公开(公告)号：JP2005114147A

公开(公告)日：2005-04-28

申请号：JP2003352991

申请日：2003-10-10

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： OKI TSUTOMU ,  MAEDA KIKUO

IPC: F16C33/62 ,  C23C8/32 ,  F16C33/32 ,  F16C33/34

Abstract: PROBLEM TO BE SOLVED: To provide a rolling bearing having high cracking strength resistance and dimensional stability and superior rolling fatigue life.
SOLUTION: The rolling bearing 10 comprises an outer ring 1, an inner ring 2, a plurality of rolling bodies 3. At least one member of the outer ring 1, the inner ring 2 and the rolling body 3 has a nitrogen enriched layer, austenite crystal grains in a range exceeding No.10 in the grain size number, and hardness of Hv 700 or greater.
COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：提供具有高抗裂性和尺寸稳定性以及优异的滚动疲劳寿命的滚动轴承。 解决方案：滚动轴承10包括外圈1，内圈2，多个滚动体3.外圈1，内圈2和滚动体3的至少一个构件具有富氮 层状奥氏体晶粒的粒径在超过10的范围内，Hv的硬度为700以上。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2005113257A

公开(公告)日：2005-04-28

申请号：JP2003352999

申请日：2003-10-10

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： OKI TSUTOMU ,  MAEDA KIKUO

IPC: F16C33/32 ,  C21D9/40 ,  C22C38/00 ,  C22C38/18 ,  F16C33/34 ,  F16C33/64

Abstract: PROBLEM TO BE SOLVED: To provide rolling bearings which have high cracking resistance, dimensional stability and the superior rolling-fatigue life.
SOLUTION: The rolling bearings 10 comprise an outer ring 1, an inner ring 2 and a plurality of rolling elements 3. At least one member among the outer ring 1, the inner ring 2 and the rolling elements 3 is formed from a steel comprising, by wt.%, 0.4-0.8% C, 0.4-0.9% Si, 0.7-1.3% Mn, 0.5% or less Cr and the balance Fe with unavoidable impurities; has a nitrogen-enriched layer; and has an austenitic grain size exceeding 10 by a size number in the nitrogen-enriched layer.
COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：提供具有高抗开裂性，尺寸稳定性和优异的滚动疲劳寿命的滚动轴承。 解决方案：滚动轴承10包括外圈1，内圈2和多个滚动元件3.外圈1，内圈2和滚动元件3中的至少一个构件由 钢，以重量％计含有0.4-0.8％C，0.4-0.9％Si，0.7-1.3％Mn，0.5％或更少的Cr，余量为不可避免的杂质; 具有富氮层; 并且在富氮层中奥氏体晶粒尺寸超过10。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2005113218A

公开(公告)日：2005-04-28

申请号：JP2003349680

申请日：2003-10-08

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： NAKAJIMA HIROKAZU ,  MAEDA KIKUO

IPC: C21D1/00 ,  C21D1/06 ,  C21D9/40

Abstract: PROBLEM TO BE SOLVED: To strictly control the heating temperature at a secondary heat treatment time, in the heat treatment system in which a nitrogen-rich layer is formed in primary heat treatment and quenching is applied in the secondary heat treatment, at a lower temperature than the heating temperature in the primary heat treatment.
SOLUTION: In a primary heat treatment apparatus 1, after heating bearing parts to the temperature exceeding A
1 transformation point with a heating machine 11, nitrogen-rich layer is formed on the surfaces of the bearing parts by cooling them lower than the A
1 transformation point. Successively, the bearing parts are shifted into a secondary heat treatment apparatus 2, and after heating to the temperature exceeding the A
1 transformation point and lower than a primary quenching temperature, the parts are cooled lower than the A
1 transformation point. The secondary heating temperature is controlled by detecting the temperature of the bearing parts with a non-contacting sensor 5 in a heating machine 21 set in the secondary heat treatment apparatus 2.
COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：为了在二次热处理时间严格控制加热温度，在二次热处理中，在一次热处理中形成富氮层的热处理系统中进行淬火，在 比一次热处理中的加热温度低。 解决方案：在一次热处理装置1中，通过加热机11将轴承部件加热到超过A 1 相变点的温度后，在轴承表面上形成富氮层 通过将它们冷却到低于A 1 变换点的部件。 接着，将轴承部件移动到二次热处理装置2中，在加热到超过A 1 相变点并低于初级淬火温度的温度后，将部件冷却至低于A 1 转换点。 通过在设置在二次热处理装置2中的加热机21中用非接触传感器5检测轴承部件的温度来控制二次加热温度。（C）2005，JPO＆NCIPI

公开(公告)号：JP2004293632A

公开(公告)日：2004-10-21

申请号：JP2003085309

申请日：2003-03-26

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： MAEDA KIKUO ,  FUJII YUKIO

IPC: C21D1/06 ,  C21D9/40 ,  F01L1/18 ,  F16C19/24 ,  F16C33/62 ,  F16C33/64 ,  F16H53/06

CPC classification number: F16C33/62 ,  F01L1/181 ,  F01L2101/00 ,  F01L2103/00 ,  F01L2105/00 ,  F16C33/64 ,  F16C2240/18 ,  F16C2360/18 ,  Y10T29/49679

Abstract: PROBLEM TO BE SOLVED: To provide an inexpensive rolling bearing that can be used stably for a long time even in applications where lubrication conditions are strict, or bending stress operates. SOLUTION: An inner ring 5 and an outer ring 6 of the rolling bearing 1 built into a locker arm 4 in automobiles are formed by high-carbon chromium bearing steels, heat treatment is made by high-frequency hardening after high-temperature tempering once after carbonitriding treatment, thus material change resistivity and at least 200 MPa compression stress are given to the surface layer, material costs are made equivalent as compared with before, and a rolling fatigue life and crack fatigue strength are drastically improved. Therefore, although the bearing 1 is in a full roller type and lubrication conditions easily deteriorate and the outer ring 6 receives repetitive bending stress from a cam 3, the bearing 1 can be used stably for a long time. COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2004183804A

公开(公告)日：2004-07-02

申请号：JP2002352250

申请日：2002-12-04

Applicant: Ntn Corp ,  Ntn株式会社

Inventor： OKI TSUTOMU ,  MAEDA KIKUO

IPC: F04C29/00 ,  C21D1/06 ,  C21D1/18 ,  C21D9/40 ,  C22C38/00 ,  F04C18/02 ,  F16C19/12 ,  F16C33/62 ,  F16C33/64

CPC classification number: F16C2360/42

Abstract: PROBLEM TO BE SOLVED: To provide a thrust ball bearing, and a method for manufacturing the same, including a member, in which heat treatment deformation is restricted, while prescribed hardness is secured.
SOLUTION: This thrust ball bearing is provided with a race member 11 on which rolling elements 12 roll. Steel material to form at least the race member among members to compose it is quenched and hardened by atmospheric radiation (cooling by air). A surface layer part of the quenched and hardened member has hardness of HV650 or more.
COPYRIGHT: (C)2004,JPO&NCIPI