Method for producing rotor unit

Abstract

The invention pertains to a method for producing a rotor unit or a bearing unit, wherein the rotor unit or bearing unit is respectively realized with a rotor or a bearing housing and a plain bearing bush (20) for the rotatable arrangement of the rotor on a spindle, wherein the plain bearing bush is placed into a mould (21), wherein the rotor or the bearing housing is respectively produced by attaching a polymeric material to the plain bearing bush in the mould by means of a transfer moulding process or injection moulding process, wherein the plain bearing bush is composed of a first bush section (25) and a second bush section (26) that is connected to the first bush section, wherein the bush sections are placed into the mould, and wherein the polymeric material is attached to the bush sections.

Description

technical field [0001] The invention relates to a method for producing a rotor unit or a bearing unit, and a corresponding rotor unit or bearing unit, wherein the rotor unit is realized with a rotor and a plain bearing bush for a rotatable arrangement of the rotor on a main shaft, wherein The plain bearing bush is placed in a mold and wherein the rotor is manufactured by attaching a polymeric material to the plain bearing bush in the mould, by means of a transfer molding process or an injection molding process. Background technique [0002] Rotor units made of polymeric materials are well known in the prior art and are commonly used as components in heating circuits or in vehicles, for example canned motors or pumps with impellers formed on the rotor unit. In canned motors, the rotor unit and stator of an electric motor are separated by a can, which is arranged in the air gap between the stator and rotor unit. This makes it possible to seal-tightly separate the rotor unit f...

AI Technical Summary

Problems solved by technology

[0004] In the known manufacturing methods, it is disadvantageous that the transfer molding process and the injection molding process are associated with wide tolerance ranges depending on the materials used

Furthermore, this method does not allow the creation of a sufficiently cylindrical bearing bore in the plain bearing bush, which is why a bearing bore with a slightly larger inner diameter is intentionally created in the central area of ​​the plain bearing bush

However, the inner mandrel of the mold used for this purpose therefore requires forced demoulding, which negatively affects functional properties such as inner diameter and dimensional and positional tolerances

Another disadvantage that can be seen is the required length tolerances that require post-processing of the one-piece plain bearing bushing

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