JPS60135619A - Muffler of internal-combustion engine - Google Patents

Abstract

PURPOSE:To contrive to facilitate manufacture and to realize a small-sized lightweight muffler by a structure wherein a muffler main body consists of a standardized molded body obtained by compression-treating non-metallic sound attenuating material and, in addition, rugged surface is formed on the inner surface of the muffler. CONSTITUTION:A muffler main body 8 consists of a standardized molded body 9 obtained by compression-treating non-metallic sound attenuating material and rugged surface 10 is formed over the whole zone of the inner surface of the muffler. Consequently, a larger sound absorbing area is obtained, resulting in improving a sound attenuating effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffler provided in an exhaust system of an internal combustion engine.

Conventionally, as a generally known muffler,
Some mufflers have a silencer body comprised of a steel outer shell and a glass cooler attached to the inner surface of the outer shell.

The problem with such a silencer is that the outer shell of the silencer body is made of steel, which increases its weight, and the silencer body is constructed of 2x11/# with a steel outer shell and a glass and wool layer. Therefore, there is a drawback that manufacturing is complicated and costs are high.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a muffler that has a light lid, has a simple structure, can be manufactured at low cost, and has an excellent sound muffling effect. be.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is an overall -j side view of the motorcycle, and in the figure 1tX
A frame, 2 an engine, and 3 an exhaust system connected to an exhaust boat of the engine 2. The exhaust system 3 includes an upstream exhaust pipe 4 and a downstream muffler 6 connected and fixed to the end of the exhaust pipe 4 with a retaining ring 5.
It is composed of.

As shown in FIG. 2, the muffler 6 has a muffler main body 8 that leaks through an exhaust gas passage 7. The muffler main body 8 includes two muffler main body structures 9 (only one of which is shown in the figure) made of glass wool shaped by compression processing.
The muffler main body 8 has a structure in which it is integrally joined with a heat-resistant adhesive, and the outer surface of the muffler body 8 is impregnated and hardened with a heat-resistant resin.

The lrs muffler main body 8 is formed into a cylindrical shape whose diameter increases gradually in the direction of exhaust gas flow, that is, from the left end to the right end in the figure, and has a continuous cross-sectional wave ζ at a predetermined point in the middle part in the hull direction.
A concavo-convex portion 10 having a shape is formed so as to extend in the local direction. 11 is a lid that closes the end of the silencer main body 8.

Partition walls 12.13 are arranged at intervals at fixed locations inside the muffler 80, thereby dividing the internal exhaust gas passage 7 of the muffler main body 8 into 3 chambers 14 + 15.16. There is. The partition walls 12 and 13 are fixed within the muffler main body %B by having their local parts fitted into kM-shaped recesses formed on the inner surface of the muffler main body 8.

Inside the silencer main body 8, a pipe 1 is provided which penetrates the partition wall 12, the partition wall 13, and 3 to communicate the first chamber 14 and the third chamber 16.
7. A pipe 19 that penetrates the M wall 13 and communicates the second chamber 15 and the third chamber 16 with the outside of the second chamber 15 is provided. There is.

The lever and the engine 2 are connected to the silencer 6 configured as described above.
The gas discharged from the exhaust pipe (enters the first chamber 14 through the Eve 4 and communicates with it) (enters the third chamber 16 through the Eve 17 and communicates with it) and the Excite gas exhaust gas passes through the Eve 18 pI: and enters the second chamber 15.
It then passes through the communication tube 191 and is emitted to the outside, during which time it is repeatedly compressed and expanded to muffle the sound. In this case, the silencer body 8 is made of molded glass wool.

The sound-absorbing effect of the molded glass cooler provides a high level of sound deadening. Furthermore, the internal surface of the silencer body 8 has an uneven portion 1.
0°C is formed over the entire area.

Since the sound-absorbing area is large, even higher sound-dampening effects can be obtained.

Further, in the silencer 6 having the above configuration, the silencer main body 81j
It is made only by the f-molded glass cooler, and this molded glass cooler has both the function of the box body and the function of the sound-absorbing material, so it is lightweight, has a simple structure, and can be manufactured at low cost. The outer surface of the molded glass core that makes up the Shinki main body 8 is impregnated with heat-resistant resin to give it the same strength as FRP, so it has a strength equal to or greater than that of a conventional steel outer shell. is obtained. Further, the outer surface of the silencer body 8 impregnated with resin has the effect of repelling water and oil.

In the above embodiment, the uneven portion 10 extending in the local direction is formed on the inner surface of the muffler main body 8, but the present invention is not limited to this (for example, as shown in FIG. , the uneven portion 21Y may be formed to extend in the longitudinal direction of the muffler main body 8.

If it fits on such an uneven part, the uneven part will be arranged parallel to the flow of exhaust gas and will not obstruct the flow of exhaust gas.
It is possible to prevent a decrease in engine output. Further, as another example of the uneven portion formed on the inner surface of the silencer main body 8, as shown in FIG. 4, a conical projection 31&a may be formed with the apex corner portion shaved. By using such a concavo-convex portion, advantages can be obtained in that it has an excellent sound-absorbing effect and is easy to manufacture.

Another example of the uneven portion formed on the inner surface of the silencer main body 8 is a wedge-shaped protrusion 41 as shown in Figure #1!5.
It is also possible to form a plurality of them. By combining the uneven parts like this, an excellent sound absorbing effect can be obtained.

However, in the above embodiment, the silencer main body 8 has a two-sided structure.
However, the present invention is not limited to this, and the muffler body may be integrally formed with a bottom shape.

In this case, a spiral unevenness s may be formed on the inner surface of the muffler main body 8, and the partition walls 12 and 13 may be screwed and fixed into the recesses of the unevenness.

Further, in the above embodiment, C uses glass core as the material for constructing the silencer body 8, but the material is not limited to this, and organic fibers such as polyester or inorganic fibers such as ceramics may also be used. In short, any non-metallic sound deadening material with excellent heat insulation properties can be used.

As explained above, according to the muffler of this @ Ming, the muffler main body is constituted by a molded body formed by shaping a non-metallic muffler material by compressive force Roe, so that it can be lightweight. It has a simple structure, can be installed at low cost, and has excellent heat insulation properties. Also, as mentioned above, the main body of the silencer is made of sound-deadening material, and there are uneven parts on the inner surface of the silencer. Since the shape is left open and the internal surface area is the top, a higher sound absorption effect can be obtained. In other words, since this high sound absorbing effect can be obtained, when trying to absorb sound to the same level as a conventional one, the entire silencer can be made smaller than the conventional one, and it can be placed inside the silencer itself. By omitting the partition wall, the number of partitions can be reduced, which has the effect of increasing the output of the engine and improving the durability of the muffler itself.

[Brief explanation of the drawing]

No.! FIG. 2 is a cross-sectional perspective view of the silencer, and FIGS. 3 to 5 are perspective views of the mounting portion showing other examples of the silencer. It is. 2... Engine, 3... Exhaust system, 4... Exhaust pipe, 6... Silencer, 7... Exhaust gas passage/path, 8... Silencer body, 9... Silencer Main body structure, 1
40.5! il...°medial convex part, 81.41...
·protrusion. Applicant: Fuda Giken Kogyo Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] This is a muffler installed in an exhaust system of an internal combustion engine, and the muffler main body with an exhaust gas passage %: vM is formed by a scale molded body made by shaping a non-metallic muffler material by aEm processing, and the muffler main body is A silencer for an internal combustion engine characterized by having an uneven portion formed on the inner surface.