| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 313135000 | With particular connector structure | 14 |
| 20090102346 | SEALING MEMBER FOR SPARK PLUG - A sealing member for a cylindrical spark plug having a metal shell with threaded ridges thereon to be screwed into a mounting hole of a combustion engine, the sealing member comprised of a piece of annular sheet material made of austenitic stainless steel or ferritic stainless steel that is folded back in a radial direction so as to form a region where at least two or more layers of the sheet material are overlapped in an axial direction | 04-23-2009 |
| 20110193468 | SPARK PLUG FOR A MODEL ENGINE - A spark plug for a model engine includes a main body. The main body has a through hole at a central portion thereof and an engaging portion disposed at a first end of the through hole to position a central electrode. The central electrode includes a connection portion at one end thereof and an extension portion at an opposing end thereof. The connection portion is protruded from the first end of the through hole. The extension portion is axially disposed in the through hole and connected with an ignition coil. One part of the through hole of the main body, close to the extension portion, is gradually enlarged towards a second end of the through hole to form an enlarged opening. The gas in the enlarged opening can be burned in an enlarged way and diffused in the cylinder of the model engine entirely, providing a complete combustion effect to enhance the horsepower of the model engine and stabilize the idle speed. | 08-11-2011 |
| 20110254428 | SPARK PLUG - [Objective] To provide a spark plug which is configured such that an insulation member, from which a center electrode projects, is pressed frontward and held in a metallic shell, and is fixed by means of crimping the rear end of the metallic shell, and which can prevent a drop in gas tightness between the metallic shell and the insulation member due to a difference in thermal expansion therebetween. | 10-20-2011 |
| 20110273074 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug for an internal combustion engine capable of ensuring sufficient gastightness of a combustion chamber and meeting demand for a reduction in diameter. | 11-10-2011 |
| 20120126681 | HIGH-FREQUENCY PLASMA SPARK PLUG - High-frequency plasma spark plug includes an insulator which has an axial hole extending in the axis direction, a center electrode inserted into a distal end side of the axial hole, a terminal electrode inserted into a rear end side of the axial hole, and being electrically connected to the center electrode, and a cylindrical main fitting mounted on an outer periphery of the insulator. With respect to a coaxial cable, the inner conductor is connected to the terminal electrode and the outer conductor is connected to the main fitting. High frequency power generated by a predetermined high-frequency power source is supplied via the coaxial cable thus generating high frequency plasma. The main fitting includes a large diameter portion which bulges radially outward and a connection portion which is brought into contact with the outer conductor. | 05-24-2012 |
| 20130134857 | SPARK PLUG - A spark plug comprises an insulator and a metal shell. The insulator includes a nose length portion at the forward end, and a tapered portion, extending from the rear end of the nose length portion toward the rear end of the insulator, increased in diameter toward the rear end. The metal shell includes a shoulder portion, protruding inward and having a retaining surface by which the tapered portion is retained, and a male thread portion on the outer peripheral side of the shoulder portion, and the thread diameter of the male thread portion is set to M | 05-30-2013 |
| 20130140975 | SPARK PLUG - A spark plug having excellent load life performance even when the spark plug receives an impact or vibration. The spark plug includes an accommodated portion of a metallic terminal, which is accommodated in an axial hole of an insulator, having a plurality of bent portions formed as a result of proper bending of the accommodated portion. The bent portions are in close vicinity to an inner circumferential surface of the insulator at three or more locations, and are present without localizing in the radial direction of the axial hole. | 06-06-2013 |
| 20140070691 | SPARK PLUG - A spark plug includes a tubular insulator and a tubular metal shell secured to an outer peripheral surface of the insulator by crimping. The tubular metal shell includes: an inner peripheral surface where powder for sealing is filled between the outer peripheral surface and the inner peripheral surface; a tool engagement portion overhanging in a polygonal shape; and a crimped lid disposed at an end portion of the metal shell coupled to the tool engagement portion, the end portion being bent toward the outer peripheral surface of the insulator by crimping. A relationship between a length L and a thickness t satisfies 2.50≦L/t≦3.10, the length L being a length along a shape of the crimped lid from the tool engagement portion to the insulator in a planar surface that passes through the axis, the thickness t being a thickness at an intermediate portion of the crimped lid. | 03-13-2014 |
| 20150061485 | SPARK PLUG - A spark plug includes an insulator having an axial hole, a metal terminal member having an insert portion and a depression formation zone existing on the insert portion and having depressions, and a metallic shell. The spark plug satisfies the following conditions: (1) the insert portion has a length H of 35 mm or more; (2) the depression formation zone has a length F of 13 mm or more; (3) the insert portion has a smooth surface zone on its outer circumferential surface; (4) the ratio (A/B) between diameter A of a forward end of the insert portion and inside diameter B of the insulator measured at the forward end satisfies the relational expression 0.9≦A/B≦0.98; and (5) Vickers hardness of the insert portion measured at the center of a cross section of the insert portion is 150 Hv or more to 350 Hv or less. | 03-05-2015 |
| 20150091433 | SPARK PLUG HAVING IMPROVED GROUND ELECTRODE ORIENTATION AND METHOD OF FORMING - A spark plug ( | 04-02-2015 |
| 20150349498 | SPARK PLUG - A spark plug including an insulator having an axial hole, a center electrode held at one end side and a terminal electrode held at the other end side of the axial hole, an electrical connection portion electrically connecting the center electrode and the terminal electrode inside the axial hole, wherein the electrical connection portion includes a conductor including a ceramic phase and a metal wire having a spiral structure portion, wherein the metal wire has a wire diameter of 0.1 mm or greater and 0.5 mm or smaller, and wherein the spiral structure portion of the metal wire is configured such that an outer diameter thereof is 1.0 mm or greater and 3 mm or smaller, a pitch thereof is 0.3 mm or greater and 1 mm or smaller, and a height thereof is 8 mm or greater and 30 mm or smaller. | 12-03-2015 |
| 20160006220 | SPARK PLUG - A spark plug includes a housing, an insulator inside the housing, a center electrode inside the insulator, and a connecting pin inside the insulator. At least one fillet is formed at a change of cross section at the housing, at the insulator, at the center electrode, and/or at the connecting pin. The fillet, viewed in cross section, includes a first leg and a second leg at an angle to the first leg. The length of the first leg is greater than the length of the second leg. | 01-07-2016 |
| 20160049772 | SPARK PLUG HAVING IMPROVED GROUND ELECTRODE ORIENTATION AND METHOD OF FORMING - A spark plug ( | 02-18-2016 |
| 20160087410 | SPARK PLUG - A spark plug having an insulator that includes a first portion which accommodates a front end of the metallic terminal. A portion of the metallic terminal has a roughened surface portion with a Vickers hardness of 200 Hv or greater and 320 Hv or smaller. A first ratio of an outside diameter of the roughened surface corresponding to at least a part of the first portion of the insulator to the first bore diameter of the insulator is 0.90 or greater. A second ratio of the first bore diameter to the second bore diameter of the insulator is 0.80 or greater and 0.98 or smaller. | 03-24-2016 |
