| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of restraining a valve opening bounce and improving valve opening responsiveness in a thing for attracting or separating a movable core and a fixed core collaborating with a valve member according to generation and disappearance of an electromagnetic attraction force. SOLUTION: The fuel injection valve comprises a needle 30, the movable core 50 for moving to a seating direction and a separating direction collaborating with the needle, the fixed core 54 for magnetically attracting the movable core against the energizing force energizing it to the seating direction, and a coil 60 for generating an electromagnetic force for magnetically attracting the movable core to the fixed core. The fuel injection valve attracts and separates the movable core and the fixed core by generation and disappearance of the electromagnetic force. In the fuel injection valve, a buffer core 52 as a magnetic body energized in the seating direction is provided between the movable core and the fixed core, a contact area between the buffer core and the fixed core is formed to be larger than a contact area between the buffer core and the movable core, and a second set load energized by the movable core is formed to be larger than a first set load energized by the buffer core. COPYRIGHT: (C)2006,JPO&NCIPI
|
