Patent ID: 6237550
Filing Date: 2001-05-29
Classification: F01L,F16K

Abstract:
A solenoid-operated valve for use in an internal combustion engine, comprising:a valve body movable into and out of abutment of an intake/exhaust port in the internal combustion engine to close and open an intake/exhaust passage in communication therewith;a moveable plate connected to said valve body by a transmission valve stem;a first solenoid for magnetically attracting said movable plate to cause said valve body to close said intake/exhaust port;a second solenoid disposed in confronting relation to said first solenoid with said movable plate interposed therebetween, for magnetically attracting said movable plate to cause said valve body to open said intake/exhaust port;a piston movable in unison with said transmission valve stem until said valve body closes said intake/exhaust port when said first solenoid magnetically attracts said movable plate to position said valve body closely to said intake/exhaust port; anda cylinder for gradually discharging a fluid filled therein in response to movement of said piston, for thereby causing said transmission valve stem to reduce a speed at which said valve body closes said intake/exhaust port, wherein said transmission valve stem extends from said valve body slidably through said second solenoid and said first solenoid and has an increased-diameter portion disposed between said first solenoid and said movable plate said piston being connected to a moveable member which is movable along said transmission valve stem, said movable member being capable of abutting against said increased-diameter portion to cause said piston to move in unison with said transmission valve stem when said valve body is positioned closely to said intake/exhaust port.