JP7316509B2 - engine intake system - Google Patents

Description

The present invention relates to an intake system for an engine.

A vehicle front structure is known in which the front side of an engine room that houses an engine is open. According to this structure, the engine cooling water flowing through the radiator arranged in front of the engine can be cooled by the vehicle running wind introduced from the opening on the front side of the engine room. Here, an intake device is known in which an intake port of an intake passage for introducing air into an engine is provided forward of a radiator. This intake system is effective in lowering the temperature of the intake air of the engine because it is possible to introduce cold air in front of the radiator into the engine.

For example, Patent Literature 1 discloses an invention relating to an intake intake structure for an engine. In this intake structure, an intake port of an intake passage leading to an air cleaner of the engine is disposed forward of the radiator, and a bypass passage is provided from the intake passage between the intake port and the air cleaner. A bypass passage leads into the radiator fan shroud.

According to such a configuration, the air in the bypass passage is sucked toward the fan by the radiator fan. The inside of the intake port becomes negative pressure, and the air in front of the radiator is actively sucked. Therefore, a larger amount of the air in front of the radiator, which is cooler than the air in the rear of the radiator, can be sucked and utilized.

JP 2018-105267 A

In the structure of Patent Document 1, the intake port of the intake passage is provided in front of the radiator, and therefore is positioned closer to the opening on the front side of the engine room than in the case where it is provided in the rear of the radiator. . Therefore, foreign matter such as snow and dust contained in the air (hereinafter simply referred to as foreign matter) that enters the engine room from the opening on the front side of the engine room is taken from the intake port provided in front of the radiator. There is a risk of intrusion into the aisle.

As a result, foreign matter may enter the air cleaner provided in the middle of the intake passage, and the foreign matter may accumulate inside the air cleaner or clog the air filter. These cause a decrease in the service life of the air cleaner and a decrease in engine output due to a decrease in the intake air amount of the engine.

The present invention has been made in view of this point, and its main purpose is to introduce cold air in front of the radiator into the engine through the intake passage, while allowing foreign matter such as snow and dust to enter the intake passage. It is to suppress what you do.

The engine air intake device disclosed herein is an air intake device for an engine of a vehicle in which an engine is housed in an engine room that is open on the front side to introduce running wind, and the engine room is provided with air to the engine. an air intake passage to introduce the air, a wind guide section provided forward of the radiator disposed in front of the engine and introducing running wind to the radiator side, and a rear portion of the wind guide section in the longitudinal direction of the vehicle. an air intake volume adjustment device for adjusting the air volume of the running air; an intake port for introducing air into the intake passage is provided at an upstream end of the intake passage; The entrance faces the inside of the air guide section.

According to this configuration, since the intake port faces the inside of the air guide section provided in front of the radiator, cold air can be introduced into the engine. The internal pressure in the air guide portion can be adjusted by adjusting the air guide amount of the vehicle running wind that flows backward with the air guide volume adjusting device. By increasing the internal pressure in the air guide section, the inflow of air into the air guide section is suppressed. This makes it difficult for foreign matter such as snow and dust contained in the air to enter the air guide section. Therefore, it is possible to prevent foreign matter from entering the air intake passage from the air intake opening facing the air guide portion.

As a result, it is possible to prevent foreign matter from entering the air cleaner provided in the middle of the intake passage. As a result, it is possible to prevent foreign matters from accumulating inside the air cleaner and from clogging the air filter. Therefore, it is possible to suppress a decrease in the engine output due to a decrease in the life of the air cleaner and a decrease in the intake air amount of the engine.

Furthermore , the air guide section has a duct structure . According to such a configuration, since the air guide space is surrounded by the walls, it is possible to enhance the airtightness in the air guide section and increase the internal pressure.

Further , the air guide section has an upper wall section, a lower wall section, and left and right side wall sections as wall sections that form the upper surface, the lower surface, and the left and right side surfaces of the air guide section, respectively.

According to such a configuration, the structure can be simplified by using a square duct with a rectangular cross section as the air guide section.

In one embodiment, the upper wall portion, the lower wall portion, and the left and right side wall portions each extend forward from the air guidance amount adjusting device.

According to such a configuration, it is possible to reduce the gap in the front-rear direction between the air guide portion and the air guide volume adjusting device. Therefore, it becomes difficult for air to escape from the gap, so that the airtightness in the air guide portion can be further improved, and the internal pressure can be further increased.

In one embodiment, the intake passage connects to the upper wall.

Of the foreign matter that has entered the air guide section, relatively heavy foreign matter often falls downward due to gravity. According to this configuration, the air intake passage is connected to the upper wall portion located on the side opposite to the direction of gravity (downward), which is the moving direction of the foreign matter. Also, foreign matter can be prevented from entering the intake passage from the intake port.

In one embodiment, the intake passage is provided through the upper wall portion, and the intake port is positioned below the upper wall portion.

Of the foreign substances that have entered the air guide section, relatively light ones may not fall downward due to gravity and may float in the air guide section. These relatively light foreign objects often move along the wall after colliding with the wall and changing direction along the wall. That is, the foreign object collides with the upper wall, changes its direction along the upper wall, and then moves along the upper wall. Therefore, the intake passage is protruded downward through the upper wall portion, and the intake port is positioned below the upper wall portion. As a result, the foreign matter moving along the upper wall part collides with the pipe wall of the intake passage, changes direction along the pipe wall, and then moves downward along the pipe wall. That is, since the foreign matter moves in the opposite direction (downward direction) to the intrusion direction (upward direction) from the intake port, it becomes difficult for the foreign matter to enter the intake passage from the intake port.

In one embodiment, the air intake is bellmouth shaped.

According to this configuration, as described above, the foreign matter moving downward along the wall of the intake passage further moves radially outward of the intake port along the outer wall of the bell mouth portion of the intake port. do. That is, since the foreign matter moves away from the intake port, it becomes more difficult for the foreign matter to enter the intake passage through the intake port.

In one embodiment, the intake passage extends upward from a connection portion with the upper wall portion.

According to such a configuration, if a foreign object enters the intake passage through the intake port, it will flow back to the intake port due to gravity. Therefore, even in the unlikely event that foreign matter enters the intake passage from the intake port, the foreign matter can be removed from the intake passage before it enters the air cleaner provided in the middle of the intake passage.

In one embodiment, the airflow adjustment device is a grille shutter.

According to this configuration, for example, during normal running, by opening the grille shutter, the vehicle running wind can be introduced to the radiator side, and the engine cooling water flowing through the radiator can be cooled. On the other hand, for example, when the engine is warmed up, by closing the grille shutter, it is possible to cut off the introduction of the vehicle running wind to the radiator side and suppress the cooling of the engine cooling water flowing through the radiator.

According to the present invention, it is possible to prevent foreign matter such as snow and dust from entering the intake passage while introducing cold air in front of the radiator into the engine through the intake passage.

FIG. 1 is a front view showing an engine intake system according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the intake device of the engine. FIG. 3 is a plan view showing the intake system of the engine. FIG. 4 is a perspective view showing an air guide duct and a grille shutter. 5 is an enlarged view of the vicinity of the intake port of the intake passage in FIG. 2. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its applicability or its uses.

An engine 2 is housed in an engine room 3 at the front of a vehicle 1 shown in FIG. The engine room 3 has left and right side walls formed by wheel aprons 4 and a rear wall formed by a dash panel 5 that separates the vehicle compartment from the vehicle compartment. An apron reinforcement 6 extending in the longitudinal direction of the vehicle is provided on the upper edge of each of the left and right wheel aprons 4 . Front ends of the left and right apron reinforcements 6 are connected to each other by a cross reinforcement 7 extending in the left-right direction of the vehicle. Note that the cross reinforcement 7 is located forward of the engine 2 . As shown in FIG. 2, the upper surface of the engine room 3 is covered with a bonnet 8. As shown in FIG. A lower surface of the engine room 3 is covered with an undercover 9 . 1 and 2, 10 is an engine cover that covers the engine 2. As shown in FIG.

A front structure of the engine room 3 will be described. As shown in FIG. 1 , upper and lower bumper reinforcements 11 and 12 extending in the left-right direction of the vehicle are provided in front of the cross reinforcement 7 . A frame member 13 extending in the left-right direction of the vehicle is provided above the upper bumper reinforcement 11 . The frame member 13 is fixed to the cross reinforcement 7 with both ends bent backward. A bumper face (not shown) is supported by the bumper reinforcements 11 and 12 .

As shown in FIGS. 1 and 2, the engine room 3 has an opening (hereinafter sometimes referred to as an opening 3a) on the front side to introduce the vehicle running wind. An opening 3a on the front side of the engine room 3 is covered with the bumper face. A front grill (not shown) is provided on the bumper face. In addition, hereinafter, “the outside of the engine room 3 ” refers to the front side of the front opening 3 a of the engine room 3 . "Inside the engine room 3" refers to the area behind the opening 3a.

As shown in FIG. 2 , a radiator 15 is arranged in front of the engine 2 in the engine room 3 . The radiator 15 is positioned near the cross reinforcement 7 in the front-rear direction. Engine cooling water flows through the radiator 15 .

A wind guide section 30 is provided in front of the radiator 15 in the engine room 3 . In the present embodiment, the air guide section 30 has a duct structure (hereinafter sometimes referred to as an air guide duct 30). As shown in FIG. 2, the air guide duct 30 is positioned between the upper and lower bumper reinforcements 11, 12 and the cross reinforcement 7 in the front-rear direction. The air guide duct 30 introduces vehicle running air to the radiator 15 side (engine 2 side). That is, the vehicle running wind is first introduced into the engine room 3 through the front opening 3 a of the engine room 3 . Then, the vehicle running wind passes through the air guide duct 30 and is introduced to the radiator 15 side (engine 2 side). As a result, the vehicle running wind passes through the radiator 15, so that the engine cooling water flowing through the radiator 15 is cooled. The temperature of the vehicle running wind that has passed through the radiator 15 rises due to heat exchange with the engine cooling water that flows through the radiator 15 . That is, in the engine room 3, the air behind the radiator 15 has a higher temperature than the air in front. Therefore, in order to lower the temperature of the air introduced into the engine 2 (intake air temperature), it is desirable to take in the air in front of the radiator 15 as intake air. The details of the structure of the air guide duct 30 will be described later.

As shown in FIG. 2 , a grille shutter 50 as an air guide amount adjusting device is provided at the rear portion of the air guide duct 30 in the engine room 3 in the longitudinal direction of the vehicle. The grille shutter 50 opens and closes the fins to adjust the amount of the vehicle running wind.

As shown in FIG. 3, the engine 2 of the present embodiment is a longitudinal engine in which the cylinder row direction (the longitudinal direction of the crankshaft) extends in the vehicle front-rear direction. The engine 2 is provided with an intake manifold on one side in the left-right direction of the vehicle and an exhaust manifold on the opposite side. Hereinafter, the side of the engine 2 where the intake manifold is provided will be referred to as the intake side (left side of the vehicle), and the side of the engine 2 provided with the exhaust manifold will be referred to as the exhaust side (right side of the vehicle).

In the engine room 3, as shown in FIG. 3, an intake passage 60 for introducing air into the engine 2 is provided as an intake system. An intake duct 61 is provided at the upstream end of the intake passage 60 . The intake duct 61 (intake passage 60) is connected to the air guide duct 30 (see FIG. 2). The details of the connection configuration between the intake duct 61 (intake passage 60) and the air guide duct 30 will be described later. The terms “upstream” and “downstream” are based on the flow direction of the air flowing through the intake passage 60 .

An air cleaner 63 is connected downstream of the intake duct 61 . The air cleaner 63 is arranged on the intake side of the engine 2 . The air cleaner 63 prevents dust from entering the engine 2 by removing dust such as dust contained in the air introduced into the intake passage 60 . Snow that has entered the intake passage 60 is also removed by the air cleaner 63 . The air cleaner 63 has an air filter and a casing that houses it. The air filter traps and removes foreign matter such as snow and dust in the passing air. Foreign matter caught by the air filter either accumulates inside the casing or remains in the air filter.

Downstream of the air cleaner 63, an intake pipe 64 extends rearward of the vehicle beside the engine 2 (intake side). The intake pipe 64 wraps around the rear side of the engine 2 (upper side of the transmission 28 ) and is connected to a turbocharger 65 arranged on the exhaust side of the engine 2 . A supercharging pipe 66 that connects the compressor side of the turbocharger 65 and the intake manifold is provided on the downstream side of the turbocharger 65 . The supercharging pipe 66 extends through the upper side of the engine 2 toward the intake side. Air densified by the compressor of the turbocharger 65 is sent to the intake manifold through the supercharging pipe 66 . Exhaust gas is discharged from the turbine side of the turbocharger 65 . Exhaust gas is sent to the rear of the vehicle through an exhaust pipe 68 through an exhaust gas purification device 67 . Note that the exhaust gas purification device 67 is arranged on the exhaust side of the engine 2 .

Next, the engine intake system according to the embodiment of the present invention will be described in detail. The intake device of the engine includes an air guide duct (air guide section) 30 , a grille shutter (air guide amount adjusting device) 50 , and an intake passage 60 . 4 is a perspective view showing the air guide duct 30 and the grille shutter 50. FIG.

As shown in FIG. 4, the air guide duct (air guide section) 30 has an upper wall section 33 and a lower wall section as wall sections that respectively configure the upper surface, the lower surface, and the left and right side surfaces of the air guide duct 30. 34 and left and right side wall portions 35 . Further, the air guide duct 30 has a rear wall portion 37a as a wall portion forming the upper end portion of the rear surface of the air guide duct 30 (see FIG. 2). The front surface of the air guide duct 30 is not constituted by a wall but is open (front opening 36). A portion of the rear surface of the air guide duct 30 other than the upper end portion (rear wall portion 37a) is not constituted by a wall portion and is open (rear surface opening 37b). The air guide duct 30 (the duct structure of the air guide section) has a rectangular cross section. That is, the air guide duct 30 is a square duct.

Note that the "duct structure" is not limited to a rectangular cross section, and may be, for example, a circular cross section, a trapezoidal cross section, or a triangular cross section. That is, the air guide duct 30 may be a round duct (circular duct), a trapezoidal duct, a triangular duct, or the like. It should be noted that, as in the above embodiment, the structure is simpler when the cross section is rectangular.

The lower wall portion 34 is fixed by a fixture to the lower bumper reinforcement 12 located below the front end portion (see FIG. 2). The side wall portion 35 is provided with a concave portion 43 recessed rearward in the vertical middle portion thereof. The side wall portion 35 is fixed by a fixture to the upper bumper reinforcement 11 that fits into the recess 43 (see FIG. 2). The upper wall portion 33 is fixed to the frame member 13 (see FIG. 1). An oblique bar 45 extends obliquely downward from the upper wall portion 33 . A mounting member 46 is attached to the tip of the oblique bar 45 (see FIG. 2). The mounting member 46 is fixed to the upper bumper reinforcement 11 by a fixture (see FIG. 2). That is, the upper wall portion 33 is fixed to the upper bumper reinforcement 11 via the oblique bar 45 and the mounting member 46 . A through hole 47 for inserting the intake duct 61 of the intake passage 60 is formed in the upper wall portion 33 .

As shown in FIG. 4 , the grille shutter 50 covers the rear portion of the air guide duct 30 in the vehicle front-rear direction. Specifically, the grille shutter 50 is fixed to the rear portion of the air guide duct 30 in the vehicle front-rear direction, and completely covers the rear opening 37b of the air guide duct 30 .

In addition, since the grille shutter 50 is fixed to the rear portion of the air guide duct 30 in the vehicle front-rear direction, the upper wall portion 33, the lower wall portion 34, and the left and right side wall portions 35 of the air guide duct 30 are formed by the grille shutter (the air guide). It can be said that they each extend forward from the air volume adjusting device 50 .

The grille shutter 50 has a rectangular frame-shaped outer frame portion 51 and a cross-shaped inner frame portion 52 provided in the outer frame portion 51 . A window portion 53 formed between the outer frame portion 51 and the inner frame portion 52 is provided with a plurality of fins 54 . The fins 54 are rotatable about a rotating shaft 55 extending in the left-right direction. The fin 54 rotates about the rotation shaft 55 by the operation of the actuator 56 (see FIG. 2). That is, the fin 54 can change its posture between an open posture in which the window portion 53 (rear opening 37b) is opened and a closed posture in which the window portion 53 (rear opening 37b) is closed. Thereby, the grille shutter 50 can be opened and closed. Note that FIG. 4 shows a state in which the grille shutter 50 is open.

The grille shutter 50 serves as an air volume adjustment device, and adjusts the air volume of the vehicle running wind that flows backward. That is, when the grille shutter 50 is in a closed state, the vehicle running wind does not pass through the grille shutter 50 and does not escape rearward. On the other hand, when the grille shutter 50 is open, the vehicle running wind passes through the grille shutter 50 and exits rearward.

Here, when the grille shutter 50 is closed to reduce the amount of guided air from the vehicle running backward, the air stays in the air duct 30 and the internal pressure in the air duct 30 rises. On the other hand, when the grille shutter 50 is opened to increase the amount of the vehicle traveling air that flows backward, almost no air stays in the air guide duct 30, and the internal pressure in the air guide duct does not rise.

That is, the grille shutter 50 can adjust the internal pressure in the air guide duct 30 by adjusting the amount of the air that the vehicle travels.

An intake duct 61 provided at the upstream end of the intake passage 60 is connected to the upper wall portion 33 of the air guide duct 30 . Specifically, the intake duct 61 is vertically inserted through the through hole 47 of the upper wall portion 33 . That is, the air intake duct 61 (air intake passage 60 ) is provided through the upper wall portion 33 . An intake port 62 that introduces air into the intake duct 61 (intake passage 60) opens at the upstream end of the intake duct 61 in the intake passage 60. As shown in FIG. The air intake port 62 is positioned below the upper wall portion 33 and faces the inside of the air guide duct 30 . The air intake port 62 has a bell mouth shape with an opening that expands in diameter toward the end.

As shown in FIG. 2, the intake duct 61 (intake passage 60) extends upward from a connection portion with the upper wall portion 33 and then bends rearward (extends vertically from the upwardly extended portion). Section 69).

As described above, according to this configuration, the air intake port 62 faces the inside of the air guide duct (air guide section) 30 provided forward of the radiator 15 , so cold air can be introduced into the engine 2 . The internal pressure in the air guide duct 30 can be adjusted by adjusting the air guide amount of the vehicle running wind that flows backward through the grille shutter (air guide amount adjusting device) 50 . By increasing the internal pressure in the air guide duct 30, the inflow of air into the air guide duct 30 is suppressed. This makes it difficult for foreign matter such as snow and dust contained in the air to enter the air guide duct 30 . Therefore, foreign matter can be prevented from entering the air intake duct 61 (air intake passage 60 ) from the air intake port 62 facing the air guide duct 30 .

As a result, foreign matter can be prevented from entering the air cleaner 63 provided in the middle of the intake passage 60 (on the downstream side of the intake duct 61). As a result, it is possible to prevent foreign matter from accumulating inside the air cleaner 63 and from clogging the air filter. Therefore, it is possible to suppress the decrease in the engine output due to the decrease in the service life of the air cleaner 63 and the decrease in the intake air amount of the engine.

By making the air guide section 30 a duct structure, the air guide space is surrounded by walls, so that the airtightness inside the air guide duct (air guide section) 30 can be improved, and the internal pressure can be increased.

Furthermore, the structure can be simplified by making the air guide duct (air guide part) 30 a square duct with a rectangular cross section.

A gap in the front-rear direction between the air guide duct (air guide section) 30 and the grille shutter (air guide amount adjusting device) 50 can be reduced. Therefore, it becomes difficult for air to escape from the gap, so that the airtightness in the air guide duct 30 can be further improved, and the internal pressure can be further increased.

A relatively heavy foreign matter W1 (hereinafter sometimes referred to as foreign matter W1) among the foreign matter that has entered the air guide duct (air guide portion) 30 may drop downward due to gravity as shown in FIG. many. According to this configuration, the intake duct 61 (intake passage 60) is connected to the upper wall portion 33 located on the side opposite to the gravitational direction (downward), which is the movement direction of the foreign object W1, so that the air intake duct 30 Even if the foreign matter W1 enters inside, it is possible to prevent the foreign matter W1 from entering the air intake duct 61 (intake passage 60) from the air intake port 62.

A relatively light foreign matter W2 (hereinafter sometimes referred to as foreign matter W2) among the foreign matter that has entered the air guide duct 30 (air guide portion) drifts in the air guide duct 30 without falling downward due to gravity. sometimes These relatively light foreign objects W2 often move along the wall after colliding with the wall and changing direction along the wall. That is, in the present embodiment, for example, as shown in FIG. 5, the foreign object W2 collides with the rear wall portion 37a to change its direction along the rear wall portion 37a, and then moves upward along the rear wall portion 37a. move to The same applies when the foreign matter W2 collides with the grille shutter 50. Next, after colliding with the upper wall portion 33 to change direction along the upper wall portion 33 , it moves forward along the upper wall portion 33 . Therefore, the air intake duct 61 (air intake passage 60 ) is protruded downward through the upper wall portion 33 so that the air intake port 62 is positioned below the upper wall portion 33 . As a result, the foreign matter W2 moving along the upper wall portion 33 collides with the pipe wall 61a of the intake duct 61 (intake passage 60), changes its direction along the pipe wall 61a, and then travels along the pipe wall 61a. down. That is, the foreign matter W2 moves in the opposite direction (downward direction) to the intrusion direction (upward direction) from the air intake port 62, so that it is difficult for the foreign matter W2 to enter the air intake duct 61 (intake passage 60) from the air intake port 62.

As described above, the foreign matter W2 moving downward along the pipe wall 61a of the air intake duct 61 (air intake passage 60) moves further along the outer wall 62a of the bell mouth portion of the air intake port 62 and travels along the diameter of the air intake port 62. Move outward. That is, since the foreign matter W2 moves away from the air intake port 62, it becomes more difficult for the foreign matter W2 to enter the air intake duct 61 (air intake passage 60) from the air intake port 62.

If a foreign object enters the intake duct 61 (intake passage 60 ) from the intake port 62 , it will flow back to the intake port 62 due to gravity at the vertically extending portion 69 . Therefore, even in the unlikely event that foreign matter enters the air intake duct 61 (air intake passage 60) from the air intake port 62, the foreign matter may enter the air cleaner 63 provided in the middle of the air intake passage 60 (downstream of the air intake duct 61). Foreign matter can be removed from the intake duct 61 (intake passage 60) before entering.

For example, by opening the grille shutter 50 during normal running, the vehicle running wind can be introduced to the radiator 15 side to cool the engine cooling water flowing through the radiator 15 . On the other hand, for example, when the engine is warmed up, by closing the grille shutter 50, it is possible to block the introduction of the vehicle running wind to the radiator 15 side and suppress the cooling of the engine cooling water flowing through the radiator 15.

Although the present invention has been described in terms of preferred embodiments, such description is not intended to be limiting, and various modifications are of course possible.

The grille shutter (air volume adjustment device) 50 does not need to completely cover the rear opening 37b of the air duct (air guide section) 30 . The rear surface of the air guide duct 30 may have some portions that are not covered by the grille shutter (air guide amount adjusting device) 50 .

As in the above embodiment, the upper wall portion 33, the lower wall portion 34, and the left and right side wall portions 35 of the air guide duct (air guide portion) 30 extend forward from the grille shutter (air guide amount adjusting device) 50, respectively. It doesn't have to be. That is, the grille shutter 50 need not be fixed to the rear part of the air guide duct 30 in the vehicle front-rear direction. As long as the grille shutter 50 is provided behind the air guide duct 30 in the vehicle front-rear direction, there may be some gap in the front-rear direction between the grille shutter 50 and the air guide duct 30 . In order to increase the internal pressure in the air guide duct 30, it is desirable that the gap is as small as possible.

The intake duct 61 (intake passage 60) may be connected not only to the upper wall portion 33 but also to other wall portions such as the lower wall portion 34, the side wall portion 35, or the rear wall portion 37a. Also, the air intake duct 61 (air intake passage 60) may be connected to the grille shutter (airflow adjustment device) 50. As shown in FIG. That is, as long as the air intake port 62 faces the inside of the air guide duct (air guide section) 30, any connection configuration may be used.

The effect of providing the air intake duct 61 (air intake passage 60) through the upper wall portion 33 in the above embodiment is that the air intake duct 61 (air intake passage 60) is located on a wall portion other than the upper wall portion 33 (lower wall portion 34). , side wall portion 35, rear wall portion 37a), or when connected to a grille shutter (air flow adjustment device) 50. The same effect can be obtained by forming the air intake port 62 into a bell mouth shape.

The airflow adjustment device 50 is not limited to the grille shutter. Any configuration is possible as long as it is provided at the rear portion of the air guide duct (air guide portion) 30 in the longitudinal direction of the vehicle, and the internal pressure in the air guide duct 30 can be adjusted by adjusting the amount of wind introduced while the vehicle is running. may be For example, an air guide fan provided at the rear portion of the air guide duct 30 in the vehicle front-rear direction may be used.

The air guide section 30 may not have a duct structure. For example, instead of the lower wall portion 34 , the undercover 9 may constitute the lower portion of the air guide portion 30 . Similarly, instead of the upper wall portion 33 , the bonnet 8 may constitute the upper portion of the air guide portion 30 . In this case, the upper wall portion 33, the lower wall portion 34, and the like for forming the air guide portion 30 into a duct structure (air guide duct) are unnecessary. In other words, there is no need to provide special members for forming the upper wall portion 33 and the lower wall portion 34 . Therefore, the number of parts can be reduced.

As described above, according to the present invention, the cold air in front of the radiator 15 is introduced into the engine 2 through the intake passage 60 to reduce the temperature of the intake air, while removing foreign matter such as snow and dust from the intake port 62 into the intake passage 60. can be prevented from invading

INDUSTRIAL APPLICABILITY The present invention can be applied to an intake device for an engine, and therefore is extremely useful and has high industrial applicability.

W1, 2 Foreign object 2 Engine 3 Engine room 3a Opening 15 Radiator 30 Air guide duct (air guide part)
33 upper wall portion 34 lower wall portion 35 side wall portion 50 grille shutter (air flow adjustment device)
60 intake passage 62 intake port 63 air cleaner

Claims (7)

An air intake device for an engine of a vehicle in which the engine is housed in an engine room with an opening on the front side to introduce running wind,
In the engine room,
an intake passage that introduces air into the engine;
a wind guide portion provided in front of a radiator disposed in front of the engine and for introducing traveling wind toward the radiator;
an air guide volume adjustment device that is provided at a rear portion of the air guide portion in the vehicle front-rear direction and adjusts the air guide volume of the traveling air;
an intake port for introducing air into the intake passage is provided at an upstream end of the intake passage;
The air intake port faces the inside of the air guide section,
The air guide section has a duct structure,
The air guide portion has an upper wall portion, a lower wall portion, and left and right side wall portions as wall portions constituting an upper surface, a lower surface, and left and right side surfaces of the air guide portion, respectively. Device. In claim 1 ,
The air intake device for an engine, wherein the upper wall portion, the lower wall portion, and the left and right side wall portions each extend forward from the air introduction amount adjusting device. In any one of claims 1 or 2 ,
An intake device for an engine, wherein the intake passage is connected to the upper wall portion. In claim 3 ,
The intake passage is provided through the upper wall,
The air intake device for an engine, wherein the intake port is positioned below the upper wall portion. In claim 4 ,
The air intake device for an engine, wherein the air intake has a bell mouth shape. In any one of claims 3 to 5 ,
An intake device for an engine, wherein the intake passage extends upward from a connection portion with the upper wall portion. In any one of claims 1 to 6 ,
An air intake device for an engine, wherein the airflow rate adjusting device is a grille shutter.

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