US5046472A — Apparatus for combined blow-injection of fuel and…

Claim 1

Independent Claim 327 words

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.

Claim 2

Independent Claim 327 words

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.

Claim 3

Dependent Claim 77 words

An apparatus as defined by claim 1, which includes a hollow housing connector (14), said valve seat of the air valve (41) is embodied as an annular shoulder (43) on an inner wall of said hollow housing connector (14) juxtaposed said blow-injection opening (20), and the valve seat (46) of the fuel valve (42) is carried by said valve member (36) that penetrates the hollow shaft valve member (23) and is held in an axially displaceable manner.

Claim 4

Dependent Claim 51 words

An apparatus as defined by claim 2, in which said valve member (36) has a closing head (37) on a face end which has a diameter larger than a diameter of the valve member, and that the valve seat is embodied as a rearward annular shoulder on the closing head (37).

Claim 5

Dependent Claim 98 words

The apparatus as defined by claim 2, characterized in which the valve seat (44) disposed on the hollow shaft valve member (23) and the valve seat (45) for the fuel valve (42) disposed on the hollow shaft (23) are embodied as annular shoulders, inclined approximately at right angles to one another, on the outer and inner wall of the hollow shaft valve (23), and that said annular shoulder (43) on the inner wall of the housing connector (14) and the annular shoulder on the closing head (37), are inclined by approximately 45° relative to the housing axis (50).

Claim 6

Dependent Claim 98 words

The apparatus as defined by claim 3, characterized in which the valve seat (44) disposed on the hollow shaft valve member (23) and the valve seat (45) for the fuel valve (42) disposed on the hollow shaft (23) are embodied as annular shoulders, inclined approximately at right angles to one another, on the outer and inner wall of the hollow shaft valve (23), and that said annular shoulder (43) on the inner wall of the housing connector (14) and the annular shoulder on the closing head (37), are inclined by approximately 45° relative to the housing axis (50).

Claim 7

Dependent Claim 112 words

An apparatus as defined by claim 1, in which said electromagnet (25) has a magnet cup (26) with a cup core (27), magnet coil (28), and a movable armature (31); a first valve closing spring (32) for the air valve (41) is supported on the housing (10) and on the armature (31) and presses the armature against a stop shoulder (33) on the hollow shaft valve member (23), and that a second valve closing spring (39) for the fuel valve (42), having a force direction opposite the force direction of the valve closing spring (32) for the air valve (41), is supported on the housing (10) and on the valve member (36).

Claim 8

Dependent Claim 112 words

An apparatus as defined by claim 2, in which said electromagnet (25) has a magnet cup (26) with a cup core (27), magnet coil (28), and a movable armature (31); a first valve closing spring (32) for the air valve (41) is supported on the housing (10) and on the armature (31) and presses the armature against a stop shoulder (33) on the hollow shaft valve member (23), and that a second valve closing spring (39) for the fuel valve (42), having a force direction opposite the force direction of the valve closing spring (32) for the air valve (41), is supported on the housing (10) and on the valve member (36).

Claim 9

Dependent Claim 112 words

An apparatus as defined by claim 3, in which said electromagnet (25) has a magnet cup (26) with a cup core (27), magnet coil (28), and a movable armature (31); a first valve closing spring (32) for the air valve (41) is supported on the housing (10) and on the armature (31) and presses the armature against a stop shoulder (33) on the hollow shaft valve member (23), and that a second valve closing spring (39) for the fuel valve (42), having a force direction opposite the force direction of the valve closing spring (32) for the air valve (41), is supported on the housing (10) and on the valve member (36).

Claim 10

Dependent Claim 112 words

An apparatus as defined by claim 4, in which said electromagnet (25) has a magnet cup (26) with a cup core (27), magnet coil (28), and a movable armature (31); a first valve closing spring (32) for the air valve (41) is supported on the housing (10) and on the armature (31) and presses the armature against a stop shoulder (33) on the hollow shaft valve member (23), and that a second valve closing spring (39) for the fuel valve (42), having a force direction opposite the force direction of the valve closing spring (32) for the air valve (41), is supported on the housing (10) and on the valve member (36).

Claim 11

Dependent Claim 112 words

An apparatus as defined by claim 5, in which said electromagnet (25) has a magnet cup (26) with a cup core (27), magnet coil (28), and a movable armature (31); a first valve closing spring (32) for the air valve (41) is supported on the housing (10) and on the armature (31) and presses the armature against a stop shoulder (33) on the hollow shaft valve member (23), and that a second valve closing spring (39) for the fuel valve (42), having a force direction opposite the force direction of the valve closing spring (32) for the air valve (41), is supported on the housing (10) and on the valve member (36).

Claim 12

Dependent Claim 139 words

An apparatus as defined by claim 6, in which the hollow shaft valve member (23) protrudes into a fuel-filled chamber (24) disposed downstream of the fuel connection (11) and includes at least one inflow bore (47) that discharges into the hollow shaft valve member interior, and that spring forces of said first and second valve closing spring (32, 39) are adjusted such that the spring force of the second valve closing spring (39) for the fuel valve (42) is greater than the spring force of the first valve closing spring (32) for the air valve (41) but less than the sum of the spring force of the first valve closing spring (32) for the air valve (41) and the pressure force, acting upon the hollow shaft valve member (23), of the fuel pressure prevailing in the fuel-filled chamber (24).

Claim 13

Dependent Claim 139 words

An apparatus as defined by claim 7, in which the hollow shaft valve member (23) protrudes into a fuel-filled chamber (24) disposed downstream of the fuel connection (11) and includes at least one inflow bore (47) that discharges into the hollow shaft valve member interior, and that spring forces of said first and second valve closing spring (32, 39) are adjusted such that the spring force of the second valve closing spring (39) for the fuel valve (42) is greater than the spring force of the first valve closing spring (32) for the air valve (41) but less than the sum of the spring force of the first valve closing spring (32) for the air valve (41) and the pressure force, acting upon the hollow shaft valve member (23), of the fuel pressure prevailing in the fuel-filled chamber (24).

Claim 14

Dependent Claim 139 words

An apparatus as defined by claim 8, in which the hollow shaft valve member (23) protrudes into a fuel-filled chamber (24) disposed downstream of the fuel connection (11) and includes at least one inflow bore (47) that discharges into the hollow shaft valve member interior, and that spring forces of said first and second valve closing spring (32, 39) are adjusted such that the spring force of the second valve closing spring (39) for the fuel valve (42) is greater than the spring force of the first valve closing spring (32) for the air valve (41) but less than the sum of the spring force of the first valve closing spring (32) for the air valve (41) and the pressure force, acting upon the hollow shaft valve member (23), of the fuel pressure prevailing in the fuel-filled chamber (24).

Claim 15

Dependent Claim 139 words

An apparatus as defined by claim 9, in which the hollow shaft valve member (23) protrudes into a fuel-filled chamber (24) disposed downstream of the fuel connection (11) and includes at least one inflow bore (47) that discharges into the hollow shaft valve member interior, and that spring forces of said first and second valve closing spring (32, 39) are adjsuted such that the spring force of the second valve closing spring (39) for the fuel valve (42) is greater than the spring force of the first valve closing spring (32) for the air valve (41) but less than the sum of the spring force of the first valve closing spring (32) for the air valve (41) and the pressure force, acting upon the hollow shaft valve member (23), of the fuel pressure prevailing in the fuel-filled chamber (24).

Claim 16

Dependent Claim 139 words

An apparatus as defined by claim 10, in which the hollow shaft valve member (23) protrudes into a fuel-filled chamber (24) disposed downstream of the fuel connection (11) and includes at least one inflow bore (47) that discharges into the hollow shaft valve member interior, and that spring forces of said first and second valve closing spring (32, 39) are adjusted such that the spring force of the second valve closing spring (39) for the fuel valve (42) is greater than the spring force of the first valve closing spring (32) for the air valve (41) but less than the sum of the spring force of the first valve closing spring (32) for the air valve (41) and the pressure force, acting upon the hollow shaft valve member (23), of the fuel pressure prevailing in the fuel-filled chamber (24).

Claim 17

Dependent Claim 85 words

An apparatus as defined by claim 11, in which said valve member (36) includes a large diameter up end guide section (361) which is axially displaceable in said hollow shaft valve member, the guide section is upstream of said inflow bore 47 that penetrates the hollow shaft wall, said valve member (36) includes an end portion that protrudes beyond the guide section, and includes a retaining spring plate (38) for supporting the valve closing spring (39) and for retaining the fuel valve (42) in place.

Claim 18

Dependent Claim 50 words

An apparatus as defined by claim 2, in which said housing connector (14) is inserted in an air-tight manner into the housing (10), and an interior (192) of said housing connector (14) communicates with the air connection (12) via at least one radial bore (21) in said housing connector (14).

Claim 19

Dependent Claim 98 words

An apparatus as defined by claim 11, in which fuel pressure in the fuel-filled chamber (24) communicates with the fuel connection (11) and is kept constant during engine operation, at approximately 4 bar in the case for intake tube injection and approximately 8 bar for direct injection into the engine cylinders, and that the air pressure present at the air connection (12) is approximately constant and is at a lower pressure than the fuel prsssure and is preferably approximately 1 to 3 bar for intake tube injection and approximately 7 bar for direct injection into the engine cylinders.

Claim 20

Dependent Claim 98 words

An apparatus as defined by claim 16, in which fuel pressure in the fuel-filled chamber (24) communicates with the fuel connection (11) and is kept constant during engine operation, at approximately 4 bar in the case for intake tube injection and approximately 8 bar for direct injection into the engine cylinders, and that the air pressure present at the air connection (12) is approximately constant and is at a lower pressure than the fuel pressure and is preferably approximately 1 to 3 bar for intake tube injection and approximately 7 bar for direct injection into the engine cylinders.

Claim 21

Dependent Claim 98 words

An apparatus as defined by claim 17, in which fuel pressure in the fuel-filled chamber (24) communicates with the fuel connection (11) and is kept constant during engine operation, at approximately 4 bar in the case for intake tube injection and approximately 8 bar for direct injection into the engine cylinders, and that the air pressure present at the air connection (12) is approximately constant and is at a lower pressure than the fuel pressure and is preferably approximately 1 to 3 bar for intake tube injection and approximately 7 bar for direct injection into the engine cylinders.

Claim 22

Dependent Claim 27 words

The apparatus as defined by claim 1, in which said fuel valve (42) is embodied as a throttle tang nozzle with an externally located throttle tang (48).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-09-09	1995-03-11	1995-09-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-09-09	1999-03-11	1999-09-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-09-09	2003-03-11	2003-09-10	$7700.00	Window Closed / Lapsed

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

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