Patent · US Expired

Electric motor with a housing for at least two carbon brushes

US7518281B2 · kind B2 · utility

0Cited by

3References

5Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Winfried Habel · Echterdingen, DE
Otto Baumann · Echterdingen, DE
Siegfried Fehrle · Echterdingen, DE
Andre Ullrich · Echterdingen, DE
Michael Weiss · Dittelbrunn, DE
Hardy Schmid · Stuttgart, DE

Key dates

Filing date	May 30, 2003
Grant date	Apr 14, 2009
Priority date	—
Expiry date	Aug 4, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/53143
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electric motor includes carbon brushes (5) disposed in a holder (6) that are pressed by means of a spring force (7) in a radial direction against a jacket face of a cylindrical collector (4) that is fixed to an armature shaft (2) of the motor. The holder (6) for the carbon brushes (5) can be removed from the motor with little effort as a result of a provision of covering means (11, 12) that cover a pivot bearing (3) of the armature shaft (2) to protect it against the entry of dirt on a side of the covering means (11, 12) facing the holder (6) for the carbon brushes (5), provided with one or more chamfers (14, 15) in such a way that the carbon brushes (5) slide over the covering means (11, 12) as the holder (6) is being pulled off and that the carbon brushes (5) thereby are thrust radially outward counter to the spring force (7).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.