| 摘要 |
PROBLEM TO BE SOLVED: To avoid the generation of excessive operating noise and the deterioration of durability by preventing a collision of an excessive impact force of a movable core with a fixed core during the valve opening operation of a gas fuel injector. SOLUTION: In the electromagnetic driven gas fuel injector 1A, a coil 2a wound to the outer periphery side of the fixed core 2 is energized to form a magnetic passage passing through a yoke 3A, the fixed core 2 and the movable core 4A so that the movable core 4A is attracted to the side of the fixed core 2 to open a valve, and is kept to be energized to hold a valve opening state. A portion formed between the inner periphery side of an insertion hole 30A of the yoke 3A and the outer periphery side of the movable core 4A is provided with an attractive force adjusting structure which forms the magnetic passage to generate the attractive force of the movable core 4A required at least when starting valve opening operation with the energization of the coil 2a and which reduces the attractive force as the movable core 4A approaches the fixed core 2 with the valve opening operation. COPYRIGHT: (C)2010,JPO&INPIT |
