FIELD OF INVENTION
[0001] The present invention relates to a cooling system for an engine and more
particularly to a radiator in a CVT type engine.
BACKGROUND OF INVENTION
[0002] In general, an automobile engine performs combustion of fuel inside the
cylinder thus thereby powering the transmission system connected to the engine along with production of a large amount of heat energy. This heat energy is mainly concentrated near to the cylinder block and cylinder head of the internal combustion engine. It is necessary to maintain the engine temperature at an optimum level to improve the combustion process.
[0003] The heat generated in the cylinder block and transmitted to the cylinder
head can be removed by using liquid cooling system. In this system, a coolant is made to circulate from cylinder-block and cylinder head, thus extraction of heat from the cylinder block and cylinder head is performed. Such a cooling system for extraction of produced heat in an internal combustion is already known. In a two-wheeler, placing, locating and . orientation of radiator becomes a great challenge due to space constraints. Moreover, since rider is required to place his leg on the sides of engine in such a vehicle, the venting of hot air generated due to cooling fan for radiator becomes very difficult. Hence, there is a requirement for locating and orienting a radiator efficiently in a two-wheeled vehicle so as the hot air exit from the radiator does not hit the rider's legs.

SUMMARY OF THE INVENTION
[0004] Hence, to obviate the limitations associated with the existing design, the
current invention proposes location and orientation of a radiator in a liquid-cooled engine - such that the hot air is guided so as not to obstruct the rider's legs. The current invention further relates to installation of radiator in a two-wheeled vehicle, which provides a more efficient cooling, and hot air exit from the engine cooling system. In the present invention, the two-wheeler engine has radiator oh the engine right hand (RH) side. A radiator cover covers the radiator. This radiator cover protects the radiator from harmful external agents like stones and protects the user from the hot surface of the radiator. The above-mentioned radiator cover is designed in such a way that the cover gradually protrudes away from the radiator from front to the rear direction of the vehicle. In other words, the rear thickness of the radiator cover is more than the front thickness. This aids by partially blocking the airflow and accumulating air in front of the radiator for sucking
in by a fan for cooling.
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[0005] The above described radiator cover also has mounting points for the
radiator that are offset vertically i.e. the two complementary mounting points are not at the same level. The radiator cover has a curve design on the front side for aesthetic purposes. The radiator is placed in engine RH between cowl & cover radiator. The ambient air is sucked to the radiator by the fan axil suction & the air exits through a vent made in the cover air outlet. The centrifugal fan is driven by the rotation of the crankshaft. The fan shroud is made of aluminium alloy & mounted to crankcase right

hand side (RH). Three or four mounting bolts assemble the radiator & cover radiator to the shroud made of aluminium alloy.
BRIEF DESCRIPTION OF DRAWINGS
Figure lillustrates a typical type two-wheeler with a CVT type engine.
Figure 2 illustrates perspective view of a typical CVT type engine of a two-wheeler.
Figure 3 illustrates a cut section view of a typical CVT type engine.
Figure 4 illustrates exploded view of cooling system assembly for a typical CVT type engine.
Figure 5 illustrates three points mounting of radiator on a'typical CVT type engine. "
Figure 6 illustrates four points mounting of radiator on a typical CVT type engine.
DETAILED DESCRIPTION OF THE INVENTION
[0006] The cooling system as disclosed in the current invention comprises of
radiator mounting; radiator cover and its mounting, radiator cover profile, fan cover, and hot air vent through the fan cover as main elements. The current invention proposes a better and more efficient way of installing the radiator for a CVT type engine wherein the intake of fresh air for radiator cooling and exit of hot air through the integrated fan cover is described. The radiator & cover radiator is mounted together one above the other using four or three fasteners. The radiator, cover radiator are together assembled to fan cover. The fan cover is assembled to crankcase RH using four bolts. The radiator cap is protected against opening by an extension from cover for air ventilation. The cover air

but has a mesh to avoid any solid particles going into the cowl. The cover air outlet is attached to cowl.
[0007] Figure 1 shows a typical two-wheeled vehicle 1 with a rear wheel 2,
engine 3, air filter 4, front wheel 5, floorboard 6, utility box 7, side panel 9, front shock absorber 10, rear shock absorber 11, grab rail 12, tail lamp 13 and rider seat 14. The direction of arrow "F" shows the front direction of the vehicle and direction of arrow "R" shows the rear direction of the vehicle. The engine 3 as disclosed in Figure 1 produces heat energy after combustion of fuel inside it. The fuel gets burnt inside the cylinder block and hence, the area near to cylinder block and the cylinder head get extensively heated up. The cylinder block and cylinder head area hence requires a supplementary cooling system to extract the heat thus generated.
[0008] Figure 2 shows the perspective view of the engine. The front direction "F"
and the rear direction "R" have been clearly marked. The direction of the engine layout is very important because it provides information about the direction of airflow across the engine cylinder head and engine cylinder block when the vehicle is in motion. As it can be seen from the Figure 1, the radiator can be easily mounted in the lateral direction of the engine, which restricts the amount and quality of fresh air that can be induced inside by the fan through the radiator for its cooling. The fresh air entering the radiator through the radiator cover 22 passes through the radiator and exits through the vent outlet 24. The vent outlet 24 is located and directed in such a way that the hot air is thrown in the rearward direction of the vehicle. When the engine 3 is integrated with the vehicle 1, this hot air vent outlet 22 expels the hot air without interfering with the rider legs. This is very

much desirable as expelled hot air colliding with the rider's leg can give a bad driving experience.
[0009] Figure 3 shows the cut section view of engine 3. Figure 3 shows the
cylinder head 21, coolant pump P, cylinder bore 31, connecting rod 32, face fixed drive pulley 33, cover fan CVT 34, kick starter 35, crankshaft 36, CVT belt 37, clutch shaft 38, CVT driven assembly 39, fan radiator 40, radiator 41 and hose outlet 42 for the radiator. The radiator fan 40 is an axil type fan, which inducts air inside. The fuel combustion takes place inside the cylinder bore 31. The upward and downward motion of connecting rod 32 rotates the crankshaft 36. The rotation of crankshaft 36 is synchronous with the motion of the connecting rod 32. The pump P that is a mechanical pump also pumps the coolant based on the speed of rotation of the crankshaft 36. On the other end of the crankshaft, the radiator fan 40 and the radiator, 41 are mounted in such a way that the outside air is drawn with the help of fan 40 thus thereby cooling the radiator 41. The coolant travels outside the radiator 41 through the hose outlet 42 and enters the pump P after which the coolant travels to the cylinder head 21 and cylinder block and finally sent back to the radiator. While travelling back to the radiator 41 after traversing through the cylinder head and cylinder block, the coolant exchange heat energy and thus becomes hot. The hot coolant passes through the radiator ducts on one side of which is atmospheric air and the other side is mounted the axil fan. Axil fan 40 inducts the air inside through the radiator 41, thus thereby cooling the already hot radiator duct, which in turn cools the radiator coolant.

[00010] Figure 4 shows the exploded view of the radiator assembly, which clearly
shows the flow of air inside the cooling system and outside the system. Figure 4 shows
the cylinder head 21, radiator cover 22, wheel shaft 23, and cowl mounting point 1, cowl
mounting point 2, radiator 41, air outlet 47, fan cover 48, radiator cap cover 49 and the
cover air outlet 24. "F" shows the front direction of the wheel; "R" shows rear direction.
The radiator cover 22, radiator 41 and the fan cover 48 are mounted at the points 45 and
46 by means of fastening elements. The air outlet 47 is an integral part of the fan cover
48. Moreover, the cover air outlet 24 and radiator cap cover 49 are integrated parts. In the
unexploded view, the cover air outlet 24 slides in the air outlet 47 and the radiator 41's
cap slides into the radiator cap 49. ...........
[00011] The hot air introduced inside the fan cover 48 through the fan 40 exits the
fan cover through the air outlet 47. The radiator cover 22 as shown in the figure 4 has circular protrusions on the face facing the outer atmosphere, that function as to trap fresh air, which is eventually inducted inside by the axil fan 40. The cover air outlet 24 has grills so that to avoid any foreign material like stones or mud are stopped from entering into the fan cover 48. Since fan, cover 48 covers fan, this has rotating parts, a cover air outlet 24 acts as a guard to the fan cover 48.
[00012] Figure 5 shows the three points mounting of the radiator 41 on the engine 3. Figure 5 shows right side view of engine 3. As seen from the right side of the vehicle, wheel shaft 23, first cowl mounting point 45, second cowl mounting point 46, radiator cap 49, radiator 41, third cowl mounting point 51, and radiator hose 52 are shown.

[00013] Figure 6 discloses another embodiment for radiator 41 mounting on the
engine 3. Figure 6 shows cylinder head Irradiator 41,wheel shaft 23, first cowl mounting point 45, second cowl mounting point 46, third cowl mounting point, 51, fourth cowl mounting point 61 and air filter 4. Depending upon the engine layout, orientation and requirement, either of the above-described three point or four point mountings for the radiator may be used.

We claim:
1. A cooling system for a two wheeler engine (3); the said engine (3) comprising:
a fan (40) wherein the said fan (40) is mounted on a crankshaft (36) of the said engine (3), the said fan being covered with a fan cover (48);
a radiator (41)wherein the said radiator (41) is mounted on the said fan cover (48) by fastening means and the radiator (41) has a cap cover (49);
a radiator cover (22) wherein the said radiator (41) being sandwiched between the said fan cover (48) and the said radiator cover (40);
wherein the said fan cover (48) is provided an air outlet (47) in such a way that the said outlet (47) directs the hot air induced by the fan (40) through the radiator (41) in vehicle rearwardly direction (R).
2. The cooling system for a two-wheeler engine (3) as claimed in Claim 1 wherein the said radiator cover (22) is equipped with circular rings (44) for trapping air and diverting towards the radiator.
3. The cooling system for a two-wheeler engine (3) as claimed in Claim 1 wherein the said radiator cover (22) is equipped with plurality of grills (53) for stopping any foreign materials from entering the fan cover outlet.
4. The cooling system for a two-wheeler engine (3) as claimed in Claim 1 or Claim 4 wherein the said grills for fan cover (24) is integrated with the said cap cover fan cover (49) for radiator (41).