Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1992-02-12
1992-12-15
Rosenthal, Arnold
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112915, 2395854, F16K 3106, F02M
Patent
active
051709872
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetically actuable fuel injection valve.
An electromagnetically actuable fuel injection valve is known comprising a valve housing, a valve seat body provided with a bore and a valve seat, a valve closing element extending into the bore to cooperate with the valve seat and which carries on its end remote from the valve seat an armature, a compression spring which urges the armature and the valve closing element toward the valve seat and an inner pole of a magnetic coil having a stop face located opposite the armature.
U.S. Pat. No. 4,700,891, which corresponds to DE-OS 35 35 124, has already disclosed a fuel injection valve of this kind. In the latter, an internal pole of a magnetic coil forms a direct stop surface for an armature of a valve closing element. The valve closing element has a needle-shaped valve closing body. Spherical valve closing bodies are also customary for fuel injection valves.
When the fuel injection valve is excited the valve closing element is displaced axially with the valve closing body to such an extent that the valve seat is cleared and the fuel can be sprayed. The displacement of the fuel closing body in the opening direction is effected by means of the force of the magnetic coil, through which current flows, on the armature. The motive friction of the valve closing body in the bore on the valve seat body, in particular in the case of canting as a result of skewing, leads to hysteresis errors in the driving of the fuel injection valve and skewing of the valve closing element additionally leads to a non-uniform fuel jet shape. This results in a degraded fuel preparation and differences in the fuel supply of the individual cylinders of internal combustion engines. The wear in the region of the valve seat and the armature caused by the canting leads to further functional impairments.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved electromagnetically actuable fuel injection valve having none of the above-described disadvantages.
This object and others which will be made more apparent hereinafter is attained in an electromagnetically actuable fuel injection valve comprising a valve housing, a valve seat body provided with a bore and a valve seat; a valve closing element extending into the bore to cooperate with the valve seat and carrying an armature on an end of the valve closing element remote from the valve seat; a compression spring positioned to act on the armature and urge the armature and the valve closing element toward the valve seat and an inner pole of a magnetic coil having a stop face. The inner pole is positioned so that the stop face is opposite to the armature.
According to the invention a lift-limiting plate is arranged between the armature and the stop face and a bearing plate is located between the lift-limiting plate and the compression spring and is acted on by the compression spring. The lift-limiting plate on the stop face side thereof is provided with a curved receiving surface and a peripheral outer plane annular face connected with the curved receiving surface, the bearing plate has a pressing surface shaped to fit the curved receiving surface in which the bearing plate is seated under action of the compression spring. The peripheral outer plane annular face is located opposite the stop face and on its armature side the lifting-limiting plate has a curved bearing surface which fits a correspondingly curved bearing surface of the armature so that the lift-limiting plate is supported with the curved bearing surface of the lift-limiting plate engaged in the correspondingly curved bearing surface of the armature.
The fuel injection valve according to the invention has in contrast with the above the advantage that the valve closing body is no longer canted even when the spring is askew or in the event of fitting errors of the guides or of the stop faces, but rather is automatically centered with minimal friction and wear. A more precise, more ra
REFERENCES:
patent: 4509693 (1985-04-01), Nakai
patent: 4944486 (1990-07-01), Babitzka
Krauss Rudolf
Reiter Ferdinand
Robert & Bosch GmbH
Rosenthal Arnold
Striker Michael J.
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