| 摘要 |
<p>PURPOSE:To simplify a fuel injector in structure as well as to miniaturize it by driving a metering valve in a way of letting a low current flow into a coil and then pressing a movable valve seat with n armature by means of letting a high current flow into the same coil, while making an fuel injection nozzle so as to inject an air-fuel mixture after opening it. CONSTITUTION:During engine driving, first a low current flows into a coil 7 and thereby a small material valve 1 alone is attracted by an armature 8 against a second spring 4. With this magnetic attraction, a ball 13 is separated from an inlet of a fuel passage 11, fuel so far fed to a fuel chamber 5 is guided to this fuel passage 11, and it is further fed to a mixing chamber 6 by way of a hole 11a. Next, a high current is made to flow into the coil 7 and thereby the armature 8 is attracted and moved to some extent by a core 9 in a state that the metering valve 1 is opened, and a movable valve seat 2 is pressed against a first spring 3 via the ball 13, through which a check valve 12 is opened via a rod 24, and then high pressure air and fuel mixture so far run out to the extent of a peripheral passage 23 of the rod 24 from the mixing chamber 6 is injected from the tip of a fuel injection nozzle 22.</p> |
