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 to a cylinder head for an internal combustion engine.

Background of the invention
[0002] Internal combustion engines are widely used in transportation and other industrial sectors. The engines convert the chemical energy stored in fossil fuels into useful mechanical energy. The energy conversion is made possible by controlled combustion of the fuels in engine cylinders.
[0003] The combustion within the engine cylinder occurs at high temperatures and pressure. The high pressure of the combustion gases always presents the possibility of the gases leaking and escaping through the openings in the engine cylinder block. Sealing by various means have been conventionally used to prevent such combustion gas leakage. However, these seals have not been able to eliminate the escape of combustion gases.
[0004] The combustion gases often escape through the imperfections on the contact surface between the sealing material and the engine cylinder.
[0005] Efforts have been made in the related prior art to provide different solutions for preventing the leakage and escape of combustion gases in internal combustion engines. For example, a US patent no. US 8813727 B2 provides a sealing assembly for a pressurized fuel feed system for an internal combustion engine. The seal assembly comprises providing a fuel conduit having a fluid flow passage therethrough for conveyance of a pressurized fuel-containing gas in a general fluid-flow direction with a first sealing surface disposed on the fuel conduit. A second sealing surface engages with the first sealing surface, such as to provide a fluid-tight connection preventing pressurized gas from leaving the fluid flow passage. The said first and second sealing surfaces are substantially perpendicular to the general fluid-flow direction. An o-ring is disposed between the first sealing surface and second sealing surface, the o-ring being compressed by the first and second sealing surfaces to form said fluid-tight connection. Preferably the o-ring is subjected to a squeeze of at least 40%, more preferably 50%, when the first and second sealing surfaces are coupled together. However, the invention in the prior art will not be able to prevent the escape of the combustion gases through the imperfections in the contact surface between the sealing surfaces.
[0006] Therefore, the present disclosure overcomes the above-mentioned problem associated with the traditionally available method or system.

Brief description of the accompanying drawing
[0007] An embodiment of the disclosure is described with reference to the following accompanying drawings:
[0008] Fig. 1 illustrates a cross-sectional view of cylinder head, fuel injector and piston arrangement; and
[0009] Fig. 2 illustrates an enlarged cross-sectional view of the sealing washer seating surface, sealing washer and fuel injector arrangement.

Detailed description of the embodiments
[0010] In an embodiment of the present disclosure, Fig. 1 illustrates a cross-sectional view of cylinder head (103), fuel injector and piston arrangement and Fig. 2 illustrates an exemplary enlarged cross-sectional view of the sealing washer seating surface, sealing washer and fuel injector arrangement.
[0011] In an embodiment of the present disclosure, the invention involves a cylinder head for an internal combustion engine comprising a fuel injector bore (101) and a sealing washer seating surface (106) at the lower end of the fuel injector bore (101), characterized in that the sealing washer seating surface (106) is having a conical profile rising, form the lower end of the fuel injector bore (101), towards a point on the axis of the fuel injector bore (107).
[0012] In an aspect of the invention the cylinder head is having a fuel injector (105) mounted in the fuel injector bore (101), such that a sealing washer (102) on the fuel injector (105) and the sealing washer seating surface (106) forms a line contact.
[0013] The fuel injector bore (101) is a cavity made on the cylinder head for accommodating the fuel injector (105). The fuel injector bore (101) is usually made with a constant diameter sufficient to accommodate the fuel injector and with an appropriate depth. From the lower end of the fuel injector bore (101) the cavity continues downwards into the engine cylinder with a lesser diameter sufficient to accommodate the nozzle of the fuel injector (105).
[0014] The sealing washer seating surface (106) is the lower end of a fuel injector bore (101) on the cylinder head (103). The sealing washer seating surface (106) according to the present invention is provided with a profile which conically rises, form the lower end of the fuel injector bore (101), towards a point on the axis of the fuel injector bore (107).
[0015] The profile is provided to the sealing washer seating surface (106) so that a line contact is formed between the sealing washer (102) and the sealing washer seating surface (106) instead of the conventional surface contact. A line contact necessarily means the contact between the sealing washer (102) and the sealing washer seating surface (106) can be traced in the form of a line. The line is a two-dimensional form with negligible area.
[0016] A line contact is preferrable to a surface contact for providing a better seal. In surface contact there will be minute surface imperfections on the contact surfaces which aid the escape of combustion gases resulting in an imperfect seal. In a line contact the sealing washer seating surface (106) pushes into the sealing washer (102) to provide a better seal.
[0017] The angle between the sealing washer seating surface (106) and a plane perpendicular to a plane of the axis of the fuel injector bore (107) can be any acute angle and is best implemented in the range of 10-30.
[0018] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
, Claims:We Claim:
1. A cylinder head for an internal combustion engine comprising:
- a fuel injector bore (101);
- a sealing washer seating surface (106) at the lower end of the fuel injector bore (101);
characterized in that:
- the sealing washer seating surface (106) is having a conical profile rising, form the lower end of the fuel injector bore (101), towards a point on the axis of the fuel injector bore (107).

2. The cylinder head as claimed in claim 1 having a fuel injector (105) mounted in the fuel injector bore (101), such that a sealing washer (102) on the fuel injector (105) and the sealing washer seating surface (106) forms a line contact.