| 摘要 |
PURPOSE:To stabilize the operation of an engine and prevent the generation of afterburning and the vibration of said engine by specifying the relation between each of the contact gaps to a fixed electrode and a movable electrode, of one part of cap side electrodes. CONSTITUTION:A fixed electrode 3 and a movable electrode 2 are provided up and down on a rotatable rotor head 1, and the movable electrode 2 is pulled by a spring 4. Both the electrodes 2, 3 are oppositely provided to the electrodes 5, 5' on the cap side of a distributor, and send a high voltage which is led y the central terminal 5 of the cap 7 side to the electrodes 5, 5' by means of a spark discharge, via a rotor head 1. And, the gap 11 between the end side of one electrode 5' and the fixed electrode 3 is made constant, while a notch 52 with a depth 13 is formed on the end side of the electrode 5' to make a gap 12 between the movable electrode 2 which is moved to the maximum and the electrode 5' smaller than said gap 11. Thereby, when an engine is overly rotated, only one electrode 5' is electrified to carry out reduction in the rotation of the engine with only a part of cylinders.
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