Patent ID: 8289110

Claim:
An electromagnetic switching device for starters comprising: a solenoid for pinion extrusion comprising: a first coil that forms an electromagnet by energization; a first fixed iron core that is magnetized by the energization to the first coil; and a first plunger that moves in an inner circumference of the first coil in an axial direction by attraction of the magnetized first fixed iron core; a pinion disposed on a starter's output shaft extruded by an engine's ring gear side interlocking with a movement of the first plunger; a solenoid for motor energization comprising: a second coil that forms an electromagnet by energization; a second fixed iron core that is magnetized by the energization of the second coil; and a second plunger that moves in an inner circumference of the second coil in an axial direction by attraction of the magnetized second fixed iron core; a main switch that intermits a current flowing to a starter motor interlocking with a movement of the second plunger; wherein, the solenoid for pinion extrusion and the solenoid for motor energization are arranged in line in an axial direction, there is provided a cylindrical case with a bottom in one side and an opening in another side, the solenoid for pinion extrusion is accommodated in the bottom side of the case and the solenoid for motor energization is accommodated in the opening side of the case to constitute the electromagnetic switching device for starters unitarily, the solenoid for pinion extrusion and the solenoid for motor energization are so constituted that a direction where the first plunger moves by attraction of the first fixed iron core and a direction where the second plunger moves by attraction of the second fixed iron core are in the same direction, the first fixed iron core of the solenoid for pinion extrusion is constituted of a ring-shaped iron core plate arranged at a top side of the case to the first coil, and an iron core part provided unitarily with an inner circumference side of the iron core plate arranged at an inner circumference of the first coil facing the first plunger, the first fixed iron core has its anti-plunger side end surface of the iron core part depressed a predetermined depth D from an anti-coil side end surface of the iron core plate, the solenoid for motor energization has a stopper member made of non-magnetic materials that suppresses a stopping position of the second plunger at the time where the energization to the second coil is stopped, and the stopper member is arranged at a concave portion that is depressed the predetermined depth D of the first fixed iron core.