Fuel injection valve for internal combustion engines
AssigneeRobert Bosch GmbH
InventorFriedrich Boecking
Life of this patent
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Abstract
A fuel injection valve contains a piston-shaped valve needle for closing at least one injection opening at the combustion chamber end of the bore. A conical valve seat at the combustion chamber end of the bore is contacted in the closed position of the valve needle by a valve sealing surface on the of valve needle in order to seal the at least one injection opening. The valve sealing surface includes a first conical surface and a second conical surface and the valve seat contains a first annular groove, which extends in a radial plane of the valve bore, and a second annular groove, which is disposed downstream of and parallel to this first annular groove.
Claims12
A fuel injection valve for internal combustion engines, the injection valve comprising
- a valve body (1) with a bore (3) that contains a piston-shaped valve needle (5) in a longitudinally mobile fashion,
- a pressure chamber (19), which can be filled with fuel formed between the valve needle (5) and the wall of the bore (3),
- at least one injection opening (11) embodied at the combustion chamber end of the bore (3), whereby fuel can flow from pressure chamber (19) to the at least one injection opening (11)
- a conical valve seat (9), which is embodied at the combustion chamber end of the bore (3) and which cooperates with a valve sealing surface (7) embodied on the combustion chamber end of the valve needle (5) in order to control the at least one injection opening (11),
- a first conical surface (30) and a second conical surface (32) are embodied on the valve sealing surface,
- the first conical surface (30) having an opening angle that is smaller than the opening angle of the valve seat (9), which in turn is smaller than the opening angle of the second conical surface (32),
- an annular edge (34) embodied between the two conical surfaces (30;
- 32), and a first annular groove (36), on the valve seat (9) which annular groove extends in a radial plane of the bore (3), and
- a second annular groove (38), on the valve seat (9) which is disposed downstream of and parallel to the first annular groove (36).
Dependencies are inferred from the claim text.