DE10053308B4 - Method of mounting a commutator on an armature shaft - Google Patents

Abstract

Method for rotationally and displaceably fastening a commutator (11) on an armature shaft (10), in which the commutator (11) is plugged onto the armature shaft (10), characterized in that after the commutator (11) has been plugged onto the armature shaft (10) by plastic reshaping of the armature shaft (10), a first elevation (13) and a second elevation (15) are formed simultaneously in such a way that the first elevation (13) abuts a first axial surface (12) of the commutator (11) and that the second elevation (15) bears on a second axial surface (14) of the commutator (11).

Description

The present invention relates to a method for rotationally and displaceably fastening a commutator on an armature shaft where the commutator is on the armature shaft is plugged on.

State of the art

In the field of electrical machines it often required to firmly connect a commutator to an armature shaft. It is for this purpose, for example, in brush-commutated DC motors known, the commutator by means of a press connection on the smooth or knurled armature shaft to press on, with a longitudinal or a cross press fit can be provided. Furthermore it is known the commutator for mounting on the armature shaft with a light weight Add game and sinter. Methods are also known in which the commutator is glued to the armature shaft. The known methods have in common, however, that they are relatively complex.

From the DE 519 745 C. a method for fastening the laminated core of rotors of electrical machines is known. Here, the sheets are lined up on a hollow body, then pressed together to form a laminated core and fastened by driving the hollow body with it in the radial direction.

FR 709 389 describes an arrangement an armature shaft and a commutator with the commutator on the armature shaft by means of a positive connection and due to plastic deformations on the armature shaft in the axial direction is fixed.

The US 43 26 333 describes a method for producing a fastening of a commutator on an armature shaft, in which the commutator is placed in a non-positive connection on a shaft section which is structured in the radial direction by means of a series of grooves.

From the DE 36 31 943 C2 is a method for producing a commutator motor with an insulating cover of the rotor shaft, in which an axially compressible sleeve comprising the rotor shaft is placed on the rotor shaft as an insulating cover between an end face of the rotor package and an opposite end face of the commutator, and the commutator is pressed onto the rotor shaft is compressed.

From the DE 79 31 678 U1 Finally, an arrangement for fastening slip rings on peripheral parts is known, in which a bush is pressed onto the peripheral part, on which the slip rings are fastened. It is provided here that the bushing is only firmly connected to the peripheral part in areas lying axially next to the slip rings.

Advantages of the invention

sBy the method according to the invention for non-rotatable and sliding fastening of a commutator on one Armature shaft is provided that after plugging in the commutator on the armature shaft by plastic deformation of the armature shaft first survey and a second survey are formed simultaneously be that the first elevation on a first axial surface of the Commutator rests and that the second 'elevation on a second axial surface of the Commutator is present. As a result, an easy to manufacture, however, secure connection of the commutator and armature shaft is achieved.

It can be done this way increasing the armature shaft diameter Stop or a locking ring held in a recess to be dispensed with. If the first survey and the second survey formed by plastic forming at the same time the commutator during of the forming process essentially in the equilibrium of forces, which is why during the forming process on an additional one Fixing the commutator can be dispensed with.

It can be provided that the first survey and / or the second survey at least over one Extend part of the circumference of the armature shaft. A particularly good one However, strength arises

if both the first survey as well as the second survey covering the entire scope of the Extend armature shaft.

The first survey and / or preferably form the second survey, but preferably the first survey and the second survey, a covenant. In this way, the contact area between the first elevation and the first axial surface or the second Elevation and the second axial surface enlarges what brings advantages in particular with regard to the torsional strength. In particular if the first survey and / or the second survey over the extend the entire circumference of the armature shaft, can be provided that the first survey and / or the second survey by roles a groove are generated, in particular by a spinning roll method.

The first survey and / or the second Can survey are formed by rolling a groove, the respective Groove preferably formed immediately adjacent to the commutator becomes. The rolling of a groove can then in particular in a simple manner carried out if the first survey and / or the second survey is above the should extend the entire circumference of the armature shaft, because then corresponding Ring grooves can be formed.

Alternatively or additionally, it can be provided in the method according to the invention that the first elevation and / or the second elevation are generated by caulking. Especially in case len, in which the first elevation and / or the second elevation do not extend over the entire circumference of the armature shaft, the first elevation and / or the second elevation can be generated exclusively by caulking.

The invention is surprising Based on the knowledge that through the known plastic Forming a shaft not only has sufficient strength in the axial Direction, as for example in the case of shaft ball bearing connections is required can be achieved, but that through a plastic Reshaping the. Armature shaft formed such a rotationally fixed connection that it is sufficient to fasten the commutator, This is especially true if the first survey and / or the second Survey are trained so that they form a covenant.

drawings

The invention is described below the associated Drawings even closer explained.

Show it:

1 a partially sectioned view of a commutator arranged on an armature shaft; and

2 an enlarged view of the in 1 area marked with an X.

description of the embodiments

The 1 and 2 show an arrangement of an armature shaft 10 and a commutator 11 , The commutator 11 is rotatably and displaceably on the armature shaft 10 arranged. The commutator 11 has a first axial surface at its first axial end 12 on the one by plastic deformation of the armature shaft 10 generated first survey 13 is applied. To increase the contact area between the first axial area 12 and the first survey 13 is the first survey 13 formed in the form of a covenant. The commutator 11 shown has a second axial surface at its second axial end 14 on the one also by plastic deformation of the armature shaft 10 generated second survey 15 is applied. To increase the contact area between the second axial area 14 and the second survey 15 is also the second survey 15 trained in the form of a covenant. Both the first survey 13 as well as the second survey. 15 extend over the entire circumference of the armature shaft in the illustrated case 10 , The first survey 13 and the second elevation 15 are formed simultaneously, by rolling corresponding grooves 16 . 17 which are ring grooves in the case shown. The ring grooves 16 . 17 are after plugging in the commutator 11 on the armature shaft 10 immediately adjacent to the commutator 11 educated.

The illustrated embodiment of the arrangement according to the invention provides good torsional and displacement resistance for the commutator 11 ,

The previous description of the embodiments according to the present Invention serves only for illustrative purposes and not for the purpose the restriction the invention. Various changes are within the scope of the invention and modifications possible, without departing from the scope of the invention and its equivalents.

Claims (5)

Method for rotationally and displaceably fastening a commutator ( 11 ) on an armature shaft ( 10 ) where the commutator ( 11 ) on the armature shaft ( 10 ) is plugged in, characterized in that after plugging in the commutator ( 11 ) on the armature shaft ( 10 ) by plastic deformation of the armature shaft ( 10 ) a first survey ( 13 ) and a second survey ( 15 ) are formed simultaneously in such a way that the first survey ( 13 ) on a first axial surface ( 12 ) of the commutator ( 11 ) and that the second survey ( 15 ) on a second axial surface ( 14 ) of the commutator ( 11 ) is present. A method according to claim 1, characterized in that the first survey ( 13 ) and / or the second survey ( 15 ) at least over part of the circumference of the armature shaft ( 10 ) are formed. A method according to claim 1 or 2, characterized in that the first survey ( 13 ) and / or the second survey ( 15 ) are formed in such a way that they form a covenant. Method according to one of the preceding claims, characterized in that the first survey ( 13 ) and / or the second survey ( 15 ) by rolling a groove ( 16 . 17 ) are formed. Method according to one of the preceding claims, characterized in that the first survey ( 13 ) and / or the second survey ( 15 ) are formed by caulking.