WO2021215301A1 - 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

Info

Publication number
WO2021215301A1
WO2021215301A1 PCT/JP2021/015304 JP2021015304W WO2021215301A1 WO 2021215301 A1 WO2021215301 A1 WO 2021215301A1 JP 2021015304 W JP2021015304 W JP 2021015304W WO 2021215301 A1 WO2021215301 A1 WO 2021215301A1
Authority
WO
WIPO (PCT)
Prior art keywords
tip
diameter
center electrode
spark plug
small
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/JP2021/015304
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
明光 杉浦
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 DE112021002565.1T priority Critical patent/DE112021002565T5/de
Publication of WO2021215301A1 publication Critical patent/WO2021215301A1/ja
Priority to US17/970,092 priority patent/US11695256B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H01T13/38—Selection of materials for 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • 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
    • 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
    • H01T13/54—Sparking plugs having electrodes arranged in a partly-enclosed ignition chamber
    • 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

Definitions

  • This disclosure relates to spark plugs for internal combustion engines.
  • a core material having excellent thermal conductivity is arranged inside the center electrode in order to promote heat drawing at the tip of the center electrode. There is something. Then, in the spark plug disclosed in Patent Document 1, the core material is also arranged in the portion of the center electrode that protrudes toward the tip side of the insulating insulator.
  • the spark plug has the following problems. That is, one end of the discharge generated in the discharge gap (hereinafter, appropriately referred to as a discharge end) may move to the base end side along the side surface of the center electrode exposed from the insulator. In this case, when the discharge end reaches the position where the core material is arranged inside, it is conceivable that the base material of the portion covering the outer periphery of the core material is gradually consumed by the discharge. As described above, if the center electrode is consumed from the outer peripheral side, there is a concern that the inner core material may be exposed.
  • the present disclosure is intended to provide a spark plug for an internal combustion engine that can easily prevent the core material from being exposed.
  • One aspect of the present disclosure is a tubular insulator and A center electrode that is held on the inner peripheral side of the insulating insulator and has a tip protruding portion that protrudes from the insulating insulator to the tip side.
  • a cylindrical housing that holds the insulator on the inner circumference side, and It has a plug cover provided at the tip of the housing so as to cover the auxiliary combustion chamber in which the tip protrusion is arranged.
  • the plug cover is provided with a jet hole for communicating the sub-combustion chamber to the outside.
  • the center electrode has a base material and a core material arranged in the base material and having a higher thermal conductivity than the base material.
  • the core material has a large diameter portion and a small diameter portion continuously formed on the tip end side thereof.
  • the small-diameter portion has a small-diameter columnar portion that is smaller in diameter than the large-diameter portion and has a constant diameter in at least a part in the axial direction. At least a part of the small-diameter columnar portion is located in a spark plug for an internal combustion engine, which is arranged closer to the tip of the insulating insulator than the tip.
  • the core material in the center electrode has a large diameter portion and a small diameter portion. Then, at least a part of the small-diameter columnar portion in the small-diameter portion is arranged on the tip side of the tip of the insulating insulator. Therefore, it is easy to prevent the core material from being exposed due to the center electrode being consumed from the outer peripheral side.
  • FIG. 1 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the first embodiment.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • FIG. 4 is a cross-sectional explanatory view showing a state in which the discharge is stretched in the first embodiment.
  • FIG. 5 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the second embodiment.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. FIG.
  • FIG. 7 is a cross-sectional explanatory view showing a state in which a discharge is formed in the second embodiment.
  • FIG. 8 is a cross-sectional explanatory view showing a state in which the discharge is stretched in the second embodiment.
  • FIG. 9 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the third embodiment.
  • FIG. 10 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the fourth embodiment.
  • FIG. 11 is a view taken along the line XI of FIG.
  • FIG. 12 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the fifth embodiment.
  • FIG. 13 is a cross-sectional view taken along the axial direction in the vicinity of the tip protruding portion of the center electrode in the sixth embodiment.
  • FIG. 14 is a cross-sectional view taken along the axial direction near the tip of the spark plug in the seventh embodiment.
  • the spark plug 1 for an internal combustion engine of this embodiment has a tubular insulating insulator 3, a center electrode 4, a tubular housing 2, and a plug cover 5.
  • the center electrode 4 is held on the inner peripheral side of the insulating insulator 3. Further, the center electrode 4 has a tip protruding portion 41 protruding from the insulating insulator 3 toward the tip side.
  • the housing 2 holds the insulating insulator 3 on the inner peripheral side.
  • the plug cover 5 is provided at the tip of the housing 2 so as to cover the auxiliary combustion chamber 50 in which the tip protrusion 41 is arranged.
  • the plug cover 5 is provided with a jet hole 51 for communicating the auxiliary combustion chamber 50 with the outside.
  • the center electrode 4 has a base material 42 and a core material 6.
  • the core material 6 is arranged in the base material 42 and has a higher thermal conductivity than the base material 42.
  • the core material 6 has a large diameter portion 61 and a small diameter portion 62 continuously formed on the tip end side thereof.
  • the small diameter portion 62 has a smaller diameter than the large diameter portion 61. Further, the small diameter portion 62 has a small diameter columnar portion 621.
  • the small-diameter columnar portion 621 is a portion of the small-diameter portion 62 having a constant diameter in at least a part of the axial direction Z. At least a part of the small-diameter columnar portion 621 is arranged closer to the tip side than the tip end of the insulating insulator 3.
  • the spark plug 1 of this embodiment can be used as an ignition means in an internal combustion engine such as an automobile or a cogeneration engine, for example. Then, one end of the spark plug 1 in the axial direction is arranged in the combustion chamber of the internal combustion engine.
  • the combustion chamber of this internal combustion engine is referred to as a "main combustion chamber 11" as opposed to the above-mentioned "secondary combustion chamber 50".
  • the side exposed to the main combustion chamber 11 is referred to as the tip end side, and the opposite side thereof is referred to as the base end side.
  • the plug cover 5 is joined to the tip of the housing 2 by welding or the like. In a state where the spark plug 1 is attached to the internal combustion engine, the plug cover 5 separates the sub-combustion chamber 50 from the main combustion chamber 11. As shown in FIG. 1, in this embodiment, a plurality of injection holes 51 are formed in the plug cover 5. The flame generated in the sub-combustion chamber 50 is ejected from the injection hole 51 into the main combustion chamber 11. Further, in the compression stroke of the internal combustion engine or the like, as shown in FIG. 4, the airflow A is introduced from the main combustion chamber 11 to the sub-combustion chamber 50 through the injection hole 51.
  • At least one injection hole 51 is an axial injection hole 511 that is open in the axial direction Z.
  • the plug cover 5 has one axial injection hole 511 and a plurality of side injection holes 516.
  • the axial injection hole 511 is formed at a position overlapping the center electrode 4 in the axial direction Z.
  • the lateral injection hole 516 is formed on the outer peripheral side of the axial injection hole 511, and is inclined toward the outer peripheral side toward the tip side.
  • the axial injection hole 511 has a chamfered portion 512 at the end of the opening on the side of the auxiliary combustion chamber 50.
  • the chamfered portion 512 is formed in a tapered shape so that the diameter of the axial injection hole 511 increases toward the proximal end side.
  • the spark plug 1 of this embodiment has a ground electrode 7 arranged to face the tip protruding portion 41 of the center electrode 4 from the outer peripheral side.
  • the ground electrode 7 is joined to the vicinity of the joint portion of the plug cover 5 with the housing 2.
  • a discharge gap G is formed between the ground electrode 7 and the tip protruding portion 41 of the center electrode 4. That is, the discharge gap G is formed so as to face a part of the outer peripheral surface of the tip protruding portion 41.
  • the axial distance Z1 between the discharge gap G and the axial injection hole 511 is shorter than the axial Z distance d2 between the discharge gap G and the tip of the insulating insulator 3.
  • the distance d1 is larger than the size of the discharge gap G.
  • the discharge gap G is smaller than the shortest distance between the center electrode 4 and the plug cover 5.
  • the base material 42 of the center electrode 4 is made of a metal or alloy having excellent heat resistance.
  • the base material 42 can be made of, for example, a nickel (Ni) -based alloy such as Inconel (registered trademark).
  • the core material 6 of the center electrode 4 is made of a metal or alloy having excellent thermal conductivity.
  • the core material 6 can be made of, for example, copper or a copper alloy.
  • both the plug cover 5 and the ground electrode 7 can be made of, for example, a nickel-based alloy or the like.
  • the center electrode 4 has a substantially cylindrical shape. Then, in the cross section orthogonal to the axial direction Z, as shown in FIGS. 2 and 3, the outer peripheral contour of the core material 6 is substantially concentric with the outer peripheral contour of the center electrode 4. Then, as shown in FIG. 1, the boundary portion between the large diameter portion 61 and the small diameter portion 62 of the core material 6 has substantially the same position in the axial direction Z as the tip of the insulating insulator 3.
  • the large diameter portion 61 has a substantially constant diameter except for a part of the tip portion.
  • the small diameter portion 62 also has a substantially constant diameter except for a part on the tip side.
  • the portion having a substantially constant diameter is the small diameter columnar portion 621.
  • the portion on the tip side of the small-diameter columnar portion 621 is formed in a convex curve shape as a cross-sectional shape along the axial direction Z.
  • the tip protruding portion 41 of the center electrode 4 has a first portion 411 having the same diameter as the portion arranged inside the insulating insulator 3. Then, it has a second portion 412 having a diameter smaller than that of the first portion 411 on the tip side of the first portion 411.
  • the tip of the core material 6, that is, the tip of the small diameter portion 62 of the core material 6, is arranged at a position substantially equivalent to the tip of the first portion 411 in the axial direction Z.
  • a discharge gap G is formed on the outer peripheral side of the second portion 412. That is, the second portion 412 is entirely or mostly composed of the base material 42.
  • the large diameter portion 61 and the small diameter portion 62 of the core material 6 are both formed at portions of the center electrode 4 having substantially the same diameter. Therefore, the portion of the base material 42 that covers the outer peripheral side of the small diameter portion 62 is thicker than the portion that covers the outer peripheral side of the large diameter portion 61.
  • the base end of the small diameter portion 62 is formed at a position in the axial direction Z substantially equivalent to the tip of the insulating insulator 3. From the viewpoint of more reliably preventing the core material 6 from being exposed, it is desirable that the base end of the small diameter portion 62 is located closer to the base end side than the tip end of the insulating insulator 3.
  • the core material 6 in the center electrode 4 has a large diameter portion 61 and a small diameter portion 62. Then, at least a part of the small-diameter columnar portion 621 in the small-diameter portion 62 is arranged closer to the tip side than the tip of the insulating insulator 3. Therefore, it is easy to prevent the core material 6 from being exposed due to the center electrode 4 being consumed from the outer peripheral side.
  • a discharge is formed in the discharge gap G.
  • the discharge S is stretched toward the proximal end side by the airflow A as shown in FIG.
  • the airflow A toward the proximal end side is also generated in the discharge gap G. That is, for example, when the discharge S is generated in the compression stroke of the internal combustion engine, the airflow A that flows into the auxiliary combustion chamber 50 from the axial injection hole 511 and passes through the discharge gap G toward the base end side moves to the base end side. It is stretched.
  • the discharge end S1 on the center electrode 4 side moves to the base end side along the side surface of the center electrode 4.
  • the discharge end S1 consumes the center electrode 4 little by little. Since the outer layer of the center electrode 4 is made of the base material 42, it can be prevented from melting, but it is consumed. Therefore, if the portion of the base material 42 that covers the outer peripheral side of the core material 6 is consumed by the thickness thereof, the inner core material 6 will be exposed.
  • the core material 6 is made of a material having a relatively low melting point, for example, a copper alloy, it may elute when exposed to the outside. When such a situation occurs, the heat dissipation property of the center electrode 4 deteriorates, which may lead to problems such as pre-ignition.
  • the core material 6 is provided with a large diameter portion 61 and a small diameter portion 62, and the small diameter portion 62 is provided at the tip protruding portion 41 which is likely to be consumed among the center electrodes 4.
  • the structure is such that it is easy to prevent the core material 6 from being exposed while ensuring the heat dissipation of the core material 6 as much as possible.
  • the small diameter portion 62 of the core material 6 has a small diameter columnar portion 621, and the small diameter columnar portion 621 is arranged in the tip protruding portion 41. As a result, it is possible to prevent the core material 6 from being exposed while ensuring the thermal conductivity of the tip protruding portion 41 as much as possible. As a result, it is possible to obtain the spark plug 1 which can easily prevent the core material 6 from being exposed while ensuring the heat dissipation of the center electrode 4 as a whole.
  • the plug cover 5 has an axial injection hole 511.
  • the airflow A toward the proximal end side as described above is likely to occur in the discharge gap G.
  • the discharge end S1 tends to move to the outer peripheral surface of the portion of the center electrode 4 where the core material 6 is present.
  • the distance d1 in the axial direction Z between the discharge gap G and the axial injection hole 511 is shorter than the distance d2 in the axial direction Z between the discharge gap G and the tip of the insulating insulator 3.
  • the airflow A flows into the sub-combustion chamber 50 from the axial injection hole 511, an airflow toward the proximal end side is likely to occur in the discharge gap G as well. Therefore, by adopting the structure of the center electrode 4 described above, the life of the spark plug 1 can be effectively extended.
  • a discharge gap G is formed between the center electrode 4 and the plug cover 5.
  • the ground electrode 7 disclosed in the first embodiment is not provided.
  • a part of the inner peripheral edge of the axial injection hole 511 in the plug cover 5 faces the tip of the center electrode 4.
  • a discharge gap G is formed between a part of the inner peripheral edge of the axial injection hole 511 and the tip of the center electrode 4. Therefore, a part of the inner peripheral edge of the axial injection hole 511 in the plug cover 5 serves as a ground electrode.
  • the discharge gap G is formed between the tip of the center electrode 4 and the edge 513 on the side of the auxiliary combustion chamber 50 in the axial injection hole 511. Then, in the present embodiment, as shown in FIG. 6, the discharge gap G is formed in a circumferential shape over the entire circumference around the center electrode 4.
  • a discharge S is formed in the discharge gap G as shown in FIG. 7. Then, when the airflow A flows into the sub-combustion chamber 50 from the axial injection hole 511, the discharge S extends toward the proximal end side due to the airflow A, as shown in FIG. At this time, the discharge end S1 on the center electrode 4 side moves to the base end side along the side surface of the center electrode 4.
  • the movement of the discharge end S1 along the outer peripheral surface of the center electrode 4 can be performed at any position in the circumferential direction. Can occur.
  • the formation position of the discharge S can be controlled by adjusting the positional relationship between the center electrode 4 and the axial injection hole 511.
  • the structure of the center electrode 4 such as the arrangement of the core material 6 is the same as that of the first embodiment. Others are the same as in the first embodiment.
  • the same codes as those used in the above-described embodiments represent the same components and the like as those in the above-mentioned embodiments, unless otherwise specified.
  • the ground electrode 7 is projected from the housing 2 inward in the radial direction. That is, in the spark plug 1 of this embodiment, the ground electrode 7 is joined to the housing 2.
  • a discharge gap G is formed between the protruding end of the ground electrode 7 and the outer peripheral surface of the center electrode 4. Further, in the present embodiment, the discharge gap G is formed on the proximal end side of the housing 2 with respect to the distal end end.
  • the tip of the center electrode 4 is also arranged closer to the base end than the tip of the housing 2.
  • this embodiment is a form in which the ground electrode 7 is joined so as to project from the plug cover 5 toward the proximal end side.
  • the ground electrode 7 is joined to the inner peripheral surface of the axial injection hole 511.
  • the ground electrode 7 is erected along the axial direction Z. Further, the ground electrode 7 projects into the sub-combustion chamber 50.
  • the protruding end of the ground electrode 7 is located closer to the base end side in the axial direction Z than the tip end of the center electrode 4.
  • the ground electrode 7 forms a discharge gap G with the center electrode 4 on the side surface on the axial injection hole 511 side.
  • the axial injection hole 511 has a main hole portion 514 formed substantially coaxially with the center electrode 4 and an extension extending radially outward from the main hole portion 514. It has a hole 515 and a hole 515. A part of the ground electrode 7 is arranged in the extended hole portion 515. A ground electrode 7 is joined to the inner peripheral surface of the extension hole portion 515. Others are the same as in the first embodiment.
  • the airflow flowing from the axial injection hole 511 into the sub-combustion chamber 50 is likely to be guided along the side surface of the ground electrode 7 toward the base end side of the discharge gap G. Therefore, in the compression stroke or the like, the discharge is easily stretched, and the ignitability can be improved. Then, the discharge end is more likely to move toward the base end side of the tip protruding portion 41.
  • the exposure of the core material 6 can be suppressed more effectively by arranging the small diameter portion 62 of the core material 6 of the center electrode 4 on the tip protruding portion 41. In addition, it has the same effect as that of the first embodiment.
  • this form is a form of a spark plug 1 having a protruding tubular body 52 protruding from the tip of the plug cover 5 toward the auxiliary combustion chamber 50 side. Then, the protruding cylindrical body 52 becomes the ground electrode 7.
  • the protruding cylindrical body 52 has a substantially conical shape in which the diameter is reduced from the tip end portion toward the base end side in the axial direction Z, and penetrates in the Z direction.
  • the through space inside the protruding tubular body 52 becomes the axial injection hole 511.
  • a discharge gap G is formed between the base end of the protruding tubular body 52 and the tip end of the center electrode 4.
  • the discharge gap G is formed over the entire circumference of the tip portion of the center electrode 4.
  • the structure of the center electrode 4 is the same as that of the first embodiment. Others are the same as in the first embodiment. This embodiment also has the same effect as that of the first embodiment.
  • the small-diameter portion 62 in the core material 6 of the center electrode 4 has a first small-diameter columnar portion 621a and a second small-diameter columnar portion 621b having different diameters from each other.
  • the diameter of the second small-diameter columnar portion 621b is smaller than that of the first small-diameter columnar portion 621a.
  • the second small-diameter columnar portion 621b is continuously formed on the tip end side of the first small-diameter columnar portion 621a.
  • the first small-diameter columnar portion 621a has a smaller diameter than the large-diameter portion 61.
  • the second small-diameter columnar portion 621b is arranged at the second portion 412 of the tip protruding portion 41 of the center electrode 4. That is, a second small-diameter columnar portion 621b having a diameter smaller than that of the first small-diameter columnar portion 621a is arranged inside the second portion 412, which is a portion of the tip protruding portion 41 having a diameter smaller than that of the first portion 411. ing. Others are the same as in the first embodiment.
  • the core material 6 can be arranged as close to the tip of the center electrode 4 as possible while suppressing the exposure of the core material 6.
  • the heat dissipation of the center electrode 4 can be improved, and pre-ignition can be more easily prevented.
  • the second small-diameter columnar portion 621b having a smaller diameter is arranged inside the second small-diameter columnar portion 412 having a smaller diameter than the first portion 411, the base material 42 on the outer peripheral side of the second small-diameter columnar portion 621b The thickness can also be secured. Therefore, it is possible to suppress the exposure of the small-diameter columnar portion 621 due to the consumption of the base material 42. In addition, it has the same effect as that of the first embodiment.
  • the small diameter portion 62 has two small diameter columnar portions 621a and 621b, but the small diameter portion 62 may be provided with three or more small diameter columnar portions having different diameters from each other. In this case, these small-diameter columnar portions are arranged so that the diameter becomes smaller toward the smaller-diameter columnar portion on the tip side.
  • this embodiment is a form in which the precious metal chips 43 and 73 are joined to the portions of the center electrode 4 and the ground electrode 7 facing the discharge gap G.
  • the noble metal chips 43 and 73 can be made of, for example, a noble metal such as iridium or platinum or an alloy thereof. Others are the same as in the first embodiment.
  • the expansion of the discharge gap G can be suppressed to extend the life of the spark plug 1.
  • it has the same effect as that of the first embodiment.
  • a noble metal chip may be bonded to only one of the center electrode 4 and the ground electrode 7. Further, in the other embodiment described above, the precious metal chip may be similarly bonded to at least one of the center electrode 4 and the ground electrode 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
PCT/JP2021/015304 2020-04-24 2021-04-13 内燃機関用のスパークプラグ Ceased WO2021215301A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112021002565.1T DE112021002565T5 (de) 2020-04-24 2021-04-13 Zündkerze für eine Maschine mit interner Verbrennung
US17/970,092 US11695256B2 (en) 2020-04-24 2022-10-20 Spark plug for internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020077015A JP7392563B2 (ja) 2020-04-24 2020-04-24 内燃機関用のスパークプラグ
JP2020-077015 2020-04-24

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/970,092 Continuation US11695256B2 (en) 2020-04-24 2022-10-20 Spark plug for internal combustion engine

Publications (1)

Publication Number Publication Date
WO2021215301A1 true WO2021215301A1 (ja) 2021-10-28

Family

ID=78269243

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/015304 Ceased WO2021215301A1 (ja) 2020-04-24 2021-04-13 内燃機関用のスパークプラグ

Country Status (4)

Country Link
US (1) US11695256B2 (enExample)
JP (1) JP7392563B2 (enExample)
DE (1) DE112021002565T5 (enExample)
WO (1) WO2021215301A1 (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7564065B2 (ja) * 2021-07-09 2024-10-08 日本特殊陶業株式会社 スパークプラグ
JP7503526B2 (ja) * 2021-07-09 2024-06-20 日本特殊陶業株式会社 スパークプラグ
JP7609053B2 (ja) * 2021-12-22 2025-01-07 株式会社デンソー 内燃機関用のスパークプラグ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04366579A (ja) * 1991-06-13 1992-12-18 Ngk Spark Plug Co Ltd スパークプラグ
JPH0737672A (ja) * 1993-07-22 1995-02-07 Ngk Spark Plug Co Ltd 内燃機関用スパークプラグ
JPH11224763A (ja) * 1997-10-24 1999-08-17 Jun Sato 燃料点火システム用のサブ燃焼室を備えたスパークプラグ
DE10144976A1 (de) * 2001-09-12 2003-04-03 Beru Ag Zündkerze mit Mittelelektrode und Vorkammer
JP2014502692A (ja) * 2010-12-31 2014-02-03 プロメテウス アプライド テクノロジーズ，エルエルシー プレチャンバー点火装置
JP2015056258A (ja) * 2013-09-11 2015-03-23 日本特殊陶業株式会社 スパークプラグの製造方法、および、スパークプラグ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010004851B4 (de) 2009-12-18 2014-05-28 Federal-Mogul Ignition Gmbh Vorkammer-Zündkerze für eine mit Gas betriebene Brennkraftmaschine
DE102015117113B4 (de) 2015-10-07 2017-06-01 Federal-Mogul Ignition Gmbh Vorkammerzündkerze für eine mit Gas betriebene Brennkraftmaschine
US10938187B1 (en) * 2020-05-08 2021-03-02 Caterpillar Inc. Prechamber sparkplug having electrodes located for inhibiting flame kernel quenching

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04366579A (ja) * 1991-06-13 1992-12-18 Ngk Spark Plug Co Ltd スパークプラグ
JPH0737672A (ja) * 1993-07-22 1995-02-07 Ngk Spark Plug Co Ltd 内燃機関用スパークプラグ
JPH11224763A (ja) * 1997-10-24 1999-08-17 Jun Sato 燃料点火システム用のサブ燃焼室を備えたスパークプラグ
DE10144976A1 (de) * 2001-09-12 2003-04-03 Beru Ag Zündkerze mit Mittelelektrode und Vorkammer
JP2014502692A (ja) * 2010-12-31 2014-02-03 プロメテウス アプライド テクノロジーズ，エルエルシー プレチャンバー点火装置
JP2015056258A (ja) * 2013-09-11 2015-03-23 日本特殊陶業株式会社 スパークプラグの製造方法、および、スパークプラグ

Also Published As

Publication number Publication date
JP7392563B2 (ja) 2023-12-06
JP2021174659A (ja) 2021-11-01
US11695256B2 (en) 2023-07-04
DE112021002565T5 (de) 2023-03-02
US20230038174A1 (en) 2023-02-09

Similar Documents

Publication Publication Date Title
US8912716B2 (en) Copper core combustion cup for pre-chamber spark plug
US10868408B2 (en) Spark plug
US11695256B2 (en) Spark plug for internal combustion engine
JP4965692B2 (ja) スパークプラグ
JP6016721B2 (ja) スパークプラグ
JPWO2021111719A1 (ja) スパークプラグ
JP6347712B2 (ja) スパークプラグ
JP5271420B2 (ja) スパークプラグ
EP2922158A1 (en) Spark plug and ignition system
JP7186044B2 (ja) 内燃機関用のスパークプラグ
JP6548610B2 (ja) プラズマジェットプラグ
JP4680792B2 (ja) スパークプラグ
JP2008287917A (ja) 内燃機関用のスパークプラグ
JP2012164644A (ja) スパークプラグ
WO2013099117A1 (ja) 点火プラグ
US9231378B2 (en) Spark plug for internal combustion engine
JP2007134319A (ja) スパークプラグ
JP2009158343A (ja) スパークプラグ
JP7300427B2 (ja) スパークプラグ
JP4562030B2 (ja) スパークプラグ
JP6318796B2 (ja) スパークプラグ
US11476644B2 (en) Spark plug
US20150108892A1 (en) Spark plug for internal combustion engine
JP6248601B2 (ja) 内燃機関用スパークプラグ
US10320158B2 (en) Spark plug

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21791613

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 21791613

Country of ref document: EP

Kind code of ref document: A1