JPH0346178Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fan shroud that is attached to the core surface of a radiator in an automobile, etc., and is used to surround the fan and increase the cooling capacity of the radiator.

(Prior Art) As shown in one example in Japanese Utility Model Application Publication No. 56-20031, this fan shroud consists of a circumferential wall surrounding the fan and a peripheral frame around the fan, and is entirely made of synthetic resin. It is generally obtained by integral molding. In the prior art described above, the centers of the circumferential wall and the peripheral frame are aligned, and the top, bottom, left and right sides are symmetrical, and the peripheral frame can be provided with reinforcing ribs, thereby preventing distortion during molding. It is easy to attach the fan shroud to the radiator without leaving any gaps between them.

However, recently, due to the downsizing of engines and restrictions on the interior of the engine room, efforts have been made to reduce the thickness of fan shrouds and to make radiators more compact. Furthermore, due to engine mounting restrictions, the fan may have to be placed eccentrically from the center of the fan shroud. In order to meet these demands, a fan shroud has been developed in which a part of the circumferential wall surrounding the fan protrudes radially from the peripheral frame, and an extension wall that hangs down toward the radiator core surface is formed on the back of this protrusion. being developed.

(The problem that the invention aims to solve) However, the fan shield with this shape is
Because it is not possible to provide a reinforcing rib on the extension wall c formed on the back surface of the portion (protrusion) b that protrudes in the radial direction from the peripheral frame portion a, due to the need to secure a fan rotation space, the extension wall c shown in FIG. Like, extension wall c
is distorted into an arcuate shape, and a gap e is formed between it and the radiator d, which reduces the cooling effect of the radiator d, and has the disadvantage that the chatter of the extension wall c causes noise generation.

In the present invention, a fan shroud is formed to prevent the above-mentioned distortion from occurring in the extension wall c, thereby improving the drawbacks of the above-mentioned conventional example.

(Means for Solving the Problems) The present invention provides a peripheral frame portion having a flange portion attached to the peripheral portion of the core surface of the radiator, and a circumferential wall surrounding the fan, in which a part of the circumferential wall is connected to the peripheral frame portion. In a fan shroud made of synthetic resin that is integrally formed so as to protrude in the radial direction, an extension wall that covers the back surface of the protruding portion of the circumferential wall is suspended toward the core surface of the radiator, and is attached to the flange portion at both ends. It is characterized in that it is formed so as to be integrally continuous, and that the extension wall is slightly curved and protrudes toward the radiator side with respect to the core surface.

(Embodiment) In the embodiment shown in FIGS. 2 and 3, the extension wall 4 is continuously integrated with the flange portion 8 at both ends thereof, and the extension wall 4 is made to slightly protrude toward the radiator 5 side. (The amount of protrusion is indicated by f.) It is formed in an arc shape. In order to form it in this way, it was found in manufacturing tests that the shape of the cavity in the portion of the molding die that forms the protruding portion 2 must be formed to have a larger protrusion amount than the protrusion amount f. It is becoming clear.

If the amount of protrusion of the cavity is made smaller than that of the above embodiment, the amount of protrusion f of the extension wall 4 will also be reduced, and if the amount of protrusion of the cavity is selected to an appropriate value, the extension wall 4 will be able to cover the core surface of the radiator 5 ( A fan shroud A that is parallel to the shroud mounting surface) 6 can be obtained.

The circumferential wall 1 surrounding the fan has a rectangular peripheral frame 3
It is eccentrically upward relative to the peripheral frame 3, and a portion (protruding portion) 2 thereof protrudes above the peripheral frame portion 3. The extension wall 4, which is formed to hang down in a curved manner on the radiator 5 side of the protrusion 2, is formed as described above.

The peripheral frame portion 3 includes a flange portion 8 and a peripheral wall 9 connecting the flange portion 8 and the circumferential wall 1. Providing reinforcing ribs (not shown) on the peripheral wall 9 is advantageous because it can improve the strength of the fan shroud and reduce distortion during molding.
Further, mounting screw holes 10, 10, . . . are provided on the left and right side edges of the flange portion 8.

The extension wall 4 protrudes toward the radiator 5 in an arc shape when viewed from above, but the flange portion 8
Screw holes 10, 10 for mounting on the left and right side edges of...
By tightening the mounting screws 11, 11, . Therefore, since the extension wall 4 is in close contact with the core surface 6 under pressure, there is no gap between the two that would allow air to leak.
Also, noise due to chatter is no longer generated. It goes without saying that the method for molding the fan shroud is not limited to injection molding, and that other molding methods can also be used.

(Operations and Effects of the Invention) The present invention relates to a fan shroud in which a part of the circumferential wall surrounding the fan protrudes from the peripheral frame (and by extension, the radiator), and the protruding part is an extension formed on the back surface of the fan shroud. Although it is covered with a wall and it is impossible to reinforce this extension wall with reinforcing ribs due to the need to secure a space for the fan to rotate, it is constructed so that it comes into pressure contact with the core surface of the radiator. , the fan shroud can be installed so that no gap is formed between it and the radiator. As a result, air is not sucked in through the gap between the radiator and the fan shroud, preventing a decrease in the amount of air passing through the radiator, and increasing the cooling effect of the radiator.
Since the fan shroud can be attached in close contact with the radiator, the noise caused by chatter of the fan shroud in the conventional example can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional fan shroud mounted on a radiator (distortion is exaggerated), and Fig. 2 is a plan view showing an embodiment of the present invention (protrusion amount f is exaggerated). (The same applies to Figure 3.), Figure 3 is a perspective view showing a state in which this is cut vertically at approximately the center, Figure 4 is a plan view showing the state in which the above embodiment is attached to a radiator, and Figure 5 The figure is a longitudinal side view. 1...Circumferential wall, 2...Protruding part of the circumferential wall,
3... Peripheral frame portion, 4... Extension wall, 5... Radiator, 6... Core surface, 8... Flange portion.

Claims (1)

[Scope of utility model registration request] A peripheral frame part having a flange part attached to the peripheral part of the core surface of the radiator and a circumferential wall surrounding the fan are integrally formed so that a part of the circumferential wall protrudes from the peripheral frame part in the radial direction. In the fan shroud made of synthetic resin, an extension wall that covers the back surface of the protruding portion of the circumferential wall is formed to hang down toward the core surface of the radiator and integrally continue with the flange portion at both ends, and the extension wall A fan shroud characterized in that the wall is slightly curved and protrudes toward the radiator side with respect to the core surface.