Brush device having a spring for an electrical machine

A brush device and technology of brushes, applied in the direction of circuits, current collectors, electrical components, etc., to achieve the effect of increasing wear length, long motor running time, and high on-off times

Inactive Publication Date: 2010-09-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A pressing force with a defined characteristic can therefore only be achieved with a minimum spring rate C

Method used

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  • Brush device having a spring for an electrical machine
  • Brush device having a spring for an electrical machine
  • Brush device having a spring for an electrical machine

Examples

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Embodiment Construction

[0028] figure 1 A schematic side view of a brush arrangement 1 according to the invention is shown for an electric machine, for example a mechanically commutated DC motor used as a starter for a motor vehicle internal combustion engine. The brush device 1 comprises a brush holder 2 in which brushes 3 are mounted. The brushes 3 are made of a material with a high graphite content and are therefore also called carbon brushes. The brush 3 is pressed against the rotating commutator 6 by means of the first and second springs 4 , 5 of the brush arrangement 2 and is thus prestressed. The first and second springs 4, 5 are arranged radially parallel to each other. In a special embodiment, the springs have the same spring rate C 1 And are designed to have the same dimensions, such as spring wire diameter, length and strength. In another special embodiment, the two springs 4 , 5 can also have different spring rates C if they need to bear axial load. The first and second springs 4, 5 ...

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Abstract

The invention relates to a brush device (1) for an electrical machine having a brush mount (2), comprising a brush (3) accommodated therein, having an integrated braided wire (7), comprising a first spring (4), which pretensions the brush (3) against a commutator (6). In order to achieve a long life span in electrical machines having frequent repeat starts and longer running times, at least one second spring (5) is disposed parallel to the first spring (4), which pretensions the brush (3) against the commutator (6).

Description

technical field [0001] The invention relates to a brush arrangement for an electric motor with a brush holder, a brush with integrated litz wires mounted in the brush holder, and a first pretensioning of the brush against the commutator a spring. Background technique [0002] Electric machines (electric motors), DC and three-phase motors have brush pairs that are preloaded against the commutator. [0003] Mechanically commutated DC motors (starters) are mainly used for starting internal combustion engines. Current is conducted through one or more brush pairs via the commutator to the armature winding. These brushes mostly consist of a sintered material with mainly copper and graphite components. Electric brushes are therefore also referred to as carbon brushes. These brushes, as well as the commutator, are subject to wear during operation. Furthermore, DC motors are typically designed for short periods of operation and are normally suitable for 30-60,000 on-off cycles. ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01R39/38
CPCH01R39/381H01R39/40
InventorM·拜尔W·格施维茨
OwnerROBERT BOSCH GMBH