Abstract: A single plunger distributor type fuel injection pump for multi-cylinder internal combustion engines having improved features for preventing cavitation in the fuel distribution passages upon fuel cutoff and for providing a uniform residual fuel pressure in the idle fuel distribution passages. The pump does not have the usual delivery valve for maintaining a high residual fuel pressure in the distribution passages. Instead, the passages upon injection termination drain into a spill chamber, the pressure within which builds up to resist fuel flow from the passages and minimize cavitation therewithin. The spill chamber pressure is relieved by a bleed passage opening into the low pressure fuel supply chamber. The pressure in the idle fuel distribution passages is maintained at a low predetermined level by connection of the passages to the fuel supply chamber between injection intervals.

Abstract: The invention relates to an improvement in an engine fuel pump having a fill port in a plunger closed and opened during plunger strokes by a face of a relatively stationary barrel surrounding the plunger. A spill port in the plunger is closed and opened during plunger strokes by a relatively stationary collar surrounding the plunger and a linkage structure is operable by a governor or the like for adjusting the collar axially on the plunger to vary the separation of the barrel face from the collar and thereby the volume of fuel delivered per plunger stroke. The improvement of the invention comprises an oblique surface serving as the barrel face along with apparatus for adjustably setting the angular position of the plunger about its axes and thereby adjusting injection timing.

Abstract: A fuel injection pump for internal combustion engines includes a reciprocating and rotating pump piston. Fuel delivery to the pressure line connected to an injection valve can be interrupted by the opening of a main control orifice in the wall of the cylinder which permits fuel to return to a low pressure volume of the pump. In order to provide for pressure relief of the pressure line when no injection takes place, there are provided a pressure control valve and a pressure relief conduit which bypasses this valve. The pressure relief conduit terminates in an auxiliary control orifice in the wall of the cylinder and is also obturated by the piston during its motion. The two control orifices are so located as to be opened in a predetermined sequence. The piston surface includes portions which block the auxiliary control orifice during engine starting.

Abstract: A pump housing has an upwardly opening cylindrical bore and the bottom of the housing is blinded. Pump elements, such as a tappet and upper and lower spring seats, are slidably disposed in the cylindrical bore, wherein each of the outer diameter of the pump elements is made smaller than the inner diameter of the cylindrical bore, so that those pump elements can be assembled in place in the bore from the top of the pump housing.

Abstract: The inlet of the fuel overflow line of the injection pump is provided with a choke means having at least two choke points disposed in series while a shut-off means is provided for the fuel feed line to prevent a pressure wave from entering the feed line during overflow. Various embodiments are described to show the choke means and shut-off means in separate lines, in parallel in the feed line or within each other in the feed line.

Abstract: A fuel injection pump for internal combustion engines has a single rotating and reciprocating piston which alternately aspirates fuel from a fuel storage compartment and delivers it under pressure to one of several injection lines. Fuel aspiration takes place through a plurality of fuel channels which terminate in the wall of the pump cylinder and whose termini are opened by appropriate grooves in the piston surface. The individual fuel channels are in mutual communication via one or more connection channels and are also connected to the fuel storage compartment via a suction conduit.

Abstract: An injection pump for an air-compressing injection internal combustion engine with at least one pump element that consists of a cylinder and of a piston; the piston is provided with an upwardly disposed control edge for the control of the beginning of the feed of the piston; the control edge thereby changes the beginning of the feed during the rotation of the piston in dependence on the load in such a manner that the beginning of the feed, starting at the idling rotational speed, starts later compared to the feed beginning at full load and is kept essentially constant up to a predetermined load range.

Abstract: A fuel injection system for single or multiple cylinder internal combustion engines comprises two fuel injection valves for each cylinder of an engine. One fuel injection valve operates to inject a principal volume of fuel and the other a secondary volume of fuel into said cylinder. The two injection valves are fed by a plunger which is reciprocable in the working chamber of a pump body. The working chamber of the pump body communicates with a fuel admission duct, a delivery duct for the delivery of a principal fuel volume to the one fuel injection valve and a delivery duct for the delivery of a secondary fuel volume to the other fuel injection valve in such a manner that the duct for the delivery of the principal fuel volume is covered by the plunger after the same has completed a predetermined part of its stroke.

Abstract: In a fuel injection pump having two kinds of plungers rotatably displaced by a common rack, each of one kind of plungers ceasing fuel supply and each of the other kind of plungers supplying fuel during idling of an engine, a measuring screw-like groove of each plunger ceasing fuel supply during idling of the engine has a longitudinal groove communicating with a plunger pump chamber. The longitudinal groove is of relatively enlarged width, and a cut portion crossing at a right angle to said longitudinal groove is provided at the intersection of the longitudinal groove and the upper edge of the screw-like groove. The depth of this cut portion increases toward the longitudinal groove.

Abstract: A slotted bush disposed about and connected by a cotter to a pump plunger is rotatable by a control rod.

Abstract: The hydraulic head comprises a cylinder forming a pump chamber and comprising at least one fuel supply orifice formed in its cylindrical wall. A pump piston is adapted to move in said cylinder, and a delivery connector is connected to the cylinder. This connector is provided externally with a shoulder adapted to constitute an axial stop for the hydraulic head, against a support surface of the pump casing comprising housings adapted to receive said hydraulic heads. The delivery connector, comprises, in addition, internally, a delivery valve, the end portion of the cylinder turned towards the delivery connector comprising, on its outer surface, fixing means adapted to cooperate with complementary fixing means provided on the inner surface of a housing of the delivery connector adapted to receive said end portion of the cylinder. Thus, in the fully assembled hydraulic head, said cylinder is directly suspended on the delivery connector.

Abstract: A fuel injection pump for internal combustion engines includes a pump piston whose simultaneous reciprocation and rotation distributes pressurized fuel to the several injection nozzles of the engine. In order to shift the onset of fuel injection towards a later time during the delivery stroke of the piston, relief channels are disposed in the piston and in the surrounding cylindrical bushing. An annular slide, moving coaxially with respect to the piston, cooperates with the terminal apertures of one or more of these relief channels to relieve the fluid pressure in the working chamber of the pump, thereby interrupting fuel injection to the nozzles of the engine.