| 摘要 |
In a fuel injection pump having a dual plunger composed of a first plunger for adjusting the timing of the beginning of fuel injection and a second plunger for adjusting the timing of the end of fuel injection, the first and second plungers are operatively connected with a governor in such a way that only the first adjusting member is operated in accordance with the governor and the second plunger is displaced in accordance with the displacement of the first plunger, whereby the second plunger is displaced by the distance necessary for compensating for the change in the amount of fuel injection caused by the displacement. ming, and the second pinion member is engaged with a second rack for adjusting the rotational position of the second plunger to set the timing of the beginning of fuel injection at any desired timing. The fuel injection pump is provided with a governor having an operating rod for positioning the position of the first rack, and the operating rod and the first and second racks are operatively connected through a lever mechanism or a link mechanism. The lever mechanism functions such that only the first rack is displaced placed in accordance with the movement of the operating rod and only the first rack is displaced at a predetermined ratio of displacement in response to the displacement of the second rack. That is, in response to the displacement of the operating rod, the first rack is positioned without causing the second rack to move and in response to the displacement of the second rack, the first rack is displaced without causing the operating rod to move. As a result, the change in the amount of fuel injected caused by the displacement of the second rack can be compensated for without changing the position of the operating rod, so that the position of the operating rod always shows the exact amount of fuel injection. The above-mentioned compensating operation can be easily realized by selecting the ratio of displacement between the first and the second racks when the position of the second rack is adjusted, in relation to the configurations of the first and the second helix leads. As described above, even when the timing of the beginning of the fuel injection is changed by the displacement of the second rack, the amount of fuel injected after the timing of the beginning of fuel injection has been changed can be maintained at the same amount as before the change, so long as the operating rod of the governor is maintained in the same position. As a result, the magnitude of the load on the engine can be known from the position of the operating rod irrespective of the position of the first rack.
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