Patent ID: 6335587
Filing Date: 2002-01-01
Classification: H01T

Abstract:
A spark plug comprising:a porcelain insulator having a central through-hole; a central electrode held in said central through-hole, said central electrode having a distal end provided with an anti-spark consumption member; a metal shell holding said porcelain insulator; and a plurality of ground electrodes, each having an end face, and each ground electrode having electrical continuity to said metal shell, said plurality of ground electrodes forming a spark discharge gap from the distal end portion of said central electrode; wherein a shortest distance from the end face of each ground electrode to the porcelain insulator is smaller than said spark discharge gap; and said distal end of said central electrode projects from an end face of said porcelain insulator; and said central electrode comprises a central electrode matrix in a plane coextensive with the end face of said porcelain insulator.