Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1997-04-15
1998-10-13
Morris, Lesley D.
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
239900, F02M 5106
Patent
active
058200320
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A fuel injection valve is described in European Patent No. EP-OS 0 007 724, which has a spherical valve element which can move axially in the valve and likewise serves as the valve closing element. The spherical valve element acts together with a fixed, non-magnetic valve seat, where the one end position of the valve element is fixed in that the valve element rests against the valve seat, when the magnetic coil is not excited. A magnetic inner pole lies exactly opposite the valve seat, with reference to the valve element. When the electromagnetic circuit is excited, the spherical valve element is pulled towards the inner pole, causing it to directly touch a contact surface of the inner pole. The valve is now open. The valve element is surrounded by a magnetic side pole, which represents a magnetic disk with a cylindrical opening. The magnetic field lines run from the side pole to the inner pole via the valve element, where a large radial air gap occurs between the side pole and the valve element, which gap results from the geometry of the cylindrical opening. A further disadvantage consists of the difficulty in handling the inner pole when structuring the contact surface. In forming and applying a surface treatment (coating) to this contact surface, the entire inner pole always has to be handled.
U.S. Pat. No. 4,308,890 describes a similar electromagnetically activated injection valve, which also possesses a spherical valve element. The two end positions of the axial movement of the valve element are again determined by a contact surface on a magnetic inner pole and a fixed valve seat. There is no guidance of the valve element during its axial movement between the two end positions. A ring region projects out from a magnet housing, in the region of the axial expanse of the valve element, up to the vicinity of the valve element. The ring region defines an inner, cylindrical opening region, through which the valve element moves. Here again, there is a large radial air gap between the valve element and the ring region which acts as a side pole. The same disadvantages mentioned above also exist for the electromagnetically activated fluid injection valve known from EP-PS 0 063 952.
SUMMARY OF THE INVENTION
The electromagnetically activated valve according to the present invention, particularly a fuel injection valve, has the advantage that a high level of effectiveness of the magnetic circuit is achieved in a simple and cost-effective manner, since the losses of the magnetic field can be kept very low on the basis of simple design measures.
A soft-magnetic guide element according to the present invention, surrounding a spherical valve element, because of its partial formation as a spherical curve in the region of an inner guide opening, ensures both good guidance of the valve element and an optimum transition of the magnetic field lines to the valve element, because a radial air gap formed between the two can be kept to a minimum.
It is furthermore advantageous that handling of some components of the valve during certain production processes, for example surface treatments, is clearly simplified. A contact element arranged between a core which serves as the inner pole and the spherical valve element can be very easily shaped, as a separate insertion part, can easily be subjected to surface treatment (e.g. coating), and is also easy to install. It is advantageous to make the contact element in the shape of a disk, and to have it pressed against the core by means of a pressure spring, where the guidance of the contact element is provided by means of a non-magnetic intermediate piece.
A particular advantage consists of making the contact element as a large-pore sintered element. The contact element is then sintered from beads which have a diameter in the range of tenths of a millimeter. A fluid can still flow well between the beads which have been sintered together, so that no additional flow channels are necessary. In addition to the simple geometry and ease of production, the larg
REFERENCES:
patent: 4264040 (1981-04-01), Saito
patent: 4308890 (1982-01-01), Saito
patent: 4434765 (1984-03-01), Eshelman
Morris Lesley D.
Robert & Bosch GmbH
LandOfFree
Electromagnetically activated valve, particularly a fuel injecti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electromagnetically activated valve, particularly a fuel injecti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetically activated valve, particularly a fuel injecti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-305296