| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ignition device with excellent ignitability and durability for causing ignition by injecting plasma-state gas in an engine. <P>SOLUTION: In an ignition device 1, a discharge space 140 is blocked by a center electrode 110, an approximate tubular insulator 120 extending downward beyond its lower end, and a ground electrode 130 provided with an opening 131 communicated with its opening. A high voltage is applied and a large current is supplied to the discharge space 140, and gas in the discharge space 140 is made into a plasma state and injected in an engine combustion chamber 400 for causing ignition. A rotation providing mechanism provides a rotation force toward a center from an outer periphery of an airflow to a flow of the gas emitted from the discharge space 140. An opening of the ground electrode 130 is flush with and communicated with a lower bottom opening of the insulator 120 to become a first opening 131. A second opening 132 has a rotation providing space 141 projecting toward its tip, and blocked by a tubular peripheral wall 133 surrounding the first opening 131. <P>COPYRIGHT: (C)2012,JPO&INPIT |
