JP2949794B2 - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JP2949794B2 JP2949794B2 JP16635590A JP16635590A JP2949794B2 JP 2949794 B2 JP2949794 B2 JP 2949794B2 JP 16635590 A JP16635590 A JP 16635590A JP 16635590 A JP16635590 A JP 16635590A JP 2949794 B2 JP2949794 B2 JP 2949794B2
- Authority
- JP
- Japan
- Prior art keywords
- residual stress
- life
- bearing
- rolling
- compressive residual
- 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 - Lifetime
Links
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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
-
- 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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/32—Balls
-
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、自動車、農業機械、建設機械及び鉄鉱機
械等に使用される転がり軸受に係り、特にトランスミッ
ションやエンジン用として求められる長寿命な転がり軸
受に関する。Description: TECHNICAL FIELD The present invention relates to a rolling bearing used for an automobile, an agricultural machine, a construction machine, an iron ore machine, etc., and particularly to a long-life rolling required for a transmission or an engine. About bearings.
一般にころがり軸受においては、その寿命の低下をも
たらす要因と一つとして、例えば、軸受潤滑油中の異物
混入が挙げられる。周知の如く、例えば、トランスミッ
ション用の潤滑油中には、ギヤ摩耗物のような摩耗粉の
他、金属の切粉、削り屑、バリ等の異物が混入してお
り、このような軸受使用環境下では、これらの異物によ
る軸受の転動体及び軌道輪の表面に損傷が生じることに
なる。この損傷が発生すると、損傷箇所から早期にクラ
ックが発生し、ひいてはフレーキングに到ることがあ
り、軸受寿命が大幅に低下する。異物混入潤滑下の軸受
寿命は異物混入の無いクリーンな潤滑環境の時と比較し
て、約数十分の１まで低下する場合がある。In general, in a rolling bearing, one of the factors that shortens the life of the rolling bearing is, for example, inclusion of foreign matter in the bearing lubricating oil. As is well known, for example, lubricating oil for transmission contains foreign matters such as metal chips, shavings, burrs, etc., in addition to wear powder such as gear wear. Below, these foreign substances will damage the rolling elements of the bearing and the surfaces of the bearing rings. When this damage occurs, cracks may be generated from the damaged portion at an early stage, leading to flaking, and the life of the bearing is greatly reduced. The life of the bearing under lubrication with foreign matter may be reduced to about several tenths of that in a clean lubrication environment without foreign matter.
そこで、異物混入潤滑環境における軸受寿命の向上を
図るため各種の従来例が存在する。Therefore, there are various conventional examples in order to improve the life of the bearing in a lubricating environment in which foreign matters are mixed.
このような従来例として、次のようなものが存在す
る。As such conventional examples, there are the following.
軌道輪及び転動体の硬度を増大させる。例えば、軸
受鋼（SUJ2）を用いて、これに塩水焼入を施しロックウ
ェル硬さHRC64以上になるようにして軸受の硬度を上
げ、異物混入潤滑環境下で使用される軸受の寿命の低下
を防止する。Increase the hardness of races and rolling elements. For example, by using a bearing steel (SUJ2), this so as to become a water quenching subjected Rockwell hardness H R C64 or raise the hardness of the bearing, the life of the bearing, which is used in a contaminated lubrication environment Prevent drop.
軌道輪及び転動体の浸炭硬化層深さを深くする。例
えば、C;0.15〜0.4重量％の浸炭鋼に長時間の浸炭熱処
理を施し深い浸炭硬化層を形成する。浸炭硬化層を深く
形成することにより、軌道輪の軌道面及び転動体の転動
体の転動面に圧痕が付き難くして軸受の寿命を向上しよ
うとするものである。（特開昭62−132031号）。Increase the carburized hardened layer depth of the race and the rolling elements. For example, C: 0.15 to 0.4% by weight of carburized steel is subjected to a long-time carburizing heat treatment to form a deep carburized hardened layer. By forming the carburized hardened layer deeply, indentations are less likely to be formed on the raceway surface of the race and the rolling surface of the rolling element, and the life of the bearing is improved. (JP-A-62-132031).
材料の亀裂靱性を高める。例えば、軸受鋼（SUJ3又
はSUJ5）を用いてマルテンパー等の恒温熱処理を施す。
これにより亀裂靱性を高め、異物圧痕部に亀裂が生じた
後亀裂の進展を遅らせ、軸受の寿命を向上させよえとし
ている（特公昭62−29487号）。Increase the crack toughness of the material. For example, using a bearing steel (SUJ3 or SUJ5), a constant temperature heat treatment such as mar tempering is performed.
This increases the toughness of the crack, delays the growth of the crack after the occurrence of a crack in the foreign material indented portion, and improves the life of the bearing (Japanese Patent Publication No. Sho 62-29487).
しかしながら前記従来例には次のような課題が存在し
ていた。However, the conventional example has the following problems.
先ずの従来例においては、異物による圧痕の付き方
は少し軽くなるが、軌道輪及び転動体の硬度が高すぎる
ため、軌道面及び転動面の靱性が乏しくなり、一旦圧痕
が付くとそこからのクラックの進展は却って早くなり、
むしろ軸受の寿命は短くなる傾向となる。First, in the conventional example, the indentation due to foreign matter is slightly lighter, but the hardness of the race and the rolling element is too high, so that the toughness of the raceway surface and the rolling surface is poor, and once the indentation is formed, The crack progresses faster,
Rather, the life of the bearing tends to be shorter.
またの従来例においては、深い浸炭層を形成するた
めに熱処理時間が長くなり、そしての従来例では、特
殊な恒温熱処理を必要とするため、両者とも熱処理生産
性が低下する。さらに、このような熱処理を行っても、
未だ異物混入潤滑環境下での充分な寿命が得られていな
い。Further, in the conventional example, the heat treatment time becomes long to form a deep carburized layer, and in the conventional example, a special constant temperature heat treatment is required, so that both of the heat treatment productivity are reduced. Furthermore, even if such a heat treatment is performed,
Sufficient life has not yet been obtained in a lubricating environment with foreign matter.
そこで、この出願の発明者は、転がり軸受の耐転がり
疲れ性を向上するために、耐転がり疲れ性に効果のある
圧縮残留応力に着目し、いかなる値の圧縮残留応力を転
動部材に付与することが、異物混入潤滑環境下での耐転
がり疲労特性を向上できるかについて検討したものであ
る。Then, the inventor of this application pays attention to the compressive residual stress which is effective for the rolling fatigue resistance in order to improve the rolling fatigue resistance of the rolling bearing, and applies any value of the compressive residual stress to the rolling member. This study examined whether or not the above can improve the rolling fatigue resistance under a contaminated lubricating environment.
従って、本発明は、異物混入潤滑環境下での耐転がり
疲労特性を向上する上で必要な値の圧縮残留応力を有す
る転がり軸受を、提供することを目的とするものであ
る。Accordingly, an object of the present invention is to provide a rolling bearing having a compressive residual stress of a value necessary for improving the rolling fatigue resistance under a lubricating environment in which foreign matter is mixed.
そこで、請求項１記載の発明では、軌道輪及び転動体
からなる転がり軸受において、前記軌道輪及び転動体の
少なくとも一方の、最表面部における最大圧縮残留応力
を100kgf/mm2以上にし、且つ表面下300μｍの位置にお
ける圧縮残留応力を40kgf/mm2以上にした転がり軸受と
している。Therefore, according to the first aspect of the present invention, in a rolling bearing including a bearing ring and a rolling element, the maximum compressive residual stress at the outermost surface of at least one of the bearing ring and the rolling element is set to 100 kgf / mm 2 or more. The rolling bearing has a compressive residual stress of at least 40 kgf / mm 2 at a position of 300 μm below.
また、請求項２記載の発明では、前記請求項１におい
て、前記最大圧縮残留応力及び圧縮残留応力を、浸炭焼
入硬化後ショットピーニングを施して得た転がり軸受と
している。According to a second aspect of the present invention, there is provided the rolling bearing according to the first aspect, wherein the maximum compressive residual stress and the compressive residual stress are obtained by performing shot peening after carburizing and hardening.
本発明者が、いかなる値の圧縮残留応力を転がり軸受
に付与することが、異物混入潤滑環境下での耐転がり疲
労特性を向上することができるかについて鋭意検討した
ところ、最表面部（０〜50μｍ）における最大圧縮残留
応力を100kgf/mm2以上にすると充分な転動寿命を確保す
ることができることを見いだした。特に、さらに加えて
表面下300μｍの位置の圧縮残留応力を40kgf/mm2以上に
すると前記転動寿命はさらに充分になることも分かっ
た。The inventor of the present invention has conducted intensive studies on what value of compressive residual stress applied to a rolling bearing can improve the rolling fatigue resistance in a lubricating environment in which contaminants are mixed. It has been found that a sufficient rolling life can be secured by setting the maximum compressive residual stress at 50 μm) to 100 kgf / mm 2 or more. In particular, it was also found that when the compressive residual stress at a position 300 μm below the surface was set to 40 kgf / mm 2 or more, the rolling life was further improved.
かかる圧縮残留応力を軌道輪及び転動体の少なくとも
一方に付与することにより、部材表面の硬さが大きくな
り異物による圧痕が付き難くなると供に、クラックの発
明及び進展に抵抗するようになる。この結果、クリーン
な潤滑環境下ばかりでなく異物混入潤滑環境下での寿命
が向上する。By applying such compressive residual stress to at least one of the bearing ring and the rolling element, the hardness of the member surface is increased and indentations due to foreign matter are less likely to occur, and the invention is resistant to cracking and development. As a result, the service life is improved not only in a clean lubrication environment but also in a contaminated lubrication environment.
圧縮残留応力を前記の値にするためには、浸炭焼入硬
化後ショットピーニングを施すのが好適である。In order to set the compressive residual stress to the above value, it is preferable to perform shot peening after carburizing, quenching and hardening.
（実施例１） 次の第１表に示すように、試験鋼球Ａ〜Ｃを作成し
た。(Example 1) As shown in the following Table 1, test steel balls A to C were prepared.
ショトピーニングは、第４図記載の直圧式ノズル型シ
ョトピーニング装置を使用して行った。先ず、本装置の
構成について説明する。 Shot peening was performed using a direct pressure nozzle type shot peening apparatus shown in FIG. First, the configuration of the present apparatus will be described.
本装置は、ショト粒１が充填された加圧タンク２と、
この加圧タンクに加圧空気を供給する加圧空気供給管３
と、加圧タンク２内に供給された空気を排気する排気管
４と、前記加圧タンクの下部に配設され、前記加圧空気
供給管の分岐管５からの圧縮空気とショト粒とを混合す
るミキサ６と、ショト７を先端のノズル８から被処理物
表面に投射するホース９と、前記加圧タンク内にシャッ
タ10を介してショト粒を供給するホッパ11と、前記分岐
管の途中に設けられ、ショト粒の投射速度を調整するた
めに空気圧を調整可能なバブル12と、から構成されてい
る。The apparatus comprises a pressurized tank 2 filled with shot particles 1,
Pressurized air supply pipe 3 for supplying pressurized air to this pressurized tank
And an exhaust pipe 4 for exhausting the air supplied into the pressurized tank 2, and a compressed air and a shot particle which are provided at a lower portion of the pressurized tank and are branched from a branch pipe 5 of the pressurized air supply pipe. A mixer 6 for mixing, a hose 9 for projecting a shot 7 from a nozzle 8 at the tip to the surface of the workpiece, a hopper 11 for supplying shot particles into the pressurized tank via a shutter 10, and a middle of the branch pipe. And a bubble 12 whose air pressure can be adjusted to adjust the projection speed of shot particles.
本実施例では、ショト粒として、平均粒径0.72mmの平
均硬さHRC61の鋼球を使用し、ショト投射速度が32〜120
m/sec.（平均投射速度80m/sec.）となるようにショトピ
ーニング処理を行った。尚、このショトピーニングの
際、バブル12の開度を調整して空気圧を変更することよ
り鋼球に形成される残留応力分布のパターンを変更させ
た。In this embodiment, as Shoto grains, using steel balls having an average mean hardness of the particle diameter 0.72 mm H R C61, Shoto blasting speed is 32 to 120
Shot peening was performed so that the average projection speed was 80 m / sec. During the shot peening, the pattern of the residual stress distribution formed on the steel ball was changed by adjusting the opening of the bubble 12 and changing the air pressure.
そして、このような各試験鋼球を、第５図に示すよう
な内輪51,外輪52,内輪ロッド53,保持器54からなるボー
ル寿命試験機の内外輪間に配置して、内輪回転数6000rp
m,潤滑油；＃68モービル油、潤滑油中混入異物;Fe3C系
粉，径74〜147μm,300ppm、最大接触面圧（Pmax）;500k
gf/mm2の条件で寿命試験を行った。尚、の試験に際し
て、異物混入下において、内外輪にクラックが発生する
のを防止するため、鋼球の相手材である内外輪を、残留
オーステナイト量が35vol％であるSCr420Hで形成した
（特開昭64−55423号）。Then, such test steel balls are arranged between the inner and outer rings of a ball life tester including an inner ring 51, an outer ring 52, an inner ring rod 53 and a retainer 54 as shown in FIG.
m, lubricating oil; # 68 mobile oil, foreign matter mixed in lubricating oil; Fe 3 C-based powder, diameter 74-147 μm, 300 ppm, maximum contact surface pressure (P max ); 500 k
A life test was performed under the conditions of gf / mm 2 . In the test, in order to prevent the occurrence of cracks in the inner and outer rings when foreign substances are mixed, the inner and outer rings, which are the mating members of the steel balls, were formed of SCr420H having a residual austenite amount of 35 vol% (Japanese Patent Laid-Open Publication No. No. 64-55423).
以上の寿命試験の結果の第１図に示す。そして、各試
験鋼球について、表面下の残留応力の分布パターンを第
２図に示す。FIG. 1 shows the results of the above life test. FIG. 2 shows the distribution pattern of the residual stress under the surface of each test steel ball.
第１図及び第２図から分かるように、通常の焼入鋼で
ある試験鋼球Ａでは、表面における圧縮残留応力が小さ
いため、寿命試験の結果が三つの鋼球と中でもっとも小
さい値となっている。As can be seen from FIG. 1 and FIG. 2, the test steel ball A, which is a normal hardened steel, has a small compressive residual stress on the surface. Has become.
これに対して、試験鋼球Ｂでは、最表面部（０〜50μ
ｍ）における圧縮残留応力の値の最大値が、100kgf/mm2
以上であるため、試験鋼球Ａよりも寿命試験の結果が良
好となる。そして、試験鋼球Ｃで、最表面部における圧
縮残留応力の値の最大値が、100kgf/mm2以上であり、且
つ表面下300μｍの位置での残留圧縮応力が40kgf/mm2以
上であるため、もっとも寿命が良好であるとの結果を得
た。On the other hand, in the test steel ball B, the outermost surface (0 to 50 μm)
m), the maximum value of the compressive residual stress is 100 kgf / mm 2
As described above, the result of the life test is better than that of the test steel ball A. And, in the test steel ball C, the maximum value of the compressive residual stress at the outermost surface is 100 kgf / mm 2 or more, and the residual compressive stress at the position 300 μm below the surface is 40 kgf / mm 2 or more. The result was that the life was the best.
（実施例２） 次の第２表に示す円板状試験片１〜11を作成し、それ
ぞれ第２表に記載の熱処理及びショトピーニング加工を
行った。ここで、各熱処理及びショットピーニング加工
の条件は前記第１の実施例の条件と同一である。そし
て、前記第１の実施例と同様にショトピーニング処理の
際の圧縮空気圧を変化させることにより試験片の表面に
形成される残留応力の分布が変わるようにした。(Example 2) Disc-shaped test pieces 1 to 11 shown in the following Table 2 were prepared, and heat treatment and shot peening described in Table 2 were respectively performed. Here, the conditions of each heat treatment and shot peening are the same as those of the first embodiment. Then, similarly to the first embodiment, the distribution of the residual stress formed on the surface of the test piece was changed by changing the compressed air pressure during the shot peening process.
これらの各試験片について残留応力の値をＸ線残留応
力測定により測定し、且つ、各試験片のスラスト寿命の
測定した。この寿命測定は、「特殊鋼便覧（第１版，電
気製鋼研究所編，理工学社,1969年５月25日発行）の第1
0〜21頁」記載のスラスト形軸受鋼試験機を用いて、Ｎ
＝1000rpm,Pmax＝500kgf/mm2,潤滑油；＃68モービル
油、潤滑油中混入異物;Fe3C系粉，径74〜147μm,300ppm
の条件下で行った。For each of these test pieces, the value of the residual stress was measured by X-ray residual stress measurement, and the thrust life of each test piece was measured. This life measurement is described in the special steel handbook (1st edition, edited by Electric Steel Research Institute, published by Rigaku Kogyo, May 25, 1969).
Using a thrust type bearing steel tester described on page
= 1000 rpm, P max = 500 kgf / mm 2 , lubricating oil; # 68 mobile oil, foreign matter mixed in lubricating oil; Fe 3 C-based powder, diameter 74-147 μm, 300 ppm
Was performed under the following conditions.
寿命の判定に際しては、試験片にフレーキング，割れ
が発生する時点をもって寿命と判定し、この寿命を各試
験片の全数の10％にフレーキング，割れが発生するまで
の累積回転数を表現した（L10,90％残留寿命）。In determining the service life, the point at which flaking and cracking occurred in the test piece was judged as the service life, and this life was expressed as the cumulative number of revolutions until flaking and cracking occurred in 10% of the total number of each test piece. (L 10, 90% residual life).
圧縮残留応力測定結果を第２表に示し、そして、寿命
試験の結果を第３図に示す。尚、第３図において、各数
字は、各試験片のNo.を示す。Table 2 shows the measurement results of the compressive residual stress, and FIG. 3 shows the results of the life test. In FIG. 3, each numeral indicates the number of each test piece.
第２表及び第３図から分かるように、最表面部（０〜
50μｍ）での残留圧縮応力が100kgf/mm2以上である試験
片7,8では比較例に係る試験片１〜６の試験片と比較し
て、転動疲労寿命が長いことが分かる。また、表面下30
0μｍでの圧縮残留応力が、40kgf/mm2以上でもある試験
片10,11は、さらに長寿命であることが分かる。 As can be seen from Table 2 and FIG.
It can be seen that the rolling fatigue life of the test pieces 7 and 8 having a residual compressive stress at 50 μm) of 100 kgf / mm 2 or more is longer than those of the test pieces 1 to 6 according to the comparative example. Also below the surface 30
It can be seen that the test pieces 10 and 11 having the compressive residual stress at 0 μm of 40 kgf / mm 2 or more have a longer life.
本実施例では、材料の表面に圧縮残留応力を形成する
方法として、ショットピーニング加工を使用したが、そ
の他の手段として、公知の肌焼（浸炭，浸炭窒化、高周
波焼入）のみを使用して、必要な残留応力を材料に付与
することも可能である。尚、ショットピーニングによれ
ば、圧縮残留応力を付与するために、長時間の熱処理等
を必要としないため、熱処理生産性が低下することがな
い。In the present embodiment, shot peening was used as a method of forming a compressive residual stress on the surface of the material, but as other means, only known case hardening (carburizing, carbonitriding, induction hardening) was used. It is also possible to apply necessary residual stress to the material. In addition, according to shot peening, a long-time heat treatment or the like is not required in order to impart a compressive residual stress, so that heat treatment productivity does not decrease.
また、本発明に使用される材料としては、公知の高炭
素クロム軸受鋼（SUJ2他），浸炭用軸受鋼（SCr420H
他），高温用高速度鋼（M50）等各種のものを使用する
ことができる。The materials used in the present invention include known high-carbon chromium bearing steel (SUJ2 and others) and carburizing bearing steel (SCr420H).
Others), various types such as high-speed steel for high temperature (M50) can be used.
そしてまた、本発明においては、不純物、特に酸素含
有量が、O;9ppm重量％以下の高清浄度鋼を使用すること
が好ましい。Ｏは、酸化物系非金属介在物であるAl2O3
等の発生原因である。非金属介在物は転がり軸受の転動
の際の応力集中源となり、ここを起点としてクラックが
発生して寿命低下の要因となることも考えられるからで
ある。Further, in the present invention, it is preferable to use a high-cleanliness steel having an impurity, particularly an oxygen content of O: 9 ppm by weight or less. O is an oxide-based nonmetallic inclusion Al 2 O 3
And so on. This is because nonmetallic inclusions may be a source of stress concentration during rolling of the rolling bearing, and cracks may be generated from this as a starting point, leading to a reduction in service life.
以上説明したように、請求項１の発明によれば、クリ
ーンな潤滑環境下ばかりでなく、異物混入潤滑環境下で
の転がり軸受の転動疲労寿命の顕著に向上することがで
きた。また、請求項２の発明によれば、請求項１の発明
の前記効果に加えて、最表面部における最大圧縮残留応
力と表面下300μｍの位置における圧縮残留応力を増大
させる手段が具体的になった。As described above, according to the first aspect of the invention, the rolling fatigue life of the rolling bearing can be remarkably improved not only in a clean lubrication environment but also in a contaminated lubrication environment. According to the invention of claim 2, in addition to the effect of the invention of claim 1, means for increasing the maximum compressive residual stress at the outermost surface and the compressive residual stress at a position 300 μm below the surface is concrete. Was.
第１図は、本発明の実施例に係る鋼球の寿命試験におい
て、内輪累積回転数と累積破損率との関係を示す特性
図、第２図は、この鋼球の残留応力の分布を示す特性
図、第３図は、本発明の実施例に係る円板状試験片のス
ラスト寿命試験において、円板状試験片の表面残留応力
と応力繰り返し数との関係を示す特性図、第４図はショ
ットピーニング加工装置の構成図、第５図はボール寿命
試験機の構成図である。FIG. 1 is a characteristic diagram showing the relationship between the inner ring cumulative rotation speed and the cumulative damage rate in a life test of a steel ball according to an embodiment of the present invention, and FIG. 2 shows the distribution of residual stress of the steel ball. FIG. 3 is a characteristic diagram showing a relationship between the surface residual stress of the disk-shaped test piece and the number of stress repetitions in a thrust life test of the disk-shaped test piece according to the embodiment of the present invention, and FIG. Is a block diagram of a shot peening machine, and FIG. 5 is a block diagram of a ball life tester.
Claims (2)
いて、前記軌道輪及び転動体の少なくとも一方の、最表
面部における最大圧縮残留応力を100kgf/mm2以上にし、
且つ表面下300μｍの位置における圧縮残留応力を40kgf
/mm2以上にしたことを特徴とする転がり軸受。1. A rolling bearing comprising a bearing ring and a rolling element, wherein at least one of the bearing ring and the rolling element has a maximum compressive residual stress at the outermost surface portion of 100 kgf / mm 2 or more,
And the compressive residual stress at the position 300μm below the surface is 40kgf
A rolling bearing characterized by having a thickness of / mm 2 or more.
を、浸炭焼入硬化後ショットピーニングを施して得たこ
とを特徴とする請求項１記載の転がり軸受。2. The rolling bearing according to claim 1, wherein said maximum compressive residual stress and said compressive residual stress are obtained by carburizing, quenching and hardening and then performing shot peening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16635590A JP2949794B2 (en) | 1990-06-25 | 1990-06-25 | Rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16635590A JP2949794B2 (en) | 1990-06-25 | 1990-06-25 | Rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0454312A JPH0454312A (en) | 1992-02-21 |
| JP2949794B2 true JP2949794B2 (en) | 1999-09-20 |
Family
ID=15829851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16635590A Expired - Lifetime JP2949794B2 (en) | 1990-06-25 | 1990-06-25 | Rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949794B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7681896B2 (en) | 2005-07-11 | 2010-03-23 | Jtekt Corporation | Thrust bearing and suspension for vehicle |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05239550A (en) * | 1992-02-27 | 1993-09-17 | Ntn Corp | Rolling parts |
| JP3003386B2 (en) * | 1992-04-06 | 2000-01-24 | 日本精工株式会社 | Rolling sliding parts |
| US5361648A (en) * | 1992-04-07 | 1994-11-08 | Nsk Ltd. | Rolling-sliding mechanical member |
| DE4324833C2 (en) * | 1992-07-23 | 1997-06-05 | Nsk Ltd | Contact surface of a rolling or sliding pairing |
| JPH0735217A (en) * | 1993-07-23 | 1995-02-07 | Nippon Seiko Kk | Rolling slide part |
| WO2000050781A1 (en) | 1999-02-22 | 2000-08-31 | Nsk Ltd. | Rolling bearing and method of machining rolling element of the bearing |
| JP3975314B2 (en) * | 1999-08-27 | 2007-09-12 | 株式会社ジェイテクト | Bearing part material and rolling bearing raceway manufacturing method |
| DE10222266B4 (en) * | 2002-05-18 | 2006-08-10 | Schaeffler Kg | Contamination-resistant rolling elements for rolling bearings |
| JP2006144934A (en) * | 2004-11-19 | 2006-06-08 | Toyoda Mach Works Ltd | Power transmission shaft |
| JP6872900B2 (en) * | 2016-12-28 | 2021-05-19 | Thk株式会社 | Exercise guidance device life diagnostic device, method, program and system |
-
1990
- 1990-06-25 JP JP16635590A patent/JP2949794B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7681896B2 (en) | 2005-07-11 | 2010-03-23 | Jtekt Corporation | Thrust bearing and suspension for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0454312A (en) | 1992-02-21 |
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