Patents Assigned to Kyodo Yushi Co., Ltd.
  • Patent number: 10377964
    Abstract: The invention provides a magneto-rheological grease composition which contains (a) a base oil including at least 30% by mass of an ether type synthetic oil; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition. The magneto-rheological grease composition can show superior thermal stability, dispersion stability and magneto-rheological properties.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: August 13, 2019
    Assignees: KYODO YUSHI CO., LTD., YOKOHAMA NATIONAL UNIVERSITY
    Inventors: Hiroshi Kimura, Shinya Kondo, Tetsuo Ogawa, Makoto Hayama, Koji Maesaka, Shin Morishita, Ken Nakano, Toshihiko Shiraishi
  • Publication number: 20190218474
    Abstract: A grease composition includes a base oil, a thickener, and an additive. The base oil contains a synthetic oil. The thickener contains a compound having a urea group. The additive contains a phosphoric compound, a calcium-based compound, and a hydrocarbon-based wax. A hub unit includes the grease composition enclosed therein.
    Type: Application
    Filed: September 28, 2016
    Publication date: July 18, 2019
    Applicants: JTEKT CORPORATION, KYODO YUSHI CO., LTD.
    Inventors: Koji YOSHIZAKI, Hiroshi INUKAI, Yoichiro SANKAI, Shinji YAMANE, Hideo SHIBATA, Hirofumi INOUE, Ryuji NAKATA, Junichi IMAI, Yutaka IMAI, Ryosuke SAITO, Yuta SATO
  • Patent number: 10336964
    Abstract: The invention provides a grease composition suitable for being packed in roll bearings to be lubricated at elevated temperatures and a bearing in which the above-mentioned grease composition is packed. In the grease composition containing a base oil, a urea-containing thickener and an additive, the additive includes an overbased metal sulfonate and the amount of the overbased metal sulfonate is 0.05 to 1.00 mass % with respect to the total amount of the grease composition. The bearing has the above-mentioned grease composition sealed therein.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: July 2, 2019
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Yutaka Imai, Yuji Onuki
  • Publication number: 20190185780
    Abstract: A grease composition comprises a thickener, a base oil, and a friction modifier. The friction modifier comprises: at least one selected from the group consisting of fatty acids, fatty acid metal salts, phosphate esters, thiophosphate esters, and zinc dithiophosphates; and a polyhydric alcohol ester.
    Type: Application
    Filed: July 26, 2017
    Publication date: June 20, 2019
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Ryosuke SAITO, Yuta SATO, Iwaki HIROOKA
  • Publication number: 20190177645
    Abstract: The present invention provides a grease composition comprising (a) a base oil, (b) a thickener comprising a urea compound, (c) an amine antioxidant at 0.5 to 5% by mass based on a total mass of the composition, and (d) a quinoline antioxidant at 0.5 to 5% by mass based on the total mass of the composition.
    Type: Application
    Filed: August 4, 2017
    Publication date: June 13, 2019
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Iwaki HIROOKA, Yuta SATO, Masatoshi IJIMA
  • Patent number: 10280382
    Abstract: The invention provides a lubricating oil for fluid dynamic bearing including as a base oil a monoester oil free of unsaturated bond, and having an absolute viscosity of 2.0 to 3.0 mPa·s at 100° C. a viscosity index of 130 or more and a pour point of ?20° C. or less.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: May 7, 2019
    Assignees: KYODO YUSHI CO., LTD., NIDEC CORPORATION
    Inventors: Iwaki Hirooka, Takayuki Oe, Sayuri Tsubata, Yuji Hagiwara
  • Publication number: 20190062664
    Abstract: Provided is a grease composition for a magnet clutch of an automobile, including: a base oil; and a thickener, wherein the composition contains 5% by mass or more of a sulfur content in terms of sulfur element relative to a total mass of the composition.
    Type: Application
    Filed: July 5, 2018
    Publication date: February 28, 2019
    Applicants: Kyodo Yushi Co., Ltd., Denso Corporation
    Inventors: Shozo Ikejima, Iwaki Hirooka, Yutaka Imai, Ryosuke Ichimura, Kazuki Isa, Yusuke Asada, Kyoji Inukai, Hiromasa Tanaka, Masashi Tobayama, Toshizo Watanabe
  • Publication number: 20190055491
    Abstract: The present invention provides a grease composition including a thickener and a base oil, in which the thickener is a urea compound represented by the following formula (1) R1—NHCONH—R2—NHCONH—R3 ??(1) wherein R2 represents a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 may be the same or different and each represent an alkyl group having 8 to 22 carbon atoms, a cyclohexyl group, or an aryl group having 6 to 12 carbon atoms, and as the base oil, one or more types of a compound represented by the following formula (2) are contained at 40% by mass or more relative to a total mass of the base oil wherein R4 and R5 may be the same or different and each represent a linear or branched alkyl group having 10 to 26 carbon atoms, where m and n are real numbers being 0 or more which satisfy m+n=2.
    Type: Application
    Filed: March 8, 2017
    Publication date: February 21, 2019
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Terasu Yoshinari, Tomonobu Komoriya, Yuki Takeyama
  • Publication number: 20180340128
    Abstract: There is provided a press-fit lubricant composition comprising an unsaturated compound with an iodine value of 100 or more.
    Type: Application
    Filed: April 27, 2018
    Publication date: November 29, 2018
    Applicants: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Takahiro NIHIRA, Hiroyuki ISHIKAWA, Masanori KOMABA, Shozo IKEJIMA, Yusuke ASADA, Takahiro NOZU, Takumi SHIOMI, Kyoji INUKAI
  • Patent number: 10081778
    Abstract: The invention provides a grease composition for hub unit bearing, having (a) as a base oil a mixture of a hydrocarbon synthetic oil and an ester type synthetic oil, with the content of the ester type synthetic oil being 20 to 50 parts by mass with respect to 100 parts by mass of the total of the hydrocarbon synthetic oil and the ester type synthetic oil, and the base oil having a kinematic viscosity at 40° C. of 20 to 80 mm2/s, and (b) as a thickener a urea compound.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: September 25, 2018
    Assignees: KYODO YUSHI CO., LTD., HONDA MOTOR CO., LTD.
    Inventors: Daisuke Tsutsui, Yuta Sato, Junichi Imai, Morinobu Kawamura
  • Patent number: 10077411
    Abstract: The invention provides a grease composition containing a base oil, a thickener, and an anti-flaking additive such as a compound represented by, for example, formula (1-1), which grease composition can prevent the white layer flaking of the rolling bearings. (In the formula, R1 and R4 are each independently a straight-chain or branched alkyl or alkenyl group having 1 to 20 carbon atoms.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: September 18, 2018
    Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Terasu Yoshinari, Tomonobu Komoriya, Iwaki Hirooka, Masataka Muto, Satoru Nakazawa, Yoshinori Fukushima, Shigeyuki Mori
  • Publication number: 20180216025
    Abstract: The invention provides a grease composition for rolling bearings that can exhibit improved bearing life that can secure the low noise performance under high temperature conditions, and a rolling bearing where the above-mentioned grease composition is enclosed. The grease composition for rolling bearings includes a base oil, a urea thickener and a metal deactivator. The base oil has an aniline point of 110° C. or more. The urea thickener is at least one kind of diurea compound selected from the group consisting of diurea compounds represented by formula (1): R1—NHCONH—R2—NHCONH—R3 (wherein R1 and R3, which may be the same or different from each other represent a C6-30alkyl group, a C5-8cycloalkyl group or a C6-10aryl group, and R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms.
    Type: Application
    Filed: October 22, 2015
    Publication date: August 2, 2018
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: MASAMICHI YAMAMOTO, NORIKO TANAKA, KENICHIRO MATSUBARA
  • Patent number: 10005980
    Abstract: A grease is provided which has an improved inflow property of the grease into a lubrication unit and has a long life when used for bearings even under a high temperature environment. A grease composition comprising a base oil and a thickener, characterized in that the base oil contains an ester synthetic oil, the content of the ester synthetic oil is not less than 20% by mass of the total mass of the base oil and the thickener contains a diurea compound represented by the Formula (I): R1—NHCONH—R2—NHCONH—R3,??(I) wherein R2 is a C6-15 divalent aromatic hydrocarbon group, R1 and R3 are the same or different, and represent cyclohexyl or C8-22 linear or branched alkyl, and the molar ratio of cyclohexyl to the total of cyclohexyl and C8-22 linear or branched alkyl is 60 to 95%.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: June 26, 2018
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Toshiaki Endo, Yuji Onuki, Yutaka Imai
  • Patent number: 9909080
    Abstract: The invention provides a grease composition containing a base oil, a thickener and a rust inhibitor, characterized in that the rust inhibitor includes an organic sulfonate and a fatty acid amine salt. The grease composition of the invention exhibits excellent rust preventing characteristics and causes little damage to the environment.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: March 6, 2018
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Kenichiro Matsubara, Terasu Yoshinari, Ryo Aida, Junichi Imai
  • Publication number: 20170362530
    Abstract: The invention provides a grease composition for lubricating resins which contains a base oil, a diurea compound represented by formula (I) as a thickener: R1—NHCONH —R2—NHCONH—R3 (I) (wherein R2 represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 each independently represent a straight-chain or branched alkyl group having 8 to 22 carbon atoms), and a chained hydrocarbon polymer having a weight-average molecular weight of 20,000 to 300,000.
    Type: Application
    Filed: December 28, 2015
    Publication date: December 21, 2017
    Applicants: KYODO YUSHI CO., LTD., NSK Ltd.
    Inventors: Iwaki HIROOKA, Haruhiko KIYOTA, Takeshi YAMAMOTO, Michita HOKAO
  • Publication number: 20170275558
    Abstract: The invention provides a grease composition used for lubricating a mechanical part having a steel portion to be lubricated which performs a rolling motion and a rolling and sliding motion, containing a base oil, a thickener and an additive, wherein the additive includes at least one compound selected from the group consisting of polyethylene wax, oxidized polyethylene wax, polypropylene wax, montan wax and amide wax.
    Type: Application
    Filed: August 31, 2015
    Publication date: September 28, 2017
    Applicant: KYODO YUSHI CO., LTD.
    Inventors: Ryosuke SAITO, Yuta SATO
  • Patent number: 9719045
    Abstract: The invention provides a grease composition for rolling bearings of automotive electrical equipment or automotive auxiliaries, containing a base oil that includes as an essential component an alkyldiphenyl ether oil; a diurea thickener represented by formula (1); an anti-flaking additive including an organic sulfonate rust inhibitor and a load carrying additive; and an antioxidant. In the formula (1), R2 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and one of R1 or R3 represents cyclohexyl group and the other represents cyclohexyl group, an alkyl group having 8 to 22 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: August 1, 2017
    Assignee: KYODO YUSHI CO., LTD.
    Inventors: Ryo Aida, Terasu Yoshinari, Junichi Imai
  • Publication number: 20170183603
    Abstract: The invention provides a lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, which is capable of extending the life of the speed. reducer under high temperatures and keeping low input torque at low temperatures, and includes (a) a base oil containing a synthetic oil, (b) a hydrocarbon wax, and (c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 29, 2017
    Applicants: KYODO YUSHI CO., LTD., Nabtesco Corporation
    Inventors: Junichi IMAI, Ryosuke ICHIMURA, Ryosuke SAITO, Ko TANIMURA, Hongyou WANG, Takahide KUMAGAI, Yasuyuki HATTORI
  • Publication number: 20170175025
    Abstract: The invention provides a solid lubricant in the form of film containing a triazine compound or the salt thereof, such as melamine cyanurate or the like.
    Type: Application
    Filed: December 21, 2016
    Publication date: June 22, 2017
    Applicant: KYODO YUSHI CO., LTD.
    Inventor: Takashi HANZAWA
  • Patent number: 9663698
    Abstract: The invention provides a cold and heat storage agent composition containing paraffin as a base material and at least one selected from the group consisting of organic inhibitors and passivators as a hydrogen generation inhibitor.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: May 30, 2017
    Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATION
    Inventors: Terasu Yoshinari, Minoru Namiki, Koji Sakakibara, Atsushi Yamada, Shozo Ikejima