JPH0630500U - Electric fan device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an electric fan device that is inexpensive and secures sufficient heat dissipation as compared with a conventional electric fan device. In an electric fan device in which a motor fan 25 is attached to a motor 27 by inserting a rotating shaft 9 of a motor 27 into a metal insert 3 fixed to a boss portion 1 of a resin motor fan 25. A thin metal plate 19 having a plurality of radiating fins 21 cut and raised in the rotation direction of the motor fan 25 is attached to the rotary shaft 9 of the motor 27 with a gap between the plate and the surface 1a of the boss 1. It was done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric fan device mounted on a vehicle radiator or the like.

[0002]

[Prior art]

 Generally, a vehicle radiator is equipped with an electric fan device that forcibly cools the radiator in order to improve heat exchange efficiency. Conventionally, the motor fan in this type of electric fan device is a resin injection-molded product as disclosed in Japanese Utility Model Publication No. 54-148912, and the boss portion 1 is made of aluminum as shown in FIG. The structure is such that the manufactured insert 3 is fixed.

That is, FIG. 7 shows a conventional motor fan in an electric fan device, in which an insert 3 is fixed to the center of a resin-made boss portion 1 in which a plurality of fan blades 5 are integrally molded on the outer periphery. As shown in FIG. 8, the insert 3 has a plurality of protrusions 7 provided on the outer periphery thereof embedded in the boss portion 1 and engaged and fixed.

The rotating shaft 9 of the motor is screwed to the insert 3 with a nut 11. Since the insert 3 also has a function of radiating the heat of the motor propagating through the rotary shaft 9, these days, for the purpose of improving the durability of the motor, the insert 3 shown in FIGS. There is proposed a motor fan 17 in which the insert 13 is formed large as shown in FIG. 1 and a plurality of heat radiation fins 15 are integrally provided on the surface side thereof to improve heat radiation.

[0005]

[Problems to be solved by the device]

 However, although the motor fan 17 has the heat radiation fins 15 provided on the insert 13 to increase the heat radiation area, it cannot be said that the heat radiation is still sufficient because the heat radiation surface is only on one side, and the insert 13 is molded. Had to make a new mold different from the conventional insert 3.

Moreover, since the insert is a portion for transmitting the rotational force of the motor to the boss through the rotary shaft, it is necessary to increase the wall thickness in order to secure its strength. Therefore, if the insert 13 having a large outer diameter as shown in FIG. 9 is manufactured with the same thickness as that of the insert 3 shown in FIG. 7, the manufacturing cost of the motor fan 17 becomes high.

The present invention has been devised in view of such circumstances, and an object thereof is to provide an electric fan device that is low in cost while ensuring sufficient heat dissipation as compared with a conventional electric fan device. .

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides an electric fan device in which a motor fan is inserted into a motor by inserting a motor rotation shaft into a metal insert fixed to a resin motor fan boss. In this case, a thin metal plate in which a plurality of heat radiation fins are cut and raised in the rotation direction of the motor fan is inserted and attached to the rotation shaft of the motor with a gap between the surface and the boss portion.

[0009]

[Action]

 According to the present invention, the heat of the motor propagated to the plate via the rotating shaft is radiated by the plate. However, when the motor fan is rotated by driving the motor, the air flow causes the heat radiation fin to move. After passing through the cut-and-raised holes, it flows into the back side of the plate, and heat is actively dissipated on the front and back sides of the plate.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Since the configuration excluding the devised portion is the same as that of the conventional example shown in FIGS. 7 and 8, a description thereof will be omitted here, and the devised portion will be described exclusively. The same parts as those in the above-mentioned conventional example are indicated by the same reference numerals.

FIG. 1 is a front view of a disk-shaped plate 19 obtained by press-molding a thin aluminum plate material, and FIG. 2 is a side view of the plate 19 shown in FIG. Are radially cut and raised in the rotation direction of the motor fan 25 (in the direction of the arrow in FIG. 3) around the rotation shaft insertion hole 23 provided in the center. 4 is a sectional view taken along line IV-IV in FIG.

Further, as shown in FIG. 5, a recess 19a is formed at the center of the plate 19 so as to be fitted into the recess 3a provided at the center of the insert 3. When mounting the plate 19 on the motor 27, When the recess 19a is fitted in the recess 3a of the insert 3, a slight gap m is formed between the recess 19a and the surface 1a of the boss 1.

In order to attach the plate 19 to the motor 27 together with the motor fan 25, first, the insert 3 of the motor fan 25 is inserted into the rotary shaft 9 of the motor 27 as shown in FIG. By fitting the recess 19a of the plate 19 into the recess 3a of the insert 3 and inserting the rotary shaft 9 into the rotary shaft insertion hole 23, and tightening these with the nut 11, as shown in FIG. The plate 19 is inserted into and attached to the rotary shaft 9 of the motor 27 with a slight gap m formed between the plate 19 and the surface 1a of the boss 1.

The electric fan device according to the present embodiment is configured in this way, and the heat of the motor 27 transmitted to the insert 3 and the plate 19 via the rotating shaft 9 with the driving of the motor 27 is transmitted by the plate 19. Although heat is radiated, in this embodiment, as described above, the radiating fins 21 are cut and raised on the plate 19 and a small gap m is formed between the plate 19 and the surface 1a of the boss 1 to rotate the plate 19. When the motor fan 25 is driven by the motor 27 to rotate in the direction of the arrow as shown in FIG. 3, the flow of the air W causes the flow of the air W into the cut-and-raised holes of the radiating fins 21 as shown in FIG. Since the heat is passed through the plate 29 and flows into the back surface of the plate 19, heat is radiated positively on the front and back surfaces of the plate 19.

Therefore, according to the plate 17 in this embodiment, a heat radiation area which is twice as large as that of the insert 13 shown in FIG. 9 can be obtained, and the flow of the air W causes the cut-and-raised holes of the heat radiation fins 21. Since it passes through 29 and flows into the back side of the plate 19, it has an advantage that the cooling efficiency can be improved and the life of the motor 27 can be extended as compared with the electric fan device having the motor fan 17 as shown in FIG. .

Further, according to the present embodiment, the electric fan device using the motor fan shown in FIG. 7 may be simply retrofitted with the above-mentioned plate having the radiation fins formed according to the load of the motor. The cooling efficiency of the motor can be improved without making any changes to the conventional electric fan device.

Further, unlike the insert 3, the plate 19 of the present embodiment does not transmit the rotational force of the motor 27 to the boss portion 1 via the rotary shaft 9, so that the plate 19 is formed as thick as the insert 3. It is not necessary, and therefore, the cost can be suppressed as compared with the electric fan device using the insert 13 as shown in FIG.

In addition, according to the present embodiment, it is possible to secure heat dissipation according to the load of the motor simply by changing the size of the heat dissipation fin.

[0019]

[Effect of device]

 As described above, according to the present invention, it is possible to improve the cooling efficiency of the motor and extend the life of the motor simply by retrofitting the plate without modifying the conventional electric fan device. In addition to being possible, it is possible to reduce the cost compared to the conventional electric fan device using a large insert.

[Brief description of drawings]

FIG. 1 is a front view of a plate used in an embodiment of the present invention.

FIG. 2 is a side view of the plate shown in FIG.

FIG. 3 is a front view of a motor fan to which the plate shown in FIG. 1 is attached.

FIG. 4 is a sectional view taken along line IX-IX in FIG.

FIG. 5 is a sectional view of an electric fan device according to an embodiment of the present invention.

FIG. 6 is an exploded perspective view of an electric fan device according to an embodiment of the present invention.

FIG. 7 is a front view of a motor fan used in a conventional electric fan device.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a front view of a motor fan used in another conventional electric fan device.

10 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Boss 1a Surface 3 Insert 3a, 19a Recess 5 Fan blade 9 Rotating shaft 19 Plate 21 Radiating fin 25 Motor fan 27 Motor

Claims (1)

[Scope of utility model registration request] 1. A motor fan (2) is obtained by inserting a rotary shaft (9) of a motor (27) into a metal insert (3) fixed to a boss (1) of a resin motor fan (25).
In an electric fan device in which 5) is attached to a motor (27), a plurality of heat radiation fins (21) are cut and raised on the rotation shaft (9) of the motor (27) in the rotation direction of the motor fan (25). An electric fan device, characterized in that a thin metal plate (19) is attached to the surface (1a) of the boss portion (1) with a gap therebetween.