JPS5943804Y2 - Brush holding device for flat DC rotating electrical machines - Google Patents

Description

[Detailed Description of the Invention] (Field of Application) The present invention relates to a brush holding device that is inserted into a mounting hole provided on the side surface of a bracket and attached in the axial direction in a flat DC rotating electric machine.

(Prior art) In a conventional flat type DC rotating electrical machine, the brush holding device for storing the brushes is individually attached to the mounting hole of the bracket, and this is attached to the first part along with the structure of the rotating electrical machine main body.
The diagram will be explained.

In FIG. 1, numeral 1 is an armature having rotor windings formed by printed wiring on both sides, and numeral 2 is a rotor knob to which the armature 1 is fixed, which is fitted and fixed to a rotating shaft 3.

4.5 is a bearing that supports the rotating shaft 3, and 6 and 1 are bearings 7.
・Usings, 8 and 9 are inner peripheral surfaces of the bearing housing, 10.
Reference numeral 11 denotes a bracket provided with the bearing housing, and permanent magnet fields 12 and 13 are fixed inside each bracket,
The armature 1 is disposed within the opposing gap between the permanent magnet fields 12 and 13.

14 and 15 are bearing covers attached to the outside of the brackets 10 and 11, and 16 are brush holder mounting holes provided in the bracket 11, which are provided in the same number as the number of brushes.

Reference numeral 17 denotes a brush holder, which is provided with a brush case 18 inside, inserted into the brush holder attachment hole 16, and fixed with adhesive.

A brush 19 is housed in the brush case 18 so as to be slidable in the axial direction, and is pressed against the armature 1 by a presser spring 20, and supplies power to the rotor windings from a lead wire 21.

Such a conventional brush holding device for a flat DC rotating electrical machine has the following drawbacks.

1. A plurality of (for example, two or four) brush holders 11 are each constructed as a single unit, and each brush holder is inserted into the brush holder mounting hole 16 of the bracket and attached separately. The mounting strength is weak, it is troublesome to install, and the stability is poor when it is fixed, which can cause the brush to fall, shift, or wobble.

2. Brush holder mounting hole 16 provided in bracket 11
The brush holder 11 is fitted and fixed to the brackets 11 and 12 after press molding.
In order to cut the inner circumferential surfaces 8 and 9 of the bearing/ housing for bearing fitting, the hole 16 is cut from the actual rotation center (center of the rotation axis).
This causes an error in the center dimension of the brush holder, and therefore it is necessary to make the brush holder mounting hole 16 thicker and adjust the brush holder mounting position, which inevitably deteriorates the positioning accuracy of the brush in the radial and circumferential directions. It has a negative effect on the characteristics of the rotating electric machine, and requires a special jig for installation.

(Purpose of the invention) The object of the present invention is to provide a brush holding device which eliminates the above-mentioned drawbacks, allows the brush to be reliably attached to the correct position of the bracket, and facilitates the installation work.

(Embodiment) In the embodiment shown in FIG. 2, a brush holder 22 has a plurality of brush cases 24 protruding from a holder substrate 23, and is integrally molded with synthetic resin.

Reference numeral 25 denotes an engaging portion provided on the inner surface of the holder base plate 23, which forms a dowel that fits into a part of the outer periphery of the bearing 5 on the anti-load side.

Note that the same parts as in FIG. 1 are given the same reference numerals, so the explanation of these parts will be omitted.

Therefore, each brush case 24 has a bracket 11
A plurality of brush cases 24 are integrally molded with the holder base plate 23 and inserted into the brush holder mounting hole 16 of the bracket 11, and the engaging portion 25 of the holder base plate 23 is fitted to the bearing 5, and the bracket 11 with adhesive or the like.

(External force embodiment) In the above-mentioned embodiment, the engagement portion 25 provided inside the brush holder 22 is formed of ferrule and is fitted onto the outer circumferential surface of the bearing 5. As shown in FIG. 2, the inner peripheral surface 9 of the bearing housing 7 may be formed with an annular protrusion that fits together with the bearing 5.

Moreover, the brush holder 22 of the present invention includes an engaging part 25 that fits into the bearing 5 or the bearing housing 7, and a holder base plate 23 having a brush case 24 on the outside thereof, and is attached to the outer surface of the bracket 11. The outer diameter of the brush holder 22 is larger than the bearing or housing part, and when a detector 27 such as a speed detection generator is installed on the outer surface of a rotating electric machine, the outer frame of the detector is fitted to the outer circumferential surface of the brush holder 22. You can make it so that you can take care of it.

In this case, not only is there no need for the pinhole conventionally provided on the bracket for attaching the detector, but the brush holder 22 is attached to the bracket 11 with reference to the outer circumferential surface of the bearing 5 or the inner circumferential surface 9 of the bearing housing. Therefore, the outer periphery of the brush holder 22 is accurately concentric with the rotating shaft 3, and the axis of the detector 2T can be accurately aligned with the axis of the rotating electric machine.

Incidentally, as shown in FIG. 5, a mounting seat 28 may be provided on the outer surface of the brush holder 22, and the detector 27 may be fitted onto the inner or outer peripheral surface of this mounting seat.

(Effects of the invention) As described above, the present invention is a brush holding device for a flat type DC rotating electrical machine that has a brush case that is attached by being inserted in the axial direction into a holder mounting hole provided in a bracket. A brush holder is provided in which a plurality of brush cases are integrally molded from synthetic resin, and the holder substrate is provided with an engaging portion that fits into the outer surface of the bearing of the rotating shaft or the inner peripheral surface of the bearing housing of the bracket. There is no need to attach each brush case separately, and not only can the brush cases be held stronger, but also the mutual radial and circumferential positioning of the brush cases can be maintained accurately and extremely easily. This allows the brush to be installed stably without falling or shifting.

Furthermore, since the engaging portion 25 provided on the inner surface of the holder base plate is fitted to the inner circumferential surface 9 of the bearing 5 or the bearing housing 7, the brush holder 22 can be mounted exactly on the same axis as the rotating shaft. Even if the holder mounting hole 16 of the bracket 11 is large, the brush position can be maintained at an appropriate position from the center of the rotation axis, and the brush positioning accuracy can be extremely high without the need for special jigs. can.

Note that the holder board 23 allows the bearing cover to be omitted, and the brush case can also be used as a mounting seat for a detector attached to the rotating electrical machine, so the assembly man-hours for the rotating electrical machine as a whole can be reduced, and effects such as suspension can be achieved. be.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the upper half of a conventional brush holding device of a flat type DC rotating electric machine, Fig. 2 is a side sectional view showing an embodiment of the present invention, Figs. 3, 4, and 5. FIG. 2 is a side cross-sectional view of the upper half of another embodiment of the present invention. 1 is an armature, 3 is a rotating shaft, 4 and 5 are bearings, 6°T is a bearing housing, 8 and 9 are inner peripheral surfaces of the bearing housing, 10.
11 is a bracket, 12.13 is a permanent magnet field, 14,
15 is a bearing cover, 16 is a holder mounting hole, 19 is a brush, 2o is a presser spring, 22 is a brush holder, 23 is a holder board, 24 is a brush case, 25 is an engaging part, 2
6 is an outer cylinder of the brush holder, 2γ is a detector, and 28 is a mounting seat.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ In a flat DC rotating electric machine having a brush case that is installed by inserting it in the axial direction into the holder mounting hole on the side of the bracket, the holder board and the plurality of brush cases protruding from the holder board. A flat type direct current, comprising: a brush holder integrally molded with a synthetic resin, and an engaging portion that fits into the outer peripheral surface of the bearing of the rotating shaft or the inner peripheral surface of the bearing housing of the bracket is provided on the holder substrate. Brush holding device for rotating electric machines. 2. The brush holding device for a flat DC rotating electric machine according to claim 1, wherein the engaging portion is a dowel that fits into the outer peripheral surface of the bearing. 3. The brush holding device for a flat DC rotating electric machine according to claim 1, wherein the engaging portion is an annular protrusion that fits into the inner circumferential surface of the bearing housing.