Assertion: surface discharge spark gap | /r/HasAspect | a surface spark gap
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Source sentences:
text: the internal protrusion of the metal shell has a radial surface and an internal shoulder on opposite axial sides of the internal protrusion, the radial surface faces the pre-chamber and the internal shoulder supports the insulator; the distal end surface of the center electrode is located at an axial position that is beyond, in a forward direction, the distal end surface of the insulator by an axial distance (DA 1 , DA 2 ) that is from 0 mm-5 mm, inclusive; the radial surface of the internal protrusion is located at an axial position that is beyond, in a forward direction, the distal end surface of the insulator by an axial distance (DC 1 , DC 2 ) that is from 0 mm-5 mm, inclusive; the distal end surface of the metal shell is located at an axial position that is beyond, in a forward direction, the radial surface of the internal protrusion, the distal end surface of the insulator, and the distal end surface of the center electrode; the radial surface of the internal protrusion is located at an axial position that is beyond, in a forward direction, the distal end surface of the insulator, the distal end surface of the center electrode is located at an axial position that is beyond, in a forward direction, the radial surface of the internal protrusion, and the distal end surface of the metal shell is located at an axial position that is beyond, in a forward direction, the distal end surface of the center electrode; the distal end surface of the center electrode is located at an axial position that is beyond, in a forward direction, the distal end surface of the insulator, the radial surface of the internal protrusion is located at an axial position that is beyond, in a forward direction, the distal end surface of the center electrode, and the distal end surface of the metal shell is located at an axial position that is beyond, in a forward direction, the radial surface of the internal protrusion; the surface discharge spark gap has a radial sparking portion where a majority of the sparking occurs in a generally radial direction, with respect to a central axis of the spark plug, as opposed to an axial direction; the radial sparking portion extends between the center electrode and the internal protrusion along the distal end surface of the insulator over a radial distance (GFS 1 ) that is from 0.5 mm and 3.0 mm, inclusive; the surface discharge spark gap also has a surface spark gap where a majority of the sparking occurs along the distal end surface of the insulator, as opposed to an aerial spark gap; the surface discharge spark gap has both a radial sparking portion where sparking occurs in a generally radial direction and an axial sparking portion where sparking occurs in a generally axial direction, with respect to a central axis of the spark plug; the radial sparking portion extends between the center electrode and the internal protrusion along the distal end surface of the insulator over a radial distance (GFS 2 ) that is from 0.5 mm and 3.0 mm, inclusive, and the axial sparking portion extends between the insulator and the internal protrusion across an aerial spark gap that has an axial distance (LFS 2 ) that is from 0.3 mm and 2.0 mm, inclusive; the distal end surface of the insulator is largely a flat, annular surface that extends in a radial direction, with respect to a central axis of the spark plug, so that the distal end surface of the center electrode, the distal end surface of the insulator, and a radial surface of the internal protrusion are all flush or nearly flush with one another; the pre-chamber is defined by the pre-chamber wall of the pre-chamber cap on a forward end of the pre-chamber, by the pre-chamber wall of the pre-chamber cap and a pre-chamber wall of the metal shell on sides of the pre-chamber, and by a combination of the distal end surface of the center electrode, the distal end surface of the insulator, and a radial surface of the internal protrusion on a rearward end of the pre-chamber; the surface discharge spark gap is located at the rearward end of the pre-chamber and is configured so that sparking components will have minimal electrode obstruction and promote unhindered gas exchange between the pre-chamber and the main combustion chamber; and the pre-chamber spark plug is a passive pre-chamber spark plug and is configured to receive air and fuel only from the main combustion chamber through the one or more orifice(s) in the pre-chamber cap, and not from any additional injectors that direct air or fuel directly inside the pre-chamber.