KR100925938B1 - Exhaust gas radiation noise decreasing typed exhaust system in vehicle - Google Patents

Abstract

The center silencer 4 constituting the exhaust system of the present invention has an appearance while forming a chamber 5b space between the BULKY Glass Wool Mat type front and rear end sound absorbing materials 11 and 12 filled therein. By applying the housing 5 which consists of curved-style upper and lower cases 5 'and 5 "which formed this foamed formation part 5a which comprises this curved surface, a pair of inflow and discharge tubes 7 and 7' is carried out. , 9, 9 ') improves room quietness by about 5dB through vibration reduction of the exhaust gas as well as vibration reduction of the housing 5, which increases natural vibration stiffness. In addition, as the upper and lower cases (5 ', 5 ") with the glass wool mat sandwiched while forming the housing (5) is coupled to each other through the reinforcement pipe 13 without welding, as the gap formation is eliminated , The corrosion resistance of the housing (5) exposed to the outside will also be improved.

Radiation, exhaust, silencer

Description

Exhaust gas radiation noise reducing typed exhaust system in vehicle

The present invention relates to an exhaust device of a vehicle, and more particularly to an exhaust device of an exhaust emission reduction type vehicle.

In general, the exhaust device reduces the exhaust noise by lowering the temperature and pressure of the exhaust gas discharged from the engine, reduces the pollutants, and then acts to discharge it to the outside.

Such an exhaust device not only discharges the exhaust gas into the atmosphere but also serves to increase the engine power to facilitate the performance of the engine with the increased power.

Such exhaust devices are usually equipped with various devices to reduce pollutants, noise and back pressure on the exhaust pipes connected to the exhaust manifold mounted on the engine, that is, by installing WCC and UCC type catalyst from the engine side to reduce the pollutants Then, the center silencer and the main silencer are installed to reduce the noise and back pressure, and to be discharged to the outside through the tail pipe.

In addition, as a high output engine is used to form a large back pressure due to an increase in the explosion sound, various techniques for improving the performance of the exhaust system are applied. For example, in the case of a silencer, considering the stiffness, weight, and cost of increasing the explosion sound, In addition to optimized case thickness design, it has been developed to achieve low back pressure to reduce radiated sound by passing exhaust gas, to prevent optimal thermal damage to surrounding area, and to reduce atmospheric emission noise.

However, the technology for improving the performance of the exhaust system has a limitation as various methods and devices are used to improve the fuel economy of the engine, for example, to improve the fuel efficiency in response to lowering the operating RPM of the engine or lowering the idle (Idle) RPM The application of the damper clutch for excessively increases the exhaust booming noise.

The engine-side change factor applying the ECU, the TCU and the damper clutch is to reduce the exhaust system performance, especially through the center silencer located between the catalyst forming the exhaust system and the main silencer installed at the rear end. Sound reduction performance is weak.

To this end, the design of the center silencer is changed. For example, the thickness of the case, the thickness of the exhaust gas flow tube is increased, or the amount of sound absorbing material filled into the silencer is increased. There is a limit to lower radiation noise reduction compared to the cost and weight of the center silencer.

Accordingly, the present invention has been made in view of the above, and the curved shape of the housing of the center silencer located between the catalyst forming the exhaust system and the main silencer is applied to reduce the soundproofing and to provide the appearance without welding. The purpose of the present invention is to reduce the vibration of the housing and to reduce the accelerated transmission sound of the exhaust gas so as to improve the quietness of the room.

The present invention for achieving the above object, an exhaust pipe is installed so that the exhaust device of the vehicle collects the exhaust gas generated in the engine and discharged to the outside, and a pair of catalytic converters mounted close to the engine while being mounted on the exhaust pipe And a center silencer mounted to the exhaust pipe at a distance from the second catalytic converter (UCC) located at a rear end thereof, and a center silencer mounted to the exhaust pipe at a distance from the center silencer. In the exhaust device composed of a main silencer for reducing the noise of the exhaust gas exiting,
The center silencer and the housing made of upper and lower cases through which the reinforcing pipe is coupled to each other,
Front and rear fillers filled with both portions of the housing to form an inner space of the housing as a chamber space into which exhaust gas is introduced;
A pair of inflow tubes through which the exhaust filler penetrates the exhaust space into the chamber space of the housing;
A pair of discharge tubes installed through the rear filler to discharge the exhaust gas introduced into the chamber space of the housing to the outside;
It is characterized by consisting of a cover surrounding the inlet / outlet tube.

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In addition, the upper and lower cases of the housing form a recessed forming glove, and a glass wool mat is further provided as a coupling portion of the upper and lower cases.

The reinforcement pipe is formed by welding grooves recessed in the upper and lower cases forming the housing, and then fixed by welding portions fixing both ends in the state where the reinforcing pipe penetrates the welding groove portion.

According to the present invention, the center silencer is placed between the catalyst and the main silencer constituting the exhaust device by combining a center silencer, which is a housing formed of a case coupled to each other without welding, and has a curved housing. The housing vibration is reduced by increasing the housing natural frequency stiffness of the silencer, and at the same time, it is possible to improve the quietness of the room (about 5 dB) by reducing the accelerated transmission sound and emission sound of the exhaust gas.

In addition, the center silencer of the present invention is formed by the curved surface of the housing to improve the appearance, while also using the reinforcing member to support the coupling structure of the silencer without the use of welding to improve the corrosion resistance.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

Figure 1 (a), (b) shows the configuration of the exhaust device of the exhaust emission reduction type vehicle according to the present invention, the exhaust device according to the present invention is equipped with a catalytic converter located close to the engine, An exhaust pipe 1 connected to discharge the exhaust gas to the outside, and a center silencer 4 and a main silencer 20 sequentially mounted on the exhaust pipe 1 so as to be located close to the engine side. It consists of.

Here, the catalytic converter is connected to the exhaust pipe 1 at intervals between the first catalytic converters 2 and WCC installed in the exhaust pipe 1 and the first catalytic converters 2 and WCC at a position proximate to the engine side. It consists of the 2nd catalytic converter 3 and UCC which were installed.

In addition, the center silencer 4 significantly reduces radiation noise when the exhaust gas passes, reducing indoor noise by 5 db, and reducing external emission of the exhaust gas heat passing through, thereby damaging the exhaust radiation around the silencer. It will act to prevent.

To this end, the center silencer 4 is composed of upper and lower cases 5 'and 5 "coupled to each other, and a housing 5 for forming an inner space through which exhaust gas is introduced and discharged, and the housing ( BULKY Glass Wool type front / rear fillers 11 and 12 filled with both parts of the housing 5 to form the interior space of 5) into the space of the chamber 5b into which the exhaust gas flows, and the tip fillers. A pair of inflow tubes (7, 7 ') for passing the exhaust gas into the chamber (5b) space of the housing (5) through the (11) and the exhaust gas introduced into the chamber (5b) space of the housing (5) It is composed of discharge tubes (9, 9 ') installed through the rear end filler (12) so as to discharge to the outside.

In addition, the inlet and outlet tubes 7, 7 ', 9 and 9' are covered with covers 8, 8 ', 10 and 10' such that they do not directly contact the front and rear fillers 11 and 12. The covers 8, 8 ', 10, 10' are made of stainless wool.

In addition, the upper and lower cases (5 ', 5 ") constituting the housing (5) to strengthen the bonding rigidity by using the reinforcement pipe 13 in two places without welding, for this purpose, Figure 1 (b) As shown in the figure, after forming the welding grooves 5c recessed in the upper and lower cases 5 'and 5 ", both ends of the welding grooves 5c in the state where the reinforcing pipe 13 penetrates are respectively. The welding portion K to be fixed is formed.

In this case, the reinforcing pipe 13 is coupled to a position where the front end sound absorbing material 11 of the housing 5 is filled and a position forming a space of the chamber 5b of the housing 5, respectively.

The upper and lower cases 5 'and 5 "of the housing 5 form a forming glove 5a recessed at equal intervals, as shown in FIGS. 2A and 2B. As a coupling portion of the upper and lower cases 5 'and 5 ", a glass wool mat is further provided.

At this time, the forming glove 5a formed on the upper and lower cases 5 'and 5 "is recessed while forming a curved surface.

In addition, the inflow tubes 7 and 7 'form a sloped section at the inlet portion to make the flow path of the incoming exhaust gas longer, and have a straight section, and discharge the slanted section and the straight section. Holes 7a, 7a ', 7b and 7b' are drilled respectively.

The discharge holes 7a, 7a ', 7b, and 7b' discharge a portion of the exhaust gas flowing through the inflow tubes 7 and 7 ', and thus cover the inlet tube 7 and 7'. 8 ') and the tip filler 11 reduce noise by converting the noise energy into thermal energy.

In addition, the discharge tube (9, 9 ') is formed in a straight section through the rear end filler 12 of the housing (5) while passing through the discharge holes (9a, 9a'), the inlet for the exhaust gas flows The site is equipped with a bell mouse.

As such, the bell mouth provided as an inlet portion reduces the airflow resistance of the exhaust gas flowing into the discharge tubes 9 and 9 ', and some exhaust gases discharged into the discharge holes 9a and 9a' are discharge tube ( 9, 9 ') and the cover (10, 10') and the rear end filler 12 to reduce the noise energy is converted into thermal energy to reduce the noise.

Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

The center silencer 4 constituting the exhaust system of the present invention has an appearance while forming a chamber 5b space between the BULKY Glass Wool Mat type front and rear end sound absorbing materials 11 and 12 filled therein. By applying the housing 5 which consists of curved-style upper and lower cases 5 'and 5 "which formed this forming curved part 5a which consists of a curved surface, a pair of inflow and discharge tubes 7 and 7' are applied. , 9, 9 ') improves room quietness by about 5dB through vibration reduction of the exhaust gas as well as vibration reduction of the housing 5, which increases natural vibration stiffness. In addition, as the upper and lower cases (5 ', 5 ") with the glass wool mat sandwiched while forming the housing (5) is coupled to each other through the reinforcement pipe 13 without welding, as the gap formation is eliminated , The corrosion resistance of the housing (5) exposed to the outside will also be improved.

The exhaust device of the present invention having this feature is implemented through a center silencer 4 mounted on the exhaust pipe 1, for which the center silencer 4 is shown in FIG. 2. , A pair of inflow tubes 7, which are surrounded by the fillers 11 and 12 and the covers 8, 8 ′, 10 and 10 ′ so that the exhaust gas is introduced into and discharged through the space of the chamber 5 b therein. 7 ') and a housing 5 having discharge tubes 9 and 9', the housing 5 having a curved surface with the forming formation portion 5a, and a reinforcement pipe without welding. 13) is composed of upper and lower cases (5 ', 5 ") fitted with a glass wool mat.

In this case, the reinforcing pipe 13 is coupled to two places of the housing 5, that is, the position where the front end sound absorbing material 11 is filled and the position forming the space of the chamber 5b of the housing 5, respectively, The welding grooves 5c recessed in the upper and lower cases 5 'and 5 "are formed to be joined to the reinforcing pipes 13, and then welded.

Accordingly, when the exhaust gas discharged from the engine flows into the pair of inflow tubes 7 and 7 'forming the center silencer 4, the inflow tubes 7 and 7' are shown in FIG. The exhaust gas introduced into the gas is discharged into the space of the chamber 5b in the housing 5, and since the exhaust gas flows through the inclined section, it has a longer flow path.

At this time, some of the exhaust gas flowing through the inlet tube (7, 7 ') is discharged through the discharge holes (7a, 7a', 7b, 7b ') formed in the inclined section and the straight section, respectively, as described above The exhaust gas discharged through the holes 7a, 7a ', 7b, and 7b' is converted into thermal energy by the noise energy through the cover 8 and 8 'and the tip filler 11 surrounding the inlet tubes 7 and 7'. This serves to reduce the noise of the exhaust gas flowing through the inlet tubes 7, 7 ′.

Subsequently, the exhaust gas introduced into the chamber 5b space in the housing 5 through the inflow tubes 7 and 7 'flows into a pair of discharge tubes 9 and 9' positioned in the chamber 5b space. After that, it is discharged toward the exhaust pipe 1, and in this process, some exhaust gas is discharged through the discharge holes 9a and 9a 'formed in the discharge tubes 9 and 9'.

The discharge of some of this exhaust gas is converted into thermal energy by the noise energy through the covers 10 and 10 'and the rear filler material 12 surrounding the discharge tubes 9 and 9', which are discharge tubes 9 and 9 '. Since the noise of the exhaust gas flowing back) is sent out to the exhaust pipe 1 again, the noise of the exhaust gas can be reduced when it enters the housing 5 and is discharged.

At this time, the bell mouth provided as an exhaust gas inlet portion of the discharge tube 9, 9 ′ acts to reduce the air flow resistance of the exhaust gas, and thus the exhaust tube 9, 9 ′ of the exhaust gas in the chamber 5b. The influx is less affected by interference.

In this way, the exhaust gas introduced through the pair of inflow tubes 7 and 7 'and introduced into the chamber 5b space in the housing 5 is again exhausted through the exhaust tubes 9 and 9'. As it is discharged to, as the sound energy is converted into thermal energy through the fillers (11, 12) filled in the housing (5) to reduce the noise, as shown in Figure 3 (a), (b) Likewise, the overall noise performance of the exhaust system with the center silencer 4 can be improved.

1 (a), (b) is a configuration diagram of the exhaust device of the exhaust emission reduction type vehicle according to the present invention

Figure 2 (a), (b) is an external appearance and internal diagram of the silencer for reducing exhaust radiation noise according to the present invention

Figure 3 is a performance analysis of the exhaust device of the exhaust emission reduction type vehicle according to the present invention

    <Description of the symbols for the main parts of the drawings>

1: exhaust pipe 2: first catalytic converter (WCC)

3: second catalytic converter (UCC) 4: center silencer

5: housing 5 ', 5 ": upper and lower case

5a: forming glove 5b: chamber

5c: welding groove 6a, 6b: partition wall

7,7 ': inlet tube

7a, 7a ', 7b, 7b', 9a, 9a ': discharge hole

8,8 ', 10,10': Cover 9,9 ': Outlet tube

11,12: Lead and trailing filler

13: reinforcement pipe

20: Main Silencer

K: weld

Claims (7)

An exhaust pipe 1 installed to collect exhaust gas generated from the engine and discharged to the outside, a pair of catalytic converters 2 and 3 mounted on the exhaust pipe 1 and positioned close to the engine, A center silencer 4 mounted to the exhaust pipe 1 and a center silencer 4 spaced apart from the second catalytic converter 3 and UCC, and an exhaust pipe 1 spaced apart from the center silencer 4. In the exhaust device consisting of a main silencer (20) mounted on the main body (20) to reduce the noise of the exhaust gas exiting the exhaust pipe (1),  The center silencer 4 includes a housing 5 formed of upper and lower cases 5 'and 5 "through which the reinforcing pipe 13 penetrates and is coupled to each other. Front and rear fillers 11 and 12 filled with both portions of the housing 5 so as to form an inner space of the housing 5 into a space of the chamber 5b into which the exhaust gas flows; A pair of inflow tubes (7, 7 ') for introducing exhaust gas into the space of the chamber (5b) of the housing (5) through the tip filler (11), A pair of discharge tubes 9 and 9 'installed through the rear filler 12 to discharge the exhaust gas introduced into the space of the chamber 5b of the housing 5 to the outside; An exhaust device for an exhaust emission reduction type vehicle, characterized in that it comprises a cover (8, 8 ', 10, 10') surrounding the inlet and outlet tubes (7, 7 ', 9, 9'). The upper and lower cases 5 'and 5 "of the housing 5 form a forming glove 5a recessed at equal intervals, and the upper and lower cases 5' and 5". Exhaust device of the exhaust emission reduction type vehicle, characterized in that the coupling portion of the) is further provided with a glass wool mat (BULKY Glass Wool Mat). The method according to claim 1, wherein the inlet tube (7, 7 ') has a straight section after forming an inclined section at the inlet portion to make the flow path of the incoming exhaust gas longer, inclined section and a straight section And exhaust holes 7a, 7a ', 7b, and 7b' are respectively drilled. The discharge tube (9, 9 ') is formed in a straight section through the rear end filler 12 of the housing (5) while the discharge hole (9a, 9a') is drilled, the exhaust gas is An exhaust device for an exhaust emission reduction type vehicle characterized by including a bell mouse as an inlet portion to be introduced. The method according to claim 1, wherein the front and rear fillers 11, 12 are of the glass wool (BULKY Glass Wool) type, the cover (8, 8 ', 10, 10') is characterized in that the stainless wool (Stainless Wool) type. Exhaust system of exhaust emission reduction type vehicle to be made. The method of claim 1, wherein the reinforcement pipe 13 forms a welding groove 5c recessed in the upper and lower cases 5 ', 5 "forming the housing 5, and then the welding groove 5c portion is formed. Exhaust device for exhaust emission reduction type vehicle, characterized in that fixed by welding (K) for fixing both ends in the state where the reinforcing pipe (13) penetrated. The exhaust pipe (13) according to claim 6, wherein the reinforcing pipe (13) is coupled to the position where the front end sound absorbing material (11) of the housing (5) is filled and the position forming the space of the chamber (5b) of the housing (5), respectively. Exhaust system of the emission reduction type vehicle.

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