Fuel injection device

Abstract

Abstract PURPOSE:To enable the suitable injection of fuel to be continually performed, by providing a phase controller on the cam shaft of a rack cam, in the case of an injector metering the amount of fuel by rotating a plunger having a lead through a control rack. CONSTITUTION:If a cam shaft 57 rotates causing a plunger 13 having a metering lead 48 to rise in accordance with operation of an engine, fuel supplied to a port 52 is fed to a pump chamber 37 from a hole 38, next the plunger 13 lowers to close the hole 38, and then the fuel is compressed. The compressed fuel is fed to a fuel reservoir 27 via passages 54-56, and the fuel, after forcing a nozzle needle 12 to be lifted against a spring 31, is injected from nozzles 25, 26. Here a rack cam 17 is rotated through a phase controller 18 on the basis of a fuel injection pattern determined by a control unit 19 in accordance with the depressing amount of an accelerator pedal and a speed of the engine. In this way, the amount of fuel is adjusted by rotating the plunger 13 through a control rack 15.

Inventors

• 👤 Makoto Endo
• 👤 真 遠藤

Bibliographic Details