Abstract: A fuel injector includes a needle moveable along a central axis to initiate and terminate an injection event, and a nozzle body that receives the needle. The nozzle body includes a needle seat, a nozzle sac, and a passageway between the needle seat and the nozzle sac. The passageway defines a passageway inner surface. The nozzle sac has a curved, non-spherical profile and defines a sac inner surface that extends away from a distal end of the passageway inner surface.

Abstract: A unit fuel injector of the type with an open injector comprises an injector body (1) with an axial space (4), which ends in an injector cap (3), an injection plunger (15) guided in the axial space and serving as a closing-off element, which injection plunger forms in the axial space a pressure space (23) from which the injection bores (60, 61) of an upper row (60) and a lower row (61) extend.

Abstract: A fuel-injection nozzle consists of a nozzle housing terminating in a nozzle tip, a pintle guided in the housing, the pintle is pressed by spring action against a conical valve seat in the nozzle tip, the conical valve seat has a plurality of spray holes selectively covered by the conical end of the pintle and passing into a blind hole, the corresponding imaginary cylinder surface area (M) which results, along the extension of each spray hole, between the conical end of the pintle and the conical valve seat being smaller at the end of the first phase of the stroke than the cross-sectional area (Q) of the corresponding spray hole. In order further to improve the emission behavior as a whole, the imaginary cylinder surface area (M) is at most 0.3 times the cross-sectional area (Q) of the corresponding spray hole and the entrance zone into the spray hole is rounded with a radius of at least one-tenth the diameter of the spray hole.

Abstract: A fuel injector for internal combustion engines comprises a nozzle body, having at one end a hollow nozzle tip and a pintle which is axially movable in the nozzle body. The inside surface of the hollow nozzle tip constitutes a conical valve seat which cooperates with a conical valve surface of the pintle to form a valve that is spring-urged closed. The nozzle tip is formed with at least one discharge bore along its inside surface. The inside surface of the nozzle tip terminates in a first sharp edge leading into a blind bore. The conical valve surface of the pintle is terminated adjacent to the blind bore by a second sharp edge.

Abstract: A control system for controlling an internal combustion engine which is provided with at least one fuel injection pump which comprises for the control of the fuel injection pump a control rod, a servomotor, which is adapted to be mechanically coupled to said control rod, and a microcomputer for controlling said servomotor in dependence on operating conditions of the engine and on the position of an arbitrarily operable travel control lever. Means are provided for establishing a direct mechanical connection between the arbitrarily operable travel control lever and the control rod so that the latter can be moved under the control of the travel control lever in case of a failure of the electric system which comprises the sensors, the microcomputer and the servomotor.

Abstract: A fuel injection nozzle for internal combustion engines comprises a nozzle needle (2) guided in a nozzle body (1) and loaded by a helical pressure spring (4). The nozzle needle (2) moves under the pressure of the fuel out of its closure position onto a stop (6) which in turn is loaded by a further but stronger helical pressure spring (7) and limitedly displaceable against the force thereof. The stronger helical pressure spring (7) surrounds the weaker helical pressure spring (4) and the fuel flows through a bore (5) parallel to the spring axis. To achieve a reduction of the external diameter of the injection nozzle in the region of the two springs (4, 7) the latter arranged eccentrically rather than coaxially. Furthermore, between them a preferably likewise eccentric bush (8) is provided through which in the region of its greatest wall thickness the bore (5) for the inflowing fuel extends.

Abstract: In a combination which includes a fuel injection unit and a cylinder of a diesel engine provided with a cover, and formed with a fuel bore communicating with a suction chamber, a piston is reciprocally moving within the cylinder, and is provided with a slanted front and rear control edge for regulating the quantity of fuel. The cylinder and piston define piston- and cylinder-surfaces separated from each other by a very small clearance, and are movable relative to each other; an injection nozzle includes a spring-loaded needle, a common casing houses the piston and the cylinder, a securing flange is disposed between the fuel bore and an end of the cylinder facing the cover, a tensioning device stresses the securing flange against the cover, and the piston, during its stroke, passes over the fuel bore.

Abstract: An injection unit which is associated with a cylinder of a multicylinder diesel engine and comprises an injection nozzle and an injection piston pump which is disposed in a common housing and is driveable by a cam shaft. Said pump comprises a rotatable pump piston which is displaceable in a pump cylinder and has two control edges disposed axially spaced from each other for at least one fuel passage of the pump cylinder. To obtain the desired injection accuracy by accurately observing only a few dimensions during the production and without further tests, measuring and adjusting operations, the pump piston (3) and the pump cylinder (14) each comprise at least one stop face (24, 25) extending transversely preferably normal to the pump longitudinal axis. Said faces cooperate in the basic position of the pump piston (3) assumed in the installation of the unit in the engine directly or indirectly with simultaneous rotational position fixing of the pump piston (3).

Abstract: A fuel injection unit for each cylinder of a diesel engine includes a housing which accommodates a piston pump and an injection nozzle. The piston pump includes a cylinder liner in which a piston runs and controls a flow passage radially extending in the cylinder liner. The flow passage communicates with a supply space which is provided between the housing and the cylinder liner and is divided in vicinity of the flow passage by a baffle sleeve. The so formed two chambers are connected to separate inlet and outlet lines, i.e. that one chamber is connected to the inlet line while the other chamber communicates with the outlet line.

Abstract: A fuel-injecting pump for diesel engines comprises pump cylinders, which are associated with respective engine cylinders and enclose a pump piston, which is adapted to be driven by a camshaft. The pump cylinders are provided with at least one radial fuel port, which at its opening into the pump cylinder is adapted to be closed and opened by the pump piston, which has two axially spaced apart valve edges. The opening of the fuel port into the pump cylinder has in that region which during the discharge stroke of the pump is first reached by the opening valve edge a substantially larger radius of curvature in the peripheral direction than in the adjacent lateral regions. Said opening and the opening valve edge have a common tangent at that point of the opening which is reached last by the opening valve edge during the discharge stroke of the pump.