Spark plug and resistor material for spark plug

Patent metadata

Field	Value
Publication number	US-10811852-B2
Application number	US-201916571250-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Sep 17, 2018
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A spark plug includes a center electrode, a terminal fitting, and a resistor disposed between the center electrode and the terminal fitting. The resistor contains glass, a zirconia-based material and an electrically conducting material. The zirconia-based material contains at least stabilized zirconia.

First claim

What is claimed is:

1. A spark plug, comprising:
a center electrode;
a terminal fitting; and
a resistor disposed between the center electrode and the terminal fitting,
wherein the resistor contains glass, a zirconia-based material and an electrically conducting material,
the zirconia-based material contains at least stabilized zirconia, and
the stabilized zirconia contains at least one selected from an oxide of Y, an oxide of Ce, an oxide of Mg, an oxide of Ca and an oxide of Al in a solid solution state.

2. The spark plug according to claim 1 ,
wherein the zirconia-based material contains the stabilized zirconia of equal to or greater than 30 mass percentage.

3. The spark plug according to claim 1 ,
wherein the zirconia-based material consists of the stabilized zirconia.

4. A resistor material for a spark plug, comprising:
glass;
a zirconia-based material; and
an electrically conducting material,
wherein the zirconia-based material contains at least stabilized zirconia, and
the stabilized zirconia contains at least one selected from an oxide of Y, an oxide of Ce, an oxide of Mg, an oxide of Ca and an oxide of Al in a solid solution state.

5. The spark plug according to claim 1 , wherein the resistor contains electrically conducting material of greater than or equal to 0.5 mass percentage and less than or equal to 10 mass percentage.

6. The spark plug according to claim 5 , wherein the electrical conducting material is greater than or equal to 1 mass percentage and less than or equal to 7 mass percentage.

Assignees

• Denso Corp

Inventors

• Watanabe Tomoyuki

Classifications

• H01T13/41 Primary

  with interference suppressing or shielding means · CPC title

• H01C7/108 Primary

  Metal oxide · CPC title

• H01T13/34

  characterised by the mounting of electrodes in insulation, e.g. by embedding · CPC title

• H01T21/02

  of sparking plugs · CPC title

• H01T1/16

  Series resistor structurally associated with spark gap · CPC title