Fuel injection device for internal combustion engine, has spiral grooves with flow sectional area reduced gradually towards outlet direction and causing fuel particles to collide against one another to produce fine particles

摘要

The device has a fuel supply hole supplied with fuel through an injection hole (21) of an injector. The supplied fuel is distributed to a set of spiral grooves (12) through a connection pipe. Each groove has a flow sectional area reduced gradually towards an outlet direction, to increase the flow rate of the fuel. The grooves cause fuel particles to collide against one another for producing fine fuel particles.