초록 ▼

A fuel injector (3) is driven by a fluid drive system (27) with a drive unit (28). Connected with the fluid drive system (27) is a first control device (38) which has main and auxiliary slides. The fluid in the fluid drive system (27) is independent of the fuel system. Return pistons (72, 74) of the

A fuel injector (3) is driven by a fluid drive system (27) with a drive unit (28). Connected with the fluid drive system (27) is a first control device (38) which has main and auxiliary slides. The fluid in the fluid drive system (27) is independent of the fuel system. Return pistons (72, 74) of the first control device are connected with relief passages (11, 12) on the housing (4) of the fuel injector (3) and with a second control device (50). On the outer periphery of the plunger (7) of the fuel injector (3) are arranged several annular grooves (18, 19, 20) which are connected with the pump chamber (6). The annular grooves (18, 19, 20) cooperate with the relief passages (11, 12) and have control edges. At least one of the annular grooves (18) effects an interruption of the injection of fuel through the nozzle (1). Several valves (51, 53) in the second control device (50 ) regulate the pressure in the pump chamber (6) and control the inflow and outflow of fuel. Pressure surges in the relief passages (11, 12) effect control movements in the first and second control devices (38, 50).

대표청구항 ▼

A fuel injection device for a diesel engine in which an injection nozzle is connected through a pressure line to an injector, which injector has a housing with at least one fuel line for the inflow and outflow of fuel, a pump chamber and a plunger, in which the plunger has at least one annular groov

A fuel injection device for a diesel engine in which an injection nozzle is connected through a pressure line to an injector, which injector has a housing with at least one fuel line for the inflow and outflow of fuel, a pump chamber and a plunger, in which the plunger has at least one annular groove with two control edges and is fluidly connected with the pump chamber, and the housing has a corresponding relief passage for the interruption of pressure build-up in the pump chamber, with the distinction that the plunger (7) is connected with a fluid drive system (27) independent of the fuel system; said drive system (27) includes a drive unit (28), a pressure source (37), and a first control device (38) which can be actuated mechanically and electrically, said first control device (38) including a main slide valve (70) and an auxiliary slide valve (71); said main and auxiliary slide valves each having a return piston (72, 74) acted on by fuel pressure from the pump chamber (6) through a respective line (45, 46); a second control device (50) being located in a fuel line (5, 15) on the injector (3) and includes an inlet relief valve (51) and at least one interruption valve (53), said inlet relief valve (51) having a switching piston (52) located in piston chamber (57) which is connected through a first line (49) with a first relief passage (11) on the injector housing (4) communicating with the pump chamber (6) and connected with the fuel line (15) through a second line (63, 65) having said interruption valve (53) located therein.