JPH0730788B2 - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JPH0730788B2 JPH0730788B2 JP60162147A JP16214785A JPH0730788B2 JP H0730788 B2 JPH0730788 B2 JP H0730788B2 JP 60162147 A JP60162147 A JP 60162147A JP 16214785 A JP16214785 A JP 16214785A JP H0730788 B2 JPH0730788 B2 JP H0730788B2
- Authority
- JP
- Japan
- Prior art keywords
- inner ring
- bearing
- outer ring
- linear expansion
- expansion coefficient
- 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
Landscapes
- Rolling Contact Bearings (AREA)
- Support Of The Bearing (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、玉軸受、ころ軸受などの転がり軸受の使用
中における温度上昇に伴う熱膨張の大きい箇所に使用さ
れる転がり軸受に関し、例えば、高速回転で使用される
工作機械用の回転部の支持軸受として有効な転がり軸受
を提供するものである。Description: TECHNICAL FIELD The present invention relates to a rolling bearing such as a ball bearing or a roller bearing, which is used in a place where thermal expansion is large due to a temperature rise during use of the rolling bearing. It is intended to provide a rolling bearing effective as a support bearing for a rotating part of a machine tool used at high speed rotation.
［従来技術］ 一般に最近の工作機械は、ますます高速回転化する傾向
にあり、該工作機械の回転部を支持する転がり軸受にも
高精度で、かつ、苛酷な使用条件が強いられてきてい
る。軸受の回転速度が早くなるにつれて、軸受の内部す
きまとの関連における転がり摩擦による発熱が急増し、
軸受の温度も高くなる。[Prior Art] Generally, recent machine tools tend to rotate at higher speeds, and rolling bearings that support the rotating parts of the machine tools are also required to have high accuracy and severe usage conditions. . As the rotation speed of the bearing increases, the heat generated by rolling friction in relation to the internal clearance of the bearing increases sharply,
The bearing temperature will also increase.
通常の軸受支持構造にあっては、前記発熱に伴う外輪の
熱は、ハウジングを通り比較的放熱しやすいが、内輪の
熱は、軸体側から放熱されにくいため、外輪に比べ内輪
の温度が高くなる。In a normal bearing support structure, the heat of the outer ring due to the heat generation is relatively easy to radiate through the housing, but the heat of the inner ring is less likely to be radiated from the shaft side, so the temperature of the inner ring is higher than that of the outer ring. Become.
ところが、従来の転がり軸受は、ほとんどの場合、外輪
と内輪とが同一の材料、すなわち、通常軸受鋼と呼ばれ
ている高炭素クロム軸受鋼鋼材で作られているために、
前述のような軸受発熱によって、外輪と内輪との間に温
度差が生じ、軸受の内部すきまは、発熱しない前と比べ
小さくなる。（減少する。） このため、特に使用条件のきびしい高速回転下にあって
は、設定条件に対し、前記軸受のラジアルすきまが過少
となったり、すきま変化に伴う結果として生ずる予圧が
過大となったり、それが更に発熱を助長するという悪循
環をもたらし、ついには、軸受の焼付きという損傷に至
ることが多い。However, in most conventional rolling bearings, the outer ring and the inner ring are made of the same material, that is, high carbon chromium bearing steel, which is usually called bearing steel.
Due to the bearing heat generation as described above, a temperature difference occurs between the outer ring and the inner ring, and the internal clearance of the bearing becomes smaller than that before the heat generation. For this reason, the radial clearance of the bearing becomes too small or the preload resulting from the clearance change becomes too large under the set conditions, especially under high speed rotation under severe operating conditions. However, it causes a vicious circle that further promotes heat generation, which eventually leads to seizure of the bearing and damage.
通常使用回転速度が一定の場合には、その特定の使用条
件下において最適なすきま、あるいは最適な予圧となる
ようにあらかじめ補正した軸受を選定して組付ければ良
いが、その補正にむずかしさがあり、また回転条件が種
々と変化する場合には、回転装置に組込まれた軸受の温
度を検出し、軸受の隙間（または隙間の変化に伴う結果
として生ずる予圧）を外部的な力（例えば油圧機構な
ど）によって調整することもなされているが、装置が複
雑で、かつ、高価となるなどの欠点があった。If the normal operating speed is constant, it is sufficient to select and assemble a bearing that has been pre-corrected so that the optimum clearance or optimum preload is obtained under the specific operating conditions.However, the correction is difficult. If there are various changes in the rotation conditions, the temperature of the bearing incorporated in the rotating device is detected, and the bearing gap (or the preload resulting from the change in the gap) is applied to an external force (for example, hydraulic pressure). However, there is a drawback that the device is complicated and expensive.
［発明が解決しようとする問題点］ この発明は、上記従来の問題点を解決することを目的と
し、具体的には、軸受の温度上昇に伴う外内輪間の温度
差による軸受の内部すきまやすきまの変化に伴う結果と
して生ずる予圧の変化を簡単な手段によってより小さく
押え、焼付き損傷の防止と同時に軸体とそれに嵌合され
る内輪とのクリープの防止をすることにある。[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned conventional problems. Specifically, the internal clearance of the bearing due to the temperature difference between the outer and inner rings due to the temperature rise of the bearing, The purpose of the present invention is to suppress the change in preload resulting from the change in clearance to a smaller extent by simple means, prevent seizure damage, and at the same time prevent creep between the shaft body and the inner ring fitted thereto.
［問題を解決するための手段］ この発明は、軸体に嵌合される内輪とハウジングに保持
される外輪との間に転動体を備えた転がり軸受におい
て、前記内輪の材料を外輪の材料よりも線膨張係数の小
さい材質で形成し、内輪の材料の線膨張係数が、内輪の
嵌合される鋼製の軸体の材料の線膨張係数よりも小さく
形成されたことにある。[Means for Solving the Problem] In the present invention, in a rolling bearing including a rolling element between an inner ring fitted to a shaft body and an outer ring held in a housing, the material of the inner ring is more than the material of the outer ring. Is also formed of a material having a small linear expansion coefficient, and the linear expansion coefficient of the material of the inner ring is smaller than the linear expansion coefficient of the material of the steel shaft body to which the inner ring is fitted.
［作 用］ かくして、この発明にあっては、軸受の発熱によって外
輪と内輪との間に温度差が生じ、内輪の温度が外輪の温
度よりも高くなっても、この温度差に対する内輪の膨張
が小さく押えられ、その結果、軸受の内部すきまやすき
まの変化に伴う結果として生ずる予圧の変化が小さくか
つ、鋼製の軸体と内輪の線膨張係数差によりはめあいし
ろの減少がなく、クリープの防止ができる。[Operation] According to the present invention, therefore, even if the temperature of the inner ring becomes higher than the temperature of the outer ring due to the temperature difference between the outer ring and the inner ring due to the heat generation of the bearing, the expansion of the inner ring against the temperature difference occurs. Is small, and as a result, the change in preload resulting from changes in the internal clearance and clearance of the bearing is small, and there is no decrease in the fit margin due to the difference in the linear expansion coefficient between the steel shaft and the inner ring. Can be prevented.
［実施例］ 次にこの発明を図に示すアンギュラ形玉軸受について説
明すると、１は外輪、２は内輪、３は転動体である玉、
４は保持器、５は軸体、６はハウジングである。[Embodiment] Next, the present invention will be described with reference to an angular ball bearing shown in the drawings. 1 is an outer ring, 2 is an inner ring, 3 is a ball which is a rolling element,
Reference numeral 4 is a retainer, 5 is a shaft, and 6 is a housing.
外輪１および玉３は、高炭素クロム軸受鋼鋼材（軸受
鋼）第２種（SUJ2）から形成されており、また内輪２
は、前記軸受鋼（線膨張係数12.5×10-6/℃）よりも線
膨張係数の小さい材料の１つとしてのマルテンサイト系
ステンレス鋼（SUS440C、線膨張係数10×10-6/℃）によ
って形成されている。The outer ring 1 and the balls 3 are made of a high carbon chromium bearing steel material (bearing steel) type 2 (SUJ2), and the inner ring 2
Is a martensitic stainless steel (SUS440C, linear expansion coefficient 10 × 10 -6 / ° C), which is one of the materials with a linear expansion coefficient smaller than that of the bearing steel (linear expansion coefficient 12.5 × 10 -6 / ° C). Has been formed.
ちなみに実験のための前段として、従来の如く、内輪、
外輪および玉を軸受鋼（SUJ2）とした場合と、内輪を前
述のマルテンサイト系ステンレス鋼（SUS440C）とした
例およびこれ等と他の材料との組合わせによる軸受を設
定し、これを、軸受名番7013C（アンギュラ形玉軸受
で、外径:100mm、内径:65mm、幅:18mm、接触角:15゜）
の軸受に適用し、これを２個背面組合わせとして組付
け、かつ、外輪と内輪との間に温度差のない場合の予圧
を50kgfと想定し、温度差による軸受のラジアルすきま
と予圧の変化を算出すると下記の表のようになる。By the way, as the former stage for the experiment, as in the past, the inner ring,
We set bearings made of bearing steel (SUJ2) for the outer ring and balls, and examples of martensitic stainless steel (SUS440C) for the inner ring and combinations of these with other materials. Name 7013C (Angular ball bearing, outer diameter: 100 mm, inner diameter: 65 mm, width: 18 mm, contact angle: 15 °)
It is applied to the bearings of No.2, and the two are assembled as a back combination, and assuming that the preload is 50 kgf when there is no temperature difference between the outer ring and the inner ring, the radial clearance and preload of the bearing change due to the temperature difference. When is calculated, it becomes as shown in the table below.
上記６つの例から見て理解できるように、従来の如く、
外輪、内輪および玉を同一材料、すなわち、軸受鋼にて
形成した例Ｉ−の場合は、外輪と内輪との温度差が僅
か４℃に対し予圧が約2.2倍にも増加するのに対し、
の内輪をマルテンサイト系ステンレス鋼とした場合には
ほとんど変化が見られず、また例IIの温度差７℃の場合
にあっても、この発明のものは、予圧の増加がほとんど
見られないものと、逆に大きく低下するものとが見られ
る。 As can be seen from the above six examples, as in the past,
In the case of the example I- in which the outer ring, the inner ring and the balls are made of the same material, that is, the bearing steel, the preload increases about 2.2 times for the temperature difference between the outer ring and the inner ring of only 4 ° C.
Almost no change was observed when the inner ring was made of martensitic stainless steel, and even when the temperature difference of Example II was 7 ° C., the present invention showed almost no increase in preload. On the contrary, it can be seen that it drops significantly.
以上述べたようにこの発明にあっては、鋼製の軸体に嵌
合される内輪とハウジングに保持される外輪との間に転
動体を有する転がり軸受において、前記軸受の内輪の材
料が外輪の材料よりも線膨張係数の小さい材質で形成さ
れ、内輪の材料の線膨張係数が、内輪の嵌合される鋼製
の軸体の材料の線膨張係数よりも小さく形成されている
ので、軸受の使用中、軸受の温度上昇により内輪の温度
が、外輪の温度よりも高くなり、内輪と外輪との間に温
度差による内部すきまの変化が生じても予圧の変化はほ
とんどなく、あるいは逆に減少する。As described above, in the present invention, in the rolling bearing having the rolling element between the inner ring fitted to the steel shaft body and the outer ring held by the housing, the material of the inner ring of the bearing is the outer ring. Since the linear expansion coefficient of the material of the inner ring is smaller than the linear expansion coefficient of the material of the steel shaft body to which the inner ring is fitted, During use, the temperature of the inner ring becomes higher than the temperature of the outer ring due to the temperature rise of the bearing, and even if the internal clearance changes due to the temperature difference between the inner ring and the outer ring, there is little or no change in the preload. Decrease.
従って、軸受の温度上昇に伴う軸受の焼付きによる損傷
が効果的に防止され、工作機械のような高速で、かつ、
高精度の要求される軸受としてきわめて有効である。Therefore, the damage due to seizure of the bearing due to the temperature rise of the bearing can be effectively prevented, and at a high speed like a machine tool, and
It is extremely effective as a bearing that requires high precision.
また前述の内輪の材料を単に外輪の材料の材質よりも線
膨張係数の小さい材料とするだけでなく、同時に内輪の
線膨張係数が、内輪の嵌合される鋼製の軸体の材料の線
膨張係数よりも小さく形成されているので、熱膨張によ
る内輪と軸体との間のはめあいしろの減少が押えられ、
内輪のクリープ防止ができ、軸受の耐焼付性と耐クリー
プ性を同時に向上でききわめて有効である。Further, the material of the inner ring is not only a material having a smaller linear expansion coefficient than that of the material of the outer ring, but at the same time, the linear expansion coefficient of the inner ring is the same as that of the material of the steel shaft body to which the inner ring is fitted. Since it is formed smaller than the expansion coefficient, the reduction of the fit between the inner ring and the shaft due to thermal expansion is suppressed,
This is extremely effective because it can prevent the inner ring from creeping and improve the seizure resistance and creep resistance of the bearing at the same time.
なお実施例では、内輪の材料として、マルテンサイト系
ステンレス鋼、アルミナ系セラミック、炭化珪素系セラ
ミックなどの例を示したが、これ等の材料に限定される
ものではなく、特許請求の範囲内で実施するものであ
る。In the examples, as the material of the inner ring, examples of martensitic stainless steel, alumina ceramics, silicon carbide ceramics, etc. are shown, but the materials are not limited to these materials, and within the scope of the claims. It is to be implemented.
また実施例では、内輪材料として線膨張係数が軸受鋼よ
りも小さい材質のものを使用した例について説明した
が、外輪にオーステナイト系ステンレス鋼（SUS304、線
膨張係数17×10-6/℃）ように線膨張係数の大きい材質
のものを使用し、内輪を軸受鋼としても、結果的には、
外輪に比べ内輪の線膨張係数の方が小さくなり、前述の
如き効果が得られるが、この場合には、外輪の膨張との
関係からハウジングも外輪と同程度の線膨張係数の材質
の材料とする必要があり、全体的変形が大きくなるとい
う欠点が残る。In addition, in the example, an example in which a material having a linear expansion coefficient smaller than that of the bearing steel is used as the material of the inner ring has been described, but an austenitic stainless steel (SUS304, linear expansion coefficient 17 × 10 −6 / ° C.) may be used for the outer ring. Even if the inner ring is made of bearing steel using a material with a large linear expansion coefficient,
The linear expansion coefficient of the inner ring is smaller than that of the outer ring, and the effects described above are obtained, but in this case, the housing is made of a material having a linear expansion coefficient similar to that of the outer ring due to the expansion of the outer ring. However, there is a drawback that the overall deformation becomes large.
更には、この発明の目的達成の他の手段として、外内輪
の材料の材質に比べ転動体を線膨張係数の小さい材質の
材料としても良いが、効果の点で十分とは云えない。Further, as another means for achieving the object of the present invention, the rolling elements may be made of a material having a smaller linear expansion coefficient than that of the material of the outer and inner rings, but this is not sufficient in terms of effects.
図面はこの発明の実施例を示す要部断面図である。 実施例の符号中、１は外輪、２は内輪、３は玉、４は保
持器、５は軸体、６はハウジングである。The drawings are cross-sectional views of essential parts showing an embodiment of the present invention. In the reference numerals of the embodiments, 1 is an outer ring, 2 is an inner ring, 3 is a ball, 4 is a retainer, 5 is a shaft, and 6 is a housing.
Claims (1)
グに保持される外輪との間に転動体を備えた転がり軸受
において、前記内輪の材料を外輪の材料よりも線膨張係
数の小さい材質で形成し、内輪の材料の線膨張係数が、
内輪の嵌合される鋼製の軸体の材料の線膨張係数よりも
小さく形成されたことを特徴とした転がり軸受。1. A rolling bearing having a rolling element between an inner ring fitted to a steel shaft body and an outer ring held in a housing, wherein the material of the inner ring is made to have a linear expansion coefficient higher than that of the material of the outer ring. The material of the inner ring has a linear expansion coefficient of
A rolling bearing characterized by being formed so as to have a coefficient of linear expansion smaller than that of a material of a steel shaft body into which an inner ring is fitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60162147A JPH0730788B2 (en) | 1985-07-24 | 1985-07-24 | Rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60162147A JPH0730788B2 (en) | 1985-07-24 | 1985-07-24 | Rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6224025A JPS6224025A (en) | 1987-02-02 |
| JPH0730788B2 true JPH0730788B2 (en) | 1995-04-10 |
Family
ID=15748928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60162147A Expired - Fee Related JPH0730788B2 (en) | 1985-07-24 | 1985-07-24 | Rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730788B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236619U (en) * | 1988-08-31 | 1990-03-09 | ||
| JPH0365018U (en) * | 1989-10-30 | 1991-06-25 | ||
| KR100245264B1 (en) * | 1994-06-30 | 2000-03-02 | 김무 | Low noise bearing |
| US6481898B1 (en) | 1998-01-20 | 2002-11-19 | Nsk Ltd. | Ball bearing |
| WO2000037813A1 (en) * | 1998-12-22 | 2000-06-29 | Nsk Ltd. | Ball bearing |
| US6443624B1 (en) * | 2000-08-01 | 2002-09-03 | The Timken Company | High speed angular contact ball bearing |
| US6874942B2 (en) | 2001-03-02 | 2005-04-05 | Nsk Ltd. | Rolling device |
| US6994474B2 (en) * | 2001-05-29 | 2006-02-07 | Nsk Ltd. | Rolling sliding member and rolling apparatus |
| JP2004060797A (en) | 2002-07-30 | 2004-02-26 | Koyo Seiko Co Ltd | Roller member and its manufacturing method |
| AT503000B1 (en) * | 2005-12-21 | 2008-02-15 | Austrian Aerospace Gmbh | WHEEL BEARING WITH TEMPERATURE CONTROLLED PRELOAD ADJUSTMENT FOR SPACE TRAVEL APPLICATIONS |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS607420U (en) * | 1983-06-28 | 1985-01-19 | 日本精工株式会社 | rolling bearing |
| JPS6040822U (en) * | 1983-08-30 | 1985-03-22 | 日本ビクター株式会社 | Ball bearing support device |
-
1985
- 1985-07-24 JP JP60162147A patent/JPH0730788B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6224025A (en) | 1987-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |