Abstract: Electromagnetic injector of the pressure-time type, which comprises a toric electromagnet coil (2, 12) of the axisymmetric solid type, housed in a magnetic circuit support (13), as well as a mobile element consisting of a plane plate (3) solid with a liner (4) which moves a suspended needle (18) forming with a seat (45, 19), reverse clack (41) of the injector, the needle being kept at rest by return spring (20).

Abstract: Variable flow pump comprising at least a piston (1) associated with a chamber (2), said piston (1) cooperating with a surface (3) driven in a constant displacement reciprocating movement, characterized in that the piston (1) is free of any continuous mechanical connection with said surface (3); and wherein said chamber (2) is associated with a flow regulating system (9) placed upstream, and wherein it is equipped with a clack valve (7) on the feed and with a clack valve (8) on the delivery; said regulating system (9) being fed by a booster pump (10).

Abstract: A safety device for constant-pressure injection valve of an internal combustion engine. This device blocks the main supply line of the valve permanently and definitely in case the maximum admissible amount of injected fuel is exceeded or the control frequency for a given injected amount, less than the maximum admissible amount, is exceeded. The device is particularly applicable to diesel injection of the pressure-time type.

Abstract: Improvements in electromagnetic control injection systems for diesel engines of the pressure-time type where the injection needle is controlled by the discharging then charging of a chamber. Electromagnetic control fuel injection system for diesel engines in which a three-way solenoid valve is placed in the injection holder, the injector needle being controlled during its opening by the pressure drop of the fuel contained in the control space. A disc having a nozzle is used to throttle the passage assuring the pressure drop in the control chamber without throttling the passage during a rise in pressure so that the injector needle begins to move only after the complete movement of the solenoid valve.

Abstract: A pump injector sends a premetered quantity of fuel to a needle type injector of the type including a piston and a discharge chamber. The injector includes a compression piston mechanically controlled by cam or eccentric having any form. The compression piston compresses fuel within a compression chamber. An injection piston is activated exclusively by the pressure within the compression chamber, opposed by an opposing return spring. The injection piston in turn compresses the fuel in an injection chamber designed to feed the injector. A pressure regulator limits the pressure in the compression chamber to a high, preset value independent of the speed and load of the engine.

Abstract: An electronically controlled device for premetered pressure-time injection using high injection pressure and low feed pressure, which include one source (5-6) of medium pressure (MP) which is intermediate the high and low pressures, a two-stage rotary distributor which cyclically distributes the high and low pressure into single piping systems for each cylinder, a plurality of injection nozzles wherein, in each injector nozzle (30), a metering piston is provided (8) whose delivery chamber (21) is connected to the single piping system, and an injector control piston (11) having a control chamber (31) which is connected, via a three-channel electrovalve (9), through a medium pressure channel for the purposes of initiating injection, and through a second channel to the injection chamber (22) for purposes of initiating metering.