WO2017169929A1 - 内燃機関用のスパークプラグ - Google Patents

内燃機関用のスパークプラグ Download PDF

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Publication number
WO2017169929A1
WO2017169929A1 PCT/JP2017/011019 JP2017011019W WO2017169929A1 WO 2017169929 A1 WO2017169929 A1 WO 2017169929A1 JP 2017011019 W JP2017011019 W JP 2017011019W WO 2017169929 A1 WO2017169929 A1 WO 2017169929A1
Authority
WO
WIPO (PCT)
Prior art keywords
contour
electrode
outward
head
base end
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.)
Ceased
Application number
PCT/JP2017/011019
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English (en)
French (fr)
Japanese (ja)
Inventor
勇司 梶
宏二 山中
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.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Priority to US16/088,954 priority Critical patent/US10559944B2/en
Priority to DE112017001665.7T priority patent/DE112017001665B4/de
Publication of WO2017169929A1 publication Critical patent/WO2017169929A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
    • 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
    • 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
    • H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
    • H01T13/36—Sparking plugs characterised by features of the electrodes or insulation characterised by the joint between insulation and body, e.g. using cement
    • 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
    • H01T13/39—Selection of materials for electrodes
    • 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
    • H01T13/46—Sparking plugs having two or more spark gaps
    • H01T13/467—Sparking plugs having two or more spark gaps in parallel connection
    • 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
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs

Definitions

  • the present disclosure relates to a spark plug for an internal combustion engine used for an automobile engine or the like.
  • a spark plug for an internal combustion engine generally has a center electrode held inside a cylindrical insulator. That is, the center electrode is held inside the insulator so that the tip portion protrudes.
  • the center electrode includes a locking portion that is locked to the stepped portion formed on the inner peripheral surface of the insulator from the base end side, and an electrode head portion that is formed on the base end side of the locking portion.
  • the conductive glass is filled into the base end side of the center electrode inside the insulator.
  • a resistor and a stem are arranged on the base end side of the conductive glass. In this way, the center electrode is electrically connected to the stem through the conductive glass and the resistor.
  • the conductive glass is fixed to the electrode head of the center electrode. And in order to raise the adhesion strength of this electrode head part and electroconductive glass, in patent document 1, providing a recessed part in the base end surface of an electrode head is proposed.
  • This disclosure intends to provide a spark plug for an internal combustion engine that can improve the adhesion strength between the center electrode and the conductive glass.
  • One aspect of the present disclosure includes a cylindrical housing; A cylindrical insulator held inside the housing; A center electrode held inside the insulator so that the tip protrudes; and A ground electrode that forms a spark discharge gap with the center electrode; A conductive glass filled on the base end side of the center electrode inside the insulator, and The center electrode includes a locking portion that is locked from the base end side to a step portion formed on the inner peripheral surface of the insulator, and an electrode head portion that is formed on the base end side of the locking portion.
  • a concave portion is partially formed on the base end surface of the electrode head,
  • the concave contour that is the outer peripheral contour of the concave portion viewed from the plug axis direction forms a closed curve that is separated from the head contour that is the outer peripheral contour of the base end surface of the electrode head and surrounds the central axis of the central electrode.
  • the said recessed part outline is a spark plug for internal combustion engines which has the outward part which becomes convex toward the said head outline, and the inward part protruded convexly toward the central axis of the said center electrode.
  • the fixing strength between the center electrode and the conductive glass can be improved by making the shape of the recess provided on the base end face of the electrode head of the center electrode as described above.
  • the recess contour forms a closed curve that is separated from the head contour and surrounds the central axis of the center electrode.
  • strength of electrode head itself is securable.
  • the concave contour has an outward portion that is convex toward the head contour and an inward portion that protrudes toward the central axis of the center electrode.
  • Such a shape not only improves the adhesion area between the conductive glass that has entered the recess and the electrode head, but also the adhesion strength between the conductive glass and the central electrode in the rotational direction around the central axis. Can be improved. That is, in the conductive glass that has entered the recess, a portion corresponding to the inside of the outward portion of the recess contour and a portion corresponding to the outside of the inward portion of the recess contour in the electrode head are engaged in the rotational direction. It becomes. Therefore, the fixing strength between the conductive glass and the central electrode can be improved with respect to the force in the rotational direction around the central axis.
  • FIG. 1 is a cross-sectional view of a plane including a central axis of a spark plug for an internal combustion engine in Embodiment 1
  • FIG. 2 is an enlarged cross-sectional view of a plane including the central axis of the spark plug near the electrode head in the first embodiment
  • FIG. 3 is a perspective view of the center electrode near the electrode head in Embodiment 1
  • FIG. 4 is a plan view of the electrode head viewed from the base end side in the first embodiment
  • FIG. 5 is an explanatory plan view of the electrode head with various auxiliary lines added to FIG.
  • FIG. 1 is a cross-sectional view of a plane including a central axis of a spark plug for an internal combustion engine in Embodiment 1
  • FIG. 2 is an enlarged cross-sectional view of a plane including the central axis of the spark plug near the electrode head in the first embodiment
  • FIG. 3 is a perspective view of the center electrode near the electrode head in Embodiment 1
  • FIG. 4 is
  • FIG. 6 is a plan view of the electrode head viewed from the base end side in the second embodiment
  • FIG. 7 is a plan view of the electrode head viewed from the base end side in Embodiment 3
  • FIG. 8 is a plan view of an electrode head viewed from the base end side in Embodiment 4
  • FIG. 9 is a diagram showing the relationship between the parameter X1 and the resistance value change rate in Experimental Example 1.
  • FIG. 10 is a diagram showing the relationship between the parameter X2 and the resistance value change rate in Experimental Example 1.
  • FIG. 11 is a diagram showing the relationship between the distance d1 and the stress ratio in Experimental Example 2.
  • FIG. 12 is a plan view of an example of an electrode head having a concave contour that is not a rotationally symmetric shape; FIG.
  • FIG. 13 is a plan view of another example of the electrode head in which the recess contour has a shape that is not rotationally symmetric
  • FIG. 14 is a plan view of still another example of the electrode head in which the concave contour is not a rotationally symmetric shape.
  • the spark plug 1 includes a cylindrical housing 2, a cylindrical insulator 3, a center electrode 4, a ground electrode 5, and a conductive glass 6.
  • the insulator 3 is held inside the housing 2.
  • the center electrode 4 is held inside the insulator 3 so that the tip 41 protrudes.
  • a spark discharge gap G is formed between the ground electrode 5 and the center electrode 4.
  • the conductive glass 6 is filled on the proximal end side of the center electrode 4 inside the insulator 3.
  • the side on which the spark plug 1 is inserted into the combustion chamber is referred to as the distal end side, and the opposite side is referred to as the proximal end side.
  • the center electrode 4 has a locking portion 49 that is locked from the base end side to a step portion 31 formed on the inner peripheral surface of the insulator 3. Further, the center electrode 4 has an electrode head portion 42 formed on the proximal end side with respect to the locking portion 49. A recess 44 is partially formed in the base end face 43 of the electrode head 42.
  • the concave contour 440 that is the outer peripheral contour of the concave portion 44 viewed from the plug axis direction is separated from the head contour 420 that is the outer peripheral contour of the base end face 43 of the electrode head 42 and the center of the center electrode 4.
  • a closed curve surrounding the axis B is formed.
  • the plug axial direction is the axial direction of the spark plug 1 but coincides with the axial direction of the center electrode 4.
  • the concave contour 440 has an outward portion 45 and an inward portion 46.
  • the outward portion 45 is a portion of the concave contour 440 that is convex toward the head contour 420.
  • the inward portion 46 is a portion of the concave contour 440 that protrudes in a convex shape toward the central axis B of the central electrode 4.
  • the recess contour 440 has a shape having four outward portions 45 and four inward portions 46.
  • the recess contour 440 has a substantially rotationally symmetric shape about the central axis B. Specifically, the recess contour 440 has a four-fold rotationally symmetric shape.
  • the head contour 420 is circular with the central axis B as the center.
  • the head contour 420 is an outer peripheral contour of the base end face 43.
  • the tapered surface or A boundary line between the curved surface and the outer peripheral side surface 421 becomes a head contour 420.
  • the recess contour 440 is separated from the head contour 420. That is, the recessed portion contour 440 is formed inside the head contour 420 and is formed so as not to overlap the head contour 420 over the entire circumference. Thereby, the material of the electrode head part 42 exists over the entire circumference of the outer periphery of the recess 44.
  • the distance between the recessed part outline 440 and the head outline 420 is 0.1 mm or more. That is, as shown in FIG. 5, the distance d ⁇ b> 1 is 0.1 mm or more in the portion of the recess contour 440 that is the shortest distance from the head contour 420. That is, a metal material having a thickness of 0.1 mm or more is present on the entire circumference of the outer periphery of the recess 44. Specifically, in the recess contour 440, the distance d1 between the apex 459 of the outward portion 45 and the head contour 420 is 0.1 mm or more.
  • the outward portion 45 is formed in a curved shape.
  • the curve of the outward portion 45 is configured by a combination of curves having a curvature radius of 0.1 mm or more. That is, the apex portion 459 of the outward portion 45 is also curved and has a radius of curvature of 0.1 mm or more. Further, the inward portion 46 is also formed in a curved shape. The outward portion 45 and the inward portion 46 are smoothly connected.
  • the inward portion 46 protrudes to the central axis B side from the straight line L1 that contacts both of the pair of adjacent outward portions 45. In the present embodiment, the inward portion 46 protrudes toward the central axis B side from the straight line L2 that connects the apex portions 459 of the pair of adjacent outward portions 45.
  • the recess 44 is formed so that the vicinity of the central axis B is deepest.
  • the bottom of the recess 44 is formed in a curved surface shape.
  • the maximum depth of the recess 44 can be set to 0.5 to 1.5 mm, for example.
  • the center electrode 4 has a substantially cylindrical shape, and the tip 41 has a small diameter.
  • the tip portion 41 can be constituted by a noble metal tip made of an iridium alloy or the like.
  • a large-diameter locking portion 49 is formed in the vicinity of the base end portion of the center electrode 4.
  • the entire base end side portion of the locking portion 49 is the electrode head portion 42.
  • the electrode head 42 is also substantially cylindrical.
  • the center electrode 4 has a core material made of copper or the like, and a covering material covering the tip side and the outer peripheral side thereof.
  • the covering material is made of, for example, a nickel-based alloy.
  • the core material is exposed at a part of the base end face 43.
  • the recessed part 44 is formed in the exposed part of this core material.
  • the recess 44 is formed on the inner side of the covering material portion on the base end face 43.
  • the inside of the substantially cylindrical insulator 3 is filled with conductive glass 6 on the base end side of the center electrode 4.
  • a resistor 11 and a stem 12 are disposed on the inner side of the insulator 3 on the proximal end side of the conductive glass 6.
  • a conductive glass 60 is also disposed between the resistor 11 and the stem 12.
  • the center electrode 4 is electrically connected to the stem 12 via the conductive glasses 6 and 60 and the resistor 11.
  • the conductive glass 6 is fixed to the electrode head 42 of the center electrode 4. That is, the conductive glass 6 is in close contact with the outer peripheral side surface 421, the base end surface 43, and the inner surface of the recess 44 of the electrode head portion 42.
  • the conductive glass 6 is made of glass containing a conductor such as copper, for example.
  • the center electrode 4 is inserted inside the insulator 3. That is, the center electrode 4 is inserted into the insulator 3 from the base end of the insulator 3. Then, the locking portion 49 of the center electrode 4 is locked to the step portion 31 of the insulator 3. Thereby, the center electrode 4 is disposed at a predetermined position of the tip portion of the insulator 3.
  • a powder material to be the conductive glass 6 is filled inside the insulator 3 and disposed on the base end side of the center electrode 4. Furthermore, the powder material of the resistor 11, the powder material of the conductive glass 60, and the stem 12 are sequentially arranged inside the insulator 3. The powder material filled inside the insulator 3 is heated and melted while pressing the stem 12 against the insulator 3 toward the tip side. Then, by cooling, each powder material becomes the conductive glasses 6 and 60 and the resistor 11 and is fixed inside the insulator 3. Then, the conductive glass 6 is fixed to the electrode head 42 of the center electrode 4 and is also fixed to the resistor 11 and the inner wall of the insulator 3. In addition, the conductive glass 60 disposed on the proximal end side of the resistor 11 is fixed to the inner wall of the resistor 11, the stem 12, and the insulator 3.
  • the conductive glass 6 enters between the outer peripheral side surface 421 of the electrode head 42 of the center electrode 4 and the inner wall of the insulator 3 and also enters the recess 44.
  • the conductive glass 6 fixes the electrode head 42 from the inner surface of the recess 44 together with the outer peripheral side surface 421 and the base end surface 43 of the electrode head 42.
  • the fixing strength between the center electrode 4 and the conductive glass 6 can be improved by setting the shape of the recess contour 440 as shown in FIGS. 4 and 5.
  • the concave contour 440 forms a closed curve that is separated from the head contour 420 and surrounds the central axis B.
  • the strength of the electrode head 42 can be ensured. That is, the strength of the electrode head 42 can be effectively ensured by the presence of the material of the electrode head 42 over the entire circumference of the recess 44. As a result, it is possible to prevent the electrode head 42 from being deformed during the manufacture of the spark plug 1 and to secure the fixing strength to the conductive glass 6.
  • strength of the electrode head 42 can be made high by the distance d1 between the recessed part outline 440 and the head outline 420 being 0.1 mm or more.
  • the concave contour 440 has an outward portion 45 and an inward portion 46.
  • the concave contour 440 has an outward portion 45 and an inward portion 46.
  • the fixing strength between the conductive glass 6 and the center electrode 4 can be improved with respect to the force in the rotational direction around the central axis B.
  • the portion on the outer side of the inward portion 46 and the portion closer to the central axis B than the straight line L1 shown in FIG. 5 sufficiently receives the force in the rotational direction.
  • the outward portion 45 is formed in a curved shape. Thereby, it is easy to ensure the strength of the conductive glass 6 disposed inside the outward portion 45.
  • the curve of the outward portion 45 is configured by a combination of curves having a curvature radius of 0.1 mm or more. Thereby, the intensity
  • the shape of the recess contour 440 is different from that of the first embodiment. 6 has three outward portions 45 and three inward portions 46, respectively.
  • the recess contour 440 has a three-fold rotationally symmetric shape.
  • this embodiment is also a form in which the shape of the recess contour 440 is different from that of the first embodiment.
  • the concave contour 440 shown in FIG. 7 has six outward portions 45 and six inward portions 46.
  • the concave contour 440 has a six-fold rotationally symmetric shape. Note that, in the recessed portion contour 440, the apex portion 459 of the outward portion 45 and the apex portion 469 of the inward portion 46 are not curved. However, these vertex portions 459 and 469 may be curved. Other configurations are the same as those of the first embodiment, and the same effects are obtained.
  • Example 1 the adhesion strength between the electrode head 42 and the conductive glass 6 was evaluated for the spark plugs shown in the first to fourth embodiments.
  • various types of spark plug samples were manufactured by changing the dimensional relationship and the like based on the shapes of the concave contour 440 shown in the first to fourth embodiments. That is, as the basic shape of the recess outline 440, there are two outward portions 45 and inward portions 46 (see FIG. 8), three (see FIG. 6), and four (see FIG. 5). There are six (see FIG. 7). Then, these shapes are generalized and defined as the concave contours having N outward portions 45 and inward portions 46 as follows.
  • the recess contour 440 is formed by alternately providing N outward portions 45 and N inward portions 46 in the circumferential direction.
  • the first outward portion 45 to the Nth outward portion 45 are sequentially arranged, and the first inward portion 46 to the Nth inward portion 46 are successively arranged.
  • the kth outward portion 45 and the kth inward portion 46 are adjacent to each other.
  • the radius of the circumscribed circle C1 of the kth outward portion 45 centered on the central axis B is defined as Rk.
  • Let rk be the radius of the inscribed circle C2 of the kth inward portion 46 centered on the central axis B.
  • N is a natural number of 2 or more
  • k is a natural number of 1 to N.
  • FIG. 9 shows the measurement data plotted after analyzing the measurement results and taking the resistance value change rate on the vertical axis and the parameter X1 on the horizontal axis.
  • the parameter X1 is X1 represented by the following equation (3), and is a parameter corresponding to the left side of the later-described equation (1).
  • the resistance value change rate becomes 10% or less by setting the parameter X1 to 4.1 or more.
  • the resistance value change rate becomes 10% or less by setting the parameter X1 to 1.0 or more.
  • the shape of the recess contour 440 is preferably a shape that satisfies the inequality of the following equation (1).
  • N ⁇ 3 4.1.
  • the parameter X2 is X2 represented by the following formula (4), and is a parameter corresponding to the left side of formula (2) described later.
  • X2 (Rj ⁇ rj) / Rj (4)
  • the radius of the circumscribed circle C1 of the outward portion 45 is Rj
  • the radius of the inscribed circle C2 of the inward portion 46 is rj.
  • the data plotted in the graph of FIG. 10 is a value of X2 when the combination of the adjacent outward portion 45 and the inward portion 46 is selected so that X2 is the smallest, and their radii are Rj and rj. It was adopted.
  • the parameter X2 can be used as an appropriate index as the degree to which the undulation of the recessed portion contour 440 is not too intense.
  • At least one pair of the outward portion 45 and the inward portion 46 adjacent to each other satisfy the following formula (2) as the recess contour 440.
  • the radius of the circumscribed circle C1 of the outward portion 45 is Rj
  • the radius of the inscribed circle C2 of the inward portion 46 is rj. (Rj ⁇ rj) /Rj ⁇ 0.87 (2)
  • Example 2 In this example, as shown in FIG. 11, the relationship between the distance d1 between the recess contour 440 and the head contour 420 and the strength of the electrode head 42 was examined. That is, FEM analysis was performed assuming the pressure applied to the electrode head portion 42 of the center electrode 4 when actually manufacturing the spark plug 1.
  • FEM is an abbreviation for Finite Element Method, and means a finite element method.
  • samples a plurality of samples were prepared in which the concave contour 440 in the electrode head 42 shown in the first embodiment was made the basic shape while the concave contour 440 was changed little by little. The concave contour 440 of each sample changes the distance d1 from each other.
  • the stress ratio of each sample is plotted in FIG. In the figure, the vertical axis is the stress ratio and the horizontal axis is the distance d1.
  • the material in the stress concentration portion of the electrode head 42 is a Ni-based alloy.
  • the stress ratio can be 1.0 or less by setting d1 ⁇ 0.1 mm. That is, by setting d1 ⁇ 0.1 mm, it is possible to prevent the stress acting on the electrode head 42 during the manufacture of the spark plug 1 from exceeding the material strength. That is, by ensuring d1 ⁇ 0.1 mm, it is possible to prevent the electrode head 42 from being deformed when the spark plug 1 is manufactured.
  • the concave outline 440 has a rotationally symmetric shape.
  • the present invention is not necessarily limited thereto.
  • the recess contour 440 may be formed in a shape that is not rotationally symmetric about the central axis B. In these cases, the radii Rk and rk can vary greatly depending on k.
  • a plurality of circumscribed circles C1 and inscribed circles C2 also exist.
  • these circumscribed circles C1 are indicated by broken lines as C11, C12, and C13
  • the inscribed circles C2 are indicated as C21, C22, and C23, respectively.
  • These radii Rk and rk are denoted as R1, R2, R3, r1, r2, and r3, respectively.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
PCT/JP2017/011019 2016-03-30 2017-03-17 内燃機関用のスパークプラグ Ceased WO2017169929A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/088,954 US10559944B2 (en) 2016-03-30 2017-03-17 Spark plug for internal combustion engine
DE112017001665.7T DE112017001665B4 (de) 2016-03-30 2017-03-17 Zündkerze für eine Verbrennungskraftmaschine

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Application Number Priority Date Filing Date Title
JP2016069258A JP6613992B2 (ja) 2016-03-30 2016-03-30 内燃機関用のスパークプラグ
JP2016-069258 2016-03-30

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JP (1) JP6613992B2 (enExample)
DE (1) DE112017001665B4 (enExample)
WO (1) WO2017169929A1 (enExample)

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WO2021215051A1 (ja) * 2020-04-20 2021-10-28 日本特殊陶業株式会社 スパークプラグ

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JP6910496B1 (ja) 2020-04-06 2021-07-28 日本特殊陶業株式会社 スパークプラグ
US11621544B1 (en) 2022-01-14 2023-04-04 Federal-Mogul Ignition Gmbh Spark plug electrode and method of manufacturing the same
US11831130B2 (en) 2022-03-29 2023-11-28 Federal-Mogul Ignition Gmbh Spark plug, spark plug electrode, and method of manufacturing the same
US11837852B1 (en) 2022-07-27 2023-12-05 Federal-Mogul Ignition Gmbh Spark plug electrode with electrode tip directly thermally coupled to heat dissipating core and method of manufacturing the same
US12191637B1 (en) 2024-06-14 2025-01-07 Federal-Mogul Ignition Gmbh Spark plug with cooling features and method of manufacturing the same

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WO2021215051A1 (ja) * 2020-04-20 2021-10-28 日本特殊陶業株式会社 スパークプラグ
JP2021174581A (ja) * 2020-04-20 2021-11-01 日本特殊陶業株式会社 スパークプラグ
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US20190214791A1 (en) 2019-07-11
JP2017183105A (ja) 2017-10-05
DE112017001665B4 (de) 2024-02-08
DE112017001665T5 (de) 2018-12-13
JP6613992B2 (ja) 2019-12-04
US10559944B2 (en) 2020-02-11

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