JPS636480Y2 - - 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. Another object of the present invention is to provide a fan shroud that is easy to manufacture and has excellent motor mounting properties.

Conventional motor and fan shroud mounting structures are shown in, for example, Japanese Utility Model Application Publication No. 51-160205 or US Pat. No. 3,303,995.

In the motor disclosed in the above-mentioned publication, when the motor is attached to the fan shroud, the motor is fixed to the fan shroud by tightening the mounting bolt together with the nut. Further, in the device shown in the above specification, a notch is provided in the fan shroud, a washer is inserted into the notch, and a bolt is tightened to fix the motor and the fan shroud.

However, in the above publications and specifications, if the nut or washer is not held by some external force when tightening the mounting bolt, the female threaded part of the nut or washer and the female threaded part formed in the fan shroud must be held together. There is a problem in that it is not possible to perform position alignment. Therefore, when tightening this tightening bolt, some care must be taken to position the nut and washer, which results in a problem in that the efficiency of the tightening work is reduced.

Therefore, in the present invention, the following measures were taken to solve the above problems. That is, a holding recess is integrally formed on the surface of the flange opposite to the motor fixing collar abutment surface, and a claw portion having a predetermined protrusion amount is formed to protrude from the inner wall of the side periphery of the holding recess.
By pressing and inserting the female threaded member into the holding recess, the female threaded member is stably held within the holding recess by the claws.

An embodiment of the present invention will be described below based on the drawings. In FIGS. 1 and 2, 1 is a resin fan, and 2 is a motor that drives this fan 1. In FIG.
A flange 2a for mounting and fixing is formed on the side wall of the motor 2, and the flange 4 of the fan shroud 3 and the tapping screw plate 6 are connected to the tapping screw 5 through the flange 2a. It has become fixed in place. More precisely, as shown in Fig. 2, the plate 6 for the tapping screw is inserted into the holding recess 4a provided on the rear surface of the flange so that the plate 6 is fixed to the flange portion 4. plate 6
The flange portion 2a of the motor 2 is held between the flange portion 2a and the tapping screw 5.

As shown in FIGS. 3 and 4, a claw portion 4b is formed protruding within the holding recess 4a provided on the rear surface of the flange 4 for the purpose of positioning and holding the plate 6. Further, the opening length C of the holding recess 4a is slightly smaller than the size H of the plate 6 (as shown in FIG. 5), and the seat length D of the holding recess 4a is set slightly larger than the size H of the plate 6. When inserting the plate 6 into the holding recess 4a, the plate 6 is press-fitted while being elastically deformed. Therefore, the plate 6 once housed in the holding recess 4a will not fall out or become in an incorrect position when the tapping screw 5 for fixing the motor 2 is tightened. Further, in order to prevent the plate 6 from rotating due to the tightening torque of the tapping screw 5, the plate 6 and the holding recess 4a are formed into a polygonal shape. Further, the end of the plate 6 is formed into an arc shape, and the plate 6 is held in the recess 4a.
It has become easier to work when applying pressure inward.

Further, as shown in FIG. 1, the flange portion 4 is formed into a ring shape and is fixed to the shroud portion 8 of the fan shroud 3 by four radially projecting arms 7. The arms 7 are formed into a U-shaped cross section, and one of the arms 7 is integrally formed with a clamp 7a, as shown in FIG. 6, to securely secure the lead wire 2b of the motor 2. It is now possible to hold the The shroud part 8 is disposed to wrap around the tip of the fan 1 in order to effectively guide the wind generated by the fan 1 to the radiator.As shown in the cross-sectional view in FIG. The intake duct part 8a is formed into a bell mouth shape so as to guide the air well with low noise, and the cylindrical part 8b faces the tip of the fan 1 through a small gap.
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 portion 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 at approximately equal intervals on the circumference in order to improve rigidity. (8 articles in this embodiment) are provided. As shown in FIG. 2, 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, which is a smooth surface. The arm 7 protrudes from the portion 8a at a right angle, and as a result, the intake duct portion 8a can maintain its bell mouth shape to the maximum extent possible, reducing noise and reducing ventilation resistance due to the adoption of the bell mouth shape. The effect of the reduction is now maximized.

In addition, the intake duct part 8 of the shroud part 8
A clamp 8e is installed at the lowest point of a.
are integrally formed so that the breather pipe 2c of the motor 2 can be clamped and fixed. Reference numeral 9 denotes mounting stays having a U-shaped cross section, and are provided in the same number as the arms 7 on the outer periphery of the shroud portion 8 at positions facing the arms 7, and are fitted with nuts 10 embedded in their tip portions 9a. The fan shroud 3 is attached to a member to be attached, such as a radiator or the body of an automobile.

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 a resin mold of a resin material such as nylon, Diuracon, or polypropylene, or die cast of aluminum, etc. Therefore, at the connecting portion between the shroud part 8 and the mounting stay 9, a space is formed between the mounting stay 9 and the shroud part 8. 11 has a cross-sectional area that is the same or gradually increases toward the outer periphery of the shroud portion 8, particularly the skirt portion 8c (direction A in FIG. 7), so that it can be easily cut out. In addition, 8 in Figure 7
A reinforcing rib f is integrally formed at a position on the outer surface of the shroud portion 8 in the connecting portion space 11, and is intended to improve the rigidity of the connecting portion.

In addition, since the fan shroud with the above configuration uses lightweight materials such as resin and aluminum, the weight of the fan shroud 3 can be significantly reduced.In particular, weight reduction is strongly required to improve fuel efficiency. When used as a fan shroud for an automobile radiator, this weight reduction fully satisfies the requirements of the automobile industry. In addition, especially when resin is used as the material, the material cost can be considerably lower than that of conventional materials (iron plates were conventionally used).

In addition, in this embodiment, since the arm 7 and the mounting stay 9 are arranged on the same line, the load applied to the arm 7 by supporting the motor 2 can be directly transmitted to the mounting stay 9, which has a high specific stiffness, and the shroud part 8 can be prevented from being subjected to the vibration load of fan 1 and motor 2, and as a result, it has sufficient durability even though it uses materials with lower rigidity than iron plates, such as resin and aluminum. .

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-described example, the plate 6 in the holding recess 4a of the flange portion 4 was fixed with the tapping screw 5, but as shown in FIG. 8, a plate nut 6' or the like is used as the plate, and this plate nut The effect is the same even if the motor fixing collar 2a is fixed to 6' with a bolt with washer 21. Furthermore, as shown in FIG. 9, a positioning collar 22 may be provided between the plate 6 and the flange portion 2a of the motor 2 to prevent creep deformation of the resin portion due to heat or the like. Further, in the above example, the arm 7 and the mounting stay 9, which have a U-shaped cross section, may have other shapes such as a streamlined shape.

Furthermore, in the above-mentioned example, the shroud part 8 was divided into a bellmouth-shaped intake duct part 8a, a skirt part 8c, and a cylindrical part 8b according to their cross-sectional shapes.
A and the skirt portion 8c may have a simple tapered shape, or the intake duct portion 8a may be omitted. Further, in the present invention, as described above, since a large load is not applied to the shroud portion 8, the thickness of the shroud portion 8 may be made thinner, particularly at the tip portion.

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 after passing through the radiator to 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. 2, and therefore the intake duct portion 8a will not require as large a curvature as shown in FIG.

As explained above, the fan shroud of the present invention has the advantage that the flange, arm, shroud, and mounting stay are all integrally molded from the same material, making manufacturing extremely simple and greatly improving productivity. It has a good effect.
Furthermore, with the fan shroud of the present invention, the motor and the flange can be fixed using inexpensive parts such as a male thread such as a tapping screw and a female thread member such as a plate or nut. This has particularly excellent effects such as simplifying the mold structure and reducing the number of molding steps.

Further, in the present invention, a claw portion having a predetermined amount of protrusion is formed protrudingly on the side peripheral inner wall of the holding recess provided in the flange portion, and the female screw member is held in the holding recess by the claw portion. By arranging the female threaded member within the holding recess, the position of the female threaded member can be stably held without being subjected to external force. Therefore, when tightening the male screw, there is no need to pay any attention to the positioning of the female screw member, making the tightening work of the male screw easier, and by extension, automatically tightening the male screw.

[Brief explanation of drawings]

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 of the flange holding recess of the fan shroud, and Fig. 4 is the same as Fig. 3. Fig. 5 is a front view of the plate, Fig. 6 is a sectional view taken along line C-C in Fig. 1, Fig. 7 is a sectional view taken along line B-B in Fig. 1, and Fig. 8 is a sectional view taken along line B-B in Fig.
9 are sectional views showing a fixing portion between a motor collar and a flange, showing another embodiment of the present invention. 1...Fan, 2...Motor, 2a...Fixing collar, 3...Fan shroud, 4...Flange, 4a...Holding recess, 5...Tapping screw forming a male thread, 6...Female thread Plate forming a member, 8...shroud part.

Claims (1)

[Scope of utility model registration request] The fan includes a flange portion for fixing the motor of the 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 an arm portion connecting the shroud portion and the flange portion. , a fan shroud integrally molded from the same material, in which a holding recess is integrally molded on a surface of the flange portion opposite to a contact surface of the fixing collar portion of the motor; By forming a protruding claw part on the inner wall and press-inserting a female threaded member into the holding recess, the female threaded member is stably held in the holding recess by the claw part, and the female threaded member is used to tighten the motor. A fan shroud, characterized in that the fixing collar is fixed to the flange with a male screw.