Claims:We claim:
1. A fuel injector (10) comprising at least an injector body (106) and a nozzle (102), said injector body (106) inserted in a cylinder head (104) in an operative configuration of said fuel injector (10);
- Characterized in that a sleeve (108) provided along the length of the injector body (106) that is inserted in the cylinder head (104).
2. The nozzle (102) as claimed in claim 1, wherein sleeve (108) is composed of a material with lower deformity.
3. The nozzle (102) as claimed in claim 1, wherein sleeve (108) comprising a thro hole (110).
, 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 to the injector body and cylinder head 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 injector body and the cylinder head of a fuel injector.
[0003] Currently existing designs of fuel injectors, the injectors are mounted at engine cylinder are guided with upper guidance and lower guidance at the engine cylinders region. These designs lead to wear or rubbing marks a on the upper and lower guidance regions, as well as the nozzle guide bore region and valve piece guidance. This not only lead to higher injector back flow quantity to the fuel tank of vehicle or system but also to mechanical failure of the injector in the field like nozzle shaft breakages.
[0004] The existing designs also lead to component wear or rubbing marks seen at nozzle guide and valve guide region, resulting in high fuel back leak or back pressure, further leading to an increase in fuel tank temperature. The designs also have negative effects on the performance of high pressure pump as well as an increased back flow or back pressure in the cumulative return line increases, which further lead to rail pressure build up failure probable.
[0005] Existing designs of fuel injectors may also result in injection quantity drift which can go above acceptable limits, resulting in performance and emission issues. Additionally since the fuel injector is guided at only two regions, namely the upper guidance and the lower guidance, due to axial load injector experiencing banana bending effect, this may lead to nozzle shaft breakages.
[0006] Therefore, there is a need for a better solution to prevent such wear of injector body, as described in this disclosure.

Brief Description of Drawings:
[0007] An embodiment of the disclosure is described with reference to the following accompanying drawings,
[0008] Fig. 1 illustrates a fuel injector, according to an embodiment of the present invention.
Detailed description of the embodiments:
[0009] 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 (106) and a nozzle (102), wherein the injector body (106) is inserted in a cylinder head (104) in an operative configuration of said fuel injector (10).
[0010] In one embodiment of the invention, the fuel injector (10) is characterized by a sleeve (108) provided along the length of the injector body (106) which is inserted in the cylinder head (104). Additionally, the sleeve (108) is provided with a thro hole (110) for easier removal and insertion of said sleeve (108) at the engine cylinder.
[0011] The sleeve (108) is composed of a material with lower deformity like copper in one embodiment of the invention. The sleeve (108) aids in overcoming the wear caused on the guidance of the injector body (106) by protecting it against component failure in field. This wear is usually the result of interactions or interface takes place between the cylinder head (104) and the injector body (106) which leads to fluctuations in the performance of the fuel injector (10) at a later stage.
[0012] Additionally the sleeve also serves in providing a dampening effect such that even with wear, the fuel injector (10) and its components are safe. This further aids to stop field failure.
[0013] In an embodiment as described herein, since injectors are aligned with cylinder axis, the sleeve also aids in ensuring a lack of functional effects, better atomization and also in meeting required emission norms. Additionally, by avoiding the components wear, the sleeve aids in limiting the fuel high back flow, hence maintains a constant fuel tank temperature.
[0014] The invention as disclosed herein also ensures an increase in the lifespan of fuel injectors by eliminating the failure due to guidance wear. Moreover, the process of adding the sleeve (108) is easy and requires less investment, while reducing major failure like nozzle shaft breakage.
[0015] 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.