JP2019065751A - Intake system for vehicular internal combustion engine - Google Patents

Abstract

To provide an intake system for a vehicular internal combustion engine capable of improving vehicle mountability of intercooler piping and suppressing vibration of the intake system when an air outlet portion of an intercooler and an air inlet portion of an intake manifold are communicated by the intercooler piping.SOLUTION: An intake system includes intercooler outlet piping 35 for communicating an air inlet portion 63A and an air outlet portion 34B, and the air inlet portion 63A is opened upwards. The intercooler outlet piping 35 includes: an upstream side pipe portion 64 extended from the air outlet portion 34B to a front part of an intake manifold 27; and a downstream side pipe portion 65 for communicating the upstream side pipe portion 64 with the air inlet portion 63A. The downstream side pipe portion 65 includes: a hose 67 installed on the air inlet portion 63A side; and an intermediate pipe portion 66 installed between the hose 67 and the upstream side pipe portion 64 and having rigidity larger than that of the hose 67. The intermediate pipe portion 66 is fixed to an upper part of the intake manifold 27.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an intake system for a vehicle internal combustion engine.

  Conventionally, as an intake duct structure connected to the upstream end of an intake manifold of an internal combustion engine, an intake duct having an intake port connected to the intake outlet of the intercooler via a pipe is provided, and the intake port of the intake duct is There is known one directed in the same direction as the air outlet of the intercooler (see Patent Document 1).

  This intake duct structure shortens the length of piping as compared with the case where the intake port of the intake duct faces in the opposite direction to the air outlet of the intercooler, and the pressure loss of the intake air flowing from the intercooler into the intake duct It is possible to suppress the increase.

JP, 2017-65608, A

  However, in such a conventional intake duct structure, the length of the intake pipe can be shortened, but the intake inlet of the intake duct and the air outlet of the intercooler are connected by a U-shaped curved pipe There is a need to.

  For this reason, in the case of a vehicle having an engine room with a small space behind the internal combustion engine, it is difficult to install piping. Furthermore, if the middle portion of the pipe is not fixed to the vehicle body, the vibration of the pipe may be increased.

  The present invention has been made focusing on the above circumstances, and when the air outlet of the intercooler and the air inlet of the intake manifold are connected by the intercooler piping, the vehicle mountability of the intercooler can be improved. And, it is an object of the present invention to provide an intake system for a vehicle internal combustion engine capable of suppressing vibration of the intake system.

  According to the present invention, an engine body installed in an engine room so that cylinders are arranged along the longitudinal direction of the vehicle, and an air inlet portion installed at the rear portion attached to the lateral side of the engine body in the vehicle width direction An intake manifold; an intercooler installed in front of the intake manifold and having an air outlet at the rear; and an intercooler pipe that communicates the air inlet of the intake manifold and the air outlet of the intercooler In the intake system of a vehicular internal combustion engine, the air inlet portion is opened upward, and the intercooler pipe extends from the air outlet portion to an upstream side pipe portion extending from the air outlet portion to the front of the intake manifold; And a downstream side pipe portion for connecting the side pipe portion and the air inlet portion, the downstream side pipe portion being a first pipe installed on the air inlet side. And a second downstream side pipe portion which is disposed between the first downstream side pipe portion and the upstream side pipe portion and which is more rigid than the first downstream side pipe portion. The second downstream side pipe portion is fixed to an upper portion of the intake manifold.

  As described above, according to the present invention described above, when the air outlet of the intercooler and the air inlet of the intake manifold are connected by the intercooler piping, the vehicle mounting property of the intercooler piping can be improved, and the vibration of the intake system can be reduced. It can be suppressed.

FIG. 1 is a plan view of a front portion of a vehicle provided with an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. FIG. 2 is a rear view of a front portion of a vehicle provided with an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. FIG. 3 is a right side view of a front portion of a vehicle provided with an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. FIG. 4 is a left side view of a front portion of a vehicle provided with an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. FIG. 5 is an exploded view of an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. FIG. 6 is a plan view of an intermediate pipe portion of an intake system of an internal combustion engine for a vehicle according to an embodiment of the present invention. FIG. 7 is a right side view of the intermediate pipe portion of the intake system of the internal combustion engine for a vehicle according to one embodiment of the present invention.

  In an intake system for an internal combustion engine for a vehicle according to one embodiment of the present invention, an engine body installed in an engine room so that cylinders are arranged along the longitudinal direction of the vehicle, and a vehicle width direction side portion of the engine body And an intercooler installed at the front of the intake manifold and installed at the rear with an air outlet, and an air inlet of the intake manifold and an air outlet of the intercooler. An intake port of an internal combustion engine for a vehicle including an intercooler pipe for connecting the upstream side pipe portion having an air inlet portion opened upward, the intercooler pipe extending from the air outlet portion to a front portion of the intake manifold And a downstream side pipe connecting the upstream side pipe and the air inlet, and the downstream side pipe is a first downstream side pipe installed on the air inlet side. A second downstream side pipe portion installed between the first downstream side pipe portion and the upstream side pipe portion and having a rigidity greater than that of the first downstream side pipe portion; The downstream pipe portion is fixed to the upper portion of the intake manifold.

  Thus, when the air outlet portion of the intercooler and the air inlet portion of the intake manifold are connected by the intercooler pipe, it is possible to improve the vehicle mountability of the intercooler pipe and to suppress the vibration of the intake system.

Hereinafter, an intake system for a vehicle internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings.
1 to 7 are views showing an intake system for a vehicle internal combustion engine according to an embodiment of the present invention. In FIGS. 1 to 7, in the up, down, front, rear, left, and right directions, when the traveling direction of the vehicle is front and the backward direction is rear, the width direction of the vehicle is the left and right direction, and the height direction of the vehicle is the vertical direction.

First, the configuration will be described.
In FIG. 1, a vehicle 1 includes a frame 2 and a body 3. The frame portion 2 includes a pair of side members 5 and 6, a front cross member 7 (see FIG. 4) and a rear cross member 8. The pair of side members 5 and 6 are separated in the width direction of the vehicle 1 (hereinafter simply referred to as the vehicle width direction), and extend in the front-rear direction.

  In FIG. 2, the front cross member 7 extends in the vehicle width direction, and connects the front ends of the side members 5 and 6. The rear cross member 8 extends in the vehicle width direction at the rear of the front cross member 7 and connects the side members 5 and 6.

  In FIG. 1, the body portion 3 includes side fenders 9 and 10, front wheel houses 11 and 12, a rear wall 13 and a hood lock member 14.

  The side fenders 9, 10 are provided outward in the vehicle width direction with respect to the side members 5, 6, and extend in the vertical direction and the longitudinal direction of the vehicle 1.

  The front wheel houses 11, 12 extend from the inside in the vehicle width direction of the side fenders 9, 10 toward the side members 5, 6, and the end portions in the extending direction are fixed to the side members 5, 6. The rear wall 13 extends in the vehicle width direction between the front wheel houses 11 and 12. The hood lock member 14 extends in the vehicle width direction and connects the side fenders 5 and 6.

  A front wheel (not shown) is provided below the front wheel houses 11, 12, and the front wheel houses 11, 12 secure a space for the front wheels to rotate above the front wheels.

  An engine room 21 surrounded by side fenders 9, 10, front wheel houses 11, 12, a rear wall 13 and a hood lock member 14 is formed at the front of the vehicle 1, and the engine room 21 is an internal combustion engine. An engine 22 is installed.

  In any of FIGS. 2 to 4, the engine 22 includes a cylinder block 23, a cylinder head 24, a cylinder head cover 25 and an oil pan 26. The cylinder block 23, the cylinder head 24, the cylinder head cover 25 and the oil pan 26 of this embodiment constitute an engine body 22A.

  The cylinder block 23 is provided with a plurality of cylinders (not shown). A piston (not shown) is accommodated in the cylinder, and the piston reciprocates in the vertical direction with respect to the cylinder. The piston is connected to a crankshaft (not shown) via a connecting rod (not shown), and the reciprocating motion of the piston is converted to rotational motion of the crankshaft via the connecting rod.

  The cylinder head 24 is provided with a plurality of intake ports 24A (see FIG. 5), a plurality of intake valves (not shown) for opening and closing the intake ports 24A, and a plurality of exhaust valves for opening and closing a plurality of exhaust ports and exhaust ports (not shown). ing.

  The engine body 22A is installed in the engine room 21 such that the cylinders are arranged in the front-rear direction.

  An intake manifold 27 is provided on the right side surface of the cylinder head 24 which is a side portion in the vehicle width direction of the engine main body 22A, and an exhaust manifold 28 is provided on the left side surface of the cylinder head 24.

  The intake manifold 27 introduces air (intake air) into the cylinder through the intake port. The exhaust manifold 28 is integrally formed with the cylinder head 24. Exhaust gas burned in the cylinder is discharged to the exhaust manifold 28 through an exhaust port.

  A valve operating chamber (not shown) is formed between the cylinder head 24 and the cylinder head cover 25. The valve operating chamber is provided with an intake camshaft having an intake cam (not shown) and an exhaust camshaft having an exhaust cam. ing.

  The intake cam and the exhaust cam respectively open and close the intake port and the exhaust port by driving the intake valve and the exhaust valve as the intake camshaft and the exhaust camshaft rotate, respectively.

  An air cleaner 29 is provided on the top of the cylinder head cover 25. An intake duct 30 is connected to the upstream side of the air cleaner 29, and the intake duct 30 is connected to the air cleaner 29 via an air cleaner inlet pipe 31.

  The intake duct 30 takes in the air taken into the engine room 21 and then introduces the air into the air cleaner 29 via the air cleaner inlet pipe 31. The air cleaner 29 cleans the air introduced from the air cleaner inlet pipe 31.

  An air cleaner outlet hose 37 is connected to the downstream side of the air cleaner 29. Here, the upstream and downstream mean upstream and downstream with respect to the air flow direction.

  In FIG. 4, the downstream end of the air cleaner outlet hose 37 is connected to the upstream end of the turbo inlet pipe 38, and the turbo inlet pipe 38 is connected to the supercharger 32.

  The supercharger 32 is attached to the left side surface in the vehicle width direction of the cylinder block 23, and the supercharger 32 has a compressor housing 32A and a turbine housing 32B.

  A compressor wheel (not shown) is rotatably mounted on the compressor housing 32A, and the downstream end of the turbo inlet pipe 38 is connected to the compressor housing 32A.

  The downstream end of the exhaust pipe 41 is connected to the turbine housing 32B. A turbine wheel (not shown) is rotatably mounted on the turbine housing 32B, and the turbine wheel rotates integrally with the compressor wheel.

  The upstream end of the exhaust pipe 41 is connected to the cylinder head 24, exhaust gas is discharged to the exhaust pipe 41 through the exhaust manifold 28, and exhaust gas discharged to the exhaust pipe 41 is introduced to the turbine housing 32B. .

  The turbocharger 32 pressurizes the air supplied to the compressor housing 32A by rotation of the turbine wheel by the exhaust pressure and rotation of the compressor wheel as the turbine wheel rotates.

  The upstream end of a turbo outlet pipe 39 is connected to the compressor housing 32A. The upstream end of the intercooler inlet pipe 33 is connected to the downstream end of the turbo outlet pipe 39. The air pressurized by the compressor housing 32A is supplied from the compressor housing 32A to the intercooler inlet pipe 33 via the turbo outlet pipe 39.

  In FIGS. 2 and 3, the downstream end of the intercooler inlet pipe 33 is connected to the air inlet 34 A of the intercooler 34. The intercooler 34 is disposed in front of the intake manifold 27 (see FIG. 1), and an air outlet 34B is disposed in the rear.

  The intercooler 34 cools the air by heat exchange between the air introduced from the intercooler inlet piping 33 and the outside air to increase the density of the air.

  The upstream end of the intercooler outlet pipe 35 is connected to the air outlet 34B of the intercooler 34, and the downstream end of the intercooler outlet pipe 35 is connected to the intake manifold 27 via the throttle body 36 (FIG. 3) reference). The intercooler outlet piping 35 of the present embodiment constitutes the intercooler piping of the present invention.

  A throttle valve (not shown) is accommodated in the throttle body 36, and the throttle valve adjusts the amount of air taken into the intake manifold 27 from the intercooler outlet pipe 35.

  In FIGS. 3 and 5, the intake manifold 27 includes a plurality of branch pipes 61, a surge tank 62 and an inlet pipe 63.

  In each branch pipe 61, a passage formed therein communicates with the intake port 24A to introduce air into the cylinder through the intake port 24A. Since the engine 22 of this embodiment is a three-cylinder engine, three branch pipes 61 are provided according to the number of cylinders.

  The surge tank 62 extends in the front-rear direction, which is the alignment direction of the cylinders. The upstream end of the branch pipe 61 is connected to the surge tank 62, and the surge tank 62 temporarily stores air and distributes and introduces the air into the branch pipe 61.

  The inlet pipe 63 is connected to the rear of the surge tank 62. The inlet pipe 63 is provided with an air inlet portion 63A, and the air inlet portion 63A opens upward. Thus, an air inlet portion 63A is formed at the rear of the intake manifold 27. The throttle body 36 is connected to the air inlet portion 63A on the upstream side of the intake manifold 27 and at the upper part of the intake manifold 27.

  Thus, the intercooler outlet pipe 35 and the throttle body 36 connect the air inlet portion 63A of the intake manifold 27 and the air outlet portion 34B of the intercooler 34.

  Therefore, high-density air pressurized by the supercharger 32 and cooled by the intercooler 34 is introduced into the intake manifold 27 through the intercooler outlet pipe 35 and the throttle body 36.

  The intake manifold 27 introduces air introduced from the intercooler outlet pipe 35 into the inlet pipe 63 through the air inlet portion 63A, and then distributes the air from the surge tank 62 to the branch pipe 61 to introduce it into each cylinder. Thereby, the fuel consumption and the output of the engine 22 can be improved.

  The intercooler outlet piping 35 has an upstream side pipe portion 64 and a downstream side pipe portion 65. The upstream side pipe portion 64 extends from the air outlet 34B of the intercooler 34 toward the intake manifold 27 (see FIG. 3).

  The downstream side pipe portion 65 includes an intermediate pipe portion 66 and a hose 67, and connects the downstream end of the upstream side pipe portion 64 and the air inlet portion 63A of the intake manifold 27. The hose 67 of the present embodiment constitutes a first downstream side pipe portion of the present invention, and the intermediate pipe portion 66 constitutes a second downstream side pipe portion of the present invention.

  The hose 67 is made of a deformable resin, and is disposed on the air inlet portion 63A side with respect to the intermediate pipe portion 66. The middle pipe portion 66 is made of resin, metal or the like which is higher in rigidity than the hose 67, and is installed between the hose 67 and the upstream side pipe portion 64.

  In FIGS. 5 to 7, the fixing pieces 66A, 66B are provided on the side portions of the intermediate pipe portion 66, and the boss portion 66C is provided on the upper portion of the intermediate pipe portion 66. In FIG. 5, a boss 61A is provided on the upper portion of the branch pipe 61, and a boss 62A is provided on the upper portion of the surge tank 62.

  The fixed piece 66A of the intermediate pipe 66 is fastened to the boss 61A of the branch pipe 61 by a bolt 68A, and the fixed piece 66B of the intermediate pipe 66 is fastened to the boss 62A of the surge tank 62 by a bolt 68B. Thus, the intermediate pipe portion 66 is fixed to the upper portion of the intake manifold 27 by being fixed to the upper portion of the branch pipe 61 and the surge tank 62.

  A boss 29A is formed on the side surface of the air cleaner 29. The boss 66C of the intermediate pipe 66 is fastened to the boss 29A by a bolt 68C. Thus, the air cleaner 29 is fixed to the upper portion of the intermediate pipe portion 66. The air cleaner 29 is fastened to the fixing piece 25A and the boss 25B formed on the top of the cylinder head cover 25 by bolts 68D and 68E.

  In FIGS. 5 to 7, a pair of bosses 66 </ b> D and 66 </ b> E is provided on the upper portion of the intermediate pipe 66. In FIG. 5, a detection element 69A provided below the sensor 69 is inserted into the boss 66D. Thus, the detection element 69A can detect the state of air flowing in the middle pipe portion 66.

  A fitting portion 69A provided at a lower portion of the sensor 69 is fitted to the boss portion 66D, and a fixing piece 69B of the sensor 69 is fastened to the boss portion 66E by a bolt 68F.

  Thus, the sensor 69 is fixed to the upper portion of the intermediate pipe portion 66. The sensor 69 includes a sensor that detects the temperature of air flowing through the intermediate pipe portion 66, a sensor that detects a pressure, a sensor that detects an amount of air, and the like, and the type of sensor is not particularly limited. Absent.

  In FIGS. 5 to 7, a boss 66F is provided on the upper portion of the intermediate pipe 66, and an end of negative pressure piping (not shown) is connected to the boss 66F. The negative pressure pipe introduces a negative pressure generated in the intake system to, for example, a brake booster or the like.

  In FIG. 3, the intermediate pipe portion 66 is installed in the intake manifold 27 such that the pipe center axis 66 L on the downstream side is positioned above the throttle body 36. Specifically, the intermediate pipe portion 66 is installed in the intake manifold 27 so as to incline upward from the front side toward the rear side. The fixing piece 66B extends downward from the bottom of the intermediate pipe 66 more than the fixing piece 66A, and makes the intermediate pipe 66 tiltable.

  The hose 67 is connected to the throttle body 36 so as to curve downward from the middle pipe portion 66, and the upstream end and the downstream end of the hose 67 are the middle pipe portion 66 and the throttle body by the clamp members 70A and 70B, respectively. It is linked to 36 and.

  As shown in FIG. 1, a radiator 42 is installed in front of the engine 22 in the engine compartment 21. The radiator 42 is connected to the engine 22 via a cooling water pipe (not shown), and exchanges heat between the cooling water circulating between the engine 22 and the radiator 42 and the outside air.

  As a result, the low temperature cooling water flowing out of the radiator 42 is supplied to the engine 22 and the engine 22 is cooled by the low temperature cooling water. The high temperature cooling water heat-exchanged with the engine 22 flows from the cooling water pipe into the radiator 42 and is cooled by the radiator 42.

  In FIG. 4, radiator supports 43 and 44 are fixed to the front cross member 7 and the rear cross member 8, and the radiator supports 43 and 44 extend upward from the front cross member 7 and the rear cross member 8. There is. The radiator supports 43 and 44 are installed so as to sandwich the radiator 42 in the vehicle width direction.

  In FIG. 2, the engine 22 is elastically connected to the side members 5 and 6 by mounting devices 51 and 55.

  The intake system of this embodiment includes an intake manifold 27 having an air inlet 63A at its rear, an intercooler 34 installed at the front of the intake manifold 27 and an air outlet 34B at its rear, and an air inlet 63A. And an intercooler outlet pipe 35 for communicating the air outlet portion 34B, and the air inlet portion 63A opens upward.

  The intercooler outlet piping 35 includes an upstream side pipe portion 64 extending from the air outlet portion 34B toward the intake manifold 27, and a downstream side pipe portion 65 connecting the downstream end of the upstream side pipe portion 64 and the air inlet portion 63A. Have.

  The downstream side pipe portion 65 includes a hose 67 installed on the air inlet portion 63A side, and an intermediate pipe portion 66 disposed between the hose 67 and the upstream side pipe portion 64 and having a rigidity greater than that of the hose 67. The intermediate pipe portion 66 is fixed to the upper portion of the intake manifold 27.

  Thus, the intermediate pipe portion 66 can be formed in a shape that conforms to the shape of the peripheral member installed around the intermediate pipe portion 66, and can be installed in the narrow space above the intake manifold 27. For this reason, when installing the intercooler outlet piping 35 in the narrow space of the engine room 21 of the side of the engine 22, the mounting property of the intercooler outlet piping 35 with respect to the vehicle 1 can be improved.

  Further, since the intermediate pipe portion 66 is fixed to the upper portion of the intake manifold 27, large vibration in the vertical direction of the intermediate pipe portion 66 can be prevented. Therefore, the intercooler inlet piping 33, the intercooler 34, the intercooler outlet piping 35, and the intake manifold are compared with the case where the downstream side pipe portion 65 extends outward (backward or outward in the width direction of the vehicle) from the intake manifold 27. 27 can be suppressed from vibrating.

  In addition, since the intermediate pipe 66 is disposed at the upper portion of the intake manifold 27, the air outlet 34B of the intercooler 34 and the air inlet 63A of the intake manifold 27 can be communicated in a linear path. Can be shortened. For this reason, it is possible to prevent the pressure loss of the intake air introduced from the intercooler 34 into the intercooler outlet pipe 35 from increasing.

  Further, according to the intake system of the present embodiment, since the intermediate pipe 66 is fixed to both the surge tank 62 and the branch pipe 61, the intermediate pipe 66 can be stably supported on the intake manifold 27. it can. As a result, it is possible to more effectively prevent the intermediate pipe portion 66 from largely vibrating in the vertical direction.

  Further, according to the intake system of the present embodiment, the intake manifold 27 is provided with the inlet pipe 63 in which the air inlet portion 63A opens upward. Furthermore, the intake system has a throttle body 36 attached to the air inlet 63A to introduce air into the inlet pipe 63, and the intermediate pipe 66 is provided with a pipe center axis 66L downstream of the intermediate pipe 66. Is inclined to the rear and is positioned above the throttle body 36.

  In addition to this, the hose 67 is connected to the throttle body 36 so as to curve downward from the intermediate pipe 66. Thereby, the bend of the hose 67 can be made gentle.

  In order to specifically explain the effect, using the intake manifold 27 provided with the inlet pipe 63 with the air inlet 63A opening upward, the pipe center axis 66L on the downstream side of the intermediate pipe 66 is horizontally or rearwardly inclined Compare with.

  In this case, since the downstream end of the intermediate pipe 66 and the upstream end of the throttle body 36 are disposed close to each other in the height direction of the vehicle, the hose 67 is bent upward from the intermediate pipe 66 , It is necessary to bend downward and connect to the throttle body 36. For this reason, the dimension of the hose 67 becomes long and the pressure loss of the air which flows through the intercooler outlet piping 35 increases.

  The middle pipe portion 66 of this embodiment is installed such that the pipe center axis 66L on the downstream side of the middle pipe portion 66 is positioned above the throttle body 36, and the hose 67 curves downward from the middle pipe portion 66. Thus, since the hose is connected to the throttle body 36, bending of the hose 67 can be made gentle.

  As a result, the length of the intercooler outlet pipe 35 can be shortened, and the bending of the hose 67 can be made gentle, and the pressure loss of the air flowing through the intercooler outlet pipe 35 can be prevented from increasing. The resistance of the air flowing through the pipe 35 can be reduced.

  In addition, since the entire length of the hose 67 can be shortened, the downstream side pipe portion 65 can be easily installed in the narrow space above the intake manifold 27, and the vehicle mounting property of the intercooler outlet piping 35 with respect to the vehicle 1 can be more effectively It can improve.

  Further, according to the intake system of the present embodiment, the air cleaner 29 is disposed on the upper portion of the cylinder head cover 25, and the air cleaner 29 is fixed to the upper portion of the intermediate pipe portion 66.

  Thus, in addition to fixing the intermediate pipe portion 66 to the air cleaner 29, the intermediate pipe portion 66 can be vertically supported by the air cleaner 29 and the intake manifold 27. Therefore, the intermediate pipe 66 can be supported more stably by the intake manifold 27 and the air cleaner 29. As a result, it is possible to more effectively prevent the intermediate pipe portion 66 from largely vibrating in the vertical direction.

  In addition, although the downstream side pipe part 65 of a present Example is comprised from the intermediate pipe part 66 and the hose 67 of another body, the downstream side pipe part 65 is comprised from the integral intermediate pipe part 66 and the hose 67 It is also good. In addition, although the hose 67 constituting the first downstream side pipe portion is constituted by one pipe portion, it may be constituted by a pipe portion divided into two or more, and is more rigid than the intermediate pipe portion 66 There may be an integral tube portion having a small rigidity and each having a different rigidity.

  While embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 21 ... Engine room, 22 ... Engine (internal combustion engine), 22A ... Engine main body, 27 ... Intake manifold, 29 ... Air cleaner, 34 ... Intercooler, 34B ... air outlet portion, 35 ... intercooler outlet piping (intercooler piping), 36 ... throttle body, 61 ... branch pipe, 62 ... surge tank, 63 ... inlet pipe, 63A. .... Air inlet part, 64 ... upstream pipe part, 65 ... downstream pipe part, 66 ... middle pipe part (second downstream pipe part), 66 L ... pipe center axis ( Pipe center axis on the downstream side of the second downstream pipe portion, 67 ... hose (first downstream pipe portion)

Claims (4)

An engine body installed in an engine room so that the cylinders are arranged along the longitudinal direction of the vehicle,
An intake manifold mounted on a lateral side of the engine body in the vehicle width direction and having an air inlet at the rear;
An intercooler disposed in front of the intake manifold and having an air outlet at the rear;
An intake system for a vehicle internal combustion engine, comprising: an intercooler pipe connecting the air inlet portion of the intake manifold and the air outlet portion of the intercooler,
The air inlet is open upward,
The intercooler pipe includes an upstream side pipe extending from the air outlet toward the intake manifold, and a downstream side pipe communicating the downstream end of the upstream side pipe and the air inlet.
The downstream side pipe portion is disposed between a first downstream side pipe portion installed on the air inlet side, the first downstream side pipe portion and the upstream side pipe portion, and the first And a second downstream pipe section which is more rigid than the downstream pipe section, and
An intake system for a vehicle internal combustion engine, wherein the second downstream side pipe portion is fixed to an upper portion of the intake manifold. The intake manifold extends along a direction in which the cylinders are arranged, with a plurality of branch pipes supplying air to each of the cylinders, and the upstream ends of the branch pipes are connected to introduce air into the branch pipes. A surge tank, and an inlet pipe connected to a rear portion of the surge tank and having the air inlet portion for introducing air to the surge tank;
The intake system of an internal combustion engine for a vehicle according to claim 1, wherein the second downstream side pipe portion is fixed to the surge tank and the branch pipe. A throttle body mounted at the air inlet to introduce air into the inlet pipe;
The second downstream side pipe portion is installed such that the pipe center axis on the downstream side of the second downstream side pipe portion is positioned above the throttle body,
The internal combustion engine according to claim 2, wherein the first downstream side pipe portion is connected to the throttle body so as to curve downward from the second downstream side pipe portion. Inspiratory device. An air cleaner for introducing air to the intercooler is disposed at an upper portion of the engine body,
The air cleaner according to any one of claims 1 to 3, wherein the air cleaner is fixed to an upper portion of the second downstream side pipe portion.

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