Exhaust purification device for internal combustion engine

Abstract

Provided is an exhaust purification device which is for an internal combustion engine and is useful for improving exhaust purification performance.　A catalyst 34 and a particulate filter 38 are disposed inside a pipe 32, exhaust gas is introduced from an introduction part 3210 of the pipe 32, the catalyst 34 is disposed in a direction orthogonal to the extension direction of the pipe 34 on one side in the extension direction of the pipe 34, and the particulate filter 38 is disposed facing the extension direction of the pipe 32 on the other side from the catalyst 34 in the extension direction of the pipe 32. Since the circulation direction of the exhaust gas is not curved on the upstream side of the catalyst 34 or inside of the catalyst 34, the exhaust gas uniformly flows into the catalyst 34 without bias, and the exhaust gas passing through the catalyst 34 is guided downstream of the catalyst 34 by the pipe 32 to flow into the particulate filter 38.

Description

Exhaust gas purification device for internal combustion engines

[0001] The present invention relates to an exhaust gas purification device for an internal combustion engine.

[0002] A known exhaust purification device provided in the exhaust system of an internal combustion engine includes a catalyst, a particulate filter disposed downstream of the catalyst, and a cylindrical casing that houses the catalyst and the particulate filter. One such exhaust purification device has been proposed in which exhaust gas emitted from the internal combustion engine is introduced into the catalyst through an exhaust pipe that is bent relative to the casing (see Patent Document 1).

[0003] JP 2018-76854 A

[0004] In the above-mentioned conventional technology, the flow direction of the exhaust gas is bent upstream of the catalyst, so that the exhaust gas flows more to the outside of the bent portion than to the inside, making it difficult for the exhaust gas to flow evenly into the catalyst, which is disadvantageous in terms of fully demonstrating the performance of the catalyst. The present invention has been made in light of these circumstances, and its object is to provide an exhaust gas purification device for an internal combustion engine that is advantageous in terms of improving exhaust gas purification performance.

[0005] In order to achieve the above object, one embodiment of the present invention is characterized in that it has a cylinder that houses a catalyst and a particulate filter, an inlet portion for introducing exhaust gas is formed at one end of a side surface of the cylinder that is a surface facing a direction perpendicular to the extending direction of the cylinder, the catalyst is arranged on one side of the extending direction of the cylinder facing a direction perpendicular to the extending direction of the cylinder, and the particulate filter is arranged on the other side of the catalyst in the extending direction so as to face the extending direction. Another embodiment of the present invention is characterized in that a stirring portion is provided between the catalyst and the particulate filter. Another embodiment of the present invention is characterized in that the cylinder extends in the vertical direction on the exhaust-side side surface of the engine body, and an exhaust manifold is located on the side surface of the cylinder between the catalyst and the particulate filter, and the exhaust manifold is arranged so as to be adjacent to the cylinder. In addition, one embodiment of the present invention is characterized in that a heat protector is provided to cover the periphery of the tube to protect against heat damage, and an opening is provided in the heat protector adjacent to the exhaust manifold to expose the side surface of the tube.

[0006] According to one embodiment of the present invention, the flow direction of the exhaust gas is not bent upstream of the catalyst or inside the catalyst, so the exhaust gas flows into the catalyst evenly without being biased, and the exhaust gas that has passed through the catalyst is guided downstream of the catalyst by the tube and flows into the particulate filter, so the exhaust gas is efficiently introduced into the catalyst, which is advantageous for fully demonstrating the performance of the catalyst and for improving the exhaust purification performance of the exhaust purification device. Furthermore, if an agitation section is provided between the catalyst and the particulate filter, the exhaust gas is dispersed approximately evenly by the agitation section and introduced into the particulate filter, so the exhaust gas is efficiently introduced into the particulate filter, which is advantageous for fully demonstrating the performance of the particulate filter and is further advantageous for improving the exhaust purification performance of the exhaust purification device. Furthermore, if the cylinder extends in the vertical direction on the exhaust-side side surface of the engine body, the exhaust manifold is located at a position on the side surface of the cylinder that is located between the catalyst and the particulate filter, and the exhaust manifold is arranged adjacent to the cylinder, the exhaust gas introduced into the particulate filter can be heated by heat radiated from the exhaust manifold and transferred to the side surface of the cylinder, and a temperature drop in the particulate filter can be suppressed, which is advantageous for efficiently performing regeneration processing of the particulate filter. Furthermore, if an opening that exposes the side surface of the cylinder is provided in a position adjacent to the exhaust manifold in a heat protector that is provided to cover the periphery of the cylinder, the heat radiated from the exhaust manifold is directly transferred to the side surface of the cylinder through the opening, which is more advantageous for efficiently heating the exhaust gas introduced into the particulate filter and more advantageous for suppressing a temperature drop in the particulate filter, which is even more advantageous for efficiently performing regeneration processing of the particulate filter.

[0007] 1 is a side cross-sectional view of an internal combustion apparatus to which an exhaust purification device according to an embodiment is applied, as seen from one side in a vehicle width direction; FIG. 2 is a side view of the exhaust purification device according to an embodiment, as seen from the other side in a vehicle width direction; and FIG. 3 is a front view of the exhaust purification device according to an embodiment, as seen from the front of the vehicle.

[0008] Next, an embodiment of the present invention will be described with reference to the drawings. In the following drawings, the symbol FR indicates the front of the vehicle, the symbol RH indicates the vehicle width direction, and the symbol UP indicates the top of the vehicle. The upstream and downstream sides are defined based on the exhaust flow direction. In this embodiment, the internal combustion engine is a diesel engine fueled by diesel oil, but the present invention is of course also applicable to a gasoline engine fueled by gasoline.

[0009] 1, the internal combustion engine 10 includes an engine body 12, a supercharger 14, an exhaust gas purification device 16, and an engine ECU (not shown) that controls the engine body 12 and the supercharger 14. In this embodiment, the internal combustion engine 10 is disposed in a space in front of the vehicle in front of the dash panel. The engine body 12 includes a cylinder head 1202 in which a combustion chamber is formed, and a cylinder block 1204 connected to the lower part of the cylinder head 1202. A valve train 1206 that operates the intake valves and exhaust valves is provided above the cylinder head 1202.

[0010] In this embodiment, the internal combustion engine 10 is mounted on a vehicle so that the crankshaft faces the fore-and-aft direction of the vehicle, and one side surface of the cylinder head 1202 facing in the vehicle width direction constitutes an intake-side side surface (not shown) to which an intake manifold (not shown) that supplies intake air to each cylinder chamber is connected. The other side surface of the cylinder head 1202 facing in the vehicle width direction constitutes an exhaust-side side surface 1210 to which an exhaust manifold 18 (see FIG. 2) that discharges exhaust gas from each cylinder chamber is connected. As shown in FIG. 1, a downstream end 1802 of the exhaust manifold 18 is connected to a first turbine housing 20A of a first supercharger 20 of the supercharger 14.

[0011] As shown in Fig. 1, the supercharger 14 is a two-stage turbocharger and includes a first supercharger 20 and a second supercharger 22 that is connected to the first supercharger 20 and has a larger capacity than the first supercharger 20. In this embodiment, the supercharger 14 is provided close to the exhaust side surface 1210 of the engine body 12. The second supercharger 22 is arranged next to the first supercharger 20 in the up-down direction. Here, if the direction in which the rotation shaft of the supercharger extends is referred to as the axial direction of the supercharger, in this embodiment, the first supercharger 20 and the second supercharger 22 are arranged with their axial directions oriented approximately in the fore-and-aft direction of the vehicle and their axial directions approximately parallel to each other.

[0012] As shown in FIG. 1 , the first turbocharger 20 includes a first turbine wheel (not shown), a first turbine housing 20A, a first compressor wheel (not shown), a first compressor housing 20B, a first rotating shaft (not shown), and a first bearing housing 20C. The first turbine housing 20A is connected to a downstream end 1802 of the exhaust manifold 18 that constitutes the exhaust passage and houses the first turbine wheel. The first compressor housing 20B is connected to the intake manifold via a second intake pipe 24B and an intercooler (not shown) and houses the first compressor wheel. The first bearing housing 20C connects the first turbine housing 20A and the first compressor housing 20B. The first turbine wheel and the first compressor wheel are connected by a first rotating shaft, and the first bearing housing 20C supports the first rotating shaft via a bearing. Therefore, the first turbine wheel is rotated by the exhaust gas discharged from the exhaust manifold 18, which in turn rotates the first compressor wheel via the first rotating shaft, thereby pressurizing the intake air supplied from the second compressor housing 22B described later via the intake side connection passage 28 to the intake manifold via the second intake pipe 24B and an intercooler not shown.

[0013] 1 , the second turbocharger 22 includes a second turbine wheel (not shown), a second turbine housing 22A, a second compressor wheel (not shown), a second compressor housing 22B, a second rotating shaft (not shown), and a second bearing housing 22C. The second turbine housing 22A is connected to the first turbine housing 20A via an exhaust-side connecting passage 30 and houses the second turbine wheel, and an outlet 2202 of the exhaust pipe of the second turbine housing 22A is directly connected to an inlet 3210 of the exhaust purification device 16 (described later). The second compressor housing 22B is connected to an air cleaner (not shown) via a first intake pipe 24A and is connected to the first compressor housing 20B via an intake-side connecting passage 28 and houses the second compressor wheel. The second bearing housing 22C connects the second turbine housing 22A and the second compressor housing 22B, and the second turbine wheel and the second compressor wheel are connected by a second rotating shaft, which is supported by the second bearing housing 22C via a bearing. Therefore, the second turbine wheel is rotationally driven by exhaust gas supplied from the first turbine housing 20A via the exhaust-side connecting passage 30, which in turn rotates the second compressor wheel via the second rotating shaft, thereby causing intake air introduced from the air cleaner via the first intake pipe 24A to be pressurized and sent from the second compressor housing 22B via the intake-side connecting passage 28 to the first compressor housing 20B.

[0014] The supercharger 14 is provided with a plurality of bypass passages and a plurality of bypass valves (not shown) for switching the supercharging operation by the first supercharger 20 and the second supercharger 22, and the bypass valves are controlled so that supercharging is efficiently performed by the small-capacity first supercharger 20 in the low to medium rotation range of the engine body 12, and the bypass valves are controlled so that supercharging is efficiently performed by the large-capacity second supercharger 22 in the medium to high rotation range. The configurations of such bypass passages and each bypass valve and the control of each bypass valve can use various conventionally known configurations and controls of two-stage turbochargers, and detailed description thereof will be omitted as they are not directly related to the present invention.

[0015] 1 , the exhaust purification device 16 is disposed on the exhaust side surface 1210 of the engine body 12, rearward of the first turbocharger 20 and the second turbocharger 22 in the vehicle longitudinal direction. The exhaust purification device 16 includes a cylinder 32 constituting a casing, a catalyst 34 housed in the cylinder 32, an agitation section 36 (mixing plate), a particulate filter 38, and a heat protector 40.

[0016] The cylinder 32 is configured as a vertically elongated member made of a metal material such as stainless steel. In other words, the cylinder 32 extends in the vertical direction, from the second turbocharger 22 side to the first turbocharger 20 side, and the cylinder 32, the second turbine housing 22A of the second turbocharger 22, and the first turbine housing 20A of the first turbocharger 20 are arranged adjacent to each other in the vehicle longitudinal direction. In other words, the exhaust gas purification device 16, the first turbocharger 20, and the second turbocharger 22 are arranged close to each other in the vehicle longitudinal direction. In this embodiment, as shown in Figures 1 and 3, the cylinder 32 is formed in a substantially cylindrical shape that is vertically elongated and whose axis extends in the vertical direction, and whose upper and lower ends are closed. An inlet portion 3210, which is an opening through which exhaust gas is introduced, is formed at one end of the tube 32 in the extension direction, which is the upper end of the tube 32 in this embodiment, and an outlet portion 3212, which is an opening through which exhaust gas is discharged, is formed at the other end of the tube 32 in the extension direction, which is the lower end of the tube 32 in this embodiment. The inlet portion 3210 is provided at one end (upper end) of the tube 32 in the extension direction on the side surface 3204, which is a surface facing in a direction perpendicular to the extension direction of the tube 32. The outlet portion 3212 is provided at the tube bottom portion 32C, which is a surface facing in the extension direction of the tube 32, at the other end (lower end) of the tube 32 in the extension direction. The inlet portion 3210 faces forward of the vehicle. 1 , the exhaust gas flows from the upstream side of the cylinder 32 to the downstream side of the exhaust pipe 2202. The ... catalyst 34. The exhaust gas flows from the upstream side of the cylinder 32 to the downstream side of the catalyst 34. The exhaust gas flows from the upstream side of the cylinder 32 to the downstream side of the catalyst 34. The exhaust gas flows from the upstream side of the cylinder

[0017] As shown in FIG. 1 , the catalyst 34 and the particulate filter 38 are disposed within the cylinder 32. As shown in FIGS. 1 and 3 , the catalyst 34 has a flat, cylindrical shape and is attached to the top of the cylinder 32. The catalyst 34 is disposed with its axis oriented in the vehicle longitudinal direction, with the axis of the catalyst 34 and the axis of the inlet 3210 substantially aligned. The portion of the catalyst 34 located in front of the vehicle is formed as a substantially flat front end surface 3402 extending on an imaginary plane perpendicular to the vehicle longitudinal direction, while the portion of the catalyst 34 located in the rear of the vehicle is formed as a substantially flat rear end surface 3404 extending on an imaginary plane perpendicular to the vehicle longitudinal direction. The front end surface 3402 is disposed to face the inlet 3210. Exhaust gas passes from the outlet 2202 of the exhaust pipe section of the second turbine housing 22A through the inlet 3210, impinges on the front end surface 3402 of the catalyst 34 substantially perpendicularly, and passes through the catalyst 34 along the axial direction of the catalyst 34 to be purified. As shown in FIG. 1, the exhaust gas that has passed through the catalyst 34 passes through a flow path 42, which is the space between a rear end surface 3404 of the catalyst 34 and the rear side surface 3204 of the cylinder 32, and is guided below the cylinder main body 32A.

[0018] As shown in Fig. 1, the stirring section 36 is provided between the catalyst 34 and the particulate filter 38, in other words, it is disposed in the middle in the extending direction of the cylinder 32. The stirring section 36 stirs the exhaust gas and is a section where an additive injected via an injector (not shown) is efficiently mixed into the exhaust gas that has passed through the catalyst 34, and as shown in Fig. 3, it is attached to the inner surface of the cylinder main body 32A of the cylinder 32. As shown in Fig. 1, the exhaust gas is dispersed approximately evenly by passing through the stirring section 36 and is introduced into the upstream end surface 3802 of the particulate filter 38.

[0019] As shown in FIG. 1 , the particulate filter 38 has a cylindrical shape and is disposed at the bottom of the cylinder 32 with its axis substantially aligned with the axis of the cylinder 32. Therefore, the particulate filter 38 is disposed downstream of the catalyst 34 and the stirring section 36 so as to face in the extending direction of the cylinder 32. Explaining in detail, as shown in FIG. 3 , the particulate filter 38 is attached to the inner surface of the cylinder main body 32A with its upstream end face 3802 facing upward and its downstream end face 3804 facing downward. Furthermore, as shown in FIG. 1 , the particulate filter 38 and the catalyst 34 are disposed within the cylinder 32 so that the catalyst 34 is positioned on the axis of the particulate filter 38, thereby making the exhaust gas purification device 16 more compact. The catalyst 34 is formed so that the length of the catalyst 34 in the front-rear direction is equal to or less than the diameter of the particulate filter 38 in the front-rear direction, so that the entire catalyst 34 overlaps with the particulate filter 38 when viewed from the top-bottom direction. This is advantageous in arranging the catalyst 34 and the particulate filter 38 in close proximity to the first turbine housing 20A of the first supercharger 20 and the second turbine housing 22A of the second supercharger 22 in the longitudinal direction of the vehicle.

[0020] As shown in FIG. 2 , the cylinder 32 extends in the vertical direction on the exhaust-side side surface 1210 of the engine body 12, and the exhaust manifold 18 extends in the longitudinal direction of the vehicle at a position adjacent to a portion of the side surface 3204 of the cylinder 32 that is located between the catalyst 34 and the particulate filter 38. That is, the exhaust manifold 18 is located at a portion of the side surface 3204 of the cylinder 32 that is located between the catalyst 34 and the particulate filter 38. As shown in FIGS. 1 , 2 , and 3 , the heat protector 40 shields the exhaust gas purifier 16 from heat radiation. Specifically, the heat protector 40 prevents heat damage to the surrounding area caused by heat radiated from the exhaust gas purifier 16, and at the same time, prevents a decrease in the temperature of the exhaust gas flowing through the exhaust gas purifier 16 that occurs when the exhaust gas purifier 16 is exposed to the outside air and loses heat. In this embodiment, the heat protector 40 is configured to include stainless steel outer plates (not shown) and a heat insulating material such as a glass wool mat provided on the inner surface of the outer plates, but various conventionally known configurations, such as an outer plate made of a synthetic resin material, can be used for the heat protector 40. As shown in Figures 2 and 3, a horizontally elongated opening 4002 is provided in the heat protector 40 adjacent to the exhaust manifold 18, exposing the side surface of the tube 32 in the fore-and-aft direction of the vehicle.

[0021] As shown in FIG. 1, the exhaust gas purified by passing through the catalyst 34 has an additive added by an injector to remove nitrogen oxides (NOx), and then passes through a particulate filter 38 to remove particulate matter, before being discharged into the atmosphere via the exhaust pipe 26.

[0022] When the internal combustion engine 10 is a diesel engine as in the present embodiment, an oxidation catalyst (DOC) that purifies exhaust gas is used as the catalyst 34, a diesel particulate filter (DPF) is used as the particulate filter 38, and urea water or the like is used as the additive.

[0023] Furthermore, since the catalyst 34 performs well when its temperature rises to its activation temperature, it is preferable that the catalyst 34 be maintained at a somewhat high temperature so as not to lower the temperature of the catalyst 34. Furthermore, the particulate filter 38 needs to be regenerated by burning and removing particulates that have accumulated on the particulate filter 38 so as not to become clogged with particulates. The regeneration process for the particulate filter 38 is carried out by a conventionally known method, such as operating the engine body 12 in such a way that the temperature of the exhaust gas rises or supplying unburned gas to the catalyst 34, but in order to efficiently carry out the regeneration process for the particulate filter 38, it is preferable that the temperature of the particulate filter 38 be maintained at a somewhat high temperature so as not to lower the temperature.

[0024] Next, the operation of the internal combustion engine 10 will be described. As shown in FIG. 1 , when the engine body 12 is operating, as indicated by the solid arrows in the figure, exhaust gas discharged from the engine body 12 is supplied from the exhaust manifold 18 to the first turbine housing 20A, thereby rotating the first turbine wheel, and then to the second turbine housing 22A, thereby rotating the second turbine wheel. The exhaust gas is then introduced into the inlet 3210 of the exhaust purification device 16 from the outlet 2202 of the exhaust pipe of the second turbine housing 22A. That is, the exhaust gas is introduced into the inlet 3210 from the upstream side surface 3204A of the cylinder 32 in a direction perpendicular to the extension direction of the cylinder 32, and passes through the catalyst 34 in a direction substantially perpendicular to the front end surface 3402 of the catalyst 34. The exhaust gas flowing out from the rear end surface 3404 of the catalyst 34 is guided downward by the flow passage 42, where an additive is added by the injector and the exhaust gas is stirred by the stirring section 36, thereby being substantially uniformly dispersed and then guided toward the particulate filter 38. The exhaust gas is dispersed approximately evenly across the upstream end face 3802 of the particulate filter 38, passes through the particulate filter 38 in a direction approximately perpendicular to the upstream end face 3802 of the particulate filter 38, and is discharged into the atmosphere from the downstream end face 3804 of the particulate filter 38 via the exhaust pipe 26.

[0025] According to the present embodiment, the catalyst 34 and the particulate filter 38 are disposed within the cylinder 32, the exhaust gas is introduced from the inlet portion 3210 of the cylinder 32, the catalyst 34 is disposed on one side of the extending direction of the cylinder 34 and facing a direction perpendicular to the extending direction of the cylinder 34, and the particulate filter 38 is disposed on the other side of the catalyst 34 in the extending direction of the cylinder 32 and facing the extending direction of the cylinder 32. Therefore, the flow direction of the exhaust gas is not bent upstream of the catalyst 34 or inside the catalyst 34, so the exhaust gas flows evenly without being biased toward the catalyst 34, and the exhaust gas that has passed through the catalyst 34 is guided by the cylinder 32 downstream of the catalyst 34 and flows into the particulate filter 38. Therefore, the exhaust gas is efficiently introduced into the catalyst 34, which is advantageous for fully utilizing the performance of the catalyst 34 and for improving the exhaust gas purification performance of the exhaust gas purification device 16.

[0026] Furthermore, in this embodiment, the agitation section 36 is provided between the catalyst 34 and the particulate filter 38, so the exhaust gas is dispersed approximately evenly by the agitation section 36 and introduced into the particulate filter 38. Therefore, the exhaust gas is efficiently introduced into the particulate filter 38, which is advantageous in allowing the particulate filter 38 to fully demonstrate its performance, and is more advantageous in improving the exhaust gas purification performance of the exhaust purification device 16.

[0027] Moreover, in this embodiment, the cylinder 32 extends in the vertical direction on the exhaust-side side surface 1210 of the engine body 12, and the exhaust manifold 18 is located in a side portion of the cylinder 32 located between the catalyst 34 and the particulate filter 38, and the exhaust manifold 18 is disposed adjacent to the cylinder 32. Therefore, heat radiated from the exhaust manifold 18 is transferred to the side portion of the cylinder 32, and the heat transferred to the side surface of the cylinder 32 can heat the exhaust gas introduced into the particulate filter 38, and therefore a decrease in the temperature of the particulate filter 38 can be suppressed, which is advantageous for efficiently performing the regeneration process of the particulate filter 38.

[0028] Furthermore, in this embodiment, a heat protector 40 is provided so as to cover the periphery of the cylinder 32, and an opening 4002 exposing the side surface of the cylinder 32 is provided in a portion of the heat protector 40 adjacent to the exhaust manifold 18. Therefore, heat radiated from the exhaust manifold 18 is directly transferred to the side surface of the cylinder 32 through the opening 4002, which is more advantageous in efficiently heating the exhaust gas introduced into the particulate filter 38 by the heat transferred to the side surface of the cylinder 32. Therefore, it is more advantageous in suppressing a decrease in the temperature of the particulate filter 38, and is even more advantageous in efficiently performing the regeneration process of the particulate filter 38.

[0029] In the present embodiment, the internal combustion engine 10 is a diesel engine and the exhaust gas purification device 16 is provided with an agitation unit 36. However, the agitation unit 36 ​​may be omitted. Although the present embodiment describes the internal combustion engine 10 having two turbochargers, the internal combustion engine 10 may have only one turbocharger, or the present invention may be applied to an internal combustion engine without a turbocharger. Furthermore, when the internal combustion engine 10 is a gasoline engine, a three-way catalyst 34 (TWC) that purifies exhaust gas may be used as the catalyst 34, and a gasoline particulate filter 38 (GPF) may be used as the particulate filter 38. Furthermore, the catalyst 34 and the particulate filter 38 are not limited to those described in the embodiment, and various conventionally known catalysts 34 and particulate filters 38 may be used.

[0030] Furthermore, in the present embodiment, the case of a longitudinally mounted front engine in which the engine body 12 is disposed at the front of the vehicle body has been described. However, depending on the case of a transversely mounted engine, a rear engine in which the engine body 12 is disposed at the rear of the vehicle body, or a midship engine in which the engine body 12 is disposed at the center of the vehicle body, the location and extension direction of the exhaust purification device 16 relative to the engine body 12 may be changed as appropriate, and the locations and arrangement directions of the first supercharger 20 and the second supercharger 22 may also be changed as appropriate. Therefore, the location and extension direction of the exhaust purification device 16 and the locations and arrangement directions of the first supercharger 20 and the second supercharger 22 are not limited to those described in the present embodiment.

[0031] 10 Internal combustion engine 12 Engine body 1202 Cylinder head 1204 Cylinder block 1206 Valve mechanism 1210 Exhaust side surface 14 Supercharging device 16 Exhaust purification device 18 Exhaust manifold 1802 Downstream end 20 First supercharger 20A First turbine housing 20B First compressor housing 20C First bearing housing 22 Second supercharger 22A Second turbine housing 22B Second compressor housing 22C Second bearing housing 2202 Outlet of exhaust pipe section 24A First intake pipe 24B Second intake pipe 26 Exhaust pipe 28 Intake side connecting passage 30 Exhaust side connecting passage 32 Cylinder 32A Cylinder body 32C Cylinder bottom 3202 Cylindrical wall 3204A Flat wall (upstream side surface) 3210 Introduction section 3212 Discharge portion 34 Catalyst 3402 Front end surface 3404 Rear end portion 36 Stirring portion 38 Particulate filter 3802 Upstream end surface 3804 Downstream end surface 40 Heat protector 4002 Opening 42 Flow path portion

Claims

1. a cylinder that houses a catalyst and a particulate filter; an introduction portion for introducing exhaust gas is formed at one end of a side surface of the cylinder, the side surface being a surface facing a direction perpendicular to the extension direction of the cylinder, in the extension direction; The catalyst is disposed on one side of the extending direction of the cylinder and facing in a direction perpendicular to the extending direction of the cylinder, the particulate filter is disposed on the other side of the catalyst in the extending direction so as to face the extending direction, The cylinder extends in the vertical direction on the exhaust side of the engine body, an exhaust manifold is located on the side surface of the cylinder at a location between the catalyst and the particulate filter, The exhaust manifold is disposed adjacent to the cylinder. An exhaust gas purification device for an internal combustion engine.

2. an agitation section is provided between the catalyst and the particulate filter; 2. An exhaust gas purification device for an internal combustion engine according to claim 1.

3. A heat protector is provided to cover the cylinder to protect it from heat damage. an opening for exposing the side surface of the cylinder is provided at a location of the heat protector adjacent to the exhaust manifold; 2. An exhaust gas purification device for an internal combustion engine according to claim 1.