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公开(公告)号：US11424599B2
公开(公告)日：2022-08-23
申请号：US16973599
申请日：2020-03-19
发明人： Yusuke Tanahashi , Naoki Nishio , Yusuke Kawashima
IPC分类号： H01T13/34
摘要： A spark plug including a center electrode that has a large-diameter portion having an outside diameter that is largest in the center electrode. The large-diameter portion is retained at a rear facing surface in an axial hole of an insulator. A metal shell has a diameter increased portion on a rear end side with respect to the center electrode, the diameter increased portion having an inside diameter that is increased toward the rear end side. The insulator has a first portion which is a portion of the insulator in a region from a rear end of the rear facing surface to a front end of the diameter increased portion. The first portion has a thickness that is the largest in the region, and is disposed at least on an outer periphery of the large-diameter portion.
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公开(公告)号：US10978856B1
公开(公告)日：2021-04-13
申请号：US17067992
申请日：2020-10-12
发明人： Yusuke Tanahashi , Naoki Nishio
IPC分类号： H01T13/36
摘要： A spark plug including a cylindrical insulator having a step portion; a center electrode provided in an axial hole of the insulator; and a cylindrical metal shell having a ledge portion, the metal shell holding the insulator from an outer circumferential side in a state in which the step portion is engaged with the ledge portion via a packing, wherein a recess is formed on a part contacting with the packing, of one of the step portion and the ledge portion, and a projection which at least partially overlaps the recess in the axial-line direction is formed on a part contacting with the packing, of the other of the step portion and the ledge portion.
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公开(公告)号：US10958044B1
公开(公告)日：2021-03-23
申请号：US17038401
申请日：2020-09-30
发明人： Yusuke Kawashima , Naoki Nishio , Yusuke Tanahashi
摘要： In the spark plug, an insulator is held by a metal shell via a packing. The packing includes a base material and a metal layer formed on a surface of the base material. In a cross section including the axial line, of distances between end points of the metal layer on a first contact surface of the insulator that contacts with the metal layer and first points which are intersections of the first contact surface and first perpendiculars extending to the first contact surface from first corners at which a first surface and third surfaces of the base material intersect each other is longer than a thickness of the metal layer at a middle position on the third surface that corresponds to half a length measured along the third surface.
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