Patents by Inventor Suguru Hirota
Suguru Hirota 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: 20180128252Abstract: A variable displacement swash plate type compressor includes a crank chamber, a suction chamber, a drive shaft, a swash plate, and a bleeding passage connecting the crank chamber and the suction chamber. The bleeding passage has an axial passage and first and second radial passages in the drive shaft. The second radial passage opens on an outer peripheral surface of the drive shaft at a position that is closer to the swash plate than the first radial passage. The first radial passage is in constant communication with the crank chamber. The drive shaft has a valve member that is movable in the axial direction with the swash plate. The second radial passage is connected to the crank chamber when the swash plate is at maximum or minimum inclination angles and disconnected from the crank chamber by the valve member when the swash plate is at an intermediate inclination angle.Type: ApplicationFiled: November 3, 2017Publication date: May 10, 2018Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKIInventors: Kenji YAMAMOTO, Noriaki SATAKE, Shinichi KAKEGAWA, Hiroshi KUBO, Suguru HIROTA, Tomoji TARUTANI
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Publication number: 20080047424Abstract: A variable displacement compressor comprising a cylinder block having a plurality of cylinder bores. The cylinder block has an extension which extends from an outer periphery of an end surface of the cylinder block which faces a swash plate. The extension has an extension surface which forms a part of a bore surface of each cylinder bore and first and second wall surfaces which extend continuously from opposite ends of the extension surface in a circumferential direction of the extension surface. A part of each extension surface which is connected to the first wall surface which is located on a preceding side of rotation of the swash plate corresponds to a high-load area which is locally subjected to loads from a single-headed piston during a compression stroke. The high-load area has a chamfered region which is formed into a curved surface by chamfering.Type: ApplicationFiled: August 23, 2007Publication date: February 28, 2008Inventors: Suguru Hirota, Hiroshi Uneyama, Junya Yano, Hiroaki Kayukawa
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Patent number: 7204098Abstract: The present invention relates to a structure for separating oil from a refrigerant gas containing the oil. The refrigerant gas is discharged from a refrigerant compressor which forms a part of refrigerating cycle to an external refrigerant circuit. The oil separation structure includes a separation chamber in which the oil is separated from the discharge refrigerant gas having a cylindrical inner surface, and a plurality of introduction passages through which the discharge refrigerant gas is introduced into the separation chamber. The oil is separated by centrifugal action from the discharge refrigerant gas by turning the discharge refrigerant gas introduced into the separation chamber along the cylindrical inner surface.Type: GrantFiled: April 28, 2004Date of Patent: April 17, 2007Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Yoshinari Yamada, Suguru Hirota, Hajime Kurita
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Patent number: 6912783Abstract: In a manufacturing method of a valve plate for a compressor according to this invention, a punch die 43 formed with a convex and concave configuration at its tip end face 42 is set at a press machine 41, and the punch die 43 is depressed against a surface of a valve plate 9 to transfer the convex and concave configuration of the tip end face 42. Thus, peripheral portions of a suction port and a discharge port of the valve plate 9 are roughened.Type: GrantFiled: February 19, 2002Date of Patent: July 5, 2005Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Hirohiko Tanaka, Suguru Hirota, Atsushi Shibata, Takeshi Kondo, Mitsuru Hattori, Eiji Tokunaga, Tetsuhiko Fukanuma, Masakazu Hashimoto, Hiromi Yoshino
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Patent number: 6837948Abstract: A process of production of a compressor shoe superior in durability and reduced in manufacturing cost, wherein a process of quenching the shoe is performed in a vacuum, inert gas, or modified gas so as to prevent oxidation of the chrome and manganese of the surface of the material or the quenching process is performed after forming an antioxidation film on the surface of the material to prevent the oxidation of the chrome and manganese.Type: GrantFiled: May 31, 2002Date of Patent: January 4, 2005Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Yoshitami Kondo, Masanobu Tomita, Yasuhiro Miura, Hironobu Tsushima, Suguru Hirota
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Publication number: 20040221610Abstract: The present invention relates to a structure for separating oil from a refrigerant gas containing the oil. The refrigerant gas is discharged from a refrigerant compressor which forms a part of refrigerating cycle to an external refrigerant circuit. The oil separation structure includes a separation chamber in which the oil is separated from the discharge refrigerant gas having a cylindrical inner surface, and a plurality of introduction passages through which the discharge refrigerant gas is introduced into the separation chamber. The oil is separated by centrifugal action from the discharge refrigerant gas by turning the discharge refrigerant gas introduced into the separation chamber along the cylindrical inner surface.Type: ApplicationFiled: April 28, 2004Publication date: November 11, 2004Inventors: Yoshinari Yamada, Suguru Hirota, Hajime Kurita
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Publication number: 20030163919Abstract: In a manufacturing method of a valve plate for a compressor according to this invention, a punch die 43 formed with a convex and concave configuration at its tip end face 42 is set at a press machine 41, and the punch die 43 is depressed against a surface of a valve plate 9 to transfer the convex and concave configuration of the tip end face 42. Thus, peripheral portions of a suction port and a discharge port of the valve plate 9 are roughened.Type: ApplicationFiled: March 18, 2003Publication date: September 4, 2003Inventors: Hirohiko Tanaka, Suguru Hirota, Atsushi Shibata, Takeshi Kondo, Mitsuru Hattori, Eiji Tokunaga, Tetsuhiko Fukanuma, Masakazu Hashimoto, Hiromi Yoshino
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Publication number: 20020189717Abstract: A process of production of a compressor shoe superior in durability and reduced in manufacturing cost, wherein a process of quenching the shoe is performed in a vacuum, inert gas, or modified gas so as to prevent oxidation of the chrome and manganese of the surface of the material or the quenching process is performed after forming an antioxidation film on the surface of the material to prevent the oxidation of the chrome and manganese.Type: ApplicationFiled: May 31, 2002Publication date: December 19, 2002Applicant: Kabushiki Kaisha Toyota JidoshokkiInventors: Yoshitami Kondo, Masanobu Tomita, Yasuhiro Miura, Hironobu Tsushima, Suguru Hirota
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Patent number: 6283722Abstract: A variable displacement type swash plate compressor that prevents a drive shaft from moving axially when the difference between a crank chamber pressure and a cylinder bore pressure becomes excessive. A hinge mechanism has a support arm extending from a lug plate and a guide pin extends from a swash plate. The head portion of the guide pin fits in a guide hole formed in the support arm. A cutaway surface is formed in a part of the support arm that defines the guide hole. The cutaway surface forms a clearance in the hinge. The clearance permits the swash plate to move without pulling the drive shaft.Type: GrantFiled: March 31, 2000Date of Patent: September 4, 2001Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kenji Takenaka, Hiroaki Kayukawa, Tetsuhiko Fukanuma, Masahiro Kawaguchi, Hideki Mizutani, Suguru Hirota, Hiroyuki Nakaima
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Patent number: 6186048Abstract: A variable displacement compressor includes a rotor, which is fixed to a drive shaft, and a pivotal swash plate, which is supported on the drive shaft and slides in an axial direction along the drive shaft. A hinge mechanism is located between the rotor and the swash plate. The hinge mechanism rotates the swash plate integrally with the rotor and guides the pivoting and the sliding motion of the swash plate. The hinge mechanism includes a swing arm, which extends from the swash plate. The swash plate is made of aluminum or aluminum alloy material. The swing arm is separate from the swash plate and is made of iron-based metal material. Therefore, while the swash plate is light, the hinge mechanism is strong.Type: GrantFiled: January 4, 1999Date of Patent: February 13, 2001Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kazuya Kimura, Hiroaki Kayukawa, Suguru Hirota, Keiichi Kato
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Patent number: 6179578Abstract: A compressor includes a compressing mechanism for compressing refrigerant gas and an oil separator for separating the oil from the gas. The separated oil is used to lubricate the compressor. The compressor has a discharge passage to permit refrigerant gas to flow out of the compressor, a recess located in the discharge passage, a plug press fitted in the recess and a supply passage for returning the separated oil to the compressor. The plug and the recess define a separation chamber having a circular cross-section and an annular chamber. The separation chamber is connected with the annular chamber by an outlet passage formed in the plug. The refrigerant gas swirls along the wall of the separation chamber, which separates the oil from the gas. Since the plug is press fitted in the recess, installation of the plug is facilitated. This structure also prevents the plug from loosening.Type: GrantFiled: June 11, 1999Date of Patent: January 30, 2001Assignee: Kabushiki Kaisha Toyoda Jidishokki SeisakushoInventors: Hiroaki Kayukawa, Shigeyuki Hidaka, Suguru Hirota, Kenta Nakauchi
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Patent number: 6162026Abstract: A reciprocating piston type compressor for compressing refrigerant gas for an automobile air conditioning system is improved to protect itself without protective control by a computer. The compressor detects the temperature of a part of the compressor in which the temperature increases to higher than a predetermined critical temperature when the compressor malfunctions, and changes a displacement control valve to reduce the displacement of the compressor when the detected temperature is higher than the predetermined critical temperature.Type: GrantFiled: November 27, 1998Date of Patent: December 19, 2000Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kazuya Kimura, Kiyohiro Yamada, Suguru Hirota, Shiro Hayashi
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Patent number: 5823294Abstract: A compressor compresses gas containing misted oil. The compressor has a drive plate located in a crank chamber and mounted on a drive shaft and a piston operably coupled to the drive plate and located in a cylinder bore. The drive plate converts rotation of the drive shaft to reciprocating movement of the piston in the cylinder bore to vary the capacity of the cylinder bore. The piston compresses gas supplied to the cylinder bore and discharges the compressed gas from the compressor by way of a discharge chamber and a discharge passage. An oil separating mechanism is disposed midway in the discharge passage to separate the oil from the gas flowing in the discharge passage. A storing chamber is defined in the lower portion of the separating mechanism to store the oil separated from the gas. A supplying passage connects the storing chamber with the crank chamber to supply the oil to the crank chamber from the storing chamber. A supplying valve is disposed midway in the supplying passage.Type: GrantFiled: June 5, 1997Date of Patent: October 20, 1998Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Hideki Mizutani, Hiroaki Kayukawa, Suguru Hirota, Fuminobu Enokijima
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Patent number: 5784950Abstract: A single headed swash plate type compressor including, a housing with a crank chamber and cylinder bore, pistons arranged in cylinder bores, and a swash plate driven by a drive shaft. Each of the pistons has at one end thereof a bearing having axially spaced first and second bearing portions and an axially extending third portion interconnecting the first and second bearing portions. Shoes are slidably arranged between the swash plate and the first and second bearing portions for converting rotational movement of the swash plate into reciprocal movement of the pistons. An oil communication hole is arranged in and extends through the second bearing portion for fluid communication between the groove of the second bearing portion on the side remote from the cylinder bore and the crank chamber.Type: GrantFiled: March 25, 1997Date of Patent: July 28, 1998Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Hiroaki Kayukawa, Suguru Hirota, Hideki Mizutani, Fuminobu Enokijima, Takehito Tomita, Yoshitami Kondo, Takahiro Hamaoka, Kenji Takenaka
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Patent number: 5556260Abstract: A multiple-cylinder piston type compressor is disclosed. The compressor has a cylinder head fastened to the rear end of a cylinder block assembly of the compressor with a valve plate interposed therebetween and having formed therein a suction chamber formed in a radially outer peripheral region thereof so as to surround a central discharge chamber. The compressor further includes a refrigerant gas intake passage extending along a straight line and radially through the axial center of the compressor and having at least two holes for providing direct communication between the gas intake passage and the suction chamber at positions that are radially spaced. The refrigerant gas intake passage may include a combination of at least two passage portions having different cross-sectional areas.Type: GrantFiled: April 28, 1994Date of Patent: September 17, 1996Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kenji Takenaka, Hiroaki Kayukawa, Masafumi Ito, Osamu Hiramatsu, Suguru Hirota, Taro Ozeki
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Patent number: 5486098Abstract: A swash plate type variable displacement compressor comprises cylinder bores, pistons, a suction chamber and a discharge chamber. A suction valve introduces a low pressure gas into a working chamber in each cylinder bore. A discharge valve introduces a high pressure gas in the working chamber into the discharge chamber during a compression stroke. A crank chamber communicates to each of the cylinder bores at rear sides of the pistons. A swash plate is tiltably supported on a drive shaft and connected to each of the pistons through associated rods. The swash plate makes the pistons reciprocate in response to its undulating swing motion and varies its inclination angle based upon pressure differential between pressure in the suction chamber and pressure in the crank chamber therefore adjusting discharge displacement.Type: GrantFiled: December 23, 1993Date of Patent: January 23, 1996Assignee: Kabushiki Kaisha Toyoda Jidoshokki SeisakushoInventors: Kazuya Kimura, Masafumi Ito, Hideki Mizutani, Yoshihiro Makino, Suguru Hirota, Taro Ozeki, Keiichi Kato, Hiroaki Kayukawa