Patents by Inventor Takazou Sotojima
Takazou Sotojima 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: 11835044Abstract: A rotary compressor includes a first cylinder, a first piston and a drive shaft. The drive shaft includes a first eccentric portion, a first shaft portion rotatably supported by a first bearing, and a first coupling portion coupling the first shaft portion with the first eccentric portion. The first piston is fitted to the first eccentric portion. The first shaft portion has a cylindrical shape coaxial with the rotational center axis. Re1?e1<R1. Re1 is a radius of the first eccentric portion. R1 is a radius of the first shaft portion. e1 is an eccentricity of the first eccentric portion. An outer surface of the first coupling portion does not extend radially out of an outer surface of the first eccentric portion. The first coupling portion includes a reinforcement portion with an outer surface positioned radially outside an outer surface of the first shaft portion.Type: GrantFiled: August 3, 2018Date of Patent: December 5, 2023Assignee: Daikin Industries, Ltd.Inventors: Takazou Sotojima, Hirofumi Higashi, Kousuke Nishimura
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Patent number: 11473581Abstract: A rotary compressor includes a first cylinder, a first piston and a drive shaft. The drive shaft includes a first eccentric portion, a first shaft portion rotatably supported by a first bearing, and a first coupling portion coupling the first shaft portion with the first eccentric portion. The first piston is fitted to the first eccentric portion. The first shaft portion has a cylindrical shape coaxial with the rotational center axis. Re1?e1<R1. Re1 is a radius of the first eccentric portion. R1 is a radius of the first shaft portion. e1 is an eccentricity of the first eccentric portion. An outer surface of the first coupling portion does not extend radially out of the outer surface of the first eccentric portion. A circumferentially extending groove is formed at an end of an inner peripheral surface of the first piston on a first coupling portion side in the axial direction of the drive shaft.Type: GrantFiled: August 3, 2018Date of Patent: October 18, 2022Assignee: Daikin Industries, Ltd.Inventors: Takazou Sotojima, Kousuke Nishimura, Hirofumi Higashi
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Patent number: 10968911Abstract: An oscillating piston compressor includes two oscillating compression units, and an introduction section configured to introduce an intermediate-pressure refrigerant into a compression chamber of each of the compression units. Each compression unit has a cylinder forming a cylinder chamber, a piston housed in the cylinder chamber, and a blade integrally formed with the piston. The piston rotates in the cylinder chamber while the blade oscillates. The two compression units are configured such that phases of the pistons are opposite to each other. The piston has a non-circular outer peripheral surface, and the cylinder chamber has an inner peripheral surface with a shape determined based on an envelope of the outer peripheral surface of the piston in rotation.Type: GrantFiled: February 23, 2017Date of Patent: April 6, 2021Assignee: Daikin Industries, Ltd.Inventors: Yukihiro Inada, Kazuhiro Furusho, Chihiro Endou, Takazou Sotojima
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Publication number: 20200200173Abstract: A rotary compressor includes a first cylinder, a first piston and a drive shaft. The drive shaft includes a first eccentric portion, a first shaft portion rotatably supported by a first bearing, and a first coupling portion coupling the first shaft portion with the first eccentric portion. The first piston is fitted to the first eccentric portion. The first shaft portion has a cylindrical shape coaxial with the rotational center axis. Re1?e1<R1. Re1 is a radius of the first eccentric portion. R1 is a radius of the first shaft portion. e1 is an eccentricity of the first eccentric portion. An outer surface of the first coupling portion does not extend radially out of an outer surface of the first eccentric portion. The first coupling portion includes a reinforcement portion with an outer surface positioned radially outside an outer surface of the first shaft portion.Type: ApplicationFiled: August 3, 2018Publication date: June 25, 2020Inventors: Takazou SOTOJIMA, Hirofumi HIGASHI, Kousuke NISHIMURA
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Publication number: 20200200176Abstract: A rotary compressor includes a first cylinder, a first piston and a drive shaft. The drive shaft includes a first eccentric portion, a first shaft portion rotatably supported by a first bearing, and a first coupling portion coupling the first shaft portion with the first eccentric portion. The first piston is fitted to the first eccentric portion. The first shaft portion has a cylindrical shape coaxial with the rotational center axis. Re1?e1<R1. Re1 is a radius of the first eccentric portion. R1 is a radius of the first shaft portion. e1 is an eccentricity of the first eccentric portion. An outer surface of the first coupling portion does not extend radially out of the outer surface of the first eccentric portion. A circumferentially extending groove is formed at an end of an inner peripheral surface of the first piston on a first coupling portion side in the axial direction of the drive shaft.Type: ApplicationFiled: August 3, 2018Publication date: June 25, 2020Inventors: Takazou SOTOJIMA, Kousuke NISHIMURA, Hirofumi HIGASHI
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Publication number: 20190085845Abstract: An oscillating piston compressor includes two oscillating compression units, and an introduction section configured to introduce an intermediate-pressure refrigerant into a compression chamber of each of the compression units. Each compression unit has a cylinder forming a cylinder chamber, a piston housed in the cylinder chamber, and a blade integrally formed with the piston. The piston rotates in the cylinder chamber while the blade oscillates. The two compression units are configured such that phases of the pistons are opposite to each other. The piston has a non-circular outer peripheral surface, and the cylinder chamber has an inner peripheral surface with a shape determined based on an envelope of the outer peripheral surface of the piston in rotation.Type: ApplicationFiled: February 23, 2017Publication date: March 21, 2019Inventors: Yukihiro INADA, Kazuhiro FURUSHO, Chihiro ENDOU, Takazou SOTOJIMA
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Patent number: 9284958Abstract: A rotary compressor includes a cylinder with a cylinder chamber, a piston, a blade and a pair of bushes. The piston is movable-within the cylinder chamber. The blade is integrally formed with the cylinder or piston and penetrates a groove formed in the other to segment the cylinder chamber into high and low pressure chambers. The bushes are provided at the groove and sandwich the blade from both sides of the blade. At least one of the pair of bushes includes an oil supply passage formed from a blade-side sliding surface to a groove-side sliding surface, a blade-side oil reservoir formed on the blade-side sliding surface, and a groove-side oil reservoir on the groove-side sliding surface. Ends of the oil supply passage open to the blade-side and groove-side oil reservoirs. The groove-side oil reservoir being wider than the blade-side oil reservoir.Type: GrantFiled: August 19, 2013Date of Patent: March 15, 2016Assignee: Daikin Industries, Ltd.Inventors: Yukihiro Inada, Takazou Sotojima, Yoshitaka Shibamoto, Kenichi Sata
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Patent number: 9243637Abstract: A scroll compressor includes a fixed scroll and an orbiting scroll. Each of the fixed and orbiting scrolls includes an end plate and a spiral wrap standing on a front surface of the end plate. The scrolls are arranged such that the front surfaces of the end plates face each other and the wraps are engaged with each other. The orbiting scroll eccentrically rotates, without turning on an axis thereof, with respect to the fixed scroll to compress fluid in compression chambers respectively formed inside and outside the wrap of the orbiting scroll. Each wrap is formed in a shape such that at least one of the compression chambers serves as a rate-reduced compression chamber where a volume change rate thereof is reduced in a middle of a compression phase.Type: GrantFiled: June 22, 2012Date of Patent: January 26, 2016Assignee: Daikin Industries, Ltd.Inventors: Yukihiro Inada, Takazou Sotojima, Yoshitaka Shibamoto, Kenichi Sata, Kazuhiko Matsukawa
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Publication number: 20150240815Abstract: A rotary compressor includes a cylinder with a cylinder chamber, a piston, a blade and a pair of bushes. The piston is movable-within the cylinder chamber. The blade is integrally formed with the cylinder or piston and penetrates a groove formed in the other to segment the cylinder chamber into high and low pressure chambers. The bushes are provided at the groove and sandwich the blade from both sides of the blade. At least one of the pair of bushes includes an oil supply passage formed from a blade-side sliding surface to a groove-side sliding surface, a blade-side oil reservoir formed on the blade-side sliding surface, and a groove-side oil reservoir on the groove-side sliding surface. Ends of the oil supply passage open to the blade-side and groove-side oil reservoirs. The groove-side oil reservoir being wider than the blade-side oil reservoir.Type: ApplicationFiled: August 19, 2013Publication date: August 27, 2015Inventors: Yukihiro Inada, Takazou Sotojima, Yoshitaka Shibamoto, Kenichi Sata
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Publication number: 20150037189Abstract: A scroll compressor includes a fixed scroll and an orbiting scroll. Each of the fixed and orbiting scrolls includes an end plate and a spiral wrap standing on a front surface of the end plate. The scrolls are arranged such that the front surfaces of the end plates face each other and the wraps are engaged with each other. The orbiting scroll eccentrically rotates, without turning on an axis thereof, with respect to the fixed scroll to compress fluid in compression chambers respectively formed inside and outside the wrap of the orbiting scroll. Each wrap is formed in a shape such that at least one of the compression chambers serves as a rate-reduced compression chamber where a volume change rate thereof is reduced in a middle of a compression phase.Type: ApplicationFiled: June 22, 2012Publication date: February 5, 2015Inventors: Yukihiro Inada, Takazou Sotojima, Yoshitaka Shibamoto, Kenichi Sata, Kazuhiko Matsukawa
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Patent number: 8936448Abstract: A rotary compressor includes a cylinder having an annular cylinder space, a piston eccentrically disposed relative to the cylinder, and a drive shaft (53) connected to the piston. The piston has a piston portion eccentrically rotatable relative to the cylinder, and a piston end plate closing the cylinder space. The cylinder has an end plate storage space storing the piston end plate in an eccentrically rotatable manner. The cylinder space forms a main cylinder chamber, and the end plate storage space forms a sub-cylinder chamber.Type: GrantFiled: March 18, 2011Date of Patent: January 20, 2015Assignee: Daikin Industries, Ltd.Inventors: Tetsuya Okamoto, Yoshitaka Shibamoto, Kazuhiro Furusho, Takazou Sotojima, Takayuki Kawano, Hiroshi Yoh
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Patent number: 8454333Abstract: A rotary fluid machine includes a cylinder with an annular cylinder chamber, an annular piston and a blade. The annular piston is disposed in the cylinder chamber so as to be eccentric to the cylinder. The annular piston divides the cylinder chamber into an outer cylinder chamber and an inner cylinder chamber. The blade is arranged in the cylinder chambers to divide each of the outer and inner cylinder chambers into a high-pressure chamber and a low-pressure chamber. The cylinder and the piston are arranged to eccentrically move relative to each other. A height of the outer cylinder chamber is different from a height of the inner cylinder chamber as measured in a direction of a rotational axis of the rotary fluid machine.Type: GrantFiled: September 26, 2008Date of Patent: June 4, 2013Assignee: Daikin Industries, Ltd.Inventors: Takazou Sotojima, Yoshitaka Shibamoto, Takashi Shimizu
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Patent number: 8419395Abstract: A compressor includes a compression mechanism having lower and upper stage compression chambers. Refrigerant compressed in the lower-stage compression chamber is further compressed in the higher-stage compression chamber. An intermediate injection pipe is arranged to inject refrigerant between the lower-stage and the higher-stage compression chambers. The compression mechanism includes at least one fixed member having a fixed end plate, and at least one movable member having a movable end plate section facing the fixed end plate with at least one of the compression chambers interposed between the end plate sections. At least one intermediate back pressure chamber is formed to face a back surface of the movable end plate section. The intermediate back pressure chamber communicates with a discharge side of the lower-stage compression chamber, and is arranged such that internal pressure of the intermediate back pressure chamber acts on the movable end plate section.Type: GrantFiled: February 4, 2009Date of Patent: April 16, 2013Assignee: Daikin Industries, Ltd.Inventors: Kazuhiro Furusho, Yoshitaka Shibamoto, Takashi Shimizu, Takazou Sotojima
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Patent number: 8353693Abstract: A fluid machine includes an inflow passageway arranged and configured to introduce fluid from outside into inner and outer fluid chambers of a first eccentric rotation mechanism, a communication passageway arranged and configured to introduce fluid discharged from the inner and outer fluid chambers of the first eccentric rotation mechanism into inner and outer fluid chambers of a second eccentric rotation mechanism, and an outflow passageway arranged and configured to allow fluid discharged from the inner and outer fluid chambers of the second eccentric rotation mechanism to flow to outside. Each of the first and second eccentric rotation mechanisms preferably includes a cylinder, a piston, and a blade. A drive shaft has a main shaft portion and first and second eccentric portions arranged to engage the first and second eccentric rotation mechanisms.Type: GrantFiled: February 4, 2009Date of Patent: January 15, 2013Assignee: Daikin Industries, Ltd.Inventors: Takazou Sotojima, Yoshitaka Shibamoto, Takashi Shimizu, Kazuhiro Furusho
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Publication number: 20130011290Abstract: A rotary compressor includes a cylinder having an annular cylinder space, a piston eccentrically disposed relative to the cylinder, and a drive shaft (53) connected to the piston. The piston has a piston portion eccentrically rotatable relative to the cylinder, and a piston end plate closing the cylinder space. The cylinder has an end plate storage space storing the piston end plate in an eccentrically rotatable manner. The cylinder space forms a main cylinder chamber, and the end plate storage space forms a sub-cylinder chamber.Type: ApplicationFiled: March 18, 2011Publication date: January 10, 2013Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tetsuya Okamoto, Yoshitaka Shibamoto, Kazuhiro Furusho, Takazou Sotojima, Takayuki Kawano, Hiroshi Yoh
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Patent number: 8323009Abstract: A rotary-type fluid machine includes a compression mechanism having piston mechanisms arranged one on top of the other and a drive mechanism having a drive shaft that is configured and arranged to drive the piston mechanisms. Each of the two piston mechanisms includes a cylinder member with a cylinder chamber, a piston member housed eccentrically in the cylinder chamber such that the cylinder chamber is partitioned into first and second compression chambers. A phase difference of 90 degrees in volume change is made between the cylinder chambers of the two piston mechanisms. A movable one of the cylinder and piston has a first surface facing one of the first cylinder chambers and a second surface facing one of the second cylinder chambers, with a surface area of the first surface being equal to a surface area of the second surface.Type: GrantFiled: January 23, 2009Date of Patent: December 4, 2012Assignee: Daikin Industries, Ltd.Inventors: Takashi Shimizu, Yoshitaka Shibamoto, Takazou Sotojima, Masanori Masuda
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Publication number: 20110179822Abstract: A refrigerating apparatus in which a two-stage compression refrigeration cycle is performed includes a refrigerant circuit and a volume ratio changing unit. The refrigerant circuit is connected to a compressor having a plurality of compression mechanisms mechanically connected together with a single drive shaft. The compression mechanisms include four cylinder chambers. The volume ratio changing unit is configured to change a ratio of a suction volume of a low-pressure compression mechanism to a suction volume of a high-pressure compression mechanism.Type: ApplicationFiled: September 8, 2009Publication date: July 28, 2011Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takazou Sotojima, Yoshitaka Shibamoto
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Patent number: 7878778Abstract: A rotary compressor includes a fixed side and a movable side that is eccentrically movable relative to the fixed side. The movable side moves in response to operation of a drive mechanism, which rotates a drive shaft. The fixed side has a main bearing formed as a unitary part. A cylinder may serve as the movable side, which is coupled through an eccentric part to the drive shaft. The drive shaft is supported by the main bearing. With such an arrangement, a ring-shaped piston may serve as the fixed side, which is formed integrally with the main bearing in a front head.Type: GrantFiled: October 19, 2006Date of Patent: February 1, 2011Assignee: Daikin Industries, Ltd.Inventors: Takashi Shimizu, Yoshitaka Shibamoto, Kazuhiro Furusho, Takazou Sotojima, Masanori Masuda
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Publication number: 20100326128Abstract: A fluid machine includes an inflow passageway arranged and configured to introduce fluid from outside into inner and outer fluid chambers of a first eccentric rotation mechanism, a communication passageway arranged and configured to introduce fluid discharged from the inner and outer fluid chambers of the first eccentric rotation mechanism into inner and outer fluid chambers of a second eccentric rotation mechanism, and an outflow passageway arranged and configured to allow fluid discharged from the inner and outer fluid chambers of the second eccentric rotation mechanism to flow to outside. Each of the first and second eccentric rotation mechanisms preferably includes a cylinder, a piston, and a blade. A drive shaft has a main shaft portion and first and second eccentric portions arranged to engage the first and second eccentric rotation mechanisms.Type: ApplicationFiled: February 4, 2009Publication date: December 30, 2010Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takazou Sotojima, Yoshitaka Shibamoto, Takashi Shimizu, Kazuhiro Furusho
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Publication number: 20100319394Abstract: A compressor includes a compression mechanism having lower and upper stage compression chambers. Refrigerant compressed in the lower-stage compression chamber is further compressed in the higher-stage compression chamber. An intermediate injection pipe is arranged to inject refrigerant between the lower-stage and the higher-stage compression chambers. The compression mechanism includes at least one fixed member having a fixed end plate, and at least one movable member having a movable end plate section facing the fixed end plate with at least one of the compression chambers interposed between the end plate sections. At least one intermediate back pressure chamber is formed to face a back surface of the movable end plate section. The intermediate back pressure chamber communicates with a discharge side of the lower-stage compression chamber, and is arranged such that internal pressure of the intermediate back pressure chamber acts on the movable end plate section.Type: ApplicationFiled: February 4, 2009Publication date: December 23, 2010Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Kazuhiro Furusho, Yoshitaka Shibamoto, Takashi Shimizu, Takazou Sotojima