Patent ID: 6029703
Filing Date: 2000-02-29
Classification: F15B,F16K,Y10T

Abstract:
A solenoid control valve comprising:a housing defining an internal chamber therein;an electromagnetic coil wound on a bobbin and coaxially mounted within the housing relative to the internal chamber;a movable armature positioned within the bobbin in the internal chamber and having a first end and a second end;an armature spring in contact with the first end of the armature, said armature spring biasing the armature to a first position within the internal chamber and said armature being movable from the first position to a second position against the bias of the spring upon energizing of the electromagnetic coil;a pole piece mounted to the housing and positioned adjacent to the first end of the armature and defining an air gap therebetween, said pole piece including a flux shunt piece being an annular flange extending towards the armature, said flux shunt piece causing electromagnetic field lines from the coil to extend radially from the armature when the electromagnetic coil is energized so as to weaken the magnetic force on the armature when the armature moves toward the pole piece to the second position;a deep drawn flux tube secured to the bobbin and the housing and acting to define the electromagnetic field lines from the electrical magnetic coil, said flux tube including an annular flange extending around a bottom portion of the tube; anda valve body assembly including a supply port, an exhaust port and a control port, said valve body assembly including a central bore axially aligned with the armature and in fluid communication with the supply port, exhaust port, and the control port, said valve body assembly including a spool valve disposed within the central bore, said valve body assembly further including a spool valve spring that biases the spool valve towards the armature, said flux tube and said housing being connected to the valve body assembly by a plurality of crimped tabs, said annular flange being positioned between the housing and the valve body assembly and said crimped tabs extending from the housing over the flange and being crimped to the valve body assembly.