For a fuel injection device, a configuration to improve fuel sealability when a valve is closed is provided. Therefore, the fuel injection device includes: a valve body that opens and closes a fuel flow path; a movable iron core in which a fuel passage hole communicating an upstream side and a downstream side is formed, and that operates the valve body toward the upstream side; a biasing spring whose one end contacts the movable iron core, and that biases the movable iron core in a valve opening direction; and a regulating unit that regulates movement of the one end of the biasing spring, in which the shortest distance between the one end of the biasing spring and the fuel passage hole is larger than a radial travel distance of the one end until radial movement of the one end is regulated by the regulating unit.

A fuel injection valve includes a valve body, a fixed core, a movable core, a holder, and a stopper. The movable core has an inner core that contacts the stopper, and an outer core press-fitted to an outer peripheral surface of the inner core. The outer core has, in a moving direction of the movable core, a press-fit region which is press-fitted to the outer peripheral surface of the inner core, and a non-press-fit region which is not press-fitted to the outer peripheral surface of the inner core and is adjacent to the press-fit region in the moving direction. Between the inner peripheral surface of the holder and the outer peripheral surface of the movable core, the smallest gap in the press-fit region is larger than the smallest gap in the non-press-fit region.

A valve assembly for a pump includes an electrical actuator having a stator and an armature, where the armature includes a top armature surface facing the stator and having an inwardly stepped-up profile that forms a raised surface at a radially inward location, and a lower, gap-forming surface at a radially outward location that forms a gap between the armature and the stator when the electrical actuator is activated to facilitate displacing fluid and avoiding production of high velocity, potentially damaging fluid flows.

A valve for metering a fluid. An armature of the electromagnetic actuator is movable along a longitudinal axis of a valve needle, the movement of the armature relative to the valve needle being limited by a stop surface on the valve needle. The armature has a passage channel. The stop surface is on a stop element. The stop element and the armature are such that during operation there always remains an intermediate space, adjoining the valve needle, between the stop element and an end face of the armature facing the stop element. The stop surface lies, in a contact region, on the end surface of the armature facing the stop element when the armature and the stop surface come into contact during operation, the contact region being situated between the intermediate space and an opening of the passage channel when the armature and the stop surface come into contact.

A fuel pump includes a fuel pump housing with a pumping chamber; a pumping plunger which reciprocates within a plunger bore; and an inlet valve assembly. The inlet valve assembly includes a check valve member which is moveable between an unseated position which provides fluid communication between the pumping chamber and a fuel supply passage and a seated position which prevents fluid communication between the pumping chamber and the fuel supply passage; and a solenoid assembly which includes a wire winding; a pole piece; an armature which is moveable between a first position when the wire winding is not energized and a second position when the wire winding is energized; a return spring which biases the armature away from the pole piece; and a control rod which is moveable along the inlet valve axis independently of the armature.

The disclosed inlet check valve is used in a high pressure fuel pump and is comprised of a valve member integrally connected to a valve stem which is coupled to an inlet valve armature. The valve member has a stroke along an axis between an open position and a closed position. An inlet valve solenoid generates a magnetic field in an inlet valve pole to attract the inlet valve armature and move the valve member from the open position to the closed position. In the open position, the valve member contacts an inlet valve stop and a gap greater than the stroke of the valve member is defined along the axis between the inlet valve armature and the inlet valve pole. In the closed position, an inlet valve seat mates with the valve member and an armature gap remains between the inlet valve armature and the inlet valve pole.

The disclosed integrated outlet check valve and pressure relief valve are used in a high pressure fuel pump including a pumping chamber and an outlet fitting defining an outlet passage to a common rail. The pressure relief valve comprises a movable pressure relief valve shuttle including a pressure relief valve surface configured to mate with a pressure relief valve seat in a closed position. The pressure relief valve shuttle moves from the closed position to an open position when pressure in the common rail exerts a force greater than the bias of a pressure relief valve spring. The pressure relief valve shuttle also includes an outlet check valve seat configured to mate with an outlet check valve ball in a closed position. The outlet valve ball moves from the closed position to an open position when pressure in the outlet passage is less than pressure in the pumping chamber.

Disclosed is an air-assisted fuel injection system, comprising a cylindrical bore; a plunger and a barrel within the cylindrical bore, the plunger having a flat surface; and a securing means abutting against the flat surface to keep the plunger from rotating within the cylindrical bore.

A fuel pump includes a fuel pump housing with a pumping chamber; a pumping plunger which reciprocates within a plunger bore; and an inlet valve assembly. The inlet valve assembly includes a check valve member which is moveable between an unseated position which provides fluid communication between the pumping chamber and a fuel supply passage and a seated position which prevents fluid communication between the pumping chamber and the fuel supply passage; and a solenoid assembly which includes a wire winding; a pole piece; an armature which is moveable between a first position when the wire winding is not energized and a second position when the wire winding is energized; a return spring which biases the armature away from the pole piece; and a control rod which is moveable along the inlet valve axis independently of the armature.

A valve assembly for a fuel pump is provided. The valve assembly may include an inlet valve limited to a first range of travel extending between a fully closed position and a fully opened position of the inlet valve, a valve pin coupled to the inlet valve, an armature pin selectively engaging the valve pin, and an armature coupled to the armature pin and limited to a second range of travel extending between an engaged position and a disengaged position that is less than the first range of travel.