Siemens Automotive Corporation

Other

Siemens Aktiengesellschaft

Jingming Jim Shen

Wei-Min Ren

Gyula A Huszar

Bogdan Gromek

Bernhard Fischer

Hans Meixner

Andreas Kappel

Bernhard Gottlieb

Randolf Mock

David P Wieczorek

William A Peterson, Jr

John F Nally, Jr

Debora E Nally

Vernon R Warner

Anthony L Franchitto

Peter C Rice

A fuel injector is provided. The fuel injector also includes a multi-layer orifice plate assembly located at the housing outlet. The orifice plate assembly includes a first orifice plate having a plurality of first openings extending therethrough and a second orifice plate disposed proximate to the first orifice plate. The second orifice plate includes a first face having a perimeter, and a plurality of channels extending radially therethrough to the longitudinal axis. The second orifice plate also includes a second face disposed opposite the first face and a plurality of second openings extending between the first face and the second face. The fuel injector also includes an air assist sleeve disposed about the housing proximate to the outlet. The air assist sleeve includes at least one air channel in communication with the plurality of channels. A method of providing a fuel/air mixture is also provided.

Air assist fuel injector with multiple orifice plates

A fuel injector comprises a body having a longitudinal axis, a piezoelectric actuator that has first and second ends, a needle coupled to the first end of the piezoelectric actuator, and a hydraulic compensator coupled the second end of the piezoelectric actuator. The piezoelectric actuator includes a plurality of piezoelectric elements along the axis between the first and second ends. The needle is movable between a first configuration permitting fuel injection and a second configuration preventing fuel injection. And the hydraulic compensator axially positions the piezoelectric actuator with respect to the body in response to temperature variation. Also, a method of compensating for thermal expansion or contraction of the fuel injector comprises providing fuel from a fuel supply to the fuel injector; and axially adjusting the piezoelectric actuator with respect to the body in response to temperature variation. The axially adjusting includes moving hydraulic oil through an orifice connecting first and second hydraulic oil reservoirs.

Hydraulic compensator for a piezoelectrical fuel injector

A fuel injector comprises a tube assembly, a seat secured at an end of the tube assembly, a stem assembly movable with respect to the seat, a first set of piezoelectric elements connected to the stem assembly, and a second set of piezoelectric elements connected to the first set of piezoelectric elements. The tube assembly has a longitudinal axis extending between a first end and a second end and the seat defines an opening. The stem assembly moves along the axis between a first position wherein the stem assembly contiguously engages the seat such that fuel flow through the opening is prevented and a second position wherein the stem assembly is spaced from the seat such that fuel flow through the opening is permitted. The first set of piezoelectric elements electromechanically extend and contract along the axis in response to a first electric field, and the second set of piezoelectric elements electromechanically extend and contract along the axis in response to a second electric field.

Multiple stack piezoelectric actuator for a fuel injector

A fuel injector with a valve body having an inlet, an outlet, and an axially extending fuel passageway from the inlet to the outlet. An armature proximate the inlet of the valve body. A needle valve operatively connected to the armature. A valve seat proximate the outlet of said valve body. A fault tolerant structural connection between the valve seat and valve body that also provides a hermetic seal between the valve seat and valve body.

Fuel injector having fault tolerant connection

In a plate valve, particularly a cone spray valve, the valve gap, or respectively, seal gap (,) which is present in the open condition is not designed with parallel faces, but with cross-sectional areas which remain the same given increasing radius. This approach applies to a set from the interior outward. The advantage consists in the avoidance of cavitation and in the achievement of a low closing force for sealing the valve.

Plate valve for the dosing of liquids

The injector nozzle includes a cylindrical needle which is axially reciprocated by an armature assembly. The needle has a needle tip terminating in a flat end surface with a spherical transition surface between the flat end surface and the side walls of the needle. Depending upon the diameter of the needle and the included angle of the valve seat, the diameter of the flat end surface may be less than the diameter of the orifice through the valve seat. The circular edge defined between the flat end surface and the spherical transition surface defines a location where the liquid fuel and air consistently separate from the needle in the valve-open condition whereby variations in the spray cone angle and the flow rate are minimized during steady-state and transient operating conditions.

Flat needle for pressurized swirl fuel injector

A fuel injector has a swirl plate about a valve assembly, including a valve seat with an orifice and a valve pin. When the valve is opened, the fuel is swirled by the swirl plate for passage through the orifice. The orifice has a portion which is angled relative to the axis of the injector to provide a conical swirling spray pattern having a conical spray axis angularly related to the axis of the injector. In another form, the orifice is on-axis with the injector and receives a bent tube having an upstream on-axis portion and a downstream angled portion to direct the swirling conical spray at an included obtuse angle relative to the axis of the injector.

Pressure swirl injector with angled cone spray for fuel injection

A shroud member for converting an extending tip fuel injector into an air assist fuel injector wherein the air metering is performed at a distance remote from the O-ring seals holding the injector into the engine manifold.

Extended tip air assist fuel injector

The atomizer is a cap-shaped shroud that contains a flat stamped metal insert. When assembled onto the nozzle of a fuel injector, the atomizer causes the insert to be axially sandwiched between the shroud's end wall and the exterior end of the nozzle. In the zone of sandwiching, the insert has six channels of circumferential discontinuities that in cooperation with the nozzle end and the shroud's end wall define air assist openings for the assist air to flow radially inwardly toward the injected fuel that has just been injected from the nozzle. The six channels are divided into one set of two each angularly spaced channels that are directed to one of the two axis of fuel flow; another set of two each angularly spaced channels that are directed to the other of the two axis of fuel flow; and two diametrically opposed channels lie along a diameter of the disk that is normal to and bisects a diameter that passes through the two axis of the fuel flow.

Air assist atomizer for a split stream fuel injector

An adapter for mounting an air-assisted fuel injector on an engine is a one-piece molded plastic part that includes an integral assist-air supply tube through which assist air enters the adapter and integral attaching catches.

Mounting adapter for air-assist fuel injector

The atomizer is a cap-shaped shroud that contains a stack of flat stamped metal inserts. When assembled onto the nozzle of a fuel injector, the atomizer causes the inserts to be axially sandwiched between the shroud's end wall and the exterior end of the nozzle. In the zone of sandwiching, the inserts have circumferential discontinuities that in cooperation with the nozzle end and the shroud's end wall define air assist openings for the assist air to flow radially inwardly toward the injected fuel that has just been injected from the nozzle. An air assist opening in one insert is thereby both circumferentially and axially offset from an air assist opening in another insert.

Multiple disk air assist atomizer for fuel injection

The atomizer is a cap-shaped shroud that contains a flat stamped metal insert. When assembled onto the nozzle of a fuel injector, the atomizer causes the insert to be axially sandwiched between the shroud's end wall and the exterior end of the nozzle. In the zone of sandwiching, the insert has circumferential discontinuities that in cooperation with the nozzle end and the shroud's end wall define air assist openings for the assist air to flow radially inwardly toward the injected fuel that has just been injected from the nozzle.

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Newport News, VA, United States of America

Jingming Jim Shen