Title of Invention

A RADIATOR MOUNTING STRUCTURE IN A VEHICLE

Abstract

A radiator mounting structure in a vehicle characterized in that in a vehicle in which an engine main body (25) having a cylinder bore (41) is mounted to a vehicle body frame (F) along an axis 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 tanks (77, 78) and a cooling core (79) for connecting the tanks (77, 78), is attached to the engine main body (25) at a side of the cylinder bore (41) while constituting a portion of a cooling apparatus (83) capable of circulating cooling water of a water jacket (82) provided at the engine main body (25), a water filling cap (88) is attachably and detachably mounted to an upper end of a water filling pipe (87) extended upwardly from one 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 engine main body (25) face such that the water filling cap (88) is disposed at a topmost position in the cooling apparatus (83) and the axis line of cylinder bore (41) inclines the rear side of the body frame (F) and the radiator inclines forward of the body frame.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See Section 10; rule 13] "A RADIATOR MOUNTING STRUCTURE IN A VEHICLE" HONDA GIKEN KOGYO KABUSHIKI KAISHA, a corporation of Japan, having a place of business at 1-1, Minamiaoyama 2-chome, Minato-ku, Tokyo, Japan, The following specification particularly describes the invention and the manner in which it is to be performed: [Detailed Description of the Invention] [Technical Field to which the Invention Belongs] The present invention relates to a vehicle in which an engine main body is mounted to a vehicle body frame in an attitude in which an axis line of a cylinder bore is substantially in line with a front and rear direction of the vehicle body frame and a radiator having upper and lower tanks and a cooling core connecting the tanks, constitutes a portion of a cooling apparatus capable of circulating cooling water of a water jacket and attached to the engine main body at a side of the cylinder bore, particularly relates to an improvement in a structure of mounting the radiator. [Prior Art] Conventionally, there is known a vehicle in which a radiator is attached to an engine main body mounted to a vehicle body frame to arrange at a side of a cylinder bore provided by the engine main body in, for example, Japanese Utility Model Laid-Open No. 78128/1984. ,c\'t ,f ><_ r .-:y> [Problems that the Invention is to Solve] According to an engine disclosed in Japanese Utility Model Laid-Open No. 78128/1984, the cylinder bore is mounted to the vehicle body frame in an erect attitude in line with an up and down direction and according to such a vehicle, a water jacket provided at the engine main body is also prolonged in the up and down direction and therefore, there is provided a large degree of freedom in piping conducting pipes in a cooling apparatus in the up and down direction, a head difference is also provided and therefore, air bleeding from the cooling apparatus is excellent. Meanwhile, according to a vehicle in which an engine main body is attached to a vehicle body frame in an attitude in which an axis line of a cylinder bore is substantially in line with a front and rear direction of a vehicle body frame, a length of a water jacket provided to an engine main body in the up and down direction is reduced, the degree of freedom of piping conducting pipes in a cooling apparatus in the up and down direction is reduced, the head difference is also reduced and therefore, time is taken for bleeding air from the cooling apparatus and time is taken for filling water. Although it is conceivable to use a radiator having a special shape in which a water filling cap is projected from an upper tank longly in an upward direction or provide a water filling cap connected to a radiator and arranged separately from the radiator to increase the head difference, in such a constitution, the cost is increased. The present invention has been carried out in view of such a situation and it is an object thereof to provide a radiator mounting structure in a vehicle enabling to promote air bleeding performance and water filling performance in a cooling apparatus while avoiding an increase in cost. [Means for Solving the Problems] In order to achieve the above-described object, the invention described in Claim 1 is characterized in that in a vehicle in which an engine main body having a cylinder bore is mounted to a vehicle body frame in an attitude in which an axis line of the cylinder bore is substantially in line with a front and rear direction of the vehicle body frame and a radiator constituted by connecting upper and lower tanks via a cooling core, is attached to the engine main body at a side of the cylinder bore while constituting a portion of a cooling apparatus capable of circulating cooling water of a water jacket provided at the engine main body, a water filling cap is attachably and detachably mounted to an upper end of a water filling pipe extended upwardly from one end portion of the upper tank in line with the front and rear direction of the vehicle body frame and the radiator is attached to the engine main body in an attitude of being inclined to a horizontal face such that the water filling cap is disposed at a topmost position in the cooling apparatus. According to the constitution, by inclining the radiator in a general shape having the upper and the lower tanks and the cooling core connecting the tanks, to the horizontal face, the cap mounted to the upper end of the water filling pipe provided at the one end portion of the upper tank is disposed at the topmost position in the cooling apparatus and therefore, there is avoided an increase in cost caused by constituting the radiator in a special shape, a head difference in the cooling apparatus is comparatively increased and performance of bleeding air from the water filling pipe and water filling performance thereof can be promoted. Further, the invention described in Claim 2 is characterized in that, in addition to the constitution of the invention described in Claim 1, a connection pipe for connecting a first conducting pipe for conducting the cooling water is provided at other end portion of the lower tank in line with the front and rear direction of the vehicle body frame and the attitude of inclining the radiator to the horizontal face is set such that the connection pipe is disposed at a bottommost position in the cooling apparatus, according to the constitution, without increasing the length of the cooling core in the radiator, air can excellent be bled from a' lower portion in the cooling apparatus and also the water filling performance is further promoted. Further, the invention described in Claim 3 is characterized in that, in addition to the constitution of the invention described in Claim 1 or 2, the radiator is arranged at a position of overlapping at least a portion of the upper tank to a cylinder block of the engine main body in a side view, one end of a second conducting pipe arranged in a range of overlapping the upper tank and the cylinder block in the side view and extended substantially horizontally, is connected to the cylinder block to communicate with the water jacket and other end of the second conducting pipe is connected to the upper tank, according to the constitution, the second conducting pipe connecting the radiator and the cylinder block for flowing the cooling water between the water jacket and the radiator can be shortened and compact formation of a cooling water circulating circuit in the cooling apparatus can be achieved. The present invention relates to a radiator mounting structure in a vehicle characterized in that in a vehicle in which an engine main body having a cylinder bore is mounted to a vehicle body frame along an axis line of the cylinder bore is substantially in line with a front and rear direction of the vehicle body frame and a radiator having upper and lower tanks and a cooling core for connecting the tanks is attached to the engine main body at a side of the cylinder bore while constituting a portion of a cooling apparatus capable of circulating cooling water of a water jacket provided at the engine main body, a water filling cap is attachably and detachably rnounted to an upper end of a water filling pipe extended upwardly from one end portion of the upper tank in line with the front and rear direction of the vehicle body frame and the radiator is attached to the engine main body face such that the water filling cap is disposed at a topmost position in the cooling apparatus. [Brief Description of the Drawings] [Figure 1] Fig. 1 is a side view of a total of a motorcycle of a scooter type. [Figure 2] Fig. 2 is an enlarged view of essential portions of Fig. 1. [Figure 3] Fig. 3 is a sectional view taken along a line 3-3 of Fig. 2. [Figure 4] Fig. 4 is a side view viewing Fig. 3 from a line 4-4. [Figure 5] Fig. 5 is a side view in correspondence with Fig. 4 in a state of removing a radiator cover. [Figure 6] Fig. 6 is a sectional view taken along a line 6-6 of Fig. 4 . [Figure 7] Fig. 7 is a plane view viewing Fig. 6 in an arrow mark 7 direction. [Figure 8] Fig. 8 is a perspective view of a radiator and the radiator cover. [Mode for Carrying Out the Invention] An explanation will be given of a mode of carrying out the invention based on an embodiment of the invention shown in attached drawings. Fig. 1 through Fig. 8 show an embodiment of the invention, Fig. 1 is a side view of a total of a motorcycle of a scooter type, Fig. 2 is an enlarged view of essential portions of Fig. 1, Fig. 3 is a sectional view taken along a line 3-3 of Fig. 2, Fig. 4 is a side view viewing Fig. 3 from a line 4-4 of Fig. 3, Fig. 5 is a side view in correspondence with Fig. 4 in a state of removing a radiator cover, Fig. 6 is a sectional view taken along a line 6-6 of Fig. 4, Fig. 7 is a plane view viewing Fig. 6 in an arrow mark 7 direction and Fig. 8 is a perspective view of a radiator and the radiator cover. First, in Fig. 1 and Fig. 2, a vehicle body frame F of a motorcycle V of a scooter type having a front wheel Wf steered by a steering handlebar n and a rear wheel Wr driven by a power unit P of a swing type, is divided in three of a front frame 12, a center frame 13 and a rear frame 14. The front frame 12 is constituted by a cast product of an aluminum alloy integrally provided with a head pi&e 12a, a down tube 12b and a step floor support portion 12c. The center frame 13 in which the power unit P is supported swingably in the up and down direction via a pivot shaft 15, is constituted by a cast product of an aluminum alloy and is coupled to a rear end of the front frame 12. The rear frame 14 extended to a rear upper side of the power unit P, is constituted by a pipe member in a ring-like shape and a fuel tank 16 is supported at an upper face thereof. A helmet' case 17 is supported by an upper face of the center frame 13 and the helmet case 17 and the fuel tank 16 are openably and closably covered by a cc>ver 19 integrally provided with a seat 18. The power unit P is constituted by a single cylinder four cycle engine E of a water-cooled type and a continuously variable transmission T of a belt type extended from a left side face of the engine E to a rear side of the vehicle body and a rear upper face of the continuously variable transmission T is coupled to a rear end of the center frame 13 via a rear cushion 20. An air cleaner 21 is supported by the upper face of the continuously variable transmission T, a muffler 22 is supported by a right side face of the continuously variable transmission T and an erectable and fallable main stand 23 is supported by a lower face of the engine E. In Fig. 3 through Fig. 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 extended in the up and down direction along 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 along with the second engine block 33, a front end of the first engine block 32 is coupled with a cylinder head 34 and a front end of the cylinder head 34 is coupled with a head cover 35. The engine main body 25 is mounted to the vehicle body frame F substantially in line with the front and rear direction of the vehicle body frame F while inclining an axis line L of the cylinder bore 41 slightly upwardly, and a bracket 27 provided at an upper portion of the first engine block 32 is pivotably supported by the pivot shaft 15 fixed to the center frame 13 of the vehicle body frame F via a mount rubber 28. The continuously variable transmission T of the belt type is provided with a right casing 37 and a left casing 38 coupled to each other and a front right side face of the right casing 37 is coupled to left side faces of the first and the second engine blocks 32 and 33. Further, a reduction gear casing 39 is coupled to a rear right side face of the right casing 37. A piston 42 slidably fitted to inside of the cylinder bore 41 provided by the first engine block 32, is connected to the crankshaft 31 via a connecting rod 43. A cam shaft 44 is rotatably supported by the cylinder head 34 and a suction valve and an exhaust valve (not illustrated) provided at the cylinder head 34 are driven to open and close by the cam shaft 44. A timing chain 45 is contained in a chain path 40 provided at the first engine block 32 and the timing chain 45 is made to wrap on a drive sprocket 46 provided at the crankshaft 31 and a driven sprocket 47 provided at the cam shaft 44 . Thereby, the cam shaft 44 is rotated once per two rotations of the crankshaft 31. A drive pulley 54 is provided at a left end of the crankshaft 31 projected to insides of the right casing 37 and the left casing 38 . The drive pulley 54 is provided with a fixed side pulley half 55 fixed to the crankshaft 31 and a movable side pulley half 56 capable of approaching and separating to and from the fixed side pulley half 55 and the movable side pulley half 56 is urged in a direction of approaching to the fixed side pulley half 55 by a centrifugal weight 57 moving to an outer side in the radius direction in accordance with an increase in the rotational number of the crankshaft 31. A driven pulley 59 provided at an output shaft 58 supported between a rear portion of the right casing 37 and the reduction gear casing 39, is provided with a fixed side pulley half 60 supported rotatably relative to the output shaft 58 and a movable side pulley half 61 capable of approaching and separating to and from the fixed side pulley half 60 and the movable side pulley half 61 is urged to the fixed side pulley half 60 by a spring 62. Further, a starting clutch 63 is provided between the fixed side pulley half 60 and the output shaft 58. Further, a V belt 64 in an endless shape is made to warp between the drive pulley 54 and the driven pulley 59. An intermediate shaft 65 and an axle 66 in parallel with the output shaft 58 are supported between the right casing 37 and the reduction gear casing 39 and a reduction gear train 67 is provided among the output shaft 58, the intermediate shaft 65 and the axle 66. Further, the rear wheel Wr is provided at a right end of the axle 66 projected to the right side by penetrating the reduction gear casing 39. Further, rotational power of the crankshaft 31 is transmitted to the drive pulley 54 and is transmitted from the drive pulley 54 to the rear wheel Wr via the V belt 64, the driven pulley 59, the starting clutch 63 and the reduction gear train 67. When the engine E is rotated at low speed, centrifugal force operated to the centrifugal weight 57 of the drive pulley 54 is small and therefore, a groove width between the fixed side pulley half 60 and the movable side pulley half 61 is reduced by the spring 62 of the driven pulley 59 and the speed reduction ratio becomes LOW. When the rotational number of the crankshaft 31 is increased from the state, the centrifugal force operated to the centrifugal weight 57 is increased, the groove width between the fixed side pulley half 55 and the movable side pulley half 56 of the drive pulley 54 is reduced, a groove width between the fixed side pulley half 60 and the movable side pulley half 61 of the driven pulley 59 is increased in accordance therewith and therefore, the speed reduction ratio is changed in stepless from LOW to TOP. [QrtfZi] Also in reference to Fig. 6, a rotor 69 is fixed to the right side of the crankshaft 31 and a stator 70 constituting an alternating current generator 68 in cooperation with the rotor 69 is fixed to the first and the second engine blocks 32 and 33 to be surrounded by the rotor 69. A cooling fan 71 is fixed to a right end portion of the crankshaft 31 on an outer side of the alternating current generator 68, a radiator 72 is arranged to sandwich the cooling fan 71 between the radiator 72 and the alternating current generator 68, a support case 73 provided by the radiator 72 is fixed to the first and the second engine blocks 32 and 33 to surround the cooling fan 71 and the radiator 72 is covered with a radiator cover 74 made of synthetic resin fastened to the support case 73 of the radiator 72 from an outer side. Also in reference to Fig. 7 and Fig. 8, a louver 75 for introducing air from outside is provided to an outer side face of the radiator cover 74, a plurality of exhaust ports 76 ... are provided to the support case 73 at a side of the cooling fan 71 and when the cooling fan 71 is operated, air introduced from the louver 75 cools the radiator 72 by passing through the radiator 72 and is exhausted from the discharge ports 76 . . . to outside. The radiator 72 is provided with an upper tank 77, a lower tank 78, a cooling core 79 connecting the upper and the lower tanks 77 and 78 and the support case 73 and the support case 73 is fixedly attached to the upper and the lower tanks 77 and 78. Further, cooling wind introduced from the louver 75 to the side of the radiator 72 cools cooling water in the radiator 72 by 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 provided at tfre cylinder block 32a and the cylinder head 34 of the first engine block 32 in the engine main body 25, the cooling apparatus 83 is provided with a water pump 84 for supplying cooling water to the water jacket 82, the radiator 72 interposed between the water jacket 82 and an intake port of the water pump 84 and a thermostat 85 for switching a state in which cooling water from the water jacket 82 is returned to the water pump 84 by detouring the radiator 72 and a state in which cooling water is returned from the water jacket 82 to the water pump 84 via the radiator 72 in accordance with temperature of cooling water. A thermostat case 86 containing the thermostat 85 at inside thereof is coupled to a right side face of the cylinder head 34 and the water pump 84 provided at a right end of the cam shaft 44 is contained in a space surrounded by the cylinder head 34 and the thermostat case 86. A water filling pipe 87 extended upwardly is provided integrally with one end portion (rear end portion in this embodiment) of the upper tank 72 in line with the front and the rear direction of the vehicle body frame F and a water filling cap 88 opened and closed by rotating operation is mounted to an upper end of the water filling pipe 87. Further, a connection pipe 89 projected to the front side is integrally provided at other end portion (front end portion in this embodiment) of the lower tank 78 in line with the front and rear direction of the vehicle body frame F. The radiator 72 is attached to the first and the first engine blocks 32 and 33 of the engine main body 25 in an attitude being inclined to the axis line L of the cylinder bore 41 provided by the engine main body 25 by an angle Oi , thereby, when the radiator 72 is mounted to the vehicle body frame F of the engine main body 25, the radiator 72 is brought into an attitude forwardly inclined to a horizontal face by an angle |8 , the water filling cap 88 is arranged at the topmost position in the cooling apparatus 83 and the connection pipe 89 is arranged at the bottommost position in the cooling apparatus 83. By bringing the radiator 72 into the attitude inclined to the axis line L of the cylinder bore 41 by the angle Oi in this way, the radiator 72 can be arranged to avoid the pivot shaft 25 for supporting the engine main body 25 to the vehicle body frame F and a space for arranging an exhaust pipe 90 communicating with an exhaust port of the cylinder head 32 on a rear side of a rear portion of the radiator 72, is ensured to thereby enable to promote a degree of freedom of piping the exhaust pipe 90. [OJW^] The connection pipe 89 of the radiator 72 is connected with one end of a first conducting pipe 91 of a rubber hose or the like for conducting cooling water in the radiator 72 to a side of the thermostat 85 and other end of the first conducting pipe 91 is connected to the thermostat case 86. The radiator 72 is arranged at a position overlapping at least a portion (front portion in this embodiment) of the upper tank 77 to the cylinder block 32a of the engine main body 25 in side view, in a range of overlapping the upper tank 77 and the cylinder block 32a in side view, a second conducting pipe 92 one end of which is connected to the cylinder block 32a to communicate with an upper portion of the water jacket 25, is arranged to extend substantially horizontally in the width direction of the motorcycle and other end of the second conducting pipe 92 is connected to the front portion of the upper tank 77. Further, one end of a third conducting pipe 93 of a rubber hose or the like for conducting cooling water from the water pump 84, is connected to the thermostat case 86 and other end of the third conducting pipe 93 is connected to a connection pipe 94 provided to the cylinder block 32a of the first engine block 32 to communicate with a lower portion of the water jacket 82. A carburetor 95 connected to an intake port of the cylinder head 32, is connected with a pipe (not illustrated) for conducting cooling water from the water jacket 82 in order to heat the carburetor 95 and a fourth conducting pipe 96 of a rubber hose or the like for conducting cooling water after heating the carburetor 95 to the thermostat 85, is connected to the thermostat case 86. A fifth conducting pipe 97 of a rubber hose or the like for bleeding air from the water pump 84, is connected to an upper portion of the thermostat case 86, the fifth conducting pipe 97 and a conducting pipe (not illustrated) connected to the upper portion of the cylinder block 32a for bleeding air from an upper portion of inside of the water jacket 82, are commonly connected to a sixth conducting pipe 98 of a rubber hose or the like and the sixth conducting pipe 98 is connected to an upper portion on a rear side of the upper tank 77 in the radiator 72. Further, one end of a seventh conducting pipe 100 of a rubber hose or the like is connected to the water filling pipe 87 and other end of the seventh conducting pipe 100 is connected to a reservoir (not illustrated) opened to the atmosphere and arranged separately from the radiator 72. Further, when cooling water in the radiator 72 is expanded since temperature thereof is elevated, extra cooling water overflows to the reservoir and when temperature of cooling water in the radiator 72 is lowered, cooling water is returned from the reservoir to the radiator 72. By flowing cooling water between the radiator 72 and the reservoir in this way, air stored in the water filling pipe 87 is exhausted to the reservoir. That is, even when the engine E is operated, bleeding of air from the cooling apparatus 83 is carried out excellently. According to the cooling apparatus 83, in a state of finishing to warm up the engine E, cooling water discharged from the water pump 84 driven by the came shaft 44, is supplied to the first engine block 32 and the water jacket 82 in the cylinder head 34 via the thermostat case 86 and the third conducting pipe 93, cools the engine E while passing through the water jacket 82 and is thereafter supplied to the upper tank 77 of the radiator 72 via the second conducting pipe 92. Further, cooling water temperature of which is lowered while passing through the radiator 72 to flow from the upper tank 77 to the lower tank 78 via the cooling core 79, is returned to the water pump 84 via the first conducting pipe 91 and the thermostat 85. Meanwhile, when the engine E is being warmed up and temperature of cooling water is low, the thermostat 85 is operated to circulate cooling water to detour the radiator 72, cooling water does not pass through the radiator 72 but circulates in the water jacket 82, the carburetor 95 and the water pump 84 to thereby elevate temperature swiftly. Paying attention to Fig. 7 and Fig. 8, the radiator cover 74 fastened to the support case 72 of the radiator 72 to cover the radiator 72, is integrally provided with a position regulating portion 74a engaged with the water filling cap 88 at a closed position for enabling the radiator cover 74 to attach to the radiator 72 and preventing the water filling cap 88 from rotating to an opened position to cover the water filling cap 88. Further, the position regulating portion 74a is provided with a notch 99 for making a portion of the water filling cap 88 face outside. Next, when an explanation is given to operation of the embodiment, in the radiator 72 constituting a portion of the cooling apparatus 83 capable of circulating cooling water of the water jacket 82 provided to the engine main body 25, the rear end portion of the upper tank 77 in line with the front and rear direction of the vehicle body frame F, is integrally provided with the water filling pipe 87 extended upwardly, the water filling cap 88 is attachably and detachably mounted to an upper end of the water filling pipe 87 and the radiator 72 is attached to the engine main body 25 in the attitude inclined to the horizontal face by the angle /3 such that the water filling cap 88 is disposed at the topmost position in the cooling apparatus 83. That is, by forwardly inclining the radiator 72 in a general shape having the upper and the lower tanks 77 and 78 and the cooling core 79 connecting the tanks 77 and 78, to a horizontal face, the cap 88 mounted to the upper end of the water filling pipe 87 provided at the rear end portion of the upper tank 77 is arranged at the topmost position in the cooling apparatus 83. Therefore, while avoiding an increase in cost by constituting the radiator 72 in a special shape or by providing a water filling cap to a tank connected to the radiator 72 and arranged separately from the radiator 72, when water is filled from the water filling pipe 87, the head difference in the cooling apparatus 83 can comparatively be increased and the performance of bleeding air from the water filling pipe 87 and water filling performance thereof can be promoted. Further, the connection pipe 89 for connecting the first conducting pipe 91 for conducting cooling water from the radiator 72 to the thermostat 85, is provided to the front end portion of the lower tank 78 in line with the front and rear direction of the vehicle body frame F, the inclined attitude of the radiator 72 relative to the horizontal face is set such that the connection pipe 89 is disposed at the bottommost position in the cooling apparatus 83 and without increasing the length of the cooling core 79 in the radiator 72, air can excellently be bled from the lower portion in the cooling apparatus 83 and the water filling performance is further promoted. Further, the radiator 72 is arranged at the position overlapping at least a portion of the upper tank 77 to the cylinder block 32a in side view, one end of the second conducting pipe 92 arranged in the range of overlapping the upper tank 77 and the cylinder block 32a in side view and extended substantially horizontally, is connected to the cylinder block 32a to communicate with the water jacket 82, other end of the second conducting pipe 92 is connected to the upper tank 77 and therefore, the second conducting pipe 92 connecting the radiator 72 and the cylinder block 32a to flow cooling water between the water jacket 82 and the radiator 72, can be shortened and compact formation of a cooling water circulating circuit in the cooling apparatus 83 can be achieved. Further, the position regulating portion 74a engaged with the water filling cap 88 at the closed position for enabling the radiator cover 74 to attach to the radiator 72 and preventing the water filling cap 88 from rotating to the opened position, is integrally provided to the radiator cover 74 to cover the water filling cap 88 and therefore, in attaching the radiator cover 74 to the radiator 72, when the water filling cap 88 is at the closed position, the radiator cover 74 can be attached to the radiator 72 such that the position regulating portion 74a is engaged with the water filling cap 88. Therefore, operation of particularly confirming that the water filling cap 88 is at the closed position, is dispensed with, the position of the water filling cap 88 can be confirmed by only operation of attaching the radiator cover 74 to the radiator 72 and assembling performance can be promoted. Further, by engaging the position regulating portion 74a of the radiator cover 74 with the water filling cap 88, the water filling cap 88 can be prevented from rotating from the closed position to the opened position and therefore, the water filling cap 88 can be maintained at the closed position while avoiding an increase in a number of parts. Further, the position regulating portion 74a is provided with the notch 99 for making a portion of the water filling cap 88 face outside and presence of the water filling cap 88 can be confirmed easily from outside of the radiator cover 74. Although as described above, an explanation has been given of the embodiment of the invention, the invention is not limited to the above-described embodiment but design can be changed variously without deviating from the invention described in the scope of claims. For example, although according to the above-described embodiment, an explanation has been given of the case of applying the embodiment to a motorcycle V, the invention is applicable to other vehicle such as a three-wheeled vehicle. 104437} [Effect of the Invention] As described above, according to the invention described in Claim 1, there is avoided an increase in cost caused by constituting a radiator in a special shape or providing a water filling cap to a tank arranged separately from a radiator, a head difference in the cooling apparatus can comparatively be increased and performance of bleeding air from the water filling pipe and water filling performance can be promoted. [-Q-ftS^-J Further, according to the invention described in Claim 2, without increasing the length of the cooling core in the radiator, air can excellently be bled from a lower portion in the cooling apparatus and also the water filling performance is further promoted. Further, according to the invention described in Claim 3, the conducting pipe connecting the radiator and the cylinder [Description of the Reference Numerals and Signs] 25 Engine main body 32a Cylinder block 41 Cylinder bore 72 Radiator 77 Upper tank 78 Lower tank 79 Cooling core 82 Water jacket 03 Cooling apparatus 07 Water filling pipe I 08 Water filling cap 89 Connection pipe 91 First conducting pipe 92 Second conducting pipe f Vehicle body frame WE CLAIM: 1. A radiator mounting structure in a vehicle characterized in that in a vehicle in which an engine main body (25) having a cylinder bore (41) is mounted to a vehicle body frame (F) along an axis 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 tanks (77, 78) and a cooling core (79) for connecting the tanks (77, 78), is attached to the engine main body (25) at a side of the cylinder bore (41) while constituting a portion of a cooling apparatus (83) capable of circulating cooling water of a water jacket (82) provided at the engine main body (25), a water filling cap (88) is attachably and detachably mounted to an upper end of a water filling pipe (87) extended upwardly from one 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 engine main body (25) face such that the water filling cap (88) is disposed at a topmost position in the cooling apparatus (83) and the axis line of cylinder bore (41) inclines the rear side of the body frame (F) and the radiator inclines forward of the body frame. 2. The radiator mounting structure in a vehicle as claimed in claim 1, wherein a connection pipe (89) for connecting a first conducting pipe (91) for conducting the cooling water is provided at other end portion of the lower tank (78) in line with the front and rear direction of the vehicle body frame (F) and the attitude of inclining the radiator (72) to the horizontal face is set such that the connecting pipe (89) is disposed at a bottommost position in the cooling apparatus (83). 3. The radiator mounting structure in a vehicle as claimed in claims 1 or 2, wherein the radiator (72) is arranged at a position of overlapping at least a portion of the upper tank (77) to a cylinder block (32a) of the engine main body (25) in a side view, one end of a second conducting pipe (92) arranged in a range of overlapping the upper tank (77) and the cylinder block (32a) in the side view and extended substantially horizontally, is connected to the cylinder block (32a) to communicate with the water jacket (82) and other end of the second conducting pipe (92) is connected to the upper tank (77). 4. A radiator mounting structure in a vehicle substantially as hereinbefore described with reference to the accompanying drawings.

Documents:

925-mum-2001-cancelled pages(31-10-2006).pdf

925-mum-2001-claims(granted)-(31-10-2006).doc

925-mum-2001-claims(granted)-(31-10-2006).pdf

925-mum-2001-correspondence(10-01-2007).pdf

925-mum-2001-correspondence(ipo)-(13-03-2007).pdf

925-mum-2001-drawing-(18-10-2001).pdf

925-mum-2001-form 1(25-09-2001).pdf

925-mum-2001-form 1(31-10-2006).pdf

925-mum-2001-form 18(02-09-2005).pdf

925-mum-2001-form 2(granted)-(31-10-2006).doc

925-mum-2001-form 2(granted)-(31-10-2006).pdf

925-mum-2001-form 3(15-11-2001).pdf

925-mum-2001-form 3(17-07-2006).pdf

925-mum-2001-form 3(25-09-2001).pdf

925-mum-2001-form 5(25-09-2001).pdf

925-mum-2001-form 5(31-10-2006).pdf

925-mum-2001-petition under rule 137(18-07-2006).pdf

925-mum-2001-petition under rule 138(18-07-2006).pdf

925-mum-2001-power of authority(14-12-2001).pdf

925-mum-2001-power of authority(31-10-2006).pdf