Electrohydraulic valve for controlling a cam shaft phasing mechanism of an internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 4, 2003
Grant Date -
N/A
app pub date -
Aug 6, 2002
filing date -
Aug 6, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magnetic metal within the bobbin. A first pole piece extends into one end of the tube and a second pole piece extends into another end of the tube. A separate bushing is located in an aperture in each pole piece. Each bushing has a tubular body with a first end section that has a larger outer diameter than a second end section and the second end section that has a smaller inner diameter than the first end section. The solenoid further includes an armature that is slidably received in the bushings and engaging the spool.
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