Fuel injection valve

Abstract

A fuel injection valve includes a nozzle body and a plate. The nozzle body includes an injection orifice, through which fuel is injected, a needle that controls the injection through the injection orifice, and a needle-receiving bore that receives the needle. The plate is adjacently provided to the nozzle body for defining a fuel passage therein, through which fuel is supplied to the needle-receiving bore. The plate has an annular groove, which connects the fuel passage with the needle-receiving bore, at an end surface of the plate toward the nozzle body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention, together with additional objectives, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which:

FIG. 1 is a cross-sectional view of a main portion of a fuel injection valve according to one embodiment of the present invention;

FIG. 2 is a plan view of a body-side end surface of a plate of the fuel injection valve shown in FIG. 1; and

FIG. 3 is a plan view of a plate-side end surface of a nozzle body of the fuel injection valve shown in FIG. 1.

Claims

1. A fuel injection valve comprising: a nozzle body that includes: an injection orifice, through which fuel is injected;a needle that controls the injection through the injection orifice; anda needle-receiving bore that receives the needle; anda plate that is adjacently provided to the nozzle body for defining a fuel passage therein, through which fuel is supplied to the needle-receiving bore, wherein the plate has an annular groove, which connects the fuel passage with the needle-receiving bore, at an end surface of the plate toward the nozzle body.

2. The fuel injection valve according to claim 1, further comprising: a cylinder that is provided adjacently to the plate, in the needle-receiving bore, the cylinder defining a hollow, in which the needle slides, wherein:the cylinder divides the needle-receiving bore into an annular passage, which communicates with the annular groove, and a high-pressure chamber, which communicates with the injection orifice, such that a smallest gap between an outer peripheral wall of the cylinder and an opposing inner wall of the needle-receiving bore opposing the outer peripheral wall forms a boundary between the annular passage and the high-pressure chamber; andthe annular groove has a width and a depth such that a sum of an area of a cross section of the annular passage in a circumferential direction and an area of a cross section of the annular groove in the circumferential direction is equal to or more than ½ of an area of a passage cross section of the fuel passage.

3. The fuel injection valve according to claim 1, wherein: the nozzle body includes one of a pin groove and a pin hole, which engages with a pin that positions the nozzle body relative to the plate in a circumferential direction; andthe one of the pin groove and the pin hole is displaced from the annular groove in a radial direction.

4. The fuel injection valve according to claim 1, wherein: the annular groove has a width equal to or greater than a passage diameter of the fuel passage.

5. The fuel injection valve according to claim 1, wherein: the plate includes a recess at the end surface of the plate toward the nozzle body; andthe recess is displaced from the annular groove in a radial direction.

6. The fuel injection valve according to claim 1, wherein: the annular groove has an outer peripheral end, which is located outward of an inner wall of the needle-receiving bore.

7. The fuel injection valve according to claim 6, wherein: the outer peripheral end of the annular groove is located radially outward of the inner wall of the needle-receiving bore.

8. A fuel injection valve comprising: a nozzle body that includes: an injection orifice, through which fuel is injected;a needle that controls the injection through the injection orifice; anda needle-receiving bore that receives the needle; anda plate that is adjacently provided to the nozzle body for defining a fuel passage therein, through which fuel is supplied to the needle-receiving bore, wherein:the plate has a groove, which connects the fuel passage with the needle-receiving bore, at an end surface of the plate toward the nozzle body; andthe groove has a length in a circumferential direction and a width such that an area of an overlapping section between the needle-receiving bore and an opening portion of the groove is equal to or greater than an area of a passage cross section of the fuel passage.

9. The fuel injection valve according to claim 8, wherein: the overlapping section is a communicating section, through which the needle-receiving bore communicates with the opening portion of the groove.