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发明授权
US07328677B2 Plasma-jet spark plug and ignition system 有权
等离子火花塞和点火系统

Plasma-jet spark plug and ignition system
摘要：
A plasma-jet spark plug includes a metal shell, an electrical insulator retained in the metal shell, a center electrode held in an axial hole of the electrical insulator to define a cavity by a front end face of the center electrode and an inner circumferential surface of the insulator axial hole and a ground electrode fitted to a front end face of the electrical insulator and formed with an opening for communication between the cavity and the outside of the spark plug and satisfies the following dimensional relationships: d≦D≦3d; 0.5 mm≦d≦1.5 mm; L1≦1.5 mm; 2d≦L2≦3.5 mm; and L2+{(D−d)/2}≦3.5 mm where D is a diameter of the ground electrode opening; L1 is a thickness of the ground electrode; d is a diameter of the cavity; and L2 is a depth of the cavity.
摘要（中）：

等离子体火花塞包括金属壳，保持在金属壳中的电绝缘体，保持在电绝缘体的轴向孔中的中心电极，以通过中心电极的前端面限定空腔和内周面 的绝缘子轴孔和接地电极，其配合到电绝缘体的前端面，并且形成有用于在空腔和火花塞外部连通的开口，并且满足以下维度关系：<β在线公式 description =“In-Line Formulas”end =“lead”？> d <= D <= 3d; <？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line -formulae description =“In-line Formulas”end =“lead”？> 0.5 mm <= d <= 1.5 mm; <？in-line-formula description =“In-line Formulas”end =“tail”？> ？in-line-formula description =“In-line Formulas”end =“lead”？> L1 <= 1.5 mm; <？in-line-formula description =“In-line Formulas”end =“tail”？> ？in-line-formula description =“In-line Formulas”end =“lea” d“>> 2d <= L2 <= 3.5mm; 和<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> L2 + {（Dd） /2}<=3.5mm <？in-line-formula description =“In-line Formulas”end =“tail”？>其中D是接地电极开口的直径; L1是接地电极的厚度; d是空腔的直径; L2是空腔的深度。

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