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SPARK PLUG RESISTANCE ELEMENT AND SPARK PLUG

20220029390 ยท 2022-01-27

    Inventors

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    International classification

    Abstract

    A spark plug resistance element that includes at least one inorganic amorphous oxide and at least one first inorganic crystalline oxide having a relative dielectric permittivity of at most 15. A spark plug that includes at least one spark plug resistance element is also described.

    Claims

    1-11. (canceled)

    12. A spark plug resistance element, comprising: at least one inorganic amorphous oxide and at least one first inorganic crystalline oxide having a relative dielectric permittivity of at most 15.

    13. The spark plug resistance element as recited in claim 12, wherein the first inorganic crystalline oxide is selected from ZnO, SnO.sub.2, and mixtures thereof.

    14. The spark plug resistance element as recited in claim 12, wherein the inorganic amorphous oxide is a glass.

    15. The spark plug resistance element as recited in claim 12, wherein the inorganic amorphous oxide is a borosilicate glass.

    16. The spark plug resistance element as recited in claim 12, further comprising: at least one second inorganic crystalline oxide, the second inorganic crystalline oxide being selected from ZrO.sub.2, TiO.sub.2, HfO.sub.2, and mixtures thereof.

    17. The spark plug resistance element as recited in claim 12, further comprising: at least one inorganic non-oxidic material, the inorganic non-oxidic material being selected from carbon black, graphite, carbides, metals, and mixtures thereof.

    18. The spark plug resistance element as recited in claim 17, wherein: (i) the carbide is selected from silicon carbide, tungsten carbide, iron carbide, boron carbide, titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, molybdenum carbide, and mixtures thereof, and/or (ii) the metal is selected from iron, tungsten, titanium, copper, silver, and mixtures thereof.

    19. The spark plug resistance element as recited in claim 16, wherein a total content of the first inorganic crystalline oxide and the second inorganic crystalline oxide is from 20 to less than 100 mass % relative in each case to a total mass of the spark plug resistance element.

    20. The spark plug resistance element as recited in claim 16, wherein a total content of the first inorganic crystalline oxide and the second inorganic crystalline oxide is from 40 to 80 mass % relative in each case to a total mass of the spark plug resistance element.

    21. The spark plug resistance element as recited in claim 12, wherein content of the inorganic amorphous oxide is greater than 0 to 80 mass % relative in each case to the total mass of the spark plug resistance element.

    22. The spark plug resistance element as recited in claim 12, wherein content of the inorganic amorphous oxide is greater than 10 to 30 mass % relative in each case to the total mass of the spark plug resistance element.

    23. The spark plug resistance element as recited in claim 17, wherein content of inorganic non-oxidic material is greater than 0 to 20 mass % relative in each case to a total mass of the spark plug resistance element.

    24. The spark plug resistance element as recited in claim 17, wherein content of inorganic non-oxidic material is greater than 0 to 10 mass %, relative in each case to a total mass of the spark plug resistance element.

    25. The spark plug resistance element as recited in claim 12, wherein the spark plug resistance element include x mass % ZrO.sub.2, y mass % ZnO, and z mass % SnO.sub.2, where 0<x<0.99*c, 0<y<c and 0<z<c, where c=20 to 100 mass %, relative in each case to a total mass of the spark plug resistance element, and x+y+z=c.

    26. The spark plug resistance element as recited in claim 12, wherein the spark plug resistance element include x mass % ZrO.sub.2, y mass % ZnO, and z mass % SnO.sub.2, where 0<x<0.99*c, 0<y<c and 0<z<c, where c=40 to 80 mass %, relative in each case to a total mass of the spark plug resistance element, and x+y+z=c.

    27. A spark plug, comprising: a spark plug resistance element including at least one inorganic amorphous oxide and at least one first inorganic crystalline oxide having a relative dielectric permittivity of at most 15.

    Description

    BRIEF DESCRIPTION OF THE DRAWINGS

    [0018] Below, exemplary embodiments of the present invention are described in detail with reference to the figures.

    [0019] FIG. 1 shows a partly sectional view of a spark plug according to a first specific embodiment of the present invention.

    [0020] FIG. 2 shows a schematic sectional view of a spark plug resistance element according to a second specific embodiment of the present invention.

    DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

    [0021] In the Figures, only the main features of the present invention are shown. All other features are omitted for clarity. In addition, identical reference characters designate identical components.

    [0022] As can be seen in FIG. 1, according to a first specific embodiment, spark plug 1 includes a ground electrode 2 and a center electrode 3. An insulator 4 is provided in such a way that center electrode 3 stands out somewhat from insulator 4, in a conventional manner. Insulator 4 itself is partly surrounded by a housing 5. Reference character 6 designates an electrical terminal screw. From electrical terminal screw 6, an electrically conductive connection is provided, via a terminal bolt 7 and a spark plug resistance element 8, to center electrode 3.

    [0023] Spark plug resistance element 8, shown in detail in FIG. 2, improves the electromagnetic compatibility of spark plug 1 while maintaining a good value for the electrical resistance and high mechanical stability. In this way, low electromagnetic radiation is also achieved for spark plug 1.

    [0024] FIG. 2 is a schematic sectional view of spark plug resistance element 8 of FIG. 1. Spark plug resistance element 8 includes at least one inorganic amorphous oxide 9 and at least one first inorganic crystalline oxide 10 having a relative dielectric permittivity of at most 15. Inorganic amorphous oxide 9 here forms a glass-type matrix in which first inorganic crystalline oxide 10 is embedded. First inorganic crystalline oxide 10 is in particular ZnO or SnO.sub.2 or a mixture thereof.

    [0025] In addition, spark plug resistance element 8 includes at least one second inorganic crystalline oxide 11, second inorganic crystalline oxide 11 being selected in particular from ZrO.sub.2, TiO.sub.2, HfO.sub.2, and mixtures thereof.

    [0026] Preferably, first inorganic crystalline oxide 10 is a mixture of ZnO and SnO.sub.2, second inorganic crystalline oxide 11 is ZrO.sub.2, and the mass portions of first inorganic crystalline oxide 10 and of second inorganic crystalline oxide 11 are as follows: x mass % ZrO.sub.2, y mass % ZnO, and z mass % SnO.sub.2, where 0<x<0.99*c, 0<y<c and 0<z<c, where c=20 to 100 mass %, in particular 40 to 80 mass %, relative in each case to the total mass of spark plug resistance element 8, and x+y+z=c.

    [0027] In addition, spark plug resistance element 8 includes at least one inorganic non-oxidic material 12, the inorganic non-oxidic material 12 being selected in particular from carbon black, graphite, carbide, metals, and mixtures thereof. The content of inorganic non-oxidic material 12 is here in particular greater than 0 to 20 mass % and in particular greater than 0 to 10 mass %, relative in each case to the total mass of spark plug resistance element 8.

    [0028] Spark plug resistance element 8 is distinguished by a very high electromagnetic compatibility, with good electrical resistance.