Abstract: Needle-spring locking device for pump-injectors (injectors) of diesels, in which in order to significantly increase the lift and closing pressures of the nozzle needle, the locking spring (17) is disposed in the central cavity of the body around the outer surface of the plunger's bushing (2) and is connected with the needle (14) via a transversal cross-arm (15) disposed in the plunger bushing (2). This allows for increasing the average diameter of the needle spring (17) from 1.2-1.4 cm to 2-2.5 cm, and the spring power from 35-50 kgf to 180-220 kgf, respectively. In this case, the lift pressure of the nozzle body (10) (when the needle diameter is 0.6 cm) can amount to about 1200 kgf/cm2, and the closing pressure of the nozzle body (10) can amount to about 800 kgf/cm2, which corresponds to maximum injection pressures of 2000-2500 kgf/cm, as required for ensuring greater fuel efficiency and lower exhaust smoke and particle matter emission in future diesels.

Abstract: Actuating mechanism for hydraulically driven pump-injectors for internal combustion engines specifically for diesels, which in order to reduce dimensions of pump-injector body, comprises pressure intensifier with several power pistons and a pumping plunger.

Abstract: Arrangement of joint packing between the pump-injector (injector) body (1) and nozzle body (2) for internal combustion engines, primarily diesels, wherein in order to increase the specific pressures between the faces of joined precision surfaces of pump-injector (injector) body (1) and nozzle body (2) (and also when there is an insert (3) installed between said faces) pressed together by a nut (9), said surfaces have a reduced contact area achieved by bounding these surfaces by a contour line (17) surrounding the channels reaching out to said joints. This allows for reliable sealing (joint packing) between pump-injector (injector) body (1), nozzle body (2), and the face of the insert (3) at high injection pressures (2500 Bar and higher).

Abstract: The fuel injection system for internal combustion engines comprises at least one hydraulically actuated intensifier-injector with inlet (13) and outlet (14) cavities for actuating fluid, one or more interconnected manifolds [rail(s)] (8); with at least one medium pressure pump (5), check valves (8, 9), coarse and fine purification filters (2, 4), a primary pump (3), a sump or tank (1), and electronic control unit (21) and a piping system. The exhaust actuating fluid (19) is fed to the medium pressure pump (5). A cooler (20) is installed between the exhaust of the injector (19) and the inlet (6) of medium pressure pump (5). The system allows driving the medium pressure pump(s) either from the engine crankshaft/camshaft, or autonomously by an electric motor, or by a secondary internal combustion engine. In the two latter cases, the common rail pressure, and respectively the injection pressure, is controlled by modifying the speed of the electric motor or of the secondary internal combustion engine.

Abstract: Hydraulically driven pump-injector for internal combustion engines with hydromechanical return of the power piston (1) via an auxiliary cavity (13).