Patents by Inventor Akihiro Shibahara
Akihiro Shibahara 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).
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Patent number: 8935439Abstract: An oil pressure control system of an automatic transmission for a vehicle includes a lock-up clutch, a TC regulator valve, an LC control valve, an LC shift valve, an oil cooler, a control area determination device, a torque transmission capacity calculator, a high load state determination device, and an oil pressure controller. The oil pressure controller is configured to control a TC regulator pressure outputted by a TC regulator valve, so that a torque transmission capacity of a lock-up clutch is greater than a reference torque transmission capacity calculated by the torque transmission capacity calculator, if a control area determined by the control area determination device is a complete engagement area and the high load state determination device determines that an operational state is in a high load state.Type: GrantFiled: January 31, 2013Date of Patent: January 13, 2015Assignee: Honda Motor Co., Ltd.Inventors: Hiroki Murasawa, Satoru Miyata, Akihiro Shibahara
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Patent number: 8791209Abstract: A modified natural rubber particle having carbon-carbon double bands assigned to multifunctional vinyl monomers graft-copolymerized onto the surface of the modified natural rubber particle, which is prepared by graft-copolymerization of multifunctional vinyl monomers having two or more carbon-carbon double bonds onto natural rubber particles or deproteinized natural rubber particles. One of the methods for producing a modified natural rubber particle includes the steps of: forming inclusion complex of the multifunctional vinyl monomers having two or more carbon-carbon double bonds with a guest-protecting agent to protect at least one of the double bonds of the multifunctional vinyl monomers; graft-copolymerizing the resulting inclusion complex onto natural rubber particles or deproteinized natural rubber particles; and deprotecting the protected double bonds by removing the guest-protecting agent from the obtained graft-copolymer.Type: GrantFiled: November 26, 2012Date of Patent: July 29, 2014Assignees: Tokai Rubber Industries, Ltd., National University Corporation Nagaoka University of TechnologyInventors: Osamu Wakisaka, Akihiro Shibahara, Seiichi Kawahara, Yoshimasa Yamamoto, Nanthaporn Pukkate
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Patent number: 8753249Abstract: A control apparatus for an automatic transmission mechanism including a continuously variable transmission having a drive pulley, a driven pulley, and a belt extending around the two pulleys. When beginning of the start of a drive source for driving a vehicle has been detected, a first command oil pressure as a command value of a first control oil pressure supplied to a cylinder chamber of the drive pulley is set to a first predetermined oil pressure substantially equal to 0, and a second command oil pressure as a command value of a second control pressure supplied to a cylinder chamber of the driven pulley is set to a second predetermined oil pressure higher than the first predetermined oil pressure. When the detected second control oil pressure has reached a predetermined threshold value, it is determined that filling of the cylinder chamber of the driven pulley has been completed.Type: GrantFiled: January 21, 2013Date of Patent: June 17, 2014Assignee: Honda Motor Co., Ltd.Inventors: Ryo Matsui, Toshikazu Uneyama, Akihiro Shibahara
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Publication number: 20140050601Abstract: A control apparatus for an automatic transmission mechanism including a continuously variable transmission having a drive pulley, a driven pulley, and a belt extending around the two pulleys. When beginning of the start of a drive source for driving a vehicle has been detected, a first command oil pressure as a command value of a first control oil pressure supplied to a cylinder chamber of the drive pulley is set to a first predetermined oil pressure substantially equal to 0, and a second command oil pressure as a command value of a second control pressure supplied to a cylinder chamber of the driven pulley is set to a second predetermined oil pressure higher than the first predetermined oil pressure. When the detected second control oil pressure has reached a predetermined threshold value, it is determined that filling of the cylinder chamber of the driven pulley has been completed.Type: ApplicationFiled: January 21, 2013Publication date: February 20, 2014Applicant: HONDA MOTOR CO. LTDInventors: Ryo Matsui, Toshikazu Uneyama, Akihiro Shibahara
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Publication number: 20130253785Abstract: An oil pressure control system of an automatic transmission for a vehicle includes a lock-up clutch, a TC regulator valve, an LC control valve, an LC shift valve, an oil cooler, a control area determination device, a torque transmission capacity calculator, a high load state determination device, and an oil pressure controller. The oil pressure controller is configured to control a TC regulator pressure outputted by a TC regulator valve, so that a torque transmission capacity of a lock-up clutch is greater than a reference torque transmission capacity calculated by the torque transmission capacity calculator, if a control area determined by the control area determination device is a complete engagement area and the high load state determination device determines that an operational state is in a high load state.Type: ApplicationFiled: January 31, 2013Publication date: September 26, 2013Applicant: HONDA MOTOR CO., LTD.Inventors: Hiroki MURASAWA, Satoru MIYATA, Akihiro SHIBAHARA
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Patent number: 8357758Abstract: A modified natural rubber particle having carbon-carbon double bonds assigned to multifunctional vinyl monomers graft-copolymerized onto the surface of the modified natural rubber particle, which is prepared by graft-copolymerization of multifunctional vinyl monomers having two or more carbon-carbon double bonds onto natural rubber particles or deproteinized natural rubber particles. One of the methods for producing a modified natural rubber particle includes the steps of: forming inclusion complex of the multifunctional vinyl monomers having two or more carbon-carbon double bonds with a guest-protecting agent to protect at least one of the double bonds of the multifunctional vinyl monomers; graft-copolymerizing the resulting inclusion complex onto natural rubber particles or deproteinized natural rubber particles; and deprotecting the protected double bonds by removing the guest-protecting agent from the obtained graft-copolymer.Type: GrantFiled: July 9, 2009Date of Patent: January 22, 2013Assignees: Tokai Rubber Industries, Ltd., National University Corporation Nagaoka University of TechnologyInventors: Osamu Wakisaka, Akihiro Shibahara, Seiichi Kawahara, Yoshimasa Yamamoto, Nanthaporn Pukkate
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Publication number: 20110130511Abstract: A modified natural rubber particle having carbon-carbon double bonds assigned to multifunctional vinyl monomers graft-copolymerized onto the surface of the modified natural rubber particle, which is prepared by graft-copolymerization of multifunctional vinyl monomers having two or more carbon-carbon double bonds onto natural rubber particles or deproteinized natural rubber particles. One of the methods for producing a modified natural rubber particle includes the steps of: forming inclusion complex of the multifunctional vinyl monomers having two or more carbon-carbon double bonds with a guest-protecting agent to protect at least one of the double bonds of the multifunctional vinyl monomers; graft-copolymerizing the resulting inclusion complex onto natural rubber particles or deproteinized natural rubber particles; and deprotecting the protected double bonds by removing the guest-protecting agent from the obtained graft-copolymer.Type: ApplicationFiled: July 9, 2009Publication date: June 2, 2011Applicants: TOKAI RUBBER INDUSTRIES, LTD., NATIONAL UNIVERSITY CORPORATION NAGAOKA UNIVERSITY OF TECHNOLOGYInventors: Osamu Wakisaka, Akihiro Shibahara, Seiichi Kawahara, Yoshimasa Yamamoto, Nanthaporn Pukkate
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Patent number: 6927244Abstract: A heat-resistant vibration damping rubber composition wherein 20-80 parts by weight of a powder of silica having a BET specific surface area of 20-70 m2/g is mixed with 100 parts by weight of an ethylene-propylene-diene rubber material, and a sulfur-containing silane coupling agent and a mercapto-based silane coupling agent are both mixed with the ethylene-propylene-diene rubber.Type: GrantFiled: April 30, 2003Date of Patent: August 9, 2005Assignee: Tokai Rubber Industries, Ltd.Inventors: Norihito Kimura, Akihiro Shibahara
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Publication number: 20030220438Abstract: A heat-resistant vibration damping rubber composition wherein 20-80 parts by weight of a powder of silica having a BET specific surface area of 20-70 m2/g is mixed with 100 parts by weight of an ethylene-propylene-diene rubber material, and a sulfur-containing silane coupling agent and a mercapto-based silane coupling agent are both mixed with the ethylene-propylene-diene rubber.Type: ApplicationFiled: April 30, 2003Publication date: November 27, 2003Applicant: Tokai Rubber Industries, Ltd.Inventors: Norihito Kimura, Akihiro Shibahara
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Patent number: 5518819Abstract: The present invention is related to a rubber vibration insulator comprising a rubber composition for a rubber insulator wherein at least one selected from unsaturated fatty acid amide and N-substituted fatty acid amide is contained. For this reason, friction coefficient can be greatly reduced in wide temperature range including low temperature range and high temperature range, not in a narrow temperature range near to a normal temperature. Furthermore, the above unsaturated fatty acid amide can be easily melted in a rubber compound so as to be mixed into a normal kneading operation resulting in a superior workability.Type: GrantFiled: April 25, 1995Date of Patent: May 21, 1996Assignee: Tokai Rubber Industries, Ltd.Inventors: Akihiro Shibahara, Hajime Kato
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Patent number: 5246994Abstract: A rubber composition containing (A) a mixture obtained by mixing (a1) 100 parts by weight of a highly saturated, ethylenically unsaturated nitrile-conjugated diene copolymer rubber whose copolymer chain contains not more than 30% by weight of conjugated diene units, and (a2) from 10 to 100 parts by weight of an ethylenically unsaturated monomer containing at least one carboxyl group, at least a proportion of the at least one carboxyl group being metal substituted such that a molar ratio of the at least one carboxyl group to the metal falls within a range of from 1/0.5 to 1/3; (B) an organic peroxide; and (C) a fatty acid amide, from 0.2 to 15 parts by weight of the (B) organic peroxide and from 0.5 to 20 parts by weight of the (C) fatty acid amide being added to 100 parts by weight of the (A) mixture.Type: GrantFiled: October 1, 1992Date of Patent: September 21, 1993Assignees: Tokai Rubber Industries, Ltd., Nippon Zeon Co., Ltd.Inventors: Akihiro Shibahara, Takao Sugiura, Tetsuo Ohyama, Yasunori Iwasaki
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Patent number: 5002829Abstract: A rubber composition containing (a) a rubber material, (b) carbon black, (c) a vulcanizing agent, and (d) an amine compound represented by the following structural formula: ##STR1## the rubber composition containing 0.5 to 4 parts by weight of the amine compound per 100 parts by weight of the rubber material. The rubber composition is vulcanized to produce a rubber formed article such as a rubber vibration isolator.Type: GrantFiled: July 26, 1990Date of Patent: March 26, 1991Assignee: Tokai Rubber Industries, Ltd.Inventor: Akihiro Shibahara
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Patent number: 4950719Abstract: A rubber composition which gives a rubber vibration insulator having excellent low-temperature properties comprises as a main rubber component a blend composed of (a) 10 to 90 parts by weight of a tapered styrene/butadiene copolymer rubber which has an average bound styrene content of 10 to 40% by weight and a 1,2-bond content in the butadiene portion of at least 50% by weight and in which the bound styrene content increases or decreases in one direction along the copolymer molecular chain and (b) 90 to 10 parts by weight of natural rubber and/or synthetic polyisoprene rubber.Type: GrantFiled: December 20, 1988Date of Patent: August 21, 1990Assignees: Nippon Zeon Co., Ltd., Tokai Rubber Industries, Ltd.Inventors: Tetsuo Oyama, Fumitoshi Suzuki, Akio Ueda, Akihiro Shibahara
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Patent number: 4880318Abstract: A slidable vibration-isolating rubber member such as a stabilizer bushing or an eye bushing, interposed between two members such that the rubber member is slidable relative to at least one of the two members. The rubber member is formed from a rubber composition which comprises 100 parts by weight of a rubber material, and 2-20 parts by weight of a silicone oil.Type: GrantFiled: January 15, 1988Date of Patent: November 14, 1989Assignee: Tokai Rubber Industries, Ltd.Inventors: Akihiro Shibahara, Takehiko Taguchi, Akira Uehara, Koji Shinohara, Hiroshi Kawaguchi