DESC:TECHNICAL FIELD
[0001] The present invention relates generally to a two wheeled vehicle. More particularly, the present invention relates to a cooling system employed to cool a continuously variable transmission system in an internal combustion engine of the two wheeled vehicle.

BACKGROUND
[0002] A continuously variable transmission system (CVT system) is usually adopted in the internal combustion engine (IC engines) wherein mechanically shifting gears by a rider of a two wheeled vehicle can be avoided. The CVT system replaces the gear shift transmission mechanism in the IC engine. Generally, IC engine of all two wheeled vehicles have a transmission system between a crankshaft and the final drive to a wheel of the two wheeled vehicle to change the ratio between the crankshaft rotational speed and the rotational speed of the wheel to provide speed and torque conversions of the two wheeled vehicle. While regular geared transmission system requires that the rider of the two wheeled vehicle manually perform gearshifts, CVT system eliminates this need of performing manual gearshifts by providing automatic change in gear ratios between the crankshaft rotational speed and the rotational speed of the wheel. CVT system in fact, provides almost infinite gear ratios which make driving very easy, smooth and efficient. The CVT system comprises a front pulley operably attached to the crankshaft, a rear pulley operably connected to the wheel and a belt rests between them. The front pulley comprises a variator mechanism and the rear pulley comprises a centrifugal clutch. Different gear ratios are obtained by change the effective diameter of the front pulley and the rear pulley while the belt is sitting on them and moving. Since, the CVT system involves the belt and pulley system, the centrifugal clutch and many moving parts it is essential to provide a forced air cooling system to cool and CVT system and extracts heat. This improves the efficiency of the CVT system and increases the operating life of the associated components. Typically, forced air cooling systems comprise a fan which is operably connected to the front pulley, and the fan forces air flow through an intake passage surrounding the internal combustion engine. The position and functioning of the intake passage is very essential in designing a forced air cooling system for the CVT system as there is potential for entry of water, mud and debris inside which can damage the CVT system and its associated components. Thus to prevent entry of water, mud and debris inside the CVT system and thus improving IC engine performance and to address above discussed problems, the present subject matter proposes a new intake passage for the forced air cooling system.

BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The detailed description is described with reference to the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0004] Fig. 1. illustrates the side view of a two wheeled vehicle employing an embodiment of the present subject matter.
[0005] Fig. 2. illustrates an enlarged side view of an internal combustion engine with an air intake structure according to the embodiment of the present subject matter.
[0006] Fig. 3a. illustrates the air intake structure according to the embodiment of the present subject matter.
[0007] Fig. 3b. illustrates a sectional view (Y-Y) of the air intake structure according to the embodiment of the present subject matter.
[0008] Fig. 4a. illustrates the air flow circulation in the air intake structure directing the air to a CVT cover according to the embodiment of the present subject matter.
[0009] Fig. 4b. illustrates a side view of the internal combustion engine within the CVT cover according to the embodiment of the present subject matter.
[00010] Fig. 5 illustrates a cover wall enclosing a hot air exit according to the embodiment of the present subject matter.

DETAILED DESCRIPTION
[00011] Various features and embodiments of the present invention here will be discernible from the following further description thereof, set out hereunder. According to an embodiment, the internal combustion engine described here operates in four cycles. Such an internal combustion engine (IC engine) is installed in a step through type two wheeled vehicle. It is pertinent to note that the internal combustion engine may be mounted in two wheeled vehicles in different arrangements such as in transverse and longitudinal fashion. However, in the ensuing description, such engine is transversely mounted at a lower portion of the step through type two wheeled vehicle. It is contemplated that the concepts of the present invention may be applied to other types of vehicles and other types of internal combustion engine such as that of the two-stroke type within the spirit and scope of this invention. Further "front" and "rear", and "left" and "right" referred to in the ensuing description of the illustrated embodiment refer to front and rear, and left and right directions as seen from a rear portion of the internal combustion engine and looking forward. The detailed explanation of the constitution of parts other than the present invention which constitutes an essential part has been omitted at suitable places.
[00012] Typically, in a two wheeled vehicle such as a scooter, a swinging internal combustion engine is located below the seat at a lower rear portion of the two wheeled vehicle. The internal combustion engine (IC engine) is swingably supported by rear suspension system and attached to the frame of the two wheeled vehicle. A CVT system forms a part of the IC engine is disposed on the rear portion of the IC engine and mounted so as to be disposed on right or left of the two wheeled vehicle. In one embodiment, the CVT system is disposed so as to be oriented towards the left of the two wheeled vehicle as viewed from the rear direction of the two wheeled vehicle. The CVT system is enclosed within the LH crankcase of the IC engine on the rear side of the IC engine and the CVT system is enclosed by a CVT cover, thus forming an enclosed space within the CVT cover.
[00013] The CVT system comprises a front pulley operably attached to a crankshaft (via gear-train), a rear pulley operably connected to the rear wheel (again via another set of gear-train) and a belt rests between them. The front pulley and rear pulley each is made up of two sliding halves with an elastic member applying a positive bias force restricting movement of each of the halves of the pulleys. The belt having a fixed length is set between the two halves of the front pulley and the rear pulley.
[00014] One of the half of the front pulley which is configured to slide comprises a variator mechanism attached to it. The variator mechanism comprises a plurality of rollers disposed radially in an empty cage which are provided with ramps around a disc. At rest condition, the halves of the front pulley are held open by the elastic member and the halves of the rear pulley are held closed by the rear elastic member. This condition gives a large gear ratio required for providing starting torque to the two wheeled vehicle. During operation, the drive from the crankshaft is operably connected to the variator mechanism such that, the rollers react to the centrifugal force of rotation and climb along the ramp, and this forces the front pulley to overcome the force of the elastic member and cause the two halves of the front pulley to come closer. The belt set between the front pulley and rear pulley has a fixed length, so when the front pulley closes, the belt forces the rear pulley apart and thus changes the gear ratio. Hence, by variation of the throttle by the rider, the speed of the crankshaft varies and the centrifugal forces of the rollers are varied, which allows the rollers to go outward or fall-back. This action is continuous and gives almost infinite gear ratio variations to control the torque output and speed output of the vehicle.
[00015] The rear pulley is operably connected to the wheel through a centrifugal clutch. While the sliding half of the rear pulley is connected to the rear elastic member, the centrifugal clutch is connected to the fixed half, and the transfer of the drive to the rear wheel occurs only when the two wheeled vehicle is not idling. The function of the centrifugal clutch is to allow the IC engine to idle by isolating the rear wheel from the CVT system. It comprises a clutch shoe held by a clutch spring and enclosed in a clutch hub. While the clutch shoe is connected to rear pulley, the clutch hub is connected to the rear wheel. As the speed of IC engine increases above idling speed, centrifugal force causes the clutch shoe to expand and overcome the clutch spring, and comes in contact with the clutch hub. Due to presence of frictional material on the clutch shoe, it begins to drive the clutch hub and the drive is transferred to the rear wheel.
[00016] During working of the CVT system, heat is generated inside CVT system due to friction between the pulleys and the belt. There is always some torque loss is from belt bending and unbending, sliding in and sliding out, and belt compression. In ineffective cooling systems, there can be torque loss upto 50% which invariably gets converted into lot of heat. There is also some amount of heat generated due to centrifugal clutch wherein, the clutch shoe may slip on the clutch housing during acceleration and deceleration. This heat generated will affect the durability and life of all the components part of the CVT system such as front pulley, rear pulley, belt and centrifugal clutch. Excessive heat generation can also damage the belt, the centrifugal clutch and deteriorate their performance. Hence, generally a forced air cooling system is used to circulate air around the CVT system and extract heat from all the systems.
[00017] The forced air cooling system for cooling the CVT system is achieved by using a cooling fan inside CVT crankcase. The cooling fan works on the principle of centrifugal action which forces the air over the belt, front and rear pulleys and the centrifugal clutch. Generally, the rotation of the cooling fan is integrated to the rotation of the crankshaft by connecting it to the front pulley of the CVT system. A CVT cover being a part of the crankcase of the IC engine covers the entire CVT mechanism and the atmospheric air is drawn from an air intake located on the CVT cover. Hence, the heat generated due to movement of various CVT components are exposed to the circulating air and the heat will be dissipated to it. The CVT cover will also have an air outlet for hot air exit located exactly opposite to the air intake.
[00018] The location of the air intake on the CVT cover is a very important criterion as it leads to determining the effective performance and efficiency of the forced air cooling system. The location of the CVT system and the CVT cover as seen from the side view of the two wheeled vehicle with a step-through structure, it is observed that, the air intake is disposed very close to the IC engine main body crankcase. As it is known that one of the major heat sources in the two wheeled vehicle is the IC engine. Hence, the air around the IC engine main body crankcase is always at an elevated temperature. The positioning of the air intake close to the IC engine main body crankcase facilitates the drawing of this hot air into the CVT system by the cooling fan to cool the CVT components. The cooling effect will be rendered ineffective as hot air is used to cool the CVT components. Further, the air intake opens into the atmosphere enabling direct access of air entry inside the CVT system. This can allow entry of foreign matter into the CVT system. The foreign matter can include water, mud, and other debris which can cause the belt to slip and wear out faster. Further, the air intake comprises an air filter foam disposed slightly downstream of the air intake passage which filters the air. But, entry of water, mud and large particles can damage this air filter foam which results in frequent replacement and damage to CVT components. Since, the air intake is located at a point on the two wheeled vehicle very close to the ground level, on movement of the two wheeled vehicle over a puddle of water or through areas having lot of mud the probability of entering the air intake is higher.
[00019] Conventionally, to address this problem of locating air intake on the CVT cover various solutions are known in art. In one solution, the air intake is attached to the frame assembly of the two wheeled vehicle, the frame assembly configured to provide a fluid flow passage and thereby to facilitate supply of air to an air intake attached to the frame assembly. Hence, the air flow is directed from within the frame assembly to the air intake structure. This solution solves the problem of prevention of entry of foreign matter and also prevents the entry of hot air circulating around the hotter regions of the IC engine, but it has a fundamental drawback. The hollow frame assembly develops a layer of rust due to aging of the inner surface of the hollow frame assembly, and hence there is a high probability of the rust dust entering the air intake structure during drawing of air through the frame assembly. This rust dust can damage the air foam filter and also damage the CVT components. Further, another solution proposes to draw air, said inlet of the air disposed in a maintenance lid located on a lower backside of the step-through space of the two wheeled vehicle, said inlet of air is connected to the air intake structure through a connecting pipe. This suffers from the drawback that, additional components such as connecting pipe is used. Further, the connecting pipe is disposed in a location close to the hotter regions of the IC engine and during prolonged operation can get heated up and hence heating the air as it passes through the connecting pipe. This will reduce the efficiency of the forced air cooling system.
[00020] The present invention aims to address the above drawbacks and other related drawbacks by providing an air intake structure to permit drawing of air into the CVT cover to cool the CVT system. The air intake structure is mounted to a side tube extending rearward from the step through structure of the frame assembly. The air intake is mounted as a point to a higher level, above the substantially centre part of the IC engine. This ensures the air intake is located as a distance away from the hotter zones of the IC engine. The frame assembly only supports the air intake and does not permit air to flow through the frame assembly. The air intake comprises a cover member secured by fasteners to the side tube to prevent entry of foreign substances. The cover member envelopes an inlet member welded to the side tube, the inlet member comprising uniform holes distributed throughout to prevent further entry of water and mud inside. A connecting means is attached to the inlet member which connects the inlet member to an inlet aperture on the CVT cover. A part of the connecting means is made up of a bellow portion which is used to protect the connecting means from foreign particles (particularly sharp objects and stones), impacts and other external elements. It also serves to prevent any leak of air as it is drawn in to the inlet aperture. The bellow portion is also made flexible to extend axially to mount the connecting means effectively onto the intake aperture and the inlet member.
[00021] With the above proposed invention, the following advantages can be obtained such as preventing entry of hot air surrounding hotter regions of the IC engine, preventing entry of foreign matter, prevents the entry of rust due to frame assembly, it has compact structure, no change in capacity of cooling fan, improved cooling efficiency of the CVT system and improvement of overall operation of the two wheeled vehicle
[00022] The present invention along with all the accompanying embodiments and their other advantages would be described in greater detail in conjunction with the figures in the following paragraphs.
[00023] Fig. 1 illustrates the two wheeled vehicle (100) in accordance with one embodiment of the present invention. In an embodiment, a two wheeled vehicle (100) comprises of a frame assembly (105) which is conventionally an underbone chassis frame which provides a generally open central area to permit “step-through” mounting by a rider. Typically, the frame assembly (105) comprises of a head tube (102), a main tube (107), and a pair of side tubes (109) (only one shown). The two wheeled vehicle extends from a front portion (F) to a rear portion (R) in a longitudinal axis. The head tube (102) is disposed towards the front portion (F). The main tube (107) extends downwardly and rearwardly from the head tube (102) forming a flat horizontal step-through portion (117). The other end of the main tube (107) is connected with the pair of side-tubes (109) through a bracket (not shown). The head tube (102) is configured to rotatably support a steering tube (104) and further connected to the front suspension system (121) at the lower end. A handlebar support member (not shown) is connected to an upper end of the steering tube (102) and supports a handlebar assembly (106). Two telescopic front suspension system (121) (only one is shown) is attached to a bracket (not shown) on the lower part of the steering tube (104) on which is supported the front wheel (119). The upper portion of the front wheel (119) is covered by a front fender (103) mounted to the lower portion of the steering shaft (104). Also, a rear fender (110) is mounted in the rear part of the two wheeled vehicle (100) to cover the front wheel (113). The pair of side-tubes (109) extends from the other end of the main tube and are disposed parallel on either side of the vehicle width direction. Each of the side tube (109) includes a down frame section (109a) inclined and extending from the main tube (109) and gradually after a certain length extending rearward in a substantially horizontal direction to the rear of the vehicle. A plurality of cross pipes (not shown) is secured in between the pair of side-tubes (109) at selected intervals to support vehicular attachments including a utility box (not shown), a seat assembly (108), a pillion handle (118) and a fuel tank assembly (not shown). Further, a center stand (116) is provided on a crankcase (206) to support the two wheeled vehicle (100) especially when the two wheeled vehicle (100) is parked.
[00024] A seat (108) is supported on the pair of side-tubes (109) on which a rider may sit. Generally, the utility box (not shown) is supported between the front portions of the left and right end of the pair of side-tubes (109) so as to be disposed below the seat (108). A fuel tank assembly (not shown) is disposed on between the rear portions of the pair of the side-tubes (109). There is a front brake (120) and a rear brake (114) arranged on the front wheel (119) and a rear wheel (113) respectively. The rear wheel (113) is supported towards the rear side of the frame assembly (105) by an internal combustion engine (101) which is horizontally coupled swingably to the rear of the frame assembly (105) of the two wheeled vehicle (100) through a rear suspension system (not shown). The IC engine (101) transfers the drive directly to the rear wheel (113) as it is coupled directly to it. The IC engine (101) comprises a continuously variable transmission (CVT) system, the CVT system disposed leftward of the IC engine (101) in the vehicle width direction. The CVT system is enclosed by a CVT cover (150), the outer portion of the CVT cover (150) is seen in the Fig. 1 with reference to the two wheeled vehicle.
[00025] Fig. 2 illustrates the side view of the rear portion of the two wheeled vehicle (100) illustrating the IC engine (101) swingably supported to the pair of side tubes (109) in accordance with the embodiment of the present subject matter. The IC engine (101) comprises a cylinder block (205) on which a cylinder head (204) is disposed forming a combustion chamber (not shown) at the junction. Air fuel mixture is burnt in the combustion chamber (not shown) which causes a piston to reciprocate within the cylinder block (205). The cylinder block (205) and cylinder head assembly (204) is mounted on a crankcase (206). The CVT system is enclosed within the CVT cover (150). The CVT system encloses a cooling fan (not shown) which draws air inside the CVT system to extract heat, the air drawn through an air intake structure (315). The air intake structure (315) is illustrated in Fig. 2, which is mounted on the left side tube (109). In prior art, the air was drawn at a distance of D1 from a ground level. The zone around the distance D1 is located adjacent to the cylinder block (205) and the crankcase (206). Due to burning of air fuel mixture inside the combustion chamber (not shown) there is heat generated which gets conducted throughout the IC engine (101) components. If air intake were to be targeted at a distance D1 from the ground level, then there is a chance that the air present adjacent to the IC engine (101) is drawn in. The, present subject matter alleviates this drawback by raising the air intake structure (315) above the hot zone at a distance D2 from the ground level. This permits cooler air to enter. Further in prior art, at an air intake near hot zone, there is increased tendency of foreign matter such as water, mud and dust entering due to its close proximity to the ground level. The present subject matter has the air intake structure (315) positioned at a distance (D2) higher (D2 > D1) than the original distance (D1) thus reducing the probability of foreign matter entering the air intake structure (315). Furthermore, the present subject matter prevents entry of hot air into the air intake structure (315) surrounding hotter regions of the IC engine (101). The cooling effect will also improve as hot air is prevented from coming into the air intake structure (315) to cool the CVT components.
[00026] Fig. 3a. illustrates the enlarged side view of the CVT cover (150) and the air intake structure. Further, Fig. 3b. illustrates the cross sectional view (Y-Y) of the air intake structure (315) according to the embodiment of the present subject matter. The air intake structure (315) is mounted to the pair of side tubes (109) extending rearward from the step through structure (117) of the frame assembly (105). The air intake structure (315) comprises of a cover member (301), an inlet member (302), and a connecting means connecting the inlet member (302) to an inlet aperture disposed on the CVT cover (150). The CVT cover (150) comprises a kick lever (150a) for channelizing the power from rider to the IC engine (101) and a drain plug (306) is disposed at the bottom to drain any water accumulated during process of cooling. The cover member (301) is securely mounted of the left side tube (109) of the frame assembly (105). The cover member (301) is made up of a material selected from a group consisting of steel, aluminum, and polymer. The cover member (301) comprises plurality of bosses (301a) having holes drilled on them, and matches with corresponding holes on the side member (109). Fasteners are inserted to secure the cover member (301) to the side tube (109). The cover member (301) has a rectangular cross sectional profile (as seen in Fig. 3b) with its longer edge parallel to an axis of the side tube (109) and its shorter edge has a length approximately equal to the diameter of the side tube (109). The inlet member (302) is made of metal alloy material and is rectangular shaped and a part of the inlet member (302) is enclosed completely within the cover member (301). One end of the inlet member (302) is welded securely to the surface of the side tube (109). One part of the inlet member (302) welded to the side tube (109) is enclosed completely within the cover member (301) and the other part projects outward of the cover member (301). The part of the inlet member (302) enclosed within the cover member (301) further comprises plurality of small pores (302a) formed in the outer peripheral surface of the enclosed part of the inlet member (302). Further, the strength of the frame assembly (105) is better with the air intake structure (315) disclosed in the present subject matter. As the cover member (301) of the air intake structure (315) is mounted to the pair of side tubes (109) through fasteners only.
[00027] The cover member (301) protects the inlet member (302) against foreign matter such as particles, stones, water, mud and dust. Further, the plurality of pores (302a) formed on an outer periphery (302b) of the enclosed part of the inlet member (302) prevents entry of water and mud from penetrating inside the air intake structure (315). When the two wheeled vehicle is moving on a water puddle or a subjected to mud splash from below, foreign matters (such as water and mud) either disperse outside the cover member (301) or breaches the cover member (301) to penetrate inside the cover member (301) through the gap between the cover member (301) & inlet member (302). The plurality of pores (302a) on the inlet member (302) prevents foreign matters (such as water and mud) from further ingress into the cover member (301). The cover member (301) is secured by fasteners and can be detached during servicing and repair. On detachment of the cover member (301), the inlet member (302) can be cleaned and made free of the foreign matter deposited around the inlet member (302) and the plurality of pores (302a).
[00028] A connecting means (303) such as a bellow (303) is used to connect the projected part of the inlet member (302) to the inlet aperture on the CVT cover (150). The bellow (303) has an approximately rectangular cross sectional profile with rounded edges and is made up of rubber or some flexible elastomer. In other embodiments, the bellow (303) can have various profiles with different edges as per the requirement in the two wheeled vehicle (100). The bellow (303) has ridges on its outer periphery that permit flexing and axial extension to connect the inlet member (302) to an inlet aperture (320). The bellow (303) is used to protect the entry and damage from foreign matter (particularly sharp objects and stones), impacts and other external elements. It also serves to prevent any leak of air as it is drawn in to the inlet aperture (320). The bellow (303) has two ends, both ends having a slightly larger profile to enable it to be inserted over the corresponding inlet member (302) and the inlet aperture (320). The ends will also utilize grooves which act as forming seats intended for receiving clamping devices (304) so as to ensure the leak tightness of the assembly. The present subject matter also results in increase in cooling efficiency of the CVT system by ensuring entrance to the air only inside the air intake structure (315). Further, the life-span of the air intake structure (315) also increase as foreign matters are prevented from entering into the air intake structure (315).
[00029] Fig. 4a. and Fig. 4b. illustrates the air flow circulation in the air intake structure (315) in facilitating the cooling of the CVT system, according to the embodiment of the present subject matter. During operation of the CVT system, the cooling fan (not shown) which is mounted to the first pulley (not shown) rotates along with the crankshaft (not shown) of the IC engine (101). The rotation of the cooling fan draws air from the intake aperture disposed on the CVT cover (150). Due to suction pressure created by the cooling fan, air is drawn from the intake structure inside the CVT cover (150). An air path (310) taken as the air is being drawn inwards is illustrated in Fig. 4a. and Fig. 4b. The air enters the space between the cover member (301) and the inlet member (302). After entering the cover member (301) chamber, the air penetrates the plurality of pores (302a) on the inlet member (302) and flows inside the CVT cover (150) through the bellow (303). On the inlet aperture (320) of the CVT cover (150), there can be an air foam filter (320a) which can further filter the air to render it free from fine dust particles before the air is made to flow across the CVT components on the inner surfaces of the CVT cover (150) such as the front pulley, the rear pulley, the belt, and the centrifugal clutch. The air is then routed out of the inner portion for the CVT cover (150) after extraction of heat through a hot air exit (305) is disposed on the rear of the CVT cover (150) and opposite to the inlet aperture (320). The above-mentioned illustration explained that the present subject matter prevents entry of hot air surrounding hotter regions of the IC engine (101).
[00030] Fig. 5 illustrates a cover wall enclosing a hot air exit according to the embodiment of the present subject matter. In present embodiment, the interior of the CVT cover (150) hiding the CVT components is shown. The hot air exit (305) is disposed opposite to the inlet aperture (320) and vents the air out of the CVT cover (150). The hot air exit (305) is a large opening curving the air and directing the air towards the ground of the two wheeled vehicle. The hot air exit (305) is formed as a part of the crankcase (206) which is enclosed by a cover wall (305a) made of plastic on that side of the hot air exit (305) exposed outward as shown in Fig. 5. The cover wall (305a) is mounted on the crankcase (206) with a single screw (305b) by means of a boss projection (305c). The cover wall (305a) protects the hot air exit (305) from entry of foreign particles such as water, mud and dust. The curved venting of air below the CVT cover (150) is advantageous as if straight air exit were to be provided, hot air being lighter tends to rise up and there is chance that it can impinge the various components of the two wheeled vehicle such as the fuel tank (not shown) disposed above the rear wheel (113). Hence, the hot air exit (305) is so shaped to curve and direct the air outside towards the ground level. In other embodiment, the hot air exit (305) is provided with a filter or mesh (not shown) so as to prevent entry of any foreign matters (such as water and mud) splashed during riding of the two wheeled vehicle (100) from the rear wheel (113) into the CVT cover (150).
[00031] Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the present disclosure may be practiced other than as specifically described.
,CLAIMS:We Claim:
1. A two wheeled vehicle (100) comprising:
a frame assembly (105) comprising:
a main tube (107), extending from a front portion of said two wheeled vehicle (100) to a rear portion along a longitudinal axis (F-R);
a pair of side tubes (109) extending longitudinally from said main tube (107) towards said two wheeled vehicle (100) rearward direction (R);
an internal combustion engine (101) swingably mounted on said frame assembly (105) in the rearward portion of said two wheeled vehicle (100);
a crankcase (206) accommodating said internal combustion engine (101); and
an air intake structure (315) to permit entry of the air into said crankcase (206);
wherein,
said air intake structure (315) is attached to one of said pair of side tubes (109), the air being permitted along an outer periphery (302b) of the enclosed part of an inlet member (302) to said air intake structure (315).

2. The two wheeled vehicle (100) as claimed in claim 1, wherein the attachment of the air intake structure (315) to one of the side tubes (109) comprises:
a cover member (301) is mounted on one of the side tubes (109), the inlet member (302) disposed partly within the cover member (301), and a connecting means connecting the inlet member (302) to an inlet aperture (320) disposed on the CVT cover (150).

3. The two wheeled vehicle (100) as claimed in claim 1, wherein the connecting means (303) is a bellow (303), the bellow (303) is extending from the inlet member (302) to the intake aperture (320).
4. The two wheeled vehicle (100) as claimed in claim 1, wherein the air intake structure (315) positioned at a distance (D2) higher (D2 > D1) than the original distance (D1).
5. The two wheeled vehicle (100) as claimed in claim 1, wherein the connecting means (303) has cross sectional profile selected from a group consisting of square, rectangular, polygonal profile.
6. The two wheeled vehicle (100) as claimed in claim 1, wherein the connecting means (303) is made of a material selected from a group consisting of rubber and flexible elastomer.
7. The two wheeled vehicle (100) as claimed in claim 1, wherein the connecting means (303) both ends having a slightly larger profile to enable it to be inserted over the corresponding the inlet member (302) and the inlet aperture (320).
8. The two wheeled vehicle (100) as claimed in claim 1, wherein plurality of pores (302a) are formed on the outer periphery (302b) of the enclosed part of the inlet member (302).
9. The two wheeled vehicle (100) as claimed in claim 1, wherein a hot air exit (305) is disposed on the rear of the CVT cover (150) and opposite to the inlet aperture (320).
10. The two wheeled vehicle (100) as claimed in claim 1, wherein the air intake structure (315) is mounted to the pair of side tubes (109) extending rearward from a step through structure (117) of the frame assembly (105).