Patent · US Expired

Brush arrangement for an electric machine

US7420311B2 · kind B2 · utility

1Cited by

11References

15Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernhard Rupp · Eppingen, DE
Christian Schindler · Bühl, DE
Mili Tarek · Karlsruhe, DE

Key dates

Filing date	May 14, 2004
Grant date	Sep 2, 2008
Priority date	—
Expiry date	Nov 1, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH01R39/381
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A brush device for an electric machine having at least one brush and at least one element such as a helical, scroll, or plunger spring for pressing each brush against a rotating contact element, for example a commutator. In at least one further element for example a spring tab, counteracts a lifting of each brush away from the contact element. To this end, the spring tab is inclined at an angle, as a result of which it exerts a weaker action when the brush moves in the direction toward the contact element than it does counter to this direction. As a result, the brush can be repositioned, but is prevented from lifting away from the contact element. This also reduces the danger of vibrations.

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