JPS592974Y2 - Fin structure installed in the cooling air introduction part of automobiles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a fin structure provided in a cooling air introduction section of an automobile.

In recent years, in automobiles, the amount of heat generated by the engine has increased due to measures against exhaust gas, etc., and the load on the radiator has increased in order to reduce the load on the engine and improve engine efficiency.

Generally, when a car is running at low speeds, the cooling capacity of the radiator is largely dependent on the fan, but when the car is running at high speeds,
A lot depends on the driving wind.

Therefore, generally, as shown in FIG. 1a, a plurality of through holes 2. A grille 3 (cooling air introduction section) having fin members 4. . . 4 is provided to take in air from the vehicle and cool the radiator 6 in front of the engine 5.

(For example, see Japanese Patent Application Laid-open No. 51-141117.) However, in this case, the wind pressure distribution in front of the radiator 6 is affected by the bumper 1 and the wind pressure is low in a part of the bumper, as shown in FIG. There is a problem that the front side is not being used effectively.

Furthermore, in recent years, the nose (front part) of automobiles has tended to be lowered for reasons such as reducing aerodynamic resistance during driving, preventing deterioration of driving stability due to increased front wheel lift, and improving styling.

In this case, as shown in Figure 2a, the wind blows from the bumper 1.
A structure in which the cooling air is taken in from the lower cooling air introduction part 7 (only a small amount of running air can be taken in from above the bumper 1).

), therefore, an air scoop 8 is provided at the lower part of the cooling air introduction part 7 in order to take in more running wind, and a fin 9 is installed in order to guide the running wind upward.・・・・・・、9
However, even in this case, as shown in FIG. 2, the wind pressure above the radiator 6 is low, and the front surface of the radiator 6 cannot be used effectively.

This idea was made in view of the above-mentioned conventional problems.Basically, the structure of the fins disposed in the cooling air introduction section provided below the bumper was optimized by optimizing the longitudinal width and angle of inclination. By setting this, the wind pressure in front of the radiator is made almost uniform, and cooling efficiency is greatly improved.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3a, a radiator 6 is arranged behind the cooling air introduction section 7 provided below the bumper 1, and this radiator 6 has an upright shape and its upper part is higher than the upper part of the cooling air introduction section 7. in position.

A plurality of fins 10 a , 10 b , 10 are arranged in multiple stages in the vertical direction of the cooling air introduction section 7 .
C is the width W in the front-rear direction, the upper fin 10a is wide, the lower fin 10C is narrow, the middle fin 10b is formed in the middle, and the inclination angle θ is such that the rear part is upward. The lower fins 10C are small, the upper fins 10a are large, and the middle fins 10b are formed in between.

Note that in this embodiment, each fin member 10a, 10b
, 10C each have a downwardly convex, gently curved shape, and the vertical intervals P, , P2. P3,
The upper part is larger and the lower part is smaller.

Each interval P1. P2. P3 is the frontage ratio H1 in front of the fins 10a, 10b, 10C, as shown in FIG. 3a.
, H2, H3, and the traveling wind trajectory (50 to 100 km/
point H′ where H) intersects with the front of the radiator 6
1°H'2. The ratio of H'3 is H1:H2:H3=H'1
:H'2:H'3, the respective intervals are set.

The aperture ratio H1°H2,Ha is set so that H1>'H2>Ha.

Reference numeral 11 denotes a wind guide plate extending from the upper part of the grill 7 to the upper part of the radiator 6, which is provided to smooth the flow of the traveling wind and improve the effect of introducing the traveling wind to the upper side of the radiator 6. .

12 is an air scoop provided at the lower part of the cooling air introduction part 7, and 13 is a fan shroud that surrounds the fan 14.

Thus, each fin 10 a , 10 b , 10 C
By extending the upper fin member rearward and increasing the inclination angle as described above, the cooling air above the cooling air introduction section 7 is guided by each fin member and smoothly introduced into the upper side of the radiator 6. It becomes like this.

That is, since the upper part of the radiator 6 is far from the cooling air introduction part 7, by making the upper fins longer, the cooling air can be reliably guided, and the wind pressure in front of the radiator 6 is averaged.

Further, by increasing the distance between the fins loa, 10b, and 10c in the upper part according to the frontage ratio H1°H2, H3, a large amount of cooling air can be introduced into the upper part of the radiator 6.

In this case, since the lower part of the radiator 6 is close to the cooling air introduction part 7, sufficient cooling can be achieved even if the interval is made small and the amount of cooling air introduced is reduced.

In this embodiment, each fin member 10a, 10b, I
Since each OC has a gently curved shape downward, the cooling air flows smoothly without generating turbulence, and furthermore, since each interval Pi, P2゜P3 is set as above, it is even more effective. This is intended to equalize wind pressure.

FIG. 3 is a graph showing the wind pressure characteristics in front of the radiator 6 in the structure of FIG. 3a.

FIG. 4 shows another embodiment, which is basically the same as the embodiment shown in FIG. This is intended to ensure a smooth flow of wind (to prevent turbulence).

In Figure 5, the conventional type shown in Figure 1a is shown by a chain double-dashed line with X marks, the conventional type shown in Figure 2a is shown by a broken line with white circles, and the solid line with black circles is shown in Figure 5. The experimental results of the wind pressure distribution of the proposed type shown in FIG. 3a are shown in comparison.

According to this, it is clear that the wind pressure distribution is almost uniform.

FIG. 6a, FIG. 6S, and FIG. 6C show still other embodiments, in which an opening 16 provided in the bonnet 15,
A duct 18 communicates with the opening 17 provided in the air guide plate 11, and the duct 18 is provided with a shutter 19 that is controlled to open and close manually or by an outside temperature sensor, engine room temperature, and cooling water temperature. It is something.

In this way, when the shutter 19 is closed, the wind flows along the wind guide plate 11 as shown by the two-dot chain line and is guided to the upper part of the radiator 6. If the radiator 6 does not need much cooling air, opening the shutter 19 causes the airflow to "separate" from the baffle plate 11, becoming turbulent as shown by the solid line, and cooling the upper part of the radiator 6. It will no longer be done.

Therefore, it is possible to always maintain optimal cooling efficiency.

As is clear from the above explanation, this idea is to increase the width of the plurality of fin members disposed in the cooling air introduction section below the bumper in the upper part, and to increase the inclination angle in the upper part. Since it is formed to be relatively large, the wind pressure distribution in front of the radiator can be almost averaged, and the radiator surface can be used effectively, greatly improving cooling performance.

Additionally, in some cases, it is possible to eliminate the cooling air introduction section above the bumper, which improves the aerodynamic characteristics of the vehicle.
At the same time, it gives you more freedom in design and allows you to improve your style.

[Brief explanation of the drawing]

Fig. 1a is a longitudinal cross-sectional view of a conventional fin device, Fig. 1 is a wind pressure distribution diagram of the fin structure of Fig. 1a, Fig. 2a is a longitudinal cross-sectional view of a conventional fin structure, and Fig. 2 is a wind pressure distribution diagram of the fin structure of Fig. 1a. Figure 2a is a wind pressure distribution diagram of the fin structure, Figure 3a is a longitudinal sectional view of the fin structure according to this invention, Figure 3 is a wind pressure distribution diagram of the fin structure of Figure 3a, and Figure 4 is a typical A vertical cross-sectional view of the fin structure, Figure 5 is the first
Figure b is a comparison diagram showing experimental results of wind pressure distribution in Figures 2 and 3. Figure 6 a is a vertical cross-sectional view of a fin structure with a duct with a shutter. FIG. 6C is a perspective view showing the shutter, and FIG. 6C is an enlarged sectional view of the duct portion. 1... Bumper, 6... Radiator,
7... Cooling air introduction section, 10a, 10b
, 10 C...Fin, 11...Wind guide plate, W...Width, θ...Inclination angle, P1
~P3... Interval.

Claims (3)

[Scope of utility model registration request] (1) A cooling air introduction part formed below a bumper attached to the front part of an automobile body, and a radiator provided behind this cooling air introduction part, the upper part of which is located higher than the upper part of this introduction part. In an automobile equipped with a plurality of fin members extending in the vehicle width direction and arranged in the vertical direction, the rear part of which is inclined upwardly, each of the above-mentioned fin members has a width in the front-rear direction, an upper fin member is wide, and a lower fin member is wide. A fin structure provided in a cooling air introduction section of an automobile, characterized in that the fin members are narrowly formed, and the inclination angle of each fin member is small for the lower fin members and larger for the upper fin members. (2) The above-mentioned fin members are provided in a cooling air introduction section of a motor vehicle according to claim 1, wherein the distance between the fin members in the vertical direction is larger in the upper part and smaller in the lower part. Fin structure. (3) A fin structure provided in a cooling air introduction section of an automobile according to claim 1, wherein each of the fin members has a downwardly convex curved shape.