JPH08334011A - Noise eliminator for internal combustion engine - Google Patents

Abstract

PURPOSE: To eliminate an exhaust noise by a small and lightweight device by dispersing exhaust air by rapidly expanding it outside into a resonance chamber by centrifugal force while performing rotational guidance by a guiding plate in exhaust passages of respective guide plates. CONSTITUTION: A longitudinal almost central part of an introducing pipe 7 is inserted and installed in an introducing hole 2 of a resonance chamber 6 having a proper length, and an outside end part of a deriving pipe 8 is inserted and installed in a deriving hole 4 of a deriving plate 5 so as to deeply extend in the resonance chamber 6. An exhaust pipe 10 in which exhaust holes 9... are bored over the whole is laid between mutual introducing pipe 7 inside end part in the resonance chamber 6 and almost central part of the deriving pipe 8, and plural guide plates 12 where an exhaust passage 11 is bored on the central part side are arranged at proper intervals in the introducing pipe 7 side end part in this exhaust pipe 10. A guiding plate 13 having a proper shape to guide exhaust air introduced from the introducing pipe 7 into the resonance chamber 6 from the respective exhaust holes 9 of the exhaust pipe 10 while performing rotational guidance, spiral guidance and reflective guidance of a sound wave, is installed in an exhaust passage 11 part of these respective guide plates 12, and centrifugal force can be applied to the exhaust air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for an internal combustion engine, which is suitable for surely eliminating exhaust noise generated from an internal combustion engine of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a silencer for an internal combustion engine of this type, a resonance chamber type has been mainly used, and most of them have been constructed by appropriately combining a return pipe and the like.

Further, a large number of resonance chambers for repeating the return, a large size of the resonance chambers for silencing at volume ratio, and a structure for opening a bypass at a high rotation speed are disclosed. Has been done.

In addition, a sound absorbing type is disclosed in which a sound absorbing material such as glass wool is filled between a cylindrical exhaust pipe having a large number of exhaust holes and a cylindrical resonance chamber to improve exhaust efficiency. ing.

[0005]

However, in the case where the return pipe and the like are appropriately combined, the exhaust pressure inevitably rises, so that the exhaust efficiency and the muffling efficiency of the internal combustion engine are poor, and the exhaust noise of the internal combustion engine is ensured. Could not be erased. Also, a large number of resonance chambers are used to repeat the return, a large resonance chamber is used to muffle sound at a volume ratio, and a system in which the bypass is opened at high rotation speed has a large volume. Because,
There was a problem that the body weight became heavy. In addition, with a sound absorbing material such as glass wool filled between the cylindrical exhaust pipe with a large number of exhaust holes and the cylindrical resonance chamber, the sound absorbing material breaks fine with time and the resonance There was a drawback that it scattered outside the room.

Therefore, the present invention was created in order to solve the above-mentioned problems, and makes it possible to reliably eliminate the exhaust noise of the internal combustion engine by efficiently exhausting and silencing the internal combustion engine. At the same time, the volume is made small so that the weight of the vehicle body can be reduced, and further, the secular change is suppressed as much as possible.
A silencer for an internal combustion engine capable of preventing scattering of a sound absorbing material or the like outside the resonance chamber.

[0007]

In order to achieve the above-mentioned object, the present invention provides a substantially central portion in the longitudinal direction of an introducing pipe for introducing exhaust gas and sound waves into an introducing hole at one end of a resonance chamber having an appropriate length. An outer end portion of a lead-out tube that is inserted and is attached to the other end of the lead-out plate at the other end of the resonance chamber, the outer end portion of the lead-out tube leading out the exhaust gas is longer than the outer end portion side and extends deeply into the resonance chamber. While being inserted and installed, an exhaust pipe having a large number of exhaust holes is installed between the inner end of the introduction pipe and the substantially central portion in the longitudinal direction of the discharge pipe in the resonance chamber. A plurality of guide plates, each having an appropriate shape and having an exhaust passage formed on the center side, are arranged at the pipe-side end at appropriate intervals so that the outer peripheral ends of the guide plates are fixed to the inner peripheral surface of the introduction pipe. In the exhaust passage portion of each guide plate, the exhaust gas introduced from the introduction pipe is guided to rotate and swirl. It is from the exhaust holes of the exhaust pipe while the sound wave is reflected induced ones equipped with induction plate of appropriate shape to induce into the resonance chamber.

[0008]

By the above-mentioned technical means, when used, the exhaust gas introduced straight from the introduction pipe is introduced into the exhaust passage of each guide plate while being guided by rotation by the guide plate. From each exhaust hole on the tube side into the resonance chamber, from where it passed each guide plate while guiding the spiral by the guide plate, it rapidly spreads to the outside by centrifugal force and from each exhaust hole on the exhaust pipe side into the resonance chamber. By being dispersed, the exhaust gas is effectively diffused and canceled in the resonance chamber, so that the exhaust gas having a significantly more stable atmospheric pressure than that of the introduction pipe can be taken out from the outlet pipe deeply extending into the resonance chamber.

At the same time, the high frequency sound wave introduced straight from the introduction pipe together with the exhaust gas strikes the guide plate in the exhaust passage of each guide plate and is reflected and guided to the outside at the same angle as the guide plate. After that, the exhaust holes of the exhaust pipe between the guide plates are moved into the resonance chamber. In addition, it is better to use multiple resonance chambers and repeat the return as in the past, or to make the resonance chamber large to muffle the volume ratio, or to open the bypass at high rotation speed. , Make the volume small.

Further, the secular change such as the sound absorbing material being finely broken over time is suppressed as much as possible.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the silencer for an internal combustion engine according to the present invention includes, first, an introducing plate 3 having an introducing hole 2 at the center at one end of a cylindrical resonance plate 1 having an appropriate length. And a lead-out plate 5 having a lead-out hole 4 in the center thereof is formed at the other end of the resonance plate 1, and a resonance chamber 6 is formed. A substantially central portion in the longitudinal direction of a cylindrical introduction pipe 7 for introducing a sound wave is inserted, and an outer end of a cylindrical lead-out pipe 8 for leading out exhaust gas is introduced into a lead-out hole 4 of a lead-out plate 5 of a resonance chamber 6, The inner end side is longer than the outer end side and is inserted so as to extend deep into the resonance chamber 6.

Further, between the inner end portion of the introduction pipe 7 inside the resonance chamber 6 and the substantially central portion in the longitudinal direction of the lead-out pipe 8, a cylindrical shape such as punching metal having a large number of exhaust holes 9 is formed as a whole. The exhaust pipe 10 of the above is installed, and the exhaust passage 11 is provided at the end portion of the exhaust pipe 10 on the side of the introduction pipe 7 at the central portion side except for the outer peripheral portion.
A plurality of annular guide plates 12 having holes are provided at appropriate intervals so that their outer peripheral ends are fixed to the inner peripheral surface of the introduction pipe 7.

Further, in the exhaust passage 11 portion of each of the guide plates 12, the exhaust gas introduced from the introduction pipe 7 is guided to rotate.
The exhaust pipe 1 while spirally guiding and reflecting and guiding sound waves
One spiral guide plate 13 that guides each of the exhaust holes 9 of 0 to the resonance plate 1 side in the resonance chamber 6, the both ends of the guide plate 12 being closest to the introduction pipe 7 side and the discharge pipe 8 side. It is attached so as to be fixed to the exhaust passage 11.

The exhaust gas introduced straight from the introduction pipe 7 is guided in the exhaust passage 11 of each guide plate 12 in the guide plate 13.
At the inlet pipe 7 side of the exhaust pipe 10 to the resonance plate 1 side in the resonance chamber 6 while being guided by rotation, and from the place where each guide plate 12 is swirled while being guided by the guide plate 13 rapidly. The centrifugal force spreads outward and is dispersed from the exhaust holes 9 on the outlet pipe 8 side of the exhaust pipe 10 to the resonance plate 1 side in the resonance chamber 6 so that the exhaust gas is effectively diffused in the resonance chamber 6 to be offset. It was made to be done.

At the same time, the high frequency sound waves introduced straight from the introduction pipe 7 together with the exhaust gas hit the guide plate 13 in the exhaust passage 11 of each guide plate 12, and the guide plate 13 and the like. After being guided outward at an angle, each guide plate 1
The exhaust holes 10 of the exhaust pipe 10 between the two are advanced to the resonance plate 1 side in the resonance chamber 6.

[0017]

As described above, in the silencer for an internal combustion engine of the present invention, a substantially central portion in the longitudinal direction of the introduction pipe 7 for introducing exhaust gas and sound waves is inserted into the introduction hole 2 at one end of the resonance chamber 6 having an appropriate length. Inside the resonance chamber 6, an outer end portion of a lead-out pipe 8 for leading out exhaust gas is provided in the lead-out hole 4 of the lead-out plate 5 at the other end of the resonance chamber 6 such that the inner end portion side is longer than the outer end portion side. And the exhaust hole 9 between the inner end of the introduction pipe 7 and the substantially central portion of the discharge pipe 8 in the longitudinal direction in the resonance chamber 6 as a whole.
The exhaust pipe 10 in which a large number of
A plurality of guide plates 12 each having an appropriate shape and having an exhaust passage 11 formed in the center thereof are fixed to the inner pipe 7 at the ends thereof. Are arranged at appropriate intervals so that the exhaust passage 11 of each guide plate 12 has
A guide plate 13 having an appropriate shape for guiding the exhaust gas introduced from the introduction pipe 7 into each of the resonance chambers 6 through the exhaust holes 9 of the exhaust pipe 10 while rotating and guiding the exhaust gas and reflecting the sound waves is mounted. With this configuration, when in use, the exhaust gas introduced straight from the introduction pipe 7 is guided in the exhaust passage 11 of each guide plate 12 while being guided by the guide plate 13 so as to rotate and guide the exhaust pipe 10 to the introduction pipe 7 side. From each exhaust hole 9 to the inside of the resonance chamber 6, while being guided by the guide plate 13, the exhaust gas rapidly spreads outward from the place where each guide plate 12 is passed by centrifugal force to the exhaust pipe 10 side exhaust pipe 8. 9 is dispersed in the resonance chamber 6 and the exhaust gas is effectively diffused and canceled in the resonance chamber 6, so that the exhaust pipe 8 deeply extending into the resonance chamber 6 is more deeply discharged than the introduction pipe 7. Since it is possible to take out the exhaust gas with a remarkably stable atmospheric pressure, The exhaust of the combustion engine can be carried out efficiently.

At the same time, the high frequency sound wave introduced straight from the introduction pipe 7 together with the exhaust gas strikes the guide plate 13 in the exhaust passage 11 of each guide plate 12, and the guide plate 13 is guided.
After being reflected and guided to the outside at an equal angle with, each of the exhaust holes of the exhaust pipe 10 between the guide plates 12 advances to the inside of the resonance chamber 6, so that the internal combustion engine can be effectively silenced. Together, the exhaust noise of the internal combustion engine can be reliably eliminated.

Further, the silencer for an internal combustion engine according to the present invention includes a lead-in pipe 7 inserted into one end of one resonance chamber 6 and a lead-out pipe 8 inserted into the other end of the resonance chamber 6. An exhaust pipe 10 is installed between them, and a plurality of guide plates 12 are arranged at appropriate intervals at the end of the exhaust pipe 10 on the side of the introduction pipe 7, and a guide plate 13 is mounted in each of the guide plates 12. Due to the simple structure, a large number of resonance chambers are used to repeat the return as in the past, a large resonance chamber is used to muffle the volume ratio, and a bypass can be used at high revolutions. Since the volume of the vehicle body can be made smaller than that of the opened one, the weight of the vehicle body can be reduced.

Further, in the muffler for an internal combustion engine of the present invention, a space between the exhaust pipe 10 and the resonance chamber 6 is not filled with a sound absorbing material such as glass wool as in the conventional case, so that time elapses. Accordingly, it is possible to suppress the secular change such as the sound absorbing material being finely broken, and to prevent the sound absorbing material and the like from scattering outside the resonance chamber 6.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resonance plate 2 Introduction hole 3 Introduction plate 4 Derivation hole 5 Derivation plate 6 Resonance chamber 7 Introduction pipe 8 Derivation pipe 9 Exhaust hole 10 Exhaust pipe 11 Exhaust passage 12 Guide plate 13 Induction plate

Claims (1)

[Claims] 1. An approximately central portion in the longitudinal direction of an introduction pipe for introducing exhaust gas and a sound wave is inserted into an introduction hole at one end of a resonance chamber of an appropriate length,
In addition, an outer end portion of a lead-out tube for leading out exhaust gas is inserted into a lead-out hole of the lead-out plate at the other end of the resonance chamber so that the inner end side is longer than the outer end side and extends deep into the resonance chamber. An exhaust pipe having a large number of exhaust holes is installed between the inner end portion of the introduction pipe and the substantially central portion in the longitudinal direction of the outlet pipe in the resonance chamber, and the end portion on the introduction pipe side in the exhaust pipe is installed. , A plurality of guide plates of appropriate shape having an exhaust passage formed in the central portion side, are arranged at appropriate intervals so that their outer peripheral ends are fixed to the inner peripheral surface of the introduction pipe. In the exhaust passage portion of each guide plate, a guide having an appropriate shape for guiding the exhaust introduced from the introduction pipe into each of the resonance chambers from each exhaust hole of the exhaust pipe while rotating and vortexing and reflecting the sound wave. A silencer for an internal combustion engine, which is equipped with a plate.