DE7609317U1 - Brush holder system for small electric motors - Google Patents

Description

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VDO 6 Frankfurt / Main

Adolf Schindling AG Graefstr. 1 o3

Brush holder system for small electric motors

I The innovation relates to a brush holder system for elec-

I tric small motors with two carbon brushes, each on one

I seated leaf spring serving as a power supply, each of which

I on a connection element fixed in a bearing shield

i is solidified.

I In known brush holder systems of this type are the

I the leaf springs carrying the carbon brushes to those in the end shield

i welded connection elements. Especially with thin ones

Ü Leaf springs, which are used in small engines, bring a

I such a connection between the leaf spring and the connecting element

i have significant manufacturing problems. In addition, is a

I required a relatively large amount of tools. Both work

■ adversely affects product costs.

I In other known brush holder systems are leaf springs and

jj connecting elements to one another by means of one or two rivets

ί connected. For such an attachment, however, additional

ι fasteners required and there is also a comparison less favorable than the previously described form of attachment Assembly process. Both of these increase the product costs considerably.

These disadvantages and difficulties should be overcome by the innovation. It is therefore an object of the innovation to create a brush holder i system, in which the attachment of the coal

■ bristle-carrying leaf springs can be carried out at the connecting elements without at the 'additional means in a simple manner.

In particular, the fastening should result in the lowest possible costs.

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This object is achieved according to the invention in that each
Leaf spring on its bearing surface assigned to the connection element has at least one opening and each connection element of the
or tabs assigned to the openings and protruding through them
has, which are plastically deformed at least at their free end to connect the leaf spring 'and connecting element.

Since the protruding from the support surface of the connection element
Tabs can be produced in the same operation in which the connecting element itself is manufactured and all that is required to connect the leaf spring and connecting element is plastic deformation of each free tab end, which can also be carried out for all tab ends in a single operation, the result is an extremely simple, inexpensive fastening of the leaf spring and connection element that does not require any additional means.

In a preferred embodiment, the flap ends are deformed in their longitudinal direction by being spread open. This so-called caulking has compared to, for example, an entanglement of the
Free flap ends have the advantage that the two parts are almost tension-free and a good electrical one
Contact is made between the two parts. The latter can be further improved in that each leaf spring has two openings which are arranged at a distance from one another and through each of which a tab protrudes.

The innovation is based on the drawing, which is partly schematic Representation contains an embodiment, explained in more detail. Show it

Figure 1 is a plan view of the connecting element with attached leaf spring,

Figure 2 is a side view of the connecting element with leaf spring according to Figure 1 and

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Figure 3 shows a section through the connecting element

Leaf spring according to Figure 1 along öer line III-III.

The brush holder system, of which only one half is shown, comprises a carbon brush 1, which in a Power supply line serving leaf spring 2 sits, and a connecting element 3, which is in a plastic bearing plate, not shown 4 is attached.

The connecting element 3 has two punched and bent tabs 5 and 6, which pass through two appropriately sized openings 7 and /. 8 protrude in the leaf spring 2. The free ends of the Tabs 5 and 6 are plastically deformed by a caulking process in such a way that each lobe end extends in the longitudinal direction enlarged and splits transversely to the longitudinal direction. In this way, leaf springs ■ 2 and connecting element 3 are safe. and connected to one another with a low contact resistance.

Claims (2)

I ti Ι »Ι · I I · ι ti Il · ■ I Il I · · · I I I III I> 1 1 I III · I I J 11 Il · Il Protection claims . Brush holder system for small electric motors with two carbon brushes, each on one as a power supply line
serving leaf spring, each of which is attached to an in
A connection element fixed to a bearing plate is attached, characterized in that each leaf spring (2) is assigned at least one opening (7, 8) and each connection element (3) is assigned to the opening or openings (7, 8) on its bearing surface assigned to the connection element (3) and through die.se has protruding tabs (5, 6) that at least have its free end to connect the leaf spring (2) and
Connection element (3) are plastically deformed. 2. Brush holder system according to claim 1, characterized in that the flap ends are deformed in their longitudinal direction by spreading them apart. 3, brush holder system according to claim 1 or 2, characterized in that each Blattfder (2) has two spaced apart openings (7, 8), through each of which a tab (5, 6) protrudes.