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公开(公告)号：US12027826B2
公开(公告)日：2024-07-02
申请号：US17972519
申请日：2022-10-24
发明人： Shuwei Ma
摘要： A spark plug having a firing pad with minimal silicon diffusion and limited silicon oxidation at grain boundaries that can cause undesirable vertical cracking. In one embodiment, the firing pad has a multilayer structure having a base layer and a firing layer, wherein the base layer is a non-precious metal based material having silicon, and wherein the firing layer is a precious metal based material having yttrium in an amount of 0.1 to 0.5 wt %, inclusive. After at least 190 hours of isothermal treatment of at least 1000° C., an extent of vertical cracking from the sparking surface does not exceed 50% of a thickness of the firing pad or the firing layer.
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公开(公告)号：US20220077661A1
公开(公告)日：2022-03-10
申请号：US17413239
申请日：2020-04-27
发明人： Shunsuke TSUGA , Keiji OZEKI
摘要： The spark plug includes a cylindrical insulator, a center electrode provided in the insulator, and a cylindrical metal shell provided around the insulator. A ledge portion of the metal shell has a frontward facing surface facing a front side, a rearward facing surface facing a rear side, and a connection surface connecting the rearward facing surface and the frontward facing surface. The rearward facing surface engages with a step portion of the insulator. The metal shell includes a front cylindrical portion connected to the front side of the ledge portion. The inner circumferential surface of the front cylindrical portion is connected to the frontward facing surface of the ledge portion via a chamfered surface or a rounded surface. A corner at which the connection surface and the frontward facing surface are connected is located on the front side with respect to a front end of the insulator.
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公开(公告)号：US20220077660A1
公开(公告)日：2022-03-10
申请号：US17415668
申请日：2018-12-20
摘要： A spark plug assembly includes a spark plug, where the spark plug includes a high voltage connector, an insulator body, a metallic shell, and an electrical conductor at least partly disposed in the insulator body and the metallic shell. The spark plug assembly includes a detection unit having a transmitter device and a receiver device. The transmitter device is coupled to the spark plug and is electrically disposed between the high voltage connector and the electrical conductor. Further, the transmitter device is configured to draw an excitation current from the electrical conductor. The transmitter device includes an optical signal generator that is configured to generate an optical signal in response to the drawn excitation current. The receiver device is disposed in optical communication with the transmitter device and configured to receive the optical signal from the transmitter device.
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公开(公告)号：US11002219B1
公开(公告)日：2021-05-11
申请号：US16865532
申请日：2020-05-04
申请人： Caterpillar Inc.
发明人： James Jay Cress
摘要： A spark plug includes a body of revolution defining a longitudinal axis. The body has a forward axial portion with external threads, and an intermediate axial collar portion defining an axially downwardly facing sealing surface. A first electrode and a second electrode extend from the forward axial portion and define a spark gap therebetween. A hex drive portion is disposed axially above the intermediate collar portion. A gasket crush limiter includes a wall that extends axially downwardly from the intermediate axial collar portion, defining an annular pocket formed by the wall and the forward axial portion.
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公开(公告)号：US10886707B2
公开(公告)日：2021-01-05
申请号：US16850249
申请日：2020-04-16
申请人： DENSO CORPORATION
发明人： Kosuke Hayashi
IPC分类号： H01T13/20
摘要： A spark plug has a housing of a cylindrical shape and an insulator of a cylindrical shape supported inside the housing. A position of an insulator distal end at a distal end of the insulator is arranged equal to or forward of a position of a distal end of the housing in an axial direction of the spark plug. The spark plug satisfies a relationship designated by an equation, −0.064L2+0.26E+0.53≤T≤0.07L2−0.35L+1.36, where T indicates a thickness of the insulator distal end of the insulator, and L indicates an insulator projection length measured from the position of the distal end of the housing to the position at the insulator distal end surface of the insulator.
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公开(公告)号：US10790639B1
公开(公告)日：2020-09-29
申请号：US16834008
申请日：2020-03-30
发明人： Susumu Imai
摘要： A spark plug includes a tubular metallic shell having an attachment screw portion having an external thread. The attachment screw portion has a pitch diameter maximum portion at which the external thread has a maximum pitch diameter, the pitch diameter maximum portion being located on a rear end side of a center of the attachment screw portion in a direction along an axial line of the metallic shell, and a pitch diameter local maximum portion at which the external thread has a locally maximum pitch diameter, the pitch diameter local maximum portion being located on a forward end side of the pitch diameter maximum portion in the direction along the axial line.
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公开(公告)号：US10605222B2
公开(公告)日：2020-03-31
申请号：US16077271
申请日：2016-03-31
发明人： Cherian A. Idicheria , Paul M. Najt
IPC分类号： F02P9/00 , F02D41/00 , F02P5/04 , H01T13/50 , F02P15/08 , F02D37/02 , F02M26/01 , H01T13/20 , F02D41/40 , F02P23/04 , F02P5/00 , F02P21/00 , H05H1/24 , F02B75/12 , F02D13/02 , F02D41/38
摘要： An internal combustion engine includes a fuel nozzle for injecting a fuel into a combustion chamber, and a plasma igniter for generating one or more pluralities of free radicals within the chamber, and initiating a flame to ignite the fuel. The igniter protrudes into the chamber. A method of igniting a fuel within a combustion chamber and controlling combustion phasing includes injecting a first portion of the fuel into the combustion chamber, energizing the plasma igniter to generate one or more pluralities of free radicals, each plurality having a known voltage, subsequently injecting a second portion of the fuel into the combustion chamber, and closely coupling activation of the plasma igniter with the second injection to ignite the fuel. Combustion phasing of the ignition event is controlled by controlling the number and voltage of the pluralities of free radicals generated by the plasma igniter.
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公开(公告)号：US20200099198A1
公开(公告)日：2020-03-26
申请号：US16582430
申请日：2019-09-25
申请人： DENSO CORPORATION
发明人： Yuuki KAWATA , Fumiaki AOKI , Daisuke TANAKA , Ryota WAKASUGI , Kanechiyo TERADA , Tetsuya MIWA , Akimitsu SUGIURA
摘要： In a spark plug for an internal combustion engine, a discharge gap is formed between a central electrode and a ground electrode in an axial direction of the spark plug. An insulator of a cylindrical shape has an axial hole and an insulator front end part. The axial hole is formed in the insulator, into which the central electrode is arranged and supported. The insulator front end part projects further toward a front side of the insulator in the axial direction of the spark plug than a location of an opening part formed at a front end side of the axial hole. The discharge gasp is formed in an auxiliary combustion chamber. The outer peripheral side of the auxiliary combustion chamber is covered with the insulator front end part.
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公开(公告)号：US10559944B2
公开(公告)日：2020-02-11
申请号：US16088954
申请日：2017-03-17
申请人： DENSO CORPORATION
发明人： Yuji Kaji , Koji Yamanaka
IPC分类号： H01T13/20
摘要： A spark plug for an internal combustion engine that can improve bonding strength between a center electrode and a conductive glass is provided. The spark plug includes a housing, an insulator, a center electrode, a ground electrode, and a conductive glass. The center electrode has a locking portion that is locked from a base end side to a step portion formed on an inner peripheral surface of the insulator, and an electrode head that is closer to the base end side than the locking portion is. A concave portion is partially formed on the tip end surface of the electrode head. A concave contour, which is an outer peripheral contour of the concave portion when viewed in a plug axial direction, forms a closed curve which is spaced apart from a head contour, which is an outer peripheral contour of the base end surface of the electrode head, and surrounds a center axis (B) of the center electrode. The concave contour has an outward portion protruding toward the head contour and an inward portion protruding toward the center axis (B) of the center electrode.
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公开(公告)号：US10468858B2
公开(公告)日：2019-11-05
申请号：US15637704
申请日：2017-06-29
摘要： Described is a supply circuit for a corona ignition device, with an input for connection to a direct voltage source, a first converter, a second converter, and an output for connecting a load. The two converters each generate an output voltage, which is provided on its secondary side and exceeds the input voltage. The two converters each contain a transformer that galvanically separates the primary side of the converter from its secondary side. At least one transistor switch is arranged between the input and primary side of the two converters for pulse width-modulation of the input voltage. The primary side of the second converter is connected in parallel with the primary side of the first converter, the secondary side of the second converter is connected in series with the secondary side of the first converter, the secondary sides of the two converters are each bridged in this series connection by at least one diode, so that an output voltage can be provided at the output of the supply circuit even given a failure of one of the two converters.
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