Internal-combustion engines – Charge forming device – With fuel pump
Patent
1997-12-22
1998-11-03
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
With fuel pump
251 54, F02M 5106
Patent
active
058294139
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a fuel injection device EP-B1-0 195 261 has disclosed a fuel injection device of this kind in which a solenoid valve is provided that has a flat armature which brings the valve member into the closed position counter to the force of an opening spring when the electromagnet is excited. This happens in a undamped manner. When the magnet is not excited, the spring of the solenoid valve moves the armature in the opening direction of the solenoid valve. Only upon reaching its end position does the armature enclose the damping chamber, whose containing walls simultaneously represent the opening simultaneously represent the opening limitation stop of the valve member of the solenoid valve. The damping is carried out chiefly by means of the approach of the flat armature toward the damping chamber and the damping is limited to the last part of the valve opening stroke. The known valve is provided in a valve housing which is installed in a stationary fashion in a fuel injection pump.
ADVANTAGES OF THE INVENTION
The fuel injection device according to the invention has the advantage over the prior art that a damping is continuously effective over the entire stroke of the valve member of the solenoid valve and a small solenoid plunger is used, which has a low mobile mass. This results in a small size and a rapid response behavior of the solenoid valve.
The advantageous improvement results in a structurally very simple embodiment which incorporates the throttle that controls the damping behavior. In a particularly advantageous manner, a throttle of this kind can also be exchanged and the replacement part can also be used to set different throttling and damping effects. In the advantageous improvement, the position of the throttle and with it the volume of the damping chamber can be adjusted by means of pressing the insert piece more or less deeply into the recess and in turn, the dynamic behavior of the throttle effect can thus be controlled.
The improvement results in an optimal configuration of the magnet circuit of the electromagnet and moreover also in a simple realization of a stroke stop for the opening stroke of the valve member.
Finally, the embodiment results in the very advantageous possibility of associating a solenoid valve with a rotating part. It is furthermore advantageous to use fluid already present in the form of fuel as a damping fluid.
BRIEF DESCRIPTION OF THE DRAWING
A partial cross sectional view of an exemplary embodiment of the invention is depicted in the drawing and is explained in detail in the subsequent description.
DETAILED DESCRIPTION
The section of the drawing shows a part of a distributing injection pump as a fuel injection device in which the features essential to the invention are realized. A bush 2 is inserted into a housing 1 of the fuel injection pump and on its interior has in turn a guide bore 5 in which a distributor 7 is guided. This distributor is driven to rotate by means, not shown, and rotates synchronously with the speed of an associated internal combustion engine. It is axially secured against movement in the housing 1 and has a longitudinal conduit 8 which on the one end, communicates with a pump work chamber not shown in detail here and on the other end, feeds into a pressure chamber 9, which is part of a conduit 12 that ends blindly, leads from one end face 10 of the distributor, and is disposed coaxial to the axis of the distributor. The pressure chamber is defined on the one end by a valve seat 14 which transitions into a continuing partial bore 15 of the conduit 12 on the discharge end. The other end of the pressure chamber 9 is adjoined by a coaxial guide bore 16 that emerges from the end face 10 of the distributor.
This is screwed into a magnetic disk 18 and has a keyhole-shaped recess 20. A neck 22 of a valve member 23 of a solenoid valve 24 protrudes through this recess 20 into a narrow part disposed coaxial to the axis of the distributor. This solenoid valve 24 is inserted with its housing 25 into a recess in the hou
REFERENCES:
patent: 5186151 (1993-02-01), Schwerdt et al.
patent: 5478045 (1995-12-01), Ausman et al.
Greigg Edwin E.
Greigg Ronald E.
Moulis Thomas N.
Robert & Bosch GmbH
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