EP3214706B1 - Spark plug - Google Patents

Spark plug Download PDF

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Publication number
EP3214706B1
EP3214706B1 EP17156798.5A EP17156798A EP3214706B1 EP 3214706 B1 EP3214706 B1 EP 3214706B1 EP 17156798 A EP17156798 A EP 17156798A EP 3214706 B1 EP3214706 B1 EP 3214706B1
Authority
EP
European Patent Office
Prior art keywords
insulator
hole
opening
spark plug
metal shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17156798.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3214706A1 (en
Inventor
Masahiro Yamamoto
Keita Nakagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of EP3214706A1 publication Critical patent/EP3214706A1/en
Application granted granted Critical
Publication of EP3214706B1 publication Critical patent/EP3214706B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/02—Details
    • H01T13/16—Means for dissipating heat

Definitions

  • the present specification relates to a spark plug for igniting fuel gas in an internal combustion engine or the like.
  • Patent Document 1 discloses a technique by which, when the front end of an insulator of a spark plug used in an internal combustion engine protrudes to the combustion chamber side of the internal combustion engine, a front end portion of a metal shell disposed on the outer circumference of the insulator is caused to protrude to the combustion chamber side, and a ventilation hole is provided in the front end portion. According to this technique, the provision of the ventilation hole can achieve the effect of cooling the insulator and thus can enhance the anti-pre-ignition performance.
  • Patent Document 1 WO 2008/102842
  • spark plugs tend to be used under a higher temperature environment in which pre-ignition is likely to occur. For this reason, spark plugs are required to have a further enhanced anti-pre-ignition performance.
  • the present specification discloses a technique for enhancing the anti-pre-ignition performance of a spark plug for use in an internal combustion engine.
  • a spark plug according to claim 1 including:
  • gas that has been drawn into the combustion chamber passes through the through hole of the front end tube portion from the outer circumferential surface side, and is blown toward the front end of the insulator.
  • the gas drawn into the combustion chamber can be used so as to effectively cool the front end of the insulator. Accordingly, the occurrence of pre-ignition as a result of the front end of the insulator being excessively heated can be inhibited, so that it is possible to enhance the anti-pre-ignition performance of the spark plug.
  • the flow rate and the flow velocity of the gas passing through the through hole can be increased.
  • the four or more through holes allow the front end of the insulator to be effectively cooled, regardless of the circumferential position at which the spark plug is mounted to the internal combustion engine.
  • the spark plug is characterized in that the through hole is formed such that only an inner wall of the through hole is visible from the first opening when the first opening is seen from a direction perpendicular to the axis.
  • Gas flowing toward the insulator from a side closer to the circumferential position at which the ground electrode is connected is likely to be obstructed by the ground electrode.
  • the provision of the through hole at the circumferential position at which the ground electrode is connected allows the gas flowing toward the insulator from a side close to the circumferential position to be guided to the insulator, so that it is possible to enhance the anti-pre-ignition performance more effectively.
  • the present invention can be implemented in various forms.
  • the present invention can be implemented as a spark plug, an ignition system using the spark plug, an internal combustion engine having the spark plug mounted therein, an internal combustion engine in which the ignition system using the spark plug is mounted, or the like.
  • FIG. 1 is a cross-sectional view of an example of a spark plug according to an embodiment.
  • a dashed line illustrated therein indicates an axis CL of a spark plug 100.
  • the illustrated cross section is a cross section that includes the axis CL.
  • the direction parallel to the axis CL is also referred to as "axial direction”.
  • the downward direction in FIG. 1 is also referred to as a front end direction LD
  • the upward direction in FIG. 1 is also referred to as a rear end direction BD.
  • the front end direction LD is a direction extending from a metal terminal 40 described below toward electrodes 20, 30 described below.
  • a radial direction of a circle, around the axis CL, on a plane perpendicular to the axis CL is also simply referred to as "radial direction”
  • the circumferential direction of the circle is also simply referred to as “circumferential direction”.
  • the end in the front end direction LD is also simply referred to as a front end
  • the end in the rear end direction BD is also simply referred to as a rear end.
  • the spark plug 100 includes an insulator 10, a center electrode 20, a ground electrode 30, a metal terminal 40, a metal shell 50, a first conductive seal layer 60, a resistor 70, a second conductive seal layer 80, a first packing 8, a talc 9, a second packing 6, and a third packing 7.
  • the insulator 10 is a substantially cylindrical member having an axial bore 12 that extends along the axial direction and through the insulator 10.
  • the insulator 10 is formed by alumina being sintered (another insulating material may be used).
  • the insulator 10 includes a leg portion 13, a reduced outer diameter portion 15, a first trunk portion 17, a flange portion 19, and a second trunk portion 18, which are arranged in this order in the rear end direction BD.
  • the outer diameter of the reduced outer diameter portion 15 is gradually reduced in the front end direction LD.
  • a reduced inner diameter portion 16 that has its inner diameter gradually reduced in the front end direction LD is formed in the vicinity of the reduced outer diameter portion 15 (in the first trunk portion 17 in the example shown in FIG. 1 ).
  • the center electrode 20 is located in the axial bore 12 of the insulator 10 on the front end side thereof.
  • the center electrode 20 is a rod-shaped member that extends along the axial direction.
  • the center electrode 20 includes a center electrode tip 28 and a center electrode body 26.
  • the center electrode body 26 includes a leg portion 25, a flange portion 24, and a head portion 23, which are arranged in this order in the rear end direction BD.
  • the front end side portion of the leg portion 25 is exposed to the outside of the axial bore 12 on the front end side of the insulator 10.
  • the other portions of the center electrode 20 are held in the axial bore 12.
  • the surface, of the flange portion 24, on the front end side is supported by the reduced inner diameter portion 16 of the insulator 10.
  • the center electrode body 26 is formed by using, for example, nickel (Ni) or an alloy (e.g., NCF600, NCF601) containing nickel as a main component.
  • the center electrode body 26 may include a core material that is embedded therein and formed of copper or an alloy containing copper as a main component, having higher thermal conductivity than Ni or an alloy containing Ni as a main component.
  • the center electrode tip 28 is joined to the front end portion of the leg portion 25 of the center electrode body 26 by, for example, laser welding.
  • the center electrode tip 28 is formed of a material containing, as a main component, a noble metal having a high melting point.
  • a noble metal having a high melting point.
  • the metal terminal 40 is located in the axial bore 12 of the insulator 10 on the rear end side thereof.
  • the metal terminal 40 is a rod-shaped member that extends along the axial direction, and is formed by using a conductive material (e.g., a metal such as a low-carbon steel).
  • the metal terminal 40 includes a cap mounting portion 41, a flange portion 42, and a leg portion 43, which are arranged in this order in the front end direction LD.
  • the cap mounting portion 41 is exposed to the outside of the axial bore 12 on the rear end side of the insulator 10.
  • the leg portion 43 is inserted in the axial bore 12 of the insulator 10.
  • the columnar resistor 70 is disposed between the metal terminal 40 and the center electrode 20 in the axial bore 12 of the insulator 10.
  • the resistor 70 has a function of reducing electric wave noise generated when spark occurs.
  • the resistor 70 is formed from, for example, a composition containing glass particles as a main component, ceramic particles other than glass, and a conductive material.
  • the first conductive seal layer 60 is disposed between the center electrode 20 and the resistor 70, and the second conductive seal layer 80 is disposed between the metal terminal 40 and the resistor 70.
  • the center electrode 20 and the metal terminal 40 are electrically connected via the resistor 70 and the conductive seal layers 60 and 80.
  • Each of the conductive seal layers 60 and 80 is formed from, for example, a composition containing glass particles of a B 2 O 3 -SiO 2 -based material or the like and metal particles (Cu, Fe, etc.).
  • the metal shell 50 is a substantially cylindrical member having an insertion hole 59 that extends along the axis CL and through the metal shell 50.
  • the metal shell 50 is formed by using a low-carbon steel material (another conductive material (e.g., metal material) may be used).
  • the insulator 10 is inserted in the insertion hole 59 of the metal shell 50.
  • the metal shell 50 holds the insulator 10 so as to be disposed around the insulator 10 in the radial direction.
  • On the front end side of the metal shell 50 an end portion, of the insulator 10, on the front end side (a portion, of the leg portion 13, on the front end side in the present embodiment) is exposed to the outside of the insertion hole 59.
  • On the rear end side of the metal shell 50 an end portion, of the insulator 10, on the rear end side (a portion, of the second trunk portion 18, on the rear end side in the present embodiment) is exposed to the outside of the insertion hole 59.
  • the metal shell 50 includes a front end tube portion 55, a screw portion 52, a seat portion 54, a deformable portion 58, a tool engagement portion 51, and a crimp portion 53, which are arranged in this order in the rear end direction BD.
  • An annular gasket 5 formed by a metal plate being bent is fitted between the seat portion 54 and the screw portion 52.
  • the seat portion 54 is a flange-shaped portion.
  • the screw portion 52 is a substantially cylindrical portion having a screw for being screwed to a mounting hole of an internal combustion engine (e.g., a gasoline engine) formed on the outer circumferential surface thereof.
  • the front end tube portion 55 is a substantially cylindrical portion that is disposed on the front end side of the screw portion 52, and has no screw formed on the outer circumferential surface thereof.
  • the length, in the axial direction, of the front end tube portion 55 is preferably 1.5 mm or more, for example.
  • the front end tube portion 55 has a plurality of through holes 551 extending therethrough from the outer circumferential surface to the inner circumferential surface thereof. The details of the configuration of the front end tube portion 55 will be described later.
  • the metal shell 50 has a reduced inner diameter portion 56 disposed on the side forward of the deformable portion 58.
  • the inner diameter of the reduced inner diameter portion 56 is gradually reduced from the rear end side in the front end direction LD.
  • the first packing 8 is sandwiched between the reduced inner diameter portion 56 of the metal shell 50 and the reduced outer diameter portion 15 of the insulator 10.
  • the first packing 8 is an O-ring made of iron (another material (e.g., metal material such as copper) may be used).
  • the tool engagement portion 51 has a shape that allows a spark plug wrench to engage therewith (e.g., hexagonal columnar shape).
  • the crimp portion 53 is formed on the rear end side of the tool engagement portion 51.
  • the crimp portion 53 is disposed on the side rearward of the flange portion 19 of the insulator 10, and forms the end, of the metal shell 50, on the rear end side.
  • the crimp portion 53 is bent inward in the radial direction.
  • an annular space SP is formed between the inner circumferential surface of the metal shell 50 and the outer circumferential surface of the insulator 10.
  • the space SP is a space surrounded by the crimp portion 53 and the tool engagement portion 51 of the metal shell 50, and a rear end portion of the flange portion 19 and the second trunk portion 18 of the insulator 10.
  • the second packing 6 is disposed on the rear end side of the space SP.
  • the third packing 7 is disposed.
  • the packings 6 and 7 are each a C-ring made of iron (another material may be used). The portion between the two packings 6 and 7 in the space SP is filled with powder of the talc 9.
  • the crimp portion 53 is crimped so as to be bent inward.
  • the crimp portion 53 is then pressed toward the front end side.
  • the deformable portion 58 is deformed, and the insulator 10 is pressed toward the front end side, in the metal shell 50, through the packings 6 and 7 and the talc 9.
  • the first packing 8 is pressed between the reduced outer diameter portion 15 and the reduced inner diameter portion 56, and seals a portion between the metal shell 50 and the insulator 10.
  • the gas in a combustion chamber of the internal combustion engine is inhibited from leaking out through the portion between the metal shell 50 and the insulator 10. Further, the metal shell 50 is fixed to the insulator 10.
  • the ground electrode 30 includes a ground electrode body 33 and a ground electrode tip 38.
  • the ground electrode body 33 is a rod-shaped member that is electrically connected to the metal shell 50.
  • the ground electrode body 33 is formed by using, for example, Ni or an alloy (e.g., NCF600, NCF601) containing Ni as a main component.
  • the ground electrode body 33 may include a core material that is embedded therein and formed of copper or an alloy containing copper as a main component, having higher thermal conductivity than Ni or an a alloy containing Ni as a main component.
  • the ground electrode tip 38 is formed by using, for example, Pt (platinum) or an alloy containing Pt as a main component, specifically, Pt-20Ir alloy (platinum alloy containing 20% by mass of iridium) or the like.
  • FIG. 2 is an enlarged cross-sectional view of the vicinity of the front end of the spark plug 100.
  • the enlarged cross-sectional view shown in FIG. 2 is a cross-sectional view, taken along a cross section including the axis CL, of the vicinity of the front end of the spark plug 100 in the state of being mounted to a mounting hole PH of a head EH of an internal combustion engine.
  • FIG. 3 is a view of the spark plug 100 as seen from the front end side toward the rear end direction BD. To avoid the complexity of illustration, FIG. 3 shows the front end tube portion 55 of the metal shell 50 and a front end surface 13s of the leg portion 13 of the insulator 10, and illustration of the other components has been omitted.
  • the front end tube portion 55 is exposed in the combustion chamber of the internal combustion engine when the spark plug 100 is mounted to the internal combustion engine. More specifically, as shown in FIG. 2 , substantially the entire front end tube portion 55 protrudes from an inner wall surface IS of the head EH toward the inside of the combustion chamber when the spark plug 100 is mounted to the mounting hole PH of the head EH of the internal combustion engine.
  • the front end of the insulator 10 (i.e., the front end of the leg portion 13) is located on the side forward of the front end of the front end tube portion 55.
  • the front end of the center electrode body 26 and the center electrode tip 28 are located on the side forward of the front end of the insulator 10.
  • ground electrode body 33 One end of the ground electrode body 33 is a connection end 31 that is connected to the front end of the metal shell 50, for example, by resistance welding so as to allow the ground electrode 30 and the metal shell 50 to be electrically connected.
  • the other end of the ground electrode body 33 is a free end 32.
  • the ground electrode body 33 extends in the front end direction LD from the connection end 31 connected to the metal shell 50, and is bent toward the axis CL. The ground electrode body 33 then extends in a direction perpendicular to the axis CL, to reach the free end 32.
  • ground electrode tip 28 is welded to the aforementioned side surface of the ground electrode body 33 at a position opposing the center electrode tip 28.
  • the ground electrode tip 38 forms a spark gap between itself and the center electrode tip 28.
  • the through holes 551 formed in the front end tube portion 55 described above are formed so as to allow passage of gas that has been drawn into the combustion chamber of the internal combustion engine.
  • the plurality of through holes 551 have circumferential positions different from one another such that the circumferential positions at the front end tube portion 55 are dispersed.
  • the plurality of through holes 551 are disposed such that two through holes 551 having circumferential positions adjacent to each other form an equal circumferential angle ⁇ therebetween.
  • the position at which the connection end 31 of the ground electrode body 33 is connected is indicated by dashed lines.
  • one of the four through holes 551 is formed at a circumferential position at which the ground electrode 30 (ground electrode body 33) is connected to the metal shell 50.
  • FIG. 4 is an enlarged view of the vicinity of a through hole 551 shown in FIG. 2 .
  • the cross section shown in FIG. 4 can also be regarded as a cross section obtained by cutting the through hole 551 on a plane including the axis CL and the center of a first opening OP1 of the through hole 551 on the outer circumferential surface side.
  • the cross section shown in FIG. 4 also includes the center of a second opening OP2.
  • Each of the plurality of through holes 551 is a substantially cylindrical hole.
  • the first opening OP1 of each through hole 551 on the outer circumferential surface side is shifted in the rear end direction BD with respect to the second opening OP2 on the inner circumferential surface side. Therefore, each of the plurality of through holes 551 is inclined with respect to both the direction of the axis CL and the direction perpendicular to the axis CL.
  • Each of the plurality of through holes 551 is formed such that, when seen from the first opening OP1 of the through hole 551 on the outer circumferential surface side toward the second opening OP2 of the through hole 551 on the inner circumferential surface side, the front edge TP of the insulator 10 to be visually confirmed from the first opening OP1.
  • the front edge TP is an outer edge of the front end surface 13s of the leg portion 13 of the insulator 10.
  • a direction parallel to a line connecting the center of the first opening OP1 with the center of the second opening OP2 is taken as AR1.
  • the straight line furthest in the rear end direction BD is taken as L11
  • the straight line furthest in the front end direction LD is taken as L12.
  • the front edge TP of the insulator 10 and the space TA located on the side forward of the front edge TP are included between the two straight lines L11 and L12. Accordingly, in the example shown in FIG. 4 , it can be understood that the front edge TP of the insulator 10 can be visually confirmed clearly when the first opening OP1 of the through hole 551 is seen along the direction AR1.
  • each of the plurality of through holes 551 is formed such that the insulator 10 is not visible from the first opening OP1 when the first opening OP1 is seen along the direction AR2 perpendicular to the axis CL.
  • a straight line that is parallel to the direction AR2 and passes through the rear end of the first opening OP1 is taken as L21.
  • a straight line that is parallel to the direction AR2 and passes through the front end of the first opening OP1 is taken as L22.
  • all straight lines that are located between the two straight lines L21 and L22 and parallel to the direction AR2 pass through a wall portion, of the front end tube portion 55, in which no through hole 551 is formed. Accordingly, in the example shown in FIG. 4 , when the first opening OP1 of the through hole 551 is seen along the direction AR2, only the inner wall 551w of the through hole 551 is visible, and the insulator 10 cannot be visually confirmed.
  • the provision of the front end tube portion 55 protruding into the combustion chamber described above allows an ignition portion (i.e., a spark gap) of the spark plug 100 to protrude into the combustion chamber, without excessively increasing the length of the ground electrode body 33.
  • an ignition portion i.e., a spark gap
  • the ignition portion By causing the ignition portion to protrude into the combustion chamber so as to be located at a position away from the inner wall surface IS of the head EH, it is possible to inhibit the growth of a flame from being impeded by flame-quenching effect of the inner wall, thus enhancing the ignitability of the spark plug 100.
  • An excessive increase in the length of the ground electrode body 33 leads to an increased length to the connection end 31 to the metal shell 50 serving as the heat conduction starting point of the ground electrode body 33, thus resulting in reduced heat conduction performance. Further, an excessive increase in the length of the ground electrode body 33 results in reduced durability against vibration and impact. The provision of the front end tube portion 55 makes it possible to avoid such troubles.
  • a shock wave (pressure) that is higher than that normally occurs may occur in the combustion chamber as a result of, for example, the occurrence of abnormal combustion.
  • the provision of the front end tube portion 55 can inhibit such a shock wave occurring during abnormal combustion from directly impacting the leg portion 13 of the insulator 10, thus making it possible to inhibit the insulator 10 from being damaged.
  • Intake gas has a lower temperature than, for example, combustion gas, and thus is suitably used for cooling the insulator 10. If intake gas does not flow into the vicinity of the front end of the insulator 10, heat generated in the ignition portion is confined, so that the temperature of the front end portion of the insulator 10 is excessively increased, making it likely to cause the so-called pre-ignition.
  • the four through holes 551 formed in the front end tube portion 55 are provided for preventing such a trouble so as to enhance the anti-pre-ignition performance.
  • the front edge TP of the insulator 10 can be visually confirmed when seen from the first opening OP1 of the through hole 551 of the front end tube portion 55 on the outer circumferential surface side toward the second opening OP2 of the through hole 551 on the inner circumferential surface side. Accordingly, intake gas that has passed through the through hole 551 from the first opening OP1 side is directed toward the front end of the front end tube portion 55. Therefore, the intake gas inside the combustion chamber passes through the through hole 551 of the front end tube portion 55 from the outer circumferential surface side, and is blown toward the front end of the insulator 10. As a result, the intake gas inside the combustion chamber can be used so as to effectively cool the front end of the insulator 10. Accordingly, the occurrence of pre-ignition caused by the front end of the insulator 10 being excessively heated can be inhibited, thus making it possible to enhance the anti-pre-ignition performance of the spark plug 100.
  • the front end tube portion 55 has four through holes 551 having circumferential positions different from one another. As a result, the front end of the insulator 10 can be effectively cooled, regardless of the circumferential position at which the spark plug 100 is mounted to the internal combustion engine.
  • a flow direction AR ( FIG. 2 ) of intake gas in the combustion chamber is, for example, a direction extending from an intake port (not shown) toward an exhaust port (not shown) of the internal combustion engine.
  • the through hole 551 is preferably formed in the front end tube portion 55 at a circumferential position at which the direction extending from the first opening OP1 toward the axis CL is parallel to the flow direction AR.
  • the circumferential position of the through hole 551 in the combustion chamber may not always necessarily be constant. If the front end tube portion 55 has four or more through holes 551 having circumferential positions different from one another, it is highly likely that at least one through hole 551 is disposed in the combustion chamber at the above-described preferable circumferential position, or a position close to the preferable circumferential position. As a result, the front end of the insulator 10 can be efficiently cooled as described above.
  • the through hole 551 is formed such that the insulator 10 is not visible from the first opening OP1 when the first opening OP1 is seen from the direction AR2 perpendicular to the axis CL.
  • the through hole 551 is formed such that only the inner wall 551w of the through hole 551 is visible from the first opening OP1 when the first opening OP1 is seen from the direction AR2.
  • a shock wave pressure generated by abnormal combustion of the internal combustion engine from directly impacting the insulator 10 thorough the through hole 551. Accordingly, it is possible to prevent damage to the insulator 10 caused by abnormal combustion of the internal combustion engine, in particular, damage to the leg portion 13 having a relatively small thickness.
  • one through hole 551 is formed at a circumferential position at which the ground electrode 30 is connected to the metal shell ( FIG. 3 ). Intake gas flowing toward the insulator 10 from a side close to the circumferential position at which the ground electrode 30 is connected tends to be obstructed by the ground electrode 30 (in particular, the ground electrode body 33).
  • the through hole 551 at a circumferential position at which the ground electrode 30 is connected, it is possible to guide, to the insulator 10, the intake gas flowing from a side close to the circumferential position toward the insulator 10. As a result, it is possible to enhance the anti-pre-ignition performance more effectively.

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  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP17156798.5A 2016-03-02 2017-02-20 Spark plug Active EP3214706B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016040507A JP2017157451A (ja) 2016-03-02 2016-03-02 点火プラグ

Publications (2)

Publication Number Publication Date
EP3214706A1 EP3214706A1 (en) 2017-09-06
EP3214706B1 true EP3214706B1 (en) 2019-10-02

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EP17156798.5A Active EP3214706B1 (en) 2016-03-02 2017-02-20 Spark plug

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JP (1) JP2017157451A (zh)
CN (1) CN107154582B (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7233329B2 (ja) * 2019-07-18 2023-03-06 株式会社Soken スパークプラグ
JP7274375B2 (ja) 2019-07-18 2023-05-16 株式会社Soken スパークプラグ
CN113396513B (zh) * 2020-01-10 2022-06-03 日本特殊陶业株式会社 火花塞
CN115280615B (zh) * 2020-05-13 2023-10-10 日本特殊陶业株式会社 火花塞
JP7316253B2 (ja) * 2020-08-04 2023-07-27 日本特殊陶業株式会社 スパークプラグ

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Publication number Priority date Publication date Assignee Title
EP0071577A1 (fr) * 1981-07-30 1983-02-09 ESPADA ANSTALT, Universal Marketing Bougie d'allumage
DE8908502U1 (de) * 1988-07-14 1989-09-07 Park, Tae Hak, Suweonsi, Gyeong-gi do Zündkerze für Verbrennungsmotoren
GB2404422B (en) * 2003-07-29 2006-07-05 Federal Mogul Ignition Uk Ltd Spark plug
JPWO2008102842A1 (ja) 2007-02-23 2010-05-27 日本特殊陶業株式会社 スパークプラグ、及びスパークプラグを備えた内燃機関
EP2139083B1 (en) * 2007-03-26 2015-08-19 Ngk Spark Plug Co., Ltd. Spark plug
JP6015678B2 (ja) * 2014-01-09 2016-10-26 株式会社デンソー 内燃機関用のスパークプラグ

Non-Patent Citations (1)

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Title
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CN107154582A (zh) 2017-09-12
EP3214706A1 (en) 2017-09-06
CN107154582B (zh) 2020-05-12
JP2017157451A (ja) 2017-09-07

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