摘要:
An electromagnetically actuated valve which achieves the setting of a reduced cross section of flow following a closed position of the valve. The solenoid valve has a seat valve which is surrounded by a sleeve which is secured pressure-tightly on a valve body. In the closed position of the seat valve, a tappet engages in the sleeve, forming a small radial gap. From the interior of the sleeve, a first pressure-medium passage leads to an end face of a magnet armature, said end face being remote from the seat valve. Outside the sleeve, a second pressure-medium passage leads to that end face of the magnet armature which is close to the seat valve. In the case of a pressure drop between the pressure-medium inlet and the pressure-medium outlet of the solenoid valve, the seat valve can assume a partially open position following a closed position of said valve since, due to the gap, which acts as a restriction, a pressure disequilibrium arises at the magnet armature and valve opening forces are compensated. The valve can be employed in slip-controlled hydraulic brake systems of motor vehicles.
摘要:
A fuel injector for the direct injection of fuel into the combustion chamber of an internal combustion engine includes a valve needle situated in a nozzle body, the valve needle being actuable by an actuator and acted upon by a restoring spring in such a manner that a valve-closure member which is in operative connection to the valve needle and faces the combustion chamber is kept in sealing contact with a valve-seat surface in the non-actuated state of the actuator. A first jet-opening angle α1 is assigned to a first lift state of the valve needle and a second jet-opening angle α2 to a second lift state of the valve needle.
摘要:
A fuel injector, in particular for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, includes a valve housing formed by a nozzle body, as well as a sealing ring, which seals the fuel injector against a cylinder head of the engine.
摘要:
A fuel injector, particularly for direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, includes an actuator, a valve needle actuatable by the actuator for actuation of a valve-closure member, which, together with a valve-seat surface forms a sealing seat, and a swirl disk which has at least one swirl channel. An elastic membrane is arranged upstream from the swirl disk in such a way that a metering cross-section of the at least one swirl channel is variable as a function of the fuel pressure prevailing in the fuel injector during operation.
摘要:
A fuel injection valve, especially an injection valve for fuel injection systems of internal combustion engines, includes a piezoelectric or magnetostrictive actuator and a valve-closure member, which can be actuated by an actuator via a valve needle and interacts with a valve-seat surface to form a sealing seat. An intermediate piece is connected via a first flexible seal to a support plate; the support plate is connected via a second flexible seal to a driver at the valve needle; and the driver is connected via a third flexible seal to the intermediate piece, thereby creating a sealed hydraulic translation device.
摘要:
An actuator (1), in particular for operation of fuel injectors in fuel injection systems of internal combustion engines, has in this embodiment a plurality of layers (2) of a piezoelectric or magnetostrictive material arranged in a stack. The actuator (1) is prestressed by a tie rod (6) arranged in a central recess (5) by way of opposing threads (7 and 8). Securing the device and the transfer of force are accomplished by a cover plate (3) and a bottom plate (4). The prestress can also be created by a sheathing (9) surrounding the actuator (1), which transfers an axial force component onto the layers (2) via the cover plate (3) and the bottom plate (4) by flanging of projecting ends (10).
摘要:
A fuel injector, in particular an injector for fuel injection systems in internal combustion engines, has a piezoelectric or magnetostrictive actuator, a valve closing body which can be operated by the actuator by way of a valve needle and which cooperates with a valve seat face to form a sealing seat, and having a hydraulic lifting device including two lifting cylinders that can move in opposite directions. The lifting device is a subassembly hermetically sealed off from a valve interior and has a housing having at least one section which is flexible in the axial direction.
摘要:
A method of metering fuel with a fuel injector, in particular a fuel injector for fuel injection systems in internal combustion engines is described, having a piezoelectric or magnetostrictive actuator and a valve closing body which is operable by the actuator with a valve lift, cooperating with a valve seat face provided on a valve seat body to form a sealing seat. The valve lift may be adjusted variably as a function of a variable control signal triggering an actuator to produce a variable fuel flow at the sealing seat. To produce afitted curve, the fuel flow of the fuel jet sprayed by the fuel injector is measured as a function of the control signal to produce a fitted curve, and a predetermined fuel flow is set with the control signal by using the fitted curve.
摘要:
A fuel injection valve, which may be inserted into a locator bore of a cylinder head of an internal combustion engine, has a sealing ring located peripherally around the fuel injection valve in the locator bore. The sealing ring has a contact surface, having the shape of a spherical segment, toward the fuel injection valve, which presses against a corresponding counter surface, having the shape of a spherical segment, of the fuel injection valve.
摘要:
A fuel injector, especially an injector for fuel-injection systems of internal combustion engines, includes a piezoelectric or magnetostrictive actuator arranged in an actuator space of a valve housing of the fuel injector, the actuator space being sealed from a fuel by a seal. A valve-closure member, which can be actuated by the actuator and interacts with a valve seat to form a sealed seat, assumes the actual valve operation. The seal has a sealing member and a sealing element. The sealing element is joined to the sealing member by a first circumferential welded seam, is elastically deformable and band-shaped, and is joined to the valve housing by a second circumferential welded seam.