DE1951503A1 - Brush device for dynamo-electric machines - Google Patents

Description

Joseph Lucas (Industries) Ltd. Io. October 1969 Great King Street
Birmingham / England

Brush device
for dynamo-electric machines

The invention relates to a sieve device for a dynamo-electric machine.

A brush device according to the invention is characterized through a bearing plate with an opening and two slots that extend outward from the opening, one in the respective slot slidably seated brush, whereby the individual brushes are electrically isolated from each other, from spring means carried by the plate, which bias the brushes in sight of the breakthrough, and brush holding means for preventing pulling the brushes out of the slots underneath the feedback of the spring center ..

The invention is based on an · exemplary embodiment · with reference explained in more detail on the drawings. In the drawings

T 009817/0467. ₂ _

OHtGWAL

genes are »

1 shows a plan view of a brush device for a dynamo-electric machine,

Fig. 2 is a view of the brush device shown in Fig. 1 in the direction of arrow A and

3 shows a position similar to FIG. 1, with

however, the brushes and associated springs and connections are omitted.

The brush device has a bearing plate 11 from a flat piece of insulating material. The plate 11 has a round opening 12 and the opening 12 three slots 13, 14 and 15 extend radially outward, (whereby the slots 13 and 15 are diametrically opposite each other, while the slot 14 is at an angle to the slot 13. The plate 11 is shaped to fit in a dynamo-electric machine, with the collector of the dynamo-electric machine extends through the opening 12. The Surohmesser of the opening 12 is larger than the diameter of the collector. she Plate 11 has a number of holes by means of which the door direction is connected to the housing of the dynamo-electric machine that will.

At their closed ends, the slots 13t 14 »15 ▼ are larger te areas 13 a, 14 a, 15 a, and the closed end of the respective slot has a projection 13b, 14b or 15b on. The sides of the projections 13b, 14b, 15b are undercut, namely in connection with the end of the respective slot, so that they have their greatest width m between their ends.

The brush device also has three carbon brushes 16, 17 and 18, each in the shape of a substantially rectangular

009817/0467

SAO QPtIQlHAL

Carbon blocks are provided. They each have two brushes parallel grooves on opposite sides, and the brushes 16, if, 18 sit in sliding position in the carriage 13, 14, 15, with the sides of the slots 13, 14, 15 in the grooves engage in the brushes to prevent the brushes from moving transversely in relation to the plate .11. On brushes 16, 17, 18 each steel girders 19, 21, 22 are in contact, which act on the ends of the brushes which are removed from the opening 12 lie. The carriers 19, 21, 22 each have integrally formed strips 23, 24, 25 which are parallel to the corresponding Slots 13, 14, 15 extend and which are bent back at their free ends to hooks 23a, 24a and 25a, respectively bil & en. They strips, 23, 24, 25 are each made of compression springs 26, 27, 28, which sit between the closed ends of the slots 13, 14t 15 and the supports 19, 21, 22 and the Pre-tension brushes 16, 17, 18 in the direction of opening 12. The ends of the springs 26, 27, 28, which are remote from the brushes 16, 17, 18, grip the gate jumps 13b, 14b, 15b, the width of the larger rope being the protrusions 13b, 14b, 15b larger than the diameter of the end turns of the Springs 26, 27, 28 is. When the springs attack the cracks in the gate, they are held in place by these gates. They hook 23a, 24 », 25a at the ends of the strips 23, 24, 25 attack the end turns of the respective springs, and this ensures that the burets 16, 17, 18 in the longitudinal direction their respective sole slots are not moved so much that the brushes are disengaged from the slots Electrical connections to the brushes are made via the associated strips 23, 24, 25, the Hooks 23a, 24a, 25a are connected to respective power supply lines by rolling in (not shown).

009117/0467

The brush device according to the invention is ztr use provided in a two-speed motor for a windshield wiper. For this reason there is one more brush than the two, required for a single speed engine. The surface of the brush 17 that engages the collector of the armature, has a shorter circumferential length than the corresponding surfaces of the brushes 16,18.

Claims ι

009817/0467

Claims (8)

Claims ί 1Jbrush device for a dynamo-electric machine, marked through a bearing plate (11) with a Duechbruoh (12) and two slots (13, 15) »which extend from the opening (12) extending outwardly, a brush (i6, 18) slidably seated in the respective slot (15 »15), the individual Brushes (16, 18) are electrically insulated from one another, celebration means (26, 28) carried by the plate, which the brushes (16, 18) pretension in the direction of the opening (12), and brush holding means (23a, 25a) to prevent disengagement the brushes (16, 18) from the slots (I3, 15) under the bias the spring means (26,28). 2. Brush device according to claim 1, characterized in that the brushes (i6,18) each with a groove in two opposite one another Pages are provided and that the sides of the respective slot (13, 15) in the bearing plate (11) engage in the grooves, that the brushes (16, 18) are each slidably mounted in the slot (13, 15). 3. Brush device according to. Claim 1 or 2, characterized in that that the spring means (26, 28) are each a compression spring which is each assigned to a brush (16, 18), the pressure spring (26, 28) is attached at one end to the bearing plate (11). 4 * brush device according to claim 3 »characterized in that the brush holding means (23, 25) of the respective brush (16, 18) 416
Vase 009817/0467 8AD OBtGtNAi. -Z- duroh a web are formed, which at one end with the brush (16, 18) is connected and at its other end to the respective The end of the compression spring (26, 28) can be brought into contact, which is located away from the brush (16, 18). 5 »brush device according to claim 4, characterized in that the web is conductive and forms part of the electrical connection to the associated brush (16, 18). 6. Brush device according to one of claims 1-5 »characterized in that that the bearing plate (11) is formed from an insulating material. 7 «Brush arrangement according to one of claims 1-6, characterized in that that the slots (13 * 15) are diametrically opposed to each other are opposite and that the plate (11) is provided with a third slot (14) in which a third brush (I7) slidably seated. 8. Bürstenvorriehtung according to claim 7 »characterized in that that the surface of the third brush (17), which rests against the surface of the collector of the machine with which the Brush device is used, a smaller peripheral length than the corresponding surfaces of the other brushes (16, 18) has. 009817/0467 Blank page