| 摘要 |
PURPOSE:To make an armature move smoothly, improve response and reduce the noise by perforating-through an oil flow gateway hole in the bottom plane of a core. CONSTITUTION:A solenoid is composed of an armature 4, an exciting coil 3 and a core 2 which is so provided as to cover the lower open end and the front and back side of a hollow core of the exciting coil. The armature 4 is so provided as to be able to move vertically in the hollow core of the exciting coil 3. These components are placed in a case 6 filled with oil 5 for insulation and cooling. An oil flow gateway hole 2b which is continuously connected to the hollow core of the exciting coil 3 is drilled in the bottom plane of the core 2. With this constitution, the oil 5 in the exciting coil 3 can be introduced into and discharged out of the coil 3 efficiently through the gateway hole 2b and the armature 4 can smoothly be moved vertically without producing the impact noise. |
