| 摘要 |
A distributor type fuel injection pump which includes a port formed within the pressurized fuel distributing plunger with one end thereof communicating with the pump working chamber and the other end terminating in the outer periphery of said plunger, and a relief passage having one end thereof terminating in the inner peripheral wall of the plunger barrel and the other end communicating with a zone under a lower pressure. Said port and relief passage are so located as to register with each other at the beginning of the fuel delivery stroke of said plunger, and said relief passage is so arranged as to be permanently kept closed by a valve means which is actuated by a valve actuating means for actuating said valve means in response to a fuel supply pressure varying as a function of the engine rotational speed, except in a predetermined low engine speed range, to obtain a decreased injection rate during idling so as to increase the injection period, thereby reducing the rate of combustion of the engine to largely reduce the combustion noise.
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