Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft

M.a.n. Maschinenfabrik Augsburg-Nurnberg A.g.

Eckart Muller

Alfred Urlaub

An injection nozzle for an air-compressing direct injection internal combustion engine which has a combustion chamber in the shape of a body of revolution in the piston head or in the cylinder head, and in which a rotary air movement occurs in the combustion chamber about its longitudinal axis while a portion of the injected liquid fuel is being deposited as a thin film on the wall of the combustion chamber. The injection nozzle has a slot-shaped discharge opening which is so located with regard to the combustion chamber that the fuel spray emitted through this discharge opening, when viewed over its entire width, at nearly the same time impinges upon the combustion chamber wall and spreads thereon in the form of a wide surface film, the cross section of the discharge opening corresponding to the cross section of a one-bore injection nozzle customarily employed for the mixture formation and combustion method under the same conditions.

Injection nozzle for air-compressing direct injection internal

A fuel injector, for internal combustion engines, having a nozzle needle supported in a nozzle body so as to be axially displaceable therein. The nozzle needle, which can be lifted off its valve seat by the pressure of fuel, has a throttling pin which, at least during part of its lift, projects below the valve seat into a bore centrally arranged in the nozzle body. The throttling pin has at least one control edge or flat portion which is shaped and oriented in such a way that the fuel spray direction and/or the fuel spray characteristic or pattern vary with the nozzle needle lift.

Fuel injector for internal combustion engines

A fuel injector for internal combustion engines. The fuel injector is of the pin type and is provided with a nozzle needle which is axially displaceably mounted in a nozzle body and is adapted to be lifted off its valve seat in response to fuel pressure. A throttling pin of the nozzle needle extends below the valve seat into a nozzle bore which is arranged coaxial to the longitudinal axis of the injector. The nozzle bore is provided with a gap eccentrically arranged at one point or over part of the periphery of the nozzle bore.

A fuel injector for internal combustion engines. The fuel injector comprises a nozzle needle which is axially displaceably arranged in a nozzle body and is adapted to be lifted off its conical valve seat in response to fuel pressure. A pin of the nozzle needle extends below the valve seat into a cavity provided in the nozzle body. In the nozzle body, below the cavity, there is provided a blind hole having a diameter smaller than that of the cavity. The pin extends into this blind hole when the fuel injector is closed or slightly opened, providing substantial sealing in a radial direction. At least one spray hole enters the blind hole eccentrically in such a way that a clearance is formed which communicates with the cavity.

A fuel injector for internal combustion engines in which an axially slidable nozzle needle is provided which is capable of being lifted off its seat by the pressure of the fuel against the thrust of one or a plurality of springs and is formed with a pointed tip below the valve seat with at least one spray hole being provided in the nozzle body at an acute angle relative to the nozzle axis. The tip of the nozzle needle is shaped and enters the spray hole or injection bore in such a way that the free cross-sectional area at the injection bore is less than the free cross-sectional area at the seat in nearly all positions of the nozzle needle.

A fuel injector for internal combustion engines having an axially slidable nozzle needle capable of being lifted off its sealing seat by pressure of fuel against at least one spring and having a control pintle below the sealing seat sliding in a blind-hole recess is provided with the improvement comprising a cavity starting immediately below the sealing seat and formed as an eccentric widening extending parallel to the blind-hole type recess, said spray holes opening into said blind-hole type recess and the cross sectional areas of the nozzle seat gap and the cavity at each position of the needle nozzle are greater than the cross sectional area of the at least one spray hole uncovered at any time by the movement of the control pintle.

Growing community of inventors

Schwabach, Germany

Eckart Muller