JPS591044Y2 - Silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a muffler incorporated in an exhaust system of an automobile engine.

Generally, the muffler 1 includes a cavity 5 in which both ends of a cylindrical can body 2 are closed by end plates 3 and 4, and an inlet exhaust pipe 6 and an outlet exhaust pipe connected to the end plates 3 and 4. 7, and the exhaust gas flowing from the inlet side exhaust conduit 6 is introduced into the cavity 5.

The introduced exhaust gas is muted by contraction, expansion, resonance, or interference effects by a silencing means such as a partition plate 8 provided inside the exhaust gas. It is greatly affected by the size of the internal volume.

Furthermore, the installation position of the muffler 1 in the muffler system after it is manufactured is also an important issue that affects the muffler effect.

Therefore, conventionally, when forming this silencing system, it is often manufactured through trial and error.

However, this method is inefficient and requires a lot of time to manufacture.

Therefore, the present invention is designed to solve the problem when the silencing performance is somewhat insufficient due to insufficient volume of the cavity due to inappropriate installation position of the silencer after forming the silencing system or manufacturing error.
The purpose of this modification is to provide a muffler that can easily correct this problem by expanding the internal volume of either or both of the parts of the inlet-side exhaust pipe or the outlet-side exhaust pipe that communicate with the cavity. This is done by doing this.

This makes use of the area around the exhaust pipe on the inlet or outlet side, which is a useless part on the space actor.
This modification is made without unnecessarily increasing the size of the muffler itself.

Hereinafter, the silencer according to the present invention will be explained with reference to the drawings.

FIG. 2 is a longitudinal sectional view showing an embodiment of the same muffler, and the same members as in FIG. 1 are given the same reference numerals.

This muffler 10 has a cavity 5 in which the front and rear opening ends of a cylindrical can body 2 are respectively closed by end plates 3 and 4, and inside this cavity 5 is a partition plate 8 having a small hole 11 or A muffling means consisting of a conduit 12 etc. fitted to the partition plate 8 is provided.

An inlet side exhaust pipe 6 and an outlet side exhaust pipe 7 are connected to both end plates 3 and 4 of this cavity 5.
, 7 are connected to porous conduits 13 and 14 that protrude inward from the cavity 5 and whose tips are supported by the partition plate 8.

In particular, according to the present invention, the end plate 3 of the inlet exhaust conduit 6
The connecting end side is a large diameter portion 6a over a predetermined length, and the porous conduit 13 extends within this large diameter portion 6a, and the porous conduit 13 is inserted into a space 15 created between the large diameter portion 6a and the large diameter portion 6a. Exhaust gas is injected from the small holes 16.

That is, a relatively large diameter through hole is formed in the end plate 3, the inner peripheral edge of the twenty through holes is bent outward, and the end of the large diameter portion 6a is welded to this bent piece 17.

On the other hand, the porous conduit 13 extends within the large diameter portion 6a and is fitted into the normal diameter portion of the inlet side exhaust conduit 6.

The space 15 formed in this way somewhat increases the internal volume of the cavity 5, and furthermore, since the exhaust gas is contracted, expanded, etc. in this space 15, the sound reduction of the entire muffler is improved. Performance will improve.

Therefore, for example, if the internal volume of the cavity 5 is insufficient due to a wrong installation position of the silencer in the exhaust system or a manufacturing error, it can be easily solved by forming the space 15 as described above. This defect can be corrected.

When forming the large-diameter portion 6a, the inlet-side exhaust conduit may be expanded, but in terms of work efficiency, it is better to form the large-diameter tube by reducing its diameter.

In this way, if the space 15 is formed only on the inlet side exhaust conduit 6 and the capacity is still insufficient, it may also be formed on the outlet side exhaust conduit 7.

Furthermore, if it is impossible for some reason to form the cavity on the inlet side exhaust conduit 6 side, it goes without saying that it may be formed only on the outlet side exhaust conduit side.

Next, the effect will be explained.

Exhaust gas flowing from the inlet side exhaust pipe 6 is normally injected into the cavity 5 through the small hole 16 of the perforated pipe 13 inside the end plate 3, and the small hole 16 undergoes contraction-expansion, Alternatively, the sound should be muffled by contraction-expansion due to the small holes formed in the partition plate 8, resonance caused by the resonance chamber 18 formed around the porous conduit 14 on the outlet side, etc.

However, if the capacity of the muffler 10 is insufficient, the connecting portion on the end plate side of the inlet side exhaust conduit 6 is formed to have a large diameter portion.

By forming this large diameter portion 6a, the porous conduit 13 on the inlet side
In this case, the area where exhaust gas is injected increases, the area where the flow contracts and expands, that is, the area where the sound is muffled increases, and the muffling performance improves.

Further, if this large diameter portion 6a is formed in the outlet side exhaust conduit 7, the volume of the resonance chamber 18 will be increased, and the removal of low frequency components in the noise will be more effective.

By forming a large diameter portion in the exhaust conduit 6 or 7 on the inlet or outlet side in this way, an exhaust system having the desired noise reduction ability can be obtained without reassembling the entire exhaust system or rebuilding the muffler itself. Moreover, since the large-diameter portion is formed using a so-called dead space, the device does not become larger.

As is clear from the above explanation, according to the present invention, a large diameter portion is formed over a predetermined length on the connecting end side of either the inlet side exhaust pipe or the outlet side exhaust pipe with the respective end plates of either the lid or both. By communicating this large-diameter portion with the cavity, the internal volume of the cavity is somewhat increased, thereby improving the silencing performance, making it extremely easy to achieve the desired silencing performance. Moreover, in this case, there is no disadvantage in terms of space such as increasing the size of the noise reduction system.
This results in extremely excellent effects both economically and in terms of work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional muffler, and FIG. 2 is a longitudinal sectional view showing an embodiment of the muffler according to the present invention. 2... Cylindrical can body, 3, 4... End plate, 5... Cavity part, 6... Inlet side exhaust pipe, 7... Outlet side exhaust pipe, 10... Silencer Container, 13.14... Porous conduit, 1
5...Space, 16...Small hole.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A hollow portion whose both ends of the cylindrical can body are closed by end plates;
A sound muffling device in which an artificial side exhaust pipe and an outlet side exhaust pipe connected to the end plate are connected to each other, and the exhaust gas flowing from the inlet side exhaust pipe is muffled in the cavity and flows down from the outlet side exhaust pipe. In the exhaust pipe, either one or both of the connecting portion of the inlet side exhaust conduit to the end plate or the outlet side exhaust conduit to the end plate is configured to have a larger diameter than the other parts, and the exhaust conduit is The large diameter part and the cavity are communicated so as to expand the internal volume of the cavity, and a perforated conduit is extended inside the large diameter part of the exhaust conduit, and the perforated conduit is inserted into the exhaust conduit. , and the exhaust conduit and the enlarged cavity communicate with each other through a large number of small holes of the porous conduit. 2. Each of the exhaust pipes on the inlet side or the outlet side has a reduced diameter except for the portion communicating with the cavity.
Silencer as described in section. 3. The muffler according to claim 1, wherein each of the exhaust pipes on the inlet side or the outlet side is formed by expanding a portion communicating with the cavity.