| 摘要 |
PROBLEM TO BE SOLVED: To provide a desired advance of an ignition timing while holding the highly efficient output state and to dispense with an advancing means in a structure in an ignition circuit side by rotationally displacing a magnetic steel of a flywheel in the advancing direction according to change in the rotation speed on an internal combustion engine. SOLUTION: This flywheel for the ignition device is so constituted that a magnetic rotary plate 9 having the magnetic steel 11 is coaxially and rotationally assembled to a nonmagnetic rotary plate 2 with its circumferential end closely opposed to a fixed ignition coil, radial displacement of a fly weight 15 fitted to the other end of a spring 14 with its one end fixed to the rotary plate 2 is guided by a guide part 6, the displacement limit is set by a stopper 7, and a connecting rod 16 comprises a link mechanism by connecting the fly weight 15 to the magnetic steel rotary plate 9. This constitution can provide a large automatic advance in the ignition timing by the rotational displacement of the magnetic steel 11 caused by the centrifugal force acting on the fly weight 15 following to the rotation speed.
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