Patents Assigned to NOK Corporation
  • Publication number: 20230203283
    Abstract: An NBR composition that includes, based on 100 parts by weight of NBR, 0.2 to 0.7 parts by weight, preferably 0.2 to 0.5 parts by weight, of stearic acid, and paraffin wax, which has the melting start temperature of 65° C., in an amount equal to 2 to 6 times the amount of said stearic acid, and preferably further zinc oxide and a UV resistant antioxidant. The NBR composition has improved ozone resistance using stearic acid and paraffin wax, which are generally compounded in NBR compositions, while neither affecting the material physical properties or product appearance, nor increasing the compounding amount of an ozone resistant antioxidant.
    Type: Application
    Filed: May 11, 2021
    Publication date: June 29, 2023
    Applicant: NOK Corporation
    Inventors: Michiyo HIRAYAMA, Hideto KOMURASAKI, Keisuke TAKAHASHI
  • Patent number: 11215284
    Abstract: A sealing apparatus 1 includes a sealing apparatus body 2 and a slinger 3. The sealing apparatus body 2 includes an annular reinforcing ring 10 and an annular elastic body portion 20. The slinger 3 includes a flange portion 31 which is an annular portion extending toward an outer periphery side. The elastic body portion 20 includes an annular end-face lip 21 extending toward an inner side and contacting an outer side surface 31d of the flange portion 31. At least one shallow groove 33 is formed on the outer side surface 31d of the flange portion 31 of the slinger 3.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: January 4, 2022
    Assignee: NOK Corporation
    Inventors: Sosuke Ito, Masahiko Inoue, Hisato Yonai, Yuya Sakano
  • Publication number: 20210285549
    Abstract: A sealing device that can suppress entrance of foreign matter into a place between the end surface of a rotating ring and the end surface of a fixed ring. A sealing device 10 that seals the annular gap between a rotating shaft and a housing having a shaft bore into which the rotating shaft is inserted includes a rotating ring unit 100 provided to the rotating shaft and a fixed ring unit 200 provided to the housing. A plurality of protrusions 140 configured to generate an airflow from the rotating ring 130 side to the fixed ring 230 side when the rotating ring unit 100 rotates are provided on the inner peripheral surface of the rotating ring 130.
    Type: Application
    Filed: October 16, 2017
    Publication date: September 16, 2021
    Applicant: NOK Corporation
    Inventors: Toshiki WATANABE, Haruki IWAI
  • Patent number: 11091622
    Abstract: Provided is a sealing material having abrasion resistance usable for even construction machinery operated under severe conditions while keeping mechanical strength thereof. The sealing material includes a fluorinated resin composition containing the following materials (1) and (2), and further containing the following material (3) or (4). The materials are: (1) fluorinated resin, (2) bronze, (3) tricobalt tetraoxide, (4) a composite metal oxide containing cobalt and aluminum, and further containing at least one of metals selected from the group of chromium, titanium, magnesium, calcium, and lithium. Preferably, the fluorinated resin is polytetrafluoroethylene. Further, the sealing material is usable for construction machinery.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: August 17, 2021
    Assignee: NOK Corporation
    Inventors: Asahi Kitagawa, Yuichi Suzuki
  • Publication number: 20210018038
    Abstract: A ball joint and a dust cover in which a stable sealing function can be provided even when a space for disposing the dust cover is small are provided. The dust cover includes a deformable body portion, a fixed portion which is provided on one end side of the body portion and is fixed to a socket, and a seal portion provided on the other end side of the body portion. The seal portion has a main seal part which is provided to be slidable relative to a spherical portion side flange and an opposite side flange while sandwiched therebetween. The maximum length of the main seal part in a central axis direction in a state in which no external force is applied thereto is longer than a distance between opposing surfaces of the spherical portion side flange and the opposite side flange, where the central axis direction is a direction in which a central axis of the dust cover extends in a state in which no external force is applied thereto.
    Type: Application
    Filed: September 30, 2019
    Publication date: January 21, 2021
    Applicant: NOK Corporation
    Inventor: Keisuke NAKAGAWA
  • Publication number: 20200263630
    Abstract: A cylinder head gasket to be mounted between a cylinder block and a cylinder head of an engine includes: at least one bore-hole plate having a bore hole which corresponds to a cylinder bore of the cylinder block; and a main plate disposed so as to surround the bore-hole plate, wherein the bore-hole plate and the main plate are separated from each other without being in contact with each other, while being connected with each other with a heat insulating member interposed between the bore-hole plate and the main plate.
    Type: Application
    Filed: November 18, 2016
    Publication date: August 20, 2020
    Applicant: NOK Corporation
    Inventors: Tokunori YANAGI, Yuki NAKAGAWA, Takanori ANZAI, Mitsuyasu NAKAJIMA
  • Patent number: 10519311
    Abstract: Provided are a polyurethane elastomer composition excellent in the abrasion resistance and swelling resistance, and a bearing material formed of the polyurethane elastomer composition. The polyurethane elastomer composition contains a polyurethane elastomer of 100 parts by mass, polyethylene wax of 3˜25 parts by mass, and paraffin wax of 1˜10 parts by mass. Further, preferably the polyurethane elastomer composition contains a cobalt based compound of 0.1˜10 parts by mass.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: December 31, 2019
    Assignee: NOK Corporation
    Inventors: Yoichi Hagi, Asahi Kitagawa, Yuichi Suzuki
  • Patent number: 10511034
    Abstract: The invention provides gasket for a fuel battery provided in a fuel battery cell in which an intermediate part including an MEA is interposed between a pair of separators, and structured such that each of a gasket main body retained to one separator of the pair of separators and a gasket main body retained to the other separator comes into contact with the intermediate part at positions where they overlap planarly, wherein bank portions for fixed size stop according to a gasket thickness are integrally formed in both sides or one side in a width direction of both the gasket main bodies. The bank portions for fixed size stop are preferably supported by convex portions which are provided in the separators. Therefore, it is possible to inhibit gasket main bodies from being compressed beyond supposition in the case that contact portions of the gasket main bodies are compressed.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: December 17, 2019
    Assignee: NOK Corporation
    Inventors: Takayuki Horimoto, Hajime Yui
  • Patent number: 10476085
    Abstract: A unit cell that constitutes a fuel cell stack is obtained by sandwiching an electrolyte mem-brane/electrode structure with a cathode-side separator and an anode-side separator. A first resin member is provided along the entire periphery of the cathode-side separator in the outer peripheral portion of the cathode-side separator. Surfaces of the cathode-side separator are provided with sealing parts that cover a part of the first resin member and constitute a first sealing member.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: November 12, 2019
    Assignees: Honda Motor Co., Ltd., NOK Corporation
    Inventors: Satoshi Oyama, Go Morimoto, Satoru Terada, Shuhei Goto, Akihito Giga, Takahiro Hayashi, Takeshi Masaka, Satomi Yogo, Shotaro Koga
  • Patent number: 10466615
    Abstract: A rubber member for coating a developing roll which is obtained by coating a coating layer component around a developing roll having a rubber substrate layer and curing the coating layer component is described. The coating layer component contains: (A) a liquid binder containing at least a polyol, an isocyanate compound and reactive silicone oil; (B) silicone rubber particles having a hardness according to JIS K6253: 1997 by Durometer A, measured instantaneously, of 20 to 80 degrees, and a rubber particle size of 0.2 to 10 pm; and a diluting solvent. A ratio of a thickness of the coating layer after curing and a particle size of the rubber satisfies: the rubber particle size/a coating layer thickness <0.3.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: November 5, 2019
    Assignees: NOK Corporation, Synztec Co. Ltd.
    Inventors: Toshihiro Higashira, Atsushi Ikeda, Nozomu Suzuki, Tomohiro Kondo, Shinobu Kanzaki, Goki Inukai, Lei Wang, Huu Viet Nguyen
  • Patent number: 10465798
    Abstract: The invention provides a gasket which improves a handling workability of a rubber only type gasket. The gasket of the invention is constructed by a combination of a rubber only type gasket main body, and a carrier sheet which is made of a resin film retaining the gasket main body in a non-bonded state, and the carrier sheet is provided with an air inflow port for making air flow into a portion between the carrier sheet and the gasket main body when the gasket main body is detached from the carrier sheet. A gasket retention portion having a three-dimensional shape which is deformed along an outer shape of the gasket main body is arranged at a position which laps over the gasket main body in a plane in the carrier sheet, and the gasket main body is partly accommodated within the gasket retention portion in a thickness direction.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: November 5, 2019
    Assignee: NOK Corporation
    Inventors: Hidetoshi Saso, Yoshihiro Kurano, Takayuki Horimoto, Tetsuya Urakawa, Kenichi Oba, Takuro Nishimura, Hajime Yui
  • Patent number: 10450447
    Abstract: An acrylic rubber composition comprising 5 to 80 parts by weight, preferably 10 to 60 parts by weight, more preferably 20 to 40 parts by weight, of a styrene-based resin, based on 100 parts by weight of acrylic rubber. A vibration insulation member having an excellent tan ? value at a high temperature and improved vibration insulation properties can be molded by adding a specific ratio of a styrene-based resin to acrylic rubber. This acrylic rubber composition can be effectively used as a molding material for a mount, a grommet, or the like in the vicinity of an automobile engine used in a high temperature environment.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: October 22, 2019
    Assignee: NOK Corporation
    Inventor: Tetsuro Negami
  • Patent number: 10450430
    Abstract: An adhesive composition for oil bleeding silicone rubber comprising any of: (A) an alcohol-based organic solvent solution adding 45 to 120 parts by weight of organometallic compound and 2 to 10 parts by weight of water, based on 100 parts by weight of vinyltrialkoxysilane, (B) a solution in which 5 parts by weight or less, preferably 1 to 5 parts by weight, of 3-aminopropyltrialkoxysilane is added to the above alcohol-based organic solvent solution (A), or (C) a solution in which uncrosslinked silicone rubber dissolved beforehand in an organic solvent is added to the above alcohol-based organic solvent solution (A) or (B) in which the amount of the organometallic compound is changed to 5 to 20 parts by weight, at a ratio of 0.1 to 5 wt. %, based on the total solid matters of vinyltrialkoxysilane and the organometallic compound. The adhesive composition has excellent adhesion to various substrates, including metals.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: October 22, 2019
    Assignee: NOK Corporation
    Inventors: Shinichiro Sano, Isao Yoshitake, Katsumi Abe
  • Patent number: 10442919
    Abstract: A hydrogenated nitrile rubber composition and a drivetrain oil seal whereby seal squeal can be prevented even upon wearing away of the sealing or even under dry lubrication conditions without any grease. The hydrogenated nitrile rubber composition comprises 100 parts by weight of hydrogenated nitrile rubber and further 10 to 55 parts by weight of wollastonite and 10 to 55 parts by weight of graphite as fillers, the total amount of the fillers being 50 to 110 parts by weight. The drivetrain oil seal comprises a crosslinked product of the hydrogenated nitrile rubber composition.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: October 15, 2019
    Assignee: NOK Corporation
    Inventor: Atsushi Kobayashi
  • Patent number: 10435547
    Abstract: Provided are a halogenated butyl rubber composition which can be made low in hardness, being excellent in damping property and having excellent balance of the physical properties among kneading, roll-processing and crosslinking, and a vibration-insulating grommet using the halogenated butyl rubber composition. The halogenated butyl rubber composition contains 100 parts mass of halogenated butyl rubber and 3 to 20 parts mass of liquid unsaturated polybutadiene, and preferably further contains 0.1 to 5 parts mass of fatty acid amide. The halogenated butyl rubber composition is suitable for producing a vibration-insulating grommet.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: October 8, 2019
    Assignee: NOK Corporation
    Inventor: Tetsuro Negami
  • Patent number: 10434477
    Abstract: A fiber-reinforced porous hollow fiber membrane comprising a hollow fiber membrane and a reinforcing fiber completely or partially embedded in the hollow fiber membrane; wherein the reinforcing fiber is placed in a portion that does not exceed 90%, preferably 80%, of the thickness of the hollow fiber membrane as viewed from an inner or outer peripheral surface of the hollow fiber membrane on a side that is not a side of the porous hollow fiber membrane to come in contact with an object to be treated, and preferably at least 50 volume % of the cross section of the reinforcing fiber is embedded in the hollow fiber membrane. The obtained fiber-reinforced porous hollow fiber membrane has excellent permeability, separation performance, and mechanical properties.
    Type: Grant
    Filed: April 22, 2014
    Date of Patent: October 8, 2019
    Assignee: NOK Corporation
    Inventors: Takatoshi Sato, Kazuhiko Namigata, Masataka Kondo
  • Patent number: 10428947
    Abstract: A sealing device includes a metal ring, a main lip, an annular elastic body, a sliding ring, and biasing means. The metal ring is hermetically fixed to a housing. The main lip is bonded to the metal ring and is slidably in close contact with an outer periphery surface of a rotating body inserted through an inner circumference of the housing. The annular elastic body is bonded to the metal ring on an outer side of the main lip, and stretchable in an axial direction. The sliding ring is provided at an end portion of the annular elastic body on a side opposite the metal ring, and is slidably in close contact with a seal flange attached to an outer periphery of the rotating body. The biasing means is configured to elastically press the sliding ring against the seal flange, thereby maintaining stable sealability over an extended period of time.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: October 1, 2019
    Assignee: NOK Corporation
    Inventor: Takehiro Nakagawa
  • Patent number: 10393203
    Abstract: An acrylic rubber composition comprising 5 to 80 parts by weight, preferably 10 to 60 parts by weight, more preferably 20 to 40 parts by weight, of a styrene acrylic-based resin containing a functional group other than a carboxyl group, based on 100 parts by weight of acrylic rubber. A vibration insulation member having an excellent tan ? value at a high temperature and improved vibration insulation properties can be molded by adding a specific ratio of a styrene acrylic-based resin to acrylic rubber. This acrylic rubber composition can be effectively used as a molding material for a mount, a grommet, or the like in the vicinity of an automobile engine used in a high temperature environment.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: August 27, 2019
    Assignee: NOK Corporation
    Inventor: Tetsuro Negami
  • Patent number: 10391689
    Abstract: The invention provides a method for manufacturing a substrate-integrated gasket, the method integrating a fiber substrate which is constructed by a pulp fiber having cellulose as a main component and a gasket body which is constructed by a rubber-like elastic body according to a rubber impregnation, wherein a plurality of substrate-integrated gaskets are obtained by executing an injection molding by plural stages of rubber metal molds. Further, the rubber material is filled in plural stages of metal mold cavities by passing the rubber material through the fiber substrate in which a rubber material flow channel in the metal mold is closed at its injection pressure. The invention can reduce a man hour for removing burr and cleaning a metal mold by suppressing generation of rubber burr at the molding time and can reduce an amount of disposal of a molding material, thereby achieving a good manufacturing efficiency.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: August 27, 2019
    Assignee: NOK Corporation
    Inventors: Shotaro Koga, Yuichi Kuroki
  • Patent number: 10371260
    Abstract: A slinger of an oil seal has a thread groove carrying out a pumping action toward a diametrically outer side in an external side end surface of a flange portion. A lip seal member has a main lip, a rubber-like elastic dust lip and a rubber-like elastic intermediate lip. The intermediate lip directs a lip end to a machine inner side, comes into close contact with the slinger over a whole periphery with the lip end, and has annular first projections and circumferentially partial second projections in a facing portion to the slinger. The first projection has a structure which makes dust hard to pass through to the lip end by forming a micro gap in relation to the slinger. The second projection has a structure which properly keeps the micro gap under generation of eccentricity in a rotary shaft by having a higher portion than the first projection.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: August 6, 2019
    Assignee: NOK Corporation
    Inventor: Takehiro Nakagawa