JP2005337362A - Full type roller bearing - Google Patents

Full type roller bearing Download PDF

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JP2005337362A
JP2005337362A JP2004156394A JP2004156394A JP2005337362A JP 2005337362 A JP2005337362 A JP 2005337362A JP 2004156394 A JP2004156394 A JP 2004156394A JP 2004156394 A JP2004156394 A JP 2004156394A JP 2005337362 A JP2005337362 A JP 2005337362A
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mass
content
less
surface layer
roller
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Takashi Sakaguchi
尚 坂口
Kenji Yamamura
賢二 山村
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NSK Ltd
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NSK Ltd
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    • 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
    • F16C33/34—Rollers; Needles
    • 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
    • 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
    • F16C33/64—Special methods of manufacture
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii
    • F16C2240/80—Pitch circle diameters [PCD]
    • F16C2240/82—Degree of filling, i.e. sum of diameters of rolling elements in relation to PCD
    • F16C2240/84—Degree of filling, i.e. sum of diameters of rolling elements in relation to PCD with full complement of balls or rollers, i.e. sum of clearances less than diameter of one rolling element

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a full type roller bearing having a long rolling fatigue life. <P>SOLUTION: A cylindrical roller 3 of this full type roller bearing is manufactured by machining raw material made of steel to a predetermined form, and performing carbonitriding, quenching and tempering at a temperature from 200°C to 300°C in this order for the formed material. The steel is composed of C having a percentage content of 0.30 mass% to 1.20 mass% both inclusive, Si having a percentage content of 0.50 mass % to 2.00 mass% both inclusive, Mn having a percentage content of 0.50 mass% to 2.00 mass% both inclusive, Cr having a percentage content of 0.50 mass% to 2.00 mass% both inclusive, O having a percentage content of 12ppm or less, and the residue, which is Fe and obligatory impurity. The N percentage content of a surface layer part forming a rolling surface 3A is set to 0.2 mass% to 2.0 mass% both inclusive, the C percentage content of the surface layer part is set to 0.6 mass% to 2.5 mass% both inclusive, the hardness of the surface layer part is set to Hv650 or higher, and the residual austenite quantity of the surface layer part ranges above 0 volume% under 20 volume%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、総ころ軸受に関する。   The present invention relates to a full roller bearing.

ころ軸受等の転がり軸受は、高面圧下で繰り返し剪断応力を受けて使用されるため、この剪断応力に耐えて転がり疲れ寿命を確保する必要がある。このため、転がり軸受の軌道輪（内輪，外輪）および転動体としては、高炭素クロム軸受鋼二種（ＳＵＪ２）に焼入れおよび焼戻し処理を施したり、肌焼鋼（ＳＣＲ４２０，ＳＣＭ４２０，ＳＡＥ４３２０Ｈ等）に浸炭または浸炭窒化処理、焼入れおよび焼戻し処理を施すことにより、表面硬さをＨｖ６５０〜８００としたものが用いられている。   Rolling bearings such as roller bearings are used under repeated shear stress under high surface pressure, and therefore it is necessary to withstand this shear stress and ensure a rolling fatigue life. For this reason, as the bearing rings (inner ring, outer ring) and rolling elements of the rolling bearing, the high carbon chromium bearing steel type 2 (SUJ2) is subjected to quenching and tempering treatment, or the case hardening steel (SCR420, SCM420, SAE4320H, etc.). Carburizing or carbonitriding treatment, quenching and tempering treatment are used to make the surface hardness Hv650-800.

近年、自動車，工作機械，一般産業機械，鉄鋼設備等の動力伝達機構や支持機構に使用される転がり軸受において、経済性および信頼性の向上が求められてきている。
ここで、軌道輪の内外周面端部に形成された鍔部でころを保持する総ころ軸受は、保持器でころを保持するころ軸受と比較して、(1) 高負荷で使用可能、(2) 製造性が良好、(3) 低コストで製造可能という長所を有するため、経済性を向上させるために有効である。 In recent years, in rolling bearings used in power transmission mechanisms and support mechanisms for automobiles, machine tools, general industrial machines, steel equipment, etc., improvement in economy and reliability has been demanded.
Here, the total roller bearing that holds the rollers with the flanges formed on the inner and outer peripheral surface ends of the bearing ring is (1) can be used with higher load than the roller bearing that holds the rollers with a cage. (2) Good manufacturability, (3) It can be manufactured at low cost, and is effective in improving economy.

しかし、総ころ軸受は、保持器を有さないことにより、軌道輪ところの間のスキューによるすべりや、金属製のころ同士の接触によるすべりが生じるため、表面損傷が起こり易いという短所を有する。このため、総ころ軸受は、信頼性の点でさらなる改善の余地があり、特に、すべり等の表面損傷が起こり易い場合に用いることは難しい。
表面損傷による寿命低下は、異物の噛み込みによって軌道面に圧痕が生じ、圧痕の縁に応力集中が発生した場合や、潤滑不足によって軌道面ところとの接触面、または金属製のころ同士の接触面に大きな接線力が発生した場合に起こる。 However, since the full roller bearing does not have a cage, slippage due to skew between the raceways and slippage due to contact between metal rollers occurs, and thus has a disadvantage that surface damage is likely to occur. For this reason, the full complement roller bearing has room for further improvement in terms of reliability, and is particularly difficult to use when surface damage such as slip is likely to occur.
Life reduction due to surface damage is caused by indentation on the raceway surface due to foreign matter biting, stress concentration occurring on the edge of the indentation, contact surface with the raceway surface due to insufficient lubrication, or contact between metal rollers Occurs when a large tangential force is generated on the surface.

このような表面損傷による寿命低下を防止するために、特許文献１では、少なくともころを、質量比で、Ｃ含有率が０．８％以上１．５％以下、Ｓｉ含有率が０．４以上１．２％以下、Ｍｎ含有率が０．８％以上１．５％以下、Ｃｒ含有率が０．８％以上１．８％以下の鋼からなる素材を所定形状に加工した後、浸炭窒化処理、焼入れ処理および焼戻し処理を施すことにより、表層部の残留オーステナイト量を２０％体積以上５０体積％以下にすることが提案されている。この特許文献１では、少なくともころの表層部において、応力集中を緩和する効果が高い残留オーステナイト量を高くすることにより、表面損傷を抑制し、転がり疲れ寿命の向上を図っている。   In order to prevent such a decrease in life due to surface damage, in Patent Document 1, at least the rollers are in mass ratio, the C content is 0.8% or more and 1.5% or less, and the Si content is 0.4 or more. Carbon steel nitriding after processing a material made of steel with 1.2% or less, Mn content of 0.8% or more and 1.5% or less, and Cr content of 0.8% or more and 1.8% or less into a predetermined shape It has been proposed that the amount of retained austenite in the surface layer portion is 20% by volume or more and 50% by volume or less by performing treatment, quenching treatment, and tempering treatment. In Patent Document 1, at least in the surface layer portion of the roller, the amount of retained austenite, which has a high effect of reducing stress concentration, is increased, thereby suppressing surface damage and improving the rolling fatigue life.

また、特許文献２では、内輪軌道面およびころの転がり面に、それらの母線の形状が王冠（クラウン）状となるように曲率またはテーパを持たせる加工（以下、「クラウニング加工」と称する。）を施して、内輪軌道面のクラウニング量ところのクラウニング量の和が所定式を満たすようにすることが提案されている。この特許文献２では、軌道輪ところの間のスキューによるすべりや、金属製のころ同士の接触によるすべりが原因となって生じる表面損傷を抑制し、転がり疲れ寿命の向上を図っている。
特開２０００−２３４１４５号公報 特開２００１−６５５７４号公報 Further, in Patent Document 2, the inner ring raceway surface and the rolling surface of the roller are provided with a curvature or a taper so that the shape of the generatrix thereof becomes a crown shape (hereinafter referred to as “crowning process”). It is proposed that the sum of the crowning amount of the inner ring raceway surface satisfies the predetermined formula. In Patent Document 2, surface damage caused by slippage due to skew between raceways and contact between metal rollers is suppressed, and the rolling fatigue life is improved.
JP 2000-234145 A JP 2001-65574 A

しかしながら、特許文献１に記載のころ軸受では、特に、表面損傷による寿命低下が問題となるころの寿命については考慮されているが、ころに接触する軌道輪の寿命については考慮されていない。このため、例えば、ころの寿命のみを高くしても、軌道輪の寿命が不足して、ころ軸受全体の寿命を長くできない場合がある。
さらに、上述した特許文献２に記載のころ軸受には、軌道輪ところの間および金属製のころ同士間のすべりによる表面損傷を抑制するという点でさらなる改善の余地がある。
そこで、本発明は、これらの問題を解決するためになされたものであり、軌道輪ところの間および金属製のころ同士間のすべりによる表面損傷を抑制することで、転がり疲れ寿命の長い総ころ軸受を提供することを課題としている。 However, in the roller bearing described in Patent Document 1, the life of the roller, in which a decrease in the life due to surface damage is a problem, is considered, but the life of the race that contacts the roller is not considered. For this reason, for example, even if only the life of the roller is increased, the life of the bearing ring may be insufficient and the life of the entire roller bearing may not be extended.
Furthermore, the roller bearing described in Patent Document 2 described above has room for further improvement in terms of suppressing surface damage due to slippage between the raceway rings and between the metal rollers.
Accordingly, the present invention has been made to solve these problems, and suppresses surface damage due to slippage between the raceway rings and between the metal rollers, thereby reducing the total rolling fatigue life. The problem is to provide a bearing.

このような課題を解決するために、本発明は、内輪と、外輪と、前記内輪および外輪の間に転動自在に配設された複数のころと、を備え、前記内輪の外周面端部および前記外輪の内周面端部の少なくとも一つに、ころを保持する鍔部が形成されている総ころ軸受において、前記ころは、Ｃ含有率が０．３０質量％以上１．２０質量％以下、Ｓｉ含有率が０．５０質量％以上２．００質量％以下、Ｍｎ含有率が０．２０質量％以上２．００質量％以下、Ｃｒ含有率が０．５０質量％以上２．００質量％以下、Ｏ含有率が１２ｐｐｍ以下、残部がＦｅおよび不可避不純物である鋼からなる素材を所定形状に加工した後、浸炭窒化処理と、焼入れ処理と、２００℃以上３００℃以下での焼戻し処理とがこの順に施されて得られ、その転がり面をなす表層部のＮ含有率が０．２質量％以上２．０質量％以下で、Ｃ含有率が０．６質量％以上２．５質量％以下で、前記表層部の硬さがＨｖ６５０以上で、前記表層部の残留オーステナイト量が０体積％超え２０体積％未満となっていることを特徴とする総ころ軸受を提供する。
なお、本発明において、前記表層部とは、表面から所定深さ（例えば、１μｍ）までの範囲を指す。 In order to solve such a problem, the present invention includes an inner ring, an outer ring, and a plurality of rollers disposed so as to be able to roll between the inner ring and the outer ring, and an outer peripheral end portion of the inner ring. In addition, in the full roller bearing in which at least one end portion of the inner peripheral surface of the outer ring is provided with a flange portion that holds the roller, the roller has a C content of 0.30% by mass or more and 1.20% by mass. Hereinafter, the Si content is 0.50% by mass or more and 2.00% by mass or less, the Mn content is 0.20% by mass or more and 2.00% by mass or less, and the Cr content is 0.50% by mass or more and 2.00% by mass. %, O content is 12 ppm or less, and the material made of steel with the balance being Fe and inevitable impurities is processed into a predetermined shape, followed by carbonitriding, quenching, and tempering at 200 ° C. to 300 ° C. Are applied in this order and form the rolling surface. The N content of the layer part is 0.2% by mass or more and 2.0% by mass or less, the C content is 0.6% by mass or more and 2.5% by mass or less, and the hardness of the surface layer part is Hv650 or more, There is provided a full complement roller bearing characterized in that the amount of retained austenite in the surface layer portion is more than 0% by volume and less than 20% by volume.
In the present invention, the surface layer portion refers to a range from the surface to a predetermined depth (for example, 1 μm).

以下、本発明の数値限定の臨界的意義について詳細に説明する。
〔Ｃ含有率（質量比）：０．３０〜１．２０％〕
Ｃ（炭素）は、基地をマルテンサイト化することにより、強度を増加させるために必要な元素である。本発明においては、鋼からなる素材を所定形状に加工した後に浸炭窒化処理が施され、ころの表層部にＣおよびＮ（窒素）が添加される。よって、素材のＣ含有率は、ころの芯部に必要な強度を確保するために０．３０％以上とする。なお、ころの芯部硬さはＨｖ６５０以上であることが好ましく、そのためにＣ含有率は０．８０％以上とすることが好ましい。
一方、Ｃ含有率が多過ぎると、製鋼時に粗大な炭化物が生成して、転がり疲れ寿命を低下させる場合がある。このため、Ｃ含有率は１．２０％以下とする。 Hereinafter, the critical significance of the numerical limitation of the present invention will be described in detail.
[C content (mass ratio): 0.30 to 1.20%]
C (carbon) is an element necessary for increasing the strength by converting the base into martensite. In the present invention, carbonitriding is performed after processing a steel material into a predetermined shape, and C and N (nitrogen) are added to the surface layer of the roller. Therefore, the C content of the material is set to 0.30% or more in order to secure the necessary strength for the roller core. In addition, it is preferable that the core part hardness of a roller is Hv650 or more, and it is preferable to make C content rate into 0.80% or more for that purpose.
On the other hand, if the C content is too high, coarse carbides may be generated during steel making, which may reduce the rolling fatigue life. For this reason, C content rate shall be 1.20% or less.

〔Ｓｉ含有率（質量比）：０．５０〜２．００％〕
Ｓｉ（ケイ素）は、製鋼時の脱酸剤として作用するとともに、焼戻し軟化抵抗性を向上させるために必要な元素である。また、浸炭窒化処理を施す場合に、ころの表層部のＮ含有率を高くする作用もある。
本発明者らが実験を行った結果、ころを構成する素材としてＳｉ含有率が０．５０％以上の鋼を用いて、浸炭窒化処理、焼入れ処理、および２００℃以上３００℃以下の高温での焼戻し処理を施すことにより、軌道輪の表面損傷を抑制する効果が得られることを見出した。これにより、Ｓｉ含有率は０．５０％以上、好ましくは０．８０％以上とする。
一方、Ｓｉ含有率が多過ぎると、素材の被削性を低下させて、コストの上昇を招く場合があるため、Ｓｉ含有率は２．００％以下、好ましくは１．５０％以下とする。 [Si content (mass ratio): 0.50 to 2.00%]
Si (silicon) is an element necessary for improving the resistance to temper softening while acting as a deoxidizer during steelmaking. In addition, when carbonitriding is performed, there is also an effect of increasing the N content of the surface layer portion of the roller.
As a result of experiments conducted by the present inventors, using a steel having a Si content of 0.50% or more as a material constituting the rollers, carbonitriding, quenching, and at a high temperature of 200 ° C. to 300 ° C. It has been found that the effect of suppressing the surface damage of the bearing ring can be obtained by performing the tempering treatment. Thereby, the Si content is set to 0.50% or more, preferably 0.80% or more.
On the other hand, if the Si content is too high, the machinability of the material may be reduced, leading to an increase in cost. Therefore, the Si content is set to 2.00% or less, preferably 1.50% or less.

〔Ｍｎ含有率（質量比）：０．２０〜２．００％〕
Ｍｎ（マンガン）は、製鋼時の脱酸剤および脱硫剤として作用するとともに、焼入れ性の向上に必要な元素である。この効果を得るために、Ｍｎ含有率は０．２０％以上、好ましくは０．２５％以上とする。一方、Ｍｎの含有率が多過ぎると、非金属介在物が多くなり過ぎて転がり疲れ寿命が低下するとともに、素材の鍛造性や被削性等の機械加工性が低下するため、Ｍｎ含有率は２．００％以下とする。 [Mn content (mass ratio): 0.20 to 2.00%]
Mn (manganese) is an element necessary for improving hardenability while acting as a deoxidizer and desulfurizer during steelmaking. In order to obtain this effect, the Mn content is 0.20% or more, preferably 0.25% or more. On the other hand, if the Mn content is too high, the amount of non-metallic inclusions increases and the rolling fatigue life decreases, and the machinability such as the forgeability and machinability of the material decreases. 2.00% or less.

〔Ｃｒ含有率（質量比）：０．５０〜２．００％〕
Ｃｒ（クロム）は、焼入れ性および焼戻し軟化抵抗性を向上させるとともに、基地を強化して転がり疲れ寿命を向上させるために必要な元素である。また、微細で高硬度の炭化物や炭窒化物を形成して、耐摩耗性を向上させる作用もある。さらに、浸炭窒化層のＣ含有率を高める作用があり、浸炭窒化特性の向上にも有効である。これらの効果を得るために、Ｃｒ含有率を０．５０％以上とする。
一方、Ｃｒ含有率が多過ぎると、その効果が飽和するだけでなく、表層部に不動態膜が形成されて浸炭窒化特性を阻害する場合があるため、Ｃｒ含有率は２．００％以下とする。 [Cr content (mass ratio): 0.50 to 2.00%]
Cr (chromium) is an element necessary for improving hardenability and temper softening resistance and strengthening the base to improve rolling fatigue life. It also has the effect of improving wear resistance by forming fine and hard carbides and carbonitrides. Furthermore, it has the effect | action which raises C content rate of a carbonitriding layer, and is effective also in the improvement of a carbonitriding characteristic. In order to obtain these effects, the Cr content is set to 0.50% or more.
On the other hand, if the Cr content is too high, not only the effect is saturated, but also a passive film is formed on the surface layer portion and may impair the carbonitriding characteristics, so the Cr content is 2.00% or less. To do.

〔Ｏ含有率（質量比）：１２ｐｐｍ以下〕
Ｏ（酸素）は、転がり疲れ寿命に悪影響を与える酸化物系非金属介在物を形成するため、その含有率を出来る限り少なくする必要があるが、Ｏ含有率が１２ｐｐｍ以下、好ましくは９ｐｐｍ以下であれば許容できる。
〔不可避不純物について〕
上記元素以外に、不可避不純物（例えば、Ｐ，Ｓ，Ｎｉ，Ｃｕ，Ｍｏ，Ｖ，Ａｌ，Ｔｉ，Ｎｂ等）が含まれてもよい。
このうち、ＭｏやＶ等の炭化物形成元素は、浸炭窒化処理により微細で高硬度な炭窒化物を形成するため、耐摩耗性の向上に有効である。よって、これらの元素は、コストの許す限り添加してもよいが、その添加量は合計で２．００質量％以下とすることが好ましい。 [O content (mass ratio): 12 ppm or less]
O (oxygen) forms oxide-based non-metallic inclusions that adversely affect the rolling fatigue life, so its content must be reduced as much as possible, but the O content is 12 ppm or less, preferably 9 ppm or less. Acceptable if any.
[About inevitable impurities]
In addition to the above elements, inevitable impurities (for example, P, S, Ni, Cu, Mo, V, Al, Ti, Nb, etc.) may be included.
Of these, carbide-forming elements such as Mo and V are effective in improving wear resistance because they form fine and high-hardness carbonitrides by carbonitriding. Therefore, these elements may be added as long as the cost permits, but the total amount added is preferably 2.00% by mass or less.

〔熱処理について〕
まず、上述した鋼からなる素材を、鍛造又は切削によりころの形状に加工した後、雰囲気温度８００〜８６０℃で、ＲＸガス＋エンリッチガス＋アンモニアガスを導入した炉内で、数時間加熱保持することで浸炭窒化処理を行う。
この浸炭窒化処理は、ころの表層部のＮ含有率が０．２質量％以上２．０質量％以下となるような条件で行う。 [About heat treatment]
First, the above-described steel material is processed into a roller shape by forging or cutting, and then heated and held for several hours in a furnace in which RX gas + enrich gas + ammonia gas is introduced at an ambient temperature of 800 to 860 ° C. Then, carbonitriding is performed.
This carbonitriding process is performed under conditions such that the N content of the surface layer of the roller is 0.2% by mass or more and 2.0% by mass or less.

このとき、ころの表層部のＮ含有率が０．２質量％未満となると、ころと接触する軌道輪の表面損傷を抑制する効果が十分に得られない。一方、表層部のＮ含有率は高くなる程、軌道輪の表面損傷を抑制する効果が高くなるが、表層部のＮ含有率が２．０質量％を超えると、浸炭窒化層が脆弱となり、総ころ軸受として十分な転がり疲れ寿命が得られない。上述した観点から、ころの表層部のＮ含有率の好ましい範囲は、０．５質量％以上２．０質量％以下である。   At this time, if the N content of the surface layer portion of the roller is less than 0.2% by mass, the effect of suppressing the surface damage of the bearing ring in contact with the roller cannot be sufficiently obtained. On the other hand, the higher the N content of the surface layer portion, the higher the effect of suppressing the surface damage of the bearing ring, but when the N content of the surface layer portion exceeds 2.0 mass%, the carbonitrided layer becomes brittle, A rolling fatigue life sufficient as a full complement roller bearing cannot be obtained. From the viewpoint described above, a preferable range of the N content in the surface layer portion of the roller is 0.5% by mass or more and 2.0% by mass or less.

また、浸炭窒化処理により、Ｎと同様に添加されるＣ含有率は、ころの表層部に軸受部材として必要とされる表面硬さＨｖ６５０が得られるように、Ｎ含有率とＣ含有率の合計が０．８質量％以上となるようにＣ含有率を調節することが好ましく、Ｃ含有率は０．６質量％以上とする。一方、ころの表層部のＣ含有率が多過ぎると、粗大な炭化物が析出して、ころ自体の転がり疲れ寿命が十分に得られなくなるため、Ｃ含有率を２．５質量％以下、好ましくは２．０質量％以下とする。   Further, the carbon content added in the same manner as N by carbonitriding is the sum of the N content and the C content so that the surface hardness Hv650 required as a bearing member can be obtained in the surface layer portion of the roller. It is preferable to adjust the C content so that is 0.8 mass% or more, and the C content is 0.6 mass% or more. On the other hand, if the C content of the surface layer portion of the roller is too large, coarse carbides precipitate and the rolling fatigue life of the roller itself cannot be sufficiently obtained, so the C content is 2.5% by mass or less, preferably 2.0 mass% or less.

次に、８００〜８６０℃で焼入れ処理を行った後、２００℃以上３００℃以下で焼戻し処理を行う。このとき、焼戻し温度が２００℃未満であると、ころの表層部の残留オーステナイト量を２０体積％未満に出来ないため、ころと接触する軌道輪の表面損傷を抑制する効果が十分に得られない。一方、焼戻し温度が３００℃を超えると、ころの表層部の硬さおよび残留オーステナイト量を本発明の範囲内に出来なくなるため、ころ自体の転がり疲れ寿命が十分に得られない。ここで、ころの表層部の残留オーステナイト量が７体積％以上１８体積％未満となるように焼戻し温度を選定すると、軌道輪の表面損傷と、ころ自体の寿命低下を効果的に抑制できるため、ころ軸受としての転がり疲れ寿命を効果的に向上できる。   Next, after performing a quenching process at 800-860 degreeC, a tempering process is performed at 200 degreeC or more and 300 degrees C or less. At this time, if the tempering temperature is less than 200 ° C., the amount of retained austenite in the surface layer portion of the roller cannot be made less than 20% by volume, so that the effect of suppressing the surface damage of the bearing ring in contact with the roller cannot be sufficiently obtained. . On the other hand, when the tempering temperature exceeds 300 ° C., the hardness of the surface layer portion of the roller and the amount of retained austenite cannot be within the range of the present invention, so that the rolling fatigue life of the roller itself cannot be sufficiently obtained. Here, if the tempering temperature is selected so that the amount of retained austenite in the surface layer portion of the roller is 7% by volume or more and less than 18% by volume, the surface damage of the bearing ring and the life reduction of the roller itself can be effectively suppressed. Rolling fatigue life as a roller bearing can be effectively improved.

本発明の総ころ軸受においては、前記ころの転がり面に、クラウニング加工が施されていることが好ましい。
また、本発明の総ころ軸受において、前記ころの転がり面の表面粗さは、前記内輪および外輪の軌道面の表面粗さよりも小さくなっていることが好ましい。
さらに、本発明の総ころ軸受においては、前記内輪および外輪の軌道面をなす表層部の硬さがＨｖ６５０以上で、前記表層部の残留オーステナイト量が０体積％超え４５体積％以下となっていることが好ましい。 In the full complement roller bearing of the present invention, it is preferable that a crowning process is applied to the rolling surface of the roller.
In the full complement roller bearing of the present invention, it is preferable that the surface roughness of the rolling surface of the roller is smaller than the surface roughness of the raceway surfaces of the inner ring and the outer ring.
Further, in the full complement roller bearing of the present invention, the hardness of the surface layer portion forming the raceway surface of the inner ring and the outer ring is Hv650 or more, and the amount of retained austenite of the surface layer portion is greater than 0% by volume and less than 45% by volume. It is preferable.

ここで、内輪および外輪の軌道面をなす表層部の硬さがＨｖ６５０未満であると、内輪および外輪として十分な転がり疲れ寿命が得られなくなる。
また、内輪および外輪の軌道面をなす表層部の残留オーステナイト量が４５体積％を超えると、鋼からなる素材が塑性変形を起こして寿命を低下させる場合がある。なお、内輪および外輪の軌道面をなす表層部の残留オーステナイト量は、内輪および外輪の軌道面における表面損傷を効果的に抑制するために、５体積％以上とすることが好ましい。 Here, when the hardness of the surface layer portion forming the raceway surface of the inner ring and the outer ring is less than Hv650, a rolling fatigue life sufficient for the inner ring and the outer ring cannot be obtained.
Further, if the amount of retained austenite in the surface layer portion forming the raceway surfaces of the inner ring and the outer ring exceeds 45% by volume, the material made of steel may cause plastic deformation and reduce the life. The amount of retained austenite in the surface layer portion that forms the raceway surfaces of the inner ring and the outer ring is preferably 5% by volume or more in order to effectively suppress surface damage on the raceway surfaces of the inner ring and the outer ring.

本発明の総ころ軸受によれば、ころの転がり面をなす表層部のＮ含有率、Ｃ含有率、硬さ、および残留オーステナイト量を特定することにより、ころ自体の表面損傷を抑制できるとともに、ころと接触する軌道輪の表面損傷も抑制できるため、転がり疲れ寿命を長くできる。
また、本発明のころ軸受によれば、ころと組み合わせる内輪および外輪の構成も特定することにより、転がり疲れ寿命をさらに長くできる。 According to the full roller bearing of the present invention, by specifying the N content, C content, hardness, and amount of retained austenite of the surface layer portion that forms the rolling surface of the roller, surface damage of the roller itself can be suppressed, Since the surface damage of the bearing ring in contact with the rollers can be suppressed, the rolling fatigue life can be extended.
Further, according to the roller bearing of the present invention, it is possible to further increase the rolling fatigue life by specifying the configuration of the inner ring and the outer ring combined with the roller.

以下、本発明の実施形態について図面を参照しながら説明する。
本実施形態では、図１に示す構成の総ころ軸受（内径１６０ｍｍ，外径２２０ｍｍ，幅３６ｍｍ）を、以下に示す方法で作製した。この総ころ軸受は、図１に示すように、内輪１と、外輪２と、複数の円筒ころ３と、からなる。円筒ころ３は、内輪１の外周面端部と外輪２の内周面端部に形成された鍔部１０，２０で保持されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a full roller bearing (inner diameter 160 mm, outer diameter 220 mm, width 36 mm) having the configuration shown in FIG. 1 was produced by the following method. As shown in FIG. 1, the full roller bearing includes an inner ring 1, an outer ring 2, and a plurality of cylindrical rollers 3. The cylindrical roller 3 is held by flanges 10 and 20 formed at the outer peripheral surface end of the inner ring 1 and the inner peripheral surface end of the outer ring 2.

円筒ころ３は、以下の手順で作製した。まず、表１に示す各構成の鋼からなる素材を鍛造して所定形状に加工した後、表１に示す各方法の熱処理を施した。次に、研削等の仕上げ加工を施して、転がり面３Ａの表面粗さ（Ｒａ）が０．０４〜０．０６μｍとなるように調整した。また、円筒ころ３には、その転がり面３Ａに、複数の円弧の組み合わせからなるクラウニング加工を施した。   The cylindrical roller 3 was produced by the following procedure. First, after forging the raw material which consists of steel of each structure shown in Table 1 and processing it into the predetermined shape, the heat processing of each method shown in Table 1 was given. Next, finishing processing such as grinding was performed, and the surface roughness (Ra) of the rolling surface 3A was adjusted to 0.04 to 0.06 μm. In addition, the cylindrical roller 3 was subjected to crowning processing including a combination of a plurality of arcs on the rolling surface 3A.

ここで、表１に「浸炭窒化→焼入れ→焼戻し」で示す熱処理は、以下に示す条件で行った。まず、Ｒｘガス＋プロパンガス＋アンモニアガスの雰囲気中において、８００〜８６０℃で２〜６時間保持することにより浸炭窒化を行った後、油焼入れを行った。次に、１８０〜３５０℃の範囲の所定温度で２時間保持することにより焼戻しを行った。
また、表１に「焼入れ→焼戻し」で示す熱処理は、以下に示す条件で行った。まず、Ｒｘガス雰囲気中において、８００〜８６０℃で０．５〜１時間保持した後、油焼入れを行った。次に、１８０℃で２時間保持することにより焼戻しを行った。 Here, the heat treatment shown in Table 1 as “carbonitriding → quenching → tempering” was performed under the following conditions. First, carbonitriding was performed by holding at 800 to 860 ° C. for 2 to 6 hours in an atmosphere of Rx gas + propane gas + ammonia gas, and then oil quenching was performed. Next, tempering was performed by holding at a predetermined temperature in the range of 180 to 350 ° C. for 2 hours.
Further, the heat treatment shown in Table 1 as “quenching → tempering” was performed under the following conditions. First, in an Rx gas atmosphere, after holding at 800 to 860 ° C. for 0.5 to 1 hour, oil quenching was performed. Next, tempering was performed by holding at 180 ° C. for 2 hours.

このようにして得られた円筒ころ３において、転がり面をなす表層部（表面から１μｍの深さまでの部分）のＮ含有率およびＣ含有率 (質量比）を、電子線マイクロアナライザ (ＥＰＭＡ）により測定した。その結果を、表１に併せて示す。
また、前記表層部の残留オーステナイト量γR ( 体積比）を、Ｘ線回折装置により測定した。その結果を、表１に併せて示す。
さらに、前記表層部の硬さ（ビッカース硬さ）を、ＪＩＳ Ｚ ２２４４に規定されたビッカース硬さ試験法により測定した。その結果を、表１に併せて示す。 In the cylindrical roller 3 obtained in this way, the N content and C content (mass ratio) of the surface layer portion (the portion from the surface to a depth of 1 μm) forming the rolling surface were measured by an electron beam microanalyzer (EPMA). It was measured. The results are also shown in Table 1.
Further, the amount of retained austenite γ R (volume ratio) of the surface layer portion was measured with an X-ray diffractometer. The results are also shown in Table 1.
Furthermore, the hardness (Vickers hardness) of the surface layer portion was measured by the Vickers hardness test method defined in JIS Z 2244. The results are also shown in Table 1.

また、内輪１および外輪２は、以下に示す手順で作製した。まず、高炭素クロム軸受鋼二種（ＳＵＪ２）からなる素材を所定形状に加工した後、焼入れおよび焼戻しを施すことにより、軌道面をなす表層部（表面から１μｍの深さまでの部分）の硬さをＨｖ６８０以上で、前記表層部の残留オーステナイト量を７体積％以下にした。次に、これらに研削等の仕上げ加工を施して、外輪軌道面２Ａおよび内輪軌道面１Ａの表面粗さ（Ｒａ）を、円筒ころ３の転がり面３Ａの表面粗さ（Ｒａ）よりも大きくなるように調整した。具体的には、内輪軌道面１Ａと外輪軌道面２Ａの表面粗さ（Ｒａ）を０．１〜０．５μｍとした。   Moreover, the inner ring | wheel 1 and the outer ring | wheel 2 were produced in the procedure shown below. First, after processing a material composed of two types of high carbon chromium bearing steel (SUJ2) into a predetermined shape, the hardness of the surface layer portion (the portion from the surface to a depth of 1 μm) is formed by quenching and tempering. The residual austenite amount in the surface layer portion was set to 7% by volume or less. Next, these are subjected to a finishing process such as grinding, so that the surface roughness (Ra) of the outer ring raceway surface 2A and the inner ring raceway surface 1A becomes larger than the surface roughness (Ra) of the rolling surface 3A of the cylindrical roller 3. Adjusted as follows. Specifically, the surface roughness (Ra) of the inner ring raceway surface 1A and the outer ring raceway surface 2A was set to 0.1 to 0.5 μm.

このようにして得られた内輪１、外輪２、および円筒ころ３を用いて、総ころ軸受を組み立てた。そして、この総ころ軸受を、表面損傷が生じ易い環境下で使用することを想定して、以下の条件で寿命試験を行った。この寿命試験は、円筒ころ３の転がり面３Ａに剥離が生じるまで内輪１を回転させることで行い、寿命試験開始から剥離が生じるまでの回転時間を寿命とした。この結果を、Ｎｏ．１６のＬ10寿命を１とした時の比として、表１に併せて示す。
〔寿命試験条件〕
荷重比（Ｐ／Ｃｒ）：０．４５
回転速度：１０００ｍｉｎ-1
潤滑油：♯６８タービン油
異物：（組成）Ｆｅ3 Ｃ
（硬さ）ＨＲＣ５２
（粒径）７４〜１４７μｍ
（混入量）潤滑油中に３００ｐｐｍとなるように混入 Using the inner ring 1, the outer ring 2, and the cylindrical roller 3 obtained in this manner, a full roller bearing was assembled. Then, assuming that this full complement roller bearing is used in an environment where surface damage is likely to occur, a life test was performed under the following conditions. This life test was performed by rotating the inner ring 1 until peeling occurred on the rolling surface 3A of the cylindrical roller 3, and the rotation time from the start of the life test until peeling occurred was defined as the life. This result is shown in No. 16 of L 10 life as a ratio when a 1, shown in Table 1.
[Life test conditions]
Load ratio (P / Cr): 0.45
Rotational speed: 1000min -1
Lubricating oil: # 68 Turbine oil Foreign matter: (Composition) Fe 3 C
(Hardness) HRC52
(Particle size) 74-147 μm
(Mixed amount) Mixed in the lubricating oil to 300ppm

Figure 2005337362
Figure 2005337362

表１に示すように、円筒ころ３の構成を、本発明の構成（鋼の組成と、熱処理方法と、焼戻し温度と、転がり面３Ａをなす表層部のＮ含有率，Ｃ含有率，残留オーステナイト量，硬さ）としたＮｏ．１〜１３は、本発明の構成外としたＮｏ．１４，１５と比べて長寿命であり、Ｎｏ．１６の２．２〜３．７倍の寿命が得られた。   As shown in Table 1, the configuration of the cylindrical roller 3 is the same as that of the present invention (steel composition, heat treatment method, tempering temperature, and N content, C content, retained austenite of the surface layer portion forming the rolling surface 3A. Number, hardness). Nos. 1 to 13 are Nos. Compared with Nos. 14 and 15, the service life is longer. A life of 2.2 to 3.7 times that of 16 was obtained.

このうち、「鋼を構成するＳｉ含有率が０．７５％以上２．００質量％以下」と、「表層部のＮ含有率が０．５質量％以上０．８質量％以下」を満たすものは、特に長寿命であり、Ｎｏ．１６の３．０倍以上の寿命が得られた。これは、鋼を構成するＳｉ含有率および表層部のＮ含有率の合計量が増加すると、円筒ころ３と内輪１および外輪２との間の摩擦抵抗が低減して、転がり疲れ寿命が向上したためであると考えられる。
一方、Ｎｏ．１４では、焼戻し温度が高過ぎたため、円筒ころ３の転がり面３Ａをなす表層部に残留オーステナイト量を存在させることが出来なかった。よって、円筒ころ３に形成される圧痕縁での応力集中軽減効果が十分に得られず、円筒ころ３にフレーキングが多発したため、短寿命であった。 Among these, “the Si content constituting the steel is 0.75% or more and 2.00% by mass or less” and “the N content of the surface layer portion is 0.5% by mass or more and 0.8% by mass or less” Has a particularly long life. A life of 3.0 or more times 16 was obtained. This is because the frictional resistance between the cylindrical roller 3 and the inner ring 1 and the outer ring 2 is reduced and the rolling fatigue life is improved when the total amount of the Si content constituting the steel and the N content of the surface layer portion is increased. It is thought that.
On the other hand, no. In No. 14, since the tempering temperature was too high, the amount of retained austenite could not be present in the surface layer portion forming the rolling surface 3A of the cylindrical roller 3. Therefore, the effect of reducing stress concentration at the indentation edge formed on the cylindrical roller 3 was not sufficiently obtained, and flaking occurred frequently on the cylindrical roller 3, resulting in a short life.

また、Ｎｏ．１５では、焼戻し温度が低過ぎたため、円筒ころ３の転がり面３Ａをなす表層部の残留オーステナイト量を本発明の範囲内（０体積％超え２０体積％未満）に出来なかった。よって、円筒ころ３と内輪１および外輪２との摩擦低減による寿命延長効果が十分に得られなかったため、短寿命であった。
以上の結果から、円筒ころ３を構成する鋼の組成と、円筒ころ３の転がり面３Ａをなす表層部のＮ含有率，Ｃ含有率，残留オーステナイト量，硬さとを本発明の構成とすることにより、表面損傷の生じ易い環境下で使用しても、総ころ軸受の寿命を長くできることが分かった。 No. In No. 15, since the tempering temperature was too low, the amount of retained austenite in the surface layer portion forming the rolling surface 3A of the cylindrical roller 3 could not be within the range of the present invention (over 0 vol% and less than 20 vol%). Accordingly, the life extension effect due to the reduction in friction between the cylindrical roller 3 and the inner ring 1 and the outer ring 2 was not sufficiently obtained, and thus the life was short.
From the above results, the composition of the steel constituting the cylindrical roller 3 and the N content, C content, residual austenite amount, and hardness of the surface layer portion forming the rolling surface 3A of the cylindrical roller 3 are configured as the present invention. Thus, it was found that the life of the full complement roller bearing can be extended even when used in an environment where surface damage is likely to occur.

次に、表２に示す各構成の鋼からなる素材を所定形状に加工した後、表２に示す各方法で熱処理を施すことにより、内輪１および外輪２を作製した。そして、これらに研削等の仕上げ加工を施して、内輪軌道面１Ａおよび外輪軌道面２Ａの表面粗さ（Ｒａ）を、０．１〜０．５μｍに調整した。なお、表２には、上述と同様の方法で測定した軌道面１Ａ，２Ａをなす表層部のＮ含有率およびＣ含有率と、前記表層部の残留オーステナイト量（γR ）と、前記表層部の硬さと、を併せて示した。 Next, after processing the raw material which consists of steel of each structure shown in Table 2 into a predetermined shape, the inner ring | wheel 1 and the outer ring | wheel 2 were produced by heat-processing with each method shown in Table 2. FIG. And finishing processing, such as grinding, was given to these, and the surface roughness (Ra) of inner ring raceway surface 1A and outer ring raceway surface 2A was adjusted to 0.1-0.5 micrometer. In Table 2, the N content and C content of the surface layer portion forming the raceway surfaces 1A and 2A, the amount of retained austenite (γ R ) of the surface layer portion, and the surface layer portion measured by the same method as described above. The hardness was also shown.

このようにして得られた表２に示す各構成の内輪１および外輪２と、上述した表１に示すＮｏ．１の構成（Ｎ含有率：０．６質量％，残留オーステナイト量：１０体積％，硬さ：Ｈｖ８０２，表面粗さ（Ｒａ）：０．０５μｍ）の円筒ころ３を用いて、総ころ軸受を組み立てた。そして、この総ころ軸受において、上述と同様の条件で寿命試験を行った。この結果を、表１に示すＮｏ．１６のＬ10寿命を１とした時の比として、表２に併せて示す。 The inner ring 1 and the outer ring 2 having the respective configurations shown in Table 2 thus obtained and the No. 1 shown in Table 1 described above. A cylindrical roller 3 having a configuration of 1 (N content: 0.6% by mass, residual austenite content: 10% by volume, hardness: Hv802, surface roughness (Ra): 0.05 μm) Assembled. And this full roller bearing was subjected to a life test under the same conditions as described above. The results are shown in Table 1. 16 of L 10 life as a ratio when a 1, shown in Table 2.

Figure 2005337362
Figure 2005337362

表２に示すように、内輪１および外輪２を、本発明の構成（軌道面１Ａ，２Ａをなす表層部の残留オーステナイト量，前記表層部の硬さ）としたＮｏ．２１〜３０では、本発明の構成外としたＮｏ．３１，３２と比べて長寿命であり、表１に示すＮｏ．１６の３．４〜７．２倍の寿命が得られた。
このうち、同じ組成の鋼を用いて異なる熱処理を行ったＮｏ．２１とＮｏ．２２の結果から、浸炭窒化を含む熱処理を施したＮｏ．２２のほうが、浸炭を含む熱処理を施したＮｏ．２１よりも長寿命となっていることが分かる。これは、浸炭処理では、軌道面をなす表層部に窒化物が形成されず、摩擦係数の軽減を図ることが出来なかったためである。 As shown in Table 2, the inner ring 1 and the outer ring 2 were No. 1 having the configuration of the present invention (the amount of retained austenite in the surface layer portion forming the raceway surfaces 1A and 2A, the hardness of the surface layer portion). In Nos. 21 to 30, Nos. No. 31 and 32, which have a long life. A lifetime of 3.4 to 7.2 times that of 16 was obtained.
Among these, No. 1 which performed different heat processing using the steel of the same composition. 21 and no. From the results of No. 22, No. 22 subjected to heat treatment including carbonitriding. No. 22 was subjected to heat treatment including carburizing No. 22 It can be seen that the lifetime is longer than 21. This is because in the carburizing process, nitrides are not formed in the surface layer portion forming the raceway surface, and the friction coefficient cannot be reduced.

一方、Ｎｏ．３１では、各軌道面１Ａ，２Ａの表層部の残留オーステナイト量が本発明の範囲（４５体積％以下）よりも多いため、材料に塑性変形が起こり、短寿命であった。
また、Ｎｏ．３２では、各軌道面１Ａ，２Ａの表層部に残留オーステナイト量を存在させることが出来ず、且つ、硬さが本発明の範囲（Ｈｖ６５０以上）よりも小さかったため、耐久性が得られず、短寿命であった。 On the other hand, no. In No. 31, since the amount of retained austenite in the surface layer portion of each of the raceway surfaces 1A and 2A was larger than the range of the present invention (45% by volume or less), the material was plastically deformed and had a short life.
No. In No. 32, the amount of retained austenite cannot be present in the surface layer portions of the raceway surfaces 1A and 2A, and the hardness is smaller than the range of the present invention (Hv650 or more). It was a lifetime.

以上の結果から、本発明の構成（鋼の組成と、転がり面３Ａをなす表層部のＮ含有率，Ｃ含有率，残留オーステナイト量，硬さ）とした円筒ころ３と、本発明の構成（軌道面１Ａ，２Ａをなす表層部の残留オーステナイト量，硬さ）とした内輪１および外輪２を組み合わせることによって、表面損傷が生じ易い環境下で使用しても、総ころ軸受の寿命をさらに長くできることが分かった。
また、円筒ころ３の転がり面３Ａの表面粗さを、内輪１および外輪２の各軌道面１Ａ，２Ａの表面粗さよりも小さくすることで、総ころ軸受の寿命をさらに長くできることが分かった。 From the above results, the cylindrical roller 3 having the configuration of the present invention (the steel composition and the N content, C content, residual austenite amount, hardness of the surface layer portion forming the rolling surface 3A) and the configuration of the present invention ( By combining the inner ring 1 and outer ring 2 with the retained austenite amount and hardness of the surface layer portion forming the raceway surfaces 1A and 2A, the life of the full complement roller bearing is further extended even when used in an environment where surface damage is likely to occur. I understood that I could do it.
Further, it was found that the life of the full roller bearing can be further increased by making the surface roughness of the rolling surface 3A of the cylindrical roller 3 smaller than the surface roughness of the raceway surfaces 1A and 2A of the inner ring 1 and the outer ring 2.

次いで、上述した表１に示すＮｏ．１の構成で作製し、その転がり面３Ａの表面粗さ（Ｒａ）を０．０２μｍに調整した円筒ころ３と、上述した表２に示すＮｏ．３０の内輪１および外輪２とを用いて、総ころ軸受を組み立てた。そして、この総ころ軸受において、上述と同様の条件で寿命試験を行った。
この総ころ軸受は、表２に示すＮｏ．３０（円筒ころ２の転がり面３Ａの表面粗さ（Ｒａ）が０．０５μｍ）よりも長寿命であり、表１に示すＮｏ．１６の８．３倍の寿命が得られた。これにより、円筒ころ３の転がり面３Ａの表面粗さをより小さくすることで、総ころ軸受の寿命をさらに長くできることが分かった。 Then, No. shown in Table 1 mentioned above. No. 1 shown in Table 2 described above and the cylindrical roller 3 manufactured with the configuration of No. 1 and having the surface roughness (Ra) of the rolling surface 3A adjusted to 0.02 μm. A total roller bearing was assembled using 30 inner rings 1 and 2 outer rings. And this full roller bearing was subjected to a life test under the same conditions as described above.
This full complement roller bearing is the No. shown in Table 2. No. 30 (the surface roughness (Ra) of the rolling surface 3A of the cylindrical roller 2 is 0.05 μm). A lifetime of 8.3 times that of 16 was obtained. Thus, it was found that the life of the full roller bearing can be further extended by further reducing the surface roughness of the rolling surface 3A of the cylindrical roller 3.

本発明の総ころ軸受の一例を示す断面図である。It is sectional drawing which shows an example of the full roller bearing of this invention.

符号の説明Explanation of symbols

１ 内輪
１Ａ 内輪軌道面
２ 外輪
２Ａ 外輪軌道面
３ 円筒ころ（ころ）
３Ａ 転がり面
１０，２０ 鍔部 DESCRIPTION OF SYMBOLS 1 Inner ring 1A Inner ring raceway surface 2 Outer ring 2A Outer ring raceway surface 3 Cylindrical roller (roller)
3A Rolling surface 10,20 buttock

Claims (4)

内輪と、外輪と、前記内輪および外輪の間に転動自在に配設された複数のころと、を備え、前記内輪の外周面端部および前記外輪の内周面端部の少なくとも一つに、ころを保持する鍔部が形成されている総ころ軸受において、
前記ころは、Ｃ含有率が０．３０質量％以上１．２０質量％以下、Ｓｉ含有率が０．５０質量％以上２．００質量％以下、Ｍｎ含有率が０．２０質量％以上２．００質量％以下、Ｃｒ含有率が０．５０質量％以上２．００質量％以下、Ｏ含有率が１２ｐｐｍ以下、残部がＦｅおよび不可避不純物である鋼からなる素材を所定形状に加工した後、浸炭窒化処理と、焼入れ処理と、２００℃以上３００℃以下での焼戻し処理とがこの順に施されて得られ、
その転がり面をなす表層部のＮ含有率が０．２質量％以上２．０質量％以下で、前記表層部のＣ含有率が０．６質量％以上２．５質量％以下で、前記表層部の硬さがＨｖ６５０以上で、前記表層部の残留オーステナイト量が０体積％超え２０体積％未満となっていることを特徴とする総ころ軸受。 An inner ring, an outer ring, and a plurality of rollers rotatably disposed between the inner ring and the outer ring, and at least one of an outer peripheral surface end of the inner ring and an inner peripheral surface end of the outer ring In the full roller bearing in which the collar portion that holds the roller is formed,
The roller has a C content of 0.30% by mass or more and 1.20% by mass or less, an Si content of 0.50% by mass or more and 2.00% by mass or less, and a Mn content of 0.20% by mass or more. 00% by mass or less, Cr content of 0.50% by mass or more and 2.00% by mass or less, O content of 12ppm or less, and a material made of steel with the balance being Fe and inevitable impurities, and then carburizing A nitriding treatment, a quenching treatment, and a tempering treatment at 200 ° C. or more and 300 ° C. or less are performed in this order.
The N content of the surface layer part forming the rolling surface is 0.2% by mass or more and 2.0% by mass or less, and the C content of the surface layer part is 0.6% by mass or more and 2.5% by mass or less. A full roller bearing, wherein the hardness of the part is Hv650 or more, and the amount of retained austenite in the surface layer part is more than 0% by volume and less than 20% by volume. 前記ころの転がり面に、クラウニング加工が施されていることを特徴とする請求項１に記載の総ころ軸受。   2. The full roller bearing according to claim 1, wherein the rolling surface of the roller is crowned. 前記ころの転がり面の表面粗さは、前記内輪および外輪の軌道面の表面粗さよりも小さくなっていることを特徴とする請求項１または２に記載の総ころ軸受。   3. The full roller bearing according to claim 1, wherein a surface roughness of a rolling surface of the roller is smaller than a surface roughness of a raceway surface of the inner ring and the outer ring. 前記内輪および外輪の軌道面をなす表層部の硬さがＨｖ６５０以上で、前記表層部の残留オーステナイト量が０体積％超え４５体積％以下となっていることを特徴とする請求項１から３のいずれか一項に記載の総ころ軸受。   The hardness of the surface layer portion forming the raceway surface of the inner ring and the outer ring is Hv650 or more, and the amount of retained austenite of the surface layer portion is more than 0% by volume and 45% by volume or less. A full roller bearing according to any one of the preceding claims.
JP2004156394A 2004-05-26 2004-05-26 Full type roller bearing Pending JP2005337362A (en)

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JP2007162807A (en) * 2005-12-13 2007-06-28 Nsk Ltd Rolling bearing
JP2008056969A (en) * 2006-08-30 2008-03-13 Nsk Ltd Roller bearing
WO2009082107A1 (en) * 2007-12-20 2009-07-02 Posco Steel wire rod for bearing steel, manufacturing method of steel wire rod for bearing steel, heat treatment method of steel bearing, steel bearing and soaking method of bearing steel
KR100940724B1 (en) * 2007-12-20 2010-02-08 주식회사 포스코 Manufacturing method of high carbon steel wire rod for bearing steel, heat treatment method of high carbon steel bearing and high carbon steel bearing
KR101262458B1 (en) 2010-10-20 2013-05-08 주식회사 포스코 Steel for bearing having excellent thermal deformation resistance and method for manufacturing thereof
GB2512838A (en) * 2013-04-08 2014-10-15 Skf Ab Bearing component formed from steel alloy

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JPH08311603A (en) * 1994-09-29 1996-11-26 Nippon Seiko Kk Rolling bearing
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JP2002250338A (en) * 2000-12-22 2002-09-06 Nsk Ltd Thrust bearing device
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007162807A (en) * 2005-12-13 2007-06-28 Nsk Ltd Rolling bearing
JP2008056969A (en) * 2006-08-30 2008-03-13 Nsk Ltd Roller bearing
WO2009082107A1 (en) * 2007-12-20 2009-07-02 Posco Steel wire rod for bearing steel, manufacturing method of steel wire rod for bearing steel, heat treatment method of steel bearing, steel bearing and soaking method of bearing steel
KR100940724B1 (en) * 2007-12-20 2010-02-08 주식회사 포스코 Manufacturing method of high carbon steel wire rod for bearing steel, heat treatment method of high carbon steel bearing and high carbon steel bearing
US9593389B2 (en) 2007-12-20 2017-03-14 Posco Steel wire rod for bearing steel, manufacturing method of steel wire rod for bearing steel, heat treatment method of steel bearing, steel bearing and soaking method of bearing steel
KR101262458B1 (en) 2010-10-20 2013-05-08 주식회사 포스코 Steel for bearing having excellent thermal deformation resistance and method for manufacturing thereof
GB2512838A (en) * 2013-04-08 2014-10-15 Skf Ab Bearing component formed from steel alloy

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