A valve assembly for a fluid injector is disclosed. The valve assembly includes a valve body having a longitudinal axis, an armature, a valve needle having a needle tip and a damping element. The armature and the damping element include penetrating first openings in which the valve needle is arranged. The damping element is fixed to the valve needle and arranged between the armature and the needle tip with respect to the longitudinal axis to attenuate a movement of the valve needle relative to the valve body during the operation of the valve assembly.

An object of the present invention is to provide a fuel injection valve configured to suppress bouncing of a valve element that is caused as a result of the valve element being rendered elastic when the valve element collides with a valve seat. The fuel injection valve of the present invention includes the valve element configured to come into contact with the valve seat for closing an injection hole and to separate from the valve seat for unclosing the injection hole, an elastic member urging the valve element toward the valve seat, a movable iron core disposed to be in and out of contact with the valve element, a fixed iron core disposed to be opposed to the movable iron core, and a coil configured to generate electromagnetic force for moving the movable iron core. At least one lower rigidity part having reduced rigidity per axial unit length is provided between a surface where urging force of the elastic member is transmitted to the valve element and a seat part whereat the valve element comes into contact with and separates from the valve seat.

A valve (or fuel injector), which provides that the valve-seat member exhibits high structural strength and fatigue strength under vibratory stresses, includes an excitable actuator for actuating a valve-closing member which, with a valve-seat face on the valve-seat member, forms a sealing seat, and injection openings which are downstream of the valve-seat face, the injection openings being in a center area of the valve-seat member projecting outwardly dome-like in the injection direction. The dome-like center area has a curved outer contour, the curvature in a radially inner section having a larger radius than the radius of the curvature in a radially outer section of the dome, which ends radially outside the mouth areas of all injection openings, in a recessed depression, that is followed radially outwardly by an axially projecting edge area of the valve-seat member. The fuel injector directly injects fuel into a combustion chamber of an engine.

A decoupling element for a fuel injection device is characterized in that a low-noise configuration is implemented, and includes at least one fuel injector and a receiving borehole in a cylinder head for the fuel injector, and the decoupling element is introduced between a valve housing of the fuel injector and a wall of the receiving borehole. The decoupling element has a bowl- or cup-shaped configuration, and includes a radially outer contact area and a radially inner contact area with which the decoupling element is radially inwardly and radially outwardly placeable against the fuel injector and a shoulder of the receiving borehole. The radially inner contact area of the decoupling element has a contact surface that corresponds to a convexly curved countersurface on the fuel injector. The fuel injection device is for the direct injection of fuel into a combustion chamber of a mixture-compressing spark ignition internal combustion engine.

The decoupling element is for a fuel injection device, in which a low-noise configuration is implemented, and includes at least one fuel injector and a receiving borehole in a cylinder head for the fuel injector, and the decoupling element is introduced between a valve housing of the fuel injector and a wall of the receiving borehole. The decoupling element has a bowl- or cup-shaped configuration, and includes a radially outer contact area and a radially inner contact area with which the decoupling element is radially inwardly and radially outwardly placeable against the fuel injector and a shoulder of the receiving borehole. The radially inner contact area of the decoupling element has a spherically convex contact surface whose curvature has a largely constant spherical radius. The fuel injection device is particularly suited for the direct injection of fuel into a combustion chamber of a mixture-compressing spark ignition internal combustion engine.

A decoupling element for a fuel injection device is characterized in that a low-noise configuration is implemented. The fuel injection device includes at least one fuel injector and a receiving borehole in a cylinder head for the fuel injector and the decoupling element between a valve housing of the fuel injector and a wall of the receiving borehole. The decoupling element has a bowl- or cup-shaped configuration, and includes a radially inner contact area with which the decoupling element is radially inwardly placeable against the fuel injector. At least one further decoupling element is provided that has a bowl-shaped or cup-shaped configuration and is in direct contact with the other decoupling element. The fuel injection device is particularly suited for the direct injection of fuel into a combustion chamber of a mixture-compressing spark ignition internal combustion engine.

An injector for a combustion engine may include a valve housing, a valve needle, an electromagnetic actuator, and a damping element. The valve needle may be axially movable within a valve cavity of the housing. The electromagnetic actuator may comprise a pole piece coupled with the valve housing and an armature axially movable within the valve cavity. The pole piece may have a central recess extending axially there through. The central recess may include a step defining a first portion and a second portion, the first having a larger cross-sectional area than the second, and a stop surface defined by a radially extending surface of the step. The valve needle may include an armature retainer in the first portion of the central recess. The armature may be axially displaceable with respect to the valve needle and interact with the valve needle by means of the retainer for actuating the valve needle. The damping element may be arranged between the stop surface and the armature retainer to interact with the valve needle and the pole piece during movement.

A holder serves for fastening a component, in particular a fuel distributor, onto an internal combustion engine. A holding element that has a component-side connecting segment is provided. The holding element is connectable at the component-side connecting segment to the component. The holding element furthermore has a fastening-means-side connecting segment at which the holding element is fastenable via a fastening means onto the internal combustion engine. A receiving part and a fastening sleeve are provided. The receiving part serves to connect the fastening sleeve to the fastening-means-side connecting segment of the holding element. The fastening sleeve has a through opening through which the fastening means is guidable. An assemblage having such a holder is also described. A connecting method is furthermore described.

In a valve apparatus, a housing includes a plurality of through holes through which a fluid flows. A first valve member opens and closes a first through hole. A second valve member opens and closes at least one second through hole. A fixed core does not move relative to the housing. A coil forms magnetic field. A first movable core moves integrally with the first valve member. When the coil forms the magnetic field, a magnetic attractive force is generated between the first movable core and the fixed core. A second movable core moves integrally with the second valve member. When the coil forms the magnetic field, a magnetic attractive force is generated between the second movable core and the fixed core. A magnetic constriction portion is provided between the fixed core and the first movable core. The second through hole is opened after the first through hole is opened.

A bearing bush is for a holder, which is for fastening a component, particularly of a fuel distributor, to an add-on structure. The bearing bush has an inner bush part, which is made of a metallic material, and an outer bush part, which is made of a metallic material, and an elastically deformable damping element. The outer bush part has a continuous recess, in which the inner bush part is situated. The damping element is situated between the inner bush part and the outer bush part. A holder having such a bearing bush is also specified. In addition, a fuel-injection system having a fuel distributor and at least one holder is specified, which is used for fastening the fuel distributor on an internal combustion engine.