JP2000234147A - Needle roller bearing - Google Patents
Needle roller bearingInfo
- Publication number
- JP2000234147A JP2000234147A JP15915499A JP15915499A JP2000234147A JP 2000234147 A JP2000234147 A JP 2000234147A JP 15915499 A JP15915499 A JP 15915499A JP 15915499 A JP15915499 A JP 15915499A JP 2000234147 A JP2000234147 A JP 2000234147A
- Authority
- JP
- Japan
- Prior art keywords
- needle roller
- needle
- bearing
- roller bearing
- surface layer
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Rolling Contact Bearings (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、異物が侵入しや
すく、温度上昇が大きい条件下での使用に好適な針状こ
ろ軸受に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle roller bearing suitable for use under conditions where foreign substances easily enter and a temperature rise is large.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】自動
車のトランスミッション等に適用される転がり軸受は、
歯車と同一容器内で使用されるため、潤滑油中に混入す
る歯車の欠け片や摩耗粉等の微小な硬い異物の侵入が避
けられない。これらの異物は転動体の転走面に噛み込ま
れ、転動体や軌道輪に表面剥離を生じさせて軸受寿命を
短くする可能性がある。この表面剥離は、異物の噛み込
みで生じた圧痕からの亀裂の発生と進展に因るものと考
えられている。2. Description of the Related Art Rolling bearings applied to automobile transmissions and the like are:
Since it is used in the same container as the gears, it is inevitable that minute hard foreign substances such as chipped pieces of gears and abrasion powder mixed into the lubricating oil enter. These foreign substances may be caught by the rolling surface of the rolling element, causing surface separation on the rolling element and the race, thereby shortening the life of the bearing. It is considered that this surface peeling is caused by the generation and propagation of cracks from indentations caused by foreign matter biting.
【０００３】前記亀裂の発生と進展を抑制するために、
特公昭６２−２９４８７号公報には、軸受材料としてＳ
ＵＪ３相当鋼を用い、これを高温焼入れして残留オース
テナイトを増加させ、同時に亀裂敏感性を抑制するた
め、焼入れ過程の冷却速度を遅く制御する技術が開示さ
れ、特開平７−１９００７２号公報には、軌道輪の材料
にＳＵＪ３相当鋼を用い、上述の熱処理に浸炭窒化処理
を加えて表層部の残留オーステナイトをさらに増加させ
る技術が開示されている。In order to suppress the generation and propagation of the crack,
JP-B-62-29487 discloses that S is used as a bearing material.
UJ3 equivalent steel is quenched at a high temperature to increase the retained austenite, and at the same time, to suppress crack sensitivity, a technique is disclosed in which the cooling rate in the quenching process is controlled to be slow. A technique is disclosed in which SUJ3 equivalent steel is used as a material for a raceway, and carbonitriding is added to the above-described heat treatment to further increase retained austenite in a surface layer portion.
【０００４】一方、最近の針状ころ軸受の用途では、高
速回転時の回転効率を高めるため、粘度の低い潤滑油を
使用する機運があり、金属間接触の増大による軸受部で
の発熱が大きくなる傾向がある。また、針状ころ軸受は
軌道輪なしで軸に取り付けられる場合も多く、この場合
は、針状ころが研磨仕上げの粗い軸と直接接触して、こ
の傾向がより助長される可能性が高い。On the other hand, in recent applications of needle roller bearings, there is a tendency to use a low-viscosity lubricating oil in order to increase the rotation efficiency during high-speed rotation. Tend to be. In many cases, the needle roller bearing is mounted on the shaft without the race, and in this case, the needle roller comes into direct contact with the polished shaft, and this tendency is likely to be further promoted.
【０００５】上述した軸受部での発熱が大きい用途で
は、針状ころは熱容量が小さく、かつ他の部材との接触
による熱の拡散も少ないため、最も温度上昇が大きくな
る。このような使用条件下では、前記表面剥離により針
状ころの寿命が著しく低下し、前述した特公昭６２−２
９４８７号公報に開示の素材を用いても十分な耐久寿命
を確保できない問題がある。In applications in which heat is generated in the above-described bearing portion, the temperature of the needle roller is the largest because the heat capacity of the needle roller is small and the diffusion of heat due to contact with other members is small. Under such conditions of use, the life of the needle rollers was significantly reduced due to the surface peeling, and the above-mentioned Japanese Patent Publication No. Sho 62-2
There is a problem that a sufficient durable life cannot be ensured even if the material disclosed in Japanese Patent No. 9487 is used.
【０００６】そこで、この発明の課題は、異物が侵入
し、温度上昇が大きい使用条件下でも、針状ころの耐久
寿命を十分に確保できる針状ころ軸受を提供することで
ある。It is an object of the present invention to provide a needle roller bearing which can sufficiently secure the durable life of the needle roller even under a use condition in which a foreign substance enters and a temperature rise is large.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めに、この発明は、針状ころ軸受において、少なくとも
針状ころを、重量比にして、Ｃ：０．８〜１．５％、Ｓ
ｉ：０．４〜１．２％、Ｍｎ：０．８〜１．５％および
Ｃｒ：０．８〜１．８％を含有する鋼を素材とし、この
素材を浸炭窒化処理した後、焼入れ、焼戻し処理し、表
層部の残留オーステナイト量を２０〜４０体積％、表面
硬度をＨV ７５０以上とした構成を採用したものであ
る。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a needle roller bearing, wherein at least the needle rollers have a weight ratio of C: 0.8 to 1.5%. S
Steel containing i: 0.4 to 1.2%, Mn: 0.8 to 1.5% and Cr: 0.8 to 1.8% is used as a material, and after carbonitriding this material, it is quenched. and tempering treatment, the amount of retained austenite of the surface layer portion 20 to 40% by volume, in which the surface hardness is adopted a configuration in which the H V 750 or more.
【０００８】前記針状ころの素材とする鋼の組成につい
て、Ｃ量を０．８〜１．５％としたのは、基本的な焼入
れ硬度を確保するとともに、残留オーステナイト量を増
加させるためである。The reason why the amount of C is set to 0.8 to 1.5% in the steel composition used as the material of the needle roller is to secure the basic quenching hardness and increase the amount of retained austenite. is there.
【０００９】Ｓｉ量を０．４％以上としたのは、表層部
の残留オーステナイトを安定化するためと、焼戻し軟化
抵抗性のあるＳｉの添加で高温軟化を防止するためであ
り、上限を１．２％としたのは、これを越えると浸炭窒
化処理の過程で、炭素と窒素の侵入を阻害するからであ
る。The reason why the amount of Si is set to 0.4% or more is to stabilize the retained austenite in the surface layer portion and to prevent high-temperature softening by adding Si having tempering softening resistance. The reason for setting it to 0.2% is that if it exceeds this, the intrusion of carbon and nitrogen is hindered during the carbonitriding process.
【００１０】Ｍｎ量を０．８〜１．５％としたのは、焼
入れ性を確保して芯部まで焼入れするとともに、表層部
の残留オーステナイト量を高めるためである。過度のＭ
ｎ量の添加は、冷間加工性の低下や焼き割れの原因とな
るとともに、表層部の残留オーステナイト量が過多とな
って軟化の原因となるため、上限を１．５％とした。[0010] The reason why the Mn content is set to 0.8 to 1.5% is to secure the hardenability and harden to the core, and to increase the amount of retained austenite in the surface layer. Excessive M
Since the addition of the amount of n causes a reduction in cold workability and quenching cracks, and an excessive amount of retained austenite in the surface layer portion causes softening, the upper limit is made 1.5%.
【００１１】Ｃｒ量を０．８〜１．８％としたのは、
０．８％未満では、高温においても必要な表面硬度を維
持できる程度の炭化物が形成されず、１．８％を越える
と炭化物が粗大化して表面剥離の起点となり易くなるか
らである。The reason why the amount of Cr is set to 0.8 to 1.8% is as follows.
If it is less than 0.8%, carbides are not formed to the extent that the required surface hardness can be maintained even at high temperatures, and if it exceeds 1.8%, the carbides become coarse and easily become the starting point of surface peeling.
【００１２】このような組成の鋼を針状ころの素材と
し、浸炭窒化処理で表層部の窒素含有量を高めると、表
層部のＭｓ点（マルテンサイト変態開始温度）が内部よ
りも低くなるので、これを焼入れすると、針状ころの表
層部で未変態のオーステナイトが多くなり、表層部の残
留オーステナイト量を２０体積％以上にすることができ
る。When steel having such a composition is used as a material for needle rollers and the nitrogen content in the surface layer is increased by carbonitriding, the Ms point (martensite transformation start temperature) in the surface layer becomes lower than that in the interior. When this is quenched, untransformed austenite increases in the surface layer portion of the needle roller, and the amount of retained austenite in the surface layer portion can be increased to 20% by volume or more.
【００１３】残留オーステナイトは、高い靱性と加工硬
化特性を有し、亀裂の発生や進展を抑える働きをする
が、熱に対して不安定な難点がある。前記浸炭窒化処理
で表層部に侵入した窒素原子は残留オーステナイト中に
固溶し、残留オーステナイトを熱に対して安定化する役
割をする。また、Ｍｓ点が低下した表層部は、マルテン
サイト変態が内部より遅れて始まり、かつその変態量も
内部より少ないので、表層部には圧縮の残留応力が形成
され、表層部の疲労強度を高めることもできる。[0013] Retained austenite has high toughness and work hardening properties, and functions to suppress the generation and propagation of cracks, but has a disadvantage that it is unstable to heat. The nitrogen atoms that have penetrated into the surface layer by the carbonitriding process form a solid solution in the retained austenite, and serve to stabilize the retained austenite against heat. Further, in the surface layer portion in which the Ms point is lowered, the martensitic transformation starts later than the inside and the amount of the transformation is smaller than the inside, so that residual stress of compression is formed in the surface layer and the fatigue strength of the surface layer is increased. You can also.
【００１４】前記表層部の残留オーステナイト量を２０
〜４０体積％としたのは、表層部に適度の靱性を付与
し、異物の噛み込みによる過大な応力増加を緩和するた
めである。すなわち、残留オーステナイト量が２０体積
％未満では靱性が不足し、残留オーステナイト量が４０
体積％を越えると、硬度が低下し過ぎて下記のＨV ７５
０以上という条件を満たすことができず、また塑性変形
による表面粗さの劣化を招く。The amount of retained austenite in the surface layer is 20
The reason for setting the content to ４０40% by volume is to impart appropriate toughness to the surface layer portion and to alleviate an excessive increase in stress due to foreign matter being caught. That is, if the amount of retained austenite is less than 20% by volume, the toughness is insufficient, and the amount of retained austenite is 40%.
If it exceeds the volume%, the hardness is too low and the following H V 75
The condition of 0 or more cannot be satisfied, and the surface roughness is deteriorated due to plastic deformation.
【００１５】また、表面硬度をＨV ７５０以上としたの
は、針状ころが耐熱性を要求される環境で使用されるこ
とが多く、高温にさらされたときに軟化した場合であっ
ても十分な耐久性を得るには、表面硬度がＨV ７５０以
上、好ましくは７７５以上必要なためである。Further, the surface hardness was H V 750 or more, often needle rollers are used in an environment where heat resistance is required, even when softens when exposed to high temperatures to obtain sufficient durability, surface hardness H V 750 or more, because preferably required 775 or more.
【００１６】異物を噛み込んだ場合や表面温度上昇が大
きい場合、および相手面が粗面である場合には、亀裂の
起点が表面やごく表層（表面から０．１ｍｍ以内）とな
る可能性が高いので、上述した表層部の材質改良により
針状ころの長寿命化を図ることができる。When foreign matter is caught, when the surface temperature rise is large, or when the mating surface is rough, there is a possibility that the starting point of the crack may be on the surface or the very surface layer (within 0.1 mm from the surface). Since it is high, the service life of the needle roller can be prolonged by improving the material of the surface layer described above.
【００１７】上述した浸炭窒化処理を含む熱処理は、浸
炭性雰囲気にアンモニアガスを添加した高温ガス中で浸
炭窒化処理したのち、焼入れ、焼戻しする方法を採用す
ることができる。なお、残留オーステナイト量を調整す
るために、サブゼロ処理を熱処理工程の中に組み入れて
もよい。The heat treatment including the carbonitriding treatment described above can employ a method of performing a carbonitriding treatment in a high-temperature gas obtained by adding an ammonia gas to a carburizing atmosphere, followed by quenching and tempering. In order to adjust the amount of retained austenite, a sub-zero treatment may be incorporated in the heat treatment step.
【００１８】前記針状ころの素材とする鋼に、重量比に
して０．３％以下のＭｏを添加することにより、焼入れ
性を改善することができる。The hardenability can be improved by adding 0.3% by weight or less of Mo to the steel used as the material for the needle rollers.
【００１９】また、前記焼入れを８３０〜８８０℃から
開始し、３００℃から１５０℃までの温度範囲における
焼入れ冷却時の冷却能Ｈを０．２ｃｍ-1以下とすること
により、Ｍｓ点近傍での冷却速度を遅くして、亀裂敏感
値を３以下にすることができる。亀裂敏感値を３以下に
すると、使用中に亀裂が発生するのを防止したり、亀裂
が生じたとしてもその進展速度を抑制するのに有効であ
る。３００℃から１５０℃までの温度範囲における焼入
れ冷却時の冷却能Ｈを０．２ｃｍ-1以下とする手段とし
ては、所定の温度に昇温した油や塩浴に焼入れする方法
を採用することができる。Further, the quenching is started from 830 to 880 ° C., and the cooling capacity H at the time of quenching and cooling in a temperature range from 300 ° C. to 150 ° C. is set to 0.2 cm −1 or less, so that the temperature around the Ms point is reduced. By lowering the cooling rate, the crack sensitivity can be reduced to 3 or less. When the crack sensitivity value is 3 or less, it is effective to prevent the occurrence of cracks during use and to suppress the growth rate of cracks even if they occur. As a means for setting the cooling capacity H at the time of quenching cooling in the temperature range of 300 ° C. to 150 ° C. to 0.2 cm −1 or less, a method of quenching oil or a salt bath heated to a predetermined temperature may be adopted. it can.
【００２０】なお、針状ころ軸受が内外輪の軌道輪の両
方またはいずれか一方を有する場合は、これらの軌道輪
にも、前記針状ころと同様の素材を用いて、同様の熱処
理を施すことができる。When the needle roller bearing has both or one of the inner and outer races, these races are also subjected to the same heat treatment using the same material as the needle rollers. be able to.
【００２１】[0021]
【発明の実施の形態】図１（ａ）は、針状ころ軸受の実
施形態を示す。この針状ころ軸受は、複数の針状ころ１
が保持器２に保持されたものであり、各針状ころ１は、
表１に実施例Ａとして示す化学成分を有する鋼を素材と
して成形し、これらをアンモニアガスが添加された８６
０℃の浸炭性雰囲気中で浸炭窒化処理したのち、２２０
℃に昇温した塩浴中へ焼入れして、３００℃から１５０
℃までの温度範囲における焼入れ冷却時の冷却能Ｈが
０．２ｃｍ-1以下となるように製造したものである。各
針状ころ１の表面には、図１（ｂ）に示すように、残留
オーステナイト量が２０〜４０体積％、表面硬度がＨV
７５０以上の浸炭窒化層１ａが形成されている。FIG. 1 (a) shows an embodiment of a needle roller bearing. This needle roller bearing includes a plurality of needle rollers 1.
Are held by a retainer 2, and each needle roller 1 is
The steel having the chemical components shown in Example A in Table 1 was formed as a raw material, and these were formed by adding 86% ammonia gas.
After carbonitriding in a carburizing atmosphere at 0 ° C., 220
Quenched into a salt bath heated to 300 ° C,
It is manufactured so that the cooling capacity H at the time of quenching and cooling in a temperature range up to ° C. is 0.2 cm -1 or less. As shown in FIG. 1B, the surface of each needle roller 1 has a retained austenite amount of 20 to 40% by volume and a surface hardness of H V.
750 or more carbonitrided layers 1a are formed.
【００２２】[0022]
【表１】 [Table 1]
【００２３】以下に実施例および比較例を挙げる。Examples and comparative examples will be described below.
【００２４】[0024]
【実施例】上述した実施例Ａの針状ころ軸受の他に、３
種類の化学成分を有する鋼を素材として、実施例Ａと同
様の熱処理で製造した針状ころを用いた針状ころ軸受
（表１中の実施例Ｂ〜Ｄ）を用意した。軸受の寸法は、
いずれも内径２４ｍｍ、外径３２ｍｍである。EXAMPLE In addition to the needle roller bearing of Example A described above,
Needle roller bearings (Examples B to D in Table 1) using steel having various chemical components as raw materials and using needle rollers manufactured by the same heat treatment as in Example A were prepared. The dimensions of the bearing are
Each has an inner diameter of 24 mm and an outer diameter of 32 mm.
【００２５】[0025]
【比較例】表１に示した実施例Ａ〜Ｄとそれぞれ同じ化
学成分の鋼を素材として、浸炭窒化処理なしで、８６０
℃から２２０℃の塩浴中へ焼入れした針状ころを用いた
針状ころ軸受（表１中の比較例Ｅ〜Ｈ）と、本願の化学
成分範囲を外れる組成の鋼を、上述した実施例と同じ条
件で熱処理した針状ころを用いた針状ころ軸受（表１中
の比較例Ｉ〜Ｋ）を用意した。また、従来多用されてい
る軸受鋼ＳＵＪ２を標準焼入れした針状ころを用いた針
状ころ軸受（表１中の比較例Ｓ）も用意した。各軸受の
寸法は実施例と同じである。COMPARATIVE EXAMPLE A steel having the same chemical composition as in Examples A to D shown in Table 1 was used as a raw material without carbonitriding treatment.
Needle roller bearings (Comparative Examples E to H in Table 1) using needle rollers quenched into a salt bath at a temperature of from 220 ° C. to 220 ° C., and steel having a composition outside the chemical composition range of the present invention were used in the above-described Examples. Needle roller bearings (Comparative Examples I to K in Table 1) using needle rollers that were heat-treated under the same conditions as in Example 1 were prepared. Needle roller bearings (Comparative Example S in Table 1) using needle rollers obtained by standard quenching of bearing steel SUJ2, which has been widely used in the past, were also prepared. The dimensions of each bearing are the same as in the embodiment.
【００２６】上記実施例および比較例について、針状こ
ろ単体の粗面鋼球を相手とした転動試験と、針状ころ軸
受を異物が混入された潤滑油を封入したケース内の回転
軸に取り付けた異物下寿命試験を実施した。For the above Examples and Comparative Examples, a rolling test was conducted on a roughened steel ball of a needle roller alone, and a needle roller bearing was mounted on a rotating shaft in a case filled with lubricating oil mixed with foreign matter. A life test under the attached foreign matter was performed.
【００２７】各試験条件は以下の通りである。なお、各
試験のサンプル数は、いずれもＮ＝１０とした。The test conditions are as follows. The number of samples in each test was N = 10.
【００２８】（転動試験） 相手鋼球 ：５／８インチ（表面粗度Ｒａ＝０．０８
μｍ） 最大接触圧力：５．９ ＧＰａ 負荷速度 ：１４６００ ｃｐｍ(cycle per minute) 潤滑油 ：タービンＶＧ１０ （異物下寿命試験） 負荷荷重：５．８８ ｋＮ 回転数 ：７０００ ｒｐｍ 潤滑油 ：タービンＶＧ５６（油浴） 異物 ：ガスアトマイズ金属粉（粒径３２〜５３μ
ｍ、硬度ＨV ７００〜８００、混入量０．４ｇ／リット
ル）(Rolling test) Mating steel ball: 5/8 inch (surface roughness Ra = 0.08)
μm) Maximum contact pressure: 5.9 GPa Load speed: 14600 cpm (cycle per minute) Lubricating oil: Turbine VG10 (lifetime test under foreign matter) Load: 5.88 kN Rotational speed: 7000 rpm Lubricating oil: Turbine VG56 (oil Bath) Foreign matter: gas atomized metal powder (particle size 32 to 53μ)
m, hardness H V 700-800, mixing amount 0.4 g / liter)
【００２９】[0029]
【表２】 [Table 2]
【００３０】各試験結果を表２に示す。表中のＬ１０寿
命は、サンプルの９０％が破損しないで使える時間であ
る。実施例の針状ころと針状ころ軸受は、転動試験およ
び異物下寿命試験のいずれにおいても、従来品の比較例
Ｓに対するＬ１０寿命の寿命比が５倍以上の優れた値を
示している。Table 2 shows the test results. The L10 life in the table is the time that 90% of the sample can be used without being damaged. In both the rolling test and the life test under foreign matter, the needle roller and the needle roller bearing of the examples show an excellent value in which the life ratio of the L10 life to the comparative example S of the conventional product is 5 times or more. .
【００３１】これに対して、浸炭窒化処理なしの比較例
Ｅ〜Ｈは、転動試験および異物下寿命試験のいずれにお
いても、前記寿命比が３倍に満たない。一方、素材の化
学成分範囲が外れる比較例Ｉ〜Ｋは、転動試験の寿命比
は比較的高い値を示すが、異物下寿命試験の寿命比が劣
っている。これは、Ｓｉ量が過多の比較例Ｉでは浸炭窒
化が阻害されること、Ｃｒ量が過多の比較例Ｊでは炭化
物が粗大化すること、Ｍｎ量が過多の比較例Ｋでは表層
部の残留オーステナイト量が４０体積％を越えること
に、それぞれ起因しているものと思われる。On the other hand, in Comparative Examples E to H without carbonitriding, the life ratio was less than three times in both the rolling test and the life test under foreign matter. On the other hand, in Comparative Examples I to K in which the range of the chemical components of the material is out of the range, the life ratio of the rolling test shows a relatively high value, but the life ratio of the life test under the foreign matter is inferior. This is because carbonitriding is inhibited in Comparative Example I where the amount of Si is excessive, carbides are coarsened in Comparative Example J where the amount of Cr is excessive, and residual austenite in the surface layer portion in Comparative Example K where the amount of Mn is excessive. It is considered that the amount exceeds 40% by volume, respectively.
【００３２】[0032]
【発明の効果】以上のように、この発明の針状ころ軸受
は、針状ころの素材としてＳｉとＭｎの含有量を高めた
鋼を用い、これを浸炭窒化処理したのち焼入れ、針状こ
ろ表層部の残留オーステナイト量を２０〜４０体積％、
表面高度をＨV ７５０以上としたので、亀裂の発生と進
展による表面剥離の発生を抑制し、異物が侵入したり、
軸受部での発熱が大きい使用条件下での針状ころの耐久
寿命を著しく改善することができる。As described above, the needle roller bearing of the present invention uses steel having a high content of Si and Mn as a raw material for the needle roller, which is carbonitrided, quenched, and then needle-rolled. 20 to 40% by volume of retained austenite in the surface layer,
Since the surface hardness was H V 750 or more, to suppress the generation of surface peeling due to occurrence and development of a crack, foreign matter or intrusion,
The durable life of the needle roller under use conditions in which heat generated in the bearing portion is large can be remarkably improved.
【図１】ａは実施形態の針状ころ軸受を示す縦断面図、
ｂはａの要部拡大断面図FIG. 1A is a longitudinal sectional view showing a needle roller bearing according to an embodiment,
b is an enlarged sectional view of a main part of a.
１ 針状ころ １ａ 浸炭窒化層 ２ 保持器 DESCRIPTION OF SYMBOLS 1 Needle roller 1a Carbonitrided layer 2 Cage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡山 智雄 三重県桑名市大字東方字尾弓田3066 エヌ ティエヌ株式会社内 Ｆターム(参考） 3J101 AA14 AA24 AA32 AA42 AA52 AA62 BA10 DA02 DA03 EA02 FA31 GA01 GA11 4K042 AA22 DA01 DA02 DA06 DE05 DE06 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoo Okayama 3066 Oyumida, O-Ju, Kuwana-shi, Mie F-term in NTN Corporation (reference) 3J101 AA14 AA24 AA32 AA42 AA52 AA62 BA10 DA02 DA03 EA02 FA31 GA01 GA11 4K042 AA22 DA01 DA02 DA06 DE05 DE06
Claims (3)
ころを、重量比にして、Ｃ：０．８〜１．５％、Ｓｉ：
０．４〜１．２％、Ｍｎ：０．８〜１．５％およびＣ
ｒ：０．８〜１．８％を含有する鋼を素材とし、この素
材を浸炭窒化処理した後、焼入れ、焼戻し処理し、表層
部の残留オーステナイト量を２０〜４０体積％、表面硬
度をＨV ７５０以上としたことを特徴とする針状ころ軸
受。In a needle roller bearing, at least the needle rollers are in a weight ratio of C: 0.8 to 1.5%, Si:
0.4-1.2%, Mn: 0.8-1.5% and C
r: A steel containing 0.8 to 1.8% is used as a material. After carbonitriding the material, the material is quenched and tempered to reduce the amount of retained austenite in the surface layer to 20 to 40% by volume and the surface hardness to H. Needle roller bearings having V 750 or more.
比にして０．３％以下のＭｏを添加した請求項１に記載
の針状ころ軸受。2. The needle roller bearing according to claim 1, wherein 0.3% by weight or less of Mo is added to steel used as a material of the needle roller.
し、３００℃から１５０℃までの温度範囲における焼入
れ冷却時の冷却能Ｈを０．２ｃｍ-1以下とした請求項１
または２に記載の針状ころ軸受。3. The quenching is started at 830 to 880 ° C., and the cooling capacity H during quench cooling in a temperature range from 300 ° C. to 150 ° C. is set to 0.2 cm −1 or less.
Or the needle roller bearing according to 2.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15915499A JP2000234147A (en) | 1998-12-17 | 1999-06-07 | Needle roller bearing |
| US09/461,187 US6423158B1 (en) | 1998-12-17 | 1999-12-15 | Rolling bearings and gear shaft support device |
| FR9915836A FR2787529B1 (en) | 1998-12-17 | 1999-12-15 | ROLLING BEARINGS AND TRANSMISSION SHAFT SUPPORT DEVICE |
| DE19960803A DE19960803A1 (en) | 1998-12-17 | 1999-12-16 | Roller bearing, especially for a vehicle drive shaft bearing unit, e.g. in a differential, has rollers of a carbonitrided, quenched and tempered chromium steel with high carbon, silicon and manganese contents |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35946298 | 1998-12-17 | ||
| JP10-359462 | 1998-12-17 | ||
| JP15915499A JP2000234147A (en) | 1998-12-17 | 1999-06-07 | Needle roller bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000234147A true JP2000234147A (en) | 2000-08-29 |
Family
ID=26486037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15915499A Pending JP2000234147A (en) | 1998-12-17 | 1999-06-07 | Needle roller bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000234147A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6843605B2 (en) | 2001-09-26 | 2005-01-18 | Ntn Corporation | Roller thrust bearing |
| WO2006013756A1 (en) * | 2004-08-02 | 2006-02-09 | Nsk Ltd. | Rotation support device |
| JP2007177897A (en) * | 2005-12-28 | 2007-07-12 | Nsk Ltd | Roller bearing |
| JP2012149304A (en) * | 2011-01-19 | 2012-08-09 | Nsk Ltd | Heat treatment method of track member |
-
1999
- 1999-06-07 JP JP15915499A patent/JP2000234147A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6843605B2 (en) | 2001-09-26 | 2005-01-18 | Ntn Corporation | Roller thrust bearing |
| US7273319B2 (en) | 2001-09-26 | 2007-09-25 | Ntn Corporation | Roller thrust bearing |
| US7707723B2 (en) | 2001-09-26 | 2010-05-04 | Ntn Corporation | Method of producing a roller thrust bearing having a plurality of rows of rollers |
| WO2006013756A1 (en) * | 2004-08-02 | 2006-02-09 | Nsk Ltd. | Rotation support device |
| JP2006046391A (en) * | 2004-08-02 | 2006-02-16 | Nsk Ltd | Rotation support device |
| JP4581542B2 (en) * | 2004-08-02 | 2010-11-17 | 日本精工株式会社 | Rotating support device |
| US8322931B2 (en) | 2004-08-02 | 2012-12-04 | Nsk Ltd. | Rotation support apparatus |
| JP2007177897A (en) * | 2005-12-28 | 2007-07-12 | Nsk Ltd | Roller bearing |
| JP2012149304A (en) * | 2011-01-19 | 2012-08-09 | Nsk Ltd | Heat treatment method of track member |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4423754B2 (en) | Manufacturing method of rolling shaft | |
| JP3593668B2 (en) | Rolling bearing | |
| US5338377A (en) | Ball-and-roller bearing | |
| US6423158B1 (en) | Rolling bearings and gear shaft support device | |
| JP3435799B2 (en) | Rolling bearing | |
| JP4810157B2 (en) | Rolling bearing | |
| JP2885829B2 (en) | Rolling bearing | |
| JP2011208745A (en) | Rolling bearing | |
| JPH07190072A (en) | Method for thermally treating rolling bearing | |
| JP2003193200A (en) | Antifriction bearing | |
| JP2002180203A (en) | Needle bearing components, and method for producing the components | |
| JP2002364648A (en) | Rolling bearing | |
| JP2000234147A (en) | Needle roller bearing | |
| JP5070735B2 (en) | Rolling bearing | |
| JP2009204076A (en) | Rolling bearing | |
| JP2010031307A (en) | Roller bearing | |
| JP2010001521A (en) | Shaft and pinion shaft | |
| JP2001187921A (en) | Needle roller bearing parts | |
| JP2000234145A (en) | Roller bearing | |
| JP2008232212A (en) | Rolling device | |
| JP2000161363A (en) | Tapered roller bearing and gear shaft supporting device for vehicle | |
| JP2000234128A (en) | Gear shaft support device of transmission for vehicle | |
| JP3084421B2 (en) | Rolling bearing made of carburized steel | |
| JP2006138376A (en) | Radial needle roller bearing | |
| JP2000233656A (en) | Gear shaft support device for vehicle differential gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040318 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20041006 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041012 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050301 |