Apparatus for combined blow-injection of fuel and air for fuel injection systems of internal combustion engines

An apparatus for a combined blow-injection of fuel and air for fuel injection systems of internal combustion engines, having a housing including a fuel connection (11), an air connection (12), and a flow-injection opening (20) communicating with said fuel connection and said air connection, an air valve (4), and a fuel valve (42) in said housing, each valve having a valve seat and a valve member disposed in the housing with said valves actuated by an electromagnet, said air valve is located in a communication between said air connection and said blow-injection opening and said fuel valve is located in a communication between said fuel connection and said blow-injection opening for a dosed metering of air and fuel, respectively, said air valve (41) and said fuel valve (42) are disposed concentrically to one another with their valve seats immediately at the blow-injection opening (20) and are embodied such that a valve member (36) of said fuel valve (42), including a valve seat (46) is spring-loaded in a closing direction and lifts outwardly to open the valve away from an associated valve seat (45), and a valve member (23) of said air valve (41) is spring-loaded in the closing direction and lifts inwardly away from an associated valve seat (43), said valve member of said air valve (23), is formed by a hollow shaft and includes said valve seat (45) of the fuel valve (42), said valve member of said air valve (23) is actuatable by an electromagnet (25) which opens said air valve (41) and said fuel valve (42);

• a stroke stop (40) is disposed in a stroke path of the hollow shaft valve member (23) and of the valve member (36) of the fuel valve (42) in such a manner that a maximum stroke path of the hollow shaft valve member (23) is longer than that of the valve member (36) of the fuel valve (42) so that both air and fuel valves (41,42) are opened.