JP3321862B2 - Outer race for constant velocity joints - Google Patents
Outer race for constant velocity jointsInfo
- Publication number
- JP3321862B2 JP3321862B2 JP32651392A JP32651392A JP3321862B2 JP 3321862 B2 JP3321862 B2 JP 3321862B2 JP 32651392 A JP32651392 A JP 32651392A JP 32651392 A JP32651392 A JP 32651392A JP 3321862 B2 JP3321862 B2 JP 3321862B2
- Authority
- JP
- Japan
- Prior art keywords
- hardened layer
- outer race
- constant velocity
- velocity joint
- 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.)
- Expired - Fee Related
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
- F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
- F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐面疲労性および耐摩
耗性に優れた等速ジョイント用アウターレースに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer race for a constant velocity joint having excellent surface fatigue resistance and wear resistance.
【０００２】[0002]
【従来の技術】一般に鋼部品の耐疲労性、耐摩耗性を向
上させるには表面層を硬化させることが有効であること
が知られており、その方法としては高周波焼き入れ、あ
るいは窒化または軟窒化処理等を行い、表層部において
焼き入れマルテンサイト組織あるいは硬い窒素化合物層
と固溶窒素による硬化層を形成させることが従来より行
われている。同様に、等速度ジョイント用アウターレー
スにおいても、高周波焼き入れなどにより、表面層部に
焼き入れマルテンサイト組織を形成させて、耐疲労性お
よび耐摩耗性を付与することが行われている。2. Description of the Related Art It is generally known that it is effective to harden a surface layer in order to improve the fatigue resistance and wear resistance of a steel part. The method is induction hardening, nitriding or softening. 2. Description of the Related Art It has been conventionally performed to perform a nitriding treatment or the like to form a hardened martensite structure or a hard nitrogen compound layer and a hardened layer by solid solution nitrogen in a surface layer portion. Similarly, in the outer race for a constant velocity joint, a hardened martensitic structure is formed in the surface layer by induction hardening or the like to impart fatigue resistance and wear resistance.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、高周波
焼き入れなどによって表面層部に生成する焼き入れマル
テンサイト組織は、その生成層の厚さを比較的容易に制
御できるという利点はあるが、表面硬化層の硬度は母材
炭素量により決定されてしまうため構造用鋼では硬度に
限界があるという問題点がある。However, the quenched martensitic structure generated in the surface layer by induction hardening has the advantage that the thickness of the generated layer can be controlled relatively easily. Since the hardness of the layer is determined by the amount of carbon in the base metal, there is a problem that the hardness is limited in structural steel.
【０００４】窒素と親和性の強い元素、例えばアルミニ
ウム、クロム、およびバナジウムなどを含有する鋼を窒
化あるいは軟窒化させることにより形成される表面硬化
層は、硬い複窒化物および窒素の固溶体硬化により著し
く硬化する。しかし、その表面硬化層は極めて浅く、ま
た脆弱で剥離しやすいため、転がり成分に対するすべり
成分（すべり率）の高い状態での耐面疲労強度が要求さ
れる等速ジョイント用アウターレースのボール転動溝部
への適用は好ましくない。[0004] The surface hardened layer formed by nitriding or nitrocarburizing steel containing elements having a strong affinity for nitrogen, such as aluminum, chromium, and vanadium, is remarkably formed by hard double nitride and solid solution hardening of nitrogen. To cure. However, since the surface hardened layer is extremely shallow, fragile and easily peeled, the ball rolling of the outer race for constant velocity joints that requires surface fatigue resistance in the state of a high slip component (slip ratio) relative to the rolling component is required. Application to the groove is not preferable.
【０００５】本発明は、等速ジョイント用アウターレー
スの転動溝部において、上記問題点を解決し、剥離しに
くい硬い組織からなる表面硬化層を有する等速ジョイン
ト用アウターレースを提供することを目的とする。An object of the present invention is to provide an outer race for a constant velocity joint having a surface hardened layer made of a hard tissue which is difficult to peel off, by solving the above-mentioned problems in the rolling groove portion of the outer race for a constant velocity joint. And
【０００６】本発明は構造用鋼を用いた等速ジョイント
用アウターレースのボール転動溝部表面の硬化層におい
て、母材固溶窒素量よりも高い濃度の窒素を固溶した焼
き入れマルテンサイト組織を有する表面硬化層と、前記
硬化層を支える深部硬化層からなり、前記表面硬化層
は、表面から部品肉厚の０．６〜２０％であり、前記深
部硬化層は、母材固溶窒素量と同じであるマルテンサイ
ト組織であることを特徴とする等速ジョイント用アウタ
ーレースの構成とした。The present invention provides a hardened martensite structure in which a hardened layer on the surface of a ball rolling groove of an outer race for a constant velocity joint using structural steel contains a higher concentration of nitrogen than the base material solute nitrogen. And a deep hardened layer that supports the hardened layer, wherein the hardened surface layer is 0.6 to 20% of the part thickness from the surface, and the deep hardened layer is formed of a base material solid solution nitrogen. The outer race for a constant velocity joint was characterized in that it had the same martensite structure as the amount.
【０００７】[0007]
【作用】本発明は、構造用鋼を用いた等速ジョイント用
アウターレースのボール転動溝部において、母材固溶窒
素量よりも高い濃度の窒素を固溶した焼き入れマルテン
サイト組織の硬化層が、表面から部品肉厚の０．６〜２
０％からなる。According to the present invention, a hardened martensitic structure in which a higher concentration of nitrogen in the base race is dissolved in a ball rolling groove of an outer race for a constant velocity joint using structural steel. Is 0.6 to 2 parts thickness from the surface
Consists of 0%.
【０００８】曲率を有する弾性体が、互いに押し付けら
れた際の応力を弾性解析した結果により、垂直応力の最
大値は表面であるのに対して、せん断応力については表
面からある深さの位置で最大値をとり、すべり率の増加
と共に最大位置が表面に近づくことが知られている。等
速ジョイント用アウターレースのボール転動部において
は、平均のすべり率が高く、最大せん断応力発生位置は
表面から０．６〜５％であることから、表面から部品肉
厚の０．６〜２０％の表面層が耐面疲労性および耐摩耗
性に最も大きく影響する。従って、表面から部品肉厚の
０．６〜２０％の表面層を最も強化することが有効であ
る。According to the result of elastic analysis of the stress when the elastic bodies having a curvature are pressed against each other, the maximum value of the vertical stress is on the surface, whereas the shear stress is at a certain depth from the surface. It is known that the maximum value approaches the maximum position with the increase of the slip ratio. In the ball rolling portion of the outer race for the constant velocity joint, the average slip ratio is high, and the maximum shear stress generation position is 0.6 to 5% from the surface. 20% of the surface layer has the greatest influence on the surface fatigue resistance and wear resistance. Therefore, it is effective to reinforce the surface layer of 0.6 to 20% of the part thickness from the surface.
【０００９】[0009]
【実施例】本発明において、該表面硬化層の表面から部
品肉厚の０．６〜２０％に形成した母材固溶量よりも高
い量の窒素を固溶した焼き入れマルテンサイト組織は、
非常に微細なラス状形態を呈し、通常の焼き入れマルテ
ンサイト組織より高硬度および高靱性の特性を有する。
残部硬化層は母材成分と同じ通常の焼き入れマルテンサ
イトであるが、微細ラス状マルテンサイト組織と該残部
硬化層の境界部は、第１図（ａ）のようになるため硬化
層部での硬度変化は緩やかである。このような本発明硬
化層は、接触面圧が短時間に大きく変化し、また平均す
べり率が高い等速ジョイント用アウターレースのボール
転動面において、従来技術での表面硬度ならびに脆弱・
剥離の難点を克服し、耐面疲労性、耐摩耗性を著しく向
上させることができる。In the present invention, a quenched martensitic structure in which nitrogen is dissolved in an amount higher than the solid solution amount of the base material formed to 0.6 to 20% of the part thickness from the surface of the surface hardened layer is:
It has a very fine lath morphology and has higher hardness and higher toughness characteristics than the normal hardened martensite structure.
The remaining hardened layer is the same as normal quenched martensite as the base material component, but the boundary between the fine lath martensite structure and the remaining hardened layer is as shown in FIG. The hardness change is moderate. Such a hardened layer of the present invention has a large contact surface pressure in a short time, and has a high average slip ratio on the ball rolling surface of an outer race for a constant velocity joint.
The difficulty of peeling can be overcome, and the surface fatigue resistance and wear resistance can be significantly improved.
【００１０】表面から部品肉厚の０．６〜２０％の表面
層を最も強化する場合、硬化層を支える深部硬化層が必
要であり、好ましくは硬化層を含め表面から５％〜１３
％（乗用車では、１．５［ｍｍ］〜４．０［ｍｍ］に相
当）程度までの硬化層を形成させることが理想的であ
る。When the surface layer of 0.6 to 20% of the part thickness is most strengthened from the surface, a deep hardened layer supporting the hardened layer is required, and preferably 5% to 13% from the surface including the hardened layer.
% (Equivalent to 1.5 [mm] to 4.0 [mm] for passenger cars) is ideally formed.
【００１１】本発明を以下の実施例に基づいて説明す
る。 実施例１ 試料として、組成が炭素０．５５重量％，珪素０．２３
重量％，マンガン重量％，リン０．０２５重量％，硫黄
０．０２９重量％，ニッケル０．０３重量％，クロム
０．２０重量％，モリブデン０．０１重量％およびバナ
ジウム０．１１重量％という組成のＳ５５Ｃ鋼にクロム
およびバナジウムを添加した鋼を用い、真空溶製したの
ち鍛造、焼準および試験片加工を行い、５８０［℃］に
て９０分間塩浴軟窒化処理した。その後、高周波加熱に
より試料表面温度を８５０［℃］まで０．９秒間で昇温
させ、さらに１．９秒間昇温させ１１５０［℃］にて水
焼き入れし、１７０［℃］で１２０分間の焼き戻しを行
い、最終仕上げとして表面層を０．０３［ｍｍ］（表面
から０．１％）研磨除去した。本試料の硬化層は肉厚の
０．７％である。The present invention will be described based on the following examples. Example 1 As a sample, the composition was 0.55% by weight of carbon and 0.23% of silicon.
% Manganese, 0.025% phosphorus, 0.029% sulfur, 0.03% nickel, 0.20% chromium, 0.01% molybdenum and 0.11% vanadium by weight. Using S55C steel obtained by adding chromium and vanadium to S55C steel, vacuum forging, normalizing and specimen processing were performed, and a salt bath nitrocarburizing treatment was performed at 580 ° C. for 90 minutes. Thereafter, the sample surface temperature was raised to 850 [° C.] in 0.9 seconds by high-frequency heating, further raised for 1.9 seconds, quenched in water at 1150 [° C.], and heated at 170 [° C.] for 120 minutes. After tempering, the surface layer was polished and removed as a final finish by 0.03 [mm] (0.1% from the surface). The cured layer of this sample is 0.7% of the thickness.
【００１２】後述するローラーピッチング用試験片につ
いては、直径２６［ｍｍ］、長さ３０［ｍｍ］の試験部
位に対し、また、後述する振動摩擦摩耗試験用の円盤状
試験用片については、直径２４［ｍｍ］，長さ８ｍｍの
平坦部両面に対して以下の作業を行った。まず、高周波
加熱により試料表面温度が８５０［℃］まで０．９秒間
で昇温さる。さらに、１１５０［℃］まで１．９秒間で
昇温して水焼き入れし、１７０［℃］で１２０分間の焼
き戻しを行う。そして、最終仕上げとして表面層を３０
［μｍ］（表面から０．１％）研磨除去し試験に供し
た。The roller pitching test piece described below has a diameter of 26 [mm] and a length of 30 [mm], and the disk-shaped test piece for vibration friction wear test described below has a diameter of 30 mm. The following operation was performed on both surfaces of a flat portion having a length of 24 mm and a length of 8 mm. First, the sample surface temperature is raised to 850 [° C.] in 0.9 seconds by high frequency heating. Further, the temperature is raised to 1150 [° C.] in 1.9 seconds and quenched with water, and tempering is performed at 170 [° C.] for 120 minutes. And, as the final finish, 30
[Μm] (0.1% from the surface) was removed by polishing and used for the test.
【００１３】実施例２ Ｓ５５Ｃ鋼にバナジウム、クロム、モリブデンを添加し
た構造用鋼を温間鍛造および機械加工を行い、その後５
７０［℃］×１８０［分］ガス軟窒化処理し、さらにボ
ール溝部においては、７．５［Ｈｚ］の周波数、１４０
［Ｋｗ］の電力にて３．６秒間高周波加熱した後焼き入
れ処理を行った。最終仕上げとしてボール溝部において
は、表層部０．２［ｍｍ］切削除去し、第五図の１に示
す形状の等速ジョイント用アウターレースに仕上げた。
上記工法にて作成したアウターレースのボール溝部では
表面硬さがＨｖ＝８３０に達し、表面層０．４［ｍｍ］
（表面から１．３％）の微細なラス状の鉄−炭素−窒素
（Ｆｅ−Ｃ−Ｎ）系マルテンサイトと２．３［ｍｍ］
（表面から７．７％）の通常の鉄−炭素（Ｆｅ−Ｃ）系
マルテンサイトからなる硬化層を形成していることを光
学顕微鏡およびＸ線マイクロアナライザーを用いた定性
分析により確認した。EXAMPLE 2 Structural steel obtained by adding vanadium, chromium, and molybdenum to S55C steel was subjected to warm forging and machining, and then to 5%.
Gas nitrocarburizing treatment is performed at 70 [° C.] × 180 [min], and further, at a frequency of 7.5 [Hz], 140
After high-frequency heating with electric power of [Kw] for 3.6 seconds, quenching treatment was performed. As a final finish, in the ball groove portion, the surface layer portion was cut off by 0.2 [mm], and the outer race for a constant velocity joint having the shape shown in 1 of FIG. 5 was finished.
In the ball groove portion of the outer race created by the above method, the surface hardness reached Hv = 830, and the surface layer was 0.4 [mm].
(1.3% from the surface) fine lath-like iron-carbon-nitrogen (Fe-CN) martensite and 2.3 [mm]
The formation of a hardened layer composed of ordinary (7.7% from the surface) iron-carbon (Fe-C) martensite was confirmed by qualitative analysis using an optical microscope and an X-ray microanalyzer.
【００１４】比較例１ 塩浴軟窒化を行うまでは実施例１と同様にして、試験片
２を得た。Comparative Example 1 A test piece 2 was obtained in the same manner as in Example 1 until salt bath nitrocarburizing was performed.
【００１５】比較例２ 高周波加熱を行うまでは実施例１と同様にして試験片３
を得た。Comparative Example 2 A test piece 3 was prepared in the same manner as in Example 1 until high-frequency heating was performed.
I got
【００１６】試験評価 試験片１は、第１図（ａ）に示すように、顕微鏡組織が
表面から０．２［ｍｍ］（表面から０．７％）までは微
細なラス状マルテンサイト組織であり残部硬化層につい
ては通常のマルテンサイト組織であった。硬化層のＸ線
マイクロアナライザーによる分析では微細なラス状マル
テンサイト組織に対応する領域では深部の窒素濃度より
もかなり高い濃度の窒素が同定できた。また表面のＸ線
回折を行った結果、窒素化合物の存在は確認されなかっ
た。これは１１５０℃にて１．９秒間保持した過程で窒
素化合物層が完全に分解し、窒素が内部に拡散固溶した
ためである。以上、明らかなように試験片１は本発明の
該硬化層を有する試験片である。試験片２については、
第１図（ｂ）に示すように表面に生成した１．５×１０
-2［ｍｍ］（表面から０．０５％）の白色層とフェライ
トパーライト混合組織からなっており、この白色層はＸ
線回折により窒素化合物層であることが確認できた。試
験片３については、第１図（ｃ）に示すように表面硬化
層は通常の焼き入れマルテンサイト組織であった。断面
の硬度プロフィールにおいては、第２図の代表例に示す
ように試験片２、試験片３に比較して試験片１は表面か
ら０．２［ｍｍ］（表面から０．７％）まで硬度が試験
片３よりも高く、この硬化深さは試験片２よりも深い。Test Evaluation As shown in FIG. 1 (a), the specimen 1 has a fine lath martensite structure up to 0.2 [mm] from the surface (0.7% from the surface). The remaining hardened layer had a normal martensitic structure. X-ray microanalyzer analysis of the hardened layer identified nitrogen in a region corresponding to the fine lath-like martensitic structure, which was considerably higher than the nitrogen concentration in the deep part. As a result of X-ray diffraction of the surface, the presence of a nitrogen compound was not confirmed. This is because the nitrogen compound layer was completely decomposed in the course of holding at 1150 ° C. for 1.9 seconds, and nitrogen was diffused and dissolved inside. As is clear from the above, the test piece 1 is a test piece having the cured layer of the present invention. For test piece 2,
As shown in FIG. 1 (b), 1.5 × 10
-2 [mm] (0.05% from the surface) and a mixed structure of ferrite and pearlite.
Line diffraction confirmed that the layer was a nitrogen compound layer. As for test piece 3, as shown in FIG. 1 (c), the surface hardened layer had a normal hardened martensite structure. In the hardness profile of the cross section, as shown in the representative example of FIG. 2, the hardness of the test piece 1 is 0.2 mm from the surface (0.7% from the surface) as compared with the test piece 2 and the test piece 3. Is higher than Specimen 3 and this cure depth is deeper than Specimen 2.
【００１７】以上のような熱処理を行った試験片１、試
験片２および試験片３それぞれについて、アウターレー
スのボール転動面の耐面疲労の評価法としてローラーピ
ッチング試験、また耐摩耗製の評価法として振動摩擦摩
耗試験を行った。ローラーピッチング試験については、
アウターレースに良くみられる、ピッチングおよびフレ
ーキング発生の促進条件として以下の条件、即ち 接触面圧；３７５ｋｇ／ｍｍ2 すべり率；−４０％ 相手材；ＳＣＭ４２０浸炭材 潤滑油；等速ジョイント用グリースの基油 なる条件でピッチングあるいはフレーキングの発生寿命
を測定する方法で行った。その結果、第３図に示すよう
に、試験片１は、試験片２および試験片３に比較し５〜
１０倍に寿命が向上することが判明した。また、振動摩
擦摩耗試験については、等速ジョイント内のグリース潤
滑での摩耗状況を再現した促進条件として以下の条件、
で行い試験中の摩擦係数および試験片表面の摩耗深さを
測定する方法で評価した。For each of the test pieces 1, 2 and 3 subjected to the heat treatment as described above, a roller pitting test and an evaluation of wear resistance were performed as methods for evaluating the surface fatigue resistance of the outer race ball rolling surface. A vibration friction wear test was performed as a method. For roller pitching test,
The following conditions are frequently used in the outer race to promote the occurrence of pitting and flaking: contact surface pressure; 375 kg / mm 2 sliding rate; -40% mating material; SCM420 carburized material Lubricating oil; The base oil was used to measure the life of pitting or flaking under the following conditions. As a result, as shown in FIG. 3, the test piece 1 was 5 to 5 times larger than the test piece 2 and the test piece 3.
It was found that the life was improved ten times. In addition, for the vibration friction wear test, the following conditions were used as acceleration conditions to reproduce the wear situation with grease lubrication in the constant velocity joint.
The evaluation was carried out by measuring the coefficient of friction during the test and the wear depth of the test piece surface.
【００１８】試験片形状； 円盤状 接触面圧； ２２１［ｋｇ／ｍｍ2］ 試験片温度； ８０℃均熱 潤滑油；等速ジョイント用グリース 振動摩擦条件；相手材を５０［Ｈｚ］の周波数で３０分
間連続振動 以上の条件で行った試験結果については第４図に示すよ
うに、試験片１は試験片２および試験片３に対し摩擦係
数に差異は認められなかったが、摩耗深さが１／３に大
きく抑えられた。Specimen shape; Disk contact surface pressure; 221 [kg / mm 2 ] Specimen temperature; 80 ° C soaking Lubricating oil; Grease for constant velocity joint Vibration friction conditions; Continuous vibration for 30 minutes As shown in FIG. 4, the test results obtained under the above conditions showed no difference in the coefficient of friction between the test piece 1 and the test piece 2 and the test piece 3, but the wear depth was low. It was greatly reduced to 1/3.
【００１９】本試験例より、塩浴軟窒化後高周波加熱保
持焼き入れ処理により得られた本発明の硬化層は、耐面
疲労性および耐摩耗性向上に大きな効果のあることが確
認できた。From this test example, it was confirmed that the hardened layer of the present invention obtained by the high frequency heating holding quenching after the salt bath nitrocarburizing has a great effect on improving the surface fatigue resistance and the wear resistance.
【００２０】試験例２ 第５図に示すように、本発明のアウターレース１、ＳＣ
ｒ４２０浸炭焼き入れインナーレース２、ボール溝部
３、ＳＵＪ２焼き入れ焼き戻しボール４、ボールゲージ
５およびグリース６、さらには中間軸７から構成される
等速ジョイントと、比較のためＳ５５Ｃ鋼の高周波焼き
入れにより作成した従来アウターレースを用いた等速ジ
ョイント各々について、動力循環式耐久評価試験機を用
い、下記条件で試験し、その結果を第６図に示した。 回転数；７００［ｒｐｍ．］ 負荷トルク；３４〜４５［ｋｇｆｍ］ 角度変動パターン；約２０［度］の幅にて１５［秒］周
期で変動 耐久時間；７５［時間］ 第６図に示すように本発明の等速ジョイント用アウター
レースは全く損失がみられなかったのに対し、従来アウ
ターレースはフレーキングと思われる面疲労現象が認め
られた。また、試験前後のグリースを分析して比較した
結果、外観、調度、滴点、水分および全酸化価いずれも
差が認められなかった。しかし、鉄分量については、全
構成部品で損傷が殆ど見られないとき、本発明の等速ジ
ョイント用アウターレースは、耐面疲労性および耐摩耗
性に優れた特性を有することが確認できた。Test Example 2 As shown in FIG. 5, the outer race 1 of the present invention, SC
r420 carburized hardened inner race 2, ball groove 3, SUJ2 hardened and tempered ball 4, ball gauge 5, grease 6, and constant velocity joint composed of intermediate shaft 7, and induction hardened S55C steel for comparison Each of the constant velocity joints using the conventional outer race prepared by the above method was tested under the following conditions using a power circulation type durability evaluation tester, and the results are shown in FIG. Rotation speed: 700 [rpm. Load torque; 34 to 45 [kgfm] Angular variation pattern; Cycles every 15 [seconds] in a width of about 20 [degrees] Durability time: 75 [hours] As shown in FIG. The outer race had no loss at all, whereas the conventional outer race had a surface fatigue phenomenon considered to be flaking. Further, as a result of analyzing and comparing the grease before and after the test, no difference was observed in any of the appearance, the preparation, the dropping point, the moisture and the total oxidation value. However, as for the iron content, when almost no damage was observed in all the components, it was confirmed that the outer race for the constant velocity joint of the present invention had excellent properties in surface fatigue resistance and wear resistance.
【００２１】本発明の適用鋼としては、本実施例以外
に、基本鋼に炭素量０．３％以上０．７％未満の炭素鋼
を用い、クロム０．２％以上１．５％未満、バナジウム
０．１％以上０．４％未満およびモリブデン０．１％以
上０．９％未満添加した鋼が望ましい。また本実施例に
おいては、塩浴軟窒化後高周波加熱保持焼き入れによ
り、本発明の硬化層を得たが、そのほかイオン窒化、プ
ラズマ浸炭窒化、ガス軟窒化およびガス浸炭窒化などの
処理後、高周波加熱焼き入れ、レーザ加熱焼き入れ、炉
中加熱焼き入れおよび火炎焼き入れ処理してもよい。As the steel to which the present invention is applied, in addition to the present embodiment, a carbon steel having a carbon content of 0.3% or more and less than 0.7% is used as a basic steel, and chromium is 0.2% or more and less than 1.5%. Steel added with vanadium 0.1% or more and less than 0.4% and molybdenum 0.1% or more and less than 0.9% is desirable. In this example, the hardened layer of the present invention was obtained by high-frequency heating and holding and quenching after salt bath nitrocarburizing, but after other treatments such as ion nitriding, plasma nitrocarburizing, gas nitrocarburizing and gas nitrocarburizing, Heat quenching, laser heating quenching, heat quenching in a furnace, and flame quenching may be performed.
【００２２】[0022]
【発明の効果】以上説明してきたように、本発明の構成
とすることにより等速ジョイント用アウターレースのボ
ール溝部において、従来の表面硬化層に比較して耐面疲
労性をおよび耐摩耗性を飛躍的に向上させる効果を有
し、部品の小型軽量化に多大に貢献できるものである。As described above, the structure of the present invention makes the outer race for a constant velocity joint more resistant to surface fatigue and abrasion than the conventional hardened layer in the ball groove portion. It has the effect of dramatically improving and can greatly contribute to reducing the size and weight of parts.
【図１】 本発明実施例における試験片の断面ミクロ組
織の模式図FIG. 1 is a schematic diagram of a cross-sectional microstructure of a test piece according to an example of the present invention.
【図２】 本発明実施例における試験片断面の硬度プロ
フィールFIG. 2 is a hardness profile of a cross section of a test piece in an example of the present invention.
【図３】 ローラーピッチング試験結果Fig. 3 Roller pitching test results
【図４】 振動摩擦摩耗試験結果Fig. 4 Results of vibration friction wear test
【図５】 等速ジョイント用アウターレースの構造Fig. 5 Structure of outer race for constant velocity joint
【図６】 動力循環式耐久評価試験結果Fig. 6 Results of power circulation type endurance evaluation test
【図５】 １ アウターレース ２ インナーレース ３ ボール溝部 ４ ボール ５ ボールゲージ ６ グリース ７ 中間軸（ドライブシャフト）[Fig. 5] 1 outer race 2 inner race 3 ball groove 4 ball 5 ball gauge 6 grease 7 intermediate shaft (drive shaft)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−251525（ＪＰ，Ａ) 特開 平５−240253（ＪＰ，Ａ) 特開 平５−65592（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16D 3/20 - 3/229 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-251525 (JP, A) JP-A-5-240253 (JP, A) JP-A-5-65592 (JP, A) (58) Field (Int.Cl. 7 , DB name) F16D 3/20-3/229
Claims (7)
ターレースのボール転動溝部表面の硬化層において、 母材固溶窒素量よりも高い濃度の窒素を固溶した焼き入
れマルテンサイト組織を有する表面硬化層と、 前記硬化層を支える深部硬化層からなり、 前記表面硬化層は、表面から部品肉厚の０．６〜２０％
であり、 前記深部硬化層は、母材固溶窒素量と同じであるマルテ
ンサイト組織であることを特徴とする等速ジョイント用
アウターレース。1. A hardened martensite structure in which nitrogen having a concentration higher than the amount of solid-dissolved nitrogen is dissolved in a hardened layer on the surface of a ball rolling groove of an outer race for a constant velocity joint using structural steel. A surface hardened layer, and a deep hardened layer supporting the hardened layer, wherein the hardened surface layer is 0.6 to 20% of the part thickness from the surface.
The outer race for a constant velocity joint, wherein the deep hardened layer has a martensite structure that is the same as the amount of dissolved nitrogen in the base material.
ターレースのボール転動溝部表面の硬化層において、 前記硬化層が、深部硬化層と表面硬化層との２層のマル
テンサイト組織を有し、該表面硬化層は該深部硬化層よ
りも組織が微細な微細ラス状マルテンサイト組織を有
し、かつ表面から部品肉厚の０．６〜２０％であるこを
特徴とする等速ジョイント用アウターレース。2. A hardened layer on the surface of a ball rolling groove portion of an outer race for a constant velocity joint using structural steel, wherein the hardened layer has a martensite structure of two layers of a deep hardened layer and a surface hardened layer. The surface-hardened layer has a fine lath-like martensite structure whose structure is finer than that of the deep-layer hardened layer, and is 0.6 to 20% of the part thickness from the surface. Outer race.
硬化層の境界部の硬度変化は緩やかであることを特徴と
する請求項１または２項記載の等速ジョイント用アウタ
ーレース。3. The outer race for a constant velocity joint according to claim 1, wherein a hardness change at a boundary between the lath martensite structure and the deep hardened layer is gradual.
ーレースのボール転動溝部の表面硬化層の顕微鏡組織が
マルテンサイト組織であり、 前記表面硬化層は表面から部品肉厚の少なくとも０．７
％までは残部硬化層より微細な組織で窒素濃度が高いラ
ス状マルテンサイト組織であることを特徴とする特許請
求の範囲１項乃至３項記載の等速ジョイント用アウター
レース。4. The microstructure of a surface hardened layer in a ball rolling groove portion of an outer race for a constant velocity joint using structural steel is a martensite structure, and the surface hardened layer has a thickness of at least 0. 7
The outer race for a constant velocity joint according to any one of claims 1 to 3, wherein up to% is a lath martensite structure having a finer structure than the remaining hardened layer and a high nitrogen concentration.
ーレースのボール転動溝部の表面硬化層の顕微鏡組織が
マルテンサイト組織であり、 前記表面硬化層は、表面から少なくとも０．２ｍｍまで
は残部硬化層より微細な組織で窒素濃度が高いラス状マ
ルテンサイト組織であることを特徴とする特許請求の範
囲１項乃至４項記載の等速ジョイント用アウターレー
ス。5. The microstructure of a surface hardened layer in a ball rolling groove portion of an outer race for a constant velocity joint using structural steel is a martensite structure, and the surface hardened layer is at least 0.2 mm from the surface. 5. The outer race for a constant velocity joint according to claim 1, wherein the outer race has a lath martensite structure having a finer structure and a higher nitrogen concentration than the remaining hardened layer.
の０．７％〜１．３％であることを特徴とする特許請求
の範囲１項乃至５項記載の等速ジョイント用アウターレ
ース。6. The outer race for a constant velocity joint according to claim 1, wherein said lath martensite structure is 0.7% to 1.3% of a part thickness.
少なくとも０．２ｍｍ〜０．４ｍｍであることを特徴と
する特許請求の範囲１項乃至６項記載の等速ジョイント
用アウターレース。7. The outer race for a constant velocity joint according to claim 1, wherein said lath martensite structure is at least 0.2 mm to 0.4 mm from the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32651392A JP3321862B2 (en) | 1992-12-07 | 1992-12-07 | Outer race for constant velocity joints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32651392A JP3321862B2 (en) | 1992-12-07 | 1992-12-07 | Outer race for constant velocity joints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06173967A JPH06173967A (en) | 1994-06-21 |
| JP3321862B2 true JP3321862B2 (en) | 2002-09-09 |
Family
ID=18188674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32651392A Expired - Fee Related JP3321862B2 (en) | 1992-12-07 | 1992-12-07 | Outer race for constant velocity joints |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3321862B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6390924B1 (en) * | 1999-01-12 | 2002-05-21 | Ntn Corporation | Power transmission shaft and constant velocity joint |
| JP2002122145A (en) | 2000-10-13 | 2002-04-26 | Nachi Fujikoshi Corp | Ball for constant velocity universal joint |
| JP3585034B2 (en) | 2000-12-14 | 2004-11-04 | 日産自動車株式会社 | High-strength lace and manufacturing method thereof |
| JP2002188653A (en) * | 2000-12-20 | 2002-07-05 | Ntn Corp | Uniform motion universal joint |
| WO2007102533A1 (en) * | 2006-03-07 | 2007-09-13 | Ntn Corporation | Machine element, constant velocity universal joint and process for manufacturing them |
| JP2007255461A (en) * | 2006-03-20 | 2007-10-04 | Ntn Corp | Constant velocity universal joint |
| JP5322001B2 (en) * | 2008-05-19 | 2013-10-23 | 高周波熱錬株式会社 | Steel material, manufacturing method thereof and induction-hardened component |
| JP5927018B2 (en) * | 2011-04-26 | 2016-05-25 | Ntn株式会社 | Manufacturing method of machine parts |
| JP6191357B2 (en) * | 2013-09-19 | 2017-09-06 | 新日鐵住金株式会社 | Steel heat treatment method |
| JP6561816B2 (en) * | 2015-12-15 | 2019-08-21 | 日本製鉄株式会社 | Crankshaft and manufacturing method thereof |
| JP7236850B2 (en) * | 2018-11-29 | 2023-03-10 | Ntn株式会社 | HUB UNIT WITH STEERING FUNCTION AND VEHICLE INCLUDING THE SAME |
-
1992
- 1992-12-07 JP JP32651392A patent/JP3321862B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06173967A (en) | 1994-06-21 |
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