WO2015152374A1

WO2015152374A1 - Intake device for supercharger-equipped internal combustion engine

Info

Publication number: WO2015152374A1
Application number: PCT/JP2015/060474
Authority: WO
Inventors: 聖人藤阪
Original assignee: スズキ株式会社
Priority date: 2014-04-04
Filing date: 2015-04-02
Publication date: 2015-10-08
Also published as: DE112015001679B4; CN105765208B; JP6331603B2; DE112015001679T5; JP2015200184A; CN105765208A

Abstract

An intercooler outlet pipe (16) in this invention comprises a wide section (16A) that has a large inside diameter and a narrow section (16B) that has a smaller inside diameter than the wide section (16A). The wide section (16A) extends from the lengthwise middle (C) of the intercooler outlet pipe (16) to a downstream end (16b) thereof that is connected to an intake-air introduction tube. Said intake-air introduction tube extends from a surge tank towards the bottom of the vehicle (1), and in the height direction of the vehicle (1), extends to the bottom of an alternator (21). From an air-outlet tube section (19a), the intercooler outlet pipe (16) passes underneath a mount device (7) and the alternator (21) to connect to the intake-air introduction tube.

Description

Intake device for an internal combustion engine with a supercharger

The present invention relates to an intake device for an internal combustion engine with a supercharger, and more particularly to an intake device for an internal combustion engine with a supercharger provided with an intercooler that cools air introduced from the supercharger into the internal combustion engine.

Generally, in an internal combustion engine of a vehicle such as an automobile, an intercooler that cools air that has been supercharged by a compressor of a supercharger and increased in temperature is provided. In this intercooler, the charging efficiency of the internal combustion engine can be increased by lowering the temperature of the air through heat exchange with the outside air passing through the core portion.

As conventional internal combustion engines equipped with this type of intercooler, those described in Patent Document 1 and Patent Document 2 are known. In Patent Document 1 and Patent Document 2, an intercooler is installed in front of an internal combustion engine mounted in an engine room, and an intake manifold is installed behind the internal combustion engine and above the internal combustion engine. The intercooler and the intake manifold are connected by an intercooler outlet pipe having the same inner diameter along the length direction.

The intercooler outlet pipe described in Patent Document 1 is directed from the upper tank of the intercooler to the upper side of the internal combustion engine along the other end in the vehicle width direction opposite to the one end in the vehicle width direction on the transmission side of the internal combustion engine. After extending obliquely upward of the vehicle, it is connected to the intake manifold so as to cross the upper part of the internal combustion engine from above the rear part of the internal combustion engine.
An air cleaner inlet pipe is installed on the front side in the front-rear direction of the vehicle with respect to the intercooler outlet pipe so as to overlap the front-rear direction of the vehicle.

The intercooler outlet pipe (third intake pipe) described in Patent Document 2 is formed to have the same inner diameter along the length direction, and the intercooler outlet pipe is connected to the internal combustion engine from the lower tank of the intercooler. It extends diagonally above the vehicle toward the upper side of the internal combustion engine along the other end in the vehicle width direction opposite to the one end in the vehicle width direction on the transmission side.

JP 2011-21571 A JP 2009-227132 A

However, in the devices described in Patent Documents 1 and 2, when an auxiliary machine such as an alternator that generates heat is installed at the other end in the vehicle width direction, the intercooler outlet pipe is located above the auxiliary machine. Will be located.

For this reason, if the heat generated from the auxiliary machine rises and stays above the auxiliary machine, the intercooler outlet pipe is exposed to this heat, and the air passing through the intercooler outlet pipe may be heated. .

Also, in the device described in Patent Document 1, an air cleaner outlet pipe is installed on the front side in the front-rear direction of the vehicle with respect to the intercooler outlet pipe so as to overlap in the front-rear direction of the vehicle. For this reason, the traveling wind from the front of the vehicle is blocked by the air cleaner outlet pipe, making it difficult to hit the intercooler outlet pipe. Therefore, the arrangement structure described in Patent Document 1 cannot efficiently cool the air flowing through the intercooler outlet pipe.

As a result, in the arrangement structure described in Patent Document 1, the air cooled by the intercooler cannot be further cooled by the intercooler outlet pipe, and the cooled air cannot be introduced into the internal combustion engine via the intake manifold. Therefore, with the arrangement structure described in Patent Document 1, the charging efficiency of the internal combustion engine cannot be increased, and it becomes difficult to increase the output performance of the internal combustion engine.

Further, since the intercooler outlet pipes described in Patent Documents 1 and 2 are formed to have the same inner diameter, for example, when the intercooler outlet pipe is applied to a two-cylinder engine, intake pulsation is optimized. Therefore, the intake resistance increases.

Specifically, in a two-cylinder engine or the like, when the piston phase moves up and down at 360 °, the intake port opening and closing timing by the intake valve is the same, so-called intermittent intake is performed, and intake pulsation does not occur. And a pressure wave is generated due to the intake pulsation.

If the inner diameter of the intercooler outlet piping is the same, the natural frequency of the intercooler outlet piping will be low, and the resonance between the intercooler outlet piping and the reflected wave that bounces off the intake valve will cause normal engine rotation ( For example, at 3000 to 4500 rpm, the intake resistance of the intercooler outlet pipe increases. For this reason, the amount of air taken into the engine is reduced, and the air charging efficiency in the internal combustion engine is reduced. As a result, the engine output may be reduced.

The present invention has been made paying attention to the above-described problems, and can prevent the air flowing through the intercooler outlet pipe from being heated, thereby improving the output performance of the internal combustion engine, An object of the present invention is to provide an intake device for an internal combustion engine with a supercharger that can prevent a reduction in engine output performance.

A first aspect of the present invention is an intake device attached to an internal combustion engine having a supercharger, the surge tank being attached to a rear portion in the front-rear direction of the internal combustion engine, and the intake air introduction provided in the upstream portion of the surge tank. An intake manifold having a pipe, an intercooler which is installed in front of the internal combustion engine and has an air outlet pipe portion and is connected to the supercharger via an intercooler linelet pipe, and an internal combustion air from the air outlet pipe portion of the intercooler And an intercooler outlet pipe that extends along the vehicle width direction end of the engine and is connected to the intake air inlet pipe. The intercooler outlet pipe has a large diameter portion and a large diameter that have a large inner diameter of the intercooler outlet pipe. A small-diameter portion whose inner diameter is smaller than the inner diameter portion, and the large-diameter portion is connected to the intake inlet pipe from the center in the longitudinal direction of the intercooler outlet pipe. And a one formed between to the downstream end to be continued.

As a second aspect of the present invention, an end portion in the vehicle width direction of the internal combustion engine is supported by the vehicle body via the mount device, and at the rear portion in the front-rear direction of the internal combustion engine and below the surge tank during operation. An auxiliary machine that generates heat is attached, and the intake pipe is extended from the surge tank to the lower part of the vehicle, and at least the lower part of the auxiliary machine is extended in the height direction of the vehicle, and the air outlet pipe is extended in the height direction of the vehicle. The upper part is installed above the mounting device, and the auxiliary equipment is installed below the mounting device, and the intercooler outlet pipe is connected from the air outlet pipe to the intake inlet pipe below the mounting device and below the auxiliary equipment. The large-diameter portion passes at the lower side of the mounting device and from the rear portion of the vehicle in the front-rear direction of the mounting device to the lower side of the auxiliary equipment and at least separates downward from the intake pipe. It may be formed between the up position.

As a 3rd aspect of this invention, the internal diameter dimension of a large diameter part may be formed uniformly over the length direction of a large diameter part.
As a fourth aspect of the present invention, in a state where the internal combustion engine is viewed from above, the large diameter portion may be installed around the accessory on the lower side of the accessory.

As a fifth aspect of the present invention, the large-diameter portion is continuous with the small-diameter portion, is lower than the upper end portion of the auxiliary machine, and is continuous with the linear portion passing through the lower portion of the mounting device, An inclined portion extending from the straight portion toward the lower side of the auxiliary device, a first bending portion that is continuous with the inclined portion and curves from the inclined portion toward the lower side of the auxiliary device, and a first bending portion. A second curved portion that extends continuously and passes under the auxiliary machine in the vehicle width direction, curves backward from the internal combustion engine in the longitudinal direction of the vehicle, and then extends toward the lower side of the intake pipe. A tapered portion whose inner diameter is gradually reduced from the upstream side to the downstream side of the second curved portion, and the tapered portion and the intake air are introduced at the downstream end of the tapered portion. Forming a small-diameter pipe part connecting the pipe, and a large-diameter part constituted by a tapered part and a small-diameter pipe part. It may form a flow unit in a curved shape.

Thus, according to said 1st aspect, intercooler outlet piping is comprised including the large diameter part with a larger internal diameter dimension of an intercooler outlet piping, and the small diameter part with a smaller internal diameter dimension than a large diameter part, The large diameter portion is formed between the central portion in the longitudinal direction of the intercooler outlet pipe and the downstream end connected to the intake air introduction pipe.

For this reason, it is possible to optimize the intake pulsation that occurs when the intake valve is opened and closed, and to generate resonance of the intercooler outlet pipe in the high rotation range of the internal combustion engine. Therefore, the intake resistance at the downstream portion of the intercooler outlet pipe can be reduced in the normal rotation range of the internal combustion engine, and the amount of air taken into the internal combustion engine can be prevented from decreasing. As a result, the charging efficiency of the internal combustion engine can be improved, and the output of the internal combustion engine can be improved.

Also, since the large diameter portion is provided in the downstream portion of the intercooler outlet pipe, the surface area of the downstream portion of the intercooler outlet pipe can be increased and the inner diameter dimension of the downstream portion of the intercooler outlet pipe can be increased.

Therefore, it is possible to increase the surface area where the traveling wind introduced into the vehicle from the front of the vehicle hits the intercooler outlet pipe, and the air having a large flow rate flowing through the large diameter portion can be efficiently cooled by the intercooler outlet pipe.

As a result, the temperature of the air flowing through the intercooler outlet pipe can be further lowered by the traveling wind, the intake efficiency of the internal combustion engine can be increased more effectively, and the output of the internal combustion engine can be improved more effectively.

According to the second aspect, the intake air inlet pipe is extended from the surge tank to the lower side of the vehicle, and extended at least to the lower part of the auxiliary machine in the vehicle height direction, and the intercooler outlet pipe is connected to the air outlet pipe portion. To the intake pipe through the lower part of the mounting device and the auxiliary machine.

For this reason, the intercooler outlet pipe and the intake pipe can be installed so as to surround the auxiliary machine from the side to the lower side, and the intercooler outlet pipe and the intake pipe are exposed to the heat rising from the auxiliary machine. Can be prevented.

Therefore, the air cooled by the intercooler can be prevented from being heated, and the air flowing through the intercooler outlet pipe can be kept at a low temperature.
As a result, the air cooled by the intercooler can be introduced into the internal combustion engine from the intercooler outlet pipe through the intake manifold, and the charging efficiency of the internal combustion engine can be further increased to increase the output performance of the internal combustion engine more effectively.

In addition, the air outlet pipe is installed above the mounting device in the height direction of the vehicle, and the auxiliary machine is installed below the mounting device, and the intercooler outlet pipe is connected from the air outlet pipe to the bottom of the mounting device. And connected to the intake pipe through the lower part of the accessory.

For this reason, the intercooler outlet pipe can be installed low in the vehicle height direction from the front (upstream part) to the rear (downstream part) of the vehicle, and the height direction dimension of the intercooler outlet pipe in the vehicle height direction. Can be long.

Therefore, the surface area where the traveling wind introduced into the vehicle from the front of the vehicle hits the intercooler outlet piping can be increased, and the intercooler outlet piping can be cooled efficiently. As a result, the temperature of the air flowing through the intercooler outlet pipe can be further reduced by the traveling wind, and the charging efficiency of the internal combustion engine can be increased more effectively.

Moreover, since the large diameter part located in the downstream part of an intercooler outlet piping can be installed in the position lower than an upstream part in the height direction of a vehicle, the traveling wind which flows through the bottom part (for example, bottom part of an engine room) of a vehicle Large diameter part can be installed at many positions.

For this reason, more traveling wind can be applied to the large-diameter portion having a large surface area, and the air can be cooled more effectively. Therefore, the charging efficiency of the internal combustion engine can be increased more effectively.

Also, since the large diameter portion is provided below the auxiliary machine, it is possible to prevent the large diameter part from being exposed to the heat rising from the auxiliary machine. For this reason, it can prevent that the air cooled with the intercooler is heated, and can introduce | transduce low temperature air to an internal combustion engine.

Also, since the intercooler outlet piping is not installed in the space above the auxiliary machine, the space above the auxiliary machine can be expanded. For this reason, the accessory can be easily accessed from above, and the accessory can be easily attached to and detached from the internal combustion engine. Therefore, the workability of the maintenance work of the auxiliary machine can be improved.

Further, by passing the intercooler outlet pipe below the mount device, the intercooler outlet pipe is obstructed by the intercooler outlet pipe when the internal combustion engine is assembled to the vehicle body from below with the intercooler outlet pipe attached to the internal combustion engine. The internal combustion engine can be attached to the vehicle body via the mounting device. For this reason, the internal combustion engine can be easily assembled to the vehicle body.

According to said 3rd aspect, since the internal diameter dimension of a large diameter part is formed uniformly over the length direction of a large diameter part, it prevents that an intake pulsation is attenuate | damped by a large diameter part. Thus, the intake pulsation can be optimized. For this reason, it is possible to prevent the amount of air taken into the internal combustion engine from decreasing in the normal operating range of the internal combustion engine, improve the charging efficiency of the internal combustion engine more effectively, and improve the output of the internal combustion engine more effectively. it can.

According to said 4th aspect, in the state which looked at the internal combustion engine from the upper direction, a large diameter part is installed in the circumference | surroundings of an auxiliary machine in the downward side of an auxiliary machine. For this reason, if the large-diameter portion has a radius of curvature that draws a gentle curve, more air can be introduced into the internal combustion engine along the gentle curve with the volume of air passing through the large-diameter portion increased.
As a result, the amount of air taken into the internal combustion engine can be increased to improve the charging efficiency of the internal combustion engine more effectively, and the output of the internal combustion engine can be improved more effectively.

According to said 5th aspect, while comprising a large diameter part from a linear part, an inclination part, a 1st curved part, and a 2nd curved part, while being able to increase the air quantity introduce | transduced into an internal combustion engine, It is possible to increase the surface area of the large diameter portion where the traveling wind hits.

In addition, the large-diameter portion is continuous with the first curved portion that curves from the inclined portion toward the lower side of the auxiliary device, and passes through the lower portion of the auxiliary device in the vehicle width direction. And a second curved portion that extends downward from the internal combustion engine in the front-rear direction and then extends downward from the intake pipe.
For this reason, the air flowing from the upstream to the downstream of the intercooler outlet pipe can be introduced into the internal combustion engine while maintaining the momentum by the centrifugal force when passing through the first curved portion and the second curved portion.

In addition, a tapered portion whose inner diameter is gradually reduced from the upstream side of the second curved portion toward the downstream side is formed at the downstream portion of the second curved portion, and the tapered portion and the intake pipe are provided at the downstream end of the tapered portion. The small diameter pipe part to be connected was formed, and the downstream part of the large diameter part constituted by the tapered part and the small diameter pipe part was formed in a curved shape.

For this reason, the flow velocity of air can be increased by the small-diameter pipe portion before air is introduced into the intake air introduction pipe. Therefore, air with a high flow rate can be introduced into the surge tank, and the efficiency of filling the air introduced into the internal combustion engine can be increased effectively.

FIG. 1 is a view showing an intake device for an internal combustion engine with a supercharger according to an embodiment of the present invention, and is a plan view of a front portion of a vehicle. FIG. 2 is a view showing an intake device for an internal combustion engine with a supercharger according to an embodiment of the present invention, and is a side view of a front portion of a vehicle. FIG. 3 is a view showing an intake device for an internal combustion engine with a supercharger according to an embodiment of the present invention, and is a rear view of the internal combustion engine. FIG. 4 is a view showing the intake device for the supercharged internal combustion engine according to the embodiment of the present invention, and is a side view of the internal combustion engine around the intercooler outlet pipe. FIG. 5 is a view showing the intake device for the supercharged internal combustion engine according to the embodiment of the present invention, and is a plan view of the front portion of the vehicle with the alternator and the intake manifold removed. FIG. 6 is a diagram showing the relationship between the engine speed and the charging efficiency in the intercooler outlet piping in the conventional example having a constant inner diameter size and the intercooler outlet piping in the present embodiment having a different inner diameter size.

Hereinafter, embodiments of an intake device for an internal combustion engine with a supercharger according to the present invention will be described with reference to the drawings. 1 to 5 are views showing an intake device for an internal combustion engine with a supercharger according to an embodiment of the present invention.

First, the configuration of an intake device for an internal combustion engine with a supercharger according to this embodiment will be described. As shown in FIG. 1, the vehicle 1 includes a vehicle body 2, and the vehicle body 2 extends along the vehicle front-rear direction of the vehicle 1 and is installed on both sides in the vehicle width direction. Have

As shown in FIGS. 1 and 2, the vehicle body 2 includes a dash panel 3 at the front of the vehicle 1 in the front-rear direction of the vehicle. The dash panel 3 divides the vehicle body 2 into an engine room 4 that is installed on the front side in the front-rear direction of the vehicle 1 and a vehicle compartment 5 that is installed on the rear side in the front-rear direction of the vehicle 1 and on which a passenger rides. Hereinafter, expressions representing front and rear, such as front and rear, are directions with respect to the front-rear direction of the vehicle 1.

As shown in FIGS. 1, 2, and 5, an engine 6 as an internal combustion engine is installed in the engine room 4. The engine 6 is supported by the side frame 2A via a mount device 7 attached to one end 6a in the vehicle width direction. In the present embodiment, the side frame 2A is set on the right side in the vehicle width direction, and the vehicle width direction one end portion 6a is set as the right end portion of the engine 6.

As shown in FIG. 1, the mount device 7 is connected to the first mount bracket 7a fastened to one end 6a in the vehicle width direction of the engine 6, and is connected to the first mount bracket 7a and extends to the side frame 2A side. A second mount bracket 7b and a mount insulator portion 7c connected to the second mount bracket 7b and attached to the side frame 2A are provided.

As shown in FIG. 3, a transmission 8 is provided at the other end 6b of the engine 6 in the vehicle width direction. In the present embodiment, the left end of the engine 6 in the vehicle width direction is set as the other end 6b in the vehicle width direction. The transmission 8 provided at the other end 6b in the vehicle width direction is supported by the side frame 2B via a mount device (not shown). Here, the vehicle width direction one end portion 6a of the engine 6 corresponds to the vehicle width direction end portion of the internal combustion engine of the present invention.

As shown in FIGS. 1 and 2, the engine 6 is provided with a supercharger 9 and an intake device 10. As shown in FIGS. 1 and 3, the intake device 10 is provided on the front side of the engine 6. As shown in FIGS. 1 and 5, the intake device 10 includes an intake duct 11 that takes in air from the front of the vehicle 1, an air cleaner 12 that is connected to the downstream end of the intake duct 11 and purifies the air, and is purified by the air cleaner 12. And an air cleaner outlet pipe 13 for introducing the air into the compressor housing 9a of the supercharger 9.

As shown in FIGS. 1 and 5, the supercharger 9 includes a compressor (not shown) provided in the compressor housing 9a and a turbine housing 9b containing a turbine (not shown) that is rotated by the pressure of the exhaust gas. Yes.

As shown in FIGS. 1, 2, and 5, the intake device 10 includes an intercooler line pipe 14, an intercooler 15, an intercooler outlet pipe 16, and an intake manifold 17.

As shown in FIGS. 1, 2, and 5, the upstream end of the intercool line pipe 14 is connected to the compressor housing 9 a of the supercharger 9, and the downstream end of the inter cool line pipe 14 is connected to the intercooler 15. It is connected to the.

As shown in FIG. 1 and FIG. 5, the upstream end 16 a of the intercooler outlet pipe 16 is connected to the intercooler 15. A downstream end 16 b of the intercooler outlet pipe 16 is connected to the intake manifold 17. Here, upstream and downstream represent upstream and downstream with respect to the direction of air flow.

As shown in FIGS. 1 and 5, the supercharger 9 intercools air introduced from the air cleaner outlet pipe 13 to the compressor housing 9 a by a compressor that rotates integrally with a turbine that rotates under the pressure of exhaust gas. Supercharge the inlet pipe 14.

¡The temperature of this supercharged air rises. Therefore, this high-temperature air is introduced into the intercooler 15 and cooled by the intercooler 15. By cooling the supercharged air in this way, the oxygen density of the air is increased. The air having an increased oxygen density is introduced from the intercooler outlet pipe 16 through the intake manifold 17 into the combustion chamber through an intake port (not shown) of the engine 6. The intake port is opened and closed by an intake valve (not shown).

As shown in FIG. 2, the intercooler 15 is installed in front of the engine 6. The intercooler 15 includes a core portion 18, an upper tank 19, and a lower tank 20. The core portion 18 cools the air supplied from the supercharger 9 by traveling wind, and a circulation portion (not shown) through which air flows passes in the vertical direction or the vehicle width direction via a running air flow passage (not shown). It is installed side by side.

The lower tank 20 is provided in the lower part of the core part 18. The lower tank 20 is provided with an air inlet pipe portion 20a to which the intercool line pipe 14 is connected. The lower tank 20 introduces air introduced from the intercool linelet pipe 14 through the air inlet pipe portion 20 a into the core portion 18.

The upper tank 19 is provided in the upper part of the core part 18. As shown in FIGS. 1 to 3, the upper tank 19 is provided with an air outlet pipe portion 19a to which the upstream end 16a of the intercooler outlet pipe 16 is connected.

As shown in FIG. 2, the air cooled by the core portion 18 is introduced into the upper tank 19. The air introduced into the upper tank 19 is introduced into the intercooler outlet pipe 16 from the air outlet pipe portion 19a. As shown in FIG. 3, the air introduced into the intercooler outlet pipe 16 is introduced into the intake manifold 17.

As shown in FIG. 4, an alternator 21 is provided at the rear of the engine 6. A water pump 22 is provided at one end 6 a in the vehicle width direction of the engine 6.

The alternator 21 shown in FIGS. 1 to 4 constitutes a generator. The alternator 21 includes a rotor and a stator (not shown). A rotor (not shown) is rotatably supported by the housing 21A of the alternator 21. An alternator pulley 21B that protrudes outward from the vehicle width direction one end 6a of the engine 6 is provided at the end of the rotor. The alternator 21 generates high-temperature heat during operation. The alternator 21 of this embodiment corresponds to an auxiliary machine of the present invention.

2 and 4, in the water pump 22, for example, a rotating shaft 22C to which an impeller (not shown) is attached protrudes outward in the vehicle width direction from one end 6a in the vehicle width direction of the engine. A water pump pulley 22A is attached to the end of the rotating shaft 22C.

2 and 4, a timing belt 23 is wound around the alternator pulley 21B and the water pump pulley 22A. In addition, the timing belt 23 is also wound around the crank pulley 24. The crank pulley 24 is provided at the end of a crankshaft (not shown) and protrudes outward from one end 6a in the vehicle width direction of the engine 6.

Thereby, rotation of the crankshaft is transmitted to the alternator 21 and the water pump 22 via the timing belt 23. Therefore, the alternator 21 and the water pump 22 are driven in synchronization with the rotation of the crankshaft.

As shown in FIG. 3, the alternator 21 is installed below the surge tank 25 of the intake manifold 17 and near the vehicle width direction one end 6 a of the engine 6 on the side opposite to the transmission 8. The alternator 21 is installed at the center of the engine 6 in the height direction of the vehicle 1.

As shown in FIG. 3, the intake manifold 17 is attached to the rear part of the engine 6. The intake manifold 17 has a surge tank 25 that distributes intake air to the engine 6 and an intake introduction pipe 26 that is provided upstream of the surge tank 25. Here, in FIG. 1, FIG. 2, and FIG. 5, the small arrow shown with the code | symbol W1 has shown the direction through which air flows. As shown in FIG. 3, the intake intake pipe 26 extends from the surge tank 25 toward the lower side of the vehicle 1. The intake air introduction pipe 26 is connected to the intercooler outlet pipe 16.

As shown in FIGS. 1 to 4, after the intercooler outlet pipe 16 extends from the air outlet pipe portion 19a of the intercooler 15 along the vehicle width direction one end portion 6a of the engine 6, the downstream end 16b has the intake inlet pipe 26. It is connected to. The intercooler outlet pipe 16 is disposed so as to pass near the lower portion 21 a of the alternator 21.

As shown in FIG. 4, the air outlet pipe portion 19 a is installed above the mount device 7 in the height direction of the vehicle 1. The alternator 21 is installed below the first mount bracket 7a or the second mount bracket 7b constituting the mount device 7. In FIG. 4, the height of the air outlet pipe portion 19 a is indicated by a symbol T.

As shown in FIGS. 1 to 4, the intercooler outlet pipe 16 is disposed so as to pass from the air outlet pipe portion 19a below the first mount bracket 7a or the second mount bracket 7b constituting the mount device 7. And is connected to the intake pipe 26 through the lower part of the alternator 21.

As shown in FIG. 1 and FIG. 5, the intercooler outlet pipe 16 includes a large-diameter portion 16A having a large inner diameter and a small-diameter portion 16B having a smaller inner diameter than the large-diameter portion 16A.

As shown in FIG. 4, the large-diameter portion 16A is formed from the central portion C in the longitudinal direction of the intercooler outlet pipe 16 to the downstream end 16b connected to the intake air introduction pipe 26. As shown in FIGS. 4 and 5, the large-diameter portion 16 A is installed around the alternator 21 on the lower side of the alternator 21.

As shown in FIG. 4, the air outlet pipe portion 19 a is installed above the mount device 7 in the height direction of the vehicle 1. The alternator 21 is installed below the first mount bracket 7a or the second mount bracket 7b.

The intercooler outlet pipe 16 is connected from the air outlet pipe portion 19a to the intake inlet pipe 26 through the lower portion of the first mount bracket 7a or the second mount bracket 7b and the lower portion of the alternator 21.

As shown in FIGS. 1 and 3, the large-diameter portion 16A passes below the alternator 21 from the rear side of the mounting device 7 on the lower side of the first mounting bracket 7a or the second mounting bracket 7b. Has been placed. The large diameter portion 16 A is formed to extend to a position below the intake introduction pipe 26. The inner diameter of the large diameter portion 16A is formed to be the same over the length direction of the large diameter portion 16A.

As shown in FIG. 4, the large diameter portion 16 A is connected to the small diameter portion 16 B via a tip portion whose diameter is gradually reduced, and constitutes the mount device 7 at a position lower than the upper end portion 21 b of the alternator 21. A straight portion 16c that passes below the first mount bracket 7a or the second mount bracket 7b, and an inclined portion 16d that continues to the straight portion 16c and extends from the straight portion 16c toward the lower side of the alternator 21. I have.

Here, as shown in FIG. 4, in order to facilitate understanding of the positional relationship between the upper end portion 21b of the alternator 21 and the upper end portion 16u of the linear portion 16c, the upper end portion 21b of the alternator 21 and the upper end portion 16u of the linear portion 16c Is indicated by a leader line.

The large-diameter portion 16A has a curved portion 16e that is curved from the inclined portion 16d toward the lower side of the alternator 21 continuously to the inclined portion 16d, and a vehicle width that extends continuously from the curved portion 16e and extends below the alternator 21. And a curved portion 16f that is curved toward the rear of the engine 6 and extends toward the lower side of the intake air intake pipe 26. Here, the bending portion 16e corresponds to the first bending portion of the present invention, and the bending portion 16f corresponds to the second bending portion of the present invention.

As shown in FIG. 5, a tapered portion 16g is formed in the downstream portion of the bending portion 16f. The tapered portion 16g has an inner diameter that gradually decreases from the upstream side to the downstream side of the bending portion 16f. A small-diameter pipe portion 16h that connects the taper portion 16g and the intake pipe 26 is formed at the downstream end of the taper portion 16g.

As shown in FIG. 3, the large-diameter portion 16A of the present embodiment has a curved downstream portion formed by a tapered portion 16g and a small-diameter pipe portion 16h.

The large diameter portion 16A is integrally formed from the upstream end to the downstream end of the large diameter portion 16A. The downstream end of the small diameter pipe portion 16 h constitutes the downstream end 16 b of the intercooler outlet pipe 16. As shown in FIGS. 1, 2, 4, and 5, the upstream end of the small diameter portion 16 B constitutes the upstream end 16 a of the intercooler outlet pipe 16. The lower part of FIG. 4 shows a range from the straight part 16c to the inclined part 16d and the

curved parts

16e and 16f.

Next, the operation of the intake device for the supercharged internal combustion engine according to this embodiment will be described. In a two-cylinder engine or the like, when the piston phase moves up and down at 360 °, the intake port opening / closing timing is the same, so-called intermittent intake is performed, and intake pulsation occurs, resulting from intake pulsation. A pressure wave is generated.

This intake pulsation occurs when a reflected wave is generated by opening and closing the intake valve, and the reflected wave flows from the intake manifold 17 through the intercooler outlet pipe 16 to the intercooler 15 and rebounds at the air outlet pipe portion 19a of the intercooler 15. A wave is generated.

When the intercooler outlet pipe 16 resonates in the normal rotation range (for example, 3000 to 4500 rpm) of the engine 6 due to this standing wave, the intake resistance in the downstream portion of the intercooler outlet pipe 16 increases and is sucked into the engine 6. The amount of air that is produced decreases. As a result, the charging efficiency of the engine 6 decreases in the normal rotation range of the engine 6 and the output of the engine 6 may decrease.

On the other hand, according to the intake device 10 according to the present embodiment, it is possible to prevent the charging efficiency of the engine 6 from being lowered in the normal rotation range of the engine 6 and the output of the engine 6 from being lowered. That is, the intake device 10 according to the present embodiment includes an intercooler outlet pipe 16 that includes a large-diameter portion 16A having a large inner diameter and a small-diameter portion 16B having a smaller inner diameter than the large-diameter portion 16A. It consists of. Further, in the intake device 10 according to the present embodiment, the large-diameter portion 16A is formed between the central portion C in the length direction of the intercooler outlet pipe 16 and the downstream end 16b connected to the intake introduction pipe 26.

For this reason, in the intake device 10 according to the present embodiment, the intake pulsation can be shifted to the high rotation range of the engine 6 and the intake pulsation can be optimized. That is, in the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 is provided with a large diameter portion 16A, and the internal diameter and length of the large diameter portion 16A are increased, whereby the natural vibration of the intercooler outlet pipe 16 is increased. The natural frequency can be shifted to the high rotation range of the engine 6 by increasing the number.

In addition, in the intake pulsation, a standing wave generated inside the intercooler outlet pipe 16 becomes a pressure wave. When the large diameter portion 16A is provided in the downstream portion of the intercooler outlet pipe 16, a decrease in the attenuation amount of the reflected wave reflected from the intake valve is suppressed and the air outlet pipe portion 19a of the intercooler 15 is passed through the intercooler outlet pipe 16. The reflected wave can be transmitted, and the intake pulsation can be shifted to the high rotation range of the engine 6.

On the other hand, if the inner diameter of the intercooler outlet pipe is the same, the resonance frequency is lower than that of the intercooler outlet pipe having the large diameter portion 16A of the intake device 10 according to the present embodiment, and the normal rotation of the engine 6 is performed. Inspiratory pulsation shifts in the area.

Further, when the large diameter portion is provided upstream of the intercooler outlet pipe 16, the pressure of the reflected wave generated by the intake valve rapidly decreases at the portion of the intercooler outlet pipe where the small diameter portion changes to the large diameter portion. The reflected wave is attenuated before reaching the upstream portion of the outlet pipe 16.

If the reflected wave is attenuated in this way, the intake pulsation cannot be shifted to the high rotation range of the engine 6 and the resonance frequency of the intercooler outlet pipe is in the normal rotation range. The pulsation resonates and intake resistance increases downstream of the intercooler outlet pipe.

FIG. 6 shows the engine speed (rpm) and the charging efficiency (%) of the engine 6 in a conventional intercooler outlet pipe having a constant inner diameter dimension and the intercooler outlet pipe 16 of the present embodiment having a different inner diameter dimension. It is a figure which shows the result measured by experiment.

As apparent from FIG. 6, when the intercooler outlet pipe 16 having the large-diameter portion 16 A is used downstream (indicated by reference numeral A) than when the intercooler outlet pipe having the same inner diameter dimension is used (indicated by reference numeral A). It is proved that the charging efficiency of the engine 6 is improved by the amount indicated by the arrow C in the high rotation range of the engine 6.

As described above, the intake device 10 according to the present embodiment increases the natural frequency of the intercooler outlet pipe 16 and suppresses the decrease in the attenuation of the reflected wave reflected from the intake valve, thereby reducing the air outlet pipe portion 19a of the intercooler 15. The reflected wave can be transmitted to the.

Thereby, in the intake device 10 according to the present embodiment, the resonance point between the standing wave and the large-diameter portion 16A of the intercooler outlet pipe 16 is moved to the high rotation region, and the intercooler 15 is moved in the normal rotation region of the engine 6. Downstream intake resistance can be reduced. As a result, in the intake device 10 according to the present embodiment, the amount of air sucked into the engine 6 in the normal rotation range of the engine 6 can be prevented, the charging efficiency of the engine 6 can be improved, and the output of the engine 6 can be improved. Can be improved.

On the other hand, in the intake device 10 according to the present embodiment, the intercooler 15 is installed in front of the engine 6, and the intake manifold 17 is installed in the rear part of the engine 6. An alternator 21 that generates high-temperature heat during operation is installed at one end 6a of the engine 6 in the vehicle width direction.

Therefore, the intercooler outlet piping 16 needs to be laid out from the front of the engine 6 to the rear of the engine 6 through the vehicle width direction one end portion 6a. However, during operation of the engine 6, the heat generated from the alternator 21 and rising (indicated by an arrow with a symbol H in FIG. 3) stays above the alternator 21. For this reason, when the intercooler outlet pipe 16 is installed above the alternator 21, the air cooled by the intercooler 15 may be heated by the heat accumulated in the upper part.

On the other hand, according to the intake device 10 according to the present embodiment, by providing the large diameter portion 16A in the downstream portion of the intercooler outlet pipe 16, the surface area of the downstream portion of the intercooler outlet pipe 16 can be increased. The inner diameter dimension of the downstream part of the intercooler outlet piping 16 can be increased.

For this reason, according to the intake device 10 according to the present embodiment, the surface area on which the traveling wind W (see FIGS. 2 and 4) introduced into the vehicle 1 from the front of the vehicle 1 hits the intercooler outlet pipe 16 can be increased. The air having a large flow rate flowing through the diameter portion 16 A can be efficiently cooled by the intercooler outlet pipe 16.

As a result, according to the intake device 10 according to the present embodiment, the temperature of the air flowing through the intercooler outlet pipe 16 can be further reduced by the traveling wind W, and the intake efficiency of the engine can be increased more effectively. The output of 6 can be improved more effectively.

Further, in the intake device 10 of the present embodiment, the intake inlet pipe 26 is extended from the surge tank 25 to the lower side of the vehicle 1 and is extended to the lower part of the alternator 21 in the height direction of the vehicle 1, so that the intercooler outlet pipe 16 is The air outlet pipe portion 19a was connected to the intake air introduction pipe 26 through the lower portion of the first mount bracket 7a or the second mount bracket 7b constituting the mount device and the lower portion of the alternator 21.

Therefore, according to the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 and the intake introduction pipe 26 can be installed so as to surround the alternator 21 from the side to the lower side, and the heat rising from the alternator 21 It is possible to prevent the intercooler outlet pipe 16 and the intake air inlet pipe 26 from being exposed. Therefore, according to the intake device 10 according to the present embodiment, the air cooled by the intercooler 15 can be prevented from being heated, and the air flowing through the intercooler outlet pipe 16 can be kept at a low temperature.

As a result, according to the intake device 10 according to the present embodiment, the air cooled by the intercooler 15 can be introduced into the engine 6 from the intercooler outlet pipe 16 through the intake manifold 17, and the charging efficiency of the engine 6 can be improved to increase the engine 6. Output performance can be improved.

Further, in the intake device 10 according to the present embodiment, the air outlet pipe portion 19a is installed above the first mount bracket 7a or the second mount bracket 7b in the height direction of the vehicle 1, and the alternator 21 is installed in the first direction. It is installed below the first mount bracket 7a or the second mount bracket 7b. In the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 is connected from the air outlet pipe portion 19a to the intake inlet pipe 26 through the lower portion of the first mount bracket 7a or the second mount bracket 7b and the lower portion of the alternator 21. did.

For this reason, according to the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 can be installed low in the height direction of the vehicle 1 from the front (upstream portion) to the rear (downstream portion) of the vehicle. The height of the intercooler outlet pipe 16 can be increased in the height direction.

Therefore, the surface area where the traveling wind W introduced into the vehicle 1 from the front of the vehicle 1 hits the intercooler outlet pipe 16 can be increased, and the intercooler outlet pipe 16 can be efficiently cooled. As a result, the temperature of the air flowing through the intercooler outlet pipe 16 can be further reduced by the traveling wind W, and the charging efficiency of the engine 6 can be increased more effectively.

Further, since the large diameter portion 16A located at the downstream portion of the intercooler outlet pipe 16 can be installed at a position lower than the upstream portion in the height direction of the vehicle 1, the traveling wind flowing through the bottom of the engine room 4 is located at a large position. Large diameter part 16A can be installed. For this reason, in the intake device 10 according to the present embodiment, a larger amount of traveling wind can be applied to the large-diameter portion 16A having a large surface area, and the air can be cooled more effectively. Therefore, in the intake device 10 according to the present embodiment, the charging efficiency of the engine 6 can be more effectively increased.

Moreover, in the intake device 10 according to the present embodiment, the large-diameter portion 16A is provided below the alternator 21, so that the large-diameter portion 16A can be prevented from being exposed to heat rising from the alternator 21. According to the intake device 10 according to the present embodiment, the air cooled by the intercooler 15 can be prevented from being heated, and low-temperature air can be introduced into the engine 6.

Further, in the intake device 10 according to the present embodiment, since the intercooler outlet pipe 16 is not installed in the space above the alternator 21, the space above the alternator 21 can be expanded. For this reason, according to the intake device 10 according to the present embodiment, the alternator 21 can be easily accessed from above, and the alternator 21 can be easily attached to and detached from the engine 6. Therefore, in the intake device 10 according to the present embodiment, the workability of the maintenance work of the alternator 21 can be improved.

Furthermore, in the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 is allowed to pass under the first mount bracket 7a or the second mount bracket 7b. Thereby, in the intake device 10 according to the present embodiment, the intercooler outlet pipe 16 is obstructed by the intercooler outlet pipe 16 when the engine 6 is assembled to the vehicle body 2 from below with the intercooler outlet pipe 16 attached to the engine 6. There is no. In the intake device 10 according to the present embodiment, the first mount bracket 7a provided in the engine 6 is directed to the second mount bracket 7b connected to the mout insulator portion 7c, whereby the engine 6 is mounted on the mount device. 7 can be attached to the side frame 2A. For this reason, according to the intake device 10 according to the present embodiment, the engine 6 can be easily assembled to the vehicle body 2.

Further, according to the intake device 10 according to the present embodiment, the inner diameter of the large diameter portion 16A is formed to be the same over the length direction of the large diameter portion 16A, so that intake pulsation is generated in the large diameter portion 16A. It is possible to optimize the intake pulsation by preventing attenuation. For this reason, according to the intake device 10 according to the present embodiment, in the normal operation region of the engine 6, the amount of air sucked into the engine 6 is prevented from decreasing, and the charging efficiency of the engine 6 is more effectively improved. The output of the engine 6 can be improved more effectively.

Further, according to the intake device 10 of the present embodiment, the large-diameter portion 16A is installed around the alternator 21 on the lower side of the alternator 21 when the engine 6 is viewed from above. Therefore, if the large-diameter portion 16A has a curvature radius that draws a gentle curve, more air is introduced into the engine 6 along the gentle curve with the volume of air passing through the large-diameter portion 16A increased. it can. As a result, according to the intake device 10 according to the present embodiment, the amount of air sucked into the engine 6 can be increased to improve the charging efficiency of the engine 6 more effectively, and the output of the engine 6 can be improved more effectively. it can.

Further, according to the present embodiment, the large-diameter portion 16A includes the straight portion 16c, the inclined portion 16d, and the

curved portions

16e and 16f, so that the amount of air introduced into the engine 6 can be increased and the traveling wind can be increased. The surface area of the large-diameter portion 16A can be increased.

Further, the large-diameter portion 16A is curved from the inclined portion 16d toward the lower side of the alternator 21, and is continuous to the curved portion 16e and disposed below the alternator 21 along the vehicle width direction. It is a shape that curves backward from the engine 6 in the front-rear direction, and includes a curved portion 16 f that extends toward the lower side of the intake air introduction pipe 26. For this reason, according to the intake device 10 according to the present embodiment, the air flowing from the upstream to the downstream of the intercooler outlet pipe 16 is introduced into the engine 6 while maintaining the momentum by the centrifugal force when passing through the

curved portions

16e and 16f. it can.

Further, in the intake device 10 according to the present embodiment, a tapered portion 16g whose inner diameter dimension is gradually reduced from the upstream side to the downstream side of the curved portion 16f is formed in the downstream portion of the curved portion 16f, and is formed at the downstream end of the tapered portion 16g. A small-diameter pipe portion 16h that connects the tapered portion 16g and the intake pipe 26 is formed, and a downstream portion of the large-diameter portion 16A constituted by the tapered portion 16g and the small-diameter pipe portion 16h is formed in a curved shape.

For this reason, according to the intake device 10 according to the present embodiment, the flow velocity of air can be increased by the small-diameter pipe portion 16h before air is introduced into the intake introduction pipe 26. Therefore, in the intake device 10 according to the present embodiment, air with a high flow velocity can be introduced into the surge tank 25, and can be effectively enhanced by the charging efficiency of the air introduced into the engine 6. In addition, in the intake device 10 according to the present embodiment, the auxiliary machine is configured from the alternator 21, but the auxiliary machine is not limited to the alternator 21 as long as the auxiliary machine generates heat.

Although 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.

1 vehicle 2 vehicle body 6 engine (internal combustion engine)
6a One end in the vehicle width direction (end in the vehicle width direction)
7 mount device 9 supercharger 10 intake device 15 intercooler 16 intercooler outlet piping 16A large diameter portion 16B small diameter portion 16c linear portion 16d inclined portion 16e curved portion (first curved portion)
16f bending portion (second bending portion)
16d Taper part 16h Small diameter pipe part 17 Intake manifold 19a Air outlet pipe part 21 Alternator (auxiliary machine)
21b Upper end (upper end of auxiliary machine)
25 Surge tank 26 Air intake pipe

Claims

An intake device attached to an internal combustion engine having a supercharger,
An intake manifold having a surge tank attached to a rear portion in the front-rear direction of the internal combustion engine and an intake introduction pipe provided in an upstream portion of the surge tank;
An intercooler installed in front of the internal combustion engine, having an air outlet pipe, and connected to the supercharger via an intercool line pipe;
An intercooler outlet pipe that extends from the air outlet pipe portion of the intercooler along the vehicle width direction end of the internal combustion engine and is connected to the intake air introduction pipe;
The intercooler outlet pipe is configured to include a large diameter part having a large inner diameter dimension of the intercooler outlet pipe and a small diameter part having a smaller inner diameter dimension than the large diameter part,
The intake device for an internal combustion engine with a supercharger, wherein the large diameter portion is formed between a central portion in a longitudinal direction of the intercooler outlet pipe and a downstream end connected to the intake introduction pipe.
An auxiliary machine that generates heat at the time of operation is supported at the vehicle width direction end of the internal combustion engine via a mounting device on the vehicle body, and at the rear part in the front-rear direction of the internal combustion engine and below the surge tank. Installed and
The intake pipe is extended from the surge tank to the lower side of the vehicle, and extended at least to the lower part of the auxiliary machine in the height direction of the vehicle,
In the height direction of the vehicle, the air outlet pipe portion is installed above the mount device, and the auxiliary machine is installed below the mount device,
Connecting the intercooler outlet pipe from the air outlet pipe part to the intake pipe through the lower part of the mounting device and the auxiliary machine,
The large-diameter portion is on the lower side of the mounting device and from the rear portion of the mounting device in the front-rear direction of the vehicle to the position separated from the intake air introduction pipe at least downward from the auxiliary machine. The intake device for an internal combustion engine with a supercharger according to claim 1, characterized in that the intake device is formed as described above.
The intake device for an internal combustion engine with a supercharger according to claim 2, wherein the inner diameter of the large diameter portion is the same in the length direction of the large diameter portion.
4. The turbocharger according to claim 2, wherein the large-diameter portion is installed around the auxiliary machine on a lower side of the auxiliary machine when the internal combustion engine is viewed from above. 5. Intake device for internal combustion engine.
The large-diameter portion is continuous with the small-diameter portion, is at a position lower than the upper end portion of the auxiliary machine, and is continuous with the linear portion passing through the lower portion of the mount device. An inclined portion extending toward the lower side of the accessory, a first curved portion that is continuous with the inclined portion and curves from the inclined portion toward the lower side of the auxiliary device, and the first curved portion And a second portion that extends downward from the internal combustion engine and extends downward from the internal combustion engine in the front-rear direction of the vehicle. And a curved portion,
A tapered portion whose inner diameter dimension gradually decreases from upstream to downstream of the second curved portion is formed in the downstream portion of the second curved portion, and the tapered portion and the intake air introduction are provided at the downstream end of the tapered portion. 5. A small-diameter pipe portion connected to a pipe is formed, and a downstream portion of the large-diameter portion constituted by the tapered portion and the small-diameter pipe portion is formed in a curved shape. The intake device for an internal combustion engine with a supercharger according to any one of the above.