JPH0710060A - Cooling device of motorcycle - Google Patents

Abstract

PURPOSE:To prevent failure of a cooling fan caused by sticking of dirt or water, and simultaneously, to enable cooling capability of radiators to be maintained even if the cooling fan fails, and to prevent the temperature rise of a fuel tank, and also to keep capacity of the fuel tank large. CONSTITUTION:One part area out of the whole area of radiators 14A, 14R is taken as a forcible cooling area S1 covered from back side with a fan shroud 22 enclosing a cooling fan 21, and the rest area is taken as a natural cooling area S2 through which a traveling wind to blow from ahead can pass in traveling of a motorcycle. And the forcible cooling area S1 is provided on the upper parts of the radiators 14L, 14R, while the natural cooling area S2 is provided on the lower part of the radiators 14L, 14R. Moreover, the upper part and the side parts of the forcible cooling area S1 are surrounded by a hollow- projecting part 25 formed by extending the front part of a fuel tank 12 into a hood shape, and a duct 24 for discharging cooling air in the optional direction is provided in a fan shroud 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a motorcycle equipped with a radiator for cooling an engine.

[0002]

2. Description of the Related Art FIG. 5 is a left side view of an off-road motorcycle equipped with a water-cooled engine. In this motorcycle 100, for example, an engine 102 is mounted on a lower front portion of a body frame 101, a fuel tank 103 is installed above the engine 102, and a radiator 1 for exchanging cooling water of the engine 102 in front of the fuel tank 103.
04 is installed.

The radiator 104 is a body frame 1
It is installed in a pair of left and right so as to sandwich 01, and is cooled by the running wind blown from the front when the motorcycle 100 is running.

[0004]

However, when the motorcycle 100 is stopped, the radiator 104 is not exposed to the traveling wind, and efficient cooling is not performed, so that the engine 102 may overheat. In particular, when the engine 102 is blown to get the motorcycle 100 out of the rough terrain, the cooling capacity of the radiator 104 with respect to the heat generation amount of the engine 102 is significantly insufficient, and the risk of overheating increases.

Therefore, it is conceivable to provide the radiator 104 with a cooling fan to forcibly cool the radiator 104 by air. In this case, the cooling fan is installed on the rear surface of the radiator 104, and a fan shroud that covers the cooling fan from the rear is provided.

The cooling fan is rotated by an electric motor and draws air from the front surface of the radiator 104 to the rear surface of the radiator 104. At that time, heat is taken by the air passing through the radiator 104, and the radiator 104 is cooled. The air drawn to the rear surface of the radiator 104 is
Collected in the fan shroud and discharged to the outside.
Therefore, even if the motorcycle 100 is stopped, the radiator 104 is efficiently cooled, and there is no concern that the engine 102 will overheat.

However, when the motorcycle 100 runs off-road, water, mud, etc., which are wound up by the front wheels and the preceding vehicle are easily applied to the cooling fan of the radiator 104, which causes a failure of the electric motor of the cooling fan or mud. May clog the cooling fan and prevent it from rotating. In addition, water is easily splashed on the electric motor of the cooling fan even when washing the vehicle or traveling in the rain, which easily causes a failure.

When the cooling fan fails in this way, not only the air on the front surface of the radiator 104 cannot be drawn out to the rear surface of the radiator 104, but also the traveling air blown from the front is blocked by the cooling fan and the fan shroud and the radiator 1
You cannot pass 04. Therefore, the radiator 104
The cooling capacity of the engine 102 is significantly reduced, and the engine 102 overheats.

On the other hand, since the radiator 104 is installed in front of the fuel tank 103, the radiator 1
The cooling air that has passed through 04 and has become hot has the fuel tank 10.
There is a possibility that the temperature of the fuel tank 103 may be raised by directly hitting the No. 3 position. If the temperature of the fuel tank 103 rises in this way, the fuel is likely to volatilize, and harmful volatilized fuel gas may leak to the outside.

In order to avoid such a temperature rise of the fuel tank 103, the fuel tank 103 and the radiator 1
It is necessary to take a large space before and after 04. However, because of the layout of the vehicle body, it is impossible to make the front-to-back space large. Therefore, as shown in FIG. The high temperature cooling air passing through 104 is prevented from immediately hitting the fuel tank 103.
However, due to this shape, the capacity of the fuel tank 103 is partially sacrificed.

The present invention has been made in order to solve such a problem, and can prevent the failure of the cooling fan due to the adhesion of mud, water, etc. as much as possible, and even if the cooling fan fails, the radiator is cooled. An object of the present invention is to provide a cooling device for a motorcycle, which is capable of maintaining the capacity, preventing the temperature of the fuel tank from rising, and keeping the capacity of the fuel tank large.

[0012]

In order to achieve the above object, a cooling device for a motorcycle according to the present invention is a cooling device for a motorcycle having a radiator for cooling an engine. The area of the part is a forced air cooling area covered from the rear by a fan shroud with a built-in cooling fan, and the remaining area is a natural air cooling area through which the running wind blowing from the front when the motorcycle is traveling can pass. It is a thing.

The forced air cooling area is provided above the radiator, and the natural air cooling area is provided below the radiator.

Further, the above-mentioned forced air-cooling area is characterized in that it is surrounded above and to the sides by a hollow protrusion extending from the front of the fuel tank in an eaves-like shape.

The fan shroud is characterized by being provided with a duct for discharging the cooling air in an arbitrary direction.

[0016]

In the motorcycle cooling device thus constructed, the forced air-cooled area of the radiator is forcibly air-cooled by the cooling fan, and the natural air-cooled area is naturally air-cooled by the traveling wind blown from the front. Therefore, even if the motorcycle is stopped and the radiator is not exposed to traveling wind, only the forced air cooling area of the radiator is continuously cooled, and the cooling capacity of the radiator is maintained. Therefore, there is no concern that the engine will overheat.

Further, even if the cooling fan should fail, since the traveling wind from the front can pass through the natural air-cooled area of the radiator, only the natural air-cooled area is continuously cooled and the cooling capacity of the radiator is maintained. It

Further, since the forced air cooling area is provided above the radiator and the natural air cooling area is provided below the radiator, mud and water scattered during off-road traveling are less likely to be applied to the forced air cooling area. Therefore, the possibility that mud or water will adhere to the cooling fan provided in the forced air cooling area and the cooling fan will malfunction will be greatly reduced.

Moreover, since the above and the sides of the forced air-cooling area are surrounded by the hollow protrusions that extend the front portion of the fuel tank in the shape of an eaves, the forced air-cooling area can be reduced when running in the rain or washing a car. Water is less likely to splash on the provided cooling fan, and the failure rate of the cooling fan is further reduced. Further, since the protrusion is hollow, the space in the protrusion greatly increases the capacity of the fuel tank.

Since the fan shroud is provided with the duct for discharging the cooling air in an arbitrary direction, the cooling air which has passed through the radiator and has a high temperature can be guided by the duct. For this reason, the temperature of the cooling air that has risen does not directly hit the fuel tank, and the temperature rise of the fuel tank is prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view of a motorcycle to which a cooling device according to the present invention is applied. This motorcycle 1
For example, a body frame 2 of a semi-double cradle type is provided, and a front fork 4 supporting a front wheel 3 is pivotally attached to a front head of the body frame 2 together with a handle bar 5 so as to be rotatable left and right, and the center of the body frame 2 is supported. A swing arm 7 extending rearward is pivotally attached to a pivot shaft 6 erected at a lower portion so as to be vertically swingable, and a rear wheel 8 is pivotally supported at a rear end portion thereof.

An engine 9 is provided at the lower front of the body frame 2.
Is mounted, and the power of the engine 9 is transmitted to the rear wheels 8 by the chain 11. A fuel tank 12 is installed above the engine 9, and a seat 13 is placed behind the fuel tank 12. Further, in front of the fuel tank 12, a pair of left and right radiators 14L and 14R for exchanging the cooling water of the engine 9 with the body frame 2 sandwiched therebetween are installed. Reference numeral 15 is a carburetor, 16 is an air cleaner, and 17 is an exhaust muffler.

2 (A) and 2 (B) are views showing an embodiment of the cooling device according to the present invention. (A) is a vertical sectional view taken along the line IIA-IIA in FIG. 1, and (B) is FIG. 2 is a transverse sectional view taken along the line IIB-IIB in FIG. 1. The fuel tank 12 is installed on the vehicle body frame 2 so as to extend from above, and a tank cap 18 for fuel injection is detachably provided on the upper portion thereof.

A fan shroud 22 incorporating a cooling fan 21 is provided on the rear surface of the radiators 14L and 14R.
Is attached. An electric motor 23 is installed in the fan shroud 22, and the cooling fan 21 is provided integrally with the main shaft of the electric motor 23 so as to rotate together. The cooling fan 21 draws air from the front surfaces of the radiators 14L and 14R to the rear surface, and at that time, heat is taken away by the air passing through the radiators 14L and 14R, so that the radiator 14L
L and 14R are cooled.

At the rear of the fan shroud 22, there is provided a duct 24 for discharging the cooling air in an arbitrary direction, for example, downward (or sideways). Therefore, the cooling air that has passed through the radiators 14L and 14R is discharged downward through the duct 24.

The area where the fan shroud 22 covers the rear surfaces of the radiators 14L and 14R is a part of the total area of the radiators 14L and 14R.
This area is set as a forced air cooling area S1, and the remaining area is set as a natural air cooling area S2 through which traveling wind blown from the front when the motorcycle 1 travels can pass. The forced air cooling area S1 is provided above the radiators 14L and 14R, and the natural air cooling area S2 is provided below the radiators 14L and 14R.

Here, the upper and lateral sides of the forced air cooling area S1 are surrounded by a hollow protrusion 25 provided in the fuel tank 12. The protrusion 25 is an eaves-like extension of the front portion of the fuel tank 12. As shown in FIG. 2B, the inside of the protrusion 25 is a curved surface that smoothly curves toward the center of the vehicle body. It is said that.

The ratio of the forced air cooling area S1 of the radiators 14L and 14R to the natural air cooling area S2 is selected depending on the running conditions of the motorcycle 1 and the heat generation amount of the engine 9, etc.
Preferably, S1: S2 is in the range of 1: 1 to 1: 4. In FIG. 2A, S1: S2 is almost 1: 1. Further, FIG. 3 is an example in which S1: S2 is set to approximately 1: 3. In this example, for example, only the upper half of the radiator 14L side is covered with the fan shroud 22, and the fan shroud 22 is not provided on the radiator 14R side.

Further, FIG. 4 shows a modification in which S1: S2 is set to 1: 1. In this modification, the radiator 14L side is entirely covered with the fan shroud 22, and the entire area is the forced air cooling area S1.
Further, the fan shroud 22 is not provided on the radiator 14R side, and the entire area thereof is the natural air cooling area S2.

According to the shape of the forced air cooling area S1,
It is advisable to change the shape of the protrusion 25 provided on the fuel tank 12.

When the cooling device for the motorcycle 1 is configured as described above, the forced air cooling area S1 of the radiators 14L and 14R is forcibly cooled by the cooling fan 21, and the natural air cooling area S2 is naturally blown by the traveling wind. Air cooled. Therefore, the motorcycle is stopped and the radiator 1
Radiator 1 even if there is no running wind on 4L and 14R
Only the forced air cooling areas S1 of 4L and 14R are continuously cooled, and the cooling capacity of the radiators 14L and 14R is maintained. Therefore, there is no concern that the engine will overheat.

Further, even if the cooling fan 21 fails,
Since the traveling wind from the front can pass through the natural air-cooled area S2 of the radiators 14L and 14R, only the natural air-cooled area S2 is continuously cooled, and the radiators 14L and 14R are cooled.
The cooling capacity of R is maintained.

Further, the forced air cooling area S1 is set to the radiator 1
Since the natural air-cooled area S2 is provided above the 4L and 14R and below the radiators 14L and 14R, mud and water scattered during off-road running or the like are less likely to be applied to the forced air-cooled area S1. Therefore, the possibility that mud or water will adhere to the cooling fan 21 provided in the forced air cooling area S1 and the cooling fan 21 will malfunction will be greatly reduced.

Moreover, since the upper and lateral sides of the forced air-cooling area S1 are surrounded by the hollow projecting portion 25 extending from the front portion of the fuel tank 12 in an eaves-like shape, it is forcibly forced during rain driving or car washing. Water is less likely to splash on the cooling fan 21 provided in the air cooling area S1, and the failure rate of the cooling fan 21 is further reduced. In addition, since the protrusion 25 is hollow, the space inside the protrusion 25 causes the fuel tank 12
The capacity of is greatly increased.

Since the fan shroud 22 is provided with the duct 24 for discharging the cooling air in an arbitrary direction, the cooling air which has passed through the radiators 14L and 14R and has a high temperature can be guided by the duct 24. For this reason, the cooling air having a high temperature does not directly contact the fuel tank 12, and the temperature rise of the fuel tank 12 can be effectively prevented.

[0037]

As described above, in the motorcycle cooling device according to the present invention, in the motorcycle cooling device having the engine cooling radiator, a part of the total area of the radiator is A forced air-cooling area covered from the rear by a fan shroud with a built-in cooling fan is used, and the remaining area is a natural air-cooling area through which the traveling wind blowing from the front when the motorcycle is traveling can pass.

In this case, the forced air cooling area of the radiator is forcibly air cooled by the cooling fan, and the natural air cooling area is naturally air cooled by the traveling wind blown from the front.
Therefore, even if the motorcycle is stopped and the radiator is not exposed to traveling wind, only the forced air cooling area of the radiator is continuously cooled, and the cooling capacity of the radiator is maintained.
Therefore, there is no concern that the engine will overheat.

In addition, even if the cooling fan should fail, since the traveling wind from the front can pass through the natural air-cooled area of the radiator, only the natural air-cooled area is continuously cooled, and the cooling capacity of the radiator is maintained. To be done.

Further, in the motorcycle cooling device according to the present invention, since the forced air cooling area is provided above the radiator and the natural air cooling area is provided below the radiator, the mud and water scattered during off-road running and the like are prevented. The forced air cooling area is less likely to be affected, and the possibility that mud or water adheres to the cooling fan provided in the forced air cooling area and the cooling fan malfunctions is greatly reduced.

Further, in the motorcycle cooling device according to the present invention, since the upper and lateral sides of the forced air cooling area are surrounded by the hollow projecting portion obtained by extending the front portion of the fuel tank in an eaves-like shape, it is possible to avoid rain. During running or car washing, the cooling fan provided in the forced air cooling area is less likely to be splashed with water, further reducing the failure rate of the cooling fan. Further, since the protrusion is hollow, the space in the protrusion greatly increases the capacity of the fuel tank.

In the motorcycle cooling device according to the present invention, the fan shroud is provided with the duct for discharging the cooling air in an arbitrary direction. Therefore, the cooling air which has passed through the radiator and has a high temperature is guided by the duct. be able to. For this reason, the cooling air having a high temperature does not directly contact the fuel tank, and the temperature rise of the fuel tank is effectively prevented.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle to which a cooling device according to the present invention is applied.

FIG. 2 is a diagram showing an embodiment of a cooling device according to the present invention,
(A) is a vertical sectional view taken along the line IIA-IIA in FIG. 1, and (B) is shown in FIG.
A cross-sectional view taken along line IIB-IIB.

FIG. 3 is a longitudinal sectional view showing an example in which S1: S2 is set to approximately 1: 3.

FIG. 4 shows a modification of the present invention and is a vertical cross-sectional view when S1: S2 is set to 1: 1.

FIG. 5 is a left side view of a motorcycle showing a conventional technique.

[Explanation of symbols]

 1 Motorcycle 2 Body Frame 9 Engine 12 Fuel Tank 14L, 14R Radiator 21 Cooling Fan 22 Fan Shroud 23 Electric Motor 24 Duct 25 Projection S1 Forced Air-cooled Area S2 Natural Air-cooled Area

Claims (4)

[Claims] 1. A cooling device for a motorcycle including a radiator for cooling an engine, wherein a part of the total area of the radiator is a forced air cooling area covered with a fan shroud containing a cooling fan from the rear surface, The remaining area,
A cooling device for a motorcycle, characterized in that it has a natural air-cooled area through which traveling wind blown from the front can pass when the motorcycle is traveling. 2. The cooling device for a motorcycle according to claim 1, wherein the forced air cooling area is provided above the radiator and the natural air cooling area is provided below the radiator. 3. The upper side and the side of the forced air cooling area,
The cooling device for the motorcycle according to claim 1, wherein the front portion of the fuel tank is surrounded by a hollow protrusion extending in an eaves shape. 4. The cooling device for a motorcycle according to claim 1, wherein the fan shroud is provided with a duct for discharging cooling air in an arbitrary direction.