JP2020117125A - Vehicle intake structure - Google Patents

Abstract

To allow mixing of droplets into an intake system to be inhibited.SOLUTION: A radiator 20 is disposed so as to be spaced apart rearward from a front grille 10. An intake air guide duct 30 is disposed above the radiator 20 and protrudes forward farther than the radiator 20. A front end of the air guide duct 30 is provided with an inflow port 38 opening downward. Further, a partition wall 36A is provided that is spaced apart downward from the inflow port 38 and faces the inflow port 38.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle intake structure.

Part of the air that has entered the engine room (also called the engine compartment) from the front grill of the vehicle flows into the radiator, and the other part flows into the intake system of the internal combustion engine. For example, an air guide duct, which is the upstream end of the intake system, is provided above the radiator. The air guide duct projects forward of the radiator, and an inlet opening downward is provided at the front end of the air guide duct.

Foreign matter such as dust may be mixed in the air that has flowed into the engine room (hereinafter referred to as inflow air as appropriate), and if it enters the intake system, it may cause clogging or combustion failure of the internal combustion engine. There is. Therefore, in Patent Document 1, a comb-shaped strainer (crosspiece) that separates air and foreign matter is provided at the inlet of the air duct.

JP, 2017-43316, A

By the way, when it rains or snows, the inflow air contains water and snow. As illustrated in FIG. 8, the droplet 102 that has passed through the front grill 100 rides on the air flow and bounces off in front of the radiator 104. The bounced liquid droplets 102 ride on the airflow toward the air guide duct 106 and are wound up to the inflow port 108.

As described above, since the strainer 110 is provided at the inflow port 108, the droplet 102 is once attached to the strainer 110. Then, part of the water accumulated in the strainer 110 may get on the air current and enter the depth of the strainer 110, that is, the inlet pipe 112 side of the air cleaner.

Therefore, it is an object of the present invention to provide an intake structure for a vehicle that can suppress the mixture of droplets into the intake system.

The present invention relates to a vehicle intake structure. The structure includes a radiator and a wind guide duct. The radiator is spaced apart rearward from the front grill. The air guide duct is for intake, is arranged above the radiator, and projects forward from the radiator. An inlet opening downward is provided at the front end of the air duct. Further, a partition wall is provided so as to be spaced downward from the inflow port and faces the inflow port.

According to the above configuration, the liquid droplets bounced from the radiator hit the partition wall provided below the inflow port of the air guide duct, so that the inflow of the liquid droplets into the inflow port is suppressed.

According to the present invention, it is possible to suppress the mixing of liquid droplets into the intake system.

It is a side surface sectional view which illustrates the intake structure of the vehicle concerning this embodiment. It is a perspective view which illustrates a wind guide duct. It is an exploded perspective view which illustrates the component of a wind guide duct. It is a perspective view explaining the strainer structure of a wind guide duct. FIG. 3 is a sectional view taken along line AA of FIG. 2. It is a side sectional view explaining the flow of intake air. FIG. 7 is a side sectional view showing another example of the intake structure for a vehicle according to the present embodiment. It is a side sectional view which illustrates the intake structure of the vehicle concerning a prior art.

FIG. 1 illustrates an intake structure for a vehicle according to this embodiment. 1 to 7, the vehicle body front-rear direction is indicated by the axis indicated by the symbol FR, the vehicle width direction is indicated by the symbol RW, and the vehicle height direction is indicated by the symbol UP. Indicated by. The front-rear direction of the vehicle body FR is the forward direction. The vehicle width axis RW has a rightward width direction as a positive direction. In addition, the vehicle height axis UP is upward in the forward direction. These three axes are orthogonal to each other. In addition, hereinafter, the front of the vehicle body and the rear of the vehicle body will be simply referred to as front and rear, and the vehicle height direction upper side and the vehicle height direction lower side will be simply referred to as upper and lower.

FIG. 1 illustrates a side sectional view of a front portion of an engine room of a vehicle including an intake structure for a vehicle according to the present embodiment. The engine room is also called an engine compartment, and an internal combustion engine (not shown) is mounted behind the room.

The front end of the engine room is the front end of the vehicle, and the front grill 10 is provided at that location. The front grill 10 is attached to the front bumper 60. The front grill 10 is a lattice or mesh member, and the air outside the vehicle flows into the engine compartment through the front grill 10.

A radiator 20 is provided so as to be separated from the front grill 10 rearward (that is, on the rear side of the vehicle body). Further, a radiator fan 22 is provided behind the radiator 20. For example, the radiator 20 is a rectangular member that is long in the vehicle width direction when viewed from the front, and is provided with a large number of pipes through which the refrigerant flows.

The radiator 20 is supported on the vehicle body by a radiator support 24. The radiator support 24 is a frame body that surrounds the outer edge of the radiator 20 having a rectangular shape in a front view. For example, the lower end thereof is fastened to a front bumper reinforcement (not shown) that is a frame member of the vehicle.

An air guide duct 30 for intake is provided above the radiator 20. The air guide duct 30 is a front end part of the intake system, and the intake air taken into the air guide duct 30 is sent to an internal combustion engine (not shown).

The air duct 30 is arranged so as to project (in other words, overhang) forward of the radiator 20. Further, the air guide duct 30 is arranged above the front grill 10. For example, the air that has flowed in from the front grill 10 flows to the rear side of the vehicle body and then changes upward to enter the air duct 30.

The wind guide duct 30 is arranged, for example, behind the emblem 68 at the front end of the vehicle and behind the engine room cover 70 that covers the front end of the engine room. Further, for example, the air guide duct 30 is arranged below the hood inner panel 64 of the bonnet hood 66, and when the bonnet hood 66 is opened, the air guide duct 30 is visible together with the inlet pipe 50.

An inflow port 38 having a downward opening is formed at the front end of the air guide duct 30, that is, at a portion projecting forward of the radiator 20. Further, an outlet 39 is provided at the rear end of the air duct 30. The outflow port 39 is connected to an inlet pipe 50 of an air cleaner (not shown). The inlet pipe 50 extends, for example, on the front side of the drawing, that is, in the forward direction on the RW axis, and is connected to a cleaner box (not shown) of an air cleaner.

FIG. 2 illustrates a single perspective view of the air duct 30. Further, an exploded perspective view of the air duct 30 is illustrated in FIG. The air duct 30 is made of, for example, a molded product made of a resin material. With reference to FIG. 3, the wind guide duct 30 includes a duct upper cover 32, a strainer plate 34, a duct lower cover 36, and a sealing material 37.

FIG. 5 illustrates the AA cross section of FIG. The duct upper cover 32 is a triangular member in a side view, and is open at the lower side and the rear side. The lower opening serves as an inlet 38, and the rear opening serves as an outlet 39. A seal member 37 is provided at the outflow port 39, that is, a connecting portion between the duct upper cover 32 and the inlet pipe 50 (see FIG. 1). Since the sealing material 37 is sandwiched between the duct upper cover 32 and the inlet pipe 50 when connecting to the inlet pipe 50, leakage of intake air is suppressed.

The strainer plate 34 is a flat plate-like member, and an upper strainer 34A and a lower strainer 34B (see FIG. 4), which are comb-shaped strainers, are formed in the front portion thereof. Referring to FIG. 5, the strainer plate 34 is provided so as to cover the inflow port 38 of the duct upper cover 32. Therefore, the intake air flows into the air duct 30 via the upper strainer 34A and the lower strainer 34B of the strainer plate 34.

FIG. 4 illustrates a perspective view of the wind guide duct 30 when the duct upper cover 32 is removed and a part of the front portion of the strainer plate 34 is removed. The strainer plate 34 includes upper and lower two-stage strainers including an upper strainer 34A and a lower strainer 34B.

The upper-stage strainer 34A is formed in a comb shape in which a slot-like opening is formed in the vehicle front-rear direction at intervals in the vehicle width direction. The lower strainer 34B is formed below the upper strainer 34A, and comb teeth extend in the vehicle body front-rear direction at locations corresponding to the openings of the upper strainer 34A.

Further, flanges 34C projecting outward in the vehicle width direction are provided at both ends of the strainer plate 34 in the vehicle width direction. The air guide duct 30 is fastened to the radiator support 24 (see FIG. 1) via the flange 34C.

The lower duct cover 36 is provided below the strainer plate 34. Referring to FIG. 5, the lower front cover 36 of the duct is open, and intake air flows into the inflow port 38 from this open end.

The duct lower cover 36 is provided with a partition wall 36</b>A facing the inflow port 38 and spaced downward from the inflow port 38. The partition wall 36A is arranged so as to separate the radiator 20 and the inflow port 38 from each other, and so-called a so-called partition wall 36A that blocks the inflow of the droplets 80 (see FIG. 6) rising from the radiator 20 into the inflow port 38, as will be described later. Functions as a baffle.

If the partition wall 36A is excessively arranged below, the area under which the lower duct cover 36 covers the front of the radiator 20 expands, and heat exchange by the radiator 20 may be delayed. On the other hand, if the partition wall 36A is excessively close to the inflow port 38, the inflow of intake air may be delayed. In order to maintain both the heat exchange efficiency of the radiator 20 and the securement of intake air, the distance L1 (see FIG. 5) between the inflow port 38 and the partition wall 36A is substantially equal to the opening diameter L2 of the outflow port 39, for example. Is determined to be.

With reference to FIG. 3, the lower duct cover 36 is a dust-like member or a hand-shaped member, and has side walls 36B and 36C provided at both ends in the vehicle width direction and extending in the vehicle height direction, and a side wall 36B. , 36C, and a side wall 36D that is similarly connected to the rear ends and extends in the vehicle height direction. Further, a flat partition wall 36A is connected to the lower ends of the side walls 36B, 36C, 36D. Further, the lower duct cover 36 is provided with a reinforcing rib 36E that connects the side wall 36D and the partition wall 36A.

FIG. 6 illustrates a process in which the inflow air that has passed through the front grille 10 flows into the intake system. Air outside the vehicle flows into the engine room through the front grill 10. A part of this inflowing air flows into the radiator 20, and the other part flows into the intake system.

For example, as the piston in the internal combustion engine descends, negative pressure is generated in the intake pipe upstream thereof. Due to this negative pressure, a part of the air in the engine room is drawn into the air duct 30. For example, as shown by the S-shaped arrow in FIG. 6, a part of the airflow flowing from the front grill 10 to the rear side of the vehicle body changes its direction from the radiator 20 upward.

Here, for example, when it is raining or snowing, rain and snow enter from the front grille 10 along with the air flow. The droplets 80 derived from the rain and snow ride on the air flow and hit the front surface 20A of the radiator 20. Furthermore, the droplet 80 bounces off the front surface 20A of the radiator 20 and rides on the airflow to rise (in other words, is wound up).

A partition wall 36A is provided so as to block the air guide path from the radiator front surface 20A to the air guide duct 30. That is, the partition wall 36A is provided below the inflow port 38 of the air guide duct 30, and the wound droplets 80 hit the partition wall 36A to block the inflow to the inflow port 38. On the other hand, the airflow bypasses the partition wall 36A and flows into the sneak flow inlet 38.

In this manner, in the vehicle intake structure according to the present embodiment, the partition wall 36A facing the inflow port 38 is provided below the inflow port 38, so that the inflow of the droplet 80 into the inflow port 38 is suppressed. To be done.

Further, as illustrated in FIG. 6, the partition wall 36A is arranged so as to be inclined so that the vehicle rear side is at a lower position with respect to the vehicle front side. Therefore, when the droplets collect on the lower surface of the partition wall 36A, the droplets flow to the lower end 36F of the cover in accordance with the inclination of the droplets, and then are dropped. That is, the partition wall 36A is positioned so that the droplets flow on the side separated from the front open end of the lower duct cover 36.

<Another example of a vehicle intake structure according to the present embodiment>
1 to 6, the partition wall 36A is provided as one component of the air guide duct 30, but the configuration is not limited to this. For example, as illustrated in FIG. 7, the radiator support 24 may be provided with a partition wall 96A.

In the intake structure shown in FIG. 7, the duct lower cover 36 is removed from the air guide duct 30 of the intake structure shown in FIGS. 1 to 6 and the radiator support 24 is provided with a partition wall 96A. Other configurations are common to the intake structure of FIG. 7 and the intake structures of FIGS. 1 to 6.

The partition wall 96A is a flat plate member provided below the inflow port 38 of the air guide duct 30 so as to face the inflow port 38. The lower surface of the partition wall 96A is arranged so as to be inclined so that the vehicle rear side is at a lower position with respect to the vehicle front side. Further, a flange 96B fixed to the radiator support 24 is provided at the rear end of the partition wall 96A. Even with such a structure, the partition wall 96A suppresses the inflow of droplets into the inflow port 38.

10 front grille, 20 radiator, 20A radiator front, 24 radiator support, 30 air duct, 32 duct upper cover, 34 strainer plate, 34A upper stage strainer, 34B lower stage strainer, 36 duct lower cover, 36A, 96A bulkhead, 38 inlet , 39 outlets, 80 droplets.

Claims (1)

A radiator that is arranged rearward from the front grill,
An air guide duct for intake, which is arranged above the radiator and projects forward from the radiator,
An intake structure for a vehicle including:
An inlet opening downward is provided at the front end of the air duct.
A partition wall is provided which is spaced downward from the inflow port and faces the inflow port.
Vehicle intake structure.

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