JP2533037Y2 - Silencer - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a muffler for an automobile, and more particularly to a muffler capable of facilitating tuning of an attenuation frequency characteristic.

[Conventional technology]

Conventionally, as a car silencer, for example,
Japanese Patent Application Publication No. 106517 and Japanese Utility Model Application Publication No. 64-36609 are known.

FIG. 8 shows this type of silencer. In the figure, reference numeral 11 indicates a silencer main body which is sealed by end plates 13 and 15.

The interior of the silencer main body 11 is divided into three parts by partition plates 17 and 19, and a first expansion chamber 21, a second expansion chamber 22, and a resonator chamber 23 are provided.
Are formed.

An inlet pipe 25 is opened to the first expansion chamber 21 through the end plate 13 and the partition plates 17 and 19.

A return pipe 27 is provided through the partition plate 17, and a resonator pipe 29 is provided through the partition plate 19.

Further, an outlet pipe 31 is arranged so as to penetrate the partition plates 17, 19 and the end plate 15.

In the silencer configured as described above, the exhaust gas introduced into the silencer main body 11 from the inlet pipe 25 has a silencing effect mainly due to expansion in the first expansion chamber 21 and the second expansion chamber 22, respectively. The resonance chamber 23 receives a sound-reducing effect due to resonance.

[Problems to be solved by the invention]

However, such a conventional silencer has a problem that, for example, when the length of the exhaust pipe cannot be sufficiently long due to the structure of the automobile, tuning of the attenuation frequency characteristic becomes difficult.

That is, in general, in the exhaust system, the optimal length from the engine to the muffler, strictly, up to the outlet end 33 of the inlet pipe 25 of the muffler is determined according to the damping frequency characteristic. In addition, when the length of the exhaust pipe cannot be sufficiently long, the optimum length cannot be secured, and there is a problem that tuning of the attenuation frequency characteristic becomes difficult.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a muffler that can easily and reliably tune the attenuation frequency characteristic.

[Means for solving the problem]

A muffler according to the present invention is a muffler having an inlet pipe and an outlet pipe opened in a muffler body,
The inlet pipe is divided into a plurality by a partition member extending in the axial direction of the inlet pipe, and a plurality of gas passages are formed. The gas passage excluding the gas passage is sealed with a blind plug, while the gas passage excluding the gas passage serving as an exhaust gas outlet among the gas passages opened on the outlet side of the inlet pipe is sealed with a blind plug, and By forming a plurality of communication holes in the partition member near each blind plug farthest from the gas inflow side, an exhaust gas inlet is located at one end of the plurality of gas passages and an exhaust gas outlet is located at the other end. In such a way as to communicate in series.

[Action]

In the silencer of the present invention, a plurality of gas passages are formed in the inlet pipe, and the plurality of gas passages are arranged in series such that the exhaust gas inlet is located at one end and the exhaust gas outlet is located at the other end. Because of the communication, the substantial length of the inlet pipe is the sum of the lengths of the gas passages.

〔Example〕

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

FIG. 1 shows details of the inlet pipe of FIG. 2, and FIG. 2 shows an embodiment of the muffler of the present invention.

In FIG. 2, reference numeral 41 denotes a silencer main body which is sealed by end plates 43 and 45.

The interior of the muffler main body 41 is divided into three by partition plates 47 and 49, and a first expansion chamber 51, a second expansion chamber 52, and a resonator chamber 53 are formed.

An inlet pipe 55 is opened to the first expansion chamber 51 through the end plate 43 and the partition plates 47 and 49.

A return pipe 57 is provided through the partition plate 47, and a resonator pipe 59 is provided through the partition plate 49.

Further, an outlet pipe 61 is arranged to penetrate the partition plates 47, 49 and the end plate 45.

In this embodiment, as shown in FIGS. 1 and 3, the inlet pipe 55 is divided into three parts by three partition members 63 extending in the axial direction of the inlet pipe 55. Thereby, three gas passages 65, 66, 67 are formed.

In this embodiment, as shown in FIG. 3, the three partition members 63 are formed in a fan-shaped cylindrical shape having a central angle of 120 °.

As shown in FIG. 4, the gas passages 66, 67 excluding the gas passage 65 serving as an exhaust gas inflow port among the gas passages 65, 66, 67 opening on the inlet side of the inlet pipe 55 are formed by blind plugs 69. Sealed.

As shown in FIG. 5, among the gas passages 65, 66, 67 which are open on the outlet side of the inlet pipe 55, the gas passages 65, 66 excluding the gas passage 67 serving as the exhaust gas outlet are formed by blind plugs 71. Sealed.

Further, in the partition member 63, as shown in FIG. 6, communication holes 73 and 75 are formed farthest from the respective gas inflow sides. That is, in the communication hole 73, the inlet of the gas passage 65, that is, the position farthest from the gas inlet, is located,
The communication hole 75 is located at the entrance of the gas passage 66, that is, at the position farthest from the communication hole 73. This allows
Three gas passages 65, 66, 67 are provided at one end with an exhaust gas inlet 77.
However, they are connected in series such that the exhaust gas outlet 79 is located at the other end.

In the silencer configured as described above, the exhaust gas introduced into the silencer main body 41 from the inlet pipe 55 has a silencing effect mainly due to expansion in the first expansion chamber 51 and the second expansion chamber 52, respectively. Then, the resonance chamber 53 receives a sound-reducing effect due to resonance.

Thus, in the silencer configured as described above, the inlet pipe 55 is divided into three by the partition member 63 extending in the axial direction of the inlet pipe 55, and the three gas passages 65, 66, 67
And the gas passages 66, 67 excluding the gas passage 65 serving as the exhaust gas inlet 77 out of the gas passages 65, 66, 67 opened on the inlet side of the inlet pipe 55, are sealed by blind plugs 69. , Gas passages 65, 66, 67 opening to the outlet side of the inlet pipe 55
The gas passages 65 and 66 except for the gas passage 67 serving as the exhaust gas outlet 79 are sealed with blind plugs 71, and further, partition members 63 near the respective blind plugs 65 and 71 farthest from the gas inflow side.
By forming a plurality of communication holes 73, 75, three gas passages 65, 66, 67 are connected in series such that an exhaust gas inlet 77 is located at one end and an exhaust gas outlet 79 is located at the other end. Because of the communication, the substantial length of the inlet pipe 55 is reduced by three gas passages 6.
Since the length is obtained by adding 5, 66, and 67, tuning of the attenuation frequency characteristic can be performed easily and reliably.

That is, in the silencer configured as described above, for example, even when the exhaust pipe cannot be long enough in design, the exhaust pipe can be exhausted by taking a substantial length of the inlet pipe 55 sufficiently. It is possible to compensate for the length of the tube, and it is possible to easily and reliably tune the attenuation frequency characteristic.

FIG. 7 shows an inlet pipe of another embodiment of the muffler of the present invention. In this embodiment, the inlet pipe 81 is divided into four parts by a cross-shaped partition member 83, and four gas passages 8 are provided.
5,86,87,88 are formed.

Then, one gas passage 86 is filled with a sound absorbing material 91 such as glass wool, and a partition member 83 between the gas passages 85 and 86 is provided.
Has a large number of through holes 93 formed therein.

In the silencer configured as described above, substantially the same effects as in the embodiment shown in FIG. 2 can be obtained. However, in this embodiment, since the single gas passage 86 is filled with the sound absorbing material 91, In addition, the exhaust gas flows from the through hole 93 to the sound absorbing material 86 side, so that the noise reduction efficiency can be further improved.

[Effect of the invention]

As described above, in the silencer of the present invention, the inlet pipe is divided into a plurality by the partition member extending in the axial direction of the inlet pipe, and a plurality of gas passages are formed.
Out of the gas passages opening on the inlet side of the inlet pipe, the gas passages except for the gas passage serving as the exhaust gas inlet are sealed with blind plugs, while the exhaust gas outlet on the gas passage opening on the outlet side of the inlet pipe. The gas passages except for the gas passages to be closed are sealed with blind plugs, and further, by forming a plurality of communication holes in a partition member near each blind plug farthest from the gas inflow side, a plurality of gas passages are formed at one end. Since the exhaust gas inlet is connected in series so that the exhaust gas outlet is located at the other end, the substantial length of the inlet pipe is a length obtained by adding a plurality of gas passages. There is an advantage that the tuning of can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing details of an inlet pipe shown in FIG. FIG. 2 is a longitudinal sectional view showing one embodiment of the silencer of the present invention. FIG. 3 is a cross-sectional view of the inlet pipe of FIG. FIG. 4 is a front view of the inlet pipe of FIG. 2 on the exhaust gas inlet side. FIG. 5 is a front view of the inlet pipe of FIG. 2 on the exhaust gas outlet side. FIG. 6 is an explanatory diagram showing the flow of exhaust gas from the inlet pipe of FIG. FIG. 7 is a longitudinal sectional view showing an inlet pipe of another embodiment of the muffler of the present invention. FIG. 8 is a longitudinal sectional view showing a conventional silencer. [Explanation of Signs of Main Parts] 41: Silencer body 55 ... Inlet pipe 63 ... Partition member 65, 66, 67 ... Gas passage 69, 71 ... Blind plug 73, 75 ... Communication hole 77 ... … Exhaust gas inlet 79 …… Exhaust gas outlet.

Claims (1)

(57) [Scope of request for utility model registration] 1. A muffler having an inlet pipe and an outlet pipe opened in a muffler main body, wherein the inlet pipe is divided into a plurality of parts by a partition member extending in an axial direction of the inlet pipe. While forming a gas passage of
Out of the gas passages opening on the inlet side of the inlet pipe, the gas passages except for the gas passage serving as the exhaust gas inlet are sealed with blind plugs, while the exhaust gas outlet on the gas passage opening on the outlet side of the inlet pipe. By closing the gas passages except for the gas passages to be closed with blind plugs, and further forming a plurality of communication holes in the partition member near each blind plug farthest from the gas inflow side, the plurality of gas passages are formed. A muffler characterized in that the muffler is connected in series such that the exhaust gas inlet is located at one end and the exhaust gas inlet is located at the other end.