Patent ID: 9127629
Filing Date: 2015-09-08
Classification: F02M

Abstract:
1. A fuel injection device comprising: a valve body in which a high-pressure fuel passage is provided, the valve body having an injection hole at a tip end, from which the high-pressure fuel is injected into a combustion chamber of an internal combustion engine; a valve member which is movable in an axial direction of the valve body in an inside of the valve body, and opens or closes the injection hole; a pressure control chamber which is provided within the valve body at a side opposite from the injection hole with respect to the valve member, and which introduces the high-pressure fuel and controls the movement of the valve member by using fuel pressure; an inflow channel through which the high-pressure fuel is introduced to the pressure control chamber; an outflow channel through which the fuel from the pressure control chamber is discharged to an exterior low-pressure side; and a control member which is movable in the axial direction of the valve body in an inside of the valve body, and opens or closes the inflow channel, wherein the valve body includes a cylindrical inner wall portion defining the pressure control chamber in a radial direction thereof, and the cylindrical inner wall portion includes a communication groove which causes an inflow chamber that is provided within the pressure control chamber at a side of the inflow channel relative to the control member, to communicate with a back pressure chamber that is provided within the pressure control chamber at a side of the valve member relative to the control member, wherein a plurality of the communication grooves are arranged and spaced from one another in a circumferential direction on the cylindrical inner wall portion, and wherein the communication grooves are equally spaced from one another in the circumferential direction.