초록 ▼

A bistable electromechanical transducer is disclosed having an armature reciprocable between first and second positions, a permanent magnet latching arrangement for maintaining the armature in the respective positions, and an electromagnetic repulsion arrangement operable when energized to dislodge

A bistable electromechanical transducer is disclosed having an armature reciprocable between first and second positions, a permanent magnet latching arrangement for maintaining the armature in the respective positions, and an electromagnetic repulsion arrangement operable when energized to dislodge the armature from the position in which the armature was maintained and causing it to move to the other of the positions. In a preferred embodiment, the transducer takes the form of an electronically controllable valve mechanism for use in an internal combustion engine and has an engine valve with an elongated valve stem along with the electromagnetic repulsion arrangement for causing the valve to move in the direction of stem elongation between valve-open and valve-closed positions. An arrangement for decelerating the valve as the valve nears the respective valve-open and valve-closed positions includes at least two separate damping arrangements jointly effective to slow valve motion as the valve gets close to said one position. The damping may include dynamic breaking and energy recovery. The mechanism may also include a housing at least partially surrounding the valve stem and an arrangement for circulating the engine liquid coolant through a portion of the housing.

대표청구항 ▼

An electronically controllable valve mechanism for use in an internal combustion engine comprising: an engine valve having an elongated valve stem; motive means for causing the valve to move in the direction of stem elongation between valve-open and valve-closed positions; means for decelerating the

An electronically controllable valve mechanism for use in an internal combustion engine comprising: an engine valve having an elongated valve stem; motive means for causing the valve to move in the direction of stem elongation between valve-open and valve-closed positions; means for decelerating the valve as the valve nears one of said valve-open and valve-closed positions including at least two separate damping arrangements jointly effective to slow valve motion as the valve gets close to said one position; a latching arrangement for maintaining the valve in one of said valve-open and valve-closed positions; the motive means including an electromagnetic repulsion arrangement operable when energized to override the latching arrangement and dislodge the valve from the position in which the valve was maintained.