| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive part structure of a fuel injection device capable of improving responsiveness.SOLUTION: A magnetic throttle 201 in which an inner diameter gradually increases toward a movable element 102 side is provided on an inner peripheral surface of a magnetic core 107. When an electric current is supplied to a coil, magnetization starts from an outer peripheral surface side of the magnetic core 107 located in the vicinity of the coil 105 by an influence of an eddy current, and magnetization proceeds toward an inner peripheral surface of the magnetic core 107. When the current supply to the coil 105 is stopped, demagnetization starts from the outer peripheral surface side of the magnetic core 107. By providing the magnetic throttle 201 on the inner peripheral surface of the magnetic core 107, it becomes possible to shorten magnetic delay time at the valve opening time from the supply of the electric current to the coil 105 to the rise of a magnetic flux, and magnetic delay time at the valve closing time from the supply stop of the electric current to the coil to the decrease of the magnetic flux. Thus, dynamic responsiveness at the opening and closing time of the valve can be improved.SELECTED DRAWING: Figure 2 |
