JP2017072087A - Exhaust structure for exhaust muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust structure for an exhaust muffler capable of achieving workable effect by enhancing exhaust efficiency, and capable of coping with types of an internal combustion engine and types of a car.SOLUTION: A tail pipe 10 is attached to an exhaust side end of an exhaust muffler. A fin 11 is radially arranged in the tail pipe 10. The fin 11 discharges exhaust gas in the tail pipe 10 while swirling the exhaust gas. Dimple-like recesses 10A are formed on a part of or entire surface of an exhaust gas contact surface in the tail pipe 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an exhaust structure that is attached to an exhaust side end of an exhaust muffler, and relates to an exhaust structure of an exhaust muffler that can be used in accordance with the type and type of an internal combustion engine while improving engine performance such as power and torque. is there.

  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, by adopting dimple-like irregularities in the exhaust structure of the internal combustion engine, there has been proposed an exhaust structure that improves the power of the internal combustion engine, improves fuel efficiency, or reduces exhaust noise (see Patent Documents 1 to 3). ).

  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 collides with the outer surface of the pipe to form a dimple-shaped 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 flow pipe, the exhaust gas flow resistance is reduced, the back pressure of the engine is lowered, and the engine output and fuel consumption are favorably affected.

  Further, the exhaust system structure of the internal combustion engine described in Patent Document 3 shows an exhaust system structure in which a dimple-like recess is formed on the inner surface of the exhaust pipe by embossing. The concave portion formed on the inner surface of the exhaust pipe increases the wall noise between the sound wave of the exhaust noise and the inner surface of the exhaust pipe, and the sound is also absorbed in the exhaust pipe, thereby reducing the exhaust noise inside the exhaust pipe. That's it.

  On the other hand, as described in Patent Document 4, the applicant attaches to the exhaust side end portion of the exhaust pipe of the exhaust muffler to improve the exhaust efficiency, thereby reducing the output loss and improving the silencing performance. Muffler cutter (hereinafter referred to as tail pipe) patent. This tail pipe is provided with a central flow passage through which exhaust gas passes linearly and an outer peripheral flow passage through which exhaust gas passes while spirally turning by arranging a plurality of fins surrounding the central cylinder.

  Since the exhaust gas passing through the fins of the outer peripheral flow passage is discharged while turning in a substantially spiral shape, centrifugal force acts, and the pressure in the central flow passage portion becomes lower than the pressure in the outer peripheral flow passage portion. Therefore, the exhaust gas fed into the tail pipe is smoothly discharged at a high speed by the outer peripheral flow passage and the central flow passage provided with fins. As a result, exhaust efficiency is improved and engine output loss is reduced.

Japanese Utility Model Publication No. 63-110618 Japanese Utility Model Publication No. 1-174514 Japanese Patent Laid-Open No. 11-324667 Japanese Patent No. 4174789

  In the exhaust structures described in Patent Documents 1 to 3, the back pressure of the engine decreases due to the unevenness formed on the inner surface of the exhaust pipe. As a result, the engine output and fuel consumption are favorably affected, and The resistance is that the exhaust noise inside the exhaust pipe can be reduced.

  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.

  Moreover, with the spread of reciprocating engines and diesel engines, as well as hybrid engines, the current vehicle is rapidly changing the form of the internal combustion engine and the structure of the muffler (silencer). It is expected that effective effects can be obtained in common with various internal combustion engines and muffler (silencer) structures.

  On the other hand, in the exhaust structure described in Patent Document 4, the exhaust gas is made high-speed and smooth by the outer peripheral flow passage provided with a plurality of fins provided in the tail pipe and the central flow passage surrounded by the outer peripheral flow passage. Can be discharged. In addition, since the tail pipe is configured to be mounted on the exhaust side end of the exhaust pipe farthest from the internal combustion engine and the muffler (silencer) in the exhaust structure, it can be mounted on various vehicle mufflers.

  This tailpipe structure has been proven to improve engine performance, and the patented product is still manufactured and sold as a long-selling product, and the effectiveness obtained by mounting it on an actual vehicle is recognized.

  Therefore, the present inventor further improved the engine performance such as power and torque by improving the structure of the tail pipe installed at the exhaust side end portion, and has a more effective than ever obtained by mounting it on an actual vehicle. An object of the present invention is to provide an exhaust structure of an exhaust muffler that can be obtained and can be adapted to the types and types of internal combustion engines such as reciprocating engines, diesel engines, and hybrid engines.

  In order to achieve the above-mentioned object, the first means in the present invention is a vehicle exhaust muffler exhaust structure in which a tail pipe 10 attached to an exhaust side end of the exhaust muffler is provided, and the exhaust gas in the tail pipe 10 is swirled. In addition, a plurality of fins 11 provided so as to be discharged are arranged radially in the tail pipe 10, and a dimple-like recess 10A is formed on a part or the entire surface of the exhaust gas contact surface in the tail pipe 10. is there.

  In the second means, the tail pipe 10 has a central flow passage P1 through which the exhaust gas passes linearly and a plurality of fins 11 surrounding the central flow passage P1 so that the exhaust gas passes in a spiral manner. And the recessed portion 10A is formed on at least one side or both sides of the fin 11.

  In the third means, the tail pipe 10 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. It is a thing.

  According to the first aspect of the present invention, the dimple-shaped recess 10A is formed on the exhaust gas contact surface of the tail pipe 10 attached to the exhaust side end of the exhaust muffler, so that the conventional exhaust pipe has irregularities formed therein. The effective power value and torque value that could not be obtained with the structure could be increased. Further, the fuel efficiency is improved with the improvement of the exhaust efficiency.

  In addition, since an effective effect can be obtained by attaching the tail pipe 10 to the exhaust side end portion of the vehicle muffler, it is easy to combine with the exhaust muffler already used. As a result, it can be used for various exhaust mufflers used in accordance with the type of internal combustion engine such as a reciprocating engine or a hybrid engine, the vehicle type, and the like.

  According to the second aspect, the tail pipe 10 is provided with the central flow passage P1 through which the exhaust gas passes linearly and the plurality of fins 11 surrounding the central flow passage P1, and the exhaust gas passes while turning spirally. Since the recess 10A is formed on at least one surface or both surfaces of the fin 11, the exhaust gas is extremely separated by the central flow passage P1 in which the fin 11 is arranged and the outer flow passage P2. Efficiently discharged. As a result, engine performance is increased and output loss is reduced.

  Furthermore, the power value and torque value improved by the fins 11 having the dimple-like recesses 10A are clearly increased as compared to the tail pipe 10 having the conventional fins 11 having no recesses 10A. The power value and torque value are higher than ever obtained by mounting on an actual vehicle.

  The cylindrical body 12 of the tail pipe 10 as in claim 3 has a cylindrical shape having the same diameter in the exhaust direction, a tapered shape in which the diameter in the exhaust direction is increased, or a reverse tapered shape in which the diameter in the exhaust direction is narrowed. 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.

  As described above, according to the present invention, exhaust gas exhaust efficiency can be improved, and it can be mounted on an actual vehicle to achieve more effectiveness than ever, and the type, vehicle type, and displacement of an internal combustion engine such as a reciprocating engine or a hybrid engine. The initial objectives such as being able to cope with the above were achieved.

It is a perspective view which shows the use condition 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. (A) thru | or (c) are the sectional side views which showed the example of the tail pipe of this invention. It is principal part sectional drawing which shows the chamber part of the general muffler marketed.

  The basic configuration of the present invention is obtained by mounting a dimple-like recess 10A on an exhaust gas contact surface of a tail pipe 10 to be mounted on an exhaust side end of a vehicle exhaust muffler so that it can be mounted on an actual vehicle. The above power value and torque value are extracted.

  An exhaust muffler for a vehicle generally includes a chamber 20 (a silencer) along the exhaust pipe 1, and in the present invention, a tail pipe 10 is attached to an exhaust side end of the exhaust pipe 1 (see FIG. 1). .

  The configuration of the tail pipe 10 is such that a plurality of fins 11 are arranged in the tail pipe 10. The illustrated tail pipe 10 is configured such that a plurality of fins 11 are radially arranged in a cylindrical body 12 in the exhaust gas discharge direction (see FIG. 4). The fin 11 provides a central flow passage P1 through which exhaust gas passes through the center of the cylindrical body 12, and an outer peripheral flow passage P2 through which exhaust gas passes while spirally turning.

  A large number of dimple-like recesses 10A are formed on the exhaust gas contact surface of the tail pipe 10 having such a configuration. The recess 10A is formed on at least one side or both sides of the fin 11. That is, the surface of the fin 11 with which the exhaust gas contacts may be different depending on the number and angle of the fins 11. In that case, the position of the recess 10A formed in the fin 11 is also changed.

  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 may be formed integrally with 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.

  In addition to forming the dimple-shaped recess 10 </ b> A in the fin 11, the recess 10 </ b> A may be formed inside the cylindrical body 12. In this case, the concave portion 10A is formed on a part or the whole of the exhaust gas contact surface of the cylindrical body 12 according to the type of the internal combustion engine and the vehicle type.

  Various types of cylindrical body 12 shown in the drawing are prepared in accordance with the vehicle body size, displacement, etc. (see FIG. 6). 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. Further, the type of the cylindrical body 12 is not limited to the illustrated example, and may be further changed.

  The cylinder 12 shown in FIG. 2 has a double structure of an outer cylinder 12A and an inner cylinder 12B. Further, as an example of the inner cylinder 12B, an inner cylinder 12B in which a discharge cylinder 12Bb is connected to the discharge side of the adjustment cylinder 12Ba is configured (see FIG. 3).

  One adjusting cylinder 12Ba has fins 11 disposed therein (see FIGS. 3 and 4). The adjustment cylinder 12Ba is appropriately selected from 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 taper shape in which the diameter in the exhaust direction is narrowed. Is. 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 concave portion 10A can also be formed in such an inner cylindrical body 12B. The position of the recess 10A can be selected from a part or the whole of the inner cylinder 12B. In the illustrated example, the recess 10A is formed in the entire adjustment cylinder 12Ba of the inner cylinder 12B (see FIG. 3). In addition, it is possible to limit the periphery of the fin 11 of the adjustment cylinder 12Ba, or to form the recess 10A 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.

  The other discharge cylinder 12Bb has a tapered shape in which the diameter of the discharge cylinder 12Bb is increased in the exhaust direction. In the illustrated example, the recess 10A is not formed in the discharge cylinder 12Bb, but the recess 10A can also be formed in the discharge cylinder 12Bb.

  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.

  According to the tail pipe 10 of the present invention, the exhaust gas is discharged as follows. When the exhaust gas enters the tail pipe 10, the exhaust gas that has entered the peripheral flow passage P2 side passes while spirally turning (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 central flow passage P1 is lower (negative pressure) than the pressure (atmospheric pressure) on the outer peripheral flow passage P2 side.

  For this reason, the subsequent exhaust gas continuously fed from the engine into the tail pipe 10 is strongly sucked into the outer peripheral flow passage P2. Further, the exhaust gas discharged from the tail pipe 10 through the central flow passage P1 rotates and diffuses while spirally spreading outside due to the centrifugal force and inertia, and the central portion surrounded by the exhaust gas is diffused. Pressure (atmospheric pressure) decreases. Then, the exhaust gas discharged to the outside of the tail pipe 10 through the central flow passage P1 is smoothly discharged rearward so as to pull the yarn with acceleration. As a result, the subsequent exhaust gas continuously fed from the engine into the tail pipe 10 can be discharged smoothly, and the exhaust efficiency is increased.

表１は、テスト車両（トヨタ社製プリウス）の純正マフラーと、各種比較マフラーと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。比較マフラーは、グラスウールを使用した市販品の排気マフラーの排気側端部にテールパイプを装着したものである（図７参照）。すなわち、市販品の排気マフラーは、カバー体２１内に内部排気管２２を設けたチャンバー２０を備えたものである。そして、各マフラーから得られたパワーデータ及びトルクデータを示している。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 comparison of power data and torque data obtained from a genuine muffler of a test vehicle (Toyota Prius) and various comparison mufflers. The comparative muffler has a tail pipe attached to the exhaust side end of a commercially available exhaust muffler using glass wool (see FIG. 7). That is, a commercially available exhaust muffler includes a chamber 20 in which an internal exhaust pipe 22 is provided in a cover body 21. And the power data and torque data which were obtained from each muffler are shown. As these measuring instruments, chassis dynamo (Bosch (registered trademark) FLA206) was used.

Each code | symbol of Table 1 has shown the following muffler.
Reference numeral (1) denotes a genuine muffler.
The code | symbol (2) shows the commercial muffler equipped with the tail pipe 10 without the fin 11.
The code | symbol (3) shows the commercial muffler which attached the tail pipe 10 with the fin 11. FIG.
The code | symbol (4) shows the muffler which mounted | worn with the tail pipe 10 (The dimple-shaped recessed part 10A has in the fin 11) of this invention to the commercial muffler.
(Circle 1), (Circle 2), and (Circle 3) all indicate data of each muffler, white circle numbers indicate torque data, and circle numbers indicate power data.

As is clear from Table 1, the power value (circle 4) and torque value (open circle 4) of the muffler (4) equipped with the tail pipe of the present invention are extremely superior compared to the genuine muffler (1). Is recognized.
Furthermore, the power and torque of the present invention (4) are clearly more effective than the power and torque of the exhaust pipe muffler with tailpipe (3) provided with the conventional fin 11 without dimples.

表２は、表１の具体的数値を示している。すなわち、本発明テールパイプ使用時のパワーデータ（丸４）は144.8psとなり、純正マフラー使用時のパワーの134.9psに比べて＋9.9psものパワーの向上が認められた。一方、トルクデータでも、純正マフラー（白抜き丸１）が25.5kg/mであるのに対し、本発明（白抜き丸４）では、26.6kg/mとなり、＋1.1 kg/mといった向上が認められた。

Table 2 shows specific numerical values of Table 1. In other words, the power data (circle 4) when using the tail pipe of the present invention was 144.8 ps, and an improvement in power of +9.9 ps was recognized compared to the power of 134.9 ps when using a genuine muffler. On the other hand, in the torque data, the genuine muffler (open circle 1) is 25.5 kg / m, but in the present invention (open circle 4), it is 26.6 kg / m, which is an improvement of +1.1 kg / m. Admitted.

  As described above, the effect of improving the power value and the torque value by forming the concave portion 10A on the exhaust gas contact surface in the tail pipe 10 has been clarified by experiments, but until this reason is scientifically verified. It will take a lot of time. However, the synergistic effect of the exhaust gas passage speed and the change in the airflow generated by the recess 10A under the condition that the exhaust gas passes while spirally swirling around the fins 11 induces these effects. This is considered to be an extremely important factor.

  Each configuration of the present invention is not limited to the illustrated example. For example, in addition to the tail pipe 10 and the shape and configuration of the present invention, the shape and configuration of the fin 11 and the cylindrical body 12, or the arrangement position of the recess 10A These can be arbitrarily changed without changing the gist of the present invention.

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 Discharge cylinder 13 Rectification cylinder 20 Chamber 21 Cover body 22 Internal exhaust pipe

In order to achieve the above-mentioned object, the first means in the present invention is provided with a tail pipe 10 attached to an exhaust side end of an exhaust muffler, and exhaust gas in the tail pipe 10 is exhausted while turning. In the exhaust structure of a vehicle exhaust muffler in which a plurality of fins 11 are arranged radially in the tail pipe 10 and a dimple-shaped recess 10A is formed on a part or the entire surface of the exhaust gas contact surface in the tail pipe 10, The pipe 10 is provided with a central flow passage P1 through which exhaust gas passes linearly and an outer peripheral flow passage P2 through which a plurality of fins 11 surrounding the central flow passage P1 are arranged and the exhaust gas passes while spirally turning. The recess 10A is formed on at least one side or both sides of the fin 11, and the tail pipe 10 has a cylindrical shape with the same diameter in the exhaust direction, or a discharge. Taper shape expanding the diameter leading in the direction, or that the diameter leading to the exhaust direction is formed in an inverted tapered shape Subomu.

The tail pipe 10 includes a central flow passage P1 through which exhaust gas passes linearly and a plurality of fins 11 surrounding the central flow passage P1, and an outer peripheral flow passage P2 through which exhaust gas passes while spirally turning. And the recess 10A is formed on at least one side or both sides of the fin 11, so that the exhaust gas is discharged very efficiently by the central flow passage P1 and the outer peripheral flow passage P2 in which the fin 11 is disposed. The As a result, engine performance is increased and output loss is reduced.

Then, the cylindrical body 12 of the tail pipe 10, the diameter leading to an exhaust direction identical cylindrical or tapered form that the diameter leading to the exhaust direction is enlarged, or diameter leading to the exhaust direction can be formed in an inverted tapered shape Subomu Thus, in addition to selecting these to correspond to the type of the internal combustion engine, it is possible to configure the tail pipe 10 corresponding to the difference in the displacement or the size of the vehicle body.

Claims (3)

  In the exhaust structure of an exhaust muffler for a vehicle, a tail pipe to be attached to the exhaust side end of the exhaust muffler is provided, and a plurality of fins provided so as to exhaust the exhaust gas in the tail pipe while turning are disposed in the tail pipe. An exhaust muffler exhaust structure, wherein the exhaust muffler is arranged radially and has a dimple-like recess formed in a part or the entire exhaust gas contact surface in the tail pipe.   The tail pipe is provided with a central flow passage through which exhaust gas passes linearly and an outer peripheral flow passage through which exhaust gas passes spirally by arranging a plurality of fins surrounding the central flow passage, The exhaust structure of an exhaust muffler according to claim 1, wherein the recess is formed on at least one side or both sides of the fin.   2. The exhaust according to claim 1, wherein the tail pipe is formed in a cylindrical shape having the same diameter in the exhaust direction, a tapered shape in which a diameter in the exhaust direction is enlarged, or a reverse taper shape in which a diameter in the exhaust direction is narrowed. Exhaust structure of muffler.

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