Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-11-18
1994-05-03
Voeltz, Emanuel T.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 89, 310 40MM, H02K 1100, H02K 500
Patent
active
053090535
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electric motor, especially to an electric small-power motor for driving windshield wipers of motor vehicles and more particularly relates to a method of manufacturing such an electric motor.
An electric motor of this type is disclosed in German patent document DE-OS 38 38 285 discloses an electric motor in which a gear pot is closed by a metal cover having an outside and an inside. A plastic component is injection-molded on the cover into which plastic component a conductive strip punched from a metal blank is embedded. In the cover, there is an aperture which is completely closed and an aperture which is open at the edge. The conductive strip runs from the outside of the cover to the inside through these apertures. The plastic component engages the cover at the inside through another aperture.
SUMMARY OF THE INVENTION
The object of the present invention is an electric motor in which the conductive strip can be held at a safe distance from the cover during the injection molding process. An additional object is the method of manufacturing such an electric motor.
This first object is achieved, according to the invention with respect to an electric motor having a cover with an aperture in the cover and a plastic component. The plastic component has at least one recess which is open towards the inside of the cover and which extends up to a conductive strip. The recess is formed by supporting the conductive strip through the aperture in the cover by means of a holding device during the injection molding process of the plastic component. By this support, a safe distance from the cover and thus a safe electric insulation of the conductive strip with respect to the cover is ensured.
The invention also includes a method of manufacturing an electric motor, which on the one hand ensures a safe distance between the conductive strip and the cover and on the other hand ensures that the conductive strips are separated from possible sections of blade terminals by being totally covered by plastic at the outside of the cover. This method differs from that described in the German patent document DE-OS 38 38 285 in that the conductive strip is supported by a holding device of the injection mold during the injection molding process. This holding device extends from the inside of the cover through an aperture of the cover up to the conductive strip.
If there are several conductive strips, they are first punched out of a metal blank, still being connected to each other, via one or several connecting webs, then they are inserted into the injection mold, also still being connected to each other. In the injection mold, they are separated by one or more separating dies, preferably without waste, and subsequently injection-molded by plastic, whereby during the injection-molding process a separating die serves as a holding device. The separating die cuts off the connecting webs from the inside of the cover through the aperture in the cover.
While cutting off the connecting webs, the conductive strips must be supported by at least one holding device on the side opposite the separating web in the area of the connecting webs. Advantageously, at least the one holding device is moved back from the conductive strips during the injection molding process. Thus, it is achieved in a simple manner that the conductive strips are not bare at the outside of the cover.
An embodiment according to the invention of an electric motor as well as an injection mold are illustrated in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of an electric motor assembly according to the invention in a direction perpendicular to the cover of the gear pot or housing.
FIG. 2 in part is the longitudinal section of the electric motor of FIG. 1, and in part is the view of the gear pot or housing when the cover has been taken off.
FIG. 3 is a plan view of the inside of the cover of FIG. 1.
FIG. 4 is a plan view of the cover of FIGS. 1 and 3 without conductive strips and plastic component.
REFERENCES:
patent: 4792307 (1988-12-01), Stewart, Sr.
patent: 4845396 (1989-07-01), Huber
patent: 5063317 (1991-11-01), Bruhn
SWF Auto-Electric GmbH
To Ed
Voeltz Emanuel T.
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