JP4394554B2 - 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.

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

According to the first aspect of the present invention, in a motorcycle equipped with a water-cooled engine, a radiator is attached to a front part of a rear fender that covers the front and upper sides of the rear wheel and along a curved surface of the rear fender . It is characterized in that the traveling wind that has passed through the radiator is caused to flow into the space by the flow of air in the space between the rear wheel and the rear fender generated by the rotation .
By attaching the radiator to the front part of the rear fender, 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. Also, as in the prior art radiator gone from the front of the engine, as possible out to highlight the engine from the vehicle front or vehicle front oblique side.

The invention according to claim 2 is characterized in that an intake duct for taking in the traveling wind is provided in a space in front of the rear fender and behind the engine.
By providing an intake duct for taking in the running wind in the space between the rear fender and the engine, it becomes possible to guide a lot of running wind into the space. As a result, a large amount of traveling wind hits the radiator, and cooling of the cooling water by the radiator is further promoted.

The invention according to claim 3 extends between the head pipe obliquely downward and downward, and is formed between the left and right main frames with the rear end opened to the rear space by being formed hollow, and the rear of the left and right main frames. A center duct having an end opened to a rear space and an intake duct formed on a side cover that covers the rear space are provided.

The invention according to claim 4 is characterized in that the lower end of the rear fender extends to the lower end of the engine in a side view, and the radiator is erected from the lower end.

The invention according to claim 5 is characterized in that the rear wheel is pivotally supported at the rear end of the triangular swing arm in side view, and the radiator is disposed in a region surrounded by the swing arm in side view.

In the invention according to claim 1, since the radiator is attached to the front part of the rear fender, the radiator can be made less visible from the outside as compared with the case where the radiator is arranged at the front part of the vehicle body frame. Therefore, it is difficult for the radiator to be exposed to the outside, and the engine is not covered with the radiator when the design of the engine is enhanced, so that the design of the engine can be fully demonstrated and the appearance of the motorcycle is improved. as possible out it is.

In the invention according to claim 2 , since the intake duct for taking in the traveling wind is provided in the space in front of the rear fender and behind the engine, a larger amount of traveling wind is generated in the space between the engine and the radiator by the intake duct. Thus, water cooling by the radiator can be further promoted.

In the invention according to claim 3, it is attached between the left and right main frames and the pair of left and right main frames which extend rearward and obliquely downward from the head pipe and are formed hollow so that the rear end portion is opened in the rear space. A center duct having an end opened to the rear space and an intake duct formed on a side cover covering the rear space are provided.

In the invention according to claim 4, the lower end of the rear fender extends to the lower end of the engine in a side view, and the radiator is arranged to stand up from the lower end.

In the invention according to claim 5, the rear wheel is pivotally supported at the rear end of the triangular swing arm in side view, and the radiator is disposed in a region surrounded by the swing arm in side view.

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 can be given to the appearance of the rear wheel 16 and the appearance can be improved.

  The space between 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. A space formed inside the pivot plate 26 in front of the radiator and behind the power unit 14. Both sides were covered with side covers 65, and intake ducts 66 were respectively provided on these side covers 65.

  FIG. 3 is a side view of the main part of the motorcycle according to the present invention (the arrow (FRONT in the figure indicates the front of the vehicle)), and the vehicle body frame 11 and the power unit 14 are mainly shown on the left side thereof, and the rear fender 47 It shows that the radiator 75 is attached to the lower part of the front part. That is, it shows that the radiator 75 is disposed in the space 87 between the engine 12 and the rear wheel 16, more specifically, between the power unit 14 and the rear wheel 16.

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 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 perspective view showing the radiator and the rear fender according to the present invention, and shows that the radiator 75 is attached to the front portion of the rear fender 47 integrally and along the curved surface of the rear fender 47. In this way, by bringing the radiator 75 along the curved surface of the rear fender 47, a sense of unity between the radiator 75 and the rear fender 47 is strengthened, and for example, the radiator 75 can be made inconspicuous in a side view.

  FIG. 5 is a plan view of the main 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 22 b of the main frames 22, 22 and the center duct 88 are arranged. 22b, 88b are aligned, seat rails 23, 23 are attached to the left and right main frames 22, 22, respectively, a radiator 75 is disposed between the seat rails 23, 23 in plan view, and the seat rails 23, 23 in plan view are arranged. 23 shows that the air intake ducts 66 are attached to the side covers 65 and 65 located inside 23, respectively. A space 87 is located inside the left and right side covers 65, 65. In addition, 91 is a cross member attached between the left and right seat rails 23, 23, and 46 is a seat.

6 (a) and 6 (b) 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. 7 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. 8 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 from the main frames 22 and 22 and the center duct 88 into the space 87, and further flows from the side of the vehicle body into the space 87 through the left and right intake ducts 66 and 66. The radiator 75 can be cooled by passing through.

FIG. 9 is a third action diagram showing the action of the radiator arrangement structure according to the present invention.
While the vehicle is traveling, the rear wheel 16 rotates in the direction of the white arrow, so that an air flow as indicated by the dashed arrow is present in the space 107 between the outer peripheral surface of the rear wheel 16 and the rear fender 47. Since this occurs, the pressure in the space 107 is lower than the surroundings due to this flow.

  Therefore, the flow of the traveling wind passing through the radiator 75 into the space 107 is promoted by the space 107 where the pressure is reduced, and as a result, the amount of traveling wind passing through the radiator 75 is increased and the cooling performance by the radiator 75 is improved. Can do.

  As described above with reference to FIGS. 3 to 5, the present invention firstly relates to the radiator 75 in the motorcycle 10 (see FIG. 2) on which the water-cooled engine 12 is mounted. It is attached to the front part of the rear fender 47 to cover.

  Since the radiator 75 is attached to the front portion of the rear fender 47, it is possible to make the radiator 75 less visible from the outside as compared with the case where the radiator is disposed at the front portion of the vehicle body frame. Therefore, the radiator 75 is not easily exposed to the outside, and the engine 12 is not covered with the radiator 75 when the design of the engine 12 is enhanced. The appearance of 10 can be improved.

Second, the present invention is characterized in that the radiator 75 is shaped along the curved surface of the rear fender 47.
Since the radiator 75 has a shape along the curved surface of the rear fender 47, the radiator 75 can be made inconspicuous in a side view, and the appearance of the motorcycle 10 can be further improved.

Thirdly, the present invention is characterized in that an intake duct 66 for taking in the running wind is provided in a space 87 ahead of the rear fender 47 and behind the engine 12.
Since the intake duct 66 for taking in the traveling wind is provided in the space 87 between the rear fender 47 and the engine 12, a larger amount of traveling wind can be guided to the space 87 between the engine 12 and the radiator 75 by the intake duct 66. In addition, water cooling by the radiator 75 can be further promoted.

  In the present embodiment, as shown in FIG. 5, one radiator 75 is provided at the front part of the rear fender 47. However, the present invention is not limited to this. The radiator 75 may be provided so as to extend substantially in the vehicle front-rear direction.

  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. It is a perspective view showing a radiator and a rear fender 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 a 3rd operation | movement figure which shows the effect | action of the radiator arrangement structure which concerns on this invention.

DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 12 ... Engine, 16 ... Rear wheel, 21 ... Head pipe, 22 ... Main frame, 22b ... Rear end part, 28 ... Swing arm, 47 ... Rear fender, 65 ... Side cover, 66 ... Intake duct, 75 ... Radiator , 87 ... Back space, 88 ... Center duct, 88b ... Rear end, 107 ... Space .

Claims (5)

In a motorcycle equipped with a water-cooled engine,
The radiator is attached to the front part of the rear fender that covers the front and top of the rear wheel, and along the curved surface of the rear fender ,
A radiator arrangement structure for a motorcycle, wherein a traveling wind that has passed through the radiator is caused to flow into the space by a flow of air in a space between the rear wheel and the rear fender generated by rotation of the rear wheel . Radiator arrangement structure for a motorcycle according to claim 1 Symbol mounting, characterized in that a suction duct for taking travel wind into the space behind the said engine a vehicle front than the rear fender. A pair of left and right main frames that extend diagonally downward from the head pipe and are hollow so that the rear ends are opened in the rear space, and are attached between the left and right main frames, and the rear ends are opened in the rear space. The radiator arrangement structure for a motorcycle according to claim 1 or 2, further comprising: a center duct that is made to pass through, and an intake duct formed on a side cover that covers the rear space. The radiator arrangement structure for a motorcycle according to claim 1, wherein a lower end of the rear fender extends to a lower end of the engine in a side view, and the radiator is arranged to stand up from the lower end. The motorcycle according to claim 1, wherein the rear wheel is pivotally supported at a rear end of a swing arm having a triangular shape in a side view, and the radiator is disposed in a region surrounded by the swing arm in a side view. Radiator arrangement structure.

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