Nozzle plate for fuel injection unit
AssigneeEnplas Corporation
InventorKoji Noguchi
Life of this patent
Estimating the term…
Abstract
A nozzle hole of a nozzle plate is connected to a fuel injection nozzle of a fuel injection unit through a swirl chamber and first and second fuel guide grooves opened to the swirl chamber. The swirl chamber is an oval recess provided with the nozzle orifice in its center. A first fuel guide groove is opened to one end side of a major axis of the oval recess, and a second fuel guide groove is opened to the other end side of the major axis of the oval recess. The first and second fuel guide grooves are formed such that the same amount of fuel flows to the swirl chamber. The same amount of fuel flowing from the first and second fuel guide grooves to the swirl chamber is guided to the nozzle orifice at the same time while revolving inside the swirl chamber in the same direction.
Claims7
A nozzle plate for a fuel injection unit, comprising:
- a plurality of nozzle orifices configured to face a fuel injection nozzle of the fuel injection unit to allow passage of fuel injected from the fuel injection nozzle through the nozzle plate,
- wherein each of the nozzle orifices is to communicate with the fuel injection nozzle through a respective swirl chamber, a respective first fuel guide groove, and a respective second fuel guide groove opened to the swirl chamber,
- wherein the swirl chamber of each of the nozzle orifices is shaped by bisecting the swirl chamber into a first semi-oval-shaped recess and a second semi-oval-shaped recess offset from each other along a major axis of the swirl chamber to form a surface side of the nozzle plate for facing the fuel injection nozzle as seen in a plan view, the first fuel guide groove opening to an offset portion of the second semi-oval-shaped recess and a first-end side of the first semi-oval-shaped recess with respect to the major axis, and the second fuel guide groove opening to an offset portion of the first semi-oval recess and a second-end side of the second semi-oval recess with respect to the major axis,
- wherein the first fuel guide groove and the second fuel guide groove of each of the nozzle orifices are formed such that an identical amount of fuel flows from the fuel injection nozzle to the respective swirl chamber through each of the first fuel guide groove and the second fuel guide groove,
- wherein a swirl chamber side connecting portion of the first fuel guide groove and a swirl chamber side connecting portion of the second fuel guide groove are formed to be symmetrical with respect to a center of the swirl chamber with respect to an X-axis and a Y-axis extending through a center of the respective nozzle orifice, and
- wherein each of the nozzle orifices is configured such that the identical amount of the fuel flowing from the fuel injection nozzle through the first fuel guide groove and the second fuel guide groove to the swirl chamber is guided to the respective nozzle orifice while revolving inside the swirl chamber in an identical direction.
Dependencies are inferred from the claim text.