Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1998-03-11
1999-11-30
Weldon, Kevin
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
2395854, 239900, B05B 130
Patent
active
059920181
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a valve needle for an electromagnetically actuatable valve and a process for manufacturing a valve needle. DE 44 20 176 A1 now U.S. Pat. No. 5,820,031 has already disclosed a valve needle for an electromagnetically actuatable valve, which is comprised of an armature, a connecting piece, and a valve closing member connected to the armature by means of the connecting piece. The connecting piece is made of a semi-finished product that has a profiled cross section. In order to assure at least one sufficiently large flow conduit for the medium between the circumference of the connecting piece and the wall of a containing opening in the armature into which the connecting piece protrudes, the connecting piece has a relatively large expanse perpendicular to its longitudinal axis, which results in a relatively high mass for the valve needle, which leads to a delay of the valve actuation produced by an electromagnet.
ADVANTAGES OF THE INVENTION
The valve needle according to the invention, and the process for manufacturing a valve needle have the advantage of a simply embodied valve needle which has a low mass and can therefore be actuated more rapidly by the electromagnet. The connecting piece, which is formed out of a rod-shaped semi-finished product or wire with a circular cross section, permits sufficiently large flow conduits between the armature head and the armature in spite of the small diameter because of the embodiment according to the invention.
Advantageous embodiments and improvements of the valve needle are possible by means set forth herein.
The cross sectional shapes of the armature head can be easily manufactured and result in sufficiently large flow conduits through the armature.
The embodiment of a collar on the armature head brings the advantage that when the collar contacts the armature, there is an association that can be precisely predetermined between the armature and the connecting piece.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are shown in a simplified form in the drawings and explained in detail in the description that follows.
FIGS. 1 to 3 each shown an exemplary embodiment of a valve needle embodied according to the invention, in a partially sectional representation, and
FIGS. 4 to 10 each shown a top view of a valve needle embodied according to the invention, with an armature.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
FIG. 1 shows a first exemplary embodiment of a valve needle 1 embodied according to the invention, which is for an electromagnetically actuatable valve, in particular for an injection valve for fuel injection systems of internal combustion engines. The valve needles described in FIG. 1 and in the Figs. that follow are used, for example, in an injection valve for fuel injection systems as shown and described in DE 44 20 176 A1. The valve needle 1 is comprised of a connecting piece 2, a valve closing member 3, and an armature 4 made of magnetically conducting material. The valve closing member 3 in the current exemplary embodiment is of one piece with the connecting piece 2 and is embodied as a section of a ball on the lower end of the connecting piece 2. The connecting piece 2 is made of a rod-shaped semi-finished product or a wire that has a circular cross section and a diameter of approximately 1.8 mm to 2.5 mm, and in fact, is made of stainless steel. The connecting pieces 2 are separated from the rod-shaped semi-finished product or wire so they have a predetermined length, e.g. they are sawed or cut out. An armature head 7 is embodied on the upper end of the connecting piece 2 remote from the valve closing member 3 and has a nonround cross section perpendicular to a longitudinal axis 8 through the connecting piece 2, with a greater expanse perpendicular to the longitudinal axis 8 than the section 9 of the connecting piece 2 between the armature head 7 and the valve closing member 3, which has a circular cross section. The armature head 7 is manufactured through the cold forming of the upper end of the con
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Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Weldon Kevin
LandOfFree
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