JP2005226605A - Exhaust pipe device of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe device, generating sporty exhaust sound like a racing car. <P>SOLUTION: A partition plate is provided in the interior of a communicating passage formed between an upstream main pipe and a downstream tail pipe, thereby forming exhaust sound generating passages divided in parallel in the stream direction of exhaust gas. When the sectional area of the main pipe is S1, the sectional area of an inlet part facing to the main pipe in the exhaust sound generating passage is S2a, the sectional area of an outlet part is S2b, and the sectional area of the tail pipe is S3, the exhaust pipe device is formed to satisfy the conditions: S1>S2a, S2a<S2b, S2a<S3, and S2b<S3, the inlet part constitutes a passing sound generating part, and the outlet part constitutes an echo sound generating part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an exhaust pipe device of an automobile, and more particularly to an exhaust pipe device that enables exhaust sound with a high sports feeling like a racing car.

The tone of the exhaust sound of an automobile is determined by the inherent exhaust sound that depends on the characteristics of the engine and the airflow sound of the exhaust gas that passes through the exhaust pipe. Exhaust pipe devices in ordinary passenger cars are often developed for the purpose of reducing exhaust noise, but in automobiles that focus on sportiness, such as sports cars, exhaust noise is an important concern for users. For this reason, there have been proposed an exhaust pipe device that changes the exhaust sound and an exhaust pipe device that enables a sporty exhaust sound.
JP 2002-349228 JP2003-3821 JP 2003-56340 A

  The conventional exhaust pipe device has a structure in which a large number of rectifying plates and the like are provided in the exhaust pipe in order to enable sporty exhaust sound, and the structure is complicated and the cost is high.

  In addition, while adopting a complicated structure, the quality of the exhaust sound depends on the user's preference, so there is a problem that it is not always welcomed by many enthusiasts.

  In view of the fact that the majority of sports car enthusiasts are familiar with racing car exhaust sounds (hereinafter referred to as “racing exhaust sounds”) in F1 races and touring car races, in general public road vehicles, It has been found that it is advantageous to provide an exhaust pipe device that enables a tone similar to such racing exhaust sound.

  Therefore, when the timbre is analyzed in detail, the racing exhaust sound is synthesized from the exhaust sound of the exhaust gas called “Hane”, which is peculiar to racing cars, and the sounding sound of “Wan”, and is therefore provided by the present invention. Even in an exhaust pipe device for a public road vehicle to be generated, it is considered that the majority of sports car enthusiasts are welcomed if a similar synthesized sound can be generated.

  As a result of researches and experiments conducted by the present inventor, a passing sound of “bean” can be generated by passing the exhaust gas along the blade-shaped plate member, or the flow rate of the exhaust gas flows. It was found that this can occur by raising in a part of the road. Further, it has been found that the sound “waan” can be generated by opening exhaust gas with an increased flow velocity toward a wide space in the flow path.

  By the way, an exhaust pipe device for a public road vehicle generally includes a main pipe extending from the exhaust manifold of the engine to the silencer, and extending from the silencer toward the rear of the vehicle body, and a tail pipe extended from the main pipe. The communication path is formed between the main pipe and the tail pipe. Therefore, if the racing exhaust sound generating device of the present invention is provided inside the communication passage, it is compact, and it is not necessary to make a major change to the overall structure of the exhaust pipe device, and can be implemented at low cost.

  Therefore, the present invention is configured as a first means in an exhaust pipe device in which a communication path is formed between an upstream main pipe that guides exhaust gas discharge and a downstream tail pipe. By providing a partition plate inside, an exhaust sound generation path divided in parallel with the flow direction of the exhaust gas is formed, and an outlet portion of the exhaust sound generation path is expanded toward the tail pipe. .

  Further, the present invention is configured as a second means in an exhaust pipe device in which a communication path is formed between an upstream main pipe that guides exhaust gas discharge and a downstream tail pipe. An exhaust sound generation path is formed by a partition plate provided inside, the cross-sectional area of the main pipe is S1, the cross-sectional area of the inlet facing the main pipe of the exhaust sound generation path is S2a, and the cross-sectional area of the tail pipe is S3 Then, S1> S2a and S2a <S3 are formed.

  In the embodiment of the present invention, the cross-sectional area S2a of the inlet part facing the main pipe of the exhaust sound generation path and the cross-sectional area S2b of the outlet part facing the tail pipe are formed so that S2a <S2b. Preferably, the cross-sectional area S2b of the outlet portion and the cross-sectional area S3 of the tail pipe are formed so that S2b <S3.

  According to the first aspect of the present invention, when the exhaust gas flowing through the main pipe passes through the exhaust sound generation path, a passing sound generating unit that generates a passing sound called “Hane” as a wind noise generated by the blade-shaped partition plate. Is formed. Then, the flux is expanded toward the tail pipe at the outlet of the exhaust sound generation path to form a sound generation unit that generates a sound “Wan”. Therefore, it is possible to generate racing exhaust sound that is synthesized from the exhaust sound of “high” that is unique to racing cars and the sound of “Wan”, and the exhaust pipe that sports car enthusiasts long for. There is an effect that an apparatus can be provided.

  According to the second aspect of the present invention, the cross-sectional area S1 of the main pipe and the cross-sectional area S2a of the inlet portion of the exhaust sound generation path are formed so that S1> S2a. A passing sound generating portion that increases the flow rate of the exhaust gas toward the downstream side is formed, thereby generating a passing sound called “bean”. Since the cross-sectional area S2a of the inlet portion and the cross-sectional area S3 of the tail pipe are formed so that S2a <S3, the sound that opens the exhaust gas whose flow velocity is increased in the passing sound generating portion on the downstream side. A sound generating part is formed, thereby generating a reverberating sound "Wan". Accordingly, in this case as well, the racing exhaust sound synthesized by the exhaust gas passing sound and the sounding sound can be generated as described above.

  Furthermore, according to the third aspect of the present invention, the cross-sectional area S2a of the inlet portion and the cross-sectional area S2b of the outlet portion of the exhaust sound generation path are formed so that S2a <S2b. Since the cross-sectional area S3 of S2b and the tail pipe is formed so that S2b <S3, the exhaust gas whose flow velocity is increased in the passing sound generating part of the inlet part passes through the sound generating part of the outlet part, and the tail pipe As a result, a second sound generation unit that is opened again when it flows into the sound is formed, and this has the effect of generating a more powerful sound “Bowan”.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
1 to 5 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, the exhaust pipe device includes an upstream metal main pipe 1 that guides exhaust gas toward the rear of the automobile, and a downstream side that extends in parallel rearward from the main pipe 1. Metal pipes 2 and 2, which are located between the main pipe 1 and the tail pipes 3, 3, that is, at the branches of the tail pipes 3 and 3. The communication passage 4 is formed, and the partition plate 5 made of a metal plate member is provided inside the communication passage 4 so that the exhaust sound generation paths 4s, 4s divided in parallel in the exhaust gas flow direction F. Is forming.

  FIG. 3 shows the manufacturing process of the device. As shown in FIG. 3 (A), the pipe material 3a for constituting the pair of tail pipes 3 and 3 is formed with a bent portion 3b having one end bent, and is bent as shown by a chain line in the drawing. The end of the portion 3b is cut along a cut line C1-C1 parallel to the axis ax of the pipe material 3a. Next, as shown in FIG. 3B, one pipe member 3a of the pair of pipe members 3a and 3a has a substantially D-shaped opening portion at the cut end (the lower half portion in the drawing). The partition plate 5 is closed, and the partition plate 5 is fixed to the opening edge by welding or the like. Thereafter, as shown in FIG. 3 (C), the pipe material 3a having the partition plate 5 and the pipe material 3a having no partition plate are abutted and opened so that the bent portions 3b and 3b are held together. After being fixed to each other along the edge by welding or the like, as indicated by a chain line in the drawing, the crests at the tips of the 3b and 3b are cut along a cut line C2-C2 perpendicular to the axis ax. As a result, as shown in FIG. 3D, tail pipes 3 and 3 composed of dual pipes 2 and 2 branched in a bifurcated manner are formed, and the communication path 4 is formed by the butted portions of the pair of tail pipes 3 and 3. The communication path 4 constitutes a pair of exhaust sound generation paths 4 s and 4 s divided by the partition plate 5. The exhaust sound generation paths 4s, 4s are located on both sides of the partition plate 5 and open semi-circular inlet portions 4a, 4a, and the pair of inlet portions 4a, 4a have a circular or oval shape as a whole. As shown in FIG. 3 (E), the exhaust pipe device is completed by fixing the end portion of the main pipe 1 to the inlet portions 4a and 4a as a whole by butt welding or the like.

  FIG. 4A shows a cross section of the main part of the exhaust pipe device according to the first embodiment of the present invention. The exhaust gas G guided by the upstream main pipe 1 is divided by the partition plate 5. The exhaust sound generation paths 4s and 4s enter from the inlet portion 4a and are discharged toward the tail pipe 3 from the outlet portion 4b. As shown in FIG. 4B, in the first embodiment, the cross-sectional area of the main pipe is S1, the cross-sectional area of the inlet portion 4a of the exhaust sound generation path 4s is S2a, the cross-sectional area of the outlet portion 4b is S2b, and the tail. When the cross-sectional area of the pipe 3 is S3, S1> S2a (specifically, S1≈S2a × 2), and S2a <S3 is formed, and further, S2a <S2b is formed. ing. At this time, in the illustrated embodiment, S2b≈S3 is formed, but S2b <S3 may be formed.

  Therefore, when the exhaust gas G guided by the main pipe 1 passes through the exhaust sound generation paths 4 s and 4 s and flows into the tail pipes 3 and 3, a passing sound of “Hean” is generated as a wind noise by the partition plate 5. . Moreover, when the exhaust gas G reaches the communication path 4, it is diverted by the partition plate 5, but it is not evenly divided so as to have a ½ flux. A flux exceeding ½ enters the path 4s, and a flux less than ½ enters the other exhaust sound generation path 4s. At this time, since the cross-sectional area S2a of the inlet portion 4a of the exhaust sound generation path 4s is formed as S1> S2a with respect to the cross-sectional area S1 of the main pipe 1, the exhaust gas flux is one of the exhaust sound generation paths. As soon as it enters the inlet portion 4a of 4s, the flow velocity can be rapidly increased by the nozzle effect of the inlet portion 4a. For this reason, the entrance part 4a forms a passing sound generating part 6 for generating a passing sound of “high” with a high exhaust gas.

  Then, the exhaust gas that has passed through the passing sound generating unit 6 is released with respect to the cross-sectional area S2a of the inlet part 4a so that the cross-sectional area S2b is directed toward the outlet part 4b formed so that S2a <S2b. For this reason, the exit portion 4b forms a reverberation generating portion 7 in which the exhaust gas generates a reverberation sound “Wan”.

  In this way, the exhaust pipe device uses the passing sound generation unit 6 and the sound generation unit 7 of the exhaust sound generation path 4s, and the exhaust gas passing sound called “hean”, which is unique to racing cars, and the sound “waan”. Generates racing exhaust sound by synthesis with sound.

  FIG. 4C shows a conventional technique, where a communication path 4p is formed between a main pipe 1p and a pair of tail pipes 3p and 3p branched from the main pipe. The cross-sectional area S1, the cross-sectional area S2a of the inlet portion of the communication path 4p, the cross-sectional area S2b of the outlet portion, and the cross-sectional area S3 of the tail pipe 3p are formed so that S1 <S2a, S2a> S2b, S2b = S3. Has been. Therefore, when the flux of the exhaust gas G guided by the main pipe 1p enters the inlet portion of the communication path 4p having a cross-sectional area S1 <S2a, the flux is widened by being opened, and the communication path 4p It is discharged from the outlet part to the tail pipe 3p while colliding with the bottom part of the water and forming a turbulent flow. Therefore, neither the passing sound of “Hane” nor the sound of “Wan” like the present invention is generated.

  FIG. 5A shows the side effect of the first embodiment of the present invention. In the illustrated case, the main pipe 1 is bent in a bent shape near the tail pipes 3 and 3, so that the exhaust gas G flowing through the main pipe 1 enters the communication path 4 while turning in the bent portion 1a. To do. Accordingly, the exhaust gas flux is displaced outwardly by centrifugal force in the swivel portion. Therefore, the exhaust gas tends to enter one of the pair of exhaust sound generation paths 4s and 4s, which is located on the outer side in the turning direction (exhaust sound generation path 4s in the drawing). Although strengthening, since the inlet section 4a of the exhaust sound generation path 4s has a sectional area of the opening reduced by the partition plate 5, the flux is divided by the partition plate 5, and both the exhaust sound generation paths 4s, 4s. The two pipes 2 and 2 are discharged naturally toward the pair of tail pipes 3 and 3. In the embodiment in which the bent portion 1a is provided, one exhaust sound generation path 4s (exhaust sound generation path 4s on the upper side in the drawing) greatly contributes to generation of passing sound and reverberation sound.

  On the other hand, FIG. 5 (B) shows a conventional technique having a similar bent portion 1a, and the communication path 4p formed between the main pipe 1p and the pair of tail pipes 3p and 3p has the above-described structure. Such a partition plate is not provided. Therefore, the exhaust gas flux swirling in the bent portion 1a enters the communication path 4p as it is while receiving a centrifugal force, and enters one tail pipe 3p (the upper tail pipe 3p in the drawing) located outside the swirling direction. Since it enters and hardly enters the other tail pipe 3p, the significance of providing a pair of dual pipes is reduced.

(Second Embodiment)
FIG. 6 shows a second embodiment of the present invention, wherein the main pipe 1 forms a tapered throttle portion 1b whose inner diameter is reduced toward the communication path 4, and the front end of the partition plate 5 is It faces the vicinity of the aperture 1b. Other configurations are the same as those of the first embodiment described above.

  Therefore, according to the second embodiment, the cross-sectional area S2a of the inlet portion 4a of the exhaust sound generation path 4s is made smaller than the cross-sectional area of the inlet portion of the first embodiment described above, and as a result, the main pipe 1 is disconnected. The difference (S1−S2a) between the area S1 and the sectional area S2a of the inlet portion 4a becomes significant, and the difference between the sectional area S2a of the inlet portion 4a and the sectional area S2b of the outlet portion 4b (S2b−S2a) becomes significant. Therefore, it is possible to further improve the generation of the passing sound “Hane” and the sounding sound “Wan” as described above.

(Third embodiment)
7 to 9 show a third embodiment of the present invention. As shown in FIGS. 7 and 8, the exhaust pipe device includes an upstream main pipe 1 that guides exhaust gas toward the rear of the automobile, a downstream tail pipe 3, a main pipe 1, and a tail pipe 3. A trumpet-shaped pipe 8 is provided between the main pipe 1 and the tail pipe 3 so that the diameter of the tail pipe 3 is considerably larger than the diameter of the main pipe 1. And tapered. Therefore, the communication path 4 is formed by the trumpet-shaped pipe 8, and by providing the partition plate 5 that divides the communication path 4 in the diameter direction, a pair of exhaust gases divided in parallel in the exhaust gas flow direction F is provided. Sound generation paths 4s and 4s are formed. FIG. 8 (A) shows an embodiment in which the partition plate 5 is provided only in the inner space of the trumpet-shaped pipe 8, and FIG. 8 (B) is provided in the inner space of the trumpet-shaped pipe 8. An embodiment in which the partition plate 5 has an extension portion 5 a extended to the inside of the tail pipe 3 is shown.

  FIG. 9A shows a cross-section of the main part of the exhaust pipe device according to the third embodiment of the present invention, and the exhaust gas G guided by the upstream main pipe 1 is separated in the communication passage 4 by the partition plate. 5, and flows into the exhaust sound generation paths 4 s and 4 s from the inlet 4 a and is discharged from the outlet 4 b toward the tail pipe 3. As shown in the figure, in this third embodiment, the cross-sectional area of the main pipe is S1, the cross-sectional area of the inlet portion 4a of the exhaust sound generation path 4s is S2a, the cross-sectional area of the outlet portion 4b is S2b, and the cross-sectional area of the tail pipe 3 is shown. When S3 is S3> S2a (in the specific example, S1≈S2a × 2), S2a <S3 is formed, and S2a <S2b is formed. S2b <S3 (in the specific example, S3≈S2b × 2).

  Therefore, when the exhaust gas G guided by the main pipe 1 passes through the exhaust sound generation paths 4 s and 4 s and flows into the tail pipes 3 and 3, a passing sound of “Hean” is generated as a wind noise by the partition plate 5. . Moreover, when the exhaust gas G reaches the communication path 4, it is diverted by the partition plate 5, but it is not evenly divided so as to have a ½ flux. A flux exceeding ½ enters the path 4s, and a flux less than ½ enters the other exhaust sound generation path 4s. At this time, since the cross-sectional area S2a of the inlet portion 4a of the exhaust sound generation path 4s is formed as S1> S2a with respect to the cross-sectional area S1 of the main pipe 1, the exhaust gas flux is one of the exhaust sound generation paths. As soon as it enters the inlet portion 4a of 4s, the flow velocity can be rapidly increased by the nozzle effect of the inlet portion 4a. For this reason, the entrance part 4a forms a passing sound generating part 6 for generating a passing sound of “high” with a high exhaust gas.

  Then, the exhaust gas that has passed through the passing sound generating unit 6 is released with respect to the cross-sectional area S2a of the inlet part 4a so that the cross-sectional area S2b is directed toward the outlet part 4b formed so that S2a <S2b. For this reason, the exit portion 4b forms a reverberation generating portion 7 in which the exhaust gas generates a reverberation sound “Wan”.

  In this way, the exhaust pipe device uses the passing sound generation unit 6 and the sound generation unit 7 of the exhaust sound generation path 4s, and the exhaust gas passing sound called “hean”, which is unique to racing cars, and the sound “waan”. Generates racing exhaust sound by synthesis with sound.

  Furthermore, in this third embodiment, when the exhaust gas enters the tail pipe 3 from the outlet part 4b of the exhaust sound generation path 4s, the cross-sectional area of the flow path is almost doubled, so the sound of the outlet part 4b A flux of exhaust gas flowing into the tail pipe 3 via the sound generator 7 is released at once in a diffusing direction, and a second sound generator 9 is formed that generates a powerful “Bowan” sound. The exhaust sound that emphasizes the sound is generated.

  FIG. 9B shows the prior art, in which the main pipe 1p, the trumpet-shaped pipe 8p, and the tail pipe 3p are sequentially connected from the upstream side to the downstream side, and the communication path is formed by the trumpet-shaped pipe 8p. 4p is formed, but the cross-sectional area S1 of the main pipe 1p, the cross-sectional area S2a of the inlet portion of the communication path 4p, the cross-sectional area S2b of the outlet portion, and the cross-sectional area S3 of the tail pipe 3p are S1 ≦ S2a < As S2b ≦ S3, it is formed so as to gradually increase from the upstream side toward the downstream side. Accordingly, when the flux of the exhaust gas G flowing through the main pipe 1p enters the inlet portion of the communication path 4p having a cross-sectional area S1 ≦ S2a, the flux is widened while being opened, and further diffused toward the outlet portion. Then, it is spread and discharged as it is to the tail pipe 3p. Therefore, a passing sound such as “bean” as in the present invention is not generated.

(Fourth embodiment)
FIG. 10 shows a fourth embodiment of the present invention. The exhaust pipe device includes an upstream first main pipe 1x for guiding exhaust gas, a downstream tail pipe 3, and a trumpet pipe 8 provided between the first main pipe 1x and the tail pipe 3. The diameter of the tail pipe 3 is formed to be considerably larger than the diameter of the first main pipe 1x, and the trumpet-shaped pipe 8 is tapered from the first main pipe 1x toward the tail pipe 3. .

  A partition plate 5 is provided inside the communication path 4 formed by the trumpet-shaped pipe 8, and the divided communication path 4 x and the exhaust sound generation path 4 s divided by the partition plate 5 are arranged in parallel in the exhaust gas flow direction F. The second main pipe 1 communicating with the exhaust sound generation path 4 s is connected to an opening provided in the tapered wall of the trumpet-shaped pipe 8. Therefore, in the exhaust pipe device of the third embodiment, the tail from the first main pipe 1x to the tail pipe 3 via the divided communication path 4x and the tail from the second main pipe 1 via the exhaust sound generation path 4s. A second flow path F2 reaching the pipe 3 is formed in parallel.

  Although not shown, the muffler pipe led from the exhaust manifold of the automobile engine is bifurcated, and one branch pipe is led directly to the first main pipe 1x without going through the silencer. The other branch pipe is led to the second main pipe 1 via a silencer, and a valve is provided that allows the exhaust gas from the exhaust manifold to be selectively led to one of the branch pipes. ing. Accordingly, when the exhaust gas is guided to the first main pipe 1x by switching the valve, the exhaust gas does not pass through the silencer, which is suitable for circuit driving or the like. When the exhaust gas is guided to the second main pipe 1, Since exhaust gas passes through a silencer, it is suitable for driving on public roads. At this time, the valve switching structure may be further configured to guide the exhaust gas to the first main pipe 1x and the second main pipe 1 simultaneously in parallel. The exhaust pipe device may be configured to guide exhaust gas that has passed through the silencer to the first main pipe 1x and lead exhaust gas that has not passed through the silencer to the second main pipe 1 contrary to the above.

  Therefore, according to the exhaust pipe device according to the fourth embodiment, the exhaust gas G guided by the second main pipe 1 enters the exhaust sound generation path 4s from the inlet 4a and tails from the outlet 4b. It is discharged toward the pipe 3. As shown, the cross-sectional area of the second main pipe 1 is S1, the cross-sectional area of the inlet portion 4a of the exhaust sound generation path 4s is S2a, the cross-sectional area of the outlet portion 4b is S2b, and the cross-sectional area of the tail pipe 3 is S3. At this time, S1> S2a is satisfied, S2a <S3 is formed, S2a <S2b is formed, and S2b <S3 is further formed.

  Therefore, the flow rate of the exhaust gas G guided by the second main pipe 1 having the cross-sectional area S1 is rapidly increased by the nozzle effect of the inlet portion 4a of the exhaust sound generation path 4s, and is increased by the inlet portion 4a. A passing sound generating unit 6 for generating a passing sound of “high” due to the exhaust gas is formed. Then, the exhaust gas that has passed through the passage sound generator 6 is released from the inlet portion 4a toward the outlet portion 4b that gradually spreads to widen the flux. The outlet portion 4b causes the exhaust gas to make a sound of “Wan”. A generated sound generation unit 7 is formed. In this way, the racing sound generation unit 6 and the sound generation unit 7 generate the racing exhaust sound by synthesizing the high-frequency exhaust gas “Wane” and the sound “Wan” that are unique to racing cars. .

  Furthermore, when the exhaust gas enters the tail pipe 3 from the outlet part 4b of the exhaust sound generation path 4s, the cross-sectional area of the flow path is doubled or more, so that the tail passes through the sound generation part 7 of the outlet part 4b. The exhaust gas flux flowing into the pipe 3 is released at once in the diffusion direction, thereby forming a second reverberating sound generating unit 9 for generating a powerful sound “Bowan”. Exhaust sound that emphasizes is generated.

(Other configurations)
The present invention is not limited to the illustrated embodiment described above, and various design changes and additions of technical configurations are possible based on the matters described in the claims. For example, the terms “main pipe” and “tail pipe” described above are provided in the middle part of the muffler pipe, such as the pipe at the tail end of the exhaust pipe device as shown in the figure, and the substantially central part of the lower surface of the car body of the automobile. In short, it should be understood that the main pipe is the upstream side and the tail pipe is the downstream side. Further, in the appended claims, reference numerals corresponding to the respective components are added for the sake of convenience, but the components are not limited to those shown in the drawings.

It is a perspective view which shows the rear part of the motor vehicle provided with the exhaust pipe device which concerns on 1st Embodiment of this invention. It is a perspective view showing the appearance of the exhaust pipe device concerning a 1st embodiment of the present invention. The manufacturing process of the exhaust pipe device which concerns on 1st Embodiment of this invention is shown, (A) (B) (C) (D) (E) is a perspective view which shows a process in order. It is sectional drawing of an exhaust pipe apparatus, (A) is sectional drawing explaining the effect | action of the exhaust pipe apparatus which concerns on 1st Embodiment of this invention, (B) is the exhaust pipe apparatus which concerns on 1st Embodiment of this invention. Sectional drawing explaining a structure, (C) is sectional drawing explaining the structure of the exhaust pipe apparatus which concerns on a prior art. It is sectional drawing explaining the side effect of an exhaust pipe apparatus, (A) is sectional drawing explaining the effect | action of the exhaust pipe apparatus which concerns on 1st Embodiment of this invention, (B) is the exhaust pipe apparatus which concerns on a prior art. It is sectional drawing explaining an effect | action. The exhaust pipe apparatus which concerns on 2nd Embodiment of this invention is shown, (A) is a perspective view explaining an external appearance, (B) is sectional drawing explaining a structure. It is a perspective view which shows the rear part of the motor vehicle provided with the exhaust pipe apparatus which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the external appearance of the exhaust pipe device which concerns on 3rd Embodiment of this invention, (A) is a perspective view which shows 1 Example, (B) is a corporate bond figure which shows a modified example. It is sectional drawing of an exhaust pipe device, (A) is sectional drawing explaining the structure of the exhaust pipe apparatus which concerns on 3rd Embodiment of this invention, (B) is sectional drawing explaining the structure of the exhaust pipe apparatus based on a prior art. FIG. The exhaust pipe apparatus which concerns on 4th Embodiment of this invention is shown, (A) is a perspective view which shows the external appearance of the exhaust pipe apparatus which concerns on 4th Embodiment, (B) is the exhaust pipe apparatus which concerns on 4th Embodiment It is sectional drawing which shows this structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main pipe 3 Tail pipe 4 Communication path 4s Exhaust sound generation path 4a Inlet part 4b Outlet part 5 Partition plate 6 Passing sound generating part 7 Sound generating part 9 Second sound generating part

Claims (3)

In an exhaust pipe device in which a communication path (4) is formed between an upstream main pipe (1) for guiding exhaust gas discharge and a downstream tail pipe (3), a partition plate (5 ) Is formed, the exhaust sound generation path (4s) divided in parallel in the exhaust gas flow direction is formed, and the outlet (4b) of the exhaust sound generation path is expanded toward the tail pipe (3). An exhaust pipe device for an automobile characterized by comprising: In an exhaust pipe device in which a communication path (4) is formed between an upstream main pipe (1) for guiding exhaust gas discharge and a downstream tail pipe (3), a partition plate provided inside the communication path (5) forms an exhaust sound generation path (4s), and the cross-sectional area of the main pipe (1) is S1, and the cross-sectional area of the inlet portion (4a) facing the main pipe of the exhaust sound generation path (4s) is S2a. An exhaust pipe device for an automobile, wherein the tail pipe (3) is formed such that S1> S2a and S2a <S3 when the cross-sectional area of the tail pipe (3) is S3. The cross-sectional area S2a of the inlet part (4a) facing the main pipe of the exhaust sound generation path (4s) and the cross-sectional area S2b of the outlet part (4b) facing the tail pipe are formed so that S2a <S2b. The exhaust pipe device for an automobile according to claim 1 or 2, wherein the cross-sectional area S2b of the outlet portion (4b) and the cross-sectional area S3 of the tail pipe (3) are formed so as to satisfy S2b <S3. .

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