JP2000240592A - Rotor-inegrated shaft for fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thin a rotor and to reduce the cost by reducing the manhour in the manufacturing process and ensuring the product performance. SOLUTION: A rotor 1 having a fan 1a is molded integrally with a shaft 1b. A height H of a stepped part 1c formed on a connection part of the rotor 1 and the shaft 1b is lowered in comparison with a conventional one, so that the fan motor can be thinned. Further the diameter of the shaft 1b can be reduced with respect to the height of the stepped part 1c in comparison with a conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shaft-integrated rotor of a fan motor.

[0002]

[Prior art]
Conventionally, when a rotor (blade) is manufactured by a resin mold, a method of forming a metal shaft or press-fitting after forming is used. For this reason, it is necessary to attach a mold shaft at the time of insert molding, which leads to an increase in cost due to a longer molding time. In addition, the molding conditions become unstable, which causes product variations. In addition, it caused mold damage due to the shaft falling.

[0003]

In the method of press-fitting the shaft later, the motor vibration due to the inclination of the shaft has been caused. In both the insert and press-fitting methods, the metal shaft must be fixed and a sufficient height to hold the shaft is required to obtain strength.

FIGS. 3A and 3B show examples of a conventional fan motor. FIG. 3A shows an example of insert molding, and FIG. 3B shows an example of press-fitting a shaft into a rotor. (C) shows the vicinity of the shaft mounting portion. In the example of FIG. 3A, the rotor 10 having the fan 10a on the outer periphery is
Is manufactured by insert molding. Axis 12
Is mounted at right angles to a bearing 13 fixed to a shaft fitting portion 14 as shown in FIG. The example of FIG.
As described above, since the shaft 12 is vertically inserted with respect to the rotor 10 for insertion, there is large variation in products.

In the example shown in FIG. 3B, a rotor 15 having a fan 15a on the outer periphery is provided with a through hole 15b for press-fitting. An outer peripheral groove 16a is formed at one end of the through hole 15b.
Is press-fitted. For this reason, the shaft 16 must be press-fitted at a right angle to the rotor 15, but the shaft is tilted, causing the motor vibration as described above.

In FIGS. 3A and 3B, in order to obtain a strength higher than a predetermined value, as shown in FIG.
b and 15b are required, and the height H at that time is, for example, about 1.5 mm with a shaft φ of about 2 mm. An object of the present invention is to solve the above-mentioned problems and to provide a shaft-integrated rotor of a fan motor, which can contribute to thinning of the rotor and reduce costs by reducing man-hours in the manufacturing process and securing product performance. Is to do.

[0007]

In order to achieve the above object, a shaft integral rotor of a fan motor according to the present invention has a shaft portion formed at the center of the rotor portion of the fan motor so as to be perpendicular to the rotor. It is formed integrally with a mold.

[0008]

According to the above configuration, the fan motor can be further reduced in thickness and yield can be improved to reduce the cost.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1A and 1B are views showing an embodiment of a shaft-integrated rotor of a fan motor according to the present invention, wherein FIG. 1A is a front sectional view and FIG. 1B is a view showing a state where a shaft is fixed to a bearing. The rotor 1 is formed by a molding mold together with the fan 1a and the shaft 1b. Bearing 3 with magnet 2 attached and fixed to shaft fitting portion 4
1b is press-fitted and attached. The height H of the step portion 1c can be reduced as compared with the conventional case.

Since the shaft 1b is also made of plastic instead of a metal shaft, the joint between the rotor 1 and the shaft 1b has an increased strength as compared with a conventional insert or press-fitting method. Also, there is no variation in the product, and the shaft 1b
Can be reduced in diameter. By the way, the step is 2m
m, the diameter of the shaft could be reduced to 1.0 mm.

FIG. 2 is a view showing the gate port of the rotor at the time of molding. Since there is no need to provide a metal shaft or a press-fit hole at the center of the rotor, the gate port 6 can be provided at the center of the rotor 5. One gate port can be provided at the center, and a uniform flow of the material can be secured, the distortion of the product can be reduced, and the removal and finishing of the molding mold can be simplified. In the conventional example shown in FIGS. 3 (a) and 3 (b), a gate port cannot be provided at the center of the rotor. Therefore, several gates are provided around the center of the rotor for uniform molding. Removal is complicated, and a lot of material loss occurs due to a plurality of gate openings.

[0012]

As described above, according to the present invention,
The following various effects can be obtained. The shaft is not required for the conventional shaft molding insert, and the cost of parts can be reduced. Eliminating the shaft during molding eliminated man-hours. Shaft attachment during molding was eliminated, and variations in products were reduced due to stability of molding conditions. The shaft was not attached during molding, and there was no need to worry about mold damage.

Next, for a conventional example of shaft press-fitting,
Shafts are no longer required, reducing parts costs and press-in man-hours. The shaft inclination was eliminated, and the vibration variation of the motor was reduced. Parts loss due to shaft tilt has been eliminated. The height of the shaft press-fitting part can be reduced and the motor can be made thinner. By molding the shaft portion, the material injection hole (gatero) at the time of molding can be easily made to the center, the material flow can be made uniform, and the distortion of the product can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a shaft-integrated rotor of a fan motor according to the present invention, wherein FIG.
(B) is a figure which shows the state which fixed the shaft to the bearing.

FIG. 2 is a diagram showing a gate port of a rotor during molding and molding.

FIG. 3 is a view showing an example of a conventional fan motor, and FIG.
Shows an example at the time of insert molding, (b) shows an example at the time of press-fitting the shaft into the rotor, and (c) shows a vicinity of the shaft mounting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotor 1a, 10a ... Fan 1b ... Shaft 1c ... Step part 2, 11 ... Magnet 3, 13 ... Bearing 4, 14 ... Shaft fitting part 5, 10 ... Rotor 6 ... Gate port 12 ... Shaft

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 15/16 H02K 15/16 BF term (Reference) 3H033 AA02 BB02 BB08 BB20 CC01 CC06 DD06 DD13 DD25 DD26 DD30 EE05 EE06 EE10 5H002 AA07 AC07 5H607 AA12 BB01 BB13 CC01 CC05 DD02 DD03 DD16 FF04 FF12 GG08 JJ01 JJ06 KK07 5H615 AA01 BB01 BB15 PP02 PP24 PP25 SS19 SS44 TT05 TT26 5H622 CB06 PP03

Claims (1)

[Claims] At a central portion of a rotor portion of a fan motor,
A shaft integrated rotor of a fan motor, wherein a shaft portion is integrally formed by a molding mold so as to be perpendicular to the rotor.