Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
2011-03-15
2011-03-15
Schneider, Craig M (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C251S077000
Reexamination Certificate
active
07905249
ABSTRACT:
An electromagnetic proportional pressure-control valve of a vehicle transmission which includes a magnet part, a hydraulic part and a spring operatively connecting the magnet part to the hydraulic part. The magnet part includes a coil, an armature and an armature bar. The hydraulic part includes first and second closing elements. The first closing element forms a flat seat and the second closing element a ball seat and the closing elements are opened and/or closed via a tappet rod. When no current is applied to the valve, the second closing element is closed and an gap (ü) in the first closing element is larger than one seventh a nominal width (NW) of the valve. The second closure area (A_2) is larger than a circular area having a diameter corresponding to double the gap and the diameter (s) of the tappet rod is smaller than 0.7 times the diameter (b) of the orifice.
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Mayr Karlheinz
Moosmann Markus
Schmidt Thilo
Davis & Bujold P.L.L.C.
Schneider Craig M
ZF Friedrichsafen AG
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