JPH0610141Y2 - Scarf - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a muffler, and more particularly to a muffler having improved rigidity of a muffler body.

[Conventional technology]

A muffler is generally used as a means for reducing noise when the exhaust gas of an internal combustion engine is released into the atmosphere.

Conventionally, this type of muffler is composed of a muffler body 1, an exhaust gas inlet pipe 3, an exhaust gas outlet pipe 4 and separators 2 and 2, as shown in FIG. Muffler body 1
Is formed in a tubular shape whose both ends are closed by an end plate 6 forming one end wall and an end plate 7 forming the other end wall, and two separators 2, 2 are arranged in the muffler body 1. Thus, the inside of the muffler body 1 is divided into three expansion chambers. Further, the exhaust gas inlet pipe 3 penetrates the end plate 6 and the two separators 2 and 2 in an airtight manner and opens into the first expansion chamber 12, and the exhaust gas outlet pipe 4 is connected to the end plate 7 And the two separators 2 and 2 are hermetically penetrated to open in the third expansion chamber 15. Two
Communication passages 8 and 8 are provided in the sheet separators 2 and 2, respectively. The exhaust gas outlet pipe 4 is provided with a drainage pipe 5 having a diameter smaller than that of the outlet pipe 4.

The conventional muffler is configured as described above, and the combustion gas discharged from the internal combustion engine reaches the exhaust gas inlet pipe 3 through the appropriate passages and devices, and from the inlet pipe 3 to the first expansion chamber 12 Then, the first expansion is performed in the expansion chamber 12. Next, the decompressed combustion gas enters the second expansion chamber 14 through the communication passage 8 and is expanded again to be decompressed. The decompressed combustion gas further passes through the communication passage 8 and the third expansion chamber 15
It enters and expands, and finally is discharged into the atmosphere through the exhaust gas outlet pipe 4.

[Problems to be solved by the invention]

In the conventional muffler as described above, the high pressure exhaust gas discharged from the exhaust gas inlet pipe 3 into the first expansion chamber 12 causes the end plate 7 to vibrate as shown by a chain line in FIG. However, there is a problem that the expansion chamber 12 becomes a resonance chamber and noise is generated.

In order to prevent the vibration of the end plate 7, conventionally, bead reinforcement (not shown) is provided on the end plate 7, but the end plate 7 has a plate thickness of at most.
Since it is about 1.2 to 1.6 mm, flat reinforcement such as providing beads on a flat plate is not sufficient.

Further, in order to prevent the noise caused by the vibration of the end plate 7 from being an unpleasant sound, the mass damper 13 is welded to the end plate 7 as shown in FIG. 3 in order to change the frequency characteristic of the noise. ing.

However, such addition of the mass damper 13 leads to an increase in the material and manufacturing process therefor and is not necessarily an effective measure.

The present invention is intended to solve such a problem, and by improving the shape of the end plate itself, deformation and vibration due to exhaust gas are prevented, and at the same time, the drainage effect is improved. The purpose is to provide a muffler that can be covered.

[Means for solving problems]

In order to achieve the above-mentioned object, the muffler of the present invention includes an exhaust gas inlet pipe that airtightly penetrates one end wall of the muffler body and opens inside the muffler body, and an other end wall of the muffler body airtightly. The exhaust gas outlet pipe that opens into the muffler body is provided, and a conical hammered portion is formed at the other end wall of the muffler body, the conical portion having the penetrating portion of the exhaust gas outlet pipe as the top. .

[Action]

In the above-described muffler of the present invention, the pyramidal punched portion having the apex portion of the exhaust gas outlet pipe of the muffler body as a top acts as a support portion of the exhaust gas outlet pipe, and the shape enhances the rigidity of the muffler body. In addition, depending on the mounting arrangement of the muffler, the conical-shaped projecting portion also functions as a water pool portion.

〔Example〕

Next, an embodiment of the present invention will be described. FIGS. 1 and 2 show a muffler as one embodiment of the present invention.
The figure is an enlarged vertical cross-sectional view showing the vicinity of the exhaust gas outlet pipe,
FIG. 2 is a partial cross-sectional view showing the water pool function when it is mounted in the front ascending manner.

The muffler as one embodiment of the present invention has the same basic structure as that of the conventional muffler of FIG. 3, and therefore only different points will be described below. As shown in FIG. 1, the end plate 7 forming the end wall of the muffler body 1 on the side of the first expansion chamber 12 is different from the conventional one in the shape of a cone with the penetrating portion of the exhaust gas outlet pipe 4 as the top. The embossed portion 9 is formed. As shown in FIG. 1, the cone-shaped embossed portion 9 is provided on the muffler body 1 of the end plate 7.
It has a structure in which the exhaust gas outlet pipe 4 is supported by a top portion 9'protruding in a conical shape from a mounting portion thereof. The first
The alternate long and short dash line in the figure indicates the conventional end plate attachment position. In addition, as shown in FIGS. 1 and 4,
Although the outlet pipe 11 which is a separate body is connected to the inside of the muffler of the exhaust gas outlet pipe 4, the exhaust gas outlet pipe 4 is functionally not directly attached to the muffler.

Since the muffler as one embodiment of the present invention is configured in this way, the rigidity of the end plate 7 as the end wall of the muffler body 1 is significantly improved, and the expansion chamber does not vibrate resonantly and emits noise. . Also, the end plate 7
Since the above process can be performed only by the press process, it does not particularly require man-hours as compared with the conventional end plate 7.

FIG. 2 shows a case in which a muffler as an embodiment of the present invention is mounted and arranged on the vehicle body so as to move forward, and the cone-shaped projecting portion 9 is located below the muffler, and exhaust gas is exhausted. It functions as a water pool that collects water droplets due to the condensation of water in the gas.

Therefore, in this case, if the slit or hole 10 provided in the outlet pipe is provided close to the outlet side of the muffler, this slit or hole 10 acts as a drain hole.

[Effect of device]

As described in detail above, according to the muffler of the present invention, since the end plate that constitutes the end wall is provided with the punching portion having the outlet pipe attachment portion as the apex, the rigidity of the entire end plate is improved, As a result of the end plate not deforming or vibrating due to the resonance vibration in the expansion chamber, not only the effect of eliminating the generation of unpleasant noise can be obtained,
The slits or holes in the exhaust gas outlet pipe can now be provided on the outlet side compared to the conventional ones.Therefore, depending on the muffler arrangement, the conical projecting part can be used as the water pool part of the muffler to form this slit or hole. Therefore, there is also an advantage that the water removal effect can be further improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show a muffler as one embodiment of the present invention. FIG. 1 is an enlarged vertical sectional view showing the vicinity of an exhaust gas outlet pipe, and FIG. It is a partial cross-sectional view showing the water pool function when it is installed in the front ascending manner, FIGS. 3 and 4 show a conventional muffler, and FIG.
The drawing is an enlarged vertical sectional view showing the vicinity of the outlet pipe. 1 ... Muffler body, 2 ... Separator, 3 ... Exhaust gas inlet pipe, 4 ... Exhaust gas outlet pipe, 5 ... Drainage pipe, 6
...... One end wall (end plate), 7 ...... other end wall (end plate), 8 ...... communication passage, 9 ...... conical ejection part, 9 '
...... Top, 10 ...... Slit, 11 ...... Outlet pipe, 12 ...... First expansion chamber, 13 ...... Mass damper,
14 ... second expansion chamber, 15 ... third expansion chamber.

Claims (1)

[Scope of utility model registration request] 1. An exhaust gas inlet pipe that airtightly penetrates one end wall of a muffler body and opens into the muffler body, and an exhaust gas that airtightly penetrates the other end wall of the muffler body and opens into the muffler body. A muffler having an outlet pipe, wherein a conical projecting portion having a penetrating portion of the exhaust gas outlet pipe as a top is formed on the other end wall of the muffler body.