| 摘要 |
<p>PURPOSE:To separately displace two movable cores in two stages, by providing both a magnetic reluctance means and a bypass means, which enables magnetic flux to bypass the magnetic reluctance means, in a magnetic circuir further allowing a predetermined quantity of magnetic flux to flow in the bypass means. CONSTITUTION:A main unit member 6 provides a throttle part 76, decreasing the sectinal area of a magnetic path for magnetic flux to flow, so as to enable a predetermined quantity of magnetic flux to flow by saturating the magnetic flux flowing even when an electric current supplied to a solenoid coil 2 is increased to a level above the fixed value. Further the main unit member provides an air gap 80 as a magnetic reluctance means between the internal peripheral surface of a protrusive part 78 and the peripheral surface of a movable core 58. This air gap 80 is formed considerably larger than the gap between a movable core 42 and its cylindrical part 10.</p> |
