JPH07145819A - Lubrication structure of bearing - Google Patents
Lubrication structure of bearingInfo
- Publication number
- JPH07145819A JPH07145819A JP40493590A JP40493590A JPH07145819A JP H07145819 A JPH07145819 A JP H07145819A JP 40493590 A JP40493590 A JP 40493590A JP 40493590 A JP40493590 A JP 40493590A JP H07145819 A JPH07145819 A JP H07145819A
- Authority
- JP
- Japan
- Prior art keywords
- lubricating oil
- bearing
- inner ring
- rotating shaft
- hollow portion
- 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.)
- Granted
Links
Landscapes
- Mounting Of Bearings Or Others (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内外両輪の間に挟持し
た鋼球等の転動体によって工作機械の主軸等の高速回転
する軸を支持するための軸受における潤滑構造に関し、
特に回転軸側に固定される内輪を貫通して転動体に潤滑
油を供給するアンダーレース方式の新規な潤滑構造に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating structure in a bearing for supporting a high-speed rotating shaft such as a main shaft of a machine tool by rolling elements such as steel balls sandwiched between inner and outer wheels.
In particular, the present invention relates to a novel underlace lubrication structure that penetrates an inner ring fixed to the rotating shaft side and supplies lubricating oil to rolling elements.
【０００２】[0002]
【従来の技術】高速回転軸を支持するボールベアリング
等の軸受の潤滑の一方式として、高速回転軸側に固定さ
れている軸受の内輪を貫通して軸受内部に開口する複数
の半径方向の給油孔を設けると共に、前記回転部材の中
心に設けられた軸方向の中空部から前記各給油孔に連通
する放射状通路を穿孔し、該回転軸の基部を通じて前記
中空部に供給された潤滑油を、遠心力によって前記放射
状通路を経て前記給油孔に送り込んで軸受の内部に放出
し、外に溢れた潤滑油を再び回収して循環させるアンダ
ーレース潤滑法がある。2. Description of the Related Art As one method of lubricating a bearing such as a ball bearing that supports a high-speed rotating shaft, a plurality of radial lubrication methods that penetrate the inner ring of the bearing fixed to the high-speed rotating shaft and open inside the bearing With a hole provided, a radial passage communicating with each of the oil supply holes is bored from an axial hollow portion provided at the center of the rotating member, and the lubricating oil supplied to the hollow portion through the base of the rotating shaft, There is an underlace lubrication method in which a lubricant is sent to the inside of the oil supply hole through the radial passage by a centrifugal force to be discharged inside the bearing, and the lubricating oil overflowing to the outside is again collected and circulated.
【０００３】[0003]
【発明が解決しようとする課題】このアンダーレース潤
滑法においては、軸受をその全周にわたって均一に冷却
するために、回転軸を貫通して多数の放射状通路を設
け、同時にこれに対応して軸受の内輪にも多数の給油孔
を設け、大量の潤滑油を供給する必要がある。しかし、
高速回転になるとこうした対策を講じても給油孔を外れ
た領域の冷却が不充分となり、このために軸受に局部的
な熱膨張の差が生じて転動面の精度が低下し、その結
果、運転中の騒音が増加し、軸受の寿命が短くなる等の
欠点を生じる。In this underrace lubrication method, in order to cool the bearing uniformly over the entire circumference thereof, a large number of radial passages are provided through the rotary shaft, and at the same time, the bearing is correspondingly provided. It is necessary to provide a large number of oil supply holes in the inner ring of and to supply a large amount of lubricating oil. But,
Even if such measures are taken at high speed rotation, the area outside the oil supply hole will not be sufficiently cooled, and this will cause a difference in the local thermal expansion of the bearings, which will reduce the accuracy of the raceways. There are drawbacks such as increased noise during operation and shortened bearing life.
【０００４】本発明は、こうした従来技術の問題点を解
消し、少ない給油量で軸受の均一な潤滑・冷却をなし得
る新規なアンダーレース潤滑構造を提供することを目的
とする。An object of the present invention is to solve the problems of the prior art and to provide a novel underrace lubrication structure capable of uniformly lubricating and cooling a bearing with a small amount of oil supply.
【０００５】[0005]
【課題を解決するための手段】この目的は、軸心に中空
部を有する回転軸の外周に固定された内輪と、転動体を
介して該内輪に対して相対回転可能に取付けられた外輪
とからなる軸受に対して、前記回転軸の中空部から潤滑
油の供給を行うアンダーレース方式の軸受の潤滑構造で
あって、前記回転軸の中空部から前記回転軸の外周に達
する少なくとも１本の半径方向の潤滑油通路を設け、前
記回転軸の外周面又は／及びこれと接する内輪の内周面
に前記潤滑油通路に連通する円周方向の溝を設け、更
に、前記潤滑油通路を含んで前記軸心に垂直な断面にお
いて、前記内輪の壁を半径方向に貫通して前記溝から軸
受の内部に達し、前記潤滑油通路とは軸心に対する位相
角度の異なる給油孔を設けたことを特徴とする軸受の潤
滑構造によって達成される。The object of the present invention is to provide an inner ring fixed to the outer periphery of a rotary shaft having a hollow portion at its shaft center, and an outer ring mounted via a rolling element so as to be rotatable relative to the inner ring. Is a lubricating structure of an underlace type bearing for supplying lubricating oil from a hollow portion of the rotating shaft to a bearing consisting of at least one of the hollow portion of the rotating shaft reaching the outer circumference of the rotating shaft. A lubricating oil passage in a radial direction is provided, a circumferential groove communicating with the lubricating oil passage is provided on an outer peripheral surface of the rotating shaft and / or an inner peripheral surface of an inner ring contacting the rotating shaft, and further includes the lubricating oil passage. In a cross section perpendicular to the shaft center, it is preferable to provide oil supply holes that penetrate the wall of the inner ring in the radial direction and reach the inside of the bearing from the groove and have a phase angle different from the lubricating oil passage with respect to the shaft center. Achieved by the characteristic bearing lubrication structure It is.
【０００６】[0006]
【作用】回転軸の中空部に供給された潤滑油は、供給圧
力および遠心力によって先ず回転軸の潤滑油通路に入
り、回転軸の外周面に達して円周溝に流れ込む。そして
軸受の内輪の内周面に沿って流れながらこれを冷却す
る。次に内輪の給油孔に到達すると遠心力によってこれ
を通過して軸受内部に流入し、転動体とレースとの間の
潤滑を行い、外部に流出して回収される。The lubricating oil supplied to the hollow portion of the rotary shaft first enters the lubricating oil passage of the rotary shaft by the supply pressure and the centrifugal force, reaches the outer peripheral surface of the rotary shaft, and flows into the circumferential groove. Then, it cools while flowing along the inner peripheral surface of the inner ring of the bearing. Next, when it reaches the oil supply hole of the inner ring, it passes through this due to centrifugal force, flows into the inside of the bearing, lubricates between the rolling elements and the race, and flows out to the outside to be collected.
【０００７】以下、図面に示す好適実施例に基づいて、
本発明を更に詳細に説明する。Based on the preferred embodiment shown in the drawings,
The present invention will be described in more detail.
【０００８】[0008]
【実施例】図１は本発明の軸受潤滑構造の軸方向の側断
面図、図２は同じく図１のＸ−Ｘ線に沿う横断面図であ
る。回転軸１は中心軸Ａに沿う中空部２を有し、その開
放された基部は固定部材３によって中心に所定の開口を
残して閉鎖され、ポンプ（図示しない）に接続された潤
滑油パイプ４がこれを通じて中空部２に向かって開口し
ている。この回転軸１は前後２箇所に軸受５を具えてい
る。1 is a side sectional view in the axial direction of a bearing lubrication structure of the present invention, and FIG. 2 is a transverse sectional view taken along line XX of FIG. The rotary shaft 1 has a hollow portion 2 along the central axis A, the open base portion of which is closed by a fixing member 3 leaving a predetermined opening at the center, and a lubricating oil pipe 4 connected to a pump (not shown). Through which the hollow portion 2 opens. The rotary shaft 1 has bearings 5 at two front and rear positions.
【０００９】前記軸受５は、内輪６，外輪７，及びその
間にリテーナ８によって回転可能に位置決めされて挟持
された鋼球９で構成され、内輪６は前記回転軸１の外周
に固定され、静止位置に保持された外輪７に対して回転
可能に回転軸１を支持している。この軸受５に対する潤
滑のために、前記回転軸１には各軸受５の位置に対応し
て、中空部２から外周面に達する半径方向の２本の潤滑
油通路１０，１１が設けられている。各通路１０，１１
は中心軸Ａに対する位相角が互いに１８０°異なると共
に、軸方向の位置も異なってそれぞれ軸受の内輪６の左
方領域と右方領域に開口するようなっている。The bearing 5 is composed of an inner ring 6, an outer ring 7 and a steel ball 9 which is rotatably positioned and sandwiched by a retainer 8 therebetween, and the inner ring 6 is fixed to the outer periphery of the rotary shaft 1 and is stationary. The rotating shaft 1 is rotatably supported by the outer ring 7 held at the position. In order to lubricate the bearing 5, the rotary shaft 1 is provided with two lubricating oil passages 10 and 11 in the radial direction from the hollow portion 2 to the outer peripheral surface, corresponding to the positions of the bearings 5. . Each passage 10, 11
The phase angles with respect to the central axis A differ from each other by 180 °, and the positions in the axial direction also differ, so that the inner ring 6 of the bearing opens in the left region and the right region, respectively.
【００１０】前記潤滑油通路１０，１１の開口位置を通
って前記回転軸１の外周面には、円周方向にそれぞれ環
状溝１２，１３が設けられている。又、前記環状溝１２
を含み中心軸Ａに垂直な断面には、前記潤滑油通路１０
に対して１８０°位相の異なる方向に内輪６の壁を貫通
して前記環状溝１２と軸受５の内部とに連通する給油孔
１４が設けられている。これと同様に、前記環状溝１３
を含み中心軸Ａに垂直な断面には、前記潤滑油通路１１
に対して１８０°位相の異なる方向に内輪６の壁を貫通
して前記環状溝１３と軸受５の内部とに連通する給油孔
１５が設けられている。Circular grooves 12 and 13 are provided in the circumferential direction on the outer peripheral surface of the rotary shaft 1 passing through the opening positions of the lubricating oil passages 10 and 11, respectively. Also, the annular groove 12
The lubricating oil passage 10 is provided in a cross section that includes and is perpendicular to the central axis A.
There is provided an oil supply hole 14 penetrating the wall of the inner ring 6 in a direction 180 ° out of phase with respect to the ring groove 12 and communicating with the annular groove 12 and the inside of the bearing 5. Similarly to this, the annular groove 13
The lubricating oil passage 11 is provided in a cross section that includes and is perpendicular to the central axis A.
There is provided an oil supply hole 15 penetrating the wall of the inner ring 6 in a direction 180 ° out of phase with respect to the annular groove 13 and communicating with the inside of the bearing 5.
【００１１】回転軸１が回転している時に、前記潤滑油
パイプ４を通じて潤滑油が中空部２に供給されると、遠
心力によって潤滑油は中空部２の内壁に付着し、ここに
開口している潤滑油通路１０，１１に入り込み、回転軸
１の外周面の環状溝１２，１３内に排出される。そし
て、この溝１２，１３に沿って２方向に別れて軸受の内
輪６の外周をそれぞれ半周し、内輪６を貫通する給油孔
１４，１５に到達する。この環状溝１２，１３に沿う潤
滑油の流れによって内輪６はその全周面を均一に冷却さ
れる。When the lubricating oil is supplied to the hollow portion 2 through the lubricating oil pipe 4 while the rotating shaft 1 is rotating, the lubricating oil adheres to the inner wall of the hollow portion 2 by the centrifugal force and opens there. The lubricant oil passages 10 and 11 are discharged into the annular grooves 12 and 13 on the outer peripheral surface of the rotary shaft 1. Then, the outer circumference of the inner ring 6 of the bearing is divided into two parts along the grooves 12 and 13 to reach the oil supply holes 14 and 15 penetrating the inner ring 6, respectively. The inner circumferential surface of the inner ring 6 is uniformly cooled by the flow of the lubricating oil along the annular grooves 12 and 13.
【００１２】給油孔１４，１５に達した潤滑油は遠心力
によって軸受内部に噴射され、鋼球とレースとの間の潤
滑を行い、その後、外部に流出して回収され、再び前記
の供給サイクルに復帰する。前述の例では、環状溝１
２，１３を回転軸１の外周面に設けたが、代わりに回転
軸の外周面に接触している軸受の内輪６の外周面に設け
ても同様の効果が得られる。The lubricating oil reaching the oil supply holes 14 and 15 is injected into the inside of the bearing by centrifugal force to lubricate between the steel ball and the race, and then flows out to the outside to be recovered, and again the above-mentioned supplying cycle. Return to. In the above example, the annular groove 1
Although 2 and 13 are provided on the outer peripheral surface of the rotating shaft 1, the same effect can be obtained by providing them on the outer peripheral surface of the inner ring 6 of the bearing which is in contact with the outer peripheral surface of the rotating shaft.
【００１３】又、この例では潤滑油通路１０と給油孔１
４の対，及び潤滑油通路１１と給油孔１５との対をそれ
ぞれ同一横断面内で１８０°位相の異なった方向に設置
したが、代わりに同一断面内に複数対の潤滑油通路と給
油孔を等分角位置に位相をずらして設けるようにしても
よい。Further, in this example, the lubricating oil passage 10 and the oil supply hole 1 are provided.
No. 4 and the pair of the lubricating oil passage 11 and the oil supply hole 15 are installed in the same cross section in directions different in phase by 180 °, but instead, a plurality of pairs of lubricating oil passages and oil supply holes are provided in the same cross section. May be provided at equiangular positions with a phase shift.
【００１４】[0014]
【発明の効果】本発明によれば、回転軸の中空部とその
外周面とを結ぶ潤滑油通路と軸受内輪の給油孔とを位相
の異なる方向に設け、両者を内輪の外周に沿う環状溝を
介して連通させたので、この環状溝を通過する潤滑油の
冷却効果によって、内輪の均一な冷却が可能となる。こ
れにより、従来のアンダーレース潤滑構造の場合に生じ
易かった内輪の不均一冷却が解消し、少量の給油量で軸
受の寿命を長くすると共に、騒音の少ない運転が可能に
なる。According to the present invention, the lubricating oil passage connecting the hollow portion of the rotary shaft and the outer peripheral surface thereof and the oil supply hole of the inner ring of the bearing are provided in the directions different in phase, and both are formed in the annular groove along the outer periphery of the inner ring. Since it is communicated with the inner ring, the cooling effect of the lubricating oil passing through the annular groove enables uniform cooling of the inner ring. As a result, the uneven cooling of the inner ring, which is likely to occur in the case of the conventional underrace lubrication structure, is eliminated, the life of the bearing is extended with a small amount of oil supply, and operation with less noise becomes possible.
【図１】本発明の軸受潤滑構造の構成を示す軸方向断面
図である。FIG. 1 is an axial sectional view showing a structure of a bearing lubrication structure of the present invention.
【図２】図１のＸ−Ｘ線に沿う横断面図である。FIG. 2 is a cross-sectional view taken along line XX of FIG.
１…回転軸 ２…中空部 ３…固定部材 ４…潤滑油パイプ ５…軸受 ６…内輪 ７…外輪 ８…リテーナ ９…鋼球 １０，１１…潤滑油通路 １２，１３…環状溝 １４，１５…給油孔 DESCRIPTION OF SYMBOLS 1 ... Rotating shaft 2 ... Hollow part 3 ... Fixing member 4 ... Lubricating oil pipe 5 ... Bearing 6 ... Inner ring 7 ... Outer ring 8 ... Retainer 9 ... Steel balls 10, 11 ... Lubricating oil passages 12, 13 ... Annular groove 14, 15 ... Oil filling hole
Claims (1)
定された内輪と、転動体を介して該内輪に対して相対回
転可能に取付けられた外輪とからなる軸受に対して、前
記回転軸の中空部から潤滑油の供給を行うアンダーレー
ス方式の軸受の潤滑構造であって、前記回転軸の中空部
から前記回転軸の外周に達する少なくとも１本の半径方
向の潤滑油通路を設け、前記回転軸の外周面又は／及び
これと接する内輪の内周面に前記潤滑油通路に連通する
円周方向の溝を設け、更に、前記潤滑油通路を含んで前
記軸心に垂直な断面において、前記内輪の壁を半径方向
に貫通して前記溝から軸受の内部に達し、前記潤滑油通
路とは軸心に対する位相角度の異なる給油孔を設けたこ
とを特徴とする軸受の潤滑構造。1. A bearing comprising an inner ring fixed to the outer periphery of a rotary shaft having a hollow portion at its shaft center, and an outer ring mounted so as to be rotatable relative to the inner ring via a rolling element, A lubrication structure for an underlace type bearing that supplies lubricating oil from a hollow portion of a rotating shaft, wherein at least one radial lubricating oil passage extending from the hollow portion of the rotating shaft to the outer periphery of the rotating shaft is provided. A circumferential groove that communicates with the lubricating oil passage is formed on the outer peripheral surface of the rotating shaft or / and the inner peripheral surface of the inner ring that is in contact with the outer peripheral surface, and further includes a cross section that includes the lubricating oil passage and is perpendicular to the axial center. In the lubrication structure of the bearing, a lubricating hole is provided, which penetrates the wall of the inner ring in the radial direction to reach the inside of the bearing from the groove and has a phase angle different from the lubricating oil passage with respect to the shaft center.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404935A JP2541700B2 (en) | 1990-12-21 | 1990-12-21 | Lubrication structure of bearing |
| EP91304261A EP0458499B1 (en) | 1990-05-21 | 1991-05-13 | Apparatus for cooling a spindle bearing of a machine |
| DE69126917T DE69126917T2 (en) | 1990-05-21 | 1991-05-13 | Cooling device of a machine spindle bearing |
| US07/701,179 US5192139A (en) | 1990-05-21 | 1991-05-16 | Apparatus for cooling a spindle bearing of a machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404935A JP2541700B2 (en) | 1990-12-21 | 1990-12-21 | Lubrication structure of bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07145819A true JPH07145819A (en) | 1995-06-06 |
| JP2541700B2 JP2541700B2 (en) | 1996-10-09 |
Family
ID=18514577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2404935A Expired - Lifetime JP2541700B2 (en) | 1990-05-21 | 1990-12-21 | Lubrication structure of bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2541700B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008223915A (en) * | 2007-03-13 | 2008-09-25 | Yamaha Motor Co Ltd | Bearing device and engine equipped with the same |
| US7819587B2 (en) | 2004-10-19 | 2010-10-26 | Ntn Corporation | Lubricating device for rolling bearing |
| CN107953261A (en) * | 2017-12-26 | 2018-04-24 | 华辰精密装备（昆山）股份有限公司 | High-speed grinding roll grinder main shaft temperature control system |
| CN110219973A (en) * | 2019-06-04 | 2019-09-10 | 广东技术师范大学 | A kind of gear transmission structure |
| KR20200073146A (en) * | 2018-12-13 | 2020-06-23 | 에바라코포레이숀 | Substrate cleaning apparatus |
| CN113595310A (en) * | 2021-08-04 | 2021-11-02 | 珠海格力电器股份有限公司 | Rotor subassembly and have its motor |
| KR20210142194A (en) * | 2020-03-02 | 2021-11-24 | 가부시키가이샤 캡 | blower |
| CN115091260A (en) * | 2022-06-09 | 2022-09-23 | 南通中南智能科技有限公司 | Efficient continuous cooling main shaft system of machining center |
| US12038018B2 (en) | 2020-03-02 | 2024-07-16 | Cap Co., Ltd. | Blower |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102423863B (en) * | 2011-12-27 | 2013-07-17 | 重庆机床(集团)有限责任公司 | Heat balance system of machine tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734346U (en) * | 1980-07-31 | 1982-02-23 | ||
| JPS612351U (en) * | 1984-06-13 | 1986-01-09 | 石川島播磨重工業株式会社 | web winding device |
-
1990
- 1990-12-21 JP JP2404935A patent/JP2541700B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734346U (en) * | 1980-07-31 | 1982-02-23 | ||
| JPS612351U (en) * | 1984-06-13 | 1986-01-09 | 石川島播磨重工業株式会社 | web winding device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7819587B2 (en) | 2004-10-19 | 2010-10-26 | Ntn Corporation | Lubricating device for rolling bearing |
| JP2008223915A (en) * | 2007-03-13 | 2008-09-25 | Yamaha Motor Co Ltd | Bearing device and engine equipped with the same |
| CN107953261A (en) * | 2017-12-26 | 2018-04-24 | 华辰精密装备（昆山）股份有限公司 | High-speed grinding roll grinder main shaft temperature control system |
| KR20200073146A (en) * | 2018-12-13 | 2020-06-23 | 에바라코포레이숀 | Substrate cleaning apparatus |
| CN110219973A (en) * | 2019-06-04 | 2019-09-10 | 广东技术师范大学 | A kind of gear transmission structure |
| CN110219973B (en) * | 2019-06-04 | 2024-04-02 | 广东技术师范大学 | Gear transmission structure |
| KR20210142194A (en) * | 2020-03-02 | 2021-11-24 | 가부시키가이샤 캡 | blower |
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| CN115091260A (en) * | 2022-06-09 | 2022-09-23 | 南通中南智能科技有限公司 | Efficient continuous cooling main shaft system of machining center |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2541700B2 (en) | 1996-10-09 |
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