EP1897193B1 - Zündkerze für einen verbrennungsmotor - Google Patents

Zündkerze für einen verbrennungsmotor Download PDF

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Publication number
EP1897193B1
EP1897193B1 EP06726273A EP06726273A EP1897193B1 EP 1897193 B1 EP1897193 B1 EP 1897193B1 EP 06726273 A EP06726273 A EP 06726273A EP 06726273 A EP06726273 A EP 06726273A EP 1897193 B1 EP1897193 B1 EP 1897193B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
essentially
core
winding
plug
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.)
Not-in-force
Application number
EP06726273A
Other languages
English (en)
French (fr)
Other versions
EP1897193A1 (de
Inventor
Xavier Jaffrezic
André AGNERAY
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.)
Renault SAS
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1897193A1 publication Critical patent/EP1897193A1/de
Application granted granted Critical
Publication of EP1897193B1 publication Critical patent/EP1897193B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/50—Sparking plugs having means for ionisation of gap
    • 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
    • H01T13/40—Sparking plugs structurally combined with other devices

Definitions

  • the tightening torque of the spark plug is generally applied to the base of the spark plug, the cap comprising, conventionally, a male thread intended to cooperate with a thread. complementary female made in the cylinder head, and an element for the controlled tightening of the threaded connection.
  • a mounting method then requires the use of a specific tool that is slid around the coil and the candle, in the access well to the candle: such a configuration therefore imposes, in particular, that there is, around the coil and in the access hole to the candle, an unused free space outside the operations of assembly and disassembly of the candle.
  • the existence of such a space goes against the dimensional constraints previously mentioned.
  • conductive thin layer of a material having a high electrical conductivity will also denote a metal layer of non-magnetic material having a thickness at least equal to or greater than the skin thickness in the frequency domain under consideration. that is, between 1 Megahertz and 10 Megahertz, ensuring an electromagnetic shielding function.
  • the high conductivity of materials will be similar to that of copper or silver, reference materials in this area.
  • a cap consisting of a substantially cylindrical tubular portion terminated by a substantially planar flange whose outside diameter is greater than the diameter of the access well and whose surface is substantially perpendicular to the axis of the tubular part and the well of access, then comes to be placed on the upper part of the candle.
  • the dimensions of the cap are adjusted so that, when the substantially flat flange bears against the upper face of the well access to the spark plug, the end of the tubular portion of the cap bears against a portion of the spark plug, thus ensuring a compression hold of the candle in its access well: the tightening of the assembly is achieved by screwing the substantially flat flange on the upper face of the combustion chamber.
  • the coil is further integrated in the cap, the electrical contact between the coil and the spark plug being achieved by means of a coil spring set in compression during positioning of the cap.
  • Such a device if it eliminates the need to provide a space specifically for the passage of a clamping tool in the access well to the candle, however requires the achievement of a large number of parts precision.
  • a radiofrequency plasma spark plug generally comprises an upper part, essentially inductive, consisting mainly of the spark plug coil and a shielding casing of the essentially inductive portion, and a substantially capacitive lower portion composed mainly of a structure coaxial, the whole behaving like an LC resonator.
  • a substantially capacitive lower portion composed mainly of a structure coaxial, the whole behaving like an LC resonator.
  • the dimensions of said resonator elements must be defined, as a function of the radiofrequency operating range, so as to optimize the performance of the resonator: in particular, the length of the essentially capacitive portion must also be reduced as possible, taking into account the geometric characteristics of the access thread to the combustion chamber, so that the value of the capacity remains low.
  • the diameter of the substantially inductive portion should be as high as possible, so that the value of the overvoltage coefficient of the resonator thus formed is optimal.
  • the object of the present invention is to propose an assembly device in which the connection between the coil and the other elements constituting the spark plug ensures both electrical continuity and mechanical coupling, while allowing the assembly to be put in place. thus formed without having to slide a tool around the coil to come to bear on the base of the candle.
  • the invention proposes a candle of the type mentioned above, characterized in that the mandrel is deformable elastically to compensate for the effects of insulation expansion.
  • the mandrel is a polygonal section cylinder.
  • the mandrel is a cylinder of revolution.
  • the mandrel is a tube.
  • the mandrel is a solid cylinder.
  • the mandrel comprises at one of its ends an axial depth recess which receives a plug and in that the depth is equal to or greater than a distance defined between the end of the mandrel and a first turn of the winding.
  • the end corresponds to the connection with the central electrode.
  • the cap is made of high-density polymer.
  • the mandrel is chosen from polymers.
  • the invention applies to a radiofrequency plasma spark plug.
  • a radiofrequency plasma plug 1 of substantially cylindrical general shape mainly comprises a substantially capacitive bottom portion C and a substantially inductive upper part I, the parts C and I being of substantially elongate shape, connected in series and having a common longitudinal axis Z.
  • a rigid connection mode is introduced between some of the elements of each of the essentially capacitive C and essentially inductive I parts.
  • the substantially capacitive portion C comprises, in particular, a base 2 intended to be connected to the ground and surrounding a central electrode 3, substantially cylindrical, axis Z, acting as a high voltage electrode.
  • An electrically insulating block, called “insulator” 4 is placed between the base 2 and the central electrode 3, the insulator 4 being configured to guide the sparks between the electrodes 2 and 3.
  • the base 2 has, on the outer face of its lower part closest to the cylinder head of the internal combustion engine equipped with the spark plug 1, a form suitable for the establishment, maintenance and tightening of the candle 1 on the cylinder head (for example and in a nonlimiting manner, as shown in FIG. figure 1 : a thread).
  • the essentially inductive part I of the spark plug 1 comprises, for its part, a winding 5 whose axis is advantageously substantially coincident with the axis Z of the central electrode 3 and the spark plug 1.
  • the winding 5 is, moreover surrounded by an envelope 6. It is intended to reduce the electromagnetic emissions of the spark plug 1 and to act as a shield.
  • the tightening torque for making the connection between the essentially capacitive part C and the essentially inductive part I of the spark plug 1 is transmitted by the envelope 6.
  • the main advantage of this type of transmission is that it reduces the constraints the largest radius available, where the leverage effect is optimal, thus minimizing the mechanical stress on the materials themselves.
  • the transmission of the tightening torque of the essentially inductive part I to the essentially capacitive part C then amounts to the transmission of a torsion torque of the envelope 6 to the base 2.
  • This envelope 6 is made of a rigid material for example a polymer, a metal.
  • the envelope 6 can be made in different metallic materials and by different techniques. appropriate. It may especially, by way of example and in a non-exhaustive manner, be carried out simultaneously with the base 2 (by stamping or stamping), or be welded to the base 2 after separate production of the two parts (stamping of the base 2 and drawing / rolling of the envelope 6).
  • the inner face of the envelope 6 must be coated with a layer of a few tens of microns thick (typically 30 to 50 microns, for example) of a material with high electrical conductivity (for example and without limitation: silver or copper), in order to improve the radiofrequency conductivity of the envelope 6 and to limit the losses by skin effect within it.
  • the transmission of the tightening torque (torsional torque here) of the essentially inductive part I to the essentially capacitive part C of the spark plug is obtained by the rigid metallic connection made during manufacture between the envelope 6 and the base 2, by one of the means described above (simultaneous manufacture of the casing and the base by stamping or stamping, or separate fabrications, then rigid assembly of the casing 6 and the base 2, for example by welding).
  • the envelope 6 In the case where the envelope is made of an insulating material of polymer type. Since these materials have a lower mechanical rigidity than metallic materials, the envelope 6 must then have a relatively large thickness (substantially, and for example, of the order of a few millimeters) so as to allow the transmission of the clamping torque at the base 2. In order to ensure the shielding function of the essentially inductive part, the outside face of the envelope 6 must be coated with a layer of a few tens of microns thick (typically and as a non-limiting example: 30 to 50 ⁇ m) of a material with high electrical conductivity (for example and without limitation: silver or copper).
  • a layer of a few tens of microns thick typically and as a non-limiting example: 30 to 50 ⁇ m
  • a material with high electrical conductivity for example and without limitation: silver or copper
  • this coating to the outer face of the casing 6 makes it possible to increase slightly the outside diameter of the essentially inductive part I, which improves the coefficient of overvoltage of the resonator consisting of parts C and I.
  • the transmission of the tightening torque between the substantially I portion and the substantially capacitive portion C of the spark plug 1 is obtained by appropriate shaping of the interface between the base 2 and the envelope 6 as described in the unpublished patent application FR0452790 .
  • an insulator 7 is placed between the winding 5 and the casing 6, and the winding 5 is made around the mandrel 8.
  • a complementary insulator 9 is furthermore placed between the insulator 7 and the insulator 4 separating the base 2 and the central electrode 3, a part 10 electrically connected to the base 2 ensuring the connection between the holding of the insulators 4, 7, and 9.
  • a current measuring winding 11 is also generally made around the winding 5, and a connection device 13, integral with a connector 12 (not detailed in the figures), is placed at the upper end of the candle 1.
  • the upper turn 52 of the winding 5 is connected to the connector 12, the lower turn 51 of the winding 5 being connected by appropriate means 14 (not detailed in the figures) to an inner end of the central electrode 3.
  • the length of the connection between the essentially capacitive part C and the essentially inductive part I should be reduced as much as possible.
  • the overvoltage coefficient of the resonator LC constituted by the essentially inductive part I and the essentially capacitive part C placed in series is all the better that the diameter of the essentially inductive part I is high.
  • the electrical quality of the connection between the essentially capacitive C and inductive I parts (electrical continuity, in particular) must also be maximum in order to optimize the performance of the resonator.
  • the mandrel 8 is a tube of elastically deformable polygonal section. As shown in figure 2 , the tube is hexagonal section.
  • the thickness of each of the walls or axial faces 82 is dimensioned such that the walls or axial faces 82 are able to deform elastically.
  • the walls or axial faces 82 may have a thickness between 0.2 and 0.5 mm.
  • the insulator 7 placed between the winding 5 and the casing 6 may be chosen from fluids or non-compressible solids having a significant coefficient of expansion with the temperature, for example and without limitation the silicone. In this case, the walls or axial faces 82 may deform elastically so as to compensate for the effects of the expansion of the insulator 7.
  • the walls or the axial faces 82 may curl radially inwards of the tube and the axial edges 83 keep a substantially identical positioning allowing the coil to keep substantially the same winding position around the mandrel 8, as shown in FIG. figure 3 .
  • the mandrel 8 is a solid cylinder with an elastically deformable polygonal section. As shown in figure 4 , the full cylinder is cylindrical section.
  • the mandrel 8 is chosen from compressible materials such as polymers (for example: polymer foam, expanded polymer).
  • the insulator 7 placed between the coil 5 and the casing 6 may be chosen from fluids or non-compressible solids having a significant coefficient of expansion with temperature, for example and without limitation the silicone. In this case, the mandrel 8 can be deformed by a decrease in its volume so as to compensate for the effects of the expansion of the insulator 7, as shown in FIG. figure 5 .
  • the materials generally chosen have a low density. It follows a reduction in mass of the winding / spark plug assembly and therefore a significant gain in terms of the inertia of the vibrating parts.
  • the mandrel 8 has at one of its ends 81 an axial depth of depth h which receives a plug 20.
  • the depth h is equal to or greater than a distance d defined between the end 81 of the mandrel 8 and the lower turn 51 of the coil 5.
  • the plug 20 is dimensioned to ensure the mechanical retention and coaxiality between the mandrel 8 and the central electrode 3, the mandrel 8 has, at its end 81, the plug 20 pierced with a hole 21 so that at least the head of the electrode Central 3 passes through this hole 21.
  • the plug 20 may be of high density polymer such as polyethylene.
  • connection element 13 intended to connect the connector 12 to the electrical power supply of the candle 1.
  • the element 13, bound in a rigid form, in particular to the envelope 6 (for example and in a nonlimiting manner, thanks to a means of the type of those just described for the connection of the envelope 6 with the base 2), has a shape adapted to the use of a simple clamping tool for the introduction and tightening of the spark plug 1 in the cylinder head of the engine.
  • a spark plug 1 according to the invention can be put in place and removed from its access well without being need to slide a specific tool around the candle: it is therefore not necessary to spare, in the access well to the candle 1, a space required for the passage of the specific tool and used only for assembly operations and dismantling the candle.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Fats And Perfumes (AREA)

Claims (9)

  1. Zündkerze (1) für den Verbrennungsmotor eines Kraftfahrzeugs mit allgemein länglicher Form, umfassend:
    - einen im Wesentlichen kapazitiven inneren Teil (C), der zwei koaxiale Elektroden aufweist, eine davon eine Mittelelektrode (3) und einen Gewindekörper (2) zum Verschrauben der Zündkerze (1) mit dem Motor,
    - einen im Wesentlichen induktiven oberen Teil (I), der eine Mittelspule (5), die mehrere Windungen (51) aufweist, welche um einen koaxialen Dorn (8) gewickelt sind, einen Mantel (6) und einen zwischen dem Mantel (6) und der Spule (5) angeordneten Isolator (7) aufweist,
    wobei der im Wesentlichen kapazitive Teil (C) und der im Wesentlichen induktive Teil (I) so mechanisch miteinander verbunden sind, dass sie die Übertragung eines an den Mantel (6) angelegten Anziehmoments auf den im Wesentlichen kapazitiven unteren Teil (C) gestatten,
    dadurch gekennzeichnet, dass der Dorn (8) ein Zylinder mit einem polygonalen Querschnitt ist.
  2. Zündkerze (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Dorn (8) ein Zylinder mit einem polygonalen Querschnitt ist.
  3. Zündkerze (1) nach Anspruch 2, dadurch gekennzeichnet, dass der Dorn (8) ein Kreiszylinder ist.
  4. Zündkerze (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Dorn (8) ein Rohr ist.
  5. Zündkerze (1) nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Dorn (8) ein Vollzylinder ist.
  6. Zündkerze (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dorn (8) an einem seiner Enden (81) eine Ausnehmung mit einer axialen Tiefe (h) aufweist, die einen Stopfen (20) aufnimmt, und dass die Tiefe (h) größer gleich einem zwischen dem Ende (81) des Dorns (8) und einer ersten Windung (51) der Spule (5) definierten Abstand (d) ist.
  7. Zündkerze (1) nach Anspruch 6, dadurch gekennzeichnet, dass das Ende (81) der Verbindung mit der Mittelelektrode (3) entspricht.
  8. Zündkerze (1) nach einem der Ansprüche 6 bis 7, dadurch gekennzeichnet, dass der Stopfen (20) ein Polymer hoher Dichte ist.
  9. Zündkerze (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Dorn (8) unter Polymeren ausgewählt ist.
EP06726273A 2005-06-23 2006-03-23 Zündkerze für einen verbrennungsmotor Not-in-force EP1897193B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0551729A FR2887696B1 (fr) 2005-06-23 2005-06-23 Bougie d'allumage pour moteur a combustion interne
PCT/FR2006/050257 WO2006136742A1 (fr) 2005-06-23 2006-03-23 Bougie d'allumage pour moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1897193A1 EP1897193A1 (de) 2008-03-12
EP1897193B1 true EP1897193B1 (de) 2010-05-19

Family

ID=35705235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06726273A Not-in-force EP1897193B1 (de) 2005-06-23 2006-03-23 Zündkerze für einen verbrennungsmotor

Country Status (8)

Country Link
US (1) US7652414B2 (de)
EP (1) EP1897193B1 (de)
JP (1) JP2008544459A (de)
AT (1) ATE468640T1 (de)
DE (1) DE602006014404D1 (de)
ES (1) ES2344994T3 (de)
FR (1) FR2887696B1 (de)
WO (1) WO2006136742A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110657B3 (de) * 2012-11-07 2014-02-06 Borgwarner Beru Systems Gmbh Koronazündeinrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2890247B1 (fr) * 2005-08-25 2007-09-28 Renault Sas Bougie d'allumage plasma pour un moteur a combustion interne
FR2892240B1 (fr) * 2005-10-18 2010-10-22 Renault Sas Bougies d'allumage pour le moteur a combustion interne d'un vehicule automobile
US10622788B1 (en) * 2018-12-13 2020-04-14 Tenneco lnc. Corona ignition assembly including a high voltage connection and method of manufacturing the corona ignition assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE787722A (fr) * 1971-08-20 1973-02-19 Champion Spark Plug Co Bougie d'allumage pour moteur a combustion interne
US3871349A (en) * 1973-01-12 1975-03-18 Brunswick Corp RFI suppression spark plug
US3882341A (en) * 1974-01-24 1975-05-06 Champion Spark Plug Co Spark plug with inductive suppressor
US4029990A (en) * 1976-01-09 1977-06-14 Champion Spark Plug Company Spark plug construction
JP3355252B2 (ja) * 1994-09-14 2002-12-09 東洋電装株式会社 プラグキャップ一体式点火コイル
FR2859869B1 (fr) * 2003-09-12 2006-01-20 Renault Sa Systeme de generation de plasma.
FR2859830B1 (fr) * 2003-09-12 2014-02-21 Renault Sas Bougie de generation de plasma a inductance integree.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012110657B3 (de) * 2012-11-07 2014-02-06 Borgwarner Beru Systems Gmbh Koronazündeinrichtung
US9574540B2 (en) 2012-11-07 2017-02-21 Borgwarner Beru Systems Gmbh Corona ignition device

Also Published As

Publication number Publication date
US7652414B2 (en) 2010-01-26
WO2006136742A1 (fr) 2006-12-28
US20090050123A1 (en) 2009-02-26
FR2887696A1 (fr) 2006-12-29
EP1897193A1 (de) 2008-03-12
FR2887696B1 (fr) 2007-08-24
ATE468640T1 (de) 2010-06-15
ES2344994T3 (es) 2010-09-13
DE602006014404D1 (de) 2010-07-01
JP2008544459A (ja) 2008-12-04

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