PURPOSE: To maintain the optimum injection angle by forming, above a gap in a site in which a needle valve is slidingly brought in contact with a valve hole near a tangential port, a larger annular passage than the above gap and enabling the flow rate of fuel, which flows through an injection port, to vary according to the lift of said needle valve.
CONSTITUTION: A tangential port 6 is provided on the outer periphery of a volute chamber 5, as a tangential passage along the tangential direction to the surface, from the end part of each feeding passage 15 provided on the base end face of a nozzle body 7. In a gap 21 in a site 20 in which a needle valve 1 is slidingly brought in contact with a valve hole 2 near said tangential port 6, a larger annular passage 22 than the gap 21 is formed above the gap 21. Therefore, the flow rate of supplied fuel, which flows to an injection port 14 from the gap 21 without rotating, varies with the lift S of the needle valve 1. Due to such a construction, an injection angle suited to a driving condition can be easily obtained as a desired angle.
SAITOU AKINORI
IMAI KENJI
KAWAMURA KIYOMI
KIMURA MASANOBU
| JPS56121860A | 1981-09-24 |