| 摘要 |
<p>PROBLEM TO BE SOLVED: To decrease an ohm loss of an excitation coil by a method, wherein a coil window in a yoke of an opening magnet, the yoke of a closing magnet and an exciting coil disposed within the coil window are formed as a hollow cylindrical shape. SOLUTION: An electromagnetic valve control aktor is structured, so that when a space up to the yoke of an opening magnet OM is small, a force on an armature plate AP is small, and when a space up to the opening magnet OM is large, the force is large, so that the armature plate AP and the yoke of the opening magnet OM affects a magnetic stroke characteristic curve. In the armature plate AP, a thickness surrounding the hole of a press rod S is increased symmetrically in a radial direction. Furthermore, the yoke of the opening magnet OM is surrounded sideward by the yoke of the opening magnet OM at a position, where the armature plate AP is attracted by the opening magnet OM (when a gas exchange valve is opened). It is possible to minimize the ohmic loss by a coil window SF of a hollow cylindrical configuration and an exciting coil of a hollow cylindrical configuration, having a bottom face of a circular or an oval shape.</p> |
