FIELD OF INVENTION
[0001] The present invention relates to a cooling mechanism for an engine and
more particularly to a cooling mechanism for spark plug seat on an internal combustion en'gine.
BACKGROUND OF INVENTION
[0002] In general, while combustion inside an internal combustion engine, a large
amount of heat is produced due to which the cylinder head and cylinder block of the internal combustion engine attains a very, high temperature and becomes very hot. There . are known ways and prior arts in which the cylinder blocks and cylinder head cooling is performed by the utilization of the.wind flow and focusing the air on the cylinder head and cylinder block through a shroud.
[0003] Some prior arts use the cooling mechanism & perform improving cooling
performance of the engine by forcing the wind on to engine in Step through. Cooling of the engine through forcing the wind on to engine by any attachment overhanging on the Engine.
[0004] Due to continuous combustion of fuel inside the internal, combustion
engine, the cylinder head becomes hot and above that since a spark plug generates sparks for firing of the combustible fuel and operates by a high voltage, the spark plug becomes very hot and it is required to provide an exclusive cooling mechanism for dissipating the heat produced.

SUMMARY OF THE INVENTION
[0005] The current invention relates to achieving spark seat cooling by using a
duct integrated with the fuel tank. The current invention uses the space between the fuel tank lower body to fix a duct, the duct being elongated towards the cylinder head and pointed to the spark seat. The current invention places the duct from top of the spark plug seat and perpendicular to it in such a way that the air entering the duct cools the spark plug seat and the hot air thus created is expelled in a direction rearward to the vehicle.
[0006] * When vehicle is running, the air enters the cooling and gets rammed into
the spark plug seat-and thereby-pooling the spark plug and the spark plug-seat. The^ cooling duct has a bigger opening end and a smaller exit end due to which the air entering . inside the cooling duct at one end following a path, the air when exits the cooling duct from the other end,, the air which is getting expelled from the cooling duct will have a higher flow rate as compared to the air entering end.
[0007] A higher flow rate of air at entry end will provide a better convection and
cooling effect for the spark seat plug due to higher rate of airflow. Also since air at lower temperature entering through the inlet, exits the cooling duct from the end, it cools the spark plug seat if this air is made to ram or strike it. The focusing of air and providing a conduit for its passage to hit on a hot surface is the basic concept on which this invention works thus thereby cooling the relatively hotter spark plug seat.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 illustrates a typical two-wheeler.

Figure 2 illustrates duct location and it's orientation in a two-wheeler. Figure 3 illustrates the spark plug seat cooling by the proposed duct. Figure 4 illustrates the spark plug seat-cooling duct integrated with the fuel tank. DETAILED DESCRIPTION OF THE INVENTION
[0008] The current invention discloses a wind deflector of tubular structure with
high performance of deflecting the airflow on to engine and more specifically to the spark plug seat for cooling the spark plug and spark plug seat and the surrounding area. In the current invention, a detachable_deflector or air duct is mounted on the.fuel tank.
[0009] For the detachable deflector or air duct, ratio of the length of the straight
portion has to be twice the size of the diameter of tubular structure for effectively focusing the stream of air on to spark seat. The deflector as disclosed in the current invention is of completely tubular structure, which focuses the air on to the spark seat to reduce the temperature. The described deflector can be attached on the fuel tank on the side of the vehicle equipped with the spark plug seat.
[00010] Figurel shows a typical two-wheeler 10, with a vertical engine. The
vehicle comprises of a rider seat 1, an exhaust muffler 2, a rear wheel 3, a centre stand 4, an engine 5, and a front wheel 6, a fuel tank 7 and a spark plug 8 on the engine 5.
[00011] Figure 2 shows the location of the cooling duct 21 attached to the fuel tank
13. The cooling duct is located in between the gap below the fuel tank and its profile is such that the cooling duct has its front opening wide open towards the front so that a large

amount of air can be routed through the cooling duct. The cooling duct profile diverts this fresh atmospheric air and expels on to the spark plug seat.
[00012] Figure 3 illustrates the spark seat cooling through the proposed duct. As it
is clear from the drawing, the cooling duct.has its frontal opening open towards the front
* *
of the vehicle and the routed air is directed on to the spark plug seat. Figure 3 shows the fuel tank 13, spark plug seat 12 and the cooling duct 21.
[00013] Figure 4 shows the cooling duct 21 attached to the fuel tank 13. The fuel
tank (7) as seen from the bottom side when assembled has a bottom depression (44) which-sitsand JS'therefore -supported on the vehicle frame main tube;-The-patii-for.airflow....—•...-has been marked with an arrow 42 and dashed line. The cold atmospheric air enters from the cooling duct 21 through the opening 42, follows the dashed path line, and comes out of the cooling duct from the opening 43. The opening 43 as shown in Figure 2 and Figure 3 faces the spark plug seat. The depression (44) is a portion of the front contour (46) of the said fuel tank (7).
[00014] When vehicle is running, the air enters the cooling duct 21 and gets
rammed into the spark plug seat 8 (Figure 1) and thereby cooling the spark plug and the spark plug seat. The cooling duct 21 has a bigger opening end and a smaller exit end due to which the air entering inside the cooling duct 21 at the end 42 following the dashed path, the air when exits the cooling duct from the end 43, the air which is getting expelled from the cooling duct 21 will have a higher flow rate as compared to the air entering at the end 42.

[00015] A higher flow rate of air at end 43 will provide a better convection and
cooling effect for the spark seat plug due to higher rate of airflow. Also since air at lower temperature enters through the end 42, exits the cooling duct from the end 43, it cools the spark plug seat if this air is made to ram or strike it. The focusing of air and providing a conduit for its passage.to hit on a hot surface is the basic concept on which this invention works thus thereby cooling the relatively hotter spark plug seat.

We claim:
1. A system for cooling cylinder head of an internal combustion engine comprising:
a spark plug (8) mounted on a spark plug seat (12) which in turn is mounted on said cylinder head of the internal combustion engine (5);
a fuel tank (7), wherein the fuel tank being mounted on a vehicle frame;
a cooling duct (21) providing passage for atmospheric air;
characterized in that:
' the said cooling duct "(21)'is attached InTroht portion (F)" of the'bottom depression (44) of the said fuel tank (7) and extends in longitudinal and rearwardly downward direction until the said spark plug seat (12).
2. The apparatus for cooling cylinder head of an internal combustion engine of Claim 1 wherein the said cooling duct (21) is attached to the said fuel tank (7) facing front of the vehicle so that maximum possible air can pass through the said cooling duct (21).
3. The apparatus of Claim 1 wherein the said cooling duct (21) is attached on front edge portion (46) of the said fuel tank (7).