WO2020170975A1

WO2020170975A1 - Exhaust manifold

Info

Publication number: WO2020170975A1
Application number: PCT/JP2020/005834
Authority: WO
Inventors: 大智澁谷
Original assignee: いすゞ自動車株式会社
Priority date: 2019-02-20
Filing date: 2020-02-14
Publication date: 2020-08-27
Also published as: JP2020133509A; CN113454317A

Abstract

This exhaust manifold comprises: first inlet ports 31B through which exhaust discharged from an engine 10 is let in; first passage parts 31, 32, 33 that extend from the first inlet ports 31B and allow exhaust taken in from the first inlet ports 31B to flow through; a first outlet port 33B that is provided to exit parts of the first passage parts 31, 32, 33 and that lets exhaust flowing through the first passage parts 31, 32, 33 out to another exhaust system device 60; a second inlet port 36B that lets in exhaust flowing through the other exhaust system device 60; second passage parts 35, 36, 37 that extend from the second inlet port 36B and allow exhaust taken in from the second inlet port 36B to flow through; a second outlet port 37B that is provided to exit parts of the second passage parts 35, 36, 37 and that lets out exhaust flowing through the second passage parts 35, 36, 37; and a bypass passage part 38 connecting the first passage part 32 and the second passage part 36 so that exhaust flowing through the first passage parts 31, 32, 33 bypasses the other exhaust system device 60.

Description

Exhaust manifold

The present disclosure relates to an exhaust manifold, and particularly to an exhaust manifold of an engine including a supercharger.

As a technology for increasing the output of an engine, a supercharger that includes a turbine driven by exhaust gas and a compressor that is provided coaxially with the turbine and pumps intake air is widely used. For example, Patent Document 1 discloses a two-stage supercharging system in which a high-pressure supercharger and a low-pressure supercharger are arranged and attached vertically on the side of an exhaust manifold.

Japanese Patent Laid-Open No. 2012-12988

Generally, it is desirable to make exhaust system devices such as exhaust manifolds and turbochargers attached to the engine compact in terms of space restrictions in the engine room and improving mountability.

In the structure described in Patent Document 1, the exhaust manifold and the housings of the high pressure supercharger and the low pressure supercharger are configured separately. Therefore, the exhaust system structure including the high-pressure supercharger and the low-pressure supercharger becomes large as a whole, which may cause interference with peripheral parts and deterioration of mountability.

The purpose of the present disclosure is to provide an exhaust manifold capable of achieving a compact exhaust system structure.

The exhaust manifold of the present disclosure includes a first inlet port for introducing exhaust gas discharged from an engine, a first passage portion extending from the first inlet port for circulating the exhaust gas taken in from the first inlet port, A first outlet provided at an outlet of the first passage portion for leading out exhaust gas flowing through the first passage portion to another exhaust system device; and a first outlet port for introducing exhaust gas flowing through the other exhaust system device 2 introduction port, a second passage portion that extends from the second introduction port and allows the exhaust gas taken in from the second introduction port to flow, and an outlet portion of the second passage portion. A second outlet for discharging the exhaust flowing through the bypass passage, and a bypass passage connecting the first passage and the second passage so that the exhaust flowing through the first passage bypasses the other exhaust system device. And a section.

The first outlet and the second inlet are provided in a flange portion to which the other exhaust system device is attached, and the first passage portion extends from the first inlet to the first outlet. And a second passage portion extending obliquely from the second introduction port to the engine side, and the bypass passage is provided. It is preferable that the portion obliquely extends from the first passage portion toward the second passage portion.

Further, it is preferable that the bypass passage portion is provided with a valve capable of opening and closing the flow passage of the bypass passage portion, and an actuator for operating the valve is arranged closer to the engine than the bypass passage portion. ..

Further, it is preferable that a turbine of the supercharger is arranged in the second passage portion and a turbine housing for accommodating the turbine is integrally provided.

The other exhaust system device is a high-pressure stage supercharger having a high-pressure stage turbine that is rotationally driven by the exhaust gas taken in from the first outlet, and the turbine provided in the second passage is a low-pressure stage supercharger. The low pressure turbine of the machine is preferred.

According to the exhaust manifold of the present disclosure, the exhaust system structure can be made compact.

FIG. 1 is a schematic overall configuration diagram showing an intake system and an exhaust system of an engine according to an embodiment. FIG. 2 is a schematic perspective view showing the exhaust manifold according to the embodiment. FIG. 3 is a schematic side view of a state in which the high-pressure stage turbine housing is attached to the fixed flange portion of the exhaust manifold according to the embodiment, viewed from the longitudinal direction of the exhaust gas collecting portion.

An exhaust manifold according to an embodiment will be described below with reference to the accompanying drawings. The same parts are designated by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[overall structure]
FIG. 1 is a schematic overall configuration diagram showing an intake system and an exhaust system of an engine 10 according to this embodiment.

The engine 10 mainly includes an engine body 11 including a cylinder block and a cylinder head CH and the like provided above the cylinder block. In the cylinder block, a plurality of cylinders C that partition the combustion chamber are provided in series in the longitudinal direction of the engine 10. The cylinder head CH is provided with an intake port 12 for introducing intake air into the cylinder C and an exhaust port 13 for exhausting exhaust gas from the cylinder C. The engine 10 is not limited to the illustrated in-line multi-cylinder engine, and may be a single-cylinder engine. Further, the engine 10 may be a V-type engine, a horizontally opposed engine, or the like.

An intake manifold 20 that distributes intake air to each intake port 12 is provided on the intake side of the cylinder head CH. The intake manifold 20 includes an air cleaner 21, a first intake pipe 22, a low-pressure compressor housing 45 of the low-pressure supercharger 40, a second intake pipe 23, and a high-pressure compressor of the high-pressure supercharger 60 in order from the intake upstream side. The housing 80 and the third intake pipe 24 are connected. The third intake pipe 24 is provided with an intercooler 25 that cools intake air.

An exhaust manifold 30 is provided on the exhaust side of the cylinder head CH. The exhaust manifold 30 includes a plurality of exhaust introduction passage portions 31 (a part of the first passage portion) connected to the outlet portions of the exhaust ports 13 and an exhaust collecting portion 32 (first exhaust passage portion 31) where the exhaust introduction passage portions 31 merge. A portion of the passage portion) and an exhaust derivation passage portion 33 (a portion of the first passage portion) that guides the exhaust gas from the exhaust gas collecting portion 32. Further, the exhaust manifold 30 is integrally provided with a low pressure turbine housing 34 of the low pressure supercharger 40.

The low-pressure supercharger 40 includes a low-pressure turbine 41, a low-pressure compressor 42, a rotary shaft 43 that connects the low-pressure turbine 41 and the low-pressure compressor 42, and a bearing (not shown) that pivotally supports the rotary shaft 43. It has and. The low-pressure turbine 41 is housed in a low-pressure turbine housing 34 formed integrally with the exhaust manifold 30. The low pressure compressor 42 is housed in a low pressure compressor housing 45. A bearing housing 46 that accommodates bearings is provided between the low-pressure turbine housing 34 and the low-pressure compressor housing 45. The low pressure supercharger 40 is not limited to the conventional type shown in the figure, and may be a variable capacity type having variable blades.

The low-pressure compressor housing 45 is provided with a low-pressure intake scroll passage 47 that extends circumferentially around the low-pressure compressor 42. Further, the low pressure stage compressor housing 45 is provided with a low pressure stage suction passage portion 48 for sucking intake air into the low pressure stage intake scroll passage 47. Further, the low pressure stage compressor housing 45 is provided with a low pressure stage discharge passage portion 49 that discharges intake air from the low pressure stage intake scroll passage 47. The first intake pipe 22 is connected to the low pressure stage intake passage portion 48, and the second intake pipe 23 is connected to the low pressure stage discharge passage portion 49.

The low pressure turbine housing 34 formed integrally with the exhaust manifold 30 is provided with a low pressure exhaust scroll passage 35 (a part of the second passage portion) that extends in the circumferential direction around the low pressure turbine 41. Further, the exhaust manifold 30 is provided with a low pressure stage exhaust introduction passage portion 36 (a part of the second passage portion) for introducing exhaust gas into the low pressure stage exhaust scroll passage 35. Further, the exhaust manifold 30 is provided with a low-pressure stage exhaust lead-out passage portion 37 (a part of the second passage portion) that leads the exhaust gas from the low-pressure stage exhaust scroll passage 35. An exhaust pipe 27 is connected to the low-pressure stage exhaust derivation passage portion 37, and a casing 29 of an exhaust purification device 28 and the like are connected to the exhaust pipe 27. In the casing 29, for example, an oxidation catalyst, a particulate filter, a NOx catalyst, etc. are accommodated.

Further, the exhaust manifold 30 has a bypass passage portion 38 that connects the exhaust collecting portion 32 and the low pressure exhaust scroll passage 35 so that the exhaust gas discharged from the exhaust collecting portion 32 bypasses the high pressure supercharger 60. It is provided. The bypass passage portion 38 is provided with a bypass valve 90 capable of opening and closing the flow passage of the bypass passage portion 38. The bypass valve 90 is operated by an actuator 91 (for example, a diaphragm type or electromagnetic type actuator). The bypass valve 90 may be either a valve whose opening can be adjusted linearly or an ON/OFF valve.

The low pressure supercharger 40 configured as described above has a low pressure stage when the exhaust gas is introduced into the low pressure stage exhaust scroll passage 35 from at least one of the low pressure stage exhaust introduction passage portion 36 and the bypass passage portion 38. As the turbine 41 rotates, the low pressure stage compressor 42 is driven to rotate. When the low-pressure compressor 42 is rotationally driven, intake air is taken into the low-pressure intake scroll passage 47 from the first intake pipe 22 via the low-pressure intake passage portion 48, so that the intake air pressurized by the low-pressure compressor 42 is reduced in pressure. The stage discharge passage portion 49 is configured to be pressure-fed to the second intake pipe 23.

The high pressure supercharger 60 (an example of another exhaust system device) includes a high pressure turbine 61, a high pressure compressor 62, a rotary shaft 63 connecting the high pressure turbine 61 and the high pressure compressor 62, and a rotary shaft. And a bearing (not shown) that axially supports 63. The high pressure stage turbine 61 is housed in a high pressure stage turbine housing 70. The high pressure compressor 62 is housed in a high pressure compressor housing 80. A bearing housing 88 that accommodates a bearing is provided between the high pressure turbine housing 70 and the high pressure compressor housing 80. The high pressure supercharger 60 is not limited to the conventional type shown in the drawing, but may be a variable capacity type having variable blades.

The high-pressure compressor housing 80 is provided with a high-pressure intake scroll passage 81 extending circumferentially around the high-pressure compressor 62. Further, the high-pressure stage compressor housing 80 is provided with a high-pressure stage suction passage portion 82 that sucks intake air into the high-pressure stage intake scroll passage 81. Further, the high pressure stage compressor housing 80 is provided with a high pressure stage discharge passage portion 83 for discharging intake air from the high pressure stage intake scroll passage 81. The second intake pipe 23 is connected to the high pressure stage intake passage portion 82, and the third intake pipe 24 is connected to the high pressure stage discharge passage portion 83.

The high-pressure stage turbine housing 70 is provided with a high-pressure stage exhaust scroll passage 71 extending circumferentially around the high-pressure stage turbine 61. Further, the high pressure stage turbine housing 70 is provided with a high pressure stage exhaust introduction passage portion 72 for introducing exhaust gas into the high pressure stage exhaust scroll passage 71. Further, the high-pressure stage turbine housing 70 is provided with a high-pressure stage exhaust derivation passage portion 73 that guides exhaust gas from the high-pressure stage exhaust scroll passage 71. The high-pressure stage exhaust introduction passage portion 72 is connected to the exhaust derivation passage portion 33 of the exhaust manifold 30. The low pressure stage exhaust introduction passage portion 36 of the exhaust manifold 30 is connected to the high pressure stage exhaust gas outlet passage portion 73.

In the high pressure supercharger 60 configured as described above, when exhaust gas is introduced into the high pressure exhaust scroll passage 71 from the exhaust outlet passage 33 through the high pressure exhaust introduction passage 72, the high pressure turbine 71 is installed. Is rotated, the high-pressure compressor 72 is driven to rotate. When the high-pressure compressor 72 is rotationally driven, the intake air is taken into the high-pressure intake scroll passage 81 from the second intake pipe 23 via the high-pressure intake passage portion 82, so that the intake pressure pressurized by the high-pressure compressor 62 becomes high. The stage discharge passage 83 is configured to be pressure-fed to the third intake pipe 24.

[Exhaust manifold]
FIG. 2 is a schematic perspective view showing the exhaust manifold 30 according to the present embodiment.

As shown in FIG. 2, the exhaust manifold 30 has a plurality of exhaust introduction passage portions 31, an exhaust collecting portion 32, an exhaust derivation passage portion 33, and a low-pressure stage exhaust scroll passage 35 (see FIG. 1) formed therein. The low-pressure stage turbine housing 34, the low-pressure stage exhaust introduction passage portion 36, the low-pressure stage exhaust discharge passage portion 37, and the bypass passage portion 38 are integrally provided.

The exhaust introduction passage portions 31 are provided in the number corresponding to the number of cylinders of the engine 10, and extend in the direction (lateral direction) orthogonal to the cylinder arrangement direction of the engine 10. A fixed flange portion 31A, which is fastened and fixed to a side portion of the cylinder head CH by a bolt or the like (not shown), is provided at an inlet end of each exhaust introduction passage portion 31. Further, the fixed flange portion 31A is provided with a first exhaust introduction port 31B (first introduction port) that opens toward the exhaust port 13 (see FIG. 1) of the cylinder head CH, respectively.

The exhaust collecting portion 32 extends parallel to the cylinder arrangement direction of the engine 10, and the outlet ends of the exhaust introducing passage portions 31 join together. That is, the exhaust gas introduced from each exhaust port 13 (see FIG. 1) of the engine 10 into the exhaust gas introduction passage portion 31 flows in the exhaust gas collecting portion 32 in the longitudinal direction to join together.

The exhaust gas outlet passage portion 33 branches from the exhaust gas collecting portion 32 and extends laterally on the side opposite to the exhaust gas inlet passage portion 31. A low pressure turbine housing 34 is provided immediately above the exhaust gas outlet passage portion 33. A fixed flange portion 39 for mounting the high-pressure turbine housing 70 (see FIG. 1) is provided at the outlet end of the exhaust gas outlet passage portion 33. The flange surface 39A of the fixed flange portion 39 is provided with a first exhaust outlet port 33B (first outlet port) that opens toward the high pressure stage exhaust gas introduction passage portion 72 (see FIG. 1) of the high pressure turbine housing 70. There is. That is, the exhaust flowing from the exhaust collecting portion 32 into the exhaust gas outlet passage portion 33 is configured to be introduced into the high pressure stage exhaust gas inlet passage portion 72 (see FIG. 1) via the first exhaust gas outlet port 33B. ..

In the present embodiment, the fixed flange portion 39 is provided so as to be inclined at a predetermined angle with respect to the axial center of the exhaust lead-out passage portion 33 so that the flange surface 39A faces obliquely downward. That is, the high-pressure turbine housing 70 (see FIG. 1) is arranged obliquely below the low-pressure turbine housing 34 above the exhaust derivation passage portion 33. On the flange surface 39A of the fixed flange portion 39, a second exhaust introduction port 36B (second introduction port) for introducing exhaust gas from the high-pressure stage exhaust derivation passage portion 73 (see FIG. 1) is provided more than the first exhaust derivation port 33B. An opening is formed on the upper side.

The low-pressure stage exhaust introduction passage portion 36 extends obliquely upward from the second exhaust introduction port 36B of the fixed flange portion 39 toward the low-pressure stage turbine housing 34. The outlet end of the low-pressure turbine housing 34 joins the low-pressure exhaust scroll passage 35 (see FIG. 1) in the low-pressure turbine housing 34. Further, the low-pressure stage turbine housing 34 is provided with a low-pressure stage exhaust lead-out passage portion 37 that leads out exhaust gas from the low-pressure stage exhaust scroll passage 35. A low-pressure stage flange portion 37A for fixing an exhaust pipe or the like (not shown) is provided at the outlet end of the low-pressure stage exhaust outlet passage portion 37, and the second exhaust outlet port 37B is provided on the flange surface of the low-pressure stage flange portion 37A. The (second outlet) is formed as an opening.

That is, the exhaust manifold 30 includes a plurality of first exhaust gas inlet ports 31B for directly introducing exhaust gas from the engine 10, and a first exhaust gas outlet port 33B for discharging exhaust gas to the high-pressure turbine housing 70 (see FIG. 1). , A second exhaust gas inlet 36B for introducing exhaust gas that rotationally drives the high-pressure turbine 61 (see FIG. 1) and a second exhaust gas outlet port that exhausts exhaust gas for rotationally driving the low-pressure turbine 41 (see FIG. 1) 37B is provided. In other words, the exhaust manifold 30 includes the first exhaust gas inlet 31B for introducing the high temperature exhaust gas discharged from the engine 10 and the second exhaust gas inlet 36B for introducing the exhaust gas whose temperature is lowered by the high pressure supercharger 60. A total of two types of exhaust gas inlets are provided. Further, the exhaust manifold 30 includes a first exhaust gas outlet 33B for discharging the high temperature exhaust gas discharged from the engine 10 and a second exhaust gas outlet 37B for discharging the exhaust gas whose temperature is lowered by the low pressure supercharger 40. Two types of exhaust outlets are provided.

The bypass passage portion 38 extends obliquely upward from the exhaust collecting portion 32 toward the low-pressure stage turbine housing 34 in the opposite direction to the low-pressure stage exhaust introduction passage portion 36. That is, when the exhaust manifold 30 is viewed laterally from the cylinder arrangement direction of the engine 10 (longitudinal direction of the exhaust collecting portion 32 ), the exhaust outlet passage portion 33 extending laterally from the exhaust collecting portion 32 and diagonally above the fixed flange portion 39. The low-pressure stage exhaust introduction passage 36 and the bypass passage 38 extending obliquely upward from the exhaust collecting portion 32 form a substantially triangular exhaust passage structure with the low-pressure turbine housing 34 as an apex. As a result, the exhaust collecting portion 32 and the low-pressure turbine housing 34 can be connected by the relatively short bypass passage portion 38, and the exhaust manifold 30 as a whole can be made compact.

The bypass passage portion 38 is provided with a bypass valve 90 (see FIG. 1) capable of opening and closing the flow passage of the bypass passage portion 38. In the present embodiment, the actuator 91 that operates the bypass valve 90 is provided immediately above the exhaust gas collecting portion 32 on the cylinder head CH side of the low pressure stage turbine housing 34. That is, by accommodating the actuator 91 on the cylinder head CH side of the low-pressure turbine housing 34, it is possible to effectively prevent interference with peripheral components in the engine room.

According to the exhaust manifold 30 of the present embodiment described in detail above, the low pressure stage turbine housing 34 is provided above the exhaust derivation passage portion 33 extending laterally from the exhaust collecting portion 32, and the outlet end of the exhaust derivation passage portion 33 is provided. The low pressure stage exhaust gas introduction passage portion 36 extends obliquely upward from the fixed flange portion 39 toward the low pressure stage turbine housing 34, and the bypass passage portion 38 extends obliquely upward from the exhaust gas collecting portion 32 toward the low pressure stage turbine housing 34. As a result, the

respective passage portions

33, 36, 38 form an exhaust passage structure having a substantially triangular shape.

As a result, the distance between the high-pressure turbine housing 70 and the low-pressure turbine housing 34 attached to the fixed flange portion 39 is relatively short, and the exhaust collecting portion 32 and the low-pressure turbine housing 34 are relatively short bypass passage portions 38. The exhaust system structure including the exhaust manifold 30 and the high pressure turbine housing 70 can be made compact. In addition, the compactness can be effectively prevented from interfering with the peripheral parts in the engine room, and the mountability can be surely improved.

Further, by providing the bypass passage portion 38 closer to the exhaust collecting portion 32 side than the fixed flange portion 39, the actuator 91 that operates the bypass valve 90 can be housed closer to the cylinder head CH than the low pressure turbine housing 34. Therefore, it is possible to effectively prevent the actuator 91 from interfering with the peripheral parts in the engine room.

Further, since the low pressure stage turbine housing 34 is formed integrally with the exhaust manifold 30, it is possible to omit the step of assembling the low pressure stage turbine housing 34 during assembly, and it is possible to reliably improve the assemblability.

Further, when the exhaust manifold 30 is assembled to the cylinder head CH, the work can be performed in a state where the high-pressure stage turbine housing 70 is not attached to the fixed flange portion 39, so a bolting tool or the like can be easily inserted up to the fixed flange portion 31A. Therefore, the workability of assembling can be surely improved.

[Exhaust system structure]
FIG. 3 is a schematic side view of a state in which the high-pressure turbine housing 70 is attached to the fixed flange portion 39 of the exhaust manifold 30, as viewed from the longitudinal direction of the exhaust collecting portion 32.

As shown in FIG. 3, the high-pressure stage turbine housing 70 includes a high-pressure stage flange portion 77 integrally provided at the inlet end of the high-pressure stage exhaust introduction passage portion 72 and the outlet end of the high-pressure stage exhaust discharge passage portion 73. .. The high-pressure stage turbine housing 70 is attached by fixing the high-pressure stage flange portion 77 to the fixed flange portion 39 of the exhaust manifold 30, preferably by interposing a gasket (not shown) between them and fastening them with bolts and nuts. ..

In the present embodiment, the fixed flange portion 39 is provided so that its flange surface 39A is inclined obliquely downward, and the high pressure step flange portion 77 is inclined so that its flange surface 77A is obliquely upward. Are provided. That is, the joint surface M of each of the

flange portions

39 and 77 is configured to be inclined at a predetermined angle with respect to the vertical direction.

The high-pressure stage exhaust introduction passage portion 72 extends laterally from the high-pressure stage flange portion 77 so as to extend substantially on the same straight line as the exhaust discharge passage portion 33. That is, the acute angle θ formed by the flow path axis X1 of the exhaust gas outlet passage portion 33 and the joint surface M of the

flange portions

39, 77, the flow path axis X2 of the high pressure stage exhaust gas introduction passage portion 72, and the flanges. An acute angle θ formed by the joint surfaces M of the

portions

39 and 77 is substantially equal to each other. In this way, by exhausting the exhaust derivation passage portion 33 and the high-pressure stage exhaust introduction passage portion 72 in a lateral direction on substantially the same straight line, the exhaust gas flowing through the exhaust derivation passage portion 33 is discharged into the high-pressure stage exhaust introduction passage portion 72. Is smoothly taken in, and the pressure loss of exhaust gas can be effectively suppressed.

The high-pressure stage exhaust derivation passage portion 73 extends obliquely upward from the substantially central portion of the high-pressure stage turbine housing 70 toward the high-pressure stage flange portion 77 so as to extend substantially on the same straight line as the low-pressure stage exhaust introduction passage portion 36. ing. That is, the flow path axis X3 of the high-pressure stage exhaust introduction passage portion 73 and the flow path axis X4 of the low-pressure stage exhaust introduction passage portion 36 are configured to be substantially orthogonal to the joint surface M of the

flange portions

39 and 77. There is. In this way, the high-pressure stage exhaust derivation passage portion 73 and the low-pressure stage exhaust introduction passage portion 36 are obliquely extended on substantially the same straight line, so that the high-pressure stage exhaust scroll passage 71 flows into the high-pressure stage exhaust derivation passage portion 73. The exhaust gas is smoothly taken into the low pressure stage exhaust gas introduction passage portion 36, and the pressure loss of the exhaust gas can be effectively suppressed.

When the high-pressure stage turbine housing 70 configured as described above is attached to the exhaust manifold 30, the high-pressure stage turbine housing 70 is in a substantially lateral direction on the side opposite to the engine 10 with respect to the exhaust gas collecting portion 32, and in the low-pressure stage. It is arranged obliquely below the turbine housing 34. That is, when viewed in the longitudinal direction of the exhaust gas collecting portion 32, the exhaust gas collecting portion 32, the high-pressure turbine housing 70, and the low-pressure turbine housing 34 are arranged in a substantially triangular shape with the low-pressure turbine housing 34 as an apex. Has been done.

As a result, compared to a structure in which the high-pressure turbine housing 70 and the low-pressure turbine housing 34 are arranged vertically in the vertical direction, the vertical arrangement height of each of the

housings

70, 34 can be effectively suppressed, and the exhaust gas The entire system structure can be made compact. Further, by suppressing the height of the entire exhaust system structure in the vertical direction, it is possible to effectively prevent interference with peripheral parts arranged above or below the

housings

70 and 34 in the engine room, The mountability can be surely improved.

Further, by making the joint surfaces M of the

flange portions

39, 77 oblique, the joint surfaces M are oriented in the vertical direction, in other words, as compared with the structure in which the

housings

70, 34 are arranged side by side, the high pressure stage. The lateral projection of the turbine housing 70 is effectively suppressed. As a result, it is possible to effectively prevent interference with peripheral components arranged laterally with respect to the high-pressure turbine housing 70 in the engine room, and also in this respect, it is possible to reliably improve the mountability. You can

[Other]
It should be noted that the present disclosure is not limited to the above-described embodiments, and may be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above-described embodiment, the low-pressure stage turbine housing 34 has been described as being arranged obliquely above the high-pressure stage turbine housing 70 and the exhaust gas collection unit 32. Alternatively, it may be arranged diagonally downward. In this case, the fixed flange portion 39 may be provided so as to be inclined obliquely upward.

Further, the low pressure turbine housing 34 has been described as being formed integrally with the exhaust manifold 30, but these may be configured separately.

Further, the exhaust system device attached to the fixed flange portion 39 of the exhaust manifold 30 is not limited to the high pressure supercharger 60, and may be another exhaust system device such as an exhaust purification device, an exhaust brake device, an exhaust gas recirculation device, or the like. May be.

This application is based on the Japanese patent application (Japanese Patent Application 2019-028388) filed on February 20, 2019, the content of which is incorporated herein by reference.

The exhaust manifold of the present disclosure is useful in that the exhaust system structure can be made compact.

10 Engine CH Cylinder Head 13 Exhaust Port 30 Exhaust Manifold 31 Exhaust Introduction Passage (First Passage)
31B 1st exhaust inlet (1st inlet)
32 Exhaust gas collection section (first passage section)
33 Exhaust gas discharge passage portion (first passage portion)
33B First exhaust outlet (first outlet)
34 low-pressure stage turbine housing 35 low-pressure stage exhaust scroll passage (second passage portion)
36 Low Pressure Stage Exhaust Introduction Passage (Second Passage)
36B Second exhaust gas inlet (second inlet)
37 Low-pressure stage exhaust derivation passage portion (second passage portion)
37B Second exhaust outlet (second outlet)
38 Bypass passage 39 Fixed flange (flange)
40 Low Pressure Supercharger 41 Low Pressure Turbine 42 Low Pressure Compressor 45 Low Pressure Compressor Housing 47 Low Pressure Intake Scroll Passage 48 Low Pressure Intake Passage 49 Low Pressure Discharge Passage 60 High Pressure Supercharger (Other Exhaust Systems)
61 high pressure turbine 62 high pressure compressor 70 high pressure turbine housing 71 high pressure exhaust scroll passage 72 high pressure exhaust introduction passage 73 high pressure exhaust discharge passage 80 high pressure compressor housing 81 high pressure intake scroll passage 82 high pressure intake passage 83 High pressure stage discharge passage 90 Bypass valve
91 Actuator

Claims

A first inlet for introducing exhaust gas discharged from the engine;
A first passage portion that extends from the first introduction port and allows circulation of the exhaust gas taken in from the first introduction port;
A first outlet that is provided at the outlet of the first passage and that guides the exhaust gas that has flowed through the first passage to another exhaust system device;
A second inlet for introducing the exhaust gas flowing through the other exhaust system device;
A second passage portion that extends from the second introduction port and allows the exhaust gas taken in from the second introduction port to flow;
A second outlet provided at an outlet of the second passage for leading out exhaust gas flowing through the second passage;
An exhaust manifold, comprising: a bypass passage portion connecting the first passage portion and the second passage portion so that the exhaust gas flowing through the first passage portion bypasses the other exhaust system device.
The first outlet and the second inlet are provided in a flange portion to which the other exhaust system device is attached,
The first passage portion extends laterally from the first inlet to the first outlet on the side opposite to the engine,
At least a part of the second passage portion is obliquely extended from the second introduction port to the engine side,
The exhaust manifold according to claim 1, wherein the bypass passage portion extends obliquely from the first passage portion toward the second passage portion.
The valve which can open and close the flow passage of the bypass passage portion is provided in the bypass passage portion, and an actuator for operating the valve is arranged closer to the engine than the bypass passage portion. Exhaust manifold.
The exhaust manifold according to any one of claims 1 to 3, wherein a turbine of the supercharger is arranged in the second passage portion, and a turbine housing that houses the turbine is integrally provided.
The other exhaust system device is a high-pressure stage supercharger having a high-pressure stage turbine that is rotationally driven by the exhaust gas taken in from the first outlet, and the turbine provided in the second passage portion is a low-pressure stage supercharger. The exhaust manifold according to claim 4, which is a low-pressure turbine of a machine.