Spark Plugs Patents (Class 313/118)
  • Patent number: 10586627
    Abstract: The spark plug includes an insulator made from an alumina-based sintered body, and the insulator contains 90 to 98 wt % of an Al component in oxide equivalent. The insulator contains 1 to 5 wt % of an Si component, 0.1 to 1 wt % of an Mg component, 2 wt % or less of a Ca component, 0.3 to 6 wt % of a Ba component, and 0.11 to 5 wt % of a rare earth component, in oxide equivalent. In analysis using a scanning transmission electron microscope with a probe diameter of an electron beam set at 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, and an alkaline earth metal at the crystal grain boundary is less than a detection limit.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: March 10, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Haruki Yoshida, Kuniharu Tanaka, Shun Kondo, Yutaka Yokoyama, Yusuke Nomura, Michitaka Yamada
  • Patent number: 10490981
    Abstract: A spark plug for an internal combustion engine, having a center electrode, which has a first body and a second body that is a precious metal welded to the first body and a ground electrode arranged roundabout the center electrode so that an annular ignition gap is formed between the electrodes. The second body of the center electrode is formed as an annular element having a central recess. The first body of the center electrode has a projection that extends into the recess of the second body. A first weld seam is formed between a radially outer surface of the projection of the first body and a radially inner surface of the second body delimiting the recess of the second body, and a second weld seam is formed between an axial surface of the main body of the first body and an axial surface of the second body.
    Type: Grant
    Filed: May 2, 2019
    Date of Patent: November 26, 2019
    Assignee: MAN Energy Solutions SE
    Inventor: Björn Dirumdam
  • Patent number: 10447015
    Abstract: A method of producing a spark plug comprises (a) a step of combining a metallic shell and an insulator; (b) a step of inserting a portion of the assembly on its forward end side into a pressure container; (c) a step of bringing an insulating member into contact with the outer circumferential surface of a base side portion of the insulator over the entire circumference thereof, and pressing the assembly so as to close the opening by the assembly; and (d) a step of pressurizing the interior of the pressure container and applying a predetermined voltage between the terminal electrode and the metallic shell.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: October 15, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Masafumi Okuda, Toshiyuki Otsuki, Kanako Nishiyama
  • Patent number: 10418789
    Abstract: A spark plug suppressor and a method of producing a spark plug suppressor from a suppressor precursor liquid that may be cured at a temperature below 300° C. The spark plug suppressor may include particles or grains dispersed in a matrix of electrically conducting material, electrically semiconducting material, or electrically non-conducting material. The suppressor may include a conductive glass seal component and a resistive suppressor component. The resistive suppressor component may be at least partially embedded in the glass seal component, and the glass seal component may seal a center electrode of the spark plug, a terminal of the spark plug, or both the center electrode and the terminal.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: September 17, 2019
    Assignee: Federal-Mogul Ignition LLC
    Inventors: Shuwei Ma, Keith Firstenberg, William J. Walker, Jr., Michael Saccoccia
  • Patent number: 10320157
    Abstract: A spark plug includes a tubular metal shell having a tapered portion that projects radially outward with respect to an external thread and is provided on a rear end side of the metal shell with respect to the external thread, a center electrode held in an insulated manner at a center of the metal shell on a front end side thereof, and a ground electrode connected to the metal shell to form a spark gap between the ground electrode and the center electrode. The tapered portion has a contact portion that contacts the inner surface of a plug hole formed in an engine when the external thread is tightened into a threaded hole in the plug hole. The Vickers hardness of the contact portion is higher than the Vickers hardness of at least a part of a portion between the contact portion and the external thread.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: June 11, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Shunsuke Maki
  • Patent number: 10038309
    Abstract: A ceramic spark plug insulator with improved electrical and mechanical strength.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: July 31, 2018
    Assignee: Robert Bosch GMBH
    Inventor: Klaus Bundschuh
  • Patent number: 10008832
    Abstract: A spark plug electrode having greater mechanical stability. The spark plug electrode includes a base body and a noble metal pin situated on the base body, the base body and the noble metal pin being connected to each other by a connection zone. The connection zone has at least one first welding seam and one second welding seam.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: June 26, 2018
    Assignee: ROBERT BOSCH GMBH
    Inventors: Dennis Quest, Detlef Hartmann, Dominic Lang, Guido Hannich, Stefan Nufer
  • Patent number: 9964063
    Abstract: Within a resin mold portion of a fuel injection valve, an amplifying member having a substrate is provided. An engagement hole that penetrates in an axial direction is formed in another end part of the amplifying member, and an engagement pin, which is formed on a bobbin of a housing, is inserted through the engagement hole. A second connector of a second signal transmitting member, which constitutes part of a signal transmitting unit, is inserted from below into a connecting hole formed in the substrate. In addition, when the resin mold portion is molded, the amplifying member is retained in a state with the engagement pin and the second connector being inserted, respectively, into the engagement hole and the connecting hole.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: May 8, 2018
    Assignee: KEIHIN CORPORATION
    Inventors: Gaku Sato, Kenichi Yoshimura, Keisuke Machida, Koji Suzuki
  • Patent number: 9887520
    Abstract: A method for producing a spark plug for internal combustion engines, in particular for gas-powered internal combustion engines, having a metallic shell, a ceramic insulator held in the shell, a center electrode embedded in the insulator, at least one ground electrode attached to a front end of the shell, an end piece made of a precious metal and/or alloy attached to a front end of the center electrode, and a counterpart made of a precious metal and/or alloy attached to the ground electrode opposite the end piece, between which is a spark gap with a nominal width. The spark gap is produced initially with a width that is smaller, at least in places, than the nominal width, and is subsequently brought to its nominal width by removing material from at least one of the two surfaces of the end piece and the counterpart that delimit the spark gap.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: February 6, 2018
    Assignee: FEDERAL-MOGUL IGNITION GMBH
    Inventor: Andreas Zeh
  • Patent number: 9879646
    Abstract: A ceramic glow plug includes a ceramic heater; a tubular sleeve which holds the outer circumference of the ceramic heater with a front end portion thereof protruding from the front end of the sleeve; and a tubular housing which surrounds a rear end portion of the ceramic heater and has a mounting portion for mounting the housing. The sleeve has a small-diameter portion which is accommodated in a front end portion of the housing and has an outer diameter smaller than the inner diameter of the front end portion of the housing, and a large-diameter portion which is connected to the small-diameter portion, disposed frontward of the front end portion of the housing, and has a diameter larger than the inner diameter of the front end portion of the housing. The front end portion of the housing is welded to the large-diameter portion.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: January 30, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Takashi Hirata
  • Patent number: 9859689
    Abstract: In a cross section including a central axis, a value L/D obtained by dividing an axial length L of an overlap portion where a metal contact surface located on a metal shell and on which a packing is in contact with the metal shell overlaps a projection plane located on the metal shell and on which a contact surface located on an insulator and on which the packing is in contact with the insulator is projected in a direction orthogonal to the central axis by a difference D between a radius of an outer circumference of a tube portion at a connection position to a step portion and a radius of an outer circumference of a leg portion at a connection position to the step portion is 1.2 or more. This ensures the force of constraint in the radial direction provided by the packing on the insulator.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: January 2, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Naoki Sadaka
  • Patent number: 9825435
    Abstract: A crimping-pressing step including (1) a step of bringing the crimping jig into contact with a to-be-crimped portion and moving the crimping jig forward such that a load acting on the crimping jig reaches a preset contact load, and (2) a buckling step of further moving the crimping jig forward by a preset distance and then stopping the crimping jig. The difference between the target moving distance of the crimping jig and its actual moving distance is reduced by adjusting at least one of the preset contact load and the preset distance on the basis of at least one of a first overshoot amount in the step (1) and a second overshoot amount in the step (2).
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: November 21, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Tomoki Kawai
  • Patent number: 9735552
    Abstract: A spark plug includes: an insulator having an axial hole; a conductive member disposed around the insulator; a center electrode disposed inside the axial hole, having a bar shape extending in the axial direction, and located on a rear end side with respect to a front end of the conductive member; a ground electrode forming a spark gap between the ground electrode and the center electrode; and a connection part including a plurality of spokes extending in a radial direction whose inner ends are connected to the ground electrode, and connecting the conductive member to the ground electrode. The connection part includes a joint part that is jointed to an inner surface of the conductive member, and the ground electrode has at least one of a notch and a groove at a position that is different from a position connected to the spokes in a circumferential direction.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: August 15, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Tatsunori Yamada, Yusuke Fuji, Tomoyuki Igarashi, Kei Takahashi
  • Patent number: 9705221
    Abstract: An electronic component includes at least a contact member having, on a surface of a contact portion adapted to come into contact with another contact member, at least an undercoat plating layer and a main plating layer formed on the undercoat plating layer. A coating containing a fluorine-based oil is provided on the main plating layer, and the coating has a dry coating weight per unit area on the main plating layer of greater than or equal to 0.011 mg/cm2.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: July 11, 2017
    Assignee: DDK LTD.
    Inventor: Yoshihiro Tadokoro
  • Patent number: 9651306
    Abstract: A method for drying a seal material for use in manufacturing an ignition device, e.g., a spark plug. A free-flowing or loose seal material having a moisture content is provided and brought together with a desiccant for a time sufficient to produce a dry seal material by reducing the moisture content of the loose seal material to a desired level. Thereafter, the dry seal material and the desiccant may be separated from one another so that the dry seal material can be used to form a seal within an internal bore of a spark plug.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: May 16, 2017
    Assignee: FEDERAL-MOGUL IGNITION COMPANY
    Inventor: Keith Firstenberg
  • Patent number: 9614353
    Abstract: A spark plug comprises a ground electrode including a chip whose one end has a cylinder shape having a diameter A from 0.8 to 1.2 mm and whose main component is a noble metal, and an electrode base material. In the ground electrode, a portion of the other end of the chip is joined to the electrode base material through a fused portion. The spark plug also comprises a chip-and-base-material interface in which the chip and the electrode base material contact each other and which is surrounded by the fused portion. In a cross section passing through a center axis, a distance between an end point Pa7 located on the chip-and-base-material interface and an end point Pa5 located on an interface between the chip and the fused portion is equal to or greater than 0.7 times the diameter A.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: April 4, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Yusuke Kawashima
  • Patent number: 9608411
    Abstract: In a spark plug, an annular gap is formed between a metallic shell and an outer surface of a leg portion of an insulator. A contact end position is provided at a front most position of a contact portion formed between a packing and the metallic shell. A radial distance between the outer surface of the leg portion and an inner surface of the metallic shell is a gap distance. A maximum end position is provided at the rear end of the annular gap maximum portion. The gap distance at a front end of the metallic shell is larger than the gap between the center electrode and the ground electrode. The metallic shell includes an increased inner diameter portion having an inner diameter at the front side relative to the contact end position. The maximum end position is located at the rear side relative to an intermediate position.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: March 28, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Hidetaka Hisada
  • Patent number: 9391429
    Abstract: A spark plug for an internal combustion engine, including: a center electrode having a first noble metal pin of a first diameter mounted thereon, and a ground electrode having a second noble metal pin of a second diameter mounted thereon, the noble metal pins of the center electrode and of the ground electrode being mutually opposed at the end faces thereof; and the first diameter of the first noble metal pin of the center electrode being larger than the second diameter of the second noble metal pin of the ground electrode.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: July 12, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Detlef Hartmann, Dietrich Trachte
  • Patent number: 9287686
    Abstract: A composite ignition device includes a positive electrode having a tip formed thereon that is bonded to a first insulator to form a firing cone assembly. A second insulator having a negative capacitive element embedded therein is attached to the firing cone assembly. A positive capacitive element is disposed in the second insulator and is separated from the negative capacitive element by the second insulator. The positive capacitive element is coupled to the positive electrode. The positive and negative capacitive elements form a capacitor. A resistor is coupled to the positive capacitive element. An electrical connector is coupled to the resistor and attached to the second insulator. A shell including a negative electrode having a tip is attached to the second insulator and the firing cone assembly and coupled to the negative capacitive element. The negative electrode tip is spaced apart from the positive electrode tip.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: March 15, 2016
    Assignee: Enerpulse, Inc.
    Inventor: Louis S. Camilli
  • Patent number: 9276383
    Abstract: A spark plug includes a ceramic insulator having an engagement portion, and a metallic shell provided around the ceramic insulator and having a protrusion. The protrusion has a diameter-decreasing portion, which seats on the engagement portion via an annular seat packing. On a cross section including an axial line, ?s>?p is satisfied, where ?p represents an acute angle (°) between a straight line orthogonal to the axial line and the contour of the engagement portion, and ?s represents an acute angle (°) between a straight line orthogonal to the axial line and the contour of the diameter-decreasing portion. In the aforementioned cross section, Hvo>Hvi is satisfied, where Hvo represents the Vickers hardness (Hv) of the seat packing at the midpoint of a first line segment, and Hvi represents the Vickers hardness (Hv) of the seat packing at the midpoint of a second line segment.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: March 1, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Keiji Ozeki, Tomoaki Kato, Naoyuki Mukoyama, Tsutomu Kobayashi
  • Patent number: 9249775
    Abstract: Method for igniting a fuel/air mixture in a cyclically operating internal combustion engine comprising combustion chambers which are delimited by walls that are at ground potential, using an ignition device comprising an ignition electrode provided in each combustion chamber, in which method, via an electrical DC/AC converter, an electric oscillating circuit is excited, which is connected to the secondary side of the DC/AC converter, and in which the ignition electrode, which is guided through one of the walls delimiting the combustion chamber in a manner in which it is electrically insulated from said walls by an insulator and extends into the combustion chamber, constitutes a capacitance in cooperation with the walls of the combustion chamber that are at ground potential, and in which the excitation of the oscillating circuit is controlled so a corona discharge igniting the fuel/air mixture is created in each combustion chamber at the ignition electrode.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: February 2, 2016
    Assignee: BORGWARNER BERU SYSTEMS GMBH
    Inventors: Torsten Schremmer, Gerd Bräuchle, Martin Trump, Steffen Bohne
  • Patent number: 9219350
    Abstract: A spark plug includes a tubular housing, a tubular insulator retained in the housing, a center electrode secured in the insulator, and a ground electrode provided at a distal end of the housing. The housing has a seat portion formed on its inner periphery. The insulator has a distal portion, a proximal portion, and a shoulder formed on an outer periphery of the insulator between the distal and proximal portions. The shoulder is arranged to seat on the seat portion of the housing with an annular packing interposed therebetween. On an inner peripheral surface of the seat portion of the housing which faces an outer peripheral surface of the distal portion of the shoulder, there are formed uneven portions that are arranged in a circumferential direction of the spark plug. Each of the uneven portions consists of a protrusion and a recess that adjoin each other in the circumferential direction.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: December 22, 2015
    Assignee: DENSO CORPORATION
    Inventor: Masamichi Shibata
  • Patent number: 9112334
    Abstract: A spark plug is disclosed and comprises: a metal tube which interiorly defines an axis and is externally-threaded for engine block engagement; an insulator having a portion which is disposed inside the tube and extends therebeyond; a positive electrode extending through the insulator and projecting beyond the extending portion of the insulator; and an annular ground electrode coupled to the tube. The electrodes are configured such that a spark gap defined therebetween comprises an elongate channel which opens axially and away from said insulator and is substantially unobstructed in the axial direction. The ground defines a void having: a central portion occupied by the positive electrode in use; an annular channel surrounding the central portion; and a plurality of lobes, each being positioned with respect to the central portion in a manner analogous to the placement of the planet gears with respect to the sun gear in a planetary gear.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: August 18, 2015
    Assignee: Nano Spark Inc.
    Inventor: Mark Farrell
  • Patent number: 9041274
    Abstract: A spark plug has a shell, an insulator, a center electrode, a ground electrode, and a firing pad. The firing pad is made of a precious metal material and is attached to the ground electrode. The firing pad has a side surface at a peripheral edge that can be flush or nearly flush with a free end surface of the ground electrode. This construction can help improve ignitability and flame kernel growth of the spark plug during a sparking event, and can provide better thermal management at the attached ground electrode and firing pad.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: May 26, 2015
    Assignee: Federal-Mogul Ignition Company
    Inventors: Kevin J. Kowalski, Frederick J. Quitmeyer, Nathan A. Thomson, Curtis W. Verhoff, Richard L. Keller
  • Patent number: 9041273
    Abstract: A corona igniter (20) for emitting a radio frequency electric field and providing a corona discharge (24) includes a central electrode (22) at a positive voltage, a grounded metal shell (30), and an insulator (28) with an abruption (34) extending radially outward relative to the central electrode (22). The abruption (34) is typically an increase of at least 15% of a local thickness (t) of the insulator (28) over less than 25% of a nose length (el) of an insulator nose region (74). The abruption (34) is typically one flank (82) of a protrusion or a notch, and the flank (82) faces the shell (30). The abruption (34) reverses the electric field and voltage potential gradient along the insulator outer surface (32), repels charged ions away from the insulator (28), and thus prevents the formation of a conductive path between the central electrode (22) and the shell (22).
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: May 26, 2015
    Assignee: Federal-Mogul Ignition Company
    Inventors: John Antony Burrows, James D. Lykowski
  • Patent number: 9035562
    Abstract: A technique for lowering power loss involved in supply of high-frequency electric power to an ignition plug. The ignition plug includes a tubular insulator having an axial bore extending therethrough; a center electrode disposed in the axial bore; a metal terminal disposed rearward of the center electrode in the axial bore, electrically connected to the center electrode, and supplied with high-frequency electric power from an external source; a metallic shell disposed to circumferentially surround the insulator; and a ground electrode electrically connected to the metallic shell and adapted to generate plasma in cooperation with the center electrode through supply of high-frequency electric power to the metal terminal. At least a portion of the inner surface of the axial bore is coated with metal coating. The center electrode and the metal terminal are in electrical contact with the metal coating.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: May 19, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kohei Katsuraya, Tatsunori Yamada, Katsutoshi Nakayama
  • Patent number: 9016253
    Abstract: There is provided a spark plug for an internal combustion engine, including: a center electrode extending in the direction of an axis of the spark plug and having a core of higher thermal expansion coefficient than that of a front end thereof, the center electrode including a flanged portion radially outwardly protruding on a rear side thereof and a cylindrical portion located closer to a front end of the spark plug than the flanged portion and being smaller in diameter than the flanged portion; an insulator having an axial hole in the direction of the axis to retain the flanged portion in the axial hole with the cylindrical portion held in a loose-fit state in the axial hole; and a metal shell accommodating the insulator, wherein the spark plug satisfies the following condition: Cb<Cf where Cb is a difference between an inner diameter of the axial hole and an outer diameter of the cylindrical portion at an arbitrary axial position B in the direction of the axis; and Cf is a difference between the inner di
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: April 28, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kaori Kishimoto, Katsutoshi Nakayama, Hiroyuki Kameda, Tomoaki Aoki
  • Patent number: 8994256
    Abstract: An igniter for an internal combustion engine includes a center electrode, an insulator disposed about the center electrode, and a ground shield or a threaded portion disposed about the insulator, wherein the insulator includes a tip portion extending past an end portion of the ground shield and a tip portion of the center electrode extending through and away from the tip portion of the insulator. The igniter further includes a cap secured to the center electrode, wherein the cap extends past and covers a distal end of the tip portion of the center electrode and a distal end of the tip portion of the insulator. A spark gap is disposed between a peripheral edge of the cap and the end portion of the ground shield or threaded portion wherein the peripheral edge of the cap is spaced away from a surface of the tip portion of the insulator.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: March 31, 2015
    Assignee: Fram Group IP LLC
    Inventors: Matthew Brian Below, Jeff Boehler, Corey Eiden
  • Patent number: 8981632
    Abstract: A spark plug is provided. The spark plug has an insulative sleeve with a central axial bore and an exterior surface of a shaped tip portion. A coating is disposed on the exterior surface of the shaped tip portion and the coating comprises a transition metal compound or a combination of transition metal compounds, and an alkali metal compound. A center electrode extends through the central axial bore of the insulative sleeve. A metal sleeve is provided, wherein the insulating sleeve is positioned within, and secured to, the metal shell. A ground electrode is coupled to the metal shell and positioned in a spaced relationship relative to the center electrode so as to define a spark gap.
    Type: Grant
    Filed: April 13, 2012
    Date of Patent: March 17, 2015
    Assignee: Fram Group IP LLC
    Inventors: Peter D. Unger, Ronald P. Rohrbach, Jeffrey T. Boehler, Jing Zheng
  • Patent number: 8981633
    Abstract: A technique of reducing occurrence of multiple discharge in a spark plug. The spark plug has a main ground electrode and three auxiliary ground electrodes. The position at which first auxiliary ground electrode is joined to a metallic shell is located opposite the position at which main ground electrode is joined to the metallic shell, with respect to a center electrode. The positions at which second and third auxiliary ground electrodes are joined to the metallic shell are located opposite to each other with respect to the center electrode. When the width of first auxiliary ground electrode is represented by W, the shortest distance between second auxiliary ground electrode and third auxiliary ground electrode is represented by T, and a distance which is a component of the shortest distance T in a direction orthogonal to first auxiliary ground electrode is represented by Tp, a relation W?Tp is satisfied.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: March 17, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yasushi Sakakura, Yuichi Matsunaga
  • Patent number: 8970097
    Abstract: A spark plug for an internal combustion engine capable of ensuring sufficient gastightness of a combustion chamber and meeting demand for a reduction in diameter.
    Type: Grant
    Filed: January 21, 2010
    Date of Patent: March 3, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yuichi Yamada, Hiroaki Kuki, Ryuma Kawachi
  • Patent number: 8970096
    Abstract: Disclosed herein is a spark plug comprising an insulative sleeve having a central axial bore and an exterior surface and a center electrode extending through the central axial bore of the insulative sleeve. The insulating sleeve is positioned within, and secured to, a metal shell that serves as a mounting platform and interface to an internal combustion engine. The metal sleeve also supports a ground electrode that is positioned in a spaced relationship relative to the center electrode so as to generate a spark gap. The insulating sleeve includes a shaped tip portion that resides in a recessed end portion of the metal shell. A coating is disposed on the exterior surface of the shaped tip portion of the insulative sleeve. The coating comprises a metal oxide, a noble metal, late transition metal, or a combination comprising two or more of the foregoing metals.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: March 3, 2015
    Assignee: Fram Group IP LLC
    Inventors: Peter Unger, Ron Rohrbach, Jeff Boehler, Jing Zheng
  • Patent number: 8963407
    Abstract: A spark plug includes an insulator having an axial hole, a first inner circumferential surface, a second inner circumferential surface whose diameter is greater than that of the first inner circumferential surface, and a ledge portion connecting the first and the second inner circumferential surfaces. The spark plug also includes a center electrode having a large-diameter portion, a projection portion, and a circular columnar leg portion that projects into a space surrounded by the first inner circumferential surface. The spark plug includes a seal portion which fixes the center electrode within the axial hole. When C<A, A?C?B?A, where A represents a diameter of an imaginary cylinder having the minimum diameter required for surrounding the projection portion, B represents a maximum diameter of the large-diameter portion, and C represents an average diameter of the leg portion present in the space surrounded by the first inner circumferential surface.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: February 24, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Satoru Ochiai, Haruki Yoshida, Takamitsu Mizuno, Atsushi Tsukada
  • Patent number: 8946976
    Abstract: A spark plug includes a metal shell, a ground electrode joined to a front end portion of the metal shell and a nickel layer formed on the ground electrode, wherein the ground electrode has a base material exposed region in which a base material of the ground electrode is exposed; and wherein the nickel layer includes an outer-lateral-side nickel layer located on an outer lateral surface of the ground electrode at a position adjacent to the base material exposed region and satisfies a condition of LA?25 ?m, where LA is a length from a first part of the outer-lateral-side nickel layer having a thickness equal to 80% of a maximum thickness of the outer-lateral-side nickel layer to a second part of the outer-lateral-side nickel layer having a thickness equal to 20% of the maximum thickness of the outer-lateral-side nickel layer in a longitudinal direction of the ground electrode.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: February 3, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kazuhiro Kodama, Hiroaki Nasu
  • Patent number: 8925531
    Abstract: Methods and systems are provided for identifying and indicating degradation of an engine cylinder spark plug. In response to a cylinder misfire event during selected engine operating conditions, followed by an occurrence of a threshold number and/or rate of pre-ignition events in the same cylinder, a controller may determine that the spark plug is degraded. The controller may limit combustion in the cylinder in response to the degradation. Additionally, cylinder pre-ignition mitigating steps may be taken.
    Type: Grant
    Filed: January 20, 2014
    Date of Patent: January 6, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: Ralph Wayne Cunningham, Michael Joseph Zaitz, Ken Jahr, Chris Paul Glugla, Robert Sarow Baskins
  • Patent number: 8912715
    Abstract: A spark plug having a center electrode, a ground electrode, and a ground electrode side tip. The tip partially projects from a front end face and an inner circumference-side side surface of the ground electrode. The ground electrode has a center of the front end face, which center is located at a front end side in a direction of the axis with respect to a front end of the center electrode.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: December 16, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventor: Kenji Ban
  • Patent number: 8907552
    Abstract: An ignition plug (1) includes a center electrode (5) extending in the direction of an axis (CL1), an insulator (2) having an axial hole (4) into which the center electrode (5) is inserted, a tip (31) joined to a forward end portion of the center electrode (5) by a fusion portion (35), and a ground electrode (27) forming a gap (33) in cooperation with the tip (31). The ignition plug generates high-frequency plasma at the gap (33) when high-frequency electric power is supplied to the gap (33). The forward end of the tip (31) is located forward of the forward end of the insulator (2) with respect to the direction of the axis (CL1). Also, at least a portion of the outer surface of the fusion portion (35) is located within the axial hole (4), and, the distance between a forward-end-side opening of the axial hole (4) and the rearmost end of the outer surface of the fusion portion (35), measured along the axis (CL1), is equal to or greater than 0.1 mm.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: December 9, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kohei Katsuraya, Katsutoshi Nakayama
  • Patent number: 8890393
    Abstract: The invention relates to a spark gap comprising a number of series-connected individual spark gaps which are placed in a stack arrangement, which are spaced apart from each other by insulating material discs and are provided with a spring contact, the individual spark gaps including ring-shaped or disc-shaped electrodes, and further comprising control elements for influencing the voltage distribution over the stack arrangement. According to the invention the ring-shaped or disc-shaped electrodes required to form one of the respective individual spark gaps are each inserted into an insulating body and held by same in a centered manner. The respective insulating material discs are located between and fixed by the insulating bodies.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: November 18, 2014
    Assignee: DEHN + SÖHNE GmbH + Co. KG
    Inventors: Bernhard Krauss, Michael Waffler, Arnd Ehrhardt, Stefanie Schreiter, Steffen Beier
  • Patent number: 8853928
    Abstract: A spark plug includes at least one of a center electrode or a ground electrode that is produced by the steps of: mixing a matrix metal with carbon so that the carbon content of the resultant mixture is adjusted to 80 vol. % or less; subjecting the mixture to powder compacting or sintering, to thereby form a core; placing the core in a cup formed of nickel or a metal containing nickel as a main component; and subjecting the cup to cold working. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: October 7, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Tomo-o Tanaka, Tsutomu Shibata, Takaaki Kikai
  • Patent number: 8853924
    Abstract: A spark ignition device, metal shell, and methods of construction are provided. The spark ignition device has a ceramic insulator extending along a longitudinal axis and a metal shell. The metal shell extends along the longitudinal axis to a distal end. A center electrode is received in the ceramic insulator and extends along the longitudinal axis. A ground electrode has an attachment end fixed by a weld joint to the distal end of the shell and a free end extending from the distal end to provide a spark gap. The weld joint includes a resistance weld joint and a laser weld joint, which in combination inhibit material expulsion; provide a reliable, strong attachment of the ground electrode to the shell; provide an improved heat transfer path between the ground electrode and the shell, and facilitate repeatable and accurate positioning of the ground electrode to the shell.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: October 7, 2014
    Assignee: Federal-Mogul Ignition Company
    Inventor: Frederick J. Quitmeyer
  • Patent number: 8841827
    Abstract: In a spark plug, a fusion zone where a ground electrode and a noble metal tip are fused together is formed in at least a portion of an interfacial region between the ground electrode and the noble metal tip. When the fusion zone is projected in the axial direction, the projected fusion zone overlaps 70% or more of the area of the noble metal tip. As viewed on a section which passes through the center of gravity of the noble metal tip and is perpendicular to the longitudinal direction of the ground electrode, the relational expression 1.3?B/A is satisfied, where A is the greatest thickness of the fusion zone along the axial direction, and B is the length from a portion having the greatest thickness of the fusion zone to the inner end of the fusion zone.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: September 23, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Nobuaki Sakayanagi, Katsutoshi Nakayama
  • Patent number: 8826876
    Abstract: A laser spark plug includes a laser light-producing device and a spark plug housing at the end of which facing the combustion chamber an injection lens for injecting laser light into the combustion chamber of an internal combustion engine is arranged. The spark plug housing includes a fastening zone for fastening the laser spark plug in a cylinder head of the internal combustion engine. A projection on the end of the spark plug housing facing the combustion chamber houses the injection lens. The outer diameter (D1) of the projection is smaller in the area of the injection lens than the outer diameter (D2) of the spark plug housing in the fastening zone.
    Type: Grant
    Filed: March 21, 2012
    Date of Patent: September 9, 2014
    Assignee: GE Jenbacher GmbH & Co OHG
    Inventors: Friedrich Gruber, Markus Kraus
  • Patent number: 8823251
    Abstract: A spark plug for use with internal combustion engines includes a metallic shell housing having a semi-cylindrical shroud partially surrounding the insulator and the center electrode and to which the ground electrode is joined. The semi-cylindrical shroud promotes improved heat dissipation from the ground electrode to the shell housing.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: September 2, 2014
    Assignees: DENSO International America, Inc., Denso Corporation
    Inventors: Jeongung Hwang, Nicholas C. Polcyn, Christopher Thomas
  • Patent number: 8816577
    Abstract: A spark plug (20) includes a center electrode (24) and a ground electrode (22). The electrodes (22, 24) include a core (26) formed of a copper (Cu) alloy and a clad (28) formed of a nickel (Ni) alloy enrobing the core (26). The Cu alloy includes Cu in an amount of at least 98.5 weight percent, and at least one of Zr and Cr in an amount of at least 0.05 weight percent. The Cu alloy includes a matrix of the Cu and precipitates of the Zr and Cu dispersed in the Cu matrix. The Ni alloy of the clad (28) includes Ni in an amount of at least 90.0 weight percent. The Ni alloy also includes at least one of a Group 3 element, a Group 4 element, a Group 13 element, chromium (Cr), silicon (Si), and manganese (Mn) in a total amount sufficient to affect the strength of the Ni alloy.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 26, 2014
    Assignee: Federal-Mogul Ignition Company
    Inventors: Shuwei Ma, James D. Lykowski
  • Patent number: 8810118
    Abstract: A spark plug includes a tubular insulator, a center electrode, a tubular metal shell, a ground electrode, and a pillar body tip. The tubular insulator has an axial hole penetrating in the direction of an axis. The pillar body tip includes one end face that is welded to the ground electrode and another end face that forms a gap with a front end portion of the center electrode. The ground electrode includes a part where the tip is to be welded. The surface forms a clearance with a part including a constituent material of the tip. The ground electrode includes a surface where a plating layer is disposed. The plating layer covers a surface excluding a formation part of the clearance. The clearance has a size A that is equal to or more than 0.01 mm and equal to or less than 0.5 mm.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: August 19, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventor: Nobuaki Sakayanagi
  • Patent number: 8807124
    Abstract: When the first switch is on, the ignition capacitor is charged up to a voltage value whose absolute value is larger than an output voltage value of a DC power source, through resonance caused by a resonance coil and the ignition capacitor; when the second switch is on, the ignition capacitor supplies energy to the ignition coil device, and when the second switch is off, the energy is released and a high voltage is applied across electrodes of an ignition plug.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: August 19, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kimihiko Tanaya
  • Patent number: 8810115
    Abstract: A sparkplug including an induction coil and an electrode. The induction coil includes two end portions, the electrode extending in a continuation of one of the two end portions. The induction coil includes a conducting wire wound to form a succession of turns, the one of the two end portions having a terminal turn connected to the electrode. The one of the two end portions includes a plurality of coaxial end turns that extend between the terminal turn and an upstream turn, and the terminal turn has a diameter smaller than the diameter of the upstream turn so to reduce strength of the electric field induced in the one of said two end portions near the terminal turn.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: August 19, 2014
    Assignee: Renault S.A.S.
    Inventors: Marc Pariente, Andre Agneray, Xavier Jaffrezic
  • Patent number: 8791626
    Abstract: A spark plug includes an insulator having a first end, the insulator having a center axis and a center electrode coupled to the insulator and having a center electrode tip extending beyond the first end of the insulator. The spark plug further includes a ground electrode having an end spaced from an end of the center electrode, the ground electrode having a first portion extending substantially parallel to the center axis and a second portion extending at an angle from the first portion and relative to the center axis. A ground electrode tip is disposed on the second portion of the ground electrode, wherein the ground electrode tip is spaced from the center electrode tip. A ring member is operatively connected to the center electrode proximate the center electrode tip.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: July 29, 2014
    Assignee: Fram Group IP LLC
    Inventors: Matthew B. Below, Jeffrey T. Boehler, Jerry Williams Reeves, Jr., Philip Treier
  • Patent number: 8747176
    Abstract: A method for forming a spark plug includes positioning an electrode center wire within an insulator and positioning at least one substance within the insulator and proximate the electrode center wire. The method further includes ultrasonically tamping the at least one substance to the electrode center wire.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: June 10, 2014
    Assignee: Fram Group IP LLC
    Inventors: Michael S. Lynch, Steven M. Brickner
  • Patent number: 8749125
    Abstract: A task of this invention is to provide a spark plug that is superior in withstand voltage characteristics at high temperatures. A spark plug of this invention is equipped with a center electrode, an insulator, and a metal shell, and is characterized by that the insulator is equipped with an alumina-based sintered body containing silicon component (Si component), magnesium component (Mg component), at least one component of calcium component, strontium component, and barium component, and a rare earth element component (RE component), that a grain boundary phase of the alumina-based sintered body has a hexaaluminate crystal containing the RE component, that, in the alumina-based sintered body, the weight ratio of the RE component to the Mg component is 5.4?RE oxide/MgO?17.5, and that the content of an alkali metal component in terms of oxide in a spot having a diameter of 0.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: June 10, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Katsuya Takaoka, Hironori Uegaki, Hirokazu Kurono, Toshitaka Honda