Fuel injection device for an internal combustion engine with direct fuel injection, and method for producing it the device
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Life of this patent
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Abstract
A fuel injection device includes at least two valve elements, disposed in a housing and coaxial with one another, with at least one fuel outlet opening associated with each valve element. On the outer valve element, radially outward from the at least one fuel outlet opening associated with it, there is a first sealing edge which cooperates with a valve seat on the housing and can separate the at least one fuel outlet opening from a high-pressure connection. An additional sealing edge is provided on the outer valve element, between the at least one fuel outlet opening associated with it and the inner valve element.
Claims16
In a fuel injection device, for an internal combustion engine with direct fuel injection, having a housing and at least two valve elements comprising:
- an inner valve element and an outer valve element inserted coaxially to one another into the housing;
- at least one first fuel outlet opening disposed in the housing and associated with the outer valve element;
- at least one second fuel outer opening disposed in the housing and associated with the inner valve element;
- a valve seat disposed in the housing which valve seat is engaged and disengaged with the inner valve element and the outer valve element to open and close the associated fuel outlet openings from a high-pressure fuel connection;
- a first sealing region cooperating with the valve seat and disposed on the outer valve element in a location radially outward from the at least one first fuel outlet opening;
- and
- a second sealing region cooperating with the valve seat and disposed on the outer valve element between the at least one first fuel outlet opening and the inner valve element;
- wherein a gap initially exists following initially assembly of the device, between the second sealing region and the valve seat there-opposing the outer valve element in a closed position, wherein the gap is preferably approximately 1 to 2 μm.
In a fuel injection device, for an internal combustion engine with direct fuel injection, having a housing and at least two valve elements comprising:
- an inner valve element and an outer valve element inserted coaxially to one another into the housing;
- at least one first fuel outlet opening disposed in the housing and associated with the outer valve element;
- at least one second fuel outer opening disposed in the housing and associated with the inner valve element;
- a valve seat disposed in the housing which valve seat is engaged and disengaged with the inner valve element and the outer valve element to open and close the associated fuel outlet openings from a high-pressure fuel connection;
- a first sealing region cooperating with the valve seat and disposed on the outer valve element in a location radially outward from the at least one first fuel outlet opening;
- and
- a second sealing region cooperating with the valve seat and disposed on the outer valve element between the at least one first fuel outlet opening and the inner valve element;
- wherein the first sealing region is embodied by a sealing edge of a first annular groove extending around the outer valve element, and wherein the first groove has an approximately semicircular cross-section and wherein at least a portion of the semicircular cross-section of the groove is located generally opposing the at least one first fuel opening.
Dependencies are inferred from the claim text.