HK1109439B - Exhaust gas-discharging device of vehicle - Google Patents

Description

Exhaust gas discharge device for vehicle

Technical Field

The present invention relates to an exhaust gas-discharging device for discharging burned gas used in an internal combustion engine, and more particularly, to an exhaust gas-discharging device for discharging burned gas to a muffler tail pipe provided on an exhaust gas discharge path of a vehicle using a gas flow to improve fuel efficiency and vehicle torque.

Background

It is known that a vehicle using an internal combustion engine obtains driving power through a four-stroke cycle consisting of an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke.

Due to the airflow action during the engine strokes (intake stroke and exhaust stroke), air is introduced into the internal combustion engine without a relatively large resistance during the intake stroke as it passes through an air cleaner, a throttle valve, and the like.

However, during the exhaust stroke, since the burned gas is exhausted to the tail pipe through the air cleaner using the catalyst and the muffler, a relatively large resistance occurs in the flow of the burned gas.

During the exhaust from the engine block to the tail pipe, in the exhaust manifold, there occurs a phenomenon that the intake valve and the exhaust valve are simultaneously opened immediately during the four strokes of the internal combustion engine, that is, a timing at which so-called "valve overlap" occurs. During this process, there occurs a phenomenon that the exhaust gas is reintroduced into the cylinder, so that the exhaust manifold is instantly vacuumed, resulting in the formation of a first exhaust pressure, interfering with the discharge of the exhaust gas.

Further, in a three-way catalytic converter as an air purifier, the flow speed of exhaust gas is so remarkably reduced that a second exhaust gas pressure is generated when the exhaust gas passes through fine pores of a HoneyCom type exhaust gas purifier, while a third exhaust gas pressure is generated when the exhaust gas passes through a partition for dividing a muffler into a plurality of compartments, so that sound is absorbed by the muffler. During this exhaust process, a muffler is necessary since the exhaust gas is discharged at a pressure of 3 to 5 kg/cm and at about 600 degrees celsius. The muffler is designed to be fifteen to twenty times the volume of the engine. Engine torque is reduced by five to ten percent due to air resistance resulting in exhaust gas not being discharged through the muffler.

Thus, it can be understood that the torque and fuel efficiency of the engine can be improved only by more effectively discharging exhaust gas.

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

Korean patent application laid-open No. 2000-56951 proposes a vehicle discharge pipe using an air flow generated when a vehicle is driven. In the exhaust pipe, a streamlined body of the exhaust pipe is combined with a tail pipe so that a low pressure region is formed by an air flow rapidly passing through the streamlined body, and exhaust gas is rapidly sucked into the exhaust pipe due to the low pressure to assist the exhaust gas discharge.

However, the conventional vehicle drain container is too large and complicated to be mounted to a vehicle. Further, since an air flow cannot be generated when the vehicle is stopped or running at a low speed, the narrow exhaust passage rather interferes with exhaust emission. Thus, it is difficult to put the conventional discharge pipe into practical use.

According to the tail pipe of the main muffler with a vortex generator disclosed in korean patent application No. 1998-. However, it is practically difficult to use this structure because it instead creates resistance and disturbs the exhaust flow.

According to the exhaust gas discharge device for a vehicle disclosed in korean registered utility model No. 99434, a pipe is fixed to the end of a tail pipe by screws, and a plurality of blades for generating a vortex are formed on the inner circumference of the pipe in a radial direction, so that exhaust gas is converted into a vortex to improve discharge efficiency. However, the structure of swirling the exhaust gas is not sufficient to discharge the exhaust gas rapidly and smoothly, its effect is not significant due to the discharge pressure, and it is very inefficient because it only partially assists the formation of the discharge swirl in addition to the natural discharge.

Further, according to the exhaust gas discharge device using a vortex disclosed in korean patent No. 257874, a vortex generating duct is provided on a front duct of a muffler installed on an exhaust gas path and includes a vane for introducing external air and forming a vortex, and a sub-duct includes a valve opening degree in proportion to an opening degree of a throttle valve.

However, since the duct through which the external air is introduced is installed on the front duct of the muffler removing the exhaust noise, the exhaust noise is formed on the duct, and thus the noise is large. The valve opening degree is large when accelerating, and thus exhaust noise is large. In addition, since the exhaust gas is discharged to the branch duct having lower air resistance than the inside of the muffler, the introduced air meets the resistance, so that the exhaust gas discharge device is difficult to be put to practical use.

According to the conventional exhaust gas-discharging device, since the external air is introduced into the inlet of the muffler, air resistance remains in the muffler, and this effect is not useful for rapidly discharging the exhaust gas. The structure of the exhaust device and its manufacturing equipment are complicated due to the provision of the outside air adjusting damper that operates in cooperation with the engine throttle valve. Since the external air is introduced into and passes through the muffler, foreign substances such as dust, sand, etc. contained in the external air are collected in the muffler, so that the muffler performance is degraded.

The applicant of the present invention has filed korean patent application laid-open No. KR-2003-.

All of the former patent application and the latter utility model application disclose a muffler for a vehicle in which outside air generated when the vehicle is running is compressed through a trumpet-shaped pipe to increase the exhaust pressure of a discharge tail pipe, so that the flow rate is increased.

In other words, the outside air is concentrated to increase the pressure of the air passing through the smaller cross-section, so that the exhaust gas is rapidly discharged in the exhaust pipe.

These conventional devices have some advantages of increasing the flow rate of exhaust gas to improve torque and fuel efficiency, but are of little effect when the vehicle is stopped or running at a low speed.

Further, as disclosed in korean patent application laid-open No. KR-2005-0045795, the present applicant has proposed that two stationary vanes are cut off from a bent portion toward the tailpipe side and spaced apart from each other, thereby generating a rapid exhaust flow, and the outside air reintroduced during the valve overlap is discharged to the vanes to increase the torque of the engine.

The present invention proposes to improve the device disclosed in korean patent application laid-open publication No. KR-2005-0045795 to obtain an improved effect.

Disclosure of Invention

Technical problem

Accordingly, the present invention has been made keeping in mind the above problems and improving the related devices and their efficiencies filed by the applicant of the present invention, and an object of the present invention is to provide an exhaust gas discharge device for a vehicle, in which exhaust gas discharged through a tail pipe of a muffler is jetted, the discharge speed of the exhaust gas is increased using a venturi phenomenon, and introduced external air is circulated and discharged to increase the discharge speed, so that the exhaust gas is rapidly discharged.

It is another object of the present invention to provide an exhaust gas-discharging device for a vehicle for rapidly discharging exhaust gas and discharging the reintroduction exhaust gas to the middle section of a tail pipe, thereby preventing valve overlap, at which the exhaust gas is reintroduced into an engine, while the torque of the engine is increased.

It is still another object of the present invention to provide an exhaust gas-discharging device for a vehicle, which has a robust structure to remarkably increase durability and has good compatibility when applied to an engine without changing the structure of a conventional muffler.

It is still another object of the present invention to provide an exhaust gas-discharging device for a vehicle, in which the device serves to significantly reduce the reintroduction of exhaust gas to prevent post-combustion materials such as carbon from being accumulated therein, so that the life of an engine is extended while various elements of an exhaust system such as an expensive exhaust gas purifier can be kept clean.

Technical scheme

In accordance with one aspect of the present invention, the above and other aspects can be accomplished by the provision of an exhaust gas discharge apparatus for a vehicle, wherein the apparatus comprises: first and second fixed vanes formed in a streamline shape by cutting side portions of a tail pipe provided on an exhaust gas discharge path of a muffler through which exhaust gas discharged from a vehicle engine passes, the fixed vanes being bent inward and spaced apart from each other to face each other; and a circulating exhaust gas discharge device having a pipe body welded to the tail pipe and communicating with the first and second stationary blades to seal the first and second stationary blades from the external air.

Advantageous effects

As described above, according to the exhaust gas-discharging device of the present invention, exhaust gas is discharged through the muffler tail pipe, in which exhaust gas is discharged, and since the exhaust gas discharging speed is increased while the external air is rapidly introduced, and thus exhaust gas is rapidly discharged, the vehicle is effectively accelerated while the climbing performance of the vehicle is improved. Since exhaust gas is rapidly discharged and the introduced external air is circulated in the middle section of the tail pipe and discharged to the outside, valve overlap, which causes exhaust gas to be reintroduced into the engine, is prevented and the torque of the engine is increased. The structure is simple and strong, the durability thereof is remarkably increased, and the muffler can be applied to a vehicle without changing the structure of the conventional muffler, so that the compatibility is good. In addition, exhaust gas and pollutants such as carbon are prevented from being reintroduced, so that the life of the engine is extended while various components such as an exhaust system exhaust purifier are kept clean and their life is extended.

Although the present invention has been described with respect to an exhaust gas-discharging device for a vehicle, it will be understood by those skilled in the art that the exhaust gas-discharging device of the present invention can be used for any muffler of an internal combustion engine, while being easily modified within the scope of the present invention disclosed in the appended claims.

Drawings

The features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a sectional view showing a vehicular exhaust gas-discharging device as a conventional technique filed by the inventor of the present application;

fig. 2 is a sectional view showing an exhaust gas-discharging device for a vehicle according to a preferred embodiment of the present invention;

fig. 3 is a sectional view showing an exhaust gas-discharging device for a vehicle according to another preferred embodiment of the present invention; and

fig. 4 is a sectional view showing an exhaust gas-discharging device for a vehicle according to still another preferred embodiment of the present invention.

Best mode for carrying out the invention

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

Fig. 2 shows an exhaust gas-discharging device of a vehicle according to a substantially preferred embodiment of the present invention.

The exhaust gas-discharging device for a vehicle according to the basic preferred embodiment of the present invention includes first and second fixed vanes 30, 40 and a circulation exhaust gas-discharging device 50. Forming streamline-shaped fixed vanes 30, 40 by cutting off the side of a tail pipe 20 formed on the rear end of a conventional muffler 10, wherein the muffler 10 is disposed on an exhaust gas discharge path through which exhaust gas discharged from a vehicle engine passes, the fixed vanes 30, 40 being bent inward and spaced apart from each other to face each other; and the circulation exhaust gas-discharging device 50 has a pipe body 52 welded to the tail pipe and communicating with the first and second stationary blades 30, 40 to seal the first and second stationary blades 30, 40 from the external air.

The first and second fixed vanes 30, 40 cut to be inwardly curved have maximum bending angles of 45 degrees, respectively, and have curved end portions extending to the center line of the tail pipe 20.

The operation of the exhaust gas-discharging device according to the preferred embodiment of the present invention will be described in detail.

When the circulation exhaust gas-discharging device 50 is used for the tail pipe 20, exhaust gas discharged through a general process when the engine is started is fed into the muffler 10 and discharged to the outside after noise is absorbed in the muffler expansion chamber.

According to the operation of the former korean patent application filed by the applicant of the present invention as shown in fig. 1, the exhaust gas flows downward due to the curved surface of the first fixed vane 30 and rapidly passes through a narrow cross-section due to the venturi phenomenon. The exhaust gas collides with the curved surface of the second fixed vane 40 to flow upward, and a jet is generated due to the flow velocity of the exhaust gas. At this time, the external air is introduced to the high pressure side of the internal air flow through the opening of the second fixed vane 40, so that the introduced external air is accelerated to perform rapid exhaust.

At this time, the pressure is decreased at the opening of the first fixed vane 30, and the backflow caused by the exhaust gas backflow phenomenon generated during the engine valve overlap is discharged to the outside through the opening of the first fixed vane 30, so that the backflow of the exhaust gas is removed to prevent the backflow from interfering with the exhaust performance of the exhaust system through the muffler.

As described above, the exhaust gas passing through the tail pipe 20 passes through the first and second fixed vanes 30, 40, in which the diameters of the vanes become narrower, and the flow velocity rapidly becomes larger due to the venturi phenomenon at the same time, the flow of the exhaust gas forms a jet flow and is accelerated, so that the exhaust gas is rapidly discharged. During the repeated causing of the engine valve overlap in a very short time, the area from the exhaust manifold to the muffler is immediately below the negative pressure due to the back flow discharged to the opening which is the low pressure area of the first fixed vane 30, so that the fuel inlet does not interfere.

Here, in the present invention, since the circulation exhaust gas discharge means serves to communicate the first and second fixed vanes 30, 40 with each other and cover the tail pipe 20 to be sealed from the external air, the exhaust gas flow is increased and accelerated, on the contrary.

In other words, since the second fixed vane 40 is closer to the external environment than the first fixed vane 30 positioned inside the tail pipe 20 through which the exhaust gas is discharged, and since the pipe body in which the first and second fixed vanes 30, 40 are formed is sealed from the external environment by the circulating exhaust gas-discharging device pipe body 52, the exhaust gas flows in the opposite direction, as disclosed in the above-mentioned korean patent application.

In this way, the acceleration of the exhaust gas flow is the same as in the above-described korean patent application, however, the introduction of the external air and the exhaust gas flow are reversed during the overlap of the engine valves. The introduction of the external air is performed through the second fixed vane 40, and the introduced external air passes through the first fixed vane 30 due to a low pressure region generated by the venturi phenomenon and serves to accelerate the discharge speed of the exhaust gas.

Accordingly, since a push-pull reaction occurs, that is, external air is introduced due to a lower pressure of the first fixed vane 30, so that a high-pressure air flow introduced through the second fixed vane 40 is accelerated toward the first fixed vane and discharged outward, exhaust gas is discharged more rapidly than in the case of the above-mentioned korean patent application publication.

Therefore, the exhaust gas is more rapidly discharged through the muffler in which the exhaust gas is discharged. Simultaneously, during the engine valve overlap, in the circulation exhaust gas discharge device 50, the backflow of exhaust gas is introduced and discharged, and directly discharged to the outside of the tail pipe, so that the backflow does not interfere with the flow of exhaust gas. Since exhaust gas is smoothly discharged, torque of the engine is increased and fuel is also saved. In addition, foreign substances generated during combustion of fuel, which are stagnant in the exhaust system, are effectively discharged, so that expensive elements of the exhaust system are protected, and their life spans are extended.

Invention mouldFormula (II)

The exhaust gas-discharging device constructed as described above may be modified as shown in fig. 3 and 4. In other words, as shown in fig. 3, the exhaust gas-discharging device includes a plurality of tail pipes in which the circulation exhaust gas-discharging device 50 includes the tail pipe 20 in which the above-described first and second fixed vanes 30, 40 are formed, and the duct body 52 for surrounding the fixed vanes 30, 40, respectively, and is connected to the exhaust side of the muffler in a mutually parallel relationship. Thus, the cross-section of the exhaust gas-discharging device is increased, so that the exhaust gas is smoothly discharged, and the external shape of the exhaust gas-discharging device can be improved.

As shown in fig. 4, the exhaust gas-discharging device includes a circulation exhaust gas-discharging device 50, wherein the circulation exhaust gas-discharging device 50 includes a tail pipe 20 in which first and second fixed vanes 30, 40 are formed and a pipe body 52 for surrounding the fixed vanes 30, 40, and is coupled with an exhaust side of the muffler 10 by a clamp 54. The exhaust gas-discharging device is easily coupled to the end of a conventional exhaust gas-discharging device for a vehicle.

According to the test of the circulation exhaust gas-discharging device of the present invention applied to a vehicle, when a pressure gauge was installed at the outlet of the exhaust manifold of a vehicle having an engine capacity of about 1500 cubic centimeters and the exhaust gas pressure was measured, the maximum exhaust gas pressure was measured at about 2,500 rpm as 0.5 KPs. Meanwhile, when the same test was performed without applying the circulation exhaust gas discharge device, the measured maximum exhaust pressure was 1 KPs. Thus, the maximum exhaust pressure is reduced by half when the circulation exhaust gas-discharging device of the present invention is applied, and it is thus certain that the exhaust gas has been effectively discharged.

The circulation exhaust gas discharge apparatus of the present invention may be designed such that the duct body is bonded or welded to communicate with the first and second stationary blades. The internal volume of the circulating exhaust gas-discharging device is not significantly considered, but is sufficient to communicate the two fixed vanes with each other, resulting in the formation of an air flow.

Claims (3)

1. An exhaust gas discharge device for a vehicle, comprising:

first and second fixed vanes (30 and 40) formed in a streamline shape by cutting the side of a tail pipe (20), wherein the tail pipe (20) is disposed on an exhaust gas discharge path of a muffler (10) through which exhaust gas discharged from a vehicle engine passes, the fixed vanes (30 and 40) being bent inward and spaced apart from each other to face each other; and

a circulating exhaust gas discharge device (50) having a duct body (52) welded to the tail pipe and communicating with the first and second stationary vanes (30 and 40) to seal the first and second stationary vanes (30 and 40) from the outside air.

2. The vehicle exhaust gas-discharging device according to claim 1, further comprising a plurality of tail pipes, wherein the circulating exhaust gas-discharging devices (50) respectively comprise: a tail pipe (20) in which first and second fixed vanes (30 and 40) are formed, and a duct body (52) for surrounding the fixed vanes (30 and 40) and connected to the exhaust side of the muffler in a mutually parallel relationship.

3. The vehicle exhaust gas discharge device according to claim 1, wherein the circulation exhaust gas discharge device (50) includes a tail pipe (20) in which the first and second fixed vanes (30 and 40) are formed and a pipe body (52) for surrounding the fixed vanes (30 and 40), and the circulation exhaust gas discharge device (50) is coupled with the exhaust side of the muffler (10) by a clamp (54).