JPS6026424A - Small-sized motor - Google Patents

Abstract

PURPOSE:To eliminate the fluctuation of a bobbin with respect to a magnetic path piece by contacting or pressing in contact the collar of the bobbin with a bearing unit through a rib-shaped projection formed on either one of the bearing units for supporting the shaft of a rotor, at the side of the bobbin. CONSTITUTION:A rib-shaped projections 11a are formed on both positions near upper and lower positions of an inserting hole 10 at one end of the outer periphery of a collar 9 which constructs a synthetic resin bobbin 7. Bearing units 13a, 13b are associated with the shaft 5 of a rotor after the bobbin 7 is inserted fully to a magnetic path piece in a stator core 1. In this case, the end of the projection 11a is contacted or pressed in contact with the sides of units 13a, 13b at the side of the bobbin 7. In this manner, the bobbin can be secured without fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a small electric motor having a bobbin having an armature winding wound between a pair of collar portions.

Conventional structure and its problems A conventional small electric motor was constructed as shown in FIG. That is, in this FIG. 1, 1 is a stator core having a substantially U-shape with parallel magnetic path pieces 2&, 2b' (H). recesses 3a, 3b are provided in the recesses 3a and 3b to form a magnetic pole part, and the recesses s
The rotor 4 is placed at a and sb. 5a, 5t) ij
: A fixing hole for fixing a bearing body (not shown) that rotatably supports the shaft 6 of the rotor 4. 7 is a bobbin in which an armature winding 8 is wound.
It is attached by inserting it through a.

As described above, this type of small electric motor has a simple structure, and all that is required for assembly is to wind the armature winding 8 around the bobbin 7 in advance and insert it into the magnetic path piece 2a of the stator core 1. It's also easy. However, as shown in Fig. 2, the stator core 1 is made of laminated thin steel plates, so the stacked size A
There is variation in the l'lj dimension, and there is also variation in the punched width dimension B of the magnetic path pieces 2a, although the stacked dimension AJ: is small. Further, the dimensions C and D (d of the insertion hole 9, which is provided in the bobbin 7 shown in FIG. 3 and through which the magnetic path piece 2a of the stator core 1 is passed,
Compare the dimensions A and BE of A(C) respectively.

It is set as B<D. Therefore, the bobbin to which the magnetic path piece 22LK is inserted is loosely fitted to the magnetic path piece 2a, and as a result, abnormal noise is generated due to the drive of the electric motor, and vibrations of the electric motor are increased, causing noise from the equipment. This has drawbacks such as increased noise and wear and tear on the bobbin 7 and armature winding 8.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and eliminates the generation of extraneous noise caused by driving an electric motor with a simple structure without losing the conventional advantages of simple structure and easy assembly. The purpose is to provide a small electric motor that can prevent

Structure of the Invention In order to achieve all of the above objects, the present invention has a thin lip-like projection formed entirely on either the outer peripheral surface of the flange of the bobbin or the side surface of the bobbin of the bearing body that supports the shaft of the rotor. The flange of the bobbin and the bearing body are brought into full contact or pressure contact through a rib-like projection, and with this configuration, the action of the rig-like projection eliminates rattling of the bobbin against the magnetic path piece. It's something that can be done.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on FIGS. 4 to 8 a and b. Note that in FIGS. 4 to 8 a and 8 b, the same parts as in FIGS. 1 to 3 shown in the conventional example are given the same numbers, and only the points that are different from the conventional example will be explained.

First, in an embodiment shown in FIGS. 1 to 3 a and b,
Rib-like protrusions 11ai are formed on one end side of the outer peripheral surface of the flange 9 constituting the synthetic resin bobbin 7 at both upper and lower positions of the insertion hole 1o. 1'l[A tapered portion 12atlfl is formed. In addition, when assembling the bearing bodies 13ia and 13b, after inserting the bobbin 7 to the depths of the magnetic path pieces 2a and 2b in the stator core 1, the bearing bodies 13&, 13bi rotor 4 are assembled.
In this case, the rib-like protrusion 11? L
The dimensions of the rib-like protrusion 11& are set such that the tip end thereof and the bobbin side face portions of the bearing bodies 13a, 13b come into contact with each other, or even come into pressure contact with each other.

1 to 3a and 3b show another embodiment of the present invention, in which, contrary to the previous embodiment,
a bearing body 13a having a bearing portion 14 and a rib-like protrusion 11b;
13b side, -1: Rib-shaped projection 11b'l
'J Tapered part 12blll on the surface side of stator core 1
The other configurations are the same as those of the previous embodiment. In any of these configurations, either one of the magnetic path pieces 2a, 2b of the stator core 1,
Or, the bobbin 7 is inserted through both of the magnetic path pieces 21L, 2.
By assembling the bearing bodies 13&, 13bi which are in a loosely fitted state with
It is possible to eliminate play in the loose fit in the direction, that is, to suppress play in the bobbin 7 relative to the magnetic path pieces 2a, 2b.

Also, in any of the embodiments described above, the ridge-like projections 11a, 11bij and the tapered portions 12a.

12b, this taper 112a.

Due to the action of 12b, the bearing bodies 13a and 13b can be easily assembled.

Effects of the Invention As described above, according to the present invention, the bobbin inserted into the magnetic path piece in the stator core is connected to the outer circumferential surface of the flange of the bobbin,
The rib-shaped protrusion provided on either side of the bobbin side of the bearing body that supports the shaft of the rotor allows the rotor to be fixed without wobbling, which eliminates the drawbacks caused by bobbin wobbling and wobbling like in the past, i.e. It is possible to prevent problems such as abnormal noises caused by driving the electric motor, increased vibration from the electric motor to increase noise from equipment, and wear and tear on the bobbin and armature windings.

[Brief explanation of drawings]

Fig. 1 is a plan sectional view showing a conventional small-sized electric motor, Fig. 2 is a perspective view of a stator core, Fig. 3 is a perspective view showing a conventional bobbin, and Fig. 4 is a small-sized motor showing an embodiment of the present invention. A front view of the electric motor, a perspective view of the bobbin in FIG. 5, a plan view 2 and a front sectional view of the main part of the bobbin in FIG. 6, and FIG. 7 are other embodiments of the present invention. The perspective view of the bearing body shown in FIGS. 8A and 8L is a plan view of the main part and a front sectional view of the main part of the same bearing body. 1...-Stator core, 2a, 2b...Magnetic path piece, 3a, 3b...Magnetic pole part, 4...-
・Rotor, 6... Rotor shaft, 7...
Bobbin, 8... Armature winding, 9... Flange, 11a, 11b... Lip-shaped projection, 13! L,
13b...Bearing body. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 3 Figure 5 (0L) 11α- Figure 7 Figure 8 (a,)

Claims (1)

[Claims] A bobbin, in which an armature winding that excites the stator core is wound between a pair of flanges, is inserted into one or both of the parallel magnetic path pieces in the roughly U-shaped stator core, and the stator A recess is provided inside the ends of both parallel magnetic path pieces of the iron core to form a magnetic pole part, a rotor is disposed in the recess, and the outer circumferential surface of the flange of the bobbin and the shaft of the rotor are aligned. A thin lip-shaped protrusion is formed on either side of the bobbin side of the bearing body that supports the shaft.
A small electric motor in which the flange of the bobbin and the bearing body are brought into contact or pressure contact via the rib-like projections.