JP2003232371A - Device for lubricating main-spindle bearing - Google Patents

Device for lubricating main-spindle bearing

Info

Publication number
JP2003232371A
JP2003232371A JP2002032235A JP2002032235A JP2003232371A JP 2003232371 A JP2003232371 A JP 2003232371A JP 2002032235 A JP2002032235 A JP 2002032235A JP 2002032235 A JP2002032235 A JP 2002032235A JP 2003232371 A JP2003232371 A JP 2003232371A
Authority
JP
Japan
Prior art keywords
lubricating oil
main shaft
spindle
lubricating
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002032235A
Other languages
Japanese (ja)
Inventor
Tatsuhiro Yoshimura
辰浩 吉村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Okuma Corp
Original Assignee
Okuma Corp
Okuma Machinery Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Okuma Corp, Okuma Machinery Works Ltd filed Critical Okuma Corp
Priority to JP2002032235A priority Critical patent/JP2003232371A/en
Publication of JP2003232371A publication Critical patent/JP2003232371A/en
Pending legal-status Critical Current

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  • Auxiliary Devices For Machine Tools (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for lubricating a main-spindle bearing in which lubricating oil is prevented from remaining in a lubricating-oil suction path after working is finished. <P>SOLUTION: In the device for lubricating a main-spindle bearing, the lubricating oil is sprayed from one side of main-spindle bearings 3A-3D supporting rotatably the vertical main-spindle 1 relative to a fixed housing 2, and the oil is sucked from the other side of the main spindles 3A-3D. In the housing 2, a lubricating oil suction path 26 is provided. The suction path 26 has a vertically extending hole 26a and a horizontal hole 26c, which is branched from the hole 26a and opened on the other side of the bearings 3A-3D. A lubricating oil discharge path 28 is provided in the housing 2, which is connected to the lower end of the suction path 26 and discharges oil to the outside of the housing 2. A filter 29 is provided in the lower end of the vertical hole 26a. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】この発明は、鉛直状態の立形
主軸を有する工作機械の主軸装置において、ハウジング
に対して主軸を回転自在に支持する主軸軸受の潤滑を行
う主軸軸受潤滑装置に関する。 【0002】 【従来の技術】工作機械の立形主軸を支持する玉軸受、
ころ軸受などの主軸軸受の潤滑は、オイルエア潤滑やオ
イルミスト潤滑などの方式により、主軸回転中に連続的
に主軸軸受の一方の側面側から潤滑油を供給することに
より行われている。 【0003】従来、このような潤滑方式に用いられる主
軸軸受潤滑装置としては、ハウジングと、ハウジング内
に配された立形主軸と、ハウジングに対して主軸を回転
自在に支持する主軸軸受と、ハウジングに設けられかつ
主軸軸受の一方の側面側から潤滑油を吹き出すノズルと
を備えたものが用いられている。 【0004】ところが、工作機械において、主軸の回転
速度が高くなると、主軸軸受の玉やころなどの転動体が
高速で回転することにより発生する空気の流れによっ
て、ノズルから吹き出された潤滑油を含む空気が軌道輪
の軌道面と転動体の転動面との間に供給されにくくな
る。そこで、ハウジングに、上下方向に伸びる幹部分お
よび幹部分から分岐して先端が主軸軸受の他方の側面側
に開口した枝部分を有し、かつ主軸軸受の他方の側面側
から潤滑油を吸引する潤滑油吸引路が設けられ、主軸軸
受の一方の側面側からノズルにより潤滑油を吹き出すと
ともに、主軸軸受の他方の側面側から潤滑油吸引路を通
して潤滑油を吸引するようになされている。 【0005】 【発明が解決しようとする課題】しかしながら、潤滑油
吸引路が設けられた主軸軸受潤滑装置においては、加工
が終了し、主軸の回転が停止させられるとともに、潤滑
油の噴き出しおよび吸引が停止させられると、主軸軸受
の潤滑に供されかつごみが混入したり劣化したりした潤
滑油が潤滑油吸引路内に溜まって残存し、潤滑油吸引路
内に残存した潤滑油が主軸軸受側に逆流することがあ
る。したがって、劣化した潤滑油が主軸軸受に流入した
り、潤滑油中に含まれているごみが主軸軸受に入ったり
し、主軸軸受の寿命を短くするという問題がある。 【0006】この発明の目的は、上記問題を解決し、加
工が終了した後に潤滑油吸引路内に潤滑油が残存するこ
とを防止しうる主軸軸受潤滑装置を提供することにあ
る。 【0007】 【課題を解決するための手段と発明の効果】請求項1の
発明による主軸軸受潤滑装置は、固定ハウジング、固定
ハウジング内に配された立形主軸および主軸を固定ハウ
ジングに対して回転自在に支持する主軸軸受を備えた主
軸装置の主軸軸受潤滑装置であって、固定ハウジングに
設けられかつ主軸軸受の一方の側面側から潤滑油を吹き
付ける潤滑油供給手段と、固定ハウジングに設けられ、
かつ上下方向に伸びる幹部分および幹部分から分岐して
先端が主軸軸受の他方の側面側に開口した枝部分を有す
る潤滑油吸引路とを備えており、主軸軸受の潤滑を、主
軸軸受の一方の側面側から潤滑油を吹き付けるとともに
主軸軸受の他方の側面側から潤滑油を吸引することによ
り行うようになされた主軸軸受潤滑装置において、固定
ハウジングに、潤滑油吸引路の幹部分の下端に連なりか
つ潤滑油を固定ハウジング外に排出する潤滑油排出路が
形成され、幹部分における枝部分よりも下方の部分内ま
たは潤滑油排出路内にフィルタが配置されているもので
ある。 【0008】請求項1の発明の主軸軸受潤滑装置によれ
ば、固定ハウジングに、潤滑油吸引路の下端に連なりか
つ潤滑油を固定ハウジング外に排出する潤滑油排出路が
形成されているので、加工が終了し、主軸の回転が停止
させられるとともに、潤滑油の噴き出しおよび吸引が停
止させられた場合、主軸軸受の潤滑に供されかつごみが
混入したり劣化したりして潤滑油吸引路内に残存した潤
滑油は、自重により潤滑油排出路を通って固定ハウジン
グ外へ排出される。したがって、使用された潤滑油が主
軸軸受側に逆流することが防止され、その結果劣化した
潤滑油が主軸軸受に流入したり、潤滑油中に含まれるご
みが主軸軸受に流入したりすることが防止され、主軸軸
受の寿命が長くなる。また、加工作業中の主軸回転時に
は、潤滑油吸引路内を負圧にすることにより、主軸軸受
の他方の側面側から潤滑油が吸引されるが、潤滑油吸引
路の幹部分における枝部分よりも下方の部分内または潤
滑油排出路内にフィルタが配置されているので、潤滑油
排出路を通しての大気の吸い込みには抵抗が与えられ、
その結果潤滑油吸引路を通して潤滑油を吸引する際の吸
引力の大きな低下が防止される。したがって、吸引性能
の低下が抑制される。 【0009】請求項1の発明による主軸軸受潤滑装置に
おいて、潤滑油供給手段が、固定ハウジングに設けられ
かつ主軸軸受の一方の側面側から潤滑油を吹き付ける主
軸軸受と同数のノズルを備え、潤滑油吸引路の数が主軸
軸受と同数となされ、各主軸軸受に潤滑油を吹き出すノ
ズルとこのノズルから噴き出された潤滑油を吸引する潤
滑油吸引路の枝部の先端開口が、周方向にずれているこ
とがある。この場合、潤滑油排出路内の吸気抵抗を低減
させたり、吸引時の空気の干渉をなくしたりする上で好
ましい。 【0010】 【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。 【0011】図1および図2はこの発明による主軸軸受
潤滑装置を備えた工作機械の主軸装置の下部を示し、図
3は第1外側カラーを示し、図4は図1の要部を拡大し
て示し、図5は主軸軸受潤滑装置のノズル、潤滑油供給
パイプおよび潤滑油吸引路の配置を示す。 【0012】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(1)の下
部は、上下方向に間隔をおいて配された複数、ここでは
4つの主軸軸受(3A)(3B)(3C)(3D)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(3A)〜(3D)は全てアンギュラ玉軸受であ
る。以下、下端に位置するものから第1〜第4主軸軸受
(3A)〜(3D)と称する。 【0013】固定ハウジング(2)は、上下方向に長い段
付き円筒状の外側ハウジング部材(4)と、外側ハウジン
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。下部ハウジン
グ部材(5)には、外側ハウジング部材(4)内にはめ入れら
れる円筒状部(5a)が一体に形成されており、円筒状部(5
a)上面の外周縁部に環状凸条(5b)が全周にわたって上方
突出状に一体に形成されている。環状凸条(5b)には、全
高にわたる切り欠き(6)が、周方向に間隔をおいて複数
形成されている。 【0014】各主軸軸受(3A)〜(3D)の内輪(3a)は、主軸
(1)の外周面下端部に形成された段部(1a)と、主軸(1)の
長さの中間部にねじはめられたナット(7)とにより挟着
されることによって主軸(1)の外周に固定されており、
上下方向に隣接する内輪(3a)間には位置決め用内側カラ
ー(8)(9)(10)が配されている。各主軸軸受(3A)〜(3D)の
外輪(3b)は、外側ハウジング部材(4)の内周面における
長さの中間部に形成された段部(4a)と、下部ハウジング
部材(5)とにより挟着されることによって固定ハウジン
グ(2)の内周に固定されており、上下に隣接する外輪(3
b)間には位置決め用外側カラー(11)(12)(13)が配されて
いる。以下、第1主軸軸受(3A)と第2主軸軸受(3B)の外
輪(3b)間に位置する外側カラー(11)を第1外側カラー(1
1)、第2主軸軸受(3B)と第3主軸軸受(3C)の外輪(3b)間
に位置する外側カラー(12)を第2外側カラー(12)、第3
主軸軸受(3C)と第4主軸軸受(3D)の外輪(3b)間に位置す
る外側カラー(13)を第3外側カラー(13)とそれぞれ称す
る。第1主軸軸受(3A)の外輪(3b)の下側面に、下部ハウ
ジング部材(5)の環状凸条(5b)が当接しており、環状凸
条(5b)と外側ハウジング部材(4)の内周面との間に環状
の隙間(14)が設けられている。 【0015】図3および図4に示すように、第1外側カ
ラー(11)の内周面における上下方向の中間部に、肉厚の
比較的大きい内向きフランジ(15)が一体に形成されてい
る。また、第1外側カラー(11)の外周面における内向き
フランジ(15)よりも上側の部分の外径は、その他の部分
の外径よりも小さくなっており、ここに他の部分に比べ
て肉厚の薄い薄肉部(16)が形成されている。そして、外
側ハウジング部材(4)の内周面と第1外側カラー(11)の
薄肉部(16)の外周面との間に環状の隙間(17)が全周にわ
たって設けられている。また、薄肉部(16)には、全高に
わたる切り欠き(18)が、周方向に間隔をおいて複数形成
されている。また、第1外側カラー(11)における薄肉部
(16)よりも下側の部分に、径方向に伸びる1つの貫通穴
(19)が形成されている。第3外側カラー(13)は第1外側
カラー(11)と同じ形状で、上下逆向きになるとともに貫
通穴(19)が第1外側カラー(11)の貫通穴(19)とは周方向
(図2の時計方向)に適当な角度、たとえば270度ず
れた位置に来るように配置されている。第3外側カラー
(13)の第1外側カラー(11)と同一部分には同一符号を付
す。外側ハウジング部材(4)の内周面と第3外側カラー
(13)の薄肉部(16)の外周面との間に環状の隙間(20)が全
周にわたって形成されている。第2外側カラー(12)に
は、径方向に伸びる2つの貫通穴(図示略)が相互に長
手方向に所定の間隔をおくとともに周方向に適当な角
度、たとえば90度の間隔をおいて形成されている。第
2外側カラー(12)の一方の貫通穴は第1外側カラー(11)
の貫通穴(19)とは周方向(図2の時計方向)に適当な角
度、たとえば90度ずれた位置にあり、同じく他方の貫
通穴は第3外側カラー(13)の貫通穴(19)とは周方向(図
2の反時計方向)に、たとえば90度ずれた位置にあ
る。 【0016】主軸軸受(3A)〜(3D)の潤滑装置は、各主軸
軸受(3A)〜(3D)に対応するように上下方向に間隔をおい
て外側ハウジング部材(4)に取り付けられ、かつ主軸軸
受(3A)〜(3D)を向いた潤滑油噴出口(21a)を有する主軸
軸受(3A)〜(3D)と同数のノズル(21A)(21B)(21C)(21D)を
備えている(図5参照)。 【0017】外側ハウジング部材(4)の周壁には、主軸
(1)の軸線方向である上下方向に関して第1外側カラー
(11)、第2外側カラー(12)の下端部および上端部、なら
びに第3外側カラー(13)に対応した位置であって、かつ
主軸(1)軸線の周りに周方向に適当な間隔、好ましくは
等間隔をおいた位置に、それぞれ主軸(1)の径方向に伸
びるノズル(21A)〜(21D)と同数のノズル挿入用貫通穴(2
2)が形成されている。これらのノズル挿入用貫通穴(22)
の周方向の位置は、第1〜第3外側カラー(11)〜(13)の
貫通穴(19)と合致している。そして、これらのノズル挿
入用貫通穴(22)および第1〜第3外側カラー(11)〜(13)
の貫通穴(19)内に、それぞれノズル(21A)〜(21D)が外側
から挿入されて外側ハウジング部材(4)に固定されてい
る。以下、下端に位置するものから第1〜第4ノズル(2
1A)〜(21D)と称する。各ノズル(21A)〜(21D)の主軸(1)
径方向の内端部は、内外両カラー(8)(9)(10)(11)(12)(1
3)間に突出している。各ノズル(21A)〜(21D)の内外両カ
ラー(8)〜(13)間への突出部に潤滑油噴出口(21a)が形成
されている。第1ノズル(21A)の潤滑油噴出口(21a)は第
1主軸軸受(3A)を、第2ノズル(21B)の潤滑油噴出口(21
a)は第2主軸軸受(3B)を、第3ノズル(21C)の潤滑油噴
出口(21a)は第3主軸軸受(3C)を、第4ノズル(21D)の潤
滑油噴出口(21a)は第4主軸軸受(3D)をそれぞれ向いて
いる。 【0018】外側ハウジング部材(4)の周壁に、一端が
各ノズル挿入用貫通穴(22)の内周面に開口するとともに
他端が外側ハウジング部材(4)の外周面に開口したパイ
プ挿通穴(23)が、主軸(1)軸線の周りに周方向に間隔を
おいてノズル(21A)〜(21D)と同数形成されている。各パ
イプ挿通穴(23)は、各ノズル挿入用貫通穴(22)の内周面
から下方に伸びて外側ハウジング部材(4)の下端部に至
る第1の部分(23a)と、外側ハウジング部材(4)の下端面
と下部ハウジング部材(5)の上面との間に形成されかつ
第1部分(23a)の下端に連なって主軸(1)の周方向に伸び
る第2の部分(23b)と、第2部分(23b)の先端に連なって
上方に伸びかつ第4主軸軸受(3A)〜(3D)の上方に至る第
3の部分(23c)と、第3部分(23c)の後端に連なって主軸
(1)の径方向外方に伸びかつ外側ハウジング部材(4)の外
周面に開口した第4の部分(23d)とよりなる。 【0019】各パイプ挿通穴(23)内に、可撓性を有する
潤滑油供給パイプ(24)が、パイプ挿通穴(23)における外
側ハウジング部材(4)側への開口側から通され、その先
端部が各ノズル挿入用貫通穴(22)内に突出させられて各
ノズル(21A)〜(21D)に接続されている(図5参照)。な
お、潤滑油供給パイプ(24)は、パイプ挿通穴(23)の外側
ハウジング部材(4)外周面への開口内にはめ入れられた
止め具(25)により外側ハウジング部材(4)に固定されて
いる。 【0020】外側ハウジング部材(4)の周壁における第
1〜第4の各ノズル(21A)〜(21D)に対して周方向にほぼ
180度ずれた位置に、それぞれ潤滑油吸引路(26)が形
成されている。各潤滑油吸引路(26)は、外側ハウジング
部材(4)の下端面から上方に伸びて第4主軸軸受(3D)よ
りも上方に至る直線状の縦穴部分(26a)(幹部分)と、
縦穴部分(26a)の上端部を外側ハウジング部材(4)の外周
面に通じさせる横向き連通穴部分(26b)を有している。
第1ノズル(21A)に対して周方向にほぼ180度ずれた
位置にある潤滑油吸引路(26)は、第1主軸軸受(3A)の若
干下方の高さ位置において、縦穴部分(26a)から分岐し
て先端が隙間(14)に臨むように外側ハウジング部材(4)
の内周面に開口した横穴部分(26c)(枝部分)を有して
いる。第2ノズル(21B)に対して周方向にほぼ180度
ずれた位置にある潤滑油吸引路(26)は、第2主軸軸受(3
B)の若干下方の高さ位置において、縦穴部分(26a)から
分岐して先端が隙間(17)に臨むように外側ハウジング部
材(4)の内周面に開口した横穴部分(26c)(枝部分)を有
している。第3ノズル(21C)に対して周方向にほぼ18
0度ずれた位置にある潤滑油吸引路(26)は、第3主軸軸
受(3C)の若干上方の高さ位置において、縦穴部分(26a)
から分岐して先端が隙間(20)に臨むように外側ハウジン
グ部材(4)の内周面に開口した横穴部分(26c)(枝部分)
を有している。第4ノズル(21D)に対して周方向にほぼ
180度ずれた位置にある潤滑油吸引路(26)は、第4主
軸軸受(3A)の若干上方の高さ位置において、縦穴部分(2
6a)から分岐して先端が第4主軸軸受(3D)とナット(7)の
外向きフランジ(7a)との間の隙間(27)に臨むように外側
ハウジング部材(4)の内周面に開口した横穴部分(26c)
(枝部分)を有している。また、各潤滑油吸引路(26)の
縦穴部分(26a)の下端部内、すなわち横穴部分(26c)より
も下方の部分にフィルタ(29)が配置されている。 【0021】外側ハウジング部材(4)の下端面と下部ハ
ウジング部材(5)の上面における円筒状部(5a)よりも外
側の部分との間に、各潤滑油吸引路(26)の縦穴部分(26
a)の下端開口に連なりかつ潤滑油を固定ハウジング(2)
外に排出する潤滑油排出路(28)が形成されている。な
お、フィルタ(29)は、縦穴部分(26a)に代えて、潤滑油
排出路(28)内に配置されていてもよい。 【0022】上記構成の主軸軸受潤滑装置において、加
工時の主軸(1)回転中には、潤滑油供給ユニットから搬
送用空気とともに供給された潤滑油は、潤滑油供給パイ
プ(24)を通って各ノズル(21A)〜(21D)内に送り込まれ、
潤滑油噴出口(21a)から各主軸軸受(3A)〜(3D)の一方の
側面側に向かって噴射される。これと同時に、潤滑油吸
引路(26)内が負圧にされ、横穴部分(26c)の径方向内端
の開口、隙間(14)(17)(20)(27)、および第1〜第3主軸
軸受(3A)〜(3C)については切り欠き(6)(18)を介して各
主軸軸受(3A)〜(3D)の他方の側面側から潤滑油が吸引さ
れる。このとき、フィルタ(29)の働きによって、潤滑油
排出路(28)を通しての大気の吸い込みには抵抗が与えら
れ、その結果潤滑油の吸引力の大きな低下が防止されて
吸引性能の低下が抑制される。 【0023】加工が終了し、主軸(1)の回転が停止させ
られるとともに、潤滑油の吹き出しおよび吸引が停止さ
せられると、主軸軸受(3A)〜(3D)の潤滑に供されかつ劣
化したり、ごみが混入したりした潤滑油は、自重により
潤滑油排出路(28)を通って固定ハウジング(2)外へ排出
されるので、使用された潤滑油が潤滑油吸引路(26)を通
って主軸軸受(3A)〜(3D)側に逆流することが防止され、
その結果劣化した潤滑油が主軸軸受(3A)〜(3D)に流入し
たり、潤滑油中に含まれるごみが主軸軸受(3A)〜(3D)に
流入したりすることが防止される。したがって、主軸軸
受(3A)〜(3D)の寿命の低下が防止される。また、潤滑油
中に含まれていたごみなどはフィルタ(29)で除去され
る。 【0024】上述した実施形態においては、潤滑油排出
路内の吸気抵抗を低減させたり、吸引時の空気の干渉を
なくしたりすることを目的とする好ましい形態として、
各主軸軸受毎にそれぞれ互いに周方向にずらしてノズル
および潤滑油吸引路が設けられているが、本発明はこれ
に限定されるものではなく、ノズルおよび潤滑油吸引路
の位置や、フィルタの数および形状などは、設計上の理
由により適宜変更可能である。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle device for a machine tool having a vertical spindle in a vertical state, the spindle bearing rotatably supporting a housing with respect to a housing. The present invention relates to a main shaft bearing lubrication device that performs lubrication. A ball bearing for supporting a vertical spindle of a machine tool,
Lubrication of a main shaft bearing such as a roller bearing is performed by continuously supplying lubricating oil from one side surface of the main shaft bearing during rotation of the main shaft by a method such as oil-air lubrication or oil mist lubrication. Conventionally, a spindle bearing lubrication device used in such a lubrication system includes a housing, a vertical spindle disposed in the housing, a spindle bearing for rotatably supporting the spindle with respect to the housing, and a housing. And a nozzle that blows out lubricating oil from one side surface of the main shaft bearing. However, in a machine tool, when the rotation speed of the main shaft is increased, lubricating oil blown out from a nozzle is included due to the flow of air generated when rolling elements such as balls and rollers of the main shaft bearing rotate at high speed. It becomes difficult for air to be supplied between the raceway surface of the bearing ring and the rolling surface of the rolling element. Therefore, the housing has a trunk portion extending in the vertical direction and a branch portion branching off from the trunk portion and having a tip end opened to the other side surface of the main shaft bearing, and lubricating oil sucking lubricating oil from the other side surface side of the main shaft bearing. An oil suction path is provided, and lubricating oil is blown out from one side of the main shaft bearing by a nozzle, and the lubricating oil is sucked through the lubricating oil suction path from the other side of the main shaft bearing. [0005] However, in a spindle bearing lubrication device provided with a lubricating oil suction passage, machining is completed, rotation of the main shaft is stopped, and spouting and suction of lubricating oil are performed. When stopped, the lubricating oil used for lubrication of the main shaft bearings and mixed or degraded with dirt accumulates in the lubricating oil suction passage and remains, and the lubricating oil remaining in the lubricating oil suction passage remains on the main shaft bearing side. May flow backward. Therefore, there is a problem that the deteriorated lubricating oil flows into the main shaft bearing, and dust contained in the lubricating oil enters the main shaft bearing, thereby shortening the life of the main shaft bearing. An object of the present invention is to solve the above-mentioned problems and to provide a main shaft bearing lubricating device capable of preventing lubricating oil from remaining in a lubricating oil suction passage after machining is completed. According to the first aspect of the present invention, there is provided a spindle bearing lubricating apparatus, comprising: a stationary housing; a vertical spindle disposed in the stationary housing; and a spindle rotating relative to the stationary housing. A spindle bearing lubrication device of a spindle device having a spindle bearing that freely supports, provided in a fixed housing, and provided in a fixed housing, a lubricating oil supply unit that sprays lubricating oil from one side of the spindle bearing,
A lubricating oil suction passage having a stem portion extending in the vertical direction and a branch portion branched from the stem portion and having a tip opening on the other side of the main shaft bearing, and lubricating the main shaft bearing with one of the main shaft bearings. In a spindle bearing lubricating device adapted to spray lubricant oil from the side surface and to suck the lubricant oil from the other side surface of the spindle bearing, the fixed housing is connected to the lower end of the trunk portion of the lubricant suction passage and A lubricating oil discharge passage for discharging the lubricating oil out of the fixed housing is formed, and the filter is disposed in a portion of the trunk portion below the branch portion or in the lubricating oil discharge passage. According to the spindle bearing lubricating device of the first aspect of the present invention, since the fixed housing is provided with the lubricating oil discharge passage connected to the lower end of the lubricating oil suction passage and discharging the lubricating oil out of the fixed housing. When the machining is completed and the rotation of the spindle is stopped, and the injection and suction of the lubricating oil is stopped, the lubrication of the spindle bearing is performed, and dust is mixed in or deteriorated, and Is discharged to the outside of the fixed housing through the lubricating oil discharge path by its own weight. Therefore, the used lubricating oil is prevented from flowing back to the main shaft bearing side, and consequently the deteriorated lubricating oil flows into the main shaft bearing or dust contained in the lubricating oil flows into the main shaft bearing. And the life of the main shaft bearing is prolonged. Further, when the main shaft rotates during the machining operation, the lubricating oil is sucked from the other side surface side of the main shaft bearing by making the inside of the lubricating oil suction passage a negative pressure. Since the filter is arranged in the lower part or in the lubricating oil discharge passage, resistance is given to suction of the atmosphere through the lubricating oil discharge passage,
As a result, it is possible to prevent a large decrease in suction force when sucking the lubricating oil through the lubricating oil suction passage. Therefore, a decrease in suction performance is suppressed. In the spindle bearing lubricating apparatus according to the first aspect of the present invention, the lubricating oil supply means includes the same number of nozzles as the spindle bearing provided on the fixed housing and spraying the lubricating oil from one side of the spindle bearing. The number of suction passages is the same as that of the main shaft bearings, and the nozzles that blow out the lubricating oil to each main shaft bearing and the leading end openings of the branches of the lubricating oil suction passage that suctions the lubricating oil that is ejected from these nozzles are shifted in the circumferential direction. May be. In this case, it is preferable to reduce the intake resistance in the lubricating oil discharge path and to eliminate the interference of air at the time of suction. Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a lower portion of a spindle device of a machine tool provided with a spindle bearing lubrication device according to the present invention, FIG. 3 shows a first outer collar, and FIG. 4 is an enlarged view of a main part of FIG. FIG. 5 shows the arrangement of the nozzles, the lubricating oil supply pipe and the lubricating oil suction passage of the main shaft bearing lubricating device. 1 and 2, a vertical main spindle (1) in a vertical state is disposed in a fixed housing (2), and a lower portion of the main spindle (1) is disposed in a plurality at intervals in a vertical direction. Here, it is rotatably supported with respect to the fixed housing (2) by four main shaft bearings (3A) (3B) (3C) (3D). In this example, the main shaft bearings (3A) to (3D) are all angular ball bearings. Hereinafter, the first to fourth spindle bearings from the one located at the lower end
(3A) to (3D). The fixed housing (2) is a stepped cylindrical outer housing member (4) which is long in the vertical direction, and a perforated disk-shaped lower housing fixed concentrically to the lower end of the outer housing member (4). And a member (5). The lower housing member (5) is integrally formed with a cylindrical portion (5a) to be fitted into the outer housing member (4).
a) An annular ridge (5b) is integrally formed on the outer peripheral edge of the upper surface so as to protrude upward over the entire circumference. In the annular ridge (5b), a plurality of notches (6) extending over the entire height are formed at intervals in the circumferential direction. The inner ring (3a) of each of the spindle bearings (3A) to (3D) is
The main shaft (1) is sandwiched between a step (1a) formed at the lower end of the outer peripheral surface of the (1) and a nut (7) screwed at an intermediate portion of the length of the main shaft (1). Is fixed to the outer circumference of
Positioning inner collars (8), (9), (10) are arranged between the inner rings (3a) that are vertically adjacent to each other. The outer ring (3b) of each of the spindle bearings (3A) to (3D) has a step (4a) formed at an intermediate portion of the length on the inner peripheral surface of the outer housing member (4), and a lower housing member (5). And fixed to the inner periphery of the fixed housing (2) by the outer ring (3
The outer collars (11), (12), (13) for positioning are arranged between b). Hereinafter, the outer collar (11) located between the outer ring (3b) of the first main shaft bearing (3A) and the second main shaft bearing (3B) will be referred to as the first outer collar (1).
1) The outer collar (12) located between the outer ring (3b) of the second spindle bearing (3B) and the third spindle bearing (3C) is replaced with the second outer collar (12),
The outer collar (13) located between the outer ring (3b) of the main shaft bearing (3C) and the fourth main shaft bearing (3D) is referred to as a third outer collar (13), respectively. The annular ridge (5b) of the lower housing member (5) is in contact with the lower surface of the outer ring (3b) of the first spindle bearing (3A), and the annular ridge (5b) and the outer housing member (4) are in contact with each other. An annular gap (14) is provided between the inner peripheral surface and the inner peripheral surface. As shown in FIGS. 3 and 4, an inward flange (15) having a relatively large thickness is integrally formed at a vertically intermediate portion of the inner peripheral surface of the first outer collar (11). I have. In addition, the outer diameter of the portion above the inward flange (15) on the outer peripheral surface of the first outer collar (11) is smaller than the outer diameter of the other portions, and is here compared to the other portions. A thin portion (16) having a small thickness is formed. An annular gap (17) is provided over the entire circumference between the inner peripheral surface of the outer housing member (4) and the outer peripheral surface of the thin portion (16) of the first outer collar (11). In the thin portion (16), a plurality of notches (18) extending over the entire height are formed at intervals in the circumferential direction. Also, a thin portion of the first outer collar (11)
One through hole extending in the radial direction below the part (16)
(19) is formed. The third outer collar (13) has the same shape as the first outer collar (11), is turned upside down, and the through hole (19) is circumferentially opposite to the through hole (19) of the first outer collar (11). They are arranged so as to be shifted at an appropriate angle (clockwise in FIG. 2), for example, 270 degrees. Third outer collar
The same reference numerals as in the first outer collar (11) of (13) denote the same parts. Inner peripheral surface of outer housing member (4) and third outer collar
An annular gap (20) is formed over the entire circumference between the thin portion (16) and the outer peripheral surface of the thin portion (16). In the second outer collar 12, two radially extending through holes (not shown) are formed at a predetermined interval in the longitudinal direction and at an appropriate angle in the circumferential direction, for example, at an interval of 90 degrees. Have been. One through hole of the second outer collar (12) is the first outer collar (11)
Is positioned at an appropriate angle in the circumferential direction (clockwise direction in FIG. 2), for example, 90 degrees, and the other through hole is also the through hole (19) of the third outer collar (13). Is located at a position shifted by, for example, 90 degrees in the circumferential direction (counterclockwise direction in FIG. 2). The lubricating devices for the main shaft bearings (3A) to (3D) are mounted on the outer housing member (4) at intervals in the vertical direction so as to correspond to the main shaft bearings (3A) to (3D), and Equipped with the same number of nozzles (21A) (21B) (21C) (21D) as the main shaft bearings (3A) to (3D) having lubricating oil outlets (21a) facing the main shaft bearings (3A) to (3D) (See FIG. 5). A spindle is provided on the peripheral wall of the outer housing member (4).
The first outer collar in the vertical direction which is the axial direction of (1)
(11), at the lower end and upper end of the second outer collar (12), and at a position corresponding to the third outer collar (13), and at a suitable circumferential distance around the axis of the main shaft (1), Preferably, at equal intervals, the same number of nozzle insertion through holes (2) as the number of nozzles (21A) to (21D) extending in the radial direction of the main shaft (1).
2) is formed. These nozzle insertion holes (22)
Is aligned with the through holes (19) of the first to third outer collars (11) to (13). And these nozzle insertion through holes (22) and the first to third outer collars (11) to (13)
Nozzles (21A) to (21D) are inserted from the outside into the through holes (19), and are fixed to the outer housing member (4). Hereinafter, the first to fourth nozzles (2
1A) to (21D). Main shaft (1) of each nozzle (21A) to (21D)
The inner end in the radial direction is the inner and outer collars (8) (9) (10) (11) (12) (1
3) It protrudes between. A lubricating oil outlet (21a) is formed at a protruding portion of each of the nozzles (21A) to (21D) between the inner and outer collars (8) to (13). The lubricating oil jet (21a) of the first nozzle (21A) is connected to the first spindle bearing (3A), and the lubricating oil jet (21a) of the second nozzle (21B).
a) is the second spindle bearing (3B), the lubricating oil outlet (21a) of the third nozzle (21C) is the third main shaft bearing (3C), and the lubricating oil outlet (21a) of the fourth nozzle (21D). Indicates the fourth main shaft bearing (3D). In a peripheral wall of the outer housing member (4), one end is opened on the inner peripheral surface of each nozzle insertion through hole (22), and the other end is opened on the outer peripheral surface of the outer housing member (4). (23) are formed in the same number as the nozzles (21A) to (21D) at circumferential intervals around the axis of the main shaft (1). Each of the pipe insertion holes (23) includes a first portion (23a) extending downward from the inner peripheral surface of each of the nozzle insertion through holes (22) and reaching the lower end of the outer housing member (4), and an outer housing member. A second portion (23b) formed between the lower end surface of (4) and the upper surface of the lower housing member (5) and connected to the lower end of the first portion (23a) and extending in the circumferential direction of the main shaft (1); A third portion (23c) extending upwardly following the tip of the second portion (23b) and extending above the fourth spindle bearings (3A) to (3D); and a rear end of the third portion (23c). Connected spindle
It comprises a fourth portion (23d) extending radially outward of (1) and opening on the outer peripheral surface of the outer housing member (4). In each of the pipe insertion holes (23), a lubricating oil supply pipe (24) having flexibility is passed through an opening of the pipe insertion hole (23) toward the outer housing member (4). The tip is projected into each nozzle insertion through hole (22) and connected to each of the nozzles (21A) to (21D) (see FIG. 5). The lubricating oil supply pipe (24) is fixed to the outer housing member (4) by a stopper (25) fitted into an opening of the pipe insertion hole (23) into the outer housing member (4) outer peripheral surface. ing. A lubricating oil suction passage (26) is provided at a position on the peripheral wall of the outer housing member (4) which is displaced from the first to fourth nozzles (21A) to (21D) by approximately 180 degrees in the circumferential direction. Is formed. Each lubricating oil suction passage (26) extends straight from the lower end surface of the outer housing member (4) and extends straight above the fourth main shaft bearing (3D).
It has a horizontal communication hole portion (26b) that allows the upper end of the vertical hole portion (26a) to communicate with the outer peripheral surface of the outer housing member (4).
The lubricating oil suction passage (26), which is located at a position substantially 180 degrees in the circumferential direction with respect to the first nozzle (21A), has a vertical hole (26a) at a height slightly below the first main shaft bearing (3A). Branch from the outer housing member (4) so that the tip faces the gap (14)
And has a lateral hole portion (26c) (branch portion) opened on the inner peripheral surface of the rim. The lubricating oil suction passage (26), which is located at a position substantially 180 degrees in the circumferential direction with respect to the second nozzle (21B),
At a position slightly lower than B), a horizontal hole portion (26c) (branch) that branches from the vertical hole portion (26a) and opens on the inner peripheral surface of the outer housing member (4) so that the tip faces the gap (17). Part). About 18 in the circumferential direction with respect to the third nozzle (21C)
The lubricating oil suction passage (26), which is located at a position shifted by 0 degrees, has a vertical hole (26a) at a height slightly above the third main shaft bearing (3C).
(26c) (branch portion) that is opened from the inner peripheral surface of the outer housing member (4) so that the front end faces the clearance (20)
have. The lubricating oil suction passage (26), which is located at a position substantially 180 degrees in the circumferential direction with respect to the fourth nozzle (21D), has a vertical hole (2) at a height slightly above the fourth main shaft bearing (3A).
6a), the tip of which extends to the gap (27) between the fourth spindle bearing (3D) and the outward flange (7a) of the nut (7) on the inner peripheral surface of the outer housing member (4). Open side hole (26c)
(Branch portion). In addition, a filter (29) is arranged in the lower end of the vertical hole (26a) of each lubricating oil suction passage (26), that is, at a portion below the horizontal hole (26c). Between the lower end surface of the outer housing member (4) and a portion of the upper surface of the lower housing member (5) outside the cylindrical portion (5a), a vertical hole portion (26) of each lubricating oil suction passage (26) is provided. 26
a) Connect the lower end opening of a) and fix the lubricating oil to the housing (2).
A lubricating oil discharge passage (28) for discharging outside is formed. Note that the filter (29) may be disposed in the lubricating oil discharge passage (28) instead of the vertical hole portion (26a). In the spindle bearing lubricating apparatus having the above structure, the lubricating oil supplied together with the carrier air from the lubricating oil supply unit passes through the lubricating oil supply pipe (24) during the rotation of the main spindle (1) during machining. It is sent into each nozzle (21A) ~ (21D),
The lubricant is injected from the lubricating oil outlet (21a) toward one side of each of the spindle bearings (3A) to (3D). At the same time, a negative pressure is applied to the inside of the lubricating oil suction passage (26), the opening at the radially inner end of the lateral hole portion (26c), the gaps (14) (17) (20) (27), and the first to With respect to the three main shaft bearings (3A) to (3C), lubricating oil is sucked from the other side surfaces of the main shaft bearings (3A) to (3D) through the notches (6) and (18). At this time, the function of the filter (29) gives resistance to the suction of the atmosphere through the lubricating oil discharge passage (28), and as a result, a large decrease in the lubricating oil suction force is prevented, and a decrease in the suction performance is suppressed. Is done. When the machining is completed and the rotation of the spindle (1) is stopped, and the blowing and suction of the lubricating oil are stopped, the spindle bearings (3A) to (3D) are lubricated and deteriorated. The lubricating oil containing dirt is discharged to the outside of the fixed housing (2) through the lubricating oil discharge passage (28) by its own weight, so that the used lubricating oil passes through the lubricating oil suction passage (26). Backflow to the main shaft bearings (3A) to (3D) side is prevented,
As a result, it is possible to prevent the deteriorated lubricating oil from flowing into the main shaft bearings (3A) to (3D) and prevent the dust contained in the lubricating oil from flowing into the main shaft bearings (3A) to (3D). Therefore, the life of the spindle bearings (3A) to (3D) is prevented from being shortened. Further, dust and the like contained in the lubricating oil are removed by the filter (29). In the above-described embodiment, the preferred embodiments aiming at reducing intake resistance in the lubricating oil discharge passage and eliminating air interference at the time of suction are as follows.
A nozzle and a lubricating oil suction path are provided in each of the main shaft bearings so as to be shifted from each other in the circumferential direction. However, the present invention is not limited to this. The shape, shape, and the like can be appropriately changed for design reasons.

【図面の簡単な説明】 【図1】この発明による主軸軸受潤滑装置を備えた工作
機械の主軸装置における下部の構成を示す部分垂直断面
図(図2のI−I線断面図)である。 【図2】図1のII−II線断面図である。 【図3】第1外側カラーを示す一部切り欠き斜視図であ
る。 【図4】図1の部分拡大図である。 【図5】主軸軸受潤滑装置のノズル、潤滑油供給パイプ
および潤滑油吸引路の配置を示す一部を省略した斜視図
である。 【符号の説明】 (1):ノズル (2):固定ハウジング (3A)〜(3D):主軸軸受 (21A)〜(21D):ノズル (26):潤滑油吸引路 (26a):縦穴部分(幹部分) (26c):横穴部分(枝部分) (28):潤滑油排出路 (29):フィルタ
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial vertical sectional view (a sectional view taken along the line II of FIG. 2) showing a configuration of a lower portion of a spindle device of a machine tool provided with a spindle bearing lubrication device according to the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a partially cutaway perspective view showing a first outer collar. FIG. 4 is a partially enlarged view of FIG. 1; FIG. 5 is a perspective view in which a part of a nozzle, a lubricating oil supply pipe, and a lubricating oil suction path of a main shaft bearing lubricating device are omitted. [Description of References] (1): Nozzle (2): Fixed housing (3A) to (3D): Main shaft bearing (21A) to (21D): Nozzle (26): Lubricating oil suction path (26a): Vertical hole ( (26c): Side hole (branch) (28): Lubricating oil discharge path (29): Filter

Claims (1)

【特許請求の範囲】 【請求項1】 固定ハウジング、固定ハウジング内に配
された立形主軸および主軸を固定ハウジングに対して回
転自在に支持する主軸軸受を備えた主軸装置の主軸軸受
潤滑装置であって、固定ハウジングに設けられかつ主軸
軸受の一方の側面側から潤滑油を吹き付ける潤滑油供給
手段と、固定ハウジングに設けられ、かつ上下方向に伸
びる幹部分および幹部分から分岐して先端が主軸軸受の
他方の側面側に開口した枝部分を有する潤滑油吸引路と
を備えており、主軸軸受の潤滑を、主軸軸受の一方の側
面側から潤滑油を吹き付けるとともに主軸軸受の他方の
側面側から潤滑油を吸引することにより行うようになさ
れた主軸軸受潤滑装置において、 固定ハウジングに、潤滑油吸引路の幹部分の下端に連な
りかつ潤滑油を固定ハウジング外に排出する潤滑油排出
路が形成され、幹部分における枝部分よりも下方の部分
内または潤滑油排出路内にフィルタが配置されている主
軸軸受潤滑装置。
Claims 1. A spindle bearing lubrication device for a spindle device comprising a stationary housing, a vertical spindle disposed in the stationary housing, and a spindle bearing rotatably supporting the spindle with respect to the stationary housing. A lubricating oil supply means provided on the fixed housing and spraying lubricating oil from one side of the main shaft bearing; a stem portion provided on the fixed housing and extending in the vertical direction; A lubricating oil suction passage having a branch portion opened on the other side of the main shaft bearing, and lubricating the main shaft bearing by spraying lubricating oil from one side of the main shaft bearing and lubricating from the other side of the main shaft bearing. In a spindle bearing lubrication system designed to suck oil, the lubricating oil is fixed to the fixed housing, connecting to the lower end of the trunk of the lubricating oil suction passage. Ujingu lubricant discharge passage for discharging outside are formed, the trunk portion spindle bearing lubricating device which the filter is disposed below or within the lubricant discharge passage portion than the branch portion in.
JP2002032235A 2002-02-08 2002-02-08 Device for lubricating main-spindle bearing Pending JP2003232371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002032235A JP2003232371A (en) 2002-02-08 2002-02-08 Device for lubricating main-spindle bearing

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Application Number Priority Date Filing Date Title
JP2002032235A JP2003232371A (en) 2002-02-08 2002-02-08 Device for lubricating main-spindle bearing

Publications (1)

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JP2003232371A true JP2003232371A (en) 2003-08-22

Family

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JP2002032235A Pending JP2003232371A (en) 2002-02-08 2002-02-08 Device for lubricating main-spindle bearing

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006033555A1 (en) * 2006-07-20 2008-01-24 Deutz Ag Roller bearing with associated oil filter for e.g. automotive applications, agricultural machinery, marine diesel engines
JP2012045666A (en) * 2010-08-26 2012-03-08 Nsk Ltd Main shaft device and machine tool with the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006033555A1 (en) * 2006-07-20 2008-01-24 Deutz Ag Roller bearing with associated oil filter for e.g. automotive applications, agricultural machinery, marine diesel engines
JP2012045666A (en) * 2010-08-26 2012-03-08 Nsk Ltd Main shaft device and machine tool with the same

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