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公开(公告)号：US12088067B2
公开(公告)日：2024-09-10
申请号：US18559762
申请日：2022-06-06
申请人： Niterra Co., Ltd.
发明人： Susumu Imai , Tatsuya Gozawa
IPC分类号： H01T13/08
CPC分类号： H01T13/08
摘要： A spark plug includes an insulator having an axial hole, a center electrode disposed in the axial hole and having a forward end portion projecting to a forward end of the axial hole, a tubular metallic shell which holds the insulator on its inner circumference and has a screw portion formed on its outer circumferential surface, and a ground electrode whose first end portion is fixed to a through hole provided in the metallic shell and whose second end portion forms a discharge gap between the second end portion and the forward end portion. The screw portion has a first screw portion located on a rear end of the through hole and a second screw portion located on a forward end of the through hole, and the first screw portion has a pitch diameter larger than that of the second screw portion.
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公开(公告)号：US12027825B1
公开(公告)日：2024-07-02
申请号：US18396425
申请日：2023-12-26
发明人： Stefan Prankl , Johann Klausner , Robert Grabner
摘要： Spark plug for igniting a combustible fuel in an internal combustion engine, wherein the spark plug has an igniter arranged at an end of the spark plug facing the combustion chamber, when the spark plug is mounted in the internal combustion engine. The spark plug includes a wall and a sealing area. The wall at least partially surrounds the igniter. The sealing area is used for sealing the combustion chamber against the environment. The wall has the sealing area located at an end of the wall, which end faces the combustion chamber when the spark plug is mounted in the internal combustion engine.
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公开(公告)号：US20240063609A1
公开(公告)日：2024-02-22
申请号：US18265869
申请日：2021-10-11
申请人： Niterra Co., Ltd.
发明人： Tatsuya GOZAWA , Ritsuka NAKAGAWA
CPC分类号： H01T13/32 , H01T13/08 , H01T13/467 , H01T13/54 , H01T13/34
摘要： Provided is a spark plug with which pre-ignition of fuel gas that has flowed into an auxiliary chamber can be reduced. The spark plug is provided with: an insulator (11); a central electrode (14) disposed in the insulator; a main metal fitting (20) in which a shelf portion (23) for locking the insulator is provided; a grounding electrode (30) between the central electrode and which a spark gap (32) is provided; and a cap (40) joined to the main metal fitting by way of a melted portion (41). The cap forms an auxiliary chamber (42), and includes an injection port (45) penetrating from an inner surface (43) to an outer surface (44). There is a gap (47) extending from the auxiliary chamber to the melted portion, between a first surface (26) connecting an inner peripheral surface of the main metal fitting and an outer peripheral surface of the main metal fitting on a tip end side of the shelf portion, and a second surface (46) of the cap, connecting an inner surface and an outer surface thereof, and the gap includes an opening portion (48) which opens into the auxiliary chamber in a radial direction.
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公开(公告)号：US20240055836A1
公开(公告)日：2024-02-15
申请号：US18268286
申请日：2021-12-15
发明人： Inigo GUISASOLA
IPC分类号： H01T13/08
CPC分类号： H01T13/08
摘要： The present invention pertains to a spark plug jacket, e.g. for a large or high performance combustion engine, and a corresponding method of manufacturing a spark plug jacket, in particular to provide an improved sealing towards a coolant cavity. Accordingly, a spark plug jacket is suggested, comprising a contact surface for contacting a support surface of a cylinder head of a combustion engine, wherein in a first state, when a spark plug is not mounted in the spark plug jacket, at least a portion of the contact surface of the spark plug jacket defines a first angular offset to a contact surface direction defined by the support surface of the cylinder head and, in a second state, when the spark plug is mounted to the spark plug jacket, said portion defines a second angular offset, wherein the first angular offset is larger than the second angular offset.
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公开(公告)号：US20230396041A1
公开(公告)日：2023-12-07
申请号：US18032804
申请日：2020-10-22
发明人： Stefan Prankl , Johann Klausner , Robert Grabner
摘要： A spark plug of an internal combustion engine has a sealing area between a mounting portion (e.g., threads) and an end portion of a housing of the spark plug. The end portion faces a combustion chamber of the internal combustion engine. The spark plug includes a flow control element coupled to the end portion, wherein the flow control element projects beyond an igniter in a direction toward the combustion chamber.
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公开(公告)号：US20180278027A1
公开(公告)日：2018-09-27
申请号：US15710899
申请日：2017-09-21
发明人： Yasuyuki SHIMIZU , Takaaki TANAKA , Akira NAKAGAWA
摘要： By grounding a metal first housing, radiation noise generated from the coupling circuit is shielded. Further, by enclosing the first housing in a metal second housing in a manner such that the first housing and the second housing do not come into contact with each other, and grounding the second housing by connecting the second housing to an engine block, radiation noise generated by the capacitive component between the coupling circuit and the first housing is shielded by the second housing. As a result, the influence of this noise on peripheral devices of the high frequency discharge ignition device can be suppressed.
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公开(公告)号：US09966736B2
公开(公告)日：2018-05-08
申请号：US15481569
申请日：2017-04-07
发明人： Daisuke Matsushita , Masahiro Inoue
摘要： A spark plug having a center electrode, a ground electrode, and a noble metal tip that is joined to a part of the ground electrode near one end of the ground electrode via a fused portion. The fused portion extends outward beyond an outer shape of the noble metal tip so that a part of the fused portion is present at each of positions that are located inward from and separated from both side edges of the ground electrode in a width direction of the ground electrode. The fused portion includes a fused protrusion that is located near at least one of two side edges of the noble metal tip in the width direction of the ground electrode and that protrudes in a direction away from the one end of the ground electrode.
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公开(公告)号：US09948067B2
公开(公告)日：2018-04-17
申请号：US15695232
申请日：2017-09-05
申请人： DENSO CORPORATION
发明人： Masamichi Shibata , Ryuichi Ohno , Kenji Hattori
摘要： A spark plug for an internal combustion engine includes a cylindrical metal shell, a center electrode, and a ground electrode. The center electrode has an end portion which protrudes outside an end of the metal shell. The ground electrode is joined at an end thereof to the metal shell and has an inner surface facing the end portion of the center electrode. The ground electrode has a maximum width W meeting a relation of 1.3≤W≤2.0. A distance d between the center of an end surface of the center electrode and the inner surface of the ground electrode on a plane extending through the center of the center electrode perpendicular to an axis of the spark plug is selected to meet a relation of W+0.525≤d≤1.07W+0.66. This ensures the stability of ignitability of the spark plug.
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公开(公告)号：US09923340B2
公开(公告)日：2018-03-20
申请号：US14805955
申请日：2015-07-22
发明人： Reiji Wakazono
摘要： A workpiece having a first portion and a second portion is held. The first portion extends in the direction of a center axis of the workpiece, and a male thread is to be rolled on the first portion. The length of the second portion in a direction perpendicular to the center axis is longer than that of the first portion. The male thread is formed on the outer circumference of the first portion using two rolling dies through rolling. At least a first portion center axis that is a part of the center axis and corresponds to the first portion is separated in a prescribed direction from a first virtual plane containing the center axes of the two rolling dies. In the workpiece held, the first portion center axis is inclined such that its distance from the first virtual plane increases with distance from the second portion.
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公开(公告)号：US09893495B2
公开(公告)日：2018-02-13
申请号：US15225216
申请日：2016-08-01
摘要： An electrically conductive glass seal for providing a hermetic bond between an electrically conductive component and an insulator of a spark plug is provided. The glass seal is formed by mixing glass frits, binder, expansion agent, and electrically conductive metal particles. The glass frits can include silica (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3), bismuth oxide (Bi2O3), and zinc oxide (ZnO); the binder can include sodium bentonite or magnesium aluminum silicate, polyethylene glycol (PEG), and dextrin; the expansion agent can include lithium carbonate; and the electrically conductive particles can include copper. The finished glass seal includes the glass in a total amount of 50.0 to 90.0 weight (wt. %), and electrically conductive metal particles in an amount of 10.0 to 50.0 wt. %, based on the total weight of the glass seal.
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