公开(公告)号：US09548592B2

公开(公告)日：2017-01-17

申请号：US14582801

申请日：2014-12-24

Applicant: NGK Spark Plug Co., LTD.

Inventor： Tadatoshi Fujino ,  Kenji Ban ,  Yuichi Yamada

IPC: H01T13/39 ,  H01T13/16 ,  H01T13/20

CPC classification number: H01T13/39 ,  H01T13/16 ,  H01T13/20

Abstract: A sparkplug includes: an insulator with an axial hole extending along an axial line; a metal shell covering the insulator; and a shelf part inside the metal shell. The insulator includes a second column part formed in the front end side of a tapering part. When a volume surrounded by a first plane that passes through the front end of the shelf part of the metal shell and is orthogonal to the axial line, a curved surface extending from an outer circumference of the second column part, and an outer circumferential surface of the insulator is defined as A, and a volume surrounded by the first plane, the curved surface, a second plane that passes through the front end of the metal shell and is orthogonal to the axial line, and the axial hole of the insulator is defined as B, a relational expression 0.9≦A/B≦2.4 is satisfied.

Abstract translation: 火花塞包括：具有沿轴线延伸的轴向孔的绝缘体; 覆盖绝缘体的金属壳; 和金属外壳内的搁板部分。 绝缘体包括形成在锥形部的前端侧的第二柱部。 当由第一平面包围的体积通过金属壳的搁架部分的前端并且与轴线正交时，从第二柱部分的外圆周延伸的弯曲表面和 绝缘体被定义为A，由第一平面，弯曲表面，穿过金属壳的前端并与轴线正交并与绝缘体正交的第二平面所围绕的体积和绝缘体的轴向孔被限定 作为B，满足关系式0.9≤A/B≤2.4。