Patents by Inventor Motoharu Akiyama

Motoharu Akiyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9595855
    Abstract: An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: March 14, 2017
    Assignee: MINEBEA CO., LTD.
    Inventors: Yusuke Asai, Motoharu Akiyama, Haruka Miyaji
  • Patent number: 9080605
    Abstract: A sliding bearing having a metallic outer ring and a self-lubricating liner formed on the inner circumferential surface of the outer ring. The self-lubricating liner has a self-lubricating resin composition consisting of a mixture of 60 to 80% by weight of polyetherketone-based resin, 10 to 30% by weight of polytetrafluoroethylene, 5 to 15% by weight of carbon fiber, and not more than 15% by weight of aramid fiber, a total amount of the carbon fiber and the aramid fiber being 10 to 25% by weight. The inner circumferential surface of the outer ring has a surface roughness in terms of center line average roughness not less than Ra 4.0 ?m and a surface roughness in terms of maximum height not less than Rmax 30.0 ?m; and the outer ring and the self-lubricating liner are unified. A method of producing the bearing is also provided.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: July 14, 2015
    Assignee: MINEBEA CO., LTD.
    Inventors: Tadahiko Karaki, Kentaro Ishikawa, Motoharu Akiyama, Kunihiro Matsumoto
  • Publication number: 20140239760
    Abstract: An actuator includes a stepping motor; a multi-stage gear device including a first stage gear attached to a rotation shaft of the motor, wherein a gear of each stage engages with a gear of a next stage; and a base member on which the multi-stage gear device and the stepping motor are mounted, wherein in the multi-stage gear device, a grease composition for resin is applied to a bearing part of the gear, and to an engaging part between the gears, and the grease composition for resin includes: (a) a base oil including a poly-alpha-olefin oil with a kinematic viscosity at 100° C. of 4 to 6 mm2/s; (b) a thickening agent which is lithium soap; (c) a viscosity increasing agent; (d) a solid lubricant; and (e) an anti-wear agent, and wherein the NLGI consistency number of the composition is 00, 0, 1, or 2.
    Type: Application
    Filed: February 28, 2014
    Publication date: August 28, 2014
    Inventors: Yusuke ASAI, Motoharu AKIYAMA, Haruka MIYAJI
  • Publication number: 20140169713
    Abstract: A sliding bearing having a metallic outer ring and a self-lubricating liner formed on the inner circumferential surface of the outer ring. The self-lubricating liner has a self-lubricating resin composition consisting of a mixture of 60 to 80% by weight of polyetherketone-based resin, 10 to 30% by weight of polytetrafluoroethylene, 5 to 15% by weight of carbon fiber, and not more than 15% by weight of aramid fiber, a total amount of the carbon fiber and the aramid fiber being 10 to 25% by weight. The inner circumferential surface of the outer ring has a surface roughness in terms of center line average roughness not less than Ra 4.0 ?m and a surface roughness in terms of maximum height not less than Rmax 30.0 ?m; and the outer ring and the self-lubricating liner are unified. A method of producing the bearing is also provided.
    Type: Application
    Filed: February 20, 2014
    Publication date: June 19, 2014
    Applicant: MINEBEA CO., LTD.
    Inventors: Tadahiko KARAKI, Kentaro ISHIKAWA, Motoharu AKIYAMA, Kunihiro MATSUMOTO
  • Patent number: 8722598
    Abstract: The invention provides a grease composition having (A) a lithium soap thickener, (B) as a base oil an ester type synthetic oil obtainable from an esterification reaction of trimethylolpropane with a fatty acid, and (C) (c-1) a 1-naphthylamine type antioxidant and (c-2) a diphenylamine type antioxidant, wherein the contents of (c-1) and (c-2) are 1.0 to 10 mass % in total, based on the total mass of the composition, and the ratio by mass of (c-1) to (c-2) is in the range from 30:70 to 70:30.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: May 13, 2014
    Assignees: Kyodo Yushi Co., Ltd., Minebea Co., Ltd.
    Inventors: Motoharu Akiyama, Yusuke Enomoto, Kenichiro Matsubara
  • Patent number: 8690438
    Abstract: The sliding bearing has a metallic outer ring and a self-lubricating liner formed on the inner circumferential surface of the outer ring. The self-lubricating liner has a self-lubricating resin composition consisting of a mixture of 60 to 80% by weight of polyetherketone-based resin, 10 to 30% by weight of polytetrafluoroethylene, 5 to 15% by weight of carbon fiber and not more than 15% by weight of aramid fiber, total amount of the carbon fiber and the aramid fiber being 10 to 25% by weight. The inner circumferential surface of the outer ring has a surface roughness in terms of center line average roughness not less than Ra 4.0 ?m and a surface roughness in terms of maximum height not less than Rmax 30.0 ?m; and the outer ring and the self-lubricating liner are unified. A method of producing the bearing is also provided.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: April 8, 2014
    Assignee: Minebea Co., Ltd.
    Inventors: Tadahiko Karaki, Kentaro Ishikawa, Motoharu Akiyama, Kunihiro Matsumoto
  • Publication number: 20120275735
    Abstract: A rolling bearing is provided. The rolling bearing includes an inner ring, an outer ring, a plurality of rolling elements disposed in a space between the inner ring and the outer ring, and a grease composition enclosed in the space. The grease composition including (A) a lithium soap thickener, (B) a base oil which is an ester synthetic oil obtained by an esterification reaction of trimethylolpropane with a fatty acid; and (C) (c-1) a 1-naphthylamine antioxidant and (c-2) a diphenylamine antioxidant, a total amount of (c-1) and (c-2) ranging from 1.0 to 10 mass % based on an entire amount of the grease composition, and a blending ratio of (c-1) and (c-2) ranging from 30:70 to 70:30 in terms of mass ratio.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicant: MINEBEA CO., LTD.
    Inventors: Motoharu AKIYAMA, Yusuke ENOMOTO
  • Publication number: 20120277136
    Abstract: The invention provides a grease composition having (A) a lithium soap thickener, (B) as a base oil an ester type synthetic oil obtainable from an esterification reaction of trimethylolpropane with a fatty acid, and (C) (c-1) a 1-naphthylamine type antioxidant and (c-2) a diphenylamine type antioxidant, wherein the contents of (c-1) and (c-2) are 1.0 to 10 mass% in total, based on the total mass of the composition, and the ratio by mass of (c-1) to (c-2) is in the range from 30:70 to 70:30.
    Type: Application
    Filed: April 27, 2012
    Publication date: November 1, 2012
    Applicants: KYODO YUSHI CO., LTD., MINEBEA CO., LTD.
    Inventors: Motoharu AKIYAMA, Yusuke Enomoto, Kenichiro Matsubara
  • Publication number: 20110262059
    Abstract: The sliding bearing has a metallic outer ring and a self-lubricating liner formed on the inner circumferential surface of the outer ring. The self-lubricating liner has a self-lubricating resin composition consisting of a mixture of 60 to 80% by weight of polyetherketone-based resin, 10 to 30% by weight of polytetrafluoroethylene, 5 to 15% by weight of carbon fiber and not more than 15% by weight of aramid fiber, total amount of the carbon fiber and the aramid fiber being 10 to 25% by weight. The inner circumferential surface of the outer ring has a surface roughness in terms of center line average roughness not less than Ra 4.0 ?m and a surface roughness in terms of maximum height not less than Rmax 30.0 ?m; and the outer ring and the self-lubricating liner are unified. A method of producing the bearing is also provided.
    Type: Application
    Filed: April 19, 2011
    Publication date: October 27, 2011
    Applicant: MINEBEA CO., LTD.
    Inventors: Tadahiko KARAKI, Kentaro ISHIKAWA, Motoharu AKIYAMA, Kunihiro MATSUMOTO
  • Patent number: 7696139
    Abstract: A grease composition for a pivot assembly bearing is provided and includes a thickener of 5 to 25% by mass and a base oil of 95 to 75% by mass with respect to the total mass of the thickener and the base oil. Two or more ureas selected from: urea A: a urea comprising diurea compounds having an aliphatic (ALA)/alicyclic (ACA) substituent; urea B: a urea comprising diurea compounds having an alicyclic (ACA)/aromatic (ARA) substituent; and urea C: a urea comprising diurea compounds having an aromatic (ARA)/aliphatic (ALA) substituent are used as the thickener. A poly ?-olefin mixture having a kinematic viscosity at 40° C. of 40 to 70 mm2/s prepared by mixing poly ?-olefin (PAO HV) having a kinematic viscosity at 40° C. of 350 to 450 mm2/s with poly ?-olefin (PAO LV) having a kinematic viscosity at 40° C. of 25 to 40 mm2/s in a mass ratio of 15:85 to 30:70 is used as a base oil. A lead free additive may be used as an additive.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: April 13, 2010
    Assignees: Minebea Co., Ltd., Nippon Grease Co., Ltd.
    Inventors: Seiji Okamura, Motoharu Akiyama, Hiroki Iwamatsu, Yasuhiro Miyamoto
  • Publication number: 20090029881
    Abstract: A heat-resistant noise-reduction grease and a bearing containing the grease for a small motor such as a motor for imaging equipment such as a blower fan and motor bearing for a household electrical appliance such as an air conditioner, which is eco-friendly and excellent in noise-reduction properties is provided.
    Type: Application
    Filed: August 1, 2005
    Publication date: January 29, 2009
    Inventors: Seiji Okamura, Motoharu Akiyama, Seiji Hashimoto, Hiroki Iwamatsu
  • Publication number: 20080305973
    Abstract: A lithium grease composition which can be sealed in a small motor bearing to reduce noise, composed of 5-20% by weight of a thickener and 95-80% by weight of a base oil, wherein said grease composition adopts lithium soap as the thickener, which is synthesized from lithium hydroxide and a higher fatty acid with 10 to 20 carbon atoms and/or a higher hydroxyfatty acid with one or more hydroxyl groups and 10 or more carbon atoms, and the base oil includes, as a main component, a polymer ester oil (A) in which 8 or more ester groups are arranged in a comb tooth form on one side of chain molecules constituted by eight or more carbon atoms which is expressed by general formula 1: (In the formula, each of R1, R2, R3 and R4 is an alkyl group, where x is an integer and x?2, and y is an integer and y?2.) and the base oil (40 C) has a viscosity of 25 to 80 mm2/s.
    Type: Application
    Filed: July 29, 2005
    Publication date: December 11, 2008
    Inventors: Hiroki Iwamatsu, Motoharu Akiyama, Yasuhiro Miyamoto, Seiji Okamura
  • Publication number: 20070072777
    Abstract: A grease composition for a pivot assembly bearing is provided and includes a thickener of 5 to 25% by mass and a base oil of 95 to 75% by mass with respect to the total mass of the thickener and the base oil. Two or more ureas selected from: urea A: a urea comprising diurea compounds having an aliphatic (ALA)/alicyclic (ACA) substituent; urea B: a urea comprising diurea compounds having an alicyclic (ACA)/aromatic (ARA) substituent; and urea C: a urea comprising diurea compounds having an aromatic (ARA)/aliphatic (ALA) substituent are used as the thickener. A poly ?-olefin mixture having a kinematic viscosity at 40° C. of 40 to 70 mm 2/s prepared by mixing poly ?-olefin (PAO HV) having a kinematic viscosity at 40° C. of 350 to 450 mm2/s with poly ?-olefin (PAO LV) having a kinematic viscosity at 40° C. of 25 to 40 mm2/s in a mass ratio of 15:85 to 30:70 is used as a base oil. A lead free additive may be used as an additive.
    Type: Application
    Filed: September 25, 2006
    Publication date: March 29, 2007
    Inventors: Seiji Okamura, Motoharu Akiyama, Hiroki Iwamatsu, Yasuhiro Miyamoto
  • Patent number: 7176167
    Abstract: According to the invention, a self contained vibration resistant bearing is provided. The bearing is coated with a film formed from a rust preventive oil having an extreme-pressure additive content of 0.5 to 10% by weight. Desirably the extreme-pressure additive is an organometallic compound, an organofatty acid compound, organofatty acid derivative, an organophosphoric acid compound or a combination of two(2) or more of such compounds. When a rust preventive film that contains an extreme-pressure additive is formed all over bearing components during the assembling process, the bearing components are fully protected even from sudden vibrations from transportation.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: February 13, 2007
    Inventors: Motoharu Akiyama, Noriyuki Yoshimura
  • Patent number: 7140778
    Abstract: A resin composite for use in the manufacture of slide bearings is formed of a resin and fine particles of RBC or CRBC dispersed in the resin. The resin composite can be molded into slide bearings.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: November 28, 2006
    Assignee: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Motoharu Akiyama, Morinobu Kawamura
  • Patent number: 7132155
    Abstract: A foam-molded synthetic resin material in which a RBC or CRBC fine powder and bubbles are homogeneously dispersed. There is provided an electrically conductive molded resin material of sufficient porosity by using a fine powder of RB ceramics (RBC) or CRB ceramics (CRBC), in which a surface thereof is not covered with a skin layer while an electrically conductive material is directly bared on the surface, and a method for preparing same and uses thereof.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: November 7, 2006
    Assignee: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Motoharu Akiyama, Morinobu Kawamura
  • Patent number: 7067463
    Abstract: A pivot assembly bearing used in an information storage device maintains its capabilities for a longer period of time under frequent quick starting and stopping by containing a grease composition made up of a base oil, a thickener and an extreme-pressure agent.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: June 27, 2006
    Assignee: Minebea Co., Ltd.
    Inventor: Motoharu Akiyama
  • Patent number: 7008196
    Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.
    Type: Grant
    Filed: March 11, 2004
    Date of Patent: March 7, 2006
    Assignee: Minebea Co. Ltd.
    Inventors: Kazuo Hokkirigawa, Motoharu Akiyama, Morinobu Kawamura
  • Patent number: 6946429
    Abstract: A bearing for an electronically controlled throttle motor in an automobile filled with a grease composition with a kinetic viscosity between 40 and 150 mm2/sec (at 40° C.) containing (a) a straight-chain perfluoropolyether oil with a kinetic viscosity less than 25 mm2/sec (at 40° C.) expressed by the formula RfO(CF2O)p(C2F4O)q(C3F6O)rRf (where Rf is a perfluoro lower alkyl group, and p, q and r are integers whose total is between 25 and 45), (b) a base oil containing a straight-chain perfluoropolyether oil with a kinetic viscosity greater than 250 mm2/sec (at 40° C.) expressed by the formula RfO(CF2O)p(C2F4O)q(C3F6O)rRf (where Rf is a perfluoro lower alkyl group, and p, q and r are integers whose total is between 80 and 200) and (c) a polytetrafluoroethylene filler.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: September 20, 2005
    Assignee: Minebea Co., Ltd.
    Inventor: Motoharu Akiyama
  • Publication number: 20050124750
    Abstract: According to the invention, a synthetic resin composition for the manufacture of parts which require a low coefficient of friction for example bearing parts or other sliding parts having a number of desirable properties is provided. The resin composition is made of a fine powder of RBC, CRBC and mixtures of RBC and CRBC dispersed in a synthetic resin. The RBC and/or CRBC fine powder have an average particle diameter of less than 10 ?m, optionally 1 to less than 10 ?m, preferably 1 ?m to 5 ?m. Desirably the weight percent of the RBC and/or CRBC is from 10% to 70% preferably from 30% to 70% of the entire composition and is uniformly dispersed in the resin. In another aspect of the invention, parts desirably having particularly a low coefficient of friction are fabricated according to the invention from the resin composition.
    Type: Application
    Filed: September 16, 2004
    Publication date: June 9, 2005
    Applicant: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Motoharu Akiyama, Morinobu Kawamura