WO2011065596A1 - Bougie d'allumage et procédé de soudage de pointe d'électrode de bougie d'allumage pour sa fabrication - Google Patents

Bougie d'allumage et procédé de soudage de pointe d'électrode de bougie d'allumage pour sa fabrication Download PDF

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Publication number
WO2011065596A1
WO2011065596A1 PCT/KR2009/006954 KR2009006954W WO2011065596A1 WO 2011065596 A1 WO2011065596 A1 WO 2011065596A1 KR 2009006954 W KR2009006954 W KR 2009006954W WO 2011065596 A1 WO2011065596 A1 WO 2011065596A1
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WO
WIPO (PCT)
Prior art keywords
electrode
electrode tip
welding
spark plug
hollow
Prior art date
Application number
PCT/KR2009/006954
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English (en)
Korean (ko)
Inventor
김현중
신병헌
조춘식
송석기
Original Assignee
주식회사 유라테크
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Application filed by 주식회사 유라테크 filed Critical 주식회사 유라테크
Priority to PCT/KR2009/006954 priority Critical patent/WO2011065596A1/fr
Publication of WO2011065596A1 publication Critical patent/WO2011065596A1/fr

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    • 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
    • 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

  • the present invention relates to an ignition plug for an internal combustion engine, and more particularly, to a spark plug having an electrode tip and a welding method between the electrode tip and the electrode.
  • a spark plug is a device mounted on a cylinder head of an internal combustion engine to ignite an electric flame on a gas mixture of fuel and air supplied into a combustion chamber.
  • the spark plug is provided with a housing mounted to the cylinder head of the engine, disposed inside the housing through a center and wrapped in an insulator, protruding from the end of the housing, and one end of which is connected to the ignition coil so that a high voltage current is provided. It is composed of a center electrode is guided, and a ground electrode fixed to one side of the housing and disposed with a predetermined gap with the center electrode.
  • the center electrode and the ground electrode are generally composed of a copper compound having excellent thermal conductivity or nickel of high purity.
  • the insulator is wrapped around the outer circumferential surface of the center electrode in order to prevent high voltage from being discharged to portions other than generating sparks, and is formed of a ceramic material having excellent heat resistance insulation and the like.
  • a center electrode tip formed of expensive precious metal is fused by welding, and the ground electrode
  • the ground electrode tip which is formed of an expensive precious metal, is also welded to the end of the electrode.
  • 1 to 3 are process flowcharts illustrating a method for mounting an electrode tip to an electrode according to the prior art.
  • the pressing portion 130 having a flat plate shape is pressed down on the upper surface of the electrode tip 120. Then, the upper surface of the electrode tip 120 is molded into a flat shape.
  • secondary spot welding is performed to fix the gap between the electrode tip 120 and the electrode 110.
  • laser welding has recently been used.
  • the electrode portion is oxidized during welding, which causes the humping phenomenon.
  • the present invention has been made to solve the above problems, it is possible to suppress the generation of pores in the weld, to improve the weldability, and to provide a spark plug electrode tip welding method for manufacturing the spark plug that can reduce the cost. For that purpose.
  • the center electrode An insulator coupled to surround the center electrode; A metal fitting coupled to surround the insulator; A ground electrode having one end coupled to the bracket and provided with the other end facing the center electrode; And an electrode tip fixed to at least one of the center electrode and the ground electrode facing each other, wherein the electrode tip has a pipe shape.
  • the electrode tip is formed of a precious metal material.
  • the present invention provides a spark plug electrode tip welding method as another field.
  • the spark plug electrode tip welding method includes the steps of: providing a pipe-shaped electrode tip having a hollow formed therein and an electrode having a molten portion protruding from the hollow; An assembly step of fitting the hollow of the electrode tip to the melting part; And a first welding step of welding the electrode tip and the electrode by irradiating a beam to the melting part through the hollow.
  • the second welding step of performing a beam welding along the outer circumferential surface of the electrode tip and the electrode preferably further comprises a.
  • the first welding step is effective to weld using a laser beam.
  • the second welding step is preferably welded using a laser beam.
  • the molten portion has a cone shape.
  • the melted portion is formed in the electrode can accurately position the electrode tip in the center of the electrode.
  • the melt portion is formed in a horn shape, there is an advantage that the electrode tip can be more easily assembled to the melt portion.
  • the electrode tip is formed in a pipe shape having a hollow, it is possible to reduce the amount of precious metals, to increase the explosion efficiency inside the engine, and to reduce the surface contact area with the electrode, thereby reducing the generation of pores in the welded part. It can be further suppressed.
  • 1 to 3 is a process flowchart showing a method for mounting an electrode tip on an electrode according to the prior art
  • FIG. 6 is a partially broken cross-sectional view showing one end of the spark plug manufactured using the electrode tip welding method of the embodiment of the present invention.
  • FIG. 7 is an enlarged cross-sectional view of a portion of the center electrode and the ground electrode of FIG. 6; FIG.
  • FIG. 6 is a partially broken cross-sectional view showing one end of the spark plug manufactured using the electrode tip welding method of the embodiment of the present invention.
  • the spark plug includes a center electrode 3, an insulator 2 disposed outside the center electrode 3 and coupled to surround the center electrode 3, and an outside of the insulator 2. It includes a bracket (1) disposed in and coupled to surround the insulator (2), one end is coupled to the bracket (1), the other end is provided with a ground electrode (4) facing the center electrode (3).
  • the electrode tips 31 and 32 are fixed to at least one of the positions where the center electrode 3 and the ground electrode 4 face each other.
  • the electrode tips 31 and 32 are formed of a precious metal material.
  • the noble metal refers to a metal chemically much larger than ionization energy of hydrogen and is not oxidized by an acid and an oxidizing agent, and includes gold, platinum, ruthenium, rhodium, osmium and iridium.
  • the precious metal electrode tip 31 may be used with various kinds of precious metals such as iridium (Ir) and platinum (Pt).
  • FIG. 7 is an enlarged cross-sectional view of a portion of the center electrode and the ground electrode of FIG. 6.
  • the main body 3a of the center electrode 3 is tapered at its end, and its end face is formed flat.
  • the electrode tip 31 is formed in the shape of a hollow pipe and is disposed on a flat end surface, and laser beam bonding, electron beam bonding or other suitable bonding technique is applied to the outer surface of the joint surface to form the junction line W.
  • the electrode tip 31 is firmly fixed to the end surface of the center electrode (3).
  • one of the two opposing electrode tips 31 and 32 may be omitted.
  • a spark discharge gap is formed between one of the electrode tips 31, 32 and the ground electrode 4 (or the center electrode 3).
  • the electrode tip 31 may be formed in various shapes such as a circular pipe and a square pipe.
  • the electrode tip 31 is formed in the shape of a pipe in which the hollow is formed, thereby forming a plurality of edges e1, e2, e3, and e4.
  • edges e1, e2, e3, and e4 In general, since sparks are more likely to occur at edges than planes, a large number of edges may generate a large number of sparks at the same time, thereby increasing explosion or combustion efficiency in the engine.
  • FIG 8 to 12 are views sequentially showing the spark plug noble metal electrode tip welding method of the present invention.
  • the spark plug electrode tip welding method includes an electrode having a pipe-shaped electrode tip 31 having a hollow 311 formed therein and a melting part 33 protruding from the hollow 311. 3) and the assembling step (FIG. 10) of fitting the hollow 311 of the electrode tip 31 to the melting part 33, and the hollow 311 It includes a first welding step (FIG. 11) for welding the electrode tip and the electrode by irradiating the beam 81 to the melting portion 33 through.
  • the electrode tip 31 may be formed in a pipe shape, and may be formed in a pipe shape having various shapes such as a circle, a rectangle, and a triangle. However, due to the ease of manufacture, the circle is most preferred.
  • the precious metal electrode tip 31 is formed around 0.7mm in diameter, and the hollow 311 is preferably formed in 0.3mm or less.
  • the hollow 311 of 0.3 mm or less may be formed by electric discharge machining or laser machining.
  • the melting part 33 is formed to a size into which the hollow 311 may be fitted.
  • the melting part 33 may be formed in various shapes such as a pillar or a horn body. However, when formed as a cone (cone) can be assembled much easier when assembling the electrode tip (31). Cones may be formed in various shapes such as cones, triangular pyramids, and the like. As described above, since the melting part 33 is provided, the electrode tip 31 can be accurately assembled to the electrode 3.
  • the beam 81 is melted through the hollow 311 to melt the melting part 33, thereby joining the electrode tip 31 and the electrode 3.
  • the beam 81 may be a laser beam or the like. As such, since the melting part 33 is melted to weld the electrode tip 31 and the electrode 3, the weldability is good.
  • a second welding step for beam welding along the outer circumferential surface where the electrode tip 31 and the electrode 3 meet. That is, as shown in FIG. 12, the beam 82 is welded along the outer circumferential line of the electrode tip 31 and the electrode 3.
  • the beam welding laser beam welding or the like may be used. Therefore, the electrode tip 31 and the electrode 3 can be more firmly combined.
  • laser welding is repeatedly performed on the resistance welded portion, so that humping may occur due to oxidation or the like. 2, there is a difference in the welded area in the welding step, it is possible to prevent duplicate welding. Therefore, there is an effect that the weldability is much increased.
  • the melted portion is formed in the electrode can accurately position the electrode tip in the center of the electrode.
  • the melt portion is formed in a horn shape, there is an advantage that the electrode tip can be more easily assembled to the melt portion.

Abstract

La présente invention porte sur une bougie d'allumage et sur un procédé de soudage d'une pointe d'électrode de bougie d'allumage pour sa fabrication. La bougie d'allumage comporte : une électrode centrale ; un isolateur qui est combiné pour recouvrir l'électrode centrale ; un élément métallique qui est combiné pour recouvrir l'isolateur ; une électrode de masse qui est configurée de telle manière qu'une extrémité est combinée à l'élément métallique et que l'autre extrémité fait face à l'électrode centrale, et une pointe d'électrode qui est fixée à au moins une des surfaces se faisant face de l'électrode de masse et de l'électrode centrale. La pointe d'électrode est en forme de tube. Le procédé de soudage de la pointe d'électrode de bougie d'allumage comporte les étapes suivantes : la préparation de la pointe d'électrode de forme tubulaire qui présente un creux, et d'une électrode qui est équipée d'une zone de fusion saillante destinée à être introduite dans le creux ; l'assemblage de la zone de fusion qui est introduite dans le creux de la pointe d'électrode ; un premier soudage de la pointe d'électrode et de l'électrode par l'exposition de la zone de fusion à des faisceaux à travers le creux. Ainsi, l'invention réduit les coûts en réduisant la quantité de métaux précieux à prix élevé requise dans la formation de pointes d'électrode, et augmente l'efficacité d'explosion dans le moteur. En outre, l'invention permet d'augmenter la soudabilité.
PCT/KR2009/006954 2009-11-25 2009-11-25 Bougie d'allumage et procédé de soudage de pointe d'électrode de bougie d'allumage pour sa fabrication WO2011065596A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/006954 WO2011065596A1 (fr) 2009-11-25 2009-11-25 Bougie d'allumage et procédé de soudage de pointe d'électrode de bougie d'allumage pour sa fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2009/006954 WO2011065596A1 (fr) 2009-11-25 2009-11-25 Bougie d'allumage et procédé de soudage de pointe d'électrode de bougie d'allumage pour sa fabrication

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WO2011065596A1 true WO2011065596A1 (fr) 2011-06-03

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990007537A (ko) * 1998-10-01 1999-01-25 엄병윤 점화플러그용 전극팁 및 상기 전극팁을 점화플러그의 전극에 접합하는 방법
US6204594B1 (en) * 1998-06-12 2001-03-20 Cooper Automotive Products, Inc. Spark plug with pressure sensor
JP2005158323A (ja) * 2003-11-21 2005-06-16 Ngk Spark Plug Co Ltd スパークプラグの製造方法
KR20090041748A (ko) * 2007-10-24 2009-04-29 주식회사 유라테크 점화 플러그의 전극팁 장착방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6204594B1 (en) * 1998-06-12 2001-03-20 Cooper Automotive Products, Inc. Spark plug with pressure sensor
KR19990007537A (ko) * 1998-10-01 1999-01-25 엄병윤 점화플러그용 전극팁 및 상기 전극팁을 점화플러그의 전극에 접합하는 방법
JP2005158323A (ja) * 2003-11-21 2005-06-16 Ngk Spark Plug Co Ltd スパークプラグの製造方法
KR20090041748A (ko) * 2007-10-24 2009-04-29 주식회사 유라테크 점화 플러그의 전극팁 장착방법

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