Patent application number | Description | Published |
20090009048 | SPARK PLUG - A spark plug ( | 01-08-2009 |
20120256530 | SPARK PLUG - A spark plug including a center electrode and a ground electrode having a core portion and an outer layer covering the core portion, the core portion being formed from a material having a thermal conductivity higher than that of the outer layer. At least a portion in which thickness of the outer layer is 0.5 mm or less is present at a cross-section perpendicular to a direction in which the ground electrode is extended. Further, the composition of the electrode material forming the outer layer is as follows: Ni is 96 mass % or more, total of at least one kind selected from Y and rare earth elements is 0.05 mass % or more, Al is 0.5 mass % or less, and Si is 0.5 mass % or more and 1.5 mass % or less, where the total of Ni, Y, rare earth elements, Al, Si does not exceed 100 mass %. | 10-11-2012 |
20120293061 | SPARK PLUG - A spark plug including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode, the ground electrode has an outer layer which is formed from an Ni-based alloy and a core portion which is covered by the outer layer and formed from a material having a thermal conductivity higher than that of the outer layer. Further, the melting point of the Ni-based alloy forming the outer layer is 1150° C. or more and 1350° C. or less. | 11-22-2012 |
20130009538 | SPARK PLUG - A spark plug ( | 01-10-2013 |
20130088139 | SPARK PLUG - A spark plug which exhibits improved resistance to high-temperature oxidation of an electrode, and improved resistance to spark-induced erosion of, improved resistance to oxidation of, and improved joining reliability of a tip joined to the electrode. A spark plug has spark members; each of the spark members has a weight of 1.5 mg or more; and a center electrode and a ground electrode contain Ni as a main component, C in an amount of 0.005% by mass to 0.10% by mass, Si in an amount of 1.05% by mass to 3.0% by mass, Mn in an amount of 2.0% by mass or less, Cr in an amount of 20% by mass to 32% by mass, and Fe in an amount of 6% by mass to 16% by mass. | 04-11-2013 |
20130293088 | SPARK PLUG - It is an object of the present invention to provide a spark plug having a ground electrode joined securely by electric resistance welding. The spark plug includes a cylindrical metal shell and a ground electrode joined by electric resistance welding to an end portion of the metal shell. The metal shell has a high hardness region formed with a Vickers hardness of 3×10 | 11-07-2013 |
20130313962 | SPARK PLUG - A spark plug including a center electrode; an insulator; a metallic shell; and a ground electrode, wherein at least one of the center electrode and the ground electrode has thereon an intermediate member which connects the center electrode or the ground electrode to a noble metal tip. The intermediate member has a tip-bonding portion to which the noble metal tip is bonded, and an electrode-bonding portion which has a diameter greater than that of the tip-bonding portion, and which is bonded to the center electrode or the ground electrode. The intermediate member contains nickel (Ni) as a main component, and also contains chromium (Cr) in an amount of 15 to 25 wt. %. The intermediate member contains, in a surface portion thereof, silicon (Si) in an amount per unit volume of 0.04 mg/mm | 11-28-2013 |
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 |