JP2010281308A - Supercharging device and internal combustion engine equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supercharging device suppressed in increase of size, and an internal combustion engine equipped with the same. <P>SOLUTION: A multistage supercharging device includes a high-pressure supercharger 40 having a high-pressure side compressor chamber 43 and a low-pressure supercharger 50 having a low-pressure side compressor chamber 53. The multistage supercharging device is provided with an intake side connection device 7 having an inlet side connection passage 61 for supplying air to the low-pressure side compressor chamber 53 and an outlet side connection part 62 for discharging air from the high-pressure side compressor chamber 43, and the intake side connection device 7 is provided as a block body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a supercharging device including a first supercharger having a first compressor chamber and a second supercharger having a second compressor chamber.

  In the internal combustion engine, for the purpose of improving the supercharging characteristics of the intake air, a high-pressure stage and a low-pressure stage compressor wheel are provided in series in the intake passage, and the high-pressure stage and the low-pressure stage are provided in the exhaust passage. A turbine wheel having a so-called multistage supercharging device in which the turbine wheel is provided in series with respect to the flow direction of exhaust gas is known. An example of an internal combustion engine provided with such a multistage supercharging device is that disclosed in Patent Document 1.

With reference to FIG. 12, an internal combustion engine provided with a multistage supercharging device having a conventional structure will be described.
As shown in FIG. 12, the internal combustion engine 100 is supplied with air to the internal combustion engine main body 120 via an intake manifold 111 provided in the intake passage 110. Exhaust gas burned in the internal combustion engine main body 120 is discharged to the exhaust passage 130 via the exhaust manifold 112.

  A low-pressure compressor chamber 151 of a low-pressure supercharger 150 is connected to the intake passage 110 via a first connection pipe 140, and a high-pressure supercharger 160 is connected to the intake downstream side of the compressor chamber 151 via a second connection pipe 141. A high-pressure side compressor chamber 161 is connected. The first connection pipe 140 is provided with a third connection pipe 142 that is a bypass pipe that branches from the first connection pipe 140 and bypasses the high-pressure compressor chamber 161 and connects to the second connection pipe 141. The third connection pipe 142 is provided with a switching valve 170 that switches between a state in which the intake air supplied to the first connection pipe 140 is supplied to the high-pressure compressor chamber 161 and a state in which the intake air is supplied to the third connection pipe 142. . Further, a fourth connection pipe 143 for connecting to the intake manifold 111 is provided on the intake downstream side of the high-pressure side compressor chamber 161.

  An exhaust manifold 112 is connected to the exhaust passage 130 by a first connection pipe 180, and a high-pressure turbine chamber 162 of the high-pressure supercharger 160 is connected to the exhaust downstream side of the first connection pipe 180 by a second connection pipe 181. The low-pressure turbine chamber 152 of the low-pressure supercharger 150 is connected by the third connection pipe 182. A switching valve 190 is provided in the third connection pipe 182. The switching valve 190 switches between a state in which the exhaust gas supplied to the first connection pipe 180 is supplied to the high pressure side turbine chamber 162 and a state in which the exhaust gas is supplied to the low pressure side turbine chamber 152. The high pressure side turbine chamber 162 and the low pressure side turbine chamber 152 are connected by connecting the fourth connection pipe 183 to the third connection pipe 182.

JP 2005-98250 A

  By the way, in the said supercharging device, since the high pressure supercharger 160 and the low pressure supercharger 150 are connected by a plurality of pipes of the first connection pipe 140 to the fourth connection pipe 143, the connection structure is complicated. As a result, the pipes may interfere with each other. The same applies to the exhaust side connection structure. Such a problem is not limited to the multi-stage supercharging device, and can be said to occur similarly if the structure of the supercharging device includes a plurality of superchargers.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a supercharging device that simplifies the arrangement structure of pipes connected to a plurality of superchargers, and an internal combustion engine including the same. There is.

In the following, means for achieving the above object and its effects are described.
(1) The invention described in claim 1 is a supercharging device including a first supercharger having a first compressor chamber and a second supercharger having a second compressor chamber. An intake-side connecting device having an inlet-side intake passage for supplying air to the first compressor chamber and an outlet-side intake passage for discharging air from the second compressor chamber is provided, and the intake-side connecting device includes a block body The gist is to be configured as.

  According to the present invention, when the intake side connecting device configured as a block body forms the inlet side intake passage and the outlet side intake passage, the inlet side intake passage and the outlet side intake passage are provided as separate pipes. As compared with the above, the arrangement structure of the pipes connected to the first supercharger and the second supercharger can be simplified.

  (2) The invention according to claim 2 is the supercharging device according to claim 1, wherein the intake side connecting device is connected to the intake air passage for communication between the first compressor chamber and the second compressor chamber. Is provided.

  According to the present invention, since the intake side connection device forms the communication intake passage, the first supercharger is compared with the case where the communication intake passage and the intake side connection device are provided as separate pipes. And the arrangement structure of the pipes connected to the second supercharger can be simplified and the number of the pipes can be reduced.

  (3) According to a third aspect of the present invention, in the supercharging device according to the second aspect, the intake side connecting device is provided with a low pressure side intake passage for discharging air from the first compressor chamber. Is the gist.

  According to the present invention, since the intake side connection device forms the low pressure side intake passage, the first supercharger and the second supercharger are compared with the case where the low pressure side intake passage and the intake side connection device are provided separately. The arrangement structure of the pipes connected to the feeder can be simplified.

  (4) According to a fourth aspect of the present invention, in the supercharging device according to the third aspect, the low pressure side intake passage is provided with a switching valve for switching an open / close state of a passage of the air flowing in the low pressure side intake passage. The gist is to be provided.

  According to the present invention, since the switching valve is provided in the low-pressure side intake passage, it is possible to suppress an increase in the size of the intake-side connection device compared to the case where the switching valve is provided in the passage outside the low-pressure side intake passage. become able to.

  (5) The invention according to claim 5 is the supercharging device according to claim 3 or 4, wherein in the intake side connection device, the discharge port of the outlet side intake passage and the discharge of the low pressure side intake passage are provided. The outlet is provided on the same surface, and the discharge port of the outlet side intake passage and the discharge port of the low pressure side intake passage are connected by a common connection pipe.

  In the case where the intake air in the outlet side intake passage and the intake air in the low pressure side intake passage are merged, in the structure where the discharge port of the outlet side intake passage and the discharge port of the low pressure side intake passage are provided on different surfaces, It is necessary to make it the structure which joins these piping, after providing piping separately. In that respect, in the present invention, the discharge port of the outlet side intake passage and the discharge port of the low pressure side intake passage are provided on the same surface in the intake side connection device and are connected by a common pipe. Can be omitted. Therefore, the number of pipes connected to the first supercharger and the second supercharger can be reduced.

  (6) The invention according to claim 6 is the supercharging device according to any one of claims 1 to 5, wherein the inlet port of the inlet side intake passage is the first port in the intake side connection device. The gist is that the first supercharger is provided on a surface different from the surface on which the second supercharger is disposed and the surface on which the second supercharger is disposed.

  According to this invention, the suction port of the inlet side intake passage is different from the surface on the side where the first supercharger is disposed in the intake side connection device and the surface on the side where the second supercharger is disposed. Accordingly, the pipe connected to the suction port can be arranged in a space away from the first supercharger and the second supercharger. Therefore, it is possible to easily set a layout that can easily avoid interference between the pipe and the first and second superchargers.

  (7) The invention according to claim 7 is the supercharging device according to claim 6, wherein the outlet of the outlet side intake passage is on the side where the first supercharger is arranged in the intake side connecting device. In summary, the second supercharger is disposed on a surface different from the surface on which the second supercharger is disposed and the surface on which the suction port of the inlet-side intake passage is disposed.

  According to the present invention, the discharge port of the outlet side intake passage has a surface on the side where the first supercharger is disposed in the intake side connection device, a surface on the side where the second supercharger is disposed, and the inlet side intake passage. By making the surface different from the surface on which the suction port is provided, the piping connected to the discharge port can easily set the layout of the piping that avoids interference with the first supercharger and the second supercharger. Can do. Furthermore, by providing the discharge port on a different surface from the suction port, it is possible to easily set a layout of the pipe that avoids interference between the pipe connected to the discharge port and the pipe connected to the suction port.

  (8) The invention according to claim 8 is the supercharging device according to any one of claims 1 to 7, wherein the intake side connection device is connected to a communication path of a blow-by gas reduction device. It is summarized that a blowby gas communication path is provided.

  According to the present invention, since the intake side connection device forms the blow-by gas communication passage, the first supercharger and the structure in which the intake side connection device and the blow-by gas communication passage are provided as separate pipes are provided. The arrangement structure of piping connected to the second supercharger can be simplified.

(9) The invention according to claim 9 is the supercharging device according to claim 8, wherein the blow-by gas communication passage is connected to the inlet side intake passage.
According to this invention, compared with the case where the blow-by gas communication passage and the inlet-side intake passage are connected outside the intake-side connection device, it is possible to suppress an increase in the size of the entire supercharging device. It becomes like this.

  (10) The invention according to claim 10 is the supercharging device according to any one of claims 1 to 9, wherein the intake side connection device is connected to an exhaust gas recirculation passage of the exhaust gas recirculation device. The exhaust gas recirculation communication passage is provided.

  According to the present invention, since the intake side connection device forms the exhaust gas recirculation communication passage, the first supercharger and the exhaust gas recirculation communication passage are compared with the structure in which the intake side connection device and the exhaust gas recirculation communication passage are provided as separate pipes. The arrangement structure of piping connected to the second supercharger can be simplified.

(11) The invention according to claim 11 is the supercharging device according to claim 10, characterized in that the exhaust gas recirculation passage is connected to the inlet side intake passage.
According to this invention, compared with the case where the exhaust gas recirculation communication passage and the inlet side intake passage are connected outside the intake side connection device, it is possible to suppress an increase in the size of the entire supercharging device. It becomes like this.

  (12) The invention according to claim 12 is the supercharging device according to claim 10 or 11, wherein a connection port of the exhaust gas recirculation passage connected to the exhaust gas recirculation passage is the first supercharger. A surface on which the engine is disposed, a surface on which the second supercharger is disposed, a surface on which the suction port of the inlet side intake passage is provided, and a surface on which the discharge port of the outlet side intake passage is provided. The gist is that they are provided on different surfaces.

  According to this invention, the connection port of the exhaust gas recirculation passage is provided on a surface different from the surface on the side where the first supercharger is disposed in the intake side connection device and the surface on the side where the second supercharger is disposed. Therefore, the layout of the communication path that avoids interference between the communication path of the exhaust gas recirculation device and the first supercharger and the second supercharger can be easily set. Furthermore, since the inlet side intake passage is provided on the surface where the inlet port is provided and the surface where the inlet side of the outlet side intake passage is provided and the connection port are different from each other, piping connected to the communication passage and the inlet port, and It becomes possible to easily set the layout of the communication path that avoids interference with the pipe connected to the discharge port.

  (13) The invention according to claim 13 is the supercharging device according to any one of claims 1 to 12, wherein the suction port of the first compressor chamber is a suction port of the second compressor chamber. The main point is that they are arranged opposite to each other.

  (14) The invention according to claim 14 is the supercharging device according to claim 13, wherein the intake side connection device is provided between the first compressor chamber and the second compressor chamber. And

  According to the present invention, the overall size of the intake side connection device is increased as compared with the structure in which the intake side connection device is provided in the supercharger arrangement structure in which the first compressor chamber and the second compressor chamber are separated from each other. Can be suppressed.

  (15) The invention according to claim 15 is the supercharging device according to claim 14, wherein the physique of the first supercharger is configured to be smaller than the physique of the second supercharger, and the intake side The connecting device and the second supercharger are fixed to each other by bolts, and the bolts are inserted from a surface of the intake side connecting device opposite to the surface on which the second supercharger is disposed. This is the gist.

  According to the present invention, the bolt is inserted from the second supercharger to the first supercharger by inserting the bolt from the first supercharger having the small physique to the second supercharger having the large physique. Compared to the above, the increase in size of the intake side connection device can be suppressed.

  (16) The invention according to claim 16 is the supercharging device according to any one of claims 1 to 15, wherein the discharge port of the first compressor chamber and the suction port of the first compressor chamber The discharge port of the second compressor chamber and the suction port of the second compressor chamber are inserted into corresponding openings of the intake side connection device, and the discharge port of the first compressor chamber and the first compressor The gist is that an elastic member is provided between at least one of the suction port of the chamber, the discharge port of the second compressor chamber, and the suction port of the second compressor chamber and the opening.

  According to the present invention, since the elastic member is interposed between the first compressor chamber or the second compressor chamber and the intake side connection device, thermal expansion occurs as the first supercharger and the second supercharger become high temperature. Even if it does, the shift | offset | difference by the thermal expansion can be absorbed now by the elastic deformation of an elastic member.

  (17) The invention according to claim 17 is the internal combustion engine including the supercharging device according to any one of claims 13 to 16, wherein the first turbocharger includes a first turbine chamber. The second turbocharger is provided with a second turbine chamber, and the first turbine chamber and the second turbine chamber are provided between the first turbine chamber and the second turbine chamber. A communication exhaust passage communicating with each other is provided, and the communication exhaust passage is provided integrally with the exhaust manifold.

  According to the present invention, since the communication exhaust passage is provided integrally with the exhaust manifold, compared to the case where the communication exhaust passage and the exhaust manifold are provided separately from each other as separate members, An increase in the size of the entire apparatus can be suppressed.

  (18) The invention according to claim 18 is the supercharging device according to any one of claims 1 to 17, wherein the first supercharger and the second supercharger are configured to flow air. Connected in series in the direction, the first supercharger has a higher compression ratio than the second supercharger, and the second supercharger is more compact than the first supercharger. The main point is that it is large.

The schematic diagram which shows typically the structure of an internal combustion engine provided with the supercharging device about embodiment which actualized the supercharging device of this invention. The top view which shows the arrangement | positioning aspect and connection aspect of the supercharging device and an exhaust manifold about the supercharging device of the embodiment. The enlarged view which shows the enlarged structure of FIG. 2 which shows the whole structure of the supercharger about the supercharger of the embodiment. The perspective view which shows the perspective structure of the intake side connection apparatus of the supercharger about the supercharger of the embodiment. The top view which shows the planar structure which looked at the intake side connection apparatus from 5 directions about the supercharging device of the embodiment. (A) Sectional drawing which shows sectional structure of intake side connection apparatus, (b) Sectional drawing which shows sectional structure in section BB of (a) about the supercharging device of the embodiment. Regarding the exhaust manifold to which the supercharging device of the embodiment is connected, (a) a schematic cross-sectional view showing the internal structure of the manifold and a connection mode between the manifold and the supercharging device, and (b) a cross-sectional line A- in FIG. Sectional drawing which shows the cross-sectional structure cut | disconnected by A. FIG. Regarding the supercharging device of the embodiment, (a) a plan view showing a flow of intake air in the intake side supercharging passage of the supercharging device when the engine load is low, (b) an exhaust side supercharging passage of the supercharging device Sectional drawing which shows the flow of exhaust. Regarding the supercharging device of the same embodiment, (a) a plan view showing the flow of intake air in the intake side supercharging passage of the supercharging device when the engine load is medium load and high load, (b) the exhaust side of the supercharging device Sectional drawing which shows the flow of the exhaust_gas | exhaustion of a supercharging passage. About the supercharging apparatus of other embodiment, (a) The schematic diagram which shows the arrangement | positioning aspect of the supercharging apparatus and an exhaust manifold, (b) The schematic diagram which shows the other arrangement | positioning aspect of the supercharging apparatus and an exhaust manifold. About another supercharging device in other embodiments, (a) a schematic diagram showing an arrangement mode of the supercharging device and an exhaust manifold, (b) a schematic diagram showing another arrangement mode of the supercharging device and the exhaust manifold Figure. The schematic diagram which shows typically the structure of an internal combustion engine provided with the supercharging device about the conventional supercharging device.

  With reference to FIGS. 1 to 9, an embodiment in which the multistage supercharging device of the present invention is embodied as a multistage supercharging device mounted on a diesel engine (hereinafter, “engine 1”) will be described. The engine 1 of this embodiment has a configuration of in-line four cylinders in which four cylinders are arranged in series.

  As shown in FIG. 1, an engine body 10 of the engine 1 includes an intake device 20 that supplies air (hereinafter referred to as “intake air”) taken into the engine 1 from the outside to the engine body 10, and an exhaust from the engine body 10. An exhaust device 30 for discharging the generated gas (hereinafter referred to as “exhaust”) to the outside is connected. An air-fuel mixture of intake air and fuel is supplied to the combustion chamber 11 of the engine body 10, and the engine 1 obtains a driving force by being fueled in the combustion chamber 11.

  The engine 1 includes a multistage supercharger 4 that supercharges intake air in the intake device 20 by exhaust gas flowing in the exhaust device 30, and an exhaust device 30 between the exhaust device 30 and the intake device 20. An exhaust gas recirculation device 9 that recirculates exhaust gas to the intake device 20 is provided. Further, a blow-by gas reduction device 5 is provided for reducing blow-by gas leaking from between the piston and cylinder in the engine body 10 to the intake device 20.

  The intake device 20 is provided with an intake pipe 21 through which intake air flows and an intake manifold 22 that supplies intake air from the intake pipe 21 to each cylinder of the engine body 10. An intake passage 23 is formed from the inlet of the intake pipe 21 to the outlet of the intake manifold 22. The intake pipe 21 includes an air cleaner 24 that captures foreign matters such as dust contained in the outside air in order from the intake upstream side, an intercooler 25 that cools the intake air in the intake passage 23, and an intake air amount that is supplied into the intake pipe 21. And a diesel throttle 26 for adjusting the pressure.

  The exhaust device 30 is provided with an exhaust pipe 31 through which exhaust gas flows and an exhaust manifold 32 that supplies exhaust gas from the combustion chamber 11 to the exhaust pipe 31. An exhaust passage 33 is formed from the inlet of the exhaust pipe 31 to the outlet of the exhaust manifold 32. The exhaust pipe 31 is provided with an exhaust purification device 34 that purifies the exhaust.

  The multistage supercharger 4 includes a high pressure supercharger 40 and a low pressure supercharger 50, and a connection device 6 that connects the high pressure supercharger 40 and the low pressure supercharger 50 to each other. The high-pressure supercharger 40 is set smaller than the low-pressure supercharger 50, and the expansion ratio and compression ratio are set larger.

  A high-pressure turbine chamber 42 and a high-pressure compressor chamber 43 are formed in the housing 41 of the high-pressure supercharger 40. The high-pressure turbine chamber 42 is provided with a turbine wheel 45 that rotates by exhaust. The high-pressure side compressor chamber 43 is provided with a compressor wheel 46 that supercharges intake air. These wheels are connected by a rotor shaft 47.

  A low pressure side turbine chamber 52 and a low pressure side compressor chamber 53 are formed in the housing 51 of the low pressure supercharger 50. The low-pressure turbine chamber 52 is provided with a turbine wheel 55 that rotates by exhaust. The low-pressure side compressor chamber 53 is provided with a compressor wheel 56 that supercharges intake air. These wheels are connected by a rotor shaft 57.

  The connecting device 6 includes an intake-side connecting device 7 having an intake-side supercharging passage 70 that constitutes an intake-side passage of the multistage supercharging device 4, and an exhaust-side supercharging passage that constitutes an exhaust-side passage of the device 4. The exhaust-side connection device 8 having 80. The intake-side supercharging passage 70 also serves as an intake passage between the air cleaner 24 and the intercooler 25 in the intake passage 23, and the exhaust-side supercharging passage 80 is connected to the exhaust manifold 32 in the exhaust passage 33 and the exhaust manifold 32. It also serves as an exhaust passage 33 with the purification device 34.

  The intake-side supercharging passage 70 has an inlet-side intake passage 71 that is a passage that connects the air cleaner 24 and the low-pressure side compressor chamber 53, and an outlet-side intake air that is a passage that connects the intercooler 25 and the high-pressure side compressor chamber 43. A passage 72, a low pressure side intake passage 73 that is a passage connecting the intercooler 25 and the low pressure side compressor chamber 53, and a communication intake passage that is a passage connecting the low pressure side compressor chamber 53 and the high pressure side compressor chamber 43 to each other. 74 is provided. In this low pressure side intake passage 73, intake side switching for switching between a state in which the intake air in the communication intake passage 74 is supplied to the high pressure side compressor chamber 43 and a state in which the intake air is supplied directly to the intercooler 25 without passing through the compressor chamber 43 is provided. A valve 75 is provided.

  The exhaust-side supercharging passage 80 includes an inlet-side exhaust passage 81 that is a passage connected to the exhaust manifold 32, and a high-pressure side exhaust that is a passage connected to the inlet-side exhaust passage 81 and connected to the high-pressure side turbine chamber 42. A passage 82 and a low pressure side exhaust passage 83 that is connected to the inlet side exhaust passage 81 and connected to the low pressure side turbine chamber 52 are provided. The high pressure side turbine chamber 42 is provided with a communication exhaust passage 84 connected to the turbine chamber 42 and connected to the low pressure side exhaust passage 83. The low pressure side exhaust passage 83 is switched between a state in which the exhaust gas in the inlet side exhaust passage 81 is supplied to the high pressure side turbine chamber 42 and a state in which the exhaust gas is supplied directly to the low pressure side turbine chamber 52 without passing through the turbine chamber 42. An exhaust side switching valve 85 is provided.

  The exhaust gas recirculation device 9 is provided with a communication pipe 9 a that connects the exhaust manifold 32 and the intake pipe 21 to each other. The exhaust passage 33 and the intake passage 23 communicate with each other through the exhaust gas recirculation passage in the communication pipe 9a. The communication pipe 9a is provided with an EGR cooler 9b that cools the exhaust gas from the combustion chamber 11, and an EGR valve 9c that switches between communication and blocking of the passage in the communication pipe 9a. By this exhaust gas recirculation device 9, a part of the exhaust gas in the exhaust passage 33 is mixed with the intake air in the intake passage 23 while being cooled via the EGR cooler 9b, and then supplied again into the combustion chamber 11. It becomes like this.

  The blow-by gas reduction device 5 is provided with a communication pipe 5 a that connects the crank chamber of the engine body 10 and the intake passage 23 to each other. The communication pipe 5 a is connected to the intake side connection device 7 in the intake passage 23. Thereby, the blow-by gas leaking from the combustion chamber 11 of the engine body 10 is returned to the intake passage 23 via the communication pipe 5a.

With reference to FIG. 2, the arrangement | positioning aspect of the high pressure supercharger 40, the low pressure supercharger 50, and the exhaust manifold 32 is demonstrated.
As shown in FIG. 2, the exhaust manifold 32 is attached to the engine body 10 (see FIG. 1) via bolts. The exhaust manifold 32 is provided with a housing main body portion 32a that constitutes an outer frame thereof. The housing main body 32a is provided with a main body mounting portion 32b for mounting to the engine main body 10 and a manifold side mounting portion 32c for mounting the high-pressure supercharger 40 and the low-pressure supercharger 50, respectively. . Hereinafter, the axial direction of the cylinder is referred to as “engine height direction X1”, and the arrangement direction of the cylinders is referred to as “engine length direction X2”.

  The high pressure supercharger 40 and the low pressure supercharger 50 are provided above the engine height direction X1 of the exhaust manifold 32. In the engine height direction X <b> 1, the high pressure supercharger 40 is provided slightly below the low pressure supercharger 50. Further, an exhaust purification device 34 is attached below the exhaust manifold 32 in the engine height direction X1. That is, in the engine height direction X1, the high pressure supercharger 40, the low pressure supercharger 50, and the exhaust purification device 34 are provided on the opposite sides with respect to the exhaust manifold 32.

  In the engine length direction X2, the high-pressure supercharger 40 and the low-pressure supercharger 50 have the suction port 43a of the high-pressure side compressor chamber 43 and the suction port 53a of the low-pressure side compressor chamber 53 facing each other. Further, the axial direction of the rotor shaft 47 of the high-pressure supercharger 40 and the axial direction of the rotor shaft 47 of the low-pressure supercharger 50 are parallel to each other and parallel to the engine length direction X2. Is provided.

  On the discharge side of the high-pressure turbine chamber 42 in the housing 41 of the high-pressure supercharger 40, a first discharge-side connection portion 41a extending along the axial direction of the rotor shaft 47, and the exhaust manifold 32 from the first discharge-side connection portion 41a. And a second discharge-side connecting portion 41b that bends toward the bottom. At the tip of the second discharge side connecting portion 41b, a supercharger side attaching portion 41c attached to the manifold side attaching portion 32c is provided. An opening provided in the supercharger side mounting portion 41 c forms a discharge port of the high pressure side turbine chamber 42. The high pressure supercharger 40 is fixed to the exhaust manifold 32 by bringing the supercharger side mounting portion 41 c into contact with the manifold side mounting portion 32 c and fixing them with bolts.

  On the discharge side of the low-pressure turbine chamber 52 of the low-pressure supercharger 50, a first discharge-side connection portion 51a extending along the axial direction of the rotor shaft 57, and bent toward the exhaust manifold 32 from the first discharge-side connection portion 51a. And a second discharge side connecting portion 51b. At the tip of the second discharge side connecting portion 51b, a supercharger side attaching portion 51c attached to the manifold side attaching portion 32c is provided. An opening provided in the supercharger side mounting portion 51 c forms a discharge port of the low pressure side turbine chamber 52. The low-pressure supercharger 50 is fixed to the exhaust manifold 32 by bringing the supercharger-side mounting portion 51c into contact with the manifold-side mounting portion 32c and fixing them with bolts.

  An intake side connection device 7 is provided between the high pressure side compressor chamber 43 and the low pressure side compressor chamber 53 in the engine length direction X2. The intake side connection device 7 is configured by a block body formed of a rectangular parallelepiped. The intake side connection device 7 is configured such that the size of the side along the engine height direction X1 is larger than the size of the side along the engine length direction X2.

  The intake side connection device 7 of the multistage supercharging device 4 will be described with reference to FIGS. Note that the cross-sectional structure of FIG. 3 shows an enlarged cross-sectional structure of a connection portion between the intake side connection device 7 and the high-pressure supercharger 40.

  As shown in FIG. 3, the intake side connection device 7 is integrated with the connection body portion 70a of the block body and the outside of the connection body portion 70a, and intake air is supplied from the intake passage 23 (see FIG. 1). And an outlet pipe 77 for supplying the intake air in the intake side connection device 7 to the intake passage 23. The connection main body portion 70a is formed with an intake side connection portion 60 that is a communication passage that communicates with the inside of the main body portion 70a.

  The connection main body 70a is formed into a rectangular parallelepiped by casting (preferably gravity casting) using aluminum or an aluminum alloy as a material. In the surface constituting the connection main body portion 70a, the inlet pipe 76 is provided on the upper surface in the engine height direction X1 (hereinafter referred to as “inlet surface 7a”). Further, the outlet pipe 77 is provided on a lower surface in the engine height direction X1 (hereinafter, “exit surface 7d”). Hereinafter, on the surface of the connection main body 70a, the surface on the side where the low-pressure supercharger 50 is disposed is referred to as “low-pressure supercharger surface 7b”, and the surface on which the high-pressure supercharger 40 is disposed is referred to as “high-pressure supercharger”. It is referred to as “supply surface 7c”.

The intake side connection portion 60 is configured by an inlet side connection passage 61, a low pressure side connection passage 62, a high pressure side connection passage 63, and a communication connection passage 64.
The inlet side connection passage 61 is provided with a suction port 61a on the inlet surface 7a of the connection main body 70a and a discharge port 61b on the low pressure supercharger surface 7b. The suction port 61 a is connected to the outlet of the inlet pipe 76, and the discharge port 61 b is connected to the suction port 53 a of the low-pressure side compressor chamber 53. The inlet side connecting passage 61 includes a first connecting passage 61c extending downward from the inlet surface 7a in the engine height direction X1, and a second bent bent substantially perpendicularly from the first connecting passage 61c toward the low pressure supercharger surface 7b. It is a substantially L-shaped through hole constituted by the connection passage 61d.

  In the low pressure side connection passage 62, a suction port 62a is provided in the low pressure supercharger surface 7b, and a discharge port 62b is provided in the outlet surface 7d. The suction port 62 a of the low pressure side connection passage 62 is connected to the discharge port of the low pressure side compressor chamber 53, and the discharge port 62 b is connected to the inlet of the outlet pipe 77. The low-pressure side connection passage 62 has a first connection passage 62c extending from the low-pressure supercharger surface 7b toward the high-pressure supercharger 40 in the engine length direction X2, and a substantially vertical direction from the first connection passage 62c to the outlet surface 7d. This is a substantially L-shaped through-hole formed by the second connection passage 62d that bends to the right.

  In the middle of the low-pressure side connection passage 62, a communication connection passage 64 branched from the connection passage 62 is provided. This connection passage 64 for communication is provided with a discharge port 64a on the high-pressure supercharger surface 7c. The discharge port 64 a is connected to the suction port 43 a of the high-pressure side compressor chamber 43. As a result, the communication connection passage 64 allows the low-pressure side compressor chamber 53 and the high-pressure side compressor chamber 43 to communicate with each other.

  An intake side switching valve 75 is provided in the second connection passage 62 d in the low pressure side connection passage 62. The intake side switching valve 75 supplies the intake air from the discharge port 53b of the low pressure side compressor chamber 53 to the high pressure side compressor chamber 43 via the communication connection passage 64, and the intake air via the low pressure side connection passage 62. To the state of being supplied to the outlet pipe 77. Specifically, when the intake side switching valve 75 is closed, the intake air is supplied to the high-pressure side compressor chamber 43 via the communication connection passage 64. On the other hand, when the intake side switching valve 75 is opened, the intake air is supplied to the outlet pipe 77 via the low pressure side connection passage 62.

  In the high-pressure side connection passage 63, a suction port 63a is provided on the high-pressure supercharger surface 7c, and a discharge port 63b is provided on the outlet surface 7d. The suction port 63 a is connected to the discharge port of the high-pressure side compressor chamber 43, and the discharge port 63 b is connected to the inlet of the outlet pipe 77. The high-pressure side connection passage 63 is bent substantially vertically from the high-pressure supercharger surface 7c toward the low-pressure supercharger 50 side in the engine length direction X2 and from the first passage 63c toward the outlet surface 7d. And a second passage 63d. As described above, the outlet pipe 77 is connected to both the discharge port 62 b of the low-pressure side connection passage 62 and the discharge port 63 b of the high-pressure side connection passage 63. In the engine length direction X2, the discharge port 62b of the low-pressure side connection passage 62 and the discharge port 63b of the high-pressure side connection passage 63 are adjacent to each other. The discharge port 62 b of the low pressure side connection passage 62 is provided on the low pressure supercharger 50 side than the discharge port 63 b of the high pressure side connection passage 63. Further, in the engine length direction X <b> 2, the low pressure side connection passage 62 is provided closer to the low pressure supercharger 50 than the high pressure side connection passage 63.

Here, the relationship between the intake side supercharging passage 70 and each connection portion provided in the intake side connection device 7 is as follows.
That is, the inlet side intake passage 71 is configured by a passage in the inlet pipe 76 and the inlet side connection passage 61. The low-pressure side intake passage 73 is constituted by a low-pressure side connection passage 62 and a passage in the outlet pipe 77. The communication intake passage 74 includes a communication connection passage 64. The outlet side intake passage 72 is constituted by a high pressure side connection passage 63 and a passage in the outlet pipe 77. With the above configuration, the inlet side intake passage 71 to the communication intake passage 74 are formed integrally with the intake side connection device 7.

Further, a connection mode between the high pressure supercharger 40 and the low pressure supercharger 50 and the intake side connection device 7 will be described.
As shown in the enlarged sectional view of FIG. 3, a cylindrical suction side connection portion 43c having a suction port 43a of the high pressure side compressor chamber 43 and a discharge port 64a of a communication connection passage 64 connected to the suction side connection portion 43c. Between the cylindrical discharge side connection portion 43d having the discharge port 43b of the high pressure side compressor chamber 43 and the suction port 63a of the high pressure side connection passage 63 connected to the discharge side connection portion 43d. A rubber sheet 48 that is an elastic member is provided. Specifically, a rubber sheet 48 formed in a cylindrical shape is attached to each outer peripheral surface of the suction side connection portion 43c and the discharge side connection portion 43d. In this state, the suction side connection portion 43c and the discharge side connection portion 43d are press-fitted and attached to the discharge port 64a of the communication connection passage 64 and the suction port 63a of the high pressure side connection passage 63, respectively. Thereby, the high-pressure supercharger 40 is fixed to the intake side connection device 7.

  The low-pressure side compressor chamber 53 is fixed to the connection main body portion 70a by a bolt B that is a fixing member. Specifically, the low pressure side compressor chamber 53 is provided with an attachment portion 53c that directly contacts the low pressure supercharger surface 7b of the connection main body portion 70a. The attachment portion 53c is provided with a screw hole 53d for fixing the bolt B. Further, the connection main body 70a is provided with an insertion portion 78 which is a through-hole penetrating from the high pressure supercharger surface 7c toward the low pressure supercharger surface 7b in the engine length direction X2 into which the bolt B is inserted. Then, the bolt B is inserted into the insertion portion 78 from the high-pressure supercharger surface 7c toward the low-pressure supercharger surface 7b, and then fixed with the screw hole 53d of the attachment portion 53c. That is, the bolt head B1 of the bolt B is arranged on the high-pressure supercharger surface 7c side.

  As shown in FIG. 4, the connection main body portion 70 a of the intake side connection device 7 is connected to the blow-by gas connection passage 65 connected to the communication tube 5 a of the blow-by gas reduction device 5 and the communication tube 9 a of the exhaust gas recirculation device 9. An exhaust gas recirculation connection passage 66 is provided. Each of the blow-by gas connection passage 65 and the exhaust gas recirculation connection passage 66 is connected to the inlet-side connection passage 61.

  The blow-by gas connection passage 65 is provided with an inlet 65a on the inlet surface 7a. The suction port 65a is provided on the side where the engine body 10 in the engine depth direction X3 is disposed (hereinafter referred to as “engine body side”) relative to the suction port 61a of the inlet side connection passage 61 provided on the same inlet surface 7a. ing. The blow-by gas connection passage 65 includes a first connection passage 65b extending downward from the inlet surface 7a in the engine height direction X1 and a second connection passage 65c bent from the first connection passage 65b toward the inlet-side connection passage 61. It is provided as a configured through hole.

  The exhaust gas recirculation connection passage 66 is formed on a surface (hereinafter referred to as “engine main body separation surface”) opposite to the engine main body direction in the engine depth direction X3 (hereinafter referred to as “engine main body separation surface 7e”) on the surface of the connection main body portion 70a. Is provided. The exhaust gas recirculation connection passage 66 is provided as a through hole extending from the engine body separating surface 7e toward the inlet side connection passage 61 along the engine depth direction X3.

  Further, the blow-by gas connection passage 65 and the exhaust gas recirculation connection passage 66 are provided in such a manner that they are located on the opposite sides of the inlet-side connection passage 61 in the engine depth direction X3. Specifically, the blow-by gas connection passage 65 is provided in the engine body direction in the engine depth direction X3 with respect to the inlet side connection passage 61, and the exhaust gas recirculation connection passage 66 is in the engine depth direction with respect to the inlet side connection passage 61. It is provided in the X3 engine body separation direction.

  As shown in FIG. 5, the relationship between the channel cross-sectional areas of the passages is as follows. That is, the inlet-side connection passage 61, the low-pressure side connection passage 62, and the communication connection passage 64 are formed with the same flow-path cross-sectional area, and among the connection passages formed in the connection body 70a, the flow-path cross-sectional area Is formed to be large. The blow-by gas connection passage 65 and the exhaust gas recirculation connection passage 66 are formed with the same flow path cross-sectional area, and the flow path cross-sectional area is formed to be the smallest among the connection passages formed in the connection body 70a. Yes. The high-pressure side connection passage 63 has a smaller channel cross-sectional area than the inlet-side connection passage 61, the low-pressure side connection passage 62, and the communication connection passage 64, and the flow path is smaller than the blow-by gas connection passage 65 and the exhaust gas recirculation connection passage 66. The cross-sectional area is formed to be large.

  As shown in FIG. 6, the connection main body 70a is provided with a water jacket 79. The water jacket portion 79 includes a first jacket portion 79a to a third jacket portion 79c. Specifically, as shown in FIG. 6A, the first jacket portion 79 a is provided between the inlet side connection passage 61 and the communication connection passage 64. The second jacket portion 79 b is provided between the communication connection passage 64 and the high-pressure side connection passage 63. As shown in FIG. 6B, the third jacket portion 79 c is provided between the inlet side connection passage 61 and the blowby gas connection passage 65. By these first jacket portion 79a and second jacket portion 79b, the temperature of the intake air flowing through the inlet side connection passage 61, the communication connection passage 64, and the high pressure side connection passage 63 can be lowered. On the other hand, when the outside air is in a low temperature state, the blow-by gas connection passage 65 is warmed by the third jacket portion 79c to suppress freezing in the blow-by gas connection passage 65.

With reference to FIG. 7, the exhaust-side connection device 8 of the multistage supercharging device 4 will be described.
As shown in FIG. 7, the exhaust side connection device 8 is provided in a manner that is integral with the exhaust manifold 32. In particular, a communication exhaust unit 90 is provided in the housing body 32 a of the exhaust manifold 32.

  As shown in FIG. 7A, the housing main body portion 32a is provided with a plurality of exhaust gas introduction portions 32d for introducing exhaust gas discharged from the cylinders of the engine main body 10 (see FIG. 1). A merging portion 32e where the exhaust in the exhaust introduction portion 32d merges is provided on the exhaust downstream side of the exhaust introduction portion 32d. The junction 32e includes a first high-pressure side connection portion 32f connected to the suction port of the high-pressure side turbine chamber 42 of the high-pressure supercharger 40 and a first connection point connected to the suction port of the low-pressure side turbine chamber 52 of the low-pressure supercharger 50. 1 low voltage side connection part 32g is provided, respectively. An exhaust side switching valve 85 is provided in the first low pressure side connection portion 32g.

  The exhaust side switching valve 85 is in an exhaust state in which exhaust gas from the merging portion 32e of the exhaust manifold 32 is supplied to the low pressure supercharger 50 via the first low pressure side connecting portion 32g, and exhaust gas in the merging portion 32e is supplied to the first high pressure. The state of the exhaust supplied to the high-pressure supercharger 40 via the side connection portion 32f is switched.

  The communicating exhaust part 90 is provided on the engine body separating side in the engine depth direction X3 with respect to the merging part 32e. The passage length in the engine length direction X2 of the communication exhaust portion 90 is the same as the passage length in the engine length direction X2 of the merging portion 32e. A partition wall 32h that divides the exhaust manifold 90 and the junction 32e is provided over the exhaust manifold 32 in the engine length direction X2.

  Further, the communication exhaust part 90 includes a second high-pressure side connection part 91 connected to the discharge port of the high-pressure side turbine chamber 42 and a second low-pressure side connection part 92 connected to the discharge port of the low-pressure side turbine chamber 52. Is provided.

  The communication exhaust section 90 is provided with an exhaust passage connection section 93 that constitutes the exhaust pipe 31 of the exhaust passage 33 on the exhaust downstream side (that is, the exhaust purification apparatus 34 side) of the multistage turbocharger 4. The exhaust connection passage connecting portion 93 and the communication exhaust portion 90 are mutually connected in an opening 93a provided between the second high pressure side connection portion 91 and the second low pressure side connection portion 92 in the engine length direction X2. It is connected.

Here, the relationship between the exhaust side supercharging passage 80 (see FIG. 1) and each connection portion provided in the exhaust side connection device 8 is as follows.
That is, the inlet-side exhaust passage 81 is configured by a passage from an inlet connected to the merging portion 32e in the first high-pressure side connecting portion 32f to an outlet connected to the suction port of the high-pressure side turbine chamber 42. The low-pressure side exhaust passage 83 is configured by a passage from an inlet connected to the junction 32e in the first low-pressure side connection portion 32g to an outlet connected to the suction port of the low-pressure side turbine chamber 52. The communication exhaust passage 84 includes a passage from the inlet of the second high-pressure side connecting portion 91 to the opening 93 a of the exhaust passage connecting portion 93 and an inlet passage of the second low-pressure side connecting portion 92 in the communication exhaust portion 90. It is comprised by the channel | path to the opening part 93a of the connection part 93. FIG.

  As shown in FIG. 7B, the first low-pressure side connection portion 32g is provided above the junction height 32e in the engine height direction X1, and the second low-pressure side connection portion 92 is the engine height of the communication exhaust portion 90. It is provided above the direction X1. Although not shown, the first high-pressure side connection portion 32f and the second high-pressure side connection portion 91 are also provided above the merge portion 32e in the engine height direction X1 and above the communication exhaust portion 90 in the engine height direction X1, respectively. It has been. On the other hand, the exhaust passage connection portion 93 is provided below the communication exhaust portion 90 in the engine height direction X1.

  The multi-stage supercharger 4 configured as described above has an assembly formed on the exhaust manifold 32 that is attached to the high pressure supercharger 40, the low pressure supercharger 50, and the connection main body portion 70a of the intake side connection device 7. Assembled by.

  Specifically, the rubber sheet 48 is attached to the high-pressure supercharger 40 and attached to the connection main body 70a. Next, the attachment portion 53c of the low-pressure supercharger 50 and the connection main body portion 70a are fixed to each other with the bolt B in a state where they are in contact with each other. Thus, the assembly is formed.

  Next, in this assembly, the supercharger side mounting portion 41c of the high pressure supercharger 40 and the supercharger side mounting portion 51c of the low pressure supercharger 50 are in direct contact with the manifold side mounting portion 32c of the exhaust manifold 32. And fix them together with bolts. As described above, the multistage supercharging device 4 can be assembled in a state in which the connection pipe that has been conventionally required is omitted.

With reference to FIG.8 and FIG.9, the state of the intake and exhaust of the multistage supercharger 4 accompanying an engine load is demonstrated.
As shown in FIG. 8, when the engine load is low, the exhaust side switching valve 85 and the intake side switching valve 75 are each maintained in a closed state. As a result, exhaust and intake air flow in the multistage turbocharger 4 as follows.

  As shown in FIG. 8 (b), the exhaust gas supplied from the exhaust gas introduction part 32d to the merging part 32e enters the high pressure side turbine chamber 42 via the first high pressure side connection part 32f as shown by the arrow in the figure. Supplied. The exhaust from the high-pressure side turbine chamber 42 is supplied to the communication exhaust part 90 via the second high-pressure side connection part 91. Then, the exhaust from the communication exhaust section 90 flows out to the exhaust downstream side (that is, the exhaust purification apparatus) of the multistage supercharger 4 through the opening 93a and the exhaust passage connection section 93.

  As shown in FIG. 8A, the intake air from the intake upstream side (that is, the air cleaner 24 side) of the multistage supercharger 4 is supplied to the inlet pipe 76 and the inlet side connection passage 61 as shown by the arrows in the figure. To the low-pressure side compressor chamber 53. The intake air discharged from the low pressure side compressor chamber 53 is supplied to the high pressure side compressor chamber 43 through the low pressure side connection passage 62 and the communication connection passage 64. The intake air discharged from the high-pressure side compressor chamber 43 is supplied to the intercooler 25 via the high-pressure side connection passage 63 and the outlet pipe 77.

  When the engine load is low, exhaust gas is not supplied to the low-pressure supercharger 50, so that the turbine wheel 55 of the low-pressure supercharger 50 is stopped. On the other hand, since the exhaust gas is supplied to the high-pressure supercharger 40, it is driven by the exhaust gas that passes through the turbine wheel 45. In particular, since the high-pressure supercharger 40 has a small physique, the turbine wheel 45 is driven even when the flow rate of exhaust at low load is small. Therefore, when the engine load is low, only the turbine wheel 45 of the high-pressure supercharger 40 is driven. As a result, the compressor wheel 46 connected by the rotor shaft 47 is driven as the turbine wheel 45 is driven, so that supercharging is performed only by the high-pressure supercharger 40.

  As shown in FIG. 9, when the engine load is a medium load and a high load, the exhaust side switching valve 85 and the intake side switching valve 75 are each maintained in a closed state. As a result, exhaust and intake air flow in the multistage supercharging device 4 as follows.

  As shown in FIG. 9B, the exhaust gas supplied from the exhaust gas introduction part 32d to the merging part 32e is supplied to the low pressure side turbine chamber 52 via the first high pressure side connection part 32f as shown by the arrow in the figure. Is done. Exhaust gas discharged from the low-pressure side turbine chamber 52 flows into the exhaust passage 33 on the exhaust downstream side (that is, on the exhaust purification device 34 side) of the multistage supercharger 4 via the second high-pressure side connection portion 91.

  As shown in FIG. 9A, the intake air on the upstream side of the multistage turbocharger 4 (that is, the air cleaner 24 side) is fed through the inlet pipe 76 and the inlet side connection passage 61 as shown by the arrows in the figure. To the low pressure side compressor chamber 53. The intake air discharged from the low pressure side compressor chamber 53 is supplied to the intercooler 25 via the low pressure side connection passage 62 and the outlet pipe 77.

  When the engine load is a medium load and a high load, exhaust gas is supplied to the low-pressure supercharger 50, so that the turbine wheel 55 of the low-pressure supercharger 50 is driven. Therefore, when the engine load is medium load and high load, supercharging by the low pressure supercharger 50 is performed. As described above, the engine 1 can obtain the supercharging characteristics of the multistage supercharging device 4 according to the engine load state.

According to the engine 1 of the present embodiment, the following effects can be achieved.
(1) In the present embodiment, in the intake side connection device 7, the connection main body portion 70a is formed of a block body, and the inlet side connection passage 61 and the high-pressure side connection passage 63 are provided in the connection main body portion 70a. Yes. Accordingly, since the inlet side connection passage 61 and the high pressure side connection passage 63 are integrally formed by the intake side connection device 7, the inlet side connection passage 61 and the high pressure side connection passage 63 are provided as separate pipes. Compared to the above, the arrangement structure of the pipes connected to the high-pressure supercharger 40 and the low-pressure supercharger 50 can be simplified.

  Particularly, in the intake side connection device of the conventional multistage supercharging device, connection pipes for forming the inlet side intake passage, the outlet side intake passage, the low pressure side intake passage, and the communication intake passage are required. For this reason, the number of parts of the connection pipes increases, and the work of assembling the connection pipes to the high-pressure supercharger and the low-pressure supercharger so as not to interfere with each other is complicated.

  In that respect, in this embodiment, in order to obtain the intake side connection device 7 that is a single assembly in which the inlet side intake passage 71 to the communication intake passage 74 are formed, the number of parts of the connection pipe is increased and the number of connection pipes is increased. Both the complexity of connection can be suppressed.

  (2) In the present embodiment, the connection passage 64 for communication is provided in the connection body 70a. Accordingly, the communication connection passage 64 is formed integrally with the inlet side connection passage 61 and the high pressure side connection passage 63 by the intake side connection device 7, so that the communication connection passage 64, the inlet side connection passage 61, and the high pressure side connection passage are formed. 63 is simplified as well as the arrangement structure of the pipes connected to the high-pressure supercharger 40 and the low-pressure supercharger 50, and the number of the same pipes can be reduced as compared with the case where 63 is provided as separate pipes. become able to.

  (3) In the present embodiment, the low-pressure side connection passage 62 is provided in the connection main body 70a. As a result, the low-pressure side connection passage 62 is formed integrally with the inlet-side connection passage 61 and the high-pressure side connection passage 63 by the intake-side connection device 7, so that the low-pressure side connection passage 62, the inlet-side connection passage 61, and the high-pressure side connection passage are formed. 63 is simplified as well as the arrangement structure of the pipes connected to the high-pressure supercharger 40 and the low-pressure supercharger 50, and the number of the same pipes can be reduced as compared with the case where 63 is provided as separate pipes. become able to. Furthermore, since the low pressure side intake passage 73 and the communication intake passage 74 are integrally formed by the intake side connection device 7, complicated piping such as three-way piping can be omitted.

  (4) In this embodiment, the low pressure side connection passage 62 is provided with an intake side switching valve 75. According to this configuration, it is possible to suppress an increase in the size of the intake side connection device 7 as compared with the case where the intake side switching valve 75 is provided in a passage provided outside the low pressure side connection passage 62. .

  (5) In the present embodiment, the suction port 61a of the inlet side connection passage 61 is provided on a different surface from the low pressure supercharger surface 7b of the connection main body 70a. Therefore, it is possible to easily set the layout of the pipe that avoids the interference between the pipe connected to the suction port 61a (the intake pipe 21 on the air cleaner 24 side) and the low-pressure supercharger 50.

  In addition, since the suction port 61a is provided on a surface different from the high-pressure supercharger surface 7c of the connection main body 70a, the layout of the piping that avoids interference between the piping and the high-pressure supercharger 40 is easily set. Will be able to.

  In particular, since the low-pressure supercharger 50 is larger in size than the high-pressure supercharger 40, when the suction port 61a is provided on the surface where the low-pressure supercharger 50 is disposed in the intake side connection device 7, the above-described piping And the low-pressure supercharger 50 are likely to interfere with each other. In order to avoid interference between the pipe and the low-pressure supercharger 50, the pipe structure in the vicinity of the low-pressure supercharger 50 in the pipe may have to be complicatedly bent. In that respect, in this embodiment, since the inlet 61a is provided in the inlet surface 7a different from the low pressure supercharger surface 7b, it can suppress that said piping is made into a complicated piping structure.

  (6) In the present embodiment, the discharge port 63b of the high-pressure side connection passage 63 is provided on a different surface from the low-pressure supercharger surface 7b of the connection main body 70a. Therefore, it is possible to easily set the layout of the pipe that avoids interference between the pipe (intercooler side intake pipe 21) connected to the discharge port 63b and the low-pressure supercharger 50. In addition, since the discharge port 63b is provided on a surface different from the high-pressure supercharger surface 7c of the connection main body 70a, a layout of the pipe that avoids interference between the pipe and the high-pressure supercharger 40 is easily set. Will be able to.

  (7) In the present embodiment, when the intake air in the high pressure side connection passage 63 and the intake air in the low pressure side connection passage 62 are merged, the discharge port 63b of the high pressure side connection passage 63 and the discharge port of the low pressure side connection passage 62 In the structure in which 62b is provided on different surfaces of the intake side connection device 7, it is necessary to provide a structure in which these pipes are joined together after the pipes are provided separately. In this regard, in the present embodiment, the discharge port 63b of the high-pressure side connection passage 63 and the discharge port 62b of the low-pressure side connection passage 62 are provided on the outlet surface 7d, which is the same surface in the intake-side connection device 7, and the common piping Therefore, the separate pipes can be omitted. Therefore, the number of pipes connected to the high pressure supercharger 40 and the low pressure supercharger 50 can be reduced.

  (8) In the present embodiment, the connection main body portion 70 a is provided with a blow-by gas connection passage 65 that connects to the communication pipe 5 a of the blow-by gas reduction device 5. Therefore, since the inlet side connection passage 61, the high pressure side connection passage 63, and the blowby gas connection passage 65 are integrally formed by the connection main body 70a, the blowby gas connection passage 65, the inlet side connection passage 61, and the high pressure side connection passage 63 are formed. Compared with the case where these are provided as separate pipes, the arrangement structure of the pipes connected to the high-pressure supercharger 40 and the low-pressure supercharger 50 can be simplified.

  (9) In the present embodiment, the blow-by gas connection passage 65 and the inlet-side connection passage 61 are connected to each other in the connection main body portion 70a. Therefore, compared to a structure in which the blow-by gas connection passage 65 and the inlet side connection passage 61 are connected outside the connection main body portion 70a, complicated piping such as a three-pronged piping can be omitted.

  (10) The suction port 65a of the blow-by gas connection passage 65 is formed on a surface different from the low-pressure supercharger surface 7b of the connection main body 70a. Therefore, the layout of the communication pipe 5a that suppresses interference between the communication pipe 5a connected to the suction port 65a and the low-pressure supercharger 50 can be easily set.

  The suction port 65a is formed on a surface different from the high-pressure supercharger surface 7c of the connection main body 70a. Therefore, the layout of the communication pipe 5a that suppresses interference between the communication pipe 5a connected to the suction port 65a and the high-pressure supercharger 40 can be easily set.

  (11) In the present embodiment, the connection main body portion 70a is provided with the exhaust gas recirculation connection passage 66 that is connected to the communication pipe 9a of the exhaust gas recirculation device 9. Therefore, since the inlet-side connection passage 61, the high-pressure side connection passage 63, and the exhaust gas recirculation connection passage 66 are integrally formed by the connection main body portion 70a, the exhaust gas recirculation connection passage 66, the inlet-side connection passage 61, and the high-pressure side connection passage 63 are formed. Compared with the case where these are provided as separate pipes, the arrangement structure of the pipes connected to the high-pressure supercharger 40 and the low-pressure supercharger 50 can be simplified.

  (12) In the present embodiment, the exhaust gas recirculation connection passage 66 and the inlet side connection passage 61 are connected to each other in the connection main body portion 70a. Therefore, compared to a structure in which the exhaust gas recirculation connection passage 66 and the inlet side connection passage 61 are connected outside the connection main body portion 70a, a complicated pipe such as a three-pronged pipe can be omitted.

  (13) In the present embodiment, the exhaust gas recirculation connection passage 66 and the inlet side connection passage 61 are connected to each other in the connection main body portion 70a. Therefore, compared with the structure in which the exhaust gas recirculation connection passage 66 and the inlet side connection passage 61 are connected outside the connection main body 70a, it is possible to suppress an increase in the size of the multistage supercharger 4 as a whole. become able to.

  (14) The suction port 66a of the exhaust gas recirculation connection passage 66 is formed on a surface different from the low-pressure supercharger surface 7b of the connection main body 70a. Therefore, the layout of the communication pipe 9a that suppresses interference between the communication pipe 9a connected to the suction port 66a and the low-pressure supercharger 50 can be easily set.

  The suction port 66a is formed on a surface different from the high pressure supercharger surface 7c of the connection main body 70a. Therefore, the layout of the communication pipe 9a that suppresses interference between the communication pipe 9a connected to the suction port 66a and the high-pressure supercharger 40 can be easily set.

  (15) Further, the suction port 66a of the exhaust gas recirculation connection passage 66 is formed on a surface different from the inlet surface 7a where the suction port 61a of the inlet side connection passage 61 is provided. Therefore, the layout of the connection pipe that suppresses interference with the connection pipe (that is, the intake pipe 21 that connects the air cleaner 24 and the intake side connection device 7) in which the communication pipe 9a is connected to the inlet side connection passage 61 is easily set. Will be able to.

  (16) Further, the suction port 66a of the exhaust gas recirculation connection passage 66 is formed on a surface different from the outlet surface 7d provided with the discharge port 63b of the high pressure side connection passage 63. Therefore, the layout of the connection pipe that suppresses interference with the connection pipe (that is, the intake pipe 21 that connects the intake-side connection device 7 and the intercooler 25) where the communication pipe 9a is connected to the high-pressure side connection passage 63 is facilitated. Can be set.

  (17) In the present embodiment, the suction port 43a of the high-pressure side compressor chamber 43 and the suction port 53a of the low-pressure side compressor chamber 53 are opposed to each other in the engine length direction X2. The intake side connection device 7 is provided between the suction port 43a and the suction port 53a in the engine length direction X2. Therefore, compared with the arrangement structure of the high-pressure supercharger 40 and the low-pressure supercharger 50 in which the high-pressure side turbine chamber 42 and the low-pressure side turbine chamber 52 face each other, the intake-side connection device 7 as a whole is large-sized. Can be suppressed.

  Particularly, the high pressure side compressor chamber 43 and the low pressure side compressor chamber 53 are made to face each other, and a plurality of pipes connected to the high pressure side compressor chamber 43 and the low pressure side compressor chamber 53 are arranged therebetween. Then, it is difficult to arrange these pipes without interfering with each other. In that respect, it is possible to avoid the arrangement of the piping between the high-pressure side compressor chamber 43 and the low-pressure side compressor chamber 53 by using the block body intake side connection device 7 instead of these piping. Such a problem of piping interference can be prevented.

  (18) In the present embodiment, the high pressure supercharger 40 and the low pressure supercharger 50 are in direct contact with the connection main body portion 70a. That is, the high-pressure supercharger 40 and the low-pressure supercharger 50 are directly attached to the connection main body 70a. Therefore, the connection piping for connecting the intake side connecting device 7 to the high pressure supercharger 40 and the low pressure supercharger 50 can be omitted, and the overall size of the multistage supercharger 4 is suppressed and the multistage type is suppressed. It becomes possible to achieve both reduction in the number of parts of the entire supercharging device 4.

  Moreover, the intake side supercharging passage 70 for connecting the high pressure supercharger 40 and the low pressure supercharger 50 can be formed only by directly attaching the high pressure supercharger 40 and the low pressure supercharger 50 to the connection main body 70a. Therefore, the assembling property of the multistage supercharging device 4 can be improved.

  (19) In the present embodiment, the compressor chamber 53 of the low-pressure supercharger 50 is provided with an attachment portion 53c that contacts the low-pressure supercharger surface 7b of the connection main body 70a, and the high-pressure supercharger of the connection main body 70a. The bolt B is inserted from the surface 7c, and the bolt B and the attachment portion 53c are screwed together. Therefore, the bolt head B1 of the bolt B comes to be positioned on the high pressure supercharger surface 7c side. Here, since the space other than the high-pressure supercharger 40 on the high-pressure supercharger surface 7c is larger than the space other than the low-pressure supercharger 50 on the low-pressure supercharger surface 7b, the bolt head B1 is low-pressure supercharger surface 7b. As compared with the structure located at, the size of the intake side connection device 7 can be suppressed.

  (20) In the present embodiment, the rubber sheet 48 is provided between the suction side connection portion 43c and the discharge side connection portion 43d of the compressor chamber 43 of the high pressure supercharger 40 and the communication connection passage 64 and the high pressure side connection passage 63. Intervene. Therefore, even if the high-pressure supercharger 40 and the low-pressure supercharger 50 are thermally expanded as the temperature rises, it is possible to absorb the deviation due to the thermal expansion due to the elastic deformation of the rubber sheet 48.

  (21) In the present embodiment, the exhaust manifold 32 is provided with a communication exhaust part 90. That is, the exhaust manifold 32 is integrally provided with a communication exhaust passage 84. Therefore, as compared with a structure in which the exhaust manifold 32 and the communication exhaust part 90 are provided separately, it is possible to suppress an increase in the size of the multistage supercharger 4 as a whole.

  In particular, the conventional multi-stage supercharging device is not only complicated in connection of the connection pipe in the intake side connection device, but also in the exhaust side connection device, similarly for the inlet side exhaust passage, high pressure side exhaust passage, low pressure side exhaust passage and communication Each of the connecting pipes for forming the exhaust passage was necessary. For this reason, the number of parts of the connecting pipe increases, and the work of assembling the connecting pipe to the high-pressure supercharger and the low-pressure supercharger so as not to interfere with each other is complicated.

  In this respect, in the present embodiment, the exhaust-side connecting device 8 has the communication exhaust passage 84 formed integrally with the exhaust manifold 32, thereby suppressing the increase in the number of parts of the connecting pipe and the complexity of connecting each connecting pipe. Will be able to.

  (22) In the present embodiment, the communication exhaust part 90 and the merging part 32e are adjacent to each other via the partition wall 32h. Therefore, it is possible to suppress an increase in size as an assembly of the multistage supercharging device 4 and the exhaust manifold 32 as compared with a structure in which the communication exhaust part 90 and the joining part 32e are separated from each other.

  (23) In the present embodiment, the communication exhaust section 90 is provided from a position facing the high pressure side turbine chamber 42 to a position facing the low pressure side turbine chamber 52. Accordingly, the connection passage connecting the high-pressure turbine chamber 42 and the communication exhaust section 90 and the connection passage connecting the low-pressure turbine chamber 52 and the communication exhaust section 90 can be shortened.

  (24) In the present embodiment, the first high pressure side connection portion 32f provided in the junction 32e and the suction port of the high pressure side turbine chamber 42, the second high pressure side connection portion 91 provided in the communication exhaust portion 90, and The discharge ports of the high-pressure turbine chamber 42 are directly connected to each other. As a result, it is possible to omit the connecting pipe that connects the exhaust manifold 32 and the high-pressure supercharger 40, and it is possible to suppress an increase in size of the multistage supercharger 4 as a whole. .

  Similarly, the suction port of the first low-pressure side connection portion 32g and the low-pressure side turbine chamber 52 provided in the junction portion 32e, and the second low-pressure side connection portion 92 and high-pressure side turbine chamber 42 provided in the communication exhaust portion 90. The discharge ports are directly connected to each other. Thereby, it becomes possible to omit the connection piping connecting the exhaust manifold 32 and the low-pressure supercharger 50, and the increase in the size of the multistage supercharger 4 as a whole device can be suppressed. .

  As a result, the exhaust-side supercharging passage 80 can be configured simply by directly attaching the high-pressure supercharger 40 and the low-pressure supercharger 50 to the exhaust manifold 32, so that the assembly of the multistage supercharging device 4 is improved. To be able to.

  (25) In the present embodiment, the opening 93a of the exhaust passage connecting portion 93 is provided between the second high pressure side connecting portion 91 and the second low pressure side connecting portion 92 in the engine length direction X2. Therefore, compared with the structure in which the exhaust passage connection portion is provided on one side in the engine length direction X2 from the second high pressure side connection portion and the second low pressure side connection portion, the space for providing the exhaust passage connection portion 93 is reduced. It can be omitted. As a result, the multistage supercharging device 4 can be downsized as a whole device.

  (26) In this embodiment, an assembly in which the high-pressure supercharger 40 and the low-pressure supercharger 50 are attached to the connection main body portion 70a of the intake side connection device 7 is manufactured, and then attached to the exhaust manifold 32. The feeding device 4 is manufactured. Therefore, both the assembling property of the multistage supercharging device 4 and the assembling property to the exhaust manifold 32 can be improved as compared with a structure using a plurality of conventional connecting pipes.

(Other embodiments)
The specific configuration of the multistage supercharging device of the present invention and the internal combustion engine including the same is not limited to the configuration illustrated in the above embodiment, and may be modified as follows, for example. The following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.

  In the present embodiment, the exhaust side switching valve 85 is provided in the first low pressure side connection portion 32g (see FIG. 7A), but the position where the exhaust side switching valve 85 is provided is limited to this. Never happen. For example, a connection pipe may be provided between the first low pressure side connection portion 32g and the low pressure side turbine chamber 52, and the exhaust side switching valve 85 may be provided in the connection pipe.

  In the present embodiment, the merging portion 32e of the exhaust manifold 32 is connected to both the low pressure side turbine chamber 52 and the high pressure side turbine chamber 42 (see FIG. 7A), but the merging portion 32e and the low pressure side The connection structure between the turbine chamber 52 and the high-pressure side turbine chamber 42 is not limited to this. For example, by providing a connection pipe branched from the first high-pressure side connection portion 32f, the first high-pressure side connection portion 32f and the low-pressure side turbine chamber 52 can be connected.

  In the present embodiment, the communication exhaust part 90 is provided as a part of the exhaust manifold 32 (see FIG. 7A). However, the exhaust part 90 for communication formed separately from the exhaust manifold 32 is provided. It can also be set as the structure attached to the housing main-body part 32a. Further, the housing main body 32a and the communication exhaust 90 can be separated from each other.

  In the present embodiment, the connection main body portion 70a, the high-pressure supercharger 40, and the low-pressure supercharger 50 are in direct contact with each other (see FIG. 3). Another member may intervene between the supercharger 50.

  In the present embodiment, the connection main body portion 70a has a structure in which the suction port 66a of the exhaust gas recirculation connection passage 66 is provided on a different surface from the high-pressure supercharger surface 7c and the low-pressure supercharger surface 7b (see FIG. 4). However, the surface on which the suction port 66a is provided can be structured to be the high-pressure supercharger surface 7c or the low-pressure supercharger surface 7b.

  In the present embodiment, the connection main body portion 70a has a structure in which the suction port 65a of the blow-by gas connection passage 65 is provided on a different surface from the high-pressure supercharger surface 7c and the low-pressure supercharger surface 7b (see FIG. 4). However, the surface on which the suction port 65a is provided may be a structure that becomes the high-pressure supercharger surface 7c or the low-pressure supercharger surface 7b.

  In the present embodiment, the connection main body portion 70a has a structure in which the discharge port 63b of the high-pressure side connection passage 63 is provided on a different surface from the high-pressure supercharger surface 7c and the low-pressure supercharger surface 7b (see FIG. 4). However, the surface on which the discharge port 63b is provided may be structured to be the high pressure supercharger surface 7c or the low pressure supercharger surface 7b.

  In the present embodiment, the connection main body portion 70a has a structure in which the discharge port 62b of the low-pressure side connection passage 62 is provided on a surface different from the high-pressure supercharger surface 7c and the low-pressure supercharger surface 7b (see FIG. 4). However, the surface on which the discharge port 62b is provided may be structured to be the high pressure supercharger surface 7c or the low pressure supercharger surface 7b.

  In the present embodiment, the connection main body portion 70a has a structure in which the suction port 61a of the inlet side connection passage 61 is provided on a different surface from the high pressure supercharger surface 7c and the low pressure supercharger surface 7b (see FIG. 4). However, the surface on which the suction port 61a is provided may be structured to be the high pressure supercharger surface 7c or the low pressure supercharger surface 7b.

  In the present embodiment, in the connection main body portion 70a, the suction port 61a of the inlet side connection passage 61 and the suction port 65a of the blow-by gas connection passage 65 are provided on the same inlet surface 7a (see FIG. 4). The suction port 61a and the suction port 65a may be provided on different surfaces.

  In the present embodiment, in the connection main body 70a, the discharge port 63b of the high-pressure side connection passage 63 and the discharge port 62b of the low-pressure side connection passage 62 are provided on the same outlet surface 7d (see FIG. 4). The discharge port 63b and the discharge port 62b can be provided on different surfaces.

  In the present embodiment, the exhaust gas recirculation connection passage 66 is connected to the inlet side connection passage 61 (see FIG. 4), but the communication pipe 9a is connected to the intake pipe 21 other than the connection main body portion 70a. It can be.

  In the present embodiment, the blow-by gas connection passage 65 is connected to the inlet-side connection passage 61 (see FIG. 4), but the communication pipe 5a is connected to the intake pipe 21 other than the connection main body portion 70a. It can be.

  In the present embodiment, the low pressure side intake passage 73 is configured by providing the low pressure side connection passage 62 in the connection main body portion 70a (see FIG. 3), but the low pressure side connection is made outside the connection main body portion 70a. It is also possible to adopt a structure in which the low-pressure side intake passage 73 is configured using a connection pipe that becomes the passage 62.

  In the present embodiment, the intake side switching valve 75 is provided in the low pressure side connection passage 62 of the connection main body 70a (see FIG. 3), but the intake side switching is performed on the connection pipe outside the low pressure side connection passage 62. A structure in which the valve 75 is provided may be employed.

  In the present embodiment, the connection main body 70a is provided with the communication connection passage 64 so that the communication intake passage 74 is provided (see FIG. 3), but the connection main body 70a is connected to the outside of the connection main body 70a. By using a connection pipe as the passage 64, the communication intake passage 74 can be configured.

  -In this embodiment, although the physique of the high-pressure supercharger 40 was formed smaller than the physique of the low-pressure supercharger 50, the physiques of the high-pressure supercharger 40 and the low-pressure supercharger 50 may have the same configuration. it can. Moreover, although it was set as the multistage supercharger 4, it can also be set as the structure of the supercharger using two or more same superchargers.

  In this embodiment, the suction port 43a of the high-pressure side compressor chamber 43 and the suction port 53a of the low-pressure side compressor chamber 53 face each other in the engine length direction X2, and the connection main body portion 70a of the suction-side connection device 7 is between them. Although the structure is arranged (see FIG. 3), the arrangement structure of the connection main body 70a is not limited to this.

  In the present embodiment, the high-pressure side compressor chamber 43 and the low-pressure side compressor chamber 53 are configured to face each other in the engine length direction X2 (see FIG. 3). The arrangement of the side compressor chamber 53 is not limited to this. For example, as shown in FIG. 10B, the suction port 43a of the high-pressure side compressor chamber 43 and the suction port 53a of the low-pressure side compressor chamber 53 may be opened in parallel to each other. This also applies to the configuration of a supercharging device that uses a plurality of identical superchargers, as shown in FIG.

  For example, as shown to Fig.10 (a), it can also be set as the structure where the connection main-body part 70a is arrange | positioned at the one side of the high voltage | pressure supercharger 40 and the low voltage | pressure supercharger 50. FIG. 10B, the suction port 43a of the high-pressure side compressor chamber 43 of the high-pressure supercharger 40 and the suction port 53a of the low-pressure side compressor chamber 53 of the low-pressure supercharger 50 are parallel to each other. The connection main body portion 70 a can be disposed between the high-pressure side compressor chamber 43 and the low-pressure side compressor chamber 53.

  Similarly, as shown in FIG. 11 (a), also in a supercharger using a plurality of the same superchargers, the connection main body 70a is arranged on one side of the first supercharger 40A and the second supercharger 50A. It can also be set as a structure. Further, as shown in FIG. 11B, the suction port 43B of the first compressor chamber 43A of the first supercharger 40A and the suction port 53B of the second compressor chamber 53A of the second supercharger 50A are parallel to each other. In addition, the connection main body 70a can be disposed between the first compressor chamber 43A and the second compressor chamber 53A.

  -In this embodiment, although the rectangular parallelepiped was used as the connection main-body part 70a, the shape of the connection main-body part 70a is not limited to this. What is necessary is just a block body which has a some surface. The shape of the connection main body 70a can be, for example, a cube.

  In the present embodiment, the connection body 70a is provided as a block member as a single member, but the configuration of the connection body 70a is not limited to this. For example, a plurality of block bodies can be provided as the connection main body portion 70a by joining them together.

  In the present embodiment, the intake side connection device 7 includes the connection main body 70a, the inlet pipe 76, and the outlet pipe 77, but the configuration of the intake side connection device 7 is not limited thereto. For example, the intake side connection device 7 may be configured such that at least one of the inlet pipe 76 and the outlet pipe 77 is omitted.

  In the above embodiment, a diesel engine is used as the internal combustion engine. However, for example, a gasoline engine may be used as the internal combustion engine.

  DESCRIPTION OF SYMBOLS 1 ... Engine, 5 ... Blow-by gas reduction device, 5a ... Communication pipe (communication path), 6 ... Connection device, 7 ... Intake side connection device, 7a ... Inlet surface, 7b ... Low pressure supercharger surface, 7c ... High pressure supercharge Machine surface, 7d ... exit surface, 7e ... engine body separating surface, 8 ... exhaust side connection device, 9 ... exhaust recirculation device, 9a ... communication pipe (exhaust recirculation passage), 9b ... EGR cooler, 9c ... EGR valve, 10 ... Engine body 11 ... Combustion chamber, 20 ... Intake device, 21 ... Intake pipe, 22 ... Intake manifold, 23 ... Intake passage, 24 ... Air cleaner, 25 ... Intercooler, 26 ... Diesel throttle, 30 ... Exhaust device, 31 ... Exhaust 32, exhaust manifold, 32a ... housing body, 32b ... main body mounting portion, 32c ... manifold side mounting portion, 32d ... exhaust introduction portion, 32e ... confluence portion, 32f ... high pressure side connection 32g ... Low pressure side connection part, 32h ... Partition wall, 33 ... Exhaust passage, 33A ... Exhaust part for communication, 34 ... Exhaust purification device, 4 ... Multistage supercharger, 40 ... High pressure supercharger, 41 ... Housing, 41a ... 1st discharge side connection part, 41b ... 2nd discharge side connection part, 41c ... Supercharger side attaching part, 42 ... High pressure side turbine chamber, 43 ... High pressure side compressor room, 43a ... Inlet port, 43b ... Discharge port , 43c ... suction side connection part, 43d ... discharge side connection part, 45 ... turbine wheel, 46 ... compressor wheel, 47 ... rotor shaft, 48 ... rubber sheet, 50 ... low pressure supercharger, 51 ... housing, 51a ... first Discharge side connection portion, 51b ... second discharge side connection portion, 51c ... supercharger side attachment portion, 52 ... low pressure side turbine chamber, 53 ... low pressure side compressor chamber, 53a ... intake port, 53b ... discharge port, 53c ... attachment Part 5 d ... Screw hole, 55 ... Turbine wheel, 56 ... Compressor wheel, 57 ... Rotor shaft, 60 ... Intake side connection passage, 61 ... Inlet side connection passage, 61a ... Suction port, 61b ... Discharge port, 61c ... First connection passage 61d ... second connection passage, 62 ... low pressure side connection passage, 62a ... suction port, 62b ... discharge port, 63 ... high pressure side connection passage, 63a ... suction port, 63b ... discharge port, 63c ... first passage, 63d ... Second passage 64, connection passage for communication, 64a ... discharge port, 65 ... blow-by gas connection passage (blow-by gas communication passage), 65a ... suction port, 65b ... first connection passage, 65c ... second connection passage, 66 ... Exhaust gas recirculation connection path (exhaust gas recirculation communication path), 66a ... Suction port (connection port), 70 ... Intake side supercharging path, 70a ... Connection body part, 71 ... Inlet side intake path, 72 ... Outlet side intake path, 73 ... low pressure Side intake passage, 74 ... Communication intake passage, 75 ... Intake side switching valve, 76 ... Inlet piping, 77 ... Outlet piping, 78 ... Insertion portion, 79 ... Water jacket portion, 79a ... First jacket portion, 79b ... Second Jacket part, 79c ... 3rd jacket part, 80 ... Exhaust side supercharging passage, 81 ... Inlet side exhaust passage, 82 ... High pressure side exhaust passage, 83 ... Low pressure side exhaust passage, 84 ... Exhaust passage for communication, 85 ... Exhaust side Switching valve, 90 ... exhaust part for communication, 91 ... second high pressure side connection part, 92 ... second low pressure side connection part, 93 ... exhaust passage connection part, 93a ... opening part, B ... bolt, B1 ... bolt head.

Claims (18)

In a supercharging device comprising a first supercharger having a first compressor chamber and a second supercharger having a second compressor chamber,
The supercharging device is provided with an intake side connection device having an inlet side intake passage for supplying air to the first compressor chamber and an outlet side intake passage for discharging air from the second compressor chamber,
The supercharging device, wherein the intake side connecting device is configured as a block body. The supercharging device according to claim 1,
The supercharging device, wherein the intake side connection device is provided with a communication intake passage that communicates the first compressor chamber and the second compressor chamber. The supercharging device according to claim 2,
The supercharging device, wherein the intake side connection device is provided with a low pressure side intake passage for discharging air from the first compressor chamber. The supercharging device according to claim 3,
The supercharging device, wherein the low pressure side intake passage is provided with a switching valve for switching an open / close state of a passage of the air flowing through the low pressure side intake passage. In the supercharging device according to claim 3 or claim 4,
In the intake side connection device, the discharge port of the outlet side intake passage and the discharge port of the low pressure side intake passage are provided on the same surface,
The supercharging device, wherein a discharge port of the outlet side intake passage and a discharge port of the low pressure side intake passage are connected by a common connection pipe. In the supercharging device as described in any one of Claims 1-5,
The inlet port of the inlet side intake passage is provided on a surface different from the surface on the side where the first supercharger is disposed in the intake side connection device and the surface on the side where the second supercharger is disposed. A supercharging device characterized in that The supercharging device according to claim 6,
A discharge port of the outlet side intake passage includes a surface on the side where the first supercharger is disposed in the intake side connection device, a surface on the side where the second supercharger is disposed, and the inlet side intake passage. A supercharging device characterized in that the supercharging device is provided on a surface different from a surface on which the suction port is provided. In the supercharging device as described in any one of Claims 1-7,
The supercharging device, wherein the intake side connection device is provided with a blow-by gas communication passage connected to a communication passage of a blow-by gas reduction device. The supercharging device according to claim 8,
The supercharger, wherein the blow-by gas communication passage is connected to the inlet side intake passage. In the supercharging device as described in any one of Claims 1-9,
The supercharging device, wherein the intake side connection device is provided with an exhaust gas recirculation passage connected to an exhaust gas recirculation passage of the exhaust gas recirculation device. The supercharging device according to claim 10,
The supercharging device, wherein the exhaust gas recirculation communication path is connected to the inlet side intake path. The supercharging device according to claim 10 or 11,
A connection port of the exhaust gas recirculation passage connected to the exhaust gas recirculation passage includes a surface on the side where the first supercharger is disposed, a surface on the side where the second supercharger is disposed, and the inlet side intake air A supercharging device, wherein the supercharging device is provided on a surface different from a surface where a suction port of the passage is provided and a surface where a discharge port of the outlet side intake passage is provided. In the supercharging device as described in any one of Claims 1-12,
The supercharging device, wherein the suction port of the first compressor chamber is disposed to face the suction port of the second compressor chamber. The supercharging device according to claim 13,
The supercharging device, wherein the intake side connection device is provided between the first compressor chamber and the second compressor chamber. The supercharging device according to claim 14,
The physique of the first supercharger is configured to be smaller than the physique of the second supercharger,
The intake side connection device and the second supercharger are fixed to each other by bolts,
The supercharging device, wherein the bolt is inserted from a surface opposite to a surface on the side where the second supercharger is arranged in the intake side connection device. In the supercharging device as described in any one of Claims 1-15,
The discharge port of the first compressor chamber, the suction port of the first compressor chamber, the discharge port of the second compressor chamber, and the suction port of the second compressor chamber are corresponding openings of the intake side connection device. Inserted into
Between the opening and at least one of the discharge port of the first compressor chamber, the suction port of the first compressor chamber, the discharge port of the second compressor chamber, and the suction port of the second compressor chamber Is provided with an elastic member. An internal combustion engine comprising the supercharging device according to any one of claims 13 to 16.
The first supercharger is provided with a first turbine chamber, the second supercharger is provided with a second turbine chamber,
Between the first turbine chamber and the second turbine chamber, there is provided a communication exhaust passage that allows the first turbine chamber and the second turbine chamber to communicate with each other.
The internal combustion engine, wherein the communication exhaust passage is provided integrally with an exhaust manifold. In the supercharging device as described in any one of Claims 1-17,
The first supercharger and the second supercharger are connected in series in the air flow direction,
The first supercharger has a higher compression ratio than the second supercharger,
The supercharger characterized in that the second supercharger is larger in size than the first supercharger.

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