FUEL INJECTION DEVICE FOR DIESEL ENGINE

PURPOSE:To reduce NOx and improve output by increasing the quantity of lead angle in a medium speed zone as well as the change in lead angle in a high speed zone at a warm time, whereas, at a cold time, correcting the quantity of lead angle in a low speed zone toward the advancing direction while making the number of revolutions for increasing a lead angle to the high speed zone smaller than at the warm time. CONSTITUTION:When flyweights 7, 8 are moved in the separating direction from each other, first cams 9, 10 are rotated in the direction in which first pin holes 11a, 12a are separated from each other. At the same time, second cams 13, 14 are rotated so that the distance between second pins 15, 16 is not varied. And, the relative angle positions of first pins 11, 12 are changed with respect to the second pins 15, 16 respectively centering around an output shaft 5. Thereby, the phase difference between a flange 6 as an input part and the output shaft 5 is varied changing fuel injection timing. In this case, i.e., during a cold time, the spring force of a spring 35 is larger than the spring force of timer springs 22, 23 while the centrifugal force generated in flyweights 7, 8 is small, thereby, making the quantity of lead angle constant.