Fuel injection valve

摘要

One passage for swirling is formed in an orifice plate fixed on a nozzle body. Two swirl chambers in which fuel is caused to swirl so that the fuel has swirling force are provided at an end of the one passage for swirling on the downstream side of the flow direction of fuel. Therefore, the collision between the swirling flow in the swirl chamber and the fuel flowing in the passage for swirling is mitigated, and the swirling flow can be smoothly produced to promote pulverization of sprays injected from fuel injection ports.

主权项

1. A fuel injection valve comprising:
a slidable valve element; a valve seat member having a valve seat formed thereon and an opening at a downstream side, the slidable valve element being seated on the valve seat at a time of valve closing; a passage for swirling provided at each of two opposite downstream sides of a central hole, the passage for swirling communicating with the opening of the valve seat member; at least one swirl chamber formed on a downstream side of the passage for swirling, an entirety of the at least one swirl chamber having a curved inner surface and causing fuel to swirl in an interior of the at least one swirl chamber so as to give swirling force to the fuel; and at least one fuel injection port having a cylindrical shape and being formed in a bottom portion of the at least one swirl chamber, the fuel being injected outside through the at least one fuel injection port, wherein
the passage for swirling has two swirl chambers at a downstream end thereof, the two swirl chambers defining individual chambers,at least two immediately adjacent swirl chambers share a common starting end, the common starting end dividing one stream of fuel flowing from the passage for swirling into two separate streams of fuel such that only one of the two separate streams of fuel flows into each of the at least two immediately adjacent swirl chambers, andfuel in one of the at least two immediately adjacent swirl chambers flows in a clockwise direction, and fuel in another of the at least two immediately adjacent swirl chambers flows in a counter clockwise direction.