JPH0825499B2 - Motorcycle - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an improvement of a motorcycle provided with a pair of left and right main frames which are wide in side view.

[Conventional technology]

Improving the frame rigidity of a motorcycle is one of the means for improving the running stability. Conventionally,
As a means for improving the rigidity of the frame, there has been proposed a structure in which a pair of left and right main frames are wide in side view. However, such a wide frame in side view forms walls on both left and right sides to form a space for covering the upper side, so that the fuel supply section such as a carburetor arranged above the engine is covered by the cover section. Be surrounded.

However, in the structure in which the fuel supply section is covered with the cover in this way, the hot air from the engine below accumulates in the cover, so that the temperature of the carburetor rises and bubbles easily occur in the fuel, As a result, the fuel in the carburetor becomes difficult to flow, the air-fuel mixture becomes thin, and the output of the engine decreases.

[Object of the Invention]

An object of the present invention is to use a pair of left and right main frames that are wide in side view, and even in a motorcycle in which a carburetor or the like is arranged inside a cover formed by the main frames, etc. It is an object of the present invention to provide a motorcycle capable of exhibiting a stable engine output without the carburetor of FIG.

[Structure of Invention]

The present invention that achieves the above object is provided with a pair of left and right main frames that are wide in a side view, and a parallel multi-cylinder engine that is arranged in the vehicle width direction is mounted below the pair of left and right main frames with substantially the same left and right width. A motorcycle in which a plurality of carburetors and the like arranged in parallel in the vehicle width direction are arranged above the engine, and a cover which covers the carburetors and the like is arranged above the pair of left and right main frames so as to project upward. In the above, the pair of left and right main frames are formed in a straight line that descends rearward so that the rear side of the vehicle body becomes lower in a side view, and an intermediate portion that passes near the left and right sides of the carburetor and a rear portion of the intermediate portion from the intermediate portion. Also has a narrowed portion having a narrowed width in the left-right direction, and openings on both left and right lower edges of the cover, which face the narrowed portion and have the same height as the carburetor, pass through from the inside to the outside of the cover. Formation It is characterized in that the.

〔Example〕

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

In FIGS. 1 and 2, reference numerals 1 and 1 denote a main frame made of an aluminum material which is wide in a vertical direction in a side view, 2 denotes an engine,
3 is a sheet. An air purifier 4 and a fuel tank 5 are arranged in front of and behind the seat 3, and a carburetor 6 is connected below the air purifier 4, and the carburetor 6 is further connected to the engine 2 to reduce fuel consumption. It constitutes the supply unit.

The engine 2 is composed of parallel multi-cylinder engines arranged in the vehicle width direction and having substantially the same lateral width below the main frames 1, 1. Vaporizer 6 arranged above the engine 2
Are arranged in parallel along the vehicle width direction. Main frame
1,1 are formed in a straight line that descends rearward so that the rear side of the vehicle body becomes lower in a side view, and intermediate portions 1a, 1a passing near the left and right sides of a plurality of carburetors 6 and a rider behind the intermediate portions 1a, 1a. In order to improve the riding posture of the vehicle, it has a configuration including narrowed portions 1b, 1b having a narrower lateral width than the intermediate portion.

The air purifier 4 and the fuel tank 5 are covered on the upper side and the left and right sides by a cover 7 arranged so as to project upward on the main frames 1, 1, and the carburetor 6 below the air purifier 4 is covered.
The left and right sides are covered by a wide main frame 1,1. In this way, the fuel supply parts such as the fuel tank 5, the air purifier 4, the carburetor 6 and the like are covered with the cover 7 and the main frames 1, 1 so that they cannot be seen from the outside and the appearance is improved.

At the lower part on the front side of the fuel tank 5, as shown in FIGS. 3 and 4, there are guide surfaces 11s, 11 facing diagonally rearward on both left and right sides.
Recesses 11, 11 having s are formed, and openings 7a, 7a are formed on both sides of the cover 7 so as to correspond to the recesses 11, 11, respectively. The openings 7a, 7a are formed on the lower left and right edges of the cover 7 facing the narrowed portions 1b, 1b and at the same height as the carburetor 6.

According to the motorcycle having the above-described structure, the wind that has entered from the lower side of the main frames 1 and 1 in front of the vehicle body by traveling is a carburetor.
After passing through 6, ..., 6 and cooling them, they are separated into left and right on the front surface of the fuel tank 5, and left and right recesses 1
Along the guide surfaces 11s, 11s of 1, 11, openings 7a on both sides of the cover 7,
It is discharged from 7a to the outside. Therefore, the hot air rising from the engine 2 does not stay in the cover 7 and can always be maintained at an appropriate temperature in the cover 7.

Therefore, in the above motorcycle, the fuel supply section in which the carburetor 6 is arranged in front of the fuel tank 5 is the main frame 1,
Although the structure is surrounded by the cover 7 together with 1, the carburetor 6 does not raise the temperature and deteriorate the flow of fuel or thin the air-fuel mixture, which causes a decrease in the output of the engine 2. There is no such thing. Moreover, the main frame
Since openings 7a, 7a are provided at the lower edges on both the left and right sides of the cover 7 facing the narrowed portions 1b, 1b of 1,1 and having the same height as the carburetor 6, the openings 7a, 7a are formed in the carburetor 6 Will be located just behind the front of the cover 7
The wind that has entered the inside can be discharged more smoothly from the openings 7a, 7a. Therefore, in the case where the parallel multi-cylinder engine 2 arranged in the vehicle width direction is mounted and the plurality of carburetors 6 arranged in the vehicle width direction are arranged above the engine 2, it is possible to more reliably prevent the temperature increase of the carburetor. be able to.

Further, when a plurality of carburetors 6 are arranged side by side in the vehicle width direction, it becomes difficult for the inside carburetors to cool, but the openings on both the left and right sides of the cover 7 are reduced.
Since 7a can be located just behind the vaporizer 6, the internal vaporizer can also be effectively cooled.

Further, by forming the openings 7a at the lower edges on both the left and right sides of the cover 7, the opening 7a has a concave shape with one side open.
It can be easily formed.

〔The invention's effect〕

As described above, according to the present invention, the left and right lower edges of the cover provided so as to cover the carburetor in cooperation with the pair of left and right main frames that are wide in side view are pulled out from the inside of the cover to the outside. Since the opening is formed, the hot air of the engine that has risen into the cover escapes to the openings at the lower edges on both the left and right sides, so that the hot air does not remain in the cover and the temperature rise of the carburetor can be prevented. Therefore, a stable engine output can be obtained thereby.

In addition, the left and right sides of the cover that faces the narrowed portion of the main frame that is lower than the middle part behind the middle part that passes near the left and right sides of the carburetor and is at the same height as the carburetor Since the opening is formed at the lower edge, the opening can be located just behind the carburetor, so that the wind that has entered the cover from the front can be discharged more smoothly from the opening, As a result, in a case where a parallel multi-cylinder engine lined up in the vehicle width direction is mounted and a plurality of carburetors arranged in parallel in the vehicle width direction are arranged above the engine, it is possible to more reliably prevent the temperature rise of the carburetor. .

In addition, since the openings on both the left and right sides of the cover can be positioned just behind the carburetor, it is possible to effectively cool the inner carburetor which is difficult to cool when a plurality of carburetors are arranged in parallel in the vehicle width direction.

Furthermore, since openings are formed at the lower edges on both the left and right sides of the cover, it is possible to make a concave opening with one open.
Its formation is easy and the cover shape does not become complicated.

[Brief description of drawings]

1 is a side view of a motorcycle having a fuel supply unit structure according to the present invention, and FIG. 2 is a plan view showing the fuel supply unit of the motorcycle without an upper cover and an air purifier,
FIG. 3 is a side view of the fuel tank of the fuel supply section, and FIG. 4 is a bottom view of the fuel tank. 1 ... main frame, 1a ... middle part, 1b ... diaphragm part, 2 ...
… Engine, 3 …… Seat, 4 …… Air purifier, 5 ……
Fuel tank, 6 carburetor, 7 cover, 7a opening, 11 recess, 11s guide surface.

Claims (1)

[Claims] 1. A pair of left and right main frames having a wide side view,
Below this pair of left and right main frames, with a substantially equal left and right width,
A parallel multi-cylinder engine lined up in the vehicle width direction is mounted, a plurality of carburetors and the like arranged in parallel in the vehicle width direction are arranged above the engine, and the vaporization is performed on the pair of left and right main frames in cooperation with the main frames. In a motorcycle in which a cover for covering a carburetor and the like is arranged so as to project upward, the pair of left and right main frames is formed in a straight line that descends rearward so that the rear side of the vehicle body becomes lower in a side view, and the left and right sides near the carburetor Left and right sides of the cover that has a middle part that passes therethrough and a throttle part that is narrower in the lateral width than the middle part behind the middle part, faces the throttle part, and has the same height as the carburetor. A motorcycle having an opening formed in the lower edge from the inside to the outside of the cover.