Claims:We claim:
1. A nozzle (102) for a fuel injector (10), said nozzle (102) comprising at least a nozzle body (104) and a needle (106), said nozzle body (104) comprising a spray hole (108);
- Characterized in that a counter bore (110) located at the operative bottom of the spray hole (108) where said counter bore (110) has a diameter greater than the diameter of the spray hole (108).
2. The nozzle (102) as claimed in claim 1, wherein counter bore (110) occupies thirty percent of the length of the spray hole (108).
3. The nozzle (102) as claimed in claim 1, wherein counter bore (110) is bored onto the nozzle body (104).
4. A fuel injector (10), said fuel injector (10) comprising at least:
- an injector body;
- a nozzle (102), said nozzle (102) comprising at least a nozzle body (104) and a needle (106);
- a spray hole (108), said spray hole (108) located in the nozzle body (104); and
- a counter bore (110).
5. The fuel injector (10) as claimed in claim 4, wherein the counter bore (110) is located at the operative bottom of the spray hole (108) of the nozzle body (104).
, Description:Complete specification: The following specification particularly describes the invention and the manner in which it is to be performed. 
Field of the invention:
[0001] The invention relates to a fuel injector and particularly relates the nozzle of the fuel injector.

Background of the Invention:
[0002] A person skilled in art would be aware that many version of fuel injectors are already known. However, some basic components in a fuel injector are always present. Following are some of the basic components of any fuel injector known in the state of the art viz the injector body components, the magnet group components, electrical connector components, nozzle module components and the like. With regard to this disclosure we will specifically focus on the nozzle module of a fuel injector, with emphasis on the spray hole of the nozzle of a fuel injector.
[0003] In conventional fuel injectors, the nozzle comprises of spray holes with diameters of spray hole varying in microns based on the type of engine and requirement of fuel based on the type of vehicle. The diameter of spray hole determines the quantity of fuel fed to the engine per injection of the injector.
[0004] However, the combustion of the injected fuel leading to carbon being generated lead to coking of the spray holes, wherein layers of carbon coats the inner surface of the spray hole. Over time, the coking in turn reduces the diameter of the spray hole and thereby reduce the volume of fuel injected by the fuel injector. This ultimately will lead to a reduction in the performance of the engine and the vehicle itself.
[0005] Therefore, there exists a need for a solution to counter the coking of the spray hole and maintain the fuel injected by the injector, as described in this disclosure.

Brief Description of Drawings:
[0006] An embodiment of the disclosure is described with reference to the following accompanying drawings,
[0007] Fig. 1 illustrates a fuel injector, according to an embodiment of the present invention;
[0008] Fig. 2 illustrates a nozzle of a fuel injector with spray hole and counter bore, according to an embodiment of the present invention; and
[0009] Fig. 3 illustrates a spray hole and counter bore of the nozzle of a fuel injector, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0010] Fig 1 illustrates a fuel injector (10), according to an embodiment of the present invention. The fuel injector (10) comprises of at least an injector body and a nozzle (102).
[0011] Fig. 2 illustrates the nozzle (102) of the fuel injector (10), according to an embodiment of the present invention. The nozzle (102) comprises of at least a nozzle body (104) and a needle (106), wherein said nozzle body (104) comprises of at least one spray hole (108). The spray hole (108) comprises of a counter bore (110) located at the operative bottom of the spray hole (108). This counter bore (110) is created such that it has a diameter greater than the diameter of the spray hole (108).
[0012] Fig. 3 illustrates this spray hole (108) and the counter bore (110) of the nozzle (102) of the fuel injector (10), according to an embodiment of the present invention. The counter bore (110) is created such that the counter bore (110) is bored onto the nozzle body (104).
[0013] In one embodiment of the invention disclosed herein, the counter bore (110) is bored during the time of manufacturing such that it is at least thirty percent in length with respect to the length of the whole spray hole (108). The counter bore (110) is characterized such that the length and the diameter does not have an impact on divergent angle of fuel spray.
[0014] The counter bore (110) as described in the disclosure, is aimed at reducing the coking on the spray hole (108). The coking is a common occurrence due to production of carbon during combustion, as described in the background. However, the introduction of counter bore will reduce the amount of deposit due to coking and thereby aid in maintenance of the performance and the volume of fuel injected by the fuel injector (10).
[0015] The invention as described in the disclosure aids in eliminating and providing multiple advantages along with reduction of coking on the spray hole. The main advantage of the reduced coking is the benefit on engine performance which normally drops due to coking but will be maintained within specification due to the reduced coking. The counter additionally reduces the total length of spray hole (108) and allows for less deposition of carbon on surface.
[0016] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.