Claims:We claim:
1. A cylinder head (104), said cylinder head (104) comprising at least one bore (114) for fitting an injector (10) into said at least one bore (114), said injector (10) comprising at least one nozzle (102),
- Characterized in that a soft sleeve (110) located at the operative bottom of said at least one bore (114); where said soft sleeve (110) is provided in a manner such that the soft sleeve (110) surrounds at least a portion of said at least one bore (114).
2. The cylinder head (104) as claimed in claim 1, wherein soft sleeve (110) has an inner diameter same as the outer diameter of the nozzle (102) of the injector (10).
3. The cylinder head (104) as claimed in claim 1, wherein soft sleeve (110) has an outer diameter more than double the outer diameter of the nozzle (102).
, 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] This invention relates to a fuel injector and particularly relates to the 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 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 components and the cylinder head of the injector.
[0003] The nozzle module components are in aligned engagement with the injector body components. In particular, the nozzle body and the injector body have a central axial passages which are coaxial. A nozzle needle is located in the central passage provided in the nozzle body. During construction of the fuel injector the nozzle needle is located in the central passage of the nozzle body in a manner such that covers the spray holes of the fuel injector.
[0004] In the existing scenario the fuel injector is guided in guidance diameter of cylinder head and then mounted using a clamp. During this mounting, any shift in clamping load axis with respect to the central axis will lead to a lateral load on the injector components. This lateral load in turn pushes the tip of the nozzle against the inner surface of nozzle bore of cylinder head leading to breakage of nozzle shaft or shoulder.
[0005] Therefore, there exists a need for a solution to cater to the protection of the nozzle in a fuel 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 with a cylinder head, according to an embodiment of the present invention.
[0008] Fig. 2 illustrates a cylinder head of the fuel injector, zoomed in, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0009] Fig 1 illustrates a fuel injector (10) with a cylinder head (104), according to an embodiment of the present invention. The fuel injector (10) comprises of at least a cylinder head (104), a nozzle (102) and an injector body (112). The nozzle (102) further comprises of a nozzle body (106), a nozzle bore (108) and a nozzle shaft or shoulder.
[0010] In the disclosed invention, the cylinder head (104) is provided with at least one bore (114) for fitting an injector (10) into said at least one bore (114). The bore (114) may be drilled or otherwise configured into the cylinder head (104) at the time of manufacturing of the cylinder head (104). Fig. 2 illustrates a zoomed in representation of the cylinder head (104) of the fuel injector, according to an embodiment of the present invention.
[0011] In the described invention, the bore (114) in the cylinder head (104) is characterized with a soft sleeve (110). This soft sleeve (110) is located at the operative bottom of said bore (114). Moreover, the bottom surface of the cylinder head (104) and the bottom surface of the soft sleeve (110) should be inline. Additionally the soft sleeve (110) is provided in a manner such that the soft sleeve (110) surrounds at least a portion of said at least one bore (114). This means there is a portion of the soft sleeve that covers a portion of the nozzle bore (108) of the fuel injector (10).
[0012] Although the dimensions of the soft sleeve (110) may vary based on the type of injector used by a particular engine/ vehicle, the soft sleeve (110) ideally should cover at least a third of the height of the nozzle bore (108). Moreover, it is to be taken into consideration that the soft sleeve (110) should maintain an inner diameter same as the outer diameter of the nozzle (102) of the injector (10). Similarly, the soft sleeve (110) should have an outer diameter more than at least double the outer diameter of the nozzle (102). For instance, if the outer diameter of the nozzle (102) is 7 units, then the outer diameter of the soft sleeve (110) should be at least 15 to 20 units.
[0013] The soft sleeve (110) as described in the invention should be made of a softer material like copper, bronze and so on. The main purpose of said soft sleeve (110) being introduced in the bore (114) of the cylinder head (104) is to reduce the lateral load induced upon the nozzle shaft/sleeve of the nozzle (102) of the fuel injector (10). The lateral load may arise while the fuel injector body (112) is guided in to the guidance diameter of cylinder head (104) and mounted using a clamp. During this mounting, any shift in clamping load axis with respect to injector axis is what leads to the lateral load on injector components. This lateral load, if induced on the injector components, will push the nozzle tip against the inner surface of nozzle bore (108) of cylinder head (104) and may lead to breakage of the nozzle shaft/shoulder. This is a common occurrence in the prior arts as disclosed in the background, which in turn reduces reduction in performance of the fuel injectors and other related problems ensuing the breakage.
[0014] As per the proposed invention, introduction of a soft sleeve (110) made of a heat resistant soft material can aid in reduction of the lateral load. The soft sleeve (110) will offer less resistance for nozzle (102) when the lateral load is induced from the clamping. The material of the soft sleeve (110) enables the soft sleeve (110) to deform when the lateral load is being applied on the nozzle (102) when in contact with cylinder bore (114) thereby avoiding the breakage of the nozzle shaft / shoulder.
[0015] The disclosed invention further improves the performance of the fuel injector and thereby of the engine itself and in turn the vehicle in a plurality of ways. The main advantage of said invention is that it enhances product safety and helps in overcoming consequential engine damage observed in prior arts.
[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.