JPH0223076Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric fan motor installed to rotationally drive a blower blade, and in particular, the stator core having a rectangular shape is press-fitted into a frame having the shape of a cylindrical container. The present invention relates to a fan motor with improved support shaft attachment structure and stator core press-fit structure.

[Technical background of the invention]

BACKGROUND ART Conventionally, a motor for this type of electric fan has been installed in a head cover of the electric fan so as to rotate a blowing blade located in front of the cover. In recent years, however, in the motors for such electric fans,
Some stator cores are formed by press-fitting a stator core formed into a square shape into a frame formed into a cylindrical container shape by pressing a steel plate, etc., and in this case, a support shaft for supporting the entire stator core is provided. The structure is such that it is attached to the frame by caulking it to a mounting plate that is separate from the frame, and then attaching the mounting plate to the frame by spot welding or the like.

[Problems with background technology]

However, according to the above-mentioned conventional method, since the attachment of the support shaft requires a mounting plate separate from the frame and its separate installation, there is a problem of high cost first, and also that it is difficult to assemble. There was a problem that the work itself was troublesome, and there was also a problem that assembly accuracy was difficult to achieve, such as there was a lot of concern that the support shaft would be installed at an angle.

[Purpose of invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the cost and simplify the assembly work for the support shaft attachment structure, and to improve the assembly accuracy. In addition, it is an object of the present invention to provide an electric fan motor in which high air gap accuracy between a stator core and a rotor core can be obtained.

[Summary of the idea]

In the present invention, a spindle caulking part is formed in the lower part of the frame, and a hole for inserting a caulking tool is formed in the upper part opposite to the spindle caulking part, and the flat part of the stator core is rectangular. The spindle is press-fitted into the cylindrical container-shaped frame so as to face the spindle that is caulked to the spindle caulking portion, so that the spindle is caulked directly to the frame, and the caulking portion This feature is characterized in that the stator core can be assembled into the frame with high precision while avoiding such problems.

[Example of idea]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. First, in FIG. The arranged head,
Reference numeral 4 denotes a blower blade disposed in front of the head 3, and 5 a guard surrounding the blower blade 4. Reference numeral 6 denotes a cover for the head 3, in which a motor 7, a gear reduction mechanism 8, and an oscillation mechanism 9 are disposed. Next, in FIG. 2 showing the motor 7 in detail, 10 is a frame, which consists of two parts, a front frame 10a and a rear frame 10b, both of which are made of pressed steel plates etc. It is formed into a cylindrical container shape by processing. In this case, as shown in FIG. 3, the front frame 10a has a flat part 11 formed at the lower part of the circumferential wall part at a level lower than other parts, and a hole 12 is formed approximately in the center of this flat part 11. The spindle caulking part 13 is formed by providing a spindle crimped part 13, and on the other hand, a hole 14 for inserting a caulking tool which is concentric with the hole 12 and has a larger diameter than the above hole 12 is provided in the upper part facing the spindle caulking part 13. It is shaped. Here, 15 is a support shaft, and the end above the stepped portion 15a is connected to the fourth shaft.
As shown by the two-dot chain line in the figure, a washer 1 is inserted into the hole 12 in the spindle caulking portion 13 of the front frame 10a.
6 and 17 from below, and on the other hand, a caulking tool 18 is inserted into the hole 14, and its tip crushes and expands the upper end of the support shaft 15, thereby forming the front frame 10a. spindle 1
5 is directly caulked. Reference numeral 19 denotes a stator core, which has a rectangular shape as shown in FIG. Each head 19a forming an arc shape is press-fitted into the front frame 10a and the rear frame 10b while being in pressure contact with the inner surfaces of the front frame 10a and the rear frame 10b. In the frame 10a, one of the flat portions 19b is press-fitted into the spindle crimped portion 13 so as to face the spindle 15 which is swaged. In addition, 20
2 is a rotor core disposed with a predetermined air gap 21 in the stator core 19, and 22 is a rotor shaft, and the blowing blade 4 is attached to one end of the rotor shaft 22 that protrudes forward and outside of the cover 6. The blower blade 4 is driven to rotate, and the neck piece 2 is provided with a cylindrical support shaft support portion 23 into which the support shaft 15 is inserted and supported.

Now, in the case of this embodiment configured as above,
The frame 10 of the motor 7, particularly the front frame 10a, is provided with a spindle caulking portion 13 at its upper portion, and a caulking tool 18 is provided at the upper portion of the portion facing the spindle caulking portion 13.
By forming the insertion hole 14, the support shaft 1
Since the support shaft 15 is directly caulked, there is no longer a need for a mounting plate separate from the frame or its separate attachment, as in the past, and costs can be reduced. It can be achieved and
It is possible to simplify the assembly work, and
Assembling accuracy can also be improved, and tilting of the support shaft 15 does not occur. In this case, the square stator core 19 is attached to the front frame 10a at its corner 19a.
When one of them is press-fitted into the support shaft caulking portion 13 so as to face the support shaft 15 caulked, the front frame 1
Only the remaining three corners of the stator core 19 come into pressure contact with the inner surface of the stator core 0a, making it impossible to assemble the stator core 19 with high precision. The center of the rotor core 20 supported by the front frame 10a is misaligned, and this misalignment causes the air gap 21 to become uneven and deteriorate its characteristics. However, in the case of this embodiment, the stator core 19 is press-fitted into the spindle caulking portion 13 so as to face the spindle 15 caulked, and as a result, all four corners 19a of the stator core 19 come into pressure contact with the inner surface of the front frame 10a. The center of the stator core 19 and the center of the rotor core 20 can be precisely matched, and the air gap 21 can be made uniform, without deterioration of characteristics.

The present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the gist.

[Effects of the invention] As is clear from the above, the present invention provides a motor for an electric fan that has a rectangular stator core press-fitted into a cylindrical container-shaped frame, has a support shaft at the bottom, and is installed to rotate the blower blades. In this case, a spindle caulking part is formed in the lower part of the frame, and a hole for inserting a caulking tool is formed in the upper part opposite to the spindle caulking part, and the rectangular stator core is inserted into the flat part of the frame. is press-fitted into the frame so as to face the spindle caulked to the spindle caulking portion, so that the spindle can be caulked directly to the frame, and This allows the stator core to be assembled into the frame with high precision while avoiding caulking parts.
It is possible to reduce the cost and simplify the assembly work for the attachment structure of the support shaft, and also to improve the assembly accuracy.At the same time, it is possible to obtain a high air gap accuracy between the stator core and the rotor core, which prevents deterioration of characteristics. It has excellent effects, such as no problems.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a side view of the entire electric fan, Figure 2 is an enlarged vertical sectional side view of the area around the motor, Figure 3 is an enlarged longitudinal sectional front view of the same part, and Figure 4 is the frame's spindle caulking part and the caulking tool insertion hole. FIG. In the figure, 4 is a blower blade, 7 is a motor, 10 is a frame, 10a is a front frame, 13 is a spindle caulking part, 14 is a hole for inserting a caulking tool, 15 is a spindle,
18 is a caulking tool, 19 is a stator core, 19a
19b is a corner portion of the stator core, and 19b is a flat portion of the stator core.

Claims (1)

[Scope of utility model registration request] A rectangular stator core is press-fitted into a cylindrical container-shaped frame, and a support shaft is provided at the lower part of the frame to rotate the blower blades. A hole for inserting a caulking tool is formed in a portion of the upper portion facing the spindle caulking portion, and the square stator core is configured such that its flat portion faces the spindle caulked to the spindle caulking portion. A fan motor, characterized in that it is press-fitted into the frame.