JPS6139053Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resonant silencer that is installed, for example, in the intake pipe of an automobile engine.

In a resonance chamber formed by a resonance chamber external cylinder coaxially inserted into an intake pipe of an automobile engine, the intake pipe is separated midway so as to face each other, and a gap is created to allow communication between the inside of the intake pipe and the resonance chamber. It is widely known that a resonant muffler is constructed, and the resonant frequency r of such a resonant muffler is determined by the volume V of the resonance chamber, the lateral area of the gap provided in the middle of the intake pipe (in this case, , the outer circumference of the intake pipe x the gap width) S, and the thickness t of the intake pipe wall. That is, the resonance frequency r [Hz] is expressed as follows.

(However, C is the code indicating the speed of sound, 340m/sec
at 15℃. ) However, in the above formula [A], the thickness t of the intake pipe wall of the resonance type muffler is considerably smaller than the volume V of the resonance chamber and the lateral area S of the gap, and the resonant frequency of the formula [A] Since the influence on r is negligible, the resonance frequency r is ultimately determined approximately by the ratio of the lateral area S of the gap and the volume V of the resonance chamber.

Therefore, in order to muffle noise at low frequencies, the resonance frequency must be lowered by making the lateral area S of the gap as small as possible and the volume V of the resonance chamber as large as possible, which determines the diameter of the intake pipe. Since the maximum installation volume of a resonant silencer is almost determined, the resonant frequency r
The problem was that it was not easy to lower the value.

The present invention solves the above problems by forming flanges around the opposing openings of a pair of gas pipes in the resonance chamber, so that the lateral area of the gap and the height of the flanges are the main factor. The purpose is to design a resonant frequency to facilitate setting of the resonant frequency and to obtain a sufficiently low resonant frequency.

An embodiment of the present invention will be described below.

In FIGS. 1 and 2, reference numeral 1 denotes a resonance type muffler according to the present invention, and the resonance type muffler 1 is roughly composed of a resonance chamber outer cylinder 2 and an intake pipe 3 which is a gas pipe.

The resonance type outer cylinder 2 forms a resonance chamber 2a, and seals a portion of the intake pipe 3 inserted into the resonance chamber outer cylinder 2.

One end of the intake pipe 3 is connected to a component of the intake pipe system, such as an engine intake manifold or an air cleaner, so that intake air is guided. The intake pipe 3 includes a pair of intake pipes 3a and 3b.
The pair of intake pipes 3a, 3b
is the opening 3 through the gap 4 in the resonance chamber 2a.
c and 3d are facing each other. In this embodiment, an intake pipe will be described, but an exhaust pipe may also be used. Furthermore, flange portions 3e and 3f, which are a feature of the present invention, are formed on the periphery of each opening portion 3c and 3d.
This makes it possible to equivalently increase the thickness t of the wall of the intake pipe 3. That is, the formula [A] expressing the resonance frequency r described above (However, C is the code indicating the speed of sound, 340m/sec
at 15℃. ) depends on the height h of the flange part. It will be expressed as

Therefore, in the resonance type silencer 1 having the above configuration, the resonance frequency r is mainly designed based on the lateral area of the gap (the outer circumference of the flange x the width of the gap between the flanges) S and the height h of the flange. As a result, a sufficiently low resonant frequency can be easily obtained, making it possible to muffle sound in a low frequency range.

Next, other embodiments shown in FIG. 3, FIG. 4, FIG. 5, and FIG. 6 will be described, but the same components as those in the previous embodiments will be given the same reference numerals and their explanation will be omitted. .

The embodiment shown in FIG. 3 has flange parts 3e and 3f.
is an elliptical plate.

Fig. 4 shows a flange portion 3 having a shape as shown in the figure.
This is an embodiment in which the resonance chamber outer tube 2 is installed eccentrically with respect to the intake pipes 3a and 3b to which the tubes 3e and 3f are attached.

The embodiment shown in FIG. 5 has flange parts 3e and 3f.
The flange portions 3e and 3f are attached at an acute angle to the intake pipes 3a and 3b, and the attachment angles of the flange portions 3e and 3f may be arbitrary.

FIG. 6 shows the intake pipes 3a, 3b and the flange portion 3.
In this embodiment, parts e and 3f are integrally molded from resin, rubber, etc., and as shown in the figure, continuous curved surfaces are formed from the flanges 3e and 3f to the intake pipes 3a and 3b, making it easy to mold them.

Incidentally, FIG. 7 shows the effect of the embodiment of the present invention.

As is clear from the above description, the present invention has the following functions and effects.

In the resonance chamber, flanges are formed on the peripheries of the opposing openings of the gas piping, so the lateral area of the gap (outer circumference of the flange x gap width between the flanges) Mainly, the resonance frequency can be designed, and it becomes easy to set the resonance frequency, and it is also possible to set a low resonance frequency that cannot be obtained with conventional resonance type mufflers.

Since the configuration is such that flanges are simply formed on the peripheries of opposing openings of the gas piping, it can be manufactured easily.

By forming flanges on the peripheries of the opposing openings of the gas piping, the resonance frequency can be set low, so the volume of the resonance chamber can be reduced accordingly.
The resonance type muffler according to the present invention can be downsized.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
4, 5 and 6 respectively show other embodiments, and FIGS. 3 and 4 are side sectional views,
5 and 6 are front sectional views, and FIG. 7 is a graph showing the effects of the embodiment of the present invention. 1... Resonance type muffler, 2... Resonance chamber outer cylinder, 2a
... Resonance chamber, 3, 3a, 3b ... Intake pipe, 3c,
3d...Opening, 3e, 3f...Flange, 4
……gap.

Claims (1)

[Claims for Utility Model Registration] A resonance chamber outer tube forming a resonance chamber; and a resonance chamber outer tube that is inserted into the resonance chamber outer tube in a sealed state, and has openings facing each other with a gap in the resonance chamber, and a peripheral edge of the opening. A resonant silencer characterized by comprising: a pair of gas pipes each having a flange portion formed therein;