WO2016026597A1 - Bougie d'allumage comprenant une électrode à masses multiples - Google Patents

Bougie d'allumage comprenant une électrode à masses multiples Download PDF

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Publication number
WO2016026597A1
WO2016026597A1 PCT/EP2015/063703 EP2015063703W WO2016026597A1 WO 2016026597 A1 WO2016026597 A1 WO 2016026597A1 EP 2015063703 W EP2015063703 W EP 2015063703W WO 2016026597 A1 WO2016026597 A1 WO 2016026597A1
Authority
WO
WIPO (PCT)
Prior art keywords
spark plug
housing
center electrode
longitudinal axis
wear
Prior art date
Application number
PCT/EP2015/063703
Other languages
German (de)
English (en)
Inventor
Detlef Hartmann
Andreas Benz
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2016026597A1 publication Critical patent/WO2016026597A1/fr

Links

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
    • H01T13/46—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
    • 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 invention relates to a spark plug according to the preamble of the independent
  • spark plugs In the spark plug development is constantly working to increase the life of the spark plug. In today's spark plugs, both for use in the automotive sector as well as for use in stationary gas engines, the term could be increased by the use of precious metal wear surfaces. In the recent past, further increases in spark plug life have been achieved by increasing the precious metal content in the spark plug. In this case, for the automotive applications primarily spark plugs are used with multi-ground electrodes, compared to spark plugs with a
  • Ground electrode provide a larger electrode wear volume.
  • Ground electrode and if necessary. the center electrode increases to increase the amount of the noble metal. Due to the high or increasing proportion of precious metal in the spark plug and the cost of materials in the production of the spark plug increase.
  • the spark plug according to the invention with the characterizing feature of the independent claim has the advantage that an increase in the efficiency and the duration of the spark plug according to the invention is achieved.
  • the invention provides that the spark gap is formed substantially parallel to the longitudinal axis of the spark plug and spaced from the longitudinal axis of the spark plug, there is the advantage that the spark gap for the mixture to be ignited, such as a fuel mixture, is more accessible and thus the Inflammation of the mixture is favored. This improves the spark gap for the mixture to be ignited, such as a fuel mixture, is more accessible and thus the Inflammation of the mixture is favored. This improves the
  • the spark plug according to the invention can be operated under the spark plug less abrasive conditions and thereby achieved nevertheless comparable results in the operational reliability as a spark plug of the state of the art, which is operated under more extreme conditions and thus wears faster.
  • the spark plug comprises a housing, an insulator arranged in the housing with an axial bore and a center electrode arranged in the axial bore of the insulator.
  • the spark plug has a longitudinal axis.
  • the longitudinal axis of the spark plug extends from the combustion chamber end of the spark plug to the combustion chamber end remote from the spark plug.
  • the longitudinal axis of the spark plug corresponds to the axis about which the spark plug would rotate when screwed into, for example, an engine block.
  • the spark plug has at least one spark gap, which is in the range of
  • Ignition gap forms, wherein the ignition gap between the center electrode and the housing is arranged.
  • the spark gap is the shortest distance between the center electrode and the housing in the region of the ignition gap.
  • the spark gap is formed parallel to the longitudinal axis of the spark plug.
  • the spark gap is formed spaced from the longitudinal axis, i. the spark gap has a radial distance to the longitudinal axis of the spark plug.
  • substantially parallel it is meant that the spark gap can have some deviation from the parallel orientation to the longitudinal axis due to production or operational reasons.
  • a spark gap which has an angle of up to 10 °, in particular up to 5 ° or up to 2 °, to the longitudinal axis of the spark plug, considered as substantially parallel to the longitudinal axis.
  • center electrode refers to the electrode, which is arranged at least in some areas within the insulator and whose electrical contacting takes place via the connection bolt arranged at the end remote from the combustion chamber. Further advantageous embodiments are the subject of the dependent claims.
  • of the housing is. Additionally or alternatively, the distance of the spark gap to the longitudinal axis is less than or equal to half the outer diameter D A of the housing.
  • the center electrode at its
  • the end portion of the combustion chamber has a portion extending radially outwards from the longitudinal axis of the spark plug toward the housing, also abbreviated to "radial portion.”
  • the radial portion may be substantially perpendicular to the longitudinal axis of the spark plug, with the radial portion of FIG
  • the radial section can have a deviation of up to 35 °, in particular up to 20 °, or in particular up to 10 °, from the vertical arrangement of the section
  • the radial section can be straight in itself.
  • the radial section can also have a curvature, as a result of which the radial section can be arranged maximally in regions perpendicular to the longitudinal axis of the spark plug.
  • a spark gap is formed between the housing and the region of the radial section or the center electrode which is closest to the housing. In the area of the ignition gap, the spark gap is formed.
  • the center electrode has the radial portion and a base to which the radial portion is fixed.
  • the radial section is cohesively and / or non-positively connected to the base of the
  • Center electrode connected may be connected.
  • the radial portion and the base of the center electrode may be formed by conventional welding techniques, such as
  • the radial section consists of a nickel alloy.
  • the radial portion may be made of the same nickel alloy as the base of the center electrode.
  • At least one wear surface may be arranged on a combustion chamber-side end face of the housing, in particular, the
  • Wear surface arranged directly on the front side of the housing. It is also conceivable that the wear surface is arranged partially or completely, for example in a recess provided for this purpose in the end face of the housing.
  • the wear surface or the front side of the housing take over the function of the ground electrode of a conventional spark plug.
  • At least one wear surface may be arranged on the center electrode.
  • the at least one wear surface is disposed on the radial portion of the center electrode.
  • the radial section at its end remote from the longitudinal axis, in particular on the housing-facing side of the end of the radial section, the wear surface.
  • the spark gap or the spark gap is formed between the center electrode or its radial section and the housing or the front side of the housing, wherein the center electrode or its radial section and / or the housing or its end face have at least one wear surface.
  • the wear surfaces are, for example, by means of laser welding to the housing or its front side and / or the
  • the surfaces defining the spark gap have a pitch in the range of 0.2 mm to 2.5 mm.
  • the ideal spacing of the surfaces for the intended use can be adjusted. If necessary, the distance can be readjusted during the runtime of the spark plug, or during routine maintenance work on the stationary gas engine.
  • the wear surface arranged on the center electrode or on its radial section is arranged opposite the wear surfaces arranged on the housing or on the front side of the housing. That In a projection of a wear surface along the longitudinal axis of the spark plug to the other wear surface, the projection of a wear surface would cover the other wear surface at least partially, preferably completely cover. For example, one wearing surface has a larger end face than the other
  • Wear surface for example, the end face of a wear surface at least by a factor of 1.2, in particular by a factor of 1.5, greater than the end face of the opposite arranged wear surface. This will be the one
  • Tension can be reduced. At one edge, a larger gradient of the electric field is formed than at one surface, and therefore even at a lower voltage, the electrons can be released from the surface of the wear surface and generate a spark. As a result, the material and the spark plug is less stressed and extends the life of the spark plug.
  • the diameter of the wear surface arranged on the center electrode or on the radial section of the center electrode is greater than the diameter of the wear surface arranged on the housing or on the housing end side by at least a factor of 1.2, in particular by a factor of 1.5.
  • the wear surfaces typically comprise a noble metal or a noble metal alloy, wherein the wear surfaces may consist of the same or different metals or alloys.
  • the main constituent of the alloy is platinum (Pt), iridium (Ir), rhodium (Rh) and / or an alloy of the elements.
  • the wear surfaces may be round, oval or polygonal, e.g. square,
  • the width of the wear surfaces is smaller than the width of the housing edge or the width of the front side of the housing.
  • the width of the wear surfaces or the diameter in a round cross-sectional area of the wear surfaces in the range of 1 mm to 4 mm.
  • the wear surface is wider and / or longer than high.
  • the height of the wear surfaces is measured along a direction parallel to the spark plug longitudinal axis direction.
  • the height of the wear surfaces is in the range of 0.4 mm to 1.5 mm.
  • the length of the wear surfaces is measured along the circumference of the housing.
  • the width of the wear surfaces is correspondingly along a radial direction perpendicular to the longitudinal axis of the spark plug.
  • the wear surfaces arranged on the center electrode or on its radial section can have the same or at least similar geometries and / or materials as those on the housing or on its front side
  • spark plug in a further development of the spark plug according to the invention, at least two, in particular three or four or five, on the housing or on its front side,
  • Wear surfaces be arranged.
  • the wear surfaces are distributed uniformly over the circumference of the housing or the combustion chamber-side end face of the housing.
  • the wear surfaces each between each other a arc distance of approximately n * (D A -D
  • Wear surfaces and D A and Di are the outer diameter and the inner diameter of the housing.
  • the distance may be subject to certain fluctuations due to production, which are included by the use of the term approx.
  • the radial portion of the center electrode is formed with one arm or more arm, wherein the or the arms extend from the longitudinal axis of the spark plug radially outward in the direction of the housing edge.
  • the multi-arm radial section has m arms. Ideally, m is equal to n, where n is the number of wear surfaces arranged on the housing or its front side.
  • the radial section is two-armed or three-armed or five-armed
  • two, in particular adjacent, arms of the radial section enclose an angle of approximately 360 ° / m.
  • the angle may be subject to certain fluctuations due to production, which are included by the use of the term approx.
  • the multi-arm radial section preferably has a wear surface at each of its ends facing away from the longitudinal axis of each arm, in particular on the sides of the arms facing the housing.
  • the radial portion with its arms may be formed in one piece or several pieces. In an even number of arms, the arms may be formed in pairs in one piece, for example. In a multi-piece embodiment of the radial portion with its arms, the individual components of the radial portion are connected to each other, for example by welding.
  • the arms are typically longer than half the inside diameter D
  • the radial section of the center electrode is formed as a disk or as a wheel.
  • the wheel may have, for example, I spokes, wherein ideally I corresponds to the number of wear surfaces arranged on the housing or its front side.
  • the spark plug according to the invention and its developments can be stationary
  • Figure 1 shows an example of a spark plug according to the invention with a single-arm center electrode in a half-cut side view.
  • Figure 2 shows a second example of a spark plug according to the invention with a two-armed center electrode in a half-cut side view
  • Figure 3 shows the example according to Figure 2 in a plan view
  • Figure 4 shows a third example of a spark plug according to the invention with a three-arm center electrode in a plan view
  • Figure 1 shows a schematic representation of the combustion chamber end of the
  • the spark plug according to the invention has a housing 2 with a therein arranged insulator 3 and arranged in the insulator 3 center electrode 4.
  • the spark plug 1 has a longitudinal axis XX which extends from the combustion chamber end of the spark plug 1 to the combustion chamber facing away from the end of the spark plug 1.
  • the combustion chamber-side end of the center electrode 4 protrudes from the combustion chamber end of the insulator 3 out.
  • the combustion chamber-side end of the insulator 3 can be flush with the
  • the housing 2 has at its combustion-chamber-side end an inner diameter D
  • a wear surface 8 may be arranged.
  • the wear surface 8 consists of a noble metal or a noble metal-containing alloy.
  • Wear surface 8 platinum (Pt), iridium (Ir) and / or rhodium (Rh) or an alloy with at least two of these elements used.
  • the wear surface 8 may be a round, oval or polygonal, z. B. quadrangular, cross-sectional area. The width of the
  • Wear surface 8 is smaller than the width of the housing edge or the end face 10 of the housing 2. For example, the width of the wear surface 8 or the
  • Diameter at a circular cross-sectional area of the wear surface 8 in the range of 1 mm to 4 mm.
  • the wear surface 8 is wider and / or longer than high. The height of the wear surface 8 is thereby along a parallel direction of the
  • Spark plug longitudinal axis X-X measured. Typically, the height of the
  • Wear surface in the range of 0.4 mm to 1.5 mm.
  • the length of wear surface 8 is measured along the circumference of the housing.
  • the width of the wear surface 8 is given correspondingly along a radial direction perpendicular to the longitudinal axis X-X.
  • a radial section 6 is arranged at the combustion chamber end of the center electrode 4. The radial portion 6 extends from the
  • the radially outwardly extending portion of the radial portion 6 is also referred to as arm 9.
  • the radial portion 6 is arranged substantially perpendicular to the longitudinal axis XX, with "essentially" manufacturing-related uncertainties and resulting deviations and / or aging-related deviations and / or operational deviations from the radial arrangement are included It is also conceivable that the radial portion 6 has a curvature, whereby the portion 6 is arranged at most partially perpendicular to the longitudinal axis XX.
  • the radial section 6 is connected in a material-locking and / or non-positively connected manner to a base 11 of the center electrode 4.
  • the radial portion 6 and the base 11 of the center electrode 4 may be formed by the usual welding techniques, such as
  • the radial section 6 is made of a nickel alloy.
  • the radial portion 6 may be made of the same nickel alloy as the base 11 of the center electrode 4.
  • the radial section 6 At its side facing away from the longitudinal axis, the radial section 6 has a
  • the wear surface 7 of the arranged on the end face 10 of the housing wear surface 8 is arranged opposite, so that the spark between the wear surfaces 7, 8 must travel as short a path as possible.
  • the gap located between the wear surfaces 7, 8 is called spark gap 5.
  • the wear surface 7 arranged on the section 6 can have the same or at least similar geometries and / or materials as the wear surface 8 arranged on the end face 10 of the housing 2, see also those described above
  • the two wear surfaces 7, 8 can be the same
  • the wear surfaces 7, 8 consist of the same material or different materials.
  • FIG. 2 shows a second embodiment of the spark plug according to the invention.
  • the embodiment of Figure 2 differs from the embodiment of Figure 1 in that the spark plug two Zündspalte 5 and thus two
  • the radial portion 6 has a length of at least the
  • the radial section 6 has two arms 9. As can be seen in FIG. 3, the arms 9 enclose an angle of approximately 180 °, whereby the "approx.”
  • the radial portion 6 is formed integrally with its two arms.
  • the radial portion is formed in several pieces.
  • each arm 9 may be formed in one piece and the radial portion 6 results from a frictional and / or
  • FIG. 4 shows a third exemplary embodiment of the spark plug according to the invention. This embodiment differs from the first two
  • the spark plug has three Zündspalte and thus also three spark gaps.
  • the radial section 6 has three arms 9. At each end of the arms 9, a wear surface 7 is arranged on the combustion chamber side facing away from the arms 9. In Figures 3 and 4, the wear surfaces 7 are indicated by circles.
  • the arms 9 each enclose an angle of approximately 120 °, whereby the "approx.” Manufacturing-related uncertainties and resulting deviations from the stated value are included.

Landscapes

  • Spark Plugs (AREA)

Abstract

L'invention concerne une bougie d'allumage, en particulier pour un moteur à combustion interne. Ladite bougie comprend un boîtier, un isolateur disposé dans le boîtier et présentant un trou axial, une électrode centrale disposée dans le trou axial de l'isolateur, la bougie d'allumage comprenant un axe longitudinal, et au moins un éclateur étant formé entre l'électrode centrale et le boîtier, l'éclateur étant sensiblement parallèle à l'axe longitudinal de la bougie d'allumage et étant formé à une certaine distance de l'axe longitudinal de la bougie d'allumage.
PCT/EP2015/063703 2014-08-21 2015-06-18 Bougie d'allumage comprenant une électrode à masses multiples WO2016026597A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014216582.2A DE102014216582A1 (de) 2014-08-21 2014-08-21 Zündkerze mit Mehrmasseelektrode
DE102014216582.2 2014-08-21

Publications (1)

Publication Number Publication Date
WO2016026597A1 true WO2016026597A1 (fr) 2016-02-25

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ID=53404583

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Application Number Title Priority Date Filing Date
PCT/EP2015/063703 WO2016026597A1 (fr) 2014-08-21 2015-06-18 Bougie d'allumage comprenant une électrode à masses multiples

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DE (1) DE102014216582A1 (fr)
WO (1) WO2016026597A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3955400A1 (fr) 2020-08-10 2022-02-16 Universitatea Tehnica "Gheorghe Asachi" Din Iasi Bougie d'allumage à double décharge électrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT520394B1 (de) * 2017-07-19 2020-04-15 Pges Guenther Herdin Technisches Buero Gmbh Zündkerze

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR21401E (fr) * 1917-11-05 1920-09-13 Joseph Marie Etienne Franc Bougie d'allumage pour moteurs à explosions
FR582492A (fr) * 1924-04-11 1924-12-19 Bougie d'allumage pour moteur à explosion
US3958144A (en) * 1973-10-01 1976-05-18 Franks Harry E Spark plug
US20120133264A1 (en) * 2004-09-28 2012-05-31 Robert Morin Spark plug with firing end having downward extending tines

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1626081A (en) * 1921-07-21 1927-04-26 Hadrich George Spark plug
US2900546A (en) * 1956-07-09 1959-08-18 Andrew C Russell Spark plug assembly
DE4140834A1 (de) * 1990-12-11 1992-06-17 Sei Young Kim Zuendkerze fuer verbrennungsmotoren
KR200262294Y1 (ko) * 2001-10-23 2002-03-18 김세영 점화 스파크 플러그
JP4013891B2 (ja) * 2003-11-14 2007-11-28 株式会社デンソー スパークプラグ
US20090167135A1 (en) * 2004-09-28 2009-07-02 Robert Morin Spark plug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR21401E (fr) * 1917-11-05 1920-09-13 Joseph Marie Etienne Franc Bougie d'allumage pour moteurs à explosions
FR582492A (fr) * 1924-04-11 1924-12-19 Bougie d'allumage pour moteur à explosion
US3958144A (en) * 1973-10-01 1976-05-18 Franks Harry E Spark plug
US20120133264A1 (en) * 2004-09-28 2012-05-31 Robert Morin Spark plug with firing end having downward extending tines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3955400A1 (fr) 2020-08-10 2022-02-16 Universitatea Tehnica "Gheorghe Asachi" Din Iasi Bougie d'allumage à double décharge électrique

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Publication number Publication date
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