Patents by Inventor Hiroaki MURANAKA
Hiroaki MURANAKA 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: 20210148303Abstract: A cooling structure of an engine comprises a cylinder block provided with a wall surface partitioning a water jacket provided to surround a cylinder line and allow cooling water to flow therein and a water-jacket spacer arranged inside the water jacket and provided to regulate flowing of the cooling water. The water-jacket spacer comprises a spacer body having a shape along an outer-peripheral shape of the cylinder line and includes an internal surface facing cylinders, and an expansive member expandable according to an external factor is provided at the internal surface of the spacer body such that the expansive member extends continuously over a range from an one-end side to the other-end side of the cylinder line at a lower part, in a cylinder-axis direction, of the internal surface of the spacer body.Type: ApplicationFiled: September 3, 2020Publication date: May 20, 2021Applicant: MAZDA MOTOR CORPORATIONInventors: Daisuke MATSUMOTO, Hiroaki MURANAKA, Daisuke TABATA, Masaki TAKAHARA
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Patent number: 10968817Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug, the intake-side inclined surface and the exhaust-side inclined surface are formed in such a way that an inclination angle of the exhaust-side inclined surface is smaller than an inclination angle of the intake-side inclined surface, and a difference in inclination angle between the intake-side inclined surface and the exhaust-side inclined surface is 4 degrees or larger.Type: GrantFiled: February 27, 2018Date of Patent: April 6, 2021Assignee: Mazda Motor CorporationInventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Patent number: 10968816Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug. The cavity includes a bottom surface and a tubular peripheral surface, and is formed in such a way that a ratio of a depth of the cavity with respect to a diameter of the cavity is 0.3 or smaller.Type: GrantFiled: February 27, 2018Date of Patent: April 6, 2021Assignee: Mazda Motor CorporationInventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Patent number: 10907533Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug, the intake-side inclined surface and the exhaust-side inclined surface are formed in such a way that a ratio of a length of the exhaust-side inclined surface with respect to a length of the intake-side inclined surface is 1.25 or larger in a cross section passing through a center axis of the piston and orthogonal to an axis direction of a crankshaft.Type: GrantFiled: February 27, 2018Date of Patent: February 2, 2021Assignee: Mazda Motor CorporationInventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Publication number: 20200131978Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug, the intake-side inclined surface and the exhaust-side inclined surface are formed in such a way that an inclination angle of the exhaust-side inclined surface is smaller than an inclination angle of the intake-side inclined surface, and a difference in inclination angle between the intake-side inclined surface and the exhaust-side inclined surface is 4 degrees or larger.Type: ApplicationFiled: February 27, 2018Publication date: April 30, 2020Inventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Patent number: 10612448Abstract: A cooling structure of a multi-cylinder engine is provided, which includes cylinder bores formed in a cylinder block, a water jacket surrounding the bores, a cylinder head, and a water jacket spacer accommodated in the water jacket and having a peripheral wall formed corresponding to the cylinder bores. A length of the peripheral wall in cylinder bore axial directions is substantially the same as that of the water jacket. The peripheral wall forms, inside the water jacket, inner and outer channels, and a width of the inner channel is less than that of the outer channel. Communicating holes communicating the inner and outer channels are formed in the peripheral wall at locations between adjacent cylinder bores, respectively. Inter-bore channels into which some cooling fluid flowing from the outer channel into the inner channel flows are provided to parts of the cylinder block between the adjacent cylinder bores, respectively.Type: GrantFiled: September 12, 2018Date of Patent: April 7, 2020Assignee: Mazda Motor CorporationInventors: Daisuke Tabata, Hiroaki Muranaka, Daisuke Matsumoto, Masaki Takahara
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Publication number: 20200040807Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug, the intake-side inclined surface and the exhaust-side inclined surface are formed in such a way that a ratio of a length of the exhaust-side inclined surface with respect to a length of the intake-side inclined surface is 1.25 or larger in a cross section passing through a center axis of the piston and orthogonal to an axis direction of a crankshaft.Type: ApplicationFiled: February 27, 2018Publication date: February 6, 2020Inventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Publication number: 20200018225Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug, the intake-side inclined surface and the exhaust-side inclined surface are formed in such a way that an angle defined by an orthogonal plane orthogonal to a center axis of a cylinder and the exhaust-side inclined surface) is smaller than an angle defined by the orthogonal plane and a valve head bottom surface of an exhaust valve, and an inclination angle difference between the exhaust-side inclined surface and the valve head bottom surface of the exhaust valve is larger than an inclination angle difference between the intake-side inclined surface and a valve head bottom surface of an intake valve by 3 degrees or larger.Type: ApplicationFiled: February 27, 2018Publication date: January 16, 2020Inventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Publication number: 20200018224Abstract: In a spark-ignition internal combustion engine in which a protrusion including an intake-side inclined surface and an exhaust-side inclined surface is formed on a top surface of a piston, and a cavity is formed in the protrusion at a position associated with a spark plug. The cavity includes a bottom surface and a tubular peripheral surface, and is formed in such a way that a ratio of a depth of the cavity with respect to a diameter of the cavity is 0.3 or smaller.Type: ApplicationFiled: February 27, 2018Publication date: January 16, 2020Inventors: Shuma Aoki, Hiroaki Muranaka, Naohiro Yamaguchi, Yoshitaka Wada
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Publication number: 20190112963Abstract: A cooling structure of a multi-cylinder engine is provided, which includes cylinder bores formed in a cylinder block, a water jacket surrounding the bores, a cylinder head, and a water jacket spacer accommodated in the water jacket and having a peripheral wall formed corresponding to the cylinder bores. A length of the peripheral wall in cylinder bore axial directions is substantially the same as that of the water jacket. The peripheral wall forms, inside the water jacket, inner and outer channels, and a width of the inner channel is less than that of the outer channel. Communicating holes communicating the inner and outer channels are formed in the peripheral wall at locations between adjacent cylinder bores, respectively. Inter-bore channels into which some cooling fluid flowing from the outer channel into the inner channel flows are provided to parts of the cylinder block between the adjacent cylinder bores, respectively.Type: ApplicationFiled: September 12, 2018Publication date: April 18, 2019Inventors: Daisuke Tabata, Hiroaki Muranaka, Daisuke Matsumoto, Masaki Takahara
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Patent number: 9964009Abstract: An oil supply system for an engine is provided, which includes an oil pressure controller for controlling a variable displacement oil pump to adjust a discharge pressure thereof to reach a target oil pressure corresponding to an operating state of the engine, the variable displacement oil pump capable of adjusting a discharge amount of oil, a load detector for detecting an engine load, and an oil temperature detector for detecting an oil temperature. When the engine load is low, to increase an amount of oil mist flowing inside a crank case of the engine, the oil pressure controller controls the variable displacement oil pump to increase the discharge amount as the oil temperature becomes lower, the oil mist generated by the oil flowing out of a bearing part rotatably supporting at least a crankshaft and being atomized, the engine load being considered low when below a predetermined reference load.Type: GrantFiled: June 6, 2016Date of Patent: May 8, 2018Assignee: Mazda Motor CorporationInventors: Masanori Hashimoto, Hisashi Okazawa, Hiroaki Muranaka, Kimio Ishida, Hiroshi Hosokawa, Sho Ishigaki
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Patent number: 9791045Abstract: An oil ring to be attached to a ring groove of a piston for an engine is provided. The oil ring includes two annular ring bodies having a common axis and arranged in tandem, and an expander for biasing the ring bodies radially outward. A sliding surface is formed at an outer circumference of each ring body to bulge radially outward and slides on a cylinder inner circumferential surface. The sliding surface of one of the ring bodies has a tip portion and first and second curved surfaces. In cross sections of the first and second curved surfaces, the first and second curved surfaces are connected while tangent lines to the cross sections at the tip portion align with each other, and when positional change rates are compared between points on the first and second curved surfaces, a change rate of the first curved surface is lower.Type: GrantFiled: August 13, 2015Date of Patent: October 17, 2017Assignee: Mazda Motor CorporationInventors: Masaki Fukuma, Hiroaki Muranaka, Shuma Aoki, Shuji Takuma
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Publication number: 20160356188Abstract: An oil supply system for an engine is provided, which includes an oil pressure controller for controlling a variable displacement oil pump to adjust a discharge pressure thereof to reach a target oil pressure corresponding to an operating state of the engine, the variable displacement oil pump capable of adjusting a discharge amount of oil, a load detector for detecting an engine load, and an oil temperature detector for detecting an oil temperature. When the engine load is low, to increase an amount of oil mist flowing inside a crank case of the engine, the oil pressure controller controls the variable displacement oil pump to increase the discharge amount as the oil temperature becomes lower, the oil mist generated by the oil flowing out of a bearing part rotatably supporting at least a crankshaft and being atomized, the engine load being considered low when below a predetermined reference load.Type: ApplicationFiled: June 6, 2016Publication date: December 8, 2016Inventors: Masanori Hashimoto, Hisashi Okazawa, Hiroaki Muranaka, Kimio Ishida, Hiroshi Hosokawa, Sho Ishigaki
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Publication number: 20160076649Abstract: An oil ring to be attached to a ring groove of a piston for an engine is provided. The oil ring includes two annular ring bodies having a common axis and arranged in tandem, and an expander for biasing the ring bodies radially outward. A sliding surface is formed at an outer circumference of each ring body to bulge radially outward and slides on a cylinder inner circumferential surface. The sliding surface of one of the ring bodies has a tip portion and first and second curved surfaces. In cross sections of the first and second curved surfaces, the first and second curved surfaces are connected while tangent lines to the cross sections at the tip portion align with each other, and when positional change rates are compared between points on the first and second curved surfaces, a change rate of the first curved surface is lower.Type: ApplicationFiled: August 13, 2015Publication date: March 17, 2016Inventors: Masaki Fukuma, Hiroaki Muranaka, Shuma Aoki, Shuji Takuma
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Patent number: 9010296Abstract: The present invention provides a piston for a spark-ignition engine, comprising: a land part 18, an upper surface part of which has a crown part 26 forming a combustion chamber; a pair of skirt parts 20 extending downward from a peripheral part of the land part 18 and facing each other in a radial direction thereof; a pair of sidewall parts 19 coupling side end parts of the pair of skirt parts 20 to each other; and a pin boss part 21 that is formed in each of the sidewall parts 19. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ring 30 fitted into a top ring groove 24a on an outer circumferential surface of the land part 18. The crown part 26 is configured by a flat base surface 27 and a bulging part 15 bulging upward above the base surface 27, and a thinned part 40 provided in the land part 18 is formed deep such that the deepest part thereof is positioned inside the bulging part 15.Type: GrantFiled: June 10, 2011Date of Patent: April 21, 2015Assignees: Kolbenschmidt K. K., Mazda Motor CorporationInventors: Kazuyuki Teshima, Yoshikazu Nishiyama, Hiroyuki Takeshige, Hiroaki Muranaka
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Patent number: 8854665Abstract: An information processing system includes following elements. A first management device manages, for each user, information on a function of a printer that the user is permitted to use therein. A second management device accepts registration of a virtual printer for a set of a printer and a function used in the printer, and manages the registered virtual printer. A registration device registers a virtual printer in the second management device. The registration device identifies a user and a printer regarding a print request, acquires a function that the identified user is permitted to use in the identified printer from the first management device, and registers a virtual printer for a set of the identified printer and the acquired function in association with the identified user. The second management device processes, upon receiving a print instruction from the user, the print instruction based on the corresponding printer and function.Type: GrantFiled: February 1, 2012Date of Patent: October 7, 2014Assignee: Fuji Xerox Co., Ltd.Inventor: Hiroaki Muranaka
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Publication number: 20130092116Abstract: The present invention provides a piston for a spark-ignition engine, comprising: a land part 18, an upper surface part of which has a crown part 26 forming a combustion chamber; a pair of skirt parts 20 extending downward from a peripheral part of the land part 18 and facing each other in a radial direction thereof; a pair of sidewall parts 19 coupling side end parts of the pair of skirt parts 20 to each other; and a pin boss part 21 that is formed in each of the sidewall parts 19. The present invention can inhibit the generation of HC produced at the time of combustion, while thermally protecting a top ring 30 fitted into a top ring groove 24a on an outer circumferential surface of the land part 18. The crown part 26 is configured by a flat base surface 27 and a bulging part 15 bulging upward above the base surface 27, and a thinned part 40 provided in the land part 18 is formed deep such that the deepest part thereof is positioned inside the bulging part 15.Type: ApplicationFiled: June 10, 2011Publication date: April 18, 2013Applicants: MAZDA MOTOR CORPORATION, KOLBENSCHMIDT K.K.Inventors: Kazuyuki Teshima, Yoshikazu Nishiyama, Hiroyuki Takeshige, Hiroaki Muranaka
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Publication number: 20130070288Abstract: An information processing system includes following elements. A first management device manages, for each user, information on a function of a printer that the user is permitted to use therein. A second management device accepts registration of a virtual printer for a set of a printer and a function used in the printer, and manages the registered virtual printer. A registration device registers a virtual printer in the second management device. The registration device identifies a user and a printer regarding a print request, acquires a function that the identified user is permitted to use in the identified printer from the first management device, and registers a virtual printer for a set of the identified printer and the acquired function in association with the identified user. The second management device processes, upon receiving a print instruction from the user, the print instruction based on the corresponding printer and function.Type: ApplicationFiled: February 1, 2012Publication date: March 21, 2013Applicant: FUJI XEROX CO., LTD.Inventor: Hiroaki MURANAKA