JP2008518157A - Vehicle exhaust system - Google Patents

Abstract

The present invention relates to an exhaust device for exhausting a combustion gas used in an internal combustion engine. More specifically, the present invention relates to a exhaust pipe for exhaust gas exhausted from a vehicle. The present invention relates to an exhaust device for a vehicle that discharges to improve fuel efficiency and vehicle torque.
The vehicle exhaust system is formed in a streamlined shape in which a part of a tail pipe 20 provided in an exhaust gas path of a muffler from which exhaust gas is exhausted from an automobile engine is cut out and bent inward. The first and second fixed vanes 30 and 40 facing each other by a predetermined distance are communicated with the first and second fixed vanes 30 and 40, and the first and second fixed vanes 30 and 40 are connected to each other. A circulation outlet 50 having a pipe body 52 welded to the tail pipe 20 so as to be sealed from the outside atmosphere is included.
[Selection] Figure 1

Description

  The present invention relates to an exhaust device for exhausting a combustion gas used in an internal combustion engine, and more specifically, exhausting exhaust gas quickly using a flow of air to a tail pipe of a muffler provided in an exhaust gas exhaust path of a vehicle. The present invention relates to a vehicle exhaust system that improves fuel consumption and vehicle torque.

  As is well known, an automobile using an internal combustion engine is powered by four strokes of suction, compression, explosion, and exhaust.

  The flow of air (intake and exhaust) in the stroke of the engine will be described. When passing through an air cleaner, a throttle valve, etc. in the intake process, air flows into the internal combustion engine without a relatively large resistance.

  However, during the exhaust stroke, combustion gas is exhausted to the tail pipe through an air cleaner and a muffler that use a catalyst, so that a relatively large resistance is generated in the exhaust flow.

  In the process of discharging from the cylinder of the internal combustion engine to the tail pipe, a so-called valve overlap occurs in the exhaust manifold, in which the intake valve and the exhaust valve are instantaneously opened simultaneously during the four strokes of the internal combustion engine. There is a time. In this process, a phenomenon occurs in which the gas discharged again flows into the cylinder, and a vacuum state is instantaneously formed in the exhaust manifold, thereby generating a primary exhaust pressure that hinders exhaust gas discharge.

  In a three-dimensional catalyst device used as an air cleaner, the flow rate of the exhaust gas is remarkably reduced when passing through the fine ventilation holes of the honeycomb-shaped exhaust gas cleaner, and a secondary exhaust pressure is generated. When passing through the partition partitioned into two, the sound is absorbed by the muffler, so if the exhaust gas flows into the muffler, the tertiary exhaust pressure is formed.

In such an exhaust process, the exhaust gas is exhausted at a pressure of 3 to 5 kg / cm ² and a temperature of about 600 ° C., so a muffler is indispensable. The muffler is designed to have a volume of about 15 to 20 times the displacement. Since the exhaust gas cannot be exhausted through the muffler due to air resistance, the engine torque is reduced by 5-10%.

  Therefore, it can be seen that the engine torque and fuel consumption can be improved simply by exhausting exhaust gas more efficiently.

  In order to discharge the exhaust gas more efficiently, various approaches have been proposed.

  Patent Document 1 proposes an automobile exhaust pipe that uses an air flow generated while the automobile is running. In the exhaust pipe, the streamlined main body of the exhaust pipe is coupled to the tail pipe, and a low pressure region is formed by the flow velocity of the air that rapidly passes through the streamlined main body, and the exhaust gas is rapidly sucked into the exhaust pipe by this low pressure. Help exhaust.

  However, the attachment of such a streamlined exhaust device body to an automobile has the disadvantages of structural enlargement and complexity. Furthermore, since a fast air flow cannot be generated while the vehicle is stopped or traveling at a low speed, the narrow exhaust passage obstructs exhaust. Therefore, it is difficult to put the conventional exhaust pipe into practical use.

  According to the tail pipe of the main silencer having the eddy current generating device described in Patent Document 2, the eddy current blade is provided in the middle part of the tail pipe so as to rotate by the exhaust gas, and the eddy current blade rotated by the exhaust gas generates the eddy current. Generate and exhaust the exhaust gas. However, this provides a resistance that hinders the flow of the exhaust gas, which is difficult to put into practical use.

  The automobile exhaust gas exhaust device described in Patent Document 3 is provided with a pipe attached to the end of a tail pipe with bolts, and a large number of blades for vortex flow formation are formed radially on the inner peripheral edge of the pipe, thereby exhausting the exhaust gas to increase the exhaust efficiency. Suggests to improve. However, simply swirling the exhaust gas in this way is not sufficient to exhaust the exhaust gas quickly and smoothly. As a result, in addition to the natural exhaust by the exhaust pressure, the fluid swirl is exhausted. Is only slightly effective to partially help, and thereby the efficiency is very low.

  Moreover, according to the exhaust gas exhaust apparatus using the vortex described in Patent Document 4, the eddy current generating duct having a vane that forms a vortex by injecting external air into the front pipe of the muffler formed in the exhaust gas path. The sub-duct is formed and has a valve in which the opening degree is adjusted in proportion to the opening degree of the throttle valve.

  However, this forms a duct through which the outside air flows into the front pipe of the muffler for removing the exhaust noise, so that the exhaust noise leaks into the duct and the noise is further increased. When accelerating, the valve is widely opened, and the exhaust noise is further increased. Further, since the exhaust gas is discharged into the sub duct having a lower air resistance than the inside of the muffler, there is a problem that the inflowing air receives resistance and is difficult to put into practical use the exhaust gas discharge device.

  According to the conventional exhaust gas discharge device, since the outside air flows into the muffler inflow side, the resistance of the air exists as it is inside the muffler, and as a result, it is not useful for quickly discharging the exhaust gas. Since the outside air adjusting damper that operates in conjunction with the engine throttle valve is operated, the equipment structure and facilities are complicated. Since the outside air flows in and passes through the muffler, there is a disadvantage that foreign matters (dust, sand, etc.) contained in the outside air are deposited inside the muffler and the function of the muffler is lowered.

  In order to solve the above-mentioned problem, the present applicant has previously filed the Korean Patent Application No. 2002-13963 (Patent Document 5) and the automobile exhaust system of Patent Document 6.

  Both the former patent and the latter utility model have a structure in which the outside air generated by running the automobile is collected in a horn-shaped pipe and the exhaust pressure is increased in the exhaust tail pipe to increase the flow velocity.

  That is, the exhaust gas from the exhaust pipe is quickly discharged by increasing the air pressure passing through the small cross-sectional area by collecting external air.

  Such a prior invention has some advantages of increasing the flow rate of exhaust gas and improving torque and fuel consumption, but the effect is insufficient when the vehicle is stopped or traveling at low speed.

  In addition, as shown in Korean Patent Application No. 2004-13721 (Patent Document 7), the present applicant provides fixed exhaust vanes that are notched partially inwardly and bent inward at two locations so that a fast exhaust airflow can be obtained. It is proposed that the outside air that flows backward at the time of overlap is discharged to the vane to increase the torque of the engine.

The present invention has been proposed in order to improve the Patent Document 7 and obtain further improved effects.
Korean Patent Application Publication No. 2000-56951 Korean Patent Application Publication No. 1998-75223 Korean Utility Model No. 99434 Specification Korean Patent No. 257874 Specification Korean Patent Application Publication No. 2003-74951 Korean Utility Model No. 287863 Specification Korean Patent Application Publication No. 2005-45795

  The present invention has been devised in order to increase the efficiency by improving the problems of the prior art as described above and the prior application of the applicant, and its purpose is to discharge through the tail pipe of the muffler. The exhaust gas for a vehicle is capable of forming a jet stream, improving the exhaust gas exhaust velocity by using the venturi phenomenon, circulating the exhausted outside air, and accelerating the exhaust velocity to quickly exhaust the exhaust gas. There is.

  Another object of the present invention is to quickly exhaust the exhaust gas and discharge the exhaust gas flowing backward to the middle part of the tail pipe, thereby preventing the overlap of the exhaust gas again flowing into the engine and increasing the engine torque. An object of the present invention is to provide an exhaust device.

  Still another object of the present invention is to provide a vehicular exhaust that has a solid structure, has a significantly increased durability, can be applied without changing the structure of a conventional muffler, and has excellent compatibility. To provide an apparatus.

  Yet another object of the present invention is to significantly reduce the backflow of exhaust gas and prevent the accumulation of combustion residues such as carbon, thereby extending the life of the engine and increasing the variety of exhaust systems such as expensive smoke purifiers. An object of the present invention is to provide a vehicle exhaust device that can keep clean parts clean.

  According to one aspect of the present invention for achieving the above object, a vehicle exhaust system includes a tail pipe provided in an exhaust path of a muffler through which exhaust gas is exhausted from a vehicle engine. First and second fixed vanes formed in a streamlined shape bent inward and facing each other with a predetermined distance therebetween, and communicated with the first and second fixed vanes, and the first and second fixed vanes A circulation exhaust port having a tubular body welded to the tail pipe so as to be sealed from the outside atmosphere.

  The above and other objects, features and advantages of the present invention will be apparent from the description of the present invention and the accompanying drawings.

  According to the present invention as described in detail above, the exhaust gas discharged through the tail pipe of the muffler from which the exhaust gas is exhausted and the outside air that rapidly flows in, the exhaust speed increases and the exhaust gas is discharged quickly. It is possible to improve the acceleration and climbing ability of the vehicle. The exhaust gas is quickly discharged, and the inflowing outside air is circulated and discharged in the middle of the tail pipe, so that valve overlap in which the exhaust gas flows back to the engine is prevented, and the engine torque increases. Since it has a simple and solid structure, the durability is remarkably increased, and it can be applied without changing the structure of the conventional muffler, so that the compatibility is excellent. Furthermore, the backflow of combustion residues such as exhaust gas and carbon can be prevented to prolong the life of the engine, and various parts such as the exhaust gas purification device of the exhaust system can be maintained clean to extend the life.

  On the other hand, the main description of the present invention is directed to an exhaust system for a vehicle, but is applicable to tail pipes of all mufflers using an internal combustion engine, and various modifications are possible within the scope of the claims. They also belong to the technical scope of the present invention.

  Hereinafter, a vehicle exhaust device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 shows a vehicle exhaust system according to a basic embodiment of the invention.

  In a vehicle exhaust system according to a basic embodiment of the present invention, a part of a tail pipe 20 formed at the rear end of a muffler 10 provided in an exhaust gas path through which exhaust gas is exhausted from a vehicle engine is cut out. The first and second fixed vanes 30 and 40, which are formed in a streamlined shape bent inwardly and are opposed to each other by a predetermined distance, communicate with the first and second fixed vanes 30 and 40, respectively. A circulation exhaust port 50 having a pipe body 52 welded to the tail pipe 20 so as to seal the first and second fixed vanes 30 and 40 from outside air is included.

  The first and second fixed vanes 30 and 40 that are notched and bent inward have a maximum bending angle of 45 ° and have bent ends extending to the position of the center line of the tail pipe 20.

  The operation of the vehicle exhaust system according to the embodiment of the present invention will be described in more detail.

  When the exhaust port 50 is applied to the tail pipe 20 and exhaust gas discharged through a normal process flows into the muffler 10 by driving the engine, noise is absorbed in the expansion chamber of the muffler and then discharged.

  The operation of the applicant's prior application patent shown in FIG. 1 will be described. The combusted exhaust gas has a passing airflow downward due to the folding surface of the first fixed vane 30 and rapidly moves in a narrow cross-sectional area due to the venturi phenomenon. The exhaust gas hitting the folding surface of the second fixed vane 40 moves upward, and a jet stream is formed by the flow velocity. At this time, since the outside air flows into the high pressure side of the inner airflow through the opening of the second fixed vane 40, the inflowing outside air is accelerated and a quick exhaust is realized.

  At this time, a low pressure is generated on the opening side of the first fixed vane 30, and the backflow caused by the backflow phenomenon of the exhaust gas generated when the engine overlaps is exhausted to the atmosphere through the opening of the first fixed vane 30. It acts to remove the backflow gas so as not to interfere with the exhaust of the exhaust system through the muffler side.

  As described above, the exhaust gas passing through the tail pipe 20 passes through the first and second fixed vanes 30 and 40 whose diameter is narrowed, and at the same time the flow velocity becomes rapid due to the venturi phenomenon, and the exhaust gas stream forms a jet stream. Accelerate and exhaust gas is discharged quickly. When the valve overlap of the engine, which occurs repeatedly in a very short time, the reverse airflow is exhausted to the through portion of the first fixed vane 30 as a low pressure area, so the section from the exhaust manifold to the muffler is temporarily negative pressure Forms a condition and does not interfere with fuel intake.

  Here, according to the present invention, the flow of the exhaust gas is increased in the reverse direction and accelerated by the circulation exhaust port 50 surrounding the tail pipe 20 so that the first and second fixed vanes 30 and 40 communicate with each other and are sealed from the outside air. .

  That is, the second fixed vane 40 is formed closer to the outside atmosphere than the first fixed vane 30 located inside the tail pipe 20 from which the exhaust gas is discharged, and the first and second fixed vanes 30 and 40 are formed. The outer diameter of the penetrating portion of the tubular body is formed in a sealed state sealed with the outside air by the tubular body 52 of the circulation exhaust port, and the flow of the exhaust gas is in the opposite direction to the above-mentioned prior application patent.

  Thus, the acceleration of the exhaust gas flow is the same as that of the prior application patent, but the inflow of the outside air and the flow of the exhaust gas are opposite when the engine valve overlaps. The inflow of the outside air is performed through the second fixed vane 40, and the inflowing outside air passes through the first fixed vane 30 by the low pressure region generated by the venturi phenomenon of the first fixed vane 30 so as to accelerate the exhaust gas discharge speed. Act on.

  Therefore, the inflow of outside air is sucked in by the low pressure on the first fixed vane 30 side, and the high-pressure airflow sucked on the second fixed vane 40 side is accelerated and discharged to the first fixed vane side. Therefore, the exhaust gas is discharged more quickly than the conventional prior application invention.

  As a result, the exhaust gas is discharged more quickly through the muffler from which the exhaust gas is discharged. At the same time, when the engine valve overlaps, the backflow of exhaust gas is sucked and discharged through the circulation exhaust port 50, and since the backflow does not interfere with the flow of exhaust gas, it is discharged directly through the tail pipe. Since the exhaust gas is released smoothly, engine torque increases and fuel can be saved. Further, since foreign matters generated during combustion of the fuel remaining in the exhaust system are efficiently discharged, expensive parts of the exhaust system are protected and the life is extended.

  Modified examples of the exhaust device having the above-described structure are shown in FIGS.

  That is, as shown in FIG. 3, the exhaust device includes a tail pipe 20 in which the first and second fixed vanes 30 and 40 are formed, and a pipe body 52 that surrounds the first and second fixed vanes 30 and 40. And a plurality of tail pipes connected in parallel to each other so as to branch to the exhaust end of the muffler. Therefore, the area of the exhaust device is increased, the exhaust gas is discharged smoothly, and the appearance of the exhaust device can be improved.

  As shown in FIG. 4, the exhaust device includes a tail pipe 20 forming first and second fixed vanes 30 and 40, and a pipe body surrounding the first and second fixed vanes, The exhaust end of the muffler 10 is fastened and connected by a clamp 54.

  According to the results of experiments using the exhaust device of the present invention as described above, a pressure gauge was installed on the outlet side of an exhaust manifold of a vehicle having an engine capacity of 1500 cc class, and the pressure of the exhaust was measured. A maximum exhaust pressure of 0.5 (KPs) was measured in the vicinity. On the other hand, when the same experiment was performed without applying the present invention, a maximum exhaust pressure of 1 (KPs) was measured. Therefore, it was confirmed that the maximum exhaust pressure when the exhaust device of the present invention was applied was reduced to ½, and the exhaust gas was discharged efficiently.

  The exhaust device of the present invention may be formed by bending or welding a tube body so that the first and second fixed vanes communicate with each other. The volume inside the circulation exhaust port does not need to be considered, and it is only necessary to configure the flow of air by simply communicating two fixed vanes.

FIG. 1 is a cross-sectional view showing an automobile exhaust system, which is a prior art filed earlier by the present inventor. FIG. 2 is a cross-sectional view showing a vehicle exhaust device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a vehicle exhaust device according to another embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating a vehicle exhaust device according to still another embodiment of the present invention.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 10 ... Muffler, 20 ... Tail pipe, 30 ... 1st fixed vane, 40 ... 2nd fixed vane, 50 ... Circulation exhaust port, 52 ... Pipe body, 54 ... Clamp.

Claims (3)

An exhaust system for a vehicle,
A part of the tail pipe 20 provided in the exhaust gas path of the muffler from which exhaust gas is discharged from the vehicle engine is formed in a streamlined shape that is notched and bent inward, and is opposed to each other with a predetermined distance therebetween. First and second stationary vanes 30 and 40;
Circulation having a tube 52 in communication with the first and second fixed vanes 30 and 40 and welded to the tail pipe 20 to seal the first and second fixed vanes 30 and 40 from the outside atmosphere. A vehicle exhaust system including an exhaust port 50.   A plurality of circulation exhaust ports including a tail pipe 20 in which the first and second fixed vanes 30 and 40 are formed and a pipe body 52 surrounding the first and second fixed vanes 30 and 40 are formed, and the muffler The vehicle exhaust system according to claim 1, comprising a plurality of tail pipes connected in parallel to each other so as to branch to an exhaust end.   The circulation exhaust port 50 includes a tail pipe 20 forming first and second fixed vanes 30 and 40 and a tube body surrounding the first and second fixed vanes 30 and 40, and the exhaust device includes the muffler 10. 2. The vehicle exhaust device according to claim 1, wherein the exhaust end of the vehicle is fastened and coupled to the exhaust end by a clamp.

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