JPS5914341A - Brush for small size motor - Google Patents

Abstract

PURPOSE:To enable to fix a brush in a flat state by forming a notch on the bent part of a mounting plate and fixing the brush at the position formed of the notch. CONSTITUTION:A notch 27 is formed on the bent part of a mounting plate, a brush fixing part 24 is provided at the open end of the mounting plate out of the range perpendicular to the bending line of the mounting plate, and a brush 22 and a buffer 23 are bonded to the brush fixing part 24. Then, it can be machined in the flat state, and can be readily bent without influence of deformation or the like to the brush and the buffer.

Description

[Detailed description of the invention] The present invention relates to brushes for small motors.

Recently, the market demand for small motors is VTR or VTR.
As seen in cameras and micro cassettes, as motors become smaller and lighter, motors are becoming smaller, thinner, and more efficient, and compact flat coreless motors are emerging. However, small motors such as those found in small flat coreless motors have a complicated component structure, making automation difficult and costly. In particular, the brush part is a thick element that increases the cost by 20%. Figures 1 and 2 show the conventional brush structure, (') 1 (1) is a brush;
The brush has a contact portion and is made of a metal plate having spring characteristics. (2) is the mounting plate, which is made of metal and has a bent part (
2a)? A brush is fixed to (2a), and a part of it protrudes outside the motor, and becomes the input terminal (2b). Note that the input terminal (2b) ?(2b) is the positive side,
The negative side is placed in the specified position.

Brush (1) again? (A cushioning material (3) is glued to the back of the chair to dampen vibrations.

However, the conventional brush structure has a bending part (2a) of the mounting plate QO (2a) and a brush fixing part (1a).
, (la) and the cushioning material (3) are adjacent to each other, so automation is difficult and the fixing of the brush (1) and the adhesion of the cushioning material (3) must be done manually, which reduces productivity. It has drawbacks such as high cost and high cost.

This was done in view of the points mentioned in this @HAFT article, and by adopting the entire structure described below, all of the above-mentioned drawbacks have been eliminated.

First, the structure of a small flat coreless motor will be explained using the cross-section IUT + side view of Fig. (5), three notches (6) (others not shown) on the outer periphery, and a recessed step (7) on the tip. A bearing (8) with a hole in the center is fitted into a hole (5) provided in the center of the bottom of the case. (9) Shows a beamer, and the beamer is a shaft α supported by the bearing (8).
OKMultiple coils α...and a ring-shaped electrode plate)
and a magnetic plate) are integrally fixed by synthetic resin u4. The electrode plate αaK is a commutator (1υ) having a hole that fits into the outer diameter of the shaft αQ and is fixed with solder (15a).

The notch (6) provided in the case (4) has an outer diameter of 3
A substantially circular support member OQ having convex portions (16a) (others not shown) is fitted therein, and is provided at the tip of the case (4) via a square/g-shaped elastic body a''. It is held by the cover 00 which is fitted and fixed in the recessed part (7). Note that (x6b) is a permanent magnet fixed to the supporting member (IQ). Fig. 4 shows the details of the parts fixed to the cover Qθ. FIG.

In the figure, G0 is an insulating sheet that holds the free end of the shaft a9, and the cover (Q) is a plastic rivet that measures the electrical insulation between l and the mounting plate 00.
Fix the insulation sheath H9 and the mounting plate 4 to the cover α0. Fifth
The following figures show the brush structure of the present invention in detail, and FIG.
Mounting plate 120, brush G2a, cushioning material? : The brush parts consisting of 3 are arranged in a specified mounting state as a pair of positive and negative sides, and the mounting plate QO has a brush fixing part Q4, an input terminal VAu exposed to the outside of the motor, and a bent part Q.
has.

Next, the manufacturing process of the brush structure will be explained. First, as shown in Figure 6, attach the metal plate to the positive and negative side mounting plates (2Q, IjOk, and its input terminal part Q-9').
At the tip of t cl, O, punch out the connecting piece (1213) into an integrated state. By this punching, the main body, the input terminal part, the shoe, the brush fixed part ff1K4. (2 Yu and the brush fixed part e →, Q A notch 31 is formed below the brush.Next, as shown in the figure, the brush fixing part G4,
Placilene and Qa are fully installed on ea4. At this time, one brush is placed above the brush fixing part e4, and the other brush is placed above the brush fixing part 8.
(G2 is positioned below 5ω→ and the brush is notched)
1. (It is fixed to the part separated by 21. Then, the brush HKt is fixed to the part separated by the brush fixing part c24, lj4 from the surface opposite to the surface on which the brush is fixed. Therefore, the cushioning material 93, 91-adhesion is applied. [See Figure 7]. Then,
Fold the part indicated by the dashed-dotted line in the figure [see Figure 8].

Finally, cut 0 into the connecting piece from the dashed line in Figure 8 to complete the process. In this way, a notch 31 is provided in the bending part Q0 of the mounting plate, a brush fixing part is provided at the open end outside the range perpendicular to the bending line of the mounting plate, and the brush ea and the cushioning material? 3
By bonding, it is possible to process the flat plate, and it is also possible to process the plus side and minus 1111 k in an integrated state, and furthermore, it is possible to avoid the effects of deformation etc. on the blank a and the cushioning material 3. The brush structure can be easily bent without adding any additional material and is suitable for automation at a low cost.

As described above, in the present invention, a notch @ G21' is provided in the bent part e0 of the mounting plate Q, and the brush Qa is completely fixed in the brush fixing part Q4 formed by the notch. The brush can be fixed in the state of 1, and has the advantage of providing an inexpensive brush structure suitable for automation.

[Brief explanation of drawings]

1 and 2 show a conventional brush, with FIG. 1 being a plan view and FIG. 2 being a side view. 3 to 8 show embodiments of the present invention, with FIG. 3 being a sectional side view of a small motor, and FIG. 4 being a perspective view of a portion of the cover. FIG. 5(a) is a plan view showing the mounting plate QQ, brush ea, etc., FIG. 5(b) is a side view of the same, and FIGS. 6 to 8 are plan views showing manufacturing steps. Installation diagram Q? Brush Gu1 Cushioning material Q4 Brush fixed part QO bent part) Notch Patent applicant
Al7” Electric Co., Ltd. No. 511 (a) No. 5127 (b)

Claims (1)

[Claims] In a brush for a small motor in which a part of the metal brush is bent at right angles and a metal brush with spring characteristics is fixed to the bent part, there is a notch in the bent part of the mounting plate. A brush for a small motor, characterized in that a brush metal is fixed to a brush fixing part formed by a notch.