JPH0342390A - Suction device for vehicle, e.g. motorcycle - Google Patents

Abstract

PURPOSE:To facilitate manufacture by a method wherein, in a device in which a fuel tank and a seat are mounted, in order, in the rear of steering, an air cleaner is disposed below the seat, and is communicated to a space part formed between the rear part of the fuel tank and the rear part of the cover member of the fuel tank. CONSTITUTION:In a motorcycle in which a fuel tank 7 and a seat 8 are mounted, in order, on a main pipe 2b extending obliquely downwardly from the head pipe of a car body frame 12, an air cleaner 9a is arranged in a position below the seat 8. The seat 8 is formed such that a cushion material 13 is formed integrally with a bottom plate 12 the lower part of which is formed by using a resin sheet, and the front part thereof is extended in a manner to cover a position above the fuel tank 7 throughout the whole surface. The bottom sheet 12 additionally functioning as the cover member of the fuel tank 7 is curved such that a part extending from the fuel tank 7 to the air cleaner 9a is opened toward below. A space part communicated to the air cleaner 9a is formed between the rear part of the fuel tank 7 and the rear part of the bottom sheet 12.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an air intake system for a vehicle, and particularly to an air intake system suitable for use in a vehicle such as a motorcycle.

"Prior Art" Conventionally, intake devices used in vehicles such as motorcycles have structures such as those seen in, for example, Japanese Utility Model Application Publication No. 54-136250 and Japanese Utility Model Application Publication No. 56-111090. Already proposed.

In the former, an intake passage is formed between a tank rail of a motorcycle and a fuel tank installed over the tank rail, and intake air is taken in from the front opening of the intake passage. , An inverted U-shaped bottom plate provided across the frame was provided with a stacked plate at a distance from the bottom plate, and the gap between both bottom plates and the stacked plate was connected to the air cleaner inlet. It is something.

"Problems to be Solved by the Invention" The present invention aims to solve the following problems in the conventional technology described above.

In other words, in any of the above-mentioned technologies, the intake passage is provided inside the fuel tank, so when trying to secure the capacity of the fuel tank, the external shape becomes large. The problem is that if you set this, you will run out of capacity.

Further, due to the above-mentioned problems, the fuel tank tends to have a special shape, which not only complicates the processing but also causes problems such as making it impossible to use a ready-made fuel tank.

"Means for Solving the Problems" The present invention aims to provide an air intake system for a vehicle such as a motorcycle, which can effectively solve the conventional problems described above.
The intake device is used in a motorcycle, etc., which has an engine mounted approximately in the center of the body frame, wheels mounted at the front and rear parts, and a fuel tank and seat mounted in sequence behind the steering wheel. The fuel tank is covered by a cover member, and an air cleaner is disposed below the sort, and the air cleaner is communicated with a space formed between a rear part of the fuel tank and a rear part of the cover member. It is characterized by

"Function" The intake device according to the present invention has the above-mentioned configuration, which enables the formation of an intake passage by pressurizing the cover member, which is relatively easy to process, and which allows the intake passage to be formed by applying pressure to the cover member, which is relatively easy to process.
11] This is to minimize the size of the structure, thereby increasing the use of ready-made parts and making installation easier.

Furthermore, the cover member protects the fuel tank by absorbing or buffering external forces acting on the fuel tank.

"Embodiments" The present invention will be described in detail below based on embodiments shown in the drawings.

1 to 6 show a first embodiment of the present invention, and reference numeral 1 in FIG. 1 indicates a motorcycle to which this embodiment is applied, and a head pipe forming part of a body frame 2. 2a, a front fork 6 which is rotatably attached to the head vibrator 2a and includes a steering wheel 3, a front wheel 4, a front fender 5, etc.; The fuel tank 7 and the seat 8 are attached to the vehicle body frame 2 below them, and the seat 8 is attached to the vehicle body frame 2 at a position below these.
The engine 9 includes an air cleaner 9a located below the body frame 2, and a swing arm ti swingably attached to the lower rear part of the vehicle body frame 2 and having a rear wheel 10 attached to its swinging end. There is.

The sheet 8 is formed by integrally providing a flexible cushion material 13 on a bottom plate 12 whose lower part is made of a resin plate or the like,
As shown in FIG. 2, its front portion extends so as to cover almost the entire area above the fuel tank 7. As shown in FIG.

Therefore, in this embodiment, the bottom Vi, 12 is also used as a cover member for the fuel tank 7.

The bottom plate 12 is located at the front end of the cushion material 13, that is, at the second
As shown in the figure, it is provided to substantially cover the upper part of the vehicle body frame 2, leaving a non-overlapping portion 13a at a portion facing the cap 7a of the fuel tank 7.

The reason why the non-overlapping portion 13a is provided in this way is to leave flexibility in the portion of the sheet 8 located above the cap 7a, and to utilize this flexibility to open the top of the cap 7a. This is to do so.

The bottom plate 12 is connected to the vehicle body frame by a hook 14 at the middle part and by a stay 15 at the rear end.
Furthermore, as shown in FIGS. 2 and 5, the front part of the is connected to the fuel tank 7, thereby fixing the seat 8.

In addition, the bottom [12, as shown in FIGS. 2 to 5,
A portion from the fuel tank 7 to the air cleaner 9a is curved to open downward.
When attached to the vehicle body frame 2, a continuous gap along the length of the vehicle is provided between the fuel tank 7 and the air cleaner 9a, and a gap is provided between the rear part of the fuel tank 7 and the rear part of the bottom f2iE12. A space is formed in the space.

On the other hand, between the fuel tank 7 and the air cleaner 9a, as shown in FIGS. 2 to 4, a temporary seal 18 that closes the gap between the two is attached to the vehicle frame 2, The seal [18, the fuel tank 7 and the bottom plate 12 form an intake passage 19 whose front end is open to the rear of the head vibe 2a and whose rear end is connected to the air cleaner 9a through the space. There is.

The cross-sectional area of the intake passage 19 is adjusted by appropriately setting the curved shape of the bottom plate 12.

In this embodiment, the cap 7a is provided at a position shifted to one side in the width direction of the intake passage 19, as shown in FIG.

This is because the fuel tank 7 is generally formed in an inverted U shape so as to straddle the main vibe 2b of the vehicle body frame 2, as shown in the same figure, and when the fuel filler port is provided in the center, the fuel tank 7 and the tank There is a problem with the distance from the bottom making it difficult to check the liquid level when refueling. Therefore, in order to make it easier to check the liquid level during refueling, it is provided at a position shifted to one side.

Furthermore, bulges 7b are formed on both upper side edges of the fuel tank 7 to fit inside the seat 8 to create a labyrinth snort effect between them.

However, the intake device of this embodiment configured in this way is
By extending the front part of the bottom plate 12 of the seat 8 as a cover member to the upper part of the fuel tank 7, an intake passage 19 is formed by the upper surface of the fuel tank 7 and the lower surface of the bottom [12]. When forming the intake passage 19, the front part of the bottom plate 12 is processed to match the shape of the fuel tank 7, and then the bottom plate I2 is placed over the fuel tank 7, but the fuel tank 7 is not subjected to any special processing. There is no need,
In addition, the bottom plate 12 can be easily processed without being restricted by other structural members of the vehicle, and therefore a ready-made fuel tank 7 can be used, simplifying manufacturing.

On the other hand, the intake passage 19 formed in this way has its front end opened near the top of the vehicle behind the head vibe 2a, and has a labyrinth seal effect and The provisional seal 18 supplies air separated from the air around the vehicle.

Furthermore, since the front end of the intake passage 19 is opened near the top of the vehicle, clean air can be supplied even when driving off-road, for example.

Furthermore, in this embodiment, since almost the entire surface of the fuel tank 7 is covered by the seat 8, when the riding position is moved forward, etc., the rider is prevented from sitting directly on the fuel tank 7, and
The step between the surface of the seat 8 and the fuel tank 7 is eliminated to facilitate its movement.

Further, due to the flexibility of the cushion material 13 in the non-overlapping portion of the bottom plate 12 and the cushion material 13 provided at the front end of the seat 8, even when the cap 7a of the fuel tank 7 is covered with the sheet 8, the cap 7a can be exposed and removed.

7 and 8 show a second embodiment of the present invention, in which a cover plate 20 is attached to the bottom plate 12 of the seat 8 in the first embodiment so as to cover the opening facing downward. be.

With such a configuration, the intake passage 19
Improves the airtightness of the - layer to enable stable air intake.

9 to 11 show a third embodiment of the present invention,
At the rear end of the intake passage 19, a part of the bottom plate 12 is folded toward the vehicle body frame 2 at a portion facing the area extending from the gap between the fuel tank 7 and the air cleaner 9a to above the air cleaner 9a. A partition wall 21 that is curved to close the intake passage 19, a partition wall 22 that is continuous with the partition wall 21 and is formed to close the upper part of the air cleaner 9a, and discontinuous portions of the side partition walls 21 and 22. and a sub-plate 23 provided to cover the side portion of the cavity 24.
Through holes 21a and 22a are formed in the partition walls 21 and 22, respectively, and the cavity 24 is communicated with the intake passage 19 and the air cleaner 9a. It is configured to be positioned slightly above the top surface of the tank 7.

With this configuration, the bottom plate 12 and the seal plate 18 in the first embodiment described above are integrated, and when the seat 8, the seal [18, etc.] are assembled, the positioning of each component can be easily and reliably made. This simplifies assembly work.

Further, by forming the through hole 21a slightly higher than the upper surface of the fuel tank 7, even if water or the like enters the intake passage 19, it can be guided to the outside by the partition wall 21.

FIG. 12 shows a fourth embodiment of the present invention, in which the cover plate 20 and seal plate 18 shown in the second embodiment described above are shown.
A cover plate 25 is integrally attached below the bottom plate 12, and a through hole is provided in the cover plate 25 at a position facing the air cleaner 9a to communicate the air cleaner 9a and the intake passage 19. 25a is formed.

With this configuration, the airtightness of the intake passage 19 formed between the fuel tank 7 and the bottom plate 12 can be further improved.

FIG. 13 to FIG. 15 show a fifth embodiment of the present invention. In the non-overlapping portion 13a of the bottom 11i212 and the cushion material 13 shown in the first embodiment, a A backing plate 26 made of, for example, synthetic resin, which is elastically deformable, is integrally provided.

For example, when the cap 7a is installed so as to protrude above the seat 8, the shape of the cushion material 13 at the joint between the cap 7a and the seat 8 becomes complicated. Bottom plate 1
However, if the bending radius of the bottom plate 12 cannot be set sufficiently, it may be difficult to form the bottom plate 12.

In this embodiment, the backing plate 26 provided at the mating portion allows
This makes it easy to form the shape of the mating part, and its elasticity makes the load applied to the razor gentle or uniform.

Furthermore, FIGS. 16 and 17 show a sixth embodiment of the present invention, in which an air cleaner element 27 is provided continuously to the through hole 25a in the fourth embodiment.

Specifically, the air cleaner element 27 is mounted on an element set box 28 which is fastened together with the bottom plate 12 to the vehicle body frame 2 and is disposed opposite to the through hole 25a. 28 and a seal plate 30 attached by bolts 29.

Seal rubbers 31 and 32 are interposed in a compressed state between the contact surfaces of the air cleaner element 27 and the element set box 28 and between the contact surfaces of the seal plate 30 and the cover plate 25, respectively. A connecting tube 34 is provided at the bottom of the element set box 28 to connect the element set box 28 and the carburetor 33 of the engine 9.
are connected.

By adopting the above-mentioned configuration, the communication between the intake passage 19 and the engine 9 is simplified to facilitate intake, and the structures around the engine 9 are made as small as possible to ensure a smooth flow of air. 9 intake efficiency can be increased.

Note that the detailed shapes and dimensions of the constituent members shown in each of the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like.

"Effects of the Invention" As explained above, according to the air intake system for a vehicle such as a motorcycle according to the present invention, the fuel tank is covered with a cover member, an air cleaner is disposed below the seat, and the fuel tank is covered with a cover member. Since the air cleaner communicates with the space formed between the rear part of the fuel tank and the rear part of the cover member, there is no need to perform any special processing on the fuel tank when forming the intake passage, and the air cleaner is connected to the space formed between the rear part of the cover member. Processing can be easily performed without being restricted by other components of the vehicle,
Therefore, it is possible to use an off-the-shelf fuel tank, which simplifies the manufacturing process. In addition, even when changing the shape of the riding position, the cover member can be easily processed as described above, so that it can be used at JB speed. can be accommodated.

In addition, the intake passage is opened near the top of the vehicle at its front end or behind the head pipe, and is separated from the air around the vehicle by the fuel tank and bottom plate, so that clean air can be supplied. It has excellent effects such as being able to perform

[Brief explanation of drawings]

1 to 6 show a first embodiment of the present invention, FIG. 1 is a side view of a motorcycle to which one embodiment is applied, and FIG.
The figure is an enlarged view of the main part, Figures 3 to 5 are cross-sectional views taken along lines III-III, IV-IV, and ■-■ in Figure 2, respectively, and Figure 6 is a cross-sectional view of Figure 2. ■A view taken along the -Vt line, FIGS. 7 and 8 show the second embodiment of the present invention. FIG. ■−
■A sectional view taken along the line, FIGS. 9 to 11 show the third embodiment of the present invention. FIG. 9 is the same as FIG. 2, and FIGS. 1O and 11 are respectively FIG. 9 is a sectional view taken along the X-X line and Xt-Xt line, FIG. 12 is a view similar to FIG. 2 showing the fourth embodiment of the present invention, and FIGS. 13 to 15.
The figures show a fifth embodiment of the present invention, in which Fig. 13 is an enlarged sectional view of the main part, Fig. 14 is an enlarged sectional view showing the vicinity of the fuel tank, and Fig. 15 is taken along the line xv-xv in Fig. 14. 16 and 17 show a sixth embodiment of the present invention, and FIG. 16 is a partially omitted side view of the vehicle, and FIG.
FIG. 7 is an enlarged sectional view of the main part. 1...Motorcycle, 2...Body frame, 2a...
・Head pipe, 2b...Main vibe, 7...Fuel tank, 7a...Cap, 8.../-t,
9...Engine, 9a...Air cleaner, 1
2... Bottom plate (cover member), 13... Kunyong material, 13a... Non-overlapping part, 18... Seal plate,
19... Intake passage, 20, 25... Cover plate, 21, 22... Partition wall, 21a, 22a, 25a... Through hole, 23... Sub plate, 24... Cavity part, 26 ...Top plate, 27.Air cleaner element, 28.Element set box 30.Seal plate.

Claims (1)

[Claims] In a motorcycle, etc., which has an engine mounted approximately in the center of the body frame, wheels mounted at the front and rear parts, and a fuel tank and a seat mounted in sequence behind the steering wheel, the fuel tank is covered by a cover member. and an air cleaner is provided below the sheet,
An air intake system for a vehicle such as a motorcycle, characterized in that the air cleaner is communicated with a space formed between a rear part of the fuel tank and a rear part of the cover member.