JP2016133047A - Exhaust emission assembly device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas emission assembly device of an internal combustion engine capable of satisfying both requirements of performance improvement and exhaust emission control performance of the internal combustion engine.SOLUTION: This invention comprises a cylinder 2 storing exhaust emission control device [catalyst carrier 1] and a container 3 formed to enclose this cylinder. This container is formed with a plurality of exhaust emission flow passages 21 to 24 communicated with and connected to a plurality of exhaust emission ports [exhaust ports 11 to 14] between the container and the outer surface of the cylinder, a plurality of exhaust emission flow passages are formed to be communicated with one opening end 2a of the cylinder and a discharging pipe 4 is communicated with and connected to the other opening end 2b of the cylinder. Further, the container is bulged out and formed in an annular manner in a direction crossing at a right angle with an axis of the cylinder to form a plurality of annular flow passages 31 to 34 and at the same time it is sufficient that a guide part 3a for guiding exhaust emission to the opening end 2a of the cylinder is formed in the container.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exhaust gas collecting apparatus for an internal combustion engine, and more particularly to an exhaust gas collecting apparatus for an internal combustion engine that incorporates an exhaust purification device and is suitable for an internal combustion engine of an automobile.

  In an exhaust gas collection device that is mounted on a multi-cylinder internal combustion engine and collects exhaust gases exhausted from a plurality of exhaust ports and supplies them downstream, avoid interference of exhaust gases intermittently exhausted from each exhaust port, There is a demand for a function that uses exhaust inertia to suck exhaust gas from the combustion chamber and increase the filling efficiency of the combustion chamber to improve the output performance of the internal combustion engine. Therefore, it is required that the branch length can be set arbitrarily long and arbitrarily. In particular, in a four-cylinder internal combustion engine, for example, a branch of the first cylinder and a branch of the fourth cylinder are aggregated, a branch of the second cylinder and a branch of the third cylinder are aggregated (4 → 2), and these are further combined into one exhaust. In the so-called “4-2-1 aggregation” mode in which the tubes are aggregated (2 → 1), not only the branch length of “4-2” but also the branch length of “2-1” (and “4-2-1”). "Overall length) tuning is also important.

  Furthermore, in order to actively utilize exhaust pulsation, we focus not only on setting the position of each branch length and merging section, but also focusing on the enhancement of the variable valve timing mechanism, and actively utilizing exhaust pulsation wave matching in all speed ranges. However, it has also been proposed to improve the filling efficiency in the entire rotational speed region. For example, the following Patent Document 1 states that “a spark ignition type that can achieve high torque by a high compression ratio engine while effectively suppressing knocking in a high load range of low and medium speed ranges of the engine. “To provide a multi-cylinder engine”, “the geometric compression ratio of the engine is set to a high compression ratio exceeding 12, and the branch exhaust passage connected to the exhaust port of each cylinder is adjacent to the exhaust order. Exhaust manifolds that are not aligned with each other and are gathered by the first gathering portion, and an intermediate exhaust passage downstream of each first gathering portion is gathered by the second gathering portion, and are provided downstream of the exhaust manifold, and the exhaust passage section A plurality of cavity expansion chambers having an enlarged space portion, an exhaust valve timing variable mechanism for changing the opening timing of the exhaust valve, and an ignition for controlling the ignition timing of the spark plug provided in each cylinder An apparatus having a period control means and an effective compression ratio adjusting means for adjusting an effective compression ratio is disclosed, and an apparatus specifying each means has been proposed (paragraphs [0009] and [0010] of Patent Document 1). Described in).

  In addition, the following Patent Document 2 states that “the exhaust pipe length of the exhaust manifold can be set freely, a sufficient space for the catalyst can be secured, and the catalyst performance can always be maintained at the highest level. The purpose of these is to provide a catalyst arrangement structure in an exhaust system of a multi-cylinder internal combustion engine that can achieve both high output and low emission of the internal combustion engine. A first arrangement exhaust pipe portion in which a plurality of exhaust pipes, one end of which is connected to an exhaust port of the internal combustion engine, extends in a direction away from the internal combustion engine main body, and the first arrangement exhaust pipe. The second constituent exhaust pipe part having a first curved part following the part and inverting in a direction approaching the internal combustion engine body, and the second curved part following the second constituent exhaust pipe part. And the internal combustion engine body A third constituent exhaust pipe portion that reverses in the direction of moving away, and a downstream side of the third constituent exhaust pipe portion is connected to a catalyst, and the catalyst is connected to the first constituent exhaust pipe portion and the second constituent exhaust pipe portion. And a catalyst arrangement structure in the exhaust system of a multi-cylinder internal combustion engine, which is arranged in a space formed by being surrounded by the third constituent exhaust pipe portion (see paragraph [Patent Document 2]). 0007] and [0008]).

Japanese Patent No. 4999310 JP 2001-152840 A

  In the exhaust gas collecting apparatus that actively utilizes the exhaust pulsation described in Patent Document 1, the branch length is made equal in relation to the timing at which the reflected wave reverses to the negative pressure wave at the junction and returns to the combustion chamber, And it is required to set as long as possible. However, in order to meet such demands, the length from the exhaust port to the collecting portion and the distance from the downstream side to the exhaust gas purification device (catalytic converter) cannot be shortened. Performance improvement requirements and exhaust purification performance requirements are contradictory.

  In other words, it is difficult to avoid an increase in the size of the exhaust gas collecting device in order to satisfy the performance improvement requirements of the internal combustion engine. In the narrow engine room, avoid the physical interference with other parts and the influence of heat. It is very difficult to install a collective device. This is the same not only in the above-described “4-2-1 set” mode but also in the so-called “4-1 set” mode. In addition, in order to satisfy the exhaust purification performance requirements, not only the exhaust purification device needs to be enlarged, but it must be arranged on the upstream side (internal combustion engine side), multiple mounted, etc. Remain.

  In order to solve the above contradictory problems, the configuration described in Patent Document 2 is one method, but complicated bending processing and difficult welding for manufacturing a branch pipe are required. Therefore, cost increases are inevitable. In addition, the three-dimensional winding is arranged in parallel with the internal combustion engine. However, in order to change the setting of the branch length, it is necessary to adjust the lengths of the four branch pipes in a three-dimensional path. As a result, there is almost no freedom in setting the branch length. Further, the branch pipes vibrate individually with the vibration of the internal combustion engine. However, as described in Patent Document 2, a long branch pipe with many bent portions is easy to vibrate, and suppresses the vibration at the time of high rotation of the internal combustion engine. It is very difficult.

  Therefore, an object of the present invention is to provide an exhaust gas collecting apparatus for an internal combustion engine that can satisfy both the performance improvement requirement and the exhaust purification performance requirement of the internal combustion engine.

  In order to achieve the above object, the present invention provides an exhaust gas collecting apparatus for an internal combustion engine that is connected to a plurality of exhaust ports of the internal combustion engine and incorporates an exhaust gas purification apparatus, and a cylinder that houses the exhaust gas purification apparatus; A container formed so as to surround the cylindrical body, wherein a plurality of exhaust passages connected to the plurality of exhaust ports are formed between the outer surface of the cylindrical body and the plurality of exhaust gases The flow path includes a container formed so as to communicate with one open end of the cylindrical body, and a discharge pipe connected to the other open end of the cylindrical body.

  In the exhaust collecting apparatus, the plurality of exhaust passages include a plurality of annular passages formed by annularly forming the container in a direction orthogonal to the axis of the cylindrical body. It is good to set it as the structure by which the flow path was arranged in parallel with the said cylinder.

  In the exhaust gas collecting apparatus, the container may include a guide portion that guides the exhaust gas in the plurality of annular channels to one open end of the cylindrical body. Although this guide part can be comprised by joining a cover member to one edge part of a container, it is good also as forming a cover member integrally.

  Furthermore, in the above exhaust collecting apparatus, the container may be arranged such that the axis of the cylindrical body is parallel to the crankshaft of the internal combustion engine. Further, the plurality of exhaust flow paths may have a plurality of branch pipes that connect the plurality of annular flow paths and the plurality of exhaust ports in communication. Furthermore, the plurality of branch pipes may be arranged in parallel in a direction perpendicular to the crankshaft of the internal combustion engine.

  And in the above exhaust gas collecting device, the cylinder is a silencer for reducing exhaust noise on the downstream side of the exhaust gas purification device, an exhaust heat recovery device for recovering heat of the exhaust gas and heating it in the passenger compartment, And it is good to set it as the structure connected to at least 1 apparatus of the thermoelectric power generator which converts the thermal energy of exhaust gas directly into electrical energy.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, in the exhaust gas collecting apparatus for an internal combustion engine according to the present invention, a plurality of cylinders are disposed between a cylindrical body that houses the exhaust gas purification device and an outer surface of the cylindrical body so as to surround the cylindrical body. A plurality of exhaust passages connected to the exhaust port of the cylinder, and a container formed such that the plurality of exhaust passages communicate with one opening end of the cylinder, and the other opening end of the cylinder Since it is equipped with an exhaust pipe that is connected to the exhaust pipe, the branch length required for each exhaust passage can be easily secured, and the exhaust purification device can be enlarged and arranged upstream. , Purification performance and heating rate are improved. Thus, both the performance improvement requirement and the exhaust purification performance requirement of the internal combustion engine can be satisfied.

  In the above exhaust collecting device, the plurality of exhaust passages have a plurality of annular passages formed by annularly bulging the container in a direction perpendicular to the axis of the cylinder, and the plurality of annular passages are cylinders. If it is set as the structure arranged in parallel with the body, the length and arrangement | positioning of an annular flow path can be set freely, and the length of each annular flow path can also be adjusted suitably. Moreover, since the cylindrical body can be kept warm by the wound annular flow path, the purification performance can be maintained without being affected by the operation state.

  Further, in the exhaust collecting apparatus described above, if the container has a guide portion that guides the exhaust gas in the plurality of annular channels to one open end of the cylindrical body, the exhaust gas in the annular channel is guided. It reverses at the part and flows into the cylinder and is uniformly supplied over the entire surface of the catalyst carrier, so that the so-called “uniformity” is high and the desired purification performance can be reliably maintained.

  Furthermore, in the above exhaust collecting apparatus, if the container is arranged so that the axis of the cylinder is parallel to the crankshaft of the internal combustion engine, the space to be arranged can be appropriately utilized. Further, if the plurality of exhaust flow paths have a plurality of branch pipes that connect and connect the plurality of annular flow paths and the plurality of exhaust ports, the space to be mounted can be appropriately utilized. Furthermore, if the plurality of branch pipes are arranged side by side in a direction perpendicular to the crankshaft of the internal combustion engine, the space to be mounted can be utilized more appropriately.

  And in the above exhaust gas collecting device, the cylinder is a silencer for reducing exhaust noise on the downstream side of the exhaust gas purification device, an exhaust heat recovery device for recovering heat of the exhaust gas and heating it in the passenger compartment, and If connected to at least one thermoelectric generator that directly converts the heat energy of the exhaust gas into electrical energy, it can be downsized as a whole, including devices with various functions. Can be used effectively.

1 is a perspective view of an exhaust gas collecting apparatus according to an embodiment of the present invention. 1 is a partial cross-sectional side view of an exhaust gas collecting apparatus according to an embodiment of the present invention. It is the sectional view on the AA line of FIG. 1 is an exploded perspective view of an exhaust gas collecting apparatus according to an embodiment of the present invention. 1 is a plan view of an exhaust gas collecting apparatus according to an embodiment of the present invention. 1 is a perspective view of an exhaust gas collecting apparatus according to an embodiment of the present invention. 1 is a partial cross-sectional side view of an exhaust gas collecting apparatus according to an embodiment of the present invention. It is a top view of the exhaust gas collection apparatus which concerns on other embodiment of this invention. It is a perspective view of the exhaust gas collection apparatus which concerns on other embodiment of this invention. It is a partial cross section side view of the exhaust gas collection apparatus which concerns on other embodiment of this invention. It is a partial cross-sectional perspective view of the exhaust gas collection apparatus which concerns on further another embodiment of this invention. It is a perspective view of the exhaust gas collection apparatus which concerns on another embodiment of this invention. It is a perspective view which shows the exhaust gas collection apparatus which concerns on another embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 7 show an exhaust gas collecting apparatus for an internal combustion engine according to an embodiment of the present invention, and a plurality of (four in this embodiment) exhaust ports (not shown) of an in-line four-cylinder internal combustion engine. As an exhaust gas purification device of the present embodiment, which is connected in communication, a catalyst carrier 1 for purifying exhaust gas is built in a cylindrical body 2, and a buffer member (mat) 1 a is disposed so as to wind the catalyst carrier 1. Yes. In this embodiment, exhaust holes 11 to 14 are formed in the head flange 10 joined to an internal combustion engine (not shown), and these exhaust holes 11 to 14 are arranged so as to face the four exhaust ports. Therefore, the exhaust holes 11 to 14 will be described below with the same purpose as the exhaust ports.

  As shown in FIGS. 1 to 7, a container 3 is formed so as to surround the cylindrical body 2, and communicated with a plurality of exhaust ports (exhaust holes 11 to 14) between the outer surface of the cylindrical body 2. A plurality (four in this embodiment) of exhaust passages 21 to 24 are formed, and these exhaust passages 21 to 24 are formed so as to communicate with one open end 2a of the tubular body 2, so that the tubular body A discharge pipe 4 is connected in communication with the other open end 2b. Thus, in the present embodiment, a so-called “4-1 set” is configured.

  The plurality of exhaust passages 21 to 24 have a plurality (four in this embodiment) of annular passages 31 to 34 formed by annularly forming the container 3 in a direction orthogonal to the axis of the cylinder 2. In addition, these annular flow paths 31 to 34 are arranged around the cylindrical body 2. In the present embodiment, a separate lid member 3 c is joined and closed at one end of the container 3, and the exhaust gas in the annular flow paths 31 to 34 is passed inside the open end of the cylindrical body 2. A guide portion 3a for guiding to 2a is configured. The lid member 3 c may be formed integrally with the container 3. The exhaust passages 21 to 24 include branch pipes (branch pipes) 41 to 44 that connect the annular passages 31 to 34 and the exhaust holes 11 to 14, and the branch pipes 41 to 44 of the present embodiment include: As shown in FIGS. 1 and 5, they are arranged in parallel in a direction orthogonal to a crankshaft (not shown) of the internal combustion engine. Although the discharge pipe 4 is joined to the other end 3 b of the container 3, the exhaust passages 21 to 24 are not connected to the discharge pipe 4 and are joined so as to communicate with the inside of the cylindrical body 2. ing.

  In the present embodiment, an exhaust gas recirculation device (not shown but abbreviated as EGR) that recirculates a part of the exhaust gas to the intake side is further mounted. The circulation channel 35 is joined to the other end 3 b (end on the discharge pipe 4 side) of the container 3 and connected to the open end 2 b of the cylindrical body 2.

  Thus, the exhaust gases discharged from the exhaust holes 11 to 14 are respectively connected to the annular flow paths 31 to 34 of the container 3 via the branch pipes 41 to 44, as indicated by broken line arrows EF1 in FIGS. And is supplied in the direction of the lid member 3c (guide portion 3a) of the container 3 as indicated by a broken line arrow EF2 in FIG. The exhaust gas is reversed by the guide portion 3a as shown by a broken line arrow EF3 in FIG. 5 and guided toward the opening end 2a of the cylindrical body 2 shown in FIG. 7, and as shown by a broken line arrow EF4 in FIG. Then, the exhaust gas that has passed through the catalyst carrier 1 in the cylinder 2 and purified here is discharged from the discharge pipe 4 to a downstream device (muffler or the like) as indicated by a broken line arrow EF5. At this time, a part of the purified exhaust gas is supplied as a recirculation exhaust gas to an exhaust gas recirculation device (not shown) via a recirculation flow path 35 as indicated by a broken line arrow EF6 in FIG. Is done. Normally, an EGR valve is mounted to adjust the flow rate of the recirculation exhaust gas recirculated to the exhaust gas recirculation device, but the illustration is omitted here.

  As is apparent from FIGS. 1 to 7, the annular flow paths 31 to 34 constituting the exhaust flow paths 21 to 24 are formed so as to wind the cylindrical body 2, so that the winding amount and arrangement can be freely set. The lengths of the annular flow paths 31 to 34 can be adjusted as appropriate. Therefore, the length (branch length) required for each of the exhaust passages 21 to 24 can be easily secured. In addition, the exhaust purification device (catalytic converter) can be increased in size and disposed upstream, and the purification performance and the temperature rise rate are improved. Moreover, since the tubular body 2 can be kept warm by the wound branches (annular flow paths 31 to 34), it is possible to maintain the purification performance (maintain the catalyst in an active state) without being affected by the operation state. it can. As a result, the above two contradictory requirements can be satisfied, and the required engine performance and exhaust purification performance can be satisfied. In addition, since the exhaust collecting device of this embodiment can be mounted in a compact manner, when a displacement-compatible joint such as a ball joint is used for fastening the exhaust pipe 4 and the downstream exhaust pipe, the displacement-compatible joint is the center of the engine roll. Since it approaches the axis, the amount of displacement can be reduced and vibration can be suppressed.

  Further, as described above, the exhaust gas collecting apparatus of the present embodiment is configured such that the shaft of the cylinder 2 (and the container 3) extends in parallel to the crankshaft of the internal combustion engine, so that there is a relatively large space. Since the vehicle is disposed in the front-rear direction of a certain vehicle, the space occupation in the other direction, that is, the vertical, left-right direction of the vehicle can be minimized, and the mounting property to the vehicle is also improved. In addition, when mounting on an internal combustion engine (not shown), only the shape of the exhaust pipe 4 can be changed to enable either front-rear or left-right direction of the vehicle. Contributes to reduction. Needless to say, the present invention is not limited to the in-line four cylinders, and can be applied to any internal combustion engine (engine) such as in-line, V-type, and horizontally opposed type with two or more cylinders. Further, the present invention is not limited to mounting for vehicle driving, and can be applied to a power generation engine (particularly, a range extender for EV vehicles). Furthermore, the present invention can also be applied to engines other than vehicles such as farm equipment, ships, and stationary power generation devices.

  Further, after the exhaust gas introduced through the exhaust passages 21 to 24 is gathered, the exhaust gas is reversed by the guide portion 3a, flows into the cylindrical body 2, and is stirred and rectified until reaching the catalyst carrier 1, thereby Since it is uniformly supplied over the entire surface of the carrier 1, the so-called “uniformity” is high, and the desired purification performance can be reliably maintained.

  8 to 10, the first cylinder branch (branch pipe 41) and the fourth cylinder branch (branch pipe 44) are assembled together, and the second cylinder branch (branch pipe 42) and third cylinder branch ( An embodiment of a so-called “4-2-1 set” in which the branch pipes 43) are gathered (4 → 2) and further gathered into one exhaust pipe 4 (2 → 1) is shown. The plurality of exhaust passages 21 to 24 in the present embodiment are a plurality (two in this embodiment) of annular passages 31x formed by annularly forming the container 3x in a direction orthogonal to the axis of the cylinder 2. And 32x, these are provided so as to surround the cylindrical body 2x, and are configured to join the flow path 33x. Accordingly, the length of the “4-2 set” is set by the sum of the lengths of the branch pipes 41 to 44 and the lengths of the annular flow paths 31x and 32x, and the length of the “2-1 set” is the length of the flow path 33x. Set by length. Of the members constituting this embodiment, substantially the same members as those shown in FIGS. 1 to 7 are given the same reference numerals and the description thereof is omitted, but the container 3x shown in FIGS. It is formed smaller than the container 3 shown in FIG.

  Thus, in the present embodiment, the same effect as the embodiment of “4-1 set” shown in FIG. 1 and the like is obtained, but the “2-1 set” of the embodiment shown in FIG. Since there is a portion, the degree of freedom in tuning in the middle and low rotation region is increased. The first cylinder branch (branch pipe 41) and the second cylinder branch (branch pipe 42) are assembled together, and the third cylinder branch (branch pipe 43) and the fourth cylinder branch (branch pipe 44) are combined. It is also possible to adopt a configuration in which they are assembled (4 → 2) and further assembled into one exhaust pipe 4 (2 → 1), or the branch of the first cylinder (branch pipe 41) and the branch of the third cylinder (branch pipe) 43), the branch of the second cylinder (branch pipe 42) and the branch of the fourth cylinder (branch pipe 44) are gathered (4 → 2), and they are further gathered into one exhaust pipe 4 (2 → 2). 1) It is good also as a structure made to do.

  FIG. 11 shows a mode of a tandem catalyst in which two catalyst carriers 1f and 1r are accommodated in series in the axial direction in a cylindrical body 2 similar to FIG. 1 and the like, and the upstream catalyst carrier 1f is a so-called “start catalyst”. ”. 11 to 13, members substantially the same as those shown in FIGS. 1 to 7 are given the same reference numerals and description thereof is omitted.

  In the embodiment shown in FIG. 12, the cylinder 2 is a silencer (not shown) for reducing exhaust noise on the downstream side of the catalyst carrier 1 (or 1r), and recovers the heat of the exhaust gas to heat the interior of the vehicle. An exhaust heat recovery device (not shown) to be provided and a thermoelectric power generator (not shown) that directly converts the heat energy of the exhaust gas into electric energy are connected in communication with each other It is. That is, the cylindrical body 2 of the present embodiment has a cylindrical portion 2c between the catalyst carrier 1 and the discharge pipe 4 described above, and the exhaust heat recovery device and the thermoelectric device are included in the cylindrical portion 2c. Type power generator is configured. Alternatively, the above silencer can be configured in the cylindrical portion 2c by combining an expansion chamber and a resonance chamber, and various functional devices can be interposed between the catalyst carrier 1 and the discharge pipe 4. .

  FIG. 13 shows an embodiment in which a separate silencer 5 is connected to a cylindrical body 2 similar to that shown in FIG. 1 or the like so as to provide a low frequency resonance chamber. This silencer 5 is intended to attenuate exhaust sound of a specific frequency. The volume of the space (resonance chamber) formed in the silencer 5 and the diameter and length of the neck tube (the communication tube 5a in this embodiment). Since the Helmholtz resonance chamber is configured with (and sound velocity) as a parameter, the frequency to be attenuated can be specified. It should be noted that the resonance chamber is not a separate body, and the tubular body 2 and the casing 5b of the silencer 5 are connected by a plurality of communication pipes (not shown) to allow the exhaust gas to flow. It is good also as comprising.

DESCRIPTION OF SYMBOLS 1 Catalyst carrier 2, 2x Cylindrical body 2a, 2b Open end 2c Cylindrical part 3, 3x Container 3a Guide part 3b End part 3c Lid member 4 Exhaust pipe 5 Silencer 10 Head flange 11, 12, 13, 14 Exhaust hole (exhaust port)
21, 22, 23, 24 Exhaust flow path 31, 32, 33, 34 Annular flow path 31x, 32x Annular flow path 41, 42, 43, 44 Branch pipe

Claims (7)

  In an exhaust gas collecting apparatus of an internal combustion engine that is connected to a plurality of exhaust ports of an internal combustion engine and incorporates an exhaust gas purification apparatus, a cylinder body that houses the exhaust gas purification apparatus, and a container that is formed so as to surround the cylinder body A plurality of exhaust passages communicating with the plurality of exhaust ports are formed between the outer surface of the cylinder and the plurality of exhaust passages at one open end of the cylinder. An exhaust gas collecting apparatus for an internal combustion engine, comprising: a container formed to communicate; and a discharge pipe connected to the other opening end of the cylindrical body.   The plurality of exhaust passages have a plurality of annular passages formed by annularly forming the container in a direction orthogonal to the axis of the cylinder, and the plurality of annular passages are formed in the cylinder. The exhaust gas collecting device for an internal combustion engine according to claim 1, wherein the exhaust gas collecting device is arranged in parallel.   The exhaust collection device for an internal combustion engine according to claim 2, wherein the container has a guide portion for guiding the exhaust gas in the plurality of annular flow paths to one open end of the cylindrical body.   The exhaust collection device for an internal combustion engine according to any one of claims 1 to 3, wherein the container is arranged so that an axis of the cylindrical body is parallel to a crankshaft of the internal combustion engine. .   5. The internal combustion engine according to claim 1, wherein the plurality of exhaust flow paths include a plurality of branch pipes that connect the plurality of annular flow paths and the plurality of exhaust ports. Engine exhaust collecting device.   6. The exhaust gas collecting apparatus for an internal combustion engine according to claim 5, wherein the plurality of branch pipes are juxtaposed in a direction perpendicular to the crankshaft of the internal combustion engine.   The cylindrical body is provided on the downstream side of the exhaust gas purifying device, with a silencer for reducing exhaust noise, an exhaust heat recovery device for recovering heat of exhaust gas and heating the vehicle interior, and direct heat energy of the exhaust gas. The exhaust gas collecting device for an internal combustion engine according to any one of claims 1 to 6, wherein the exhaust gas collecting device is connected in communication with at least one device of a thermoelectric power generating device that converts electric energy.

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