JPH0323810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electric motor, and in particular to a structure of a fixed part between a stator and a housing.

[Conventional technology and its problems]

Conventionally, to fix the stator to the housing,
This was done by joining with adhesive or screwing. However, these methods have problems in that they cannot be securely fixed and require extra effort in the assembly process.

The present invention relates to an electric motor that solves the above problems.

[Means to solve the problem]

The present invention provides a concave-convex locking mechanism on the inner periphery of the upper or lower insulator and the outer periphery of the bearing support tube of the housing, and fixes the legs hanging from the lower insulator to the stator board.
The legs or the protrusions are arranged such that the contact points between the stator substrate and the protrusions on the inner bottom surface of the housing are shifted from the fixing points of the legs and the stator substrate.

[Effect]

The bearing support tube of the housing is inserted into the shaft hole of the stator from the substrate side, and the uneven locking mechanism is engaged by applying an appropriate pressing force in the axial direction. At the same time, the legs hanging from the lower insulator and the stator board fixed to the legs are each slightly elastically deformed, and as the boards come into contact with the protrusion on the inner bottom of the housing with a predetermined pressure, the stator is securely fixed to the housing.

〔Example〕

Embodiments of the present invention will be explained in detail based on the drawings.

In FIGS. 1 and 2, 1 is a housing and 2 is a bearing support tube. The support tube 2 is disposed in a protruding manner in a recess 3 in the housing 1, and the bearing support tube 2 is installed and fixed to the housing 1 within the recess 3. Annular protrusions 7 are attached to the inner circumferential portion of the upper insulator 5 of the stator 4 and the outer circumferential portion of the bearing support tube 2 of the housing 1 at corresponding positions during assembly, respectively, and constitute a concavo-convex locking mechanism 8. The annular protrusion 6 may be provided on the lower insulator 9 as shown in FIG. 3, and the annular protrusion 7 may be provided on the bearing support tube 2 at a corresponding position.
An appropriate number of legs 10, 10 are suspended from appropriate positions (described later) on the lower surface of the lower insulator 9, and a stator board 11 on the surface of which electronic components such as capacitors are attached is attached to the lower end of the legs 10, 10.
is fixed. Projections 12, 12, . . . arranged at predetermined positions on the inner bottom surface of the housing 1 are in elastic contact with the back surface of the stator board 11. here,
To explain the positional relationship between the leg 10 and the protrusion 12 in a plan view, FIG. The circumferences C and C shown by imaginary lines where the contact points P between the protrusion 12 and the substrate 11 are respectively arranged are within the range where the radii r and R centering on the rotation center O of the rotor 13 are different by an appropriate length. determined. Alternatively, when they are arranged on the same circumference C as shown in FIG. 5, the contact point P is set at a position offset from the fixed point Q.

The upper and lower insulators 5 and 9 are integrally formed with the leg body 10 from an insulating elastic member such as plastic, and the laminated iron core 1 therein is formed integrally with the leg body 10.
It covers most of the surface of 4. 15 is an armature coil, and the rotor 13 is disposed within the recess 3 of the housing 1 and on the outer circumferential side of the stator 4. A fan 17 is integrally provided around the support frame 22, and a magnet 16 is disposed within the support frame 22, with a rotor 23 interposed therebetween, in close proximity to the outer periphery of the laminated iron core 14. Reference numeral 18 denotes a rotating shaft of the rotor 23, which is inserted through bearings 19, 19 held in the bearing support tube 2 of the housing 1, and is rotatably supported. 20 is a disc spring, 21 is a washer, and 24 is a retaining ring. Note that a rotor position detector 25 such as a magnetic sensor is attached to the substrate 11 to intermittent the current flowing through the coil 15 of the stator 4 .

Thus, the stator 4 is fixed by being applied with an appropriate elastic pressing force. In other words, the annular convex portion 6
When the annular recess 7 is engaged with the housing 1
The protrusion 12 on the inner bottom surface and the stator board 11 are in contact with each other with a predetermined pressure, the legs 10 and the board 11 are in a slightly elastically deformed state, and the stator 4 and the housing 1 are securely fixed. Set dimensional tolerances as follows. The base plate 11 and the protrusion 12 on the inner bottom have the same effect as if they were fixed with screws, and no minute vibrations occur. Therefore, under normal use, the stator 4 automatically moves into the housing. It will never deviate from 1. In order to remove the stator 4, the upper end of the upper insulator 5 is expanded in diameter, and the stator 4 is lifted up so that it can be pulled out from the bearing support tube 2 very easily.

As another example, as shown in FIG. 6, an annular recess 7 is formed at a predetermined position on the inner periphery of the upper insulator 5, and an annular protrusion 6 is formed on the outer periphery of the bearing support tube 2 corresponding to this part in the assembled state. There is no problem even if the uneven locking mechanism 8 is provided and configured. Further, the annular convex portion 6 may be replaced with a plurality of protrusions (not shown).

As mentioned above, since no screws or adhesives are used to fix the stator 4 to the housing 1,
It can be disassembled if necessary for repair or inspection, and it can be disassembled very easily.

Furthermore, any slight contraction in the axial direction during assembly is completely absorbed by the elastic deformation of the legs 10 and the base plate 11, so that other parts of the stator 4 are not unduly affected by stress. It is assembled and fixed to the housing 1 in a natural state.

[Effect of idea]

As described above, in the present invention, it is only necessary to insert the bearing support tube 2 of the housing 1 into the stator 4, and the assembly and fixation can be performed with one touch. Therefore, compared to conventional fixing structures using screws or adhesives, it is possible to increase work efficiency in the manufacturing process up to the completion of motor assembly, and has the effect of making it possible to reduce the number of processes.

In addition, since the stator 4 is attached elastically by the elastic deformation of the legs 10 and the stator board 11, the stator 4 is securely fixed to the housing 1, and there is no possibility of loosening of the screws in the conventional screw fastening structure or cracks in the adhesive. This has the effect of completely eliminating failures caused by poor installation.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the present invention, Fig. 2 is an exploded view of the arrangement of Fig. 1, Fig. 3 is a sectional view of main parts showing another embodiment, Figs. 4 and 5. 6 is a plan view showing a difference in the planar arrangement of the legs and the protruding portion, and FIG. 6 is an enlarged sectional view of a main part showing still another embodiment. 1...Housing, 2...Bearing support tube, 5...
Upper insulator, 8... Uneven locking mechanism, 9...
...Lower insulator, 10...Leg body, 11...
Stator board, 12... protruding portion, P... contact point,
Q...Fixed point.

Claims (1)

[Scope of utility model registration request] A concave-convex locking mechanism 8 is attached to the inner circumference of the upper or lower insulators 5 and 9 and the outer circumference of the bearing support tube 2 of the housing 1, and the lower insulator 9
At the same time, the leg 10 hanging down from the stator board 11 is fixed to the stator board 11, and the contact point P between the stator board 11 and the protrusion 12 on the inner bottom surface of the housing 1 is fixed to the stator board 11. An electric motor characterized in that the legs 10 or the protrusions 12 are respectively arranged so as to be offset from a point Q.