About 31 results
https://drivepatents.com/patents/975987 · 23 Apr 2014
In a spark plug including an electrode having a cover portion and a core portion, the occurrence of a gap between the cover portion and the core portion is suppressed. In a spark plug including a center electrode and a ground electrode that forms a gap bet...
https://drivepatents.com/patents/977351 · 19 Mar 2014
A management torque value smaller than a specified torque value is defined beforehand, and a screw ring-form, plug management gauge (11), which is capable of being screwed with plug (3), is prepared. Gauge (11) is provided with marked lines (14a, 14b) show...
https://drivepatents.com/patents/989931 · 12 Jun 2013
In process of threadably fitting a metal shell (50) having a surface formed with an Ni plated layer into a mounting hole (91), in a state where a gasket (60) made of stainless steel is uncompressed while being interposed between a protrusion part (54) and ...
https://drivepatents.com/patents/992357 · 20 Mar 2013
[Purpose] To secure the joint strength between a ground electrode and a metal shell even when a spark plug is reduced in diameter. [Solution] A spark plug 100 includes a center electrode 20, a ground electrode 30 formed of a metal material containing 95% o...
https://drivepatents.com/patents/986105 · 20 Feb 2013
A spark plug (1) includes a center electrode (5), a ground electrode (27), and a noble metal tip (32). The noble metal tip (32) is joined to at least one object member of the two electrodes (5) and (27) via a fusion zone (35). As viewed on a plane of proje...
https://drivepatents.com/patents/994492 · 2 Jan 2013
One object of the invention is to provide a plug cap that more reliably prevents the leakage of current by suppressing the ingress of water from a gap between a terminal body and a rubber member. A plug cap 1 includes an electrical connection portion 5 tha...
https://drivepatents.com/patents/994744 · 26 Dec 2012
Breakage of a center electrode, etc., is more reliably prevented, and the effect of improving ignition performance and durability associated with provision of a noble metal tip is sufficiently exhibited. A spark plug 1 includes a ceramic insulator 2, a cen...
https://drivepatents.com/patents/998986 · 29 Aug 2012
A spark plug (1) includes a tubular metallic shell (3) extending in the direction of an axis (CL1) and having a tool engagement portion (19) formed through extrusion. The tool engagement portion (19) has a 12-point shape which is a sectional shape taken or...
https://drivepatents.com/patents/1000022 · 25 Jul 2012
Disclosed is a spark plug having an insulator capable of achieving good breakage resistance by modifying the state of contact of the insulator with a plate packing and the like without increase in insulator thickness. A spark plug 1 contains a ceramic insu...
https://drivepatents.com/patents/1000280 · 18 Jul 2012
Problem is to enhance the welding strength when a projecting shape section is resistance-welded to a ground electrode. A ground electrode 30 includes a ground electrode base material 35 and a projecting shape section 36. The projecting shape section 36 is ...