NGK Spark Plug Co.

Komaki, Japan

NGK Spark Plug Co.

Komaki, Japan
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Patent
Ngk Spark Plug Co. | Date: 2016-11-14

A wiring substrate includes: a substrate body made from ceramic, having a front surface and a rear surface, and having a through hole penetrating between the front surface and the rear surface; and a heatsink inserted into the through hole. A step portion protruding in a direction perpendicular to an axial direction of the through hole, is formed over an entire periphery on an inner wall surface of the through hole of the substrate body. A flange opposed to the step portion is provided so as to protrude, over an entire periphery on a side surface of the heatsink. A stress relaxing ring is arranged over an entire periphery between the step portion and a joining surface opposed to the step portion. A brazing material is provided between the ring, and the joining surface and the step portion.


Provided is a lead-free piezoelectric ceramic composition having high piezoelectric properties. The lead-free piezoelectric ceramic composition fulfils a molar ratio (Na/K) for Na (sodium) and K (potassium) in the main phase thereof of 0.40 < (Na/K) < 3.0. In addition, the main phase has a crystal structure wherein (i) a first spot group corresponding to a basic grating cycle and (ii) a second spot group, corresponding to the twice the grating cycle of the basic grating cycle and being weaker than the first spot group, appear in an electron beam diffraction image obtained by using a transmission electron microscope and by having an electron beam incident from the <100> direction when the main phase is expressed as a pseudo cubic crystal.


Patent
NGK Spark Plug Co. | Date: 2017-01-25

A method for manufacturing a spark plug comprising the steps of: placing an assembly of the center electrode, an insulator, and a metal shell in a pressure resistant vessel and determining whether or not the insulator has a defect by applying a voltage to the center electrode, and bending the ground electrode toward the center electrode after the defect inspection step, the defect inspection step being performed while a pressure in the pressure resistant vessel is changed to a plurality of different pressures.


Patent
NGK Spark Plug Co. | Date: 2017-03-29

A spark plug 1 includes an insulator 3, a center electrode 4, a metallic shell 7, and a ground electrode 8. The insulator contains not less than 90.0 mass% and not greater than 98.1 mass% of Al_(2)O_(3) with respect to a total mass of elements, as reduced to oxides, contained in the insulator, and has a porosity not greater than 5%. Assuming that a porosity of the insulator after a heat treatment is B, a difference (B-A) of the porosities before and after the heat treatment is not greater than 3.5%. In the heat treatment, the insulator is placed in a furnace, and a temperature in the furnace is increased from a room temperature to 1400C at a temperature increase rate of 7C/min and is held at 1400C for 30 minutes, and thereafter, the temperature is decreased from 1400C to 400C at a temperature decrease rate of 10C or less per 5 minutes and is decreased to the room temperature.


Patent
NGK Sparkplug Co. | Date: 2017-01-04

An object of the present invention is to provide a spark plug which includes, at at least one of a center electrode and a ground electrode, a tip having excellent spark wear resistance in a high temperature environment, thereby having excellent durability. A spark plug includes a center electrode and a ground electrode disposed with a gap provided between the center electrode and the ground electrode. At least one of the center electrode and the ground electrode includes a tip which defines the gap. The tip includes a metal base material containing Ir as a main component, and oxide particles containing at least one of oxides having a perovskite structure represented by general formula ABO_(3) (A is at least one element selected from elements in group 2 in a periodic table, and B is at least one element selected from metal elements). When a cross section of the tip is observed, an area proportion of the oxide particles is not lower than 1% and not higher than 13%.


Patent
NGK Spark Plug Co. | Date: 2017-03-29

A spark plug includes an insulator made of an alumina sintered body containing Al_(2)O_(3) as a principal component and additional components including; an Si component, a Ba component, an Mg component, a Ca component, an Sr component, and a rare earth element component. When the additional components are expressed as oxides including R_(SiO2), R_(BaO), R_(MgO), R_(CaO), R_(SrO), and R_(RE2O3), contents (mass %) of the sub-component satisfy expressions (1) to (6) as follows: (1) 1.0 R_(SiO2) 5.0; (2) 0.5 R_(BaO) 5.0; (3) 0 R_(MgO) 0.18; (4) 0 R_(MgO)/R_(BaO) 0.36; (5) 0.3 (R_(MgO)+R_(CaO)+R_(SrO)) 1.8; and (6) 0 R_(RE2O3) 0.1.


Provided is a lead-free piezoelectric ceramic composition having high piezoelectric properties. The lead-free piezoelectric ceramic composition fulfils a molar ratio (Na/K) for Na (sodium) and K (potassium) in the main phase thereof of 0.40 < (Na/K) < 3.0. In addition, the main phase has a crystal structure wherein (i) a first spot group corresponding to a basic grating cycle and (ii) a second spot group, corresponding to the twice the grating cycle of the basic grating cycle and being weaker than the first spot group, appear in an electron beam diffraction image obtained by using a transmission electron microscope and by having an electron beam incident from the <100> direction when the main phase is expressed as a pseudo cubic crystal. The area ratio of the crystal phase reflecting the second spot group in the main phase is no more than 33% and the maximum particle diameter of the crystals reflecting the second spot group in the main phase is no more than 25 nm.


Patent
NGK Spark Plug Co. | Date: 2017-09-20

An ignition plug includes an insulator that includes a through hole; a center electrode; a metal shell that holds the insulator; a bar-shaped ground electrode body 31; an electrode tip 39 that is disposed along a side surface of the ground electrode body opposing a discharge surface of the center electrode; and a welding portion 35 that is disposed between the ground electrode tip and the ground electrode body. Over a sub-range RA2 which is 1/4 of a range RA1 from a first end P1 to a second end 392 of the ground electrode tip, a length L1 of the ground electrode tip and a length L2 of the welding portion in a direction perpendicular to a direction D1 satisfy (L2/L1) 0.25.


Patent
NGK Spark Plug Co. | Date: 2017-09-27

An ignition system that uses a technique capable of restraining radiation of noise caused by discharge of a spark plug in the ignition system. The ignition system includes a spark plug (10) and a power supply section. The spark plug (10) is attached to an engine head (20). The power supply section has a battery having a ground terminal, and an ignition coil which transforms a voltage of the battery and supplies a transformed voltage to the spark plug. In the ignition system, a metallic shell (130) of the spark plug (10) is fixed to the engine head (20) while being electrically insulated from the engine head through an insulator (22); an electrically conductive path (40) is connected to the metallic shell (130); and the electrically conductive path (40) is electrically connected to the ground terminal of the battery while being electrically insulated from the engine head (20).


The present application relates to laser welding methods, wherein an irradiation with a laser beam is started at a welding start position of two members that are stacked together, and the output of the laser beam is set so that spatter is not generated. After the start of the irradiation, the output of the laser beam is gradually increased so that a penetration depth from an irradiated edge to a deeper location between abutting surfaces of the two members falls within a predetermined penetration depth range while the laser beam is not moved. After the output of the laser beam is gradually increased, the laser beam is moved toward a welding end position so that the penetration depth is maintained within the penetration depth range.

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