Patents by Inventor Keita Taguchi
Keita Taguchi 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: 9441723Abstract: A steel gear 1 includes a generally cylindrical outer peripheral ring portion 2, on an outer peripheral surface 20a of which a toothed shape 10 is formed, and a flange portion 3 provided to extend radially inward from an inner peripheral surface 20b of the outer peripheral ring portion 2. The outer peripheral ring portion 2 includes a first projecting portion 21 that projects toward one side in the axial direction with respect to a coupling position at which the first projecting portion 21 is coupled to the flange portion 3, and a second projecting portion 22 that projects toward the other side in the axial direction with respect to a coupling position at which the second projecting portion 22 is coupled to the flange portion 3. The axial length of the first projecting portion 21 is longer than the axial length of the second projecting portion 22.Type: GrantFiled: March 1, 2012Date of Patent: September 13, 2016Assignee: AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Yasutaka Miyake, Takaaki Ogiso
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Patent number: 9388476Abstract: A steel gear includes a substantially cylindrical outer peripheral ring portion having a toothed shape formed on its outer peripheral surface; and a flange portion extended radially inward from an inner peripheral surface of the outer peripheral ring portion. The steel gear has a thermal history layer formed in the outer peripheral ring portion, and the depth of the thermal history layer in the direction inward from the tooth bottom of the toothed shape of the outer peripheral surface is greater in the first protruding portion and the second protruding portion than in the coupling portion with the flange portion, and is substantially the same between the first protruding portion and the second protruding portion. As a result, even if the “carburization/slow cooling/high-frequency quenching treatment” is used as a manufacturing method of the steel gear, the steel gear has high dimensional accuracy.Type: GrantFiled: March 1, 2012Date of Patent: July 12, 2016Assignee: AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Yasutaka Miyake, Takaaki Ogiso
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Patent number: 9328811Abstract: A drive plate includes a disk-shaped plate portion; and a tooth-shaped portion formed at an outer peripheral end of the plate portion. The plate portion and the tooth-shaped portion are integrally shaped from a single steel plate material. The plate portion and the tooth-shaped portion include a carburized layer provided over an entire surface layer of the plate portion and the tooth-shaped portion, the carburized layer having a carbon concentration higher than that of a center portion of the plate portion and the tooth-shaped portion in a thickness direction. The carburized layer of the plate portion is higher in hardness than the center portion of the plate portion in the thickness direction. The carburized layer of the tooth-shaped portion has been subjected to a quenching process, and is further higher in hardness than the carburized layer of the plate portion.Type: GrantFiled: April 16, 2012Date of Patent: May 3, 2016Assignee: AISIN AW CO., LTD.Inventors: Daisuke Iwata, Tomoyuki Hori, Naoki Yokoyama, Koji Obayashi, Keita Taguchi, Hiroshi Shibata
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Patent number: 9034116Abstract: A manufacturing method for a composite steel part including manufacturing a first steel part by preparing an intermediate product in which an extra portion is added, and heating the intermediate product to an austenitizing temperature in a carburizing atmosphere to form a carburized layer, cooling the intermediate product at a rate less than a cooling rate at which martensitic transformation is caused and in which the intermediate product is cooled to a temperature equal to or less than a temperature at which structure transformation due to the cooling is completed, heating the intermediate product to an austenitizing range by high-density energy and thereafter cooled at a rate equal to or more than the cooling rate at which martensitic transformation is caused to form a carburized quenched portion, cutting the extra portion of the intermediate product, and welding the first steel part and the second steel part to each other.Type: GrantFiled: April 6, 2012Date of Patent: May 19, 2015Assignee: AISIN AW CO., LTD.Inventors: Koji Obayashi, Daisuke Kasai, Keita Taguchi, Takaaki Ogiso, Tsutomu Sato
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Publication number: 20150020924Abstract: A manufacturing method for a composite steel part including manufacturing a first steel part by preparing an intermediate product in which an extra portion is added, and heating the intermediate product to an austenitizing temperature in a carburizing atmosphere to form a carburized layer, cooling the intermediate product at a rate less than a cooling rate at which martensitic transformation is caused and in which the intermediate product is cooled to a temperature equal to or less than a temperature at which structure transformation due to the cooling is completed, heating the intermediate product to an austenitizing range by high-density energy and thereafter cooled at a rate equal to or more than the cooling rate at which martensitic transformation is caused to form a carburized quenched portion, cutting the extra portion of the intermediate product, and welding the first steel part and the second steel part to each other.Type: ApplicationFiled: October 10, 2014Publication date: January 22, 2015Inventors: Koji OBAYASHI, Daisuke KASAI, Keita TAGUCHI, Takaaki OGISO, Tsutomu SATO
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Patent number: 8733199Abstract: A method of manufacturing a gear, and the resulting gear, the method resulting such that the surface layer portions of the tooth portions and a tooth root portion are made to be a carburized layer, the remaining portion of the tooth portions and a portion of a disk portion lying below the carburized layer be a quench-hardened layer, and a region of the disk portion lying deeper than the quench-hardened layer be an unquenched layer. The gear is manufactured using raw material steel having the following chemical composition: C: 0.1% to 0.40% (% by mass), Si: 0.35% to 3.0%, Mn: 0.1% to 3.0%, Cr: less than 0.2%, Mo: 0.1% or less, P: 0.03% or less, S: 0.15% or less, Al: 0.05% or less, N: 0.03% or less, and Fe and unavoidable impurities.Type: GrantFiled: April 8, 2011Date of Patent: May 27, 2014Assignees: Aisin AW Co., Ltd., Nippon Steel CorporationInventors: Koji Obayashi, Keita Taguchi, Susumu Kato, Shuji Kozawa, Manabu Kubota, Yuji Adachi, Hirokazu Sato
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Publication number: 20130319154Abstract: A steel gear 1 includes a generally cylindrical outer peripheral ring portion 2, on an outer peripheral surface 20a of which a toothed shape 10 is formed, and a flange portion 3 provided to extend radially inward from an inner peripheral surface 20b of the outer peripheral ring portion 2. The outer peripheral ring portion 2 includes a first projecting portion 21 that projects toward one side in the axial direction with respect to a coupling position at which the first projecting portion 21 is coupled to the flange portion 3, and a second projecting portion 22 that projects toward the other side in the axial direction with respect to a coupling position at which the second projecting portion 22 is coupled to the flange portion 3. The axial length of the first projecting portion 21 is longer than the axial length of the second projecting portion 22.Type: ApplicationFiled: March 1, 2012Publication date: December 5, 2013Applicant: AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Yasutaka Miyake, Takaaki Ogiso
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Publication number: 20130312560Abstract: A steel gear includes a substantially cylindrical outer peripheral ring portion having a toothed shape formed on its outer peripheral surface; and a flange portion extended radially inward from an inner peripheral surface of the outer peripheral ring portion. The steel gear has a thermal history layer formed in the outer peripheral ring portion, and the depth of the thermal history layer in the direction inward from the tooth bottom of the toothed shape of the outer peripheral surface is greater in the first protruding portion and the second protruding portion than in the coupling portion with the flange portion, and is substantially the same between the first protruding portion and the second protruding portion. As a result, even if the “carburization/slow cooling/high-frequency quenching treatment” is used as a manufacturing method of the steel gear, the steel gear has high dimensional accuracy.Type: ApplicationFiled: March 1, 2012Publication date: November 28, 2013Applicant: AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Yasutaka Miyake, Takaaki Ogiso
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Publication number: 20120297910Abstract: A drive plate includes a disk-shaped plate portion; and a tooth-shaped portion formed at an outer peripheral end of the plate portion. The plate portion and the tooth-shaped portion are integrally shaped from a single steel plate material. The plate portion and the tooth-shaped portion include a carburized layer provided over an entire surface layer of the plate portion and the tooth-shaped portion, the carburized layer having a carbon concentration higher than that of a center portion of the plate portion and the tooth-shaped portion in a thickness direction. The carburized layer of the plate portion is higher in hardness than the center portion of the plate portion in the thickness direction. The carburized layer of the tooth-shaped portion has been subjected to a quenching process, and is further higher in hardness than the carburized layer of the plate portion.Type: ApplicationFiled: April 16, 2012Publication date: November 29, 2012Applicant: AISIN AW CO., LTD.Inventors: Daisuke IWATA, Tomoyuki HORI, Naoki YOKOYAMA, Koji OBAYASHI, Keita TAGUCHI, Hiroshi SHIBATA
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Publication number: 20120267010Abstract: A manufacturing method for a composite steel part including manufacturing a first steel part by preparing an intermediate product in which an extra portion is added, and heating the intermediate product to an austenitizing temperature in a carburizing atmosphere to form a carburized layer, cooling the intermediate product at a rate less than a cooling rate at which martensitic transformation is caused and in which the intermediate product is cooled to a temperature equal to or less than a temperature at which structure transformation due to the cooling is completed, heating the intermediate product to an austenitizing range by high-density energy and thereafter cooled at a rate equal to or more than the cooling rate at which martensitic transformation is caused to form a carburized quenched portion, cutting the extra portion of the intermediate product, and welding the first steel part and the second steel part to each other.Type: ApplicationFiled: April 6, 2012Publication date: October 25, 2012Applicant: AISIN AW CO., LTD.Inventors: Koji OBAYASHI, Daisuke KASAI, Keita TAGUCHI, Takaaki OGISO, Tsutomu SATO
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Publication number: 20120247249Abstract: A method of manufacturing a gear, and the resulting gear, the method resulting such that the surface layer portions of the tooth portions and a tooth root portion are made to be a carburized layer, the remaining portion of the tooth portions and a portion of a disk portion lying below the carburized layer be a quench-hardened layer, and a region of the disk portion lying deeper than the quench-hardened layer be an unquenched layer. The gear is manufactured using raw material steel having the following chemical composition: C: 0.1% to 0.40% (% by mass), Si: 0.35% to 3.0%, Mn: 0.1% to 3.0%, Cr: less than 0.2%, Mo: 0.1% or less, P: 0.03% or less, S: 0.15% or less, Al: 0.05% or less, N: 0.03% or less, and Fe and unavoidable impurities.Type: ApplicationFiled: April 8, 2011Publication date: October 4, 2012Applicants: NIPPON STEEL CORPORATION, AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Susumu Kato, Shuji Kozawa, Manabu Kubota, Yuji Adachi, Hirokazu Sato
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Publication number: 20120247619Abstract: A carburized steel member is manufactured by specific carburizing, cooling, and quenching steps. The steel member contains: C: 0.1% to 0.4%, Si: 0.35% to 3.0%, Mn: 0.1% to 3.0%, P: 0.03% or less, S: 0.15% or less, Al: 0.05% or less, and N: 0.03% or less, and a content of Cr is less than 0.2%, a content of Mo is 0.1% or less, and remainder is constituted of Fe and unavoidable impurities. A surface layer thereof includes: a first layer having a carbon concentration of 0.60 mass % to 0.85 mass % and including a martensitic structure in which no grain boundary oxide layer caused by Si exists; a second layer having a carbon concentration of 0.1 mass % to 0.4 mass % and including a martensitic structure; and a third layer having a carbon concentration of 0.1 mass % to 0.4 mass % and including no martensitic structure.Type: ApplicationFiled: April 8, 2011Publication date: October 4, 2012Applicants: NIPPON STEEL CORPORATION, AISIN AW CO., LTD.Inventors: Koji Obayashi, Keita Taguchi, Susumu Kato, Shuji Kozawa, Manabu Kubota, Yuji Adachi, Hirokazu Sato
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Publication number: 20090084470Abstract: A reduced-pressure heat treatment jig is used for supporting a workpiece of iron when the workpiece is subjected to heat treatment in a reduced-pressure atmosphere in which pressure is reduced compared to atmospheric pressure. The jig is formed of an iron material and is formed with a film on at least a contact surface with the workpiece, the film being formed of a material which persists during the heat treatment. The film preferably includes a metal oxide having an evaporating temperature higher than the heat treatment temperature in the reduced-pressure atmosphere. The film preferably contains aluminum oxide.Type: ApplicationFiled: September 25, 2008Publication date: April 2, 2009Applicant: AISIN AW CO., LTD.Inventors: Susumu KATO, Nozomu Shinkou, Moriyuki Tabata, Keita Taguchi, Kazuaki Okada