JPS5943493Y2 - Internal combustion engine air cleaner - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air cleaner for internal combustion engines such as motorcycles.

This type of air cleaner consists of an air cleaner body containing a filter material therein and an intake pipe attached to the case.

In this case, the inside of the air cleaner body becomes a resonance chamber, and the intake pipe becomes its throat, causing the entire air cleaner to resonate and generate noise.

In order to make this resonance tube smaller, the volume within the air cleaner body is increased.

Alternatively, the internal cross-sectional area of the intake pipe may be reduced or the length may be increased.

However, the air cleaner main body cannot be made too large due to reasons such as placement on the vehicle body.

Further, the internal cross-sectional area of the intake pipe is necessarily determined in relation to the output of the engine.

Therefore, the length of the intake pipe can be increased to a certain extent, but if the length is increased to a certain extent, the noise due to the resonance of the entire air cleaner will be reduced, but there is a problem that the intake pipe itself will resonate and produce a harsh sound.

This proposal aims to solve the above problems,
Multiple intake pipes 21 to 2 of different lengths of the air cleaner 1
4, and each adjacent intake pipe 21, 22, 23, 2
4 are connected in the middle.

In the illustrated example, the air cleaner main body is divided into upper and lower halves 1a and 1b as shown in Figs. 1 to 3, and four intake pipes 21 to 24 are provided, two each on the left and right sides of the upper part of the main body 1a, to synthesize the whole body. It is integrally molded from resin or the like.

The two intake pipes 21, 22, 23, and 24 on the left and right have different lengths at their upper parts, and are lined up in the front and rear direction.
As shown in the figure, it is integrally formed into an 8-shaped cross section, and a communication hole 3 is provided at an intermediate position in the length direction.

The illustrated example is a long intake pipe 21, 23, and a short intake pipe 2.
2.24 were formed to the same length, but each intake pipe 2
All of the lengths from 1 to 24 may be different.

In addition, the internal cross-sectional area may be made different, and the entire intake pipe 21
The sum of the cross-sectional areas of the inner space 24 is designed to have a predetermined thickness determined in relation to the output of the engine.

The intake pipes 21 to 24 are connected to the upper body 1 when arranged on the vehicle body.
Two of them are placed on the sides of the upper part of the a, and the openings inside the main body are located above each element 6, but since air is sucked in from the sides of each element 6, the main body The opening opens diagonally toward the wall and prevents air from stagnation above the element 6 so that the air that enters inside flows along the wall and improves suction efficiency.

Said split air cleaner body 1a, 1b &! The openings are aligned and fixed with bolts 4, etc., and an element 6 is arranged around the inner end of the air pipe 5 attached to the lower body 1bl/I:jW, and a rubber bush I attached to the upper body 1a.
The element 6 is suppressed and supported from above.

Reference numeral 8 denotes a mounting protrusion formed integrally with the upper main body 1a, and a bolt 9 or the like is inserted into the hole 8a to attach it to the body 10 of a two-wheeled motor vehicle as shown in FIG.

11 is a tire brake, 12 is an engine, and 13 is a front wheel.

Since the present invention has the above-mentioned configuration, the length of the intake pipes as a whole is made sufficiently long with respect to the total internal cross-sectional area of the intake pipes 21 to 24, thereby reducing the resonance sound of the entire air cleaner.

In this case, each intake pipe 21 to 24 has a different length, and the distances t1 and t2 from the outer end of the pipe to the communication hole and the distance t3 from the communication hole to the inner end form an air column with both ends open. Since the resonant sound is dispersed into individual resonant sounds, the resonant sound of the intake pipe itself becomes less unpleasant to the ears as a whole, and the resonant sound generated in the intake pipe on the side of the image interferes with each other due to the communication hole and has the effect of being muffled.

Note that the shape of the communicating hole may be any shape such as a long hole, and if the diameter is too small, the effect will be small, and if it is too thick, it will be difficult to manufacture.

According to experiments, its thickness is 1 of the internal cross-sectional area of the intake pipe.
/2 to 2/3, and the effective position is about 1/4 to 1/2 of the length of the longer intake pipe from the end on the main body side.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional side view of the proposed air cleaner, Figure 2 is its plan view, Figure 3 is a sectional view taken along the line ■-■ in Figure 1, and Figure 4 is the
FIG. 5 is a sectional view taken along the line RV-IV, and FIG. 5 is a side view of a part of a motorcycle equipped with the air cleaner of the present invention. 1 is an air cleaner, 1a and 1b are air cleaner bodies, 2
1 to 24 are intake pipes.

Claims (1)

[Scope of utility model registration request] By using multiple air cleaner intake pipes with different lengths,
An air cleaner for an internal combustion engine that connects adjacent intake pipes in the middle.