JP6331603B2 - Intake device for an internal combustion engine with a supercharger - Google Patents

Description

  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 that includes an intercooler that cools air introduced from the supercharger into the internal combustion engine.

  In general, an internal combustion engine of a vehicle such as an automobile is provided with an intercooler that cools air that has been supercharged by a compressor of a supercharger and increased in temperature. 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.

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, and the intercooler outlet pipe extends from the lower tank of the intercooler to the vehicle width on the transmission side of the internal combustion engine. The vehicle extends obliquely upward of 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 direction.

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. .

  In addition, the air cleaner inlet pipe described in Patent Document 1 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. For this reason, the traveling wind from the front of the vehicle is blocked by the air cleaner inlet pipe, is difficult to hit the intercooler outlet pipe, and the air flowing through the intercooler outlet pipe cannot be efficiently cooled.

  As a result, 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, the charging efficiency of the internal combustion engine cannot be increased, and it becomes difficult to improve 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 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 cross-sectional area formed from the inner diameter of the intercooler outlet pipe. a large-diameter portion is configured to include a small diameter portion is smaller cross-sectional area formed from the inner diameter dimension than the large diameter portion, the small diameter portion, inter cooler out Les Is formed from an upstream end connected to the air outlet pipe portion of the bets pipe to the central longitudinal portion of the inter cooler outlet pipe, the large diameter portion, connected to the intake air introduction pipe from the longitudinal central portion of the inter cooler outlet pipe It is comprised from what is formed between the downstream ends.

  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 is separated from at least 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 lower side of the auxiliary equipment and at least 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. A small-diameter pipe part that connects to the pipe is formed, and the lower-diameter part constituted by the tapered part and the small-diameter pipe part is Parts may be formed 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 generated 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.

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

  For this reason, the surface area where the traveling wind introduced into the vehicle from the front of the vehicle hits the intercooler outlet pipe can be increased, 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 reduced 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 pipe can be increased, and the intercooler outlet pipe can be efficiently cooled. 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 more to a large diameter part with a large surface area, and air can be cooled more effectively. Therefore, the charging efficiency of the internal combustion engine can be increased more effectively.

  Further, 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.

  In addition, since the intercooler outlet pipe 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 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 embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and is a top view of a front portion of a vehicle. FIG. 2 is a view showing an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and is a side view of a front portion of a vehicle. FIG. 3 is a view showing an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and is a rear view of the internal combustion engine. FIG. 4 is a view showing an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and is a side view of the internal combustion engine around an intercooler outlet pipe. FIG. 5 is a view showing an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and is a top view of a front portion of a vehicle in a state where an alternator and an intake manifold are removed. FIG. 6 is a view showing an embodiment of an intake device for an internal combustion engine with a supercharger according to the present invention, and a conventional intercooler outlet pipe having a constant inner diameter size and an intercooler outlet of the present embodiment having a different inner diameter size. It is a figure which shows the relationship between the engine speed in piping, and charging efficiency.

Embodiments of an intake device for an internal combustion engine with a supercharger according to the present invention will be described below with reference to the drawings.
FIGS. 1-6 is a figure which shows the intake device of the internal combustion engine with a supercharger of one Embodiment which concerns on this invention.

First, the configuration will be described.
In FIG. 1, a vehicle 1 includes a vehicle body 2, and the vehicle body 2 includes side frames 2 </ b> A and 2 </ b> B that extend in the front-rear direction of the vehicle 1 and are installed in the vehicle width direction.

  1 and 2, the vehicle body 2 includes a dash panel 3 in front of the vehicle 1 in the front-rear direction, and the dash panel 3 includes an engine room 4 installed in front of the vehicle 1 in the front-rear direction and the vehicle. The vehicle compartment 5 is installed at the rear of the vehicle 1 in the front-rear direction and is occupied by a passenger. Hereinafter, expressions representing front and rear, such as front and rear, are directions with respect to the front-rear direction of the vehicle 1.

  An engine 6 as an internal combustion engine is installed in the engine room 4, and the engine 6 is supported on the side frame 2 </ b> A via a mount device 7 attached to one end 6 a in the vehicle width direction.

  The mount device 7 includes a first mount bracket 7a that is fastened to one end 6a in the vehicle width direction of the engine 6 and a second mount bracket 7b that is connected to the first mount bracket 7a and extends toward the side frame 2A. And a mount insulator portion 7c connected to the second mount bracket 7b and attached to the side frame 2A.

  As shown in FIG. 3, a transmission 8 is provided at the other end 6b in the vehicle width direction of the engine 6, and the transmission 8 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 constitutes the vehicle width direction end portion of the internal combustion engine of the present invention.

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

  In FIG. 1, the supercharger 9 includes a compressor (not shown) provided inside a compressor housing 9a and a turbine housing 9b containing a turbine (not shown) that is rotated by the pressure of exhaust gas.

  The intake device 10 includes an intercooler line 14, an intercooler 15, an intercooler outlet line 16, and an intake manifold 17.

  The upstream end of the intercool linelet pipe 14 is connected to the compressor housing 9 a of the supercharger 9, and the downstream end of the intercoollinelet pipe 14 is connected to the intercooler 15.

  An upstream end 16 a of an intercooler outlet pipe 16 is connected to the intercooler 15, and a downstream end 16 b of the intercooler outlet pipe 16 is connected to an intake manifold 17. Here, upstream and downstream represent upstream and downstream with respect to the direction of air flow.

  The supercharger 9 supercharges the air introduced into the compressor housing 9a from the air cleaner outlet pipe 13 to the intercooler line pipe 14 by a compressor that rotates integrally with a turbine that rotates under the pressure of the exhaust gas.

  Since the temperature of the supercharged air rises, the hot air is introduced into the intercooler 15 and cooled by the intercooler 15. Thereby, the oxygen density of air is raised. 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).

  In FIG. 2, the intercooler 15 is installed in front of the engine 6, and 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 below the core portion 18, and the lower tank 20 is provided with an air inlet pipe portion 20 a 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, and the upper tank 19 is provided with an air outlet pipe part 19a to which the upstream end 16a of the intercooler outlet pipe 16 is connected (see FIGS. 1 and 2). .

  Air cooled by the core portion 18 is introduced into the upper tank 19, and the air introduced into the upper tank 19 is introduced into the intake manifold 17 from the air outlet pipe portion 19 a through the intercooler outlet pipe 16. Is done.

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

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

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

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

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

  In FIG. 1 to 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. In the vertical direction, it is installed at the center of the engine 6.

In FIG. 3, the intake manifold 17 is attached to the rear portion of the engine 6, and includes 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, FIG.5, the small arrow shown by the arrow W1 has shown the direction through which air flows.
As shown in FIG. 3, the intake pipe 26 extends from the surge tank 25 to the lower side of the vehicle 1 and extends to the lower portion 21 a of the alternator 21 in the height direction of the vehicle 1.

  1 to 4, the intercooler outlet pipe 16 extends from the air outlet pipe portion 19 a of the intercooler 15 along the vehicle width direction one end portion 6 a of the engine 6, and then the downstream end 16 b is connected to the intake air introduction pipe 26. ing.

  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, and the alternator 21 includes a first mount bracket 7 a constituting the mount device 7 or It is installed below the second mount bracket 7b. In FIG. 4, the height of the air outlet pipe portion 19 a is indicated by a symbol T.

  The intercooler outlet pipe 16 passes from below the first mount bracket 7a or the second mount bracket 7b constituting the mount device 7 from the air outlet pipe portion 19a, and then connects to the intake inlet pipe 26 through the lower portion of the alternator 21. Has been.

  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.

  The large-diameter portion 16A is formed between the central portion C in the longitudinal direction of the intercooler outlet pipe 16 and the downstream end 16b connected to the intake air introduction pipe 26. As shown in FIGS. In a state where 6 is viewed from above, the large-diameter portion 16 </ b> A is installed around the alternator 21 on the lower side of the alternator 21.

  Further, in the height direction of the vehicle 1, the air outlet pipe portion 19a is installed above the mount device 7, and the alternator 21 is below the first mount bracket 7a or the second mount bracket 7b. is set up.

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

  The large-diameter portion 16A is located below the first mount bracket 7a or the second mount bracket 7b and from the rear of the mount device 7 below the alternator 21 and spaced downward from the intake pipe 26. The inner diameter of the large diameter portion 16A installed in this range is the same over the length direction of the large diameter portion 16A.

  In FIG. 4, the large-diameter portion 16 </ b> A is connected to the small-diameter portion 16 </ b> B via a tapered tip portion, and is located at a position lower than the upper end portion 21 b of the alternator 21 and constitutes the mount device 7. Alternatively, a linear portion 16c that passes below the second mount bracket 7b and an inclined portion 16d that continues from the linear portion 16c and extends toward the lower side of the alternator 21 are provided.

  Here, in FIG. 4, in order to make it easy to understand 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 are drawn out. It shows with.

  The large-diameter portion 16A is continuous with the inclined portion 16d, and is curved toward the lower side of the alternator 21 from the inclined portion 16d. The large-diameter portion 16A is continuous with the curved portion 16e and extends below the alternator 21 in the vehicle width direction. A curved portion 16f that passes and curves toward the rear of the engine 6 and extends toward the lower side of the intake air intake pipe 26 is provided. Here, the bending portion 16e constitutes the first bending portion of the present invention, and the bending portion 16f constitutes the second bending portion of the present invention.

  In FIG. 5, a tapered portion 16g whose inner diameter is gradually reduced from the upstream side to the downstream side of the curved portion 16f is formed at the downstream portion of the curved portion 16f, and the tapered portion 16g and the intake air are formed at the downstream end of the tapered portion 16g. A small-diameter pipe portion 16h that connects the introduction pipe 26 is formed.

  Thereby, as for the large diameter part 16A of this embodiment, the downstream part comprised by the taper part 16g and the small diameter pipe part 16h is formed in a curved shape.

  The large diameter portion 16A is integrally formed from the upstream end of the large diameter portion 16A toward the downstream end, and the downstream end of the small diameter pipe portion 16h constitutes the downstream end 16b of the intercooler outlet pipe 16. Further, the upstream end of the small diameter portion 16 </ b> B constitutes the upstream end 16 a of the intercooler outlet pipe 16. In FIG. 4, the range from the straight part 16c to the inclined part 16d and the curved parts 16e and 16f is shown.

Next, the operation 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.

  If the intercooler outlet pipe 16 resonates in the normal rotation range (for example, 3000 to 4500 rpm) of the engine 6 due to the standing wave, the intake resistance in the downstream portion of the intercooler outlet pipe 16 increases, and the intake air is sucked into the engine 6. The amount of air that is produced decreases. As a result, the charging efficiency of the engine 6 may decrease 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 of the present embodiment, the intercooler outlet pipe 16 includes a large-diameter portion 16A having a large inner diameter dimension and a small-diameter section having a smaller inner diameter dimension than the large-diameter section 16A. 16B, and 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.

  For this reason, 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 of the present embodiment, the intercooler outlet pipe 16 is provided with a large-diameter portion 16A, and the natural frequency of the intercooler outlet pipe 16 is increased by increasing the inner diameter dimension and the length dimension of the large-diameter section 16A. And the natural frequency can be shifted to the high rotation range of the engine 6.

  The intake pulsation is a reflected wave reflected from the intake valve when a standing wave generated inside the intercooler outlet pipe 16 becomes a pressure wave and a large diameter portion 16A is provided downstream of the intercooler outlet pipe 16. Therefore, the reflected wave can be transmitted to the air outlet pipe portion 19a of the intercooler 15 through the intercooler outlet pipe 16, and the intake pulsation can be shifted to the high rotation range of the engine 6.

  In contrast, 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 present embodiment, and intake pulsation is generated in the normal rotation region of the engine 6. It will shift.

  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 </ b> A in the downstream portion is used (indicated by the arrow) than when the intercooler outlet pipe having the same inner diameter is used (indicated by the arrow 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 of the present embodiment increases the natural frequency of the intercooler outlet pipe 16 and suppresses the decrease in the attenuation amount of the reflected wave reflected from the intake valve, so that the air outlet pipe portion 19a of the intercooler 15 is provided. A reflected wave can be transmitted.

  As a result, the resonance point between the standing wave and the large-diameter portion 16A of the intercooler outlet pipe 16 can be moved to the high rotation region, and the intake resistance downstream of the intercooler 15 can be reduced in the normal rotation region of the engine 6. . As a result, the amount of air taken into the engine 6 in the normal rotation range of the engine 6 can be prevented from being lowered, the charging efficiency of the engine 6 can be improved, and the output of the engine 6 can be improved.

  On the other hand, in the intake device 10 of 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.

  For this reason, 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, when the engine 6 is in operation, the heat generated by the alternator 21 and rising (indicated by an arrow H in FIG. 3) stays above the alternator 21, and the intercooler outlet pipe 16 is installed above the alternator 21. The air cooled by the intercooler 15 may be heated by the heat that stays upward.

  On the other hand, according to the intake device 10 of the present embodiment, since the large diameter portion 16A is provided 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 and the intercooler. The inner diameter of the downstream part of the outlet pipe 16 can be increased.

  For this reason, the surface area which the traveling wind W (refer FIG. 2, FIG. 4) introduce | transduced into the vehicle 1 from the front of the vehicle 1 hits the intercooler outlet piping 16 can be increased, and the air with the large flow volume which flows through the large diameter part 16A is made into an intercooler. The 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, the intake efficiency of the engine can be increased more effectively, and the output of the engine 6 can be improved more effectively.

  Further, according to the intake device 10 of the present embodiment, the intake introduction 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, thereby intercooler outlet piping. 16 is connected to the intake air introduction pipe 26 from the air outlet pipe portion 19a through the lower portion of the first mount bracket 7a or the second mount bracket 7b and the lower portion of the alternator 21 constituting the mount device.

  For this reason, the intercooler outlet pipe 16 and the intake air inlet pipe 26 can be installed so as to surround the alternator 21 from the side to the lower side, and the intercooler outlet pipe 16 and the intake air inlet pipe 26 are caused by the heat rising from the alternator 21. It can be prevented from being exposed. Therefore, 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, 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 increased and the output performance of the engine 6 can be improved.

  In addition, 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 connected to the first mount bracket 7a or the second mount. Installed below the bracket 7b, the intercooler outlet pipe 16 is connected from the air outlet pipe portion 19a to the intake inlet pipe 26 through the first mount bracket 7a or the second mount bracket 7b and the alternator 21. .

  For this reason, the intercooler outlet piping 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, and the height of the intercooler outlet piping 16 in the height direction of the vehicle 1. The vertical dimension can be increased.

  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, more traveling wind can be applied more to the large-diameter portion 16A having a large surface area, and the air can be cooled more effectively. Therefore, the charging efficiency of the engine 6 can be increased more effectively.

  In addition, since the large diameter portion 16A is provided below the alternator 21, it is possible to prevent the large diameter portion 16A from being exposed to the heat rising from the alternator 21. 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, 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, 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, the workability of the maintenance work of the alternator 21 can be improved.

  Further, the intercooler outlet pipe 16 is passed under the first mount bracket 7a or the second mount bracket 7b. As a result, when the intercooler outlet pipe 16 is attached to the engine 6 and the engine 6 is assembled to the vehicle body 2 from below, the intercooler outlet pipe 16 is not obstructed by the first intercooler outlet pipe 16 and is provided in the engine 6. The engine 6 can be attached to the side frame 2 </ b> A via the mounting device 7 by directing the mounting bracket 7 a toward the second mounting bracket 7 b connected to the mantle insulator portion 7 c. For this reason, the engine 6 can be easily assembled to the vehicle body 2.

  Further, according to the intake device 10 of 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 the intake pulsation is attenuated by the large diameter portion 16A. It is possible to optimize the intake air pulsation. For this reason, in the normal operating region of the engine 6, it is possible to prevent the amount of air sucked into the engine 6 from being lowered, to improve the charging efficiency of the engine 6 more effectively, and to increase the output of the engine 6 more effectively. Can be improved.

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, the amount of air taken into the engine 6 can be increased, the charging efficiency of the engine 6 can be improved more effectively, and the output of the engine 6 can be improved more effectively.

  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.

The large-diameter portion 16A is curved from the inclined portion 16d toward the lower side of the alternator 21, and continues to the curved portion 16d and passes below the alternator 21 in the vehicle width direction. And a curved portion 16f extending downward from the intake pipe 26 after being curved rearward from the engine 6.
For this reason, the air flowing from the upstream to the downstream of the intercooler outlet pipe 16 can be introduced into the engine 6 while maintaining the momentum by the centrifugal force when passing through the curved portions 16e and 16f.

  Further, a taper portion 16g whose inner diameter dimension gradually decreases from the upstream side to the downstream side of the bending portion 16f is formed at the downstream portion of the bending portion 16f, and the taper portion 16g and the intake pipe 26 are provided at the downstream end of the taper portion 16g. The small-diameter pipe portion 16h to be connected was formed, and the downstream portion of the large-diameter portion 16A constituted by the tapered portion 16g and the small-diameter pipe portion 16h was formed in a curved shape.

For this reason, the flow velocity of air can be increased by the small-diameter pipe portion 16h before air is introduced into the intake air introduction pipe 26. Therefore, air having a high flow velocity can be introduced into the surge tank 25, and the efficiency of filling the air introduced into the engine 6 can be effectively increased.
In addition, in the intake device 10 of this embodiment, although the auxiliary machine was comprised from the alternator 21, if it is an auxiliary machine which generate | occur | produces heat, it will not be limited to the alternator 21.

  While embodiments of the 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 invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Vehicle body, 6 ... Engine (internal combustion engine), 6a ... One end part in the vehicle width direction (end part in the vehicle width direction), 7 ... Mount device, 9 ... Supercharger, 10 ... Intake device, 15 ... Intercooler , 16 ... intercooler outlet piping, 16A ... large diameter part, 16B ... small diameter part, 16c ... linear part, 16d ... inclined part, 16e ... bending part (first bending part), 16f ... bending part (second bending part) Part), 16d ... taper part, 16h ... small diameter pipe part, 17 ... intake manifold, 19a ... air outlet pipe part, 21 ... alternator (auxiliary machine), 21b ... upper end part (upper end part of auxiliary machine), 25 ... surge tank , 26 ... Intake pipe

Claims (5)

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 includes a large diameter portion having a large cross-sectional area formed from the inner diameter dimension of the intercooler outlet pipe, and a small diameter section having a smaller cross-sectional area formed from the inner diameter dimension than the large diameter section. Configured,
The small diameter portion is formed from an upstream end connected to the air outlet pipe portion of the intercooler outlet pipe to a central portion in the length direction of the intercooler outlet pipe.
The intake device for an internal combustion engine with a supercharger, wherein the large-diameter portion is formed between the central portion in the longitudinal direction of the intercooler outlet pipe and a downstream end connected to the intake intake 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.   3. The intake device for an internal combustion engine with a supercharger according to claim 2, wherein an inner diameter dimension of the large diameter portion is the same in a 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.

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