JPS6223239Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a brush holding device for a DC machine.

A conventional brush holding device for a relatively small DC machine such as a starter motor is shown in a front view and a sectional plan view in FIGS. 1 and 2. Reference numeral 1 denotes an annular mounting plate, in which holes 1a corresponding to the number of poles are drilled at equal pitches in the circumferential direction, and is mounted to a bracket (not shown) of a DC machine. Reference numeral 2 denotes a plurality of insulating support plates which are caulked and fixed by the respective caulking projections 1b of the mounting plate 1, and are applied to the respective punched holes 1a. Reference numeral 3 denotes a plurality of insulatingly supported holding frames which are caulked and fixed to the insulating support plate 2 by caulking protrusions 3a, and a spring notch 3b and a lead wire notch are provided on both sides of the box portion 5 from above, respectively. A notch 3c is provided. This holding frame 3
A spring hook 3d is formed at the end of the brush spring 4, into which a brush spring 4 made of a spiral spring is fitted. A brush 6 is fitted into a box part 5 surrounded by three sides of the holding frame 3 and an insulating support plate 2, and the top part is pressed by a brush spring 4. 8 is a commutator provided in the armature.

When the brush 6 becomes worn in the above-mentioned device, the presser arm side of the brush spring 4 goes down, but it is released without any trouble by the notch 3b of the holding frame 3. The lead wire 7 of the brush 6 extends in the circumferential direction, and as the brush 6 wears out, the position of the lead wire 7 drops, but it can escape without any trouble by the notch 3c.

In the conventional device described above, the lead wire 7 of the brush 6 extends in the circumferential direction, and if it is a positive pole, it is connected to the circuit on the stator side, and if it is a negative pole, it is grounded to the stator bracket, etc. Ru.

In conventional devices, the lead wires 7 of each brush 6 are directed in the circumferential direction, and when the number of poles is large, particularly in small machines, the gap between the retaining frame 3 of the adjacent pole becomes small, causing the brush springs 4 of the adjacent pole to come close to each other and hit each other, resulting in malfunctions.

This idea involves attaching a plurality of holding frames made of synthetic resin molded parts and each having a box part into which the brushes of each pole are inserted, to the sides of a disc-shaped mounting plate. The lead wire extending from the brush in the axial direction is passed through the gap formed by the gap provided in these divided sections, and the lead wire extending from the brush in the axial direction is inserted into the holding frame. On the other hand, a notch is formed to allow the brush spring that is placed in the circumferential direction and presses the top to escape, making it easy to pull out the lead wire and prevent it from hitting the brush spring.
Another object of the present invention is to provide a brush holding device for a DC machine whose holding frame can be mass-produced at low cost.

FIG. 3 is a front view of a brush holding device according to an embodiment of this invention, and FIG. 4 is an enlarged developed view as seen in direction A in FIG. 3. 11 is an annular mounting plate made of metal material such as a steel plate and formed by press working,
The protruding side 11 is located at the position of the grounding pole (minus side)
A is provided to form one end side of the box portion 18, and a mounting bolt is passed through the notch hole 11c to be attached to a fixed portion such as a bracket. 12 and 13 are spring hanging pins fixed to the mounting plate 11, and the spring hanging pin 12 at the pole position to be grounded is left exposed;
An insulating sleeve 14 is fitted to the other spring hook pins 13 at pole positions that are not grounded to insulate them from the ground. Reference numerals 15 and 16 denote a plurality of pairs of holding frames made of synthetic resin molded products, which are arranged alternately in the circumferential direction and fixed by caulking by caulking protrusions 11b provided on the mounting plate 11. .
The holding frame 15 is arranged at the position of the spring hanging pin 12, and one side forms one side and a half of the other end side of the box part 18 with the negative pole, and has a spring notch 15a.
is provided, and the other side is a box portion 19 with a positive pole.
It forms one half of one end side, the other side, and one half of the other end side. The holding frame 16 is a spring hook pin 13
The box 19 has a positive electrode on one side, and forms one half of one side and a half of the other end of the box 19, and is provided with a spring notch 16a, and the other side is a negative electrode. It forms one half of the other side and the other end side of the box portion 18. Reference numeral 20 designates a brush spring consisting of a spiral spring fitted to each spring hanging pin 13 via each spring hanging pin 12 and an insulating sleeve 14.

21 and 22 are negative side brushes and positive side brushes, and lead wires 23 and 24 are brought out in the axial direction, respectively. Lead wire 23 is grounded to the stator bracket, etc., and lead wire 24 is connected to the stator circuit. Connected. Each pair of holding frames 15,1
A gap is provided in the circumferential direction of the box portions 18 and 19 that form the divided portions of No. 6, and relief portions 25 and 26 are provided for the lead wires 23 and 24.
is formed.

In the device of the above embodiment, the holding frames 15, 16
It is made of a synthetic resin molded product and is mass-produced at an extremely low cost. In addition, even if the brushes 21 and 22 are worn down and the lead wires 23 and 24 are lowered, the relief portion 2
5 and 26, there is no problem, and the brushes 21 and 22 can be used until they become shorter than before, and their lifespan is extended. Further, the lead wires 23 and 24 of the brush are extended in the axial direction, and can be easily drawn out even if the distance between the adjacent pole holding frame is narrow, and this effect is particularly noticeable in the case of a small and multi-pole machine.

In the above embodiment, one end side of the box part 18 on the side that comes into contact with the ground is formed by the protruding side 11a of the mounting plate 11, but this protruding side may not be provided and it may be formed by both holding frames.

As described above, according to this invention, a plurality of holding frames made of a synthetic resin molded product and each having a box portion into which the brushes of each pole are inserted are attached to the side surface of a disc-shaped mounting plate, and these The holding frame is divided into the number of poles with the central part of the box part as a dividing part, and the lead wire extending from the brush in the axial direction is allowed to escape through the gap provided in this dividing part, and the lead wire extending from the brush in the axial direction is Since a notch is formed to allow the brush spring that presses the top of the brush disposed in the circumferential direction to escape, the lead wire can be easily pulled out and does not come into contact with the brush spring, especially in the case of a small and multi-pole machine. , holding frames can be mass-produced at low cost.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts of a conventional brush holding device, Fig. 2 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 3 is a front view of the main parts of a brush holding device according to an embodiment of the present invention. 4 is an enlarged development view of the device shown in FIG. 3, viewed in direction A. 11...Mounting plate, 11a...Protruding side, 15,1
6... Holding frame, 15a, 16a... Notch part,
18, 19...Box part, 20...Brush spring, 2
1, 22... Brush, 23, 24... Lead wire,
25, 26... Relief portions, and the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Consisting of a disc-shaped mounting plate attached to the stator part and a synthetic resin molded product, a box part is formed in which the brushes of each pole are attached, and The box part of each pole is divided into the number of poles using the central part as a dividing part, and the gap formed between these mutual dividing parts forms an escape part for the lead wire extending from the brush in the axial direction. and is provided with a radial notch portion disposed in the circumferential direction of the brush to allow a brush spring that presses the top portion to escape, and a plurality of holding frames attached to the side surface of the mounting plate. Brush holding device for DC machines. (2) The direct current according to claim 1 of the utility model registration claim, characterized in that the box portion of the brush that is grounded on the holding frame has one end side formed by a protruding side provided on the side surface of the mounting plate. Machine brush holding device.