Claims:We Claim:
1. A fuel injector (100), said fuel injector (100) mountable with respect to a combustion chamber (125) and said fuel injector (100) comprising at least:
- an injector body (105),
- a nozzle body (110) abutting one end of said injector body (105) when said fuel injector (100) is held in assembly position,
- a nozzle needle (140) enclosed in said nozzle body (110),
- a needle tip (145) of said nozzle needle (140),
- a sac (135) that said needle tip (145) leads to, characterized in that:

- a plurality of spray holes (130a) radially positioned across said sac (135).

2. A fuel injector (100) as claimed in claim 1, wherein said spray holes (130a) have one opening on said needle tip (145) and a second opening towards said combustion chamber (125).
3. A fuel injector (100) as claimed in claim 1, wherein said second opening of said spray hole is chamfered.
4. A fuel injection system, said fuel injection system comprising at least:
- a combustion chamber (125) and,
- a fuel injector (100) mountable with respect to said combustion chamber (125),
- said fuel injector (100) comprising at least:
- an injector body (105),
- a nozzle body (110) abutting one end of said injector body (105) when said fuel injector (100) is held in assembly position,
- a nozzle needle (140) enclosed in said nozzle body (110),
- a needle tip (145) of said nozzle needle (140),
- a sac (135) that said needle tip (145) leads to, characterized in that:
- plurality of spray holes (130a) radially positioned across said sac (135).

5. A fuel injection system as claimed in claim 4, wherein said spray holes (130a) have one opening on said needle tip (145) and a second opening towards said combustion chamber (125).
6. A fuel injection system as claimed in claim 4, wherein said second opening of said spray hole is chamfered.
, Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] The present disclosure relates generally to common rail fuel injectors, and more particularly to a plurality of spray holes of common rail fuel injectors.

Background of the invention
[0002] Fuel injectors are used to deliver fuel under high pressure to a combustion space of an engine. It is known to use multi-hole fuel injection nozzles in internal combustion engines, such as diesel engines with direct injection diesel combustion systems. One such multi-hole fuel injection nozzle is disclosed in European Patent No. 1626173 and comprises a nozzle body having concentric valve needles to control the flow of fuel through respective upper and lower spray holes.
[0003] In current common rail fuel injector design, in engine projects where in nozzle is positioned eccentrically with respect to combustion chamber with large offsets in X & Y direction, the spray holes sprays near to the bowl wall in the direction of offset and therefore it will not have sufficient space/room for proper spray development
[0004] Also, in engine project with higher inclination of injector in cylinder head, spray holes in the direction of inclination will have higher spray hole length compared to other and in turn will have relatively poor spray development.
[0005] Consequences of the above issue will lead to impact on customer satisfaction.
[0006] To overcome with the existing issue of poor spray development, it is necessary to correct or to modify the some of the design parameters.

Brief description of the accompanying drawings
[0007] An embodiment of the disclosure is described with reference to the following accompanying drawings,
[0008] Figure 1 illustrates a common rail fuel injector.
[0009] Figure 2 illustrates a common rail fuel injector in accordance with an embodiment of our invention.
[0010] Figure 3 illustrates a common rail fuel injector in accordance with a sectional view of the embodiment of our invention.
[0011] Detailed description of the drawings
[0008] Figure 1 illustrates a common rail fuel injector (100). The common rail fuel injector (100) comprises among other things at least an injector body (105), a nozzle body (110) that abuts from one end of the injector body 9105) when the fuel injector (100) is held in assembly position and a nozzle hole (115) which opens up to the nozzle needle (140) of the fuel injector (100). The nozzle needle (140) ends up to a nozzle needle tip (145). Leading to the nozzle needle tip (145) is a sac (135). The sac (135) of the fuel injector (100) has a plurality of spray holes (130a) radially disposed around it. One end of the spray holes (130) open up to the sac (135), while a second end opens up to a combustion chamber (125).

[0009] In one embodiment of the common rail fuel injector (100), By reducing the spray hole length of spray holes(130a), that is, one or more spray holes, in the direction of injector offset, by means of groove or chamfer or counter bore at exit of the spray holes. Reducing the spray hole length will facilitate complete spray development/atomization within available space there by avoid poor spray development.
[0010] In another embodiment of the invention, by reducing the spray hole length of spray holes (130a), with higher vertical angle or in the direction of inclination, by means of groove or chamfer or counter bore at exit of the spray holes. In nozzle spray holes from entry of spray hole length till exit cavitating characteristic of the spray will reduce, hence with shorter length of spray the losses due to cavitation reduces and spray dispersion/atomization will be improved.
[0011] It must be understood that the embodiments explained in the above detailed description are only illustrative and do not limit the scope of this invention. Any modification to the common rail fuel injector (100) are envisaged and form a part of this invention. The scope of this invention is limited only by the claims.