Valves and valve actuation – Fluid actuated or retarded – Dashpot or fluid controlled retarder or timer
Patent
1998-10-28
2000-12-19
Shaver, Kevin
Valves and valve actuation
Fluid actuated or retarded
Dashpot or fluid controlled retarder or timer
251 48, 25112916, 25112918, F02M 4702, F16K 3102
Patent
active
061618136
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates a solenoid valve for an electrically controlled valve. A solenoid valve of this kind has been disclosed by EP 0 690 223 A2. It is used there to control an electrically controlled fuel injection valve. The valve needle of the fuel injection valve is loaded in the closing direction by a pressure prevailing in a control chamber. The solenoid valve operates in a known manner so that to initiate the injection, it initiates a discharge of the control chamber when the magnet of the solenoid valve is excited and consequently, the valve needle of the injection valve is lifted up from its seat through the action of the high pressure acting on it from the other side. In the solenoid valve, the armature is connected to the armature bolt against which the valve member of the solenoid valve in turn rests.
The disadvantage of the known solenoid valve is comprised in that when operating, an oscillation of the armature and/or rebounding of the valve member can occur, which is particularly disadvantageous if a rapid switching sequence of the solenoid valve is required and an injection should be executed that is divided into a pre-injection and a main injection, controlled by the solenoid valve.
Furthermore, the proposal has already been made to reduce the moving mass of the armature and valve member unit by virtue of the fact that the armature is guided so that it can move in relation to a part connected to the valve member. However, here too, there is a disadvantage in that the armature reverberates after the valve member is placed on its seat. Because of such an oscillation, the armature assumes an indefinite position after a pre-injection, which can result in the fact that in the subsequent main injection, varying opening times of the solenoid valve can occur with the same triggering, which causes a variation in the injection onset or the injection quantity.
ADVANTAGES OF THE INVENTION
The solenoid valve, has the advantage over the prior art that a rebounding of the valve member against its seat and an indefinite reverberation of the armature are prevented so that after a closing of the solenoid valve, the valve member maintains its closed position and after an intentional first deflection movement, the armature rapidly returns to its rest position before the main injection begins. It is also advantageous that a damping of a deflection motion of the armature produced in this way can be achieved without additional parts.
BRIEF DESCRIPTION OF THE DRAWINGS
Four exemplary embodiments of the invention are depicted in the drawings and will be explained in more detail in the description below.
FIG. 1 is a section through a part of an injection valve with the solenoid valve according to the invention in a sectional view, with an armature that can be moved on a bolt that is connected to the valve member of the solenoid valve,
FIG. 2 shows a first embodiment of the invention with a limitation of the armature movement,
FIG. 3 shows a second embodiment with a disk for adjusting the limitation of the armature movement,
FIG. 4 shows a third variant of the invention, with an enlarged strike face of the armature,
FIG. 5 shows a fourth embodiment of the device, with an alternative embodiment of a restoring spring for the armature, and
FIG. 6 shows a diagram over the stroke course of the armature in a closing procedure of the solenoid valve.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 shows a partial section through an electrically controlled injection valve 1 as is known, for example, from the prior art mentioned at the beginning. An injection valve of this kind is designated for use in a fuel injection system that is equipped with a high-pressure fuel reservoir, which is continuously supplied with high-pressure fuel by means of a high-pressure fuel pump and from which this fuel can be supplied at injection pressure to the internal combustion engine by way of individual, electrically controlled injection valves. The injection valve 1, which is shown partially and in a sectional view, addition
REFERENCES:
patent: 4957275 (1990-09-01), Homes
patent: 5110087 (1992-05-01), Studtmann et al.
patent: 5401087 (1995-03-01), Goossens
patent: 5460350 (1995-10-01), Nagashima et al.
patent: 5601275 (1997-02-01), Hironaka
Baumgartner Peter
Drummer Eugen
Renner Johannes
Bastianelli John
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Shaver Kevin
LandOfFree
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