Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
1999-10-08
2001-11-20
Shaver, Kevin (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C335S281000
Reexamination Certificate
active
06318703
ABSTRACT:
The present invention relates to an electromagnetic valve according to the preamble of patent claim
1
.
German patent application No. 40 30 571 discloses an electromagnetic valve which, in its electromagnetically non-energized closed initial position, isolates a pressure fluid passage by way of a valve tappet which abuts on a valve seat in the valve housing. In the electromagnetically energized position of the valve, the magnetic circuit via the yoke ring which largely encloses the coil, via the sleeve member, the magnetic core inserted in the sleeve member, the magnet armature abutting on the magnetic core, the annular piece and the valve housing is closed. The sleeve member is made of a non-magnetic material to prevent a short circuit of the magnetic circuit between the yoke ring and the valve housing. However, the disadvantage is that due to the non-magnetic sleeve member, the magnetic flux is weakened as a result of the magnetic resistance which has to be bridged. Therefore, the construction provides a yoke ring which is deepdrawn relatively far into the interior of the coil in order to counteract this weakening of the magnetic field.
German patent application No. 41 41 546 describes an electromagnetic valve which exhibits a pressure fluid passage between the valve closure member and the valve seat in its electromagnetically non-energized initial position. In this valve, the magnetic circuit of the valve coil is closed by way of the yoke ring, the sleeve member, the magnet armature, the annular piece acting as a magnetic core and the valve housing when the valve coil is energized electromagnetically. To prevent shortcircuiting of the magnetic flux via the yoke ring, the sleeve member and the magnetic core, which would prevent actuation of the magnet armature, the sleeve member is equally made of a magnetically non-conductive material, as mentioned hereinabove with respect to the cited state of the art. The result of the non-magnetic sleeve member is a magnetic resistance which impairs the magnetic flux from the yoke ring to the magnet armature.
An object of the present invention is to improve upon an electromagnetic valve of prior art types of construction to such effect as to achieve, by simple and low-cost provisions, an operationally reliable electromagnetic valve which exhibits a minimum possible weakening of the magnetic circuit between the sleeve member and yoke ring and lends itself to miniaturization.
According to the present invention, this object is achieved in an electromagnetic valve of the generic type by the characterizing features of patent claim
1
. Further, patent claims
11
and
12
disclose appropriate methods of the stroke adjustment of a magnet armature in a valve housing which are also suited for use in an electromagnetic valve of the generic type.
Further features and advantages of the present invention can be seen in the following in the subclaims and two embodiments which will be explained hereinbelow by making reference to the accompanying drawings.
REFERENCES:
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patent: 5476313 (1995-12-01), Lauer
patent: 5511864 (1996-04-01), Reinartz et al.
patent: 5564676 (1996-10-01), Goloff et al.
patent: 5577322 (1996-11-01), Ohshita et al.
patent: 5603483 (1997-02-01), Reuter et al.
patent: 5626326 (1997-05-01), Goosens et al.
patent: 5704587 (1998-01-01), Kuromitsu et al.
patent: 5895026 (1999-04-01), Linkner, Jr. et al.
patent: 6003838 (1999-12-01), Beck
Goossens Andre F. L.
Rottiers Antoine
Bastianelli John
Continental Teves AG & Co. oHG
Rader & Fishman & Grauer, PLLC
Shaver Kevin
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