KR102104213B1 - Vehicle exhaust gas ejecting apparatus with fuel efficiency improvement and noise reduction function - Google Patents

Abstract

The present invention relates to a vehicle exhaust gas emission device having output and fuel efficiency improvement and noise reduction functions, wherein turbulent exhaust gas emitted from vehicle exhaust is converted into a laminar flow to increase a gas flow rate, thereby improving the amount of mixed fuel entering a vehicle′s intake manifold and improving exhaust efficiency of the exhaust gas by using the shape as well as removing harmful substances from the exhaust gas. In addition, the vehicle exhaust gas emission device suppresses a back-flow generated when the exhaust gas is discharged into the atmosphere to improve an exhaust gas emission rate, and suppresses occurrence of noise by removing a vacuum phenomenon.

Description

Vehicle exhaust gas ejecting apparatus with fuel efficiency improvement and noise reduction function

The present invention relates to a vehicle exhaust gas discharge device having an output and fuel efficiency improvement and noise reduction function, more specifically, by increasing the flow rate of the exhaust gas and mixing it with external air to convert the turbulent exhaust gas into laminar flow. The present invention relates to an exhaust gas emission device for a vehicle capable of inducing rapid emission of exhaust gas and preventing back-flow of exhaust gas, thereby inducing rapid emission of exhaust gas and suppressing noise generation.

In general, the exhaust gas emitted from the engine of the vehicle is guided to the rear side of the vehicle through exhaust systems such as exhaust manifold, exhaust pipe, and muffler, and exhausted to the atmosphere. In this process, the exhaust gas is exhausted to the state of high temperature and high pressure. Will pass.

In order to increase the fuel efficiency of the vehicle and enhance the output, control of hop and exhaust is very important. First, when looking at the intake, increase the amount of air drawn into the engine, increase the air intake speed, or form a vortex. This intake treatment more effectively mixes fuel and air inside the cylinder to increase explosive power and reduce incomplete combustion, so that unnecessary foreign matter is not accumulated in the engine.

On the other hand, when looking at the intake, in general, high-temperature and high-pressure exhaust gas may generate enormous noise when directly discharged to the outside, so it is discharged through a much longer path than the intake path, and the exhaust gas is discharged from the exhaust pipe of the cylinder. Because it is continuously pushed and moved in the direction of the tail pipe, resistance occurs when exhaust gas is discharged from the exhaust pipe, which causes a decrease in vehicle output. Therefore, research is needed to increase the efficiency of discharging exhaust gas to the outside.

As a prior art related to such exhaust gas emission, Patent Publication No. 10-2013-0117007 (reference) has been proposed. This relates to an exhaust structure for a vehicle using air flow, comprising: a connecting pipe connected from the exhaust manifold; And a joint portion spaced at a predetermined distance from the outer circumferential surface of the connecting pipe to surround the end portion, a mixing portion extending from the joint portion, and formed of a tube having a smaller diameter than the joining portion, and extending from the mixing portion to have a larger diameter than the mixing portion. It includes a discharge pipe formed integrally with the discharge portion formed by a pipe, characterized in that the inlet space is formed through which the outside air flows through the space between the connection pipe and the discharge pipe.

However, in the vehicle exhaust structure proposed in the reference, a connecting pipe connected from the exhaust manifold is partially inserted at a predetermined interval to form a discharge pipe that extends, and external air flows into a space spaced between the connecting pipe and the discharge pipe. It is formed as an inflow space, and external air and exhaust gas are mixed to form a vortex while moving, but the inner diameter of the connecting pipe is the same, and the inner diameter of the mixing space is larger than the inner diameter of these connecting pipes, and then the exhaust gas passes through the connecting pipe. Rather, not only the flow rate is reduced, but also the edge of the exhaust gas finally discharged due to the discharge part formed of a tube having a larger diameter than the mixing part, so that there is a problem that rapid exhaust of the exhaust gas is prevented.

Reference 1: Published Patent No. 10-2013-0117007

Therefore, the present invention for solving the problems of the prior art increases fuel flow by increasing the flow rate of exhaust gas and mixing it with external air to convert turbulent exhaust gas into laminar flow to induce rapid exhaust gas emission, and An object of the present invention is to provide a vehicle exhaust gas emission device capable of reducing noise.

In addition, the present invention can reduce the temperature of the exhaust gas to convert turbulent exhaust gas into laminar flow to induce rapid exhaust gas emission and prevent back-flow from occurring at the edge of the final exhaust gas. Accordingly, an object of the present invention is to provide a vehicle exhaust gas emission device that can induce rapid emission of exhaust gas and suppress noise generation.

The present invention to solve this technical problem;

An exhaust pipe in which exhaust gas moves from front to rear, and an inner tube provided on the rear side of the exhaust pipe 10 to allow external air to enter the turbulent exhaust gas flowing from the exhaust pipe and convert and discharge it into laminar flow. , It is provided to cover the inner pipe spaced apart, and when the outside air enters, it bypasses the exhaust gas at the end to prevent the backflow of exhaust gas. Device.

At this time, the exhaust pipe is made of aluminum, but a plurality of interiors provided with a first cylindrical portion in which a first gas flow path through which exhaust gas moves from front to rear and an equal interval in the longitudinal direction on the inner circumferential surface of the first cylindrical portion Cooling fins, a plurality of external cooling fins provided at equal intervals in the longitudinal direction on the outer circumferential surface of the first cylindrical portion, and extending to the rear end of the first cylindrical portion and shrinking toward the central axis toward the rear, ; The inner tube is axially oriented toward the central axis toward the rear so as to form an air guide path that surrounds the axial pipe portion of the exhaust pipe spaced apart and guides external air to flow into the front most of the second gas flow path, so that the axial pipe portion of the exhaust pipe is spaced apart A first cylindrical air guide portion and a second cylindrical portion extending at a rear end of the first outdoor air guide portion and forming a second gas flow path through which exhaust gas discharged through an exhaust hole of the shaft pipe portion of the exhaust pipe moves from front to rear; It is provided to extend to the rear end of the second cylindrical portion, but consists of a first expanding portion extending in the circumferential direction toward the rear side; The outer tube is axially piped toward the central axis toward the rear to surround the first outer air guide portion of the inner tube spaced apart from the second air guide portion to form a first bypass path for moving the external air from front to rear, A third cylindrical portion extending to the rear end of the second outside air guide portion and spaced apart from the second cylindrical portion of the inner tube to form a second bypass path through which external air moves from front to rear, and to the rear end of the third cylindrical portion. It is provided to be extended, but extends in the circumferential direction toward the rear to cover the first expansion portion of the inner tube to be spaced apart to form a third bypass path through which external air moves from front to rear to discharge exhaust gas from the second gas flow path. It characterized in that it consists of a second expansion pipe to prevent backflow during the time.

In addition, the external air flowing in from the front of the outer tube is characterized in that sequentially passing through the first to third bypass passages of the second air guide portion, the second cylindrical portion and the second expansion pipe portion.

In addition, the inner circumferential surface of the exhaust pipe is characterized in that a concave groove capable of inducing air flow smoothly by reducing frictional stress is formed at equal intervals.

In addition, in the center of the first gas flow path of the exhaust pipe, a streamlined induction port is fixed in a central axis direction by a support member, and the streamlined induction port is characterized in that the outer diameter decreases from the front to the rear.

In addition, the inner peripheral surface of the second gas flow path of the inner tube is characterized in that it is further provided with a coil-type induction port made of a coil spring shape to switch the direction of the exhaust gas.

In addition, the inner circumferential surface of the second gas flow path is characterized in that a concave groove capable of guiding air flow smoothly by reducing frictional stress during exhaust gas movement is maintained at equal intervals.

In addition, a guide blade having an end protruding inward and forward is formed in the first half of the first cylindrical portion of the exhaust pipe so that air guided to the outside of the first cylindrical portion through the through hole is formed outside the first cylindrical portion. It characterized in that the air guide path and a fourth bypass path leading to the first bypass path is formed.

At this time, the guide vane and the fourth bypass path are characterized in that a plurality of the inner and outer sides of the first cylindrical portion are arranged at equal intervals.

The exhaust gas emission device for a vehicle having an output, fuel efficiency improvement, and noise reduction function according to the present invention converts turbulent exhaust gas discharged from a vehicle exhaust such as a bus or truck into laminar flow to increase exhaust gas flow rate. It has the effect of improving the amount of mixed fuel entering the intake manifold and improving the exhaust efficiency of the exhaust gas by using this shape as well as improving fuel efficiency and improving harmful substances in the exhaust gas.

In addition, according to the present invention, by suppressing the back-flow generated when the exhaust gas moving to the rear is discharged to the atmosphere by bypassing the external air, the speed of the exhaust gas is discharged, and noise is generated by extinguishing the vacuum phenomenon. It also has an inhibitory effect.

1 is an external view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a first embodiment of the present invention.
FIG. 2 is a partially cut-away perspective view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a first embodiment of the present invention.
3 is an exploded perspective view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a first embodiment of the present invention.
4 is a cross-sectional view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a first embodiment of the present invention.
5 is a partially cut-away perspective view illustrating a vehicle exhaust gas emission device having an output and fuel efficiency improvement and noise reduction function according to a second embodiment of the present invention.
6 is a cross-sectional view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a second embodiment of the present invention.
7 is a view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a third embodiment of the present invention.
8 is a view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a fourth embodiment of the present invention.
9 is a view showing an example of the installation of a vehicle exhaust gas exhaust device having an output and fuel efficiency improvement and noise reduction function according to the present invention.

Hereinafter, features of the vehicle exhaust gas exhaust device having an output and fuel efficiency improvement and noise reduction function according to the present invention may be understood by embodiments described in detail with reference to the accompanying drawings.

The present invention can be applied to various changes and may have various forms, and the embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that it includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

1 to 4 and 9 are views illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement and noise reduction function according to a first embodiment of the present invention.

According to this, the exhaust gas exhaust device 1 for a vehicle having an output, fuel efficiency improvement and noise reduction function of the present invention is installed in a vehicle such as a bus (B), a truck, or the like, and exhaust gas moves from front to rear. (10), provided on the rear side of the exhaust pipe (10), when external air flows in, the inner tube (20) for converting and discharging the turbulent exhaust gas flowing from the exhaust pipe (10) into a laminar flow form, and the inner tube ( 20) is provided so as to cover the spaced apart and consists of an outer tube (30) that bypasses when external air flows in to prevent backflow of exhaust gas at the end.

It is preferable that both of the exhaust pipe 10 and the inner tube 20 and the outer tube 30 are made of a metal material such as aluminum material having excellent heat transfer.

First, looking at the concept of laminar flow and turbulent flow, laminar flow shows a flow in which fluid particles move in a smooth, parallelly aligned form and does not disturb, and turbulent flow The fluid particles show irregular and swirling flow, and active disturbance occurs.

At this time, laminar flow occurs when the viscous force is much greater than the inertial force of the flow. A dimensionless number representing the relationship between inertial force and viscous force is the Reynolds number, and laminar flow occurs when the Reynolds number is small.

At this time, the Reynolds number is one of several dimensionless numbers capable of determining dynamic similarity in the field of fluid mechanics. When the main dimensionless numbers of geometrically similar fluid flows represent the same value, it can be judged that the fluid flow is dynamically similar, which is an important indicator for realizing a model close to the prototype in dimensional analysis. do. The Reynolds number is used to determine which fluid flow is laminar flow or turbulent flow.

For reference, the Reynolds number of laminar flow is 2100 or less, 2100 ~ 4000 is an intermediate step (transition step), and turbulence is 4000 or more.

Hereinafter, each configuration of the present invention will be described in detail.

The exhaust pipe 10 includes a first cylindrical portion 12 and a first cylindrical portion 12 in which a first gas flow path 11 through which exhaust gas discharged from an exhaust portion such as a muffler moves from front to rear is formed. A plurality of internal cooling fins 13 provided at equal intervals in the longitudinal direction on the inner circumferential surface, and a plurality of external cooling fins 14 provided at equal intervals in the longitudinal direction on the outer circumferential surface of the first cylindrical portion 12 ) And extends to the rear end of the first cylindrical portion 12 and is made of a shaft pipe portion 15 that shrinks toward the central axis toward the rear.

At this time, the exhaust pipe 10 is made of an aluminum material having excellent heat transfer, and heat of the exhaust gas moving through the first gas flow path 11 moving the first cylindrical portion 12 is easily transferred.

Moreover, a plurality of internal and external cooling fins 13 and 14 are provided inside and outside the first cylindrical portion 12, when the exhaust gas moves through the first gas flow path 11 of the first cylindrical portion 12. Since the contact area is enlarged, the internal cooling fin 13 can absorb heat of the exhaust gas more quickly, and the external cooling fin 14 can faithfully perform a heat dissipation function that releases heat of the exhaust gas to the atmosphere more quickly. This structure condenses exhaust gas moving through the first gas flow path 11 of the first cylindrical portion 12 to change turbulence into laminar flow to facilitate exhaust flow.

In this case, a certain angle is given to the end of the cooling fin to generate a vortex in the external air flowing in, thereby increasing the flow rate so that the sucked external air flows quickly into the inner tube 20 and the outer tube 30. .

The internal and external cooling fins 13 and 14 are preferably integrally joined to the surface of the first cylindrical portion 12 through welding or the like, but are not limited thereto and can be fixed in various ways.

In addition, the shaft tube portion 15 extends to the rear end of the first cylindrical portion 12 and contracts toward the central axis toward the rear to discharge exhaust gas through the discharge hole 15a toward the inner tube 20. Since the inner diameter and the outer diameter of the shaft pipe portion 15 decreases toward the rear, the exhaust gas moving through the first gas flow path 11 increases the flow rate while decreasing the cross-sectional area toward the rear, thereby rapidly moving the exhaust gas. Therefore, the flow of exhaust gas is smoothed. At this time, the outer surface of the shaft portion 15 is also formed to be inclined, and the external air guided to the external cooling fin 14 moves.

On the other hand, the inner pipe 20 surrounds the shaft pipe portion 15 of the exhaust pipe 10 spaced apart and guides an air guide path 25 that guides external air to flow into the front most of the second gas flow path 21. The first outside air guide portion 22 and the rear end of the first outside air guide portion 22 extends to the rear end of the first outside air guide portion 22, which is axially oriented toward the rear to form and wraps away the axial pipe portion 15 of the exhaust pipe 10 apart. A second cylindrical portion 23 in which a second gas flow path 21 through which exhaust gas discharged through the exhaust hole 15a of the shaft pipe portion 15 of the exhaust pipe 10 moves from front to rear is formed, and the agent 2 is provided to extend to the rear end of the cylindrical portion 23, but consists of a first expanding portion 24 that expands in the circumferential direction toward the rear.

At this time, the inner tube 20 is provided so as to surround the shaft pipe portion 15 of the exhaust pipe 10 spaced apart from the first air guide portion 22, the shaft pipe portion 15 and the first outdoor air of the exhaust pipe 10 External air is introduced into the second gas flow path 21 of the second cylindrical portion 23 through the air guide path 25 between the guide portions 22 and discharged to the rear. Such a structure allows external air to be sucked into the second gas flow path 21 of the second cylindrical portion 23 to convert turbulent exhaust gas into laminar flow, which lowers the exhaust rate and temperature of the exhaust gas to lower the exhaust gas. Flow can be done quickly and smoothly.

In addition, as the rear end of the second cylindrical portion 23 extends toward the rear, the first expanding portion 24 that is expanded in the circumferential direction is extended to discharge exhaust gas smoothly.

And the outer tube 30 is a structure surrounding the outer side of the inner tube 20 as a whole, spaced toward the rear toward the central axis, spaced apart from the first outside air guide portion 22 of the inner tube 20 The second outside air guide part 32 forming the first bypass passage 31a that moves the front air from the front to the rear and extends to the rear end of the second outside air guide part 32, and the inner tube ( A third cylindrical portion 33 that surrounds the second cylindrical portion 23 of 20) and forms a second bypass passage 31b through which external air moves from front to rear, and the third cylindrical portion 33 ) Is provided to extend to the rear end of the third bypass passage (31c) that extends in the circumferential direction toward the rear and surrounds the first expansion portion (24) of the inner tube (20) to be spaced apart from the outside. ) To form a second expansion pipe 34 to prevent back flow when exhaust gas is discharged from the second gas flow path 21.

At this time, the external air flowing in from the front of the outer tube 30 is the first to third bypass paths of the second outside air guide part 32, the second cylindrical part 23, and the second expanding part 34 ( 31a, 31b, 31c) are sequentially bypassed and finally discharged by mixing with exhaust gas.

The structure of the outer tube 30 suppresses back-flow generated when exhaust gas flowing outward from the inner tube 20 is discharged into the atmosphere by flowing outside air to the outside of the inner tube 20 This improves the emission rate of exhaust gas and also suppresses the occurrence of noise by extinguishing the vacuum phenomenon.

The exhaust pipe 10 and the inner tube 20 and the outer tube 30 may be integrally coupled by fastening means (2, 3) such as bolts and nuts. For example, the first air guide portion 22 and the second air guide portion 32 of the outer pipe 30 of the shaft pipe portion 15 and the inner pipe 20 of the exhaust pipe 10 are fastened with bolts, nuts, etc. Combined integrally with the means (2), the first expansion portion 24 of the inner tube 20 and the second expansion portion 34 of the outer tube 30 are integrated with fastening means 3, such as bolts and nuts By combining with the exhaust pipe 10 and the inner tube 20 and the outer tube 30 can be firmly assembled.

On the other hand, the first cylindrical portion 12 of the first pipe portion 12 of the exhaust pipe 10 is formed with a guide blade 12a with an end projecting inward so that a through hole 12b is formed, so that the first cylindrical portion 12 when the exhaust gas moves ) Guides the first gas flow path 11 of the first cylindrical portion 12 through the through hole 12b by the guide blade 12a when moving.

And on the outer side of the first cylindrical portion 12, a fourth via guiding the air guided to the outside of the first cylindrical portion 12 through the through hole 12b to the outer rear end of the first cylindrical portion 12. The path 18 is formed. In this case, it is preferable that the fourth bypass path 18 is integrally joined to the finishing plate 14a by welding or the like to a part of the plurality of external cooling fins 14, but is not limited thereto and can be fixed in various ways. Can be.

In addition, the rear end of the fourth bypass path 18 is in communication with the air guide path 25 and the first bypass path (31a).

At this time, the guide vane 12a and the fourth bypass path 18 are arranged with a plurality of equal intervals on the inside and outside of the first cylindrical portion 12, for example, the guide vane 12a and It is preferable that four fourth bypass paths 18 are provided at intervals of 90 ° from the center of the first cylindrical portion 12.

Therefore, when the exhaust gas moves through the first gas flow path 11 of the first cylindrical portion 12, some exhaust gas is removed from the outside of the first cylindrical portion 12 through the through hole 12b by the guide vane 12a. 4 is guided to the air guide path 25 and the first bypass path 31a formed by the inner pipe 20 and the outer pipe 30 through the bypass path 18.

Such a structure can further improve the exhaust gas emission effect by inducing that the exhaust gas is rapidly moved backward through the plurality of fourth bypass paths 18 even when there is no external air inflow when the vehicle is stopped.

Next, FIGS. 5 to 6 are views illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a second embodiment of the present invention.

This relates to the exhaust pipe 10 as a modification of the first embodiment of the present invention.

In the center of the first gas flow path 11 formed in the first cylindrical portion 12 of the exhaust pipe 10, a streamlined induction port 40 is provided in the central axis direction and is fixed by the support member 41. The streamlined induction port 40 has a structure in which the outer diameter decreases from front to rear, and prevents turbulence generated in the center of the pipe of the exhaust pipe 10, thereby converting it into laminar flow and improving the flow rate of exhaust gas.

This increases the exhaust gas velocity while laminar flows through the inner wall of the first gas flow path 11 of the exhaust pipe 10, but since a turbulent flow is generated in the center, the flow of the exhaust gas is inhibited to install the streamlined induction port 40. By preventing turbulence generated in the center of the exhaust gas pipe to convert to laminar flow and improve the exhaust gas speed. That is, the exhaust gas in the center is guided in the form of laminar flow and laminar flow and turbulence collide in the exhaust pipe 10 to prevent the flow from being impeded, and the exhaust gas flow is smoothly performed on all sides of the exhaust pipe 10.

This streamlined induction port 40 is installed in the first part of the first gas flow path 11 of the exhaust pipe 10, and is preferably applied when the overall length of the exhaust pipe 10 is long.

And FIG. 7 is a view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement, and noise reduction function according to a third embodiment of the present invention.

This relates to the inner tube 20 which is provided on the rear side of the exhaust pipe 10 and converts and discharges the exhaust gas in the form of turbulent flow from the exhaust pipe 10 into laminar flow when external air is introduced.

The inner circumferential surface of the second gas flow path 21 formed in the second cylindrical portion 23 of the inner tube 20 is formed in a coil spring shape, and is provided with a coil-type induction port 26 for switching the direction of exhaust gas. That is, the coil-type induction port 26 has an outer surface fixed to the inner circumferential surface of the second gas flow path 21, so that the central portion of the second gas flow path 21 has a structure without clogging and moves to the edge of the second gas flow path 21. To change the flow of laminar exhaust gas.

When the exhaust gas moves in the front-rear direction of the inner tube 20, the coil-type induction port 40 induces the exhaust gas moving along the edge of the second gas flow path 21 to move from front to rear while rotating in one direction. It improves the exhaust velocity, that is, the flow velocity.

The coil-type induction port 40 is preferably applied when the length of the entire inner tube 10 is long.

And, FIG. 8 is a view illustrating a vehicle exhaust gas emission device having an output, fuel efficiency improvement and noise reduction function according to a fourth embodiment of the present invention.

This relates to the inner tube 20 which is provided on the rear side of the exhaust pipe 10 and converts and discharges the exhaust gas in the form of turbulent flow from the exhaust pipe 10 into laminar flow when external air is introduced.

On the inner circumferential surface of the second gas flow path 21 of the inner tube 20, a concave groove 27, such as a dimple on the surface of a golf ball, is maintained at equal intervals and partially (middle section) or entirely formed, thereby causing friction during exhaust gas movement. By reducing the stress, air flow can be induced smoothly.

As described above, the embodiments of the present invention have been described in detail, but the scope of the present invention is not limited to this, and the scope of the present invention extends to substantially the same range as the embodiments of the present invention.

1: Flue gas exhaust system 10: Exhaust pipe
11: 1st gas flow path 12: 1st cylindrical part
13: internal cooling fin 14: external cooling fin
15: shaft tube 20: inner tube
25: air guide 22: first outside air guide
21: second gas flow path 23: second cylindrical portion
24: first expansion portion 26: coil type induction port
30: outer tube 31a: to the first bypass
31b: 2nd bypass 31c: 3rd bypass
32: second outside air guide part 33: third cylindrical part
34: second expansion portion 40: streamlined guide
41: support member

Claims (9)

Exhaust gas is provided at the rear of the exhaust pipe 10 and the exhaust pipe 10 moving from front to rear, and external air is introduced into the turbulent exhaust gas flowing from the exhaust pipe 10 in a laminar flow. It is composed of an inner tube 20 for converting and discharging, and an outer tube 30 provided to surround the inner tube 20 to be separated and bypassed to prevent backflow of exhaust gas at the end by bypassing outside air. Exhaust pipe 10 is made of aluminum, but in the longitudinal direction on the inner circumferential surface of the first cylindrical portion 12 and the first cylindrical portion 12 on which the first gas flow path 11 through which exhaust gas moves from front to rear is formed. A plurality of internal cooling fins 13 provided with maintaining an equal interval, and a plurality of external cooling fins 14 provided with maintaining an equal interval in the longitudinal direction on the outer circumferential surface of the first cylindrical portion 12, and the agent It is made of a shaft tube portion 15 extending to the rear end of the cylindrical portion 12 and shrinking toward the central axis toward the rear side;
The inner tube 20 surrounds the shaft pipe portion 15 of the exhaust pipe 10 and is rearward to form an air guide path 25 that guides external air to be introduced into the front most of the second gas flow path 21. The first outside air guide portion 22 and the rear end of the first outside air guide portion 22, which are axially oriented toward the central axis and enclose the shaft pipe portion 15 of the exhaust pipe 10, are spaced apart. ) A second cylindrical portion 23 in which the second gas flow path 21 through which the exhaust gas discharged through the discharge hole 15a of the shaft tube portion 15 moves from front to rear is formed, and the second cylindrical portion It is provided to be extended to the rear end of (23), but is made of a first expansion portion 24 that expands in the circumferential direction toward the rear side;
The outer tube 30 is axially piped toward the central axis toward the rear to surround the first outer air guide portion 22 of the inner tube 20 spaced apart from the first bypass path through which external air moves from front to rear ( 31a) and the second outside air guide portion 32 and the second outside air guide portion 32 extending to the rear end of the inner tube 20, the second cylindrical portion 23 is spaced apart from the outside air It is provided to extend to the rear end of the third cylindrical portion 33 and the third cylindrical portion 33 where the second bypass path 31b moving from front to rear is formed, but as it goes rearward, it expands in the circumferential direction. When discharging the exhaust gas of the second gas flow path 21 by forming a third bypass path 31c in which external air moves from front to rear by wrapping the first expansion pipe portion 24 of the inner pipe 20 apart. Vehicle exhaust gas exhaust device having an output and fuel efficiency improvement and noise reduction, characterized in that it consists of a second expansion portion (34) to prevent backflow.
delete According to claim 1,
External air flowing in from the front of the outer tube 30 is the first to third bypass passages 31a of the second outside air guide part 32, the second cylindrical part 23, and the second expanding part 34. 31b, 31c), the exhaust gas emission device for vehicles with an output, fuel efficiency improvement and noise reduction, characterized in that sequentially through.
According to claim 1,
A vehicle exhaust gas exhaust system having an output, fuel efficiency improvement and noise reduction function characterized in that the inner circumferential surface of the exhaust pipe (10) is formed with concave grooves that can induce air flow smoothly by reducing frictional stress. .
According to claim 1,
In the center of the first gas flow path 11 of the exhaust pipe 10, a streamlined induction port 40 is fixed in the direction of the central axis by a support member 41, and the streamlined induction port 40 has an outer diameter from front to rear. Exhaust gas exhaust system for vehicles with a power reduction and noise reduction function, characterized in that the reduced structure.
According to claim 1,
The inner peripheral surface of the second gas flow path 21 of the inner tube 20 is made of a coil spring shape and further comprises a coil-type induction port 26 for changing the direction of the exhaust gas output and fuel economy and Exhaust gas exhaust system for vehicles with noise reduction function.
According to claim 1,
On the inner circumferential surface of the second gas flow path 21 of the inner tube 20, a concave groove 27 capable of smoothly guiding air flow by reducing frictional stress during exhaust gas movement is maintained at equal intervals. Exhaust gas exhaust system for vehicles with power and fuel efficiency improvement and noise reduction function.
According to claim 1,
In the first half of the first cylindrical portion 12 of the exhaust pipe 10, a guide blade 12a with an end protruding inward and forward is formed so that a through hole 12b is formed, and an outer side of the first cylindrical portion 12 is formed. A fourth bypass path 18 guiding the air guided to the outside of the first cylindrical portion 12 through the through hole 12b to the air guide path 25 and the first bypass path 31a Exhaust gas exhaust system for vehicles with improved output, fuel efficiency and noise reduction.
The method of claim 8,
The guide vane 12a and the fourth bypass passage 18 have an output and fuel efficiency improvement and noise reduction function, characterized in that a plurality of are arranged on the inner and outer sides of the first cylindrical portion 12 at equal intervals. Equipped with a vehicle exhaust system.

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