JP7303092B2 - internal combustion engine - Google Patents

Description

This invention relates to internal combustion engines.

The internal combustion engine disclosed in Patent Document 1 includes a supercharger that pumps intake air using the flow of exhaust gas. That is, the turbocharger is arranged across the intake passage and the exhaust passage. A turbine housing containing a turbine of the supercharger is arranged in the exhaust passage. The turbine housing is covered with a heat insulating insulator.

JP 2013-148068 A

In the technique disclosed in Patent Document 1, in which the turbine housing is covered with an insulator, a heat insulating material is interposed between the outer surface of the turbine housing and the insulator so that the thermal influence of the turbine housing can be kept in the vicinity of the turbine housing. be. However, when the heat insulating material is arranged on the outer surface of the turbine housing, depending on the position of the heat insulating material, heat cannot escape from the turbine housing, and the turbine housing may overheat.

An internal combustion engine for solving the above problems includes a turbocharger that pumps intake air using the flow of exhaust gas, and a heat insulating insulator that surrounds at least a portion of a turbine housing of the turbocharger from the outside. wherein the insulator is spaced apart from the outer surface of the turbine housing, and the space defined by the insulator and the outer surface of the turbine housing is defined by the internal combustion engine mounted on a vehicle. A heat insulating material is interposed in a gap between the insulator and the outer surface of the turbine housing, and the heat insulating material, the insulator, and the outer surface of the turbine housing form the A passage from the opening of the space in front of the vehicle to the opening in the rear of the vehicle is defined.

By providing a flow path extending from the front of the vehicle to the rear of the vehicle as in the above configuration, the running wind can easily flow through the flow path. Then, when running wind flows through the flow path, heat dissipation from the outer surface of the turbine housing is promoted. Therefore, the turbine housing can be cooled.

1 is a schematic diagram of an internal combustion engine viewed from the front of a vehicle; FIG. Schematic diagram of an internal combustion engine viewed from the left side of the vehicle. FIG. 2 is a plan view of the first supercharger and the insulator as seen from the left side of the vehicle; The top view of the 1st supercharger and the insulator which were seen from the vehicle rear. The figure which represented the state which divided the 1st supercharger into two.

An embodiment of an internal combustion engine will be described below with reference to the drawings.
First, the schematic configuration of the internal combustion engine will be described.
As shown in FIG. 1, an internal combustion engine 10 is arranged in an engine room 120 of a vehicle. An engine body 20 of the internal combustion engine 10 includes a cylinder block 22 in which cylindrical cylinders 22a are defined. Six cylinders 22a are partitioned, and fuel is combusted inside these cylinders 22a. As shown in FIG. 2 , three cylinders 22 a among the six cylinders 22 a are arranged in the direction of the central axis of the crankshaft 12 on one side of the central axis of the crankshaft 12 . These three cylinders 22a constitute a cylinder group on the first bank 10A side. The other three cylinders 22a are arranged in the direction of the central axis of the crankshaft 12 on the other side of the central axis of the crankshaft 12 . These three cylinders 22a constitute a cylinder group on the second bank 10B side. As shown in FIG. 1, the cylinder group on the side of the first bank 10A and the cylinder group on the side of the second bank 10B are inclined so as to approach each other downward. That is, the cylinder group on the first bank 10A side and the cylinder group on the second bank 10B side are arranged in a V shape.

A box-shaped oil pan 24 is fixed to the lower end surface of the cylinder block 22 . Oil for lubricating various parts of the engine body 20 is stored in the bottom of the oil pan 24 . A crankshaft 12 is rotatably supported between the cylinder block 22 and the oil pan 24 . 1 and 2 show the crankshaft 12 in a simplified manner.

As shown in FIG. 1, a first cylinder head 26 is attached to the upper portion of the cylinder block 22 so as to face the cylinder group on the first bank 10A side. Although not shown, the first cylinder head 26 is provided with an intake port for each cylinder 22a for supplying intake air to each cylinder 22a of the cylinder group on the first bank 10A side. In the first cylinder head 26, an exhaust port for discharging exhaust gas from each cylinder 22a of the cylinder group on the first bank 10A side is defined for each cylinder 22a.

A second cylinder head 28 is attached to the upper portion of the cylinder block 22 so as to face the cylinder group on the side of the second bank 10B. Similarly to the first cylinder head 26, the second cylinder head 28 has an intake port for each cylinder 22a and an exhaust port for each cylinder 22a. Thus, in this embodiment, the engine body 20 is composed of the cylinder block 22 , the oil pan 24 , the first cylinder head 26 and the second cylinder head 28 .

The engine body 20 is arranged in the engine room 120 such that the central axis of the crankshaft 12 is aligned with the longitudinal direction of the vehicle. The cylinder group on the first bank 10A side is positioned to the left of the central axis of the crankshaft 12 in the vehicle, that is, to the left of the central axis of the crankshaft 12 as viewed from the vehicle compartment. The group is located to the right of the central axis of the crankshaft 12 in the vehicle, that is, to the right of the central axis of the crankshaft 12 as viewed from the vehicle compartment.

A first intake passage 31 is connected to each intake port of the first cylinder head 26 via an intake manifold branched for each intake port. A first exhaust passage 32 is connected to each exhaust port of the first cylinder head 26 via an exhaust manifold that merges these exhaust ports. As shown in FIG. 2, a first supercharger 34 is attached to the first intake passage 31 and the first exhaust passage 32 so as to straddle them. Specifically, a compressor housing 41 of the first turbocharger 34 is arranged in the middle of the first intake passage 31 . A compressor wheel 42 for pumping intake air is housed inside the compressor housing 41 . A turbine housing 45 of the first supercharger 34 is arranged in the middle of the first exhaust passage 32 . A turbine wheel 46 that rotates using the flow of exhaust gas is housed inside the turbine housing 45 . Turbine wheel 46 and compressor wheel 42 are fixed to opposite ends of shaft 44 and rotate coaxially. As the turbine wheel 46 rotates with the flow of the exhaust gas, the compressor wheel 42 rotates together with the turbine wheel 46 to pressure-feed the intake air. In this manner, the first supercharger 34 is of an exhaust drive type that uses the flow of the exhaust gas to pressure-feed the intake air.

The first turbocharger 34 is arranged such that the central axis of the shaft 44 extends along the vehicle front-rear direction. Note that the turbine wheel 46 is positioned behind the compressor wheel 42 in the vehicle. In this state, the first turbocharger 34 is arranged generally above the engine body 20 and at the front end of the engine body 20 . As shown in FIG. 1 , the first supercharger 34 is positioned between the first cylinder head 26 and the second cylinder head 28 in the left-right direction of the vehicle, and is located on the first cylinder head 26 side. It's coming.

A part of a wire harness 37 that is a bundle of electric wires is arranged near the first supercharger 34 . A portion of the wire harness 37 is positioned diagonally to the upper left of the vehicle with respect to the first supercharger 34 . Between the wire harness 37 and the first turbocharger 34, there are no other parts except for heat shielding parts such as an insulator 50, which will be described later. Note that the wire harness 37, which is an electrical component, is a protected component that needs to be protected from high-temperature heat from the surroundings in order to prevent malfunction due to high temperatures.

Although not shown, like the first cylinder head 26, each intake port of the second cylinder head 28 is connected to a second intake passage, and each exhaust port of the second cylinder head is connected to a second exhaust passage. ing. As shown in FIG. 1, a second turbocharger 36 having the same configuration as the first turbocharger is provided across the second intake passage and the second exhaust passage. Like the first supercharger 34 , the second supercharger 36 is arranged substantially above the engine body 20 and at the front end of the engine body 20 . In addition, the second supercharger 36 is located between the first cylinder head 26 and the second cylinder head 28 in the left-right direction of the vehicle, and is closer to the second cylinder head 28 side.

A portion of a cooling water hose 38 through which cooling water flows is arranged in the vicinity of the second supercharger 36 . A portion of the cooling water hose 38 is positioned obliquely above the right side of the vehicle with respect to the second supercharger 36 . Between the cooling water hose 38 and the second supercharger 36, there are no other parts other than a heat shielding part such as an insulator 50, which will be described later. In addition, the cooling water hose 38 is a protected component that needs to be protected from high-temperature heat from the surroundings because it is necessary to prevent the temperature of the cooling water flowing through it from rising.

A supply pump 39 for pumping fuel to each cylinder 22a is arranged in the vicinity of the second supercharger 36. As shown in FIG. The supply pump 39 is positioned substantially directly below the second supercharger 36 . Between the supply pump 39 and the second supercharger 36, there are no parts other than heat shielding parts such as an insulator 50, which will be described later. It should be noted that the supply pump 39, which is an electrical component, is a protected component that must be protected from high-temperature heat from the surroundings in order to prevent malfunction due to high temperatures.

Next, the structure of the turbine housing 45 of the first supercharger 34 will be specifically described.
As shown in FIGS. 1 and 4 , the turbine housing 45 includes a generally cylindrical central portion 71 and a scroll portion 72 extending so as to surround the outer circumference of the central portion 71 . The scroll portion 72 extends over substantially the entire circumference of the central portion 71 in the circumferential direction. In addition, in FIG. 1, the outline shape of the center part 71 and the scroll part 72 is represented by the dotted line.

As shown in FIGS. 3 and 4, the scroll portion 72 as a whole spirally extends from near the center of the central portion 71 toward one end of the central portion 71 in the direction of the central axis J of the central portion 71. are doing. That is, the scroll portion 72 is arranged closer to the compressor housing 41 in the central axis J direction of the central portion 71 . A scroll passage 77 through which the exhaust gas flows is defined inside the scroll portion 72 . At the upstream end of the scroll portion 72, a flange 79 for connecting an exhaust passage on the upstream side of the turbine housing 45 protrudes outward. Holes 79H through which bolts are inserted pass through the flange 79 . Note that the upstream end of the scroll portion 72 is located at the other end of the central portion 71 in the central axis J direction of the central portion 71 .

As shown in FIG. 4, the central portion 71 defines an exhaust passage 76 in which the turbine wheel 46 is accommodated. The discharge passage 76 communicates with the scroll passage 77 of the scroll portion 72 . The discharge passage 76 extends along the central axis J direction of the central portion 71 and opens at the other end of the central portion 71 in the central axis J direction. A flange 78 for connecting an exhaust passage on the downstream side of the turbine housing 45 protrudes outward from the edge of this opening. Holes 78H through which bolts are inserted pass through the flange 78 . Note that the central axis J of the central portion 71 and the central axis of the turbine wheel 46 are aligned.

As shown in FIG. 3, when the turbine housing 45 is attached to the internal combustion engine 10 as part of the first exhaust passage 32, the direction of the central axis J of the central portion 71 coincides with the longitudinal direction of the vehicle. One side of the central portion 71 in the direction of the center axis J is oriented toward the front of the vehicle, and the other side of the center portion 71 in the direction of the center axis J is oriented toward the rear of the vehicle. That is, in the turbine housing 45, the scroll portion 72 is positioned in front of the vehicle, and the flange 78 of the central portion 71 and the flange 79 of the scroll portion 72 are positioned in the rear of the vehicle.

Next, the heat shield structure of the turbine housing 45 will be described.
As shown in FIGS. 3 and 4, the turbine housing 45 is covered with a plate-like heat insulating insulator 50 . As shown in FIG. 5, the insulator 50 is formed by joining together a pair of half-split bodies each having a shape of a cylinder divided into two along its axial direction by welding or the like. The insulator 50 has a cylindrical shape as a whole. As shown in FIGS. 3 and 4 , the insulator 50 surrounds the turbine housing 45 from the radially outer side of the central portion 71 . As shown in FIG. 3 , the insulator 50 extends from the front end to the rear end of the turbine housing 45 with respect to the central axis J direction of the central portion 71 . That is, the insulator 50 covers substantially the entire turbine housing 45 from the outside.

As shown in FIG. 3 , the insulator 50 is one size larger than the turbine housing 45 in the radial direction of the central portion 71 . As a result, the insulator 50 is spaced apart from the turbine housing 45 . A space defined by the insulator 50 and the outer surface of the turbine housing 45 opens forwardly and rearwardly of the vehicle. A front opening K1, which is an opening of the space in front of the vehicle, is defined by an outer surface of the scroll portion 72 of the turbine housing 45 and an edge of the insulator 50 in front of the vehicle. As shown in FIG. 4, a rear opening K2, which is an opening of the space at the rear of the vehicle, is defined by a flange 78 of the central portion 71, a flange 79 of the scroll portion 72, and an edge of the insulator 50 at the rear of the vehicle.

As shown in FIG. 4 , a heat insulating material 80 is interposed in a gap S between the insulator 50 and the outer surface of the turbine housing 45 . The insulator 50 is supported by the turbine housing 45 via this heat insulating material 80 . In addition, in FIG. 4, the insulator 50 is shown in a partially notched state. As shown in FIG. 3 , the heat insulating material 80 is arranged in a portion of the insulator 50 closer to the front than the center in the vehicle front-rear direction. Specifically, the heat insulating material 80 is arranged in a portion of the insulator 50 covering the scroll portion 72 of the turbine housing 45 (hereinafter referred to as a scroll covering portion 50a). A plurality of heat insulating materials 80 are arranged. As shown in FIG. 5, there are six insulations 80 in this embodiment. The six heat insulators 80 are spaced apart from each other in the circumferential direction of the turbine housing 45 .

As shown in FIG. 4 , four of the six heat insulators 80 are arranged above the central axis J of the central portion 71 of the turbine housing 45 . These heat insulators 80 arranged above the central axis J of the central portion 71 of the turbine housing 45 constitute an upper heat insulator 80A. As shown in FIG. 3, the upper heat insulating material 80A is arranged in the scroll cover portion 50a of the insulator 50 at a position closer to the rear of the vehicle. Note that, as shown in FIG. 4 , two of the four upper heat insulating materials 80A are arranged on the vehicle left side of the central axis J of the central portion 71 . As shown in FIGS. 1 and 4, one of the two upper heat insulators 80A is between the turbine housing 45 and the wire harness 37 arranged obliquely to the upper left of the first supercharger 34. positioned. It should be noted that FIG. 1 schematically shows the arrangement of only the heat insulating material 80 positioned between the part to be protected and the turbine housing 45 .

As shown in FIG. 4 , two of the six heat insulators 80 are arranged below the central axis J of the central portion 71 of the turbine housing 45 . Note that one of these two heat insulators 80 is hidden and not visible in FIG. The two heat insulators 80 arranged below the central axis J of the central portion 71 of the turbine housing 45 constitute a lower heat insulator 80B. Each of the two lower heat insulating materials 80B is arranged so that at least a portion thereof is located on the opposite side of the center axis J of the central portion 71 from the upper heat insulating material 80A. As shown in FIG. 3, the lower heat insulating material 80B is arranged in the scroll cover portion 50a of the insulator 50 at a position closer to the front of the vehicle.

As shown in FIG. 3 , the heat insulating material 80 , the insulator 50 , and the outer surface of the turbine housing 45 define a running wind flow path 90 through which the running wind flows. As described above, the upper heat insulating material 80A is arranged in the scroll cover portion 50a of the insulator 50 at a position closer to the rear of the vehicle. Further, in the vehicle front side of the upper heat insulating material 80A and above the central axis J of the central portion 71, the gap S between the insulator 50 and the outer surface of the turbine housing 45 is not closed and is connected to the front opening K1. . This gap S portion ahead of the vehicle with respect to the upper heat insulating material 80A forms a flow path upstream portion 90a, which is an upstream portion of the traveling air flow path 90. As shown in FIG.

As described above, the lower heat insulating material 80B is arranged in the scroll cover portion 50a of the insulator 50 at a position closer to the front of the vehicle. Further, at the rear of the vehicle from the lower heat insulating material 80B and below the central axis J of the central portion 71, the gap S between the insulator 50 and the outer surface of the turbine housing 45 is not closed and is connected to the rear opening K2. there is This gap S portion behind the vehicle from the lower heat insulating material 80B forms a flow passage downstream portion 90c, which is the downstream portion of the traveling air flow passage 90. As shown in FIG.

A gap S positioned between the upstream portion 90a and the downstream portion 90c of the flow path serves as a midstream portion 90b connecting the upstream portion 90a and the downstream portion 90c. The midstream portion 90b of the flow path exists on both the left side and the right side of the vehicle with the central axis J of the central portion 71 interposed therebetween. In other words, the flow channel upstream portion 90a and the flow channel downstream portion 90c are communicated with each other at two left and right flow channel midstream portions 90b. A channel upstream portion 90a located above the center axis J of the center portion 71, a channel downstream portion 90c located below the center axis J of the center portion 71, and these channel upstream portions. The traveling air flow path 90 is connected over the entire circumferential direction of the central portion 71 by the flow path midstream portion 90b that communicates with the flow path downstream portion 90c.

In addition, as shown in FIG. 1 , the turbine housing of the second supercharger 36 is covered with an insulator 50 as in the case of the first supercharger 34 . A plurality of heat insulating materials 80 are interposed between the turbine housing of the second supercharger 36 and the insulator 50 . These heat insulating materials 80 partition the running air flow path together with the insulator 50 and the outer surface of the turbine housing. Part of the upper heat insulating material 80A is positioned between the cooling water hose 38 and the turbine housing. Also, part of the lower heat insulating material 80B is located between the supply pump 39 and the turbine housing.

Next, the flow of running air around the first turbocharger 34 will be described as an operation of the present embodiment. Here, the flow of running air will be described using the first supercharger 34 as an example, but similar flows also occur around the second supercharger 36 .

As indicated by the arrow Z1 in FIG. 2, while the vehicle is running, the running wind flows in the engine room 120 from the front of the vehicle toward the rear of the vehicle. Since the first supercharger 34 is positioned at the front end of the engine body 20 , part of the running wind from the front of the vehicle toward the internal combustion engine 10 reaches the first supercharger 34 . Here, as shown in FIG. 1 , the first turbocharger 34 is positioned generally above the engine body 20 . Although not shown, there are various parts between the first supercharger 34 and the engine body 20 in the vertical direction. Since these parts block the running wind, it is difficult for the running wind to flow below the first supercharger 34 . On the other hand, almost no other parts exist above the first supercharger 34 . Therefore, the running wind is more likely to circulate above the first supercharger 34 .

As indicated by arrow Z2 in FIG. 2 , part of the running wind flowing above the first supercharger 34 toward the rear of the vehicle is directed toward the turbine housing 45 . This running wind flows into the upstream portion 90a of the running wind channel 90 through the front opening K1, as indicated by an arrow Z3 in FIG. The flow direction of the running wind that has flowed into the flow path upstream portion 90a is changed downward by the upper heat insulating material 80A that is positioned behind the vehicle relative to the flow path upstream portion 90a. Then, the running wind reaches from the upstream portion 90 a of the flow path to the midstream portion 90 b of the flow path, and flows through the midstream portion 90 b of the flow path in the circumferential direction of the central portion 71 of the turbine housing 45 . Further, in the midstream portion 90b of the flow path, the flow direction of the running wind is changed toward the rear of the vehicle by the lower heat insulating material 80B positioned below the center axis J of the center portion 71. As shown in FIG. Therefore, as indicated by an arrow Z4 in FIG. 3, in the midstream portion 90b of the flow path, the running wind as a whole flows downward and rearward of the vehicle. Then, the running wind reaches the downstream portion 90c of the flow path behind the vehicle from the lower heat insulating material 80B. After that, as indicated by an arrow Z5 in FIG. 3, the running wind flows rearward of the vehicle and flows out of the flow passage downstream portion 90c through the rear opening K2.

Such flow of running wind is generated on both the left side and the right side of the vehicle across the center axis J of the center portion 71 . In each of the left side of the vehicle and the right side of the vehicle with respect to the center axis J of the center portion 71, the running wind flows from the flow path upstream portion 90a to the flow path downstream portion 90c as described above. It flows in the circumferential direction of 71 over approximately 180 degrees.

Next, the effects of this embodiment will be described.
(1) High-temperature exhaust gas flows inside the turbine housing 45 . If the turbine housing 45 is overheated by the exhaust heat, the turbine housing 45 is likely to deteriorate.

In the above configuration, the running wind passes through the running wind flow path 90 defined by the outer surface of the turbine housing 45, the insulator 50, and the heat insulating material 80 from the front of the vehicle to the rear of the vehicle, as described above. Such a flow of running wind promotes heat dissipation on the outer surface of the turbine housing 45 . Therefore, the turbine housing 45 can be efficiently cooled.

(2) As described above, there are various parts between the first turbocharger 34 and the engine body 20 in the vertical direction. Difficult to circulate.
In the above configuration, the running wind flowing through the running wind passage 90 flows in the circumferential direction of the center portion 71 over approximately 180 degrees, and thus flows from above the center axis J of the center portion 71 to below the center axis J. reach. Therefore, it is possible to cool even the lower portion of the turbine housing 45 where it is difficult for the running wind to flow.

(3) In the above configuration, the heat insulating material 80 is arranged between the turbine housing 45 and parts requiring protection such as the wire harness 37 and the cooling water hose 38 . Therefore, it is possible to prevent the heat of the turbine housing 45 from reaching the parts requiring protection.

(4) In the above configuration, the upper heat insulating material 80A and the lower heat insulating material 80B are arranged so as to be located on opposite sides of each other with the central axis J of the central portion 71 interposed therebetween. Therefore, the position of the insulator 50 attached to the turbine housing 45 is stabilized.

In addition, this embodiment can be changed and implemented as follows. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
- The number and arrangement of the heat insulating materials 80 are not limited to the example of the above embodiment. As long as the heat insulating materials 80 are arranged so as to partition the running air flow path 90 from the front opening K1 to the rear opening K2, the number and position of the heat insulating materials 80 do not matter. For example, instead of arranging the upper heat insulating material 80A and the lower heat insulating material 80B on opposite sides of the center axis J of the central part 71, the heat insulating material 80 is arranged every 120 degrees in the circumferential direction of the central part 71. may be placed. If the heat insulators 80 are arranged at equal intervals in the circumferential direction of the central portion 71 in this way, the position of the insulator 50 can be stabilized outside the turbine housing 45 .

・Regarding the number and arrangement of the heat insulating materials 80, if parts requiring protection different from those in the above embodiment are arranged in the vicinity of the first turbocharger 34 or the second turbocharger 36, the parts requiring protection and the turbine housing 45 You may arrange|position the heat insulating material 80 in the position used as between.

• It is not essential that the heat insulating material 80 is arranged between the part to be protected and the turbine housing 45 . For example, a member that blocks heat from the surroundings may be attached to the part to be protected.

- As the number and positions of the heat insulating materials 80 are changed, the traveling air flow path 90 does not have to be connected to the entire circumferential direction of the central portion 71 . For example, the running air flow path 90 may be connected to only half the circumference of the central portion 71 . As long as the running air flow path 90 extends from the front opening K1 to the rear opening K2, the running air flow easily flows through the running air flow path 90, and heat dissipation from the turbine housing 45 can be promoted.

- The shape of the insulator 50 is not limited to the example of the above embodiment. The insulator 50 may have any shape as long as the space defined by the outer surface of the turbine housing 45 and the insulator 50 is open to the front and rear of the vehicle. The insulator 50 may have, for example, a rectangular tubular shape.

- The shape of the insulator 50 may be changed so that the turbine housing 45 is surrounded not only by the insulator 50 but also by combining the insulator 50 and other parts. For example, the insulator 50 is configured in a half-cylinder shape by dividing a cylinder in its axial direction. Then, the insulator 50 is attached to the outer surface of the engine body 20 with the first turbocharger 34 interposed therebetween. With such a configuration, the first supercharger 34 may be surrounded by the insulator 50 and the outer surface of the engine body 20 . In this manner, the insulator 50 may surround at least a portion of the turbine housing 45 . Even when the insulator 50 and other parts are combined to surround the turbine housing 45 as described above, the space defined by the insulator 50, the other parts, and the outer surface of the turbine housing 45 is open to the front and rear of the vehicle. All you have to do is

- The shape of the turbine housing 45 is not limited to the example of the above embodiment. The shape of the insulator 50 may be changed according to the shape of the turbine housing 45 .
- The configuration of the engine body 20 is not limited to the example of the above embodiment. For example, the number of cylinders 22a may be changed. The engine body 20 may be configured as a so-called serial type in which all the cylinders 22a are arranged in the central axis direction of the crankshaft 12 .

- The arrangement of the engine body 20 in the engine room 120 is not limited to the example of the above embodiment. For example, the engine body 20 may be arranged in the engine room 120 so that the central axis of the crankshaft 12 is along the lateral direction of the vehicle. In this case, by changing the shape of the insulator 50 or changing the orientation of the first supercharger 34 or the second supercharger 36, the space defined by the insulator 50 and the outer surface of the turbine housing 45 can be changed. What is necessary is just to comprise so that it may open to the vehicle front and a vehicle rear.

K1... Front opening K2... Rear opening 10... Internal combustion engine 34... First supercharger 36... Second supercharger 45... Turbine housing 50... Insulator 80... Heat insulating material 90... Running wind flow path

Claims (1)

a cylinder block in which cylinders are partitioned;
a turbocharger that pressure-feeds intake air to the cylinder using the flow of exhaust gas from the cylinder and is arranged above the cylinder block ;
An internal combustion engine comprising a heat insulating insulator surrounding at least a portion of a turbine housing of the turbocharger from the outside,
The insulator is spaced apart from the outer surface of the turbine housing,
A space defined by the insulator and the outer surface of the turbine housing is open to the front and rear of the vehicle when the internal combustion engine is mounted on the vehicle,
A heat insulating material is interposed in a gap between the insulator and the outer surface of the turbine housing,
The heat insulating material, the insulator, and the outer surface of the turbine housing define a flow path from an opening of the space in front of the vehicle to an opening in the rear of the vehicle ,
The heat insulating material includes an upper heat insulating material and a lower heat insulating material arranged below the upper heat insulating material,
The lower heat insulating material is arranged in front of the vehicle with respect to the upper heat insulating material.
internal combustion engine.

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