JPH064030Y2 - External air introduction duct structure for intercooler cooling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a cooling outside air introduction duct structure of an intercooler for introducing cooling outside air into an intercooler mounted in an engine room of an automobile.

2. Description of the Related Art Among conventional automobiles, for automobiles equipped with a turbocharged engine, for example, MAZDA Luce Service Manual P.P. issued by Toyo Kogyo Co., Ltd. in September 1986. As shown in FIG. 14, an intercooler interposed in the middle of the intake duct of the engine is arranged close to the engine hood, while an outside air introduction duct is arranged on the back surface of the engine hood to keep outside air out. The intercooler is actively introduced to cool it.

Problems to be solved by the invention Since the outside air introduction duct has a so-called single duct structure that opens at the upper part of the intercooler and at the back of the radiator grill, the outside air opening at the back of the radiator grill must be increased in order to increase the amount of intake of outside air. It is necessary to increase the opening area of the intake. However, because various functional parts such as radiator, cooler condenser, and hood lock are mounted on the front side of the engine room, the opening area of the outside air intake cannot be set unnecessarily large and therefore the outside air intake There was naturally a limit to the amount that could be received. Further, since the outside air introducing duct is in communication with the intercooler in a mounted state through the seal member, the engine hood vibrates in the twisting direction due to the engine vibration input to the outside air introducing duct through the intercooler, and a rattling noise is generated. It causes a defect. Therefore, the present invention can increase the intake amount of the outside air for cooling into the intercooler without disturbing the layout of various functional parts in the engine room, and moreover, can prevent the engine hood from twisting due to engine vibration. (EN) An outside air introducing duct structure for cooling an intercooler capable of reliably suppressing vibration.

On the back of the engine hood, a branch duct that extends from the front end of the branch to both sides of the front of the vehicle and has a branch duct that communicates with the intercooler in the engine room in pressure contact when the engine hood is closed. A structure of an outside air introduction duct, in which the outside air intake opening to the back of the radiator grill is provided at each tip of the branch portion of the branch duct, and the outside air intake is provided on at least both sides of the radiator grille. A lower air guide and an upper air guide which is provided at each end of the branch portion of the branch duct and communicates with the lower air guide in a pressure contact state when the engine hood is closed.

Part of the outside air that has passed through the radiator grille is captured by the outside air intakes on both sides of the vehicle body, and is introduced from the outside air intakes through the branch portions of the branch ducts into the intercooler. Further, the load input to the collecting portion of the branch duct through the intercooler is dispersed and supported by the lower air guide provided on the radiator grill, via the upper air guide at the tip of the branch portion.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, 1 denotes an engine room, which is mounted in the engine room 1 and above the engine 2.
An intercooler 4 provided in the middle of an intake duct 3 of the engine 2 is arranged close to an engine hood 5. On the other hand, an outside air introduction duct 8 for introducing outside air for cooling is provided in the intercooler 4 from the back surface of the engine hood 5 to the back portion of the radiator grill 18.
The outside air introducing duct 8 is provided with a bifurcated branch duct 9 having a branch portion 9a whose tip extends to both front sides of the vehicle body, and an outside air introducing port 10 arranged at each tip of the branch portion 9a of the branch duct 9. An opening 14 is formed in a portion of the lower wall of the collecting portion 13 of the branch duct 9 directly above the intercooler 4. The above-mentioned outside air intake 10 is specifically provided integrally on both back sides of the radiator grill 18, and captures a part of the outside air passing through the radiator grill 18 to circulate the outside air upward. The upper air guide 12 is fitted and connected to the tip of each branch portion 9a of the branch duct 9 and communicates with the lower air guide 11 in a pressure contact state when the engine hood 5 is closed. The guide 12 is fixed to the upper edge of the communication port 7 formed in a portion of the front edge of the hood inner 6 that matches the lower air guide 11 so as to surround the communication port 7.
A seal member that seals between the opening 14 and the intercooler 4 and between the communication port 7 and the lower air guide 11 when the engine hood 5 is closed, on the lower peripheral edge of the opening 14 and the communication port 7 described above. 15 and 16 are attached. Reference numeral 17 is a retainer for fixing the seal member 15.
A straightening vane 19 is integrally formed in the branch duct 9 in the front-rear direction from the base end of the branch part 9a to the collecting part 13 so that the outside air flowing in each branch part 9a of the branch duct 9 is discharged. The straightening plate 19 allows the collecting portion 13 to straighten and guide in the axial direction of the collecting portion 13. Two
Reference numeral 0 indicates a condenser for a cooler, and reference numeral 21 indicates a radiator grill. The hood inner 6 has a portion that interferes with the branch duct 9 cut out to bring the branch duct 9 as close as possible to the back surface of the engine hood 5 to prevent the hood from becoming higher. Then, the branch duct 9 is attached near the cutout portion of the hood inner 6 via the retainer 22, so that the retainer 22 also serves to reinforce the cutout portion of the hood inner 6.

According to the above-described embodiment structure, a part of the outside air communicating with the radiator grille 18 when the vehicle is traveling is captured by the lower air guides 11 on both sides of the radiator grille 18 and guided upward by inflow. It The outside air captured by the lower air guide 11 flows through the communication port 7 and the upper air guide 12 in each branch portion 9a of the branch duct 9 and reaches the collecting portion 13. In this collecting unit 13, the branching unit 9a
Since the current plate 19 extends in the front-back direction from the base end of
The outside air flowing from each branching portion 9a is deflected by the straightening plate 19 and is straightened and guided in the axial direction of the collecting portion 13, and is smoothly introduced into the intercooler 4 through the opening portion 14 without interfering with each other and generating a turbulent flow. To be done. As described above, since the outside air intakes 10 communicating with the bifurcated branch duct 9 are opened at the back portions of the radiator grill 18 on both sides of the radiator grill 18 where space is relatively easy to take, various functional parts in the engine room 1 are provided. The total opening area can be increased without affecting the layout of
In the collecting portion 13, the straightening vanes 19 can avoid the mutual interference of the outside air flowing from the respective branch portions 9a and smoothly introduce the outside air into the intercooler 4 from the opening portion 14, so that the intake amount of the outside air can be increased. Thus, the cooling effect of the intercooler 4 can be further enhanced.

FIGS. 3 and 4 are explanatory views showing the effect of the wind speed experiment passing through the core 4a of the intercooler 4, and the vehicle speed is 60%.
The wind velocity (unit: m / s) passing through the core of km / h was measured at the center of each divided area obtained by dividing the core 4a into four parts. It can be seen that in the case where the current plate 19 is additionally provided, the passing wind speed at the center of each divided area is increasing.

The rectifying plate 19 has a gathering portion 13 as shown by a chain line in FIG.
It may be extended to the rear wall so that the collecting portion 13 is completely divided into two.

Moreover, according to this outside air introduction duct structure, the outside air intake 1
Each of the upper air guides 12 constituting 0 connects to the lower air guides 11 on both sides of the radiator grille 18 in a pressure contact state when the engine hood 5 is closed.
The load in the twisting direction input to is distributed and supported on both sides of the radiator grill 18 via the upper air guide 12 and the lower air guide 11 at the tip of the branch portion 9a. For this reason,
The branch duct 9 has high torsional rigidity in the vehicle body width direction when the engine hood 5 is closed, and can reliably suppress vibration in the torsional direction of the engine hood 5 due to engine vibration.

In the embodiment shown in FIG. 5, a cushioning material 20 is interposed between the outside air introducing duct 8 and the engine hood 5. According to this embodiment, the outside air introducing duct 8 can be brought into close contact with the rear surface of the engine hood 5 via the cushioning member 20,
The surface rigidity of the engine hood 5 can be increased, and
The cushioning material 20 can suppress the vibration of the outside air introducing duct 8 from being transmitted to the engine hood 5, and can also prevent the generation of abnormal noise. The upper surface of the collecting portion 13 of the outside air introducing duct 8 facing the opening 14 communicating with the intercooler 4 has a flat plate shape, and the presence of the flow straightening plate 19 ensures the rigidity of the upper surface of the collecting portion. Further, due to the heat insulating effect of the cushioning material 20, the radiant heat of the engine hood 5 due to the sun rays can be blocked from being transmitted to the outside air introducing duct 8, and the outside air can be introduced into the intercooler 4 without being warmed, so that the cooling effect can be enhanced.

As described above, according to the present invention, since the branch portion of the branch duct of the outside air introduction duct is provided and the outside air inlet at each tip thereof is opened to the back of the radiator grill, various functional parts of the engine room front portion are provided. The total opening area of the outside air intake can be increased without hindering the layout of the engine, the lower air guide that constitutes the outside air intake is provided on the back of the radiator grill, and the upper guide is used when closing the engine hood. Since it is in pressure contact with the air guide, it is possible to efficiently introduce only the outside air into the intercooler without trapping the warm air in the engine room, thus further improving the cooling efficiency of the intercooler. It has a practically great effect of being able to.

In addition, the outside air intake is connected to the lower air guides provided on the backs on both sides of the radiator grille, and the upper air guides that are provided at the ends of the branch duct branch and communicate with the lower air guides when the engine hood is closed. The load input to the branch duct assembly through the intercooler is distributed and supported by the lower air guide on the radiator grill side via the upper air guide at the tip of the branch duct. This also has the effect of suppressing the occurrence of torsional vibration of the engine hood due to engine vibration.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view showing an embodiment of the present invention, FIG. 2 is a schematic sectional view of the same, and FIGS. 3 and 4 are explanatory drawings showing experimental data of wind velocity passing through an intercooler core. FIG. 5 is a schematic sectional view showing a different example of the present invention. DESCRIPTION OF SYMBOLS 1 ... Engine room, 4 ... Intercooler, 5 ... Engine hood, 8 ... Outside air introduction duct, 9 ... Branch duct, 9a ... Branch part, 10 ... Outside air intake, 13 ... Collecting part,
18 ... Radiator grill.

Claims (1)

[Scope of utility model registration request] 1. A branch duct is provided on the rear surface of the engine hood, the tip of the branch portion extending to both front sides of the vehicle body, and the collecting portion being in pressure contact with an intercooler in the engine room when the engine hood is closed. A structure of an outside air introduction duct in which an outside air intake opening to the back of the radiator grill is arranged at each end of the branch portion of the branch duct, wherein the outside air intake is provided on at least both sides of the radiator grill. An outside air introducing duct structure for cooling an intercooler, comprising: a guide and an upper air guide which is provided at each end of a branch portion of the branch duct and communicates with the lower air guide in a pressure contact state when the engine hood is closed.