JP2006096261A - Radiator arrangement structure of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the appearance of a motorcycle by improving the radiator arrangement structure of the motorcycle and to ensure the same cooling performance by the radiator.
In a motorcycle in which a rear wheel 16 is belt-driven by a water-cooled engine 12, a radiator 75 is disposed in a space 87 between the engine 12 and the rear wheel 16, and the engine 12 is disposed in front of the radiator 75. The rear of the radiator 75 is covered with the rear wheel 16, the cooling fan 111 is rotated by the driving force of the toothed belt 116, and the radiator 75 is forcibly cooled by the cooling fan 111.
[Selection] Figure 3

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 side of the vehicle or from the diagonally forward side of the vehicle.

  Therefore, for example, when the radiator is provided inside the vehicle body, the cooling performance may be deteriorated, and the same cooling performance as when the radiator is provided between the left and right down pipes 33 in front of the engine 9 is ensured. There is a need to.

  Accordingly, an object of the present invention is to improve the appearance of the motorcycle by improving the radiator arrangement structure of the motorcycle, and to ensure the cooling performance by the radiator equivalent to the conventional one.

  The invention according to claim 1 is a motorcycle in which a rear wheel is belt-driven by a water-cooled engine, a radiator is disposed in a space between the engine and the rear wheel, and a cooling fan is rotated by a belt driving force. The radiator is cooled by a cooling fan.

  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.

  Further, since the cooling fan is rotated by the driving force of the belt and the radiator is forcibly cooled by the cooling fan, the cooling performance of the radiator equivalent to that provided near the front portion of the vehicle body frame can be maintained.

The invention according to claim 2 is characterized in that the cooling fan is connected to a rotating shaft of a belt tensioner for tensioning the belt.
By connecting the cooling fan to the rotating shaft of the belt tensioner for stretching the belt, no special power such as an electric motor for driving the cooling fan is required. Further, the cooling capacity of the cooling fan is small when the belt tensioner rotates at a low speed, and the cooling capacity of the cooling fan increases when the belt tensioner is at a high speed.

The invention according to claim 3 is characterized in that a shroud is provided around the cooling fan.
By providing the shroud around the cooling fan, an air flow is efficiently generated by the cooling fan.

The invention according to claim 4 is characterized in that the radiator is provided on a swing arm that supports the rear wheel so that the rear wheel can swing up and down, and the cooling fan is provided between the radiator and the rear wheel.
By providing the radiator on the swing arm, the positional relationship between the radiator and the rear wheel can be kept constant, and the radiator can be cooled by always using the air flow caused by the rotation of the rear wheel. Furthermore, by providing the cooling fan between the radiator and the rear wheel, the air flow described above is strengthened.

  The invention according to claim 5 is characterized in that traveling wind is introduced into the radiator from an intake duct provided in the vehicle body, and the traveling wind is blown to the rear of the radiator by a cooling fan to be discharged downward of the vehicle body.

  The traveling wind is introduced from the intake duct into the radiator, sent to the rear of the radiator by the cooling fan, and discharged to the lower side of the vehicle body, so that a path for the traveling wind to flow is ensured and the cooling fan can prompt the blowing of the path.

  In the invention according to claim 1, since the radiator is disposed in the space between the engine and the rear wheel, the front of the radiator can be covered with the engine, the rear of the radiator can be covered with the rear wheel, and the radiator It becomes difficult to see from the front-rear direction of the vehicle, and the appearance of the motorcycle can be improved.

  In addition, the cooling fan is rotated by the driving force of the belt, and the radiator is forcibly cooled by this cooling fan. Therefore, even if the radiator is located inside the vehicle body, it is equivalent to the case where it is provided near the front part of the vehicle body frame. The cooling property can be ensured.

  In the invention according to claim 2, since the cooling fan is connected to the rotating shaft of the belt tensioner for stretching the belt, no special power such as an electric motor for driving the cooling fan is required, and the cost of the motorcycle is increased. Can be suppressed. Further, the cooling capacity of the cooling fan can be changed according to the rotation speed of the belt tensioner.

  In the invention according to claim 3, since the shroud is provided around the cooling fan, the air flow can be efficiently generated by the cooling fan, the amount of air passing through the radiator can be increased, and the radiator is cooled. Cooling performance can be improved.

  In the invention according to claim 4, since the radiator is provided on the swing arm and the cooling fan is provided between the radiator and the rear wheel, the positional relationship between the radiator and the rear wheel can be kept constant, and the rotation of the rear wheel can be maintained. Thus, the radiator can be cooled by always using the air flow, and the heat radiation of the radiator can be promoted. Furthermore, the above-described air flow can be strengthened by the cooling fan, and the heat radiation of the radiator can be further promoted.

  In the invention according to claim 5, since the traveling wind is introduced from the intake duct to the radiator, sent to the rear of the radiator by the cooling fan, and discharged to the lower part of the vehicle body, a path for the traveling wind to be ensured and the ventilation of the path is cooled. It can be urged by the fan, the amount of traveling airflow hitting the radiator can be increased, and the cooling performance by the radiator can be enhanced.

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 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 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 is 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. In addition, the cooling fan 111 and the fan driving device 112 disposed inside the side cover 65 with a part of the side cover 65 broken are illustrated.

The power unit 14 includes a water pump (not shown) on the side surface of the crankcase 71. The water pump circulates the cooling water in the water jacket of the engine 12 to the radiator 75 to cool the cooling water.
In the figure, reference numeral 111 denotes a cooling fan disposed close to the rear of the radiator 75 in order to cool the radiator 75, and 112 denotes a fan driving device that drives the cooling fan 111.

The radiator 75 is a rectangular flat plate-like component that is attached to the left and right pivot plates 26 and disposed between the left and right pivot plates 26. The radiator 75 is disposed so that the front and rear surfaces extend in the vehicle width direction, and the upper portion is lower than the lower portion. Is also tilted so that it is located behind the vehicle.
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 radiator 75 may be attached to the swing arm 28, and in that case, the shroud that covers the periphery of the radiator 75 and the rear fender 47 may be integrally formed.

  FIG. 4 is a perspective view for explaining a driving force transmission mechanism according to the present invention. A driving pulley 113 is attached to the output shaft 13a (see FIG. 3) of the transmission 13 and is integrated with the rear wheel 16 (see FIG. 3). A driven pulley 114 is attached, and a toothed belt 116 is stretched over the driving pulley 113 and the driven pulley 114, and a predetermined tension is applied to the toothed belt 116 by a tension pulley 117 as a belt tensioner.

Thereby, the driving force of the engine 12 is transmitted to the rear wheel 16 through the transmission 13, the output shaft 13a, the driving pulley 113, the toothed belt 116, and the driven pulley 114.
The intake duct 66 is attached to the side cover 65.

FIG. 5 is a cross-sectional view showing a fan driving device according to the present invention. The fan driving device 112 includes a case 121 attached to the left and right pivot plates 26 (see FIG. 3), and bearings 122 and 122 attached to the case 121. A pulley shaft 123 mounted rotatably, a tension pulley 117 splined to one end of the pulley shaft 123, a small bevel gear 124 splined to the other end of the pulley shaft 123, and a large meshing with the small bevel gear 124. It consists of a bevel gear 126 and a support shaft 127 that supports the large bevel gear 126 by spline coupling and is connected to the cooling fan 111.
Here, 131 and 132 are collars, 133 is a retaining ring, 134 and 134 are bearings for rotatably supporting the support shaft 127 on the case 121, and 136 is a retaining ring.

Next, the operation of the radiator arrangement structure described above will be described.
When the operation of the engine is started and the driving force is transmitted from the transmission to the rear wheel via the toothed belt 116, the tension pulley 117 rotates accordingly.

Thereby, the rotation of the tension pulley 117 is transmitted to the small bevel gear 124 via the pulley shaft 123, and is transmitted from the small bevel gear 124 to the large bevel gear 126. As a result, the support shaft 127 that supports the large bevel gear 126 rotates, the cooling fan 111 rotates, and the air in the space 87 is forced to flow to the rear of the vehicle through the radiator 75.
In addition to the traveling wind from the front of the radiator 75, the traveling wind also enters from the intake duct 65 into the space 87, so that it is possible to secure an air volume for cooling the radiator 75.

  The case 121 described above may be attached to the swing arm 28 (see FIG. 3). In this case, the positional relationship between the tension pulley 117 on the case 121 side and the toothed belt 116 is kept constant.

FIGS. 6A and 6B are operation diagrams for comparing the operations of the belt tensioners.
(A) shows a comparative example. Since the driving pulley 113 rotates in the direction of arrow A and the driven pulley 114 rotates in the direction of arrow B, the upper side of the toothed belt 116 is the tension side 116a and the lower side is the loose side 116b. In this comparative example, a tension pulley 217 is provided on the tension side 116 a of the toothed belt 116.

(B) is an example (this embodiment). In the present invention, a tension pulley 117 is provided on the loose side 116b of the toothed belt 116.
For example, when no tension pulley is provided, play occurs on the loose side 116b as compared to the tension side 116a.

  In the present invention, since the tension pulley 117 is provided on the loose side 116b, the occurrence of play on the loose side 116b of the toothed belt 116 can be suppressed as compared with the comparative example shown in FIG.

  Further, for example, when an external load is applied to the cooling fan 111 (see FIG. 5) and an overload is applied in a state where the tension pulley 117 is stopped or nearly stopped, the toothed belt 116 rotating at a high speed. And the tension pulley 117 can be prevented from slipping, and an overload can be prevented from acting on the toothed belt 116.

  3 and 6B, since the tension pulley 117 is attached to the left and right pivot plates 26 through the case 121 (see FIG. 5), the toothed belt 116 moves up and down as the swing arm 28 moves up and down. Even if it moves, since the tension pulley 117 is provided on the loose side 116b, the state in which the toothed belt 116 is always in contact with the tension pulley 117 can be maintained.

  FIG. 7 is an explanatory view showing another embodiment of the radiator cooling structure according to the present invention, and shows that a cooling fan 141 is arranged behind the radiator 75 and the periphery of the cooling fan 141 is covered with a shroud 142.

  Thus, by covering the periphery of the cooling fan 141 with the shroud 142, it is possible to efficiently blow air by the cooling fan 141, increase the amount of air passing through the radiator 75, and cooling performance for cooling the radiator 75. Can be further enhanced.

  As described above with reference to FIG. 3, the present invention firstly relates to the radiator 75 in the motorcycle 10 (see FIG. 2) in which the rear wheel 16 is belt-driven by the water-cooled engine 12, and the engine 12 and the rear wheel 16. The cooling fan 111 is rotated by the driving force of the toothed belt 116, and the radiator 75 is cooled by the cooling fan 111.

  Since the radiator 75 is disposed in the space 87 between the engine 12 and the rear wheel 16, the front of the radiator 75 can be covered with the engine 12, and the rear of the radiator 75 can be covered with the rear wheel 16. Becomes difficult to see from the front-rear direction of the vehicle, and the appearance of the motorcycle 10 can be improved.

  Further, since the cooling fan 111 is rotated by the driving force of the toothed belt 116 and the radiator 75 is forcibly cooled by the cooling fan 111, even if the radiator 75 is located on the inner side of the vehicle body, in the vicinity of the front portion of the vehicle body frame. The cooling performance of the radiator 75 equivalent to the case where it is provided can be ensured.

  Secondly, the present invention is characterized in that the cooling fan 111 is connected to the rotating shaft of a tension pulley 117 as a belt tensioner for tensioning the toothed belt 116, that is, the pulley shaft 123, as described in FIG. And

  Since the cooling fan 111 is connected to the pulley shaft 123 of the tension pulley 117 for tensioning the toothed belt 116, no special power such as an electric motor for driving the cooling fan 111 is required, and the motorcycle 10 (FIG. 2). Cost) can be suppressed. Further, the cooling capacity of the cooling fan 111 can be changed according to the number of rotations of the tension pulley 117.

Third, the present invention is characterized in that a shroud 142 is provided around the cooling fan 141 as described with reference to FIG.
Since the shroud 142 is provided around the cooling fan 141, the air flow can be efficiently generated by the cooling fan 141, the amount of air passing through the radiator 75 can be increased, and the cooling performance for cooling the radiator 75 can be improved. Can be improved.

  In the fourth aspect of the present invention, in FIG. 3, the radiator 75 is provided on the swing arm 28 that supports the rear wheel 16 so as to freely swing up and down, and the cooling fan 111 is provided between the radiator 75 and the rear wheel 16. Features.

  Since the radiator 75 is provided on the swing arm 28 and the cooling fan 111 is provided between the radiator 75 and the rear wheel 16, the positional relationship between the radiator 75 and the rear wheel 16 can be kept constant, and the rotation of the rear wheel 16 can be maintained. Therefore, the radiator 75 can be cooled by always using the air flow, and the heat radiation of the radiator 75 can be promoted. Further, the cooling fan 111 can increase the above-described air flow, and can further promote the heat radiation of the radiator 75.

  In the fifth aspect of the present invention, as shown in FIGS. 3 and 5, running wind is introduced into the radiator 75 from the intake duct 66 provided in the vehicle body, and the running wind is blown rearward of the radiator 75 by the cooling fan 111. Then, the vehicle is discharged downward by the rotation of the rear wheel 16.

  The traveling wind is introduced from the intake duct 66 to the radiator 75, sent to the rear of the radiator 75 by the cooling fan 111, and discharged to the lower side of the vehicle body by the rotation of the rear wheel 16, so that a path for the traveling wind to flow is secured and the ventilation of the path Can be encouraged by the cooling fan 111, the amount of traveling airflow hitting the radiator 75 can be increased, and the cooling performance by the radiator 75 can be enhanced.

  In the embodiment shown in FIG. 5, a shroud that covers the periphery of the cooling fan 111 may be provided.

  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 explaining the driving force transmission mechanism which concerns on this invention. It is sectional drawing which shows the fan drive device which concerns on this invention. It is an operation | movement figure which compares the effect | action of a belt tensioner. It is explanatory drawing which shows another embodiment of the radiator cooling structure which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 12 ... Engine, 16 ... Rear wheel, 66 ... Intake duct, 75 ... Radiator, 87 ... Space, 111, 141 ... Cooling fan, 116 ... Belt (toothed belt), 117 ... Belt tensioner (tension pulley) ), 123... Rotating shaft (pulley shaft), 142.

Claims (5)

In a motorcycle with a belt-driven rear wheel with a water-cooled engine,
A radiator arrangement structure for a motorcycle, wherein a radiator is arranged in a space between the engine and a rear wheel, a cooling fan is rotated by a driving force of the belt, and the radiator is cooled by the cooling fan.   The radiator arrangement structure of the motorcycle according to claim 1, wherein the cooling fan is connected to a rotation shaft of a belt tensioner for stretching the belt.   3. A radiator arrangement structure for a motorcycle according to claim 1, wherein a shroud is provided around the cooling fan.   The said radiator is provided in the swing arm which supports the said rear wheel so that an up-and-down swing is possible, and the said cooling fan is provided between a radiator and a rear wheel, The claim 1 or Claim 2 characterized by the above-mentioned. 3. A radiator arrangement structure for a motorcycle according to 3.   5. The radiator according to claim 1, wherein the radiator introduces traveling air from an intake duct provided in a vehicle body, blows the traveling air to the rear of the radiator by the cooling fan, and discharges the air downward. A radiator arrangement structure for a motorcycle according to any one of the preceding claims.

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