DE6947050U - PERMANENT MAGNETIC ROTOR. - Google Patents

Description

Se hr.no. Gbm 111 ! 3 "./ Am.

Fines DIEEL, 85 Nuremberg, Strjtanstra0e 49

Permanent diagnostic rotor

The innovation relates to a permanent rotor for ElektroKotore with an injected plastic part soft: achbial to the axis of rotation of the rotor a plastic slot, and, if necessary, cams for a backstop are injection-molded from plastic.

It is already known to inject plastic 1 into permanent magnet rotors for small electric motors, such as synchronous motors _9; the plastic part is made of an injected brass part.

Eb is also already known that the pinion is made in one piece. r '". nststofftcil z-ä spray. The axis of the rotor is in the Xum £ ± atoi! part firmly with incoming pritE «,.

Jurch the innovation a permanent magnetic Iotor ¹ will now be given, Lei which forms the plastic cord at the same time provided with small tolerances bearing for the axis of rotation of the rotor. This results in a cheaper production compared to the first-mentioned known embodiment. The plastic pinion for the output is injection-molded in one piece with the plastic part and forms part of this bearing.

6947U5Ö

t HtI

A particularly useful further development of the innovation provides that the plastic part is provided with such recesses and grooves that its wall thickness is approximately the same everywhere.

In the following, the innovation will be explained in more detail with reference to the drawing using an exemplary embodiment. Show it:

FIG. 1 is a view of the rotor on a greatly enlarged scale from FIG front;

FIG. 2 shows a section along the line 11-0 through the rotor according to FIG. 1

1 designates a permanent magnetic rotor made from a sintered material such as barium ferrite. A plastic part 2 is injected into this, the axial bore £ a of which simultaneously represents the bearing of the entire rotor. In the manufacture of this bearing, tolerances of 0.02 mm are observed. Integral with the plastic part 2 is a pinion 3 is connectedness \ the serving for the output from the rotor. A circular ring k. of art ^! Fabric part 2 contains two cams 5 $ which are used for a backstop. The plastic part 2 also contains grooves 6 and 6a or recesses 7 such that the wall thickness of the part is approximately the same at all points. As a result, the precise tolerance production of the bore 2a is particularly favored.

The innovation has the advantage over the previously known permanent magnet rotors that the plastic part itself is the bearing represents for the axis of rotation, which results in a particularly simple and cheap production and a low-noise operation arid an increased service life.

Claims (1)

t · t »t ■ a • t II ·> Protection claims: 1. Permanent-magnet rotor for electric motor with an injected plastic part where and where appropriate cams are injection-molded for a backstop of plastic axially to the rotational axis of the rotor a KunststofjLritzel, dadu rc h ge k ennzei seframe that the plastic part (2) rope st the with low tolerances provided bearing (2a) for the axis of rotation de, lotors bildet-, ο TP 3 tor -ach claim i, characterized nzeichnet geke n that the ts to ff pinion (3) a part of the superimposed (La) 'f>. Rotor according to A .spruch \ oisr 2, aa by goltena indicates that the Er.nstr ^ of f part ^f 2) with his "hen Ausaehmuiigen (-7) and killen (6, 5a) is before . \ En that ^ one ^t "nd strength everywhere ip ctwe, the same is"'