PURPOSE: To prevent deterioration due to lack of main injection while preventing generation of operational noise by oil impulse at the time of closing a spill valve when auxiliary injection is finished, and further shorten a time interval between the auxiliary injection and the main injection in the case of pilot injection of an engine.
CONSTITUTION: Fuel in a pressure chamber 15 compressed up to a high pressure by movement to the right, of a plunger 6 is supplied from a distribution passage 21 to the injection valve 20 of each cylinder, but timings of starting/finishing of injection are controlled, and occasionally partial high pressure fuel is forced to overflow from the pressure chamber 15 to a low pressure chamber 18 via a passage 44, a spill valve 24, a spring chamber 40, and a low pressure passage 41, for performing pilot injection. A throttle 46 of a small diameter is provided in the passage 44, and resistance is given to the high pressure fuel which overflows at the time of finishing auxiliary injection of pilot injection so as to soften oil impulse, but deterioration due to lack of injection is prevented by connecting to a radial groove 49, 50, and a port 47, a plunger passage 48 at the time of finishing the main injection.
ABE MASAYUKI
SAKAKIBARA YASUYUKI
