| 摘要 |
<p>In an electromagnetic switch (5) for a starter (1), a plunger (39) is housed to face a grounding plate (37) through an air gap (G) in the inner circumference of an attraction coil (38). When the attraction coil (38) is energized and magnetic flux flows in the magnetic circuit, the plunger (39) is attracted toward the grounding plate (37) by the magnetic force. The plunger (39) has a hollow recess (39a) as a variable magnetic resistance member at its bottom end which is opposite to the air gap (G). The hollow recess (39a) extends inwardly from the bottom surface of the plunger (39) by a predetermined length and is closed by a plug body (39b) fitted in the opening to have a closed hollow space. The variable magnetic resistance member may be provided by a reduced diameter part (39c) in place of or in combination with the hollow recess (39a). <IMAGE></p> |
