DESC:TECHNICAL FIELD
[0001] The present invention relates generally to a saddle type vehicle. More particularly, the present invention relates to a cooling system employed to cool the internal combustion engine of the saddle type vehicle.
BACKGROUND
[0002] An internal combustion engine converts thermal energy obtained from burning of a fuel with an oxidizer (air) into mechanical energy, which can be employed to do a wide variety of mechanical work. It is used in a wide range of applications including providing motive force for movement of an automobile. One such type of automobile powered by an internal combustion engine is a step-through type two-wheeled vehicle, colloquially called scooter. The main parts of the internal combustion engine include a cylinder head, a reciprocating piston on a cylinder block and a connecting rod which connects the piston to the reciprocating crankshaft. During operation of the internal combustion engine, the burning of fuel and oxidizer occurs in the cylinder block and transfers mechanical energy to the reciprocating piston. This operation generates lot of thermal energy in and around the cylinder block. This thermal energy increases the temperature of the cylinder block and the atmospheric air surrounding it. Hence, it is necessary to cool the cylinder block, its associated components and the surrounding air.
[0003] IC engines of step-through saddle type vehicle such as scooter usually employ an air cooling system which enables cooling of the engine assembly or the cylinder block to be particular. Generally, the air cooling system comprises of a cooling fan operably connected to the crankshaft, an air cooling inlet and a shroud assembly. The shroud assembly covers the entire internal combustion engine, such that the air sucked in by the cooling fan is re-circulated around the shroud to cool down the hot zones of the internal combustion engine. The air cooling intake is formed above the cooling fan enabling an entrance for atmospheric air which is sucked in by the cooling fan and re-circulated for an efficient working of the air cooling system. In furtherance to it, a deflector is provided in an opposite portion of the shroud where the air cooling intake is formed, which enables an efficient recirculation of air in the opposite portion as well.
[0004] However, the main concern for such above mentioned systems is the amount of air entering through the air cooling inlet for the cooling fan to suck in and circulate. Generally, the air cooling inlet provided on the shroud is a substantial cylindrical shaped element protruding outwards in a direction away from the internal combustion engine, in a vehicle width direction. In a running condition of the vehicle the cooling fan tries to suck in the air which is around or passes through a region around the shroud. However, a substantial amount or air passes without being forced in by the fan cover shroud. The path flow of air passing through is always continuous, creating a difficulty for the cooling fan in enabling suction of the air passing through. Therefore, in order to solve this problem there have been some new designs being implemented through which a part of the air passing through is blocked and stagnated in a region from where it can be forced in. One of such designs is one where the air cooling inlet is designed like a staircase structure which blocks some of the air passing through and forces it in for the cooling fan to circulate. However, the efficiency level achieved through such a design is low & thus not very attractive for implementation.
[0005]
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] 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.
[0007] Fig. 1 illustrates a right side view of an exemplary two-wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0008] Fig. 2 illustrates a right side view of a frame structure of the exemplary two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0009] Fig. 3 illustrates a front view of the frame structure of the exemplary two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[00010] Fig. 4 illustrates a front view of a cowl used in an air cooling system of the exemplary two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[00011] Fig. 5 illustrates a side view of the cowl used in an air cooling system of the exemplary two-wheeled vehicle in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[00012] Thus there is a need to have a cooling system through which an ample amount of air is provided for the cooling fan to circulate at good efficiency. In furtherance to it, the present subject matter aims to provide a cooling system which overcomes all problems in known art & is feasible to implement.
[00013] 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 is installed in a step through saddle type vehicle. It is pertinent to note that the power train system, for example, an internal combustion engine, an electric traction motor may be mounted in two-wheeled or three wheeled vehicles in different arrangements such as in transverse and longitudinal fashion. However, in the ensuing description, such power train is transversely mounted at a lower portion of the step through type vehicle. It is contemplated that the concepts of the present invention may be applied to other types of vehicles within the spirit and scope of this invention.
[00014] Generally, the internal combustion engine provides power to the vehicle by combustion of an air-fuel mixture supplied to it. Mostly, the internal combustion engine comprises of a cylinder head, a reciprocating piston on a cylinder block and a connecting rod which connects the piston to the reciprocating crankshaft. During operation of the internal combustion engine, the burning of fuel and oxidizer occurs in the cylinder block and transfers mechanical energy to the reciprocating piston.
[00015] Such an operation of the internal combustion engine requires burning of air-fuel mixture occuring in a combustion chamber formed between the cylinder head and the cylinder block. This operation generates lot of thermal energy in and around the cylinder head and cylinder block and increases the temperature of the space surrounding it. If this thermal energy is not dissipated, it may result in the failure of the cylinder head and cylinder block. Also, large temperature differences may lead to a distortion of the internal combustion engine components due to the thermal stresses set up. It is also seen that higher temperatures also lower the volumetric efficiency of the internal combustion engine. Hence, it is necessary to cool the cylinder block, its associated components and the surrounding air. Generally, a cooling system is required to cool the internal combustion engine components.
[00016] Typically, in a step-through type vehicle such as a scooter, a swinging internal combustion engine is located below the seat at a lower rear portion of the vehicle. The internal combustion engine is swingably supported by rear suspension system and attached to the frame of the vehicle. Cylinder block of such internal combustion engines are enclosed by peripheral components and are heated up during their operation. Thus, to provide an enhanced air cooling to the internal combustion engine a forced air cooling system is provided. In this system, atmospheric air is drawn inside the cooling system through a cooling fan from the outer atmosphere and re-circulated to cool down the hot zones of the internal combustion engine. Generally, the air cooling system comprises of a cooling fan operably connected to the crankshaft, an air cooling inlet and a shroud assembly. The shroud assembly covers the entire internal combustion engine, such that the air sucked in by the cooling fan is re-circulated around the shroud assembly to cool down the hot zones of the internal combustion engine. The air cooling intake is formed above the cooling fan enabling an entrance for atmospheric air which is sucked in by the cooling fan and re-circulated for an efficient working of the air cooling system. In furtherance to it, a deflector is provided in an opposite portion of the shroud where the air cooling intake is formed, which enables an efficient recirculation of air in the opposite portion as well.
[00017] Although cooling of the cylinder block of the internal combustion engine is necessary, a conventional forced cooling system always faces scarcity in the amount of air entering in the system which is to be re-circulated by the cooling fan. Generally, the air cooling inlet provided on the shroud is a substantial cylindrical shaped element protruding outwards in a direction away from the internal combustion engine, in a vehicle width direction. In a running condition of the vehicle the cooling fan tries to suck in the air which is around or passes through a region around the shroud. However, a substantial amount of air passes without being forced in by the fan cover shroud. The path flow of air passing through is always continuous, creating a difficulty for the cooling fan in enabling suction of the air passing through. Therefore, in order to solve this problem there have been some new designs being implemented through which a part of the air passing through is blocked and stagnated in a region from where it can be forced in. One of such designs is one where the air cooling inlet is designed like a staircase structure which blocks some of the air passing through and forces it in for the cooling fan to circulate. But the efficiency level achieved by implementing such designs was low and implementing such designs was not feasible.
[00018] The present invention aims to address the above drawbacks by providing a forced cooling system that can provide an ample amount of air for the cooling fan to re-circulate and cool the internal combustion engine. The present subject matter aims to provide an air cooling system in which a substantial amount of air is blocked and supplied to the cooling fan by providing a design which is feasible to implement as well.
[00019] In an embodiment in accordance with the present subject matter, a scooter type vehicle is provided with an air cooling system having an efficient opening for entry of substantial amount of air in the system to cool the internal combustion engine. Generally, the air cooling system comprises of a cooling fan operably connected to the crankshaft, an air cooling inlet and a shroud assembly. The shroud assembly covers the entire internal combustion engine, such that the air sucked in by the cooling fan is re-circulated around the shroud assembly to cool down the hot zones of the internal combustion engine. The air cooling system comprises of an air cooling intake formed on the shroud assembly above the cooling fan. The air cooling inlet comprises of an opening which enables an entrance for atmospheric air into the air cooling system sucked in by the cooling fan and re-circulated for an efficient working of the air cooling system. The air cooling inlet enables the entry of air in the air cooling system which is to be circulated for cooling of the internal combustion engine.
[00020] In an embodiment, the shroud assembly comprises of a left side shroud portion and a right side shroud portion, wherein both left hand and right hand portions combine to form the shroud assembly covering the internal combustion engine. The air cooling inlet is formed on the left hand side shroud portion above the cooling fan to provide an entrance for the atmospheric air into the air cooling system, which is sucked in by the cooling fan to re-circulate. In an embodiment, the air cooling inlet formed projects out in a longitudinal direction away from the left hand side shroud portion in a vehicle width direction, when seen from a front side of the vehicle. The projection of the air cooling inlet is a substantial cylindrical shaped extension disposed on the left hand side shroud portion when seen from a front side of the vehicle. The cylindrical air cooling inlet has an increasing cross sectional profile such that a part of the surface ends up to be formed on a vertical axis (XX’), wherein said axis (XX’) is formed vertically with respect to a side of the vehicle, and extending in vertically paralle to said vehicle when seen from a front view of the vehicle. When viewed from the vehicle front, the axis (XX’) is formed in front of another vertical axis (YY’) on which the remaining part of the surface is formed, wherein said axis (YY’) is formed vertically with respect to a side of the vehicle, and extending vertically paralle to said vehicle when seen from a front view of the vehicle. The air cooling inlet comprises of an opening through which air enters into the air cooling unit. The opening which is formed on top of the air cooling inlet is not in an even plane, as a part of the opening is formed on axis (XX’), while the remaining part of the opening is formed on the axis (YY’). The profile of the opening formed between the two axes is substantial elliptical shaped.
[00021] In an embodiment, the air cooling inlet has a longitudinal increasing cross sectional profile such that, partial curved surface A is formed on an XX’ axis, while a curved surface B is formed on the YY’ axis. In an embodiment, the cross-sectional profile formed across a plane BB’ around the opening lies between the two axes (XX’ & YY’) as defined above has a substantially elliptical profile, such that a part of the opening formed around curved surface A is formed on XX’ and other part of the opening formed around curved surface B lies on YY’ In an embodiment, a frustum formed at the top of the air cooling inlet has a gradually increasing profile extending in an upward rearwardly fashion when seen from a front side of the vehicle, such that air flowing opposite to the vehicle running direction falls perpendicularly on the air cooling inlet. Thus, the wind falls perpendicularly on curved surface B as well, resulting in blocking of the passing air by curved surface B. Hence, the gradually increasing cross sectional profile formed enables in an efficient intake and capture of atmospheric air. This capture allows a substantial part of the air to get accumulated at the opening such that an ample amount is available for entering in the air cooling system.
[00022] With the above proposed invention as per the present subject matter, the following advantages can be obtained such as availability of ample amount of air for the air cooling system by blocking and accumulating the air flowing towards the vehicle, opposite to the vehicle travel direction. The present subject matter greatly enhances the efficiency of the cooling system & is adequately feasible for implementation with least impact on vehicle layout & packaging. In furtherance to it, the design is much more feasible and easy to implement with a simple manufacturing.
[00023] 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.
[00024] In relation to the following description of embodiment(s), arrows as and where provided in the top right corner of each figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow Up denotes upward direction, an arrow Dw denotes downward direction. Also, an arrow with LH denotes a left side, and an arrow with RH denotes a right side. All aforementioned directions are with respect to the vehicle.
[0001] Fig. 1 illustrates a right side view of the scooter type vehicle in accordance with an embodiment of the present subject matter. The vehicle 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 head tube (102) is disposed towards the front portion, wherein 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).
[0002] The head tube (102) is configured to rotatably support a steering tube (104) and further connected to the front suspension system (not shown) 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). 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). The pair of side-tubes (109) extends from the other end of the main tube (107) and are disposed parallel on either side of the vehicle width direction. Each of the said side tube (109) includes a down frame section (109a) inclined and extending from the main tube (107) 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) and a fuel tank assembly (not shown).
[00025] 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). The exhaust emission system (116) can be seen disposed at the side extending rearward coupled to the frame assembly. There is front brake (not shown) and rear brake (114) arranged on the front wheel (119) and a rear wheel (113) respectively. The rear wheel (113) is covered by a rear fender (111) with a tail light (112) disposed above it and a support bar (118) place above it at the end of the seat assembly (108). The rear wheel (113) is supported towards the rear side of the frame by the internal combustion (IC) engine (101) which is horizontally coupled swingably to the rear of the frame assembly of the two-wheeled vehicle through a rear suspension system (not shown). An air cooling system (110) is provided for the IC engine (101) which helps in cooling the assembly because of the excess heat generates within it. The IC engine (101) transfers the drive directly to the rear wheel (113) as it is coupled directly to it through a continuously variable transmission (CVT) system.
[00026] Fig. 2 illustrates a right side view of the frame assembly (105) of the exemplary two-wheeled vehicle (50) as shown in Fig. 1, in accordance with an embodiment of the present subject matter. In an embodiment, the frame structure (105) functions as a skeleton and backbone of the vehicle, holding the whole vehicle (50) together with all the parts assembled over it. The internal combustion engine (101) which powers the vehicle (50) is swingably mounted on the frame assembly (105). In an embodiment, the air cooling system (110) comprises of a cooling fan (not shown), a shroud assembly (120), and an air cooling inlet (115) formed on the shroud assembly (120). The shroud assembly (120) comprises of a left hand side shroud portion (120L) and right hand side shroud portion (120R) (shown in Fig 3), wherein both the left hand side and right hand side shroud portion combine to form the shroud assembly (120) covering the internal combustion engine (101). In an embodiment, the air being sucked in by the cooling fan is re-circulated in the space provided between the shroud assembly (120) and the internal combustion engine (101) to keep the temperature of the internal combustion engine (101) under check. The exhaust emission system (116) is connected to the internal combustion engine (101) to oxidize and discharge the exhaust generated by it. In an embodiment, an air cooling inlet (115) is formed on the shroud assembly (120), located just above the cooling fan. The air cooling inlet (115) formed works as an entrance of air in the air cooling system (110). The cooling fan sucks in the air present around the vehicle (50) in that region of air cooling inlet (115) or the air passing through its side in the running condition of the vehicle (50), and later re-circulates it around the internal combustion engine (101) for its efficient cooling.
[00027] Fig. 3 illustrates a front view of the frame assembly (105) of the exemplary two-wheeled vehicle (50) as shown in Fig. 1, in accordance with an embodiment of the present subject matter. From the figure, the shroud (120) assembly can be seen to comprising of left hand side shroud portion (120L) and right hand shroud portion (120R), wherein both the sides (120L, 120R) combine to from the shroud assembly (120) covering the internal combustion engine (101). In an embodiment, when viewed from front the air cooling inlet (115) can be seen to be disposed on the left hand side shroud portion (120L). The opening created for entrance of air, i.e. the air cooling inlet (115) can be seen to projecting outwards from the left hand side shroud portion (120L) in a width wise direction of the vehicle (50) when seen from a front side. As explained above, the air cooling inlet (115) provides an opening for the air cooling system (110) through which it sucks in air to be re-circulated within the shroud assembly (120) for cooling the internal combustion engine (101). In an embodiment, the air cooling inlet (115) is a substantial cylindrical shaped element comprising of partial curved surface A (shown in Fig. 5) and partial curved surface B (shown in Fig. 5), wherein the partial curved surfaces combined form the air cooling inlet (115). In furtherance to it, the air cooling inlet comprises of an opening (115O) through which atmospheric air enters into the air cooling system (110). The air cooling inlet (115) has a longitudinal increasing cross sectional profile such that, a part of its curved surface (curved surface A) is formed on an XX’ axis, wherein said axis XX’ is formed vertically with respect to vehicle height and being parallel to it, when seen from a front view of said vehicle. The remaining curved surface (curved surface B) is formed on axis YY’, wherein said axis YY’ is formed vertically with respect to vehicle height and being parallel to it, when seen from a front view of said vehicle. Such a construction is due to the increasing cross sectional profile of the opening (115O). The gradually increasing cross sectional profile formed across a plane BB’ (shown in Fig. 5) around the opening (115O) lies between the two axes (XX’ & YY’) has a substantially elliptical profile, such that a part of the opening (115O) is formed on axis XX’ and other part of the opening (115O) is formed on YY’ axis. In furtherance to it, axis YY’ lies rearward axis XX’, when seen from the vehicle front, such that height of curved surface B formed on axis YY’ is greater than the height of the curved surface A formed on axis XX’. In an embodiment, the air flowing opposite to the vehicle running direction falls perpendicularly on the air cooling inlet (115). Thus, the wind falls perpendicularly on curved surface B as well, resulting in of the passing air by curved surface B. This blocking allows a substantial part of the air to get accumulated at the opening (115O) such that an ample amount of air is available for entering in the air cooling system (110).
[00028] Fig. 4 illustrates a front view of the air cooling inlet (115) formed on left hand side shroud portion (120L) of the exemplary two-wheeled vehicle (50) as shown in Fig. 1, in accordance with an embodiment of the present subject matter. In an embodiment the air cooling inlet (115) is formed on the left hand side shroud portion (120L). The air cooling inlet (115) is formed above the cooling fan (not shown)lying exactly above the cooling fan in a same line of axis allowing a direct entry of the air from the air cooling inlet (115) to the air cooling system (110). The air cooling inlet (115) placed above the cooling fan projects out from the left hand side shroud portion (120L) extending away from the internal combustion engine (101) in a vehicle (50) width wise direction when seen from a front side of the vehicle (50). This enables the invention as per present subject matter to be adequately compact & packaged within the lateral & vertical space of the vehicle leading to compact vehicle layout. In an embodiment, the air cooling inlet (115) projecting outward is a substantial cylindrical shaped structure with a gradually increasing cross sectional profile. Thus, the present figure depicts that the opening (115O) of the air cooling inlet (115) is not even. The opening (115O) has a gradually increasing cross sectional profile such that a part of the opening is formed at an axis (YY’) formed rearwardly of another axis (XX’) when viewed from the vehicle front, on which the other part of the opening (115O) is formed. A substantial part of the opening (115O) formed on axis (YY’) enables in an efficient capturing of the air which is circulated within the air cooling system (110).
[00029] Fig. 5 illustrates a top view of the air cooling inlet (115) of the air cooling system (110) of the exemplary two-wheeled vehicle (50) as shown in Fig. 1, in accordance with an embodiment of the present subject matter. In an embodiment, the air cooling inlet (115) is formed on the left hand side shroud portion (120L) of the shroud assembly (120) when seen from the front of the vehicle. The opening (115O) of the air cooling inlet (115) provides an entrance for air in the air cooling system (110). The purpose for the air cooling inlet is (115) to provide an entry for an ample amount of air which the cooling fan can suck in for the air cooling system (110) to use. To achieve this objective the air cooling inlet (115) has been designed in such a manner that it captures, blocks and stagnates a substantial amount of air present around it which the cooling fan can suck for the air cooling system (110) to be used. It thereby substantially increases the frontal impingement area for the air. The air cooling inlet (115) has been designed in such a fashion that it’s opening (115O) has an increasing cross sectional profile. A part of the opening (115O) is formed on an axis (YY’) which is disposed rearwardlyof the axis (XX’), when viewed from the vehicle front, on which the remaining part of the opening (115O) is formed. This means that the part formed on axis (XX’) enables a sufficient capturing of the air passing by, such that the blocked and stagnated air by it, is circulated. In an embodiment, the air cooling inlet (115) projects out from the left side shroud portion (120L), extending away from the engine assembly (101) in a vehicle (50) width wise direction when seen from a front side of the vehicle (50).
[00030] In an embodiment, the air cooling inlet (115) is a cylindrical shaped structure projecting out from the left side shroud portion (120L). When bisected from centre through an axis AA’ the air cooling inlet (115) can be seen to comprising of a partial curved surface A and a partial curved surface B, wherein both curved portions combine to form the air cooling inlet (115). Thus, the present subject matter provides an air cooling system (110) which is much more efficient. The air cooling system (110) comprises of a fan cover shroud (115) which is formed in the cowl (110) of the air cooling system. The fan cover shroud (115) is a substantially cylindrical shaped structure with a gradually increasing cross sectional profile, such that a part of the curved surface (curved portion B) is formed on axis (YY’) which is disposed rearwardly of the axis (XX’) on which the remaining curved surface (curved portion A) is formed. In furtherance to it, axis YY’ lies rearwardly of axis XX’ such that height of curved surface B formed on axis YY’ is greater than the height of the curved surface A formed on axis XX’. In an embodiment, the circular trajectory of the top portion of the fan cover shroud (115) is not even, since a part of it is formed on higher plane as compared to the remaining part because of the gradually increasing cross sectional profile. Thus, the gradually increasing cross sectional profile formed across plane BB’ having a substantially elliptical profile and formed between axis XX’ and YY’ enables in an efficient accumulation / stagnation and blocking of atmospheric air since the air gets trapped there. Therefore, the curved portion formed at a higher plane (curved portion B) combined with the substantially elliptical profile formed across BB’ blocks a substantial amount of air which is stagnated at that entry region of the fan cover shroud (115). This helps in easy suction of the air by the cooling fan which is in turn used for the air cooling system (110).
[00031] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. 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 saddle type vehicle (50) comprising:
a frame assembly (105), a head tube (102) formed at a front portion of said vehicle (50) ,a main tube (107) extending in a downward and rearwardly direction from said head tube (102) to form a step through structure (117);
a power train system (101) swingably attached to rear portion of said step through structure (117) of said main tube (107);
a shroud assembly (120) enabled to cover said power train system
(101) ; and
an air cooling system (110) comprising an air cooling inlet (115) disposed on said shroud assembly (120), enabled to allow an entry for atmospheric air into said air cooling system (110), wherein said air cooling inlet (115) projects outwards in a width wise direction of said vehicle (50) and comprising a cylindrical profile with an uneven shaped opening (115O) when seen from a front side of said vehicle (50).
2. The saddle type vehicle (50) as claimed in claim 1, wherein said shroud assembly (120) comprises of a left-hand side shroud portion (120L) and a right-hand side shroud portion (120R), wherein said left hand side shroud portion (120L) and said right hand side shroud portion (120R) combine to from said shroud assembly (120).
3. The saddle type vehicle (50) as claimed in claim 1, wherein said air cooling inlet (115) is disposed on said left hand side shroud portion (120L) when seen from a from a front side of said vehicle (50).
4. The saddle type vehicle (50) as claimed in claim 1, wherein said air cooling inlet (115) comprises of gradually increasing cross sectional profile resulting in formation of an uneven periphery for said opening (115O).
5. The saddle type vehicle (50) as claimed in claim 1, wherein said air cooling inlet (115) comprises of a gradually increasing frustum in an upward rearwardly fashion when seen from a front side of said vehicle (50).
6. The saddle type vehicle (50) as claimed in claim 1, wherein said air cooling inlet (115) comprises of a partial curved surface A and a partial curved surface B when said air cooling inlet (115) is bisected vertically through its center by an axis AA’, wherein said partial curved surface A and said partial curved surface B combine to form said air cooling inlet (115).
7. The saddle type vehicle (50) as claimed in claim 1 or claim 6, wherein said air cooling inlet (115) comprises a longitudinally increasing cross-sectional profile resulting in formation of said partial surface A at a vertical axis XX’ and formation of said partial curved surface B at a vertical axis YY’ disposed rearwardly of said axis XX’.
8. The saddle type vehicle (50) as claimed in claim 1 or 7, wherein said opening (115O) formed about a plane BB’ and between said partial curved surface B located about said axis YY’ and said partial curved surface A located about said axis XX’, .
9. The saddle type vehicle (50) as claimed in claim 8, wherein said opening (115O) has a substantially elliptical profile.