An engine cooling system for a two-wheeled vehicle

Abstract

The present invention provides an engine cooling system (100) for a two wheeled vehicle comprising an engine (102) mounted on a vehicle frame structure (104), a pair of wheels including a front wheel (106) and a rear wheel (108), wherein a fender assembly (110) positioned over the front wheel (106). An air guide unit (112) provided on each side of the front wheel (106) and configured to direct the ambient air towards at least the engine (102). A front fork (122, 304) disposed at a front portion of the vehicle frame structure (104) on either side of the front wheel (106), wherein each of the front fork (122, 304) includes a front fork connecting member (305); and wherein the front fork connecting member (305) is configured to attach at least the air guide unit (112, 200) and the fender assembly (110, 300).

Description

[0001] AN ENGINE COOLING SYSTEM FOR A TWO- WHEELED VEHICLE

[0002] FIELD OF INVENTION:

[0003]

[0001] The present invention relates to a two-wheeled vehicle and more particularly relates to an engine cooling system for the two-wheeled vehicle with improved cooling efficiency.

[0004] CROSS REFERENCE TO RELATED INVENTION

[0005]

[0002] This invention takes priority from an earlier filed provisional patent application no. 202421072154 filed on September 24, 2024; which is incorporated herein as reference.

[0006] BACKGROUND OF INVENTION:

[0007]

[0003] A typical two-wheeled motorcycle type vehicle comprises of a frame, a pair of wheels one at front and other at rear of the frame, an engine mounted on the frame between the wheels, a transmission system working in tandem with the engine, and other components such as a fuel tank, illuminating devices, seat, battery, fork tubes, fenders, etc. mounted on the frame. The engine is a primary component of two-wheeled vehicle responsible for driving the vehicle. The engine’s thermal characteristics are key contributors to it’s effective performance and longevity, which are managed through various cooling techniques. In automotive industry, various types of cooling arrangement are employed for internal combustion engines to protect them from the adverse effects of high heat generated in combustion chamber and to maintain the engine within optimal temperature conditions for efficient operation.

[0008]

[0004] Conventional cooling arrangements employed for vehicle engines are broadly classified into air-cooled engines, oil-cooled engines or liquid-cooled engines. The air-cooled engine uses fins provided on the outer surface of the engine, allowing air to pass through the fins, thereby aiding in cooling the engine. The oil or liquid cooled engine uses oil or coolant circulated through the channels formed within the engine walls for cooling purpose. The oil or coolant takes away heat from the heated part of the engine and is pumped through a radiator which cools down the oil or coolant. Thus, the oil cooling system and liquid cooling system utilize large number of additional and complex components such as radiator i.e. an external heat transfer arrangement system. Additionally, forming channels or fins on the engine surface is complex. Often, only air or liquid cooling is not sufficient to cool the engine surface adequately, so, they are used in combination, specifically for high capacity engines.

[0005] The type of cooling arrangements used in two-wheeled vehicles depends on various factors, primarily the type of two-wheeler, engine capacity, etc. For low-cost vehicles, using the external heat exchanger or coolant is not a viable option owing to cost constraints. As a result, the engine thermal management is typically achieved using air cooling, wherein naturally incoming ambient air cools the engine surface. The air-cooling provides a low-cost and simple solution for certain types of vehicles. However, in some cases, the two-wheeled vehicle engine employing only air-cooling system or combination of air-cooling system and liquid cooling system do not provide adequate engine cooling due to inefficient air flow towards engine for cooling.

[0009]

[0006] The above-mentioned inefficient air cooling in the two-wheeled engine is often addressed by increasing the flow of air towards the engine. This is achieved through utilizing different configurations having air guides, air deflectors, etc. However, these configurations often fail to provide uniform cooling owing to the constraints related to the engine orientations and areas where airflow is obstructed, such as the cylinder head surface of the engine assembly. Furthermore, additional complex parts need to be designed which increases cost. In certain scenarios, even when air guides, air deflectors, etc. are attached to a front portion of the two wheeled vehicle for directing ambient air towards the engine, the mounting arrangement may not possess adequate strength to withstand the impact of incoming air at high speed of the vehicle. Such insufficient structural integrity may not only reduces the effectiveness of the cooling function but may also pose a safety risk to the rider by causing instability or unintended detachment of the mounted components.

[0010]

[0007] Based on the above explanation, the current engine cooling arrangement relies heavily on incoming ambient air, which gets re-directed towards engine for cooling it externally. However, in most of the scenarios such ambient air is not sufficient to cool the engine resulting in significant reduction in engine efficiency.

[0011]

[0008] Another challenge arises when vehicle components obstruct the flow of ambient air towards the engine for e.g. enlarged diameter of the front fork tubes, widely extended fender, etc. The diameter of the front fork tubes is often increased due to design and vehicle requirements, more particularly the diameter of the aesthetic coverings on the front fork is increased. In such newly designed enlarged front fork tubes, an air obstruction is created, i.e. high resistance to air flow towards the engine. This resistance further aggravates the air cooling issue causing the engine to overheat and reducing it’s efficiency. Hence, there is limited possibility of aesthetical change in the front fork tubes as it hampers the air-cooling efficiency.

[0012]

[0009] Therefore, as explained above, there is a clear need to address the aforementioned inefficiencies and inadequacies provided in a two-wheeled vehicle engine. The vehicle must be equipped with improved air cooling system that, improves air flowing channel while being simple, sturdy and cost effective compared to existing complex and costly cooling system. Further, the arrangement shall ensure the ease of aesthetical change with optimum engine efficiency through the improved air cooling system in the two wheeled vehicle.

[0013] OBJECTIVES OF THE INVENTION:

[0014]

[0010] An object of the present disclosure is to ameliorate the existing air cooling in an engine of two wheeled vehicle.

[0015] [Oi l] Another objective of the present disclosure is to ensure uniform air cooling of the engine unit in the two wheeled vehicle.

[0016]

[0012] Yet another objective of the invention is to optimize airflow towards the engine, thereby alleviating air diversion.

[0017]

[0013] Another objective of the present invention is to maximize the flow of air toward the engine.

[0018]

[0014] Another objective of the present invention is to provide a cost effective, sturdy and simple design for the improved air cooling system of a two wheeled vehicle engine.

[0019]

[0015] Other objects and advantages of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.

[0020] SUMMARY OF THE INVENTION:

[0016] With these objectives in view, the present invention provides an engine cooling system for a two wheeled vehicle, the system comprising: an engine mounted on a vehicle frame structure; a pair of wheels including a front wheel and a rear wheel; a fender assembly positioned over the front wheel; an air guide unit provided on each side of the front wheel and configured to direct the air towards at least the engine; a front fork disposed at a front portion of the vehicle frame structure on either side of the front wheel, wherein each of the front fork includes a front fork connecting member; wherein the front fork connecting member is configured to attach at least the air guide unit and the fender assembly.

[0021]

[0017] The air guide unit comprises of a first surface and a second surface, wherein a gap is provided between the first surface and the second surface for allowing the flow of air therebetween. The first surface is relatively away from the fender assembly compared with the second surface. The second surface of the air guide unit has a back side, wherein the back side of the second surface is configured to be mounted on the fender assembly using mounting means. The first surface and the second surface are connected to form a single closed unit.

[0022]

[0018] The vehicle frame structure comprising a head tube; a main frame extending rearwardly from the head tube, the main frame capable of mounting a fuel tank assembly, and a downtube extending rearwardly and downwardly from the head tube. The engine is mounted on the main frame, preferably a single cylinder, vertically mounted engine. The engine comprises of a cylinder head joined with a cylinder block forming an airtight connection. A crankcase is provided below the cylinder block and includes vehicle transmission.

[0023]

[0019] The vehicle includes a front fork which is mounted on a forward portion of the vehicle frame, the front fork being configured to rotatably support the front wheel and to facilitate steering of the two-wheeled vehicle. The fender assembly includes a fender comprising plurality of downwardly extending portions on either side of the front wheel. The fender is slidably mounted on the front fork. The fender includes a front downwardly extending portion positioned forward of the front fork and a rear downwardly portion positioned rearward of the front fork The pair of air guide units are mounted on the front downwardly extending portions of the fender on either side of the front wheel. Furthermore, the fender assembly includes a brace member positioned on an inner side of the fender. The brace member is mounted on the fender assembly using suitable mounting means. The brace member includes a front downward extension positioned forward of the front fork and a rear downward extension positioned rearward of the front fork on either side of the front wheel. The rear downwardly extending portions of the fender and the rear extensions of the brace are bolted together with the front fork.

[0024]

[0020] The front fork includes a front fork outer tube attached with the front fork connecting member. The front fork connecting member is configured to attach the air guide units onto the front fork outer tube. The front fork connecting member forms an integral part of the front fork, and the front fork connecting member are provided on both of the front fork outer tube. The front fork connecting member comprises a front end and a rear end, along the length of the vehicle. The front end is positioned forward of the front fork and the rear end is positioned rearward of the front fork. The front end of the connecting member is configured for fastening the front downwardly extending portion of the fender, the front downward extension of the brace member and the air guide unit on either side of the front wheel. The rear end of the front fork connecting member is configured for fastening the rear downwardly extension portion of the fender and the rear downward extension of the brace member. The fastening means are employed for assembling of above-mentioned components into a sturdy unit or rigid connection. The arrangement is symmetrically provided on both lateral sides of the fender i.e., on the left-hand side and the right-hand side of the fender or wheel.

[0025]

[0021] The front fork connecting member may be integrally formed on the front fork outer tube.

[0026]

[0022] The second surface back side of the air guide unit is contoured to align with the side profile of the front fender and the second surface is mounted on the front fender using fastening means. The first surface of the air guide unit is angled to form diversion with respect to the second surface to guide the incoming airflow towards the engine, it’s design includes aerodynamic features to minimize drag while maximizing cooling efficiency. Preferably, the air guide unit is oriented towards the engine to facilitate maximum air flow.

[0023] According to a preferred embodiment of the present invention, the top end and the bottom end of the air guide unit lies within vertical limits of the engine, when viewed from the side of the vehicle.

[0027]

[0024] According to one of the embodiment of present invention, an engine cooling system for a two wheeled vehicle further comprises an air deflector assembly provided rearward of the front wheel and ahead of the engine, wherein the air deflector assembly is mounted above the front wheel when viewed from front of the vehicle. The air deflector assembly comprises louvers with plurality of opening configured to direct air towards engine. A set of fuel tank covers are provided on either side of the air deflector assembly wherein the fuel tank covers are mounted on the front and downward side of the fuel tank. The air deflector assembly comprises of two deflector units, wherein each deflector unit has an inner end and an outer end. The inner end of each air deflector is mounted on the downtube of the vehicle frame and the outer end of each air deflector is mounted on the fuel tank cover.

[0028]

[0025] According to a preferred embodiment of the present invention, the cooling system may be utilized to cool a power source such as battery unit in a two wheeled electric vehicle.

[0029]

[0026] According to a preferred embodiment of the present invention, the pair of air guides may be mounted on the front fork connecting member.

[0030] BRIEF DESCRIPTION OF DRAWINGS:

[0031]

[0027] The above and other objects, features, and advantages of the present disclosure will be more apparent from the detailed description taken in conjunction with the accompanying drawings. One or more embodiments of the present invention are now described, by way of example only with reference to the accompanied drawings wherein like reference numerals represent like elements:

[0032]

[0028] Fig. 1 illustrates an engine cooling system for a two wheeled vehicle, according to an embodiment of the present disclosure;

[0033]

[0029] Figs. 2a and 2b illustrates an air guide unit, according to an embodiment of the present disclosure;

[0034]

[0030] Figs. 3a - 3e illustrate different views of a fender assembly, according to an embodiment of the present disclosure;

[0031] Fig. 4 illustrates the air guide unit arrangement with respect to the engine, according to an embodiment of the present disclosure;

[0035]

[0032] Figs. 5a - 5b illustrate an air deflector assembly for a two wheeled vehicle, according to an embodiment of the present disclosure; and

[0036]

[0033] Figs. 6a - 6d illustrate ambient air flow over the engine of the two wheeled vehicle, according to an embodiment of the present disclosure.

[0037] DETAIL DESCRIPTION OF DRAWINGS:

[0038]

[0034] A preferred embodiment will now be described in detail with reference to the accompanying drawings. The preferred embodiment does not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.

[0039]

[0035] It will be readily understood that components of present invention as generally described and illustrated in figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following more detailed description of the embodiments of the invention as represented in the figures is not intended to limit the scope of the invention but is merely representative of certain examples of presently contemplated embodiments in accordance with the invention. The presently described embodiments will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout.

[0040]

[0036] Fig. 1 illustrates an engine cooling system (100) for a two wheeled vehicle, comprising an engine (102) mounted on a vehicle frame structure (104), a pair of wheels including a front wheel (106) and a rear wheel (108), wherein a fender assembly (110) is positioned over the front wheel (106). The fender assembly (110) is mounted with air guide unit (112) on either side of the front wheel (106) to direct ambient air towards at least the engine (102). The air may be guided towards other vehicle components such as battery unit, powertrain, etc. The vehicle frame structure (104) comprising a head tube (114); a main frame (116) extending rearwardly from the head tube (114), the main frame (116) capable of mounting a fuel tank assembly (118), a downtube (120) extending rearwardly and downwardly from the head tube (114). The engine (102) is mounted on the main frame (116), preferably the engine (102) is a single cylinder vertically mounted engine. The engine (102) comprises of a cylinder head (102a) joined with a cylinder block (102b) forming an airtight connection. A crankcase (102c) is provided below the cylinder block (102b) and includes vehicle transmission (102d). The vehicle includes a front fork (122) which is mounted on the vehicle frame structure (104). The front fork (122) is positioned at a forward portion of the vehicle frame structure (104), the front fork (122) being configured to rotatably support the front wheel (106) and to facilitate steering of the two- wheeled vehicle.

[0041]

[0037] Figs. 2a and 2b illustrate in detail about the air guide unit (112, 200) mounted on the fender assembly (110) as shown in Fig. 1. The air guide unit (200) comprises of a first surface (202) and a second surface (204), wherein a gap (206) is provided between the first surface (202) and the second surface (204), allowing the flow of air therebetween. The first surface (202) is relatively away from the fender assembly (110) compared with the second surface (204). The second surface (204) of the air guide unit (200) has a back side (208), wherein the back side (208) of the second surface (204) is configured to be mounted on the fender assembly (110) using mounting means (210). The first surface (202) and the second surface (204) are connected to form a single closed unit.

[0042]

[0038] Fig. 3 a illustrates the fender assembly (110, 300) mounted over the front wheel of the vehicle as viewed from side of the vehicle. The fender assembly (300) includes a fender (302) comprising plurality of downwardly extending portions (302a, 302b) on either side of the front wheel (106). As shown in Fig. 3c, the fender (302) is slidably mounted on the front fork (304). The fender (302) includes an inner side (302c), a front downwardly extending portion (302a) positioned forward of the front fork (304) and a rear downwardly extending portion (302b) positioned rearward of the front fork (304).

[0043]

[0039] Fig. 3b illustrates an exploded view of the fender assembly (300) and the pair of air guide units (200). The fender assembly (300) comprises of the fender (302) and a brace member (306), wherein the brace member (302) is positioned on the inner side (302c) of the fender (302). The pair of air guide units (200) are mounted on the front downwardly extending portions (302a) of the fender on either side of the front wheel (106). The brace member (306) includes two downward extensions (306a, 306b), located at front (306a) and rear (306b) of the front fork (304).

[0044]

[0040] The second surface back side of the air guide unit (208) is contoured to align with the side profile of the front fender (302) and the second surface (204) is mounted on the front fender (302) using fastening or mounting means (210). The first surface of the air guide unit (202) is angled (a) to form diversion with respect to the second surface (204) to guide the incoming airflow towards the engine (102). It’s design includes aerodynamic features to minimize drag while maximizing cooling efficiency. Preferably, the air guide unit (112, 200) may be oriented towards the engine (102) to facilitate maximum air flow.

[0045]

[0041] As shown in Fig. 3c, the rear downwardly extending portions (302b) of the fender and the brace rear extension (306b) are bolted together with the front fork (304). Similarly, the front downwardly extending portions (302a) of the fender and the brace front extension (306a) are bolted together with the front fork (304). Thereby, assuring a strong connection between the front fork (304) and the fender (302).

[0046]

[0042] Furthermore, the arrangement between the fender (302), the front fork (304), the brace member (306), and the air guide unit (200) is explained now in detail. The front downwardly extending portions (302a) of the fender forms a sandwich between the air guide unit (200) and the brace front extension (306a) of the brace member. The three components namely the air guide unit (200), the brace front extension (306a) and the front downwardly extending portions (302a) are fastened using mounting means (210). The detailed connection with the front fork is explained in details. The sandwich arrangement ensures a sturdy connection of the air guide unit (200) on the fender assembly (300). The brace member (306) provided at the inner side (302c) of the fender provides support to the structure of the fender (302).

[0047]

[0043] As illustrated in Fig. 3d, the front fork (304) includes a front fork connecting member (305) i.e. each of the front fork includes a front fork connecting member. Each of the front fork

[0048] (304) includes a front fork outer tube (304a) attached with the front fork connecting member

[0049] (305). The front fork connecting member (305) is configured to attach at least the air guide unit (200) and the fender assembly (300) onto the front fork (304). The front fork connecting member (305) is integrally formed on the front fork outer tube (304a).

[0050]

[0044] Referring to Fig. 3e, which shows a sectional view A-A of the Fig. 3d along with an exploded of the air guide unit (200). The front fork connecting member (305) comprises a front end (305a) and a rear end (305b), along the length of the vehicle. The front end (305a) positioned forward of the front fork (304) and the rear end (305b) positioned rearward of the front fork (304). Each of the front end (305a) of the front fork connecting member (305) is configured for fastening the front downwardly extending portion (302a) of the fender, and the air guide unit (112, 200). In an embodiment, each of the front end (305a) of the front fork connecting member (305) is configured for fastening the front downwardly extension portion (302a) of the fender, the front downward extension (306a) of the brace member (306) and the air guide (112, 200). Each of the rear end (305b) of the front fork connecting member (305) is configured for fastening the rear downwardly extension portion (302b) of the fender and the rear downward extension (306b) of the brace member (306). The fastening means (210), such as bolts, are employed for assembling of above-mentioned components into a sturdy unit or rigid connection. Since the front fork connecting member (305) forms an integral portion of the front fork (304), the overall arrangement provides structural enhancement to the fender assembly (300). This configuration imparts enhanced rigidity and strength to the fender assembly (300) and the air guide units (200), particularly when the two-wheeled vehicle operates at high speeds. The arrangement is symmetrically provided on both lateral sides of the fender (302), i.e., on the left-hand side and the right-hand side of the fender or wheel.

[0051]

[0045] Fig. 4 illustrates the air guide unit (200) arrangement with respect to the engine (102) as viewed from side of the vehicle. According to a preferred embodiment of the present invention, a top end (212) and a bottom end (214) of the air guide unit (200) lies within vertical limits (L) of the engine (102) such that the top end (212) reaches upto cylinder head (102a) of the engine (102), when viewed from the side of vehicle. The bottom end (214) reaches upto crankcase (102c) of the engine, when viewed from the side of the vehicle.

[0052]

[0046] Figs. 5a - 5b illustrates an isometric and front view of an air deflector assembly (402) for engine cooling for a two wheeled vehicle respectively, according to one of the embodiment of present invention. The engine cooling system (100) further comprises the air deflector assembly (402) rearward of the front fork tube (122) above the front wheel (106), wherein the air deflector assembly (402) comprises louvers (404) with plurality of opening (406) configured to direct ambient air towards the engine (102). A set of fuel tank covers (408) are provided on either side of the air deflector assembly (402) wherein the fuel tank covers (408) are mounted on the front and downward side of the fuel tank (118). The air deflector assembly (402) comprises of two deflector units (410), wherein each deflector unit (410) has an inner end (410a) and an outer end (410b). The inner end (410a) of each air deflector (410) is mounted on the downtube (120) of the vehicle frame and the outer end (410b) of each air deflector (410) is mounted on the fuel tank cover (408). The air deflector assembly (402) is positioned rearward of the front fork (122). The air deflector assembly (402) for ambient air cooling on a two-wheeler is having a two-part air deflector system, each part featuring diverging louvers (404) and apertures (412) on the top side, and the diverging louvers (404) and apertures (412) are configured to channel ambient air effectively towards the engine (102), thereby minimizing cooling blind spots.

[0053]

[0047] Figs. 6a - 6d illustrate ambient air flow over the engine (102) of the two wheeled vehicle viewed from side and top of the vehicle. Figs. 6a and 6c show flow of air without the engine cooling arrangement i.e. without the pair of air guide unit (112) and the deflector assembly (402) of the present invention. The air flow is unorganized and heated area formed around the engine affects the functioning of the engine (102). Whereas, in figs. 6b and 6d, flow of air with the engine cooling arrangement i.e. the pair of air guide unit (112) and the deflector assembly (402) are shown. The flow of air is organized and the cooling arrangement including the pair of air guide unit (112) and the deflector assembly (402) are designed to direct the air towards the engine and cool the heated area around the engine.

[0054]

[0048] The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics or essential characteristics. The described embodiments are to be considered in respects as illustrative and not restrictive.

[0055]

[0049] Although the exemplary forms of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the present disclosure.

[0056] List of Reference Numerals:

[0057] 100 - Engine cooling system

[0058] 102 - Engine

[0059] 102a - Cylinder head

[0060] 102b - Cylinder block

[0061] 102c - Crankcase

[0062] 102d - Transmission

[0063] 104 - Vehicle frame structure

[0064] 106 - Front wheel

[0065] 108 - Rear wheel

[0066] 110, 300 - Fender assembly 112, 200 - Air guide units

[0067] 114 - Head tube

[0068] 116 - Main frame

[0069] 118 - Fuel tank

[0070] 120 - Downtube

[0071] 122, 304 - Front fork

[0072] 202 - First surface of the air guide unit

[0073] 204 - Second surface of the air guide unit

[0074] 206 - Gap between the first surface and the second surface

[0075] 208 - Back side of the second surface of the air guide unit

[0076] 210 - Mounting means

[0077] 212 - Top end of the air guide unit

[0078] 214 - Bottom end of the air guide unit

[0079] 302 - Fender

[0080] 302a - Front downwardly extending portion of the fender

[0081] 302b - Rear downwardly extending portion of the fender

[0082] 302c - Inner side of the fender

[0083] 304a - Front fork outer tube

[0084] 305 - Front fork connecting member

[0085] 305a - Front end of Front fork connecting member

[0086] 305b - Rear end of Front fork connecting member

[0087] 306 - Brace member

[0088] 306a - Front downward extension of the brace member

[0089] 306b - Rear downward extension of the brace member

[0090] 402 - Air deflector assembly

[0091] 404 - Louvers

[0092] 406 - Opening in the louvers

[0093] 408 - Fuel tank cover

[0094] 410 - Deflector units

[0095] 410a - Inner end of the deflector unit

[0096] 410b - Outer end of the deflector unit

[0097] 412 - Aperture

Claims

We Claim1. An engine cooling system (100) for a two wheeled vehicle comprising: an engine (102) mounted on a vehicle frame structure (104); a pair of wheels including a front wheel (106) and a rear wheel (108); a fender assembly (110, 300) positioned over the front wheel (106); an air guide unit (112, 200) provided on each side of the front wheel (106) and configured to direct oncoming air towards at least the engine (102); a front fork (122, 304) disposed at a front portion of the vehicle frame structure (104) on either side of the front wheel (106), wherein each of the front fork (122, 304) includes a front fork connecting member (305); and wherein the front fork connecting member (305) is configured to attach at least the air guide unit (112, 200) and the fender assembly (110, 300).

2. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein each of the front fork (304) includes a front fork outer tube (304a) attached with the front fork connecting member (305).

3. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the fender assembly (110,300) includes a fender (302) comprising plurality of downwardly extending portions (302a, 302b) on either side of the front wheel (106) wherein; the downwardly extending portions (302a, 302b) includes a front downwardly extending portion (302a) positioned forward of the front fork (304) and a rear downwardly extending portion (302b) positioned rearward of the front fork (304).

4. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 3, wherein the front fork connecting member (305) includes a front end (305a) positioned forward of the front fork (304) and a rear end (305b) positioned rearward of the front fork (304) wherein; each of the front end (305a) of the front fork connecting member (305) is configured for fastening the front downwardly extending portion (302a) of the fender, and the air guide unit (112, 200).

5. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 4, wherein the fender assembly (110, 300) includes a brace member (306) positioned on an inner side (302c) of the fender (302); wherein the brace member (306) includes a frontdownward extension (306a) positioned forward of the front fork (304) and a rear downward extension (306b) positioned rearward of the front fork (304) on either side of the front wheel (106).

6. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 5, wherein each of the front end (305a) of the front fork connecting member (305) is configured for fastening the front downwardly extension portion (302a) of the fender, the front downward extension (306a) of the brace member (306) and the air guide unit (112, 200).

7. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 6, wherein each of the rear end (305b) of the front fork connecting member (305) is configured for fastening the rear downwardly extension portion (302b) of the fender and the rear downward extension (306b) of the brace member (306).

8. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the air guide unit (112, 200) comprises a first surface (202) and a second surface (204), connected to form a gap (206) for allowing the flow of air therebetween; wherein the first surface (202) is relatively away from the fender assembly (110, 300) as compared to the second surface (204).

9. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 8, wherein the second surface (204) of the air guide unit (200) configured to be mounted on the fender assembly (110, 300) using mounting means.

10. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 8, wherein the first surface (202) of the air guide unit (200) is angled to form diversion with respect to the second surface (204) to guide the incoming airflow towards at least the engine (102).

11. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 2, wherein each of the front fork connecting member (305) is integrally formed on the front fork outer tube (304a).

12. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the air guide unit (112, 200) vertical dimension lies within the vertical limits (L) of the engine (102) when viewed from side of the vehicle.

13. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the engine (102) is a vertically mounted single cylinder engine.

14. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the vehicle frame structure (104) comprising: a head tube (114); a main frame (116) extending rearwardly from the head tube (114); a downtube (120) extending rearwardly and downwardly from the head tube (114); and wherein the main frame (116) is capable of mounting a fuel tank (118) and the engine (102).

15. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 1, wherein the system (100) comprises an air deflector assembly (402) provided rearward of the front wheel (106) and ahead of the engine (102); wherein the air deflector assembly (402) is mounted above the front wheel (106) when viewed from front of the vehicle.

16. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 15, wherein the air deflector assembly (402) comprises louvers (404) with plurality of openings (406) configured to direct air towards at least the engine (102).

17. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 15, wherein the air deflector assembly (402) includes a set of fuel tank covers (408) provided on either side of the air deflector assembly (402) wherein the fuel tank covers (408) are mounted on the front and downward side of a fuel tank (118).

18. The engine cooling system (100) for the two wheeled vehicle as claimed in claim 17, wherein the air deflector assembly (402) comprises of two deflector units (410), wherein the each deflector unit (410) includes an inner end (410a) and an outer end (410b); wherein the inner end (410a) of the air deflector unit (402) is mounted on the downtube(120) of the vehicle frame and the outer end (410b) of each air deflector mounted on the fuel tank cover (408).

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