# US 2023/0055431 A1 · Spark plug > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0055431 A1 - Document ID: US20230055431A1 - Status: Published application - Kind: A1 - Application number: 17/842,224 - Filed: 2022-06-16 - Published: 2023-02-23 - Earliest claimed: 2021-08-19 - Assignees: Hyundai Motor Company; Kia Corporation - Applicants: Hyundai Motor Company; Kia Corporation - Inventors: Kiseon Sim; Soo Hyung Woo - Web page: https://patentgrep.com/patent/US20230055431A1 ## CPC - H01T 13/22: having two or more electrodes embedded in insulation (sparking plugs having two or more spark gaps H01T13/46) - H01T 13/462: {in series connection} - F02P 3/04: Layout of circuits - H01T 13/32: characterised by features of the earthed electrode - H01T 13/41: with interference suppressing or shielding means - H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H) - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) ## Abstract A spark plug includes a metal body member formed of a metal material, an insulating body member provided inside the metal body member and formed of an insulating material, a pair of central electrodes provided inside the insulating body member and having different polarities, and a ground electrode extending from the metal body member between a pair of central electrodes. ## Claims ### Claim 1 A spark plug comprising: a metal body member formed of a metal material; an insulating body member positioned inside the metal body member and formed of an insulating material; a pair of central electrodes positioned inside the insulating body member and having different polarities; and a ground electrode extending from the metal body member between the pair of central electrodes; wherein the ground electrode includes: a ground vertical portion extending downward from a lower end portion of the metal body member; and a ground horizontal portion extending between the pair of central electrodes from the ground vertical portion; and wherein a distance between the positive electrode and the end of the ground electrode and a distance between the negative electrode and the end of the ground electrode is shorter than a distance between the positive electrode and the negative electrode. ### Claim 2 (depends on 1) The spark plug of claim 1, wherein the pair of central electrodes are positioned at a predetermined distance from each other at a center of a lower part of the insulating body member. ### Claim 3 (depends on 1) The spark plug of claim 1, wherein the pair of central electrodes includes a positive electrode and a negative electrode. ### Claim 4 (canceled) ### Claim 5 A spark plug comprising: a metal body member formed of a metal material, the metal body member having two ends; an insulating body member positioned inside the metal body member and formed of an insulating material; a pair of central electrodes positioned inside the insulating body member and having different polarities; and a ground electrode formed across the pair of central electrodes at both ends of the metal body member; wherein the ground electrode includes: a first ground vertical portion extending downward from one lower end of the metal body member; a second ground vertical portion extending downward from an other lower end of the metal body member; and a ground horizontal portion connecting the first ground vertical portion and the second ground vertical portion; and wherein a distance between the positive electrode and the ground horizontal portion and a distance between the negative electrode and the ground horizontal portion is shorter than a distance between the positive electrode and the negative electrode. ### Claim 6 (depends on 5) The spark plug of claim 5, wherein the pair of central electrodes are positioned at a predetermined distance from each other on a center of a lower part of the insulating body member. ### Claim 7 (depends on 5) The spark plug of claim 5, wherein the pair of central electrodes includes a positive electrode and a negative electrode. ### Claim 8 (canceled) ### Claim 9 A spark plug comprising: a metal body member formed of a metal material; an insulating body member positioned inside the metal body member and formed of an insulating material; a pair of central electrodes positioned inside the insulating body member and having different polarities; and a ground electrode formed across the pair of central electrodes from the metal body member; wherein the ground electrode includes: a ground vertical portion extending downward from a lower end portion of the metal body member; and a ground horizontal portion extending from the ground vertical portion by a predetermined length; and wherein a distance between the positive electrode and the ground horizontal portion and the distance between the negative electrode and the ground horizontal portion are formed to be shorter than the distance between the positive electrode and the negative electrode. ### Claim 10 (depends on 9) The spark plug of claim 9, wherein the pair of central electrodes are positioned at a predetermined distance from each other on the lower center of the insulating body member. ### Claim 11 (depends on 9) The spark plug of claim 9, wherein the pair of central electrodes include a positive electrode and a negative electrode. ### Claim 12 (canceled)