JPS5836167B2 - Silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a muffler for muffling the exhaust noise of an internal combustion engine such as an automobile engine, and more particularly to a muffler whose interior is partitioned into two six rooms.

As illustrated in FIG. 1, the conventional silencer of this type is of a winding barrel type, and therefore has the following various disadvantages.

That is, there are many component parts, and maintenance management is complicated.

During assembly, the can body 1 and the left and right end plates 2 and 3 are wound and fastened together, and the can body 1 is bolted or spot welded to the porous partition plate 6 that partitions the inside of the container into two chambers 4 and 5. This method requires a total of 6 joining operations, as well as an operation for inserting and supporting the exhaust inflow pipe 7 and outflow pipe 8 into the vessel body, and furthermore, the above operations have to be performed in a complicated process order.

The objective of the present invention is to provide a muffler that does not have these disadvantages.

The present invention has a silencer constructed in the shape of a confectionery, all the structural parts can be pressed or molded, the assembly work is easy, and the function and effect of the conventional roll cylinder type silencer is improved by using fewer components. A silencer that is equivalent to the above was obtained.

The present invention will be described below with reference to embodiments shown in FIGS. 2 to 6.

This embodiment is equivalent to the silencer shown in FIG. 1, and is constructed by superimposing an upper case 9, an upper partition plate 10, a lower partition plate 10a, and a lower case 9a in this order.

First, the above-mentioned components will be explained.

Each case and partition plate are made by press molding a copper plate.

The upper case 9 and the lower case 9a have vertically symmetrical shapes,
Each has a bulging central part and a semi-cylindrical artificial IL on the left end.
11a, a semi-cylindrical outlet 12, 128 is provided at the right end, and flanges 13, 132 are provided around the periphery.

The upper partition plate 10 and the lower partition plate 10a are vertically symmetrical except for the shapes of the inner ends of the inflow pipe portion and the outflow pipe portion (both will be described later).

That is, both the partition plates 10 and 108 each consist of a flat base part 14.14a whose outer shape is the same as the flange part of the case, and the entrances 11 and 14a of the upper and lower cases 9 and 9a are connected to the base part 14 and 148 from the left end, respectively. A semi-cylindrical inflow pipe part 15.15a with a constricted inner end fitted inside the casing 112 is bulged out, and the outlet 12, 12a of the upper and lower cases 9, 9a is similarly inserted from the right end.
The semi-cylindrical outflow pipe part 16.16a which is fitted inside and bifurcated inside is bulged out, and the part of the base part 14.14a which overlaps with the flange 13.13a and the inflow pipe part 15
．． 15a and a plurality of small holes 17, 17a are bored in the portion excluding the outflow pipe portion 16.16a.

The inner end 18 of one inlet pipe section 15 is formed into a dead end,
The inner end 18a of the other inflow pipe portion 15a is bent into a shape that fits inside the inner end 18 to form an opening 19.

(Figures 2 and 4). In the case of the outflow pipe section 16.16a, on the contrary, the inner end 20a, 2 of the outflow pipe section 16a
0a is formed into a dead end, and the other inner end 20.20 is bent up to form an opening 2L21 (Fig. 2, Fig. 5).
.

Other than this, in order to form the muffler equivalently to the silencer shown in FIG.
A semi-cylindrical short-circuit pipe part 24.3 is bored between the inflow pipe part 15.15a and the outflow pipe part 16, 16a. 24
A is formed.

These correspond to the short circuit holes 25, 26 and the short circuit pipe 27 in the silencer shown in FIG.

In addition, in the silencer shown in FIG. 1, the actual acoustic length is calculated by taking into account the short-circuit hole and calculating the ratio of 11 between the length a of the inflow pipe γ into the body and the length b of the outflow pipe 8, L: , Lma1
3 or L: 7L combination, short circuit holes 25, 2
When the diameter of each tube 7 and 8 is 40φ, the diameter of 6 is 2ψ×4~6φ
If the equivalent area is set between x2, effective noise reduction is achieved, so in the present invention, the penetration lengths A and B and the hole diameter are also set at the same ratio.

Next, to explain the assembly work, as shown in FIG.
, 153 and the right end of the outflow pipe portions 16, 16a, the upper and lower cases 9, 9a, and the upper and lower partition plates 10, 10.
2 are superimposed to the state shown in FIG. 5, and the overlapping part at the flange 13.13a and the joint part between the inlet pipe 28 and the outlet pipe 29 and the vessel body are seam welded.

In the silencer of the present invention assembled in this way, the upper and lower cases 9 and 9a form a body, and the upper and lower porous partition plates 10 and 108 form two upper and lower chambers 30 and 31. Together, they form an inflow pipe and an outflow pipe that open into separate rooms.

Exhaust gas flowing into the vessel from the inlet pipe 28 flows in the following order and is subjected to various silencing effects by each component.

Most of the exhaust air passes through the inlet pipe portions 15 and 152 to the opening 19.
Enter room 30 below.

A portion extends from the inflow pipe section to the short circuit hole 22 and the short circuit pipe section 24 .
24a directly above the chamber 31 and the outflow pipe section 16,
16a.

Most of the exhaust from the room 30 is through a plurality of small holes 17.17a.
It flows into the upper room 31 through.

A portion flows directly into the outflow pipe section 16.16a through the short-circuit hole 23.

Exhaust from the upper room is through two openings 21. 21 into the outflow pipe section 16, 162, and the outlet pipe section 16.16a.
is discharged through the outlet pipe 29.

Each of the silencing effects is well known, so a description thereof will be omitted.

In addition, small hole 17. When the outer diameter of the base portion 17a is set to 2 to 4 mm, the base portions 14, 142 can also function as a filter for damaged catalyst particles in the upstream catalytic exhaust purification device.

In addition, if the openings 19 of the inflow pipe portions 15, 15a are covered with a heat-resistant continuous pore material or a heat-resistant porous plate, the secondary airflow of the exhaust gas ejected from the openings 19 can be prevented. Generation of noise can be prevented.

As can be seen from the above embodiments, the present invention has the following advantages: 1) The number of components is small and various types of silencing structures can be easily constructed.

2) All of the component parts can be manufactured by press molding from steel plates, making assembly work simple and quick, and costs are low.

3) Due to its simple structure, it can be made lighter and smaller.
It is also possible to save on fuel consumption.

4) A bifurcated pipe can be easily provided within the vessel.

It has great industrial effects.

[Brief explanation of drawings]

Figure 1 is a cross-sectional side view showing an example of a winding barrel type silencer, Figure 2-
Figure 6 shows an embodiment of the present invention equivalent to the silencer shown in Figure 1, Figure 2 is an exploded perspective view, Figure 3 is a plan view with the soil case removed, and Figure 4 is an exploded perspective view. Figure 3 is a cross-sectional view of the state in which the upper case is attached, and Figure 5 is a cross-sectional view of Figure 3, which is the same as Figure 4.
6 is a sectional view taken along the line Z--Z in FIG. 3, similar to FIG. 4. 9: Soil case, 9a: Lower case, 10: Soil partition plate, 10
a: Lower partition plate, 11, IIA: Entrance, 12.12a:
Outlet, 14.14a: base, 15, 15a: inflow pipe section,
16.16a: Outflow pipe section, 17, 17a: Small hole, 18.
18a: inner end, 19: opening, 20, 20a: inner end,
21: opening, 30: room, 31: room.

Claims (1)

[Claims] 1 A soil case 9 having a semi-cylindrical inlet 11 and an outlet 12, a lower case 9a shaped to be vertically symmetrical to the soil case 9, and a flat base 14 with an outer end inside the inlet 11. A semi-cylindrical inflow pipe part 15 to be fitted and a semi-cylindrical outflow pipe part 16 whose outer end is similarly fitted into the outlet 12 are opened at one inner end and the other inner end is closed at a dead end 6. The shaped soil partition plate 10 is vertically symmetrical with the upper partition plate 10, except that the combination of openings and dead ends at the inner ends of the inflow pipe section and the outflow pipe section is reversed to the combination of the soil partition plate 10. The shaped partition plates 10a are separately press-molded, and the above-mentioned cases and partition plates are stacked in the order of upper case 9, upper partition plate 10, lower partition plate 10a, and lower case 9a to form upper and lower parts inside the container. Two rooms 30.31 are separated by a partition plate, and the room 30.31 is formed on the flat plate part of the upper and lower partition plates. A silencer characterized in that a plurality of small holes 17 and 172 are formed respectively to communicate with each other.