JPH0135577Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a flat motor, and particularly relates to an improvement in a casing mounting structure.

(Prior Art) A flat motor as shown in FIG. 4 is generally used as a fan motor used for cooling an automobile radiator or condenser.

This flat motor M is provided with an annular magnet 2 fixed to the inner end surface of a closed casing 1, which is made up of a pair of substantially flat dish-shaped casing pieces 1a and 1b placed together, and provided within the closed casing 1. Flat armature 3, commutator 4
A rotor part 7 fixed to a shaft 6 via a rotor hub 5 and a brush 8 whose tip abuts on the commutator 4 are supported by a cylindrical brush holder 9, and this brush holder 9 is supported by a rubber brush holder support. 10 through said casing piece 1
It has a brush holding device 11 attached to b.

In addition, in the figure, 12 is a bearing, and f is a fan.

(Problem to be solved by the invention) However, in the conventional flat motor M, when constructing the casing 1, the outer peripheral edge 13 of one casing piece 1a is bent at several places onto the other casing piece 1b. However, it is fixed by caulking. In addition, when performing this caulking fixation,
Outer peripheral end 14 of the other casing piece 1b
Step 15 (sixth part) of one casing piece 1a
(see figure).

When performing such caulking fixation, since both casing pieces 1a and 1b are made of iron plates, spring back must be taken into account. However, if this spring back is taken into account unnecessarily, The pressing force F on the portion 13 is too large, and there is a risk that the casing piece 1b pressed by this pressing force F may be deformed as shown by the broken line in FIG. 5, and the stepped portion 15 itself may also be deformed. This results in a deviation in the length l (hereinafter referred to as thrust amount) of the casing 1 in the shaft direction.

If a deviation occurs in the thrust amount l, the bearings 12 and 1 are moved by the casing pieces 1a and 1b.
Bearing support part 16, 1 formed to support 2
6 becomes incomplete, which causes noise when the motor rotates.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a flat motor in which the pressurizing force when performing the caulking fixation does not become unnecessarily large.

(Means for Solving the Problems) The present invention has been made to achieve the above object, and includes a flat armature and a commutator placed in a closed casing consisting of a pair of flat plate-shaped casing pieces through a rotor hub. A flat motor is provided with a rotor fixed to a shaft, and the shaft is rotatably supported with respect to the sealed casing via a bearing. the outer periphery of the other casing piece is brought into contact with the stepped portion, and an elastic member is interposed between the outer periphery of the other casing piece and the outer periphery of the one casing piece. The present invention is characterized in that the outer peripheral edge of the one casing piece is caulked.

(Function) If such a means is adopted, the pressurizing force at the time of caulking will be transmitted to the other casing piece via the elastic member, so this pressurizing force will not become larger than necessary, and the thrust amount l will not be deviated. The risk of this occurring is eliminated.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a half-sectional view showing one example of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG.
6 The same members as those shown in Figure 6 are given the same reference numerals.
The explanation will be omitted.

This motor M has a mounting structure for a casing 1 as shown in FIGS. 1 and 2. One casing piece 1a has an outer peripheral edge 13 formed at a predetermined location on the outer periphery, projecting from the main body of the casing piece 1A. A stepped portion 15 is formed at the base of this outer peripheral edge portion 13, and the other casing piece 1
The outer peripheral edge portion 14 of b is brought into contact with the outer peripheral edge portion 14 of b.

Particularly in this embodiment, the outer peripheral edge portion 13 is bent to the other casing piece 1b, but in this case,
This is done via an elastic member 18 interposed between the outer peripheral edge 13 and the other casing piece 1b.

In this way, the other casing piece 1
b does not receive the pressing force F directly, but is pressed via the elastic member 18. Therefore, this pressing force will be absorbed to some extent by the elastic member 18, and the crimping work will be performed while adjusting the pressing force F, so the degree of freedom during the crimping work will increase, and the above-mentioned thrust amount l This means that the settings can be easily performed.

In this way, if the thrust amount l can be set accurately, the bearings 12, 12 will be supported accurately, and even if the shaft 6 passing through the bearings 12, 12 rotates, the bearings 12, 12 will not generate noise. It will rotate smoothly.

Incidentally, according to experiments, when caulking is performed properly and the thrust amount l is a predetermined value, the result shown by the solid line A in FIG. 3 is obtained, but when the thrust amount l has an error of about 0.12 mm, The result is shown by broken line B. As is clear from this result, there is a clear difference between the two in terms of noise.

In the above-mentioned embodiment, the outer peripheral edge 13 is simply bent into the casing pieces 1a, 1b, but as shown in FIG.
If the elastic member 18 is crimped with a slight inclination, it is possible to prevent the elastic member 18 from falling off.

(Effect of the invention) As is clear from the above explanation, according to the invention, the outer peripheral edge of one casing piece is bent onto the other casing piece, and this outer peripheral edge is
Since the other casing piece is pressurized with a predetermined force via an elastic member interposed between the outer peripheral edge and the other casing piece,
The amount of thrust can be set to a predetermined value, so that the bearing can be supported with high precision and the noise generated when the motor rotates can be minimized. Furthermore, since this elastic member itself exhibits a soundproofing effect, the motor noise can be further reduced.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view showing an embodiment of the present invention;
Figure 2 is an enlarged sectional view of the main part of Figure 1, and Figure 3 is
A graph showing the experimental results of the same example, FIG. 4 is a vertical cross-sectional view showing the conventional motor, FIG. 5 is a schematic diagram showing the caulking state of the conventional motor, and FIG.
It is an enlarged view of the main part of the figure. DESCRIPTION OF SYMBOLS 1... Sealed casing, 1a, 1b... Casing piece, 3... Flat armature, 4... Commutator, 5... Rotor hub, 6... Shaft, 12... Bearing, 13... Outer peripheral edge, 18...
Elastic member.

Claims (1)

[Scope of utility model registration request] A pair of flat plate-shaped casing pieces 1
A rotor part in which a flat armature 3 and a commutator 4 are fixed to a shaft 6 via a rotor hub 5 is provided in a sealed casing 1 consisting of a and 1b, and the shaft 6 is connected to the sealed casing via bearings 12, 12. In the flat motor rotatably supported, a stepped portion 15 is formed on the inner circumferential surface of the outer peripheral edge portion 13 of the one casing piece 1a, and the other casing piece 1 is formed in the stepped portion.
b, and an elastic member 18 is interposed between the outer circumferential edge 14 of the other casing piece 1b and the outer circumferential edge 13 of the one casing piece 1a. A flat motor characterized in that an outer peripheral edge 13 of a casing piece 1a is caulked.