公开(公告)号：JP2004301342A

公开(公告)日：2004-10-28

申请号：JP2004225969

申请日：2004-08-02

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： TAMADA KENJI ,  MAEDA KIKUO ,  KAWAMURA TOMOAKI ,  SASABE MITSUO

IPC: F16C33/34 ,  F16C19/30 ,  F16C33/48

CPC classification number: F16C19/30 ,  F16C33/4635 ,  F16C33/48 ,  F16C33/54 ,  F16C2240/50

Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method for a thrust roller bearing for reducing differential slide and friction wear and providing long service life in resistance to peeling-off.
SOLUTION: This manufacturing method comprises a process for forming the holder having the pocket 3 storing double rows of rollers 2 and a process for arranging all of the double rows of rollers in the pocket as rollers 2a with crowning to reduce differential slide, although contact face pressure rises above contact face pressure applied on each roller when all of the double rows of rollers are straight rollers.
COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2004137553A

公开(公告)日：2004-05-13

申请号：JP2002303036

申请日：2002-10-17

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  FUJII YUKIO ,  ICHIKAWA KENICHI

IPC: F16C33/34 ,  C21D1/06 ,  C21D9/40 ,  C23C8/30 ,  C23C8/32 ,  F01L1/18 ,  F16C33/30 ,  F16C33/62

Abstract: PROBLEM TO BE SOLVED: To provide a whole roller type rolling bearing, which can be adapted to tendency of a high speed and a heavy load in application and a low viscosity of a lubricating oil.
SOLUTION: This rolling bearing comprises an outer ring 4, an inner ring 2 and a roller 3 all made of steel, wherein at least one of the outer ring, the inner ring and the roller is provided with a carbonitriding layer on the surface layer, and the grain sizes of the austenitic crystals on the surface layer are a specified value or larger.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2004060807A

公开(公告)日：2004-02-26

申请号：JP2002221574

申请日：2002-07-30

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  OKI TSUTOMU ,  FUJII YUKIO ,  ICHIKAWA KENICHI

IPC: F01L1/18 ,  C21D1/06 ,  C21D9/40 ,  C23C8/22 ,  C23C8/32 ,  F16C19/26 ,  F16C33/64

Abstract: PROBLEM TO BE SOLVED: To provide a product with high strength and long service life by increasing occurrence load of impression or crack when impact load and big load act on an outer ring, in a bearing where the outer periphery of the outer ring rotates while rolling and contacting with a partner cam or a guiding surface. SOLUTION: The bearing comprises the outer ring 4, a rolling element 3, and an inner ring 2. In addition to a rolling surface disposed inside surrounded with the outer ring, the outer peripheral surface of the outer ring is used as the rolling surface. A compressive stress is formed in a surface layer section of the rolling surface at least inside the outer ring. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：为了提供具有高强度和长使用寿命的产品，当冲击载荷和大负荷作用在外圈上时，增加印模或裂纹的发生负荷，在外圈的外周 在滚动并与配对凸轮或引导表面接触的同时旋转。

解决方案：轴承包括外圈4，滚动元件3和内圈2.除了设置在外环周围的滚动表面之外，外圈的外周表面用作 滚动面。 至少在外圈的内侧，在滚动面的表层部形成压缩应力。 版权所有（C）2004，JPO

公开(公告)号：JP2003342686A

公开(公告)日：2003-12-03

申请号：JP2002149428

申请日：2002-05-23

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： FUJII YUKIO ,  MAEDA KIKUO

IPC: B60B27/00 ,  C21D1/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  F16C33/30 ,  F16C33/32 ,  F16C33/62

CPC classification number: C22C38/18 ,  B60B27/00 ,  C21D1/10 ,  C22C38/02 ,  C22C38/04 ,  F16C33/30 ,  F16C33/32 ,  F16C33/62 ,  F16C2326/02 ,  Y02P10/253

Abstract: PROBLEM TO BE SOLVED: To provide a rolling part which has an extended life as long as that of ball bearing steel and is prepared by using steel of a medium carbon steel level improved in the characteristics of preventing the occurrence of surface cracks; and a power transmission part including the rolling part. SOLUTION: The rolling part is made of steel of which the lower limit ΔKth of the stress intensity factor ranges corresponding to the progress of tensile fatigue crack in an induction-hardened section is 6.2 MPa√m or higher. COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：提供一种延长使用寿命与滚珠轴承钢一样长的滚动部件，并且通过使用中等碳钢水平的钢来制备，其改善了防止表面裂纹发生的特性; 以及包括滚动部的动力传递部。 解决方案：滚动部件由与感应淬火部的拉伸疲劳裂纹的进行对应的应力强度因子范围的下限ΔKth为6.2MPa以上的钢制成。 版权所有（C）2004，JPO

公开(公告)号：JP2013167005A

公开(公告)日：2013-08-29

申请号：JP2012031818

申请日：2012-02-16

Applicant: Ntn Corp ,  Ntn株式会社 ,  Nippon Steel & Sumitomo Metal Corp ,  新日鐵住金株式会社

Inventor： MAEDA KIKUO ,  KAWAKITA MASAYUKI ,  KUBOTA MANABU ,  OZAWA SHUJI

IPC: C22C38/00 ,  C21D1/06 ,  C21D9/40 ,  C22C38/18 ,  C23C8/22 ,  C23C8/32 ,  F16C19/06 ,  F16D3/2245

CPC classification number: C21D1/06 ,  C21D6/00 ,  C21D9/40 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/22 ,  C22C38/42 ,  C22C38/44 ,  C23C8/32 ,  F16C19/06 ,  F16C33/32 ,  F16C33/62 ,  F16C33/64 ,  F16C2204/62 ,  F16D3/20 ,  F16D2300/10

Abstract: PROBLEM TO BE SOLVED: To provide a rolling contact part which has characteristics equal to or more than those of a part made from SCM 420 while adopting a material free from Mo, and a rolling bearing.SOLUTION: An outer ring 11, an inner ring 12, and a ball 13 are formed from a steel containing 0.15 mass% or more and 0.25 mass% or less of carbon; 0.45 mass% or more and 0.55 mass% or less of silicon; 1.05 mass% or more and 1.15 mass% or less of manganese; and 1.40 mass% or more and 1.50 mass% or less of chromium, with the balance being iron and impurities respectively, and the surfaces thereof respectively have an outer ring rolling surface 11A, an inner ring rolling surface 12A and a ball contact surface 13A to make rolling contact with other members. An outer ring carburized layer 11B, an inner ring carburized layer 12B and a ball carburized layer 13B are formed respectively so as to include the outer ring rolling surface 11A, inner ring rolling surface 12A and ball contact surface 13A.

Abstract translation: 要解决的问题：提供一种滚动接触部件，其具有等于或大于由SCM 420制成的部件的特性，同时采用不含Mo的材料和滚动轴承。解决方案：外圈11，内圈 12，球13由含有0.15质量％以上且0.25质量％以下的碳的钢形成， 0.45质量％以上且0.55质量％以下的硅; 1.05质量％以上且1.15质量％以下的锰; 和1.40质量％以上且1.50质量％以下的铬，其余为铁和杂质，其表面分别具有外圈滚动面11A，内圈滚动面12A和滚珠接触面13A〜 与其他会员滚动联系。 分别形成外圈渗碳层11B，内圈渗碳层12B和球渗碳层13B，以包括外圈滚动表面11A，内圈滚动表面12A和球接触表面13A。

公开(公告)号：JP2009235444A

公开(公告)日：2009-10-15

申请号：JP2008079995

申请日：2008-03-26

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO

IPC: C21D6/00 ,  C21D1/06 ,  C21D9/36 ,  C21D9/40 ,  C22C38/00 ,  C22C38/04 ,  C22C38/22 ,  C23C8/32 ,  F16C33/62 ,  F16C33/64

Abstract: PROBLEM TO BE SOLVED: To provide a method for applying a heat-treatment for a steel by which the restraint of the hardness-lowering in the semi-high temperature atmosphere and the improvements of a dimensional stability and the hardness level can be obtained; a method for manufacturing a machine part, the machine part and a rolling bearing containing this machine part. SOLUTION: This method for applying the heat-treatment for the steel, is provided with; a process for preparing the steel composed of 0.4- 1 point; and a process for transforming the nitrogen-enriched layer into a bainite so that retained austenitic layer quantity in the nitrogen-enriched layer becomes ≤5vol% by holding the temperature exceeding Ms point of the nitrogen-enriched layer and the temperature ≤50°C higher from the Ms point. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为了提供一种对半导体制冷剂中的硬度降低的限制以及尺寸稳定性和硬度水平的提高进行钢的热处理的方法 获得; 机器部件的制造方法，机器部件和包含该机器部件的滚动轴承。

解决方案：提供用于钢的热处理的方法; 制备由0.4-0.7质量％碳，0.15-0.35质量％硅，0.6-1.3质量％锰和余量的铁与杂质组成的钢的方法; 通过在≥A 1 点的温度下对该钢进行碳氮化，在含有钢表面的范围内形成富氮层的方法; 以及将富氮层转化为贝氏体的方法，通过将富氮层的温度保持在Ms点以上且温度≤50℃以上，使富氮层中的残留奥氏体层的含量变为≤5vol％ 从Ms点。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2009035822A

公开(公告)日：2009-02-19

申请号：JP2008215576

申请日：2008-08-25

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  KAWAKITA MASAYUKI

IPC: C21D1/10 ,  C21D9/40 ,  C22C38/00 ,  C22C38/18

CPC classification number: Y02P10/253

Abstract: PROBLEM TO BE SOLVED: To provide a high frequency hardening method capable of obtaining high durability in rolling fatigue or the like by micronizing the micro-structure and obtaining a high surface hardness, and steel parts. SOLUTION: The high frequency hardening method comprises a process of hardening steel parts by high-frequency heating, and a process of performing a high frequency-heating beyond point A 3 and cooling to transformation point A 1 or lower, which is performed at least one time before the above hardening process. Furthermore, it comprises, in the high-frequency heating beyond the point A 3 before the hardening process, a process of holding the steel parts within a temperature region beyond the point A 3 for a prescribed time or longer, then cooling the steel parts to the transformation point A 1 or lower as they are. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：提供一种能够通过微细化微结构并获得高表面硬度而获得高耐磨性的高频硬化方法和钢部件。 解决方案：高频淬火方法包括通过高频加热对钢部件进行硬化的工序，以及进行超过点A 3 的高频加热并冷却至相变点A的工序 1 或更低，其在上述硬化过程之前至少进行一次。 此外，在硬化处理之前，其包括超过点A 3 的高频加热，将钢部件保持在超过点A <3>的温度区域 >规定时间以上，然后将钢部件原样冷却至相变点A 1 以下。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2009007614A

公开(公告)日：2009-01-15

申请号：JP2007169093

申请日：2007-06-27

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  TAMADA KENJI

IPC: C22C38/00 ,  C21D1/06 ,  C21D9/40 ,  C22C38/46 ,  C22C38/50 ,  C23C8/32 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62

Abstract: PROBLEM TO BE SOLVED: To provide a rolling member and a rolling bearing for a transmission, which exhibit the long life under harsh environments while reducing a content of an alloying element. SOLUTION: An outer race 11, an inner race 12 and a ball 13 of a deep groove ball bearing 1 are made of a steel which comprises 0.7 to 1.1% carbon, 0.3 to 0.7% silicon, 0.3 to 0.8% manganese, 0.5 to 1.2% nickel, 1.3 to 1.8% chromium, 0.1 to 0.7% molybdenum, 0.2 to 0.4% vanadium and the balance iron with impurities, while controlling a total content of silicon and manganese to 1.0% or less, a total content of nickel and chromium to 2.3% or more and a total content of chromium, molybdenum and vanadium to 3.0% or less; and have a layer containing high carbon formed on their surfaces. The surface layer part of the layer has a hardness of 725 to 800 HV. The maximum particle size of carbides dispersed in the surface layer part is 10 μm or smaller and the area ratio thereof is 7 to 20% or less. The surface layer part includes more carbon than the inner part by 0.2 to 0.4%, and includes nitrogen of 0.1 to 0.5 mass%. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：提供一种用于变速器的滚动部件和滚动轴承，其在减少合金元素的含量的同时在恶劣环境下表现出长寿命。 解决方案：深沟球轴承1的外圈11，内圈12和球13由钢制成，其包括0.7-1.1％的碳，0.3-0.7％的硅，0.3到0.8％的锰， 0.5〜1.2％的镍，1.3〜1.8％的铬，0.1〜0.7％的钼，0.2〜0.4％的钒和余量的铁与杂质，同时将硅和锰的总含量控制在1.0％以下，镍的总含量 铬至2.3％以上，铬，钼，钒的总含量为3.0％以下; 并且在其表面上形成含有高碳的层。 该层的表层部分具有725至800HV的硬度。 分散在表面层部分中的碳化物的最大粒径为10μm以下，面积比为7〜20％以下。 表层部分的碳含量比内部多0.2〜0.4％，氮含量为0.1〜0.5质量％。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2008285725A

公开(公告)日：2008-11-27

申请号：JP2007131960

申请日：2007-05-17

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO

IPC: C22C38/00 ,  C21D1/06 ,  C21D9/40 ,  C22C38/46 ,  C22C38/50 ,  C23C8/22 ,  C23C8/32 ,  F16C33/32 ,  F16C33/34 ,  F16C33/62

Abstract: PROBLEM TO BE SOLVED: To provide a rolling member that has the long life even in a high-temperature environment and an environment into which water enters, while having a controlled content of an alloy element; a rolling bearing; and a method for manufacturing the rolling member. SOLUTION: An outer ring 11, an inner ring 12 and a ball 13 which compose a deep groove ball bearing 1 are formed of a steel material comprising 0.3 to 0.4% carbon, 0.3 to 0.7% silicon, 0.3 to 0.8% manganese, 0.5 to 1.2% nickel, 1.6 to 2.5% chromium, 0.1 to 0.7% molybdenum, 0.2 to 0.4% vanadium, while controlling the contents of silicon + manganese, nickel + chromium and chromium + molybdenum + vanadium to 1.0% or less, 2.3% or more and 3.0% or less respectively, and the balance iron with impurities; and have a hardened layer formed thereon. The hardened layer has such a surface layer that hardness is 725 to 800 HV, and carbides have the maximum particle size of 10 μm or smaller and occupy 7 to 25% or less by an area rate; and has an inner part in which hardness is 450 to 650 HV. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：提供即使在高温环境和水进入的环境中也具有长寿命的滚动件，同时具有受控的合金元素含量; 滚动轴承; 以及滚动体的制造方法。 解决方案：构成深沟球轴承1的外圈11，内圈12和球13由含有0.3-0.4％碳，0.3-0.7％硅，0.3-0.8％锰， ，0.5〜1.2％的镍，1.6〜2.5％的铬，0.1〜0.7％的钼，0.2〜0.4％的钒，同时将硅+锰，镍+铬和铬+钼+钒的含量控制在1.0％以下，2.3 ％以上且3.0％以下，余量为杂质铁; 并且在其上形成有硬化层。 硬化层具有硬度为725〜800HV的表面层，碳化物的最大粒径为10μm以下，面积率为7〜25％以下。 并且具有其中硬度为450至650HV的内部部件。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2008208857A

公开(公告)日：2008-09-11

申请号：JP2007043758

申请日：2007-02-23

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  OTSUKI HISASHI

IPC: F16C19/38 ,  B60B27/00 ,  B60B35/18 ,  F16C35/067

CPC classification number: B60B27/0084 ,  B60B27/001 ,  B60B27/0026 ,  F16C19/386 ,  F16C35/063 ,  F16C2326/02

Abstract: PROBLEM TO BE SOLVED: To provide a bearing device for a wheel having high durability achieved by using a component having a non-hardened portion with increased fatigue strength. SOLUTION: The bearing device 1 for the wheel has an outer member 10, an inner member 20 and rollers 50. The inner member 20 is made of steel and includes a hub ring 30 on which a wheel installation flange 31 is formed. The hub ring 30 has a hardened section 39 hardened to the hardness of 50 HRC or higher by quenching, and also has a non-hardened section 33 that is the section other than the hardened section 39. The ferrite area ratio of steel forming the non-hardened section 33 is 3% or less. COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：提供一种具有通过使用具有增加的疲劳强度的非硬化部分的部件实现的具有高耐久性的车轮的轴承装置。 解决方案：用于车轮的轴承装置1具有外部构件10，内部构件20和辊50.内部构件20由钢制成并且包括轮毂环30，轮环安装凸缘31形成在轮毂环30上。 轮毂环30具有通过淬火硬化至硬度为50HRC或更高的硬化部分39，并且还具有作为除硬化部分39之外的部分的非硬化部分33.形成非硬化部分的钢的铁素体面积比 硬化部33为3％以下。 版权所有（C）2008，JPO＆INPIT