JPS6123607Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fan shroud, and is effective when used to guide cooling air from an electric fan to a radiator for heat dissipation of engine cooling water in an automobile, for example. It is an object of the present invention to provide a fan shroud that is extremely lightweight and inexpensive and has sufficient air guiding performance.

An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, 1 is a resin fan, 2
is a motor that drives this fan 1. A mounting collar 2a is formed on the side wall of the motor 2, and the motor 2 is fixed to the flange 4 of the fan shroud 3 with bolts 5 via the collar 2a. More precisely, as shown in FIG. 2, a nut 6 is embedded in the flange portion 4, and the flange portion 2a of the motor 2 is held between the nut 6 and the bolt 5.

Further, the flange portion 4 is formed into a ring shape as shown in FIG. 1, and has four arms 7 projecting radially.
It is becoming fixed. In addition, arm 7
The arms 7 are formed into a U-shaped cross section to improve strength, and the arms 7 are spaced apart by approximately equal angles to improve vibration resistance.

The shroud part 8 is provided with a fan 1 in order to properly guide the wind generated by the fan 1 to the radiator.
As shown in the cross-sectional view in FIG. 2, the intake duct part 8a is formed in a bell mouth shape so as to properly guide wind to the fan 1 with low noise, and the tip of the fan 1. It consists of a cylindrical portion 8b facing the fan 1 with a small gap therebetween, and a skirt portion 8c formed into a bell mouth shape so as to guide the wind from the fan 1 to the radiator without loss. The inner surface of this shroud 8 is a smooth surface so that the wind can flow without loss, and the outer surface is provided with a plurality of reinforcing ribs 8d spaced at approximately equal intervals on the circumference in order to improve rigidity. In the embodiment, Article 8) is provided.

The connecting portion between the shroud portion 8 and the arm 7 is such that the arm 7 is directly connected to the inner surface of the intake duct portion 8a, as shown in FIGS. 2, 3, and 4. That is, the arm 7 protrudes from the intake duct part 8a at a right angle, and as a result, the intake duct part 8a can maintain its bellmouth shape for as long as possible, thereby reducing the noise caused by adopting the bellmouth shape. The effects of reduction and reduction of ventilation resistance can be maximized.

A plurality of mounting stays 9 having a U-shaped cross section are integrally molded on the outer periphery of the shroud portion 8. A nut 10 embedded in the tip portion 9a allows the fan shroud 3 to be attached to a radiator or an automobile body. It is designed to be attached to a mounting member such as the following. Therefore, this installation stay 9
The installation location will be selected appropriately depending on the shape of the vehicle body, etc., and since the arms 7 mentioned above are arranged at approximately equal angles apart, the mounting stay 9 and the arm 7 are the same. It is becoming difficult to place them on the line.

In the fan shroud 3 of the present invention, these parts, that is, the flange part 4, the arm 7, the shroud part 8, and the mounting stay 9, are made of resin molded resin material such as nylon, diuracon, or polypropylene, or die cast aluminum. The shroud part 8 and the mounting stay 9 are integrally molded by
A space 11 formed between the mounting stay 9 and the shroud part 8 at the connection part with the
In order to facilitate die cutting, the cross-sectional area of the shroud portion 8, especially its skirt portion 8c, is the same or gradually increases toward the outer circumferential direction (direction A in FIG. 4). In FIG. 5, reference numeral 8e denotes a reinforcing rib that is integrally formed at a position on the outer surface of the shroud portion 8 in the connecting portion space 11, and is used to improve the rigidity of the connecting portion.

Therefore, in this example, since the fan shroud 3 is integrally molded, the shroud part 8 as used in the production of the conventional fan shroud 3 is
It is possible to eliminate the need for welding between the shroud portion 8 and the arm 9 and the welding between the shroud portion 8 and the mounting stay 9, which greatly improves work efficiency and significantly reduces manufacturing costs. Furthermore, since lightweight materials such as resin and aluminum are used, the weight of Fan Shroud 3 has been significantly reduced, and it is used particularly as a fan shroud for automobile radiators, where weight reduction is strongly required to improve fuel efficiency. In some cases, this weight reduction is sufficient to satisfy the requirements of the automotive industry. In particular, where resin is used as the material, the material cost can be considerably lower than that of conventional materials (conventionally, iron plates).

Further, in the fan shroud 3 of the present invention, a reinforcing rib 8d is provided on the outer surface of the shroud portion 8, and a reinforcing rib 8d is provided on the connecting portion 12 between the shroud portion 8 and the arm 7.
Furthermore, since reinforcing ribs 8e are also provided on the connecting portion 11 between the shroud portion 8 and the mounting stay 9, the durability of the fan shroud 3 is sufficient.

Although the above-mentioned embodiments are preferred embodiments of the present invention, the present invention should not be limited to this one embodiment, and various other embodiments may be considered. That is, in the above example, the flange portion 4 and the mounting stay 9
Although the nuts 5 and 10 provided in the above are integrally molded by embedding, the nuts 5 and 10 may be added and fixed in a later process, and in the above example, the arms 7 and 10 having a U-shaped cross section are The mounting stay 9 may have other shapes such as a streamlined shape.

Further, in the above example, the shroud part 8 is divided into a bellmouth-shaped intake duct part 8a, a skirt part 8c, and a cylindrical part 8b according to their cross-sectional shapes, but the intake duct part 8 can be divided as needed.
The shapes of the skirt portion a and the skirt portion 8c may be a simple taper shape or an arc shape. In short, the ventilation resistance of air passing through the fan shroud 3 can be reduced if the end face of the shroud part has an inclined shape in which the cross-sectional area increases rapidly as it goes outward from the shroud part.

Furthermore, in the above example, a so-called push type fan shroud 3 was described in which the air flow generated by the fan 1 is directed toward the radiator after passing through the shroud portion 8, but the fan shroud of the present invention directs the air flow after passing through the radiator into the fan shroud. It goes without saying that it can also be used as a so-called suction type fan shroud.
However, in that case, the air flow will be in the opposite direction to the direction shown by arrow A in FIG.
A curvature as large as that shown in FIG. 2 is not required.

As explained above, in the fan shroud of the present invention, the flange part, arm, shroud part, and mounting stay are all integrally molded from lightweight materials such as resin or aluminum, making manufacturing extremely simple and improving productivity. It has the excellent effect that the width can be greatly improved and the weight can be significantly reduced, so that the fan shroud can be made extremely lightweight and inexpensive.

Furthermore, in the fan shroud of the present invention, the arm is directly connected to the end face of the shroud part, that is, the arm 7 is connected at right angles to the end face of the shroud part.
Because the end surface of the shroud is designed to protrude, the sloped shape of the end face of the shroud can be maintained for as long as possible, and the effect of reducing noise and ventilation resistance due to the adoption of the sloped shape can be maximized. It has excellent effects.

Furthermore, in the fan shroud of the present invention, the space formed between the mounting stay and the outer surface of the shroud is formed so that its cross-sectional area increases or becomes the same as it faces toward the outer circumferential side of the shroud. It has excellent effects such as being able to be easily cut out when integrally molded with the material.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the fan shield of the present invention, Fig. 2 is a half-sectional side view of Fig. 1, Fig. 3 is a sectional view taken along the line B-B in Fig. 1, and Fig. 4 is a cross-sectional view of Fig. 1. 1
5 is a sectional view taken along the line CC in FIG. 1. 1... Fan, 2... Motor, 3... Fan shroud, 4... Flange section, 7... Arm, 8
...Shroud part, 9...Mounting stay.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A flange portion for fixing the motor of an electric fan, a shroud portion provided on the outer circumferential side of the flange portion for rectifying the wind generated by the electric fan, and this shroud portion. a plurality of arms suspended between an inner surface and the flange portion to connect the shroud portion and the flange portion; and a plurality of mounting arms provided on the outer surface of the shroud portion for attaching the shroud portion to a mounting member. It is equipped with a stay, and these flange parts,
The shroud part, the arm, and the mounting stay are integrally molded from a lightweight material such as resin or aluminum, and the end surface of the shroud part is formed into an inclined shape whose cross-sectional area increases toward the outside of the shroud part, and This inclined shape is maintained also in the vicinity of the joint between the arm and the shroud part, and the space formed between the mounting stay and the outer surface of the shroud part faces toward the outer circumferential side of the shroud part. A fan shield characterized by being formed so that the cross-sectional area increases or becomes the same. (2) The fan shroud according to claim 1, wherein at least one of the arms is connected to the shroud portion at a position away from the axis of the mounting stay.