JPH0725343B2 - Motorcycle cooling system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device which guides traveling wind to a radiator of a motorcycle equipped with a water-cooled engine to efficiently cool the radiator.

[0002]

2. Description of the Related Art In a motorcycle equipped with a water-cooled engine, it is preferable to provide a radiator for cooling the engine cooling water at a position where traveling wind is well hit. In a conventional motorcycle of this type, the radiator is usually attached to the rear of the front wheel, that is, the down tube. However, in this position, the mud that the front wheels bounce off easily. Therefore, it is better to install the radiator as high as possible, but the part near the steering head pipe of the down tube has a mudguard on the front wheels in front of it, which makes it difficult for the running wind to hit directly and the running wind speed flowing through the radiator. Is reduced. As a result, there is a disadvantage that the radiator becomes large for the same amount of heat radiation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to reduce the size of the radiator by efficiently propelling the traveling wind to the radiator and preventing the mud from the front wheels from splashing on the radiator. An object of the present invention is to provide a cooling device for a motorcycle.

[0004]

[Means for Solving the Problems] Means taken for solving the above problems are constituted by the following elements (a) to (d). (A) An engraved portion is provided in front of the upper surface of the fuel tank, the front end of the tank is adjacent to the upper portion of the head pipe, and the rear of the engraved portion is an inclined lower surface,
These lower surfaces of the fuel tank are substantially inclined in the front-rear direction, and a pair of left and right radiators are vertically arranged with the tank rail interposed between the head pipe and the inclined lower surface of the fuel tank. The tip of the side plate provided with a window hole in the lateral direction is inclined to the outside in the left-right direction, the outer surface and the rear end surface of the radiator are covered by the side plate, the inclined portion is positioned substantially immediately after the radiator, and the tip of the side plate and the The front end of the radiator is adjacent to the steering head pipe, and (c) an air guide plate having an arcuate cutout at the center of the rear end is provided between the pair of left and right front forks, and the arcuate cutout has a head pipe. The front side of the baffle plate to extend the rear ends of the left and right sides of the baffle plate to the tip of the tank rail, and guide the traveling wind to the radiator by the baffle plate. (D) Connect the left and right radiators. Provided communicating pipe radiator upper to the the communicating pipe in a state of being positioned in the gouge portion, that disposed below the fuel tank radiator.

[0005]

[Operation] Since a wind guide plate is provided between the front forks and the traveling wind is guided by the wind guide plate to the radiator arranged behind the head pipe, the radiator can be arranged at a position relatively higher than the road surface. , The mud from which the front wheels bounce is less likely to adhere to the radiator, and the traveling wind is guided to the radiator by the baffle plate, and a sufficient amount of air hitting the radiator can be secured. The radiator has a great resistance to the flow of cooling air. The higher the flow velocity of the cooling air, the more drastically this resistance increases. Therefore, there is a strong tendency that the cooling wind hitting the front surface of the radiator blows upward and blows upward through the gap between the front end of the fuel tank and the head pipe. According to the present invention, the front end of the fuel tank is adjacent to the upper portion of the head pipe, and a baffle plate having an arcuate cutout at the center of the rear end is provided between the pair of left and right front forks, and By fitting the front face of the head pipe into the notch and extending the rear ends of both left and right sides of the baffle plate to the tip of the tank rail, and guiding the traveling wind to the radiator by the baffle plate, it is taken in by the left and right side plates. And
Since it is possible to prevent the cooling air guided toward the radiator by the baffle plate from blowing upward from between the rear surface of the head vibe and the tip of the fuel tank, it is possible to dramatically increase the amount of cooling air flowing toward the radiator. Furthermore, a cutout portion is provided in front of the lower surface of the fuel tank, a communication pipe for communicating the left and right radiators is provided at the upper end of the radiator, and the communication pipe is arranged in the above cutout portion in front of the lower surface of the fuel tank. The position can be made as high as possible, and therefore the running wind guided by the left and right side plates and guided by the baffle plate can be applied to the radiator from the front as much as possible, and further mud is prevented from hanging on the radiator. It can be reduced as much as possible.

[0006]

[Examples] The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied, FIG. 2 is a plan view of the same, FIG. 3 is a side view of a partial cross-section, and FIG. 4 is a sectional view taken along line AA in FIG. 5 is a perspective view of the air guide. Reference numeral 1 in FIG.
Reference numeral 0 denotes a steering head pipe, and the head pipe 10 includes a tank rail 12 and a down tube 14.
Is welded. 1 to 4, 16 is a water-cooled engine,
Reference numeral 18 (18a, 18b) is a pair of left and right radiators, and 20 is a fuel tank. As shown in FIGS. 3 and 4, the radiator 18 is fixed to the tank rail 12 and the down tube 14 by bolts 22 and 24 at a position slightly obliquely below and behind the head pipe 10. The fuel tank 20 has its tip as close as possible to the rear surface of the head pipe 10 and covers the radiator 18 from above. An inverted L-shaped cutout portion 20A is provided in front of the lower surface of the radiator 18, and a lower surface behind the cutout portion 20A of the lower surface is an inclined lower surface 20a which is inclined obliquely downward, and the stay 26 projects on the inclined lower surface 20a. It is set up. Radiator 1
A communicating pipe 30 for communicating the upper portions of the radiators 8a and 18b is located in the cutout portion, and the rear surfaces of the radiators 18a and 18b are separated from the inclined lower surface 20a of the fuel tank by a predetermined distance. The stay 26 and the stay 26 are fastened together by the bolts 22 and fixed to the tank rail 12. As a result, the radiators 18a and 18b are mounted at the highest possible position,
Its upper end is completely covered by the lower surface of the fuel tank 20. The cooling water of the engine 16 enters the bottom of the left radiator 18a by a pipe 28, and is cooled by the radiators 18a, 18b.
Enter the right radiator 18b through the upper communication pipe, and return to the engine from the lower portion of the right radiator 18b. 32 (3
2a, 32b) are side plates attached to the side surfaces of the radiators 18a, 18b. As shown in FIGS. 3 and 4, the side plate 32 includes brackets 34, 36 (36, 36) protruding from the radiator 18.
a, 36b) and the inclined lower surface 20a of the fuel tank 20.
It is attached to the bracket 38 protruding from the. The front end of the side plate 32 extends forward as is clear from FIGS. 2 and 4, so that the traveling wind can be easily taken in. The side plate 32 is bent rearward of the radiator 18 toward the center of the vehicle body, and a substantially triangular window hole 40 is formed near this bent portion (see FIGS. 1 and 4). The traveling wind that has passed through the radiator 18 is discharged through the window hole 40. 1 to 42 (42
a, 42b) are a pair of left and right front forks. The upper ends of the front forks 42 are attached to the left and right sides of the head pipe 10 via an upper bracket 44 and a lower bracket 46 so as to be freely rotatable. Reference numeral 48 is a steering handle fixed to the upper surface of the upper bracket 44, 50 is a front wheel attached to the lower end of the front fork 42, and 52 is a mudguard fixed to the lower bracket 46. Reference numeral 54 denotes an air guide, which is attached near the head pipe 10, that is, between the left and right front forks 42a and 42b sandwiched by the upper bracket 44 and the lower bracket 46. As shown in FIG. 5, the air guide 54 includes a pair of guide plates 56 (56a, 56b) having a semicircular cross section that are in close contact with the outer periphery of the front fork 42, and a plurality of air guide plates 58 that connect the guide plates 56. . An arcuate notch 60 is formed at the rear end of the baffle plate 58 to prevent interference with the head pipe 10. The wind guide 54 is mounted on the front fork 42 from above with the upper bracket 44 removed.
The guide plate 56 is pushed in by the elasticity of the plate 58 itself.
The inner surface of the portion having a circular cross section is pressed by the front fork 42. Then, if the upper bracket 44 is attached after that, the upper and lower end surfaces of the guide plate 56 are fixed to both brackets 44, 46.
And the vertical movement of the air guide 54 is restricted. Also,
As shown in FIG. 3, the plurality of baffle plates 58 are fixed to the guide plate 56 so that the rear ends thereof are oriented in the radiator 18 direction, and the rear ends on both sides thereof extend below the front end of the fuel tank. Due to this fact and the fact that the tip of the fuel tank is as close to the rear surface of the head pipe as possible, the baffle plate 58
Thus, the traveling wind directed to the radiator can be prevented from blowing upward through the gap between the head pipe and the tip of the fuel tank. Further, in this embodiment, the mesh-shaped number display plate 61 is positioned so as to be located in front of the air guide 54.
Are fixed to the brackets 44 and 46. In FIG. 1, 62 is a rear wheel, 64 is a seat, 66 is a mudguard of the rear wheel 62, and 68 is an exhaust silencer. Next, the operation of this embodiment will be described. During operation of the engine 16, the cooling water is cooled through the pipe 28, the left radiator 18a, the communication pipe 30, and the right radiator 18b, and then returns to the engine 16. During traveling, traveling wind hits the wind guide plate 58 through the net of the number display plate 61, and the flow direction of traveling wind changes obliquely downward. That is, the strong running wind that directly enters the relatively wide opening between the left and right front forks 42 and the two brackets 44, 46 increases the wind speed and hits the radiator 18 because the passage area is narrowed by the baffle plate 58. Since the side plate 32 is attached to the side surface of the radiator 18, the traveling wind guided by the baffle plate 58 surely passes through the radiator 18 without bypassing the radiator 18. The side plate 32 is the lower bracket 4
Since the traveling wind is taken in from below 6 and is guided to the radiator 18, the cooling performance of the radiator 18 is further improved. The traveling wind that has passed through the radiator 18 receives the side plate 32 and the fuel tank 20.
Is guided to the inclined lower surface 20a, and most of it is discharged from the window hole 40 of the side plate 32, while the rest is guided to the inclined lower surface 20a and flows below the tank 20. In this way, the radiator 18 is exposed to the traveling wind accelerated by the baffle plate 58, so that the heat exchange efficiency of the radiator 18 is improved. Therefore, the radiator can be downsized for the same amount of heat radiation. In the above embodiment, the baffle plate 58 is fixed to the guide plate 56 having a semicircular cross section, and the guide plate 56 is pressed against the steering fork 42 to fix the baffle 54.
The baffle plate 58 can be fixed without damaging the front fork 42 at all and without performing special processing on the brackets 44 and 46. Instead of the guide plate 56, it is possible to use a tube having a circular cross section and fix the air guide 54 so that the front fork 42 penetrates the tube. Further, when the number display plate 61 is attached to the front surface of the air guide 54 as in this embodiment, the number plate 58 is integrally provided with the number display plate 61, and the number display plate 6 is provided.
1 or the baffle plate 58 only one of the bracket 4
It may be fixed to 4, 46 or the front fork 42. Particularly, when the display plate 61 is fixed to the brackets 44 and 46 and the baffle plate 58 is fixed to the display plate 61, the guide plate 56 becomes unnecessary as in the above-described embodiment, which is suitable for weight reduction. Further, since the side plate 32 is attached to the side surface of the radiator 18, the amount of traveling air taken into the radiator is further increased, and the rear end of the baffle plate 58 and the front end of the fuel tank cause the traveling wind taken in by the side plate to move upward. Since blow-through can be prevented and a large amount of cooling air can be applied to the radiator, the cooling capacity of the radiator is improved. Further, the rear lower surface of the fuel tank that covers the upper portion of the radiator 18 is the inclined lower surface 20a that is inclined rearward, so that the baffle plate 58 is provided.
Since the traveling wind guided by and directed to the radiator is guided to the lower rear of the fuel tank by the inclined lower surface 20a behind the fuel tank, the traveling wind does not stay behind the radiator and the radiator passage resistance of the cooling air is reduced. It is low-depleted, and the amount of cooling air passing through the radiator can be increased accordingly. Further, an inverted L-shaped cutout portion 20A is provided in front of the lower surface of the fuel tank, and the communication pipe 30 at the upper end of the radiator is arranged in this cutout portion, whereby the mounting position of the radiator 18 can be made as high as possible.
As much as that, it is easy to guide the traveling wind to the front of the radiator, the traveling wind can be applied to the radiator at a right angle as much as possible, and a large amount of cooling air can pass through the radiator smoothly as much as that. It is possible to reduce the tendency that the mud splashed up by the front wheels adheres to the radiator and lowers its cooling capacity due to the higher mounting position of the.

[0007]

As described above, according to the present invention, the wind guide plate is provided between the pair of left and right front forks supported by the head pipe, and the traveling wind is guided by the wind guide plate to the radiator disposed behind the head pipe. That is, an arcuate notch is provided at the center of the rear end of the baffle plate, and the front end of the head pipe is fitted into the arcuate notch so that the rear ends of the left and right sides of the baffle plate are connected to the tank rail. By extending the wind to the radiator by extending it to the tip, the direction of the cooling air to the radiator is strengthened, and the gap between the fuel tank tip of the running wind and the rear surface of the head pipe of the cooling wind directed to the radiator. It is possible to suppress the upward blow-through from the air as much as possible, and thereby, it is possible to dramatically increase the amount of cooling air passing through the radiator. Further, by providing a cutout portion in front of the lower surface of the fuel tank and positioning the communication pipe at the upper end of the radiator in this cutout portion, the mounting position of the radiator can be set to a position as high as possible above the road surface,
As a result, a large amount of cooling air as described above can be applied to the radiator from the front as much as possible, so that the traveling wind smoothly passes through the radiator and the radiator passage flow velocity becomes high. Therefore, the cooling capacity of the radiator can be dramatically improved, and the radiator can be downsized. Further, as described above, since the mounting position of the radiator can be made as high as possible and the size can be reduced, the lower end position of the radiator is dramatically higher than the conventional one. . Therefore, it is possible to significantly reduce the tendency of the mud splashed up by the front wheels to adhere to the radiator, and it is possible to very effectively prevent the cooling capacity of the radiator from decreasing due to the adhesion of mud.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied.

FIG. 2 is a plan view of a motorcycle to which an embodiment of the present invention is applied.

FIG. 3 is a side view of the main part of the present invention, which is partially cross-sectional.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view of a wind guide.

[Explanation of symbols]

 10 ... Steering head pipe 16 ... Water-cooled engine 18 ... Radiator 20A ... Goug part 20a ... Sloping lower surface 30 ... Communication pipe 42 ... Front fork 58 ... Baffle plate 60 ... Arc-shaped notch

Claims (1)

[Claims] 1. A water-cooled engine is mounted near the center of the vehicle body,
In a motorcycle in which a fuel tank is arranged on one tank rail above this engine, a pair of left and right front forks are rotatably supported by a steering head pipe, and a front fender is attached to a lower bracket of the head pipe, An engraved portion is provided in front of the lower surface of the fuel tank, the front end of the tank is adjacent to the upper portion of the head pipe, and the rear surface of the engraved portion is an inclined lower surface. And, the tank rail is sandwiched between the head pipe and the inclined lower surface of the fuel tank, and a pair of left and right radiators are vertically arranged, and a tip of a side plate having a window hole in an intermediate inclined portion is laterally outward. The side surface is inclined, the outer side surface and the rear end surface of the radiator are covered by the side plate, and the inclined portion is positioned substantially immediately after the radiator. The tip of the plate and the tip of the radiator are adjacent to the steering head pipe, and a baffle plate having an arcuate cutout at the center of the rear end is provided between the pair of left and right front forks, and the head pipe is provided in the arcuate cutout. The front end of the baffle plate is fitted to extend the rear ends of the left and right sides of the baffle plate to the tip of the tank rail, and the baffle plate guides the traveling wind to the radiator, and the communication pipe that connects the left and right radiators is connected to the upper end of the radiator. A cooling device for a motorcycle, wherein the radiator is arranged below the fuel tank in a state where the communication pipe is located in the cutout portion.