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公开(公告)号：US09716370B2
公开(公告)日：2017-07-25
申请号：US15168696
申请日：2016-05-31
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Naofumi Yamamura , Kuniyuki Ishii , Naoya Onoda , Hiroyuki Odo
Abstract: A spark plug includes a metal shell, an insulator, a center electrode, and a ground electrode. At least one of the center electrode and the ground electrode includes a projection having a columnar shape. The projection projects toward the other of the center electrode and the ground electrode and forms the discharge gap. A portion of a side surface of the projection has a recess. A melted portion is formed by melting the noble metal tip and an electrode base material. The recess is formed in the melted portion. When D is a depth of the recess from a side surface of the noble metal tip and R is a diameter of the noble metal tip, 0.05 mm≦D≦0.3×R is satisfied.
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公开(公告)号：US20140210336A1
公开(公告)日：2014-07-31
申请号：US14154215
申请日：2014-01-14
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Tatsunori Yamada , Naofumi Yamamura , Kenji Ban
Abstract: An ignition plug that reliably restrains generation of corona discharge for enhancing accuracy in detection of ionic current and method of manufacturing same. The ignition plug is configured such that a metallic shell and an insulator are fixed together by means of a crimped portion provided at a rear end portion of the metallic shell and bent radially inward. An electrically insulative filling member fills a space formed between the crimped portion and the insulator. The filling member covers at least a portion of an outer circumferential surface of a rear trunk portion of the insulator along the entire circumference and the entirety of a rear end surface of the metallic shell, which is a portion of the outer surface of the crimped portion and is visible from the rear side with respect to the direction of an axial line CL1.
Abstract translation: 一种可靠地抑制电晕放电产生以提高离子电流检测精度的火花塞及其制造方法。 火花塞被构造成使得金属壳和绝缘体通过设置在金属壳的后端部并径向向内弯曲的卷曲部分固定在一起。 电绝缘填充构件填充形成在压接部分和绝缘体之间的空间。 填充构件覆盖绝缘子的后主体部分的外周面的至少一部分沿着整个圆周和金属壳的后端表面的整体，该后端表面是卷曲部分的外表面的一部分 并且从相对于轴线CL1的方向的后侧可见。
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公开(公告)号：US08853930B2
公开(公告)日：2014-10-07
申请号：US14154215
申请日：2014-01-14
Applicant: NGK Spark Plug Co., Ltd.
Inventor： Tatsunori Yamada , Naofumi Yamamura , Kenji Ban
Abstract: An ignition plug that reliably restrains generation of corona discharge for enhancing accuracy in detection of ionic current and method of manufacturing same. The ignition plug is configured such that a metallic shell and an insulator are fixed together by means of a crimped portion provided at a rear end portion of the metallic shell and bent radially inward. An electrically insulative filling member fills a space formed between the crimped portion and the insulator. The filling member covers at least a portion of an outer circumferential surface of a rear trunk portion of the insulator along the entire circumference and the entirety of a rear end surface of the metallic shell, which is a portion of the outer surface of the crimped portion and is visible from the rear side with respect to the direction of an axial line CL1.
Abstract translation: 一种可靠地抑制电晕放电产生以提高离子电流检测精度的火花塞及其制造方法。 火花塞被构造成使得金属壳和绝缘体通过设置在金属壳的后端部并径向向内弯曲的卷曲部分固定在一起。 电绝缘填充构件填充形成在压接部分和绝缘体之间的空间。 填充构件覆盖绝缘子的后主体部分的外周面的至少一部分沿着整个圆周和金属壳的后端表面的整体，该后端表面是卷曲部分的外表面的一部分 并且从相对于轴线CL1的方向的后侧可见。
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