JP2632545B2 - Radiator cooling device for motorcycles, etc. - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a cooling device for a radiator provided in front of an engine of a motorcycle or a motorcycle (hereinafter, simply referred to as a motorcycle or the like).

(Prior art)

In motorcycles equipped with a water-cooled engine, to improve the cooling efficiency of the radiator placed in front of the engine, both sides of the radiator are extended in the horizontal direction, and the wind on both sides of the radiator is cut off from the front of the cowling. There has been proposed an extension of the introduction guideway, which is again extended to the lateral side of the cowling via the discharge guideway. (See Japanese Patent Application Laid-Open No. 63-8806) Conventionally, a cowling provided with the above-described traveling wind introduction guideway has been designed such that the cross-sectional area of the guideway is substantially the same in the longitudinal direction. . However, according to the results of various studies conducted by the inventor, it has been found that the amount of traveling air flowing into the introduction guideway having the above structure cannot be increased indefinitely and is limited by the ventilation resistance of the radiator. That is, it was found that the utilization rate at which the traveling wind could pass through the radiator was limited to about 50%, and the rest was pushed back from the opening and overflowed to the outside. In addition, when the area of the opening is increased to compensate for the shortage of the air flow, the air resistance of the cowling is increased accordingly, which causes another problem that the aerodynamic performance of the cowling is reduced. I understand.

[Object of the invention]

An object of the present invention is to provide a radiator cooling device for a motorcycle or the like that can increase the utilization rate of traveling wind without sacrificing aerodynamic performance by cowling, thereby improving cooling efficiency. .

[Configuration of the invention]

In order to achieve the above object, the present invention provides a radiator that extends left and right in front of an engine, covers the front of the radiator with a cowling together with a vehicle body, and a central portion of the cowling extends from a central opening of a front surface located behind a front wheel to a center of the radiator. Forming a central introduction guideway for the traveling wind reaching the front of the vehicle, and forming side introduction guideways for the traveling wind from the side opening of the front to the radiator side front on both sides of the central introduction guide; In a motorcycle or the like having a discharge guide path extending from the rear side of the radiator side to the lateral side surface of the cowling, the radiator is formed in a V-shape in which the shape in plan is inclined forward toward both sides, and both sides are engine front ends. The thickness of the core before and after the radiator is made thicker on both sides, and thinner at the center located behind the front wheel than on both sides. The front surface of the cowling is formed closer to the front wheel as it goes forward in plan view than the radiator, the side opening is provided near the front wheel side of the front surface of the cowling, and the side introduction guideway is traversed. The area is formed so as to gradually increase toward the outside of the vehicle body from the side opening toward the radiator side front surface.

 Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

FIG. 3 shows a motorcycle equipped with a radiator cooling device according to the present invention, wherein 1 is a frame, 2 is this frame 1
Front and rear V-type water-cooled engine mounted on
4 rear wheels. A radiator 5 for cooling engine cooling water is disposed in front of the water-cooled engine 2.
Further, the front side thereof is covered by the cowling 6 together with the vehicle body.

As shown in FIGS. 1 and 2, the radiator 5 is formed in a V-shape whose plan view is inclined forward at both sides 5 s, 5 s, and both sides 5 s, 5 s are both ends of the front end 2 a of the engine 2. It is shaped to protrude more laterally. Also,
The core thickness of the radiator 5 is large at both sides 5s, 5s, and thinner toward the center 5c. That is,
The radiator 5 has a large amount of engine cooling water flowing in the center at both sides 5s, 5s, but a small amount at the center 5c, and the traveling wind passing through the radiator 5 back and forth for heat exchange. (Cooling air) ventilation resistance on both sides
It is large in 5s and 5s, but small in the central part 5c. The radiator 5 has a V-shape in which three front surfaces 5A are connected to each other, and a rear surface 5B has a central portion.
5c is formed in a step shape, and a line connecting the tops x of the steps is substantially straight in the vehicle width direction.

The cowling 6 is made of resin and has a central introduction guideway 9 for traveling wind extending from the central opening on the front surface located behind the front wheel 3 to the front surface of the central portion 5c of the radiator 5 at the center. Running wind is applied to both sides of the radiator 5 on both sides 5s, 5
Side introduction guide paths 7, 7 for introducing into s, and discharge guide paths 8, 8 for discharging outward from the side introduction guide paths 7, 7, are formed. Cowling 6
The front surface 6a is formed so as to be closer to the front wheel 3 as it goes forward in plan view from the front of the radiator 5. The side introduction guideway 7 has a side opening 7a in front of the cowling 6 close to the front wheel 3, and its cross-sectional area gradually expands to the outside of the vehicle body as it goes backward using the shape of the cowling 6. The rear end is opposed to the front surface of the side portion 5s of the radiator 5.

On the other hand, the discharge guide path 8 is formed such that the opening 8a at the front end faces the back of the side portion 5s of the radiator 5, the cross-sectional area thereof is gradually reduced toward the rear, and the rear end is cut off obliquely. To the side of the cowling 6.

When the above-described motorcycle is run, the running wind enters through the openings 7a, 7a provided on both sides of the cowling 6 and passes through the side portions 5s, 5s of the radiator 5 through the side introduction guideways 7, 7 to the rear side. I do. During the passage, heat exchange is performed, and the discharge guideway 8,
After 8 it is discharged outside the cowling. The traveling wind also enters the central portion from the central introduction guideway 9 located behind the front wheel 3 at the central portion of the cowling 6, and heat exchange is performed when the traveling wind passes through the central portion 5c of the radiator 5.

Among the traveling winds described above, the wind entering the side introduction guideway 7 gradually reduces the flow velocity according to Bernoulli's law because the cross-sectional area of the guideway gradually increases toward the rear from the opening 7a. At the same time, increase the pressure (static pressure). Accordingly, the ventilation efficiency with respect to the radiator 5 is improved by the increased pressure, so that a larger amount of traveling wind can be passed as compared with the above-described conventional device having a constant cross-sectional area, thereby improving the cooling efficiency. Can be. Further, since the improvement of the cooling efficiency can be achieved without enlarging the opening 7a, the aerodynamic performance of the cowling 6 does not decrease.

On the other hand, the cross-sectional area of the discharge guide passage 8 may be constant in the longitudinal direction. However, if the cross-sectional area is gradually reduced toward the rear as in the above-described embodiment, the flow velocity increases toward the rear. Therefore, the discharged wind can be smoothly discharged to the high-speed airflow flowing along the side surface of the cowling. Therefore, the introduction and discharge of the traveling wind to the radiator can be made more efficient.

If the radiator 5 is configured such that the core thickness is large at both sides 5s and 5s and small at the center 5c as in the above-described embodiment, the high-pressure running is performed at both sides 5s and 5s having a large ventilation resistance. Since the wind is passed through and the traveling wind whose pressure is weakened by the front wheels 3 is passed through the central portion 5c having small ventilation resistance, the cooling efficiency of the radiator as a whole can be further improved. Also, in this case,
As shown in FIG. 1, if the radiator 5 is formed in a V-shape in which the both sides 5s, 5s are inclined in a plan view, the passing area of the traveling wind can be increased without unnecessarily widening the vehicle width, and The side introduction guide path 7 is expanded outward from the vehicle body from the side opening 7a toward the front of the radiator side section 5s, and a discharge guide path 8 is provided from the rear side of the radiator side section 5s to the lateral side of the cowling 6. Therefore, the traveling wind introduced from the side opening 7a is turned to the outside of the vehicle body by the side introduction guideway 7, passes through the radiator side 5s arranged obliquely, and from the discharge guideway 8 to the cowling side surface. Smooth discharge contributes to improvement of cooling efficiency.

Also, since the radiator 5 is formed in a V-shape in which the both sides 5s, 5s are inclined forward in a plan view, and the both sides 5s, 5s protrude laterally from both sides of the front end 2a of the engine,
Even if the core thickness of the side portions 5s, 5s is increased, it does not interfere with the engine 2, so that the wheelbase can be shortened.

〔The invention's effect〕

As described above, in the present invention, the cross-sectional area of the side introduction guideway is formed so as to gradually increase from the side opening toward the radiator side front surface, so that compared with the conventional cross-sectional area having the same cross-sectional area. The pressure (static pressure) of the traveling wind introduced into the side introduction guide path can be increased. Therefore, a large amount of traveling wind can be passed through the radiator without making the opening large, and the cooling efficiency can be improved without sacrificing the aerodynamic performance of the cowling.

Also, while the high-speed traveling wind passes on both sides, the core thickness is increased to increase ventilation resistance, while the central part, where the pressure is weakened by the front wheels, is reduced to reduce ventilation resistance, so cooling as a whole radiator Efficiency can be further improved.

Further, since the radiator has a V-shaped plan view, the passage area of the traveling wind can be increased without increasing the width of the vehicle body. Moreover, while the side introduction guideway is expanded from the side opening toward the radiator side front to the outside of the vehicle body, a discharge guideway is formed from the radiator side back to the lateral side of the cowling, so that the side opening guideway is formed. The traveling wind introduced from is redirected to the outside of the vehicle body by the side introduction guideway, passes through the radiator side that is arranged diagonally, and is smoothly discharged from the discharge guideway to the side surface of the cowling, so cooling Efficiency can be further improved.

Also, while the radiator has a V-shaped shape which is inclined forward as both sides of the radiator in a plan view shape, the both sides are made to project sideways from both sides of the front end of the engine, so that the thickness of both sides is increased. Also does not interfere with the engine, so that the wheelbase can be shortened.

[Brief description of the drawings]

1 shows a motorcycle equipped with a radiator cooling device according to an embodiment of the present invention. FIG. 1 is a sectional view taken along the line II of FIG. 3, FIG. 2 is a sectional view taken along the line II of FIG. FIG. 3 is a side view of the motorcycle. 1 ... frame, 2 ... water-cooled engine, 2a ... front end,
5 ... radiator, 5A ... front, 5B ... back, 5c ... central part, 5s ... side part, 6 ... cowling, 6a ... front, 7
... side introduction guideway, 7a ... opening, 8 ... discharge guideway, 9 ... central introduction guideway, X ... top.

Claims (2)

(57) [Claims] A radiator extending left and right is disposed in front of the engine, the front of the radiator is covered with a cowling together with a vehicle body, and a central portion of the cowling extends from a central opening of a front surface located behind a front wheel to a front surface of a central portion of the radiator. A central introduction guideway for traveling wind is formed, and a lateral introduction guideway for traveling wind from a side opening on a front surface to a front surface on a radiator side is formed on both sides of the central introduction guideway, and a radiator side rear surface is formed. In a motorcycle or the like having a discharge guide path formed so as to escape from the side surface of the cowling, the radiator is formed in a V-shape in which the shape in a plan view is inclined forward toward both sides, and both sides of the radiator are closer to both ends than the front end of the engine. The radiator is formed so that the core thickness before and after the radiator is thicker on both sides and thinner at the center located behind the front wheel than on both sides, and the front surface of the cowling is The front side of the cowling is formed closer to the front wheel as it goes forward in plan view, the side opening is provided near the front wheel side of the front surface of the cowling, and the cross-sectional area of the side introduction guideway is reduced by the side. A radiator cooling device for a motorcycle or the like, wherein the radiator cooling device has a shape that gradually expands toward the outside of the vehicle body from the opening portion to the radiator side front surface. 2. A patent wherein the radiator has a V-shape with a continuous front surface, a rear surface having a stepped central portion, and a line connecting the tops of the steps being substantially straight in the vehicle width direction. A radiator cooling device for a motorcycle or the like according to claim 1.