Patents by Inventor Kanji Namimatsu
Kanji Namimatsu 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: 9856996Abstract: An exhaust gas treatment unit includes an exhaust gas treatment device, a bracket and a connecting pipe. The exhaust gas treatment device is mounted on a bracket. The connecting pipe is connected to the exhaust gas treatment device. The connecting pipe directs exhaust gas to the exhaust gas treatment device. The connecting pipe may include a supporting portion and a pipe portion, with the supporting portion supporting the bracket and the pipe portion being integrated with the supporting portion. Alternatively, the exhaust gas treatment unit may further include a supporting member having a supporting portion supporting the bracket and a pipe portion integrated with the supporting portion, with the pipe portion connected to the connecting pipe.Type: GrantFiled: March 29, 2013Date of Patent: January 2, 2018Assignee: KOMATSU LTD.Inventors: Taira Ozaki, Hiroshi Nakagami, Hironori Yamamitsu, Kanji Namimatsu, Hiroshi Ohta, Kenji Matsubara
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Patent number: 9347350Abstract: An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.Type: GrantFiled: March 29, 2013Date of Patent: May 24, 2016Assignee: KOMATSU LTD.Inventors: Taira Ozaki, Hiroshi Nakagami, Hironori Yamamitsu, Kanji Namimatsu, Hiroshi Ohta, Kenji Matsubara
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Patent number: 8973353Abstract: An exhaust gas post-treatment unit includes a diesel particulate filtering device that treats engine exhaust gas, a selective catalyst reduction device that treats the engine exhaust gas, a connecting pipe, an injection device, a cooling water supply pipe and a cooling water return pipe. The connecting pipe connects the diesel particulate filtering device and the selective catalyst reduction device. The injection device is disposed on the connecting pipe and injects a reducing agent into the exhaust gas supplied to the selective catalyst reduction device. The a cooling water supply pipe guides cooling water to the injection device to cool the injection device. The cooling water return pipe discharges the cooling water from the injection device. At least one of the cooling water supply pipe and the cooling water return pipe has a convection section extending upward along the connecting pipe from a connecting portion with the injection device.Type: GrantFiled: March 15, 2013Date of Patent: March 10, 2015Assignee: Komatsu Ltd.Inventors: Masahiro Sawada, Takashi Katou, Kanji Namimatsu
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Patent number: 8932530Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, an inner pipe and a tubular guide member. The exhaust pipe includes an elbow part having a curved portion, and a linear part disposed downstream of the elbow part. The injector is disposed outside of the curved portion, and injects a reducing agent aqueous solution into the elbow part towards the linear part. The inner pipe is disposed downstream of the injector within the exhaust pipe. The inner pipe has an inlet portion opening facing the injector and an outer peripheral surface spaced apart from the inner wall of the linear part. The inner pipe allows the exhaust gas to flow through the inside of the inner pipe and along the outer periphery of the inner pipe. The tubular guide member directs the reducing agent aqueous solution injected from the injector to the inner pipe.Type: GrantFiled: April 18, 2012Date of Patent: January 13, 2015Assignee: Komatsu Ltd.Inventors: Tadashi Iijima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Patent number: 8916101Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, a mixing pipe and an inner pipe. The exhaust pipe includes an elbow part having a curved portion, and a linear part disposed downstream of the elbow part. The injector is disposed outside the curved portion and injects the reducing agent aqueous solution towards the linear part. The mixing pipe is disposed inside the elbow part to surround the reducing agent aqueous solution injected from the injector. The mixing pipe includes a plurality of openings on its outer peripheral surface. The inner pipe is disposed downstream of the mixing pipe and spaced apart from an outlet portion of the mixing pipe and from an inner wall of the linear part to allow the exhaust gas to flow through the inside of the inner pipe and along the outer periphery of the inner pipe.Type: GrantFiled: April 18, 2012Date of Patent: December 23, 2014Assignee: Komatsu Ltd.Inventors: Tadashi Iljima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Patent number: 8916100Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, a mixing pipe, an inner pipe and a flow section. The exhaust pipe includes an elbow part and a linear part. The injector is disposed in the elbow part and injects a reducing agent aqueous solution. The mixing pipe receives the reducing agent aqueous solution injected from the injector, and includes an outlet portion formed spaced apart from an inner wall of the exhaust pipe, and a plurality of openings formed on the outer peripheral surface thereof. The inner pipe is disposed in the linear part and allows the exhaust gas to flow through the inside and the outer periphery thereof. The flow section is formed between the outlet portion of the mixing pipe and the inner wall of the exhaust pipe to direct the exhaust gas to the inner pipe.Type: GrantFiled: April 18, 2012Date of Patent: December 23, 2014Assignee: Komatsu Ltd.Inventors: Tadashi Iijima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Publication number: 20140290781Abstract: An exhaust gas treatment unit includes an exhaust gas treatment device, a bracket and a connecting pipe. The exhaust gas treatment device is mounted on a bracket. The connecting pipe is connected to the exhaust gas treatment device. The connecting pipe directs exhaust gas to the exhaust gas treatment device. The connecting pipe may include a supporting portion and a pipe portion, with the supporting portion supporting the bracket and the pipe portion being integrated with the supporting portion. Alternatively, the exhaust gas treatment unit may further include a supporting member having a supporting portion supporting the bracket and a pipe portion integrated with the supporting portion, with the pipe portion connected to the connecting pipe.Type: ApplicationFiled: March 29, 2013Publication date: October 2, 2014Applicant: KOMATSU LTD.Inventors: Taira Ozaki, Hiroshi Nakagami, Hironori Yamamitsu, Kanji Namimatsu, Hiroshi Ohta, Kenji Matsubara
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Publication number: 20140290220Abstract: An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.Type: ApplicationFiled: March 29, 2013Publication date: October 2, 2014Applicant: KOMATSU LTD.Inventors: Taira Ozaki, Hiroshi Nakagami, Hironori Yamamitsu, Kanji Namimatsu, Hiroshi Ohta, Kenji Matsubara
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Publication number: 20140290222Abstract: An exhaust gas post-treatment unit includes a diesel particulate filtering device that treats engine exhaust gas, a selective catalyst reduction device that treats the engine exhaust gas, a connecting pipe, an injection device, a cooling water supply pipe and a cooling water return pipe. The connecting pipe connects the diesel particulate filtering device and the selective catalyst reduction device. The injection device is disposed on the connecting pipe and injects a reducing agent into the exhaust gas supplied to the selective catalyst reduction device. The a cooling water supply pipe guides cooling water to the injection device to cool the injection device. The cooling water return pipe discharges the cooling water from the injection device. At least one of the cooling water supply pipe and the cooling water return pipe has a convection section extending upward along the connecting pipe from a connecting portion with the injection device.Type: ApplicationFiled: March 15, 2013Publication date: October 2, 2014Inventors: Masahiro Sawada, Takashi Katou, Kanji Namimatsu
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Patent number: 8844286Abstract: An air cleaner includes a case in which an inner cylindrical filter and an outer cylindrical filter are housed, the case having a case body that defines an opening end surface closed by a cover member. The case includes an air inlet provided to an outer circumference of the case body for supplying outside air and an exhaust outlet provided to a bottom of the case body at a downstream side in an air-flowing direction for discharging the air supplied through the air inlet and filtered through the inner cylindrical filter and the outer cylindrical filter. A mass flow rate sensor is provided in the exhaust outlet to measure the flow rate of the air. A flow straightening grid is provided at the upstream side of the mass flow rate sensor to straighten the flow of the air.Type: GrantFiled: July 21, 2009Date of Patent: September 30, 2014Assignee: Komatsu Ltd.Inventors: Kanji Namimatsu, Tomohiro Shimazu, Tadashi Iijima
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Publication number: 20130164183Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, a mixing pipe, an inner pipe and a flow section. The exhaust pipe includes an elbow part and a linear part. The injector is disposed in the elbow part and injects a reducing agent aqueous solution. The mixing pipe is disposed to enclose a surrounding of the reducing agent aqueous solution injected from the injector, and includes an outlet portion formed spaced apart from an inner wall of the exhaust pipe, and a plurality of openings formed on the outer peripheral surface thereof. The inner pipe is disposed in the linear part and allows the exhaust gas to flow through the inside and the outer periphery thereof. The flow section is formed between the outlet portion of the mixing the inner wall of the exhaust pipe and directs the exhaust gas to the inner pipe.Type: ApplicationFiled: April 18, 2012Publication date: June 27, 2013Inventors: Tadashi Iijima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Publication number: 20130164181Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, an inner pipe and a tubular guide member. The exhaust pipe includes an elbow part having a curved portion, and a linear part disposed on a downstream side of the elbow part. The injector is disposed outside the curved portion and injects only a reducing agent aqueous solution into the elbow part towards the linear part. The inner pipe is disposed on an exhaust stream downstream side of the injector within the exhaust pipe with an inlet portion opening thereof facing the injector and an outer peripheral surface thereof being spaced apart from the inner wail of the linear art. The inner pipe allows the exhaust as to flow through the inside thereof and the outer periphery thereof. A tubular guide member directs the reducing agent aqueous solution injected from the injector to the inner pipe.Type: ApplicationFiled: April 18, 2012Publication date: June 27, 2013Inventors: Tadashi Iijima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Publication number: 20130164182Abstract: A reducing agent aqueous solution mixing device includes an exhaust pipe, an injector, a mixing pipe and an inner pipe. The exhaust pipe includes an elbow part having a curved portion, and a linear part disposed on the downstream side of the elbow part. The injector is disposed outside the curved portion and injects the reducing agent aqueous solution towards the linear part. The mixing pipe is disposed inside the elbow part to enclose a surrounding of the reducing agent aqueous solution injected from the injector, and includes a plurality of openings on an outer peripheral surface thereof. The inner pipe is disposed on the downstream side of the mixing pipe and spaced apart from an outlet portion of the mixing pipe and from an inner wall of the linear part, and allows the exhaust gas to flow through the inside thereof and the outer periphery thereof.Type: ApplicationFiled: April 18, 2012Publication date: June 27, 2013Applicant: KOMATSU LTD.Inventors: Tadashi Iijima, Hirofumi Kizawa, Boku Itou, Shinji Tsujimura, Takashi Katou, Tetsuo Orita, Kanji Namimatsu, Issei Hara, Hiroyuki Tomioka
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Publication number: 20110219768Abstract: An air cleaner includes a case in which an inner cylindrical filter and an outer cylindrical filter are housed, the case having a case body that defines an opening end surface closed by a cover member. The case includes an air inlet provided to an outer circumference of the case body for supplying outside air and an exhaust outlet provided to a bottom of the case body at a downstream side in an air-flowing direction for discharging the air supplied through the air inlet and filtered through the inner cylindrical filter and the outer cylindrical filter. A mass flow rate sensor is provided in the exhaust outlet to measure the flow rate of the air. A flow straightening grid is provided at the upstream side of the mass flow rate sensor to straighten the flow of the air.Type: ApplicationFiled: July 21, 2009Publication date: September 15, 2011Applicant: KOMATSU LTD.Inventors: Kanji Namimatsu, Tomohiro Shimazu, Tadashi Lijima
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Patent number: 7047942Abstract: Cylinder heads (100a to 100f are respectively provided with fuel injectors (101a to 101f). Each of the fuel injectors (101a to 101f) is connected to each of joints (105a to 105f) in a common rail (105) extending linearly through fuel injection pipes (103a to 103f). In this example, it can be achieved to allow all the fuel injection pipes (103a to 103f) to have the same length by crossing the injection pipes (103b, 103c, 103d and 103e) to connect. With this configuration, it is possible to reduce the irregularities in the amount of fuel injection and to enhance the engine performance.Type: GrantFiled: March 23, 2004Date of Patent: May 23, 2006Assignee: Komatsu Ltd.Inventors: Hatsuo Ando, Tatsuya Iwazaki, Kanji Namimatsu, Takumi Ito, Yasuyuki Onodera
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Patent number: 6868329Abstract: A control method of an EGR system of an engine capable of effectively performing an EGR control at a time of rapid acceleration. For this purpose, an intake air flow rate of the engine is obtained, and from a target EGR valve opening degree and a difference in pressure in front of and behind the EGR valve, a virtual EGR gas flow rate is arithmetically operated. A virtual EGR rate is obtained from the intake air flow rate, the fuel flow rate and the virtual EGR gas flow rate, and a difference from or a ratio to a target EGR rate obtained from the engine speed and the fuel flow rate is obtained. A command EGR valve opening degree is obtained from an EGR valve opening degree correction coefficient obtained from the difference or the ratio, and the target EGR valve opening degree, whereby the EGR vale is driven.Type: GrantFiled: October 14, 2003Date of Patent: March 15, 2005Assignee: Komatsu Ltd.Inventors: Takumi Ito, Yasuyuki Onodera, Kanji Namimatsu, Shuki Akushichi, Koichi Okaya
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Publication number: 20040194761Abstract: Cylinder heads 100a to 100f are respectively provided with fuel injectors 101a to 101f. Each of the fuel injectors 101a to 101f is connected to each of joints 105a to 105f in a common rail 105 extending linearly through fuel injection pipes 103a to 103f. In this example, it can be achieved to allow all the fuel injection pipes 103a to 103f to have the same length by crossing the injection pipes 103b, 103c, 103d and 103e to connect. With this configuration, it is possible to reduce the irregularities in the amount of fuel injection and to enhance the engine performance.Type: ApplicationFiled: March 23, 2004Publication date: October 7, 2004Inventors: Hatsuo Ando, Tatsuya Iwazaki, Kanji Namimatsu, Takumi Ito, Yasuyuki Onodera
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Publication number: 20040084031Abstract: A control method of an EGR system of an engine capable of effectively performing an EGR control at a time of rapid acceleration. For this purpose, an intake air flow rate of the engine is obtained, and from a target EGR valve opening degree and a difference in pressure in front of and behind the EGR valve, a virtual EGR gas flow rate is arithmetically operated. A virtual EGR rate is obtained from the intake air flow rate, the fuel flow rate and the virtual EGR gas flow rate, and a difference from or a ratio to a target EGR rate obtained from the engine speed and the fuel flow rate is obtained. A command EGR valve opening degree is obtained from an EGR valve opening degree correction coefficient obtained from the difference or the ratio, and the target EGR valve opening degree, whereby the EGR vale is driven.Type: ApplicationFiled: October 14, 2003Publication date: May 6, 2004Applicant: KOMATSU LTD.Inventors: Takumi Ito, Yasuyuki Onodera, Kanji Namimatsu, Shuki Akushichi, Koichi Okaya