JP2010223043A - Spiral tail for energy saving type exhaust muffler and method for using spiral tail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spiral tail for an energy saving type exhaust muffler suppressing pulsation wave generated when exhaust gas is discharged to atmosphere from an exhaust muffler outlet as much as possible, increasing engine output, and improving fuel economy. <P>SOLUTION: The spiral tail connected to an exhaust end part of the energy saving type exhaust muffler 100 is formed. A tapered tube shape tail pipe 10 of which diameter gradually increases from a connection end part 11 connected to the exhaust end part of the exhaust muffler 100 to a discharge port 13 is formed. A plurality of fins 12 are disposed on an inner circumference surface of the tail pipe 10 under a condition where the fins 12 are twisted in the same direction. When exhaust gas in the exhaust muffler 100 passes through the tail pipe 10, exhaust gas is discharged to atmosphere from the discharge port 13 of which diameter gradually increases while turning in a roughly spiral shape with induced by the fins 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to a spiral tail for an energy-saving exhaust muffler that is attached to a vehicle exhaust muffler end to improve engine efficiency and fuel efficiency, and to improve noise reduction performance, and a method of using the spiral tail. .

  Conventionally, an exhaust system for an internal combustion engine as disclosed in Patent Document 1 has been proposed as an exhaust muffler that enhances engine combustion and enhances engine efficiency.

  According to this exhaust muffler, exhaust gas from the engine is sucked and compressed and expanded in a multistage manner, and the exhaust gas is accelerated and discharged in a spiral shape to promote the combustion action of the internal combustion engine. It is to improve. Therefore, a straight inner pipe is provided in the muffler chamber, and a spiral plate (fin) is provided on the outer periphery of the inner pipe. However, even though this exhaust muffler is configured for the purpose of preventing the diffusion of exhaust sound, it has not been a structure that prevents the generation of pulsating waves when exhaust gas is discharged into the atmosphere.

  Normally, in a 4-cycle engine, a series of motions such as suction-compression-explosion-exhaust are repeated in the cylinder as a reciprocating motion of the piston. At this time, an intake valve and an exhaust valve that open and close in synchronization with the movement of the piston are installed in the cylinder. The high-pressure exhaust gas that has finished the explosion is pushed out from the exhaust valve to the exhaust pipe with an explosion sound. When such piston movement is repeated, exhaust pulsation due to exhaust gas is periodically generated in the exhaust pipe. The high-pressure exhaust gas accompanied by exhaust pulsation is silenced in a chamber (silencer) provided in the middle of the exhaust pipe.

  Originally, the chamber (Expansion Chamber) is an expansion chamber provided in an exhaust pipe in order to increase the charging efficiency of the air-fuel mixture mainly in an exhaust muffler of a two-cycle engine. When the exhaust gas reaches the chamber, the exhaust gas expands vigorously in the chamber. The shock wave generated at the time of expansion is reflected in the chamber, and the air-fuel mixture drawn into the exhaust pipe is pushed back to the cylinder. By utilizing this action in a timely manner, the air-fuel mixture exceeding the cylinder volume is compressed and filled, and as a result, the same effect as that obtained by increasing the displacement is obtained.

  Generally, the exhaust muffler of a 4-cycle engine uses a chamber as a silencer, but the 4-cycle engine also controls the flow of exhaust gas on the exhaust pipe side and blows it to the exhaust pipe side, just like the 2-cycle engine chamber. There is also an energy-saving exhaust muffler with the action of pushing unburned gas back into the cylinder.

  That is, in order to control exhaust pulsation, the energy saving exhaust muffler is provided with a pipe having a different thickness or a chamber (chamber) having an enlarged volume provided in the middle of the exhaust pipe. This energy-saving exhaust muffler can improve engine efficiency and fuel efficiency by adjusting the shock wave generated in the chamber, etc., to reflect in the direction of the exhaust valve of the cylinder and push the unburned gas into the cylinder efficiently. It has been known.

Japanese Utility Model Publication No. 53-23835

  However, in the conventional exhaust muffler, the volume of the high-pressure exhaust gas expands in the atmosphere at a time even when the exhaust gas discharged from the chamber is released into the atmosphere from the outlet of the exhaust muffler. There are waves. This pulsation wave is very small compared to the exhaust pulsation in the chamber, but it is particularly troublesome for an exhaust muffler that improves engine efficiency by effectively using shock waves, such as an energy-saving exhaust muffler. It was.

  That is, if a pulsating wave is generated when it is discharged from the exhaust muffler outlet to the atmosphere, this pulsating wave is transmitted through the exhaust muffler and adversely affects the rhythm of the shock wave reflected in the chamber. Then, the shock wave interferes with the effective timing of pushing unburned gas into the cylinder, making it difficult to improve the engine efficiency and fuel efficiency of the energy-saving exhaust muffler.

  In general, the effective timing at which the shock wave can push unburned gas into the cylinder needs to be adjusted accurately from the length of the exhaust pipe from the cylinder to the chamber, the volume of the chamber, etc., so it is released into the atmosphere. Even a slight pulsating wave generated when the vibration is transmitted to an exhaust pipe, a chamber or the like causes the reflection timing of the shock wave to be out of order.

  Therefore, the adjustment of the energy-saving exhaust muffler so far has had to adjust the timing of the shock wave and the like in a state including the pulsation wave emitted from the exhaust muffler outlet to the atmosphere. For this reason, this adjustment work has become extremely complicated and difficult, and has also been a cause of limiting the improvement efficiency of the engine. For these reasons, it has been desired for an energy-saving exhaust muffler that effectively uses shock waves to prevent the generation of pulsating waves when released into the atmosphere as much as possible.

  On the other hand, in the exhaust muffler described in Patent Document 1, although the configuration in the chamber is considered, not only the action of the shock wave pushing the unburned gas into the cylinder but also when the exhaust muffler is released into the atmosphere from the exhaust muffler outlet. No consideration is given to the generated pulsation wave, and the exhaust muffler of Patent Document 1 is not related to an energy-saving exhaust muffler that improves engine efficiency and fuel efficiency using shock waves.

  Therefore, the present invention was created to solve the above-mentioned problems, and prevents pulsation waves generated when discharged from the exhaust muffler outlet into the atmosphere as much as possible, and shock waves in the chamber push unburned gas into the cylinder. An object of the present invention is to provide a spiral tail for an energy saving exhaust muffler and a method for using the spiral tail that can increase the engine output and improve the fuel efficiency without hindering the operation.

  In order to achieve the above object, the first means in the present invention is the exhaust muffler 100 in the spiral tail connected to the exhaust end of the energy-saving exhaust muffler 100 that effectively uses the shock wave generated with the exhaust gas pulsation. A tapered tubular tail pipe 10 having a gradually increasing diameter from the connecting end 11 connected to the exhaust end of the exhaust pipe 13 to the discharge port 13 is formed, and a plurality of fins 12 are formed on the inner peripheral surface of the tail pipe 10. Are arranged in a twisted state in the same direction, and when the exhaust gas of the exhaust muffler 100 passes through the tail pipe 10, it is guided by the fins 12 and turns from a discharge port 13 that gradually increases in diameter while turning in a substantially spiral shape. It is configured to be discharged to the atmosphere.

  The exhaust muffler 100 of the second means is provided with a chamber 120 in the middle of the exhaust pipe 110, the diameter of the exhaust pipe 110 is changed from a large diameter to a small diameter in the chamber 120, and the large diameter exhaust pipe 111 is changed to a chamber. A large number of diffusion holes 112 are opened in the large-diameter exhaust pipe 111 so that the exhaust gas diffuses into the 120, and the exhaust gas diffused into the chamber 120 is compressed again and flows into the small-diameter exhaust pipe 115. This is an energy-saving exhaust muffler in which a large number of inflow holes 116 are opened in the small-diameter exhaust pipe 115 to effectively use a shock wave generated with exhaust pulsation in the chamber 120.

  The third means forms a tapered tubular tail pipe 10 having a gradually increasing diameter from the connecting end portion 11 connected to the exhaust end portion of the vehicle exhaust muffler 100 to the exhaust port 13. In the method of using a spiral tail in which a plurality of fins 12 are twisted in the same direction on the inner peripheral surface of the exhaust muffler 100, the exhaust muffler 100 saves energy by effectively using a shock wave caused by exhaust gas pulsation. A type exhaust muffler 100 is used, and a spiral tail is connected to an exhaust end of the energy saving exhaust muffler 100 to suppress a pulsation wave when exhaust gas is discharged into the atmosphere.

  The exhaust muffler 100 of the fourth means is provided with a chamber 120 in the middle of the exhaust pipe 110, and spirals at the exhaust end of the energy-saving exhaust muffler 100 that effectively uses the shock wave generated with exhaust pulsation in the chamber 120. Connecting the tail is a means for solving the problem.

  According to the first aspect, when the exhaust gas passes through the tail pipe 10, the exhaust gas is guided to the fins 12, and is exhausted to the atmosphere from the exhaust port 13 that gradually increases in diameter while turning in a substantially spiral shape. Therefore, the exhaust gas is released into the atmosphere in a diffused state while rotating due to centrifugal force and inertia. Further, the exhaust gas passing through the central portion of the tail pipe 10 moves in a state where the pressure is lower than the surroundings and is discharged into the atmosphere. Therefore, when the exhaust gas is released from the exhaust port 13 into the atmosphere, it is possible to suppress pulsation waves generated by the exhaust gas rapidly expanding. As a result, the engine improvement efficiency by the energy-saving exhaust muffler has been improved, and the adjustment work such as the timing of shock waves has become easier.

  In addition, suppressing the pulsating wave caused by the expansion of the exhaust gas also has the effect of attenuating the sound wave energy, so that it also has the effect of improving the silencing performance.

  Further, as in claim 2, as the exhaust muffler 100 to which the spiral tail of the present invention is connected, a chamber 120 is provided in the middle of the exhaust pipe 110, and the diameter of the exhaust pipe 110 is changed from a large diameter to a small diameter in the chamber 120. At the same time, a large number of diffusion holes 112 are opened in the large-diameter exhaust pipe 111 so that the exhaust gas diffuses from the large-diameter exhaust pipe 111 into the chamber 120, and the exhaust gas diffused in the chamber 120 is compressed again. This energy-saving exhaust muffler that makes many use of the inflow holes 116 that flow into the small-diameter exhaust pipe 115 in the small-diameter exhaust pipe 115 and effectively uses the shock wave generated by the exhaust pulsation in the chamber 120 is achieved. Further improve engine efficiency and fuel efficiency without hindering the timing of shock waves of the exhaust muffler 100 Door can be.

  Furthermore, according to the usage method as claimed in claims 3 and 4, the spiral tail of the present invention is connected to the exhaust end of the energy-saving exhaust muffler 100 that effectively uses the shock wave generated by the exhaust gas pulsation, and the exhaust gas is discharged to the atmosphere. By using the method of suppressing the pulsating wave when released into the inside, the reflection efficiency of the shock wave of the energy saving exhaust muffler 100 can be improved, and the engine efficiency and the energy saving effect can be sufficiently extracted.

  Moreover, when adjusting the reflection timing of shock waves of various energy-saving exhaust mufflers 100, it is not necessary to take into account the pulsation wave when exhaust gas is released into the atmosphere. Work can also be facilitated.

It is a side cross section which shows one Example of this invention spiral tail. It is a front view which shows one Example of this invention spiral tail. It is a side cross section which shows the other Example of this invention spiral tail.

  According to the present invention, the pulsation wave generated when the exhaust muffler outlet is released into the atmosphere is suppressed, and the shock wave in the chamber caused by the energy-saving exhaust muffler does not interfere with the action of pushing unburned gas into the cylinder. A spiral tail for an energy-saving exhaust muffler that can increase fuel consumption and improve fuel efficiency has been realized.

  Hereinafter, the present invention will be described based on illustrated examples. The present invention is an energy-saving exhaust muffler spiral tail connected to an exhaust end of an energy-saving exhaust muffler 100 via welding means.

  The configuration of the spiral tail of the present invention includes a tail pipe 10 and fins 12 (see FIG. 1). The tail pipe 10 is a tapered cylindrical metal member whose diameter from the connecting end 11 to the discharge port 13 gradually increases.

  On the other hand, the fin 12 is a member disposed on the inner peripheral surface of the tail pipe 10 and is formed of a metal material (for example, stainless steel), a reinforced resin material, a composite material, or the like as appropriate. Presents. A plurality (for example, 6, 8, 12, etc.) of the fins 12 are arranged in a state twisted in the same direction with respect to the center line of the tail pipe 10 (see FIG. 2). The exhaust gas passing through the tail pipe 10 is guided by the fins 12 and swirls in a substantially spiral shape, and is discharged to the atmosphere while being diffused from the discharge port 13 having a gradually increasing diameter. At this time, the pressure reduction of the exhaust gas that passes through the central portion of the fins 12 promotes the exhaust action and reduces the exhaust resistance inside the exhaust muffler 100, thereby enhancing the energy saving effect.

  The tail pipe 10 is formed of an appropriate metal material such as stainless steel or an appropriate composite material. A cover body 20 is provided outside the tail pipe 10 in the illustrated example so as to improve the appearance. The cover body 20 is appropriately formed of a metal material (for example, stainless steel), an appropriately reinforced resin material, an appropriately composite material, or the like, and can be appropriately decorated on the outer surface. Further, it is possible to use only the tail pipe 10 without providing the cover body 20 itself.

  The energy-saving exhaust muffler 100 in the present invention is a general term for exhaust mufflers of a type that effectively uses a shock wave generated in association with exhaust gas pulsation. In other words, pipes with different thicknesses and a chamber (chamber) with an enlarged volume are provided in the middle of the exhaust pipe to control the flow of exhaust gas on the exhaust pipe side. This is an exhaust muffler 100 having an action of pushing back into the exhaust muffler 100. This energy-saving exhaust muffler 100 improves the engine efficiency and fuel efficiency by adjusting the shock wave generated in the chamber and so on to reflect the direction of the exhaust valve of the cylinder and to push the unburned gas into the cylinder efficiently. It is known that it can be done.

  The exhaust muffler 100 in the illustrated example is provided with a chamber 120 in the middle of the exhaust pipe 110. In the chamber 120, the diameter of the exhaust pipe 110 is changed from a large diameter to a small diameter. That is, the exhaust pipe 110 on the engine side is the large-diameter exhaust pipe 111 and the exhaust pipe 110 on the discharge port side is the small-diameter exhaust pipe 115. The large-diameter exhaust pipe 111 and the small-diameter exhaust pipe 115 are connected to the interior of the chamber 120. It is connected with.

  Furthermore, a large number of diffusion holes 112 are opened in the large-diameter exhaust pipe 111, and the exhaust gas is diffused from the diffusion holes 112 into the chamber 120. On the other hand, a large number of inflow holes 116 are also opened in the small diameter exhaust pipe 115, and the exhaust gas diffused into the chamber 120 is compressed again and flows into the small diameter exhaust pipe 115 from the inflow hole 116. ing. With such a configuration, an energy-saving exhaust muffler that effectively uses a shock wave generated with exhaust pulsation in the chamber 120 is provided.

  In FIG. 1, there is one exhaust pipe 110 in the chamber 120, whereas FIG. 3 shows an embodiment in which there are two exhaust pipes 110 in the chamber 120. Further, as shown in these drawings, the number and size of the exhaust pipes 110 such as the connecting means and the connecting structure between the large diameter exhaust pipe 111 and the small diameter exhaust pipe 115 can be arbitrarily changed according to the engine displacement. It can be done. Furthermore, by arranging a sound absorbing material in the chamber 120, the silencing effect can be enhanced.

  It should be noted that the spiral tail of the present invention can be connected to other types of energy-saving exhaust mufflers in addition to being connected to the illustrated energy-saving exhaust muffler 100. In other words, other types of energy-saving exhaust mufflers also prevent the generation of pulsating waves when discharged to the atmosphere. This energy-saving exhaust muffler can improve engine efficiency, that is, engine efficiency and fuel efficiency. It can be done.

  Further, the specific configuration, shape, dimensions, material of the energy-saving exhaust muffler 100 and the spiral tail of the present invention, the specific mounting means to the exhaust muffler, the specific configuration, shape, dimensions, material, number, arrangement of the fins 12 The position, twisted state and the like are not limited to those shown in the drawings, and can be freely changed in design as appropriate.

  The spiral tail of the present invention is configured as described above. Next, data indicating the use effect will be described.

  Tables 1 to 3 show comparison data between the genuine exhaust muffler and the energy saving exhaust muffler 100 shown in FIG. 1 using the present invention. Table 1 shows the power data comparison, and Table 2 shows the torque data comparison. Further, these results are summarized in the graph of Table 3. In the experiment, each data when using a genuine muffler of a vehicle equipped with a 2000 cc engine and when using the present invention was compared.

  As a result, the engine power when using the present invention was 167.3KW (227.5ps), and an improvement in engine power of + 21.9ps was recognized compared to the engine power of 151.2KW (205.6ps) when using a genuine muffler (Table). 3).

  Also, in the torque data comparison, the engine torque when using the present invention is 404.9Nm (41.3kg-m), which is + 4.8kg-m compared to the engine power of 357.5Nm (36.5kg-m) when using a genuine muffler. There was an improvement in engine torque (Table 3).

  A chassis dynamo (Bosch (registered trademark) FLA206) was used as a measuring instrument for power data comparison and torque data comparison.

  Table 4 shows a comparison of close exhaust noise data between the exhaust muffler 100 of FIG. 1 using the spiral tail of the present invention and a genuine exhaust muffler.

  In this proximity exhaust noise data comparison, a genuine muffler of a vehicle mounted on a 2000 cc engine was compared with proximity exhaust noise data when using the present invention. As a result of the experiment, the proximity exhaust noise when using a genuine muffler was 81 dB, but it was 74 dB when using the present invention, a decrease of -7.0 dB was recognized. A precision sound level meter (Ono Sokki LA4350) was used as a measuring instrument for comparison of the proximity exhaust noise data.

  Furthermore, fuel efficiency performance experiments in the present invention were conducted. In this experiment, fuel efficiency data when a genuine muffler of a vehicle mounted on a 3500 cc engine and the energy saving exhaust muffler 100 shown in FIG.

  The experiment is commonly called “full tank”, where the same course is repeatedly run under exactly the same conditions, and the 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 traveling pattern was set to include three types of traveling conditions in order to confirm the total performance. The travel pattern for this time was set to a total travel distance of about 150 km, including 30 km for general roads, 94 km for highways, and 23 km for mountain roads (up / down). The driving conditions were 3 persons and the air conditioner was set at 25 ° C. When driving on general roads, the traffic conditions must be met according to traffic regulations. When traveling on an expressway, it is basically 100 km / h cruise in accordance with traffic regulations. In addition, if there is a significant change in road conditions or road conditions, the data will be retaken.

  As a result of the fuel consumption performance experiment, the fuel consumption when using the present invention was 12.1 (Km / l), and an improvement of 14% in fuel consumption was recognized compared to 10.6 (Km / l) when using a genuine muffler.

  The spiral tail of the present invention can be used not only for various energy-saving exhaust mufflers but also for exhaust mufflers that are normally used.

DESCRIPTION OF SYMBOLS 10 Tail pipe 11 Connection end part 12 Fin 13 Outlet 20 Cover body 100 Exhaust muffler 110 Exhaust pipe 111 Large diameter exhaust pipe 112 Diffusion hole 115 Small diameter exhaust pipe 116 Inflow hole 120 Chamber

Claims (4)

  In the spiral tail connected to the exhaust end of the energy-saving exhaust muffler that effectively uses the shock wave generated by the exhaust gas pulsation, the diameter from the connection end connected to the exhaust end of the exhaust muffler reaches the exhaust port. A tapered cylindrical tail pipe with gradually increasing diameter is formed, and a plurality of fins are twisted in the same direction on the inner peripheral surface of the tail pipe so that exhaust gas from the exhaust muffler passes through the tail pipe. A spiral tail for an energy-saving exhaust muffler, characterized in that it is configured to be discharged to the atmosphere from a discharge port that gradually increases in diameter while being guided by a fin and turning in a substantially spiral shape.   The exhaust muffler is provided with a chamber in the middle of the exhaust pipe, and the diameter of the exhaust pipe is changed from a large diameter to a small diameter in the chamber, and many exhaust gases are diffused from the large diameter exhaust pipe into the chamber. The diffusion hole is opened in the large-diameter exhaust pipe, and the exhaust gas diffused into the chamber is compressed again and many inflow holes are introduced into the small-diameter exhaust pipe. 2. The spiral tail for an energy-saving exhaust muffler according to claim 1, wherein the spiral tail is an energy-saving exhaust muffler that effectively uses a shock wave generated along with pulsation.   A tapered cylindrical tail pipe having a gradually increasing diameter from the connecting end connected to the exhaust end of the vehicle exhaust muffler to the exhaust port is formed, and a plurality of fins are formed on the inner peripheral surface of the tail pipe. In the method of using a spiral tail arranged in a twisted state in the same direction, the exhaust muffler is an energy-saving exhaust muffler that effectively uses a shock wave generated due to exhaust gas pulsation, and an exhaust end of the energy-saving exhaust muffler A method for using a spiral tail for an energy-saving exhaust muffler, characterized in that a spiral tail is connected to the section to suppress pulsation waves when exhaust gas is discharged into the atmosphere.   The energy saving according to claim 3, wherein the exhaust muffler is provided with a chamber in the middle of an exhaust pipe, and a spiral tail is connected to an exhaust end of an energy saving exhaust muffler that effectively uses a shock wave caused by exhaust pulsation in the chamber. How to use spiral tail for type exhaust muffler.

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