Patent ID: 6435213
Filing Date: 2002-08-20
Classification: F16H,F16K,G05D,Y10T

Abstract:
A solenoid-operated valve assembly for an automatic transmission of a motor vehicle, comprising:a valve body having a control chamber, mutually spaced first, second and third ports communicating with the control chamber; a valve spool supported for movement along the control chamber, including a shank having an outer surface, a first land having a first land axial length and adapted to open and close the first port, the first land having a feedback bore and a feedback orifice connecting the feedback bore and the second port, wherein the feedback bore has an axial bore length that is not greater than the first land axial length and a second land located at an opposite end of the shank from the first land and adapted to open and close the third port, and wherein the feedback orifice is directed radially and axially from the feedback bore to the outer surface of the shank; a spring urging the valve spool to move along the control chamber; and a solenoid assembly having an armature axially displaceable in response to an electric signal supplied to a coil, the armature urging the valve spool to move along the control chamber.