant accumulated in the lubricant discharge passage is discharged from the discharge air outlet together with the discharge air. Bearing lubrication oil recovery device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002331770A JP3867203B2 (en) | 2002-11-15 | 2002-11-15 | Bearing lubricant recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002331770A JP3867203B2 (en) | 2002-11-15 | 2002-11-15 | Bearing lubricant recovery device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004162872A true JP2004162872A (en) | 2004-06-10 |
| JP3867203B2 JP3867203B2 (en) | 2007-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002331770A Expired - Fee Related JP3867203B2 (en) | 2002-11-15 | 2002-11-15 | Bearing lubricant recovery device |
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| JP (1) | JP3867203B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007075988A (en) * | 2005-09-10 | 2007-03-29 | Esa Eppinger Gmbh | Method and device for lubricating bearing portion especially in machine tool or part of that |
| JP2009052583A (en) * | 2007-08-23 | 2009-03-12 | Jtekt Corp | Rolling bearing and rolling bearing structure |
| DE102009009336A1 (en) | 2008-03-31 | 2009-10-01 | Okuma Corporation | Lubricant recovery device |
| US8025443B2 (en) * | 2005-08-31 | 2011-09-27 | Alfa Laval Corporate Ab | Bearing device |
-
2002
- 2002-11-15 JP JP2002331770A patent/JP3867203B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8025443B2 (en) * | 2005-08-31 | 2011-09-27 | Alfa Laval Corporate Ab | Bearing device |
| JP2007075988A (en) * | 2005-09-10 | 2007-03-29 | Esa Eppinger Gmbh | Method and device for lubricating bearing portion especially in machine tool or part of that |
| JP2009052583A (en) * | 2007-08-23 | 2009-03-12 | Jtekt Corp | Rolling bearing and rolling bearing structure |
| DE102009009336A1 (en) | 2008-03-31 | 2009-10-01 | Okuma Corporation | Lubricant recovery device |
| US8397872B2 (en) | 2008-03-31 | 2013-03-19 | Okuma Corporation | Lubricant recovery device |
| CN101549467B (en) * | 2008-03-31 | 2013-06-26 | 大隈株式会社 | Lubricant recovery device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3867203B2 (en) | 2007-01-10 |
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