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公开(公告)号：US10530132B2
公开(公告)日：2020-01-07
申请号：US16381089
申请日：2019-04-11
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Ryuichi Ohno
摘要： A spark plug includes: a cylindrical mounting bracket attachable to an internal combustion engine; a center electrode that is held by the mounting bracket in an insulated manner and has a first end portion exposed and extended from a first end portion of the mounting bracket; a ground electrode that has a first end side joined to the first end portion of the mounting bracket and has a surface of the second end side extended to be opposed to the first end portion of the center electrode; a convex portion that protrudes from a base material of the ground electrode on the surface of the ground electrode toward the center electrode, has a surface protruded outward, and has surfaces without corners; and a precious metal layer formed on the surface of the convex portion.
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公开(公告)号：US10541517B2
公开(公告)日：2020-01-21
申请号：US16381099
申请日：2019-04-11
申请人： DENSO CORPORATION
发明人： Kenji Hattori , Teiji Ishinada , Ryuichi Ohno
摘要： A spark plug includes: a mounting bracket; a center electrode having a first end portion exposed and extended from first end portion of the mounting bracket; a slant-shape ground electrode that has first end side joined to the first end portion of the mounting bracket, has a surface of the second end side extended to be opposed to the first end portion of the center electrode, and has an extension direction inclined with respect to the center electrode; a convex portion protruding from a base material of the ground electrode on the surface thereof toward the center electrode, inclines toward the center electrode with respect to a protrusion direction, and has a convex portion opposed surface opposed to an end surface of the center electrode; and a precious metal layer formed on at least the convex portion opposed surface out of surfaces of the convex portion.
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公开(公告)号：US10431960B2
公开(公告)日：2019-10-01
申请号：US16088976
申请日：2017-03-24
申请人： DENSO CORPORATION
发明人： Ryuichi Ohno , Ryohei Akiyoshi
摘要： A spark plug for an internal combustion engine includes a cylindrical housing, a cylindrical insulator, a center electrode, and a ground electrode. The ground electrode includes an upright part and an inclined part. The upright part is a portion vertically provided on a tip end part of the housing to a tip end side. The inclined part is a portion that is bent from the tip of the upright part toward the center electrode side, and is extended toward an oblique tip end side. The inclined part has a ground end face, an opposed face, and a corner curved face. The corner curved face is a face that smoothly connects the ground end face and the opposed face. The corner curved face has a curved shape. The curvature radius R of the corner curved face satisfies 0.3 mm≤R≤0.7 mm. The inclination angle θ of the inclined part with respect to a plug axial direction (Z) satisfies 30°≤θ≤60°.
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公开(公告)号：US09948067B2
公开(公告)日：2018-04-17
申请号：US15695232
申请日：2017-09-05
申请人： DENSO CORPORATION
发明人： Masamichi Shibata , Ryuichi Ohno , Kenji Hattori
摘要： A spark plug for an internal combustion engine includes a cylindrical metal shell, a center electrode, and a ground electrode. The center electrode has an end portion which protrudes outside an end of the metal shell. The ground electrode is joined at an end thereof to the metal shell and has an inner surface facing the end portion of the center electrode. The ground electrode has a maximum width W meeting a relation of 1.3≤W≤2.0. A distance d between the center of an end surface of the center electrode and the inner surface of the ground electrode on a plane extending through the center of the center electrode perpendicular to an axis of the spark plug is selected to meet a relation of W+0.525≤d≤1.07W+0.66. This ensures the stability of ignitability of the spark plug.
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公开(公告)号：US10348060B2
公开(公告)日：2019-07-09
申请号：US15687854
申请日：2017-08-28
申请人： DENSO CORPORATION
发明人： Tomoyuki Watanabe , Ryohei Akiyoshi , Ryuichi Ohno
IPC分类号： H01T13/32
摘要： When one of a center chip and a ground chip of a spark plug is defined as a first chip and another one is defined as a second chip, a discharge starting ridge line, which is a straight ridge line that forms a boundary between two surfaces having different normal line directions, is formed in a portion closest to the second chip in the first chips, and a distance from the discharge starting ridge line to the second chip is configured to be equal at a portion where the first chip and the second chip are opposed to each other.
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