METHOD FOR MEASURING DEVIATION OF CONNECTING POSITION OF MEMBER, METHOD FOR PRODUCING SPARK PLUG

• Main Author: OZEKI, Atsushi
• Format: Patent
• Language: English; French; German
• Published: 02.10.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CORONA DEVICES; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; PHYSICS; SPARK GAPS; SPARKING PLUGS; TESTING

A measurement face 360 is observed so as to measure a deviation of a ground electrode 30 from an optimal igniting position while a metallic shell 50 is engaged with a female thread jig 300. The deviation of the ground electrode 30 from the optimal igniting position O1 is measured in such a manner that the axis O of metallic shell 50, and a predetermined first measuring point P1 and a predetermined second measuring point P2 on a front end face 30a of the ground electrode 30 are detected. Then, a circumferential angle ²1 formed between: a reference straight line "LS" which connects an axis O of the metallic shell 50 to the optimal igniting position O1 and a first straight line L1 which connects the axis O to the first measuring point P1; and a circumferential angle ²1 formed between the reference straight line "LS" and a second straight line L2 that connects the axis O t the second measuring point P2 are measured. Thereafter, the deviation of the ground electrode 30 from the optimal igniting position O1 is measured. The deviation is represented by a circumferential angle "±" formed between the reference straight line "LS" and a third straight line L3 that connects the axis O to the center C of the front end face of the ground electrode 30.