JPS621089B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is installed at the rear of the radiator,
Regarding a radiator shroud for efficiently guiding air passing through the core of the radiator to an intake fan, this radiator has a through hole with a damper that can be opened and closed to prevent the shroud from creating resistance, especially when driving at high speeds. The purpose of the present invention is to provide a shroud for use in a vehicle and a method for manufacturing the same.

In order to efficiently guide air passing through the core of a radiator toward an intake fan, it is common practice to provide a shroud behind the core of the radiator. However, such shrouds are effective when the car is stationary or running at low speeds, but when the car is running at high speeds, a large amount of ram pressure is applied to the radiator core. If air is being fed into the shroud, the shroud, which has an opening only at the intake fan, will actually act as a resistance to ventilation, reducing the heat dissipation efficiency of the radiator.

In order to prevent such inconveniences, conventional shrouds have been devised in which a through hole is bored in the wall of the shroud, and the through hole is covered with a damper that can be opened and closed, and the damper is opened by ram pressure when driving at high speeds. has been done. However, in the past, such shrouds required a damper made of a rubber plate or the like to be attached to the through hole of the shroud using parts such as screws, which resulted in a large number of parts, making the parts management and manufacturing process troublesome and expensive. Not only that, the rubber plate damper is easily deformed by heat, and if it is deformed, the adhesion between the damper and the shroud wall will deteriorate, reducing the heat dissipation performance of the radiator when driving at low speeds. .

The present invention aims to provide a radiator shroud that eliminates the above-mentioned drawbacks and a method for manufacturing the same.

Hereinafter, the present invention will be explained with reference to drawings showing examples.

FIG. 1 shows an embodiment of a radiator shroud according to the invention. A cylindrical wall 4 in which an intake fan 3 can be rotatably housed on one side of a back plate 2a of a box-shaped main body 2 with an open front and flanges 1, 1 for attachment to a radiator on both sides.
A ventilation hole 5 is formed. A plurality of through holes 7, 7 in which dampers 6, 6 which can be opened and closed are provided are formed on the other side of the back plate 2a. Each damper 6, 6 is formed integrally with the main body 2 of the shroud from synthetic resin, and is formed into a rectangular flat plate shape as a whole, and has a thin wall portion 8 at the upper side as shown in FIGS. 2 and 3. It is continuous with the back plate 2a. Each damper 6, 6 is located on the same plane as the back plate 2a when the interior of the main body 2 of the shroud is at negative pressure or atmospheric pressure due to the rotation of the intake fan 3 when the vehicle is stopped or running at low speed. A resilient force is applied in the direction of arrow a in FIGS. 2 and 3 so as to close the holes 7, 7. In addition, due to the negative pressure inside the main body 2 of the shroud and the elasticity applied to the damper 6, the lower side of the damper 6 opposite to the thin wall portion 8 moves into the main body 2 to prevent the damper 6 from entering the main body 2. A stopper is provided to prevent this from happening. FIG. 2 shows the first example, in which the main body 2 is attached to the lower edge of the through hole 7.
A stepped portion 9 having an L-shaped cross section is formed toward the inside of the main body 2 to prevent the damper 6 from entering into the main body 2. FIG. 3 shows a second example of the stopper, with the damper 6
A step portion 9a having an L-shaped cross section is formed on the outside of the lower edge of the damper 6 to prevent the damper 6 from entering the main body 2.

As described above, the radiator shroud having the through hole 7 and the damper 6 for opening and closing the through hole 7 is manufactured by integral molding of synthetic resin, and the manufacturing method thereof will be described below. In addition, a ventilation hole 5 having a cylindrical wall 4 around it and flanges 1, 1 on both sides of the main body 2
can be manufactured as is by conventional injection molding, which has been widely used in the past, so the following description will focus on the manufacturing method of the through hole 7 portion that is opened and closed by the damper 6.

As shown in Figs. 2 and 3, it is actually impossible to integrally mold the shroud with the damper 6 blocking the through hole 7, and even if it were possible, each damper should be oriented in the direction of the arrow a. It is not possible to impart elasticity to the thin wall portion 8 to allow it to dodge, unless separate parts such as springs are used. Therefore, in the present invention, the damper 6, the through hole 7, and the stepped portion 9 are integrally molded from synthetic resin so that the damper 6 is inserted into the inside of the main body 2, as shown in FIG. After molding into the state shown in FIG. 4, while elastically deforming the damper 6 so that its cross section becomes an arc shape,
right side of the figure), and the lower edge of the damper 6 is pushed out to the step 9.
When the damper 6 is released from the hand pushing the damper 6 after passing through, the damper 6 returns to its flat shape and its lower edge comes into elastic contact with the outer surface of the stepped portion 9. That is, the damper 6 is in the state shown by the solid line in FIG. 2, but because the damper 6 always tries to return to the state at the time of molding (the state shown in FIG. 4) due to the elasticity of the synthetic resin itself, the arrow in FIG. An elastic force is applied in the direction indicated by a, and the lower edge of the damper 6 remains in elastic contact with the front surface of the stepped portion 9 unless a force is applied to the front surface (left surface) of the damper. Above, we have explained the manufacturing method for the structure shown in Fig. 2.
As shown in the figure, a structure in which a stepped portion 9a is formed on the damper side can also be manufactured in the same manner.

The radiator shroud constructed and manufactured as described above is attached to the rear of the radiator core like a normal shroud, and is used with the intake fan 3 installed inside the cylindrical wall 4, but it is used in automobiles. When the is stopped or running at low speed, each of the ventilation holes 7, 7 is blocked by the dampers 6, 6, and all the air that has passed through the core is sucked into the intake fan 3 and flows through the ventilation holes. Pass 5. As the car begins to run at high speed, the amount of air passing through the core increases due to ram pressure, and when the intake fan 3 cannot handle the amount of air, the pressure inside the shroud body 2 increases, causing the air to pass through the core. Pressure pushes each through hole 7,
The dampers 6, 6 of 7 open as shown by the chain lines in FIGS. 2 and 3, and the air flows out of the main body 2 through the through holes 7, 7, so that the shroud acts as a resistance for the air passing through the core. prevent it from happening.

As described above, the radiator shroud and its manufacturing method of the present invention greatly reduce the number of parts of the shroud that can provide optimal ventilation conditions depending on the situation, and enable integral molding from synthetic resin. This has the effect of reducing man-hours, simplifying parts management, and making it possible to manufacture at low cost.

In addition, in the illustrated example, the ventilation hole 5 is provided on one side of the back plate 2a of the box-shaped shroud main body 2, but in the shroud of the present invention, the ventilation hole 5 is located in the center, and the ventilation hole 5 is located on both sides. Through holes 7, 7 can also be provided. Further, the present invention can also be applied to a device in which the main body 2 is formed into a roughly funnel shape with a ventilation hole 5 in the center.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the overall structure, and FIGS. 2 and 3 are enlarged views of FIG. 1 showing two examples of through holes provided with dampers. -A sectional view and FIG. 4 are sectional views similar to FIGS. 2 and 3, showing the state of the damper immediately after molding. 1: flange, 2: main body, 2a: back plate, 3: intake fan, 4: cylindrical wall, 5: ventilation hole, 6: damper, 7: through hole, 8: thin wall portion, 9, 9a: step portion.

Claims (1)

[Scope of Claims] 1. In a radiator shroud having a ventilation hole 5 in which an intake fan 3 can be rotatably inserted into the back plate 2a, one side is thinned in a portion of the back plate 2a that is outside the ventilation hole 5. It is continuous with the back plate 2a via the part 8,
A damper 6 that is elastically directed forward and is integrally molded with the back plate 2a from synthetic resin forms a through hole 7 that can be opened and closed freely, and the damper 6 is a stopper that prevents the damper 6 from entering the main body 2. A shroud for a radiator, characterized in that it is integrally formed on at least one side of a back plate 2a. 2. In a radiator shroud having a ventilation hole 5 into which the intake fan 3 can be rotatably inserted into the back plate 2a, one side of the back plate 2a is inserted through the thin wall part 8 into the part of the back plate 2a that is out of the ventilation hole 5. Continuing with plate 2a,
A damper 6 that is elastically directed forward and is integrally molded with the back plate 2a from synthetic resin forms a through hole 7 that can be opened and closed freely, and the damper 6 is a stopper that prevents the damper 6 from entering the main body 2. A method for manufacturing a radiator shroud which is formed integrally with at least one side of the back plate 2a, wherein the entire shroud is integrally molded from synthetic resin with the damper 6 inserted inside the main body 2. A method of manufacturing a shroud for a radiator, which comprises pushing the damper 6 out of the main body 2 beyond a stopper while elastically deforming the damper 6.