JP2561988Y2 - Fan motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor.

[0002]

2. Description of the Related Art Conventionally, in a fan housing containing a small fan motor, a plurality of lead wires for connecting a motor circuit board and an external power supply are wired along an inner surface of the fan housing, and a lead wire is provided on the inner surface. It was fixed by bonding or the like. Then, the terminal portion of the lead wire is drawn out of the housing from the radial through hole formed in the outer peripheral wall of the fan housing and connected to an external power supply or the like.

[0003]

However, if the lead wire is fixed by bonding or the like, the lead wire rises from the inner surface of the fan housing, and the lead wire is rubbed and damaged by the rotating fan blades. There is a problem that the wind generated by the fan blows out from the gap of the through hole also in the outer diameter direction and generates noise.

Accordingly, an object of the present invention is to provide a fan motor which solves such a conventional problem.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fan mounting device which is disposed at an outer peripheral wall portion and a central portion.
It has a wall and a plurality of arms that connect the two radially.
A fan housing,
On the surface, a flat-plate annular substrate main body and an outer radial direction from the main body
Motor circuit board consisting of a strip-shaped lead
Attached to, and to form a part of the notch of the outer peripheral edge of the peripheral wall portion, a slit communicating the cutout portion and the internal the fan housing one of the said arm portion
Formed at the connecting portion between the arm portion and the outer peripheral wall portion, and further, the lead portion comes close to or abuts the inner surface of the arm portion.
The distal portion of the lead portion is inserted into the slit together thereby, the cover piece for fixing the distal end of the lead portion 24 is fixed to the cutout portion, the wiring connection lands provided on the distal end of the lead portion 24 It surrounds the part.

[0006]

By simply inserting the tip of the lead into the slit and fixing the cover piece to the notch, the relative rotation of the Hall element of the motor circuit board and the stator corresponding to each Hall element in the rotational direction is achieved. Positioning can be performed, and the lead portion is fixed in a state of being close to or in contact with the inner surface of the fan housing, so that the lead portion does not rub against the rotating fan blades.

[0007] The cover piece protects the connection portion of the land portion, and the notch portion becomes hermetically closed, so that the wind generated by the fan in the outer radial direction can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing embodiments.

In FIG. 1 which is an enlarged front sectional view of the fan motor according to the present invention, and in FIG. 2 which is a plan view thereof, reference numeral 1 denotes a small (for example, a 40 mm square and about 10 mm thick) box having an opening on one side. Shaped plastic fan housing.

The fan housing 1 has a substantially square outer peripheral wall 3 surrounding the outer periphery of the fan 2, a fan mounting wall 5 having a cylindrical boss 4 projecting therefrom, and a circular fan mounting wall. 5 and a plurality of arms 6 radially connecting the outer peripheral wall 3 to each other.

The arms 6 are flat and have only one wide arm 6a. Also, the fan mounting wall 5
Are thinner than the thickness of the arms 6.

The fan mounting wall 5, the outer peripheral wall 3, and the arms 6 form ventilation openings 7.

The fan 2 comprises a bowl-shaped base 8 and a plurality of blades 9 projecting from the outer peripheral surface of the bowl-shaped base 8. Inserted and fixed.

A boss 4 at the center of the fan housing 1
A cylindrical sleeve 11 is fixed to the inner peripheral surface of
A rotating shaft 10 is rotatably mounted on the sleeve 11 via the bearings 12 and 12.

A rotor holder 13 and a rotor magnet 14 are fixed inside the bowl-shaped base portion 8 so as to fit inside. Stator core 15
A stator 17 composed of the stator coil 16 and the stator coil 16 is fixed to the sleeve 11 so as to fit close to and facing the rotor magnet 14, and the fan 2 rotates in a predetermined direction.

Numeral 18 denotes a stator positioning projection protruding from the end face of the boss 4 and is fitted into a notch 19 formed on the inner periphery of the stator core 15.

Reference numeral 20 denotes a thin motor circuit board (having a thickness A of about 0.6 mm). As a material of the motor circuit board 20, for example, a flexible film or the like can be used. It is desirable to use an epoxy resin containing glass fiber or the like so that the substrate is not bent.

The motor circuit board 20 to which the terminal of the stator coil 16 is electrically connected includes a Hall element 21 and a drive I
It comprises a flat plate-shaped annular substrate main body 23 having various electronic components such as C22 and a conductor pattern for wiring, and a strip-shaped lead 24 extending from the substrate main body 23 in the outer diameter direction.

The lead portion 24 has a conductor pattern (as a lead wire) connected to the above-mentioned various electronic components and the like.
An appropriate number of them are formed at the tip of the lead part 24.

FIG. 3 is an enlarged view of a main portion near a connecting portion between the arm portion 6a and the outer peripheral wall portion 3. FIG.
Is formed with a notch 26 that is depressed in a concave shape.

Protrusions 27 are provided on the left and right vertical sides of the notch 26.
a and 27b are formed, and the flat bottom surface 28 is formed substantially parallel to the end surface 3a of the outer peripheral wall portion 3. The notch 26 has a curved surface 29 slightly projecting in the outer diameter direction.

A slit 30 adjacent to the curved surface 29 is formed by the arm 6a and the notch 26, and connects the notch 26 with the inside of the fan housing 1.

Specifically, the slit 30 is provided in the arm 6a.
The connecting portion between the outer peripheral wall 3 and the outer peripheral wall 3 is cut out by a predetermined length along the inner peripheral surface of the outer peripheral wall 3.

Thus, the supporting wall portion 31 formed by leaving the outer peripheral wall portion 3 with a slight radial thickness (for example, 1 mm),
Only one side edge of the arm 6a is connected.

The width B of the slit 30 is determined by the lead portion.
24 so that the thickness A of the motor circuit board 20 can be inserted.
The size is slightly larger than the size.

Reference numeral 32 denotes a cover piece made of plastic that fits into the notch 26, and a portion corresponding to the bottom surface 28 of the notch 26 is open.

The front wall 33 of the cover piece 32 is formed with a recess 34 for inserting an external wiring, and the left and right side walls 35 and 36 are formed with mountain-shaped ridges 37 a and 37 b and a cutout 26. And concave step portions 38a and 38b fitted to the convex step portions 27a and 27b.

The rear wall portion 39 of the cover piece 32 has a shape along the curved surface 29 and the inner peripheral surface of the outer peripheral wall portion 3.

When the cover piece 32 is fitted in the notch 26, as shown in FIG. 1 and FIG.
The height dimension of the rear wall portion 39 is set so that a gap having a width dimension C is generated.

The width C is set so that the rear wall 39 abuts on the lead 24 inserted through the slit 30.
It is set to be approximately the same as the thickness dimension A of 20.

In order to fix the motor circuit board 20 to the fan housing 1, as shown in FIG. 3, the leading end of the lead 24 is inserted into the slit 30, and the lead 24 is brought into contact with the curved surface 29. Then, as shown in FIG. 1, the substrate main body 23 is externally fixed to the outer peripheral edge of the stator core 15 via a mounting rod or the like fixed to the stator 17.

Further, as shown in FIGS. 1 and 2, external wires 40 are connected to the lands 25 at the tips of the lead portions 24 by soldering or the like, and then the external wires 40 are drawn out of the recesses 34. ,
The cover piece 32 is fixed to the notch portion 26 by welding, bonding, caulking, or the like, and the tip of the lead portion 24 is fixed.
Is fixed to the fan housing 1.

As a result, the lead portion 24 is securely fixed to the fan housing 1 in a state in which the lead portion 24 comes close to or abuts on the arm portion 6a (without lifting), and is attached to the tip end of the lead portion 24 by the cover piece 32. The provided land portions 25 are surrounded.

Therefore, the land portion 25 is formed by the cover piece 32.
And the external wiring 40 can be protected and the notch
26 is substantially closed, and the wind generated by the fan 2 hardly blows in the outer diameter direction.

That is, the wind is weakened by the front and rear wall portions 33 and 39 of the cover piece 32 to prevent the air from directly blowing in the outer diameter direction. Further, in the case of the cover piece 32 in the shape of the figure, if the gap formed between the notch 26 and the cover piece 32 in the fitted state is filled with an adhesive, and the cover piece 32 is bonded to the notch 26, It can be firmly fixed, and the degree of sealing can be further improved.

As described above, when the lead portion 24 inserted through the slit 30 is brought into contact with the curved surface 29 (see FIG. 3), at the same time, the Hall elements 21. The teeth of the stator core 15 corresponding to each Hall element 21 are set so as to face each other, so that relative positioning in the rotation direction can be easily performed.

[0037]

[Effect of the Invention] The present invention is constructed as described above, and thus has the following remarkable effects.

The connection between the lands 25 and the external wirings 40 can be insulated and attached and protected, and the notch 26 becomes hermetically closed, so that the wind generated by the fan 2 is directed in the radial direction of the fan housing 1. Noise can be effectively prevented.

The relative positioning of the Hall element 21 and the stator 17 of the motor circuit board 20 in the rotational direction can be easily performed, and the workability is improved.

Since the lead portion 24 is securely fixed to the fan housing 1 in a state where the lead portion 24 is close to or in contact with the arm portion 6a, the lead portion 24 is not rubbed by the blade 9 of the fan 2 and the reliability of the motor is reduced. Is improved. In particular, the present invention is effective in a small fan motor having a small space for mounting each component.

[Brief description of the drawings]

FIG. 1 is an enlarged front sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of the same.

FIG. 3 is an enlarged perspective view of the vicinity of a notch.

FIG. 4 is an enlarged view of a main part showing a state in which a cover piece is fixed to a notch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fan housing 3 Outer peripheral wall part 5 Fan mounting wall part 6 Arm part 6a Arm part 20 Motor circuit board 23 Main board part 24 Lead part 25 Land part 26 Notch part 30 Slit 32 Cover piece

Claims (1)

(57) [Scope of request for utility model registration] An outer peripheral wall portion and a central fan portion;
Wall 5 and a plurality of arms 6 radially connecting the two
And a fan housing 1 having a fan housing
On the inner surface of the jing 1, a flat plate-shaped annular substrate body 23 and the book
A strip-shaped lead portion 24 extending in the outer radial direction from the body portion 23;
And a motor circuit board 20 made of
A notch 26 is formed in a part of the outer peripheral edge of the wall 3 ,
Cutout portion 26 and the fan housing 1 a slit 30 for communicating the inside the arm portions 6 one A of
Formed at a connection portion between the arm portion 6a and the outer peripheral wall portion 3, and furthermore, the lead portion 24 is located near the inner surface of the arm portion 6a.
Contact or causes abut inserting the distal end of the lead portion 24 in the <br/> slit 30, the cover piece 32 for fixing the distal end of the lead portion 24 and fixed to the notch portion 26, the lead A fan motor surrounding a wiring connection land portion 25 provided at a tip end of the portion 24.