Description:Technical Field
[0001] The present subject matter relates to motor vehicles. More specifically, the present subject matter relates to cooling arrangement for a power unit of a motor vehicle.
Background
[0002] A vehicle layout design for a saddle ride type vehicle features a plurality of vehicular components that are to be packaged in a compact space. Packaging more components leads to increasing the vehicle’s weight, and width. The width increases as modifying the vehicle chassis is a very difficult and cumbersome process, and it is not possible to modify the chassis of a vehicle for every new component to be added. Generally, saddle type vehicles consist of a frame, a power unit and a plurality of body panels covering the parts disposed in the vehicle. The frame can be a step through frame. The vehicle has a front wheel and a rear wheel, the rear wheel being the driven wheel. The front wheel is attached to the front of the vehicle frame and the steering through the headtube. The rear wheel is attached to a swingarm mounted on the frame. The swingarm is attached to a second mounting point on the frame through the rear suspension. The majority of the components that are needed to run the vehicle are also disposed on the rear part of the vehicle. This includes the power unit and the transmission system, which are usually mounted on the swingarm of the saddle type vehicle.
[0003] The power unit can be an internal combustion (IC) engine or an electric motor. An IC engine has a combustion chamber where a mixture of air and fuel is burned in a pressurized environment to force a piston to undergo a linear motion, which is then transformed into rotational motion in the crankshaft. This rotational motion of the crankshaft is then transmitted to the driven wheel, which is the rear wheel of the vehicle, through the transmission system. The transmission system is generally either a manual transmission system or a continuously variable transmission system.
[0004] The power unit needs to be cooled as it generates a lot of heat while it is delivering the power to drive the wheels. Generally, the power unit is usually cooled with an air-cooling system or a liquid cooling system. Power units with smaller capacity IC engines usually employ an air-cooling system wherein the outer body of the engine is configured with metallic fins, which disperse of the excess heat generated by the engine into the atmosphere as air passes over them while the vehicle is moving. A liquid cooling system is one where a liquid coolant is artificially cooled and then pumped into a cooling circuit to absorb the heat being generated by the engine.
[0005] Packaging all of the components that are required to run a saddle type vehicle into the compact vehicle structure without significantly increasing its dimensions is an uphill challenge. A saddle type two wheeled vehicle with a step through frame has a further challenge to accommodate these components, as a sizeable portion of the vehicle’s structure is left vacant for better ergonomics and comfort of the rider.
[0006] The cooling system for the power unit can be an air cooled system or a liquid cooled system. In a liquid cooled system, a coolant is pumped into the cooling circuit using a coolant pump. The cooling circuit may be built into the power unit, or it may be built over the heat generating components of the power unit. Since the power unit is built out of metal, and metals generally being good conductors of heat, the dissipation of heat from the power unit to the coolant liquid is an efficient method of cooling the power unit. The coolant pump may be driven by an electric motor, or it may be driven by the crankshaft of the power unit.
[0007] The coolant liquid is cooled by passing the liquid through a radiator assembly. The radiator assembly typically consists of a radiator and a fan. The fan forces air through the coolant liquid cooling the liquid. The radiator is a specially made heat exchange device used to transfer thermal energy from one medium to another. The hot coolant from the power unit is pumped into the inlet tank (through the inlet hose) of the radiator, from which it is distributed across the radiator core through tubes to another tank on the opposite end (the outlet end) of the radiator. As the coolant passes through the tubes to the outlet end, it transfers much of its heat to the fins that are disposed between the tubes. Fins are used to greatly increase the contact surface of the tubes to the ambient atmosphere. This cools the coolant liquid. In saddle type vehicles without a step through frame, where the liquid cooled power unit is mounted and supported by the frame in a forward portion of the frame structure, the radiator is disposed at a forwardmost position so that fresh air passes through the radiator fins and tubes directly as it moves along. A fan may not be required in such situations, depending upon the requirements of the engine.
[0008] However, in saddle type vehicles with a step through frame, where the power unit is mounted on the rear swingarm, the front portion of the vehicle is usually covered in body panels for ergonomic and aerodynamic reasons. In such arrangements, the radiator cannot be placed at a position where it is facing the incoming wind when the vehicle is moving forward. In order to effectively cool the coolant liquid, air has to be forced into the radiator. This is achieved by the fan that is mounted on the radiator.
[0009] As mentioned earlier, the fan may be driven by an electric motor or by the crankshaft’s rotation. If the radiator sub-assembly is to be mounted such that the fan is driven by the crankshaft, the radiator sub-assembly has to be mounted beside the crankcase of the IC engine, such that the crankshaft and the shaft of the fan are in alignment on the same axis. Further, the radiator also has to be mounted on the same axis so that the fan can drive air through the radiator. This arrangement increases the width of the power unit. This causes packaging issues at the rear of the vehicle wherein the bodywork has to be fared broader and wider to accommodate the extra width of the radiator sub-assembly.
[0010] Also, in a typical liquid cooling system, the cooling is turned on only when the engine temperature crosses a threshold level. This is done because when the vehicle is moving, some heat dissipation to the ambient air takes place even though the power unit is not designed to be air cooled. The cooling system is required only when the ambient atmosphere cannot cool the power unit fast enough. The fan shaft being axially aligned and connected to the crankshaft means that the fan rotates even when the cooling system is not required. This results in a waste of energy being produced by the power unit, and less power being delivered to the driven wheel, because some amount of work is always being done to drive the fan.
Summary of the Invention
[0011] This summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described below, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
[0012] In order to address the above mentioned problems, the present subject matter discloses a mounting location of a cooling assembly.
[0013] In an aspect, a cooling assembly for a power unit of a vehicle is disclosed. The cooling assembly comprises a radiator, a cooling pump, and a fan. The cooling pump is mounted on a right-hand side of the power unit in a vehicle front rear direction. The fan is mounted on the radiator. The radiator and the fan are assembled together to form a cooling sub-assembly. The cooling sub-assembly is disposed obliquely at a forward portion of the power unit, on a right-hand side of the cylinder head and a front portion of a crankcase, when viewed from a vehicle front rear direction.
[0014] In an embodiment, the cooling assembly further includes an inlet hose and an outlet hose, the inlet hose is connected to the radiator at a forward portion of the radiator in a vehicle front rear direction, the outlet hose is connected to the radiator at a rearward portion of the radiator in the vehicle front rear direction.
[0015] In an embodiment, the radiator and the fan are mounted to the power unit by one or more radiator mounting brackets.
[0016] In an embodiment, a first radiator mounting bracket is ahead of the cooling pump in a vehicle front rear direction.
[0017] In an embodiment, the fan is enclosed by a shroud.
[0018] In an embodiment, the fan is configured to be actuated when a temperature of the power unit is above a threshold value.
[0019] In an embodiment, the fan is disposed towards the power unit, and the radiator is disposed outwards from the power unit.
[0020] In an embodiment, the fan is disposed in a triangular space when viewed from a top perspective view of the power unit, the triangular space is defined by the cylinder head, a crankcase and the radiator.
[0021] In an embodiment, a cooling pump is driven by a shaft, the shaft being connected to a crankshaft of the power unit, the crankshaft being rotatably disposed in the crankcase.
[0022] In an embodiment, the cooling sub-assembly is disposed at an angle of 25 – 45 degrees with respect to an imaginary axis (A-A’) passing through a cooling pump.
[0023] In an embodiment, the fan being mounted on the radiator in a space defined by an outer boundary of the cylinder head, an outer boundary of a crankcase, and an outer boundary of the radiator.
[0024] In an embodiment, the power unit is a liquid cooled engine.
[0025] In an aspect, a vehicle comprises a power unit assembly, the power unit assembly includes a crankcase, and a cylinder head; and, a cooling assembly, the cooling assembly includes a radiator, a cooling pump, and a fan. The cooling pump being mounted on a right-hand side of the power unit in a vehicle front rear direction. The fan is mounted on the radiator, and the fan is covered in a shroud. The radiator and the fan are assembled together to form a cooling sub-assembly. The cooling sub-assembly being disposed obliquely at a forward portion of the power unit, on a right-hand side of a cylinder head and a front portion of a crankcase, when viewed from a vehicle front rear direction.
[0026] In an embodiment, the cooling sub-assembly being disposed at an angle of 25 – 45 degrees with respect to a central imaginary axis (A-A’) passing through the cooling pump.
Brief Description of Drawings
[0027] The detailed description is described with reference to an embodiment of a two wheeled saddle type motorized vehicle along with accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0028] Figure 1 is an exemplary illustration of saddle type two wheeled vehicle from a side view in a vehicle front rear direction.
[0029] Figure 2 (a) is an exemplary illustration of a frame structure along with the power unit of the saddle type vehicle from a top view of the vehicle.
[0030] Figure 2 (b) is an exemplary illustration of the frame structure of the vehicle along with the power unit shown in figure 2 (a) when seen from the right-hand side of the vehicle in a vehicle front rear direction.
[0031] Figure 3 is an exemplary illustration of the isometric view of the power unit of the vehicle comprising the IC engine, the exhaust, the transmission system and the cooling system of the vehicle.
[0032] Figure 4 is a right-hand side view of the exemplary illustration shown in figure 3 in a vehicle front rear direction, with cross sections A-A and B-B marked which have been illustrated in later figures.
[0033] Figure 5 is a top view of the exemplary illustration shown in figure 3 in a vehicle front rear direction.
[0034] Figure 6 is an exemplary illustration of the front view of the power unit in a vehicle width wise direction, along the cross-section A-A as shown in figure 3.
[0035] Figure 7 is an exemplary illustration of the top view of the power unit in a vehicle front rear direction, along the cross-section B-B as shown in figure 3.

Detailed Description
[0036] In an embodiment of the present subject matter, the vehicle consists of an internal combustion engine as a power unit. The power unit assembly of the vehicle comprises a crankcase, a cylinder head, an exhaust system, and a cooling sub-assembly. In an internal combustion engine, an air-fuel mixture is burned in a combustion chamber and the resultant gases then drive a piston, which rotates a crankshaft. The combustion chamber is housed in the cylindered, whereas the crankshaft is disposed in the crankcase. The rotation of the crankshaft is transferred to the wheel via a transmission assembly. The exhaust system is used to filter and then disperse the gases from the combustion chamber in each combustion cycle.
[0037] In an embodiment of the present subject matter, the power unit is liquid cooled. In the present subject matter, the cooling sub-assembly includes a radiator, a cooling pump, an inlet hose, an outlet hose and an electric fan. According to the present embodiment, the internal combustion engine of the power unit is a liquid cooled engine. It therefore requires a coolant to be pumped into the cooling circuit in order to dissipate the heat generated. Pumping the coolant requires a pump, known as a cooling pump. In the present embodiment, the cooling pump is mounted on a right side of said power unit in a vehicle front rear direction.
[0038] In an embodiment, the coolant pump has a dedicated electric motor. However, in the present embodiment of the current subject matter, the cooling pump is driven by a shaft, which is connected to the crankshaft. This shaft is disposed axially aligned to the crankshaft, on the opposite side of the transmission assembly. This is because the crankshaft is connected to the transmission assembly by means of a clutch. The transmission assembly includes the gears arranged in the gearbox, which uses the torque of the engine (through the crankshaft) to increase or decrease the speed of the driven wheel, such that output torque is inversely proportional to the output speed. This entire arrangement of the clutch and the gear assembly does not leave any opportunity for a cooling pump to be mounted axially to the crankshaft.
[0039] The coolant absorbs the heat from the power unit and disperses the absorbed heat into the ambient atmosphere when it is pumped out of the power unit’s cooling circuit. It will take a long time for the coolant to reach ambient temperature when it is pumped out, and hence, the coolant is cooled forcefully in a radiator. The radiator is configured so that the radiator has a coolant inlet slot and a coolant outlet slot. The hot coolant coming from the outlet of the power unit is let into the radiator. The coolant loses the heat that it has absorbed inside the power unit. For this purpose, air has to pass through the radiator continuously. Radiators in vehicles generally work based on the natural flow of air as the vehicle is being driven forward. Typically, radiators are placed at the very front of the vehicle just for this purpose, so that cool ambient air can pass through them without any disturbance. In vehicle configurations where this is not possible, where the radiator has been placed in a space without any ambient air directly flowing into the radiator, air has to be forced into the radiator to cool down the coolant liquid before it is pumped into the coolant circuit again. Such a forced air mechanism usually involves fans. Such a fan, or a plurality of fans in a vehicle, may be mechanically driven, or electrically driven.
[0040] In an embodiment of the present subject matter, an electric fan is mounted on the radiator. The fan is further covered and secured by a fan shroud. The inlet hose is connected to the radiator at a forward portion of the radiator in a vehicle front rear direction. The outlet hose is connected to the radiator at a rearward portion of the radiator in a vehicle front rear direction. The radiator and fan sub-assembly, i.e., the cooling system is disposed obliquely at a forward portion of the power unit beside the cylinder head. The radiator and fan sub-assembly is mounted to the power unit by one or more radiator mounting brackets. In another embodiment of the present subject matter, a first radiator mounting bracket is mounted ahead of the cooling pump in a vehicle front rear direction.
[0041] In an embodiment of the present subject matter, the power unit and the transmission assembly being mounted on a swingarm of the saddle type vehicle. The transmission assembly is a continuously variable transmission. In an embodiment, the electric fan is configured to be actuated when the engine temperature of the power unit is above a threshold temperature value. The electric fan is disposed towards the power unit, and the radiator being disposed outwards from the power unit towards a right side of the vehicle in a vehicle front rear direction. In an embodiment, the fan is disposed in a triangular space when viewed from a top perspective view of the power unit, the triangular space is defined by the cylinder head, crankcase and said radiator.
[0042] In an embodiment of the present subject matter, the saddle type vehicle comprises a frame assembly and a power unit assembly. The power unit assembly is swingably mounted on the frame assembly. The frame assembly comprises a head tube, a down tube, a main tube, rear tubes and cross bracket. The down tube extends obliquely downwards from the head tube. The pair of main tubes extends horizontally rearwards in a vehicle front-rear direction, and extends from a lowermost end of the down tube. The pair of main tubes extends obliquely upwards and rearwards after a first bend in the horizontal extension. The pair of main tubes are configured to have a second bend in a further rearward orientation. The pair of main tubes extending rearwards of the second bend are a pair of rear tubes. The cross bracket joins the pair of main tubes to the down tube.
[0043] In an embodiment, the power unit assembly comprises a crankcase, a cylinder head, a cooling pump and a radiator sub-assembly. The cylinder head is configured forward of the crankcase. The cooling pump is disposed on a right-hand side of the crankcase in a vehicle width wise direction. The cooling pump is driven by a shaft connected to a crankshaft, said crankshaft being rotatably disposed within the crankcase. The radiator sub-assembly comprises a radiator and an electric fan. The radiator and fan sub-assembly is angularly disposed at a position ahead of the crankcase. On a right hand side of said cylinder head, the radiator and fan sub-assembly is mounted on the crankcase by one or more radiator mounting brackets. The electric fan is mounted on the radiator in a space defined by an outer boundary of the cylinder head, an outer boundary of the crankcase and an outer boundary of said radiator.
[0044] In an embodiment of the present subject matter, an IC engine is swingably mounted at a rearward portion of a saddle type vehicle. A cooling system for the Internal Combustion (IC) Engine of the saddle type vehicle comprises a coolant liquid being pumped into a cooling circuit configured within the IC engine through an inlet hose. The coolant liquid is pumped out of said cooling circuit through an outlet hose. The coolant liquid is pumped by a cooling pump disposed on a right side of said IC engine in a vehicle width wise direction. The coolant liquid is cooled in a radiator and fan subassembly, the radiator subassembly comprising a radiator and an electric fan.
[0045] The said radiator and fan sub-assembly is disposed ahead of the cooling pump in a vehicle front rear direction. The radiator and fan sub-assembly is angularly disposed at a position ahead of a crankcase of the IC engine.
[0046] The following description is given according to an exemplary embodiment of the present subject matter.
[0047] Figure 1 is an exemplary illustration of a saddle type vehicle (100). The vehicle is steered by a handlebar (102). It has a step through type frame, which allows a floorboard (107) to be provided in the vehicle. A seat (103) is provided in the vehicle which allows the rider and pillion to operate the vehicle (100). The vehicle (100) comprises at least one front wheel (104) and at least one rear wheel (105). The rear wheel is mounted on a swingarm attached to a rear portion of the frame structure (200a, 200b) of the vehicle (100). The swingarm is also provided with a suspension system (106) which allows the swingarm to pivot about the mounting point on the frame (200a, 200b).
[0048] Figure 2(a) and 2(b) are exemplary representations of the frame structure (200a, 200b) and the power unit (300) of the vehicle (100) shown in figure 1. The power unit (300) is further shown in detail in figures 3 – 7. Figure 2 (a) is a top perspective view of the frame structure (200a), and figure 2(b) is a side perspective view of the frame structure (200b), including the power unit (300) in a vehicle (100) front rear direction. The vehicle (100) consists of a frame structure (200a, 200b) comprising a head tube (202), a down tube (204), a pair of main tubes (206) and a pair of rear tubes (208). A handlebar (102) and steering assembly is attached to the headtube. The downtube (204) extends obliquely downwards and rearwards from the headtube (204). The pair of main tubes (206) extends rearwardly from the bottom most portion of the downtube (204). The pair of main tube (204) undergoes a first bend, and subsequently extends obliquely upwards and rearwards, and undergo a second bend, extending rearwards to form the pair of rear tubes (208). The frame structure (200a, 200b) further consists of a cross bracket (222) which joins the down tube (204) and the pair of main tubes (206) after the first bend. As per the present embodiment, the power unit (300) of the vehicle (100) are mounted on the swingarm. Alternatively, the power unit (300) and the transmission casing itself acts as a swingarm of the vehicle (100) on which the rear wheel of the vehicle (100) is mounted. The power unit (300) consists of a cylinderhead (216), a crankcase (506), a radiator (218), a transmission case, and a wheel hub (214). A cooling pump (220) is further attached to be driven by the crankshaft of the power unit (300). The wheel hub (214) is used to mount a rear wheel (105) of the vehicle (100), the rear wheel (105) being the driven wheel of the vehicle (100). An exhaust system (210) is disposed rearwards of the engine, on the opposite side of the transmission casing.
[0049] Figure 3 is an isometric view of the power unit (300) of the vehicle (100), including the transmission casing and the exhaust system (210). The fan (502) is mounted on the radiator (218), and is further covered using a shroud, forming a radiator and fan sub-assembly. The radiator and fan sub-assembly is mounted ahead of the cooling pump (220). The cooling pump (220) is disposed on a right-hand side of the engine. The cooling pump (220) is driven by a shaft which is connected to the crankshaft of the engine. The exhaust assembly (210) consists of an exhaust pipe (210a) which is disposed below the cooling pump (220), and extends rearwards from the power unit. The radiator and fan subassembly is mounted to the power unit (300) by at least one radiator mounting bracket (304). The fan is covered by a fan shroud (302). An outlet hose (306) from the radiator (218) is connected to the cooling pump. The coolant that has been cooled in the radiator (218) is pumped by the cooling pump (220) into the cooling circuit configured in the engine. The hot coolant is fed back into the radiator (218) by an inlet hose (308) to the radiator (218). The inlet hose (308) connects the outlet to the cooling circuit to the radiator (218) inlet. The cooling pump is mounted to an Integrated Starter Generator (ISG) cover (310), which houses the ISG of the vehicle (100) on a right side of the engine. The cooling pump (220) is mounted further rightwards of the ISG cover (310). The ISG is driven by an extension of the crankshaft. The radiator and fan sub-assembly is mounted angularly ahead of the cooling pump (220) on a right side of the engine, at an angle of 25-45 degrees. The radiator (218) is mounted such that a front most portion of the radiator (218) is rearwards to a frontmost portion of the cylinderhead (216). A triangular space is therefore formed between the radiator (218), the crankcase (506) and the cylinderhead (216). The fan, protected by the fan shroud (302), is disposed in this space, and is mounted on the radiator (218).
[0050] Figure 4 is an exemplary illustration of the power unit (300) from a side perspective view in a vehicle (100) front rear direction. A first axis (A-A) and a second axis (B-B) are marked in this illustration, which have been referred to in later illustrations. In this illustration, it is clearly shown that the cooling pump (220) is mounted on a right hand side of the ISG cover (310). A rearmost portion of the radiator (218) is disposed ahead of the cooling pump (220). A frontmost portion of the radiator (218) is disposed rearwards of the frontmost portion of the cylinderhead (216). The inlet hose (308) to the radiator (218) and the outlet hose (306) to the radiator (218) are also shown. The fan is disposed in a triangular space defined by the radiator (218), the cylinderhead (216) and the crankcase (506), and therefore is not visible in this illustration. The axis (A-A) is marked such that it passes through the centre of the cooling pump (220).
[0051] Figure 5 is an exemplary illustration of the engine and transmission (500) subassembly from a top perspective view in a vehicle (100) front rear direction. The radiator (218), as described before, is disposed angularly ahead of the cooling pump (220), such that a frontmost portion of the radiator (218) is angled towards the cylinderhead (216). A triangular space is created between the crankcase (506), the radiator (218) and the cylinderhead (216). The crankcase (506) includes the crankshaft (604) of the engine. The crankshaft is connected to one or more pistons that are disposed in the cylinderhead (216). The cylinderhead (216) includes a combustion chamber in which a mixture of air and fuel is burned. The gases resulting from the combustion push the piston towards the crankcase, which generates a rotating motion in the crankshaft. This cycle continues wherein the piston returns into the cylinderhead and a subsequent combustion again pushes the piston towards the crankcase (506). The rotatory motion of the crankshaft (604) is used to move the vehicle forwards, the rotation being transferred to the rear wheel (105) by the transmission assembly. The crankshaft (604) also drives the ISG housed in the ISG case (310). A cooling pump (220) is disposed on the ISG case at a rightmost portion of the engine. The radiator (218) and fan (502) subassembly is disposed ahead of the cooling pump (220) on a right hand side of the engine. The fan (502) is covered by a fan shroud (302), and is disposed in the triangular space defined above. The cooling pump (220) pumps coolant from the radiator (218) into the cooling circuit of the engine.
[0052] Figure 6 is an exemplary illustration of a cross section view (600) of the crankcase (506) along the axis (A-A). The illustration shows the crankshaft (604), a join between the right side and the left side of the crankcase (601), and the driving shaft (602) for cooling pump (220) connected to the crankshaft (604). The crankshaft is driven by the piston. The crankshaft drives the ISG, and the shaft (602) driving the cooling pump (220). In this illustration, a cross section view of the exhaust pipe (210a) is also visible along the axis (A-A). The cooling circuit is configured in the crankcase such that the coolant is sealed from the combusting air-fuel mixture in the cylinderhead (216), and the lubrication oils in the crankcase (506). In an embodiment, the crankcase (506) may be built in two halves (a left half and a right half), which are joined together at 601 to provide the complete crankcase (506). This is done for the ease of manufacturability and assembly.
[0053] Figure 7 is an exemplary illustration of a cross section view of the crankcase (506) and the cylinderhead (216) of the engine assembly along the axis (B-B). This illustration shows the crankshaft (604), the combustion chamber (702) and the piston rod (704) which connects the piston head to the crankshaft (604). The combustion takes place in the combustion chamber (702) between the piston head and the inner face of the chamber (702). The shaft (602) driving the cooling pump (220) is shown as being connected to and driven by the crankshaft (604). The fan (502) is mounted on the radiator (218), such that the fan is facing towards the engine assembly when disposed in the triangular space. The outlet hose (308) from the radiator (218), being disposed below the axis (B-B) is also illustrated. The crankshaft drives the ISG as well. The cooling circuit is configured in the crankcase such that the coolant is sealed from the combusting air-fuel mixture in the cylinderhead (216), and the lubrication oils in the crankcase (506).
[0054] The advantages of the embodiment as described through the above illustrations of the present subject matter provide a number of advantages. The forced cooling system increases the efficiency of the system. The configuration of the radiator and fan subassembly allows a reduction of width of the vehicle, as opposed to the prior art, wherein the radiator is mounted on a right hand side of the crankcase. This improves the aerodynamic performance of the vehicle as a reduction of width reduces the aerodynamic drag of the vehicle as a result of the width of the vehicle at the rear. The fan being electrically driven allows the control systems of the vehicle to activate and deactivate the cooling system as required. In cold weathers, the engine will cool automatically in the ambient atmosphere, not requiring the cooling system, and saving energy generated by the ISG. The cooling pump on the other hand being driven by the crankshaft allows the advantage that the coolant is always being pumped into the cooling circuit of the engine, resulting in passive cooling even when the fan has not been actuated.
 
List of Reference Signs:

100 – Vehicle (Figure 1)
102 – Handlebar
103 – Seat assembly
104 – Front Wheel
105 – Rear wheel
106 – Suspension assembly
107 – Floorboard
200a – Top view of the frame, power unit of the vehicle (Figure 2(a))
200b – Side view of the frame, power unit of the vehicle (Figure 2(b))
202 – Headtube
204 – Down Tube
206 – Main Tube
208 – Rear tube
210 – Exhaust assembly
210a – Exhaust pipe
212 – Transmission (Assembly) case
214 – Wheel hub
216 – Cylinderhead
218 – Radiator
220 – Cooling pump
222 – Cross bracket
300 – Power unit

302 – Fan Shroud
304 – Radiator Mounting Bracket
306 – Outlet hose from radiator for the coolant
308 – Inlet hose to the radiator for the coolant
310 – Integrated Starter Generator Cover
502 – Fan
506 – Crankcase
601 – Join between the right side and the left side of the crankcase
602 – driving shaft for cooling pump connected to the crankshaft
604 – Crankshaft
702 – Combustion Chamber
704 – Piston rod
, Claims:We Claim:
1. A cooling assembly for a power unit (300) of a vehicle (100), the cooling assembly comprising:
a radiator (218),
a cooling pump (220), the cooling pump (220) is mounted on a right-hand side of the power unit (300) in a vehicle (100) front rear direction, and
a fan (502), the fan (502) is mounted on the radiator (218),
wherein,
the radiator (218) and the fan (502) being assembled together to form a cooling sub-assembly
wherein the cooling sub-assembly is disposed obliquely at a forward portion of the power unit (300), on a right-hand side of the cylinder head (216) and a front portion of a crankcase (506), when viewed from a vehicle front rear direction.

2. The cooling assembly as claimed in claim 1, wherein the cooling assembly further includes an inlet hose (308) and an outlet hose (306), the inlet hose (308) is connected to the radiator (218) at a forward portion of the radiator (218) in a vehicle (100) front rear direction, the outlet hose (306) is connected to the radiator (218) at a rearward portion of the radiator (218) in the vehicle (100) front rear direction.

3. The cooling assembly as claimed in claim 1, wherein the radiator (218) and the fan (502) is mounted to the power unit (300) by one or more radiator mounting brackets (304).

4. The cooling assembly as claimed in claim 3, wherein a first radiator mounting bracket (304) is ahead of the cooling pump (220) in a vehicle (100) front rear direction.

5. The cooling assembly as claimed in claim 3, wherein the fan (502) is enclosed by a shroud (302).

6. The cooling assembly as claimed in claim 1, wherein the fan (502) is configured to be actuated when a temperature of the power unit (300) is above a threshold value.

7. The cooling assembly as claimed in claim 1, wherein the fan (502) is disposed towards the power unit (300), and the radiator (218) is disposed outwards from the power unit (300).

8. The cooling assembly as claimed in claim 1, wherein the fan (502) is disposed in a triangular space when viewed from a top perspective view of the power unit (500), the triangular space is defined by the cylinder head (216), a crankcase (506) and the radiator (218).

9. The cooling assembly as claimed in claim 1, wherein a cooling pump (220) being driven by a shaft (602), the shaft (602) being connected to a crankshaft (604) of the power unit (300), the crankshaft (604) being rotatably disposed in the crankcase (506).

10. The cooling assembly as claimed in claim 1, wherein the cooling sub-assembly is disposed at an angle of 25 – 45 degrees with respect to an imaginary axis (A-A’) passing through a cooling pump (220).

11. The cooling assembly as claimed in claim 1, wherein the fan (502) being mounted on the radiator (218) in a space defined by an outer boundary of the cylinder head (216), an outer boundary of a crankcase (506) and an outer boundary of the radiator (218).

12. The cooling assembly as claimed in claim 1, wherein the power unit (300) is a liquid cooled engine.

13. A vehicle (100) comprising:
a power unit assembly (300), the power unit assembly (300) includes a crankcase (506), and a cylinder head (216) and a cooling assembly, the cooling assembly includes:
a radiator (218),
a cooling pump (220), the cooling pump (220) being mounted on a right-hand side of the power unit (300) in a vehicle (100) front rear direction; and
a fan (502), the fan (502) being mounted on the radiator (218), and the fan (502) being covered in a shroud (302),
wherein the radiator (218) and the fan (502) being assembled together to form a cooling sub-assembly;
wherein the cooling sub-assembly being disposed obliquely at a forward portion of the power unit (300), on a right-hand side of a cylinder head (216) and a front portion of a crankcase (506), when viewed from a vehicle front rear direction.

14. The vehicle as claimed in claim 13, wherein the cooling sub-assembly being disposed at an angle of 25 – 45 degrees with respect to a central imaginary axis (A-A’) passing through the cooling pump (220).