JP2521607Y2 - DC motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a small DC motor such as a brushless motor.

[Problems to be solved by conventional techniques and devices]

In a conventional brushless motor such as a small fan motor, in order to fit and fix the stator assembly to the cylindrical portion of the housing in an external fitting manner, apply an adhesive agent or fix it by caulking. Was there.

In such a conventional fixing method, adhesive coating work or caulking work is required, the work efficiency is poor, and the occurrence rate of defects is relatively high.

[Means for solving the problem]

In order to solve such conventional problems, the present invention provides
An engagement groove is formed in the tubular portion of the housing, and a retaining ridge that elastically deforms and engages with the engagement groove is formed from the inner peripheral surface of the cylindrical wall portion of the insulator covered by the stator core. Provided on the cylindrical wall portion is a small bending portion for elastic deformation, which protrudes toward the inner side of the cylindrical wall portion and allows the elastic deformation outward of the portion of the cylindrical wall portion corresponding to the retaining ridge in the radial direction. Further, the stator core is provided with an axial small groove that is in line with the small groove on the inner surface side of the elastic deformation small curved portion, and the outer peripheral surface of the cylindrical portion is engaged with the small groove of the insulator and the axial small groove of the stator core. Providing a matching ridge.

[Action]

If the stator assembly with the insulator, coil windings, etc. assembled on the stator core is pushed into the tubular part of the housing in an externally fitted shape, the retaining ridges on the inner peripheral surface of the insulator will become
It is fitted while being elastically deformed, and is elastically restored at the position of the engaging groove of the cylindrical portion and locked. This prevents the shaft from coming off. At this time, the portion of the cylindrical wall portion corresponding to the retaining ridge is elastically deformed outward in the radial direction, so that the retaining ridge can be more easily engaged with the engaging groove. That is, the stator assembly and the housing can be assembled with one touch. Further, when assembled, the projection of the cylindrical portion of the housing is engaged with the small groove of the insulator and the small groove of the stator core in the axial direction, so that circumferential positioning with respect to the housing is performed. Further, since the retaining ridge is provided inside the cylindrical wall portion, it is easy to wind the coil winding, and furthermore, the coil winding is wound around the stator core with the insulator attached to form the stator assembly. After that, it can be assembled to the tubular portion of the housing.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

In FIGS. 1 and 7, reference numeral 2 denotes a tubular portion provided in the housing 1 having a substantially short cylindrical shape, and the end wall (as shown in FIG. 5).
A cylindrical shape extends from approximately the center of 33. An engagement groove 3 is provided in the vicinity of the tip of the tubular portion 2 over the entire circumference thereof, and is provided to prevent rotation in the axial direction from the base end to the intermediate portion of the outer peripheral surface of the tubular portion 2. A pair of ridges 4, 4 are formed. The ridges 4, 4 have a substantially semicircular cross section and extend in the axial direction of the tubular portion 2.

Reference numeral 5 denotes a stator assembly, which is formed by covering the stator core 6 with a pair of plastic insulators 7 and 8 having different shapes on both sides in the axial direction so as to have an insulation property, and by winding a coil winding 9 thereon. , Composed. The stator assembly 5 is externally fitted into the tubular portion 2 of the housing 1 in the direction indicated by the arrow A to be assembled. In the embodiment, a pair of retaining ridges 12, 12 are previously projected from the inner peripheral surface of the cylindrical wall portion 10 of the insulator 7--that is, the inner peripheral surface of the fitting hole portion 11--to the inner side of the cylindrical wall portion 10. It is set up. Retaining ridge
12, 12 has inner protrusions 12a, 12a protruding inward in the radial direction and locking portions 12b, 12b protruding upward substantially vertically from the free ends of the inner protrusions 12a, 12a, and the cylindrical wall It is formed integrally with the portion 10 (see FIG. 2). When the stator assembly 5 is pushed in in the direction of arrow A, the locking portions 12b, 12b of the ridges 12, 12 are elastically deformed to engage with the engagement groove 3 of the tubular portion 2 and thus the stator. The assembly 5 is attached to the tubular portion 2 of the housing 1. In such a mounted state, the locking portions 12b, 12b of the ridges 12, 12 are positioned in the engagement groove 3 of the tubular portion 2, and the stator assembly 5 is reliably prevented from coming off the tubular portion 2. I can.

As shown in FIG. 1 to FIG. 4, the cylindrical wall portion 10 of the insulator 7 is provided with elastically deforming small curved portions 13 and 13 which are curved outward in the radial direction in a substantially semicircular convex shape at 18 ° symmetrical positions. Axial small grooves 14, 14 formed by the inner surfaces of the small curved portions 13, 13
Corresponds to the small axial grooves 15, 15 of the stator core 6. At the edge that defines the slot of the insulator 7,
Each of them is provided with a positioning protrusion 7a protruding downward. When the positioning protrusion 7a is positioned in the slot of the stator core 6 and the insulator 7 is mounted, the small groove 1
4,14 and the small grooves 15,15 form a straight line. Further, when the stator assembly 5 is attached to the tubular portion 2, the pair of ridges 4, 4 of the tubular portion 2,
4 engages with the small grooves 14, 14 of the insulator 7 and the small grooves 15, 15 of the stator core 6, and these perform circumferential positioning with respect to the housing 1. That is, it functions as a match mark of the core.

Further, as shown in FIG. 2, the retaining ridge 12 is formed on the cylindrical wall portion.
Between the 10 and the locking portion 12b, elastic deformation escape groove portion 1 at the time of engagement
6, and the groove portion 16 opens in the direction opposite to the arrow A direction. Further, the substantially L-shaped retaining ridge 12 has a rounded rounded portion 17 at a connecting portion between the inner protruding portion 12a and the locking portion 12b in order to facilitate insertion, and further, the locking portion 12b. Is thinly formed on the tip. Further, as is clear from FIG. 4, when viewed from the axial direction of the insulator 7, the retaining ridges
The central angle θ of each of 12 and 12 is 90 ° to 140 °, and has an arc shape, and when pressed in the direction of arrow A to be fitted onto the cylindrical portion 2 of the housing 1, a symmetrical arc shape retaining stopper. Ridge 12,1
2 is elastically deformed so as to escape in opposite directions-outer diameter direction. At this time, the cylindrical wall portion 10 has a small curved portion for elastic deformation.
Since 13, 13 are provided, elastic deformation of the portion corresponding to the retaining ridge of the cylindrical wall portion 10 in the radial direction is allowed, and the elastic deformation of the retaining ridges 12, 12 is further facilitated. It
That is, it is easily elastically deformed in the direction of the arrow M in FIG. 1, which facilitates mounting of the stator assembly 5 on the tubular portion 2.

Next, FIG. 5 shows a main part of the housing 1 and a stator assembly 5 assembled to the housing 1.
It can be clearly seen that the retaining ridges 12, 12 are locked in the concave groove 3 of the tubular portion 2. It can also be seen that the ridges 4, 4 of the tubular portion 2 and the small curved portions 13, 13 of the insulator 7 correspond to each other. Thus, the housing 1 is provided with a substantially cylindrical standing wall 18 extending substantially vertically from the outer peripheral edge of the end wall 33,
The standing wall 18 and the outer peripheral surface 19 of the teeth portion of the stator core 6
A space T in which a rotor cylinder including a rotor magnet and the like is wound with a predetermined gap is formed between and. The upright wall 18 has a pair of screw head relief portions 21, 21 that are slightly curved toward the inner diameter side in order to escape the mounting screws 20, 20. Reference numerals 22 and 22 denote mounting protrusions of the housing 1.

Reference numeral 32 represents a circuit board, and the circuit board 32 is a sixth board.
As is apparent from FIGS. 5 and 5, there are positioning match marks 23, 23 cut out in a small arc shape.
Correspond to the pair of screw head relief portions 21, 21 and engage with each other. That is, each of the projecting portions of the screw head relief portions 21, 21 in the inner diameter direction serves as a match mark of the circuit board 32, and the screw head relief portion 21 is eventually "the escape of the screw head" and "circuit". It can be said that it also serves as (is shared with) the “matching mark for substrates”. The circuit board 32 is provided with a Hall element or the like for controlling the rotation of the rotor. With this configuration, the shape and structure of the housing can be simplified and made compact.

INDUSTRIAL APPLICABILITY The present invention is suitable for small DC motors such as cross fans for copying machines and air conditioners. In addition, screw 20 ..., escape portion 21
The number of ... And the match mark 23 can be increased or decreased. Further, the retaining ridges 12 ... Can be freely divided into more parts.

[Effect of device]

The present invention has the following significant practical effects due to the above configuration.

The stator assembly can be fixed to the housing 1 with one touch without using an adhesive. At this time, the portion of the cylindrical wall portion 10 corresponding to the retaining ridge is also elastically deformed outward in the radial direction,
External fitting of the stator assembly to the housing 1 can be smoothly performed. Moreover, the retaining ridge 12 firmly and reliably engages with the engaging recessed groove 3, and the retaining is prevented reliably.

Since the protrusion 4 of the tubular portion 2 of the housing 1 is engaged with the small groove 14 of the insulator 7 and the small groove 15 of the stator core 6 in the axial direction, accurate positioning is possible.

Coil winding 9 is easy to wind, and moreover, coil winding 9
Can be assembled to the tubular portion 2 of the housing 1 after forming the stator assembly by winding. Thus, the assembly of the motor as a whole is extremely easy.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part, FIG. 3 is an exploded perspective view of the main part, FIG. 4 is a plan view of an example of an insulator, and FIG. 6 is a plan view of an example of a circuit board, and FIG. 7 is an exploded explanatory view. 1 ... Housing, 2 ... Cylindrical part, 3 ... Engagement groove, 6 ...
… Stator core, 7 …… Insulator, 11 …… Mating hole, 12 …… Steep line.

Claims (1)

(57) [Scope of utility model registration request] 1. An engaging groove 3 is formed in a cylindrical portion 2 of a housing 1, and the engaging groove is elastically deformed from an inner peripheral surface of a cylindrical wall portion 10 of an insulator 7 covered by a stator core 6. 3, a retaining ridge 12 engaging with 3 is provided on the inner side of the cylindrical wall portion 10, and the portion of the cylindrical wall portion 10 corresponding to the retaining ridge is allowed to elastically deform outward in the radial direction. An elastically deforming small curved portion 13 is provided on the cylindrical wall portion 10, and an axial small groove 15 that is in line with a small groove 14 on the inner surface side of the elastic deforming small curved portion 13 is provided on the stator core 6. At the same time, the DC motor is characterized in that the outer peripheral surface of the cylindrical portion 2 is provided with a ridge 4 which engages with the small groove 14 of the insulator 7 and the axial small groove 15 of the stator core 6.