JP5937741B1 - Exhaust muffler for vehicles - Google Patents

Abstract

An exhaust muffler for a vehicle that can be adapted to the type and vehicle type of an internal combustion engine and improve the power value, torque value, and fuel efficiency. An exhaust system is constituted by a tail pipe and a chamber. The chamber is mounted on the internal combustion engine side of the exhaust pipe. The tail pipe 10 is attached to the exhaust side end of the exhaust pipe. A fin 11 and a rectifying cylinder 13 are arranged in the tail pipe 10. The fin 11 is provided so as to discharge the exhaust gas while swirling. A dimple-shaped recess 10A is formed on a part or the whole of the exhaust gas contact surface in the tail pipe 10. [Selection] Figure 4

Description

  The present invention aims to improve fuel efficiency as well as power up the internal combustion engine by combining a chamber mounted on the internal combustion engine side of the exhaust pipe in the exhaust muffler and a tail pipe mounted on the exhaust side end of the exhaust pipe. Moreover, the present invention relates to a vehicle exhaust muffler that also has an effect of reducing exhaust noise.

  Conventionally, by forming dimples (dents) on the surface of an object, the effect of generating turbulent flow (lowering the critical Reynolds number of the object), called the Magnus effect, and the effect of suppressing drag are known. . Such dimple effect is practically used mainly as an effect of extending the flight distance of the golf ball. On the other hand, Patent Documents 1 to 3 describe an exhaust muffler structure that employs dimple-like irregularities in a vehicle exhaust muffler to improve engine power, improve fuel efficiency, or reduce exhaust noise. Yes.

  The exhaust pipe for an automobile engine described in Patent Document 1 describes a configuration in which a plurality of protrusions are formed on the inner wall surface of the exhaust pipe. In order to form this protrusion, a steel ball is made to collide with the outer surface of the pipe to form a hemispherical recess on the outer peripheral surface of the pipe, and this recess becomes a plurality of protrusions on the inner wall surface of the exhaust pipe. In the cited document 1, this projection increases the flow rate of the exhaust gas, reduces the back pressure in the exhaust pipe, and improves the engine output and fuel consumption.

  Further, the engine exhaust device described in Patent Document 2 describes a configuration in which a large number of small irregularities are provided on the inner wall surface of an exhaust gas circulation pipe. This small unevenness is a combination of a dimple-like concave portion and a convex portion formed by a hill-like ridge. If this small unevenness is formed in the exhaust gas circulation pipe, the exhaust gas circulation resistance is reduced, the back pressure of the engine is lowered, and even a slight influence has a positive effect on the engine output and fuel consumption.

  Further, the exhaust system structure of the internal combustion engine described in Patent Document 3 shows an exhaust system structure in which a plurality of uneven portions are formed on the inner surface of the exhaust pipe. The uneven portion formed on the inner surface of the exhaust pipe is a dimple-shaped recess formed by embossing. This concave portion increases the sound wave of the exhaust noise and the wall friction between the inner surface of the exhaust pipe, and the sound is also absorbed in the exhaust pipe, which makes it possible to reduce the exhaust noise inside the exhaust pipe which has not been conventionally performed. It is.

  On the other hand, the applicant has developed an exhaust muffler with a tail pipe as described in Patent Document 4, and has left a practical research result on improving the performance of the exhaust muffler. This exhaust muffler is a combination of a chamber mounted on the internal combustion engine side of the muffler and a tail pipe mounted on the exhaust side end of the muffler. A diffusion hole is provided in the diffusion exhaust pipe of the chamber. In addition, the effect of increasing the power value and torque value of the internal combustion engine by providing fins inside the tail pipe has been demonstrated.

Japanese Utility Model Publication No. 63-110618 Japanese Utility Model Publication No. 1-174514 Japanese Patent Laid-Open No. 11-324667 Japanese Patent No. 5046171

  However, in the exhaust structures described in Patent Documents 1 to 3, all the positions where the irregularities are formed are arranged inside the exhaust pipe located before and after the muffler (silencer). In the experiment conducted by the present applicant, when a dimple-shaped recess is formed at such a position, the exhaust efficiency varies greatly depending not only on the length of the exhaust pipe but also on the structure of the muffler (silencer) and the difference in the exhaust amount. In addition, it has been found that a stable and effective effect cannot be obtained. As a result, the effects of the engine output, etc. claimed in the exhaust structures described in Patent Documents 1 to 3 are limited to the effects on the test, and the effective effects that can be obtained by mounting on an actual vehicle are obtained. It is not done.

  On the other hand, according to the exhaust muffler with a tail pipe described in Patent Document 4, by combining a chamber with a diffusion hole and a tail pipe with a fin, the power value and torque value of the internal combustion engine are increased, and the fuel efficiency is improved. The improvement effect has been demonstrated and it has been successfully commercialized. Moreover, the various effects of this product are highly appreciated by users. However, as the current vehicles are reciprocating and diesel engines, as well as hybrid engines, the structure of exhaust systems has been diversified every day and the types of vehicle models have changed. It is desired to provide an exhaust muffler for a vehicle that can be adapted to many types of internal combustion engines and vehicle types and can enhance the effects such as engine power and fuel consumption more than ever.

  Therefore, the present invention pays attention to the exhaust efficiency due to the unevenness provided on the inner surface of the conventional exhaust pipe, and by promoting research and development to further improve the exhaust structure of the current product, it is possible to increase the number of internal combustion engines and vehicle types with a compact configuration. The present invention aims to provide an exhaust muffler for a vehicle that can cope with it, increase a power value and a torque value, improve fuel efficiency, and obtain a noise reduction effect.

In order to achieve the above-mentioned object, the first means in the present invention includes a chamber 20 mounted on the internal combustion engine side of the exhaust pipe 1 and a tail pipe 10 mounted on the exhaust side end of the exhaust pipe 1. In the exhaust muffler for vehicles,
A cylinder 12 constituting the tail pipe 10, a rectifying cylinder 13 disposed at the center of the cylinder 12 through which exhaust gas passes, and a plurality of fins disposed between the rectifying cylinder 13 and the cylinder 12 11, and the fin 11 surrounds the outer surface of the rectifying cylinder 13 and is arranged so that the exhaust gas passes while spirally turning, and many fins 11 are disposed on the exhaust gas contact surface of the tail pipe 10. A dimple-like recess 10A is formed,
The chamber 20 includes a cover body 21 that is mounted so as to wrap the outer surface of the exhaust pipe 1, and an internal exhaust pipe 22 that opens inside the cover body 21 and is connected to the exhaust pipe 1. Are arranged so that the openings of the diffusion exhaust pipe 22A provided on the exhaust gas inflow side and the compression exhaust pipe 22B provided on the exhaust gas discharge side are separated inside the cover body 21, and The number of the diffusion exhaust pipe 22A and the compression exhaust pipe 22B is one or two, and the number of the diffusion exhaust pipe 22A and the compression exhaust pipe 22B can be selected according to the internal combustion engine and the vehicle type. It is to have done.

  In the second means, the recess 10A formed on the exhaust gas contact surface of the tail pipe 10 is formed on one side or both side surfaces of the fin 11, and the inner surface or both inner and outer side surfaces of the rectifying cylinder 13, and The cylindrical body 12 is formed so as to be selectable from a part or the whole of the inner side surface.

  In the third means, the cylindrical body 12 of the tail pipe 10 has a cylindrical shape having the same diameter in the exhaust direction, a tapered shape in which the diameter in the exhaust direction is enlarged, or an inverse in which the diameter in the exhaust direction is narrowed. It is formed in a tapered shape.

The diameter of the opening of the diffusion exhaust pipe 22A of the fourth means is formed so as to be larger than the diameter of the opening of the compression exhaust pipe 22B, and at least a part of each opening faces each other. Is arranged.

According to the first aspect of the present invention, the cylinder 12 constituting the tail pipe 10, the rectifying cylinder 13 disposed at the center of the cylinder 12 and through which the exhaust gas passes, the rectifying cylinder 13 and the cylinder 12, A plurality of fins 11 disposed between the fins 11, and the fins 11 are arranged so as to surround the outer surface of the rectifying cylinder 13 so that the exhaust gas swirls in a spiral manner, and the tail 11 Since a large number of dimple-like recesses 10A are formed on the exhaust gas contact surface of the pipe 10, the power value and torque value can be increased to an effective level that cannot be obtained with a conventional exhaust structure in which irregularities are formed inside the exhaust pipe. I was able to. Further, the fuel efficiency is improved with the improvement of the exhaust efficiency. Moreover, the silencing effect can be obtained inside the tail pipe 10 by the recess 10A provided on the exhaust gas contact surface of the tail pipe 10.
Further, the chamber 20 includes a cover body 21 that is mounted so as to wrap the outer surface of the exhaust pipe 1, and an internal exhaust pipe 22 that opens inside the cover body 21 and is connected to the exhaust pipe 1. 22 is arranged such that the openings of the diffusion exhaust pipe 22A provided on the exhaust gas inflow side and the compression exhaust pipe 22B provided on the exhaust gas discharge side are separated from each other inside the cover body 21. The number of the diffusion exhaust pipes 22A and the compression exhaust pipes 22B is one or two, and the number of the diffusion exhaust pipes 22A and the compression exhaust pipes 22B can be selected according to the internal combustion engine and the vehicle type. With this configuration, the exhaust system shape does not change significantly from the conventional shape, and not only the type and model of the internal combustion engine, but also a compact system that supports exhaust conditions that vary from engine to exhaust muffler for each vehicle. Mounting is possible.

  As in claim 2, the recess 10 </ b> A formed on the exhaust gas contact surface of the tail pipe 10 is formed on one side or both side surfaces of the fin 11, the inner surface or both inner and outer side surfaces of the rectifying cylinder 13, and the cylinder 12. Since it can be selected from a part or the whole of the inner surface, not only the type and model of the internal combustion engine but also the exhaust conditions that lead to different exhaust mufflers for each vehicle can be handled. In addition, the fuel efficiency can be improved while increasing the torque value.

  As in claim 3, the cylindrical body 12 of the tail pipe 10 has a cylindrical shape with the same diameter in the exhaust direction, a tapered shape with an increased diameter in the exhaust direction, or a reverse tapered shape with a narrowed diameter in the exhaust direction. Thus, the tail pipe 10 corresponding to the type of the internal combustion engine and the difference in the displacement or the size of the vehicle body can be configured.

According to the fourth aspect of the present invention, the diameter of the opening of the diffusion exhaust pipe 22A is formed to be larger than the diameter of the opening of the compression exhaust pipe 22B, and at least a part of each opening faces each other. As a result, the compatibility with each type of tail pipe 10 is improved, and it is possible to cope with more internal combustion engines and vehicle types.

  As described above, according to the present invention, it is possible to cope with the types and types of internal combustion engines such as reciprocating engines, diesel engines, and hybrid engines, and it is possible to increase the power value and torque value and improve the fuel efficiency. In addition, the initial objectives such as the ability to improve the performance up to the silencing effect were achieved.

It is a perspective view which shows one Example of this invention. It is side sectional drawing which shows one Example of the tail pipe of this invention. It is a plane sectional view showing one example of the tail pipe of the present invention. It is a front view which shows one Example of the tail pipe of this invention. The recessed part of this invention is shown, (A) is the side view formed in the member which comprises a fin, (B) is principal part sectional drawing formed in the inner surface of an adjustment cylinder. It is principal part sectional drawing which formed the recessed part in the inner surface of the rectification | straightening cylinder of this invention. (A) thru | or (c) are the sectional side views which showed the example of the tail pipe of this invention. It is a sectional side view which shows one Example of the chamber of this invention. FIG. 8 is a plan sectional view showing the chamber of FIG. 7.

  The basic configuration of the exhaust system of the present invention is a combination of a tail pipe 10 having fins 11 inside and having a dimple-like recess 10A formed on an exhaust gas contact surface, and a chamber 20 adapted to various internal combustion engines and vehicle types. This constitutes an exhaust muffler with high output and low fuel consumption.

  The tail pipe 10 has a cylindrical structure connected to the exhaust port end of the exhaust pipe 1 in the exhaust muffler (see FIG. 1). In the structure of the tail pipe 10, a plurality of fins 11 are arranged in a cylindrical body 12 so as to form a spiral shape in the exhaust gas discharge direction (see FIG. 4).

  Furthermore, the rectification | straightening cylinder 13 is arrange | positioned inside these fins 11 (refer FIG. 4). The rectifying cylinder 13 is disposed in the axial center portion of the tail pipe 10 and is installed in a state surrounded by the fins 11. In the illustrated example, a dimple-like recess 10 </ b> A is formed on the inner surface of the rectifying cylinder 13. Further, the concave portion 10 </ b> A can be formed on both the inner side surface and the outer side surface of the rectifying cylinder 13. Further, although the illustrated straightening cylinder 13 is formed separately from the fins 11, the fins 11 and the straightening cylinder 13 can be integrally formed.

  Three types of cylinders 12 of the tail pipe 10 are prepared according to the vehicle body size, displacement, etc. (see FIG. 7). This figure (a) shows a taper type with an increasing diameter in the exhaust direction, (b) shows a cylindrical type with the same diameter in the exhaust direction, and (c) shows the exhaust direction. The reverse taper type in which the diameter to reach is narrowed is shown. By selecting the tail pipe 10 from the types of these cylinders 12, it is possible to adapt to the body size and displacement of the vehicle, the type of internal combustion engine, the form of the vehicle, and the like.

  In the tail pipe 10 shown in FIG. 2, the cylindrical body 12 constituting the tail pipe 10 adopts a double structure of an outer cylindrical body 12A and an inner cylindrical body 12B. Further, as the inner cylinder 12B, a discharge cylinder 12Bb is connected to the discharge side of the adjustment cylinder 12Ba to constitute an inner cylinder 12B (see FIG. 3). In addition, the structure of the cylinder 12 is not restricted to the example of illustration. For example, the discharge cylinder 12Bb may be omitted and only the adjustment cylinder 12Ba may be used as the inner cylinder 12B, and the cylinder 12 that is not a double structure may be configured.

  One adjustment cylinder 12Ba includes fins 11 therein, and a large number of dimple-like recesses 10A are formed on the inner surface of the adjustment cylinder 12Ba and the exhaust gas contact surface of the fins 11 (see FIGS. 3 and 4). ). The adjustment cylinder 12Ba is a portion corresponding to the cylinder 12 having the basic structure of the tail pipe 10, and has a cylindrical shape having the same diameter in the exhaust direction, a tapered shape having an increased diameter in the exhaust direction, or an exhaust direction. It is appropriately selected from those formed in a reverse taper shape with a narrowed diameter. The adjustment cylinder 12Ba in the illustrated example is formed in a reverse taper shape whose diameter in the exhaust direction is narrowed (see FIGS. 2 and 3).

  The other discharge cylinder 12Bb is formed on the final end side for discharging the exhaust gas (see FIG. 3). The illustrated discharge cylinder 12Bb has a tapered shape with an increasing diameter in the exhaust direction. The design of the discharge cylinder 12Bb can be changed arbitrarily as in the case of the adjustment cylinder 12Ba. The discharge cylinder 12Bb may be omitted and only the adjustment cylinder 12Ba may be configured.

  The position of the recess 10A formed on the surface of the fin 11, the inner side surface of the cylinder 12 and the inner and outer surfaces of the rectifying cylinder 13 is an appropriate selection of the exhaust gas contact surface depending on the type of the cylinder 12 of the tail pipe 10. is there. For example, the illustrated fin 11 has recesses 10 </ b> A formed on both sides (see FIG. 3), but can be formed only on one side of the fin 11.

  The illustrated fin 11 is configured such that a plurality of protrusions are inserted into a notch formed on the inner surface of the cylindrical body 12 and fixed (see FIG. 5A). Further, the fin 11 can be formed integrally with the cylindrical body 12 by a material forming the cylindrical body 12. The concave portion 10A formed on the fin 11 is formed so that one side of the fin 11 is recessed. When the concave portion 10A is formed on both surfaces of the fin 11, the both sides are recessed using the thickness of the fin 11. To do.

  On the other hand, the recess 10 </ b> A formed in the cylinder 12 is formed in a part or the whole inside the cylinder 12. In the illustrated example, the recess 10A is formed in the entire adjustment cylinder 12Ba of the inner cylinder 12B (see FIG. 3). The position of the recess 10A can be limited to the periphery of the fin 11 of the adjustment cylinder 12Ba, or the recess 10A can be formed up to the discharge cylinder 12Bb of the cylinder 12. Further, the recess 10A formed on the inner surface of the adjustment cylinder 12Ba is formed by pressing from the inner surface side of the adjustment cylinder 12Ba (see FIG. 5B), but is not limited to this forming means. It is also possible to form the recess 10A by other forming means.

  In the present invention, the positions of the recesses 10A formed in the cylinder 12 and in the fins 11 and the rectifying cylinder 13 are appropriately determined by selecting the type of the cylinder 12 and the exhaust gas contact surface by selecting the chamber 20 described later. You can choose.

  The chamber 20 is mounted on the internal combustion engine side of the exhaust pipe 1 (see FIG. 1), and includes a cover body 21 surrounding the side surface of the exhaust pipe 1, and an internal exhaust pipe 22 disposed inside the cover body 21. (See FIG. 8). The internal exhaust pipe 22 includes a diffusion exhaust pipe 22A provided on the exhaust gas inflow side and a compression exhaust pipe 22B provided on the exhaust gas discharge side.

  The diffusion exhaust pipe 22A and the compression exhaust pipe 22B are arranged so as to be separated from each other inside the cover body 21, and have a gap between the openings (see FIGS. 8 and 9). The number of the diffusion exhaust pipes 22A and the compression exhaust pipes 22B is one or two side by side. The diffusion exhaust pipe 22A and the compression exhaust pipe 22B are combined in accordance with the type of the internal combustion engine, the exhaust conditions, and the like.

  At this time, the diameter of the opening of the diffusion exhaust pipe 22A is formed so as to be larger than the diameter of the opening of the compression exhaust pipe 22B, and at least a part of each opening is arranged to face each other. Thus, compatibility with each type of the cylindrical body 12 of the tail pipe 10 is improved, and setting of the tail pipe 10 and the chamber 20 is facilitated.

  The illustrated chamber 20 shows a combination of one diffusion exhaust pipe 22A and two compression exhaust pipes 22B (see FIG. 9). The diffusion exhaust pipe 22A is formed in a tapered cylindrical shape in which an opening is widened. In the compression exhaust pipe 22B, the opening and the main body are formed in a cylindrical shape having the same diameter. At this time, it is also possible to form a reverse-taper cylindrical compression exhaust pipe 22B whose opening is narrowed.

  According to the present invention, the exhaust gas is discharged as follows. When the exhaust gas enters the tail pipe 10 from the chamber 20, the exhaust gas that has entered the fin 11 side passes while turning spirally (see FIG. 4). At this time, centrifugal force and inertia act on the exhaust gas, and the exhaust gas is discharged while being compressed on the inner surface of the tail pipe 10. Then, the pressure (atmospheric pressure) of the exhaust gas passing through the rectifying cylinder 13 becomes lower (negative pressure) than the pressure (atmospheric pressure) on the fin 11 side.

  For this reason, the subsequent exhaust gas continuously fed from the chamber 20 into the tail pipe 10 is strongly sucked into the rectifying cylinder 13. Further, the exhaust gas that has passed through the fins 11 and has been discharged outside the tail pipe 10 is rotated and diffused while being spiraled outwardly due to centrifugal force and inertia, and the pressure (in the central portion surrounded by the exhaust gas ( (Atmospheric pressure) decreases. Then, the exhaust gas discharged to the outside of the tail pipe 10 through the rectifying cylinder 13 is smoothly discharged backward so as to pull the yarn with acceleration. As a result, the subsequent exhaust gas continuously supplied from the chamber 20 into the tail pipe 10 can be discharged smoothly, and the exhaust efficiency is improved.

  Next, the example of mounting | wearing of this invention combined with the vehicle is shown. FIG. 1 shows a combination example of a tail pipe 10 and a chamber 20 of a type suitable for a Toyota Prius 30 series HYBRID vehicle. That is, the tail pipe 10 is selected as the reverse taper type (see FIGS. 2 and 3). Further, the position of the concave portion 10A is such that the concave portion 10A is formed on one surface of the fin 11 and the entire adjustment cylinder 12Ba of the inner cylindrical body 12B. On the other hand, the chamber 20 is of a type in which two compression exhaust pipes 22B are combined with one diffusion exhaust pipe 22A (see FIG. 9).

表１は、テスト車両（トヨタ社製プリウス：型式ＤＡＡ−ＺＶＷ３０：エンジン型式２ＺＲ−ＦＸＥ）に、純正マフラーと、比較マフラーとして当出願人が先に開発した市販品のテールパイプ付き排気マフラーと、本発明排気システムとをそれぞれ装着し、各比較マフラーから得られたパワーデータ及びトルクデータの比較を示している。尚、これらの測定器として、シャーシダイナモ（ボッシュ（登録商標）ＦＬＡ２０６）を使用した。

Table 1 shows a test vehicle (Toyota Prius: model DAA-ZVW30: engine model 2ZR-FXE), a genuine muffler, and an exhaust muffler with a tailpipe that was developed by the applicant as a comparative muffler. A comparison of power data and torque data obtained from each comparison muffler with the exhaust system of the present invention attached thereto is shown. As these measuring instruments, chassis dynamo (Bosch (registered trademark) FLA206) was used.

In the table, symbol (1) is a genuine muffler, symbol (2) is a commercially available exhaust pipe with a tail pipe (GD muffler (PAE-31 mass production)), and symbol (3) is an exhaust system of the present invention (GD muffler (silencer). Champa type / dimple / with center, fin, inner)).
(Circle 1), (Circle 2), and (Circle 3) all indicate the data of each comparison muffler, the white circles indicate torque data, and the circles indicate power data.

  As is clear from Table 1, the power (circle 3) and torque (white circle 3) of the exhaust system (3) of the present invention are clearly superior in power value and torque value compared to the genuine muffler (1). Is recognized. Further, the power and torque of the exhaust system (3) of the present invention were found to be significantly higher than the power and torque of the conventional exhaust pipe muffler (2) with tailpipe.

表２は、表１の具体的数値を示している。すなわち、本発明マフラー使用時のパワー（丸３）は149.2psとなり、純正マフラー使用時のパワーの133.4psに比べて＋15.8psものパワーの向上が認められた。一方、エンジントルクでも、純正マフラー（白抜き丸１）が25.8kg/mであるのに対し、本発明（白抜き丸３）では、29.1kg/mとなり、＋3.4 kg/mといった驚異的な向上が認められた。

Table 2 shows specific numerical values of Table 1. In other words, the power (circle 3) when using the muffler of the present invention was 149.2 ps, and an improvement in power of +15.8 ps was recognized compared to the power of 133.4 ps when using a genuine muffler. On the other hand, in the engine torque, the genuine muffler (open circle 1) is 25.8kg / m, but in the present invention (open circle 3), it is 29.1kg / m, which is an amazing +3.4 kg / m. Improvement was observed.

表３は、純正マフラーと、当出願人が先に開発した市販品のテールパイプ付き排気マフラーと、本発明排気システムとをそれぞれ装着したテスト車両（トヨタ社製プリウス：装着タイヤ グッドイヤーＧＴ３ 185/65R15 88S）を実際に走行させて平均燃費を検証する通称、満タン方と称される実験に基づく燃費データを示している。
この満タン方では、同一のコースを全く同じ条件で繰返し走行し、その時の走行距離と給油量で平均燃費を算出するものである。給油量の記録は、給油機による自動停止方法を指定して同一条件下の給油量を記録した。走行距離は、車載のオドメータの記録を採用し、給油時にリセットして次の給油までの距離を記録した。燃費（Km/l）は、走行距離（Km）÷給油量（l）である。
表３に示す燃費データは、走行テストを２０回繰り返し、延べ３，１００kmの実走にて検出された平均燃費データである。
実験の結果、本発明マフラー使用時の平均燃費は２９．８（Km/l）となり、純正マフラー使用時の平均燃費の24.0（Km/l）に比べると、燃費向上率が＋２４．２%となる極めて優れた平均燃費が認められた。

Table 3 shows a test vehicle equipped with a genuine muffler, a commercially available exhaust muffler with tailpipe previously developed by the applicant, and an exhaust system of the present invention (Toyota Prius: tires installed Goodyear GT3 185 / 65R15) 88S) shows actual fuel consumption data based on an experiment called “full tank method”, which verifies the average fuel efficiency by actually driving.
When the tank is full, the same course is repeatedly traveled under exactly the same conditions, and the average fuel consumption is calculated from the travel distance and the amount of fuel supplied at that time. The amount of lubrication was recorded by specifying the automatic stop method by the lubricator and recording the amount of lubrication under the same conditions. The mileage was recorded on an in-vehicle odometer, reset at the time of refueling, and recorded the distance to the next refueling. The fuel consumption (Km / l) is the travel distance (Km) ÷ the amount of oil supply (l).
The fuel consumption data shown in Table 3 is average fuel consumption data detected in actual driving for a total of 3,100 km by repeating the driving test 20 times.
As a result of the experiment, the average fuel consumption when using the muffler of the present invention was 29.8 (Km / l), and the fuel efficiency improvement rate was + 24.2% compared to 24.0 (Km / l) of the average fuel consumption when using a genuine muffler. A very good average fuel economy was observed.

  Although the data in each table shows an example of the present invention, it corresponds to many internal combustion engines and vehicle types by changing the tail pipe 10, changing the chamber 20, the arrangement position of the recess 10A, and combinations thereof. Can do. In addition, in any combination, the power value and the torque value can be increased more than the current level, the fuel efficiency can be improved, and the performance can be improved up to the silencing effect.

  In addition, each structure of this invention is not limited to the example of illustration, For example, it respond | corresponds to many internal combustion engines and vehicle types by the shape change of the tail pipe 10 or the chamber 20, the arrangement position of the recessed part 10A, and these combinations. can do. Further, in addition to the shape of the tail pipe 10 and the configuration of the chamber 20 according to the present invention, the shape and configuration of the fins 11 and the cylindrical body 12, the arrangement position of the recess 10A, and the like are arbitrarily changed without changing the gist of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Exhaust pipe 10 Tail pipe 10A Recess 11 Fin 12 Cylinder 12A Outer cylinder 12B Inner cylinder 12Ba Adjustment cylinder 12Bb Exhaust cylinder 13 Rectification cylinder 20 Chamber 21 Cover body 22 Internal exhaust pipe 22A Diffusion exhaust pipe 22B Compression exhaust pipe

Claims (4)

In a vehicle exhaust muffler comprising a chamber mounted on the internal combustion engine side of the exhaust pipe and a tail pipe mounted on the exhaust side end of the exhaust pipe,
A cylinder that constitutes the tail pipe, a rectifying cylinder that is disposed in the center of the cylinder and through which exhaust gas passes, and a plurality of fins that are arranged between the rectifying cylinder and the cylinder, The fin surrounds the outer surface of the rectifying cylinder and is arranged so that the exhaust gas passes while spirally turning, and a plurality of dimple-like recesses are formed on the exhaust gas contact surface of the tail pipe,
The chamber is composed of a cover body that is mounted so as to wrap the outer surface of the exhaust pipe, and an internal exhaust pipe that opens inside the cover body and is connected to the exhaust pipe, and the internal exhaust pipe is connected to the exhaust gas inflow side. Each opening of the diffusion exhaust pipe provided and the compression exhaust pipe provided on the exhaust gas discharge side is disposed so as to be separated inside the cover body, and the diffusion exhaust pipe and the compression exhaust pipe The exhaust muffler for vehicles is characterized in that the number of the exhaust pipes is one or two, and the number of the exhaust pipes for diffusion and the exhaust pipes for compression can be selected according to the internal combustion engine and the vehicle type .   The recess formed on the exhaust gas contact surface of the tail pipe is formed on one or both side surfaces of the fin, and the inner surface or both inner and outer side surfaces of the rectifying cylinder and a part of the inner surface of the cylinder or The exhaust muffler for a vehicle according to claim 1, wherein the exhaust muffler is formed so as to be selectable from the entire surface.   The cylinder of the tail pipe is formed in a cylindrical shape having the same diameter in the exhaust direction, a tapered shape in which the diameter in the exhaust direction is enlarged, or a reverse tapered shape in which the diameter in the exhaust direction is narrowed. The exhaust muffler for a vehicle according to claim 1, wherein the exhaust muffler is configured to be freely selectable in accordance with an exhaust amount.   The diameter of the opening of the diffusion exhaust pipe is formed so that the diameter is larger than the diameter of the opening of the compression exhaust pipe, and at least a part of each opening is arranged to face each other. The exhaust muffler for vehicles according to 1.

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