Sumoyama
Daisuke Sumoyama, Aichi JP
Patent application number | Description | Published |
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20110285270 | SPARK PLUG - A spark plug | 11-24-2011 |
Daisuke Sumoyama, Nagoya-Shi JP
Patent application number | Description | Published |
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20120217864 | SPARK PLUG - A spark plug having an insulator that can be restrained from cracking in an environment of heating and cooling cycles. The spark plug includes an insulator having an axial bore extending in the direction of the axis, and a center electrode held in one end portion of the axial bore. The center electrode has an outer layer, and a core provided within the outer layer and formed from a material higher in thermal conductivity than the outer layer. After a heat treatment, the outer layer has a high-hardness region having a hardness of 190 Hv or higher and a thickness of 30 μm to 200 μm, and an element supply region having a thickness of 50 μm or more. | 08-30-2012 |
20140097739 | SPARK PLUG - In a spark plug, at least either of a center electrode and a ground electrode has a tip which defines a gap, a tip provided on at least either of a center electrode and a ground electrode contains Ir, Rh and Ru in a total amount of 95 mass % or more with respect to the whole mass amount thereof, and the contents (Rh, Ru) of Rh and Ru (mass %) lie within an area which is surrounded by a line which connects point A (6, 1), point B (6, 15), point C (33, 18), point D (33, 4) and the point A (6, 1) in this order or lie on the line. The tip satisfies 1.5≦Has/Han≦2.2. | 04-10-2014 |
20140159564 | SPARK PLUG - A spark plug having a center electrode; a ground electrode provided so as to form a gap between the ground electrode and the center electrode; and a tip provided on at least one of a distal end portion of the ground electrode and a front end portion of the center electrode, the end portions facing each other, characterized in that the tip contains an element group M (M consists of at least one species of Pt and Rh) in an amount of 3 mass % to 35 mass %, and an element group L (L consists of at least one species of Ir, Ru, and Pd) in an amount of 0 mass % to 15 mass %; the total amount of the element group M and the element group L is at most 35 mass %; and the total amount of Ni, the element group M, and the element group L is at least 94 mass %. | 06-12-2014 |
Daisuke Sumoyama, Nagoya JP
Patent application number | Description | Published |
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20130026903 | SPARK PLUG - An electrode tip located at an distal end of an electrode of a spark plug comprises Pd as a predominant component in an amount of 40 wt. % or more; at least one element of Ir, Ni, Co, and Fe, wherein, when the tip contains Ir, the amount of Ir is 0.5 wt. % to 20 wt. %, and when the tip contains at least one element of Ni, Co, and Fe, the amount of the at least one element is 0.5 wt. % to 40 wt. %; and at least one element of Pt, Re, Rh, and Ru in a total amount of 5 wt. % to 40 wt. %, wherein when the tip contains at least one element of Re, Rh, and Ru, the amount of the at least one element is 10 wt. % or less, and when the tip contains Pt, the amount of Pt is 16 wt. % to 40 wt. %. The electrode tip, which comprises Pd as the main component, has improved resistance to spark-caused wear and reduced occurrence of separation and cracking of the tip. | 01-31-2013 |
20130069516 | SPARK PLUG - 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 θ | 03-21-2013 |