| 摘要 |
<p>With the structure comprising a cylinder 10, a magnetic circuit to exert mountain-shaped thrust, and a feeding spring 50 to exert urging force to the plunger 20 in a feeding process, fuel is sucked by the movement of the plunger 20 and energy is accumulated at the feeding spring 50 at a powering state, the fuel is fed by the movement of the plunger 20 by the urging force of the feeding spring 50 at a non-powering state, the spring constant of the feeding spring 50 is set to generate the urging force larger than the thrust in an early range of the mountain-shaped thrust, and the second spring 60 is disposed to exert the urging force in a direction against the urging force of the feeding spring 50 to make the urging force smaller than the thrust, at least in the early range. In this manner, with an electromagnetically driven type plunger pump of a non-powering feeding type, the effective stroke is enlarged and the feeding amount is increased. <IMAGE></p> |
