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公开(公告)号：US12095235B2
公开(公告)日：2024-09-17
申请号：US18567558
申请日：2022-06-14
申请人： NITERRA CO., LTD.
发明人： Shoma Tsumagari , Haruki Yoshida , Hiroki Shimada , Tomoya Kukino , Takuto Koba , Noriyuki Tamura
IPC分类号： H01T13/38
CPC分类号： H01T13/38
摘要： In a spark plug 1 of the present invention, in a mirror-polished surface 230a obtained by mirror-polishing a cut surface 230 obtained by cutting an insulator 2 in a direction perpendicular to an axial line AX direction, at a position separated by 2 mm from a portion having a maximum diameter of a diameter-enlarged portion 31a to a rear end side along the axial line AX direction, when 20 first observation regions X each being 192 μm×255 μm are set so as to each overlap a reference position m1 being a position 0.2 mm in a radial direction from an inner peripheral surface 2a side of the insulator 2 and so as not to overlap each other, a proportion (porosity) of an area of all of pores included in the 20 first observation regions X relative to a total area (100%) of the 20 first observation regions X is not greater than 3.5%, and in a thermally etched surface 230b obtained by subjecting the mirror-polished surface 230a to thermal etching, when 20 second observation regions Y each being 32 μm×43 μm are set so as to each overlap the reference position m1 and so as not to overlap each other, a particle size distribution of alumina particles included in the 20 second observation regions Y is regarded as a normal distribution, an average particle diameter of the alumina particles is defined as A, and a standard deviation of a particle diameter of the alumina particles is defined as σ, A is not less than 1.9 μm and not greater than 2.8 μm, and (A+3σ) is not greater than 3.0 μm.
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公开(公告)号：US11942764B1
公开(公告)日：2024-03-26
申请号：US18332260
申请日：2023-06-09
发明人： Michael Czekala , Thomas G. Leone
摘要： System and methods for operating a vehicle that includes a boosted engine are described. In one example, a spark plug may be adjusted between two operating states to reduce a possibility of pre-ignition and spark plug fouling. A first operating state may be conducive to operating the engine at light loads. The first operating state may be conducive to operating the engine at higher loads.
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3.发明授权公开(公告)号：US11923663B2
公开(公告)日：2024-03-05
申请号：US17382376
申请日：2021-07-22
发明人： Ming Zheng , Guangyun Chen , Xiao Yu , Tangliang Zhang , Jin Qian , Hua Zhu
摘要： In the spark plug heat rating measurement method and system based on spark discharge current active heating, the spark plug is installed in a constant-temperature water jacket cooling chamber with a specific torque. A constant spark discharge current control module is connected to the high-voltage terminal of the spark plug, to provide real-time controlled discharge current to heat up the high-voltage central electrode of the spark plug. During the spark discharge process, the temperature change of the high-voltage central electrode and the surrounding ceramic insulator are measured by a temperature detection module and used to determine the heat rating of the spark plug. By real time adjusting the discharge current level of the spark plug, or providing a same amount of spark energy to the spark gap, the heat ratings of spark plugs with different ceramic insulation structures can be evaluated through the temperature changes during discharge or after discharge.
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公开(公告)号：US11695256B2
公开(公告)日：2023-07-04
申请号：US17970092
申请日：2022-10-20
申请人： DENSO CORPORATION
发明人： Akimitsu Sugiura
摘要： A spark plug for an internal combustion engine includes insulating glass having a tubular shape, a central electrode including a tip protruding portion, a housing having a tubular shape, and a plug cover provided over an auxiliary combustion chamber. The plug cover is provided with injection holes through which the auxiliary combustion chamber communicates with the exterior. The central electrode includes a base material and a core material disposed inside the base material and having a higher thermal conductivity than the base material. The core material includes a large diameter portion and a small diameter portion continuously formed on a tip side of the large diameter portion. The small diameter portion has a smaller diameter than the large diameter portion, and includes, in a part of the small diameter portion in an axial direction, a small-diameter columnar portion having a constant diameter. At least a part of the small-diameter columnar portion is disposed further on the tip side of the spark plug than a tip of the insulating glass.
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公开(公告)号：US11581708B2
公开(公告)日：2023-02-14
申请号：US17396149
申请日：2021-08-06
申请人： EcoPower Spark, LLC
发明人： David Resnick
摘要： One example provides a spark plug including an axial centerline extending between a terminal end and a firing end, an insulative core including a central bore having a first diameter coincident with the axial centerline extending through the insulative core, an insulative nose proximate to the firing end, and a counter bore coincident with the axial centerline and extending axially into the insulative nose, the counter bore having a second diameter greater than the first diameter. A center electrode includes an electrode wire disposed within the central bore and having a first end extending into the counter bore, and an electrode head mechanically and electrically coupled to the first end of the electrode wire, a first portion of the electrode head seated within the counter bore to define an interface with the counter bore to provide a heat transfer path from the electrode head to the insulative core.
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公开(公告)号：US20210305787A1
公开(公告)日：2021-09-30
申请号：US17261425
申请日：2019-07-26
发明人： Andreas Gruber , Martin Fuchs , Gunnar Armbrecht
摘要： An apparatus for igniting a fuel mixture provides an ignition system for generating a high-voltage ignition voltage, a circuit device comprising a circuit for superimposing a high-frequency signal on to the high-voltage ignition voltage, a spark plug in an engine block, and a transmission element having a high-voltage conductor which is guided in an insulation element. The high-voltage conductor is used for transmitting the ignition voltage, onto which the high-frequency signal has been superimposed, to the spark plug. Further provided is an electrically conducting shielding element which surrounds the high-voltage conductor in an electromagnetically shielding manner at least along one portion of the longitudinal axis of the high-voltage conductor. The shielding element is connected in an electrically conducting manner to a ground potential of the circuit device and establishes a connection between the ground potential of the circuit device and a ground electrode of the spark plug.
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公开(公告)号：US10581226B2
公开(公告)日：2020-03-03
申请号：US15882368
申请日：2018-01-29
发明人： Kohei Usami , Yuichi Yamada
摘要： A spark plug includes: a center electrode; an insulator having a through hole around a part of the center electrode; and a metal shell holding the insulator from an outer peripheral side thereof. The metal shell includes a shelf portion that projects radially inward. The insulator includes an engagement portion engaged with the shelf portion from the front side, and a front end portion at the front side with respect to a front end of the metal shell. The front end portion has an outer diameter larger than an inner diameter of the metal shell at the front side with respect to the shelf portion. The front end portion of the insulator has a diameter-enlarged portion at which a diameter of the through hole increases and which is spaced apart from an outer peripheral surface of the center electrode.
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公开(公告)号：US10348061B2
公开(公告)日：2019-07-09
申请号：US16018949
申请日：2018-06-26
IPC分类号： H01T13/38 , H01T13/60 , B82Y30/00 , C04B35/64 , C04B35/111 , C04B35/117 , C04B35/626
摘要： The spark plug includes an insulator formed of an alumina-based sintered body, and the insulator contains Si, Ba, and a rare earth element. In an analysis of the insulator by using a scanning transmission electron microscope having an electron-probe diameter of 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, a content of an alkaline earth metal is less than a detection limit at the crystal grain boundary, and a diffraction spot is present in an electron diffraction pattern of a portion where Ba is detected.
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公开(公告)号：US20190181620A1
公开(公告)日：2019-06-13
申请号：US16214505
申请日：2018-12-10
申请人： DENSO CORPORATION
发明人： Yuji KAJI
摘要： A spark plug for internal combustion engines is provided which includes a porcelain insulator which is disposed inside a housing and extends outside a front end of the porcelain insulator. An annular ground electrode is secured to a front end portion of the housing. A pocket is created between a nose of the porcelain insulator and the housing. The housing has formed therein a plurality of vent holes which are located outside the ground electrode in a radial direction of the housing and communicate between the pocket and a combustion chamber of the engine. The vent holes include a first vent hole and a second vent hole which are different in opening area from each other, thereby enhancing scavenging of the pocket to ensure the stability of operation of the spark plug.
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公开(公告)号：US10270226B2
公开(公告)日：2019-04-23
申请号：US15605223
申请日：2017-05-25
摘要： An extruded insulator for a spark plug that is made in a manner that minimizes pores, relics and/or other defects in the insulator microstructure so that the overall dielectric strength or performance of the insulator is improved. The extruded insulator avoids many of the drawbacks associated with such defects, but also has a stepped internal bore for receiving a center electrode. In one embodiment, the extruded insulator is made with a method that uses a multi-phase extrusion process to extrude a ceramic paste around an elongated arbor and form an extruded section, and then removes the arbor from the extruded section to reveal a stepped internal bore.
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