摘要:
A fuel injector has a valve needle that has a maximum diameter at a flow-off edge, and a valve seat acting together with the valve needle using a sealing seat, the valve seat widening, starting from the sealing seat up to a discharge edge, and the flow-off edge of the valve needle being offset backwards, in relation to the flow direction, with respect to the discharge edge of the valve seat, when the fuel injector is closed. The flow-off edge of the valve needle is offset backwards with respect to the discharge edge of the valve seat in a predetermined range of 2 micrometers to 20 micrometers, in the direction of a longitudinal valve axis.
摘要:
A device for injecting pressurized fuel includes an electrodynamic actuator having a movably situated coil, an outwardly opening needle which opens and closes a cross section on a valve seat, a connecting device which connects the needle to the movably situated coil, a pressure chamber which is situated at the needle upstream from the valve seat and contains pressurized fuel, a low-pressure chamber from which, fuel is dischargeable, and a gap seal which is provided at an outer peripheral region of the needle, the gap seal (16) providing a connection between the pressure chamber and the low-pressure chamber.
摘要:
Damping elements for a fuel injection valve insertable into a receiving conduit of a cylinder head of an internal combustion engine are disposed between a valve housing of the fuel injection valve and a wall of the receiving conduit of the cylinder head. These damping elements, inter alia, decrease acoustic transfer from the fuel injection valve to the cylinder head. It is disadvantageous that conventional damping elements require a great deal of axial installation space with respect to a valve axis and have comparatively high manufacturing costs. With the damping element according to example embodiments of the present invention, the installation space required is reduced. Provision is made, according to example embodiments of the present invention, for the damping element to be in plate-shaped fashion.
摘要:
A fuel injector, e.g., an injector for fuel injection devices in internal combustion engines, has a valve needle with a valve-closure member which cooperates with a valve seat surface in a valve seat body to form a sealing seat, in which the valve seat body has a plurality of injection orifices that are isolated from the fuel supply by sealing seat. The valve-closure member has a pressure element in a recess facing the valve seat body, which is pre-tensioned against the valve seat body by a spring which is supported on the valve-closure member and presses a disc spring against the valve seat body, in such manner that the disc spring covers at least one of the injection orifices, and the spring element uncovers this injection orifice when the tension exerted by the pressure element is removed.
摘要:
The invention relates to a side-channel pump having an intake cover (10), which is used in pumping fuel in a motor vehicle. The intake cover (10) has a side channel (11), extending radially about a pivot point (14) in the intake cover (10), a first opening (13) for an intake channel (27) of the side channel (11) and a constant side channel width (BSK) in a portion extending circumferentially. The side channel (11) has a side channel width (BSK) in the top side (8) that is constant, as seen from a beginning (12) of the side channel (11), already at a value of a first angle (&phgr;) of between 0 and preferably approximately 5 and at most 20 , referred to a line (LB) through the pivot axis (14) and through a contact point (1) at the beginning (12). This makes for better hot-gasoline performance, increased efficiency, and a higher pressure ratio of the side-channel pump. The intake cover is suitable in particular for a dual-flow side-channel pump.
摘要:
The motor fuel delivery unit for delivering motor fuel includes a delivery pump (11) and an electric motor (12) for driving the delivery pump (11). The delivery pump (11) includes a housing (13) provided with a pump chamber (14) and an impeller wheel (16) arranged in the pump chamber (14). The electric motor (12) includes a stator (28) provided with an armature winding (32) and a rotor (29) provided with permanent magnets (30). The electric motor (12) is brushless and consists of the impeller wheel (16) of the delivery pump (11). The stator (28) has an inner ring face consisting of a peripheral wall (143) of the pump chamber (14).
摘要:
Known damping elements (25) for a fuel injection valve (1) insertable into a receiving conduit (2) of a cylinder head (3) of an internal combustion engine are disposed between a valve housing (14) of the fuel injection valve (1) and a wall of the receiving conduit (2) of the cylinder head (3). These damping elements (25), inter alia, decrease acoustic transfer from the fuel injection valve to the cylinder head (3). It is disadvantageous that the damping elements known hitherto require a great deal of axial installation space with respect to a valve axis and have comparatively high manufacturing costs. With the damping element (25) according to the present invention, the installation space required is reduced. Provision is made, according to the present invention, for the damping element (25) to be in plate-shaped fashion.
摘要:
A fuel injector has a piezoelectric or magnetostrictive actuator, which actuates a valve-closure member cooperating with a valve-seat surface to form a sealing seat. A hydraulic coupler includes a master piston, a slave piston, and a coupler volumeformed in-between. The master piston and the slave piston are axially displaceable with respect to one another. The coupler volume is connected to a compensating chamber via a throttle. A flexible section delimits the compensating chamber at least partially, and the coupler volume, the throttle, and the compensating chamber are filled with a hydraulic medium. At least one spring element directly or indirectly exerts pressure on the flexible section from the outside, via fixed components.
摘要:
A fuel injector has a piezoelectric or magnetostrictive actuator, which actuates a valve-closure member cooperating with a valve-seat surface to form a sealing seat. A hydraulic coupler includes a master piston, a slave piston, and a coupler volumeformed in-between. The master piston and the slave piston are axially displaceable with respect to one another. The coupler volume is connected to a compensating chamber via a throttle. A flexible section delimits the compensating chamber at least partially, and the coupler volume, the throttle, and the compensating chamber are filled with a hydraulic medium. At least one spring element directly or indirectly exerts pressure on the flexible section from the outside, via fixed components.
摘要:
An apparatus for direct gasoline injection in a piston engine, which has a hydraulic valve control system with hydraulically actuated gas exchange valves. The direct gasoline injection is associated with the hydraulic valve control system via a pressure booster for two different pressure media, which is acted upon by hydraulic oil from a high-pressure hydraulic oil reservoir of the hydraulic valve control system and which subjects a high-pressure fuel reservoir to high pressure; injection valves for direct gasoline injection in the piston engine are connected to the high-pressure fuel reservoir.