Spark plug
AssigneeNgk Spark Plug Co., Ltd.
InventorDaisuke Mishima
Life of this patent
Estimating the term…
Abstract
The spark plug includes: an insulator having an axial hole extending in an axial direction; a center electrode disposed at a front end in the axial direction of the axial hole and having a front end portion that protrudes from a front side of the axial hole; a tubular metal shell holding the insulator; and a ground electrode having one end portion that is fixed to a through hole provided in the metal shell, the ground electrode having another end portion that forms a discharge gap between the other end portion and the front end portion of the center electrode. The through hole extends toward the front side in the axial direction, in a direction from an outer peripheral surface toward an inner peripheral surface of the metal shell. The one end portion is located on a rear side relative to the other end portion in the axial direction.
Claims4
A spark plug comprising:
- an insulator in which an axial hole extending in an axial line direction is formed;
- a center electrode disposed at a front end in the axial line direction of the axial hole and having a front end portion that protrudes from a front side of the axial hole;
- a tubular metal shell holding the insulator;
- and
- a ground electrode having one end portion that is fixed to a through hole provided in the metal shell, the ground electrode further having another end portion that forms a discharge gap between the other end portion and the front end portion of the center electrode, wherein
- the through hole extends toward the front side in the axial line direction, in a direction from an outer peripheral surface toward an inner peripheral surface of the metal shell, and
- the one end portion is located on a rear side relative to the other end portion in the axial line direction.
Dependencies are inferred from the claim text.