WO1993000731A1 - Bougie d'allumage pour l'allumage de melanges carburant-air - Google Patents

Bougie d'allumage pour l'allumage de melanges carburant-air Download PDF

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Publication number
WO1993000731A1
WO1993000731A1 PCT/DE1992/000496 DE9200496W WO9300731A1 WO 1993000731 A1 WO1993000731 A1 WO 1993000731A1 DE 9200496 W DE9200496 W DE 9200496W WO 9300731 A1 WO9300731 A1 WO 9300731A1
Authority
WO
WIPO (PCT)
Prior art keywords
spark plug
combustion chamber
connection
plug according
diode cascade
Prior art date
Application number
PCT/DE1992/000496
Other languages
German (de)
English (en)
Inventor
Hans Schäfer
Dittmar Klett
Hermann Kersting
Bernd Müller
Jochen Fischer
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
Priority to BR9206181A priority Critical patent/BR9206181A/pt
Priority to PL92301466A priority patent/PL168237B1/pl
Priority to EP92911138A priority patent/EP0591250B1/fr
Priority to DE59205614T priority patent/DE59205614D1/de
Priority to CS932831A priority patent/CZ281015B6/cs
Priority to JP51069392A priority patent/JP3373202B2/ja
Priority to KR1019930703975A priority patent/KR940701594A/ko
Publication of WO1993000731A1 publication Critical patent/WO1993000731A1/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
    • H01T13/40—Sparking plugs structurally combined with other devices
    • 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
    • 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
    • F02P9/00—Electric spark ignition control, not otherwise provided for
    • F02P9/002—Control of spark intensity, intensifying, lengthening, suppression

Definitions

  • the invention relates to a spark plug for igniting fuel-air mixtures, in particular for internal combustion engines in motor vehicles, and relates to the installation of an electronic voltage switching element built into the longitudinal bore of the associated electrical insulating body, namely to the installation of a breakdown diode cascade;
  • the breakover diode cascade which suddenly changes from the blocking state to the conductive state at a preselectable and predetermined voltage, has the purpose of only switching the voltage on the secondary winding of the ignition coil to the spark gap of the spark plug when the ignition voltage is reached, and consequently energy losses in the region of the combustion chamber section of the electrical insulator, which can otherwise occur as a result of shunts caused by electrically conductive deposits.
  • the invention has for its object to arrange the breakdown diode cascade and the adjacent components so that a large-scale suitable, inexpensive and production-safe assembly of such spark plugs is ensured and the spark plugs assembled in this way are able to withstand the loads acting on them (eg temperature changes, vibrations) in the long term.
  • the sheathing of the tilting diode cascade consists of a material which is only slightly resilient or of an elastic material, so that sparkovers between the two spaced-apart connecting parts of the tilting diode cascade are prevented with particular certainty.
  • the connecting part also has anchoring means which can withstand torsional stresses acting on the sheathing of the tilting diode cascade capital; Torsion-proof anchoring means of this type are particularly expedient for spark plugs in which the connecting part is fastened by screwing it into the connection-side region of the longitudinal bore of the electrical insulating body.
  • the spark plug it is also simpler in terms of its assembly and safer in terms of electrical contact between the tilting diode cascade and connecting bolts, if for this purpose a ring-like contact part on the tilting diode cascade and a correspondingly dimensioned, coaxial connection on the connection-side end of the connecting bolt ler contact pin are provided; alternatively, one can also be used to make contact between the tilting diode cascade and the connecting bolt Spring element are used, which is preferably firmly connected to the Kippdioden ⁇ cascade.
  • FIG. 1 shows a first embodiment of a spark plug according to the invention, shown enlarged, in longitudinal section (connecting part cemented or glued into the electrical insulating body; connecting wire pressed into the connecting bolt of the breakover diode cascade),
  • FIG. 2 shows the further enlarged unit of the connection part and the covered breakdown diode cascade according to 1
  • 3 shows a second embodiment of a spark plug according to the invention, shown enlarged, in longitudinal section (connecting part screwed into the electrical insulating body; ring-like contact part on the tilting cascade and contact pin on the connecting bolt),
  • FIG Tilting diode cascade according to FIG. 3 FIG.
  • FIG. 5 shows a third embodiment of a spark plug according to the invention, shown enlarged, in longitudinal section (connecting part screwed into the electrical insulating body; for contacting the breakdown diode cascade and connecting bolt) and
  • FIG. 6 shows the further enlarged constructional unit of the connecting part and the covered breakdown diode cascade according to FIG. 5.
  • the (high-voltage) spark plug 10 shown in FIG. 1 has an essentially tubular metal housing 11 which has a screw thread 12, a hexagon key 13 and a sealing ring 14 on its outside as a means for installing the spark plug 10 in an internal combustion engine (not shown), in particular in an internal combustion engine of motor vehicles;
  • This metal housing 11 has a corrosion-resistant ground electrode 15 in the region of its firing-side end, which in the previous example is designed as a welded, bent wire, but also from another Configuration can be.
  • the metal housing 11 comprises in its step-shaped through bore 16 in a known manner a rotationally symmetrical electrical insulating body 17, which in a known manner z. B.
  • connection side consists essentially of sintered aluminum oxide, on the connection side has a so-called head 17/1, which in the direction of the combustion chamber is joined by a collar 17/2, a collar shoulder 17/3 and a foot 17/4.
  • This electrical insulating body 17 lies with a shoulder 18, which is formed between the base 17/4 and the shoulder 17/3, on a shoulder 19 in the through hole 16 of the metal housing 11;
  • a sealing ring 20 is usually arranged between the shoulder 18 and the shoulder 19.
  • connection-side shoulder 21 which is formed between the head 17/1 and the collar 17/2 of the electrical insulating body 17, there is usually a flange ring 22;
  • the connection-side region of the metal housing 11 is shaped as a flange 23 via this flange ring 22.
  • the electrical insulating body 17 is held firmly and tightly in the metal housing 11; the shrink area of the metal housing 11 is identified in FIG. 1 by the reference number 11/1.
  • the electrical insulating body 17 can also be fixed in a known manner by cementing or the like in the metal housing 11.
  • the electrical insulating body 17 has, in a known manner, a step-shaped longitudinal bore 24 whose head bore 24/1 located in the connection-side area has a larger diameter than the foot bore 24/2 located in the combustion chamber-side area of the electrical insulating body 17; the foot hole 24/2 begins approximately in the area of the shoulder 17/3.
  • a center electrode 25 extends in this foot hole 24/2, the shaft 25/1 of which essentially fills the cross section of the foot hole 24/2 of the electrical insulator body foot 17/4, with its end on the combustion chamber side facing the ground electrode 15 over a spark gap 26 and merges at its connection-side section via a collar 25/2 into a head 25/3, which is again provided with a smaller diameter.
  • This central electrode 25 lies in the longitudinal bore 24 on the shoulder 24/3 formed between the head bore 24/1 and the foot bore 24/2 and consequently determines the longitudinal fixation of this central electrode 25.
  • This central electrode 25 is known Way from a corrosion-resistant material (z. B. nickel alloy), it can in a known manner also with a (not shown) core made of heat-conducting material (z. B. copper) and / or in the ignition area with erosion-resistant noble metals or be provided.
  • the head 25/3 of the center electrode 25 can preferably be provided with anchoring means (not shown) (for example grooves, wings) and be surrounded with an electrically conductive and also heat-conductive casting compound 27 which surrounds the area located here the head bore 24/1 of the Elektroisolier ⁇ body 17 fills and extends in this head bore 24/1 even further connection side.
  • Potting compounds 27 of this type are known (for example from DE-PS 1206 209, US Pat. No. 2,106,158), they can additionally also be provided with substances acting as electrical resistance (for example US-PS 3 903 453).
  • a connecting bolt 28 with its shank 28/1 dips into this potting compound 27, the surface of which is equipped in a known manner with knurling or the like for better anchoring and the outside diameter of which is smaller than the inside diameter of the longitudinal bore 24 of the electrical insulating body 17.
  • This Connecting bolt 28 consists of a metal and has a head 28/2 adjoining its shaft 28/1; this Head 28/2 has a diameter which is larger than the diameter of the shaft 28/1 and almost fills the cross section of the longitudinal bore 24 of the electrical insulating body 17.
  • a coaxial blind hole 28/4 is located in the connection-side end face 28/3 of this head 28/2.
  • the connecting bolt 28 is adjoined on the connection side by a tilting diode cascade 29, as is known in principle from the German patent application DE 37 31393 AI;
  • a breakdown diode cascade 29 serves as a voltage switch, in the case of the high-voltage spark plug 10 described here in FIG on reaching the ignition voltage to the spark gap 26 of the spark plug 10. Due to such a breakover diode cascade 29, it is caused that the sparks that jump over between the center electrode 25 and the ground electrode 15 are high in energy; Energy losses due to electrically conductive deposits on the outside of the foot 17/4 from the electrical insulating body 17 are avoided due to this measure.
  • this breakover diode cascade 29 has the shape of a cylinder (see also FIG. 2), but can also be of a different configuration (for example a column with a polygonal cross section).
  • the shaft 29/1 of this breakover diode cascade 29 is delimited on the combustion chamber side by an end face 29/2 and on the connection side by an end face 29/3, from each of which a connecting wire 29/4 or 29/5 protrudes; these connecting wires 29/4 and 29/5 are relatively short and stiff and, in a preferred embodiment, their surfaces are provided with (unidentified) knurling, preferably with longitudinal knurling.
  • Toggle diode cascade 29 contains a number of diodes of certain reverse voltage and is electrically connected in series; Depending on the dielectric strength and the desired ignition voltage, a corresponding number of diodes are accommodated in this shaft 29/1, preferably stacked on top of one another and connected to one another.
  • 25 such diodes would be required for a desired ignition voltage of, for example, 25 kV, provided that each of the diodes used has a reverse voltage of 1 kV.
  • the construction of such a tilting diode cascade 29 is not the subject of the present invention.
  • This breakdown diode cascade 29 is fixed with its combustion-chamber-side connecting wire 29/4 in the blind hole 28/4 of the connecting bolt 28 by pressing in, while the connecting-side connecting wire 29/5 is connected to a metallic connecting part 30.
  • This connection part 30 is essentially rotationally symmetrical and is subdivided into the connection-side head 30/1, the adjoining collar 30/2, the fastening section 30/3 which then follows and the coaxial attachment 30/4 which then still follows;
  • a coaxial blind hole 30/6 is incorporated in the combustion chamber end face 30/5 of the connecting part 30, the diameter of which is dimensioned such that the knurled connecting wire 29/5 on the side of the breakover diode cascade 29 can be press-fitted therein.
  • Anchoring means 30/7 in the form of a longitudinal knurl, a cross knurl or the like are attached to the outside of the coaxial extension 30/4.
  • Knurling 30/8 is also formed on the outside of the fastening section 30/3, e.g. B. a longitudinal, transverse or cross knurling, but instead ring grooves or a thread can be used.
  • connection part 30 is in the head bore 24/1 of the longitudinal bore 24 in the electrical insulating body 17 and lies with its collar 30/2 on the connection-side end face 17/5 of the electrical insulating body 17; the fastening section 30/3 provided with knurling 30/8 of the connection part 30 in the connection-side area of the head bore 24/1 of the longitudinal bore 24 in the electrical insulating body 17 by means of putty or adhesive in a known manner.
  • chambers (not shown) can also be provided for receiving putty or adhesive.
  • the tilting diode cascade 29 is covered by an electrically insulating sheathing 31, which - at least with its cylindrical peripheral surface 31/1 partially - can be inserted sealingly into the head bore 24/1 of the electrical insulating body 17 and is therefore preferably provided with outwardly pointing annular lips 31/2;
  • this covering 31 can consist of a material which is only slightly resilient (eg a plastic such as elastomers), but can also consist of an elastic material (rubber-like substances such as PTF ⁇ ).
  • This sheath 31 projects beyond the area of the shaft 29/1 of the tilting diode cascade 29 on the connection side, still encompasses the coaxial extension 30/4 of the connection part 30 and holds securely to the anchoring means 30/7 attached to the outside.
  • the casing 31 is produced according to this exemplary embodiment by injection molding the selected material around the tilting diode cascade 29, but can also be made by pushing or shrinking corresponding components onto the tilting diode cascade 29.
  • the connecting part 30, the tilting diode cascade 29 and the casing 31 thus form a common component which can be handled easily and reliably during the assembly of such spark plugs 10.
  • the head 30/1 of the connecting part 30 is shown in the present embodiment with a standardized profile (SAE profile) but also - as is often the case - be designed in such a way that a threaded pin 30/9 is provided on the collar 30/2 of this connecting part 30 on the connection side, onto which a nut 30/10 is screwed, which has an SAE on its outside Profile has.
  • SAE profile standardized profile
  • the middle electrode 25 is first inserted into the foot hole 24/2 of the electrical insulating body 17, so that it rests with its collar 25/2 on the shoulder 24/3 in the longitudinal hole 24 of the electrical insulating body 17 is coming. Then a predetermined amount of the powdery or granular, still cold casting compound 27 is added to the longitudinal bore 24 of the vertically held electrical insulating body 17 and then the connecting bolt 28 is also arranged above it.
  • This arrangement is heated in a vertical position in such a way that the casting compound 27 melts and then the connecting bolt 28 with its shaft 28/1 is pressed into the molten casting compound 27 to a certain extent; the casting compound 27 then rises in part into the annular gap formed between the connecting pin shaft 28/1 and the electrical insulating body head bore 24/1.
  • the assembly formed by the connecting part 30, the tilting diode cascade 29 and the casing 31 is inserted into the head bore 24/1 of the electrical insulating body 17 on the connection side, to such an extent that the connecting wire 29/4 of the tilting diode cascade 29 on the combustion chamber side fits into the press fit the blind hole 28/4 of the connecting bolt 28 is immersed.
  • the fastening section 30/3 of the connecting part 30 Before inserting the last-mentioned structural unit into the head bore 24/1 of the electrical insulating body 17, the fastening section 30/3 of the connecting part 30 has been provided with a putty or an adhesive which then hardens after the structural unit described has been pushed in; Instead of coating the fastening section 30/3 of the connecting part 30 with the adhesive or the cement, this area of the head bore 24/1 of the electrical insulating body 17 may alternatively also have been provided with it.
  • the immersion depth of the connecting part 30 and thus also the immersion depth of the tilting diagonal cascade 29 in the longitudinal bore 24 of the electrical insulating body 17 is determined by the collar 30/2 as a result of striking the end face 17/5 of the electrical insulating body 17.
  • the further assembly of the spark plug 10 with the metal housing 11 etc. can be carried out in a known manner and is no longer the subject of the present invention.
  • the spark plug 10 described above is suitable for large-scale production, ensures cost-effective and production-safe assembly, resists the loads acting on it, and by means of its tilting diode cascade 29 prevents electrical shunts, which in spark plugs of this type often result from electrically conductive deposits the electrical insulating body foot 17/4 are present.
  • the arrangement of the components described with reference to FIGS. 1 and 2 can also be used for spark plugs in which the central electrode is sintered into a smaller diameter foot hole in the electrical insulating body - as is known, for example, from EP patent specification 0 101 547 is; in this case, a contact pin arranged above the actual center electrode in this embodiment of a spark plug must also be provided.
  • This arrangement according to the invention can also be used in spark plugs with sliding spark gaps, as they have long been state of the art, the electrical insulator forming the sliding spark gap being able to be made in a known manner from a semiconducting material (eg SiC); such spark plugs are known to have a considerably lower ignition voltage requirement (low-voltage spark plugs). Also, this arrangement may find use in spark plugs having a likewise known per se combined air and creepage ⁇ route.
  • a semiconducting material eg SiC
  • this arrangement may find use in spark plugs having a likewise known per se combined air and creepage ⁇ route.
  • the invention can also be advantageously used for fully shielded spark plugs, in which, as is known, the area located on the connection side of the metal housing is also surrounded by a metal tube.
  • FIG. 3 and 4 show a second embodiment of a spark plug 10 'according to the invention.
  • This spark plug 10 ' also has a connection part 30' and a breakover diode cascade 29 'which are connected to one another by means of a sheath 31'.
  • connection part 30' with its fastening section 30/3 'not only in the connection-side section of the head bore 24/1' of the Electrical insulating body 17 'is inserted and fixed by means of adhesive or putty, but in this exemplary embodiment of the spark plug 10', the fastening section 30/3 'of the connecting part 30' is provided with a thread 30/8 'which fits into a correspondingly female thread 17/6 'provided head bore 24/1' is screwed into the electrical insulating body 17 *; To secure the connecting part 30 ', some adhesive is preferably added to this thread section 17/6', 30/8 '.
  • the coaxial extension 30/4 ' is on the combustion chamber end section of the connecting part 30' with an anchoring means 30 / 7 '(longitudinal or cross knurling). Due to the rotational movement when screwing the connecting part 30 'into said head bore 24/1', the plug connection shown in FIG. 1 between the knurled connecting wire 29/4 on the combustion chamber side and the blind hole 28/4 located in the head 28/2 of the connecting bolt 28 is not sure enough.
  • a ring-like contact part 32 ' is connected to the combustion chamber-side end face 29/2 "of the tilting diode cascade 29' (eg by welding); this ring-like contact part 32 'is coaxial with the tilting diode cascade 29 'aligned, preferably provided with a longitudinal slot 32/2' in this embodiment and can be equipped with an outwardly widening insertion cone 32/3 'to simplify assembly on the combustion chamber side; this ring-like contact part 32' is made of spring material and has an outer opening ⁇ knife that is smaller than the maximum diameter of the envelope 31 'of the breakover diode cascade 29'.
  • this ring-like contact part 32' is pushed tightly over a contact pin 28/5 'which extends coaxially from the connection-side end face 28/3' of the connecting bolt 28 '; this contact pin 28/5 'is provided on its connection-side end section with a tapered insertion section 28/6' which, together with the insertion cone 32/3 'of the ring-like contact part 32' on the tilting diode cascade 29 ', facilitates and secures the assembly .
  • a blind hole-like hexagon socket 30/12' is formed in the connection-side end face 30/11 'of the connection part 30'; when assembling this spark plug 10 ', a tool fits into this blind hole-like hexagon socket 30/12' and rotates the connecting part 30 including the tilting diode cascade 29 ', sheathing 31' and ring-like contact part 32 'up to the stop of the collar 30/2' on the connection-side end face 17 / 5 'in the head bore 24/1' of the electrical insulating body 17 '.
  • FIGS. 5 and 6 describe a spark plug 10 "which largely corresponds to the spark plug 10 'according to FIGS. 3 and 4, but instead of a ring-like contact part 32' and a contact pin 28/5 'on the connecting bolt Head 28/2 'has a spring element 33 ", which in the preferred embodiment is connected to the combustion chamber end face 29/2" of the tilting diode cascade 29 "surrounded by the casing 31".
  • the spring element shown in FIGS. 5 and 6 is a strip made of resilient material, which is bent in an S-shape, with its leg 33/1 "on the connection side for connection to the tilting cascade 29" and its free leg 33/2 "as a contact element with the end face 28/3 "of the connecting bolt 28" is used.
  • this spark plug 10 is a U-shaped or a zigzag-shaped spring element, but disc springs or helical wire coils can also be used for this.
  • the connecting part 30" of this spark plug 10 "becomes a spark plug in this exemplary embodiment 10 "again by screwing into the head bore 24/1" of the electrical insulating body 17 ", if necessary with the addition of an adhesive or kit. Otherwise, the construction of this spark plug 10 "corresponds to the construction of the spark plug 10 'according to FIGS. 3 and 4 and the same applies accordingly to exemplary embodiment 1 according to FIGS. 1 and 2 with regard to the types of spark plugs that have other electrode shapes, Electrode arrangements, different spark gaps or the like.

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  • 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)

Abstract

Pour empêcher les shunts électriques dans la section côté chambre de combustion des bougies d'allumage pour mélanges carburant-air, et par conséquent pour produire des étincelles en permanence riches en énergie, une cascade de diodes à quatre couches (29) est incorporée dans l'alésage longitudinal (24) d'un isolateur (17). Cette cascade de diodes à quatre couches (29), conjointement avec l'écrou de connexion (30) de la bougie d'allumage (10), constitue un composant et est entourée d'une chemise électriquement isolante (31) qui vient remplir le trou oblong (24) de l'isolateur (17). Côté chambre de combustion, la cascade de diodes à quatre couches (29) est couplée électriquement à une tige de connexion (28), laquelle plonge avec sa section côté chambre de combustion dans une masse de remplissage électriquement conductrice (27) de type connu, et laquelle est par conséquent reliée à l'électrode centrale (25) de la bougie d'allumage (10). Il est décrit plusieurs formes de réalisation faciles à monter et d'un fonctionnement fiable d'une cascade de diodes à quatre couches (29) à monter dans l'isolateur (17) de bougies d'allumage (10).
PCT/DE1992/000496 1991-06-22 1992-06-17 Bougie d'allumage pour l'allumage de melanges carburant-air WO1993000731A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BR9206181A BR9206181A (pt) 1991-06-22 1992-06-17 Vela de ignição para a inflamação de misturas de combustível-ar
PL92301466A PL168237B1 (pl) 1991-06-22 1992-06-17 Swieca zaplonowa do zaplonu mieszanki paliwowo-powietrznej PL PL
EP92911138A EP0591250B1 (fr) 1991-06-22 1992-06-17 Bougie d'allumage pour l'allumage de melanges carburant-air
DE59205614T DE59205614D1 (de) 1991-06-22 1992-06-17 Zündkerze zum zünden von kraftstoff-luft-gemischen
CS932831A CZ281015B6 (cs) 1991-06-22 1992-06-17 Zapalovací svíčka pro zapalování směsi paliva se vzduchem
JP51069392A JP3373202B2 (ja) 1991-06-22 1992-06-17 燃料−空気混合気を点火するための点火プラグ
KR1019930703975A KR940701594A (ko) 1991-06-22 1992-06-17 연료-공기 혼합기의 점화용 스파크 플러그

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4120659A DE4120659A1 (de) 1991-06-22 1991-06-22 Zuendkerze zum zuenden von kraftstoff-luft-gemischen
DEP4120659.2 1991-06-22

Publications (1)

Publication Number Publication Date
WO1993000731A1 true WO1993000731A1 (fr) 1993-01-07

Family

ID=6434530

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/000496 WO1993000731A1 (fr) 1991-06-22 1992-06-17 Bougie d'allumage pour l'allumage de melanges carburant-air

Country Status (10)

Country Link
EP (1) EP0591250B1 (fr)
JP (1) JP3373202B2 (fr)
KR (1) KR940701594A (fr)
BR (1) BR9206181A (fr)
CZ (1) CZ281015B6 (fr)
DE (2) DE4120659A1 (fr)
ES (1) ES2085016T3 (fr)
HU (1) HU215726B (fr)
PL (1) PL168237B1 (fr)
WO (1) WO1993000731A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173056A (en) * 1960-08-11 1965-03-09 Stackpole Carbon Co Spark plug containing electrical resistor
FR2075054A5 (fr) * 1970-01-14 1971-10-08 Champion Spark Plug Co
US4308487A (en) * 1980-01-30 1981-12-29 Feaster James L Dual internal electric spark plug
WO1989002528A1 (fr) * 1987-09-18 1989-03-23 Robert Bosch Gmbh Commutateur a haute tension

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173056A (en) * 1960-08-11 1965-03-09 Stackpole Carbon Co Spark plug containing electrical resistor
FR2075054A5 (fr) * 1970-01-14 1971-10-08 Champion Spark Plug Co
US4308487A (en) * 1980-01-30 1981-12-29 Feaster James L Dual internal electric spark plug
WO1989002528A1 (fr) * 1987-09-18 1989-03-23 Robert Bosch Gmbh Commutateur a haute tension

Also Published As

Publication number Publication date
HUT67447A (en) 1995-04-28
CZ283193A3 (en) 1994-04-13
KR940701594A (ko) 1994-05-28
BR9206181A (pt) 1995-10-10
DE4120659A1 (de) 1992-12-24
ES2085016T3 (es) 1996-05-16
DE59205614D1 (de) 1996-04-11
HU215726B (hu) 1999-02-01
JPH06509204A (ja) 1994-10-13
JP3373202B2 (ja) 2003-02-04
PL168237B1 (pl) 1996-01-31
EP0591250B1 (fr) 1996-03-06
HU9303646D0 (en) 1994-04-28
CZ281015B6 (cs) 1996-05-15
EP0591250A1 (fr) 1994-04-13

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