Patent ID: 9735552
Date: 2017-08-15
CPC Classifications: H01T

Claim:
1. A spark plug comprising: an insulator having an axial hole extending in an axial direction; a cylindrical conductive member disposed around the insulator; a center electrode disposed inside the axial hole of the insulator, having a bar shape extending in the axial direction, and located on a rear end side with respect to a front end of the conductive member; a ground electrode forming a spark gap between the ground electrode and the center electrode; and a connection part including a plurality of spokes extending in a radial direction of an axis whose inner ends are connected to an outer surface of the ground electrode, and connecting the conductive member to the ground electrode, wherein the connection part includes a joint part that is jointed to an inner surface of the conductive member, the ground electrode has at least one of a notch and a groove on the outer surface thereof at a position that is different from a position connected to the plurality of spokes in a circumferential direction of the axis, and the ground electrode has a cylindrical part that continuously extends over an entire circumference in the circumferential direction.