JP3075432U - Car silencer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a silencer having an orderly silence / exhaust path and improved silence / exhaust action. SOLUTION: First, second and third muffle chambers are formed from a partition upstream of a silencer outer cylinder by a partition plate, and a main exhaust pipe is connected to an upstream side plate of the outer cylinder and each of the partition plates. An exhaust pipe larger than the diameter of the main exhaust pipe, and communicated with an expansion chamber provided in the third muffler chamber;
A pair of U-shaped bent pipes or one branch pipe is branched from the expansion chamber, and a U-shaped bent portion of the branch pipe is protruded outside the upstream side plate of the outer cylinder. The part is provided in the outer cylinder in parallel with the main exhaust pipe, and further, the branch pipe is brought into contact with and penetrates the downstream side plate of the muffler to form a discharge port. Exhaust holes are formed in the peripheral surface of the sound deadening chamber with the branch pipe and the peripheral surface of the expansion chamber, and each sound deadening chamber is filled with a sound absorbing material.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a muffler for an automobile in which an exhaust path for reducing exhaust resistance is formed and a noise reduction effect is improved.

[0002]

[Prior art]

 2. Description of the Related Art A muffler for a vehicle according to the prior art is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 1983-42318, as cited as a conventional muffler, in which the inside of an outer cylinder constituting the body of the muffler is partitioned by a plurality of partition plates. Each of the partitioned chambers is filled with a sound absorbing material to form a muffling chamber or a resonance chamber, and these chambers communicate with each other through a plurality of exhaust pipes.

In such a conventional silencer, the exhaust gas from the engine is exhausted by the back pressure of the exhaust gas into the exhaust pipe or the exhaust pipe provided in the outer cylinder. Through a number of holes, the exhaust route to the silencer or resonance chamber filled with sound-absorbing material is circulated and silenced and exhausted to the atmosphere through the silencer outlet. And a mute route.

[0004]

[Problems to be solved by the invention]

 As described above, if the structure of the exhaust route in the muffler becomes complicated, resistance to the back pressure is caused, and turbulence is generated in the exhaust gas flow path. Exhaust efficiency is significantly reduced, which causes inconvenience that lowers engine efficiency.

[0005] In addition, if the technical consideration of the noise reduction route that the noise reduction room and the expansion room in the noise reduction device are arranged in an orderly manner according to the flow of the exhaust gas, the noise reduction efficiency is reduced, In addition, there is a problem that it is difficult to uniformly fill the sound deadening room with the sound absorbing material or the like, which may cause variations in sound deadening performance of individual products.

[0006]

[Means for Solving the Problems]

 The muffler for a vehicle according to the present invention is characterized in that a sealed outer cylinder constituting a main body of the muffler is partitioned by a partition plate to form first, second, and third muffler chambers from upstream to downstream, respectively. A pair of branch pipes which are made to penetrate the pipe by contacting the upstream side plate of the outer cylinder and the respective partition plates, communicate with an expansion chamber provided in the third sound deadening chamber, and branch from the expansion chamber. With their U-shaped bent portions protruding outside the upstream side plate of the outer cylinder, and the straight pipe portion of the branch pipe arranged in the outer cylinder side by side with the main exhaust pipe, and further, the branch pipe is silenced. A discharge port for exhaust gas is formed by contacting and penetrating the side plates on the downstream side of the vessel, respectively, to form a discharge port for exhaust gas. Exhaust holes are drilled in the peripheral surface of the branch pipe part and the peripheral surface of the expansion chamber, It is characterized in that filled with sound absorbing material.

Further, the muffler for an automobile according to the present invention is characterized in that the branch pipe is formed as one branch pipe and is arranged in parallel with the main exhaust pipe.

[0008]

[Embodiment of the invention]

 Hereinafter, the vehicle silencer of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a muffler for an automobile according to the present invention, FIG. 2 is a transverse sectional view taken along a line AA in FIG. 1, and FIG. 3 is a longitudinal section of a muffler comprising one branch pipe. FIG. 4 is a cross-sectional view taken along the line AA of FIG.

In each of the drawings, 1 is an outer cylinder, 2 is an upstream side plate of the outer cylinder, 3 is a downstream side plate of the outer cylinder, 4 is a main exhaust pipe, 5 is a first silencer, and 6 is a second silencer. , 7 is a third silencing chamber, 8 is an upstream partition plate, 9 is a downstream partition plate, 10 is an expansion chamber, 11 is a peripheral surface of the expansion chamber, 12 is a branch pipe, 13 is an exhaust outlet, and 14 is an exhaust port. The hole 15 is a sound absorbing material.

As described in claim 1, in the muffler for an automobile according to the present invention, the first muffler chamber 5 and the second muffler chamber 6 are arranged from the upstream side to the downstream side of the sealed outer cylinder 1. And the third sound deadening chamber 7 is formed by being partitioned by two partition plates 8 and 9. Further, the third sound deadening chamber 7 is formed with an exhaust pipe having a diameter larger than that of the main exhaust pipe 4, and has an expansion chamber 10 in which a number of exhaust holes 14 are formed in a peripheral surface 11 thereof. .

As shown in FIG. 1, the main exhaust pipe 4 extends in contact with the upstream side plate 2 of the outer cylinder 1 and the partition plates 8 and 9 that partition the outer cylinder 1, respectively. It is provided so as to communicate with the chamber 10. Further, a pair of branch pipes 12 (12a, 12b) each formed of a U-shaped bent pipe are formed to branch from the expansion chamber 10 in a state where they are juxtaposed with the main exhaust pipe 4. In this case, the U-shaped bent portion of the branch pipe 4 is protruded from the side plate 2 on the upstream side of the outer cylinder 1 toward the outside of the muffler, and the straight pipe portion of the branch pipe 4 is provided inside the outer cylinder 1. The partition plates 8 and 9 are provided so as to come into contact with and penetrate the side plate 3 on the downstream side of the outer cylinder 1 to form a pair of exhaust discharge ports 13 as shown in FIG. ing. As described above, the U-shaped bent portion of the branch pipe 12 composed of a U-shaped pipe projects from the side plate 2 on the upstream side of the outer cylinder 1 toward the outside of the muffler, so that the muffler can be downsized. can do.

As shown in FIG. 1, an upstream partition plate 8 and a downstream partition plate 9 separate from the upstream to the downstream, and the main exhaust pipe 4 and the branch pipe 12 are separated as described above. A first silencing chamber 5 and a second silencing chamber 6 in which a straight pipe portion is provided are provided. A large number of exhaust holes 14 are formed on the peripheral surface of the main exhaust pipe 4 provided in the first muffler chamber 5 and on the peripheral surface of the branch pipe 12 provided in the second muffler chamber 6. Are drilled.

The space formed between the main exhaust pipe 4, the pair of branch pipes 12 and the expansion chamber 10, and the partition plates 8 and 9 provided on the upstream side and the downstream side, respectively, ie, the first silencer The chamber 5, the second silencing chamber 6, and the third silencing chamber 7 are all filled with a sound absorbing material 15.

Exhaust gas discharged from the engine is introduced into the expansion chamber 10 through the main exhaust pipe 4. In this process, the exhaust gas is supplied to a large number of exhaust holes formed in the peripheral surface of the main exhaust pipe 4 provided in the first silencing chamber 5 and the peripheral surface 11 of the expansion chamber. 14, the air is introduced into the first silencing room 5 and the third silencing room 7 and is efficiently silenced.

As shown in FIG. 1, the expansion chamber 10 is formed by an exhaust pipe having a diameter larger than that of the main exhaust pipe 4 so that a large space is formed. Exhaust gas introduced from the main exhaust pipe 4 into the expansion chamber 10 is blown out into a wide space formed by the expansion chamber 10 to be expanded and silenced.

As described above, the exhaust gas that has entered the expansion chamber 10 is silenced there, and further enters the third silence chamber 7 to be efficiently silenced. The exhaust gas in the expansion chamber 10 is returned to the expansion chamber 10 from the third silencing chamber 7, flows into a pair of branch pipes 12 branched directly from the expansion chamber 10, and flows into the second silencing chamber 6. The air is introduced into the second silencing chamber 6 through the exhaust holes 14 formed on the respective peripheral surfaces of the branch pipe 12 provided therein, and is silenced.

As shown in FIGS. 1 and 2, the exhaust gas muffled in each of the mufflers 7, 8, 9 passes through an exhaust passage formed by a U-shaped branch pipe 12. The air is discharged from the exhaust outlet 13 into the atmosphere.

As described above, the exhaust route of the vehicle silencer according to the present invention is such that exhaust gas from the engine is diverted from the main exhaust pipe 4 to the pair of branch pipes 12 through the expansion chamber 10. Thus, an orderly exhaust route is formed in which the exhaust gas is discharged from the exhaust outlet 13 into the atmosphere. Such an exhaust route provides a silencer with low exhaust pressure resistance and interference and high exhaust efficiency.

Further, as described above, in the muffler route of the vehicle silencer according to the present invention, the exhaust gas flowing through the main exhaust pipe is first silenced in the first silence chamber 5 formed on the upstream side. Next, it is introduced into the expansion room 10 and diffused and silenced, and further silenced in the third silence room 7. Further, the exhaust gas diverted from the expansion chamber 10 to the branch pipe 12 is silenced in the second silencing chamber 6, is returned to the U-shaped flow path of the branch pipe 12, and is discharged from the discharge port 13 into the atmosphere. It is structured to be. In such a silencing route, the generation and interference of turbulence due to the merging of exhaust gas are minimized, and efficient silencing is promoted. At the same time, the above-described silencing route, in combination with the neat exhaust route, contributes to the improvement of the exhaust performance of the silencer according to the present invention.

Further, the vehicle silencer according to the present invention is, as described in claim 2 and as shown in FIGS. 3 and 4, merely for shunting exhaust gas from the expansion chamber 10. It is provided as a silencer provided with one branch pipe 12. In this case, the exhaust gas from the expansion chamber 10 passes through only one flow path formed by the branch pipe 12 and passes through an exhaust hole 14 formed in the peripheral surface of the branch pipe 12 located in the second sound deadening chamber. Then, the air is introduced into the second silencing chamber 6 and silenced, and is discharged to the atmosphere from the exhaust discharge port 14 formed by the branch pipe 12. By arranging the number of the branch pipes 12 as one branch pipe, a large-diameter exhaust pipe can be used for the branch pipe 12, so that the flow rate of exhaust gas flowing through the exhaust route of the silencer having a silencing function is reduced. In addition, the exhaust action is promoted and the silencing effect is not diminished.

[0022]

[Effect of the invention]

 As described above, the exhaust muffler of the automobile silencer according to the present invention has a main exhaust pipe, an expansion chamber, a pair or one branch pipe, and an exhaust discharge port. Since the exhaust route is well-ordered, a silencer with high exhaust efficiency can be provided.

In the muffler for a vehicle according to the present invention, the exhaust gas flowing through the main exhaust pipe is first silenced in a first silencer chamber formed on the upstream side, and then introduced into an expansion chamber to diffuse and muffle. In the process of being silenced in the third silencer chamber formed further downstream and diverted from the expansion chamber to the branch pipe, the silencer is silenced in the second silencer chamber formed in the center of the silencer and discharged to the atmosphere. Since the route is formed, generation of turbulent airflow due to irregular merging of exhaust gas in each flow path and other interference factors are suppressed to a small extent, and an efficient silencing operation is remarkably promoted. In addition, such an orderly silencing route for the exhaust gas further enhances the exhaust effect.

Further, in the muffler for a vehicle according to the present invention, since the exhaust / muffler route arranged as described above is employed, it is easy to mount the main exhaust pipe and fill the sound absorbing material. In addition, it is possible to reduce the size of the muffler by using a structure in which the U-shaped bent portion of the U-shaped branch pipe is projected from the upstream side plate of the outer cylinder toward the outside of the muffler. As a result, an economical product can be provided in terms of the production cost of the silencer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a muffler for an automobile,

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is a longitudinal sectional view of a silencer including one branch pipe.

FIG. 4 is a cross-sectional view taken along a line AA in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Upstream side plate of outer cylinder 3 Downstream side plate of outer cylinder 4 Main exhaust pipe 5 First muffler room 6 Second muffler room 7 Third muffler room 8 Downstream partition plate 9 Upstream partition plate 10 Expansion room 11 peripheral surface of expansion chamber 12 branch pipe 13 exhaust discharge port 14 exhaust hole 15 sound absorbing material

Claims (2)

[Utility model registration claims] 1. A main exhaust pipe from an engine, wherein a sealed outer cylinder constituting a main body of a silencer is partitioned by a partition plate to form first, second, and third silence chambers from upstream to downstream, respectively. (Hereinafter, referred to as a main exhaust pipe) is brought into contact with the upstream side plate of the outer cylinder and the respective partition plates and penetrates the exhaust pipe, and an exhaust pipe provided in the third sound deadening chamber and having a diameter larger than the main exhaust pipe. A pair of U-shaped bent tubular branch pipes (hereinafter referred to as “branch pipes”), which are connected to an expansion chamber (hereinafter referred to as “extension chamber”) and branched from the expansion chamber, are connected to a U-shaped bent portion of the branch pipe. The outer pipe protrudes outside the upstream side plate, and the straight pipe portion of the branch pipe is provided in the outer cylinder in parallel with the main exhaust pipe, and the branch pipe abuts on the downstream side plate of the muffler. To form a discharge port for exhaust gas, which is provided in the first muffler chamber. Exhaust holes are formed in the peripheral surfaces of the main exhaust pipe portion, the branch pipe portion provided in the second noise reduction chamber, and the expansion chamber, and each of the noise reduction chambers is made of a sound absorbing material. An automotive silencer characterized by being filled. 2. The muffler for an automobile according to claim 1, wherein said branch pipe is formed as one branch pipe and is arranged in parallel with a main exhaust pipe.