WO1992016035A1

WO1992016035A1 - Roll commutator for electric motors and dynamos, and method of manufacturing it

Info

Publication number: WO1992016035A1
Application number: PCT/DE1992/000058
Authority: WO
Inventors: Ludwig Reisnecker; Martin Schwerdtle; Winfried Brettmann; Friedrich Behrens; Hans Deierling; Peter Franz; Siegfried Hauptmann; Claus Pollack; Stefan Ossenkopp
Original assignee: Robert Bosch Gmbh
Priority date: 1991-02-28
Filing date: 1992-01-31
Publication date: 1992-09-17
Also published as: DE59201981D1; EP0573439B1; DE4106307A1; EP0573439A1; JPH06505117A

Abstract

The roll commutator proposed has a number of adjacent lamellae manufactured from a continuous shaped-section metal bar. The roll commutator (39) is characterized in that, before the lamellae (31) are manufactured, the metal bar (1) has shoulders (9 and 11) on one side which act as retaining lugs (13, 15) after the series of sections produced from the metal bar (1) have been unrolled. Since it is unnecessary to machine the lugs when manufacturing the commutator, no additional tools or machining steps are necessary.

Description

Roll commutator for electrical machines and processes for its manufacture

State of the art

The invention relates to a roller commutator for electrical machines according to the type of the main claim, and to a method for its manufacture according to claim 5.

In a known roller commutator of the type mentioned here (DE-AS 12 18 053), the lamellae are produced from a metal profile by embossing grooves transversely to the longitudinal direction of the profile. For anchoring the material used for pressing the lamellae, anchoring claws are worked out from them by means of a peeling process and arise from the surface of the metal profile which later forms the inside of the commutator. A separate manufacturing process is therefore required in order to work the anchoring claws out of the metal profile. Advantages of the invention

The roller commutator according to the invention with the features mentioned in claim 1 has the advantage in comparison that it is easier and therefore cheaper to manufacture. There are no bending or peeling processes for working out the claws and thus machining steps in the manufacture of the rolling commutator. Furthermore, a tool group which makes additional maintenance work necessary can be omitted in the manufacture of the commutator.

An embodiment of the roller commutator in which the metal profile has an essentially L-shaped base body is particularly preferred. The longer arm of this base body has projections on its inner surface in the finished state of the commutator, which preferably have a V-shaped root region. The ends of these projections are directed outward in the opposite direction, essentially parallel to the longer arm of the base body. The metal profile thus has a simple cross section, which allows the metal profile to be produced inexpensively using the extrusion process.

Further configurations of the roller commutator result from the subclaims. It has proven to be particularly advantageous that the anchoring claws hold the insulating compound securely and also enable reinforcing rings to be introduced.

The L-shaped metal profile for the roller commutator according to claim 1 also enables a very simple ches and reliable manufacturing process with the features of .Claim 5.

drawing

An embodiment of the invention is explained in more detail below with reference to the drawing. Show it:

1 shows a metal profile used in the manufacture of a roller commutator in various processing stages;

Figure 2 is a sketchy plan view of an end face of a roller commutator;

3 shows a side view of a finished roller commutator in partial section and

Figure 4 shows an enlarged cross section through a single lamella of the roller commutator.

The individual processing steps in the manufacture of a rolling commutator from a metal profile 1 result from FIG.

The metal profile 1 has an essentially L-shaped base body 3, the shorter arm 5 of which is directed downward according to FIG. 1, while the longer arm 7 extends essentially horizontally. From the upper side of the longer arm two protrusions 9 and 11 project outward like wings, from which the anchoring claws 13 and 15 are made. To In a first processing step, which is referred to here as the first stage, with the aid of a first cutting tool 17, segments 19 are cut out of the projection 11 as waste which create the sufficient distance between the adjacent anchoring claws 15 for further processing.

The direction of movement of the metal profile 1 through a processing station for producing individual strand sections which are each formed into a rolling commutator is indicated by an arrow.

In the second stage of processing, with a second cutting tool 21, which is only indicated here and whose direction of movement is indicated by an arrow, corresponding segments 23 are cut out from the projection 9 for the spacing of the adjacent anchoring claws 13, which again incurred as waste.

In the third processing stage, a third cutting tool 25, which runs parallel to the longer arm 7 in the direction of the arrow, cuts out notches between the remaining anchoring claws 13 and 15, segments 27 occurring as waste.

In the next processing step, referred to as the fourth stage, counter-embossing suitable embossing tools 29a and 29b, which are only shown here in outline and whose direction of movement is indicated by arrows, which lie between the anchoring claws 13 and 15, are the areas of the base body 3 compressed, so that the anchoring claws 13 and 15 associated lamellae 31 are formed, which are interconnected by narrow webs 33. The webs run directly on the underside of the base body 3, which, as explained below, forms the outside of the later roller commutator.

Finally, in a further processing step identified as the fifth stage, the webs 33 are cut out in the area in which the shorter arms 5 open into the base body 3. For this purpose, a fourth cutting tool 35 is introduced approximately in the direction of the longitudinal extension of the shorter arms 5 or the arrow shown in the space between two lamellae 31, so that the webs 33 are cut out in the region of the shorter arms 5 and segments 37 occur as waste.

For the manufacture of the strand sections 38 required for a rolling commutator from the metal profile 1, it is possible to separate these strand sections from the metal profile 1 before the first stage or after the fifth stage. In FIG. 1 it is assumed that the separation of individual strand sections 38 took place before the first stage.

In a next processing step, the individual strand sections 38, shown in a very shortened form in FIG. 1, are bent into a circular ring after the 5th stage, so that the plan view of the slat ring 38a of a roller commutator 39, strongly outlined in FIG. 2, results. The individual strand sections indicated in FIG. cuts 38 of the metal profile 1 are bent so that the anchoring claws 13 and 15 come to lie on the inside of the circular cylindrical roller commutator and the underside of the slats 31 shown in FIG. 1 forms the outside thereof.

It is clear from FIG. 2 that the space 41 present between the shorter arms 5 is widened by the rolling of the slats 31 shown in FIG. 1, while the space 43 lying between the respectively adjacent anchoring claws 13 and 15 is narrowed.

In the roller commutator 39 indicated in FIG. 2, reinforcement rings 45 and 47 can then be inserted at the end, the diameter of which is selected so that they come to lie between the anchoring claws 13 and 15 and the base body 3 of the metal profile 1. A bushing 49 can be inserted into the interior of the roller commutator with an insulating spacing, which serves as the seat of the finished roller commutator 39 on the shaft of an electrical machine.

As can be seen from the cross section of the commutator 39 shown in FIG. 3, in a next processing step the parts mentioned, the roller commutator 39, the reinforcing rings 45 and 47 and the bushing 49 are pressed together with plastic 51. In order to give the bushing 49 a better hold, it can be provided on the outside with projections and depressions. In a further operation, the rolling commutator is turned or ground on its outside, the connecting webs 33 being removed between the individual slats 31. The individual slats 31 are then held together only by the reinforcement rings 45 and 47 and by the plastic aces 51. It should be noted that the anchoring claws 13 and 15 give the slats in the plastic 51 a secure hold. Slats 31 and socket 49 are also insulated from one another by the plastic 51.

From the above it is clear that the manufacture of the rolling commutator is relatively simple. In particular, no separate processing steps are required for the formation of the anchoring claws 13 and 15, which is particularly clear from FIG. It is essential that the anchoring claws have their final shape after the segments 19 and 23 have been cut out in the first and second stages of the machining process. Another bending or peeling process, as indicated above in connection with the prior art, is not necessary here.

The enlarged sectional view shown in FIG. 4 through a lamella 31 along its central plane shows the base body 3 with the longer arm 7 and with the shorter arm 5 running approximately 90 'to this.

The anchoring claws 15 and 13 arise on the side of the longer arm 7 opposite the shorter arm 5. It can be seen that they each have a practically V-shaped root region 53 and 55 in the form of projections in their original region near the base body 3 to which the ends 57 and 59 of the anchoring claws, which run in the opposite direction outward and parallel to the longer arm 7, are connected. The length of the ends 57 and 59 is selected so that they span practically the entire remaining length of the longer arm 7, as seen from the root region 53 and 55, respectively. In this way, an intermediate space 61 or 63 is created between the base body 3 or its longer arm 7 and the ends 57 and 59 of the anchoring claws 13 and 15, each of which accommodates a locking ring (see reference number 45 and 47 in FIG. 3) can serve. In any case, when the rolling commutator 39 is pressed, plastic mass gets into this space 61 or 63, which is then held securely by the ends 57 and 59 of the anchoring claws 13 and 15, which is also evident from the partial sectional view according to FIG. 3 ¬ Lich results.

The ends 57 and 59 are thinner than their associated root regions 53 and 55 or the base body 3. This makes the rolling commutator relatively light, while at the same time secure anchoring of the slats in the associated plastic mass 51 is ensured.

It follows from all of this that the anchoring claws 13 and 15 can also be arranged in the opposite direction, the root regions 53 or 57 not diverging from the inside to the outside but being directed towards one another. In addition, the ends of the anchoring claws are then directed towards one another. With such an arrangement of the anchoring claws, the possibility of introducing reinforcement rings is eliminated, but this is not a disadvantage in the case of lighter designs. In such a configuration of the anchoring claws, the projections 9 and 11 of the metal profile 1 are designed accordingly.

Claims

Expectations

1. Rolling commutator for electrical machines, with a number of rings arranged next to one another, which can be produced from a continuous metal profile, characterized in that the metal profile (1) has protrusions (9, 11) on one side even before the production of the segments (31) ) which, after rolling up the machined metal profile, serve as anchoring claws (13, 15).

2. Rolling commutator according to claim 1, characterized ge indicates that the metal profile (1) has a substantially L-shaped base body (3), and that the projections (9, 11) have a preferably V-shaped root region (53, 55) ), and that their ends (57, 59) extend essentially parallel to the longer arm (7) of the base body (3).

3. Rolling commutator according to claim 1 or 2, characterized in that the ends (57, 59) protrude outwards in opposite directions.

4. Rolling commutator according to one of claims 1 to 3, characterized in that the approaches (57,59) are thinner than the root area (53,55) of the anchoring claws (13,15) and / or the other areas of the Basic body (3).

5. A method for producing a roller commutator according to claim 1, characterized in that

a) the anchoring claws (13, 15) are first cleared from the projections (9, 11) by cutting out segments (19, 23),

b) the fins (31) are then pre-shaped by cutting out further segments (27) in the longitudinal direction between the fins (31) from the longer arm (7) of the metal profile (1),

c) the lamellae (31) are then separated from one another by opposing embossing tools (29a, 29b) except for narrow webs (33) lying on the outside of the lamellae,

d) the webs (33) in the region of the shorter arms (5) of the metal profile (1) are then removed by a cutting tool (35) and

e) finally, the lamellae (31) are rolled into a lamellar ring in a strand section (38) separated from the metal profile (1), pressed with plastic, anchored therein and isolated from one another by removing the webs (33).