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公开(公告)号：US10790639B1
公开(公告)日：2020-09-29
申请号：US16834008
申请日：2020-03-30
发明人： Susumu Imai
摘要： A spark plug includes a tubular metallic shell having an attachment screw portion having an external thread. The attachment screw portion has a pitch diameter maximum portion at which the external thread has a maximum pitch diameter, the pitch diameter maximum portion being located on a rear end side of a center of the attachment screw portion in a direction along an axial line of the metallic shell, and a pitch diameter local maximum portion at which the external thread has a locally maximum pitch diameter, the pitch diameter local maximum portion being located on a forward end side of the pitch diameter maximum portion in the direction along the axial line.
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公开(公告)号：US10720759B2
公开(公告)日：2020-07-21
申请号：US16494331
申请日：2017-08-08
发明人： Susumu Imai
摘要： The spark plug includes an insulator, a metal shell, and a buffering member. The buffering member is filled in a space that is enclosed by an inner peripheral surface of the metal shell and an outer peripheral surface of the insulator. 3 mm2≤L×T is satisfied in a case where: a length in a direction of an axial line of a filled portion filled with the buffering member is defined as a filling length L; a thickness, of a screw portion of the metal shell, that is half a difference left after subtraction of the inner diameter of the metal shell from the pitch diameter of the screw portion is defined as an effective thickness; and a minimum value of the effective thickness of a portion, of the screw portion, present rearward of an inner diameter reduction portion of the metal shell is defined as a minimum thickness T.
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公开(公告)号：US11050221B2
公开(公告)日：2021-06-29
申请号：US16835393
申请日：2020-03-31
发明人： Susumu Imai
IPC分类号： H01T13/08
摘要： A spark plug includes a tubular metallic shell having an attachment screw portion having an external thread, an insulator disposed inside the metallic shell and having an axial hole, and a center electrode disposed in the axial hole. The attachment screw portion has a pitch diameter local maximum portion at which the external thread has a locally maximum pitch diameter. The pitch diameter local maximum portion is located on the forward end side of a rear end of the center electrode in a direction along an axial line of the metallic shell.
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公开(公告)号：US10680416B2
公开(公告)日：2020-06-09
申请号：US16481164
申请日：2017-12-11
发明人： Yusuke Tenkumo , Susumu Imai
IPC分类号： H01T13/20 , H01T21/02 , B23K26/0622 , B23K26/08 , B23K26/28 , B23K101/36 , H01T13/39
摘要： A tip is welded appropriately using an energy beam. The tip is welded to a base portion by irradiating the interface between the base portion and the tip with the energy beam. The welding the tip to the base portion includes: applying the energy beam continuously, while moving the irradiation position of the energy beam, in a first period of time; and applying the energy beam a plurality of times according to a pulsed output pattern, while moving the irradiation position of the energy beam, in a second period of time subsequent to the first period of time.
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公开(公告)号：US09882356B2
公开(公告)日：2018-01-30
申请号：US15453565
申请日：2017-03-08
发明人： Susumu Imai
摘要： A spark plug includes an insulator having an axial hole extending along an axial line, a center electrode disposed in the axial hole, a tubular metallic shell surrounding the insulator, a ground electrode whose proximal end is fixed to the metallic shell, and a cylindrical noble metal tip fixed to the ground electrode via an intermediate tip so as to form a gap between the noble metal tip and the center electrode. A weld portion is provided between the noble metal tip and the intermediate tip. The weld portion has a diameter larger than that of a portion of the intermediate tip which is adjacent to the weld portion. The noble metal tip is located inside a virtual tapered cylindrical surface which extends from a peripheral edge of a gap-side end of the center electrode so as to contact an outer circumferential edge of the weld portion.
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公开(公告)号：US08987981B2
公开(公告)日：2015-03-24
申请号：US14317564
申请日：2014-06-27
发明人： Susumu Imai
摘要： A sparkplug includes a ground electrode forming a gap with a front end surface of the center electrode. A front end portion of the ground electrode includes an opposed surface facing the center electrode, and a pair of tapered surfaces sandwiching the opposed surface. A shortest distance between the center electrode and a boundary formed by the opposed surface and the tapered surface is equal to or less than 1.2 times a distance of the gap. At least a part of a cross section of the core portion is disposed in a region at a front side of the straight line that passes a rear end of a line segment corresponding to the tapered surface and is vertical to the line segment. A shortest distance between the line segment and the cross section of the core portion is 0.2 mm or more and 1.5 mm or less.
摘要翻译： 火花塞包括与中心电极的前端面形成间隙的接地电极。 接地电极的前端部包括面对中心电极的相对面和夹着相对面的一对锥面。 中心电极与由相对面和锥面形成的边界之间的最短距离等于或小于间隙距离的1.2倍。 芯部的截面的至少一部分设置在直线的前侧的通过与锥形面对应的线段的后端并与线段垂直的区域。 线段与芯部的截面之间的最短距离为0.2mm以上且1.5mm以下。
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公开(公告)号：US11456578B2
公开(公告)日：2022-09-27
申请号：US17418030
申请日：2020-10-01
发明人： Koichiro Saito , Susumu Imai
摘要： A spark plug including a center electrode; a metallic member forming a tubular shape around an axis of the spark plug, holding the center electrode therein, and having a hole formed in a side wall thereof and extending in a radial direction; and a ground electrode supported in the hole and extending from the hole toward the axis. The ground electrode has a fixing portion formed of metal and fixed to the hole, and an ignition portion containing a noble metal, disposed on a side toward the axis in relation to the fixing portion, and having a discharge surface for forming a gap between the ignition portion and the center electrode. The absolute value of the difference in coefficient of thermal expansion between the metallic member and the fixing portion is smaller than the absolute value of the difference in coefficient of thermal expansion between the metallic member and the ignition portion.
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公开(公告)号：US10320158B2
公开(公告)日：2019-06-11
申请号：US15453565
申请日：2017-03-08
发明人： Susumu Imai
摘要： A spark plug includes an insulator having an axial hole extending along an axial line, a center electrode disposed in the axial hole, a tubular metallic shell surrounding the insulator, a ground electrode whose proximal end is fixed to the metallic shell, and a cylindrical noble metal tip fixed to the ground electrode via an intermediate tip so as to form a gap between the noble metal tip and the center electrode. A weld portion is provided between the noble metal tip and the intermediate tip. The weld portion has a diameter larger than that of a portion of the intermediate tip which is adjacent to the weld portion. The noble metal tip is located inside a virtual tapered cylindrical surface which extends from a peripheral edge of a gap-side end of the center electrode so as to contact an outer circumferential edge of the weld portion.
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