JPS6340072Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air intake device suitable for use in an air cleaner mounted on a vehicle, particularly an off-road tricycle.

Since off-road tricycles are equipped with wide, ultra-low-pressure tires called balloon tires and run in harsh environments with a lot of sand and dust, such as sand, rough ground, grassland, and muddy ground, air cleaners should also be compared. In addition to mounting a large-sized object, the air intake has also been carefully positioned to prevent sand and dust from entering.
Shape etc. are taken into consideration.

Therefore, this type of air intake usually connects the air cleaner mounted at the rear of the engine's cylinder unit to the rear of the main pipe (main frame) that extends rearward from the head pipe that supports the front fork. By providing an air intake port that communicates with the atmosphere at the front of the vehicle, the intake port is located at the front and upper part of the vehicle body, thereby preventing the influence of dust, etc., generated by the front steering wheels while driving. It is configured to avoid this as much as possible.

However, in most conventional air intakes, the air intake is simply an opening that communicates with the atmosphere, and for this reason, sand and dust existing near the air intake are easily sucked in by the negative pressure from the engine side. The reality is that sufficient exclusionary effects cannot be obtained.

The present invention is an improvement on the conventional air intake, which effectively separates the air from unnecessary foreign matter in the atmosphere such as sand, dust, rain, and snow, and provides a vehicle with a sufficient foreign matter removal effect. The purpose is to provide an air intake device for.

To achieve this purpose, the present invention is particularly applied to vehicles such as off-road tricycles, and its main configuration is to provide an air intake port communicating with an air cleaner in a side plate substantially parallel to the running direction of the vehicle; The side plate is provided with a tunnel-shaped shield plate that covers the air intake port and communicates with the air intake port to form a substantially horizontal uniform cross-section ventilation path, thereby introducing air from which foreign substances have been effectively separated. It is characterized by being able to do the following.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a schematic side view of an off-road tricycle to which the air intake device according to the present invention is applied, Fig. 2 is an enlarged extracted view of the main parts, Fig. 3 is a sectional view taken along the line 3-3 in Fig. 2, FIG. 4 shows a sectional view taken along the line 4--4 in FIG. 2, respectively.

First, in order to clarify the present invention, the overall schematic structure of an off-road three-wheeled vehicle will be explained with reference to FIG. Reference numeral 1 denotes an off-road tricycle, and the body frame 2 includes a main pipe 4 extending rearward from the upper part of the head pipe 3 and forming a main frame, and a down tube 5 extending rearward and downward from the lower side of the head pipe 3. A front fork 8 is supported by both bottom bridges 6 and 7, a steering front wheel 9 is supported at the bottom of the front fork 8, and a handle 10 is attached to the top of the top bridge 6. On the other hand, main pipe 4
A fuel tank 11 is mounted on top, and a seat 12 is further mounted behind it. Further, an engine unit 13 is mounted at the rear lower part of the down tube 5, and a pair of left and right rear driving wheels 1 is mounted behind this engine unit 13.
4 and 14 are supported by a swing arm 15, and the swing arm 15 is supported by a damper device (not shown) interposed between the vehicle bodies.

On the other hand, the rear part of the cylinder unit 13a of the engine unit 13 is connected to a carburetor 16 and then to an air cleaner 17, and the upper part of this air cleaner 17 is connected to the rear part of the main pipe 4, and the inside of this main pipe 4 is connected to the air cleaner 17. Connects with 17. On the other hand, an air intake device 18 is disposed at the front of the main pipe 4 according to the present invention, and air is supplied to the air intake device 18, the inside of the main pipe 4, the air cleaner 17, and the carburetor 16.
It passes in this order and is sucked into the engine unit 13 side.

This air intake device 18 is specifically constructed as shown in FIGS. 2 to 4. In each of these figures, the same parts as in FIG. 1 are given the same reference numerals to clarify the structure.

First, a pair of left and right head pipe gusset plates 19 and 20 are attached to the rear portions of the side plates 19a and 20a by bending them inward to form rear closing edges 19b and 20b.
The periphery of the head pipe 3, main pipe 4,
The air chamber S is closed by the head pipe 3, the main pipe 4, the down tube 5, and the gusset plates 19 and 20 by welding them to the sides of the down tube 5 and by welding the rear closing edges 19b and 20b to each other. form. The main pipe 4 facing the air chamber S is provided with a plurality of holes 21 and 22 passing through the pipe to communicate the air chamber S with the air cleaner 5.

On the other hand, each side plate 19a of the gusset plates 19, 20,
20a are parallel to each other in consideration of the widths of the rear closing edges 19b and 20b, that is, in the traveling direction of the vehicle (third direction).
Both side plates 19a and 20a are installed parallel to the direction of arrow A in the figure.
Holes (in the embodiment, elongated holes 23 and 24 that are long in the substantially horizontal direction) are bored at predetermined positions of 0a, and air intake ports S ₁ and S ₂ are formed.
Open.

In addition, the side plates 19a and 20a have the above air intake holes.
Tunnel-shaped shielding plates 25 and 26 are provided which cover S ₁ and S ₂ and communicate with these intake ports S ₁ and S ₂ to form substantially horizontal equal-section ventilation passages S ₃ and S ₄ .

The shielding plates 25 and 26 have, for example, a substantially U-shaped cross section, and the side portions are formed with an inclined front portion with the upper portion protruding forward to prevent the intrusion of rain, etc. Mounting brackets 27, which are integrally bent, are provided on the upper and lower edges, and the side plates 19a,
Attach and fix to 20a.

Next, the air intake device 18 having such a configuration
Explain the functions of.

The side plates 19a, 20a are provided parallel to the vehicle running direction, and tunnel-shaped shielding plates 25,
Since the ventilation passages S ₃ and S ₄ formed at 26 also have equal cross sections and are substantially parallel to the horizontal direction, the opposing air flows through the ventilation passages without any resistance when the vehicle is running.
Passes through S ₃ and S ₄ . In this case, the air taken in from the front of the ventilation paths S ₃ and S ₄ is contaminated with foreign matter such as sand and rain, but if no negative pressure is generated in the air intake ports S ₁ and S ₂ , All the air taken in (including foreign matter) quickly passes through the ventilation paths S ₃ and S ₄ and is discharged to the rear.

However, if negative pressure is generated in the air intake ports S ₁ and S ₂ due to negative pressure on the cylinder unit 13a side, relatively lightweight air is sucked in from the air intake ports S ₁ and S ₂ in response to this negative pressure. However, relatively heavy foreign matter passes through the ventilation paths S ₃ and S ₄ and is discharged as is. As a result, a so-called rectification effect occurs and air and foreign matter are separated. In order to perform this rectification effect well, an air intake port is installed corresponding to the negative pressure on the cylinder unit 13a side.
The opening areas of S ₁ and S ₂ and the cross-sectional areas of ventilation paths S ₃ and S ₄ are taken into consideration.

Note that it is extremely important to form the ventilation passages S ₃ and S ₄ in a substantially horizontal direction and with equal cross sections according to the present invention. If the ventilation passages S ₃ and S ₄ are sloped in the vertical direction or are not formed with equal cross-sections, turbulent flow such as eddy flow will occur in the ventilation passages and air resistance will increase, resulting in the above-mentioned The rectification effect that separates the air and foreign matter is not sufficiently performed, resulting in foreign matter being drawn into the air intake port.

In FIGS. 2 and 3, solid line arrows a indicate the flow of air containing foreign matter, and dotted line arrows b indicate the flow of air taken into the air cleaner by the air intake device.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the side plates 19a and 20a provided with the air intake ports S ₁ and S ₂ may be formed using head pipe gussets in order to improve parts cost, manufacturability, etc. Although a plate is used, it is also possible to form a side plate part directly parallel to the running direction on the side of the main pipe 4, or to form it in a box body with the air chamber S separately provided. Various shapes such as a semicircle can be applied to the cross-sectional shape of 26, and other arbitrary changes such as the shape of each part and the mounting position without departing from the gist of the present invention are permitted.

Further, in the embodiment, an example in which the present invention is applied to an off-road tricycle has been described, but it can be similarly applied to various vehicles such as motorcycles and even four-wheeled vehicles.

As is clear from the above explanation, the air intake device according to the present invention removes unnecessary sand and dust from the atmosphere.
It can effectively separate foreign substances such as dust and rain, and allow air free of these foreign substances to be introduced into the air cleaner.
It is suitable for vehicles such as off-road vehicles that are forced to drive in areas with a lot of sand and dust, and its configuration also provides sufficient effects with only a single shielding plate, is easy to manufacture, and is extremely low cost. It can be implemented as an air intake device with high technical and practical value.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of an off-road tricycle to which the air intake device according to the present invention is applied, Figure 2 is an enlarged extracted view of the main parts of Figure 1, and Figure 3 is 3 in Figure 2.
4 is a sectional view taken along line 4-4 in FIG. 2. In the drawing, 17 is an air cleaner, 19a, 20
a is a side plate, 25 and 26 are shielding plates, S ₁ and S ₂ are air intake ports, and S ₃ and S ₄ are ventilation paths.

Claims (1)

[Scope of utility model registration request] An air intake port communicating with the air cleaner is provided in a side plate substantially parallel to the running direction of the vehicle, and a substantially horizontally uniform cross-section ventilation path is provided in the side plate, covering the air intake port and communicating with the air intake port. An air intake device for a vehicle, characterized in that it is provided with a tunnel-shaped shielding plate.