| 摘要 |
<p>A device for actuating a gas exchange valve of an internal combustion engine or gas generator comprises an armature (7) which is operatively connected to the valve stem (2) of a valve member (1) and which is disposed in a chamber (8) between opposed pole faces (5,6) of a valve closing electromagnet (3) and a valve opening electromagnet (4). A gas pressure source (11) is connected by a supply line (12) to the chamber (8). When the electromagnet (3) is energised, it is effective to act on the armature (7) to move the valve member (1) to the closed position. The arrangement is such that reduction of the electromagnetic force exerted on the armature (7) by the electromagnet (3) is effective to enable the gas pressure from the source (11) to move the valve member (1) to the open position. This opening movement of the valve member may be assisted by energising the opening electromagnet (4). Movement of the valve member from the open to the closed position may be assisted by a return spring (10). The valve actuator minimises the electric power consumption for the electromagnets (3,4). In an alternative embodiment, the opening electromagnet (4) is dispensed with and valve movement is achieved by the electromagnet (3) in the closing direction and gas pressure in the opening direction.
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