| 摘要 |
In a magnetic switch for a starter, an impact force due to return force of a contact pressing coil spring 25 for a plate shaped movable contact 19 is received by a collar 18a formed integral with a movable non-magnetic shaft 18, and an insulative spring stopper member 22 having a cylindrical portion 22a is disposed beneath the contact pressing coil spring concentrically therewith in an overlapping manner along the movable non-magnetic shaft. A hollow cylindrical coil 14 is secured by a casing side plate 16 of a casing 15 and another side plate 17 having a tapered cylindrical protrusion 17a in axial and radial directions with respect to a magnetic core including the side plates 16, 17 and the casing 15. When the movable non-magnetic shaft is an insulative material, the plate shaped movable contact 19 and the contact pressing coil spring 25 are assembled only with the insulative spring stopper member 22, and when the movable non-magnetic shaft 18 is an electrically conductive material, the plate shaped movable contact 19 and the contact pressing coil spring 25 are assembled with the insulative spring stopper member 22 and an insulative washer or bush 23, 24. Thereby, a reliable small size magnetic switch for a starter with a simplified structure can be realized which easily ensures the strength of an impact force receiving portion provided on the movable non-magnetic shaft 18 and endures a large vibration, and of which parts number, manufacturing steps and manufacturing cost are as well reduced.
|
