JP4394552B2 - Radiator arrangement structure of motorcycle - Google Patents

Description

  The present invention relates to an improvement in a radiator arrangement structure of a motorcycle.

As a conventional radiator arrangement structure for a motorcycle, a structure in which a radiator is arranged between body frames in front of an engine is known (for example, see Patent Document 1).
JP 2003-89349 A

Patent Document 1 will be described. For the reference numerals, those described in the same publication were used.
As shown in FIG. 1 and FIG. 40 of the publication, the motorcycle 1 has a gusset 32 attached to the rear portion of the head pipe 21 and a pair of left and right down pipes 33 extending substantially downward from the gusset 32. The radiator 10 is disposed between the two and the radiator 10 is positioned in front of the engine 9.

  Since the radiator 10 is disposed at a position that is best seen from the front of the vehicle between the left and right down pipes 33 in front of the engine 9, for example, even if the design of the engine 9 is improved, the engine 9 cannot be seen from the side of the vehicle. Although it can be seen, it becomes difficult to see from the front of the vehicle or from the diagonally forward side of the vehicle. Therefore, it is conceivable to provide a radiator at the rear of the vehicle body, but it is desirable to arrange the radiator so that it is as difficult to see as possible when viewed from the front of the vehicle.

  Accordingly, an object of the present invention is to improve the appearance of a motorcycle by improving the radiator arrangement structure of the motorcycle.

The invention according to claim 1 is a motorcycle equipped with a water-cooled engine, wherein the radiator is attached to a pair of left and right main frames extending rearward from the head pipe so that the cooling surface is directed to the side of the vehicle . A side cover that is placed inside the pair of left and right seat rails , standing along the seat rails and standing in the space between the engine and the rear wheel, so as to cover the radiator and the side of the space. Is provided with an intake duct and an exhaust duct .

  By arranging the radiator in the space between the engine and the rear wheel, the front of the radiator is covered with the engine, and the rear of the radiator is covered with the rear wheel. Therefore, the radiator becomes difficult to see from the vehicle front-rear direction.

  By providing the exhaust duct in the side cover that covers the radiator and the side of the space, the exhaust duct discharges the air downstream of the radiator, so the amount of air passing through the radiator increases and the cooling performance by the radiator increases.

  By arranging the radiator along the seat rail inside the seat rail, the air passing through the radiator can be efficiently flowed, and while contributing to the downsizing of the left and right width of the motorcycle, the area of the cooling unit is reduced. It becomes possible to secure.

The invention according to claim 2 is characterized in that, in each of the above-described configurations, the radiator is preferably arranged on each of the left and right sides of the vehicle body.
By arranging the radiators on the left and right sides of the vehicle body, the respective radiators become smaller and can be easily arranged even in a narrow space .

In the invention according to claim 3 , in each of the above-described configurations, preferably, a pair of left and right main frames are extended rearward from a head pipe that supports a front fork so as to be steerable, and the insides of these main frames are each formed in a duct shape. Thus, the traveling wind is guided to the space through the main frame from the vicinity of the head pipe.

  The inside of the duct-shaped main frame guides the traveling wind from the vicinity of the head pipe to the space, so that a large amount of traveling wind strikes the radiator. As a result, cooling of the cooling water by the radiator is promoted.

The invention according to claim 4 is characterized in that the intake duct is provided above the front part of the side cover and the exhaust duct is arranged below the rear part of the side cover.

In the invention according to claim 5, the center duct is attached between the left and right main frames, and the front end portion of the center duct is disposed between a pair of left and right down pipes extending substantially downward and rearward from the head pipe. The rear end portion is arranged in the space.

The invention according to claim 6 is characterized in that the rear side of the radiator is covered with a shroud, and the air flow in the space is changed and collected on the radiator side.
The flow of the traveling wind is changed to the radiator side by the shroud and can pass through the radiator to cool the radiator.

  In the invention according to claim 1, since the radiator is arranged in the space between the engine and the rear wheel, the radiator can be made difficult to see from the outside as compared with the case where the radiator is arranged in the front part of the vehicle body frame. it can. Therefore, the radiator is difficult to be exposed to the outside, and the appearance of the vehicle can be improved because the engine is not covered with the radiator when the design of the engine is enhanced.

Moreover, since the exhaust duct is provided in the side cover that covers the side of the radiator and the space, the amount of air passing through the radiator can be increased in order to discharge the air downstream of the radiator through the exhaust duct, and cooling by the radiator Can increase the sex.

Furthermore, because the radiator is placed along the seat rails inside the pair of left and right seat rails attached to the main frame, the air passing through the radiator can be efficiently flowed and the left and right width of the motorcycle can be made compact. It is possible to secure the area of the cooling section while contributing to the above, and the cooling performance by the radiator can be improved.

In the invention according to claim 2, since the radiators are arranged on the left and right sides of the vehicle body, the respective radiators can be made small, and even when the space is narrow, the radiators can be arranged easily and efficiently. compact, as possible out is possible to reduce the size.

In the invention according to claim 3 , the amount of traveling airflow guided to the space between the engine and the rear wheel can be increased by the duct-shaped main frame, and water cooling by the radiator can be promoted.

In the invention according to claim 4, the intake duct is provided above the front part of the side cover, and the exhaust duct is arranged below the rear part of the side cover.

In the invention according to claim 5, the center duct is attached between the left and right main frames, and the front end portion of the center duct is disposed between the pair of left and right down pipes extending substantially downward and rearward from the head pipe. The rear end was placed in space.

In the invention according to claim 6, the rear side of the radiator is covered with a shroud and the air flow in the space is changed and collected on the radiator side, so by providing the shroud, the amount of air passing through the radiator can be increased, Coolability can be improved.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a motorcycle adopting a radiator arrangement structure according to the present invention. The motorcycle 10 includes a power unit 14 including a water-cooled engine 12 and a transmission 13 mounted on a body frame 11, and a radiator (not shown). An American type of which the two exhaust pipes (the first exhaust pipe 17 and the second exhaust pipe 18) extending from the engine 12 are shortened is arranged between the engine 12 and the rear wheel 16. It is a vehicle.
This type of vehicle tends to favor an air-cooled engine as a user's preference. Therefore, if the radiator is not conspicuous as an appearance, it has a feature that the design is enhanced.

  FIG. 2 is a side view of a motorcycle according to the present invention. The motorcycle 10 includes a body frame 11 having a head pipe 21 and a pair of left and right main frames 22 (one of the left and right main frames 22). Only the main frame 22 is shown. Hereinafter, only one symbol is shown for a pair of left and right parts), a pair of left and right seat rails 23 extending obliquely downward and rearward from the main frame 22, and substantially downward from the head pipe 21. A pair of left and right down pipes 24 extending rearward and a pair of left and right pivot plates 26 connected between the rear end of the seat rail 23 and the rear end of the down pipe 24, and the front fork 27 can be steered to the head pipe 21. This is a vehicle in which a swing arm 28 is swingably attached to a pivot plate 26, Mounting a front wheel 31 at the lower end of the cement forks 27, mounting the rear wheel 16 to the rear end of the swing arm 28.

  Here, 41 is a front fender that covers the upper side of the front wheel 31, 42 is a handle attached to the upper end of the front fork 27, 43 is a headlamp, 44 is a fuel tank attached to the main frames 22 and 22, 46 is a seat rail 23, 23 is a rear fender that covers the upper and front sides of the rear wheel 16, 48 is a pair of left and right fender stays attached to the left and right seat rails 23 to support the rear fender 47, and 51 is a tail lamp.

  The engine 12 is V-shaped, and the exhaust device 55 includes a first exhaust pipe 17 extending substantially downward and rearward from the front cylinder 56, and a second exhaust pipe extending obliquely forward and downward and rearward from the rear cylinder 58. 18 and a muffler (not shown) disposed below the power unit 14 for connection to the first exhaust pipe 17 and the second exhaust pipe 18, and the first exhaust pipe 17 and the second exhaust pipe 18. Each rear end extends to a position below a pivot shaft 63 attached to the left and right pivot plates 26 in order to swingably support the swing arm 28. Reference numeral 61 denotes an under cover that covers the periphery of the silencer.

  In the conventional exhaust system, the exhaust pipe and the silencer are extended to the side of the rear wheel, but in the present invention, the rear ends of the first exhaust pipe 17 and the second exhaust pipe 18 are arranged in the vicinity of the pivot shaft 63. Since the side of the rear wheel 16 side is not covered with the exhaust pipe and the silencer, a simple impression is given to the appearance of the rear wheel 16 side, and almost the entire design of the rear wheel 16 with high design is the same as that of the front wheel 31. Since it becomes visible, the appearance can be improved.

  The engine 12 in the figure, specifically, between the power unit 14 and the rear wheel 16 is a space in which a radiator (not shown) is arranged. Both sides of this space are covered with side covers 65, and these side covers 65 are respectively covered. An intake duct 66 and an exhaust duct 67 were provided.

  FIG. 3 is a side view of a main part of the motorcycle according to the present invention, and mainly shows the left side of the body frame 11 and the power unit 14. In addition, the arrow (FRONT) in a figure represents the vehicle front.

The power unit 14 includes a water pump 72 on the side surface of the crankcase 71, and the water pump 72 connects a discharge pipe 73 to the rear cylinder 58 of the engine 12 and connects a suction pipe 74 to the lower end of the radiator 75. .

  Here, 77 is a first cooling water pipe connected to the front cylinder 56 and the rear cylinder 58, 78 is a collecting portion disposed between the front cylinder 56 and the rear cylinder 58, and 82 is a front cylinder 56 and the collecting portion. 78 is a second cooling water pipe that connects 78, 83 is a third cooling water pipe that connects the rear cylinder 58 and the collecting portion 78, and 84 is a fourth cooling water pipe that connects the collecting portion 78 and the upper part of the radiator 75. , 86 is a cap provided in the collecting portion 78 for pouring cooling water.

The radiators 75 and 75 (only the reference numeral 75 on the front side is shown) are rectangular plate-like parts that are attached to the left and right pivot plates 26 and are arranged between the left and right pivot plates 26. The inner side surface 75a (not shown) and the outer side surface 75b are arranged so as to extend substantially in the vehicle front-rear direction, that is, the inner side surface 75a and the outer side surface 75b are arranged so as to be directed substantially to the side of the vehicle. (In detail, the upper and lower portions of each radiator 75 are attached to the pivot plate 26).
That is, the radiator 75 is disposed in a space 87 between the engine 12 and the rear wheel 16, specifically, between the power unit 14 and the rear wheel 16.

  The main frame 22 is a member that is formed in a hollow shape and has a front end portion 22a and a rear end portion 22b that are opened in a duct shape. The running air is taken in from the front end portion 22a and discharged from the rear end portion 22b to the radiator 75. Guide the driving wind.

  Reference numeral 88 in the figure is attached between the left and right main frames 22, and an open front end portion 88 a is disposed between the left and right down pipes 24, and a rear end portion 88 b (not shown) is disposed at the rear end portion 22 b of the main frame 22. It is a center duct provided in the vicinity.

  FIG. 4 is a plan view of an essential part of the motorcycle according to the present invention, in which a center duct 88 is attached between the left and right main frames 22, 22, and the rear ends 22b of the main frame 22, 22 and the center duct 88, 22b and 88b are aligned, and seat rails 23 and 23 attached to the left and right main frames 22 and 22 are attached, and the radiators 75 and 75 are arranged between the seat rails 23 and 23 along the respective seat rails 23 in a plan view. And the intake duct 66 and the exhaust duct 67 are respectively attached to the side covers 65 and 65 located inside the seat rails 23 and 23 in plan view. In addition, 91 is a cross member attached between the left and right seat rails 23, 23, and 46 is a seat.

FIGS. 5A and 5B are perspective views for explaining a vehicle body frame according to the present invention.
In (a), the main frame 22 constituting the vehicle body frame 11 is a member having a front end portion 22a as a trapezoidal shape, and the center duct 88 has a rear portion between the left and right main frames 22, 22. It is a member that is mounted and disposed between the left and right down pipes 24 in a trapezoidal shape with a front end 88a serving as an opening.

  (B) shows the rear portions of the main frames 22 and 22 and the center duct 88 that are similarly bent so that the rear end portions 22b, 22b, and 88b, which are the respective opening portions, face rearward and obliquely downward.

Next, the operation of the radiator arrangement structure described above will be described.
FIG. 6 is a first operation diagram showing the operation of the radiator arrangement structure according to the present invention.
When the engine 12 is started, the water pump 72 is activated, and the cooling water is supplied to the discharge pipe 73, the water jacket in the rear cylinder 58, the first cooling water pipe 77, and the water in the front cylinder 56 as indicated by arrows. It flows in the order of the jacket, the second cooling water pipe 82, and the collecting portion 78 (from the water jacket in the rear cylinder 58 to the third cooling water pipe 83 and the collecting portion 78), and further from the collecting portion 78 to the fourth. It flows into the radiator 75 through the cooling water pipe 84, and further sucks into the water pump 72 through the suction pipe 74 from the radiator 75.

  And if a vehicle drive | works, as shown by the arrow, driving wind can be taken in in the main frame 22 and the center duct 88 from the front-end part 22a of the main frame 22, and the front-end part 88a of the center duct 88, These mains. The running air is blown out to the space 87 from the frame 22 and the rear end portions 22 b and 88 b of the center duct 88, and the radiator 75 is allowed to pass through to cool the radiator 75.

FIG. 7 is a second operation diagram showing the operation of the radiator arrangement structure according to the present invention.
As indicated by the arrows, the traveling wind flows into the space 87 from the main frames 22 and 22 and the center duct 88, and further flows into the space 87 from the side of the vehicle body through the left and right intake ducts 66 and 66. , 75 can be used to cool the radiators 75, 75. After passing through the radiator 75, the traveling wind passes through a space 87 a (a space included in the space 87) between the radiator 75 and the side cover 65 and is discharged to the outside from the exhaust ducts 67 and 67.

FIG. 8 is an explanatory view showing another embodiment of the radiator arrangement structure according to the present invention. The same components as those of the embodiment shown in FIG.
The radiator 75 is attached to the left and right pivot plates 26 (see FIG. 3) and disposed between the left and right pivot plates 26, and the inner side surface 75a and the outer side surface 75b of the radiator 75 are directed substantially toward the vehicle side. And stood up.

  That is, the radiator 75 is disposed in the space 87 between the engine 12 (see FIG. 3) and the rear wheel 16, more specifically between the power unit 14 (see FIG. 3) and the rear wheel 16. Reference numeral 95 denotes a shroud that covers the rear side of the radiator 75 and collects the air in the space 87 on the radiator 75 side by changing the flow of air.

  While the vehicle is traveling, as shown by the arrows, the traveling wind flows into the space 87 from the main frames 22 and 22 and the center duct 88, and from the side of the vehicle body through the left and right intake ducts 66 and 66. Flows in. The flow of the traveling wind is changed to the radiator 75 side by the shroud 95 and can pass through the radiator 75 to cool the radiator 75. Thus, by providing the shroud 95, the air volume which passes the radiator 75 can be increased, and cooling property can be improved.

  After passing through the radiator 75, the traveling wind passes through a space 87 a (a space included in the space 87) between the radiator 75 and the side cover 65 and is discharged to the outside from one exhaust duct 67.

  As described above with reference to FIGS. 2 and 3, according to the present invention, first, in the motorcycle 10 equipped with the water-cooled engine 12, the radiator 75 has an inner side surface 75 a and an outer side surface 75 b as cooling surfaces. It is characterized by being arranged upright in a space 87 between the engine 12 and the rear wheel 16 so as to be directed substantially to the vehicle side.

  Since the radiator 75 is arranged in the space 87 between the engine 12 and the rear wheel 16, the radiator 75 can be made difficult to see from the outside as compared with the case where the radiator is arranged in the front part of the vehicle body frame. Therefore, the radiator 75 is difficult to be exposed to the outside, and the appearance of the motorcycle 10 can be improved because the engine 12 is not covered with the radiator 75 when the design of the engine 12 is enhanced.

Second, the present invention is characterized in that the radiator 75 is arranged on the left and right sides of the vehicle body.
Since the radiators 75 are arranged on the left and right sides of the vehicle body, the respective radiators 75 can be made small. Even when the space 87 is narrow, the radiator 75 can be easily and efficiently arranged, and the motorcycle 10 can be made compact. Miniaturization can be achieved.

  Thirdly, the present invention is characterized in that an exhaust duct 67 is provided in a side portion of the space 87 as described with reference to FIGS. 2 and 4, and air on the downstream side of the radiator 75 is discharged by the exhaust duct 67. .

  Since the exhaust duct 67 is provided at the side portion of the space 87, the amount of air passing through the radiator 75 can be increased in order to discharge the air downstream of the radiator 75 through the exhaust duct 67, and the cooling performance by the radiator 75 can be increased. Can be increased.

  In the fourth aspect of the present invention, as described with reference to FIGS. 3 and 4, a pair of left and right main frames 22 are extended rearward from the head pipe 21 that supports the front fork 27 in a steerable manner, and the inside of these main frames 22 is Each of the ducts is shaped to guide the traveling wind through the main frame 22 from the vicinity of the head pipe 21 to the space 87.

  With the duct-shaped main frame 22 inside, the amount of traveling airflow guided to the space 87 between the engine 12 and the rear wheel 16 can be increased, and water cooling by the radiator 75 can be promoted.

  In the fifth aspect of the present invention, as described with reference to FIGS. 4 and 8, the radiator 75 is attached to the seat rail 23 inside the pair of left and right seat rails 23, 23 attached to the rear portion of the main frame 22 in plan view. It is characterized by being arranged along.

  Since the radiator 75 is disposed along the seat rail 23 inside the pair of left and right seat rails 23 and 23 attached to the rear portion of the main frame 22 in plan view, the air passing through the radiator 75 can be efficiently flowed. In addition, the area of the cooling part can be secured while contributing to the downsizing of the left and right width of the motorcycle 10 (see FIG. 2), and the cooling performance by the radiator 75 can be enhanced.

  In the present invention, the main frame passing above the engine is a duct that guides the traveling wind to the space. However, the present invention is not limited to this, and a duct that guides the traveling wind to the space may be provided below the engine.

  The radiator arrangement structure of the present invention is suitable for a motorcycle.

1 is a perspective view of a motorcycle adopting a radiator arrangement structure according to the present invention. 1 is a side view of a motorcycle according to the present invention. 1 is a side view of a main part of a motorcycle according to the present invention. 1 is a plan view of a main part of a motorcycle according to the present invention. It is a perspective view explaining the body frame concerning the present invention. It is a 1st operation | movement figure which shows the effect | action of the radiator arrangement structure which concerns on this invention. It is a 2nd operation | movement figure which shows the effect | action of the radiator arrangement structure which concerns on this invention. It is explanatory drawing which shows another embodiment of the radiator arrangement | positioning structure which concerns on this invention.

DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 12 ... Engine, 16 ... Rear wheel, 21 ... Head pipe, 22 ... Main frame, 23 ... Seat rail, 24 ... Down pipe, 27 ... Front fork, 65 ... Side cover, 66 ... Intake duct, 67 Exhaust duct, 75 ... Radiator, 75a, 75b ... Cooling surface (inner side, outer side), 87 ... Space , 88 ... Center duct, 88a ... Front end, 88b ... Rear end, 95 ... Shroud .

Claims (6)

In a motorcycle equipped with a water-cooled engine,
The engine and the rear wheel are disposed along the seat rail inside the pair of left and right seat rails attached to the pair of left and right main frames extending rearward from the head pipe so that the cooling surface is directed to the side of the vehicle. Standing up in the space between and
A radiator arrangement structure for a motorcycle, wherein an intake duct and an exhaust duct are provided in a side cover located inside the seat rail and so as to cover a side of the radiator and the space . 2. The radiator arrangement structure for a motorcycle according to claim 1, wherein the radiator is arranged on each of the left and right sides of the vehicle body . By making the inside of the main frame into a duct shape,
The radiator arrangement structure for a motorcycle according to claim 1 or 2 , wherein traveling wind is guided to the space from the vicinity of the head pipe through the main frame. The radiator arrangement structure according to claim 1, wherein the intake duct is provided above a front portion of the side cover, and the exhaust duct is arranged below a rear portion of the side cover. A center duct is mounted between the left and right main frames, and a front end portion of the center duct is disposed between a pair of left and right down pipes extending substantially downward and rearward from the head pipe, and a rear end portion of the center duct is disposed in the space. 2. A radiator arrangement structure for a motorcycle according to claim 1, wherein the radiator arrangement structure is provided. The radiator arrangement structure for a motorcycle according to claim 1, wherein the rear side of the radiator is covered with a shroud, and the air flow in the space is changed and collected on the radiator side.

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