Patents Assigned to Kyodo Yushi Co., Ltd.
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Patent number: 10280382Abstract: 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: GrantFiled: April 28, 2016Date of Patent: May 7, 2019Assignees: KYODO YUSHI CO., LTD., NIDEC CORPORATIONInventors: Iwaki Hirooka, Takayuki Oe, Sayuri Tsubata, Yuji Hagiwara
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Publication number: 20190062664Abstract: 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: ApplicationFiled: July 5, 2018Publication date: February 28, 2019Applicants: Kyodo Yushi Co., Ltd., Denso CorporationInventors: Shozo Ikejima, Iwaki Hirooka, Yutaka Imai, Ryosuke Ichimura, Kazuki Isa, Yusuke Asada, Kyoji Inukai, Hiromasa Tanaka, Masashi Tobayama, Toshizo Watanabe
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Publication number: 20190055491Abstract: 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: ApplicationFiled: March 8, 2017Publication date: February 21, 2019Applicant: KYODO YUSHI CO., LTD.Inventors: Terasu Yoshinari, Tomonobu Komoriya, Yuki Takeyama
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Publication number: 20180340128Abstract: There is provided a press-fit lubricant composition comprising an unsaturated compound with an iodine value of 100 or more.Type: ApplicationFiled: April 27, 2018Publication date: November 29, 2018Applicants: KYODO YUSHI CO., LTD., DENSO CORPORATIONInventors: Takahiro NIHIRA, Hiroyuki ISHIKAWA, Masanori KOMABA, Shozo IKEJIMA, Yusuke ASADA, Takahiro NOZU, Takumi SHIOMI, Kyoji INUKAI
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Patent number: 10081778Abstract: 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: GrantFiled: October 30, 2013Date of Patent: September 25, 2018Assignees: KYODO YUSHI CO., LTD., HONDA MOTOR CO., LTD.Inventors: Daisuke Tsutsui, Yuta Sato, Junichi Imai, Morinobu Kawamura
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Patent number: 10077411Abstract: 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: GrantFiled: August 4, 2014Date of Patent: September 18, 2018Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATIONInventors: Terasu Yoshinari, Tomonobu Komoriya, Iwaki Hirooka, Masataka Muto, Satoru Nakazawa, Yoshinori Fukushima, Shigeyuki Mori
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Publication number: 20180216025Abstract: 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: ApplicationFiled: October 22, 2015Publication date: August 2, 2018Applicant: KYODO YUSHI CO., LTD.Inventors: MASAMICHI YAMAMOTO, NORIKO TANAKA, KENICHIRO MATSUBARA
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Patent number: 10005980Abstract: 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: GrantFiled: April 22, 2015Date of Patent: June 26, 2018Assignee: KYODO YUSHI CO., LTD.Inventors: Toshiaki Endo, Yuji Onuki, Yutaka Imai
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Patent number: 9909080Abstract: 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: GrantFiled: June 28, 2010Date of Patent: March 6, 2018Assignee: KYODO YUSHI CO., LTD.Inventors: Kenichiro Matsubara, Terasu Yoshinari, Ryo Aida, Junichi Imai
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Publication number: 20170362530Abstract: 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: ApplicationFiled: December 28, 2015Publication date: December 21, 2017Applicants: KYODO YUSHI CO., LTD., NSK Ltd.Inventors: Iwaki HIROOKA, Haruhiko KIYOTA, Takeshi YAMAMOTO, Michita HOKAO
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Publication number: 20170275558Abstract: 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: ApplicationFiled: August 31, 2015Publication date: September 28, 2017Applicant: KYODO YUSHI CO., LTD.Inventors: Ryosuke SAITO, Yuta SATO
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Patent number: 9719045Abstract: 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: GrantFiled: October 25, 2013Date of Patent: August 1, 2017Assignee: KYODO YUSHI CO., LTD.Inventors: Ryo Aida, Terasu Yoshinari, Junichi Imai
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Publication number: 20170183603Abstract: 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: ApplicationFiled: December 8, 2016Publication date: June 29, 2017Applicants: KYODO YUSHI CO., LTD., Nabtesco CorporationInventors: Junichi IMAI, Ryosuke ICHIMURA, Ryosuke SAITO, Ko TANIMURA, Hongyou WANG, Takahide KUMAGAI, Yasuyuki HATTORI
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Publication number: 20170175025Abstract: 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: ApplicationFiled: December 21, 2016Publication date: June 22, 2017Applicant: KYODO YUSHI CO., LTD.Inventor: Takashi HANZAWA
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Patent number: 9663698Abstract: 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: GrantFiled: February 15, 2013Date of Patent: May 30, 2017Assignees: KYODO YUSHI CO., LTD., DENSO CORPORATIONInventors: Terasu Yoshinari, Minoru Namiki, Koji Sakakibara, Atsushi Yamada, Shozo Ikejima
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Publication number: 20170074326Abstract: Provided is a grease composition for a wheel bearing, containing (a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein the ratio of the synthetic hydrocarbon oil to the total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass %, and the base oil has a kinematic viscosity at 40° C. of 40 to 65 mm2/s; (b) a thickener of formula (A) wherein R2 is diphenylmethane, and R1 and R3, which may be the same or different from each other, each represent cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group being 50 to 90 mol %; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent.Type: ApplicationFiled: March 12, 2015Publication date: March 16, 2017Applicants: Kyodo Yushi Co., Ltd., NTN CorporationInventors: Yuta Sato, Daisuke Tsutsui, Junichi Imai, Shinsuke Hirano
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Patent number: 9574159Abstract: The invention provides a grease composition for use in an image forming apparatus, containing a thickener, a base oil and a lubricity improver, wherein the thickener is a lithium soap, the base oil is a synthetic hydrocarbon oil, the lubricity improver is a polyethylene oxide wax, and the image forming apparatus is equipped with a sliding member and a member for holding the sliding member which is driven to slide through the holding member via the grease composition, one of the sliding member or the holding member for the sliding member having a sliding surface formed from a metal, and the other having a sliding surface formed from a resin.Type: GrantFiled: August 28, 2014Date of Patent: February 21, 2017Assignees: KYODO YUSHI CO., LTD., SEIKO EPSON CORPORATION, HOSOKAWA CORPORATIONInventors: Kenichiro Matsubara, Masamichi Yamamoto, Satoshi Nakata, Koji Hosokawa
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Patent number: 9567548Abstract: A grease composition for constant velocity joints which comprises the following components: (a) a base oil, (b) a thickener, (c) a montan wax, (d) a zinc sulfonate, and (e) a sulfurized molybdenum dialkyldithiocarbamate.Type: GrantFiled: October 4, 2013Date of Patent: February 14, 2017Assignee: KYODO YUSHI CO., LTD.Inventor: Satoshi Yamazaki
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Patent number: 9567545Abstract: A grease composition for EV/HEV driving motor bearing, containing a diurea thickener of the following formula (A): wherein R1, R2 and R3 are defined, with the ratio of the number of moles of the straight-chain or branched alkyl group having 16 to 20 carbon atoms to the total number of moles of the cyclohexyl group and the straight-chain or branched alkyl group having 16 to 20 carbon atoms, expressed as [((the number of alkyl group)/(the number of cyclohexyl group+the number of alkyl group))×100] being 60 to 80%, and a base oil which has a kinematic viscosity at 40° C. of 15 to 50 mm2/s and includes a trimethylolpropane ester oil in an amount of 80 mass % or more based on the total base oil mass. The grease composition can exhibit a long bearing lubrication life at high temperature and high speed, and satisfactory low-temperature flowability.Type: GrantFiled: July 27, 2012Date of Patent: February 14, 2017Assignees: NSK LTD., KYODO YUSHI CO., LTD.Inventors: Hironori Mizuki, Takeshi Maejima, Kenichi Iso, Kazunori Nakagawa, Yutaka Imai, Ryo Aida
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Publication number: 20170002285Abstract: The invention provides a silicone grease composition where the high friction properties are improved, with no decrease of the wear preventive characteristics. The silicone grease composition contains a thickener, a base oil containing a silicone oil in an amount of 50 mass % or more of the total mass of the base oil, and a metallic oxide with a Mohs hardness of 6 or less as a friction modifier.Type: ApplicationFiled: February 18, 2015Publication date: January 5, 2017Applicant: KYODO YUSHI CO., LTD.Inventors: Iwaki HIROOKA, Terasu YOSHINARI