JPH0367023A - Exhaust device of engine with supercharger - Google Patents

Abstract

PURPOSE:To enhance the rigidity of an opening part by partitioning a secondary supercharger opening part into a primary opening which corresponds to a primary exhaust gas introduction by a rib part which extends to a direction crossing an upstream end face part. CONSTITUTION:In a secondary supercharger 35 side opening part at branched exhaust passage forming parts 15-17, a rib part 29 which partitions into a primary opening 22 and a secondary opening 23. Consequently, the rigidity is improved, thereby the branched exhaust passage forming parts 15-17 have a sufficient rigidity even at the secondary supercharger 35 side opening part, and heat deformation caused by heat of exhaust gas from an engine body 10 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to guiding exhaust gas from an engine to the outside through a supercharger section comprising at least two sequentially controlled superchargers arranged in parallel. This invention relates to an exhaust system for a supercharged engine.

(Prior art) An engine installed in a vehicle that is equipped with multiple turbo superchargers that use exhaust gas to supercharge intake air in order to more effectively improve intake air filling efficiency. What has been done is known. An engine equipped with such a plurality of turbo superchargers is disclosed in, for example, Japanese Utility Model Application No. 60-178329.
As shown in Japanese Patent Publication No. 60216030, the downstream end of the branch exhaust passage forming part extending from the engine body is connected to the exhaust gas introduction part of each of two turbo superchargers arranged side by side. At the same time, an outlet-side exhaust passage forming part extending from the exhaust gas discharge part side of each turbocharger extends to the outside.

If two turbo superchargers installed in parallel to the engine are subject to sequential control, one of them will be controlled regardless of its operating state when the engine is operating. One is the primary side supercharger into which exhaust gas is introduced, and the other is the primary side supercharger that introduces exhaust gas only when the engine body is in a predetermined operating state, for example, a state in which it operates at a relatively high rotation speed. Therefore, depending on the operating state of the engine, only the primary supercharger operates, or both the primary supercharger and the secondary supercharger operate. is in operation, and supercharging of intake air to the engine body is carried out efficiently in accordance with requests from the engine body.

The primary side and secondary side where sequential control is performed in this way
In an engine equipped with a secondary supercharger, a main exhaust gas inlet and a leakage exhaust gas inlet are formed in the exhaust gas inlet of the secondary supercharger, and the main exhaust gas inlet is The opening and closing of the leaking exhaust gas inlet is controlled by the exhaust gas cut valve, and the opening and closing of the leaking exhaust gas inlet is controlled by the exhaust leaking valve, and the branch exhaust passage forming part is connected to the engine side facing the exhaust port formed in the engine body. An opening, an opening on the primary side turbocharger that faces the exhaust gas inlet formed in the exhaust gas inlet of the primary side turbocharger, and an exhaust gas inlet formed in the exhaust gas inlet of the secondary side turbocharger. A secondary side supercharger side opening that faces the main exhaust gas inlet and the leaked exhaust gas inlet is provided so that the exhaust port formed in the engine body and the primary and secondary side superchargers are connected to each other. An exhaust passage is formed that connects each exhaust gas introduction section. and a state in which the exhaust leak valve and the exhaust cut valve are operated to selectively open the leak exhaust gas inlet and the main exhaust gas inlet, respectively, so that only the primary side supercharger operates; A state is assumed in which both the primary side supercharger and the secondary side supercharger operate.

(Problems to be Solved by the Invention) As described above, the primary side and secondary side superchargers are provided which perform sequential control, and the branch exhaust passage forming section is connected to the exhaust port formed in the engine body. An opening on the engine side that contacts an opening on the primary side of the supercharger, and an opening on the primary side of the supercharger that faces the exhaust gas inlet formed in the exhaust gas inlet of the primary supercharger, and an opening on the exhaust gas inlet of the secondary supercharger. In an engine that is provided with a main exhaust gas inlet formed in the main exhaust gas inlet and a secondary side supercharger side opening that faces the leaky exhaust gas inlet, the branch exhaust passage forming part is A comparatively large secondary exhaust gas inlet opening facing both the main exhaust gas inlet and the leakage exhaust gas inlet formed in the exhaust gas inlet of the secondary turbocharger at the downstream end. is provided, and the secondary supercharger side opening forms a single opening or a pair of mutually adjacent openings facing the main exhaust gas inlet and the leakage exhaust gas inlet, respectively. Become something. Therefore, the rigidity of the branch exhaust passage forming part is considered to be significantly reduced at the secondary side supercharger side opening, and thermal deformation due to the heat of exhaust gas from the engine body occurs, resulting in and a main exhaust gas inlet that causes exhaust gas leakage at the downstream end connected to each exhaust gas inlet of the secondary supercharger, or is formed in the exhaust gas inlet of the secondary supercharger. This may cause problems such as interfering with the proper operation of the exhaust gas cut valve that controls the opening and closing of the valve. In addition, the pulsation of the exhaust gas from the engine body is caused by the relatively large opening on the secondary side supercharger side provided in the branch exhaust passage forming part
There is also the problem that this directly acts on the exhaust leak valve that controls the opening and closing of the leak exhaust gas inlet formed in the exhaust gas inlet of the next supercharger, thereby reducing the durability of the exhaust leak valve.

In view of these points, the present invention provides a primary side supercharger where one side is a primary side supercharger into which exhaust gas is introduced when the engine body is in operation regardless of its operating state, and the other side is a primary side supercharger that is used when the engine body is in a predetermined operation state. Applicable to engines equipped with two turbochargers, which are considered secondary side turbochargers into which exhaust gas is introduced only when the engine body and the primary and secondary side superchargers An engine-side opening that is arranged between the charger and the exhaust port formed in the engine body, and a primary side that is in contact with the exhaust gas inlet formed in the exhaust gas inlet of the primary supercharger. A supercharger-side opening and a secondary-side supercharger-side opening that faces the main exhaust gas inlet and leakage exhaust gas inlet formed in the exhaust gas inlet of the secondary-side supercharger. The branch exhaust passage forming part that is said to be provided with sufficient rigidity also at the opening on the secondary side supercharger side, and is also formed at the exhaust gas introduction part of the secondary side supercharger. For the exhaust leak valve that controls the opening and closing of the leak exhaust gas inlet,
It is an object of the present invention to provide an exhaust system for a supercharged engine that can alleviate pulsation of exhaust gas from an engine body.

(Means for Solving the Problems) In order to achieve the above-mentioned object, an exhaust system for a supercharged engine according to the present invention has an upstream end face connected to the engine body, and a downstream end face that an exhaust gas introduction part of a first supercharger into which exhaust gas is introduced regardless of the operating state of the engine body when the engine body is in operation, and
A branch exhaust passage forming part connected to each of the exhaust gas introduction parts of the second supercharger into which exhaust gas is introduced only when the engine main body is in a predetermined operating state, and a second supercharger. An exhaust cut valve that controls the opening and closing of the first exhaust gas inlet provided in the exhaust gas inlet of the engine, and an exhaust cut valve that controls the opening and closing of the second exhaust gas inlet provided in the exhaust gas inlet of the second supercharger. An exhaust leak valve to be controlled, a connecting exhaust passage forming part that connects the exhaust gas exhaust part of the first supercharger and the exhaust gas exhaust part of the second supercharger, and exhaust gas passing through the connecting exhaust passage forming part. The branch exhaust passage forming part has an engine side opening facing an exhaust port formed in the engine body on the upstream end face, and an outlet side exhaust passage forming part that guides the exhaust gas to the outside. a first turbocharger-side opening facing the exhaust gas introduction part of the first turbocharger; and a second turbocharger-side opening facing the exhaust gas introduction part of the second turbocharger. A section is provided to form an exhaust passage that connects the exhaust port formed in the engine body and the exhaust gas introduction section of each of the first and second superchargers, and the second supercharger side The opening portion is formed by a rib portion extending in a direction intersecting the upstream end face portion, and a second opening corresponding to the first exhaust gas inlet provided in the exhaust gas inlet portion of the second supercharger; and a second opening corresponding to a second exhaust gas inlet provided in the exhaust gas inlet of the second supercharger.

(Function) In the exhaust system for a supercharged engine according to the present invention configured as described above, the second supercharger side opening in the branch exhaust passage forming portion is connected to the first opening and the second opening. The rigidity of the branch exhaust passage forming part is increased by providing the rib part that separates the opening from the second supercharger side opening. It is said that thermal deformation caused by the heat of exhaust gas from the engine is unlikely to occur. In addition, the exhaust gas introduced from the engine body through the exhaust port into the branch exhaust passage forming portion is provided at the rib portion that separates the first opening and the second opening at the second supercharger side opening. After the pulsating flow is alleviated by This will improve sexual performance.

(Example) FIGS. 1 and 2 show an example of an exhaust system for a supercharged engine according to the present invention, together with the main parts of a rotary piston engine in which the exhaust system is used.

1 and 2, the engine main body 10 includes three rotor housings 12 and three rotor housings 1.
4 side housings 1 placed across each of 2
3, and an exhaust manifold 8 is attached to one side surface. A cooling fan 14 is disposed outside the side housing 13 located at one end of the engine body 10. A working chamber is formed inside each of the rotor housings I2 according to the rotation of the rotor, and an exhaust port provided in the rotor housing 12 and communicating with the working chamber is connected to the exhaust port.
Exhaust passages 15, 16 formed in the exhaust manifold 8
and 17, and the downstream ends of the plurality of intake passages formed in the intake manifold 11 are connected to an intake boat provided in the rotor housing 12 and communicating with the working chamber. are connected to each other.

In the exhaust manifold 8, as shown in FIGS. 3A and 3B, at the upstream end of each of the exhaust passages 15 to 17,
Flange portions 15a and 16a in which exhaust gas introduction holes 18 are formed
and 17a are provided, and the exhaust manifold 8 is
Flange portion 15a.

16a and 17a are brought into contact with the engine body 10, and are fixed by bolts passing through the flange portions 15a, 16a and 17a. The thickness of the passage forming part 25 located between the flange part 15a and the flange part 16a is made relatively large, and the thickness of the passage forming part 26 located between the flange part 16a and the flange part 17a is made relatively large. The thickness is considered to be relatively small.

Further, the downstream portion of the exhaust passage 16 has branch portions 16A and 1
6B, a merging part 19 is formed by the downstream part of the exhaust passage 15 and the branch part 16A, and a merging part 21 is formed by the downstream part of the exhaust passage 17 and the branch part 16B. ing. An opening forming part 20 is provided at the downstream end of the merging part 19 , and two mounting holes 24 are provided in the protruding part of the opening forming part 20 toward the cooling fan 14 . A mounting hole portion 27 is provided in a portion on the cooling fan 14 side. On the other hand, at the downstream end of the merging section 2L, an opening forming section 22 is provided with a rib 29 extending toward the engine body 10 in a direction intersecting the end surface thereof.
, and an opening forming part 23 that forms an opening whose diameter is larger than that of the opening formed by the opening forming part 22, and a mounting hole 28 is provided in a portion located near the opening forming part 23. is provided.

The exhaust manifold 8 configured as described above has a first
As shown in the figure, an opening forming part 20 provided in the merging part 19 and an opening forming part 22 provided in the merging part 21
and 23 and ribs 29 are formed on a flange portion 31 forming an exhaust gas introduction portion communicating with the turbine chamber 30A formed on the casing of the primary side supercharger 30, and on the casing of the secondary side supercharger a35, respectively. The opening formed by the opening forming part 20 and the exhaust gas inlet 32a formed in the flange part 3I are fixed in contact with the flange part 36 that constitutes the exhaust gas inlet part communicating with the turbine chamber 35A. Also, the opening formed by the opening forming part 22 and the rib 29 is brought into communication with the exhaust gas inlet 36a formed in the flange part 36, and the opening formed by the opening forming part 23 and the rib 29 is connected. Exhaust gas inlet 36 formed in the opening and flange portion 36
b are brought into communication. Note that an 02 sensor 33 for detecting the oxygen concentration of the exhaust gas passing through the confluence section 19 is disposed in the attachment hole section 27 provided in the exhaust manifold 8.

On the other hand, a cover 37 is provided above the flange portion 36 in the turbine chamber 35A to cover the exhaust gas inlets 36a and 36b and communicate them.
The flange portion 3
The exhaust gas introduction port 36b provided in the opening forming part 2
The exhaust cut valve 39 is rotatably attached to a shaft supported by a mounting hole 28 provided in the exhaust gas cut valve 3, and is opened or closed by an exhaust cut valve 39 whose operation is controlled by an actuator 40. Actuator 40
is a bracket 4 attached to a mounting hole 24 provided on the side of the cooling fan 14 in the exhaust manifold 8.
Supported by 5.

The primary side supercharger 30 and the secondary side supercharger 35 are assumed to be sequentially controlled, and the primary side supercharger 30
However, when the engine body IO is in operation, regardless of its operating state, exhaust gas is introduced into the turbine chamber 30A through the opening formed in the opening forming part 20 of the exhaust manifold 8 and the exhaust gas inlet 31a formed in the flange part 31. When the turbine in the turbine chamber 30A is driven into an operating state, and the secondary supercharger 35 is in a predetermined operating state, for example, , when the rotational speed exceeds a predetermined value, or when the rotational speed does not reach the predetermined value but the amount of intake air exceeds the predetermined value, the turbine chamber 35A is filled with air in the opening forming portion 22 of the exhaust manifold 8. Exhaust gas inlet 3 opened by the formed opening and exhaust leak valve 38
After a relatively small amount of exhaust gas for turbine pre-rotation is introduced through 6a, the opening forming part 2 of the exhaust manifold 8 is introduced.
The exhaust gas is fully introduced through the opening formed in the turbine chamber 3 and the exhaust gas inlet 36b opened by the exhaust cut valve 39.
The turbine within 5A is driven into operation. In this way, after a relatively small amount of exhaust gas for turbine pre-rotation is introduced into the turbine chamber 35A through the exhaust gas inlet 36a which is opened by the exhaust leak valve 38, the exhaust gas is opened by the exhaust cut valve 39. Exhaust gas inlet 36b
By fully introducing exhaust gas into the turbine chamber 35A through the exhaust gas, the shock that occurs when the secondary supercharger 35 is activated is suppressed.

The compressor chamber 30B that accommodates the blower provided in the primary side supercharger 30 is connected to the intake air introduction passage 41 via the intake air introduction part 30a, and is also connected to the secondary side supercharger 835.
Compressor room 35B that accommodates the blower installed in
is connected to the intake air introduction passage 42 via the intake air introduction section 35a.

The intake air introduction passages 41 and 42 are each connected to an intake passage provided with an air filter and the like.

Further, the pressurized intake air delivery section 30b provided in the compressor chamber 30B and the pressurized intake air delivery section 35b provided in the compressor room 35B are connected to a common pressurized intake passage (not shown), and the A downstream portion of the pressure intake passage is connected to a merging portion formed by the upstream end of each branched intake passage provided in the intake manifold 11 . The turbine chamber 30A and compressor chamber 30B of the primary side supercharging [30 are connected via a connecting shaft chamber 30C through which a connecting shaft connecting the turbine and the blower passes, and the secondary side Turbine chamber 3 of supercharger 35
5A and the compressor chamber 35B are the connecting shaft chamber 3 through which the connecting shaft connecting the turbine and the blower passes.
They are connected via 5C.

The primary side and secondary side superchargers 30 and 35 as described above are
Exhaust gas discharge portions 30c and 35c provided in the respective turbine chambers 30A and 35A and facing each other,
A connecting exhaust passage forming part 46 is bolted to both ends of a connecting exhaust passage forming part 46 formed separately from the primary side and secondary side supercharging parts 30 and 35 via gaskets 47 and 48, respectively. and is arranged in parallel with the engine main body IO. The connecting exhaust passage forming part 46 is formed of a material whose coefficient of thermal expansion is larger than that of the exhaust manifold 8, and the thickness of the gas Kent 47 of the 30 primary side superchargers is the same as that of the secondary side. Supercharger 3
The thickness is greater than the thickness of the gasket 48 in the fifth example. Furthermore, an outlet side exhaust passage forming part 50 that guides exhaust gas discharged from the turbine chambers 30A and 35A and passing through the connecting exhaust passage forming part 46 to the outside has an upstream end 50a attached to the connecting exhaust passage forming part 46 and a gasket 49. They are connected by being bolted together. As shown in FIGS. 1 and 2, the outlet side exhaust passage forming part 50 extends obliquely downward by a predetermined distance from the connecting exhaust passage forming part 46,
It is said that it is bent toward the secondary side supercharger 35 side.

An example of the exhaust system according to the present invention configured as described above provides the following advantages.

(1) The rib 29 provided between the opening forming portion 22 and the opening forming portion 23 in the exhaust manifold 8 increases the rigidity of the portion of the exhaust manifold 8 that includes the opening forming portions 22 and 23, so that the exhaust manifold 8 However, the portions including the opening forming portions 22 and 23 have sufficient rigidity, and are capable of absorbing heat caused by the heat of exhaust gas led out from each rotor housing 12 to the exhaust passages 15, 16 and 17 in the engine body 10. It is assumed that deformation does not easily occur. In addition, the exhaust passages 16 and 1 are mainly connected from each rotor housing 12 in the engine body 10.
After the pulsation of the exhaust gas led out to the opening forming part 7 is relaxed by the rib 29 provided between the opening forming part 22 and the opening forming part 23, the exhaust gas acts on the exhaust leakage valve 38. The ribs 29 serve as a buffer against exhaust pulsations, and the durability of the exhaust leak valve 38 is improved.

(2) The actuator 40 is located near the cooling fan 14 in the exhaust manifold 8, relatively distant from the exhaust cut valve 39, but by taking such a position, the stroke of the actuator 40 is Since the length is relatively large, it is possible to downsize the actuator 40, and the actuator 4o is efficiently cooled by the cooling fan 14, thereby reducing the thermal influence of the primary side supercharger 30. is considered to be difficult to influence.

(3) The thickness of the passage forming part 25 in the exhaust manifold 8 is made relatively large, and the passage forming part 2
6 is relatively small, and the 02 sensor 33 is disposed in the confluence part 19, so that the exhaust gas inlets 36a and 36 in the secondary supercharging Ia35 are
b is closed by the exhaust leak valve 38 and the exhaust cant valve 39, and most of the exhaust gas from the engine main body IO is
When the exhaust gas is introduced into the turbine chamber 30A through the exhaust gas inlet 31a in the next supercharger 30 and only the first supercharger 30 is put into operation, the exhaust gas enters the turbine chamber 30A through the exhaust gas inlet 31a.
As a result, when the engine main body 10 is started, the 02 sensor 33 is quickly preheated and brought into normal operating condition at an early stage. Inconveniences such as deformation of the passage forming portion 25 are prevented from occurring, and absorption of exhaust heat by the passage forming portion 26 is made relatively small, contributing to exhaust gas purification. On the other hand, the exhaust gas inlet 36b of the secondary supercharger 35 is opened by the exhaust cut valve 39, and the exhaust gas from the engine body 10 passes through the exhaust gas inlet 31a of the primary supercharger 30 into the turbine chamber. 30A and is also introduced into the turbine chamber 35A through the exhaust gas inlet 36b in the secondary side supercharging Ja35.
Even when both the next side and secondary side superchargers 30 and 35 are activated and the flow rate of exhaust gas is increased, an increase in exhaust resistance due to the 0□ sensor 33 is avoided.

(4) Since the connecting exhaust passage forming portion 46 is formed separately from the primary and secondary superchargers 30 and 35, the primary supercharger 30 Flange portion 31 forming an exhaust gas introduction portion and exhaust gas discharge portion 30c
The casing in which is provided, the flange part 36 forming the exhaust gas introduction part of the secondary side supercharging n35, and the exhaust gas discharge part 3
5c is assumed to have a significant temperature difference and a thermal expansion difference occurs between the casing of the primary side supercharger 30 and the casing of the secondary side supercharger 35. , the difference in thermal expansion between the exhaust gas discharge part 30c of the primary side supercharger 30 and the connecting exhaust passage forming part 46, and the exhaust gas discharge part 35c of the secondary side supercharger 35. This is absorbed by the connecting portion between the connecting exhaust passage forming part 46 and distortions, deformations, etc. occurring in the connecting exhaust passage forming part 46 are reduced.

(5) Since the outlet side exhaust passage forming part 50 is formed separately from the connecting exhaust passage forming part 46, the casing of the primary side supercharger 30 and the secondary side supercharger 35 The influence of the difference in thermal expansion that occurs between the outlet side exhaust passage forming part 50 and the connecting exhaust passage forming part 46 is also alleviated by the connection part between the outlet side exhaust passage forming part 50 and the connecting exhaust passage forming part 46, and the distortion that occurs in the connecting exhaust passage forming part 46 is reduced. Deformation etc. will be further reduced.

(6) Since the outlet side exhaust passage forming part 50 extends obliquely downward by a predetermined distance from the connecting exhaust passage forming part 46 and is bent toward the secondary side supercharger 35, In addition to reducing the size of the entire intake system, the primary side supercharger 30, which tends to reach high temperatures, is prevented from being affected by the heat of the exhaust gas passing through the outlet side exhaust IL path formation 50. A decrease in intake air filling efficiency caused by the supercharger 30 is avoided.

(7) Based on the coefficient of thermal expansion of the exhaust manifold 8, which directly receives high-temperature exhaust gas from the engine body lO, the primary supercharger 30 or both the primary and secondary superchargers 30 and 35 are Since the coefficient of thermal expansion of the connecting exhaust passage forming portion 4G that receives the exhaust gas whose temperature has been lowered through the passage of time is larger, the thermal expansion of the exhaust manifold 8 and the thermal expansion of the connecting exhaust passage forming portion 46 are larger. The exhaust manifold 8 and the connecting exhaust passage forming part 46 are connected to the primary side and secondary side superchargers 30 and 35, respectively, which are approximately the same and connected to both the exhaust manifold 8 and the connecting exhaust passage forming part 46. The distortion caused by the thermal expansion of each is reduced.

(8) Gasket 47 interposed between the exhaust gas discharge part 30c of the primary side supercharger 30 and the connecting exhaust passage forming part 46
is larger than the thickness of the gasket 48 interposed between the exhaust gas discharge part 35c of the secondary side supercharger 35 and the connecting exhaust passage forming part 46, so that the gas is absorbed by the gasket 48. The primary side supercharger 3 is absorbed by the Gaskent 47 compared to the heat influence from the secondary side supercharger 35.
The thermal influence from the primary side supercharger 30 and the secondary side supercharger 3 is said to be larger and is exerted on the connecting exhaust passage forming part 46.
5 is made small, and distortion and deformation occurring in the connecting exhaust passage forming portion 46 are reduced.

Note that in the above example, the actuator 40 is supported by the bracket 45 attached to the protrusion toward the cooling fan 14 side of the exhaust manifold 8; A part of the casing is a protrusion toward the cooling fan 14, and an actuator 40 is attached to a bracket 45 attached to the protrusion.
Further, the actuator 40 is located close to the secondary supercharger 35, where the thermal influence of the secondary supercharger 30 is considered to be small. may be taken as

(Effects of the Invention) As is clear from the above description, in the exhaust system for a supercharged engine according to the present invention, exhaust gas is introduced into one side when the engine body is operating, regardless of its operating state. Two superchargers, one of which is a first supercharger that operates in a specified manner, and the other a second supercharger into which exhaust gas is introduced only when the engine body is in a predetermined operating state. In an engine equipped with an engine, the branch exhaust passage forming portion disposed between the engine body and each of the first and second superchargers is an engine-side opening that faces an exhaust port formed in the engine body. , a first supercharger-side opening facing an exhaust gas inlet formed in the exhaust gas inlet of the first supercharger;
and a first exhaust gas inlet that is formed in the exhaust gas inlet of the second supercharger and is opened and closed by an exhaust cut valve, and a second exhaust gas inlet that is opened and closed by an exhaust leak valve;
A second supercharger-side opening is provided, which has first and second openings facing each other, and is provided with a rib portion that separates the first opening and the second opening. Ru. Thereby,
The rigidity of the second supercharger-side opening in the branch exhaust passage forming portion is increased by the rib portion that separates the first opening and the second opening. It has sufficient rigidity even at the opening on the turbocharger side.
It is designed to be resistant to thermal deformation due to the heat of exhaust gas from the engine body, and as a result, exhaust gas leakage does not occur at the connection points with the exhaust gas introduction parts of the first and second superchargers. It shall not cause any inconvenience, such as damage to the exhaust valve or the proper operation of the exhaust cut valve.

In addition, the exhaust gas introduced from the engine body through the exhaust port into the branch exhaust passage forming part is passed through the rib portion that separates the first opening and the second opening in the second supercharger side opening. After the pulsating flow is alleviated by
This will improve the durability of the exhaust leak valve.

[Brief explanation of drawings]

1 and 2 are a schematic plan view and a side view showing an example of the exhaust system for a supercharged engine according to the present invention together with the main parts of a rotary piston engine to which it is applied;
Figures A and B are side and front views of the exhaust manifold. In the figure, 8 is the exhaust manifold, 10 is the engine body, 1
5 to 17 are exhaust passages, 29 is a rib, 22 and 23 are opening forming parts, 30 is a primary side supercharger, 31 and 36 are flange parts, 35 is a secondary side supercharger, 38 is an exhaust leakage valve, 39 is an exhaust cut valve.

Claims (1)

[Scope of Claims] The upstream end face is connected to the engine body, and the downstream end face is configured to introduce exhaust gas regardless of the operating state of the engine body when the engine body is operated. Connected to the exhaust gas introduction part of the first supercharger and the exhaust gas introduction part of the second supercharger into which exhaust gas is introduced only when the engine main body is in a predetermined operating state. an exhaust gas cut valve for controlling opening/closing of a first exhaust gas inlet provided in the exhaust gas inlet of the second supercharger, and an exhaust gas inlet of the second supercharger. an exhaust leak valve for controlling opening/closing of a second exhaust gas inlet provided in the gas inlet; an exhaust gas discharge part of the first supercharger; and an exhaust gas discharge part of the second supercharger. It comprises a connecting exhaust passage forming part that connects, and an outlet side exhaust passage forming part that guides the exhaust gas through the connecting exhaust passage forming part to the outside, and the branch exhaust passage forming part has the above-mentioned branch exhaust passage forming part on the upstream end surface. an engine-side opening that contacts an exhaust port formed in the engine body, and a first supercharger-side opening that contacts the exhaust gas introduction portion of the first supercharger on the downstream end surface;
and a second supercharger-side opening facing the exhaust gas inlet of the second supercharger, so that the exhaust port and the exhaust gas of the first and second superchargers are connected to each other. The second supercharger side opening corresponds to the first exhaust gas inlet by a rib portion extending in a direction intersecting the upstream end face. a first opening;
An exhaust system for a supercharged engine, characterized in that the exhaust system is divided into a second opening corresponding to the second exhaust gas inlet.