Multi-cylinder engine side structure

Abstract

To provide a side part structure of a multi-cylinder engine capable of suppressing breakage of a fuel pump and the like upon vehicle front collision while certainly fixing an intake manifold to a multi-cylinder engine.SOLUTION: In an engine room of a vehicle, a multi-cylinder engine is vertically mounted. To a left side surface of the multi-cylinder engine, an intake manifold 11, an EGR cooler 12, and a high-pressure fuel pump are attached. The intake manifold 11 is arranged that an end portion of an upper wall formed with a runner inside is attached to a cylinder head of the multi-cylinder engine and projects out to a left side from the attached part. To an upper part of the intake manifold 11, an EGR valve 15 is attached. To the EGR valve 15, an EGR pipe 16 connected by a pipe connecting portion 12b of the EGR cooler 12 is connected from an upper side.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a side structure of a multi-cylinder engine, and more particularly to a side structure of a multi-cylinder engine that is mounted in an engine room in a longitudinal position. [Background technology]

[0002] A multi-cylinder engine mounted in the engine compartment of a vehicle is equipped with various accessories. For example, in a multi-cylinder engine mounted longitudinally with the cylinders aligned along the longitudinal direction of the vehicle, an intake manifold, an EGR device, a fuel pump, and the like are disposed on the sides of the multi-cylinder engine.

[0003] An EGR device is a device that recirculates a portion of exhaust gas from an exhaust port of a cylinder head or the like to an intake manifold. Patent Document 1 discloses a configuration in which an EGR passage that recirculates exhaust gas is connected to an intake duct in an intake manifold. In Patent Document 1, the intake duct is formed so as to extend from a connection portion with a surge tank in a direction away from the surge tank. The EGR passage is connected to the intake duct near the end of the intake duct that is away from the surge tank.

[0004] The configuration of an intake manifold according to the prior art will be described with reference to Figure 6. As shown in Figure 6, an intake manifold 91 has an intake duct 91h, a surge tank 91a, and a runner 91c. The intake manifold 91 according to the prior art is attached to the multi-cylinder engine by an upper attachment portion 91e and a lower attachment portion 91g. The lower attachment portion 91g is formed at the lower end of a lower bracket 91f that is provided so as to hang down from the bottom of the surge tank 91a. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-141406 Summary of the Invention [Problem to be solved by the invention]

[0006] In some vehicles, a layout is adopted in which a fuel pump, fuel lines, etc. are arranged behind the intake manifold in the engine compartment where a multi-cylinder engine is mounted in a longitudinal position. In a vehicle with such a layout, a rearward impact force is applied to the intake manifold in a frontal collision, and it is possible that the lower bracket provided to secure the intake manifold to the multi-cylinder engine may deform or break and move rearward. If the broken lower bracket moves rearward in such a frontal collision, it is possible that the lower bracket or its fragments may collide with the fuel pump, etc.

[0007] However, the intake manifold fixing structures according to the above-described conventional technology do not provide sufficient measures to reliably fix the intake manifold to a multi-cylinder engine while preventing damage to the fuel pump, etc., in the event of a frontal vehicle collision.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a side structure for a multi-cylinder engine that can reliably fix an intake manifold to the multi-cylinder engine while suppressing damage to the fuel pump, etc. in the event of a frontal vehicle collision. [Means for solving the problem]

[0009] A side structure of a multi-cylinder engine according to one aspect of the present invention is a side structure of a multi-cylinder engine that is mounted in an engine room of a vehicle in a longitudinal orientation so that the cylinder array direction is along the front-rear direction of the vehicle, and includes an intake manifold attached to one side of the multi-cylinder engine that is one side of the multi-cylinder engine in the left-right direction of the vehicle, and an EGR cooler that cools exhaust gas discharged from the multi-cylinder engine and recirculated to the intake manifold and is attached to the one side of the multi-cylinder engine at a position adjacent to the intake manifold. a connecting pipe connecting the EGR cooler and the intake manifold; and a fuel pump disposed on one side of the multi-cylinder engine and below the intake manifold, wherein the intake manifold and the EGR cooler are each disposed so as to protrude from the one side surface of the multi-cylinder engine toward the one side, and one end of the connecting pipe is connected to the end of the one side of the EGR cooler and the other end is connected to an upper portion of the intake manifold from above the intake manifold.

[0010] In the side structure for a multi-cylinder engine according to the above aspect, the intake manifold is attached to one side of the multi-cylinder engine and is connected to the EGR cooler via a connecting pipe. The connecting pipe is connected to the upper part of the intake manifold from above, so that the intake manifold is suspended upward by the connecting pipe. That is, in the side structure for a multi-cylinder engine according to the above aspect, the intake manifold is supported at two points: one side of the multi-cylinder engine and the connecting pipe. Therefore, the intake manifold can omit the lower bracket (the lower bracket shown in FIG. 6) that is included in intake manifolds according to conventional techniques.

[0011] Therefore, in the side structure of the multi-cylinder engine according to the above aspect, even if the lower bracket that is included in the intake manifold according to the conventional technology is omitted, the intake manifold can be securely fixed to the multi-cylinder engine, while preventing damage to the fuel pump, etc. in the event of a frontal vehicle collision.

[0012] In the side structure of a multi-cylinder engine according to the above aspect, the EGR cooler may be arranged in front of the intake manifold so as to face the intake manifold in the fore-and-aft direction with a gap therebetween, and the connection point of the intake manifold with the connecting pipe may be arranged further away from the multi-cylinder engine on the one side than the end of the EGR cooler on the one side, and the connecting pipe may extend in the fore-and-aft direction along the cylinder row direction and have a plurality of curved portions along the way.

[0013] In the side structure for a multi-cylinder engine according to the above aspect, the connection point of the intake manifold with the connecting pipe is located at a position farther from the multi-cylinder engine than the one end of the EGR cooler, so that the part of the intake manifold attached to the one side of the multi-cylinder engine and the part connected to the connecting pipe can be spaced apart in the left-right direction of the vehicle. Therefore, even if the intake manifold tends to vibrate around the part of the intake manifold attached to the one side of the multi-cylinder engine as a fulcrum during vehicle travel, the vibration can be suppressed.

[0014] In the side structure for a multi-cylinder engine according to the above aspect, the connecting pipe may be made of a metal material.

[0015] In the side structure for a multi-cylinder engine according to the above aspect, the connecting pipe that is attached so as to suspend the intake manifold from above is made of a metal material, so that the intake manifold can be supported with high rigidity.

[0016] In the side structure for a multi-cylinder engine according to the above aspect, the intake manifold may have a lower end that is a free end with respect to attachment to the multi-cylinder engine.

[0017] In the side structure for a multi-cylinder engine according to the above aspect, the lower end of the intake manifold is a free end, and the lower bracket (the lower bracket shown in FIG. 6) that is included in intake manifolds of conventional technology can be omitted. This prevents the lower bracket from breaking in a frontal collision, causing the lower bracket itself to move backward, and prevents debris from the breakage from interfering with the fuel pump or other components, causing damage to the fuel pump or other components.

[0018] In the side structure for a multi-cylinder engine according to the above aspect, the EGR cooler may have an outer case made of a metal material.

[0019] In the side structure for a multi-cylinder engine according to the above aspect, the exterior case of the EGR cooler is made of a metal material, so the EGR cooler functions favorably as part of the structural material for fixing the intake manifold to the multi-cylinder engine, and therefore the side structure for a multi-cylinder engine according to the above aspect can support the intake manifold with high rigidity.

[0020] In the side structure of the multi-cylinder engine according to the above aspect, the EGR cooler may be arranged in an inclined position such that its height gradually increases from the end attached to the multi-cylinder engine toward the end on the one side.

[0021] In the side structure for a multi-cylinder engine according to the above aspect, the EGR cooler is disposed in the inclined position as described above, which is advantageous in that the connecting pipe can be attached from above the intake manifold.

[0022] The side structure for a multi-cylinder engine according to the above aspect may further include an EGR valve attached to the upper part of the intake manifold, and the connecting pipe may be connected to the upper part of the intake manifold with the EGR valve sandwiched therebetween.

[0023] In the side structure for a multi-cylinder engine according to the above aspect, the EGR valve is attached to the upper part of the intake manifold, which allows for a larger installation area than when the connecting pipe is directly connected to the upper part of the intake manifold. Therefore, in the side structure for a multi-cylinder engine according to the above aspect, the portion supported by the connecting pipe is reliably held even if vibrations are applied to the intake manifold while the vehicle is running, etc.

[0024] In the side structure for a multi-cylinder engine according to the above aspect, the connecting pipe may form part of a recirculation passage for the exhaust gas from the multi-cylinder engine to the intake manifold.

[0025] In the side structure of the multi-cylinder engine according to the above aspect, the connecting pipe is configured as part of the exhaust gas recirculation passage, so there is no need to provide a separate support member to suspend the intake manifold from above, which is advantageous in terms of manufacturing costs and layout. [Effects of the Invention]

[0026] In the side structure for a multi-cylinder engine according to each of the above aspects, the intake manifold can be reliably fixed to the multi-cylinder engine, while preventing damage to the fuel pump and the like in the event of a vehicle frontal collision. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a perspective view showing the structure of the left side portion of the multi-cylinder engine according to the embodiment. [Figure 2] FIG. 2 is a side view showing the intake manifold, high-pressure fuel pump, B-ISG, and the like, which are arranged on the left side of the multi-cylinder engine. [Figure 3] FIG. 2 is a plan view showing an EGR pipe connecting an EGR cooler and an EGR valve. [Figure 4] FIG. 2 is a side view showing the configuration of an EGR pipe. [Figure 5] FIG. 2 is a front view showing the attitude of the EGR cooler. [Figure 6]FIG. 1 is a side view showing an intake manifold according to a conventional technique. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for its essential configuration.

[0029] 1. Overview of the side structure of the multi-cylinder engine 10 The side structure of a multi-cylinder engine 10 according to this embodiment will be outlined with reference to FIGS. 1 and 2. FIG.

[0030] As shown in Figures 1 and 2, a multi-cylinder engine 10 is mounted in the engine room of a vehicle 1. The multi-cylinder engine 10 is mounted in the engine room in a longitudinal position with its cylinder axis direction aligned with the front-to-rear direction of the vehicle 1. The multi-cylinder engine 10 has a mount bracket 19 at its bottom. The multi-cylinder engine 10 is mounted in the engine room by being fixed between the mount bracket 19 and the body of the vehicle 1 via an engine mount (arrow A).

[0031] Arranged to the left of the multi-cylinder engine 10 (one side in the left-right direction of the vehicle 1) are an intake manifold 11, an EGR cooler 12, a B-ISG (Belt-Driven Integrated Starter-Generator) 13, an A / C compressor 14, a starter motor 18, and a high-pressure fuel pump 20. The intake manifold 11 has an end of its upper wall (a wall portion having a runner formed inside) attached to a cylinder head 10a of the multi-cylinder engine 10, and mixes fresh air taken in via an air cleaner with recirculated exhaust gas and introduces the mixed air into the intake port.

[0032] The EGR cooler 12 is attached to the cylinder head 10a of the multi-cylinder engine 10, and is disposed in a portion of the vehicle 1 toward the front of the intake manifold 11. The EGR cooler 12 is provided in a passage (EGR passage) that recirculates a portion of the exhaust gas discharged from the multi-cylinder engine 10 back to the intake manifold 11, and cools the exhaust gas. An EGR pipe 16, which is part of the EGR passage, is attached to the EGR cooler 12. The other end of the EGR pipe 16 is connected to an EGR valve 15 attached to the top of the intake manifold 11. In this embodiment, the exterior case of the EGR cooler 12 and the EGR pipe 16 are made of metal.

[0033] The EGR valve 15 is a valve that adjusts the flow rate of exhaust gas recirculated to the intake manifold 11. The exhaust gas that passes through the EGR valve 15 passes through a passage formed in the intake manifold 11 and is introduced into the interior of the intake manifold 11. The EGR valve 15 is attached to the upper part of the intake manifold 11. The area of ​​the attachment portion of the EGR valve 15 to the intake manifold 11 is set to be larger than the cross-sectional area of ​​the EGR pipe 16.

[0034] A throttle valve 17 is joined to the end of the intake air introduction passage in the intake manifold 11, and fresh air taken in via the air cleaner passes through the throttle valve 17 and is introduced into the intake manifold 11.

[0035] The B-ISG 13 is an accessory disposed to the left of the multi-cylinder engine 10 (on one side in the left-right direction of the vehicle 1) and forward of the high-pressure fuel pump 20. The front part of the B-ISG 13 is located below the EGR cooler 12, and the part further rearward is disposed so as to be located below the surge tank 11a in the intake manifold 11. The B-ISG 13 is a belt-driven ISG and is an alternator (i.e., a power generating device) that also functions as a motor.

[0036] The A / C compressor 14 is disposed below the B-ISG 13, extending rearward along the left side of the multi-cylinder engine 10. The A / C compressor 14 is disposed in the refrigerant circulation path of the air conditioner that cools the interior of the vehicle, and compresses and liquefies the refrigerant vaporized by the evaporator.

[0037] As shown in Fig. 2, high-pressure fuel pump 20 is disposed below the rear portion of intake manifold 11. High-pressure fuel pump 20 pressurizes fuel supplied from a fuel tank and supplies the fuel to injectors attached to each cylinder of multi-cylinder engine 10. Fuel pipes 22 leading to the fuel tank and the injectors are connected to high-pressure fuel pump 20.

[0038] 2, the high-pressure fuel pump 20 is covered by a cover 21 between the surge tank 11a of the intake manifold 11 and on the front side in the longitudinal direction of the vehicle 1. The cover 21 is disposed above and in front of the high-pressure fuel pump 20 with a gap therebetween. By attaching the cover 21, the high-pressure fuel pump 20 is protected from direct interference with the surge tank 11a of the intake manifold 11 and from objects moving from the front to the rear.

[0039] Here, in the side structure of the multi-cylinder engine 10 according to this embodiment, as shown in the portion indicated by arrow B in Figure 2, the lower end portion (surge tank lower end portion 11b) of the surge tank 11a of the intake manifold 11 is not attached to the cylinder block of the multi-cylinder engine 10 or the like, and is a free end with respect to attachment of the intake manifold 11 to the multi-cylinder engine 10.

[0040] 2. Mounting of intake manifold 11 to multi-cylinder engine 10 The manner in which the intake manifold 11 is attached to the multi-cylinder engine 10 will be described with reference to FIGS.

[0041] As shown in Fig. 3, the intake manifold 11 has each end (engine-side mounting portion 11d) of an upper wall in which a plurality of runners are formed attached to the cylinder head 10a of the multi-cylinder engine 10. As shown in Figs. 3 and 5, the intake manifold 11 is disposed so as to protrude leftward from the engine-side mounting portion 11d.

[0042] 3 and 5, the EGR cooler 12 is disposed so as to face the intake manifold 11 with a gap therebetween in front of it. One end (engine-side mounting portion 12a) of the EGR cooler 12 is attached to the cylinder head 10a of the multi-cylinder engine 10. The EGR cooler 12 is also disposed so as to protrude leftward from the engine-side mounting portion 12a. One end (pipe connection portion 12b) of the EGR cooler 12 that is spaced leftward from the multi-cylinder engine 10 is connected to one end (cooler-side mounting portion 16a) of an EGR pipe (connection pipe) 16. In this embodiment, the pipe connection portion 12b of the EGR cooler 12 corresponds to "one end portion."

[0043] As shown in FIG. 3, the pipe connection portion 12b of the EGR cooler 12 is disposed at a portion of the intake manifold 11 closer to the multi-cylinder engine 10 than the portion where the EGR valve 15 is attached.

[0044] As shown in FIG. 4, the pipe connection portion 12b of the EGR cooler 12 is disposed at a position lower than the upper end surface of the EGR valve 15 (the surface to which the EGR pipe 16 is connected) by H1.

[0045] As shown in FIG. 5, the EGR cooler 12 is disposed in an inclined position such that the engine-side mounting portion 12a is positioned lower than the pipe connection portion 12b by H2.

[0046] 4, the EGR pipe 16 extends in the front-rear direction along the cylinder row direction of the multi-cylinder engine 10, and has two curved portions 16c, 16d along the way. As described above, in this embodiment, the EGR pipe 16 is made of a metal material, so that its shape is maintained even when vibrations are applied due to the operation of the multi-cylinder engine 10. The valve-side mounting portion 16b of the EGR pipe 16 is connected to the EGR valve 15 from above, as shown by arrow C.

[0047] 3, the valve-side mounting portion 16b of the EGR pipe 16 is disposed at a location spaced W1 to the left of the multi-cylinder engine 10 from the cooler-side mounting portion 16a. In addition, the valve-side mounting portion 16b of the EGR pipe 16 is disposed at a location spaced W2 to the left of the engine-side mounting portion 11d to the multi-cylinder engine 10.

[0048] 3.Effects In the side structure of the multi-cylinder engine 10 according to this embodiment, the intake manifold 11 is attached to the left side surface of the multi-cylinder engine 10 at an engine-side attachment portion 11d, and is connected to the EGR cooler 12 via an EGR pipe 16 connected to the upper portion. The EGR pipe 16 is connected to the upper portion of the intake manifold 11 from above, as indicated by arrow C in FIG. 4, so that the intake manifold 11 is suspended from above by the EGR pipe 16. That is, the intake manifold 11 is supported at two points: the engine-side attachment portion 11d attached to one side surface (cylinder head 10a) of the multi-cylinder engine 10, and the point where the EGR pipe 16 is connected. Therefore, the intake manifold 11 can be attached to the multi-cylinder engine 10 with high rigidity even if the lower bracket 91f of the intake manifold 91 of the prior art is omitted.

[0049] Therefore, in the side structure of the multi-cylinder engine 10 according to this embodiment, even if the lower bracket 91f of the intake manifold 91 of the conventional technology is omitted, the intake manifold 11 can be reliably supported for the multi-cylinder engine 10, and damage to the fuel pump 20, fuel pipe 22, etc. can be suppressed in the event of a frontal vehicle collision.

[0050] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the connection point of the intake manifold 11 with the EGR pipe 16 (the point where the EGR valve 15 is attached) is located at a position spaced apart by W1 to the left of the multi-cylinder engine 10 from the pipe connection point (one end) 12b of the EGR cooler 12, so that the engine-side attachment part 11d and the point where the EGR pipe 16 is connected can be spaced apart in the left-right direction (vehicle width direction) of the vehicle 1. Therefore, even when the intake manifold 11 tends to vibrate around the engine-side attachment part 11d as a fulcrum while the vehicle 1 is running, the vibration can be kept small.

[0051] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the EGR pipe 16, which is connected to suspend the upper part of the intake manifold 11 from above, as shown by arrow C in FIG. 4, is made of a metal material, and therefore the intake manifold 11 can be supported with high rigidity.

[0052] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the lower end (surge tank lower end 11b) of the surge tank 11a in the intake manifold 11 is a free end, and the intake manifold 11 can be securely attached to the multi-cylinder engine 10 even if the lower bracket 91f of the intake manifold 91 of the prior art is omitted. Therefore, by omitting the lower bracket 91f, it is possible to prevent the lower bracket 91f from being damaged in a frontal vehicle collision, causing the lower bracket 91f itself to move backward, or to prevent fragments of the damaged lower bracket 91f from interfering with the fuel pump 20, fuel pipe 22, etc., causing damage to the fuel pump 20, fuel pipe 22, etc.

[0053] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the exterior case of the EGR cooler 12 is formed of a metal material, so the EGR cooler 12 functions as part of the structural material for fixing the intake manifold 11 to the multi-cylinder engine 10. Therefore, the side structure of the multi-cylinder engine 10 can support the intake manifold 11 with high rigidity.

[0054] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the EGR cooler 12 is disposed in an inclined position as shown in FIG. 5, which is advantageous for connecting the EGR pipe 16 from above the intake manifold 11.

[0055] Furthermore, in the side structure for multi-cylinder engine 10 according to this embodiment, EGR valve 15 is connected to the upper part of intake manifold 11, which allows for a larger area for connection compared to when EGR pipe 16 is directly connected to the upper part of intake manifold 11. Therefore, in the side structure for multi-cylinder engine 10, the portion supported by EGR pipe 16 is reliably held even if vibrations are applied to intake manifold 11 while vehicle 1 is traveling, for example.

[0056] Furthermore, in the side structure of the multi-cylinder engine 10 according to this embodiment, the EGR pipe 16, which constitutes part of the EGR passage, is used as part of the structural material for suspending the intake manifold 11 from above, so there is no need to provide a separate member for supporting the intake manifold 11, which is advantageous in terms of manufacturing costs and layout.

[0057] As described above, the side structure of the multi-cylinder engine 10 according to this embodiment can reliably fix the intake manifold 11 to the multi-cylinder engine 10 while suppressing damage to the fuel pump 20, fuel pipe 22, etc. in the event of a vehicle frontal collision.

[0058] [Variations] In the above embodiment, the intake manifold 11, the EGR cooler 12, the high-pressure fuel pump 20, etc. are arranged on the left side of the multi-cylinder engine 10, but in the present invention, it is also possible to arrange the intake manifold, the EGR cooler, the high-pressure fuel pump, etc. on the right side of the multi-cylinder engine.

[0059] Although the number of cylinders in the multi-cylinder engine 10 has not been specifically mentioned above, the same effects as those described above can be obtained by adopting the same configuration as in the above embodiment for an engine with two or more cylinders.

[0060] In the above embodiment, a direct injection engine is assumed as the multi-cylinder engine 10, and a high-pressure fuel pump 20 is provided as a fuel pump. However, the present invention can also employ a multi-cylinder engine that is not a direct injection engine, and a fuel pump that is not a high-pressure fuel pump.

[0061] In the above embodiment, a vehicle 1 equipped with a so-called mild hybrid system was used as an example, but in the present invention, it is also possible to not have a mild hybrid system and to simply place an alternator in place of the B-ISG13 in the above embodiment.

[0062] Furthermore, in the present invention, when a hybrid system is provided, it is also possible to adopt a configuration that does not include a power generation device such as an alternator or B-ISG.

[0063] In the above embodiment, the exterior case of the EGR cooler 12 and the EGR pipe 16 are made of metal, but the present invention does not limit the materials used for the exterior case of the EGR cooler and the EGR pipe. However, the EGR pipe must be able to support the intake manifold by suspending it from above, so it must be made of a material that can withstand this.

[0064] In the above embodiment, the EGR valve 15 is attached to the top of the intake manifold 11, and the valve-side attachment portion 16b of the EGR pipe 16 is attached to the EGR valve 15. However, in the present invention, it is also possible to attach the other end of the EGR pipe directly to the top of the intake manifold.

[0065] In the above embodiment, the EGR pipe 16 has two curved portions 16c, 16d, but the present invention can also employ an EGR pipe having three or more curved portions or an EGR pipe having no curved portions.

[0066] In the above embodiment, the EGR pipe 16 is attached to the intake manifold 11 only at the valve-side attachment portion 16b, but the present invention can also employ a configuration in which the EGR pipe is attached to the upper portion (top surface) of the intake manifold at multiple locations. For example, a midpoint of the EGR pipe may be attached to the top surface of the intake manifold using a metal fitting or the like.

[0067] In the above embodiment, a configuration in which the cover 21 is attached to cover the front and top of the high-pressure fuel pump 20 is used as an example, but in the present invention, a cover that covers the fuel pump is not an essential configuration. [Explanation of symbols]

[0068] 1 vehicle 10 Multi-cylinder engine 11 Intake manifold 11b Lower end of surge tank 11d Engine side mounting part 12 EGR cooler 12a Engine side mounting part 15 EGR valve 16 EGR pipe (connecting pipe) 16a Cooler side mounting part 16b Manifold side mounting part 20 High-pressure fuel pump (fuel pump) 22 Fuel pipe

Claims

1. A side structure of a multi-cylinder engine mounted in an engine room of a vehicle in a longitudinal orientation with the cylinder rows aligned along the front-rear direction of the vehicle, an intake manifold attached to one side surface of the multi-cylinder engine that is one side surface in the left-right direction of the vehicle; an EGR cooler that cools exhaust gas discharged from the multi-cylinder engine and recirculated to the intake manifold, and that is attached to the one side surface of the multi-cylinder engine at a position adjacent to the intake manifold; a connecting pipe connecting the EGR cooler and the intake manifold; a fuel pump disposed on the one side of the multi-cylinder engine and below the intake manifold; Equipped with the intake manifold and the EGR cooler are each disposed so as to protrude from the one side surface of the multi-cylinder engine toward the one side, One end of the connecting pipe is connected to the one end of the EGR cooler, and the other end is connected to an upper portion of the intake manifold from above the intake manifold. Side structure of a multi-cylinder engine.

2. 2. The side structure of a multi-cylinder engine according to claim 1, the EGR cooler is disposed in front of the intake manifold so as to face the intake manifold in the front-rear direction with a gap therebetween, a connection point of the intake manifold with the connecting pipe is disposed farther from the multi-cylinder engine on the one side than an end of the EGR cooler on the one side, The connecting pipe extends in the front-rear direction along the cylinder row direction and has a plurality of curved portions along the way. Side structure of a multi-cylinder engine.

3. 3. The side structure of a multi-cylinder engine according to claim 1 or 2, The connecting pipe is made of a metal material. Side structure of a multi-cylinder engine.

4. The side structure of a multi-cylinder engine according to any one of claims 1 to 3, The intake manifold has a lower end which is a free end with respect to attachment to the multi-cylinder engine. Side structure of a multi-cylinder engine.

5. The side structure of a multi-cylinder engine according to any one of claims 1 to 4, The EGR cooler has an outer case made of a metal material. Side structure of a multi-cylinder engine.

6. The side structure of a multi-cylinder engine according to any one of claims 1 to 5, The EGR cooler is disposed in an inclined position such that its height gradually increases from an end portion attached to the multi-cylinder engine toward the end portion on the one side. Side structure of a multi-cylinder engine.

7. The side structure of a multi-cylinder engine according to any one of claims 1 to 6, an EGR valve attached to the upper portion of the intake manifold; The connecting pipe is connected to the upper part of the intake manifold with the EGR valve sandwiched therebetween. Side structure of a multi-cylinder engine.

8. The side structure of a multi-cylinder engine according to any one of claims 1 to 7, The connecting pipe forms a part of a recirculation passage for the exhaust gas from the multi-cylinder engine to the intake manifold. Side structure of a multi-cylinder engine.

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