发明名称 |
Method of manufacturing spark plug |
摘要 |
A method for manufacturing a spark plug includes: a preparation step of preparing a specimen provided with a center electrode, an insulator, a metal shell, and a ground electrode; and an inspection step of applying a predetermined voltage between the ground electrode and the center electrode of the prepared specimen, and determining whether dielectric breakdown is caused in the insulator. The inspection step includes a calculation step and a judgment step. The calculation step involves receiving an oscillating wave generated from the specimen upon application of the predetermined voltage to the specimen, obtaining a power spectrum by subjecting an oscillating wave signal representing the oscillating wave to fast Fourier transform, and then calculating an integral of a predetermined frequency range in the power spectrum. In the judgment step, whether discharge is caused by dielectric breakdown of the insulator is judged by utilizing the integral. |
申请公布号 |
US9160148(B2) |
申请公布日期 |
2015.10.13 |
申请号 |
US201314078896 |
申请日期 |
2013.11.13 |
申请人 |
NGK SPARK PLUG., LTD. |
发明人 |
Kyuno Jiro |
分类号 |
H01T13/60;H01T21/02;H01T21/06 |
主分类号 |
H01T13/60 |
代理机构 |
Leason Ellis LLP |
代理人 |
Leason Ellis LLP |
主权项 |
1. A method for manufacturing a spark plug comprising:
a preparation step of preparing a specimen including a bar-shaped center electrode, an insulator disposed on an outer periphery of the center electrode, a metal shell disposed on an outer periphery of the insulator, and a ground electrode with one end attached to the metal shell for forming a spark gap with the center electrode; and an inspection step of determining whether dielectric breakdown is caused in the insulator by applying a predetermined voltage between the ground electrode and the center electrode of the prepared specimen, wherein the inspection step includes; a calculation step of receiving an oscillating wave generated from the specimen upon application of the predetermined voltage to the specimen, determining a power spectrum by subjecting an oscillating wave signal representing the oscillating wave to fast Fourier transform, and then calculating an integral of a predetermined frequency range in the power spectrum, and a judgment step of judging whether discharge is caused by dielectric breakdown of the insulator by utilizing the integral. |
地址 |
Nagoya JP |