Fuel injection valve
AssigneeRobert Bosch GmbH
InventorsDavid Pfefferle, Egon Stratmann, Marcus Poindl, Ralf Kromer
Life of this patent
Estimating the term…
Abstract
A fuel injection valve. The fuel injection valve has a support ring is provided on an inlet connection, which engages under the sealing ring on the inlet side. A plastic overmolding forms at least part of a valve housing. The support ring engaging under the sealing ring is positioned on the fuel injection valve in such a way that it rests directly on an upper end face of the plastic overmolding facing the sealing ring, so that the axial support of the sealing ring is provided indirectly via the plastic overmolding. The fuel injection valve is suitable, in particular, for the direct injection of fuel into a combustion chamber of a mixture-compressing external spark-ignition combustion engine.
Claims11
A fuel injection valve for a fuel injection system of an internal combustion engine, the fuel injector configured to inject fuel directly into the combustion chamber of the internal combustion engine, the fuel injection valve comprising:
- an actuator, an excitation of which achieves a lifting movement of a valve needle, as a result of which an actuation of a valve closing body, which together with a valve seat surface forms a sealing seat, is enabled;
- an inlet side inlet connection for a supply of fuel;
- a sealing ring surrounding the inlet connection on the inlet connection;
- a plastic overmolding which forms at least part of a valve housing;
- and
- a support ring which engages under the sealing ring and rests directly on a conically extending upper end face of the plastic overmolding facing the sealing ring, so that an axial support of the sealing ring is provided indirectly via the plastic overmolding, wherein axial forces are transmitted by the sealing ring into the plastic overmolding normal to a conical surface of the upper end face of the plastic overmolding,
- wherein the support ring is supported on a conically extending shoulder, wherein the inlet connection is made of metal and includes the conically extending shoulder, wherein the upper end face of the plastic overmolding and the conically extending shoulder of the inlet connection extend with the same inclination and form a peripheral, uniform, upper slanted end of the valve housing.
A fuel injection valve for a fuel injection system of an internal combustion engine, the fuel injector configured to inject fuel directly into the combustion chamber of the internal combustion engine, the fuel injection valve comprising:
- an actuator, an excitation of which achieves a lifting movement of a valve needle, as a result of which an actuation of a valve closing body, which together with a valve seat surface forms a sealing seat, is enabled;
- an inlet side inlet connection for a supply of fuel;
- a sealing ring surrounding the inlet connection on the inlet connection;
- a plastic overmolding which forms at least part of a valve housing;
- and
- a support ring which engages under the sealing ring and rests directly on an upper end face of the plastic overmolding facing the sealing ring, so that an axial support of the sealing ring is provided indirectly via the plastic overmolding,
- wherein the upper end face of the plastic overmolding extends flat at right angles to a longitudinal axis of the valve,
- wherein, when fluid pressure from the fuel is applied, two force components act via the sealing ring on flanks of a contact surface of the support ring, whereby the support ring elastically deforms in a radially inward and outward direction so that radial gaps between the support ring and walls of a receiving opening are avoided.
Dependencies are inferred from the claim text.