摘要:
The solenoid valve (5) has a fuel feed conduit (7), and a shutter in the form of a ball (12) controlled by an electromagnet (14) and cooperating with a conical seat (13) in the conduit (7). The conduit has a fuel filter (18, 19) for preventing particles of dirt from getting between the seat (13) and the shutter (12), without causing an excessive fall in fuel pressure. The filter (18, 19) is defined by a metal plate (18) having a number of holes (19) of about 0.1 mm in diameter and formed using laser technology; and the plate (18) is fitted to the opposite end (21) of the conduit (7) from the seat (13).
摘要:
The metering valve (24) is controlled by the armature (27) of an electromagnet (26); the travel of the armature (27) towards the electromagnet (26) is arrested by a stop member (71) integral with a flange (73) fitted to a hollow body (12) by a ring nut (96) connecting the skirt (90) of the electromagnet (26); a spacer washer (76) made of elastically compressible material is provided between the flange (73) and a shoulder (74) of the hollow body (12); and the tightening torque of the ring nut (96) compresses the washer (76) accordingly to adjust the travel of the armature (27). According to a variation, a washer (100) of rigid material is provided between the flange (73) and the shoulder (74), and is small in width to form a projecting annular portion (101) of the flange (73), which portion (101) of the flange (73) is flexed accordingly by the tightening torque of the ring nut (96).
摘要:
An accumulator fuel injection apparatus for an internal combustion engine is provided which includes a solenoid-operated fuel injector (1). The fuel injector (1) includes a solenoid valve (20) and a needle valve (220). The solenoid valve (20) establishes and blocks fluid communication between a pressure control chamber (30) supplied with fuel pressure from a fuel inlet (70) and a drain passage (69) formed in a valve body (91) to change fuel pressure within the pressure control chamber (30), thereby bringing the needle valve (220) into engagement with and disengagement from a spray hole (101a). The fuel injector (1) also has a first orifice disc (210) and a second orifice disc (211) installed within the valve body (91). The first orifice disc (210) has formed therein a first orifice (66) which provides a first flow resistance to fuel flowing from the fuel inlet (70) into the pressure control chamber (30). Similarly, the second orifice disc (211) has formed therein a second orifice (67) which provides a second flow resistance smaller than the first flow resistance to the fuel flowing out of the pressure control chamber (30) into the drain passage (69). The second orifice (211) disc is disposed on the first orifice disc (210) so that thicknesswise directions thereof coincide with each other.
摘要:
The invention concerns a fuel-injection valve (1) for high-pressure injection in auto-ignition internal combustion engines, the valve comprising a solenoid valve (23) for controlling the injection process. According to the invention, in order to control this solenoid valve, a control circuit is provided which is divided into a first circuit part and second circuit parts (31) which are disposed on each individual injection valve, separately from the first circuit part which controls a plurality of injection valves together. The housing is clipped onto the fuel-injection valve and has fuel flowing through its interior for cooling purposes.
摘要:
Eine Einspritzdüse zur Verwendung in Common-Rail Systemen, enthält einen mit einem Aktuatorkolben (30) versehenen Düsenkörper (26), der im geschlossenem Zustand der Einspritzdüse an einem Sitz anliegt und stromoberhalb des Sitzes einen mit der Hochdruckleitung des Common-Rail Systems verbundenen Düsenraum (28) begrenzt, einen Arbeitsraum (32) des Aktuatorkolbens (30), welcher über eine Zulaufdrossel (34) mit der Hochdruckleitung verbunden ist, wobei die wirksame Fläche des Aktuatorkolbens (30) größer ist als die im Düsenraum wirksame Fläche des Düsenkörpers, eine vom Arbeitsraum durch eine Rücklauföffnung eines Rücklaufventils (36) führende Rücklaufleitung (14) und eine von einem elektrischen Signal angesteuerte Betätigungseinrichtung zur Betätigung des Ventilgliedes des Rücklaufventils. Die Einspritzdüse ist erfindungsgemäß dadurch gekennzeichnet, daß die Betätigungseinrichtung eine das Ventilglied (38) analog zu dem elektrischen Signal verstellende Einrichtung (40) ist, so daß das Rücklaufventil eine im Querschnitt variable Drossel der Rücklaufleitung (14) bildet. Mit der erfindungsgemäßen Einspritzdüse läßt sich der Einspritzverlauf optimal an die jeweiligen Betriebserfordernisse anpassen.
摘要:
The valve comprises a shutter (67) for the drain conduit (63) of the control chamber (61) of the injector; and an electromagnet (42) having a fixed core (46) with a seat (48) for a coil (47) which is energized to operate the armature (43) controlling the shutter (67). The core (46) presents two coaxial annular pole pieces (72, 73), the outer one (72) of which is shorter than the inner one (73) and fitted with a ring (76) of magnetic material partially closing the seat (48) and enabling a substantial reduction in the diameter of the armature (43). The smaller diameter of the armature (43) enables it to be fitted to the body (6) of the injector by means of a larger-diameter threaded ring nut (82). The armature (43), together with a return spring (89), is fitted to a plate (84) having a sleeve (83) for guiding the stem (69); and the assembly is then fitted to the body (6) independently of the electromagnet (42) by screwing the ring nut (82) inside a seat (93) in the body (6).
摘要:
A valve (5) controlled by an electromagnetic metering valve (41) comprising a head (49) having a control chamber (56), a supply conduit (57), and a drain conduit (58). The head (49) also presents a cavity (67) communicating with the supply conduit (57) and in which a portion (68) of the moving element (8, 28) for closing the injection orifice (11) slides in such a manner as to choke the supply conduit (57) during injection. The supply conduit (57) communicates with a receiving chamber (59) located between a seat (51) in the body (6) of the valve (5) and the outer surface of an appendix (54) on the head (49); and the moving element (8, 28) is pushed into the closed position by the combined action of the pressure at each end, and a spring (37) located close to the injection chamber (19).
摘要:
A pressure-controlled system for supplying compressible fuel to an internal combustion engine is electronically operated. A unit injector assembly for each combustion chamber includes a hydraulic pressure intensifier having input and output chambers, a solenoid valve to control the intensifier, and an accumulator type fuel injector which has a non-return input valve and an accumulator chamber of substantially fixed volume. In operation, a quantity of fuel is first transferred from a pressurized fuel source to the intensifier output chamber, then is further compressed by the intensifier and forced through the non-return valve into the accumulator chamber. The pressure multiplying action starts when an electrical control signal opens the solenoid valve to admit fuel from the fuel source into the intensifier input chamber, and continues progressively until the same signal closes the solenoid valve, relieving the intensifier pressure and thereby causing the non-return valve to close and the injection event to commence. The peak pressure achieved within the accumulator chamber is a function of both the source pressure and the time interval during which it is further pressurized. The mass of the injected fuel charge is determined by that peak pressure. In the operation of the system, provision is made to adjust either the pressure of the fuel source, or the time interval throughout which the further pressurized fuel flows into the accumulator, or both, in order to adjust the mass of each fuel charge that is to be injected.