JP6344404B2 - Engine intake cooling system - Google Patents

Description

  The present invention relates to an intake air cooling device for an engine, and more particularly to an intake air cooling device for an engine that contributes to an improvement in the assembly of the engine.

  In the engine (internal combustion engine), the lower the intake air temperature, the higher the intake air density, and hence the intake air mass, so that more fuel can be burned and the output is improved. Therefore, an intercooler is provided in the intake passage to cool the intake air, particularly in an engine with a supercharger.

  In this case, in order to efficiently introduce the low-temperature intake air into the cylinder, a water-cooled intercooler is applied, and the intercooler is integrated on the upstream side of the intake manifold so that the intercooler becomes more intake port. It is effective to arrange them close to each other. For example, Patent Document 1 discloses such an air supply and cooling device for an internal combustion engine.

JP 2001-248448 A

  When the intercooler is installed integrally upstream of the intake manifold, if the intercooler position is lower than the intake port position, water (condensed water) accumulates in the intercooler and is introduced into the combustion chamber along with the intake air. This is one of the causes of misfire. Therefore, it is desirable that the position of the intercooler is relatively high so that condensed water is quickly introduced into the combustion chamber without accumulating in the intercooler. However, due to the relationship with the bonnet height, there are also restrictions on raising the position of the intercooler.

  Therefore, it is preferable that the intercooler is disposed immediately outside the intake manifold (on the side opposite to the cylinder head) within a range not lower than the position of the intake port. However, since the intake manifold is fastened to the side surface of the cylinder head with bolts and nuts, when the intercooler is integrally provided just outside the intake manifold, the intercooler becomes an obstacle (the position where the intake manifold is fastened). However, there is a problem that the assembly work of the engine is impaired due to difficulty in fastening the intake manifold.

  The present invention has been made in view of the above circumstances, and an intercooler can be integrally provided immediately outside the intake manifold (on the opposite side of the cylinder head) without hindering the assembly of the engine. Another object is to provide an intake air cooling device for an engine.

In order to solve the above-described problems, the present invention provides a cylinder head having a side surface in which an intake port opens, an intake manifold fixed to the side surface and communicating with the intake port, and a side of the cylinder head. An air-cooling device for a multi-cylinder engine with a supercharger provided with an intercooler that cools intake air , wherein the engine is a turbocharger that pressurizes intake air by energy of exhaust gas, and the turbocharger A main intake passage for guiding the intake air pressurized by the machine, and a passage branched from the main intake passage, the electric supercharger pressurizing the intake air by the driving force of the electric motor, and the electric supercharger and a branch intake passage for guiding the intake air pressurized, the intake manifold, Mani extending substantially horizontally in a direction perpendicular to the fastening has been cylinder row direction to the cylinder head Including a cooler main body and a cooler component that is integrally connected to the upstream end of the manifold main body in the intake flow direction and constitutes a lower end of the intercooler, and the cooler component is defined as a second cooler component In addition, the intercooler includes a first cooler component that is assembled to an upper portion of the second cooler component, and is configured by the first cooler component and the second cooler component , The first cooling core is connected to the main intake passage and circulates the refrigerant, and the second cooling core is connected to the branched air passage and connected to the second cooler component. are, and upwardly open recess is provided for further guiding the said manifold body while accepting the cooled air by the cooling core, said manifold The yield body has a plurality of fixing portions fastened to the side surface of the cylinder head, and the plurality of fixing portions are more than the second cooler constituting portion in a side view along a direction orthogonal to the cylinder row direction. It is located outside.

According to this configuration, the second cooler component that forms the lower end portion of the intercooler is provided in the intake manifold, and the first cooler component is fixed to the upper portion of the second cooler component. An intercooler is configured by the first cooler component and the second cooler component. For this reason, the intercooler is placed just outside the intake manifold (manifold body) (on the opposite side of the cylinder head) while suppressing the position of the intercooler from being lower than the intake port and preventing the intercooler from protruding significantly above the engine. Can be provided integrally. In addition, since each fixed portion of the intake manifold is located outside the second cooler component in a side view along the direction orthogonal to the cylinder row direction, the first cooler component is changed from the second cooler component. In the separated state, the fixing part is fastened to the side surface of the cylinder head, and then the first cooler constituent part is fixed to the upper part of the second cooler constituent part. Can be assembled. Therefore, according to the above configuration, the intercooler can be integrally provided immediately outside the intake manifold (manifold body) (on the side opposite to the cylinder head) without hindering the assembly of the engine.
Further, since the cooling core is provided in the first cooler component, the volume (occupied space) of the second cooler component can be kept small, and its weight can be reduced. Therefore, this contributes to improvement in workability of assembling the intake manifold to the cylinder head.
In particular, the intake air introduced into the intercooler through the main intake passage passes through the first and second cooling cores, and the intake air introduced into the intercooler through the branch intake passage passes only through the second cooling core. . Therefore, it is possible to appropriately cool the intake air according to the intake path.

  More specifically, the manifold body has a shape extending in the cylinder row direction, and includes the fixing portions at a plurality of positions in the cylinder row direction, and the second portion of the fixing portions in the side view. The fixing portion at a position corresponding to the cooler configuration portion extends above the upper surface of the second cooler configuration portion or below the lower surface of the second cooler configuration portion, so that the first portion in the side view is displayed. It is located outside the two cooler components.

  According to this configuration, in the side view, the fixing portion at a position corresponding to the second cooler component can be favorably disposed outside the second cooler component in the side view.

  In this case, it is preferable that the second cooling core circulates a refrigerant having a temperature lower than that of the first cooling core.

  According to this configuration, since the intake air is efficiently cooled in two stages, it is possible to further increase the cooling efficiency of the intake air.

  In the above-described intake air cooling device, it is preferable that the inner bottom surface of the concave portion is inclined downward toward the manifold body in a direction orthogonal to the cylinder row direction.

  According to this configuration, even when moisture in the intake air is condensed and dropped in the intercooler, the condensed water is promptly introduced to the intake port along with the intake air while being guided along the inner bottom surface of the recess. be introduced. Therefore, it is possible to effectively prevent the condensed water from accumulating at the inner bottom portion of the intercooler, and to prevent troubles such as misfire caused by introducing a lot of condensed water into the cylinder at a time. Become.

  As described above, according to the intake air cooling device for an engine according to the present invention, an intercooler can be integrally provided immediately outside the intake manifold (on the side opposite to the cylinder head) without impairing the assembly of the engine. It becomes.

1 is an overall configuration diagram of an engine including an intake air cooling device according to a first embodiment of the present invention. It is the perspective view which looked at the engine from the intake side. It is a top view of the engine. It is a front view of the engine which shows an intake manifold and an intercooler. It is an assembly perspective view of the intake manifold and the intercooler. It is a disassembled perspective view of the said intake manifold and the said intercooler. It is sectional drawing (VII-VII sectional view taken on the line of FIG. 6) of a high-order intake manifold. It is a perspective view of an engine body showing the assembled state of the intake manifold. It is a front view of the engine which shows the intake manifold and intercooler of the intake-air-cooling apparatus which concern on 2nd Embodiment of this invention. It is a front view of the engine body showing the assembled state of the intake manifold.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.
(Entire engine configuration)
FIG. 1 is an overall configuration diagram of an engine provided with an intake air cooling device according to the present invention. An engine 1 shown in FIG. 1 is an in-line four-cylinder four-cycle diesel engine mounted on a vehicle as a driving power source. In the following description, “upstream” and “downstream” are based on the flow direction of the fluid (intake, exhaust, cooling water) flowing through the object.

  The engine body 2 of the engine 1 includes a cylinder block 10 having a plurality of cylinders 10a (only one is shown in the figure), a cylinder head 11 disposed on the cylinder block 10, and a lower side of the cylinder block 10. And an oil pan 12 in which lubricating oil is stored. The engine body 2 is mounted vertically in an engine room at the front of the vehicle so that the cylinder row direction faces the vehicle front-rear direction.

  A piston 13 is fitted into each cylinder 10a of the engine body 2 so as to be able to reciprocate. A crankshaft 14 is connected to the piston 13 via a connecting rod 13b, and the crankshaft 14 rotates about the central axis in accordance with the reciprocating motion of the piston 13.

  The cylinder head 11 is formed with an intake port 15 and an exhaust port 16 that open to the combustion chamber of each cylinder 10a, and an intake valve 17 and an exhaust valve 18 for opening and closing the intake port 15 and the exhaust port 16. Is provided. One injector 19 for injecting fuel mainly composed of light oil is provided for each cylinder 10a.

  An intake passage 20 is connected to one side surface of the cylinder head 11, specifically, an intake side surface where the intake port 15 opens, so as to communicate with the intake port 15 of each cylinder 10 a, and the cylinder head An exhaust passage 30 is connected to the other side surface of the cylinder 11, that is, the exhaust side surface where the exhaust port 16 opens, so as to communicate with the exhaust port 16 of each cylinder 10a.

  The intake passage 20 includes an intake manifold 21 fixed to the cylinder head 11, an intercooler 22 provided integrally with the intake manifold 21, and a main intake passage 23 connected to the upstream end of the intercooler 22. .

  The intake passage 20 (main intake passage 23) and the exhaust passage 30 are provided with a large first turbocharger 41 and a second turbocharger 42 smaller than that.

  The first turbocharger 41 includes a compressor 41 a disposed in the main intake passage 23, and a turbine 41 b connected coaxially with the compressor 41 a and disposed in the intake passage 20. Similarly, the second turbocharger 42 includes a compressor 42 a disposed in the main intake passage 23, and a turbine 42 b connected coaxially with the compressor 42 a and disposed in the exhaust passage 30. Yes.

  The compressor 41a of the first turbocharger 41 is disposed on the upstream side of the main intake passage 23 with respect to the compressor 42a of the second turbocharger 42, and the turbine 41b of the first turbocharger 41 is provided. Is disposed on the downstream side of the exhaust passage 30 with respect to the turbine 42 b of the second turbocharger 42.

  An air cleaner 24 for filtering intake air is provided at an upstream end portion of the intake passage 20 (main intake passage 23). Between the air cleaner 24 and the intake manifold 21, the air cleaner 24 is arranged in order from the upstream side. The compressors 41a and 42a of the first turbocharger 41 and the second turbocharger 42, the throttle valve 25 that can be opened and closed for adjusting the cross-sectional area of the intake passage 20, and the compressors 41a and 42a are used for compression (acceleration). The intercooler 22 is provided for cooling the pressurized air.

  On the downstream side of the second turbocharger 42 (compressor 42a) in the main intake passage 23, a bypass passage 26 (corresponding to the branched intake passage of the present invention) that bypasses the throttle valve 25 is provided. The bypass passage 26 branches from the main intake passage 23 at a position upstream of the throttle valve 25 and is joined to the main intake passage 23 at a position upstream of the intercooler 22. The bypass passage 26 is provided with an electric supercharger 28 and a bypass valve 27 in order from the upstream side. The electric supercharger 28 includes a compressor 28a disposed in the bypass passage 26 and an electric motor 28b that drives the compressor 28a. The electric supercharger 28 using the electric motor 28b as a drive source is more responsive than the turbochargers 41 and 42 using exhaust gas as the drive source, and is not easily affected by the operating state of the engine body 2. Therefore, for example, when accelerating in a low rotation range, the turbochargers 41 and 42 are driven together with the turbochargers 41 and 42 to compensate for turbo lag (supercharging delay).

  An upstream portion of the exhaust passage 30 adjacent to the engine body 2 is an exhaust manifold including an independent passage branched so as to communicate with the exhaust port 16 of each cylinder 10a and a collecting portion where the independent passages gather. ing. At the downstream side of the exhaust manifold in the exhaust passage 30, the turbines 42b and 41b of the second turbocharger 42 and the first turbocharger 41 and the harmful components in the exhaust gas are purified in order from the upstream side. An exhaust purification device 31 is provided, and a silencer 32 is provided for reducing exhaust noise.

  The exhaust purification device 31 includes an oxidation catalyst 31a having a function of oxidizing CO and HC in exhaust gas and a DPF 31b having a function of collecting PM (soot) in the exhaust gas.

  Between the intake passage 20 and the exhaust passage 30, an EGR passage 45 for returning a part of the exhaust gas to the intake passage 20 is provided. That is, the intake manifold 21 and the exhaust passage 30 between the exhaust manifold and the turbine 42 b of the second turbocharger 42 are connected to each other via the EGR passage 45. The EGR passage 45 is provided with an openable / closable EGR valve 46 for adjusting the recirculation amount of the exhaust gas to the intake passage 20 and an EGR cooler 47 for cooling the exhaust gas with engine cooling water. The EGR passage 45 is provided with a bypass passage 48 that bypasses the EGR valve 46 and the EGR cooler 47. The bypass passage 48 is provided with a bypass valve 49 that can be opened and closed, and the flow rate of the exhaust gas passing through the EGR cooler 47 is adjusted by controlling the bypass valve 49 and the EGR valve 46. Then, the temperature of the exhaust gas recirculated to the intake passage 20 is adjusted.

(Specific configuration of intake air cooling system)
Next, a specific structure of the intake air cooling device according to the present invention will be described.

  FIG. 2 is a perspective view of the engine 1 as viewed from the intake side, and FIG. 3 is a plan view of the engine 1. The directions used in the following description are based on the engine body 2 unless otherwise specified. Specifically, the cylinder row direction is referred to as the front-rear direction, and the direction orthogonal thereto is referred to as the width direction. As described above, the engine body 2 is placed vertically in the engine room, and therefore, the front and rear coincide with the front and rear of the vehicle, and the left and right coincide with the left and right of the vehicle.

  2 and 3, reference numeral 3 denotes a transmission, which is assembled to the rear end portion of the engine body 2. 2 and 3, the EGR passage 45 and the bypass passage 48 are not shown for convenience.

  The engine body 2 has a left-side intake and right-side exhaust configuration in which an intake port 15 is opened on the left side and an exhaust port 16 is opened on the right side. Therefore, the exhaust manifold, the turbochargers 41 and 42, the exhaust purification device 31 and the like are disposed on the right side surface of the engine body 2, that is, the side surface on the exhaust side. On the other hand, an intake manifold 21, an intercooler 22, an electric supercharger 28, and the like are disposed on the left side surface of the engine body 2, that is, the side surface on the intake side. Specifically, an intake manifold 21 is fixed to the side surface 11 a on the intake side of the cylinder head 11, an intercooler 22 is provided integrally with the intake manifold 21, and an electric supercharger is provided below the intake manifold 21 and the intercooler 22. 28 is arranged. The main intake passage 23 extends upward from the position of the second turbocharger 42 along the right side surface of the engine body 2 and is connected to the upper portion of the intercooler 22 via the upper rear end portion of the engine body 2. ing. In addition, a bypass passage 26 branches off from the main intake passage 23 at the top of the engine body 2. Of the bypass passage 26, an upstream portion 26 a upstream of the electric supercharger 28 extends downward from the upper portion of the engine body 2 along the left side surface thereof, and forwards substantially perpendicularly along the side surface of the cylinder block 10. It is bent and connected to the electric supercharger 28. On the other hand, in the bypass passage 26, a downstream portion 26 b downstream of the electric supercharger 28 extends along the left side surface of the engine body 2 from the position of the bypass valve 27 provided integrally with the electric supercharger 28. It extends rearward, bends behind the intercooler 22 and extends upward, and is joined to the main intake passage 23 at a position between the intercooler 22 and the throttle valve 25.

  4 is a front view of the engine 1 showing the intake manifold 21 and the intercooler 22, FIG. 5 is an assembled perspective view of the intake manifold 21 and the intercooler 22, and FIG. 6 is an intake manifold 21 and the intercooler 22. FIG. FIG. 7 is a sectional view of the intake manifold 21 (sectional view taken along line VII-VII in FIG. 6).

  As shown in these drawings, the intake manifold 21 is fastened to a side surface 11a on the intake side of the cylinder head 11 and extends substantially horizontally in the width direction (a direction orthogonal to the cylinder row direction), and the manifold main body 21a. A cooler constituent part 21b (referred to as a second cooler constituent part 21b) that is connected to the upstream end part of 21a and constitutes the lower end part of the intercooler 22.

  The manifold body 21a has a shape extending in the front-rear direction along the side surface 11a, and has a downstream end portion 50 in which a plurality of independent passages 51 communicating with the intake ports 15 are formed, and an upstream side thereof. And a surge tank portion 52 in which a collecting portion where the independent passages 51 are gathered is formed. Note that the independent passage 51 has any configuration in which one independent passage 51 is provided for a plurality of intake ports 15 in addition to a mode in which one independent passage 51 is provided for one intake port 15. It may be.

  The second cooler constituting portion 21b has a rectangular shape in plan view, and is connected to the surge tank portion 52 at the central portion in the front-rear direction of the manifold body 21a. In this example, the surge tank portion 52 and the second cooler constituting portion 21b are integrally formed of the same metal material or resin material, and the downstream end portion 50 formed separately from this is formed in the surge tank portion 52. The intake manifold 21 is configured by being joined.

  The second cooler constituting portion 21b includes a concave portion 56 having a rectangular shape in plan view that opens upward. As shown in FIG. 7, the inside of the concave portion 56 communicates with the collective portion of the surge tank portion 52. The inner bottom surface 56 a of the concave portion 56 is inclined downwardly from the outer side in the width direction of the engine body 2 toward the inner side (from the left side to the right side), and is continuously connected to the inner bottom surface of the collective portion of the surge tank portion 52. .

  As shown in FIG. 4, the intercooler 22 includes a first cooler component 22 a that is assembled to the upper portion of the second cooler component 21 b of the intake manifold 21, and includes these first and second cooler components 22 a, 21b.

  The first cooler constituting part 22a includes a cooling core 60 having a rectangular shape in plan view, and a ceiling cover 64 having a trapezoidal cross section that is fixed to the top and bulges upward, and an inlet provided in the ceiling cover 64 The main intake passage 23 is connected to a port 64a through a throttle valve 25.

  Although not shown in detail, the cooling core 60 includes a housing 62 having a rectangular cross section that opens in the vertical direction, a plurality of cooling plates arranged at equal intervals in the front-rear direction inside the housing 62, and each cooling plate. This unit is integrally provided with a water supply / drainage pipe 63 connected to the formed water channel. An inlet port 63a and an outlet port 63b of the water supply / drainage pipe 63 are provided on the front side surface of the housing 62, and low-temperature cooling water (one of the refrigerants of the present invention) radiated by a radiator (not shown) is provided at the inlet port. While being introduced from 63a, it is led out from the outlet port 63b via each cooling plate. In other words, the intake air is cooled by exchanging heat with the cooling water by passing through the gap between the cooling plates adjacent to the cooling core 60 from the upper side to the lower side.

  The first cooler component 22a is disposed on the upper portion of the second cooler component 21b of the intake manifold 21, and is fixed to the second cooler component 21b with a bolt and nut. Specifically, a fastening flange portion 62a formed at the lower end portion of the housing 62 and a fastening flange portion 58 formed around the concave portion 56 of the second cooler constituting portion 21b are vertically overlapped. The flange portions 62a and 58 are fastened to each other with bolts and nuts (not shown), so that the first cooler component 22a is fixed to the second cooler component 21b. And the 1st cooler structure part 22a and the 2nd cooler structure part 21b are fastened in this way, These cooler structure parts 22a and 21b cooperate, and the intercooler 22 is comprised. In other words, the second cooler constituting portion 21b has a function as an outlet port that guides the manifold body 21a while the intake air that has passed through the gap between adjacent cooling plates of the cooling core 60 is merged.

  As shown in FIGS. 5 to 7, a fixed portion 54 having a through hole 54 a penetrating in the width direction is integrally formed at the downstream end portion 50 of the intake manifold 21. The intake manifold 21 is fixed to the side surface 11 a of the cylinder head 11 by these fixing portions 54. Specifically, a bolt (not shown) is inserted into the through hole 54a from the outside of each fixing portion 54, and the bolt is screwed and inserted into a screw hole formed in the side surface 11a. Is fastened to the side surface 11a. Thereby, the intake manifold 21 is fixed to the cylinder head 11.

  Two fixing portions 54 are formed on the upper side and three on the lower side of the downstream end portion 50, and these fixing portions 54 are seen in a side view along a direction orthogonal to the cylinder row direction (width direction). That is, when the engine body 2 is viewed from the left side, each is formed so as to be located outside the second cooler constituting portion 21b. Specifically, the lower fixing portions 54 are provided at both end portions and the central portion in the longitudinal direction (front-rear direction) of the downstream end portion 50, and are respectively lower than the lower surface of the second cooler constituting portion 21b. So as to protrude downward from the outer peripheral surface of the downstream end 50. On the other hand, the upper fixing portion 54 is provided at a position between both end portions in the longitudinal direction (front-rear direction) and the center portion of the downstream end portion 50, and is respectively an upper surface of the second cooler constituting portion 21 b, that is, for fastening. It protrudes upward from the outer peripheral surface of the downstream end portion 50 so as to be positioned above the upper surface of the flange portion 58.

  As described above, since all the fixing portions 54 are located outside the second cooler constituting portion 21b in the side view of the engine body 2, the fastening operation of the fixing portions 54 to the cylinder head 11 can be performed without difficulty as described later. It can be done.

(Function and effect of intake air cooling system)
According to the configuration of the intake air cooling apparatus as described above, the second cooler constituting portion 21b constituting the lower end portion of the intercooler 22 is provided in the intake manifold 21, and the first cooler constituting portion 21b has a first portion on the upper side. The intercooler 22 is comprised by the said 1st cooler structure part 22a and the 2nd cooler structure part 21b because the cooler structure part 22a is fixed. For this reason, the position of the intercooler 22 is lower than the intake port 15 and the intercooler 22 is prevented from projecting greatly above the engine body 2 while being directly outside the intake manifold 21 (manifold body 21a). The intercooler 22 can be integrally provided on the non-cylinder head side, whereby low-temperature intake air cooled by the intercooler 22 can be efficiently introduced into the combustion chamber.

  Moreover, in the side view of the engine body 2, each fixing portion 54 of the intake manifold 21 is located outside the second cooler constituting portion 21b, so that the second cooler constituting portion 21b has a second position as shown in FIG. With the 1 cooler component 22a separated, the fixing portion 54 is fastened to the side surface 11a of the cylinder head 11, and then the first cooler component 22a is fixed to the upper part of the second cooler component 21b. The intake manifold 21 and the intercooler 22 can be assembled to the cylinder head 11 without difficulty. Therefore, according to the intake air cooling device described above, the intercooler 22 can be integrally provided immediately outside (on the side opposite to the cylinder head) of the intake manifold 21 (manifold body 21a) without hindering the assembly of the engine 1. In other words, the low-temperature intake air cooled by the intercooler 22 can be efficiently introduced into the combustion chamber.

(Second Embodiment)
FIG. 9 is a front view of the engine showing an intake manifold and an intercooler of the intake air cooling device according to the second embodiment. In addition, since the basic configuration of the intake air cooling device of the second embodiment is common to the intake air cooling device of the first embodiment, in the following description, common parts are denoted by the same reference numerals and description thereof is omitted. The differences will be mainly described in detail.

  In the intake air cooling device of the second embodiment, in addition to the cooling core 60 (referred to as the first cooling core 60) of the first cooler component 22a, the cooling core 70 (second second) is also included in the second cooler component 21b. The structure is provided with a cooling core 70). The second cooling core 70 is connected to a plurality of cooling plates (not shown) arranged inside the concave portion 56 in a state where the second cooling cores are arranged at equal intervals in the front-rear direction, and a flow channel formed in each cooling plate. The water supply / drainage pipe 73 is provided. An inlet port 73a and an outlet port 73b of the water supply / drainage pipe 73 are provided on the front side surface of the second cooler constituting part 21b, and an outlet port passes through each cooling plate while introducing cooling water from the inlet port 73a. 73b. That is, the intake air is cooled by passing through the gap between the cooling plates of the first cooling core 60 from above to below, and further cooled by passing through the gap between the cooling plates of the second cooling core 70 from above. Is done.

  The water supply / drainage pipe 73 of the first cooling core 60 is provided as a part of the engine cooling water circulation system for cooling the engine body 2. In contrast, the second cooling core 70 is a dedicated cooling water circulation system provided separately from the engine cooling water circulation system, that is, a dedicated cooling water circulation system including a dedicated radiator and a dedicated pump. It is connected to the. As a result, cooling water having a temperature lower than that of the first cooling core 60 is circulated in the second cooling core 70.

  According to the intake air cooling device of the second embodiment, the intake air is first cooled by the first cooling core 60 through which the high-temperature cooling water flows, and then the second cooling core 70 through which the low-temperature cooling water flows. Therefore, the cooling is efficiently performed in two stages, and the cooling efficiency of the intake air is increased.

  In addition, in the intake manifold 21 of the second embodiment in which the second cooling core 70 is provided in the second cooler configuration portion 21b, the second cooler configuration portion 21b is correspondingly enlarged in the vertical direction. However, as shown in FIG. 10, by providing each fixing portion 54 so as to be located outside the second cooler constituting portion 21b, as in the first embodiment, when the engine 1 is assembled, the first By separating the cooler component 22a, the intake manifold 21 can be fixed to the side surface 11a of the cylinder head 11 without difficulty.

  By the way, the intake air cooling device of the first and second embodiments described above is an example of a preferred embodiment of an intake air cooling device for an engine according to the present invention, and its specific configuration does not depart from the gist of the present invention. The range can be changed as appropriate.

  For example, in the above-described intake air cooling apparatus, the cooling cores 60 and 70 are configured to circulate cooling water as a refrigerant, but may be configured to cool the intake air by introducing cooling air. Moreover, you may comprise so that intake air may be cooled using cooling water and cooling air together.

  Further, in the intake air cooling device of the second embodiment, the cooling water having a temperature lower than that of the first cooling core 60 is circulated through the second cooling core 70. , 70 may be configured to circulate cooling water having substantially the same temperature. This is the same when cooling air is applied as the refrigerant.

  In the intake air cooling device of the second embodiment, the downstream end portion of the bypass passage 26 (downstream portion 26b) is connected to the main intake passage 23, so that the turbochargers 41 and 42 and the electric supercharger 28 are used. The pressurized intake air is cooled by both the first cooling core 60 and the second cooling core 70. For example, the downstream end of the bypass passage 26 (downstream portion 26b) is connected to the intake manifold. The intake air pressurized by the electric supercharger 28 may be cooled only by the second cooling core 70 by connecting to the second cooler constituting portion 21b. According to such a configuration, for example, it is possible to suppress the intake air pressurized by the electric supercharger 28 from being excessively cooled during acceleration immediately after engine startup. Therefore, the intake air pressurized by the turbochargers 41 and 42 and the electric supercharger 28 can be appropriately cooled according to the intake path (supercharger).

DESCRIPTION OF SYMBOLS 1 Engine 2 Engine main body 10 Cylinder block 11 Cylinder head 11a Side surface 21 Intake manifold 21a Manifold main body 21b 2nd cooler component 22 Intercooler 22a 1st cooler component

Claims (4)

A cylinder head having a side surface in which an intake port is opened, an intake manifold fixed to the side surface and communicating with the intake port, and an intercooler disposed on the side of the cylinder head for cooling the intake air. An intake air cooling device for a multi-cylinder engine with a feeder,
The engine is a turbocharger that pressurizes intake air by energy of exhaust gas, a main intake passage that guides intake air pressurized by the turbocharger, and a passage that branches from the main intake passage, An electric supercharger that pressurizes the intake air by the driving force of the electric motor, and a branch intake passage that guides the intake air pressurized by the electric supercharger,
The intake manifold is fastened to a cylinder head and extends substantially horizontally in a direction orthogonal to the cylinder row direction, and is integrally connected to an upstream end portion of the manifold body in the intake flow direction to constitute a lower end portion of the intercooler. Including a cooler component,
When the cooler component is defined as a second cooler component, the intercooler includes a first cooler component that is assembled to an upper portion of the second cooler component, and the first cooler component and the first cooler component The first cooler component is connected to the main intake passage and is provided with a first cooling core through which the refrigerant circulates, while the second cooler component is provided with the branch intake passage. And a second cooling core through which the refrigerant circulates is provided, and further, there is provided an upwardly opening recess that guides the manifold body while receiving the intake air cooled by each cooling core,
The manifold body has a plurality of fixing portions fastened to the side surface of the cylinder head, and the plurality of fixing portions are more than the second cooler constituting portion in a side view along a direction orthogonal to the cylinder row direction. An intake air cooling device for an engine, characterized in that is also located outside. The intake air cooling device for an engine according to claim 1,
The manifold body has a shape extending in the cylinder row direction, and includes the fixing portions at a plurality of positions in the cylinder row direction,
Among the fixing portions, the fixing portion at a position corresponding to the second cooler constituent portion in the side view is above the upper surface of the second cooler constituent portion or below the lower surface of the second cooler constituent portion. An intake air cooling device for an engine, characterized in that the intake air cooling device is positioned outside of the second cooler component in the side view when extended. The intake air cooling device for an engine according to claim 1 or 2 ,
The intake air cooling device for an engine according to claim 1, wherein the second cooling core circulates a refrigerant having a temperature lower than that of the first cooling core. The intake air cooling device for an engine according to any one of claims 1 to 3 ,
An intake air cooling apparatus for an engine according to claim 1, wherein an inner bottom surface of the recess is inclined downward toward the manifold body in a direction orthogonal to a cylinder row direction.

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