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: 2017-03-08

A spark plug (1) comprising a center electrode, a ground electrode (8) disposed on the center electrode across a gap, and a tip (9) joined to an opposed surface of the ground electrode that is opposed to the center electrode, the tip has a discharge layer (40) and a relieving layer (50), the relieving layer is formed from a Pt-Ni alloy and joined to the opposed surface via a diffusion layer, the discharge layer is formed from a Pt-Rh alloy and joined via a clad diffusion layer to a side of the relieving layer opposite to a side of the relieving layer at which the ground electrode is joined, and 0.81 A/B 1.21 is satisfied when an average cross-sectional area of the discharge layer is A mm^(2) and an average cross-sectional area of the relieving layer is B mm^(2), and a method for producing the spark plug.


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

Disclosed is a plug connector capable of increasing the sealing between a rubber member and an outer circumferential surface of a spark plug insulator for improvement in current leakage resistance. A plug connector according to the present invention includes a conductive part that electrically connects a spark plug and a power supply member for power supply to the spark plug; and a rubber member that covers the conductive part. Herein, the spark plug has an insulator and a terminal electrode protruding toward the rear from a rear end of the insulator. The plug connector further includes a ring member arranged on an outer circumference of the rubber member.


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 Spark Plug Co. | Date: 2017-03-15

A ceramic heater includes a substrate containing a ceramic, and a resistor containing another ceramic and embedded in the substrate. The resistor includes two lead portions, a joint portion connecting the two lead portions, and an electrode portion formed integrally with at least one lead portion and extending in a direction crossing an axial line of the one lead portion. The electrode portion has a base end portion connected to the one lead portion, a distal end portion exposed at an outer surface of the substrate, and a connection portion disposed between the base end portion and the distal end portion and connecting the base end portion and the distal end portion together. A cross section of either the base end portion, the distal end portion, and the connection portion has an imaginary plane perpendicular to an extension direction of the electrode portion and has a streamline shape.


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.

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