ES2199655B1 - RADIATOR MOUNT STRUCTURE IN VEHICLE. - Google Patents

Abstract

Radiator mounting structure in vehicle. Problem: In a vehicle in which a main engine body is mounted on a vehicle body frame in a position where an axial line of a cylinder hole is substantially in line with a front and rear direction of the body frame of vehicle, and a radiator constituting a portion of a cooling apparatus capable of circulating cooling water of a water jacket is attached to the main engine body on one side of the cylinder hole, facilitating the operation of air purging and the water filling operation in the refrigeration apparatus while avoiding an increase in cost. Solution means: A water filler cap 88 is removably and detachably mounted to an upper end of a water filler tube 87 extending upwardly from an end portion of an upper reservoir 77 in line with a direction front and rear of a vehicle body frame and a radiator 72 is attached to a main engine body 25 in an inclined position to a horizontal face such that the water filler cap 88 is disposed in a top position in a cooling apparatus 83.

Description

Radiator mounting structure in vehicle.

Detailed description of the invention Technical field to which the invention

The present invention relates to a vehicle in which a main engine body is mounted on a frame of vehicle body in a position where an axial line of a cylinder hole is substantially in line with a front and rear steering of the body frame of vehicle, and a radiator that has upper and lower deposits and a cooling core that connects the tanks constitutes a portion of a refrigeration apparatus capable of circulating water from cooling a water jacket and attached to the main body of engine on one side of the cylinder hole; refers in particular to an improvement in a structure to mount the radiator.

Prior art

A vehicle is conventionally known in which a radiator is attached to a main engine body mounted on a vehicle body frame to be arranged on one side of a cylinder hole provided by the main engine body, for example, in the Japanese Utility Model Publication number 78128/1984.

Problems to be solved by the invention

According to an engine described in the Publication of Japanese Utility Model number 78128/1984, the cylinder hole is mounted on the vehicle body frame in a position erected in line with an ascending and descending direction and, according to such a vehicle, a water jacket arranged in the body main motor also extends in the upward direction and descending and therefore a great degree of freedom is obtained by place conductive tubes in a refrigeration appliance in the ascending and descending direction, a difference in height and therefore the air purge of the device Refrigeration is excellent.

Meanwhile, according to a vehicle in which a main engine body is attached to a body frame of vehicle in a position where an axial line of a hole of cylinder is substantially in line with a forward direction and rear of a vehicle body frame, the length of a water jacket arranged in a main body of motor in the up and down direction, the degree is reduced of freedom when placing conductive tubes in a device cooling in the up and down direction, also reduces the height difference and therefore, it takes time to bleed the air from the cooling device and it takes time to introduce water

Although it is conceivable to use a radiator that has a special way in which a water filler cap protrudes of an upper tank along in an upward direction or arrange a water fill plug connected to a radiator and arranged separately from the radiator to increase the difference of height, the cost increases in such construction.

The present invention has been realized in view of such situation and its purpose is to provide a mounting structure of radiator in a vehicle that facilitates the operation of air purge and water filling operation in an appliance refrigeration while avoiding an increase in cost.

Means to solve the problems

To achieve the object described above, the invention described in claim 1 is characterized in that in a vehicle in which a main engine body that has a cylinder hole is mounted on a body frame of vehicle in a position where an axial hole line of cylinder is substantially in line with a forward direction and rear of the vehicle body frame, and a radiator constituted by connecting upper and lower tanks through a coolant core is attached to the main engine body in a side of the cylinder hole while constituting a portion of a cooling device capable of circulating water from cooling of a water jacket arranged in the main body of engine, a water filler cap is assembled in a unible way and separable at an upper end of a water filling tube that extends upward from an end portion of the reservoir upper in line with the front and rear steering of the frame of vehicle body and the radiator is attached to the body main motor in a position inclined to a horizontal face such that the water filler cap is arranged in a upper position in the refrigeration apparatus.

According to the constitution, tilting to the face horizontal the radiator in a general way that has the deposits upper and lower and the cooling core that connects the tanks, the cap mounted on the upper end of the tube water filling arranged in the end portion of the reservoir upper is arranged in the upper position in the apparatus of refrigeration and therefore an increase in the cost produced is avoided building the radiator in a special way, it increases comparatively the height difference in the apparatus of cooling and the operation of bleeding air from the Water filling tube and water filling operation.

In addition, the invention described in the claim 2 is characterized in that, in addition to the constitution of the invention described in claim 1, a connecting tube to connect a first conductive tube to conduct water from cooling is arranged at another end portion of the tank bottom in line with the front and rear rack direction Vehicle body and radiator tilt position to the horizontal face is established in such a way that the tube of connection is arranged in a lower position in the device cooling, depending on the construction, without increasing the length of the cooling core in the radiator, the air can be purged so excellent of a lower portion in the refrigeration apparatus and Water filling operation is also easier.

In addition, the invention described in the claim 3 is characterized in that, in addition to the constitution of the invention described in claim 1 or 2, the radiator is arranged in a position of overlapping at least a portion of the upper tank to a cylinder block of the main body of engine in a side view, one end of a second conductive tube arranged in an overlapping band of the upper tank and the cylinder block in side view and extending from substantially horizontal shape, is connected to the block of cylinders to communicate with the water jacket and other end of the second conductive tube is connected to the upper tank, according to the constitution, the second conductive tube that connects can be shortened the radiator and the cylinder block for water to flow from cooling between the water jacket and the radiator and you can achieve a compact formation of a water circulation circuit refrigerant in the refrigeration apparatus.

Brief description of the drawings

Figure 1 is a side view of the assembly of a scooter type motorcycle.

Figure 2 is an enlarged view of portions essentials of figure 1.

Figure 3 is a sectional view taken at along line 3-3 in figure 2.

Figure 4 is a side view as the Figure 3 from line 4-4.

Figure 5 is a side view in correspondence with figure 4 in a state in which it has been removed A radiator cover.

Figure 6 is a sectional view taken at along line 6-6 in figure 4.

Figure 7 is a plan view as the Figure 6 in the direction of an arrow mark 7.

Figure 8 is a perspective view of a radiator and radiator cover.

Description of the numbers and reference signs

25: body main engine 32a: Block of cylinders 41: hole of cylinder 72: radiator 77: Deposit higher 78: Deposit lower 79: nucleus refrigerant 82: shirt of Water 83: apparatus of refrigeration 87: filling tube Water 88: filler cap Water 89: tube of Connection 91: first tube driver 92: second tube driver F: body frame vehicle

Mode for practicing the invention

An explanation of one way will be given below of carrying out the invention based on an embodiment of the invention shown in the accompanying drawings.

Figures 1 to 8 show an embodiment of the invention; Figure 1 is a side view of the assembly of a motorcycle of a scooter type, figure 2 is an enlarged view of essential portions of figure 1, figure 3 is a view in section taken along line 3-3 of the Figure 2, Figure 4 is a side view as seen in Figure 3 from a line 4-4 of figure 3, figure 5 is a side view corresponding to figure 4 in a state in that a radiator cover has been removed, Figure 6 is a view in section taken along line 6-6 of the figure 4, figure 7 is a plan view as seen in figure 6 in the direction of an arrow mark 7, and figure 8 is a view in perspective of a radiator and radiator cover.

First, in Figure 1 and Figure 2, a vehicle body frame F of a type V motorcycle scooter that has a front wheel Wf directed by a handlebar steering 11 and a rear wheel Wr moved by a unit of P power of a tilting type, is divided into three: a frame front 12, a central frame 13 and a rear frame 14. The front frame 12 is constituted by a molten product of an aluminum alloy integrally provided with a front tube 12a, a down tube 12b and a floor support portion of step 12c. The central frame 13 in which the power unit P is tilted in the upward direction and descending by a pivot axis 15, is constituted by a molten product of an aluminum alloy and is coupled to a rear end of the front frame 12. The rear frame 14 extending to a rear upper side of the power unit P, is constituted by a tube element in a similar way to ring and a fuel tank 16 is supported on its upper face. A helmet compartment 17 is supported by an upper face of the central frame 13 and the helmet compartment 17 and the tank fuel 16 are covered openly and loosely by a cover 19 provided integrally with a seat 18.

The power unit P is constituted by a four-stroke E single-cylinder engine of a type cooled by water and a continuously variable transmission T of a belt type extending from a left side face of the engine E to a rear side of the vehicle body and an upper face rear of the continuously variable transmission T is coupled to a rear end of the central frame 13 by means of a shock absorber rear 20. The upper face of the transmission continuously variable T supports an air filter 21, a right side face of the continuously variable transmission T supports a silencer 22 and a lower face of the engine E supports a main support 23 that is You can go up and down.

\hbox{culata 35.}

In Figure 3 to Figure 5, an engine main body 25 of the engine E is provided with a first engine block 32 and a second engine block 33 divided by a split face 30 extending in the upward and downward direction along of a crankshaft 31, the first engine block 32 is integrally provided with a cylinder block 32a having a cylinder bore 41 and a crankcase half portion 32b constituting a crankcase together with the second engine block 33, a leading end of the first engine block 32 is coupled with a cylinder head 34 and a leading end of the cylinder head 34 is coupled with a cover of

 \ hbox {cylinder head 35.} 

The main engine body 25 is mounted on the vehicle body frame F substantially in line with the front and rear direction of the body frame of vehicle F while tilting a line slightly upwards axial L of the cylinder bore 41, and a support 27 arranged in a upper portion of the first engine block 32 is supported pivotally by the pivot shaft 15 fixed to the central frame 13 of the vehicle body frame F by means of a piece of rubber mount 28.

Continuously variable transmission of type T belt is provided with a right housing 37 and a housing left 38 coupled to each other and a right front side face of the right housing 37 is coupled to left side faces of the first and second motor blocks 32 and 33. In addition, a housing gear reducer 39 is coupled to a rear side face right of the right housing 37.

A piston 42 slidably engaged in the inside the cylinder hole 41 provided by the first engine block 32 is connected to crankshaft 31 via a connecting rod connection 43. An eccentric shaft 44 is rotatably supported by the cylinder head 34 and a suction valve and a valve Exhaust (not shown) arranged in cylinder head 34 are moved so that they are opened and closed by the axis of eccentric 44. A timing chain 45 is contained in a chain travel 40 arranged in the first engine block 32 and is causes timing chain 45 to wind in a pinion of drive 46 arranged in the crankshaft 31 and a gear wheel moved 47 arranged in the crankshaft 44. Therefore, the shaft of eccentric 44 is rotated once by two crankshaft rotations 31.

A drive pulley 54 is arranged in a left end of the crankshaft 31 protruding inside the right housing 37 and left housing 38. The pulley drive 54 is provided with a fixed side pulley half 55 fixed to the crankshaft 31 and a movable side pulley half 56 capable of approach and separate from the fixed side pulley half 55 and the mobile side pulley half 56 is pushed in a direction of Approach to the middle of fixed side pulley 55 by a ballast centrifuge 57 that moves to an outer side in the direction radial according to an increase in the number of crankshaft rotations 31.

A driven pulley 59 arranged on a shaft of output 58 supported between a rear portion of the right housing 37 and the reduction gear housing 39 is provided with a half of fixed lateral pulley 60 rotatably supported in relation to the axis output 58 and one half of mobile side pulley 61 capable of approach and separate from the fixed side pulley half 60 and the mobile side pulley half 61 is pushed to the middle pulley fixed side 60 by a spring 62. In addition, a starter clutch 63 it is arranged between the fixed side pulley half 60 and the shaft of output 58. In addition, an endless V-belt 64 is made to be wind between drive pulley 54 and driven pulley 59.

An intermediate shaft 65 and an axis 66 in parallel with the output shaft 58 is supported between the right housing 37 and the gearbox gearbox 39, and a gear train gearboxes 67 is disposed between the output shaft 58, the intermediate shaft 65 and the axle 66. In addition, the rear wheel Wr is arranged at one end shaft right 66 protruding to the right side penetrating the gear reducer housing 39.

In addition, the rotational power of the crankshaft 31 is transmits to drive pulley 54 and is transmitted from the drive pulley 54 to the rear wheel Wr via the belt in V 64, driven pulley 59, starter clutch 63 and train of reduction gears 67.

When the engine E spins at low speed, the centrifugal force exerted on the centrifugal ballast 57 of the pulley of drive 54 is small, and therefore the groove width between the half fixed side pulley 60 and the half side pulley mobile 61 is reduced by the spring 62 of the driven pulley 59 and the Speed reduction ratio is LOW. When the number of crankshaft rotations 31 increases from this state, it increases the centrifugal force exerted on the centrifugal ballast 57, the groove width between the fixed side pulley half is reduced 55 and half of the mobile side pulley 56 of the drive pulley 54, the groove width is increased accordingly between half of fixed side pulley 60 and half mobile side pulley 61 of the driven pulley 59 and therefore the reduction ratio of Speed is gradually changed from LOW to HIGH.

With reference also to Figure 6, a rotor 69 is fixed to the right side of the crankshaft 31 and a stator 70 that constitutes an alternating current generator 68 in cooperation with rotor 69 is fixed to the first and second motor blocks 32 and 33 so that it is surrounded by rotor 69. A fan refrigerator 71 is attached to a right end portion of the crankshaft 31 on an outer side of the AC generator 68, a radiator 72 is arranged by inserting the fan refrigerator 71 between radiator 72 and power generator alterna 68, a support housing 73 provided by the radiator 72 is fixed to the first and second motor blocks 32 and 33 for surround the cooling fan 71, and the radiator 72 is covered with a radiator cover 74 made of synthetic resin fixed to the support housing 73 of the radiator 72 from an outer side.

With reference also to Figure 7 and Figure 8, a ventilation grill 75 is provided to introduce air from outside into an outer side face of the radiator cover 74, a plurality of exhaust holes 76 ... in the support housing 73 on one side of the cooling fan 71 and when the cooling fan 71 is put into operation, the air introduced by the vent 75 cools the radiator 72 passing through the radiator 72 and is expelled through the discharge holes
76 ... outside.

The radiator 72 is provided with a tank upper 77, a lower tank 78, a cooling core 79 which connects the upper and lower tanks 77 and 78 and the housing of support 73, and support housing 73 is fixedly attached to the upper and lower tanks 77 and 78. In addition, the cooling air introduced by the vent 75 next to the radiator 72 cools the cooling water in the radiator 72 passing through the cooling core 79.

The radiator 72 constitutes a portion of a cooling apparatus 83 capable of circulating cooling water of a water jacket 82 arranged in the cylinder block 32a and the cylinder head 34 of the first engine block 32 in the body main engine 25, the cooling apparatus 83 is provided of a water pump 84 to supply cooling water to the water jacket 82, the radiator 72 interposed between the jacket of water 82 and an inlet port of the water pump 84 and a thermostat 85 to switch a state in which water from water jacket cooling 82 is returned to the pump water 84 surrounding radiator 72 and a state in which water from cooling is returned from the water jacket 82 to the pump water 84 through the radiator 72 according to the water temperature of refrigeration.

A thermostat housing 86 containing the thermostat 85 inside is coupled to a right side face of the cylinder head 34, and the water pump 84 arranged in a right end of eccentric shaft 44 is contained in a space surrounded by cylinder head 34 and thermostat housing 86.

A water filling tube 87 that extends upwards it is integrally provided with an end portion (rear end portion in that embodiment) of the reservoir upper 72 in line with the front and rear direction of the vehicle body frame F, and a water filler cap 88 that opens and closes by a turn operation is mounted at an upper end of the water filling tube 87. In addition, a connecting tube 89 protruding to the front side is arranged integrally in another end portion (front portion of end in this embodiment) of the bottom tank 78 in line with the front and rear steering of the body frame of vehicle F.

The radiator 72 is attached to the engine blocks first and second 32 and 33 of the main engine body 25 in a inclined position an angle α to the axial line L of the hole of cylinder 41 provided by the main engine body 25, so, when the radiator 72 is mounted on the frame of vehicle body F of the main engine body 25, the radiator 72 is in an inclined position an angle? towards forward to a horizontal face, the water filler cap 88 is arranged in the upper position in the refrigeration apparatus 83 and the connecting tube 89 is arranged in the lower position in the cooling apparatus 83.

By putting the radiator 72 in the inclined position an angle α to the axial line L of the hole of cylinder 41, the radiator 72 can be arranged so as to avoid the pivot shaft 25 to support the main engine body 25 at vehicle body frame F and a space for disposing an exhaust pipe 90 that communicates with an exhaust port of the cylinder head 32 on a rear side of a portion rear of the radiator 72, in order to facilitate therefore a degree of freedom when placing the exhaust pipe 90.

\hbox{termostato 86.}

The connection tube 89 of the radiator 72 is connected to one end of a first conductive tube 91 of a rubber hose or the like to conduct cooling water in the radiator 72 to one side of the thermostat 85, and another end of the first conductive tube 91 is connected to the housing of

 \ hbox {thermostat 86.} 

The radiator 72 is arranged in a position that flap at least one portion (front portion in this embodiment) from the upper tank 77 to the cylinder block 32a of the body main engine 25 in side view, in an overlapping band of the upper tank 77 and the cylinder block 32a in view side, a second conductive tube 92 whose end is connected to the cylinder block 32a to communicate with an upper portion of the water jacket 25 is arranged so that it extends from substantially horizontal in the direction of the width of the motorcycle and other end of the second conductive tube 92 is connected to the front portion of the upper tank 77.

In addition, one end of a third conductive tube 93 of a rubber hose or the like to transport water from cooling from water pump 84, is connected to the thermostat housing 86 and other end of the third conductive tube 93 is connected to a connecting tube 94 arranged in the block of cylinders 32a of the first engine block 32 to communicate with a lower portion of the water jacket 82.

A carburetor 95 connected to an orifice of cylinder head inlet 32 is connected to a tube (no illustrated) to transport cooling water from the jacket water 82 to heat carburetor 95 and a fourth conductive tube 96 of a rubber hose or the like to transport water from cooling to thermostat 85 after heating carburetor 95, It is connected to thermostat housing 86.

A fifth conductive tube 97 of a hose rubber or the like to purge air from the water pump 84 is connected to an upper portion of the thermostat housing 86, the fifth conductive tube 97 and a conductive tube (not illustrated) connected to the upper portion of the cylinder block 32a for bleed air from an upper portion of the inside of the shirt water 82 are connected in common to a sixth conductive tube 98 of a rubber hose or the like and the sixth conductive tube 98 is connected to an upper portion on a rear side of the tank upper 77 on the radiator 72.

In addition, one end of a seventh conductive tube 100 of a rubber hose or the like is connected to the tube of water filling 87 and other end of the seventh conductive tube 100 is connected to a tank (not shown) open to the atmosphere and arranged separately from the radiator 72. In addition, when the cooling water in the radiator 72 since its temperature is high, it overflows additional cooling water to the tank, and when the temperature of the cooling water in the radiator decreases 72, cooling water is returned from the reservoir to the radiator 72. When cooling water flows between the radiator 72 and the tank in this way, the air stored in the filling tube of Water 87 is expelled to the reservoir. That is, even when the engine E is put into operation, bleeding is performed excellently air of the refrigeration apparatus 83.

According to the refrigeration apparatus 83, in a termination state of engine E heating, water refrigerant discharged from the water pump 84 moved by the crankshaft 44 is supplied to the first engine block 32 and the sleeve of water 82 in cylinder head 34 through the housing of thermostat 86 and the third conductive tube 93, cools the engine E to the once it stops by the water jacket 82 and then it is supplied to the upper tank 77 of the radiator 72 through the second tube conductor 92. In addition, the cooling water whose temperature decreases while passing through the radiator 72 circulating from the upper tank 77 to lower tank 78 through the core refrigerant 79, the water pump 84 is returned through the first conductive tube 91 and thermostat 85. Meanwhile, when the engine E is warming up and the water temperature of cooling is low, thermostat 85 is put into operation to circulate cooling water surrounding the radiator 72, no coolant passes through the radiator 72, but circulates in the water jacket 82, carburetor 95 and water pump 84 for therefore raise the temperature gently.

Paying attention to figure 7 and figure 8, the radiator cover 74 fixed to the support housing 72 of the radiator 72 to cover radiator 72, is provided integrally of a position regulating portion 74a engaged with the stopper water filling 88 in a closed position to be able to join the radiator cover 74 to radiator 72 and prevent the plug from water filling 88 turn to an open position to cover the cap of water filling 88. In addition, the position regulating portion 74a is provided with a slot 99 to make a portion of the plug water filling 88 look outside.

Then, when explaining the operation of the embodiment, in the radiator 72 which constitutes a portion of the refrigeration apparatus 83 capable of circulating water of cooling of the water jacket 82 arranged in the body main engine 25, the rear end portion of the tank upper 77 in line with the front and rear direction of the vehicle body frame F, is fully provided of the water filling tube 87 extending upwards, the water filler cap 88 is assembled in a removable and detachable manner at an upper end of the water fill tube 87, and the radiator 72 is attached to the main engine body 25 in the position inclined an angle? to the horizontal face such that the water filler cap 88 is arranged in the position upper in the cooling apparatus 83. That is, tilting forward to a horizontal face the radiator 72 in general which has the upper and lower deposits 77 and 78 and the core refrigerant 79 that connects tanks 77 and 78, plug 88 mounted on the upper end of the water fill tube 87 disposed at the rear end portion of the upper tank 77 is arranged in the upper position in the apparatus of cooling 83.

Therefore, while avoiding an increase of the cost by forming the radiator 72 in a special way or by arranging a water filler cap in a reservoir connected to radiator 72 and arranged separately from the radiator 72, when water is filled from the water filling tube 87, the height difference in the apparatus of cooling 83 can be increased comparatively and can be facilitate the operation of bleeding air from the water filling tube 87 and the operation of filling it with water.

In addition, the connecting tube 89 to connect the first conductive tube 91 to transport cooling water from radiator 72 to thermostat 85, it is arranged in the portion front end of the lower tank 78 in line with the front and rear steering of vehicle body frame F, the inclined position of the radiator 72 relative to the face horizontal is established in such a way that the connecting tube 89 is disposed in the lower position in the cooling 83 and without increasing the length of the cooling core 79 on radiator 72, air can be purged excellently from the lower portion in the refrigeration apparatus 83 and more is provided Water filling operation.

In addition, the radiator 72 is arranged in the position that overlaps at least a portion of the upper tank 77 at cylinder block 32a in side view, one end of the second conductive tube 92 disposed in the tank overlap band upper 77 and the cylinder block 32a in side view and which extends from substantially horizontal, is connected to cylinder block 32a to communicate with the water jacket 82, other end of the second conductive tube 92 is connected to the upper tank 77 and therefore the second conductive tube 92 which connects radiator 72 and cylinder block 32a so that circulate cooling water between water jacket 82 and the radiator 72, can be shortened and training can be achieved of a refrigerant water circulation circuit in the cooling apparatus 83.

In addition, the position regulating portion 74a hooked with water filler cap 88 in the closed position to be able to attach the radiator cover 74 to the radiator 72 and avoid the water filler cap 88 rotate to the open position, it is provided integrally in the radiator cover 74 to cover the water filler cap 88 and therefore, by attaching the cover of radiator 74 to radiator 72, when the water filler cap 88 is in the closed position, the radiator cover 74 may be attached to the radiator 72 such that the regulating portion of position 74a engages with the water filler cap 88. So therefore, the operation is disregarded in particular to confirm that the water filler cap 88 is in the closed position, the Water fill cap position 88 can be confirmed only by the operation of joining the radiator cover 74 to the radiator 72 and assembly operation can be facilitated.

In addition, by engaging the regulatory portion of position 74a of the radiator cover 74 with the filler cap of water 88, the water filler cap 88 can be prevented from rotating from the closed position to the open position and therefore the Water filler cap 88 can be kept in the closed position while avoiding an increase in the number of pieces.

In addition, the position regulating portion 74a is provided with slot 99 to make a portion of the plug water filling 88 look out and the presence of the plug water filling 88 can be easily confirmed from outside the radiator cover 74.

Although, as described above, it has been explained the embodiment of the invention, the invention is not limited to the embodiment described above, but the design can be changed in several ways without departing from the invention described in the scope of the claims.

For example, although according to the embodiment before described, the case of applying the embodiment to a motorcycle V, the invention can be applied to another vehicle such Like a three wheel vehicle.

Effect of the invention

As described above, according to the invention described in claim 1, an increase of the cost that originates when building a radiator in a special way or arrange a water filler cap in a tank arranged by separated from a radiator, the difference in height in the apparatus of cooling can be increased comparatively and can be facilitate the operation of purging air from the water filling tube and Water filling operation.

In addition, according to the invention described in the claim 2, without increasing the length of the cooling core in the radiator, air can be purged excellently from a lower portion in the refrigeration apparatus and also It makes the water filling operation easier.

In addition, according to the invention described in the claim 3, the conductive tube connecting the radiator and the cylinder block can be shortened and training can be achieved of a refrigerant water circulation circuit in the refrigeration apparatus

Claims (3)

1. A radiator mounting structure in a vehicle characterized in that in a vehicle in which a main engine body (25) having a cylinder bore (41) is mounted on a vehicle body frame (F) in a position in which an axial line of the cylinder bore (41) is substantially in line with a front and rear direction of the vehicle body frame (F), and a radiator (72) having upper and lower reservoirs (77, 78 ) and a cooling core (79) for connecting the tanks (77, 78) is attached to the main engine body (25) on one side of the cylinder hole (41) while constituting a portion of a cooling apparatus ( 83) capable of circulating cooling water of a water jacket (82) disposed in the main motor body (25), a water filler cap (88) is assembled uniformly and detachably at an upper end of a tube water filling (87) extending towards arr it was going from an end portion of the upper tank (77) in line with the front and rear direction of the vehicle body frame (F) and the radiator (72) is attached to the main engine body (25) in a position inclined to a horizontal face such that the water filler cap (88) is disposed in an upper position in the refrigeration apparatus (83); also having a cooling fan (71) that is fixed to a right end portion of the crankshaft (31) on an outer side of the alternating current generator (68), as well as a radiator (72) that is arranged by inserting the cooling fan (71) between the radiator (72) and the AC generator. 2. The radiator mounting structure in a vehicle according to claim 1, characterized in that a connecting tube (89) for connecting a first conductive tube (91) to conduct the cooling water is arranged at another end portion of the lower tank (78) in line with the front and rear direction of the vehicle body frame (F) and the inclination position of the radiator (72) to the horizontal face is established such that the connecting tube (89) is arranged in a lower position in the refrigeration apparatus (83). 3. The radiator mounting structure in a vehicle according to claim 1 or 2, characterized in that the radiator (72) is arranged in a position to overlap at least a portion of the upper tank (77) to a cylinder block (32a) of the main engine body (25) in a side view, one end of a second conductive tube (92) disposed in an overlapping band of the upper tank (77) and the cylinder block (32a) in the side view and which is extends substantially horizontally, is connected to the cylinder block (32a) to communicate with the water jacket (82), and another end of the second conductive tube (92) is connected to the upper tank (77).