Patent application number | Description | Published |
20090277410 | SPARK PLUG - Projecting portions extended in an axis (O) direction and projecting forward are formed on a front end face of a cylindrical portion provided on a front end side of a metal shell. The projecting portions are disposed at an equal interval therebetween in a circumferential direction revolving around a center S of a firing portion. Regardless of the mounting state of a spark plug on an engine head (i.e., a shift in the circumferential direction caused by a difference in tightening of a fitting screw), a side face or an end face of any one of projecting portions will face an upstream side of a fuel (combustible air-fuel mixture layer) flow direction, which flows with an air current in a combustion chamber. Therefore, the combustible air-fuel mixture layer colliding with the projecting portion includes the flow direction directed to the firing portion as its reflective direction and is thus adrift around the firing portion. | 11-12-2009 |
20100043748 | SPARK PLUG - A peripheral wall extending portion is formed in such a manner that a front end side of a cylindrical hole of a metal shell projects forward in an axis O direction, and the peripheral wall extending portion comprising: a projecting portion formed into a projecting shape, and a connecting portion which connects between the projecting portions. A fuel injected from an injection orifice of an injector strikes against the projecting portion and is unlikely to directly reach to a spark discharge gap formed between a noble metal tip and a front end portion of a ground electrode. The fuel that strikes against the projecting portions without striking against the projecting portion is separated into a droplet-like incompletely vaporized fuel that adheres to the projecting portions and a vaporized fuel being reflected to a perimeter of the spark discharge gap. | 02-25-2010 |
20100264803 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE AND METHOD FOR MANUFACTURING SPARK PLUG - A spark plug including a center electrode and a ground electrode. A center electrode noble metal tip is joined to a leading end portion of a center electrode, and a ground electrode noble metal tip is joined to a center-electrode-side side surface of the ground electrode. A distal end portion of the ground electrode noble metal tip protrudes from a distal-end surface of the ground electrode by 0.1 mm to 1.5 mm. A center-electrode-side side surface of the ground electrode noble metal tip projects from a center-electrode-side side surface by 0.15 mm to 0.6 mm. The ground electrode includes chamfered portions. Thickness lengths and widthwise lengths of the respective chamfered portions achieved within a cross section perpendicular to a center axis of the ground electrode are set to 0.2 mm or more. | 10-21-2010 |
20100264804 | SPARK PLUG - A center electrode includes a tapered electrode base member mount and a noble metal tip joined to the electrode base member mount via a fused portion in which the component of the noble metal tip and the component of the electrode base member mount are fused. In this state, the cross section area S | 10-21-2010 |
20100275870 | SPARK PLUG FOR INTERNAL COMBUSTION ENGINE - A spark plug includes a center electrode extending along an axial line, a ground electrode, and a noble metal tip. A center axis of the noble metal tip is displaced from a center axis of the ground electrode toward a base-end side in the axial line. The ground electrode includes an outer layer and an inner layer, and a distal end of the inner layer is closer to the axial line than a base end of the ground electrode. An overlap area between the inner layer and the noble metal tip occupies a ratio of 25% or more in a projective plane defined by projecting, along the center axis, a plane of the ground electrode viewed from a distal-end face on a cross section of the ground electrode in which a maximum cross-sectional area of the inner layer is achieved, among cross sections orthogonal to the center axis. | 11-04-2010 |
20100283373 | SPARK PLUG - A corner of a distal end of a ground-electrode-side noble metal tip of a spark plug is taken as a first corner; a corner of a leading end of a center-electrode-side noble metal tip is taken as a second corner; a corner formed at a starting point where a diameter of the center electrode is reduced is taken as a third corner; a corner of the ground electrode is taken as a fourth corner; a corner closest to the third corner of the corners on the distal end of the ground-electrode-side noble metal tip is taken as a fifth corner; a length of a virtual flying spark path defined between the first corner and the second corner is taken as L | 11-11-2010 |
20110215702 | SPARK PLUG - A spark plug having an electrode, an insulator, a metallic shell, a main ground electrode, and at least two auxiliary ground electrodes. | 09-08-2011 |
20110254429 | PLASMA JET SPARK PLUG - A plasma jet spark plug capable of preventing a channeling progress and having excellent heat conduction. The plasma jet spark plug comprised of: a ceramic insulator having a small diameter portion which assumes a linear shape in an axial direction, and a center electrode has an outer diameter increasing in the order of a frontmost portion, a step portion, a front end portion and a body portion. | 10-20-2011 |
20110297131 | IGNITION APPARATUS OF PLASMA JET IGNITION PLUG - A current of sufficient size to form plasma at ignition of a plasma jet ignition plug flows to a spark discharge gap while suppressing noise occurrence. | 12-08-2011 |
Patent application number | Description | Published |
20100259172 | Plasma jet ignition plug - A plasma jet ignition plug including a wire-wound resistor for restraining the radiation of noise while allowing application of a sufficiently large current for generation of plasma to a spark discharge gap at the time of ignition. The wire-wound resistor having an inductance of 1 μH to 100 μH inclusive and a resistance of 1Ω or less, and is provided on at least one of a center electrode and a ground electrode. The wire-wound resistor restrains current which is generated by the influence of stray capacitance present in the plasma jet ignition plug, thereby reducing noise. | 10-14-2010 |
20110215704 | PLASMA JET SPARK PLUG - A plasma jet spark plug for igniting an air-fuel mixture in a conventional combustion device such as an internal combustion engine. | 09-08-2011 |
20110221327 | PLASMA-JET SPARK PLUG AND IGNITION SYSTEM - A plasma jet ignition plug including an insulator having an axial hole extending therethrough in the direction of an axis CL | 09-15-2011 |
20110241523 | PLASMA JET IGNITION PLUG - A plasma jet ignition plug having high ignition performance and high durability. The plasma jet ignition plug comprises a center electrode wherein at least a front end portion including a front end surface of the center electrode contains an oxide of at least one of the rare earth elements in a total amount of 0.5% by mass to 10% by mass inclusive and tungsten (W) in an amount of 90% by mass or greater, or contains iridium (Ir) in an amount of 0.3% by mass to 3% by mass inclusive and W in an amount of 97% by mass or greater. | 10-06-2011 |
20120007488 | PLASMA JET IGNITION PLUG - An ignition plug that maintains excellent ignition performance over a long period of time through effective prevention of channeling. The ignition plug includes an insulator having an axial bore, a center electrode inserted into the axial bore, a metallic shell disposed externally of the outer circumference of the insulator, and a ground electrode fixed to a front end portion of the metallic shell. A cavity is defined by the wall surface of the axial bore and the front end surface of the center electrode. The ground electrode includes a body whose distal end portion is disposed away from the front end of the insulator, and a protrusion protruding from the body. | 01-12-2012 |
20120074828 | SPARK PLUG AND MANUFACTURING METHOD THEREOF - A spark plug having improved durability having a ground electrode comprised of a ground electrode base member and a noble metal tip. A center axis of the noble metal tip slants in relation to the center axis of the ground electrode base member at angle θ which satisfies a relation 2°≦θ≦25°. | 03-29-2012 |
20120080995 | PLASMA JET IGNITION PLUG AND MANUFACTURING METHOD THEREOF - A plasma jet ignition plug that reliably prevents current leakage with restraint on variation in the position of a ground electrode relative to an insulator and on overheat of the ground electrode, for stable generation of plasma. The plug includes an insulator having an axial bore extending in the direction of an axis CL | 04-05-2012 |
20120104959 | IGNITION SYSTEM AND IGNITION METHOD - An ignition system including a plasma jet spark plug, a discharge power source, and an energy input portion. The spark plug includes a center electrode inserted and installed in the axis hole of an insulator, a ground electrode forming a clearance with the center electrode in between, and a cavity defined by an inner peripheral surface of the axis hole and a top end surface of the center electrode. A plasma is generated in the cavity as the discharge power source generates a spark discharge by applying a voltage to the clearance and the energy input portion inputs electric power into the clearance. The energy input portion inputs electric power into the clearance more than once in a single spark discharge. | 05-03-2012 |
20120153799 | PLASMA JET IGNITION PLUG - A plasma jet ignition plug exhibiting high plasma generation efficiency while restraining occurrence of preignition. P1 represents the position of a rear end of a region of a metallic shell ledge, the region being in contact with an insulator. P2 represents the position of a rear end of a region of the insulator ledge, the region being in contact with the center electrode. Front end surfaces of the metallic shell, the insulator, and center electrode, an imaginary plane S1 which is perpendicular to the axis and contains position P1, and an imaginary plane perpendicular to the axis and contains position P2 are disposed in this order from front side to rear side along the axis. The axial distance A from the front end surface of the insulator to imaginary plane S1 and axial distance B from the imaginary plane S1 to imaginary plane S2 satisfy 0.5×A≦B. | 06-21-2012 |
20120169244 | IGNITION SYSTEM FOR PLASMA JET IGNITION PLUG - An ignition system for a plasma jet ignition plug that enables a reduction in production cost and provides excellent ignition performance through improvement of plasma formation efficiency. The ignition system includes a plasma jet ignition plug having a center electrode, a ground electrode, and a cavity surrounding at least a portion of a gap formed between the center electrode and the ground electrode to form a discharge space, and a voltage application section for applying voltage across the gap. The ignition system further includes a capacitance section having a capacitance and provided in parallel with the plasma jet ignition plug between the plasma jet ignition plug and the voltage application section. | 07-05-2012 |
20120242214 | PLASMA JET IGNITION PLUG - A plasma jet ignition plug including an insulating body having an axial hole therethrough. A center electrode is inserted into the axial hole. A cavity portion is defined by the insulating body and center electrode, with the leading end of the axial hole as an opening end. A decreasing diameter portion decreasing in diameter toward a leading end side is formed on the axial hole, the leading end of the decreasing diameter portion is positioned closer to the leading end side than the leading end face of the center electrode. The inside diameter of the leading end of the decreasing diameter portion is made smaller than the outside diameter of the leading end face of the center electrode. | 09-27-2012 |
Patent application number | Description | Published |
20090136658 | Niobium 2-Ethylhexanoate Derivative, Method Of Producing The Derivative, Organic Acid Metal Salt Composition Containing The Derivative, And Method Of Producing Thin Film Using The Composition - The present invention provides a niobium 2-ethylhexanoate derivative having a niobium content of from 13 to 16 mass % and a carbon content within a range of from 50 to 58 mass %, the niobium 2-ethylhexanoate derivative consisting only of: niobium atoms, oxygen atoms, and 2-ethylhexanoic acid residues; the niobium 2-ethylhexanoate derivative can be produced by reacting pentakis(alkoxy)niobium with 2-ethylhexanoic acid; further, the organic acid metal salt composition of the present invention includes the niobium 2-ethylhexanoate derivative, a metal precursor other than niobium, and at least one kind of an organic solvent; and the thin film including a niobium element and metal other than niobium can be formed on a substrate by applying the organic acid metal salt composition on the substrate and heating the substrate with the applied organic acid metal salt composition. | 05-28-2009 |
20100159128 | Niobium 2-ethylhexanoate derivative, method of producing the derivative, organic acid metal salt composition containing the derivative, and method of producing thin film using the composition - The present invention provides a niobium 2-ethylhexanoate derivative having a niobium content of from 13 to 16 mass % and a carbon content within a range of from 50 to 58 mass %, the niobium 2-ethylhexanoate derivative consisting only of: niobium atoms, oxygen atoms, and 2-ethylhexanoic acid residues; the niobium 2-ethylhexanoate derivative can be produced by reacting pentakis(alkoxy)niobium with 2-ethylhexanoic acid; further, the organic acid metal salt composition of the present invention includes the niobium 2-ethylhexanoate derivative, a metal precursor other than niobium, and at least one kind of an organic solvent; and the thin film including a niobium element and metal other than niobium can be formed on a substrate by applying the organic acid metal salt composition on the substrate and heating the substrate with the applied organic acid metal salt composition. | 06-24-2010 |
Patent application number | Description | Published |
20120212131 | PLASMA JET SPARK PLUG AND IGNITION SYSTEM - A plasma jet spark plug having increased capacitive discharge current, and thus improved plasma generation efficiency. The plasma jet spark plug includes an insulating body having an axial hole, a center electrode, a metal shell, and a cavity portion formed by the inner peripheral surface of the insulating body and the leading end face of the center electrode. A conductive layer formed from a conductive material is provided on at least one portion of at least one of: (a) a surface on the insulating body outer peripheral surface opposed to the inner peripheral surface of the metal shell, the conductive layer electrically connected to a ground electrode; and (b) a surface on the insulating body inner peripheral surface opposed to the outer peripheral surface of the center electrode, the conductive layer electrically connected to the center electrode. | 08-23-2012 |
20130088140 | PLASMA JET IGNITION PLUG - An ignition plug providing excellent ignition performance that can be maintained over a long period of time by restraining channeling. The ignition plug includes a ceramic insulator having an axial bore, a center electrode inserted into the axial bore, a metallic shell, and a ground electrode fixed to the metallic shell, and has a cavity defined by an inner circumferential surface of the axial bore and the forward end surface of the center electrode. The axial bore includes a first straight portion and a diameter-reducing portion. As viewed on a section which contains an axis (CL | 04-11-2013 |
20130269643 | IGNITION APPARATUS AND IGNITION SYSTEM - An ignition apparatus which facilitates improvement in energy efficiency as well as materializing an excellent ignitability through effectively utilizing energy used for inductive discharge as a blowout power. The ignition apparatus is used for an ignition plug that includes a center electrode, a ground electrode and a cavity surrounding at least a portion of a clearance formed between the two electrodes to thereby form a discharge space. The ignition apparatus includes a voltage application portion which applies voltage to the clearance and a power supply portion which supplies electric power to the clearance. In addition, a capacitance portion for storing a capacitance is provided, in parallel with the ignition plug, in a voltage application path of the voltage application portion. | 10-17-2013 |