JPH0457846B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to motorcycles, such as scooters, in which the engine is housed in a space that is sealed at the top and surrounded by a cover on the sides. This relates to a cooling device.

[Prior Art] In the above-mentioned motorcycles, a forced air-cooled engine is used because the engine mounted thereon cannot be expected to be cooled by the running wind. In this forced air-cooled engine, the sides of the engine are surrounded by a case, and cooling air is forcibly fed into the case by a cooling fan to cool the engine.

However, since the space housing the engine is almost surrounded by a cover, etc., except for the bottom, hot air discharged from the case after the engine has been cooled, or hot air leaking from the gap between the case and the engine, tends to get trapped inside the cover. The temperature in this space may rise, causing the carburetor to overheat, or hot air may be sucked in from the air cleaner, causing problems such as a reduction in engine output.

Therefore, for example, Japanese Utility Model Publication No. 43-18414 discloses a system in which a carburetor and an air cleaner are placed inside the cover outside the case and are cooled by cooling air branched from the engine cooling air. There is.

[Problem to be solved by the invention] In the case of motorcycles, in order to lower the overall center of gravity and make driving easier, the engine is placed at approximately the same height as the wheels, and the wheels and engine are covered. However, in such cases, the wheels are equipped with rear fenders, and the dust raised by the wheels as they run accumulates inside the covers, and this dust is sucked in from the air cleaners near the wheels. , the filter inside the air cleaner may become clogged and the engine may malfunction.

This invention was made in view of the problems of the prior art, and its purpose is to provide an engine in which the carburetor is not overheated and air is not sucked in from the air cleaner due to heat. It is an object of the present invention to provide a cooling device for a motorcycle that does not cause clogging of the filter inside the air cleaner.

[Means for Solving the Problems] In order to achieve the above object, the cooling device for a motorcycle according to the present invention surrounds the side of the engine with a case, and cools the engine through an opening provided in the case by a cooling fan. In a scooter-type vehicle in which a cover covers a forced air-cooled engine that supplies cooling air to the inside of the case, the lower rear edge of the cover is tilted rearward and upward so that the cover partially covers the rear wheels, and the inside of the cover is A rear fender is provided to cover above the rear wheels, an air cleaner is provided within the cover on one side of the rear fender, a carburetor connected to the air cleaner is provided outside the case and within the cover, and a cooling fan is provided within the case. A main cooling air passage leading from the main cooling air passage to the cylinders of the engine is provided, and a sub cooling air passage is provided that branches from the main cooling air passage inside the cover outside the case, and the terminal end of the sub cooling air passage is connected to the carburetor and the air cleaner. The sub-cooling air is opened in the direction of the cover and the sub-cooling air is discharged to the outside of the cover through a space between the cover and the rear fender.

[Operation] Cooling air is supplied from the cooling fan to the main cooling air passage leading to the cylinders of the engine, and the engine is forcibly cooled.

On the other hand, a part of the air fed by the cooling fan is blown out from the sub-cooling air passage in the direction of the carburetor and air cleaner, collides with the carburetor and air cleaner, and then passes between the cover and rear fender and enters the cover. The air is pushed out from the rear lower end of the cover and released to the outside of the cover.

[Embodiments] Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a forced air-cooled engine, which is housed in a space whose upper part is sealed by a fuel tank seat and the like, and which is surrounded by a cover 3. This engine 1 is designed to drive rear wheels 16 located at approximately the same height as the engine 1. The rear part of the cover 3 covering the engine 1 has a rear wheel 16.
The rear lower edge of the cover is inclined rearward and upward so as to cover a portion of the cover. Further, a rear fender 17 is provided above the rear wheel 16, and this rear fender 17 covers the upper side of the rear wheel 16 within the cover 3.

The side of the engine 1 is surrounded by a case 4, and a cooling fan 5 attached to the crankshaft of the engine 1 is provided inside the case 4. Above the engine 1, outside the case 4 and inside the cover 3, there is a carburetor 2 and an air cleaner 15 communicating therewith.
is located on one side of the rear fender to suck in air.

The cooling fan 5 introduces cold air near the lower opening 7 of the cover 3 from the intake port 6 of the case 4,
Cooling air is supplied to the main cooling air passage 9 leading to the cylinder 8 to forcibly cool the engine.

On the other hand, on the upper side of the case 4, a pipe-shaped auxiliary cooling air passage 10 is provided outward from the case 4, so that a part of the air fed by the cooling fan 5 branches off. The starting end port 11 of this sub-cooling air passage 10 is opened in the centrifugal direction of the cooling fan 5, that is, in the air blowing direction. It is opened towards. Also,
The space between the start end port 11 and the end end port 12 is pipe-shaped, has a substantially uniform cross-sectional area, and is smoothly continuous. After colliding with the carburetor 2 and the air cleaner 15, the cold air blowing out from the terminal port 12 passes between the cover 3 and the rear fender 17, pushing out the air inside the cover 3 from the rear lower end of the cover 3.
released to the outside.

Therefore, even if the hot air that cools the engine 1 and is discharged from the case 4 or the hot air that leaks from the gap between the case and the engine tries to stay inside the cover 3, the terminal port 1
2, the temperature inside the cover 3 will drop and the carburetor 2 will not overheat, or hot air will be sucked in from the air cleaner 15 and the engine output will be reduced.

Furthermore, although a rear fender 17 is attached to the rear wheel 16, the dust that is kicked up during driving stays in the cover 3 and is sucked in from the air cleaner 15 located near the rear wheel 16, but the flow inside the cover 3 is Since this accumulated dust is also discharged, although the motorcycle has a lower center of gravity, it prevents clogging of the filter inside the air cleaner 15 and reduces the trouble of cleaning and engine malfunction due to clogging.

Further, since the rear lower edge of the cover 3 that covers the engine 1 is sloped rearward and upward so as to partially cover the rear wheels 16, it is extremely easy to discharge the accumulated dust from the rear of the cover 3.・Easy to do.

[Effects of the Invention] In this invention, even if the hot air that cools the engine tries to stay inside the cover, it is discharged from the rear lower end of the cover by the cold air blown out from the end of the sub-cooling air passage, so the temperature inside the cover is reduced. Of course, this will not cause the carburetor to overheat due to the drop in temperature, nor will the engine output be reduced by sucking in hot air from the air cleaner.

In addition, the flow of cold air inside the cover also exhausts the dust that is kicked up by the rear wheels as it runs, so even though it is a motorcycle with a lower center of gravity, it prevents the filter inside the air cleaner from clogging and makes cleaning more troublesome. This can reduce engine malfunctions caused by clogging.

Further, since the rear lower edge of the cover that covers the engine is sloped rearward and upward so as to cover part of the rear wheels, accumulated dust can be discharged from the rear part of the cover very easily and easily.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of a motorcycle equipped with a cooling device according to the present invention, and FIG. 2 is a plan view of the engine. DESCRIPTION OF SYMBOLS 1... Engine, 2... Carburizer, 3... Cover, 4... Case, 5... Cooling fan, 6... Opening, 8... Cylinder, 9... Main cooling air passage, 1
0...Sub-cooling air passage, 12...Terminal port, 15...
Air cleaner, 16...rear wheel, 17...rear fender.

Claims (1)

[Claims] 1. In a scooter type vehicle in which the side of the engine is surrounded by a case and a cover covers a forced air-cooled engine that supplies cooling air to the inside of the case by a cooling fan from an opening provided in the case, the cover A rear lower edge of this cover is inclined rearward and upward so as to cover a part of the rear wheel, a rear fender is provided within the cover to cover an upper part of the rear wheel, and an air cleaner is provided within the cover on one side of the rear fender, A carburetor connected to the air cleaner is provided inside the cover outside the case, a main cooling air passage leading from the cooling fan to the cylinder of the engine is provided inside the case, and from this main cooling air passage outside the case inside the cover. A sub-cooling air passage is provided that branches into the sub-cooling air passage, the terminal end of the sub-cooling air passage is opened toward the carburetor and the air cleaner, and the sub-cooling air is passed between the cover and the rear fender to the outside of the cover. A cooling device for a motorcycle, characterized in that the cooling device is configured to emit water.