The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2014
Filed:
May. 07, 2009
Michael Bayer, Ludwigsburg, DE;
Sven Hartmann, Stuttgart, DE;
Michael Bayer, Ludwigsburg, DE;
Sven Hartmann, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to an electric machine, in particular a commutator machine (), the carbon brushes () of which cooperate with a commutator () to supply the rotor with current, the carbon brushes () being continuously provided or provided in layer sections with different additives such as scouring material, lubricants or similar. To achieve a longer service life for the carbon brushes (), a maximum of half, preferably less than half of all the carbon brushes () of the machine have a significant fraction of an additive, said fraction differing from that of the other carbon brushes ().