Patents by Inventor Eiji Amada
Eiji Amada 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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Publication number: 20220025475Abstract: A ripper shank as the impact and wear resistant component is made of a steel of a specific component composition which has a hardness of HRC 53 or more and HRC 57 or less. The steel includes a matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN. The steel does not include a M23C6 carbide.Type: ApplicationFiled: December 26, 2019Publication date: January 27, 2022Applicants: KOMATSU LTD., NIPPON STEEL CORPORATIONInventors: Eiji AMADA, Kouji KITAMURA, Kazuo MAEDA, Naomi KOBAYASHI, Takashi NODA, Mamoru HATANO, Takafumi AMATA, Yutaka NEISHI, Kei MIYANISHI, Ryoji NISHIJIMA, Daisuke TAKIGUCHI
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Patent number: 11186901Abstract: A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more: DI=7·(% C)1/2·(1+0.64·% Si)·(1+4.1·% Mn)·(1+2.83·% P)·(1?0.62·% S)·(1+2.33·% Cr)·(1+3.14·% Mo)??(1).Type: GrantFiled: March 9, 2016Date of Patent: November 30, 2021Assignee: KOMATSU LTD.Inventors: Eiji Amada, Akihiro Ochiai, Norimasa Tsunekage, Yuko Nagaki
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Patent number: 11162152Abstract: A bearing bushing for a track has an annular shape including an inner peripheral surface, an outer peripheral surface, a first end face, and a second end face located axially opposite the first end face. The bearing bushing for a track includes an inner peripheral surface-side hardened layer formed to include the inner peripheral surface, an outer peripheral surface-side hardened layer formed to include the outer peripheral surface, a first end face-side hardened layer formed to include the first end face and having a region with a hardness of 63 HRC or more that has a thickness of 3 mm or more from the first end face, and an unhardened region lower in hardness than the inner peripheral surface-side hardened layer, the outer peripheral surface-side hardened layer, and the first end face-side hardened layer, and including at least the second end face. The bearing bushing is made of steel.Type: GrantFiled: December 20, 2017Date of Patent: November 2, 2021Assignee: KOMATSU LTD.Inventors: Yusuke Kondo, Kazuo Maeda, Eiji Amada
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Publication number: 20210316801Abstract: A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide.Type: ApplicationFiled: August 22, 2019Publication date: October 14, 2021Applicants: KOMATSU LTD., NIPPON STEEL CORPORATIONInventors: Eiji AMADA, Kazuo MAEDA, Naomi KOBAYASHI, Takashi NODA, Mamoru HATANO, Takafumi AMATA, Yutaka NEISHI, Kei MIYANISHI, Ryoji NISHIJIMA
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Publication number: 20190329392Abstract: An inner-flanged bushing for a hydraulic breaker is a tubular shape having an inner flange and is made of a steel containing at least 0.55% and less than 0.70% by mass of carbon, at least 0.15% and less than 0.35% by mass of silicon, at least 0.4% and less than 0.9% by mass of manganese, at least 0.4% and less than 1.3% by mass of chromium, and at least 0.10% and less than 0.55% by mass of molybdenum, with the balance being iron and unavoidable impurities. The bushing includes a base region having a hardness of at least 30 HRC and less than 45 HRC, and a quench hardened layer formed on an inner periphery side of the base region to include an inner peripheral surface of a region including the inner flange, the quench hardened layer having a hardness of at least 55 HRC and less than 63 HRC.Type: ApplicationFiled: March 15, 2017Publication date: October 31, 2019Applicant: KOMATSU LTD.Inventors: Eiji AMADA, Tetsushi OKADA, Yoichi TAKAGI, Yusuke KONDO
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Publication number: 20190316220Abstract: A bearing bushing for a track has an annular shape including an inner peripheral surface, an outer peripheral surface, a first end face, and a second end face located axially opposite the first end face. The bearing bushing for a track includes an inner peripheral surface-side hardened layer formed to include the inner peripheral surface, an outer peripheral surface-side hardened layer formed to include the outer peripheral surface, a first end face-side hardened layer formed to include the first end face and having a region with a hardness of 63 HRC or more that has a thickness of 3 mm or more from the first end face, and an unhardened region lower in hardness than the inner peripheral surface-side hardened layer, the outer peripheral surface-side hardened layer, and the first end face-side hardened layer, and including at least the second end face. The bearing bushing is made of steel.Type: ApplicationFiled: December 20, 2017Publication date: October 17, 2019Applicant: KOMATSU LTD.Inventors: Yusuke KONDO, Kazuo MAEDA, Eiji AMADA
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Publication number: 20180087137Abstract: A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more: DI=7·(% C)1/2·(1+0.64·% Si)·(1+4.1·% Mn)·(1+2.83·% P)·(1?0.62·% S)·(1+2.33·% Cr)·(1+3.14·% Mo)??(1).Type: ApplicationFiled: March 9, 2016Publication date: March 29, 2018Applicant: KOMATSU LTD.Inventors: Eiji AMADA, Akihiro OCHIAI, Norimasa TSUNEKAGE, Yuko NAGAKI
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Patent number: 9790578Abstract: A steel for a tracked undercarriage component is used as a material constituting a track link (9), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.Type: GrantFiled: May 8, 2014Date of Patent: October 17, 2017Assignee: KOMATSU LTD.Inventors: Eiji Amada, Kazuo Maeda, Takeji Kajiura
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Publication number: 20150361534Abstract: A steel for a tracked undercarriage component is used as a material constituting a track link (9), for example, and contains: not less than 0.39% by mass and not more than 0.45% by mass of carbon, not less than 0.2% by mass and not more than 1.0% by mass of silicon, not less than 0.10% by mass and not more than 0.90% by mass of manganese, not less than 0.002% by mass and not more than 0.005% by mass of sulfur, not less than 0.1% by mass and not more than 3.0% by mass of nickel, not less than 0.70% by mass and not more than 1.50% by mass of chromium, and not less than 0.10% by mass and not more than 0.60% by mass of molybdenum, with the balance made of iron and unavoidable impurities.Type: ApplicationFiled: May 8, 2014Publication date: December 17, 2015Inventors: Eiji AMADA, Kazuo MAEDA, Takeji KAJIURA
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Patent number: 9009996Abstract: An excavating tooth includes a body and an abrasion-resistant layer. The abrasion-resistant layer has hardness higher than the body. The body includes a tip end face, a first face, a second face, a pair of first slope faces, and a pair of second slope faces. The abrasion-resistant layer includes a first abrasion-resistant layer section and a second abrasion-resistant layer section. The first abrasion-resistant layer section is formed on the tip end face. The second abrasion-resistant layer section is formed respectively on the pair of first slope faces and the pair of second slope faces. Thereby, it is possible to obtain an excavating tooth and a body for the excavating tooth capable of keeping a penetration force of a blade edge high in penetrating into an excavation subject.Type: GrantFiled: January 29, 2013Date of Patent: April 21, 2015Assignee: Komatsu Ltd.Inventors: Eiji Amada, Takanori Nagata, Kenichi Tanaka, Daijirou Itou
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Patent number: 8997383Abstract: A bucket tooth assembly is mounted to an adapter provided to a distal end part of a bucket of construction equipment. The bucket assembly includes a bucket tooth and a latching member. The bucket tooth has a cavity for inserting the adapter and a through-hole that is provided to the side face and communicates through to the adapter when the bucket tooth has been mounted to the adapter. The through-hole has a center axis. The latching member is fitted inside the through-hole and having a rotational axis disposed along a direction of the center axis and a bottom part provided to an end on an adapter side in an axial direction. The latching member is rotated to switch between a first state in which the bottom part is held inside the through-hole and a second state in which the bottom part protrudes toward a concave portion on the adapter side.Type: GrantFiled: April 26, 2012Date of Patent: April 7, 2015Assignee: Komatsu Ltd.Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
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Patent number: 8832975Abstract: A bucket tooth for a construction vehicle includes a through-hole formed in a side wall part and passing through to a cavity. The through-hole has on a cavity side a rotating body hole having a shape of a truncated and rotated cone that remains after removing a large diameter side portion obtained by cutting diagonally to a rotational axis of the truncated and rotated cone with a large diameter side of the truncated and rotated cone being disposed on the cavity side, and with the rotational axis of the truncated and rotated cone being inclined outwardly toward the distal end portion of the bucket tooth from the cavity along a width direction of the bucket tooth.Type: GrantFiled: May 7, 2012Date of Patent: September 16, 2014Assignee: Komatsu Ltd.Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
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Publication number: 20140215867Abstract: An excavating tooth includes a body and an abrasion-resistant layer. The abrasion-resistant layer has hardness higher than the body. The body includes a tip end face, a first face, a second face, a pair of first slope faces, and a pair of second slope faces. The abrasion-resistant layer includes a first abrasion-resistant layer section and a second abrasion-resistant layer section. The first abrasion-resistant layer section is formed on the tip end face. The second abrasion-resistant layer section is formed respectively on the pair of first slope faces and the pair of second slope faces. Thereby, it is possible to obtain an excavating tooth and a body for the excavating tooth capable of keeping a penetration force of a blade edge high in penetrating into an excavation subject.Type: ApplicationFiled: January 29, 2013Publication date: August 7, 2014Applicant: KOMATSU LTD.Inventors: Eiji Amada, Takanori Nagata, Kenichi Tanaka, Daijirou Itou
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Publication number: 20130152432Abstract: A bucket tooth for a construction vehicle includes a through-hole formed in a side wall part and passing through to a cavity. The through-hole has on a cavity side a rotating body hole having a shape of a truncated and rotated cone that remains after removing a large diameter side portion obtained by cutting diagonally to a rotational axis of the truncated and rotated cone with a large diameter side of the truncated and rotated cone being disposed on the cavity side, and with the rotational axis of the truncated and rotated cone being inclined outwardly toward the distal end portion of the bucket tooth from the cavity along a width direction of the bucket tooth.Type: ApplicationFiled: May 7, 2012Publication date: June 20, 2013Applicant: Komatsu Ltd.Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida
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Publication number: 20130152433Abstract: A bucket tooth assembly is mounted to an adapter provided to a distal end part of a bucket of construction equipment. The bucket assembly includes a bucket tooth and a latching member. The bucket tooth has a cavity for inserting the adapter and a through-hole that is provided to the side face and communicates through to the adapter when the bucket tooth has been mounted to the adapter. The through-hole has a center axis. The latching member is fitted inside the through-hole and having a rotational axis disposed along a direction of the center axis and a bottom part provided to an end on an adapter side in an axial direction. The latching member is rotated to switch between a first state in which the bottom part is held inside the through-hole and a second state in which the bottom part protrudes toward a concave portion on the adapter side.Type: ApplicationFiled: April 26, 2012Publication date: June 20, 2013Inventors: Daijirou Itou, Takanori Nagata, Eiji Amada, Tsuyoshi Yoshida