WO2011122371A1 - 転がり軸受 - Google Patents
転がり軸受 Download PDFInfo
- Publication number
- WO2011122371A1 WO2011122371A1 PCT/JP2011/056585 JP2011056585W WO2011122371A1 WO 2011122371 A1 WO2011122371 A1 WO 2011122371A1 JP 2011056585 W JP2011056585 W JP 2011056585W WO 2011122371 A1 WO2011122371 A1 WO 2011122371A1
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- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- steel
- peeling
- brittle
- chromium
- Prior art date
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Classifications
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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
- F16C33/32—Balls
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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
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
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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
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
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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
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/70—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent
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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
- F16C2361/00—Apparatus or articles in engineering in general
- F16C2361/61—Toothed gear systems, e.g. support of pinion shafts
Definitions
- the present invention relates to a rolling bearing used for automotive parts such as transmissions, which suppresses brittle peeling of inner and outer ring raceway surfaces and rolling element surfaces and peeling of indentation starting points due to foreign matters in lubricating oil.
- the rolling bearing covers the inner ring 1 with a cage 2 and houses a rolling element 3 made of a steel ball or the like in the cage 2, and further attaches an outer ring 4.
- the inner ring 1 and the outer ring 4 are smoothly rotated relative to each other around the axis.
- the inner and outer rings 1, 4 and the rolling element 3 are lubricated with lubricating oil.
- This lubricating oil is in a clean state at the beginning of use, but wear powder generated from the peripheral structure of the bearing such as a gear is mixed with the use of the bearing.
- the wear powder is caught between the raceway surfaces 1a and 4a of the inner and outer rings 1 and 4 and the rolling elements 3, and wears the surfaces of the raceway surfaces 1a and 4a and the rolling elements 3 to shorten the bearing life. There is a problem.
- One of the causes of peeling of the bearing raceways 1a, 4a, etc. caused by the wear powder is a structure in which carbon in the steel aggregates at a high concentration and is observed in white under a microscope (hereinafter referred to as “white layer”). .)
- This white layer has a very high hardness compared to the parent phase and is brittle, and cracks are likely to occur in the mother phase starting from this white layer. And it is thought that the crack of this mother phase propagates gradually and leads to peeling (hereinafter referred to as “brittle peeling”).
- the following Patent Document 1 contains 2.0 to 5.0% by weight of chromium in the bearing steel, slows the diffusion rate of carbon in this steel, and forms a white layer. I try to prevent it.
- the chromium concentration range is the above range because if it falls below this concentration range, the effect of suppressing the diffusion of carbon cannot be obtained, and if this concentration range is exceeded, the workability of the steel may decrease. Has been.
- Patent Document 2 discloses a bearing in which a bearing steel containing 0.2 to 1.2% by weight of chromium is subjected to carbonitriding and then subjected to quenching and tempering.
- carbonitriding treatment carbon and nitrogen are introduced into the surface layer portion of the steel in an atmosphere containing carbon and nitrogen (gas phase or liquid phase).
- the carbonitriding process in the gas phase is generally performed by using a reducing air-fuel mixture mainly composed of carbon monoxide and hydrogen to which ammonia is added.
- the chromium concentration range is the above range because the hardness of the surface layer becomes insufficient when the concentration range is below this range, and if this concentration range is exceeded, the carbide tends to coarsen and easily become the starting point of peeling. ing.
- an object of the present invention is to improve the bearing life by suppressing brittle separation and indentation-induced separation of the raceway surfaces and rolling elements of the inner and outer rings of the bearing.
- the present invention adds chromium in a weight ratio exceeding 1.6% within a range of less than 2.0%, and performs quenching and tempering treatment on the carbonitrided steel.
- the bearing was formed using steel having a retained austenite region in which the composition ratio of retained austenite was higher than that inside the surface layer portion.
- Carbon and nitrogen are unevenly distributed at a high concentration on the surface of the steel subjected to the carbonitriding process.
- This carbon has the role of enhancing the hardenability of the steel and increasing its surface hardness.
- nitrogen lowers the Ms point as described above, the composition ratio of retained austenite after quenching can be increased.
- By the action of carbon and nitrogen it is possible to impart toughness due to the retained austenite region while ensuring a predetermined hardness of the surface layer portion of the steel.
- a dense chromium oxide film having high corrosion resistance is formed on the outermost surface of the steel, and this film makes the surface state more stable.
- This chromium concentration range is lower than the chromium concentration range (2.0 to 5.0% described in Patent Document 1) capable of suppressing brittle peeling, but the carbon and nitrogen concentrations in the surface layer are increased by carbonitriding. Thereby, the brittle peeling suppression effect can be exhibited.
- the reason for this is not clearly understood, but it is possible that the nitrogen implanted in the above process formed a compressive stress field in this surface layer, and this compressive stress field suppressed brittle peeling (progress of cracks). There is sex.
- this chromium concentration range is higher than the chromium concentration range (0.2 to 1.2% described in Patent Document 2) that can suppress indentation-induced separation, but the carbide coarseness described in Patent Document 2 is large. Since the crystallization can be avoided by adjusting the concentration of carbon or the like and the carbonitriding conditions, there is no problem caused by carbide even in the chromium concentration range of the present invention.
- concentration of the said chromium into the range of 1.80% or more and 1.89% or less.
- the ratio of retained austenite to the parent phase is in the range of 10 to 50% in the retained austenite region.
- the ratio of retained austenite is less than the above range, the toughness of the raceway surface and the rolling element surface is lowered, and the suppression of indentation-induced separation becomes insufficient.
- the ratio of retained austenite exceeds the above range, the wear resistance may be insufficient and the bearing life may be shortened.
- region from the surface to the area
- the retained austenite has a role of imparting toughness to the surface layer portion, but if the region is too shallow, sufficient toughness of the surface layer portion cannot be imparted. Therefore, if this retained austenite region is formed to the above depth, sufficient toughness can be imparted, and even when wear powder is mixed in the lubricating oil, the occurrence of indentation-induced delamination can be effectively suppressed. .
- the carbonitriding treatment in each configuration is performed in an atmosphere in which 5 to 10% of ammonia is added to a so-called RX gas whose gas composition is mainly composed of carbon monoxide 18 to 25% and hydrogen 28 to 50%. It is made with quenching and tempering treatment. Usually, this quenching is performed from 830 to 860 ° C., and tempering is performed at 180 ° C. or less. When carbonitriding is performed under these processing conditions, appropriate amounts of carbon and nitrogen are introduced from the surface, so that a retained austenite region necessary for suppressing indentation-induced separation can be formed.
- the bearing shown in each of the above configurations can be used for a deep groove ball bearing, an angular ball bearing, a double row angular ball bearing, a tapered roller bearing, a double row tapered roller bearing, a cylindrical roller bearing, or a double row cylindrical roller bearing.
- these bearings can be employed in automobile transmissions, pulleys, alternators, electromagnetic clutches, or wheels.
- These power transmission components for automobiles are often used in harsh environments involving high temperatures and vibrations.
- brittle peeling is likely to occur on the raceway surfaces of the inner and outer rings and the surface of the rolling element, and indentation-induced peeling often occurs continuously due to wear powder mixed in the lubricating oil. Therefore, when a bearing in which the above-described treatment is applied to the steel surface is employed, this brittle peeling and indentation-induced peeling can be effectively suppressed, and stable relative rotation of the bearing can be ensured over a long period of time.
- chromium is added to the steel constituting the bearing, and carbonitriding is performed and quenching is performed, thereby suppressing brittle peeling and also suppressing indentation-induced peeling due to the toughness provided by the retained austenite region. it can. For this reason, the lifetime of the bearing can be improved, and the cost required for maintenance such as replacement of the lubricating oil can be reduced.
- Rolling element (steel ball) 4 outer ring 4a (outer ring) raceway surface 5 retained austenite region 6 chromium oxide coating
- FIG. 1 shows an embodiment of a rolling bearing according to the present invention.
- This rolling bearing is a deep groove ball bearing in which a plurality of steel balls 3 are provided between the inner ring 1 and the outer ring 4, and the steel balls 3 are held by a cage 2.
- the inner and outer rings 1 and 4 and the steel ball 3 are made of bearing steel to which chromium is additionally added (hereinafter referred to as “brittle-resistant exfoliated steel”), and the weight ratio of chromium exceeds 1.6%. Within the range of less than 0%.
- the carbonitriding treatment is applied to the raceway surfaces 1a, 4a of the inner and outer rings 1, 4 and the surface of the steel balls 3.
- This carbonitriding process involves quenching and tempering the inner and outer rings 1, 4 and the steel ball 3 in a treatment atmosphere containing 18 to 25% carbon monoxide, 28 to 50% hydrogen, and 5 to 10% ammonia. Made with. This quenching is performed from 830 to 860 ° C., and tempering is performed at 180 ° C. or less.
- FIG. 2 shows a schematic diagram of a cross section near the surface of the inner ring 1 subjected to the quenching and tempering treatment.
- the “white layer” described in the background art is not observed in the surface layer portion of the steel processed under the above processing conditions. This is because the added chromium suppresses the diffusion of carbon, and the agglomeration of carbon that causes the white layer is less likely to occur. By suppressing this white layer, brittle peeling caused by this can be suppressed.
- a retained austenite region 5 having a higher composition ratio of retained austenite than the inside is formed.
- the composition ratio of retained austenite in the retained austenite region 5 is preferably within a range of 10 to 30%.
- a chromium oxide film 6 is formed on the surface layer of the residual austenite region 5, and the corrosion resistance of the steel is further improved by the chromium oxide film 6.
- the rolling bearing according to the present invention can also be applied to an angular ball bearing, a double row angular ball bearing, a tapered roller bearing, a double row tapered roller bearing, a cylindrical roller bearing, or a double row cylindrical roller bearing.
- Each of these bearings can be employed in an automobile transmission, pulley, alternator, electromagnetic clutch, or wheel. This is because this bearing is less likely to cause brittle peeling and indentation-induced peeling even in a severe use environment under high temperature and vibration, and is particularly suitable for a power transmission component for automobiles used in such an environment.
- Example 1 Using a bearing steel according to the present invention (hereinafter referred to as “brittle-resistant peeled steel”), a deep groove ball bearing having the shape shown in FIG.
- This brittle peel-off steel contains 1.80 to 1.89% chromium by weight, and the above-mentioned carbonitriding treatment is performed on the brittle peel-off steel so that a residual austenite region is formed in the surface layer portion. 5 was formed.
- Example 1 The SUJ2 steel (high carbon chrome bearing steel) shown in Table 1 of JIS G4805 is quenched and tempered under the same conditions as described in Example 1, and a deep groove ball bearing having the shape shown in FIG. Constructed and tested for durability under the same conditions as described in Example 1.
- Example 1 The results of this durability test are shown in Table 2. Under these experimental conditions, it was confirmed that flaking occurred in either the inner or outer ring after about 20 to 110 hours of operation. Further, from the calculation of the Weibull distribution, the L 10 life is 22.3 hours, the time until the cumulative damage probability becomes 50% (hereinafter referred to as “L 50 life”) is 64.9 hours, and the Weibull slope is 1. It became 76. From the results of Example 1 and Comparative Example 1, the brittle peel-off steel is subjected to a predetermined carbonitriding process and quenching and tempering process, and a retained austenite region 5 is formed on the surface thereof. It can be seen that can be greatly improved. As in Example 1, a clear correlation between the outer ring temperature and the time until the bearing reaches the end of its life could not be confirmed.
- Example 2 (Comparative Example 2) The SUJ2 is subjected to the same carbonitriding treatment as described in Example 1, and a deep groove ball bearing having the shape shown in FIG. 1 is configured using this, and is durable under the same conditions as described in Example 1. A sex test was performed.
- Example 1 Table 1
- Comparative Example 2 Table 3
- the durability of this bearing was obtained by adopting brittle peel-resistant steel instead of SUJ2 steel. It can also be seen that it can be greatly improved. This is considered to be due to the fact that the above-described white layer is less likely to be generated by chromium and brittle peeling is suppressed.
- Example 3 As the material of the inner and outer rings and the steel balls constituting the deep groove ball bearing having the shape shown in FIG. 1, the same SUJ2 material and the brittle peel-off steel having an increased chromium concentration were used, and these were subjected to the same quenching and tempering treatment as in Example 1. Later, a durability test was performed. In this durability test, the radial load applied to the bearing filled with grease (E-3) was set to 3240N (the axial load was 0N). Rotation) for 10 seconds, falling for 1 second and stopping for 3 seconds "was repeated for 1 cycle for 15 seconds.
- Table 4 shows the results of this durability test. This durability test was conducted continuously for 1000 hours, and for those that could not be operated due to damage before reaching 1000 hours, describe the time until the damage, etc. Yes.
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- General Engineering & Computer Science (AREA)
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Abstract
Description
この範囲内に調節することで、炭化物の凝集に伴う脆性剥離及び圧痕起因剥離の両効果を最大限に発揮することができる。
残留オーステナイトの比率が上記の範囲を下回ると、軌道面や転動体表面の靭性が低下し、圧痕起因剥離の抑制が不十分となる。その一方で、残留オーステナイトの比率が上記の範囲を上回ると、耐摩耗性が不十分となって、却って軸受寿命が低下することがある。
この残留オーステナイトは、上述したように表層部に靭性を付与する役目を有するが、その領域が浅すぎると表層部の十分な靭性を付与することができない。そこで、この残留オーステナイト領域を上記の深さまで形成すると、十分な靭性を付与することができ、潤滑油中に摩耗粉が混入した場合でも、圧痕起因剥離の発生を効果的に抑制することができる。
これらの自動車用動力伝達部品は、高温・振動を伴う過酷な環境下において使用されることが多い。このような環境下においては、内外輪の軌道面及び転動体の表面の脆性剥離が生じやすく、潤滑油中に混入した摩耗粉によって圧痕起因剥離が連続的に生じることが多い。そこで、鋼の表面に上述した処理を施した軸受を採用すると、この脆性剥離及び圧痕起因剥離が効果的に抑制され、長期間に亘って軸受の安定した相対回転を確保することができる。
1a (内輪の)軌道面
2 保持器
3 転動体(鋼球)
4 外輪
4a (外輪の)軌道面
5 残留オーステナイト領域
6 クロム酸化被膜
本願発明に係る軸受鋼(以下、「耐脆性剥離鋼」という。)を用いて、図1に示す形状の深溝玉軸受を構成し、その耐久性試験を行った。この耐脆性剥離鋼は、重量比でクロムを1.80~1.89%含むものであって、この耐脆性剥離鋼に、上述した浸炭窒化処理を行うことにより、その表層部に残留オーステナイト領域5を形成した。
JISG4805の表1に示すSUJ2鋼(高炭素クロム軸受鋼)に対して、実施例1に記載したのと同じ条件で焼入れ焼戻し処理を行い、これを用いて図1に示す形状の深溝玉軸受を構成し、実施例1に記載したのと同じ条件で耐久性試験を行った。
前記SUJ2に対して、実施例1に記載したのと同じ浸炭窒化処理を行い、これを用いて図1に示す形状の深溝玉軸受を構成し、実施例1に記載したのと同じ条件で耐久性試験を行った。
図1に示す形状の深溝玉軸受を構成する内外輪及び鋼球の素材として、前記SUJ2材及びクロム濃度を高めた耐脆性剥離鋼を用い、これらに実施例1と同じ焼入れ焼戻し処理を行った後に耐久性試験を行った。この耐久性試験は、グリース(E-3)を封入した軸受に負荷されるラジアル荷重を3240N(アキシアル荷重は0N)に設定し、「停止状態から1秒間で立ち上げ、一定速(毎分18000回転)で10秒間運転し、1秒間で立ち下げて、3秒間停止」の1サイクル15秒間の運転を繰り返すことにより実施した。
Claims (7)
- クロムを重量比で1.6%を超え、2.0%未満の範囲内で添加するとともに、浸炭窒化処理を行った鋼に焼入れ及び焼戻し処理を施し、その表層部に、その内部よりも残留オーステナイトの組成比が高い残留オーステナイト領域(5)を形成した前記鋼を用いた転がり軸受。
- 前記クロムの添加濃度を、1.80%以上1.89%以下の範囲内とした請求項1に記載の転がり軸受。
- 前記残留オーステナイト領域(5)において、残留オーステナイトの体積比が、10~50%の範囲内である請求項1又は2に記載の転がり軸受。
- 前記残留オーステナイト領域(5)が、表面から深さ1mmの領域まで形成されている請求項1乃至3のいずれか一つに記載の転がり軸受。
- 前記浸炭窒化処理が、ガス組成が体積比において一酸化炭素18~25%、水素28~50%、アンモニア5~10%を含む雰囲気中において行われる請求項1乃至4のいずれか一つに記載の転がり軸受。
- 深溝玉軸受、アンギュラ玉軸受、複列アンギュラ玉軸受、円錐ころ軸受、複列円錐ころ軸受、円筒ころ軸受、又は複列円筒ころ軸受のいずれかである請求項1乃至5のいずれか一つに記載の転がり軸受。
- 自動車用トランスミッション、プーリ、オルタネータ、電磁クラッチ、又はホイールのいずれかに用いた請求項6に記載の転がり軸受。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201180005471.6A CN102741572B (zh) | 2010-03-30 | 2011-03-18 | 滚动轴承 |
US13/637,369 US20130016938A1 (en) | 2010-03-30 | 2011-03-18 | Rolling bearing |
EP11762604.4A EP2554864A4 (en) | 2010-03-30 | 2011-03-18 | ROLLER BEARING |
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JP2010077982A JP2011208745A (ja) | 2010-03-30 | 2010-03-30 | 転がり軸受 |
JP2010-077982 | 2010-03-30 |
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WO2011122371A1 true WO2011122371A1 (ja) | 2011-10-06 |
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US (1) | US20130016938A1 (ja) |
EP (1) | EP2554864A4 (ja) |
JP (1) | JP2011208745A (ja) |
CN (1) | CN102741572B (ja) |
WO (1) | WO2011122371A1 (ja) |
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CN104662312A (zh) * | 2012-07-16 | 2015-05-27 | 舍弗勒技术股份两合公司 | 滚动轴承元件,特别是滚动轴承环 |
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DE102013201321A1 (de) * | 2013-01-28 | 2014-07-31 | Aktiebolaget Skf | Verfahren zur Herstellung eines Wälzlagers und Wälzlager |
EP2902647A1 (en) * | 2014-02-03 | 2015-08-05 | Siemens Aktiengesellschaft | Bearing having a raceway with high chromium content |
DE112015005630T5 (de) * | 2014-12-16 | 2017-09-21 | Aktiebolaget Skf | Lagerkomponente und Verfahren |
JP6535276B2 (ja) * | 2015-12-09 | 2019-06-26 | 株式会社ジェイテクト | 軸受構成部材及びその製造方法並びに転がり軸受 |
CN109642615B (zh) * | 2016-08-26 | 2020-09-22 | 日本精工株式会社 | 滚动轴承及其制造方法 |
CN110249146A (zh) * | 2017-02-02 | 2019-09-17 | 日本精工株式会社 | 滚动轴承 |
CN109268395B (zh) * | 2018-10-12 | 2020-11-24 | 翟长生 | 一种角接触球轴承套圈复合强化工艺 |
CN112833143B (zh) * | 2021-01-11 | 2022-05-31 | 珠海格力电器股份有限公司 | 减速器和机器人 |
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JPH0826446B2 (ja) * | 1990-05-17 | 1996-03-13 | 日本精工株式会社 | 転がり軸受 |
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NL1012391C2 (nl) * | 1999-06-18 | 2000-12-22 | Skf Eng & Res Centre Bv | CVT/IVT-onderdeel. |
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EP1707831B1 (en) * | 2004-01-09 | 2012-02-01 | NTN Corporation | Thrust needle roller bearing, support structure receiving thrust load of compressor for car air-conditioner, support structure receiving thrust load of automatic transmission, support structure for nonstep variable speed gear, and support structure receiving thrust load of manual transmission |
JP2005337335A (ja) * | 2004-05-25 | 2005-12-08 | Nsk Ltd | 転がり軸受 |
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JP5202043B2 (ja) * | 2008-03-10 | 2013-06-05 | 愛知製鋼株式会社 | 転動部品及びその製造方法 |
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2011
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- 2011-03-18 EP EP11762604.4A patent/EP2554864A4/en not_active Withdrawn
- 2011-03-18 CN CN201180005471.6A patent/CN102741572B/zh active Active
- 2011-03-18 US US13/637,369 patent/US20130016938A1/en not_active Abandoned
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JP2883460B2 (ja) | 1991-03-05 | 1999-04-19 | 光洋精工株式会社 | 軸受用鋼 |
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CN104662312A (zh) * | 2012-07-16 | 2015-05-27 | 舍弗勒技术股份两合公司 | 滚动轴承元件,特别是滚动轴承环 |
CN104662312B (zh) * | 2012-07-16 | 2018-02-23 | 舍弗勒技术股份两合公司 | 滚动轴承元件,特别是滚动轴承环 |
Also Published As
Publication number | Publication date |
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JP2011208745A (ja) | 2011-10-20 |
EP2554864A4 (en) | 2013-12-04 |
CN102741572A (zh) | 2012-10-17 |
CN102741572B (zh) | 2016-06-29 |
EP2554864A1 (en) | 2013-02-06 |
US20130016938A1 (en) | 2013-01-17 |
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