JP4003343B2 - Bearing cooling device - Google Patents
Bearing cooling device Download PDFInfo
- Publication number
- JP4003343B2 JP4003343B2 JP09979499A JP9979499A JP4003343B2 JP 4003343 B2 JP4003343 B2 JP 4003343B2 JP 09979499 A JP09979499 A JP 09979499A JP 9979499 A JP9979499 A JP 9979499A JP 4003343 B2 JP4003343 B2 JP 4003343B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- cooling
- inner ring
- rotating shaft
- rolling
- 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.)
- Expired - Fee Related
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
- F16C37/007—Cooling of bearings of rolling bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
- F16C19/542—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Description
【0001】
【発明の属する技術分野】
この発明は、軸受冷却装置、さらに詳しくは、強制潤滑法として知られるオイルミスト潤滑、オイルエア潤滑、マイクロフォグ潤滑等で潤滑される転動体を有するころがり軸受の主として内輪と、さらにこれが嵌装する回転軸を冷却する装置に関するものである。
【0002】
【従来の技術】
前記ころがり軸受の高速かつ長時間回転を維持するために、前記強制潤滑によって常時潤滑油を軸受内部に供給して転動体及び内外輪の焼き付きを防止することが行われているが、軸受の発熱、即ち軸受の内輪と外輪の両方の転動面における発熱を抑えることも重要な事柄である。
【0003】
このうち、外輪の発熱は該外輪の熱膨張を招いて軸受の予圧が低下するが、締め付け方向でないから焼き付きは発生しない。しかし、外輪の熱変位乃至熱変形を起生するため、軸受外輪の周囲にジャケットを構成してここに冷却油を流通させて外輪の前記熱変位等を抑えることが行われているが、過度に冷却して締め付けによる焼き付きを生じさせることもあった。
【0004】
一方内輪については、その発熱を抑制できれば熱変位の少ない高精度な軸受及び回転軸が得られるにもかかわらず、従来積極的な対策はとられていない。最近になって、アンダーレース潤滑が採用され始めたが、構造が複雑でコストが高く、簡単には採用できない。
【0005】
特開昭59−122758号公報には、ブラケットに支持されて回転軸を支持するころがり軸受の内輪の側面に、該側面に全面接触して受熱しつつ回転軸に嵌合するボス部を設けるとともに、該ボス部を前記ブラケットの外部まで突出するよう延長せしめ、その延長端部に冷却フィンを放射状に形成した円盤状の放熱フィンを設けてこれを通風穴をあけた保護カバーで覆った軸受装置が開示されている。
【0006】
しかしながら、上記特開昭のものでは、放熱フィンのブラケットはわずかに内輪の側面に接するのみなので軸受内輪の放熱効率が悪いばかりでなく、前記冷却フィンによる冷風は保護カバー内を通過するのみで、軸受自体を冷却できないという問題がある。
【0007】
本発明者は、上記に鑑みかつ前記オイルミスト潤滑、オイルエア潤滑等ではもともとエアを使用していることに着目し、エアによる冷却機能を追加しても問題は生じないことを確認した上、主として前記内輪、さらにはこれが嵌装する回転軸を比較的簡単な構造で効率良く冷却する手段を案出したものである。
【0008】
【発明が解決しようとする課題】
本発明の課題は、転動体を有するころがり軸受が高速かつ長時間回転を維持することができるよう、主として軸受内輪、更にはこれが嵌装する回転軸を、比較的簡単な構造で効率良く冷却する軸受冷却装置を得ることである。
【0009】
【問題を解決するための手段】
前記課題を解決するための本発明軸受冷却装置は、内、外輪間に複列の転動体を有する転がり軸受の全周にわたり、軸受内部に冷却空気を導入する冷却エア供給穴を外輪に形成するとともに、複列の転動体間において前記軸受が嵌装する回転軸とともに回転する内輪間座にフィンによる空気流発生部を設け、前記フィンはその 高さを前記エア供給穴に面した部分を低く、前記転動体側が高くなるよう形成したことを特徴とする。
【0010】
【発明の実施の形態】
本発明の実施の形態を実施例に基づき図面を参照して詳細に説明する。図1乃至図4に示すものは、転動体(球)1、1’を複列有するころがり軸受で、転動体1、1’を外輪2、2’と内輪3、3’との間に配設するとともに、転動体1、1’の各列の中間に、外輪間座4と内輪間座5が設けられ、外輪2、2’、内輪3、3’を各々一体化している。
【0011】
前記外輪間座4は少なくともその外径を外輪2、2’と同一とし、また内輪間座5は少なくともその内径を内輪3、3’と同一とするが、前記外輪間座4には図2、図4に示すように、軸受内部に冷却空気を導入する冷却エア供給穴6を、全周に例えば30度ごとに1個づつ形成してエアノズル(図示せず)を設けるとともに、前記内輪間座5にはその外周に図2、図3及び図4に示すように、空気流発生部としてのフィン7を形成している。なお、9は潤滑油ノズルを示し、通常周囲に1、2個設けられる。
【0012】
前記フィン7は、各々円盤状をなしているが、図2及び図4に示すように前記冷却エア供給穴6に面した部分、即ち内輪間座5における奥行き方向の中央の部分を低く、かつそこから左右の転動体1、1’に向かって順次高くしている。これによって、前記冷却エア供給穴6から供給された冷風または室温風を、フィン7の高さの差により生ずる回転風速の差で図4の矢印のように、強制的に転動体1、1’側へ流し、内輪3、3’のみならず外輪2、2’、回転軸を強制的に冷却することができる。
【0013】
【発明の効果】
本発明軸受冷却装置では、内、外輪間に複列の転動体を有する転がり軸受の全周にわたり、軸受内部に冷却空気を導入する冷却エア供給穴を外輪に形成するとともに、複列の転動体間において前記軸受が嵌装する回転軸とともに回転する内輪間座にフィンによる空気流発生部を設け、前記フィンはその高さを前記エア供給穴に面した部分を低く、前記転動体側が高くなるよう形成したことを特徴とするので、軸受内、外輪、さらにはこれらが嵌装する回転軸を、比較的簡単な構造で効率良く冷却することができる軸受冷却装置を得ることができる。
【0014】
回転軸を冷却する場合、該軸の中心にあけた穴に潤滑油を通すことも考えられるが、概して熱交換効率が悪く、また回転軸からの軸受の冷却を期待しても、回転軸の肉厚のため軸受温度に現れない程度のわずかなものに過ぎない。しかし本発明のように間座または軸受と一体的な回転部材を冷却することにより、軸受の内、外輪及びこれらが嵌装する回転軸が同時に効果的に強制冷却され、軸受を高精度に保ちつつ高速、長時間連続の回転を可能とする効果がある。
【図面の簡単な説明】
【図1】本発明軸受冷却装置を備えた軸受の一例を示す正面図である。
【図2】図1のA−A断面矢視図である。
【図3】内輪の間座の一例を示す断面図である。
【図4】図2の拡大図で、作用の説明図である。
1、1’ 転動体
2、2’ 外輪
3、3’ 内輪
4 外輪間座
5 内輪間座
6 冷却エア供給穴
7 フィン
8 潤滑油ノズル
S 回転軸。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing cooling device, more specifically, an inner ring of a rolling bearing having rolling elements lubricated by oil mist lubrication, oil air lubrication, micro fog lubrication or the like known as a forced lubrication method, and a rotation in which it is fitted . The present invention relates to a device for cooling a shaft.
[0002]
[Prior art]
In order to maintain high-speed and long-time rotation of the rolling bearing, the lubricating oil is constantly supplied into the bearing by the forced lubrication to prevent seizure of the rolling elements and the inner and outer rings. That is, it is also important to suppress heat generation on the rolling surfaces of both the inner ring and the outer ring of the bearing.
[0003]
Of these, heat generation of the outer ring causes thermal expansion of the outer ring and reduces the preload of the bearing, but seizure does not occur because it is not in the tightening direction. However, in order to cause thermal displacement or thermal deformation of the outer ring, a jacket is formed around the bearing outer ring, and cooling oil is circulated through the jacket to suppress the thermal displacement of the outer ring. In some cases, it was cooled to cause seizure due to tightening.
[0004]
On the other hand, regarding the inner ring, no positive measures have been taken in the past, although high-accuracy bearings and rotating shafts with little thermal displacement can be obtained if the heat generation can be suppressed. Recently, underlace lubrication has begun to be adopted, but the structure is complicated and expensive, and cannot be easily adopted.
[0005]
Japanese Patent Application Laid-Open No. 59-122758 provides a boss portion that is supported by a bracket and supports a rotating shaft on the side surface of the inner ring of the rolling bearing that is in contact with the side surface and receives heat while fitting to the rotating shaft. A bearing device in which the boss portion is extended so as to protrude to the outside of the bracket, and a disk-shaped heat radiation fin in which cooling fins are radially formed is provided at an extended end portion thereof and covered with a protective cover having a ventilation hole. Is disclosed.
[0006]
However, in the above-mentioned JP-A Sho, the heat dissipation fin bracket slightly touches the side surface of the inner ring, so the heat dissipation efficiency of the bearing inner ring is not only bad, but the cold air generated by the cooling fins only passes through the protective cover. There is a problem that the bearing itself cannot be cooled.
[0007]
In view of the above, the present inventor has paid attention to the fact that air is originally used in the oil mist lubrication, oil air lubrication, etc., and has confirmed that there is no problem even if an air cooling function is added. A means for efficiently cooling the inner ring, and further the rotating shaft into which it is fitted, has been devised with a relatively simple structure.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to efficiently cool mainly a bearing inner ring and further a rotating shaft on which it is fitted so that a rolling bearing having rolling elements can be rotated at a high speed for a long time with a relatively simple structure. It is to obtain a bearing cooling device.
[0009]
[Means for solving problems]
The bearing cooling device of the present invention for solving the above-mentioned problems forms a cooling air supply hole in the outer ring for introducing cooling air into the bearing over the entire circumference of the rolling bearing having a double row rolling element between the inner and outer rings. In addition, an air flow generating portion is provided by a fin in the inner ring spacer that rotates together with the rotating shaft on which the bearing is fitted between the double row rolling elements, and the height of the fin facing the air supply hole is lowered. The rolling element side is formed to be higher .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail based on examples with reference to the drawings. 1 to 4 show rolling bearings having double rows of rolling elements (balls) 1 and 1 ', and the
[0011]
The outer ring spacer 4 has at least the same outer diameter as that of the
[0012]
Each of the
[0013]
【The invention's effect】
In the bearing cooling device of the present invention, a cooling air supply hole for introducing cooling air into the bearing is formed in the outer ring over the entire circumference of the rolling bearing having the double row rolling elements between the inner and outer rings , and the double row rolling elements An air flow generating portion is provided by a fin in an inner ring spacer that rotates together with a rotating shaft on which the bearing is fitted, and the fin has a lower portion facing the air supply hole and a higher height on the rolling element side. Thus, a bearing cooling device capable of efficiently cooling the inner and outer rings of the bearing and the rotating shaft into which they are fitted with a relatively simple structure can be obtained.
[0014]
When cooling the rotating shaft, lubricating oil may be passed through a hole in the center of the shaft, but generally the heat exchange efficiency is poor, and even if cooling of the bearing from the rotating shaft is expected, the rotating shaft Due to the wall thickness, it is only a small amount that does not appear in the bearing temperature. However, by cooling the spacer or the rotating member integral with the bearing as in the present invention, the inner and outer rings of the bearing and the rotating shaft on which they are fitted are simultaneously and effectively cooled, thereby maintaining the bearing with high accuracy. However, there is an effect of enabling high-speed and continuous rotation for a long time.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a bearing provided with a bearing cooling device of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a cross-sectional view showing an example of an inner ring spacer.
FIG. 4 is an enlarged view of FIG.
DESCRIPTION OF
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09979499A JP4003343B2 (en) | 1999-04-07 | 1999-04-07 | Bearing cooling device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09979499A JP4003343B2 (en) | 1999-04-07 | 1999-04-07 | Bearing cooling device |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000291674A JP2000291674A (en) | 2000-10-20 |
JP4003343B2 true JP4003343B2 (en) | 2007-11-07 |
Family
ID=14256834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP09979499A Expired - Fee Related JP4003343B2 (en) | 1999-04-07 | 1999-04-07 | Bearing cooling device |
Country Status (1)
Country | Link |
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JP (1) | JP4003343B2 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1352117A2 (en) * | 2000-08-10 | 2003-10-15 | Barmag AG | Galette unit |
BE1015913A3 (en) * | 2004-02-23 | 2005-11-08 | Atlas Copco Airpower Nv | Machine with improved bearing lubrication. |
US8316776B2 (en) * | 2007-03-30 | 2012-11-27 | Thk Co., Ltd. | Rotary bearing, rotary table device and table diameter determining method |
CN102748399B (en) * | 2012-07-31 | 2014-04-09 | 无锡市第二轴承有限公司 | Fast self-cooling bearing space ring |
JP6050072B2 (en) * | 2012-09-24 | 2016-12-21 | Ntn株式会社 | Cooling structure of bearing device |
US9541137B2 (en) | 2012-09-24 | 2017-01-10 | Ntn Corporation | Cooling structure for bearing device |
JP6144024B2 (en) * | 2012-09-24 | 2017-06-07 | Ntn株式会社 | Cooling structure of bearing device |
JP2015117820A (en) * | 2013-11-18 | 2015-06-25 | Ntn株式会社 | Cooling structure of bearing device |
JP6385090B2 (en) * | 2014-03-22 | 2018-09-05 | Ntn株式会社 | Cooling structure of bearing device |
EP3124812B1 (en) | 2014-03-22 | 2019-02-20 | NTN Corporation | Cooling structure for bearing device |
JP6385089B2 (en) * | 2014-03-22 | 2018-09-05 | Ntn株式会社 | Cooling structure of bearing device |
JP6339433B2 (en) * | 2014-07-22 | 2018-06-06 | Ntn株式会社 | Ball bearing for spindle with built-in motor |
JP6619254B2 (en) * | 2016-02-12 | 2019-12-11 | 株式会社ササクラ | Bearing cooling structure |
JP7011439B2 (en) * | 2017-03-29 | 2022-01-26 | Ntn株式会社 | Bearing device cooling structure |
JP6983029B2 (en) * | 2017-10-11 | 2021-12-17 | Ntn株式会社 | Bearing device cooling structure |
WO2018181033A1 (en) * | 2017-03-29 | 2018-10-04 | Ntn株式会社 | Cooling structure for bearing device |
JP6609003B2 (en) * | 2018-06-20 | 2019-11-20 | Ntn株式会社 | Cooling structure of bearing device |
-
1999
- 1999-04-07 JP JP09979499A patent/JP4003343B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP2000291674A (en) | 2000-10-20 |
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