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公开(公告)号：US20200378335A1
公开(公告)日：2020-12-03
申请号：US16618325
申请日：2018-05-31
Applicant: MAZDA MOTOR CORPORATION
Inventor： Satoshi IMAMURA , Masaki FUKUMA , Yasushi NAKAHARA , Atsushi INOUE , Kota MATSUMOTO , Yoshiharu UEKI , Michiharu KAWANO , Yuya HONDA , Kento ONISHI
Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a cylinder wall surface, a combustion chamber ceiling surface, and an ignition plug which includes an ignition portion. The crown surface of the piston includes: a cavity recessed in the cylinder axis direction; a parallel surface portion which is in parallel to a corresponding region on the combustion chamber ceiling surface at a position above the cylinder axis direction with a gap, when the piston is at a compression top dead center; and an inclined surface portion formed to continue to the parallel surface portion in such a way as to be directed to the ignition plug, when the piston is at a compression top dead center. The parallel surface portion and the corresponding region, in combination, constitute a squish flow generation portion generating a squish flow when the piston is lifted.
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公开(公告)号：US20200378334A1
公开(公告)日：2020-12-03
申请号：US16618321
申请日：2018-05-31
Applicant: MAZDA MOTOR CORPORATION
Inventor： Satoshi IMAMURA , Masaki FUKUMA , Yasushi NAKAHARA , Atsushi INOUE , Kota MATSUMOTO , Yoshiharu UEKI , Michiharu KAWANO , Yuya HONDA , Kento ONISHI
Abstract: A structure of a combustion chamber for an engine includes: a crown surface of a piston; a combustion chamber ceiling surface formed on a cylinder head; and an ignition plug mounted on the combustion chamber ceiling surface, and including an ignition portion disposed in such a way as to face the combustion chamber. The crown surface of the piston includes a cavity which is recessed in a cylinder axis direction in a region including a position below the ignition portion of the ignition plug in a plan view from the cylinder axis direction. A rim portion of the cavity includes a guide portion, raised in the cylinder axis direction with respect to an inner region of the rim portion, interposing the ignition portion when the piston is at a compression top dead center, and configured to guide an air-fuel mixture within the combustion chamber to the ignition portion.
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Patent Agency Ranking
公开(公告)号：US20190383208A1
公开(公告)日：2019-12-19
申请号：US16478881
申请日：2017-03-03
Applicant: MAZDA MOTOR CORPORATION
Inventor： Yasushi NAKAHARA , Yohei SUZUKI , Tsuyoshi YAMAMOTO , Michiharu KAWANO , Yuya HONDA , Kento ONISHI
Abstract: In an engine (1), an ignition plug (22) is arranged between a first intake port (6) and a second intake port (7). In a case where a downstream end portion (71) of the second intake port (7) is divided into a first intake port (6) side and an opposite first intake port (6) side, an inner wall surface (71a) of an opposite first intake port (6) side portion extends in a direction toward the first intake port (6) as extending from an upstream side to a downstream side of the second intake port (7).
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公开(公告)号：US20200166003A1
公开(公告)日：2020-05-28
申请号：US16618074
申请日：2018-05-22
Applicant: MAZDA MOTOR CORPORATION
Inventor： Satoshi IMAMURA , Masaki FUKUMA , Yasushi NAKAHARA , Atsushi INOUE , Kota MATSUMOTO , Yoshiharu UEKI , Michiharu KAWANO , Yuya HONDA , Kento ONISHI
Abstract: A structure of a combustion chamber for an engine includes a crown surface of a piston, a combustion chamber ceiling surface, an injector and an ignition plug provided on the combustion chamber ceiling surface, and an intake opening and an exhaust opening opened in the combustion chamber ceiling surface. A side where the intake opening is opened is defined as an intake port side, and a side where the exhaust opening is opened is defined as an exhaust port side. An ignition portion of the ignition plug is disposed on the intake port side. The ignition plug is ignited at a timing after the piston passes a compression top dead center. The injector is disposed on the center portion, and is configured to inject fuel toward the exhaust port side. A cavity is provided on the crown surface. A reverse squish flow generation portion is provided in the combustion chamber.
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公开(公告)号：US20200158007A1
公开(公告)日：2020-05-21
申请号：US16678305
申请日：2019-11-08
Applicant: Mazda Motor Corporation
Inventor： Satoshi IMAMURA , Masaki FUKUMA , Yasushi NAKAHARA , Atsushi INOUE , Kota MATSUMOTO , Michiharu KAWANO , Yuya HONDA , Futa NISHI
IPC: F02B23/06
Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape; a pair of first raised portions having a mound-shape along a pent roof shape; and a second raised portion provided to protrude at a position orthogonal to a ridge extending direction of the pair of first raised portions. With a height of the first raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a height of the second raised portion being represented as H2, H1/H2 as a ratio of the height H1 of the first raised portion to the height H2 of the second raised portion is set to be in a range of 1.92 or more and 2.75 or less.
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公开(公告)号：US20200158006A1
公开(公告)日：2020-05-21
申请号：US16676746
申请日：2019-11-07
Applicant: Mazda Motor Corporation
Inventor： Satoshi IMAMURA , Masaki FUKUMA , Yasushi NAKAHARA , Atsushi INOUE , Kota MATSUMOTO , Michiharu KAWANO , Yuya HONDA , Futa NISHI
IPC: F02B23/06
Abstract: A combustion chamber structure for an engine includes a combustion chamber where SI combustion by spark ignition and CI combustion by self-ignition are conducted. A crown surface includes a cavity recessed to have a bowl-shape, and a pair of raised portions. The cavity includes a bottom portion which is a lower region of the recessed part, the bottom portion having an outer circumferential edge which is circular in a top view. With a height of the raised portion relative to a height position of a deepest portion of the cavity being represented as H1 and a diameter of an outer circumferential edge of the bottom portion of the cavity being represented as D, H1/D as a ratio of the height H1 of the raised portion to the diameter D of the cavity is set to be in a range of 0.05 or more and 0.36 or less.
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公开(公告)号：US20190383207A1
公开(公告)日：2019-12-19
申请号：US16478880
申请日：2017-03-03
Applicant: MAZDA MOTOR CORPORATION
Inventor： Yasushi NAKAHARA , Yohei SUZUKI , Tsuyoshi YAMAMOTO , Michiharu KAWANO , Yuya HONDA , Kento ONISHI
Abstract: In an engine (1), when an intake valve (16) opens, a downstream end portion (61) of a first intake port (6) extends to direct to between a shade back (162a) positioned on a cylinder axis (C) side with respect to a valve stem (161) and a ceiling surface (51) facing the shade back (162a). As viewed in a section perpendicular to a direction perpendicular to an intake air flow direction, a second intake port side inner wall surface (61a) at the downstream end portion (61) of the first intake port (6) curves apart from a second intake port (7) in a direction from an exhaust side to an intake side as compared to the shape of an opposite second intake port side inner wall surface (61b) mirror-reversed to a second intake port (7) side.
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