摘要:
The invention refers to a piezoelectric injector unit, in particular for injecting fuel into a vehicle engine, comprising a housing (10) containing a valve needle (32) for opening and closing a metering opening (31) and a piezoelectrically driven actuator element for actuating the valve needle (32) according to an electrical control voltage. The invention is characterized by the valve needle (32) and the metering opening (31) being part of a functionally independent valve module (30); the actuator element being part of a functionally independent piezoelectric actuator module (20); and both modules being inserted into the rigid housing (10). The invention further refers to a method for producing a piezoelectric injector unit.
摘要:
The proposed fuel injector comprises a fuel passage way in which a harmonic damper 25 is arranged. The harmonic damper dampens the noise and vibration of the fuel injector. The harmonic damper is fixed to the inlet tube of the fuel injector. The harmonic damper has a cylindrical shape with a central bore. An outer face of the harmonic damper is adjacent to an inner face of the inlet tube. The harmonic damper may be made of plastics or metal.
摘要:
The invention relates to a metering device for dosing pressurized fluids, particularly an injection valve for a fuel injection system in an internal combustion engine, comprising a housing (12) having an end part provided with an outlet passage (14) terminating with a metering opening (16), an axially moveable valve needle (20) passing through the outlet passage (14), and controlling opening and closing of the metering opening (16), and a piezoelectric actuator (18) in axial alignment with the valve needle (20) and cooperating with the valve needle (20) to control its axial movement. A plastically deformable adjustment element (22) is arranged axially aligned between a bottom end piece (24) of the piezoelectric actuator (18) and a head (26) of the valve needle (20), wherein a plastic deformation of the adjustment element (22) regulates the axial spacing between the piezoelectric actuator (18) and the valve needle (20), thereby setting a flow rate for the metering device.
摘要:
The invention relates to a metering device for dosing pressurized fluids, comprising a housing (12) with a metering opening, controlled an axially moveable valve needle (26), an axially extendable piezoelectric actuator (18), a thermal compensator unit (20), and an electrical connector (30) for supplying electrical power to the piezoelectric actuator (18). According to the invention the electrical connector (30) comprises a connector body (32) containing a first set of pins (34A, 34B, 36A, 36B) adapted to be connected with an external power supply, and a second set of pins (38A, 38B) electrically connected to the first set of pins (34A, 34B, 36A, 36B) and providing electrical contact to the piezoelectric actuator (18), wherein the first set of pins (34A, 34B, 36A, 36B) is rigidly mounted in the connector body (32) and the second set of pins (38A, 38B) is axially moveably mounted in the connector body (32) to permit rapid axial movement of the thermal compensator unit (20).
摘要:
The invention describes a nozzle (2) for a fuel injector (37) that comprises a simple damping element (1) for protecting a sealing connection between the needle (3) and the nozzle (2) from high pressure waves. The damping element (1) has the shape of a ring plate (1) that is positioned above an upper surface of the nozzle (2). The ring plate (1) is held against the upper surface of the nozzle (2) by a holding member (4). The holding member (4) has basically the shape of a sleeve and is used with a bellow (5) for tightly sealing off an actor chamber (38) from fuel.
摘要:
The invention describes a method for producing a plane common face (8) for an end face (7) of a needle (1) and an end face (8) of a corresponding nozzle (2) of an outwardly opening injector. The nozzle (2) and the needle (1) are produced with shapes, which fit at least roughly together, the needle (1) comprising a closing member (4) with an upper end face (19) with a second sealing face (5) and a lower end face (7) and the nozzle (2) comprising an opening end with an inner end face (18) with a first sealing face (3) and an outer end face (6). Moreover, the needle (1) is inserted into the nozzle (2) from the opening end and pressed with the second sealing face (5) against the first sealing face (3) of the nozzle. Afterwards the lower end face (7) of the needle (1) and the outer end face (6) of the nozzle are grinded to a common plane end face (8), which is at least at the border of the lower end face (7) and the outer end face (6).