Solenoid type drive and starter using the same

A starter comprising:

• a motor that is mounted to an engine and generates a rotational driving power,
• a power transmission apparatus that transmits the motor's rotational driving power to the engine, and
• a solenoid switch that comprises an exciting coil which is energized and generates magnetic force, a moving core which is a component of a magnetic circuit and is movable in the axial direction, and a fixed core which is located opposite the moving core and is also a component of the magnetic circuit, wherein
• the power transmission apparatus is operated, by action of the solenoid switch, and the motor is energized;
• the moving core and the fixed core are constructed so that the moving core comes in contact with the fixed core while remaining a partial small gap between them when the moving core was attracted to the fixed core by energizing the exciting coil, and
• at least one of the moving core and the fixed core has mechanism which operates so as to decrease the partial small gap.

A starter comprising:

• a motor that is mounted to an engine and generates a rotational driving power,
• a power transmission apparatus that transmits the motor's rotational driving power to the engine, and
• a solenoid switch that comprises an exciting coil which is energized and generates magnetic force, a moving core which is a component of a magnetic circuit and is movable in the axial direction, and a fixed core which is located opposite the moving core and is also a component of the magnetic circuit, wherein
• the power transmission apparatus is operated, by action of the solenoid switch, and the motor is energized;
• at least one of the moving core and the fixed core comprises two or more core elements, and
• the moving core reaches to the fixed core first at one side of the core elements when the moving core is attracted to the fixed core by energizing the exciting coil, and then reaches to the fixed core at the other side of the core elements.

A starter comprising:

• a motor that is mounted to an engine and generates a rotational driving power,
• a power transmission apparatus that transmits the motor's rotational driving power to the engine, and
• a solenoid switch that comprises an exciting coil which is energized and generates magnetic force, a moving core which is a component of a magnetic circuit and is movable in the axial direction, and a fixed core which is located opposite the moving core and is also a component of the magnetic circuit, wherein
• the power transmission apparatus is operated, by action of the solenoid switch, and the motor is energized;
• at least one of the moving core and the fixed core is divided concentrically into two or more core elements,
• a distance (L2) between the moving core and the fixed core at one side of the core elements, at the time of non-energizing the exciting coil, is made shorter than a distance (L1) between the moving core and the fixed core at the other side of the core elements.

A starter comprising:

• a motor that is mounted to an engine and generates a rotational driving power,
• a power transmission apparatus that transmits the motor's rotational driving power to the engine, and
• a solenoid switch that comprises an exciting coil which is energized and generates magnetic force, a moving core which is a component of a magnetic circuit and is movable in the axial direction, and a fixed core which is located opposite the moving core and is also a component of the magnetic circuit, wherein
• the power transmission apparatus is operated, by action of the solenoid switch, and the motor is energized;
• at least one of the moving core and the fixed core is divided into two or more core elements so that the core elements can relatively displace each other in the moving direction of the moving core,
• at the time of non-energizing the exciting coil, two or more different distances corresponding to the core elements are placed between the fixed core and the moving core,
• the relative displacement of the core elements occurs due to impact arisen when the moving core was magnetically attracted to the fixed core by energizing the exciting coil.