JPH087052Y2 - Engine muffler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an engine muffler.

<Prior Art> As a prerequisite structure of the present invention, as shown in FIG. 1, for example, a muffler constructed by connecting an exhaust outlet 4 to an exhaust inlet 2 through a plurality of muffling chambers 3 in a muffler main body 1. Regarding

Conventionally, the muffler has a structure in which a hole or the like is formed in an exhaust passage or a partition plate in a muffling chamber, and exhaust noise is reduced by resistance of the hole or the like.

<Problems to be Solved by the Invention> However, there is a limit in reducing exhaust noise within the limited space of the silencing chamber, and sufficient silencing performance cannot be obtained, and exhaust noise is high.

An object of the present invention is to provide a muffler that can obtain sufficient silencing performance in a limited space of a silencing room.

<Means for Solving the Problems> In order to solve the above problems, the present invention is configured as shown in FIG. 1, for example.

That is, the muffler body 1 has a plurality of muffling chambers 3 at the exhaust inlet 2.
In the muffler of the engine configured so that the exhaust outlet 4 is communicated with each other through 3 ..., The silencer 5 having a ventilation gap in the entire final muffling chamber 3 and in the tail pipe 8 led out from the exhaust outlet 4. Is filled.

<Operation> Next, the operation will be described with reference to FIG. 1, for example.

That is, the exhaust gas flowing from the engine into the exhaust gas inlet 2 is discharged from the exhaust gas outlet 4 through the tail pipe 8 after passing through the plurality of muffling chambers 3 ...

On the other hand, the noise due to the exhaust from the engine is reduced by each muffling chamber 3, and interference and sound absorption are promoted by diffuse reflection while passing through the entire muffling chamber 3 and the muffling material 5 filled in the tail pipe 8. It is done and it is muted enough.

<Advantages of the Invention> The present invention has the following effects because it is configured and operates as described above.

Exhaust noise is silenced by the sound deadening material filled in the final silencing chamber and in the tail pipe.Therefore, in addition to the silencing action of exhaust noise in the tail silencing chamber, the silencing performance of exhaust noise is added. Can be higher

In other words, the space inside the tail pipe that was only passed through the exhaust gas will be used for silencing the exhaust noise, so that the space inside the tail pipe can be effectively used and the silencing chamber can be divided by the tail pipe to share the silencing of the exhaust noise. The muffler body can be made smaller than when exhaust noise is silenced only by itself.

<Embodiment> Next, an embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, an intake pipe 9 is connected to a muffler of an engine, and a porous (exhaust inlet) 2 opened at a tip end of the intake pipe 9 has a first muffling chamber 3 of a muffler body 1 of the muffler. It is open inside.

The muffler body 1 includes a first silencing chamber 3 and a second silencing chamber 3
And the partitioning plate 10 are partitioned from each other, the two silencing chambers 3 are communicated with each other by a multi-hole formed in the inner pipe 7, and the second silencing chamber 3 and the third silencing chamber (final silencing chamber) 3 Partitioned by a partition plate 11, both silencing chambers 3 are communicated with each other by a multi-hole (inlet) 6 opened in the partition plate 11.

The third silencing chamber 3 is filled with a stainless net (silence material having a ventilation gap) 5 over the entire area.

This stainless steel net 5 has a wire diameter of 0.5 and a mesh of 0.15 to 0.17 g per 1 cc of engine volume (displacement).
And the third silencing chamber 3 is filled with 25 g.

As shown in FIG. 4, the exhaust outlet 4 opened in the third silencing chamber 3 is opened at a position where it does not overlap the inlet 6 in a top view, and the tail pipe 8 is led out from the exhaust outlet 7. .

The stainless net 5 is also placed in the tail pipe 8.
It is filled with 2.5g, and this stainless steel net 5 has 12 nails.
It is installed in.

 In the figure, 13 is a cover.

FIG. 6 shows, as an experimental result, a relationship diagram between the frequency (Hz) of exhaust noise and the sound pressure (dB) in the present invention and the conventional example. Graph A shows the present invention and graph B shows the conventional example. In the audible range, the present invention has lower noise than the conventional example.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a longitudinal side view of a muffler, FIG. 2 is a schematic side view of the muffler, and FIG.
Fig. 3 is a sectional view taken along the line III-III, Fig. 4 is a sectional view taken along the line IV-IV, Fig. 5 is a schematic sectional view of the tail pipe, and Fig. 6 is a graph showing exhaust noise frequency and sound pressure in the present invention and the conventional example. FIG. 1 ... Muffler body, 2 ... Exhaust inlet, 3 ... Silencer room, 4
…… Exhaust outlet, 5 …… Silence-eliminating material, 8 …… Tail tube.

Claims (1)

[Scope of utility model registration request] 1. A muffler body (1) having an exhaust inlet (2) through a plurality of muffling chambers (3), (3).
In a muffler of an engine configured to communicate with each other, a muffling material (5) having a ventilation gap is provided in the entire final muffler chamber (3) and in the tail pipe (8) led out from the exhaust outlet (4). An engine muffler characterized by being filled.