公开(公告)号：US20170152457A1

公开(公告)日：2017-06-01

申请号：US15323698

申请日：2015-06-30

Applicant: NTN CORPORATION

Inventor： Ryouta KONDOU ,  Takayuki KAWAMURA ,  Hidenobu MIKAMI

IPC: C10M133/40 ,  C10M115/08 ,  C10M105/18 ,  C10M105/04 ,  F16C19/06 ,  F16C33/66

CPC classification number: C10M133/40 ,  C10M105/04 ,  C10M105/18 ,  C10M115/08 ,  C10M169/04 ,  C10M2203/024 ,  C10M2205/0285 ,  C10M2207/0406 ,  C10M2207/283 ,  C10M2207/2855 ,  C10M2215/1026 ,  C10M2215/221 ,  C10M2215/223 ,  C10N2230/02 ,  C10N2230/06 ,  C10N2230/08 ,  C10N2230/10 ,  C10N2240/02 ,  C10N2250/10 ,  F16C19/06 ,  F16C33/6633 ,  F16C2300/54

Abstract: The present invention provides a lubricant composition which can be used as a lubricant for a rolling component, the composition capable of maintaining enhanced lubrication performance over a long period of time even under high temperature conditions such as temperatures of 180° C. or higher, and a rolling bearing including the lubricant composition sealed therein. A lubricant composition-sealed bearing 1 includes a lubricant composition 7 that is sealed in the peripheries of the rolling bodies 4. The lubricant composition 7 contains a base oil and an antioxidant. The base oil is an oil mixture of an alkyl diphenyl ether oil and at least one oil selected from a poly-α-olefin oil and an ester oil, and contains the alkyl diphenyl ether oil in an amount of 50% or more by weight of the total base oil. The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline or a polymer thereof, and is contained in an amount of 0.1% to 10% by weight of the total lubricant composition.

公开(公告)号：US20240084853A1

公开(公告)日：2024-03-14

申请号：US17767891

申请日：2020-10-08

Applicant: NTN CORPORATION

Inventor： Takayuki KAWAMURA ,  Ryouta KONDOU ,  Makoto SEKI ,  Susumu YAMAJI

IPC: F16C33/66 ,  C10M107/02 ,  C10M115/08 ,  C10M169/02 ,  F16C19/18

CPC classification number: F16C33/6633 ,  C10M107/02 ,  C10M115/08 ,  C10M169/02 ,  F16C19/183 ,  F16C2326/02

Abstract: To provide an axle bearing having a low torque property and superior bearing lifetime. A hub bearing 6 is configured to rotatably support a wheel of a vehicle, and has a grease composition 10 sealed in an inner space thereof. The grease composition 10 contains a base oil and a thickener. The shear stress of the grease composition at the shear rate of 1,000-10,000 s−1 at 25° C. is 3,000 Pa or less. The viscosity of the grease composition is 1 Pas or less. The yield stress of the grease composition at 25° C. measured by a dynamic viscoelasticity analysis method using a rheometer is 1,300-3,000 Pa.

公开(公告)号：US20170146061A1

公开(公告)日：2017-05-25

申请号：US15426694

申请日：2017-02-07

Applicant: NTN CORPORATION

Inventor： Noriaki MIWA ,  Takayuki KAWAMURA ,  Yoshinori SUGISAKI ,  Motohiro ITOU

IPC: F16C33/32 ,  F16C33/58 ,  F16C33/64 ,  F16C33/34

CPC classification number: F16C33/32 ,  F16C19/52 ,  F16C33/34 ,  F16C33/58 ,  F16C33/62 ,  F16C33/64 ,  F16C2204/60 ,  F16C2240/12 ,  F16C2240/48 ,  F16C2240/70 ,  G01M13/045 ,  G01N3/32 ,  G01N3/34

Abstract: A rolling component material of the present invention is a steel material for a rolling component to be used in an environment in which hydrogen enters steel, and is a material used for a rolling component of a rolling bearing, for example, a bearing ring. In the rolling component material, a non-metallic inclusion of the steel material has a radius not greater than a radius d determined by the following formula (1) and not less than 1.0 μm, where Pmax is defined as a maximum contact surface pressure acting on a rolling surface of the rolling component, d=64729(Pmax/4)−1.441  (1).

公开(公告)号：US20180230396A1

公开(公告)日：2018-08-16

申请号：US15751860

申请日：2016-07-29

Applicant: NTN CORPORATION

Inventor： Motohiro ITO ,  Ryouta KONDOU ,  Takayuki KAWAMURA

IPC: C10M141/06 ,  C10M105/18 ,  C10M107/02 ,  C10M111/04 ,  C10M133/40 ,  C10M133/08 ,  C10M125/24 ,  C10M129/42 ,  C10M133/12 ,  C10M115/08 ,  C10M169/00 ,  F16C33/66

CPC classification number: C10M141/06 ,  C10M105/18 ,  C10M107/02 ,  C10M111/04 ,  C10M115/08 ,  C10M125/24 ,  C10M129/42 ,  C10M133/02 ,  C10M133/08 ,  C10M133/12 ,  C10M133/40 ,  C10M141/10 ,  C10M169/00 ,  C10M169/04 ,  C10M2205/0206 ,  C10M2205/0285 ,  C10M2207/0406 ,  C10M2207/127 ,  C10M2215/042 ,  C10M2215/064 ,  C10M2215/1026 ,  C10M2215/221 ,  C10M2215/26 ,  C10M2215/28 ,  C10M2215/30 ,  C10M2223/045 ,  C10N2230/06 ,  C10N2230/08 ,  C10N2230/10 ,  C10N2230/12 ,  C10N2240/02 ,  C10N2250/10 ,  F16C33/66 ,  F16C33/6633 ,  C10N2210/01 ,  C10N2210/02

Abstract: Provided is a grease composition which can be used as a lubricant for roller bearings, exhibits excellent high temperature durability and rust preventive property, and can prevent premature flaking on the rolling surface due to hydrogen embrittlement. A roller bearing 1 is obtained by sealing a grease composition 7 in the periphery of a rolling element 4, this grease composition 7 is composed of a base oil excluding an ester-based synthetic oil, a thickener, and an additive, the additive contains (a) an alkanolamine and (b) 2,2,4-trimethyl-1,2-dihydroquinoline or a polymer thereof but does not contain an organic sulfonate, and (a) and (b) are contained at from 0.1 to 10 parts by weight with respect to 100 parts by weight of a total amount of the base oil and the thickener, respectively.

公开(公告)号：US20150105304A1

公开(公告)日：2015-04-16

申请号：US14576045

申请日：2014-12-18

Applicant: NTN CORPORATION

Inventor： Hidenobu MIKAMI ,  Yosuke TAGUCHI ,  Takayuki KAWAMURA

IPC: C10M169/06

CPC classification number: C10M169/06 ,  C10M129/02 ,  C10M129/04 ,  C10M129/06 ,  C10M129/08 ,  C10M129/12 ,  C10M129/14 ,  C10M129/16 ,  C10M129/18 ,  C10M129/20 ,  C10M129/24 ,  C10M129/68 ,  C10M129/92 ,  C10M129/93 ,  C10M129/94 ,  C10M159/02 ,  C10M169/00 ,  C10M2203/1006 ,  C10M2205/0285 ,  C10M2207/024 ,  C10M2207/026 ,  C10M2207/0406 ,  C10M2207/08 ,  C10M2207/106 ,  C10M2207/124 ,  C10M2207/1256 ,  C10M2207/128 ,  C10M2207/1285 ,  C10M2207/144 ,  C10M2207/2805 ,  C10M2207/2835 ,  C10M2207/289 ,  C10M2211/063 ,  C10M2213/043 ,  C10M2213/0606 ,  C10M2213/0613 ,  C10M2213/0626 ,  C10M2215/064 ,  C10M2215/1026 ,  C10M2215/224 ,  C10M2215/2245 ,  C10M2219/0406 ,  C10M2219/044 ,  C10M2223/045 ,  C10N2220/022 ,  C10N2220/04 ,  C10N2230/02 ,  C10N2230/06 ,  C10N2230/08 ,  C10N2230/12 ,  C10N2240/02 ,  C10N2240/30 ,  C10N2250/10 ,  F16C19/06 ,  F16C33/10 ,  F16C33/104 ,  F16C33/6633 ,  F16C2361/41 ,  F16C2361/63 ,  F16C2370/38 ,  F16C2380/26 ,  F16D3/227 ,  F16D2300/06 ,  C10N2210/01 ,  C10N2210/02

Abstract: The present invention provides a grease composition or a lubricating oil composition which is capable of effectively preventing hydrogen brittleness-caused peeling from occurring on a rolling surface of a rolling bearing, is excellent in durability in a high temperature and speed operation, and can be used for a long time. A grease-packed bearing (1) has an inner ring (2), an outer ring (3), and a plurality of rolling elements (4). A sealing member (6) for sealing a grease composition (7) is provided at openings (8a) and (8b) disposed at both axial ends of the inner ring (2) and the outer ring (3). The grease composition (7) includes a base grease composed of a base oil and a thickener and an additive added to the base grease. The additive contains at least one compound selected from among plant-derived polyphenolic compounds and compounds formed by decomposition thereof. The above-described compounds include tannin, gallic acid, ellagic acid, chlorogenic acid, caffeic acid, curcumin, quercetin, and quinic acid.

Abstract translation: 本发明提供一种能够有效地防止在滚动轴承的滚动面上发生氢脆性剥离的润滑脂组合物或润滑油组合物，其耐高温性和高速运转性优异，可以使用 需很长时间。 润滑脂填充轴承（1）具有内圈（2），外圈（3）和多个滚动元件（4）。 在设置在内圈（2）和外圈（3）的两轴向端的开口（8a）和（8b）处设置用于密封润滑脂组合物（7）的密封构件（6）。 润滑脂组合物（7）包括由基础油和增稠剂组成的基础润滑剂和添加到基础油脂中的添加剂。 添加剂含有选自植物来源的多酚化合物和通过其分解形成的化合物中的至少一种化合物。 上述化合物包括单宁，没食子酸，鞣花酸，绿原酸，咖啡酸，姜黄素，槲皮素和奎尼酸。

公开(公告)号：US20230090287A1

公开(公告)日：2023-03-23

申请号：US17794250

申请日：2021-01-15

Applicant: NTN CORPORATION

Inventor： Takayuki KAWAMURA

IPC: F16C33/66

Abstract: To provide a grease composition that is capable of effectively preventing an early-flaking caused by hydrogen embrittlement, and a grease-sealed bearing in which the grease composition is sealed. A grease composition 7 contains a base oil, a thickener, and an additive. The additive contains sodium molybdate, and zinc alkyldithiophosphate having a 1-30 C primary alkyl group. The grease composition contains 0.1-5 mass % of the sodium molybdate relative to the whole of the grease composition. The grease composition contains 0.1-5 mass % of the zinc alkyldithiophosphate relative to the whole of the grease composition.

公开(公告)号：US20160160923A1

公开(公告)日：2016-06-09

申请号：US14905948

申请日：2014-07-18

Applicant: NTN CORPORATION

Inventor： Takayuki KAWAMURA ,  Motohiro ITO

IPC: F16C33/66 ,  C10M105/04 ,  C10M115/08 ,  C10M105/18 ,  C10M133/08 ,  C10M169/04 ,  C10M105/32

CPC classification number: F16C33/6633 ,  C10M105/04 ,  C10M105/18 ,  C10M105/32 ,  C10M115/08 ,  C10M133/08 ,  C10M169/04 ,  C10M2203/1006 ,  C10M2205/0285 ,  C10M2207/0406 ,  C10M2207/2805 ,  C10M2215/042 ,  C10M2215/064 ,  C10M2215/1026 ,  C10M2223/045 ,  C10N2220/022 ,  C10N2230/06 ,  C10N2230/40 ,  C10N2240/02 ,  C10N2250/10 ,  F16C19/06 ,  F16C2360/46 ,  F16C2361/61 ,  F16C2361/63 ,  F16C2380/26 ,  C10N2210/02

Abstract: A rolling bearing that can prevent peeling on a surface of an iron-based metal member by hydrogen brittleness even under a severe environment is provided. The rolling bearing 1 has plural bearing elements formed of an iron-based metal, and a lubricant composition 7 that lubricates metal contact surfaces of the respective bearing elements, the lubricant composition 7 is a grease containing a base oil and alkanolamine and being free of alkali metal salts and alkaline earth metal salts of inorganic acids, the base oil is at least one oil selected from alkyl diphenyl ether oils, poly-α-olefin oils and ester oils, and the alkanolamine is contained by 0.1 to 10 parts by weight with respect to 100 parts by weight of the total amount of the base oil and a thickener.

Abstract translation: 提供即使在恶劣的环境下也能够防止由于氢脆而在铁基金属构件的表面上剥离的滚动轴承。 滚动轴承1具有由铁基金属形成的多个轴承元件和润滑各轴承元件的金属接触表面的润滑剂组合物7，润滑剂组合物7是含有基础油和链烷醇胺并且不含碱的润滑脂 无机酸的金属盐和碱土金属盐，基油是选自烷基二苯基醚油，聚-α-烯烃油和酯油中的至少一种油，链烷醇胺的含量相对于 至100重量份的基础油和增稠剂的总量。

公开(公告)号：US20220204881A1

公开(公告)日：2022-06-30

申请号：US17605570

申请日：2020-04-20

Applicant: NTN CORPORATION

Inventor： Ryouta KONDOU ,  Takayuki KAWAMURA

IPC: C10M135/10 ,  C10M137/10 ,  C10M117/02 ,  C10M117/06 ,  C10M169/06 ,  F16C19/36 ,  F16C19/38 ,  F16C33/66

Abstract: To provide a grease composition for a tapered roller bearing having superior bearing lifetime under a condition of high temperature and a condition of high load, and a tapered roller bearing in which the grease composition for the tapered roller bearing is filled. A tapered roller bearing 11 includes an inner ring 12 having a raceway surface 12a, an outer ring 13 having a raceway surface 13a and a plurality of tapered rollers 14, and a flange part of the inner ring 12 gets into sliding contact with the tapered rollers 14. Grease 16 is filled around the tapered rollers 14. The grease 16 includes a base oil, a thickener and an additive. A frequency in which a storage modulus, which varies depending on frequency, of the grease 16 becomes minimum is equal to 7 Hz or more.

公开(公告)号：US20200340530A1

公开(公告)日：2020-10-29

申请号：US16923451

申请日：2020-07-08

Applicant: NTN CORPORATION

Inventor： Noriaki MIWA ,  Takayuki KAWAMURA ,  Yoshinori SUGISAKI ,  Motohiro ITOU

IPC: F16C33/32 ,  F16C33/34 ,  F16C33/64 ,  F16C19/52 ,  F16C33/62 ,  G01M13/045 ,  F16C33/58

Abstract: A method for selecting a steel material for a rolling component to be used in an environment in which hydrogen enters steel. The method includes determining a maximum contact surface pressure Pmax acting on a rolling surface of the rolling component, and using, as a material for the rolling component, a material whose inclusion has a radius not greater than a radius d determined by the following formula (1) and not less than 1.0 μm, d=64729(Pmax/4)−1.441   (1).

公开(公告)号：US20180079988A1

公开(公告)日：2018-03-22

申请号：US15559413

申请日：2016-03-09

Applicant: NTN CORPORATION

Inventor： Masaharu INOUE ,  Kazuhiro WATANABE ,  Tomoyoshi IZUTSU ,  Takayuki KAWAMURA ,  Hiroyuki AMARI ,  Minoru HASEGAWA ,  Kouhei NAKANO

IPC: C10M169/00 ,  C10M105/36 ,  C10M101/00 ,  C10M111/02 ,  C10M115/08 ,  C10M125/10 ,  C10M139/00 ,  C10M141/12

Abstract: It is an object of the present invention to provide a grease composition, for an outer ring rotation type rolling bearing, which is capable of satisfying all of high-temperature durability, low-temperature property, peeling resistance, and rust-preventive property. A grease composition (7) to be enclosed in the outer rig rotation type rolling bearing for use in automotive electric auxiliary machines contains base oil, a thickener, a peeling-resistant additive, a wear-resistant additive, and a rust-preventive agent. The base oil is mixed oil of trimellitic acid ester oil and synthetic hydrocarbon oil mixed therewith in a mass ratio of (70:30) to (90:10). The thickener consists of a diurea compound shown by a formula (1). R1—NHCONH—R2—NHCONH—R1  (1) wherein a reference symbol R2 denotes a divalent aromatic hydrocarbon group having a carbon number of 6 to 15, and a reference symbol R1 denotes a cyclohexyl group.