Abstract:
The invention relates to a proportional valve that can be electromagnetically actuated for controlling the delivery rate of a high-pressure fuel pump, comprising an electromagnet (1) for acting on an armature (2) that can be moved in a reciprocating manner, wherein the armature (2) is coupled to an axially movable valve piston (4) by means of a tappet (3) such that the stroke of the armature (2) causes an axial movement of the valve piston (4) against the spring force of a spring (5). According to the invention, the axially movable valve piston (4) is accommodated in a flanged bush (6), by means of which the proportional valve can be connected to a housing part (7) of the high-pressure fuel pump. The invention further relates to a high-pressure fuel pump having such a proportional valve for controlling the delivery rate.
Abstract:
In a pressure control arrangement of a fuel injection system which is operated by way of a pump (12, 100) for an internal combustion engine (32), having a valve (76) which is arranged on the pressure side of the pump (12, 100) for discharging fuel under pressure from the pressure side of the pump (12, 100) to the suction side of the pump (12, 100), a variable restrictor (78) with a modifiable restrictor action is provided on the suction side of the pump (12, 100), in order to restrict the fuel quantity which is fed to the pump (12, 100).
Abstract:
The invention relates to a fuel metering unit, in which the displaceable parts of an electromagnet (1) are guided through two bushings (37, 39) in an axial direction, said bushings being located at a distance from one another. The bushings (37, 39) guide the armature bolt (9), which can be produced from a wear-resistant material, such as for example tempered steel.