TH71213B - spark plug - Google Patents

Abstract

DC60 (15/10/57) Spark plug will be provided that it can improve combustion efficiency of The engine combustion for the better The cross-sectional shape of the center section 460 of the earth 40 electrode in a 100 spark plug corresponds to B greater than or equal to. (A / 2), R1> r1 and R2> r2, where A is the length from reference point P3 to reference point P4 along the X axis direction; B is the length from the line connecting the reference point P3 and the reference point P4. To reference point P7; r1 is the mean radius of the first arc; r2 is the mean radius of the second arc; R1 is the average radius of the third arc; And R2 is the mean radius of the fourth arc. Spark plugs will be prepared so that it can improve the combustion efficiency of The engine combustion for the better The cross-sectional shape of the center section 460 of the earth 40 electrode in a 100 spark plug corresponds to B> (A / 2), R1> r1 and R2> r2, where A is the length from reference point P3 to reference point P4 along the X axis direction; B is the length from the straight line connecting the reference point P3 to the point. Reference P4 to reference point P7; r1 is the average curvature radius of the first arc; r2 is the average curvature radius of the second arc; R1 is the average curvature radius of the third arc; And R2 is the mean radius of the fourth arc.

Claims (1)

Disclaimers (all) that will not appear on the advertisement page: 1. A spark plug which consists of: a center electrode which is in the form of a rod and extends into the direction of the axial line; Metal shell, which is in the form of a pipe; And an earth electrode, which has a base and a tip Where the base end is fixed on the metal shell and where the ground electrode is bent towards the top end of the center electrode. In the sense that the distal ends form a gap in the direction of the axial line relative to Center electrode Where the ground electrodes have their faces facing each other facing the center electrode. Where the surface Facing each other will extend the boundary from the base to the tip. Where the line appears of the cross-sectional shape of the earth electrode The cross-section shape, which has been Set the position on the plane which will be orthogonal to the direction of the axial line. Within the interval is 0.30 mm in each direction from the midpoint of the length of the gap along the direction of Axial lines consist of: sides facing each other, which take the form of straight lines and make up the Surfaces facing each other; The first arc in which Of the two reference points P1 and P2, the end points of The sides face each other and two reference points P3 and P4, the maximum length between them in The cross-section shapes in the X-axis direction along the sides face each other. It connects the reference point P1 and the reference point P3 and conveys outwards;