Patent ID: 6230673
Filing Date: 2001-05-15
Classification: F01L

Abstract:
A solenoid-operated valve for use in an internal combustion engine, comprising:a valve body movable upwardly for closing a passage and movable downwardly for opening said passage, said passage being one of an exhaust passage and an intake passage;a valve stem extending upwardly from said valve body;a pair of upper and lower solenoids spaced from each other in an axial direction of said valve stem and confronting each other vertically, said valve stem extending through said lower solenoid;a movable plate mounted on said valve stem and disposed between said solenoids, said movable plate being movable between said solenoids to cause said valve stem to open and close said valve body in response to being magnetically attracted by said solenoids;a first spring for normally biasing said valve body to open said passage; anda second spring for normally biasing said valve body to close said passage against said first spring;said first spring having a resilient force greater than a resilient force of said second spring, the arrangement being such that said movable plate is positioned between an intermediate position between said upper and lower solenoids and said lower solenoid when said valve body biased by said first and second springs is In equilibrium and said first spring has a resilient force selected to produce a repelling force when said valve body is in an open position, which is greater than a repelling force of said second spring when said valve body is in a closed position, and selected to produce repelling force when said valve body is in the closed position, which is equal to a repelling force of said second spring when said valve body is in the open position.