JP2000238687A - Cooling device for motor-cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an interval between an engine and a radiator by preventing a fan blade of a motor fan from being affected by the heat of an exhaust pipe, simultaneouly to improve the layout around the engine, and to reduce the discomfort given to a rider by preventing the air current of the motor fan from being heated by the exhaust pipe. SOLUTION: This device comprises a thermal insulation plate 37 between a fan blade 29 of a motor fan 25 and an exhaust pipe extending from a front surface of the engine. Whereby the heat of the exhaust pipe toward the fan blade 29 is cut by the thermal insulation plate 37, the fan blade 29 is not damaged by the heat, and the restriction on the relative position of the motor fan 25 and the exhaust pipe is released, so that an interval between the engine and the radiator (front wheel) can be shortened, and the layout around the engine can be improved. The air current of the motor fan 25 is not directly contacted with the exhaust pipe by mounting the thermal insulation plate 37, an amount of hot air is reduced, and the discomfort to the rider can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a motorcycle in which a radiator of a water-cooled engine is provided with an electric fan for auxiliary cooling.

[0002]

2. Description of the Related Art In many motorcycles, an engine is disposed behind a front wheel, and when the engine is a water-cooled type, a radiator is provided in front of the engine. Further, an electric fan for cooling the radiator in an auxiliary manner is installed on a rear surface of the radiator.

By the way, in consideration of the weight distribution and weight reduction of a motorcycle, the engine should be moved forward (front wheel side) as much as possible.
It is desirable to arrange the radiator near the engine, but this reduces the installation space of the radiator between the engine and the front wheels, and particularly makes it difficult to install the electric fan.

Therefore, a structure is adopted in which the radiator is bent (curved) so as to project rearward in a plan view, the left and right sides of the radiator are separated from the engine, and an electric fan is installed on the rear surface. With this configuration, the engine can be disposed forward while avoiding interference between the electric fan and the engine.

[0005]

However, even with the above construction, since the exhaust pipe extending from the front of the engine is located very close to the electric fan, the fan blade of the electric fan made of synthetic resin is used. However, there is a concern that the material may deteriorate due to the heat of the exhaust pipe. Therefore, the space between the engine and the radiator cannot be sufficiently reduced, and the layout of the electric fan and the exhaust pipe is greatly restricted, so that a sufficient cooling effect and exhaust efficiency may not be obtained.

Further, in a motorcycle in which the front half of the vehicle body is covered with a streamlined cowling, the engine and the radiator are covered by the cowling. Although it is easy to give the rider discomfort, for example, when the electric fan is operated while the motorcycle is stopped, the air flow of the electric fan hits the exhaust pipe and is heated, and as a result, the amount of hot air increases, so the above discomfort is promoted There was also a problem that.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to prevent a fan blade of an electric fan from being damaged by heat of an exhaust pipe to shorten a distance between an engine and a radiator. Motorcycles that improve the layout around the engine, reduce the discomfort to riders by preventing the exhaust air from being heated by the electric fan, and also simplify the structure of the electric fan. It is an object of the present invention to provide a cooling device.

[0008]

In order to achieve the above object, a motorcycle cooling system according to the present invention has an engine located behind a front wheel and a front side of the engine. A radiator is installed, and in a motorcycle cooling device in which an electric fan is mounted on a rear surface of the radiator, a heat shield plate is interposed between a fan blade of the electric fan and an exhaust pipe extending from a front surface of the engine. Was.

With this structure, the heat shield plate blocks heat from the exhaust pipe to the fan blades of the electric fan, thereby preventing heat damage to the fan blades. Since there is no restriction on the relative position of the pipes, the distance between the engine and the radiator (front wheel) can be reduced, and the layout around the engine is improved. Further, since the airflow of the electric fan does not directly hit the exhaust pipe by the heat shield plate, the amount of hot air is reduced, and the rider's discomfort is reduced.

According to another aspect of the present invention, there is provided a motorcycle cooling apparatus for connecting a motor unit constituting the electric fan and an outer peripheral frame. The heat shield plate was also used as a connecting member to be used. Thus, the number of other connecting members can be reduced, so that the structure of the electric fan can be simplified.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 an embodiment of a cooling device according to the present invention is applied.

The motorcycle 1 has a body frame 2
The front wheel 4 is supported by a front fork 3 pivotally supported by a front head of the vehicle, and a swing arm 7 that supports a rear wheel 6 is pivotally supported by a pivot shaft 5 provided at a lower center of the body frame 2.

An engine 8 mounted on the lower front half of the vehicle body frame 2 is located immediately behind the front wheels 4, and a fuel tank 9 is installed above the engine 8. A seat 10 and a pillion seat 11 are located behind the fuel tank 9. Is placed. In addition,
The first half of the motorcycle 1 is covered with a streamlined cowling 12 to reduce air resistance and improve the appearance during traveling.

2 and 3 are a left side view and a plan view around the engine 8, respectively. The engine 8 is, for example, a water-cooled parallel four-cylinder engine, and a cylinder block 14, a cylinder head 15, and a head cover 16 are sequentially installed on a front upper surface of a crankcase 13. As shown in FIG.
A fuel injection device 17 and an air cleaner 18 are connected to a rear portion of the cylinder head 15. The upper portion of the fuel injection device 17 and the air cleaner 18 are accommodated in a concave portion (not shown) provided inside the fuel tank 9. Also, the cylinder head 15
The four exhaust pipes 19 extending from the front surface of the exhaust pipe extend downward and bend rearward, and pass through the collecting pipe 20 and the muffler pipe 21 to the exhaust muffler 22.
Leads to.

A radiator 24 for exchanging heat with cooling water is provided in front of the engine 8. The radiator 24 is cooled by traveling wind blown from the front when the motorcycle 1 travels. An electric fan 25 is provided on the rear surface of the radiator 24. When cooling of the radiator 24 due to the traveling wind cannot be expected, such as when the motorcycle 1 is stopped, the electric fan 25 operates to cool the radiator 24 in an auxiliary manner. The radiator 24 and the electric fan 25 constitute a cooling device according to the present invention. The radiator
Below the 24, an oil cooler 26 is installed.

As shown in FIG. 3, the radiator 24 is bent (curved) so as to project rearward in a plan view, and both left and right ends thereof are separated from the engine 8 forward. The electric fan 25 is installed on the rear surface of the radiator 24 near the left end or near the right end (in the present embodiment, near the left end) and is provided in an offset manner. This allows
Interference between the electric fan 25 and the engine 8 is prevented, and at the same time, the cooling performance is improved by increasing the area of the radiator 24.

FIG. 4 is a rear view of the electric fan 25, and FIG.
Is a partial cross-sectional view of the electric fan 25 as viewed from the VOV arrow in FIG.
6 is a bottom view of the electric fan 25, and FIG. 7 is a VII-O-VII of FIG.
FIG. 3 is a cross-sectional view of the electric fan 25 along a line.

The electric fan 25 includes a motor unit 28 located at the center, a fan blade 29 attached to the motor unit 28, an outer peripheral frame 30 surrounding the periphery of the fan blade 29, and a substrate 31 of the motor unit 28. Connecting members 32, 33, and 34 extending to the outer peripheral frame 30
And one support arm 35 extending from the outer peripheral frame 30 to the outer peripheral side.
, A protection net 36 and a heat shield plate 37.

At the tips of the two connecting members 32, 33 and the support arm 35, fastening portions 32a, 33a, 35a each having a hole are provided, and these fastening portions 32a, 33a, 35a are provided on the rear surface of the radiator 24. The entirety of the electric fan 25 is fixed to the rear surface of the radiator 24 by being fastened with the screw.
The protection net 36 is installed between the two connecting members 32 and 33 on the left side of the electric fan 25 in the vehicle width direction, and protects the fan blade 29 that rotates when the electric fan 25 is operated from touching the fan blade 29.

The heat shield plate 37 is formed of a metal material such as a steel plate, and also serves as a connecting member for connecting the motor unit 28 (substrate 31) and the outer peripheral frame 30. For example, a central portion 37a of a heat shield plate 37 formed in a substantially fan shape is fixed to the rear surface side of the substrate 31 of the motor unit 28, and two tongue-shaped joining plates 37b provided on an outer peripheral portion of the heat shield plate 37. , 37c are fixed to the outer peripheral surface of the outer peripheral frame 30. The fixing position of the heat shield plate 37 is such that the exhaust pipe 19 of the engine 8 is the most fan blade 29
Is positioned so as to be interposed between the fan blade 29 and the exhaust pipe 19 in a portion approaching the airbag.

As described above, the heat shield plate 37 is connected to the fan blade 29
If it is interposed between the exhaust pipe 19 and the
Is blocked from the fan blade 29, so that no heat damage is exerted on the fan blade 29. As a result, since there is no restriction on the relative position between the electric fan 25 and the exhaust pipe 19, the interval between the engine 8 and the radiator 24 (electric fan 25) can be reduced, and the engine 8 is moved to the front wheel 4 side so that the motorcycle In addition to optimizing the weight distribution of the vehicle body 1, the front and rear length of the vehicle body frame 2 can be shortened to achieve weight reduction. Further, since the degree of freedom is increased in the position of the electric fan 25, the curved shape of the exhaust pipe 19, and the like, the cooling effect and the exhaust efficiency can be improved.

Further, the air flow of the electric fan 25 is
Because it is deflected and does not directly hit the exhaust pipe 19, the air flow of the electric fan 25 is heated by the exhaust pipe 19 and does not become hot air rising upward in the cowling 12 as in the related art, The reduced amount of hot air greatly reduces rider discomfort.

A heat shield plate 37 serves as a connecting member for connecting the outer peripheral frame 30 of the electric fan 25 and the motor unit 28.
Is also used, the number of other connecting members 32, 33, and 34 can be reduced to only three, and the structure of the electric fan 25 can be simplified accordingly.

In this embodiment, the heat shield plate 37 is provided as a single component. However, components such as the outer peripheral frame 30, the substrate 31 of the motor unit 28, the connecting members 32, 33, 34, and the support arm 35 are provided. For example, the heat shield plate 37 may be provided integrally. As a modified example, it is conceivable to provide the heat shield plate 37 on the radiator 24 side.

[0025]

As described above, in the motorcycle cooling system according to the present invention, the engine is located behind the front wheels.
In a motorcycle cooling device in which a radiator is installed in front of the engine and an electric fan is mounted on a rear surface of the radiator, a cooling device is provided between a fan blade of the electric fan and an exhaust pipe extending from a front surface of the engine. Since the heat plate is interposed, the heat shield plate blocks the heat of the exhaust pipe from the fan blades, thereby preventing the fan blades from being damaged by heat and making it possible to shorten the distance between the engine and the radiator (front wheel). In addition, the layout around the engine can be improved, and the air flow of the electric fan can be prevented from being heated by the exhaust pipe, thereby reducing discomfort to the rider.

In the motorcycle cooling device according to the present invention, the heat shield plate is also used as a connecting member for connecting between the motor unit constituting the electric fan and the outer peripheral frame. Can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a left side view around an engine.

FIG. 3 is a plan view around an engine.

FIG. 4 is a rear view of the electric fan according to the embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of the electric fan as viewed from the VOV arrow in FIG. 4;

FIG. 6 is a bottom view of the electric fan.

FIG. 7 is a sectional view of the electric fan taken along the line VII-O-VII in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 4 Front wheel 8 Engine 19 Exhaust pipe 24 Radiator 25 Electric fan 28 Motor unit 29 Fan blade 30 Outer frame 32, 33, 34 Connecting member 35 Support arm 36 Protective net 37 Heat shield plate

Claims (2)

[Claims] 1. A motorcycle cooling system in which an engine is located behind a front wheel, a radiator is installed in front of the engine, and an electric fan is mounted on a rear surface of the radiator. A motorcycle cooling device characterized in that a heat shield plate 37 is interposed between the exhaust pipe 19 extending from the front of the engine 8 and the exhaust pipe 19. 2. The motorcycle cooling device according to claim 1, wherein the heat shield plate 37 is also used as a connecting member for connecting the motor unit 28 constituting the electric fan 25 and the outer peripheral frame 30.