JPS6232360B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fan shroud part,
For example, it 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. Another object of the present invention is to provide a fan shield that is extremely easy to manufacture.

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 flange 2a for attachment 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 flange 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 adapted to be fixed to the first shroud portion 8 of the fan shroud 3 by. Note that the arm 7 is formed into a U-shaped cross section to increase strength.

The first shroud part 8 is designed to properly guide the wind generated by the fan 1 to the radiator.
It is arranged so as to wrap around the tip of fan 1, and
As shown in cross-section in the figure, there is an intake duct part 8a formed into a bell mouth shape to guide the wind from the fan 1 well with low noise, and a cylindrical part 8b facing the tip of the fan 1 with a small gap therebetween. Consists of.

As shown in FIG. 2, the connecting portion between the first 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, which is shaped like a bell mouth. The arm 7 protrudes from the duct part 8a at a right angle, and as a result, the intake duct part 8a can maintain a perfect bell mouth shape except for the connection part with the arm 7. Now, the effects of noise reduction and ventilation resistance reduction can be maximized.

9 is a mounting stay with a U-shaped cross section;
The same number of arms 7 are provided on the outer periphery of the shroud portion 8 at positions facing the arms 7, and nuts 10 are embedded in the tip portions 9a of the shroud portions 8, as shown in FIG. It is intended to be attached to a mounting member such as a radiator or the body of an automobile.

In the fan shroud 3 of the present invention, the flange portion 4, arm 7, first shroud portion 8, and mounting stay 9 are integrally molded. However, these constituent parts of the fan shroud 3, namely, the flange portion 4, the arm 7, and the first
The shroud part 8 and the mounting stay 9 are used to fix the heavy fan 1 and motor 2, and to fix the fan shroud 3 itself to a vibrating car, so they are made of resin with excellent vibration resistance and durability. For example, resin molding is carried out using resin materials such as nylon, diuracon, or polypropylene reinforced with reinforcing agents such as glass fibers, or aluminum, which is a lightweight metal, is die-cast. , a reinforcing rib 8c is provided at a position on the outer surface of the shroud part 8 in a space 11 formed between the mounting stay 9 and the first shroud part 8 at the connection part between the first shroud part 8 and the mounting stay 9. It is formed integrally to improve the rigidity of the connecting part.

20 is a second shroud part that is connected to the cylindrical part 8b of the first shroud part 8 and leads the wind from the fan 1 to the radiator.As shown in FIG. It consists of a fitting cylindrical part 20a that fits together, and a skirt part 20b that has a bell mouth shape so as to guide the wind without loss.
The second shroud part 20 is used exclusively for rectifying the wind, and is not subject to any particularly large loads, so there is no problem with strength, so it is made of nylon, diuracon, polypropylene, etc. In addition to resin materials and aluminum, it is also possible to use materials such as hard rubber and waterproofed cardboard. And first,
When the second shroud parts 8 and 20 are molded from the same material, the cylindrical part 8b and the fitting cylindrical part 20a are heat welded, and when they are molded from different materials, they are joined with an adhesive. .

Therefore, in the present invention, of the fan shroud 3, the flange portion 4, the arm 7, the first shroud portion 8,
Also, since the mounting stay 9 is integrally molded, welding between the shroud part 8 and the arm 7 and the welding between the shroud part 8 and the mounting stay 9, which were used in the production of the conventional fan shroud 3, is no longer possible. It can be made unnecessary, thereby greatly improving work efficiency. In particular, in the present invention, the shroud parts are the first and second shroud parts 8, 2.
Since these components 4, 7, 8, and 9 are molded separately, the resin mold or die-cast mold required to integrally mold these components can have an extremely simple mold structure, reducing manufacturing costs. This means that it is possible to significantly reduce the

Furthermore, in the present invention, since lightweight materials such as resin and aluminum are used, the weight of the fan shroud 3 and the second shroud portion 20 can be greatly reduced, and in particular, the weight can be reduced to improve fuel efficiency. This reduction in weight fully satisfies the demands of the automotive industry when used as fan shrouds for automotive radiators, which are in high demand. Especially when resin is used as the material,
The material cost can also be considerably lower than that of conventional ones (conventionally, steel was used).

In addition, in the fan shroud of the present invention, when used in an automobile, the flange portion 4, arm 7, first shroud portion 8, and the mounting The stay 9 is made of a resin material such as nylon or diyuracon, which has little strength loss even at high temperatures, or die-cast aluminum, and the second shroud part 20, which does not require much strength and rigidity, is made of an inexpensive material such as cardboard or polypropylene. Therefore, the material cost of the entire fan shroud 3 can be further reduced.

Furthermore, in the fan shroud of the present invention, as shown in FIG. It is possible to prevent vibration loads from the fan 1 and motor 2 from being applied to the first shroud part 8, and as a result, despite using materials with lower rigidity than iron plates such as resin and aluminum, It will have sufficient durability.

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 can be considered.

That is, in the above-mentioned example, the nuts 5 and 10 provided on the flange portion 4 and the mounting stay 9 are integrally molded by embedding, but the nuts 5 and 10 may be added and fixed in a later process.
Further, in the above example, the arm and the mounting stay 9, which have a U-shaped cross section, may have other shapes such as a streamlined shape.

Further, in the above example, the wind A after passing through the fan shroud 3 is sent to the radiator. I explained about the so-called push-in type fan shield,
It goes without saying that the fan shroud of the present invention can be used as a so-called suction type fan shroud that sucks air from the radiator side by operating the fan 1. In this case, the air flow is opposite to the direction of the arrow in FIG. 2, so the intake duct portion 8a (becomes the wake of the air flow).
may be abolished.

Further, in the present invention, since a large load is not applied to the skirt portion 20b of the second shroud portion 20 as described above, the thickness of the skirt portion 20b may be made thinner, particularly at the tip portion.

Further, the first shroud part 8 and the second shroud part 20 are connected by fitting the fitting cylindrical part 20a of the second shroud part 20 to the outer periphery of the cylindrical part 8b of the first shroud part 8, and at that part, As shown in FIG. 5, the same number of hooks 20c provided on the fitting cylindrical portion 20a may be fitted into and fixed to several hooks 8d provided on the outer periphery of the cylindrical portion 8b. Further, as shown in FIG. 6, mechanical coupling may be carried out by fitting the fitting cylindrical portion 20a onto the outer periphery of the cylindrical portion 8b and attaching it with several clips 21 as shown. Furthermore, these two parts 8b and 20a can be joined together by riveting, welding, joining with an adhesive, or, although not shown, the entire periphery or several protrusions on the outer periphery of the cylindrical part 8b of the first shroud part 8. is provided, and the second shroud part 2 is installed at that location.
The same effect can be obtained even if the protrusions provided on the fitting cylindrical portion 20a of No. 0 are brought together over the entire circumference or the same number of protrusions and subjected to processing such as thermal caulking.

Since the same number of arms and mounting stays are formed and they are arranged coaxially so as to sandwich the first shroud part from both sides, the external vibration force due to the weight of the motor or fan fixed to the flange part is It is transmitted directly to the mounting stay via the arm, and is not transmitted to the first shroud portion, which has relatively weak strength. Therefore, since this first shroud part, which has a weak strength, is not deformed by the external vibration force from the motor and the fan, it is possible to reduce the thickness of the first shroud part, and at the same time, the inner surface of the first shroud part and the electric fan can be made thinner. The clearance with the tip can always be maintained at an appropriate value, and interference between the two can be prevented.

Furthermore, in the present invention, at the joint between the arm and the inner surface of the shroud, the arm, the side wall surface of the flange, and the inner surface of the cylindrical portion of the shroud come into contact with each other, so that wind can flow smoothly near this joint. turbulence can be suppressed. Therefore, problems such as a decrease in air blowing efficiency or generation of noise can be prevented.

Further, in the present invention, the first shroud part and the second shroud part
Since the shroud part is formed separately, even if the size of the automobile radiator to which the second shroud part is attached changes, it is only necessary to change the size of the second shroud part, and the other components This has the advantage that all parts can be used in common.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the fan shroud 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. 1
5 and 6 are cross-sectional views showing other embodiments of the fan shroud of the present invention, respectively, and show the cross-sectional shape corresponding to the line A-A in FIG. 1. FIG. 7 is a perspective view showing the attachment portion between the arm, the intake duct portion, and the stay, and FIG. 8 is a perspective view showing the stay as seen from the direction of arrow P in FIG. 1... Fan, 2... Motor, 3... Fan shroud, 4... Flange section, 7... Arm, 8
...First shroud part, 9...Mounting stay, 2
0...Second shroud section.

Claims (1)

[Scope of Claims] 1. A fan shroud made of a resin material and arranged opposite to the heat exchange part of an automobile radiator, comprising: a flange portion for fixing a motor of an electric fan; and a fan shroud provided on the outer peripheral side of the flange portion. a first shroud section consisting of a bellmouth-shaped intake duct section and a cylindrical section; a plurality of arms for connection; a plurality of attachment stays provided on the outer surface of the first shroud portion for attaching the first shroud portion to the attached portion; and a separate body from the first shroud. a cylindrical portion of the first shroud portion, and has an open end whose inner diameter gradually increases to have an area larger than the cylindrical cross-sectional area of the cylindrical portion; a second shroud part that guides the generated wind, the flange part, the first shroud part, the arm,
and the mounting stay are integrally formed from a resin material, and the arms and the mounting stay are formed in the same number and are arranged on the same line in the radial direction so as to sandwich the first shroud part from both sides. , the arm extends from the flange toward the first shroud, then bends at a substantially right angle, and is joined to the inner surface of the first shroud while maintaining its cross-sectional shape, the outer wall surface of the arm The arm and the inner surface of the cylindrical portion are joined so that the outer wall surface facing the center side of the fan shroud and the inner surface of the cylindrical portion are continuous and the same surface. Juan shuloud.