| 摘要 |
<p>A solenoid actuated fuel injector includes a coil housing (26) surrounding a solenoid coil and forming a part of a magnetic circuit which opens an injection valve when the coil is energized. To accelerate closing of the valve upon deenergizing the solenoid coil, the coil housing (26) has narrow slots (46, 47) extending in the direction of the magnetic field to reduce the development and flow of eddy currents in the coil housing (26) which retard collapse of the magnetic field and closing of the valve. The slots extend perpendicular to the direction of eddy current flow and thus increase the electrical resistance to current flow through the coil housing in this direction. They also reduce the amount of magnetic material in the coil housing and so reduce the amount of eddy currents created during field collapse.</p> |
