JPS6045305B2 - Air cleaner inlet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cleaner inlet used in an internal combustion engine.

The internal combustion engine is supplied with air purified by an air cleaner.

Intake in an internal combustion engine occurs intermittently and rapidly, and an intake noise is generated each time the engine takes air. In particular, noise in the low frequency range can be muffled by making the air cleaner inlet a thin and long pipe.
This is possible for vehicles with large engine compartments, such as automobiles, but it is impossible for vehicles with limited space, such as motorcycles. Also, instead of making the intake port thinner and longer, the first
As shown in the figure, the suction port B provided on one side of the air cleaner body A is sometimes used as an oil passage, but this causes a lot of resistance at the bending part and reduces the engine output. The present invention has been improved in view of the above points, and the present invention will be described below with reference to an embodiment shown in FIG.

In FIG. 2, there is a circle on one side of the cleaner body 1.

A cylindrical suction pipe 2 is installed upright, and a spiral plate 3 is installed inside the suction pipe 2.
is inserted to provide a spiral suction passage 4, and a thin tube 5 is inserted into the center of the spiral plate 3 concentrically with the suction tube 2, and a small hole 6 is bored in the thin tube 5. By forming the inside of the short suction pipe 2 into a spiral suction passage 4, the suction passage 4 can be made substantially longer and good muffling in the low frequency range can be achieved. The thin tube 5 has a short length to muffle noise in a high frequency range, and the thin tube 5 and the spiral suction path 4 having different lengths simultaneously muffle noise at frequencies with different wavelengths. Furthermore, since the two types of suction paths inside and outside the thin tube 5 are communicated with each other by the small holes 6, they mutually interfere and resonate, and the suction noise is further attenuated and muffled. As explained above, the present invention inserts a spiral plate into the suction pipe installed upright in the cleaner body to form a spiral suction path, which allows the inside of the short suction pipe to become a substantially long suction path. can effectively silence noise.

And since the suction tube is short, it is convenient to install without taking up much space. In addition, the spiral suction path is gently curved along its entire length,
There is little resistance. Moreover, since a thin tube is provided in the center of the spiral plate, two types of suction paths are formed: a spiral suction path and a thin tube, and noise with different wavelengths can be muffled. Therefore, the intake noises sucked into both intake passages are mutually attenuated, and the silencing effect is improved. In this way, the air cleaner as a whole is small and has a noise-reducing effect, and suction resistance can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing a conventional example, and FIG. 2 is a horizontal sectional view showing an embodiment of the present invention.

DESCRIPTION OF SYMBOLS 1...Cleaner body, 2...Suction pipe, 3...Spiral plate, 4...Spiral suction path, 5...
...tubule, 6...small pore.

Claims (1)

[Claims] 1 Insert a spiral plate with a thin tube in the center into the suction tube installed upright in the cleaner body, provide two types of suction paths: a thin tube and a spiral path, and provide small holes in the thin tube to create two types of suction paths. An air cleaner inlet characterized by having communication in the middle.