Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1996-06-17
1999-12-07
Weldon, Kevin
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
2395854, 239900, F02M 6100
Patent
active
059962275
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to a valve needle for an electromagnetically actuated valve or to a process for manufacturing a valve needle.
BACKGROUND OF THE INVENTION
The German Patent Application No. 40 08675 already discloses a valve needle for an electromagnetically actuated valve, which is comprised of an armature, a valve-closure member, and a tubular connecting part joining the armature and the, e.g., spherical valve-closure member. The enumerated parts represent individual parts, which are each manufactured separately and are first joined together by means of jointing methods, e.g. laser welding. Thus, there are at least two joints (Points of connection). The armature in this case completely embraces the connecting part radially and axially at least in part, since the connecting part is secured in a longitudinal orifice passing right through the armature. The connecting part, itself, also has a continuously traversing inner longitudinal orifice, in which the fuel can flow toward the valve-closure member and then flow out near the valve-closure member through radially running, crosswise orifices introduced in the inner wall of the connecting part. Therefore, the fuel first flows inside the valve needle and does not leave the valve needle until close to the valve seat.
It has also been disclosed by German Patent No. 42 30 376 to manufacture a valve needle for an electromagnetically actuated valve from a one-piece, tubular actuating part comprised of an armature section and a valve sleeve section by means of injection molding and subsequent sintering in accordance with the metal-injection-molding method (MIM). The actuating part is subsequently joined by a welding connection to a valve-closure member section. Provided in the armature section and the valve-sleeve section is a traversing, inner longitudinal opening, in which fuel can flow toward the valve-closure member section and then emerge out of the valve-sleeve section near the valve-closure member section through crosswise orifices. Thus, in manufacturing the valve needle using the so-called MIM method, slide molds are necessary to form the crosswise orifices.
SUMMARY OF THE INVENTION
In contrast, the advantage of the valve needle and process according to the present invention is that they make it possible to manufacture such a valve needle simply and cost-effectively. This is achieved in accordance with the present invention in that the connecting part is formed as a valve-needle section, in one piece with the valve-closure member section, using a deep-drawing method, so that the tool used to manufacture the deep-drawn part comprised of the valve-needle section and the valve-closure member section can be very simple in design. Transverse slide molds for producing crosswise orifices in the valve-needle section are not needed, since the fuel flows outside of the valve-needle section.
What is also advantageous during the deep-drawing process is that a comparatively simple flat blank of a suitable deep-drawing sheet metal can be used as starting material.
The deep-drawn part is inserted in an inner through-hole of an armature and permanently joined to the armature, e.g., by means of welded seams. Thus, the valve needle according to the present invention merely has a two-part design.
For example, two axially running flow channels inside the armature ensure an unhindered flow of fuel in the direction of the valve seat. The fuel emerging from the flow channels can flow along the periphery of the valve-needle section without being diverted.
What is advantageous is that beads provided in the valve-needle section, which are used to form the flow channels inside the armature, are able to be produced free of burrs, so that contrary to crosswise orifices afflicted with burrs in manufacturing processes known heretofore, no reworking is necessary. Moreover, it is especially advantageous that particles carried along in the fuel or washed-in dirt can settle in the cup-shaped deep-drawn part, so that leakage caused by blockage on
REFERENCES:
patent: 1984751 (1934-12-01), McBride et al.
patent: 2452636 (1948-11-01), Cunningham et al.
patent: 4477027 (1984-10-01), Knapp et al.
patent: 4564145 (1986-01-01), Takada et al.
patent: 4625919 (1986-12-01), Soma et al.
patent: 4946107 (1990-08-01), Hunt
patent: 5040731 (1991-08-01), Yokoyama et al.
patent: 5170987 (1992-12-01), Krauss et al.
patent: 5178362 (1993-01-01), Vogt et al.
Dorsch Ludwig
Reiter Ferdinand
Sefz Werner
Robert & Bosch GmbH
Weldon Kevin
LandOfFree
Valve needle for an electromagnetically actuated valve and proce does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve needle for an electromagnetically actuated valve and proce, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve needle for an electromagnetically actuated valve and proce will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-810234