阅读说明：本技术 排气歧管 (Exhaust manifold ) 是由 澁谷大智 于 2020-02-14 设计创作，主要内容包括：包括：第1导入口(31B),其导入从引擎(10)排出的排气；第1通路部(31)、(32)、(33),其从第1导入口(31B)延伸,并且使从第1导入口(31B)取入的排气流通；第1导出口(33B),其被设置于第1通路部(31)、(32)、(33)的出口部,将在第1通路部(31)、(32)、(33)中流动后的排气导入到其他排气系统装置(60)；第2导入口(36B),其导入在其他排气系统装置(60)中流动后的排气；第2通路部(35)、(36)、(37),其从第2导入口(36B)延伸,并且使从第2导入口(36B)取入的排气流通；第2导出口(37B),其被设置于第2通路部(35)、(36)、(37)的出口部,并导出在第2通路部(35)、(36)、(37)中流动后的排气；以及旁通通路部(38),其连接第1通路部(32)与第2通路部(36),使得在第1通路部(31)、(32)、(33)中流动的排气绕过其他排气系统装置(60)。(The method comprises the following steps: a 1 st inlet (31B) for introducing exhaust gas discharged from the engine (10); a 1 st passage section (31), (32), (33) which extends from the 1 st inlet (31B) and through which the exhaust gas taken in from the 1 st inlet (31B) flows; a 1 st outlet port (33B) that is provided at an outlet portion of the 1 st passage portion (31), (32), or (33) and that introduces the exhaust gas that has flowed through the 1 st passage portion (31), (32), or (33) into another exhaust system device (60); a 2 nd inlet (36B) for introducing the exhaust gas that has flowed through another exhaust system device (60); a 2 nd passage part (35), (36), (37) which extends from the 2 nd inlet (36B) and which circulates the exhaust gas taken in from the 2 nd inlet (36B); a 2 nd outlet port (37B) that is provided at an outlet portion of the 2 nd passage portion (35), (36), or (37) and that discharges the exhaust gas that has flowed through the 2 nd passage portion (35), (36), or (37); and a bypass passage portion (38) that connects the 1 st passage portion (32) and the 2 nd passage portion (36) so that the exhaust gas flowing through the 1 st passage portions (31), (32), and (33) bypasses the other exhaust system devices (60).)

1. An exhaust manifold, comprising:

a 1 st inlet port for introducing exhaust gas discharged from the engine,

a 1 st passage portion extending from the 1 st introduction port and allowing the exhaust gas introduced from the 1 st introduction port to flow therethrough,

a 1 st lead-out port provided at an outlet portion of the 1 st passage portion and leading out the exhaust gas flowing through the 1 st passage portion to another exhaust system device,

a 2 nd inlet port for introducing the exhaust gas flowing through the other exhaust system device,

a 2 nd passage portion extending from the 2 nd inlet port and allowing the exhaust gas introduced from the 2 nd inlet port to flow therethrough,

a 2 nd lead-out port that is provided at the outlet portion of the 2 nd passage portion and leads out the exhaust gas that has flowed through the 2 nd passage portion, an

And a bypass passage portion that connects the 1 st passage portion and the 2 nd passage portion so that the exhaust gas flowing through the 1 st passage portion bypasses the other exhaust system devices.

2. The exhaust manifold according to claim 1,

the 1 st outlet port and the 2 nd inlet port are provided in a flange portion to which the other exhaust system device is attached;

the 1 st passage section extends in the lateral direction from the 1 st introduction port toward the 1 st discharge port on the opposite side of the engine;

at least a part of the 2 nd passage portion extends obliquely from the 2 nd introduction port toward the engine side;

the bypass passage portion extends obliquely from the 1 st passage portion to the 2 nd passage portion.

3. The exhaust manifold according to claim 2,

the bypass passage portion is provided with a valve capable of opening and closing a flow passage of the bypass passage portion, and an actuator for actuating the valve is disposed on the engine side of the bypass passage portion.

4. An exhaust manifold according to any of claims 1 to 3,

a turbine of the supercharger is disposed in the 2 nd passage portion, and a turbine housing accommodating the turbine is integrally provided.

5. The exhaust manifold according to claim 4,

the other exhaust system device is a high-pressure-stage supercharger having a high-pressure-stage turbine rotationally driven by the exhaust gas taken in from the 1 st exhaust port, and the turbine provided in the 2 nd passage portion is a low-pressure-stage turbine of a low-pressure-stage supercharger.

Technical Field

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

Background

As a technique for increasing the output of an engine, a supercharger is widely used which includes a turbine driven by exhaust gas and a compressor provided coaxially with the turbine and pressure-feeding intake air. For example, patent document 1 discloses a two-stage supercharging system in which a high-pressure-stage supercharger and a low-pressure-stage supercharger are mounted on a side portion of an exhaust manifold in an up-down vertical arrangement.

Prior art documents

Patent document

Patent document 1: japanese unexamined patent publication No. 2012-12988

Disclosure of Invention

Technical problem to be solved by the invention

In general, in an exhaust system device such as an exhaust manifold or a supercharger mounted on an engine, there is a demand for making the device compact in terms of space restriction in an engine compartment and improvement in mountability.

In the structure described in patent document 1, the housings of the exhaust manifold, the high-pressure-stage supercharger, and the low-pressure-stage supercharger are individually configured. Therefore, the overall exhaust system structure including these high-pressure-stage supercharger and low-pressure-stage supercharger becomes large, and there is a possibility that the interference with peripheral components and the mounting performance are deteriorated.

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

Means for solving the problems

The disclosed exhaust manifold includes: a 1 st inlet port for introducing exhaust gas discharged from the engine; a 1 st passage portion extending from the 1 st inlet port and allowing the exhaust gas introduced from the 1 st inlet port to flow therethrough; a 1 st outlet port provided at an outlet portion of the 1 st passage unit, the 1 st outlet port configured to lead the exhaust gas flowing through the 1 st passage unit to another exhaust system device; a 2 nd inlet port for introducing the exhaust gas flowing through the other exhaust system device; a 2 nd passage portion extending from the 2 nd inlet port and allowing the exhaust gas taken in from the 2 nd inlet port to flow therethrough; a 2 nd outlet port that is provided at an outlet portion of the 2 nd passage portion and that discharges the exhaust gas that has flowed through the 2 nd passage portion; and a bypass passage portion that connects the 1 st passage portion and the 2 nd passage portion so that the exhaust gas flowing through the 1 st passage portion bypasses the other exhaust system devices.

Further, it is preferable that the 1 st outlet port and the 2 nd inlet port are provided in a flange portion to which the other exhaust system device is attached, the 1 st passage portion extends in a lateral direction from the 1 st inlet port toward the 1 st outlet port on an opposite side of the engine, at least a part of the 2 nd passage portion extends obliquely from the 2 nd inlet port toward the engine, and the bypass passage portion extends obliquely from the 1 st passage portion toward the 2 nd passage portion.

Preferably, the bypass passage portion is provided with a valve capable of opening and closing a flow passage of the bypass passage portion, and an actuator for actuating the valve is disposed on the engine side of the bypass passage portion.

Preferably, a turbine of the supercharger is disposed in the 2 nd passage portion, and a turbine housing accommodating the turbine is integrally provided.

Preferably, the other exhaust system device is a high-pressure-stage supercharger having a high-pressure-stage turbine rotationally driven by the exhaust gas taken in from the 1 st exhaust port, and the turbine provided in the 2 nd passage portion is a low-pressure-stage turbine of a low-pressure-stage supercharger.

Effects of the invention

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

Drawings

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 an exhaust manifold according to an embodiment.

Fig. 3 is a schematic side view of a state in which a high-pressure stage turbine casing is attached to a fixed flange portion of an exhaust manifold according to an embodiment, as viewed from a longitudinal direction of an exhaust collecting portion.

Detailed Description

Hereinafter, an exhaust manifold according to an embodiment will be described with reference to the drawings. The same components are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[ integral constitution ]

Fig. 1 is a schematic overall configuration diagram showing an intake system and an exhaust system of an engine 10 according to the present embodiment.

The engine 10 includes an engine main body 11, and the engine main body 11 mainly includes a cylinder block, a cylinder head CH provided at an upper portion of the cylinder block, and the like. In the cylinder block, a plurality of cylinders C defining combustion chambers are arranged 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 discharging exhaust gas from the cylinder C. The engine 10 is not limited to the in-line multi-cylinder engine shown in the drawing, and may be a single-cylinder engine. The engine 10 may be a V-type engine or a horizontally opposed engine.

An intake manifold 20 that distributes intake air to the intake ports 12 is provided on an intake-side portion of the cylinder head CH. An air cleaner 21, a 1 st intake pipe 22, a low-pressure stage compressor housing 45 of a low-pressure stage supercharger 40, a 2 nd intake pipe 23, a high-pressure stage compressor housing 80 of a high-pressure stage supercharger 60, and a 3 rd intake pipe 24 are connected to the intake manifold 20 in this order from the intake upstream side. An intercooler 25 for cooling intake air is provided in the 3 rd intake pipe 24.

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 1 st passage portion) connected to the outlet portions of the exhaust ports 13, an exhaust collecting portion 32 (a part of the 1 st passage portion) where the exhaust introduction passage portions 31 respectively join, and an exhaust discharge passage portion 33 (a part of the 1 st passage portion) where exhaust is discharged from the exhaust collecting portion 32. Further, a low-pressure stage turbine housing 34 of a low-pressure stage supercharger 40 is integrally provided on the exhaust manifold 30.

The low-pressure stage supercharger 40 includes: a low-pressure stage turbine 41, a low-pressure stage compressor 42, a rotating shaft 43 connecting the low-pressure stage turbine 41 and the low-pressure stage compressor 42, and a bearing, not shown, for shaft-supporting the rotating shaft 43. The low-pressure stage turbine 41 is housed within a low-pressure stage turbine housing 34, the low-pressure stage turbine housing 34 being integrally formed with the exhaust manifold 30. The low pressure stage compressor 42 is housed within a low pressure stage compressor housing 45. Between these low-pressure stage turbine housing 34 and low-pressure stage compressor housing 45, a bearing housing 46 that houses a bearing is provided. The low-pressure-stage supercharger 40 is not limited to the conventional type illustrated in the drawings, and may be a variable capacity type including variable vanes.

A low-pressure stage gas scroll passage 47 extending circumferentially around the low-pressure stage compressor 42 is provided in the low-pressure stage compressor housing 45. Further, the low-pressure stage compressor housing 45 is provided with a low-pressure stage suction passage portion 48 that sucks intake air into the low-pressure stage intake scroll passage 47. Further, the low-pressure stage compressor casing 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 1 st intake pipe 22 is connected to the low-pressure stage intake passage portion 48, and the 2 nd intake pipe 23 is connected to the low-pressure stage discharge passage portion 49.

A low-pressure stage exhaust scroll passage 35 (a part of the 2 nd passage portion) extending in the circumferential direction around the low-pressure stage turbine 41 is provided in a low-pressure stage turbine housing 34 formed integrally with the exhaust manifold 30. Further, the exhaust manifold 30 is provided with a low-pressure stage exhaust gas introduction passage portion 36 (a part of the 2 nd 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 gas discharge passage portion 37 (a part of the 2 nd passage portion) for discharging exhaust gas from the low-pressure stage exhaust scroll passage 35. The exhaust pipe 27 is connected to the low-pressure stage exhaust gas discharge passage portion 37, and the casing 29 of the exhaust gas 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, an NOx catalyst, and the like are accommodated.

Further, the exhaust manifold 30 is provided with a bypass passage portion 38 connecting the exhaust gas collecting portion 32 and the low-pressure stage exhaust scroll passage 35 so that the exhaust gas discharged from the exhaust gas collecting portion 32 bypasses the high-pressure stage supercharger 60. The bypass passage portion 38 is provided with a bypass valve 90 that can open and close the flow passage of the bypass passage portion 38. The bypass valve 90 is operated by an actuator 91 (e.g., a diaphragm or electromagnetic actuator). The bypass valve 90 may be any valve capable of linearly adjusting the opening degree or an ON/OFF valve.

When exhaust gas is introduced into the low-pressure stage exhaust scroll passage 35 from at least one of the low-pressure stage exhaust gas introduction passage portion 36 and the bypass passage portion 38, the low-pressure stage supercharger 40 configured as described above rotates the low-pressure stage compressor 42 by rotating the low-pressure stage turbine 41. When the low-pressure stage compressor 42 is rotationally driven, the intake air is taken into the low-pressure stage intake scroll passage 47 from the 1 st intake pipe 22 via the low-pressure stage intake passage portion 48, and the intake air pressurized by the low-pressure stage compressor 42 is pressure-fed from the low-pressure stage discharge passage portion 49 to the 2 nd intake pipe 23.

The high-pressure stage supercharger 60 (one example of another exhaust system device) includes: a high-pressure stage turbine 61, a high-pressure stage compressor 62, a rotating shaft 63 connecting the high-pressure stage turbine 61 and the high-pressure stage compressor 62, and a bearing, not shown, for rotatably supporting the rotating shaft 63. The high-pressure stage turbine 61 is housed within a high-pressure stage turbine housing 70. The high pressure stage compressor 62 is housed within a high pressure stage compressor housing 80. Between these high-pressure stage turbine housings 70 and the high-pressure stage compressor housing 80, there is provided a bearing housing 88 that houses bearings. The high-pressure stage supercharger 60 is not limited to the conventional type illustrated in the drawing, and may be a variable capacity type including variable vanes.

A high-pressure stage compressor casing 80 is provided with a high-pressure stage gas scroll passage 81 extending circumferentially around the high-pressure stage 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 casing 80 is provided with a high-pressure stage discharge passage portion 83 that discharges intake air from the high-pressure stage air swirl passage 81. The 2 nd intake pipe 23 is connected to the high-pressure stage intake passage portion 82, and the 3 rd intake pipe 24 is connected to the high-pressure stage discharge passage portion 83.

A high-pressure stage exhaust scroll passage 71 extending circumferentially around the high-pressure stage turbine 61 is provided in the high-pressure stage turbine housing 70. Further, the high-pressure stage turbine housing 70 is provided with a high-pressure stage exhaust gas introduction passage portion 72 that introduces 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 gas discharge passage portion 73 that discharges exhaust gas from the high-pressure stage exhaust scroll passage 71. The exhaust gas outlet passage portion 33 of the exhaust manifold 30 is connected to the high-pressure stage exhaust gas inlet passage portion 72. The low-pressure stage exhaust introduction passage portion 36 of the exhaust manifold 30 is connected to the high-pressure stage exhaust discharge passage portion 73.

When the high-pressure-stage supercharger 60 configured as described above introduces exhaust gas from the exhaust gas discharge passage portion 33 into the high-pressure-stage exhaust scroll passage 71 through the high-pressure-stage exhaust gas introduction passage portion 72, the high-pressure-stage turbine 71 rotates, and the high-pressure-stage compressor 72 rotates. When the high-pressure stage compressor 72 is rotationally driven, the intake air is taken into the high-pressure stage intake scroll passage 81 from the 2 nd intake pipe 23 via the high-pressure stage intake passage portion 82, and the intake air pressurized by the high-pressure stage compressor 62 is pressure-fed from the high-pressure stage discharge passage portion 83 to the 3 rd intake pipe 24.

[ exhaust manifold ]

Fig. 2 is a schematic perspective view showing an exhaust manifold 30 according to the present embodiment.

As shown in fig. 2, the exhaust manifold 30 integrally includes: the exhaust gas guide passage portion 31, the exhaust gas collecting portion 32, the exhaust gas discharge passage portion 33, the low-pressure stage turbine housing 34 in which the low-pressure stage exhaust scroll passage 35 (see fig. 1) is formed, the low-pressure stage exhaust gas guide passage portion 36, the low-pressure stage exhaust gas discharge passage portion 37, and the bypass passage portion 38.

The exhaust introduction passage portions 31 are provided in the number corresponding to the number of cylinders of the engine 10, and extend in a direction (lateral direction) orthogonal to the direction in which the cylinders of the engine 10 are arranged. A fixed flange portion 31A 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, a flange surface of the fixed flange portion 31A is provided with a 1 st exhaust inlet port 31B (1 st inlet port) that opens to face the exhaust port 13 (see fig. 1) of the cylinder head CH.

The exhaust gas collecting portion 32 extends parallel to the direction in which the cylinders of the engine 10 are arranged, and merges the outlet ends of the exhaust gas introduction passage portions 31. Namely, the structure is as follows: the exhaust gases introduced into the exhaust introduction passage portion 31 from the exhaust ports 13 (see fig. 1) of the engine 10 flow in the longitudinal direction in the exhaust collecting portion 32 and join together.

The exhaust gas discharge passage portion 33 branches from the exhaust gas collecting portion 32 and extends in the lateral direction on the opposite side to the exhaust gas introduction passage portion 31. A low-pressure stage turbine casing 34 is provided directly above the exhaust gas discharge passage portion 33. Further, a fixed flange portion 39 for attaching a high-pressure stage turbine housing 70 (see fig. 1) is provided at the outlet end of the exhaust gas discharge passage portion 33. A flange surface 39A of the fixed flange portion 39 is provided with a 1 st exhaust gas outlet 33B (1 st outlet) that opens to face a high-pressure stage exhaust gas introduction passage portion 72 (see fig. 1) of the high-pressure stage turbine housing 70. Namely, the structure is as follows: the exhaust gas flowing from the exhaust gas collecting portion 32 into the exhaust gas discharge passage portion 33 is introduced into the high-pressure-stage exhaust gas introduction passage portion 72 through the 1 st exhaust gas discharge port 33B (see fig. 1).

In the present embodiment, the fixed flange portion 39 is provided so that the flange surface 39A thereof is inclined obliquely downward at a predetermined angle with respect to the axial center of the exhaust gas discharge passage portion 33. That is, the high-pressure stage turbine casing 70 (see fig. 1) is arranged obliquely downward with respect to the low-pressure stage turbine casing 34 above the exhaust gas discharge passage portion 33. In the flange surface 39A of the fixed flange 39, a 2 nd exhaust introduction port 36B (2 nd introduction port) opening through which exhaust gas is introduced from the high-pressure stage exhaust gas discharge passage portion 73 (see fig. 1) is formed above the 1 st exhaust introduction port 33B.

The low-pressure stage exhaust gas introduction passage portion 36 extends obliquely upward from the 2 nd exhaust gas introduction port 36B of the fixed flange portion 39 toward the low-pressure stage turbine casing 34. The outlet end of the low-pressure stage turbine housing 34 merges with a low-pressure stage exhaust scroll passage 35 (see fig. 1) in the low-pressure stage turbine housing 34. Further, the low-pressure stage turbine housing 34 is provided with a low-pressure stage exhaust gas discharge passage portion 37 that discharges exhaust gas from the low-pressure stage exhaust scroll passage 35. A low-pressure stage flange 37A to which an exhaust pipe (not shown) is fixed is provided at an outlet end of the low-pressure stage exhaust gas discharge passage 37, and a 2 nd exhaust gas discharge port 37B (2 nd discharge port) is formed to open in a flange surface of the low-pressure stage flange 37A.

That is, the exhaust manifold 30 is provided with: the exhaust gas recirculation system includes a plurality of 1 st exhaust gas introduction ports 31B for directly introducing exhaust gas from the engine 10, a 1 st exhaust gas discharge port 33B for discharging exhaust gas to the high-pressure stage turbine casing 70 (see fig. 1), a 2 nd exhaust gas introduction port 36B for introducing exhaust gas for rotationally driving the high-pressure stage turbine 61 (see fig. 1), and a 2 nd exhaust gas discharge port 37B for discharging exhaust gas for rotationally driving the low-pressure stage turbine 41 (see fig. 1). In other words, the exhaust manifold 30 is provided with 2 types of exhaust gas introduction ports in total, that is, the 1 st exhaust gas introduction port 31B for introducing the high-temperature exhaust gas discharged from the engine 10 and the 2 nd exhaust gas introduction port 36B for introducing the exhaust gas whose temperature has been reduced by the high-pressure stage supercharger 60. The exhaust manifold 30 is provided with 2 kinds of exhaust gas outlet ports in total, i.e., a 1 st exhaust gas outlet port 33B for discharging high-temperature exhaust gas discharged from the engine 10 and a 2 nd exhaust gas outlet port 37B for discharging exhaust gas whose temperature has been reduced by the low-pressure stage supercharger 40.

The bypass passage portion 38 extends obliquely upward from the exhaust gas collecting portion 32 toward the low-pressure stage turbine casing 34 in a direction opposite to the low-pressure stage exhaust gas introduction passage portion 36. That is, when the exhaust manifold 30 is viewed in side view from the cylinder arrangement direction (the longitudinal direction of the exhaust collecting portion 32) of the engine 10, the exhaust gas outlet passage portion 33 extending laterally from the exhaust collecting portion 32, the low-pressure stage exhaust gas inlet passage portion 36 extending obliquely upward from the fixed flange portion 39, and the bypass passage portion 38 extending obliquely upward from the exhaust collecting portion 32 form an exhaust passage structure having a substantially triangular shape with the low-pressure stage turbine housing 34 as a vertex. Thus, the exhaust gas collecting portion 32 and the low-pressure stage turbine casing 34 can be connected by the short bypass passage portion 38, and the entire exhaust manifold 30 can be made compact.

The bypass passage portion 38 is provided with a bypass valve 90 (see fig. 1) that can open and close the flow passage of the bypass passage portion 38. In the present embodiment, the actuator 91 that operates the bypass valve 90 is provided directly above the exhaust collecting portion 32 on the cylinder head CH side of the low-pressure stage turbine housing 34. That is, by accommodating the actuator 91 closer to the cylinder head CH than the low-pressure stage turbine housing 34, interference with peripheral components in the engine compartment can be effectively prevented.

According to the exhaust manifold 30 of the present embodiment described in detail above, the low-pressure stage turbine casing 34 is provided above the exhaust gas discharge passage 33 extending in the lateral direction from the exhaust gas collecting portion 32, the low-pressure stage exhaust gas introduction passage 36 is provided extending obliquely upward from the fixed flange portion 39 at the outlet end of the exhaust gas discharge passage 33 toward the low-pressure stage turbine casing 34, and the bypass passage 38 is provided extending obliquely upward from the exhaust gas collecting portion 32 toward the low-pressure stage turbine casing 34, whereby the exhaust gas passage structure having a substantially triangular shape is formed by these passage portions 33, 36, 38.

Accordingly, the distance between the high-pressure stage turbine casing 70 attached to the fixed flange portion 39 and the low-pressure stage turbine casing 34 can be made short, and the exhaust gas collecting portion 32 and the low-pressure stage turbine casing 34 can be connected by the short bypass passage portion 38, so that the entire exhaust system structure including the exhaust manifold 30 and the high-pressure stage turbine casing 70 can be made compact. Further, by making the engine compact, interference with peripheral components in the engine room can be effectively prevented, and mountability can be reliably improved.

Further, by providing the bypass passage portion 38 on the exhaust collecting portion 32 side of the fixed flange portion 39, the actuator 91 that operates the bypass valve 90 can be accommodated on the cylinder head CH side of the low-pressure stage turbine housing 34, and interference between the actuator 91 and peripheral components in the engine room can be effectively prevented.

Further, by integrally forming the low-pressure stage turbine casing 34 on the exhaust manifold 30, the step of assembling the low-pressure stage turbine casing 34 can be omitted at the time of assembly, and the assemblability can be reliably improved.

Further, when the exhaust manifold 30 is assembled to the cylinder head CH, since 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, a bolt fastening tool or the like can be easily inserted into the fixed flange portion 31A, and the assembling workability can be reliably improved.

[ exhaust system Structure ]

Fig. 3 is a schematic side view of the exhaust collecting portion 32 viewed in the longitudinal direction, in a state where the high-pressure stage turbine casing 70 is attached to the fixed flange portion 39 of the exhaust manifold 30.

As shown in fig. 3, the high-pressure stage turbine housing 70 includes a high-pressure stage flange portion 77 integrally provided at an inlet end of the high-pressure stage exhaust introduction passage portion 72 and an outlet end of the high-pressure stage exhaust discharge passage portion 73. The high-pressure stage flange portion 77 is attached to the fixed flange portion 39 of the exhaust manifold 30, and preferably, a gasket, not shown, is interposed therebetween and fastened with a bolt, thereby attaching the high-pressure stage turbine casing 70.

In the present embodiment, the fixed flange portion 39 is provided so that the flange surface 39A thereof is inclined obliquely downward, and the high-pressure-stage flange portion 77 is provided so that the flange surface 77A thereof is inclined obliquely upward. That is, the joint surface M of each of the flange portions 39 and 77 is inclined at a predetermined angle with respect to the vertical direction.

The high-pressure stage exhaust introduction passage portion 72 extends in the lateral direction 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. Namely, the structure is as follows: the acute angle θ formed by the flow path axis X1 of the exhaust gas discharge passage portion 33 and the joint surface M of each flange portion 39, 77 and the acute angle θ formed by the flow path axis X2 of the high-pressure stage exhaust gas introduction passage portion 72 and the joint surface M of each flange portion 39, 77 are substantially equal to each other. As described above, by providing the exhaust gas discharge passage portion 33 and the high-pressure stage exhaust gas introduction passage portion 72 to extend in the lateral direction on substantially the same straight line, the exhaust gas flowing in the exhaust gas discharge passage portion 33 is smoothly taken into the high-pressure stage exhaust gas introduction passage portion 72, and the pressure loss of the exhaust gas can be effectively suppressed.

The high-pressure stage exhaust gas discharge passage portion 73 extends obliquely upward from a 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 gas introduction passage portion 36. Namely, the structure is as follows: the flow path axis X3 of the high-pressure stage exhaust gas discharge passage portion 73 and the flow path axis X4 of the low-pressure stage exhaust gas introduction passage portion 36 are substantially perpendicular to the joint surface M of the flange portions 39, 77. As described above, by providing the high-pressure stage exhaust gas discharge passage portion 73 and the low-pressure stage exhaust gas introduction passage portion 36 to extend obliquely substantially on the same straight line, the exhaust gas flowing out of the high-pressure stage exhaust scroll passage 71 into the high-pressure stage exhaust gas discharge passage portion 73 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.

If the high-pressure stage turbine casing 70 configured as described above is attached to the exhaust manifold 30, the high-pressure stage turbine casing 70 is arranged substantially in the lateral direction on the opposite side of the exhaust collecting portion 32 from the engine 10 and obliquely below the low-pressure stage turbine casing 34. That is, the exhaust collecting portion 32, the high-pressure stage turbine casing 70, and the low-pressure stage turbine casing 34 are configured to be arranged in a substantially triangular shape with the low-pressure stage turbine casing 34 as a vertex when viewed from the longitudinal direction of the exhaust collecting portion 32.

As a result, compared to a configuration in which the high-pressure turbine casing 70 and the low-pressure turbine casing 34 are disposed vertically above each other, the vertical disposition height of the casings 70 and 34 can be effectively reduced, and the overall exhaust system configuration can be made compact. Further, by suppressing the height in the vertical direction of the entire exhaust system structure, interference with peripheral components disposed above or below the housings 70 and 34 in the engine compartment is effectively prevented, and mountability can be reliably improved.

Further, by inclining the joint surfaces M of the flange portions 39, 77, the amount of projection of the high-pressure turbine casing 70 in the lateral direction can be effectively suppressed as compared with a structure in which these joint surfaces M are oriented in the vertical direction, in other words, as compared with a structure in which the casings 70, 34 are arranged in the lateral direction. As a result, interference with peripheral components arranged laterally with respect to the high-pressure stage turbine housing 70 can be effectively prevented in the engine compartment, and mountability can be reliably improved.

[ others ]

The present disclosure is not limited to the above-described embodiments, and can be implemented by being appropriately modified within a scope not departing from the gist of the present disclosure.

For example, in the above-described embodiment, the case where the low-pressure stage turbine casing 34 is disposed obliquely above the high-pressure stage turbine casing 70 and the exhaust collecting portion 32 has been described, but it may be configured to be disposed obliquely below the high-pressure stage turbine casing 70 and the exhaust collecting portion 32. In this case, the fixed flange 39 may be inclined obliquely upward.

Further, the case where the low-pressure stage turbine casing 34 is formed integrally with the exhaust manifold 30 has been described, but they may be formed separately.

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

The present application is based on the japanese patent application filed on 20/2/2019 (japanese patent application 2019-.

Industrial applicability

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

Description of the reference numerals

10 Engine

CH cylinder head

13 exhaust port

30 exhaust manifold

31 exhaust introduction passage part (1 st passage part)

31B the 1 st air introducing port (1 st introducing port)

32 exhaust collecting part (1 st passage part)

33 exhaust gas leading-out passage part (1 st passage part)

33B the 1 st exhaust outlet (the 1 st outlet)

34 low-pressure stage turbine casing

35 Low pressure stage exhaust vortex passage (2 nd passage part)

36 Low-pressure stage exhaust introduction passage part (2 nd passage part)

36B 2 nd air exhaust inlet (2 nd inlet)

37 Low-pressure stage exhaust gas discharge passage part (2 nd passage part)

37B 2 nd exhaust outlet (2 nd outlet)

38 bypass passage portion

39 fixed flange part (flange part)

40 low-pressure stage supercharger

41 low pressure stage turbine

42 low-pressure stage compressor

45 low pressure stage compressor shell

47 low pressure progressive gas vortex path

48 low pressure stage suction passage part

49 low pressure stage discharge path part

60 high-pressure supercharger (other exhaust system devices)

61 high-pressure stage turbine

62 high-pressure stage compressor

70 high pressure stage turbine casing

71 high-pressure stage exhaust swirl passage

72 high-pressure stage exhaust gas introduction passage portion

73 high-pressure stage exhaust gas discharge passage part

80 high-pressure stage compressor shell

81 high-pressure progressive gas vortex passage

82 high-pressure stage suction passage part

83 high pressure stage discharge passage part

90 by-pass valve (valve)

91 driver