Description:FIELD OF THE INVENTION
[001] Present invention relates to an Internal Combustion (IC) engine. More particularly, the present invention relates to an air-cooling system for the IC engine.

BACKGROUND OF THE INVENTION
[002] It is a known fact that, a vehicle is provided with a prime mover, such as an Internal Combustion (IC) engine adapted to provide motive force required for driving the vehicle. Based on power requirements and type of the vehicle, capacity of the IC engine is typically considered. Generally, in the vehicle, such as a two-wheeled vehicle, an engine capacity of 110-125cc is considered. However, in certain two-wheeled vehicles, engine capacity of 150cc or above are considered for faster running conditions and/or for higher performance conditions.
[003] In IC engines having a capacity of 150cc or greater, a liquid cooling system is typically used for cooling the IC engine. The liquid cooling system ensures that the IC engine is operated in an optimal temperature range, thereby extracting optimum performance from the IC engine. However, liquid cooling system is accompanied by complex construction and also uses a liquid sump in a crankcase of the IC engine for circulating a liquid coolant within the liquid cooling system. Further, a pump is also required for pumping the liquid coolant throughout the IC engine in the liquid cooling system, consequently increasing the part count in the liquid cooling system and in the vehicle, thereby increasing the complexity of cooling system in the vehicle.
[004] To overcome the aforementioned limitations in the liquid cooling systems, a forced air-cooling system is typically employed for cooling the IC engine. The forced air-cooling system uses a cooling fan for cooling the IC engine. However, for higher capacity IC engines, diameter or size of the cooling fan is required to be increased or a plurality of cooling fans are required to be installed in the air-cooling system for ensuring adequate air circulation for cooling the IC engine, which further increases overall part count.
[005] Further, in conventional vehicles, a cooling passage extends from an inlet port to an outlet port, wherein the outlet port is generally disposed at a bottom portion of the IC engine, that is below the crankcase. Such a disposition of the outlet port is undesirable, as limited amount of hot air from the IC engine exits through the outlet port during vehicle running condition, while the remaining hot air circulates inside the cooling passage. Such a scenario leads to inefficient cooling of the IC engine, which is undesirable. Also, re-entry of the hot air into the cooling passage blocks the cooling passage for entry of cool air from the cooling fan. Additionally, use of plurality of fans in the air-cooling system is unfeasible due to space and layout constraint in the vehicle.
[006] In view of the above, there is a need for an air guiding system for an Internal Combustion engine, which addresses at least some of the limitations mentioned above.

SUMMARY OF THE INVENTION
[007] In one aspect, an air-cooling system for an Internal Combustion engine is provided. The air-cooling system comprises a first cowling disposed on a first side of the IC engine. The first cowling is adapted to route ambient air to the IC engine. A second cowling is disposed on a second side of the IC engine. The second cowling is adapted to discharge the air from the IC engine, wherein the first cowling is coupled with the second cowling.
[008] In an embodiment, the first cowling comprises a body member disposed on a first side of the IC engine and an intake cooling passage. The body member comprises an inlet port for receiving ambient air. The intake cooling passage is provided in the body portion and communicably coupled to the inlet port for receiving the ambient air. The intake cooling passage is adapted to route the ambient air to the IC engine for cooling. Further, the second cowling comprises a casing disposed on a second side of the IC engine and an outlet cooling passage. The casing comprises an outlet port. The outlet cooling passage is provided to the casing and communicably coupled to the outlet port. The outlet cooling passage is adapted to discharge air from the IC engine.
[009] In an embodiment, the intake cooling passage comprises a first portion adapted to extend towards a cylinder head and a cylinder block of the IC engine. The first portion is adapted to route the ambient air to the cylinder head and the cylinder block. A second portion extends from the first portion and towards a crankcase of the IC engine. The second portion is adapted to route the ambient air to the crankcase for cooling.
[010] In an embodiment, the first portion is configured in an S-shaped profile. The first portion also comprises a recessed portion for diverting ambient air between the cylinder head and the cylinder block.
[011] In an embodiment, the first portion comprises a concave top surface for diverting ambient air towards the cylinder head.
[012] In an embodiment, the first portion comprises a bottom surface about a longitudinal axis of the IC engine. The bottom surface is oriented towards the concave top surface for preventing stagnation of the ambient air routed towards the cylinder head.
[013] In an embodiment, the second portion is provided with a box-shaped profile for enabling routing of the ambient air around the crankcase of the IC engine.
[014] In an embodiment, the first portion and the second portion are integrated to form an interface portion.
[015] In an embodiment, the second cowling is adapted to engage with the interface portion for coupling with the first cowling.
[016] In an embodiment, the outlet port is provided on one of side surfaces of the casing.
[017] In an embodiment, the second cowling being provided with a deflector. The deflector is provided on an outer surface of the casing, wherein the deflector is adapted to direct the air from the at least one of cylinder head and the cylinder block towards the outlet port.
[018] In an embodiment, the first side corresponds to a left side of the IC engine and the second side corresponds to a right side of the IC engine about a longitudinal axis of the IC engine.
[019] In an embodiment, the air-cooling system comprises a cover mounted onto a shroud portion of the body member, The cover is adapted to enclose a fan within the shroud portion.
[020] In an embodiment, the air-cooling system comprises a fan disposed within the first cowling, wherein the fan being adapted to draw in the ambient air into the intake cooling passage through the inlet port.
[021] In an embodiment, the body member comprises a shroud portion positioned adjacently to the inlet port, wherein the shroud portion being adapted to conform with a profile of the fan.

BREIF DESCRIPTION OF ACCOMAPNYING DRAWINGS
[022] Reference will be made to embodiments of the invention, examples of which may be illustrated in accompanying figures. These figures are intended to be illustrative, not limiting. Although the invention is generally described in context of these embodiments, it should be understood that it is not intended to limit the scope of the invention to these particular embodiments.
Figure 1 is a sectional view of an Internal Combustion (IC) engine comprising an air guiding structure, in accordance with an exemplary embodiment of the present invention.
Figure 2 is a perspective view of a first cowling of the air guiding structure, in accordance with an exemplary embodiment of the present invention.
Figure 3 is a side view of the first cowling of the air guiding structure, in accordance with an exemplary embodiment of the present invention.
Figure 4 is a perspective view of a cover mounted to the first cowling, in accordance with an exemplary embodiment of the present invention.
Figure 5 is a side perspective view of a second cowling of the air guiding structure, in accordance with an exemplary embodiment of the present invention.
Figure 6 is a front perspective view of the second cowling, in accordance with an exemplary embodiment of the present invention.
Figure 7 is a rear perspective view of the second cowling, in accordance with an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION
[023] The present invention relates to an Internal Combustion (IC) engine. More particularly, the present invention relates to an air guiding structure for the IC engine. The air guiding structure is adapted to minimize the part count in the IC engine, while ensuring effective and efficient cooling of the IC engine.
[024] In the present disclosure, arrow indications provided in Figure 1 pertain to directional indications of the IC engine. As such, the terms “top side”, “bottom side”, “left side” and “right side” respectively correspond to top, bottom, left and right sides of the IC engine, until and unless specified otherwise.
[025] Figure 1 is a sectional view of an Internal Combustion (IC) engine 102, in accordance with an exemplary embodiment of the present invention. The IC engine 102 is capable of being mounted onto a vehicle such as a two-wheeled vehicle, a three-wheeled vehicle or a multi-wheeled vehicle as per requirement. The IC engine 102 is capable of generating motive force required for driving the vehicle. In an embodiment, the IC engine 102 is a spark-ignition engine or a compression-ignition engine.
[026] The IC engine 102 comprises a cylinder head 124 mounted onto a cylinder block 126. In an embodiment, the cylinder head 124 may be fastened onto the cylinder block 126. The cylinder head 124 comprises a camshaft assembly (not shown) coupled to an intake port (not shown) and an exhaust port (not shown) through an intake valve assembly (not shown) and an exhaust valve assembly (not shown) respectively. The cylinder block 126 comprises a combustion chamber (not shown) disposed with a piston 146 and a connecting rod 148. The combustion chamber is adapted to receive a mixture of a fuel and air or air through the intake port. Subsequently, the fuel-air mixture or the air is compressed by the piston 146. The compressed fuel-air mixture is ignited through a spark plug or the air is ignited by injection of fuel into the combustion chamber, thereby generating power within the IC engine 102. The power generated in the combustion chamber drives the piston 146 and the connecting rod 148. The connecting rod 148 in-turn drives a crankshaft 150 disposed within a crankcase 130 that is positioned below the cylinder block 126. Further, an air guiding system 100 is mounted onto the IC engine 102. The air guiding system 100 is adapted to guide ambient air to the IC engine 102 for cooling, thereby ensuring operation of the IC engine 102 under optimal temperature conditions. In an embodiment, the term “optimal temperature conditions” corresponds to a temperature conditions or range for effective and efficient operation of the IC engine 102.
[027] The air guiding system 100 comprises a first cowling 104 disposed on a first side 102a of the IC engine 102. In an embodiment, the first cowling 104 is mounted onto the first side 102a of the IC engine 102 through conventional mounting techniques known in the art such as a fastening technique, a snap-fitting technique and the like. In an embodiment, the first side 102a corresponds to a right side of the IC engine 102. Alternatively, the first side 102a can be a left side or a front side or a rear side of the IC engine 102 as per design feasibility and requirement of the air guiding system 100. Further, the air guiding system 100 comprises a second cowling 112 disposed on a second side 102b of the IC engine 102. In an embodiment, the second cowling 112 is mounted onto the second side 102b of the IC engine 102 through conventional mounting techniques known in the art such as the fastening technique, the snap-fitting technique and the like. In an embodiment, the first side 102a corresponds to the left side of the IC engine 102. In other words, the second side 102b is preferably a side opposite to the first side 102a of the IC engine 102. Alternatively, the second side 102b can be a left side or a front side or a rear side of the IC engine 102 as per design feasibility and requirement of the air guiding system 100.
[028] Referring to Figures 2 and 3 in conjunction with Figure 1, the first cowling 104 of the air-cooling system 100 is depicted. The first cowling 104 is adapted to route ambient air to the IC engine 102. The first cowling 104 comprises a body member 106 disposed on the first side 102a of the IC engine 102. The body member 106 is mounted on the first side 102a of the IC engine 102 through conventional mounting techniques known in the art such as the fastening technique, the snap-fitting technique and the like. In an embodiment, a plurality of mounting members 152 are provided along a peripheral surface (not shown) of the body portion 106. Each of the plurality of mounting member 152 is capable of receiving a fastener (not shown) for fastening the body member 106 onto the first side 102a, thereby mounting the first cowling 104 onto the IC engine 102.
[029] An inlet port 108 is provided proximally to a first end 106a of the body member 106 for receiving the ambient air. The inlet port 108 may be circular in shape. Alternatively, shape of the inlet port 108 may be considered as per design feasibility and requirement of the first cowling 104. Also, size or dimensions of the inlet port 108 is selected as per air circulation requirement to IC engine 102. In an embodiment, the inlet port 108 is an opening provided proximal to the first end 106a of the body member 106.
[030] In an embodiment, a fan 140 (as shown in Figure 1) is disposed in the first cowling 104. The fan 140 is adapted to draw in the ambient air into the first cowling 104 through the inlet port 108. In an embodiment, the fan 140 is mounted adjacently to the inlet port 108 along a left-right direction of the IC engine 102, for drawing in air into the first cowling 104 through the inlet port 108. In an embodiment, the shape and profile of the fan 140 are considered as per design feasibility and requirement of air circulation to the IC engine 102. In an embodiment, a height of the fan 140 is 6-8mm, while a diameter of the fan is 130-138mm for the IC engine 102 having a capacity of 150cc.
[031] In an embodiment, a shroud portion 120 is provided adjacently to the inlet port 108 along the left-right direction of the IC engine. The shroud portion 120 may be a cylindrical member provided proximally to the first end 106a and extending inwardly or towards from the IC engine 102 along the left-right direction of the IC engine 102. As such, the inlet port 108 is also oriented away from the IC engine 102 for ease of drawing in the ambient air into the air guiding system 100. The shroud portion 120 is adapted to support the fan 140 and conforms to the profile of the fan 140. One or more support members 154 (shown in Figure 2) are provided along an inner surface (not shown) of the shroud portion 120. Each of the one or more support members 154 are adapted to engage with a periphery (not shown) of the fan 140, thereby ensuring a rigid mounting of the fan 140 onto the shroud portion 120. In an embodiment, the one or more support members 154 engage with the fan 140 through conventional mounting techniques known in the art such as the fastening technique, the snap-fitting technique and the like. In an embodiment, the shroud portion 120 establishes an offset profile or a protruded profile to the first cowling 104, so that the fan 140 is accommodated within the first cowling 104 and positioned adjacently to the crankcase 130 of the IC engine 102. In an embodiment, dimensions of the shroud portion 120 are selected as per dimensions and profile of the fan 140 and/or as per design feasibility of the air guiding system 100 in the IC engine 102.
[032] In an embodiment, the fan 140 may be communicably coupled to a control unit (not shown) such as an Electronic Control Unit (ECU) (not shown) of the vehicle and a battery module (not shown). The control unit is adapted to operate the fan 140 selectively for drawing in the ambient air into the first cowling 104 based on cooling requirements of the IC engine 102, during a vehicle running operation.
[033] Referring to Figure 4 in conjunction with Figures 2 and 3, a cover 138 capable of being mounted onto the shroud portion 120 is depicted. The cover 138 acts as a cap member for the fan 140 and is thus adapted to enclose the fan 140 within the shroud portion 120. The cover 138 comprises a sleeve 156 mounted onto a rim surface 104a of the first cowling 104. One or more mountings 158 are provided along a periphery of the sleeve 156. Each of the one or more mountings 158 are adapted to engage onto the rim surface 104a of the first cowling 104 for mounting the cover 138 onto the shroud portion 120. In an embodiment, the one or more mountings 158 engage with the rim surface 104a through conventional mounting techniques known in the art such as the fastening technique, the snap-fitting technique and the like.
[034] Further, a mouth portion 160 extends outwardly from the sleeve 156 of the cover 138. The mouth portion 160 is adapted to direct or guide the ambient air from the surroundings to the inlet port 108. In an embodiment, size and profile of the mouth portion 160 corresponds to the inlet port 108, for ease of directing or guiding the ambient air to the inlet port 108. The mouth portion 160 extends outwardly with a tapered rim construction having a larger rim portion 160a and a smaller rim portion 160b. The mouth portion 160 is positioned such that the larger rim portion 160a is positioned towards a rear side (not shown) of the IC engine 102, while the smaller rim portion 160b is positioned towards a front side (not shown) of the IC engine 102. Such a disposition and construction of the mouth portion 160 ensures that ram air around the IC engine 102 is guided by the mouth portion 160 to the inlet port 108 during movement of the vehicle, thereby enhancing cooling performance of the air guiding system 100. Further, at a lower end (not shown) of the mouth portion 160, the cover 138 is provided with a webbing 162. The webbing 162 is adapted to provide ingress protection to the air guiding system 100.
[035] Referring back to Figure 3, the body member 106 comprises an intake cooling passage 110 that is communicably coupled to the inlet port 108. The intake cooling passage 110 is adapted to route the ambient air received by the inlet port 108 to the IC engine 102. In an embodiment, the intake cooling passage 110 is a passage or a channel extending along a longitudinal axis A-A’ (shown in Figure 1) from the first end 106a of the body portion 106. In an embodiment, the intake cooling passage 110 extends forwardly and upwardly to the IC engine 102 along the longitudinal axis A-A’. Such a construction ensures that the ambient air reaches the entirety of the IC engine 102, thereby enhancing cooling performance of the air-cooling system 100. In an embodiment, the intake cooling passage 110 extends from a peripheral surface (not shown) of the shroud portion 120. In an embodiment, a cutout (not shown) is provided on the shroud portion 120 for enabling flow of the ambient air into the intake cooling passage 110 that is drawn through the inlet port 108.
[036] Further, the intake cooling passage 110 comprises a first portion 122 that extends towards the cylinder head 124 and the cylinder block 126 of the IC engine 102. As such, the first portion 122 is adapted to route the ambient air from the inlet port 108 to the cylinder head and the cylinder block 126. In an embodiment, the first portion 122 extends upwardly and forwardly along the longitudinal axis A-A’ (as shown in Figure 1) for surrounding the cylinder head 124 and the cylinder block 126 on the first side 102a of the IC engine 102. The first portion 122 comprises a top surface 134, a bottom surface 144 and side walls 164 connecting the top surface 134 and the bottom surface 144. The top surface 134, the bottom surface 144 and the side walls 164 form a tubular channel for enabling flow of the ambient air to the IC engine 102 from the inlet port 108. In an embodiment, the first portion 122 is configured with an S-shaped profile along the longitudinal axis A-A’ (as shown in Figure 1).
[037] In an embodiment, the top surface 134 is a concave top surface 134. The term “concave top surface” corresponds to concave curvature of the top surface 134 (as shown in Figure 1) towards the cylinder head 124. The concave top surface 134 is adapted to divert the ambient air towards the cylinder head 124. In an embodiment, the curvature of the top surface 134 is selected as per flow requirements to the cylinder head 124. Further, the bottom surface 144 is oriented towards the top surface 134 (about a longitudinal axis A-A’). Such a construction narrows the passage in the first portion 122, thereby preventing stagnation of the ambient air routed towards the cylinder head 124. In an embodiment, orientation of the bottom surface 144 is selected based on flow requirements in the first portion 122.
[038] In an embodiment, a recessed portion 132 is provided on the first portion 122. The recessed portion 132 extends along the first portion 122 for diverting the ambient air between the cylinder head 124 and the cylinder block 126. As such, the ambient air routed into the first portion 104 is divided to surround both the cylinder head 124 and the cylinder block 126 for cooling. In an embodiment, the depth of the recessed portion 132 is selected as per flow requirements in the first portion 104 and also on the ambient air that is to be diverted between the cylinder head 124 and the cylinder block 126.
[039] Furthermore, the intake cooling passage 110 comprises a second portion 128 extending from the first portion 122 and towards the crankcase 130. The second portion 128 is adapted to surround the crankcase 130. The second portion 128 is adapted to route the ambient air to the crankcase 130 for cooling. The second portion 128 also comprises an upper surface 166, a lower surface 168, a left side surface 170a and a right side surface 170b. The left side surface 170a and the right side surface 170b extends divergently from the first portion 122, wherein the left side surface 170a extends towards the cylinder head 124, while the right side surface 170b extends towards the crankcase 130. Accordingly, the second portion 128 is adapted to surround the first side 102a of the IC engine 102. In other words, the second portion 128 is adapted to surround the cylinder head 124, the cylinder block 126 and the crankcase 130 on the first side 102a of the IC engine 102.
[040] In an embodiment, the second portion 128 is provided with a box-shaped profile or a rectangular profile for enabling routing of the ambient air around the crankcase 130 of the IC engine 102. Alternatively, the second portion 128 may be configured with a profile as per construction of the IC engine 102.
[041] In an embodiment, the first portion 122 and the second portion 128 are integrated to form an interface portion 136. The term “interface portion” refers to a junction portion between the first portion 122 and the second portion 128. In an embodiment, the second portion 128 is mounted to the first portion 122 through conventional mounting techniques such as a welding technique, a brazing technique and the like. As such, the first portion 122 and the second portion 128 may be integrally manufactured or may be joined with one another to form the intake cooling passage 110. In an embodiment, the second portion 128 is coupled with the first portion 122 through conventional coupling known in the art such as a welding technique, a brazing technique and the like.
[042] In an embodiment, each of the left side surface 170a and the right side surface 170b comprises an outer rim surface 128a that conforms to contours on the cylinder head 124, the cylinder block 126 and the crankcase 130. As such, upon mounting of the first cowling 104, a flush configuration is established between the second portion 128 and the crankcase 130. Accordingly, the leakage of the ambient air while circulating within the first cowling 104 is mitigated.
[043] Referring to Figures 5-7 in conjunction with Figures 1-4, the second cowling 112 capable of being mounted to the second side 102b of the IC engine is depicted. The second cowling 112 is adapted to discharge the air routed to the IC engine 102. Thus, the second cowling 112 acts as a discharge unit for the air-cooling system 100. The second cowling 112 is coupled to the first cowling 104 for receiving the air upon circulation around the IC engine 102. In an embodiment, the second cowling 112 comprises an inlet opening 182 that is coupled to a discharge opening 180 (shown in Figures 2 and 3) for receiving the air from the first cowling 104.
[044] The second cowling 112 comprises a casing 114 that is capable of being disposed on the second side of the IC engine 102. The casing 114 comprises an outer surface 172 and side surfaces 174 having a left side surface 174a and a right side surface 174b. The outer surface 172, the left side surface 174a and the right side surface 174b form an outlet cooling passage 118. The outlet cooling passage 118 is communicably coupled to the inlet cooling passage 110 through the discharge opening 180. As such, the air (or hot air) discharged from the inlet cooling passage 110 upon circulation around the IC engine 102 is routed through the outlet cooling passage 118. The outlet cooling passage 118 is communicably coupled to an outlet port 116. The outlet port is adapted to discharge the air from the IC engine 102 to the surroundings. The air entering the outlet cooling passage 118 is hot air that has extracted heat from the IC engine 102. In an embodiment, outer surface 172, the left side surface 174a and the right side surface 174b form a U-shaped cross-section of the outlet cooling passage 118.
[045] In an embodiment, one or more mounting units 176 are provided on at least one of the outer surface 172, the left side surface 174a and the right side surface 174b. Each of the one or more mounting units 176 is adapted to engage with the second side 102b of the IC engine 102. In an embodiment, each of the one or more mounting units 176 engage with the second side 102b of the IC engine 102 through conventional mounting techniques known in the art such as the fastening technique, the snap-fitting technique and the like.
[046] In an embodiment, the outlet port 116 extends from the outer surface 172 to the left side surface 174a. Thus, the outlet port 116 is positioned outwardly to the IC engine 102. Such a disposition ensures that the outlet port 116 discharges the air outwardly to the IC engine 102, thereby mitigating re-entry of air into the outlet cooling passage 118. In an embodiment, a deflector 142 is provided to the second cowling 112. The deflector 142 is adapted to direct the air from at least one of the cylinder head 124, the cylinder block 126 and the crankcase 130 to the outlet port 116. In an embodiment, the deflector 142 is provided to an inner surface (not shown) of the outer surface 172 of the casing 114. In an embodiment, the deflector 142 may be a plate like member mounted to the inner surface of the outer surface 172 for directing air to the outlet port 116.
[047] In an embodiment, a locking unit 178 is provided on the second cowling 112. The locking unit 178 is adapted to engage with the first cowling 104, thereby enabling coupling or engagement between the first cowling 104 and the second cowling 112. In an embodiment, the locking unit 178 is adapted to engage with a locking member (not shown) provided on the body member 106 of the first cowling 104 for enabling coupling between the first cowling 104 and the second cowling 112. In an embodiment, the locking unit 178 is provided on the outer surface 172 of the casing 114. Alternatively, the locking unit 178 may be provided on the left side surface 174a or the right side surface 174b corresponding to the position of the locking member on the first cowling 104. In an embodiment, the locking unit 178 comprises an eye portion 178a (shown in Figure 5) that is adapted to engage with the locking member, thereby enabling coupling between the first cowling 104 and the second cowling 112.
[048] In an operational embodiment, the ambient air enters the inlet port 108 and into the intake cooling passage 110. In an embodiment, air enters the inlet port 108 due to suction induced in the intake cooling passage 110 due to temperature of the IC engine 102. In another embodiment, air enters the inlet port 108 due to suction induced by operation of the fan 140. The fan 140 may be operated by the control unit of the vehicle based on cooling requirements of the IC engine 102. The intake cooling passage 110 diverts a portion of the ambient air to the cylinder head 124, the cylinder block 126 and the crankcase 130. The ambient air surrounds and extracts heat from the cylinder head 124, the cylinder block 126 and the crankcase 130, thereby cooling the IC engine 102. Subsequently, the air (i.e. the hot air) is routed to the outlet cooling passage 118. The air routed to the outlet cooling passage 118 is discharged from the IC engine 102 through the outlet port 108 to the surroundings.
[049] The claimed invention as disclosed above is not routine, conventional, or well understood in the art, as the claimed aspects enable the following solutions to the existing problems in conventional technologies. Specifically, the claimed aspect of providing the air guiding system comprising the first cowling mounted on the first side of the IC engine and the second cowling mounted on the second side of the IC engine mitigates re-entry of air discharged from the outlet port, thereby ensuring effective flow of ambient air into the air guiding system for cooling the IC engine. Particularly, the first cowling mounted on the right side of the IC engine and the second cowling mounted on the left side of the IC engine mitigates re-entry of air discharged from the outlet port, thereby ensuring effective flow of ambient air into the air guiding system for cooling the IC engine. Additionally, the air guiding system minimizes the number of parts, thereby ensuring effective utilization and optimization of the space around the IC engine and in the vehicle in which the IC engine is mounted. Further, due to effective inflow of ambient air into the air guiding system, the IC engine is efficiently cooled, thereby ensuring optimal performance from the IC engine. Efficient and effective cooling of the IC engine results in reduction in engine oil temperature and also engine oil consumption, consequently reducing maintenance costs associated with the IC engine. Moreover, due to the limited number of the parts in the air guiding system, a compact system is provided for the IC engine, even for higher capacity engines having the engine capacity of 150cc or more.
[050] Further, due to the construction of the air-guiding system and the geometry of the fan, there is an increase in air flow by 15-18% around the IC engine resulting in decrease of temperature by 2-5% (from 150 degree Celsius to 137 degrees Celsius in one embodiment) as compared to conventional 150cc IC engines. Also, the air-guiding system ensures to maintain an oil temperature of the IC engine between 100-130 degrees, which is optimum for effective cooling of the IC engine. Additionally, the S-shaped profile of first portion provides about 25-30% increased air flow to the cylinder block and the spark plug of the IC engine, than the conventional IC engines.
[051] While the present invention has been described with respect to certain embodiments, it will be apparent to those skilled in the art that various changes and modification may be made without departing from the scope of the invention as defined in the following claims.

Reference Numerals and Characters
100 – Air-cooling system
102 – Internal Combustion (IC) engine
102a – First side of the IC engine
102b – Second side of the IC engine
104 – First cowling
106 – Body member
108 – Inlet port
110 – Intake cooling passage
112 – Second cowling
114 – Casing
116 – Outlet port
118 – Outlet cooling passage
120 – Shroud portion
122 – First portion
124 – Cylinder head
126 – Cylinder block
128 – Second portion
130 – Crankcase
132 – Recessed portion
134 – Concave top surface
136 – Interface portion
138 – Cover
140 – Fan
142 – Deflector
144 – Bottom surface
146 – Piston
148 – Connecting rod
150 – Crankshaft
152 – Plurality of mounting members
154 – One or more support members
156 – Sleeve
158 – One or more mountings
160 – Mouth portion
162 – Webbing
164 – Side walls
166 – Upper surface
168 – Lower surface
170a – Left side surface
170b – Right side surface
172 – Outer surface of the casing
174 – Side surfaces of the casing
174a – left side surface of the casing
174b – Right side surface of the casing
176 – One or more mounting units
178 – Locking unit
180 – Discharge opening
182 – Inlet opening

, Claims:1. An air-cooling system (100) for an Internal Combustion (IC) engine (102), the air-cooling system (100) comprising:
a first cowling (104) disposed on a first side (102a) of the IC engine (102), the first cowling (104) being adapted to route ambient air to the IC engine (102); and
a second cowling (112) disposed on a second side (102b) of the IC engine (102), the second cowling (112) being adapted to discharge the air from the IC engine (102),
wherein the first cowling (104) is coupled with the second cowling (112).

2. The air-cooling system (100) as claimed in claim 1, wherein
the first cowling (104) comprises:
a body member (106) disposed on a first side (102a) of the IC engine (102), the body member (106) comprising an inlet port (108) for receiving ambient air; and
an intake cooling passage (110) provided in the body portion (106) and being communicably coupled to the inlet port (108) for receiving the ambient air, the intake cooling passage (110) being adapted to route the ambient air to the IC engine (102) for cooling; and
the second cowling (112) is coupled to the first cowling (104), the second cowling (112) comprising:
a casing (114) disposed on a second side (102b) of the IC engine (102), the casing (114) comprising an outlet port (116); and
an outlet cooling passage (118) provided to the casing (114) and being communicably coupled to the outlet port (116), the outlet cooling passage (118) being adapted to discharge air from the IC engine (102).

3. The air-cooling system (100) as claimed in claim 2, wherein the intake cooling passage (110) comprises:
a first portion (122) adapted to extend towards a cylinder head (124) and a cylinder block (126) of the IC engine (102), the first portion (122) being adapted to route the ambient air to the cylinder head (124) and the cylinder block (126); and
a second portion (128) extending from the first portion (122) and towards a crankcase (130) of the IC engine (102), the second portion (128) being adapted to route the ambient air to the crankcase (130) for cooling.

4. The air-cooling system (100) as claimed in claim 3, wherein the first portion (122) configured in an S-shaped profile, the first portion (122) comprising a recessed portion (132) for diverting ambient air between the cylinder head (124) and the cylinder block (126).

5. The air-cooling system (100) as claimed in claim 3, wherein the first portion (122) comprises a concave top surface (134) for diverting ambient air towards the cylinder head (124).

6. The air-cooling system (100) as claimed in claim 3, wherein the first portion (122) comprises a bottom surface (144) about a longitudinal axis (A-A’) of the IC engine (102), the bottom surface (144) being oriented towards the concave top surface (134) for preventing stagnation of the ambient air routed towards the cylinder head (124).

7. The air-cooling system (100) as claimed in claim 3, wherein the second portion (128) is provided with a box-shaped profile for enabling routing of the ambient air around the crankcase (130) of the IC engine (102).

8. The air-cooling system (100) as claimed in claim 3, wherein the first portion (122) and the second portion (128) are integrated to form an interface portion (136).

9. The air-cooling system (100) as claimed in claim 8, wherein the second cowling (112) is adapted to engage with the interface portion (136) for coupling with the first cowling (104).

10. The air-cooling system (100) as claimed in claim 1, wherein the outlet port (116) is provided on one of side surfaces (174) of the casing (114).

11. The air-cooling system (100) as claimed in claim 1, wherein the second cowling (112) being provided with a deflector (142), the deflector (142) being provided on an outer surface (172) of the casing (114), wherein the deflector (142) being adapted to direct the air from at least one of a cylinder head (124), a cylinder block (126) and a crankcase (130) towards the outlet port (116).

12. The air-cooling system (100) as claimed in claim 1, wherein the first side (102a) corresponds to a left side of the IC engine (102), and the second side (102b) corresponds to a right side of the IC engine (102) about a longitudinal axis (A-A’) of the IC engine (102).

13. The air-cooling system (100) as claimed in claim 2 comprises a cover (138) mounted onto a shroud portion (120) of the body member (106), the cover (138) being adapted to enclose a fan (140) within the shroud portion (120).

14. The air-cooling system (100) as claimed in claim 1 comprises a fan (140), the fan (140) being disposed within the first cowling (104), wherein the fan (140) being adapted to draw in the ambient air into the intake cooling passage (110) through the inlet port (108).

15. The air-cooling system (100) as claimed in claim 14, wherein the body member (106) comprises a shroud portion (120) positioned adjacently to the inlet port (108), the shroud portion (120) being adapted to conform with a profile of the fan (140).