Patent ID: 8573507

Claim:
A fuel injection device comprising: a control body having a pressure control chamber, the control body comprising: a holder having a fuel supply channel and a fuel return channel; a valve body member that includes an inflow channel that ends at an inflow port from which fuel is discharged into the pressure control chamber, and an outfow channel that begins at an outflow port that receives fuel from the pressure control chamber, and an abutting surface exposed to the pressure control chamber and having the inflow port and the outflow port opened therein; a cylinder member that defines the pressure control chamber together with the valve body member, the cylinder member being provided with a cylindrical inner wall surface portion that extends in an axial direction of the control body; a pressure control valve configured to open and close a connection between the outflow channel and the return channel, so as to control a pressure of the fuel in the pressure control chamber; a valve portion including a valve member that is configured to open and close the valve portion in response to the pressure of the fuel in the pressure control chamber; and a pressing member having a cylindrical shape and arranged in the pressure control chamber and which reciprocates in the pressure control chamber in response to the opening and closing of the pressure control valve, the pressing member having a circular pressing surface opposite to the abutting surface of the valve body member, wherein the circular pressing surface of the pressing member presses the abutting surface to interrupt communication between the inflow port and the pressure control chamber when the pressure control valve opens to permit communication between the outflow channel and the return channel, the circular pressing surface of the pressing member is displaced and separated from the abutting surface to open the inflow port of the abutting surface to the pressure control chamber when the pressure control valve closes to prevent communication between the outflow channel and the return channel, the pressing member has an outer wall surface portion that is opposite to the cylindrical inner wall surface portion of the cylinder member, the pressing member being capable of contacting the cylindrical inner wall surface portion of the cylinder member, at least one of the outer wall surface portion of the pressing member and the cylindrical inner wall surface portion of the cylinder member is provided with a recess portion that is recessed with respect to the other of the outer wall surface portion of the pressing member and the cylindrical inner wall surface portion of the cylinder member, and the pressing member has therein a communication through hole through which the outflow port communicates with the pressure control chamber when the circular pressing surface abuts on the abutting surface.