公开(公告)号：US10886708B2

公开(公告)日：2021-01-05

申请号：US16584998

申请日：2019-09-27

Applicant: DENSO CORPORATION

Inventor： Shintaro Itoh ,  Daisuke Tanaka ,  Akimitsu Sugiura ,  Ryota Wakasugi ,  Kaori Doi ,  Kanechiyo Terada ,  Tetsuya Miwa ,  Fumiaki Aoki

IPC: H01T13/32 ,  H01T13/52

Abstract: A spark plug has a tubular ground electrode, an insulator, and a center electrode. The insulator has an insulator protruding portion protruding to a tip end side in a plug axial direction with respect to the ground electrode. The center electrode 4 has an exposed portion exposed through a tip end of the insulator protruding portion. The exposed portion of the center electrode has a first part covering the insulator protruding portion from the tip end side in the plug axial direction, and a second part extending from the first part to a base end side in the plug axial direction and covering the entire circumference of an outer peripheral surface of the insulator protruding portion from an outer peripheral side in a plug radial direction.