Tangentially symmetric dc motor carbon brush system comprising a spring part being provided with first and second sections fixated to a carbon brush part, a spring part for use in such system, and a dc motor provided with such system

Abstract

A carbon brush spring system comprises a carbon brush arranged at a first terminal surface thereof conductively contacting a rotatable collector body ( ) for electric current transfer. The system furthermore comprises a spring part arranged at a region of the carbon brush away from the first terminal surface to engage with the carbon brush for therewith establishing a current conductive interconnection to an external electric facility. The system furthermore comprises mechanical stabilizing arranged for maintaining a stable position of the carbon brush relative to the rotatable collector body in both radial and tangential directions in a housing. Particularly, the system has a substantially symmetric structure in tangential direction of rotation, through being provided with a first section ( ) and a second section ( ) that collectively constitute the spring part. Furthermore, a carbon brush part ( ) is structurally fixed to the spring part. The first and second members together constitute a symmetric arrangement between the carbon brush part and respective attachment facilities for fixed connection to the housing, wherein the first and second sections at an intermediate range between the carbon brush and the housing are disposed away from each other at a distance that is appreciably larger than either at the carbon brush or at the housing.