Patents by Inventor Hiroki Naganawa
Hiroki Naganawa 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: 9669499Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be radially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.Type: GrantFiled: November 30, 2010Date of Patent: June 6, 2017Assignees: DENSO CORPORATION, DENSO AIRS CORPORATIONInventors: Fumiaki Nakamura, Yoshiaki Takano, Shun Kurata, Takahisa Suzuki, Takashi Ono, Hiroki Naganawa, Kinji Ochiai, Hiroki Ohara
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Publication number: 20140109373Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be radially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.Type: ApplicationFiled: December 23, 2013Publication date: April 24, 2014Applicants: DENSO AIR SYSTEMS CORPORATION, DENSO CORPORATIONInventors: Fumiaki NAKAMURA, Yoshiaki TAKANO, Shun KURATA, Takahisa SUZUKI, Takashi ONO, Hiroki NAGANAWA, Kinji OCHIAI, Hiroki OHARA
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Patent number: 8251101Abstract: A refrigerant piping unit includes a pipe and a joint coupled to the pipe. The pipe includes a main section, an end section and a bent section between the main section and the end section. The end section includes a flange portion adjacent to the bent section and a thick end portion opposite to the bent portion with respect to the flange portion in an axial direction. The flange portion is expanded in a radially outward direction and is engaged with the joint. The thick end portion is expanded in the radially outward direction and has a thickness greater than a thickness of the main section. The thick end portion has a groove on its outer surface. The end section has a flat inner surface extending continuously from an inner surface of the bent section throughout inside of the flange portion and the thick end portion.Type: GrantFiled: December 9, 2008Date of Patent: August 28, 2012Assignees: Denso Corporation, GAC CorporationInventors: Makoto Yoshino, Hiroki Naganawa, Naka Shibata, Masakazu Kondou
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Patent number: 7926853Abstract: A pipe joint structure includes a plurality of fluid flow path portions, a socket connected to the fluid flow path portions, a connection plate disposed to abut against the socket, a plurality of pipes connected to each other by the connection plate, and a seal member disposed between the plurality of pipes and the socket. The socket includes a connection portion that is located to cover an edge of the connection plate and to fix the plurality of pipes to the plurality of fluid flow path portions. The pipe joint structure can be suitably used for a heat exchanger.Type: GrantFiled: February 15, 2007Date of Patent: April 19, 2011Assignee: DENSO CorporationInventors: Yoshiki Katoh, Mitsugu Nakamura, Arinori Shimizu, Sadayuki Kamiya, Hiroki Naganawa, Takaharu Nagoya, Takayuki Hirose
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Publication number: 20110073208Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be radially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.Type: ApplicationFiled: November 30, 2010Publication date: March 31, 2011Applicants: DENSO CORPORATION, DENSO AIRS CORPORATIONInventors: Fumiaki Nakamura, Yoshiaki Takano, Shun Kurata, Takahisa Suzuki, Takashi Ono, Hiroki Naganawa, Kinji Ochiai, Hiroki Ohara
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Patent number: 7887099Abstract: A compound tube is disclosed that includes an outer tube and an inner tube disposed in the outer tube. A passage is defined between the outer tube and the inner tube. Various methods of joining the outer tube to the inner tube are disclosed.Type: GrantFiled: December 5, 2006Date of Patent: February 15, 2011Assignees: DENSO Corporation, DENSO Airs CorporationInventors: Shun Kurata, Hiroki Naganawa, Fumiaki Nakamura, Kinji Ochiai, Hiroki Ohara
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Patent number: 7886420Abstract: A method of manufacturing a double pipe includes a step of inserting a straight inner pipe into a straight outer pipe such that the inner pipe and the outer pipe are positioned at a predetermined relative position, a step of fixing a first end portion of the outer pipe to the inner pipe so as to form a first fixing portion, a step of bending the outer pipe and the inner pipe at the same time at a predetermined portion so as to form at least one bending portion after the fixing step of the first end portion, and a step of fixing a second end portion of the outer pipe to the inner pipe so as to form a second end portion after the bending.Type: GrantFiled: December 28, 2006Date of Patent: February 15, 2011Assignees: Denso Corporation, DENSO Airs CorporationInventors: Hiroki Naganawa, Shun Kurata, Fumiaki Nakamura, Kinji Ochiai, Hiroki Ohara, Hiroki Oguchi
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Patent number: 7866378Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.Type: GrantFiled: November 8, 2005Date of Patent: January 11, 2011Assignees: Denso Corporation, Denso Airs CorporationInventors: Fumiaki Nakamura, Yoshiaki Takano, Shun Kurata, Takahisa Suzuki, Takashi Ono, Hiroki Naganawa, Kinji Ochiai, Hiroki Ohara
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Publication number: 20090145152Abstract: A refrigerant piping unit includes a pipe and a joint coupled to the pipe. The pipe includes a main section, an end section and a bent section between the main section and the end section. The end section includes a flange portion adjacent to the bent section and a thick end portion opposite to the bent portion with respect to the flange portion in an axial direction. The flange portion is expanded in a radially outward direction and is engaged with the joint. The thick end portion is expanded in the radially outward direction and has a thickness greater than a thickness of the main section. The thick end portion has a groove on its outer surface. The end section has a flat inner surface extending continuously from an inner surface of the bent section throughout inside of the flange portion and the thick end portion.Type: ApplicationFiled: December 9, 2008Publication date: June 11, 2009Applicants: DENSO CORPORATION, GAC CorporationInventors: Makoto Yoshino, Hiroki Naganawa, Naka Shibata, Masakazu Kondou
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Publication number: 20080030023Abstract: A compound tube is disclosed that includes an outer tube and an inner tube disposed in the outer tube. A passage is defined between the outer tube and the inner tube. Various methods of joining the outer tube to the inner tube are disclosed.Type: ApplicationFiled: December 5, 2006Publication date: February 7, 2008Applicants: DENSO Corporation, DENSO Airs CorporationInventors: Shun Kurata, Hiroki Naganawa, Fumiaki Nakamura, Kinji Ochiai, Hiroki Ohara
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Publication number: 20070246117Abstract: A method of manufacturing a double pipe includes a step of inserting a straight inner pipe into a straight outer pipe such that the inner pipe and the outer pipe are positioned at a predetermined relative position, a step of fixing a first end portion of the outer pipe to the inner pipe so as to form a first fixing portion, a step of bending the outer pipe and the inner pipe at the same time at a predetermined portion so as to form at least one bending portion after the fixing step of the first end portion, and a step of fixing a second end portion of the outer pipe to the inner pipe so as to form a second end portion after the bending.Type: ApplicationFiled: December 28, 2006Publication date: October 25, 2007Applicants: DENSO Corporation, DENSO Airs CorporationInventors: Hiroki Naganawa, Shun Kurata, Fumiaki Nakamura, Kinji Ochiai, Hiroki Ohara, Hiroki Oguchi
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Publication number: 20070205598Abstract: A pipe joint structure includes a plurality of fluid flow path portions, a socket connected to the fluid flow path portions, a connection plate disposed to abut against the socket, a plurality of pipes connected to each other by the connection plate, and a seal member disposed between the plurality of pipes and the socket. The socket includes a connection portion that is located to cover an edge of the connection plate and to fix the plurality of pipes to the plurality of fluid flow path portions. The pipe joint structure can be suitably used for a heat exchanger.Type: ApplicationFiled: February 15, 2007Publication date: September 6, 2007Applicant: DENSO CorporationInventors: Yoshiki Katoh, Mitsugu Nakamura, Arinori Shimizu, Sadayuki Kamiya, Hiroki Naganawa, Takaharu Nagoya, Takayuki Hirose
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Patent number: 7249467Abstract: A gas-liquid separator (accumulator) is arranged at a refrigerant suction side of a compressor of a refrigerant cycle system mounted in a vehicle. The gas-liquid separator includes a gas-liquid separation portion for separating refrigerant into gas refrigerant and liquid refrigerant, and a liquid refrigerant storage portion for storing therein the separated liquid refrigerant. In the gas-liquid separator, the gas-liquid separation portion is arranged approximately vertically, and the liquid refrigerant storage portion is arranged approximately horizontally with respect to the approximately vertically arranged gas-liquid separation portion. Therefore, mounting performance of the gas-liquid separator in the vehicle can be effectively improved while gas-liquid separation can be accurately performed.Type: GrantFiled: May 27, 2004Date of Patent: July 31, 2007Assignee: DENSO CorporationInventors: Shin Nishida, Syuichi Mizuno, Hiroki Naganawa
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Publication number: 20060096744Abstract: A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.Type: ApplicationFiled: November 8, 2005Publication date: May 11, 2006Applicants: DENSO Corporation, DENSO Airs CorporationInventors: Fumiaki Nakamura, Yoshiaki Takano, Shun Kurata, Takahisa Suzuki, Takashi Ono, Hiroki Naganawa, Kinji Ochiai, Hiroki Ohara
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Publication number: 20040237577Abstract: A gas-liquid separator (accumulator) is arranged at a refrigerant suction side of a compressor of a refrigerant cycle system mounted in a vehicle. The gas-liquid separator includes a gas-liquid separation portion for separating refrigerant into gas refrigerant and liquid refrigerant, and a liquid refrigerant storage portion for storing therein the separated liquid refrigerant. In the gas-liquid separator, the gas-liquid separation portion is arranged approximately vertically, and the liquid refrigerant storage portion is arranged approximately horizontally with respect to the approximately vertically arranged gas-liquid separation portion. Therefore, mounting performance of the gas-liquid separator in the vehicle can be effectively improved while gas-liquid separation can be accurately performed.Type: ApplicationFiled: May 27, 2004Publication date: December 2, 2004Inventors: Shin Nishida, Syuichi Mizuno, Hiroki Naganawa