JPH0218267Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a muffler, and more particularly to the structure of a muffler that is small and simple in structure but has a large muffler effect.

Conventionally, in order to effectively reduce engine noise using a muffler, it is necessary to improve the flow of engine exhaust within the muffler and increase the sound attenuation effect due to exhaust expansion and mutual interference. Not only does the internal structure become more complex in proportion to the silencing effect, but the muffler as a whole becomes larger, and the muffler as a whole becomes larger, such as forming multiple compartments connected by perforated pipes within the muffler, as well as branching and merging passages for exhaust gas. The disadvantage is that resistance also increases.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and for this reason, the sound-absorbing muffler according to the present invention is provided with a partition plate that crosses almost the entire inside of the main case on the inside of the main case provided with an inlet and an outlet. A plurality of hooded openings are provided in a partition plate by partial punching, the punching is performed from the front and back surfaces of the partition plate, and the opening directions are distributed in multiple directions, and the partition plates are arranged non-parallel to each other. It is characterized by consisting of a partition plate. In the present invention, the partially punched openings provided in the partition plate not only exhibit a silencing effect due to the expansion of the exhaust gas, but also exhibit a silencing effect due to mutual interference by dispersing and colliding the exhaust gases.

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

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a sound-reducing muffler according to the present invention, in which 1 is a main body case, 3
and 5 are an inlet and an outlet having dispersion holes provided in the bottom surface 1a and the center of the top surface 16 of the main body case, respectively, and are connected to and opened to the exhaust manifold of the engine and the atmosphere, respectively. The main body case 1 has a side wall 1c that is approximately circular or oval in cross section.
and the substantially conical top surface 1b and bottom surface 1a. Inside the main body case 1, there are a partition plate 7 on the entrance 3 side that crosses almost the entire inside of the main body case, and a partition plate 9 on the exit 5 side that is arranged at an angle so as not to be parallel to the partition plate 7 on the entrance side. is provided, so that the inside of the main case is divided into three compartments 11a, 11
It is divided into 11b and 11c. As shown in FIGS. 2 and 3, each of the partition plates 7 and 9 has a large number of openings 15 with hoods 13 partially punched out from the front and back sides of the partition plate. For this reason, it is desirable that the partition plates 7 and 9 be made of a soft metal material such as aluminum or copper. In addition, the opening 1
The directions No. 5 are distributed in multiple directions so as not to be biased toward a specific direction.

In this way, the partition plates 7 and 9 have a large number of hooded openings 15 whose punching directions and opening directions are distributed.
By providing this, the exhaust gas flow from the inlet 3 passes through the punched openings 17 and the hood opening 15 of the partition plates 7 and 9 to the partition on one side of the partition plate, as shown by the arrow in FIG. When passing from the chamber to the compartment on the other side, a silencing effect occurs due to expansion, and the gas flows passing through the other side collide with each other, resulting in a silencing effect due to interference. Moreover, since the gas flow does not directly pass through the openings of the partition plates, but passes after colliding with the partition plates 7, 9 or the hood 13, the silencing effect due to the collision is also superimposed. Furthermore, since the partition plate 7 is inclined with respect to the partition plate 9 as described above, each compartment 11a,
11b and 11c have non-uniform heights in the lateral direction, as shown in FIG. 1, so that an effective sound deadening effect can be obtained over a wide frequency band.

In this way, by simply providing the hooded openings 15 in the partition plates 7 and 9, which have simple shapes, it is possible to obtain a noise reduction effect caused by expansion, interference, and collision, which not only simplifies the internal structure of the muffler, but also makes the entire muffler smaller and lighter. and without substantially increasing exhaust resistance.

In the above embodiments, the main body case 1 has a circular cross section or an elliptical cross section, but it may have other shapes. Further, in the above embodiment, two upper and lower partition plates 7 and 9 are used, but depending on the purpose, one partition plate or two or more partition plates may be used.
Furthermore, if desired, a sound absorbing material can be provided on the inner surface of the main body case 1 to further enhance the sound deadening effect.

As described above, according to the present invention, the exhaust gas that enters the main body case not only receives the silencing effect due to expansion when passing through the openings of each partition plate and the silencing effect due to reflection from each partition plate, but also has a silencing effect in each compartment. Excellent noise reduction effects can be achieved because the noise reduction effect is achieved by the dispersion of the hood directed in multiple directions and by the collision between the exhaust gases after passing through the partition plate openings. In addition, in the present invention, since the partition plate is made up of multiple partition plates arranged non-parallel to each other, compartments with uneven heights are formed within the main body case, which makes it possible to effectively transmit signals over a wide frequency band. It can have a sound-deadening effect. Therefore, according to the present invention, the structure is simple and the size and weight can be reduced.
Moreover, a noise muffler is provided that can exhibit an efficient noise reduction effect without increasing exhaust resistance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a muffler according to the present invention, FIG. 2 is a partial perspective view showing the shape of the opening of a partition plate, and FIG. 3 is a partial cross-sectional view of the same partition plate. 1...main case, 3...inlet, 5...exit,
7, 9... Partition plate, 13... Hood, 15... Opening.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A partition plate is provided inside the main case that is provided with an inlet and an outlet, and the partition plate crosses almost the entire inside of the main case, and a large number of hooded openings are provided in the partition plate by partial punching, A sound deadening muffler characterized in that the punching is performed from the front and back surfaces of the partition plate, the opening directions are distributed in multiple directions, and the partition plate is composed of a plurality of partition plates arranged non-parallel to each other. (2) The sound-absorbing muffler according to claim 1, wherein a sound-absorbing material is stretched over the entire inner wall of the main body case. (3) The noise reduction device according to claim 1 or 2 of the utility model registration claim, wherein the main body case has a substantially circular or elliptical cross-sectional shape, and has an outlet and an inlet at the center of the upper and lower surfaces of the main body case, respectively. scarf.