JPH05240253A - Mechanical part having rolling body - Google Patents
Mechanical part having rolling bodyInfo
- Publication number
- JPH05240253A JPH05240253A JP4078888A JP7888892A JPH05240253A JP H05240253 A JPH05240253 A JP H05240253A JP 4078888 A JP4078888 A JP 4078888A JP 7888892 A JP7888892 A JP 7888892A JP H05240253 A JPH05240253 A JP H05240253A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- steel
- surface layer
- gas
- hardened
- 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.)
- Granted
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
- F16C33/32—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
- F16C33/58—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
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
-
- 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
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/66—High carbon steel, i.e. carbon content above 0.8 wt%, e.g. through-hardenable steel
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Rolling Contact Bearings (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、構成部材の材質及び熱
処理によって、寿命を改善した等速自在継手及び転がり
軸受などの機械部品に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical component such as a constant velocity universal joint and a rolling bearing, the life of which is improved by the materials of components and heat treatment.
【０００２】[0002]
【従来の技術】等速自在継手の外輪や、また転がり軸受
の中でハブベアリングの軌道輪は、複雑な形状を有して
いるので、鍛造容易な中炭素含有鋼により熱間鍛造で形
成され、その転走面や摺動面は高周波焼入れ・焼戻しさ
れて形成されている。また転動体は単純形状であって、
焼入れ性よく転動寿命にすぐれた軸受鋼、特に高炭素ク
ロム軸受鋼などにより、一体焼入れ（ずぶ焼入れ）焼戻
しされて使用される。2. Description of the Related Art Since the outer ring of a constant velocity universal joint and the race of a hub bearing in rolling bearings have a complicated shape, they are formed by hot forging from medium carbon containing steel which is easy to forge. The rolling surface and sliding surface are formed by induction hardening and tempering. The rolling element has a simple shape,
The bearing steel, which has good hardenability and excellent rolling life, especially high carbon chrome bearing steel, is used after being integrally hardened (deep quenching) and tempered.
【０００３】高周波焼入れ材としては、鍛造容易な構造
用炭素鋼の他に、ＳｉとＡｌとを総量で０．５〜１．０
％含有させた０．６〜０．８％Ｃの構造用鋼が開発され
て利用され（特開平３−１９９３４０号、特開平１−１
２７６５１号）、これらの鋼種は、材料が安価で、か
つ、鍛造が容易であるから複雑な形状の外輪の成形に適
し、また、局部的な高周波焼入れであるから熱処理中の
変形少なく、且つ内質部は靱性があり、更に高周波焼入
れ焼戻し後の硬化層が耐熱性と耐磨耗性に優れているの
で、転がり疲労寿命の長い特長を有し、外輪及び内輪に
賞用されて来た。As an induction hardened material, in addition to structural carbon steel that is easily forged, Si and Al in a total amount of 0.5 to 1.0.
% Of 0.6 to 0.8% C structural steel has been developed and utilized (Japanese Patent Laid-Open No. 3-199340 and Japanese Patent Laid-Open No. 1-111).
No. 27651), these steel types are suitable for forming an outer ring having a complicated shape because they are inexpensive materials and are easy to forge. Also, since they are local induction hardening, there is little deformation during heat treatment and Since the quality part has toughness and the hardened layer after induction hardening and tempering has excellent heat resistance and wear resistance, it has a long rolling fatigue life and has been favored for outer and inner rings.
【０００４】また、上記の高炭素クロム軸受鋼により形
成して、その表面に浸炭窒化処理を行い、一体焼入れ後
に焼戻しをした転がり部品が提案されており（アメリカ
特許ＵＳＰ３２１６８６９）、また焼入れ後の比較的高
温焼戻しにより、内質部の残留オーステナイト量を極力
低減させ、表層の浸炭層は適量のオーステナイトを残留
させて転動疲労を向上させた熱処理法が知られている
（特開昭６２−２１８５４２号）。Further, a rolling part has been proposed (US Pat. No. 3216869), which is formed of the above high carbon chromium bearing steel, the surface of which is carbonitrided, and integrally tempered and then tempered. There is known a heat treatment method in which the amount of retained austenite in the internal portion is reduced as much as possible and the appropriate amount of austenite is retained in the surface carburized layer to improve rolling fatigue by dynamic high temperature tempering (JP-A-62-218542). issue).
【０００５】[0005]
【発明が解決しようとする課題】一般に、高周波焼入れ
材を軸受の軌道輪や等速自在継手の外包部材に使用した
場合は、これら外包部材の寿命は、高炭素クロム軸受鋼
一体焼入れのボール転動体の寿命より短かった。しかる
に、上述のような寿命の長い高周波焼入れ材の外包部材
外輪が出現するに伴い、また、自動車用の軸受や等速自
在継手に小型化・軽量化が要求されるに伴い、転走面等
の高面圧下での使用条件で、相対的に軸受鋼による一体
焼入れ転動体の疲労寿命に不満を生じることとなった。Generally, when induction hardening materials are used for bearing rings of bearings and outer casing members of constant velocity universal joints, the life of these outer casing members is high. It was shorter than the life of the moving body. However, with the advent of outer ring outer casings of induction hardened materials with long life as described above, and with the demand for smaller and lighter bearings and constant velocity universal joints for automobiles, rolling surfaces, etc. Under the conditions of use under high surface pressure, the fatigue life of the integrally quenched rolling element made of bearing steel was relatively unsatisfactory.
【０００６】高面圧下での使用条件では、転動体の疲労
寿命は、高周波焼入れ材の焼入れ硬化した転走面又は摺
動面の磨耗によって発生する磨耗粉によって、転動体の
表面が剥離して生じるのである。転動体の剥離は、特
に、等速自在継手のように、転動体と外輪等の摺動面に
転がり運動とともにすべり運動が関与する場合に大き
い。Under the condition of use under high surface pressure, the fatigue life of the rolling element is such that the surface of the rolling element peels off due to the abrasion powder generated by the abrasion of the quenching-hardened rolling surface or sliding surface of the induction hardened material. It happens. The separation of the rolling elements is particularly great when a sliding motion as well as a rolling motion is involved in the sliding surfaces of the rolling members and the outer ring, as in a constant velocity universal joint.
【０００７】また、外包部材に上記の高炭素鋼の浸炭窒
化処理品を使用するのは、複雑な形状に鍛造するのが困
難であって、切削加工に頼らざるを得ず、量産性に欠
け、製造コストが高価となり、実用的ではなかった。Further, it is difficult to forge into a complicated shape for using the above-mentioned carbonitrided product of high carbon steel for the outer packaging member, and it is necessary to rely on cutting work, and mass productivity is lacking. However, the manufacturing cost was high and it was not practical.
【０００８】本発明は以上の問題を解決すべく、内輪、
特に外輪の長寿命化に対応した転動体の剥離による寿命
限界を改善して、寿命が長く信頼性が高い、且つ量産性
に優れた軸伝動部材や軸受などの機械部品を提供しよう
とするものである。In order to solve the above problems, the present invention provides an inner ring,
In particular, to improve the life limit due to peeling of rolling elements corresponding to the extension of the life of the outer ring, and to provide mechanical components such as shaft transmission members and bearings that have long life, high reliability, and excellent mass productivity. Is.
【０００９】[0009]
【課題を解決するための手段】本発明の機械部品は、内
面に転走面若しくは摺動面を具備した外包部材と、外面
に転走面若しくは摺動面を具備した内包部材と、当該外
包部材と内包部材との転走面若しくは摺動面の間に介装
された転動体と、から成るものであるが、当該外包部材
の当該転走面若しくは摺動面に高周波焼入れによる硬化
層を有する構造用中炭素高周波焼入れ用鋼により形成さ
れ、当該転動体は、その外周表面に浸炭窒化された表層
部を有して、且つ焼入れ焼戻しされた高炭素クロム軸受
鋼によって形成されたことを特徴とするものである。こ
のような機械部品には、等速自在継手や転がり軸受があ
る。A machine part of the present invention comprises an outer packaging member having a rolling surface or a sliding surface on the inner surface, an inner packaging member having a rolling surface or a sliding surface on the outer surface, and the outer packaging member. A rolling element interposed between the rolling surface or the sliding surface of the member and the inner packaging member, and a hardened layer by induction hardening on the rolling surface or the sliding surface of the outer packaging member. It is formed of a structural medium carbon induction hardening steel having, the rolling element has a carbonitrided surface layer portion on its outer peripheral surface, and is formed by quenching and tempering high carbon chromium bearing steel. It is what Such mechanical parts include constant velocity universal joints and rolling bearings.
【００１０】また、本発明は、当該転動体の表層部が、
窒素ガス若しくはＮＸガスと炭化水素ガスとアンモニア
ガスとの混合ガス中の浸炭窒化による硬化表層部である
上記の機械部品が包含される。更に、上記外包部材の構
造用中炭素高周波焼入れ用鋼は、Ｃを０．４５〜０．８
５％含有する炭素鋼、例えば、Ｓ５３Ｃ鋼の他に、少な
くとも、Ｃを０．５０〜０．７０％と、Ｓｉを単独で若
しくはＡｌを単独で、又はＳｉ及びＡｌの総量を０．５
〜１．０％とを含有して成る鋼が含まれる。更に、Ｍｎ
とＣｒをそれぞれ１．５％以下含有されていても良い。According to the present invention, the surface layer of the rolling element is
The above-mentioned mechanical parts which are the surface layer portion hardened by carbonitriding in a mixed gas of nitrogen gas or NX gas, hydrocarbon gas and ammonia gas are included. Further, the structural medium carbon induction hardening steel of the outer casing member has a C content of 0.45 to 0.8.
Carbon steel containing 5%, for example, S53C steel, at least C of 0.50 to 0.70%, Si alone or Al alone, or the total amount of Si and Al is 0.5.
~ 1.0% is included. Furthermore, Mn
And Cr may be contained in an amount of 1.5% or less, respectively.
【００１１】[0011]
【作用】外包部材は、中炭素の高周波焼入れ鋼で形成さ
れ、その転動・摺動面が高周波焼入れ後の焼戻しをされ
ているから、未焼入れの内質部が耐衝撃特性の良いほぼ
軟質とされているの対して、転動面等の焼入れ硬化した
表層部には高周波焼入れの際の変態に伴う圧縮応力が残
留しているから、表層部における亀裂の大きな剥離への
進展が遅く、疲労寿命が長い。[Function] The outer envelope member is made of medium carbon induction hardened steel and its rolling and sliding surfaces are tempered after induction hardening, so the unquenched inner part is almost soft with good impact resistance. On the other hand, since the compressive stress due to the transformation during induction hardening remains in the quench-hardened surface layer portion such as the rolling surface, the progress of large crack separation in the surface layer portion is slow, Long fatigue life.
【００１２】特に、当該中炭素高周波焼入れ用鋼がＳｉ
を単独で、若しくはＡｌを単独で又はＳｉとＡｌとを総
和で０．５〜１．０％、Ｃを０．５０〜０．７０％含有
する鋼であるときは、ＡｌとＳｉの耐焼戻し抵抗を利用
して、焼戻し硬度を低下させずに、焼戻し温度を高くし
て残留オーステナイトを１５％以下の適量に調整して、
耐磨耗性と共に転がり疲労寿命が向上する。In particular, the medium carbon induction hardening steel is Si
, Or Al alone or Si and Al in a total content of 0.5 to 1.0% and C of 0.50 to 0.70%, in the case of steel, tempering resistance of Al and Si Using the resistance, the tempering temperature is raised and the retained austenite is adjusted to an appropriate amount of 15% or less without lowering the tempering hardness.
Not only wear resistance but also rolling fatigue life is improved.
【００１３】他方、転動体の高炭素クロム軸受鋼は、浸
炭窒化焼入れすると、転動体表層部の炭素・窒素濃化層
のＭｓ点が低下して、オーステナイト化後の焼入れ過程
で、浸炭窒化表層部のマルテンサイト変態が内部よりも
遅れるので、変態後の表層部に圧縮応力が発生し、残留
オーステナイト量が増加し、且つ表層部のマトリックス
の硬度が上昇して、耐磨耗性と疲労強度が向上する。On the other hand, the high carbon chrome bearing steel of the rolling element is carbonitrided and quenched, the Ms point of the carbon / nitrogen-enriched layer of the rolling element surface portion is lowered, and in the quenching process after austenitizing, the carbonitrided surface layer Since the martensitic transformation of the part is delayed compared to the inside, compressive stress occurs in the surface layer after transformation, the amount of retained austenite increases, and the hardness of the matrix of the surface layer increases, resulting in wear resistance and fatigue strength. Is improved.
【００１４】浸炭窒化焼入れされた転動体が、外輪又は
内輪の転走面の磨耗により発生する磨耗粉のかみ込みに
対して、転動体表面の剥離が遅延して、寿命が長くなる
ので、転がり軸受全体として、あるいは自在継手全体と
しての寿命が長くなり、長寿命に伴う信頼性が向上す
る。The carbonitrided and hardened rolling element is delayed in peeling of the rolling element surface due to the inclusion of wear powder generated by the abrasion of the rolling surface of the outer ring or the inner ring, and the life of the rolling element is extended. The life of the bearing as a whole or the universal joint as a whole is extended, and the reliability associated with the long life is improved.
【００１５】当該転動体の表層部は、窒素ガス若しくは
ＮＸガスと炭化水素ガスとアンモニアガスとの混合ガス
中の浸炭窒化による場合、浸窒量が大きく、焼入れによ
る硬化が大きいので、耐磨耗性と疲労強度が向上する。
又、従来の浸炭用ＲＸガスに窒化剤アンモニアガスを混
合した雰囲気には水素ガスを多量に含有するが、ＮＸガ
スを基礎とするから、転動体の使用過程での水素脆性の
懸念が少なくなる。When the surface layer of the rolling element is carbonitrided in a mixed gas of nitrogen gas or NX gas, hydrocarbon gas and ammonia gas, the amount of nitriding is large and the hardening by quenching is large, so that the wear resistance is high. And fatigue strength are improved.
Further, a large amount of hydrogen gas is contained in the atmosphere in which the conventional carburizing RX gas is mixed with the nitriding agent ammonia gas, but since it is based on NX gas, there is less concern about hydrogen embrittlement during the use process of rolling elements. ..
【００１６】[0016]
【実施例】本発明の実施例を、まず、図面に基づき、説
明する。Embodiments of the present invention will be described first with reference to the drawings.
【００１７】図１（Ａ）は、一例として、自動車に使用
される車軸用軸受の断面図を示しているが、外包部材で
ある軸受外輪７には、外側に一体にフランジ５が取着さ
れており、フランジ５には、フランジ固定用ボルトが挿
通固定されるボルト孔５１が設けられている。外輪７の
内面には、転動体であるボール８，８が転走する転走面
６、６を有する転走溝が２列周設されている。FIG. 1 (A) shows, as an example, a sectional view of a bearing for an axle used in an automobile. A flange 5 is integrally attached to the outside of a bearing outer ring 7 which is an outer envelope member. The flange 5 is provided with a bolt hole 51 through which a flange fixing bolt is inserted and fixed. Two rows of rolling grooves are provided on the inner surface of the outer ring 7, the rolling grooves having rolling surfaces 6, 6 on which balls 8 which are rolling elements roll.
【００１８】内包部材である内輪２は、それぞれ一端に
拡径部２１に上記ボール８が転走する転走面１を有する
一対の内輪２ａ，２ｂから成り、その他端面が互いに突
接されて、且つ、転走面１，１がボール８，８に摺接し
て、外輪７の中空部内に装入されて、外輪７内に回転自
在に保持されている。The inner ring 2 which is an inner packaging member is composed of a pair of inner rings 2a and 2b each having a rolling surface 1 on the enlarged diameter portion 21 on which the ball 8 rolls at one end, and the other end surfaces are abutted against each other. Moreover, the rolling surfaces 1, 1 are in sliding contact with the balls 8, 8 and are inserted into the hollow portion of the outer ring 7 to be rotatably held in the outer ring 7.
【００１９】外輪７は、構造用炭素鋼Ｓ５３ＣやＡｌ又
はＳｉを添加した０．５０〜０．７０％Ｃ鋼により、熱
間鍛造により一体に成形され、内周面の転走面６，６と
その周辺部にのみ、高周波焼入れとその後の焼戻しによ
る硬化層６１が形成されている。また、内輪２は、比較
的円筒状に近い形状であるから、高炭素クロム軸受鋼Ｓ
ＵＪ２鋼から形成され、一体焼入れ（ずぶ焼入れ）後の
焼戻しがされている。ボール８は、ＳＵＪ２鋼で形成さ
れ、ガス浸炭窒化処理して後一体焼入れ（ずぶ焼入れ）
・焼戻しが施されている。The outer ring 7 is integrally formed by hot forging from structural carbon steel S53C or 0.50 to 0.70% C steel to which Al or Si is added, and the inner raceway rolling surfaces 6 and 6 are formed. A hardened layer 61 formed by induction hardening and subsequent tempering is formed only in the peripheral portion. Further, since the inner ring 2 has a shape relatively close to a cylindrical shape, the high carbon chromium bearing steel S
It is made of UJ2 steel and is tempered after integral hardening (soaking). The ball 8 is made of SUJ2 steel, and is subjected to gas carbonitriding, followed by integral quenching (deep quenching).
-Tempered.
【００２０】図１（Ｂ）は、固定型ボールジョイントの
実施例で、外包部材である外輪７はマウス部７ａの内周
面に転走面６を有する数条の転走溝が軸方向に沿って半
径方向に湾曲するように刻設され、マウス部７ａの端部
に一体に突設された軸のステム部７ｂには外周にセレー
ション７１が転造されている。外輪７は、構造用炭素鋼
Ｓ５３ＣやＡｌ又はＳｉを添加した０．５０〜０．７０
％Ｃ鋼により、熱間鍛造により一体に成形され、マウス
部７ａの内周面は、転走面６を含めて、高周波焼入れと
その後の焼戻しによる硬化層６１が形成されている。FIG. 1B shows an embodiment of a fixed type ball joint, in which the outer ring 7 which is an outer envelope member has several rolling grooves having a rolling surface 6 on the inner peripheral surface of the mouth portion 7a in the axial direction. A serration 71 is rolled on the outer periphery of the stem portion 7b of the shaft which is formed so as to be curved along the radial direction and which is integrally projected on the end portion of the mouth portion 7a. The outer ring 7 is 0.50 to 0.70 to which structural carbon steel S53C or Al or Si is added.
% C steel is integrally formed by hot forging, and a hardened layer 61 is formed on the inner peripheral surface of the mouth portion 7a including the rolling surface 6 by induction hardening and subsequent tempering.
【００２１】外輪７のマウス部７ａ内に、外周に転走溝
に嵌まる転動体のボール８を介して保持された内包部材
の内輪２は、浸炭焼入れ後の焼戻しがされたＳＣｒ４１
５鋼から形成されて、少なくとも転走溝内の転走面１が
硬化されている。当該ボール８は、ガス浸炭窒化処理し
て後焼入れ焼戻しが施されたＳＵＪ２鋼で形成されてい
る。The inner ring 2 of the inner inclusion member held in the mouth portion 7a of the outer ring 7 through balls 8 of rolling elements fitted in the rolling groove on the outer periphery of the inner ring 2 is SCr41 which is tempered after carburizing and quenching.
5 steel, and at least the rolling surface 1 in the rolling groove is hardened. The ball 8 is made of SUJ2 steel that has been subjected to gas carbonitriding and post-quenching and tempering.
【００２２】次に、このような外包部材を形成する高周
波焼入れ用鋼の寿命試験を示す。高周波焼入れ用鋼とし
ては、炭素鋼Ｓ５３Ｃと、Ｓｉ添加炭素鋼（ＮＫＪ６
５、組成０．６５％Ｃ、０．８０％Ｓｉ、１．１０％Ｍ
ｎ、０．０１５％Ｐ、０．０１０％Ｓ、０．０３０％Ａ
ｌ、０．２０％Ｃｒ）であって精密研摩代を残して、円
筒状に施削加工し、常用の外周面の高周波焼入れと焼戻
しを行い、直径１２ｍｍ、長さ２２ｍｍの円筒試片に仕
上げた。Next, a life test of the induction hardening steel forming such an outer casing member will be shown. As the steel for induction hardening, carbon steel S53C and Si-added carbon steel (NKJ6
5, composition 0.65% C, 0.80% Si, 1.10% M
n, 0.015% P, 0.010% S, 0.030% A
L, 0.20% Cr), leaving a precision polishing allowance, machined into a cylindrical shape, induction hardening and tempering the usual outer peripheral surface, and finishing into a cylindrical specimen with a diameter of 12 mm and a length of 22 mm. It was
【００２３】比較例として、高炭素クロム軸受鋼ＳＵＪ
２鋼を一体焼入れ、焼戻しして、同様の円筒試片に仕上
げた。As a comparative example, high carbon chromium bearing steel SUJ
The two steels were integrally quenched and tempered to obtain the same cylindrical test piece.
【００２４】次に、この円筒試片を用いて、円筒型転動
疲労寿命試験機（エヌティエヌ（株）製）を用いて、ヘ
ルツ最大接触応力６００ｋｇｆ／ｍｍ2 の荷重下で回転
速度２３１２０ｒｐｍにより寿命試験を行った。その結
果を表１に示す。Next, using this cylindrical test piece, using a cylindrical type rolling fatigue life tester (manufactured by NTN Corporation), the life was measured at a rotation speed of 23120 rpm under a load of Hertz maximum contact stress of 600 kgf / mm 2. The test was conducted. The results are shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１の結果より、ＮＫＪ６５の高周波焼入
れ品がＳＵＪ２の一体焼入れ品よりすぐれた寿命を表し
ているのが判る。From the results shown in Table 1, it can be seen that the induction hardened product of NKJ65 exhibits a longer life than the integrally hardened product of SUJ2.
【００２７】次に、上述の車軸用軸受を想定して、外輪
に中炭素鋼（Ｓ５３Ｃと上記組成のＮＫＪ６５）の高周
波焼入れ品を、内輪に高炭素クロム軸受鋼ＳＵＪ２鋼の
焼入れ焼戻し品を、また転動体として高炭素クロム軸受
鋼のボールの浸炭窒化焼入れ品を使用して、軸受の転が
り寿命試験を行った。Next, assuming the above-mentioned axle bearing, the outer ring is an induction-hardened product of medium carbon steel (S53C and NKJ65 of the above composition), and the inner ring is a quenched and tempered product of high-carbon chromium bearing steel SUJ2 steel. In addition, rolling carbon bearing carbonitriding hardened products of high carbon chromium bearing steel were used as rolling elements, and rolling life tests of the bearings were conducted.
【００２８】ボールの浸炭窒化は、光輝焼入れ炉によ
り、光輝焼入れ用のＲＸガスを容積比で１００部に対し
て、プロパンガス１部とアンモニアガス１０部を加えた
雰囲気中で８５０℃×１．５ｈ加熱した後、油中焼入れ
をした。焼戻しは１７０℃×２ｈで行った。The carbonitriding of the balls was carried out in a bright quenching furnace in an atmosphere in which 1 part of propane gas and 10 parts of ammonia gas were added to 850 ° C. × 1. After heating for 5 hours, it was quenched in oil. Tempering was performed at 170 ° C. for 2 hours.
【００２９】比較例として、外輪に高炭素クロム鋼ＳＵ
Ｊ２の焼入れ及びボールに同じくＳＵＪ２鋼の焼入れを
したものの寿命試練を行った。その結果を表２に示し
た。As a comparative example, a high carbon chrome steel SU is used for the outer ring.
A life test was performed on the J2 quenched steel and the ball, which was also quenched from SUJ2 steel. The results are shown in Table 2.
【００３０】寿命試験条件は、試験軸受６２０６、軸受
荷重７００ｋｇｆ、回転数２０００ｒｐｍ、潤滑はター
ビン５６油の循環給油であった。The life test conditions were a test bearing 6206, a bearing load of 700 kgf, a rotation speed of 2000 rpm, and lubrication was circulation of 56 turbine oil.
【００３１】[0031]
【表２】 [Table 2]
【００３２】表２から、寿命試験により破損した軸受に
おいて、ボール自体に表面剥離を有する頻度は、中炭素
鋼の外輪と、高炭素クロム鋼の一体焼入れのボールとの
従来の組み合わせよりも、高炭素クロム鋼の浸炭窒化焼
入れのボールとの組み合わせの方が小さくなっており、
外輪・ボールとも一体焼入れをした場合と同程度であっ
て、しかも寿命は延びていることが判る。From Table 2, in the bearing damaged by the life test, the frequency of surface peeling on the balls themselves is higher than that of the conventional combination of the outer ring made of medium carbon steel and the integrally hardened balls made of high carbon chromium steel. The combination with carbon-carbon steel carbonitriding and quenching balls is smaller,
It can be seen that both the outer ring and the balls are about the same as when integrally hardened, and the life is extended.
【００３３】外輪を中炭素鋼の高周波焼入れ品とし、転
動体のボールを高炭素クロム鋼ＳＵＪ２の浸炭窒化焼入
れ品とした等速自在継手の実施例を次に示す。An example of a constant velocity universal joint in which the outer ring is a medium carbon steel induction hardened product and the balls of the rolling elements are carbonitrided and hardened products of a high carbon chromium steel SUJ2 will be described below.
【００３４】転動体は、直径１６．６６９ｍｍの鋼球
で、光輝焼入れ炉を利用して、搬送ガスとしてＲＸガス
とＮＸガスを選び、常温１気圧下容積比で、この搬送ガ
スに１００部に対して浸炭剤としてのブタンガス１部と
窒化剤としてアンモニアガス１０部を混合した雰囲気中
で８５０℃×２ｈの浸炭窒化処理を行い油冷後、１７０
℃×２ｈで焼戻しを行った。The rolling element is a steel ball with a diameter of 16.669 mm. Using a bright quenching furnace, RX gas and NX gas are selected as carrier gases, and 100 parts of this carrier gas are added at a volume ratio of 1 atm at room temperature. On the other hand, in an atmosphere in which 1 part of butane gas as a carburizing agent and 10 parts of ammonia gas as a nitriding agent are mixed, carbonitriding treatment is performed at 850 ° C. for 2 hours, and after oil cooling, 170
Tempering was performed at ℃ × 2h.
【００３５】図２は、浸炭窒化焼入れ後焼戻しの処理を
した鋼球断面における表面から内質部に亘ってマイクロ
ヴィカース硬度試験機により測定した硬度分布曲線を示
している。浸炭窒化処理を行えば、表層が内質部より若
干硬化するが、ＮＸガスを基礎とした雰囲気の処理の方
（図中ａ曲線）が、ＲＸガスのものより（図中ｂ曲
線）、表層部の硬度が高く、ロックウェルＣ硬度に換算
してＨRC１〜２程度上昇する。FIG. 2 shows a hardness distribution curve measured by a Micro-Vickers hardness tester from the surface to the internal portion of the steel ball cross section which has been subjected to carbonitriding and quenching and then tempering. When carbonitriding is performed, the surface layer is slightly hardened from the internal part, but the treatment in an atmosphere based on NX gas (curve a in the figure) is better than that of RX gas (curve b in the figure) hardness parts is high, in terms of Rockwell C hardness rises about H RC 1 to 2.
【００３６】図３は、当該熱処理の鋼球の断面の表面近
傍の顕微鏡写真であるが、ＮＸガスを基礎とした雰囲気
で浸炭窒化した鋼球の表層に微細な炭化物が認められる
（同図（Ａ））。この微細な炭化物が耐磨耗性の向上に
寄与していると考えられる。FIG. 3 is a photomicrograph of the vicinity of the surface of the cross section of the steel ball of the heat treatment, in which fine carbides are recognized in the surface layer of the carbon ball carbonitrided in an atmosphere based on NX gas (see FIG. A)). It is considered that this fine carbide contributes to the improvement of wear resistance.
【００３７】図４は、図２に示したような低温焼戻しの
後、さらに５００℃１ｈの高温焼戻しを行った鋼球の硬
度分布を示している。この高温焼戻しによって、内質部
はＨｖ５００以下に軟化するが、表層部は、なおＨｖ６
００以上の硬度を有しており、このことは使用中の摩擦
による転走面の発熱があっても軟化し難いことを示しし
ているが、この表層の硬さは表面より浸透した窒素によ
り硬化しているものである。さらに、図４において、Ｎ
Ｘガスを基礎にして浸炭窒化処理した鋼球の表面の硬化
層の硬さ（図中ａ曲線）がＲＸガスを基礎にして浸炭窒
化処理した鋼球の硬さ（図中ｂ曲線）より大きく、この
硬度差は表層部の窒素量の差に起因するものと考えられ
る。FIG. 4 shows the hardness distribution of the steel balls which have been subjected to the high temperature tempering of 500 ° C. for 1 h after the low temperature tempering as shown in FIG. By this high temperature tempering, the internal part is softened to Hv500 or less, but the surface part is still Hv6.
It has a hardness of 00 or more, which means that it is difficult to soften even if the rolling surface generates heat due to friction during use, but the hardness of this surface layer depends on the nitrogen that has penetrated from the surface. It is hardened. Further, in FIG.
The hardness of the hardened layer on the surface of the carbon balls carbonitrided on the basis of X gas (curve a in the figure) is larger than the hardness of the steel balls carbonitrided on the basis of RX gas (curve b in the figure). It is considered that this hardness difference is due to the difference in the nitrogen content in the surface layer.
【００３８】次に、等速自在継手の寿命試験を行った。
継手は図１（Ｂ）に示したような固定型ボールジョイン
トであって、外輪は、Ｓ５３Ｃ鋼及び上記ＮＫＪ６５鋼
の鍛造品をマウス部内周面に高周波加熱焼入れしたもの
である。内輪は従来と同じく、ＳＣｒ４１５鋼の浸炭焼
入れ品である。Next, a life test of the constant velocity universal joint was conducted.
The joint is a fixed ball joint as shown in FIG. 1 (B), and the outer ring is a forged product of S53C steel and the above NKJ65 steel, which is induction-heated and quenched on the inner peripheral surface of the mouse portion. The inner ring is a carburized and quenched product of SCr415 steel as in the conventional case.
【００３９】転動体としてのボールは、ＳＵＪ２鋼の浸
炭窒化焼入れ処理を行ったもので、浸炭窒化の際の炉内
雰囲気ガスは上述の実施例に示したように、搬送ガスに
ＲＸガスを利用したものと、ＮＸガスを使用したものと
があり、いずれもプロパンガスとアンモニアガスを混合
して形成したもので、熱処理条件は上記実施例と同じで
ある。また比較例は、従来のＳＵＪ２鋼の一体焼入れ品
のボールを利用したボールジョイントである。The balls as rolling elements are carbonized and quenched by quenching SUJ2 steel, and the atmosphere gas in the furnace at the time of carbonitriding uses RX gas as the carrier gas as shown in the above-mentioned embodiment. The heat treatment conditions are the same as those in the above-mentioned embodiment. Further, the comparative example is a ball joint using balls of the conventional integrally hardened SUJ2 steel.
【００４０】固定型ボールジョイントの寿命試験は、作
動角６°、負荷トルク２１ｋｇｆ−ｍ、回転数１７００
ｒｐｍの条件下で行った。The life test of the fixed type ball joint was carried out at an operating angle of 6 °, a load torque of 21 kgf-m, and a rotation speed of 1700.
It was carried out under the conditions of rpm.
【００４１】試験結果を表３に示したが、同じく外輪に
高周波焼入れ品を使用した場合に、浸炭窒化焼入れされ
たボールが、従来の一体焼入れのボールに対して、継手
の寿命改善に有効である。また浸炭窒化焼入れ雰囲気が
ＲＸガスを基礎とするものより、ＮＸガスを基礎とする
浸炭窒化処理品が、転がり寿命に優れていることが判
る。The test results are shown in Table 3. Similarly, when induction hardening is used for the outer ring, the carbonitrided and hardened ball is more effective in improving the life of the joint than the conventional integrally hardened ball. is there. Further, it can be seen that the carbonitriding-treated product based on NX gas is superior in rolling life to the carbonitriding and quenching atmosphere based on RX gas.
【００４２】[0042]
【表３】 [Table 3]
【００４３】本実施例では、浸炭窒化性ガスとして、Ｎ
Ｘガスを基礎とする混合ガスを示したが、これに代え
て、窒素ガスに炭化水素ガスとアンモニアガスとを混合
したガスであってもよい。In this embodiment, N is used as the carbonitriding gas.
Although the mixed gas based on the X gas is shown, a gas in which a hydrocarbon gas and an ammonia gas are mixed with nitrogen gas may be used instead of the mixed gas.
【００４４】[0044]
【発明の効果】本発明の転がり軸受及び等速継手を含む
機械部品は、外包部材が中炭素焼入れ用鋼で形成されて
成形性に富むので、複雑な形状の外包部材とすることが
できる。転走面・摺動面を含む内面を当該中炭素鋼の高
周波焼入れ硬化層とするので、転動体の転走・摺動に対
しての耐磨耗性において転動体よりやや劣るが耐剥離強
度においてすぐれている。他方、転動体は、高炭素クロ
ム鋼で形成され、その外周面には浸炭窒化焼入れによる
硬化表層を有しているから、一体焼入れ硬化体よりも耐
磨耗性と転動疲労にすぐれており、従って上記継手又は
軸受の全体として、疲労寿命が長くなる。The machine part including the rolling bearing and the constant velocity joint of the present invention has a complicated shape because the outer casing member is made of medium carbon quenching steel and has excellent formability. Since the inner surface including the rolling and sliding surfaces is the induction hardening layer of the medium carbon steel, the abrasion resistance against rolling and sliding of rolling elements is slightly inferior to rolling elements, but peel resistance Is excellent in. On the other hand, the rolling element is made of high carbon chrome steel and has a hardened surface layer by carbonitriding quenching on its outer peripheral surface, so it has better wear resistance and rolling fatigue than the integrally hardened material. Therefore, the fatigue life of the joint or the bearing as a whole is extended.
【００４５】外包部材は、複雑形状であっても成形性及
び高周波加熱による熱処理を容易にすることができ、ま
た単純形状の転動体は、浸炭窒化処理に適しており、内
包部材に適当な材質を選択すれば、軸受又は継手の軽量
化が容易であり、成形・熱処理のコスト高を招くことな
く、量産化に適している。Even if the outer packaging member has a complicated shape, it can be easily molded and heat-treated by high-frequency heating, and the rolling element having a simple shape is suitable for carbonitriding treatment, and is made of a suitable material for the inner packaging member. If is selected, it is easy to reduce the weight of the bearing or the joint, and it is suitable for mass production without incurring the high cost of molding and heat treatment.
【００４６】また、転動体の浸炭窒化処理の雰囲気ガス
に、ＮＸガス又は窒素ガスを搬送ガスとし、浸炭性の炭
化水素及び窒化性のアンモニアガスを混合することによ
って、転動体表面の耐磨耗性、転がり疲労寿命を改善す
ることができる。Further, by using NX gas or nitrogen gas as a carrier gas and mixing a carburizing hydrocarbon and a nitriding ammonia gas as an atmosphere gas for the carbonitriding treatment of the rolling elements, the abrasion resistance of the rolling element surface is improved. And rolling fatigue life can be improved.
【図１】自動車に使用される車軸用軸受（Ａ）と固定型
ボールジョイント（Ｂ）の断面図。FIG. 1 is a sectional view of an axle bearing (A) and a fixed ball joint (B) used in an automobile.
【図２】浸炭窒化焼入れした後焼戻しを行った鋼球の断
面における表層部のヴイッカース硬度分布を示す図。FIG. 2 is a view showing a Vickers hardness distribution of a surface layer portion in a cross section of a steel ball that has been carbonitrided and then tempered.
【図３】浸炭窒化焼入れした後焼戻しを行った鋼球の断
面における金属組織の顕微鏡写真（Ａ，Ｂ）（倍率；４
００、腐食液；ピクリン酸アルコール液）FIG. 3 is a photomicrograph (A, B) of the metal structure of a cross section of a steel ball that has been tempered after carbonitriding and quenching (magnification: 4
00, corrosive liquid; picric acid alcohol liquid)
【図４】浸炭窒化焼入れ低温焼戻して、更に５００℃１
ｈの高温焼戻しをした鋼球の断面における表層部のヴイ
ッカース硬度分布を示す図。[Fig. 4] Carbonitriding quenching, low temperature tempering, 500 ° C 1
The figure which shows the Vickers hardness distribution of the surface layer part in the cross section of the high temperature tempered steel ball of h.
１ 内包部材の転走面 ２ 内包部材 ４ 保持器 ５ フランジ ６ 外装部材の転走面 ６１ 高周波焼入れ硬化層 ７ 外装部材 ８ ボール DESCRIPTION OF SYMBOLS 1 Rolling surface of inclusion member 2 Encapsulation member 4 Cage 5 Flange 6 Rolling surface of exterior member 61 Induction hardening layer 7 Exterior member 8 Ball
Claims (4)
外包部材と、外面に転走面若しくは摺動面を具備した内
包部材と、当該外包部材と内包部材との転走面若しくは
摺動面の間に介装された転動体と、から成る機械部品に
おいて当該外包部材は、当該転走面若しくは摺動面に高
周波焼入れによる硬化層を有する構造用中炭素高周波焼
入れ用鋼により形成され、 当該転動体は、その外周表面に浸炭窒化された表層部を
有して、且つ焼入れ焼戻しされた高炭素クロム軸受鋼に
よって形成されたことを特徴とする機械部品。1. An outer packaging member having a rolling surface or a sliding surface on an inner surface, an inner packaging member having a rolling surface or a sliding surface on an outer surface, and a rolling surface or a slide of the outer packaging member and the inner packaging member. In a mechanical component including a rolling element interposed between moving surfaces, the outer casing member is made of structural medium carbon induction hardening steel having a hardened layer by induction hardening on the rolling surface or sliding surface. The rolling element has a carbonitrided surface layer portion on its outer peripheral surface and is formed by quenching and tempering high carbon chromium bearing steel.
はＮＸガスと炭化水素ガスとアンモニアガスとの混合ガ
ス中の浸炭窒化による硬化表層部である請求項１記載の
機械部品。2. The machine part according to claim 1, wherein the surface layer portion of the rolling element is a surface layer portion hardened by carbonitriding in a mixed gas of nitrogen gas or NX gas, hydrocarbon gas and ammonia gas.
がり軸受である請求項１記載の機械部品。3. The machine part according to claim 1, wherein the machine part is a constant velocity universal joint or a rolling bearing.
れ用鋼が、少なくとも、Ｃを０．５０〜０．７０％と、
Ｓｉを単独で若しくはＡｌを単独で又はＳｉ及びＡｌの
総量を０．５〜１．０％と、を含有して成る鋼である請
求項１記載の機械部品。4. The structural medium carbon induction hardening steel of the outer casing member has at least C of 0.50 to 0.70%,
The machine component according to claim 1, which is a steel containing Si alone, Al alone, or a total amount of Si and Al of 0.5 to 1.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4078888A JP3047088B2 (en) | 1992-02-28 | 1992-02-28 | Machine parts having rolling elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4078888A JP3047088B2 (en) | 1992-02-28 | 1992-02-28 | Machine parts having rolling elements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05240253A true JPH05240253A (en) | 1993-09-17 |
| JP3047088B2 JP3047088B2 (en) | 2000-05-29 |
Family
ID=13674353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4078888A Expired - Lifetime JP3047088B2 (en) | 1992-02-28 | 1992-02-28 | Machine parts having rolling elements |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3047088B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001208079A (en) * | 2000-01-20 | 2001-08-03 | Koyo Seiko Co Ltd | Rolling bearing |
| JP2002213137A (en) * | 2001-01-22 | 2002-07-31 | Tashiko:Kk | Hanger roller unit |
| JP2009523580A (en) * | 2006-01-18 | 2009-06-25 | スミス アンド ネフュー インコーポレーテッド | Application of diffusion hardening technology |
| JP2010014473A (en) * | 2008-07-02 | 2010-01-21 | Ntn Corp | Detection method of detecting temporal change generated when contact fatigue damage is generated |
| JP2010014474A (en) * | 2008-07-02 | 2010-01-21 | Ntn Corp | Detection method for detecting state of occurrence of contact fatigue damage on fixed type constant velocity universal joint |
| US7685717B2 (en) | 2002-05-14 | 2010-03-30 | Jtekt Corporation | Method for manufacturing a bearing raceway member |
| WO2011122632A1 (en) * | 2010-03-29 | 2011-10-06 | Ntn株式会社 | Bearing part, bearing and bearing part inspection method |
| WO2014125952A1 (en) * | 2013-02-13 | 2014-08-21 | Ntn株式会社 | Bearing components and rolling bearing |
-
1992
- 1992-02-28 JP JP4078888A patent/JP3047088B2/en not_active Expired - Lifetime
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001208079A (en) * | 2000-01-20 | 2001-08-03 | Koyo Seiko Co Ltd | Rolling bearing |
| JP2002213137A (en) * | 2001-01-22 | 2002-07-31 | Tashiko:Kk | Hanger roller unit |
| US7685717B2 (en) | 2002-05-14 | 2010-03-30 | Jtekt Corporation | Method for manufacturing a bearing raceway member |
| JP2009523580A (en) * | 2006-01-18 | 2009-06-25 | スミス アンド ネフュー インコーポレーテッド | Application of diffusion hardening technology |
| US11351031B2 (en) | 2006-01-18 | 2022-06-07 | Smith & Nephew, Inc. | Applications of diffusion hardening techniques |
| US10512544B2 (en) | 2006-01-18 | 2019-12-24 | Smith & Nephew, Inc. | Applications of diffusion hardening techniques |
| US9775713B2 (en) | 2006-01-18 | 2017-10-03 | Smith & Nephew, Inc. | Applications of diffusion hardening techniques |
| JP2010014473A (en) * | 2008-07-02 | 2010-01-21 | Ntn Corp | Detection method of detecting temporal change generated when contact fatigue damage is generated |
| JP2010014474A (en) * | 2008-07-02 | 2010-01-21 | Ntn Corp | Detection method for detecting state of occurrence of contact fatigue damage on fixed type constant velocity universal joint |
| EP2554709A4 (en) * | 2010-03-29 | 2014-05-28 | Ntn Toyo Bearing Co Ltd | Bearing part, bearing and bearing part inspection method |
| EP2554709A1 (en) * | 2010-03-29 | 2013-02-06 | NTN Corporation | Bearing part, bearing and bearing part inspection method |
| US9032783B2 (en) | 2010-03-29 | 2015-05-19 | Ntn Corporation | Bearing part, bearing, and method for inspecting bearing part |
| CN102859025A (en) * | 2010-03-29 | 2013-01-02 | Ntn株式会社 | Bearing Part, Bearing And Bearing Part Inspection Method |
| JP2011209021A (en) * | 2010-03-29 | 2011-10-20 | Ntn Corp | Bearing part, bearing, and bearing part inspection method |
| WO2011122632A1 (en) * | 2010-03-29 | 2011-10-06 | Ntn株式会社 | Bearing part, bearing and bearing part inspection method |
| WO2014125952A1 (en) * | 2013-02-13 | 2014-08-21 | Ntn株式会社 | Bearing components and rolling bearing |
| JP2014152377A (en) * | 2013-02-13 | 2014-08-25 | Ntn Corp | Bearing component and rolling bearing |
| CN105026603A (en) * | 2013-02-13 | 2015-11-04 | Ntn株式会社 | Bearing components and rolling bearing |
| EP2957650A4 (en) * | 2013-02-13 | 2016-06-29 | Ntn Toyo Bearing Co Ltd | Bearing components and rolling bearing |
| CN107254658A (en) * | 2013-02-13 | 2017-10-17 | Ntn株式会社 | Parts of bearings and rolling bearing |
| US10344801B2 (en) | 2013-02-13 | 2019-07-09 | Ntn Corporation | Bearing part and rolling bearing |
| CN107254658B (en) * | 2013-02-13 | 2019-11-01 | Ntn株式会社 | Parts of bearings and rolling bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3047088B2 (en) | 2000-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3538995B2 (en) | Rolling bearing | |
| JP3605830B2 (en) | Continuous annealing furnace, annealing method and method for manufacturing inner and outer rings of rolling bearing | |
| JP2590645B2 (en) | Rolling bearing | |
| US5658082A (en) | Rolling contact bearing and a method of producing thereof | |
| EP0718513B1 (en) | Mechanical part having rolling elements | |
| US5427457A (en) | Rolling bearing | |
| JP4423754B2 (en) | Manufacturing method of rolling shaft | |
| US6488789B2 (en) | Wheel bearing unit | |
| WO1998044270A1 (en) | Rolling bearing | |
| JP5045491B2 (en) | Large rolling bearing | |
| JPH0727139A (en) | Rolling bearing | |
| JP3787663B2 (en) | Heat treatment method for rolling bearings | |
| JPH09257041A (en) | Rolling bearing resistant for surface flaw | |
| JPWO2002038984A1 (en) | Toroidal-type continuously variable transmission and method of manufacturing the same | |
| JP3047088B2 (en) | Machine parts having rolling elements | |
| JP2005195148A (en) | Thrust needle roller bearing | |
| JP2002180203A (en) | Needle bearing components, and method for producing the components | |
| JP2961768B2 (en) | Rolling bearing | |
| JP2002194438A (en) | Rolling bearing | |
| US7270607B2 (en) | Constant velocity universal joint and method of manufacturing the same | |
| JP2962817B2 (en) | Rolling bearing | |
| JP3543376B2 (en) | Rolling bearing with surface hardened layer | |
| JP2001187921A (en) | Needle roller bearing parts | |
| JP2004205047A (en) | Rolling bearing | |
| Burrier Jr | Bearing steels |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080324 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090324 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090324 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100324 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100324 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110324 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110324 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120324 Year of fee payment: 12 |
|
| EXPY | Cancellation because of completion of term |