Abstract:
A fuel injector (100) for use in an internal combustion engine, the fuel injector comprising: an injector body (10) comprising a bore (11); an injector needle (12) located within the bore and engageable with a needle seat to control fuel injection through an injector outlet (15); an armature member (106), the armature member being engageable with an armature seat (105) on the injector needle (12), the injector needle (12) in part and the armature member (106) in part defining a control chamber (104); an actuator arrangement (44) arranged to control fuel pressure within the control chamber (104) such that fuel pressure variations within the control chamber controls movement of the injector needle relative to the needle seat wherein the actuator arrangement (44) is arranged to be capable of moving the armature member (106) from a seated position in which it engages the armature seat (105) to an unseated position in which the armature member (106) has moved relative to the armature seat in order to bring the control chamber (104) into fluid communication with a low pressure drain (118).
Abstract:
A valve body (5) for a fluid injector (1) having a central longitudinal axis (L) and comprising a one-pieced base body (10) is specified. The base body (10) has a side wall (130) defining a recess (132) extending from a fluid inlet side (12) to a fluid outlet side (11) of the base body (10). The side wall (130) has a thin portion (102), the thin portion (102) having a decreased wall thickness (102) relative to further portions of the side wall (130), which adjoin the thin portion (102) in longitudinal direction (L) towards the fluid inlet side (12) and the fluid outlet side (11), respectively. The valve body (5) comprises a metallic reinforcement jacket (320) which is rigidly coupled to the base body (10) and axially overlaps the thin portion (102) having the decreased wall thickness.
Abstract:
Die Erfindung betrifft ein elektromagnetisch betätigbares Ventil, insbesondere ein Brennstoffeinspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen. Das Ventil umfasst ein elektromagnetisches Betätigungselement mit einer Magnetspule (1), einem festen Kern (2), einem Ventilmantel (5) und einem bewegbaren Anker (17) zur Betätigung eines Ventilschließkörpers (19), der mit einer an einem Ventilsitzkörper (15) vorgesehenen Ventilsitzfläche (16) zusammenwirkt. Außerdem weist das Ventil eine Rückstellfeder (25) zum Rücksetzen des Ventilschließkörpers (19) bis zur Anlage an der Ventilsitzfläche (16) auf. Die Rückstellfeder (25) und eine innere Längsbohrung (23) des Ankers (17) sind derart zueinander gepaart, dass die Führung des Ankers (17) während seiner Axialbewegung ausschließlich entlang der Rückstellfeder (25) erfolgt. Das Ventil eignet sich als Brennstoffeinspritzventil besonders für den Einsatz in Brennstoffeinspritzanlagen von gemischverdichtenden fremdgezündeten Brennkraftmaschinen.
Abstract:
Ein Brennstoffeinspritzventil (1) für Brennstoffeinspritzanlagen von Brennkraftmaschinen umfaßt eine Magnetspule (10), ein als Innenpol der Magnetspule (10) wirkendes Stützrohr (8) und ein Filterelement (19), wobei das Filterelement (19) mit einer Außenkontur (26) eines Stützrohres (8) des Brennstoffeinspritzventils (1) verpreßt ist.
Abstract:
A nozzle body (4) having a fuel injection hole (41), a valve guide (17), a valve disc (5), a mover (6), and a stopper (16) are subjected to low temperature nitriding at 350-480°C. A guide sleeve (14) for guiding the movement of the mover (6) is press fitted to the inner circumference at the forward end of a fixed core (3) wherein the guide sleeve (14) is applied with a hard coating of high hardness nonmagnetic member. An annular tip type valve guide (7) and a guide retainer (18) are disposed, while being stacked, in the nozzle body (4). The guide retainer (18) is made of a metallic material not subjected to nitriding and bonded tightly to the inner circumference of the nozzle body (4) through plastic deformation caused by applying a pressing force from above in the nozzle body (4) thus securing the valve guide (17) by means of the guide retainer (18).
Abstract:
The invention relates to a fuel injection valve for fuel injection systems in internal combustion engines. Said valve comprises an excitable actuation element (8, 18, 19), a valve closing body (14) that can be axially moved along a longitudinal axis (15) of the valve and that cooperates with a fixed valve seat (13) formed on the valve seat body (10) to open and close said valve, in addition to at least one outlet (9) located downstream of the valve seat (13). In view of the fact that the injection valve is embodied in the form of a so-called inward opening valve, the valve closing body (14) moves away from the outlet (9) during the opening movement and the valve closing body (14) moves toward the outlet (9) during the closing movement. The interior of the valve closing body (14) is completely cross-flown and the valve seat body (10) has an inner trough-shaped cavity (21) so that the opening movement of the valve closing body (14) is assisted by the fuel pressure as a result of flow reversal in front of the valve seat (13).
Abstract:
A solenoid actuated fuel injector (10) includes a valve body (14), a valve seat (18), a seating surface (22), a fuel outlet opening (24), a fuel tube (26) for conducting pressurized fuel into the valve body against the seating surface, a spherical valve ball (34) moveable between a closed position and an open position to allow fuel flow through the outlet opening, a spring (36) for biasing the valve ball toward the seated position, an armature (38) axially moveable in the valve body and including a valve ball capturing member (40) at an end proximate the seating surface, the valve ball capturing member being engageable with the ball outer surface adjacent the seating surface and a solenoid coil (44) operable to draw the armature (38) away from the seating surface, thereby moving the valve ball (34) to the open position.
Abstract:
In prior art electromagnetically operated valves, the amount of fluid which flows through the valve when the valve is opened and closed can be adjusted by changing the force exerted by the return spring acting on the valve-closure body. For this to be possible, however, the assembled valve has to incorporate a return-spring adjustment facility in the form of an easily accessible adjustment element. With the method proposed for adjusting the amount of fluid delivered by an electromagnetically operated valve when the valve is opened and closed, the valve-housing cover (10) and wall (9) are displaced with respect to each other, thus varying the critical magnetic cross-section of the choke coil limiting the magnetic flux in the magnetic circuit, until the measured amount of fluid delivered corresponds to the amount required. The method proposed is particularly suitable for electromagnetically operated fuel injection valves in internal-combustion engines.