| 主权项 |
1. An electromagnetic switch device for a starter configured to start an engine by transmitting torque of a motor thereof to a pinion thereof which is engageable with a ring gear of the engine, comprising:
a pinion-pushing solenoid for pushing out the pinion toward the ring gear, the pinion-pushing solenoid including a first plunger provided with a first coil, the first plunger being configured to be moved within the first coil to an axial end side of the electromagnetic switch device by magnetic force which the first coil generates when being supplied with current, and a first core disposed opposite to the first plunger at the axial end side, the first core forming part of a magnetic circuit of the pinion-pushing solenoid; and a motor-energizing solenoid for energizing the motor, the motor-energizing solenoid including a second coil that generates magnetic force to close a main contact of a power supply circuit of the motor when supplied with current; the electromagnetic switch device operating such that the second coil starts to be supplied with current after the first coil starts to be supplied with current, wherein the electromagnetic switch device further comprises: a stopper that restricts movement to the axial end side of the first plunger to define a maximum movement distance to the axial end side of the first plunger; a second core that forms part of a magnetic circuit of the motor-energizing solenoid, and is disposed so as to be displaced or deformed by an impact pressure caused when the first plunger abuts against the stopper; a detection section that detects a magnetic flux change in the magnetic circuit of the motor-energizing solenoid due to displacement or deformation of the second core; and a current supply-timing determination section that determines timing to start current supply to the second coil based on a result of detection by the detection section. |
