Patent ID: 6309033
Filing Date: 2001-10-30
Classification: B60T,Y10T

Abstract:
A switchable solenoid valve for use in a braking system having an anti-lock brake mode, comprising:a valve housing having a first fluid port and a second fluid port;a valve seat disposed in said housing and positioned between said first fluid port and said second fluid port, wherein said valve seat includes at least two bores therethrough to fluidly connect said first fluid port to said second fluid port;a valve plate mounted for axial movement within said valve housing to seal against said valve seat, wherein said valve plate includes a center bore formed therein wherein said valve plate is movable between a valve plate open position and a valve plate closed position, said valve plate open position providing a pressure fluid connection between said first and second fluid ports through at least a first of said at least two bores of said valve seat, said valve plate closed position interrupting said pressure fluid connection between said first and second fluid ports through at least a first of said at least two bores of said valve seat; anda tappet mounted for axial movement within said valve housing to seal against said valve seat, said tappet being movable between a tappet open position and a tappet closed position, wherein said tappet open position provides a pressure fluid connection between said first and second fluid ports through at least a second of said at least two bores of said valve seat, said tappet closed position interrupting said pressure fluid connection between said first and second fluid ports through at least a second of said at least two bores of said valve seat,wherein said valve housing further includes a first pressure chamber and a second pressure chamber, said first pressure chamber being disposed on a first side of said valve seat and said first fluid port opening into said first pressure chamber, said second pressure chamber being disposed on a second side of said valve seat and said second fluid port opening into said second pressure chamber,wherein said valve plate has a diameter that is less than a diameter of said first pressure chamber such that a peripheral edge of said valve plate extends to interior walls of said first pressure chamber,wherein said peripheral edge further includes a plurality of notches formed therein, said notches extending radially inwardly from said peripheral edge,wherein said notches are equally spaced apart,wherein said center bore further includes a plurality of radial channels formed thereon, said channels extending radially outwardly from a peripheral edge of said center bore,wherein said valve plate is mounted for axial movement on said tappet.