| 摘要 |
<p>A valve actuator to open and close the intake and exhaust valves of an engine utilizing the electromagnetic force generated by an electromagnet. On an intake or exhaust valve (9) is wound in many layers a reciprocally moving magnetic pole (4) composed of an amorphous magnetic material. There are further provided an upper fixed magnetic pole (3a) opposed to one end of the moving magnetic pole (4) and a tip-fixed magnetic pole (3c) opposed to the other end thereof. When the intake or exhaust valve (9) is to be opened, the moving magnetic pole (4) is attracted by the upper fixed magnetic pole (3a). When the intake or exhaust valve is to be closed, the moving magnetic pole is attracted by the tip-fixed magnetic pole (3c). Since the moving magnetic pole (4) is light in weight, a small force is required to open or close the valve, and the valve-driving device is realized in a small size.</p> |
