Patents by Inventor Yoshimasa Aoki
Yoshimasa Aoki 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: 8755972Abstract: In a rear wheel toe angle control system, the toe angle response properties of the right and left wheels are prevented from differing from each other depending on the operating condition of the vehicle, and the handling of the vehicle can be improved.Type: GrantFiled: December 15, 2010Date of Patent: June 17, 2014Assignee: Honda Motor Co., Ltd.Inventors: Yoshimasa Aoki, Kuniyoshi Tanaka
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Publication number: 20120253608Abstract: In a rear wheel toe angle control system, the toe angle response properties of the right and left wheels are prevented from differing from each other depending on the operating condition of the vehicle, and the handling of the vehicle can be improved.Type: ApplicationFiled: December 15, 2010Publication date: October 4, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Yoshimasa Aoki, Kuniyoshi Tanaka
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Patent number: 6340377Abstract: The invention relates to an iron-based high-temperature wear-resistant sintered alloy. This alloy contains 3.74-13.36 wt % W, 0.39-5.58 wt % V, 0.2-5.78 wt % Cr, 0.1-0.6 wt % Si, 0.39-1.99 wt % Mn, 0.21-1.18 wt % S, and up to 2.16 wt % C. This alloy includes 20-80 wt % of a first phase and 80-20 wt % of a second phase, each distributed therein, in the form of spots. The first phase contains 3-7 wt % W, up to 1 wt % Cr, 0.1-0.6 wt % Si, 0.2-1 wt % Mn, 0.1-0.6 wt % S, and up to 2.2 wt % C. The first phase may contain 0.5-1.5 wt % V, and in this case the vanadium content of the alloy becomes 0.79-5.88 wt %. The second phase contains 7-15 wt % W, 2-7 wt % V, 1-7 wt % Cr, 0.1-0.6 wt % Si, 0.2-1 wt % Mn, 0.1-0.6 wt % S, and up to 2.2 wt % of C. Each phase contains 0.3-1.6 wt % MnS and a carbide of at least tungsten, which are dispersed therein. The second phase further contains 10-20 areal % tungsten carbide (particle diameter: ≧1 &mgr;m) dispersed therein. The alloy further contains 0.Type: GrantFiled: April 11, 2000Date of Patent: January 22, 2002Assignees: Hitachi Powdered Metals Co., Ltd., Nissan Motor Co., Ltd.Inventors: Hideaki Kawata, Kei Ishii, Koichiro Hayashi, Yoshimasa Aoki, Atsushi Ehira, Kunio Maki, Masaki Toriumi
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Patent number: 6302937Abstract: The present invention provides a sintered material having high mechanical strength and superior wear resistance, and to a process of manufacture therefor. A sintered alloy having superior wear resistance has an overall composition consisting of, in percent by weight, Ni in an amount of 6.0 to 25.0%, Cr in an amount of 0.6 to 8.75%, C in an amount of 0.54 to 2.24%, and balance consisting of Fe, the sintered alloy exhibiting a metallographic structure in which the following hard phase is dispersed in a mixed structure of martensite and austenite, the hard phase comprising a core consisting of Cr carbide and a ferrite phase diffused Cr, or a mixed phase of ferrite and austenite diffused Cr, surrounding the core, and an area ratio of austenite in the mixed structure in the metallographic structure ranging from 5 to 30%.Type: GrantFiled: November 29, 1999Date of Patent: October 16, 2001Assignee: Hitachi Powdered Metals, Co., Ltd.Inventors: Koichiro Hayashi, Yoshimasa Aoki, Koichi Aonuma
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Patent number: 6251157Abstract: A sintered alloy having superb wear resistance comprising: composite phases dispersed in a matrix of the sintered alloy; the composite phase consisting of; a particle group in which Cr carbide particles and Cr sulfide particles exist in a mixed condition; and a ferrite phase or a mixture phase of ferrite and austenite surrounding the particle group as a core.Type: GrantFiled: August 18, 1999Date of Patent: June 26, 2001Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Yoshimasa Aoki, Koichiro Hayashi, Koichi Aonuma, Toru Tsuboi
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Patent number: 5949003Abstract: The invention relates to a sintered alloy. This sintered alloy includes 3-13.4 wt % of W, 0.4-5.6 wt % or 0.8-5.9 wt % of V, 0.2-5.6 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, 0.6-2.2 wt % of C, and a balance of Fe. The sintered alloy includes first and second phase which are distributed therein, in a form of spots, respectively. The second phase is in an amount of from 20 to 80 wt %, based on the total weight of the first and second phases. The first phase contains 3-7 wt % of W, 0.5-1.5 wt % of optional V, up to 1 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, up to 2.2 wt % of C, and a balance of Fe. The second phase contains 3-15 wt % of W, 2-7 wt % of V, 1-7 wt % of Cr, 0.1-0.6 wt % or 0.6-5.0 wt % of Si, 0.1-0.6 wt % or 0.2-1.0 wt % of Mn, up to 2.2 wt % of C, and a balance of Fe. When the manganese contents of the first and second phases and the total of the sintered alloy are respectively in a range of from 0.2 to 1.Type: GrantFiled: April 14, 1997Date of Patent: September 7, 1999Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Yoshimasa Aoki, Kei Ishii, Koichiro Hayashi, Kouichi Aonuma, Hideaki Kawata, Kunio Maki, Atsushi Ehira, Akira Fujiki, Sadayuki Abo, Seigo Sato
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Patent number: 5834664Abstract: The present invention provides a valve seat having a suitable degree of wear resistance, which can be produced without recourse to expensive elements represented by cobalt and at a cost lower than ever before. This valve seat is formed of a wear-resistant sintered alloy having a general composition consisting essentially of, in weight ratio, 0.736 to 5.79% of nickel, 0.12 to 6.25% of chromium, 0.294 to 0.965% of molybdenum, and 0.508 to 2.0% of carbon with the balance being iron, and inevitable impurities, and having a micro structure wherein a bainite matrix structure or a mixed bainite and sorbite matrix structure includes a nucleus having a hard phase composed mainly of chromium carbide, and a ferrite surrounding said nucleus and having a high chromium concentration and a martensite surrounding said ferrite are dispersed.Type: GrantFiled: January 7, 1997Date of Patent: November 10, 1998Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Koichi Aonuma, Yoshimasa Aoki, Koichiro Hayashi
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Patent number: 5824922Abstract: The invention provides a valve seat having a suitable degree of wear resistance, which can be produced without recourse to expensive elements represented by cobalt and at a cost lower than ever before. This valve seat is formed of a wear-resistant sintered alloy having a general composition consisting essentially of, in weight ratio, 0.736 to 9.65% of nickel, 0.736 to 2.895% of copper, 0.294 to 0.965% of molybdenum, 0.12 to 6.25% of chromium, and 0.508 to 2.0% of carbon with the balance being iron, and inevitable impurities, and having a metallic structure in which there are dispersed (1) a martensite, (2) a bainite having a nucleus of sorbite and/or upper bainite and surrounding said nucleus, (3) an austenite having a high nickel concentration, and (4) a hard phase surrounding with a ferrite having a high chromium concentration and composed mainly of a chromium carbide.Type: GrantFiled: January 7, 1997Date of Patent: October 20, 1998Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Koichi Aonuma, Yoshimasa Aoki, Koichiro Hayashi
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Patent number: 5753005Abstract: A source powder for a wear-resistant sintered material, consisting essentially of, in weight percentages, Cr: 3.0 to 6.0%, 2 Mo+W: 10.0 to 20.0%, V: 1.0 to 8.0%, Co: 10.0% or below, C: 0.20% to {0.01(2 Mo+W)+0.24 V}%, Si: 0.1 to 1.0%, Mn: 0.1 to 1.0% and the balance being Fe and unavoidable impurities, or one prepared by adding 0.10 to 0.8% of S to the above composition. This powder can be compacted into a green compact having a high green density, which can further give a wear-resistant sintered material having a high sintered density, hardness and strength.Type: GrantFiled: January 10, 1997Date of Patent: May 19, 1998Assignees: Hitachi Powdered Metals Co., Ltd., Mitsubishi Steel Mfg. Co., Ltd.Inventors: Yoshimasa Aoki, Kei Ishii, Yukio Tokuyama, Yuji Soda
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Patent number: 5529602Abstract: Disclosed is a sintered iron alloy and a method of manufacturing the same. The sintered alloy comprises: an alloy matrix and a lead phase for imparting lubricability to the sintered alloy. The alloy matrix comprises a first alloy phase being composed of 0.5 to 3% nickel by weight, 0.5 to 3% molybdenum by weight, 5.5 to 7.5% cobalt by weight, 0.6 to 1.2% carbon by weight, and the balance iron, and a second alloy phase being composed of 26 to 30% molybdenum by weight, 7 to 9% chromium by weight, 1.5 to 2.5% silicon by weight, and the balance cobalt. The content of the lead phase in the sintered alloy is not more than 3.5% by weight. The lead phase is dispersed in the alloy matrix and a pore which is formed in the alloy matrix. The ratio of the lead dispersed in the alloy matrix to the total lead phase is 60% by weight or more, and the lead phase dispersed in the alloy matrix is particles in which the maximum particle size is 10 .mu.m or less.Type: GrantFiled: February 22, 1995Date of Patent: June 25, 1996Assignees: Hitachi Powdered Metals Co., Ltd., Nissan Motor Co., Ltd.Inventors: Kei Ishii, Yoshimasa Aoki, Hideaki Kawata, Akira Fujiki, Katsuyuki Nakamura, Kazuhiko Takahashi
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Patent number: 5207821Abstract: Disclosed is a sintered alloy composition and method of manufacturing the same, the sintered alloy composition having a multi-phase structure, comprising: a first phase composed of aluminum and copper; and a second phase being dispersed in the first phase and composed of molybdenum, chromium, silicon and cobalt. This alloy composition has excellent abrasion and corrosion resistance, preferably to be used for making machine parts such as valve seats for engines.Type: GrantFiled: July 9, 1991Date of Patent: May 4, 1993Assignees: Hitachi Powdered Metals Co., Ltd., Honda Giken Kogyo Kabushiki KaishaInventors: Yutaka Ikenoue, Keitaro Suzuki, Yoshimasa Aoki, Hideo Urata, Koji Koishikawa, Makoto Tsuji