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公开(公告)号：US08841826B2
公开(公告)日：2014-09-23
申请号：US13578175
申请日：2010-11-26
申请人： Yuji Kasuya , Kenji Ban
发明人： Yuji Kasuya , Kenji Ban
摘要： A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle θ1 formed by a straight line L1 and a straight line L2 satisfies the relational expression θ1≦72°.
摘要翻译： 火花塞包括陶瓷绝缘体，中心电极，金属壳和接地电极。 中心电极在前端部具有相对于轴向向前变细的肩部。 贵金属端头通过熔接区域与中心电极的前端部接合。 在贵金属端头和接地电极之间形成火花放电间隙。 熔融区与贵金属端头的前端表面之间的最短距离为0.8-1.2mm。 在熔融区的前端处测量的熔融区的外径小于在熔融区的后端测量的外径。 由直线L1和直线L2形成的锐角和角度1满足关系式：1＆nlE; 72°。
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公开(公告)号：US09000658B2
公开(公告)日：2015-04-07
申请号：US12937231
申请日：2009-04-03
申请人： Iwao Kunitomo , Kenji Ban
发明人： Iwao Kunitomo , Kenji Ban
摘要： A spark plug in which a front end portion of a ground electrode is positioned outside of a virtual outer circumferential face that is formed by extending a front and outer circumferential face of a center electrode in the axis direction, and positioned on a front end side in the axis direction with respect to a virtual face including a front end face of the center electrode. Further, the equation 1.1≦b/a≦1.6 is satisfied, where “a” (mm) represents a first minimal distance between the front end portion of the center electrode and the front end portion of the ground electrode and, where “b” (mm) represents a second minimal distance between the front end portion of a ceramic insulator and the front end portion of the ground electrode.
摘要翻译： 一种火花塞，其中接地电极的前端部位于通过使中心电极的前外周面沿轴向延伸而形成的假想外周面的外侧，位于前端侧 相对于包括中心电极的前端面的虚拟面的轴方向。 此外，满足方程式1.1＆nlE; b / a＆nlE; 1.6，其中“a”（mm）表示中心电极的前端部分和接地电极的前端部分之间的第一最小距离，并且其中“b “（mm）表示陶瓷绝缘体的前端部和接地电极的前端部之间的第二最小距离。
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公开(公告)号：US20120313503A1
公开(公告)日：2012-12-13
申请号：US13578175
申请日：2010-11-26
申请人： Yuji Kasuya , Kenji Ban
发明人： Yuji Kasuya , Kenji Ban
IPC分类号： H01T13/20
摘要： A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle θ1 formed by a straight line L1 and a straight line L2 satisfies the relational expression θ1≦72°.
摘要翻译： 火花塞包括陶瓷绝缘体，中心电极，金属壳和接地电极。 中心电极在前端部具有相对于轴向向前变细的肩部。 贵金属端头通过熔接区域与中心电极的前端部接合。 在贵金属端头和接地电极之间形成火花放电间隙。 熔融区与贵金属端头的前端表面之间的最短距离为0.8-1.2mm。 在熔融区的前端处测量的熔融区的外径小于在熔融区的后端测量的外径。 由直线L1和直线L2形成的锐角和角度1满足关系式：1＆nlE; 72°。
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公开(公告)号：US20110025186A1
公开(公告)日：2011-02-03
申请号：US12937231
申请日：2009-04-03
申请人： Iwao Kunitomo , Kenji Ban
发明人： Iwao Kunitomo , Kenji Ban
IPC分类号： H01T13/32
摘要： A spark plug in which a front end portion of a ground electrode is positioned outside of a virtual outer circumferential face that is formed by extending a front and outer circumferential face of a center electrode in the axis direction, and positioned on a front end side in the axis direction with respect to a virtual face including a front end face of the center electrode. Further, the equation 1.1≦b/a≦1.6 is satisfied, where “a” (mm) represents a first minimal distance between the front end portion of the center electrode and the front end portion of the ground electrode and, where “b” (mm) represents a second minimal distance between the front end portion of a ceramic insulator and the front end portion of the ground electrode.
摘要翻译： 一种火花塞，其中接地电极的前端部位于通过使中心电极的前外周面沿轴向延伸而形成的假想外周面的外侧，位于前端侧 相对于包括中心电极的前端面的虚拟面的轴方向。 此外，满足方程式1.1＆nlE; b / a＆nlE; 1.6，其中“a”（mm）表示中心电极的前端部分和接地电极的前端部分之间的第一最小距离，并且其中“b “（mm）表示陶瓷绝缘体的前端部和接地电极的前端部之间的第二最小距离。
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