FIELD OF INVENTION
The present invention generally relates to an air cooling mechanism for a continuously variable transmission system for a scooter type vehicle.
BACKGROUND OF THE INVENTION
Generally in scooters, cooling of continuous variable transmission system (hereinafter CVT) is mainly done by flowing air. Said air enters the system through an inlet passage provided in the front part of kick start cover and exits through an outlet provided either at rear of crankcase of kick start cover.
In the known art, the said inlet passage is in close proximity to the cooling fins of the engine which heats up the surrounding air and hence hot air enters said inlet passage of kick start cover resulting in improper cooling of CVT system. Further, due to position of inlet passage foreign substances like dust, water or mud enters in said inlet passage and can damage filter layer used in the air inlet passage.
Moreover, outlet provided for this cooling system also plays a very important role and for better cooling outlet passage should have enough space for exit of circulated air out of CVT system. Due to design and strength concerns, it is not feasible to make a large cut out for out let and hence cooling efficiency of said cooling arrangement reduces.
In some cases to overcome such problems multiple outlets are provided either in the kick start cover or in crankcase. After circulation through CVT system, air becomes hot and in case of multiple outlets, hot air again flows

through some parts of CVT system in order to reach all possible outlets. This recirculation of hot air results in heating of those parts of CVT, which reduces cooling effect of the system.
Thus to maintain cooling efficiency and to address above discussed problems a modified and efficient air cooling mechanism is required.
SUMMARY OF THE INVENTION
Main objective of present invention is to provide an air cooling mechanism for a CVT system of a scooter type vehicle. Mentioned air cooling mechanism has an air inlet passage away from cooling cowl of the
i engine. Said air inlet passage is located behind the side panel of the' scooter and in same horizontal plane of the pillion foot rest. Provided air inlet passage has ribbed structure in order to prevent entry of foreign elements such as dust, mud, pebbles etc from atmosphere.
Air outlet is divided between the crankcase and kick starter cover such that crankcase and kick starter cover are forming a single housing space for CVT system when joined together. Specific profile is made at outlet area of the crankcase and kick starter unit such that an upper deflector and a lower deflector are integrally made with crankcase and kick starter cover.
1 Air entering through air inlet passage flows through kick starter cover and crankcase and flows out of CVT housing through the air out let. Air coming towards outlet is deflected outwards by a slant profile of lower

deflector and remaining air at this point further flows upwards and gets deflected back by upper deflector towards the main outlet.
Provided main outlet orients exit air downwards where it is interrupted by atmospheric air flowing backwards due to motion of scooter. To control said interruption, a stopper is provided outside the main exit over the crankcase as well as the kick starter cover to change direction of exit air as well as atmospheric air in same direction.
Summary provided above explains the basic features of the invention and does not limit the scope of the invention. Additional detailed information related to the enablement of the invention will be provided in the detailed description and accompanying claims. Scope of the invention shall be based on the claims provided.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawing(s). Provided drawings are incorporated in and constitute embodiments of the invention and illustrates several aspects of the invention and together with a description of the embodiments serve to explain the principles of the invention. Drawings given below are provided to support the description of the invention and are not limiting the scope of the present invention. A brief description of the drawing is as follows:
Figure 1 is the side view of the scooter type vehicle focusing upon the mounting arrangement of the claimed invention with reference to

difference embodiments of the vehicle. This figure also depicts the enabling details of the invention.
Figure 2 and Figure 3 are showing the arrangement of the inlet passage for claimed cooling system with respect to the engine cooling fins. These figures are also depicting the flow of air through the cooling system for CVT system.
Figure 4, Figure 5 and Figure 6 are showing essential embodiments of the invention in order to describe enablement and assembly details for the same.
DETAILED DESCRIPTION OF THE INVENTION
The embodiments disclosed below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may utilize their teachings. The invention may have application to all kind of vehicles.
Referring to Figure 1, a scooter type vehicle 100 is provided with a more effective cooling mechanism for the CVT system. Mentioned air cooling mechanism has an air inlet passage 3 away from cooling cowl 101a of the engine 101. Said air inlet passage 3 is located behind the side panel 1 of the scooter 100 and in same horizontal plane of the pillion foot rest 2. Air entering 12 from the inlet passage 3 reaches to fan 9 and gets circulated through CVT housing 20 made by crankcase 6 and the kick

starter cover 6. This circulating air 10 cools CVT system and exits from outlet passage 5 provided at the rear end of the CVT housing 20.
Further, as shown in Figure 2 and Figure 3 and Figure 6, provided air inlet passage 3 has ribbed structure 3a in order to prevent entry of foreign elements such as dust, mud, pebbles etc from atmosphere. Air entering 12 into the inlet passage 3 passes through fins 3a. Any foreign element like mud, dust or pebbles etc gets stuck into said fins 3a and does not reach to the filter element of the inlet passage 3.
Referring to Figure 4 and Figure 5, air outlet 5 for flowing air 10 is described. Said air outlet passage 5 is divided between the crankcase 6 (Figure 4) and kick starter cover 4 (Figure 5) such that crankcase 6 and kick starter cover 4 are forming a single housing space 20 for CVT system when joined together. Specific profiles (14, 15 and 17) are made at outlet passage 5 of the crankcase 6 and kick starter cover 4. Crank case 6 and kick starter cover 4 are joined such that said specific profiles (14, 15 and 17) gets fixed with each other and form a main outlet 16.
Mentioned specific profiles (14,15 and 17) define an upper deflector 14 and a lower deflector 15 and a stopper 17 which are integrally made with crankcase 6 and kick starter cover 4 by modifications in crankcase 6 as well as kick starter cover 6.
Again referring back to Figure 4 and Figure 5, enabling mechanism of said air cooling mechanism for CVT system is explained. Air entering 12 through the air inlet passage 3 reaches to fan 9 through fan opening 13

provided in the fan cover 18 of the kick started cover 4. Said fan 9 circulates this air 10 through CVT housing 20 formed by crank case 6 and kick starter cover 4 together.
Said air 10 flows through kick starter cover 4 and crankcase 6 in multiple directions and reaches to all components of CVT system. Multiple deflectors 19 are provided in CVT housing 20 which are facilitating proper circulation of air 10 through CVT system and ensuring better cooling.
After complete circulation through the CVT system, circulated air 10 flows out of the CVT housing 20 through the main air outlet 16 of the outlet passage 5. Air 10 coming towards main outlet 16 is deflected outwards by a slant profile 15a of lower deflector 15 and remaining air at this point further flows upwards (due to centrifugal force of CVT elements inside CVT housing 20) and gets deflected back by upper deflector 14 towards the main outlet 16.
Provided main outlet 16 orients exit air 8 downwards where it is interrupted by atmospheric air flowing backwards due to motion of scooter. To control said interruption a stopper 17 is provided outside the main outlet 16. This stopper 17 is also integrated with the crankcase 6 as well as the kick starter cover 4 to change flow of exit air 8 as well as atmospheric air in same direction.

J

WHAT IS CLAIMED IS
1) An air cooling mechanism for a CVT system of a scooter type vehicle
comprising an air inlet passage located on a kick starter cover and behind
the side panel of the scooter in same horizontal plane of the pillion foot
5 rest; and an air outlet divided between a crankcase and the kick starter cover; wherein, a specific profile is made at the air outlet of the crankcase and kick starter unit such that an upper deflector and a lower deflector are integrated with crankcase and kick starter cover and said deflectors are configured such that lower deflector deflects approaching air towards a 10 primary outlet in outwards direction by a slant profile and further directs remaining air upwards and upper bracket deflect back by upper deflector towards a main outlet configured to orient exit air downwards.
2) The air cooling mechanism, as claimed in claim 1, wherein said inlet
passage has longitudinal ribbed structure with reference to the inlet
15 direction of the flowing air.
3) The air cooling mechanism, as claimed in claim 1, wherein the
crankcase and the kick starter cover are forming a single housing space
for CVT system.
4) The air cooling mechanism, as claimed in claim 1, wherein a stopper is
20 fixed outside the main exit configured to orient direction of exit air and
atmospheric air in same direction.