| 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 |
