Carbon brush with disconnection apparatus

A circuit breaking device and carbon brush technology, which is applied in the direction of circuits, current collectors, electrical components, etc., can solve the problems of damaged coil springs, damaged motors, damaged commutators, etc., and achieves cost reduction, improved bending rigidity, and simple circuit breaking devices Effect

Inactive Publication Date: 2013-06-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this time, transverse forces act on the pressure spring body through the contact of the disconnecting body with the rotating commutator, which can lead to an excessively strong position tilting of the cylindrical helical spring, thereby damaging the helical spring and causing the disconnecting body to be damaged due to excessive force. The position is tilted and broken
In both cases can cause damage to the commutator up to complete destruction of the motor

Method used

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  • Carbon brush with disconnection apparatus
  • Carbon brush with disconnection apparatus
  • Carbon brush with disconnection apparatus

Examples

Experimental program
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Embodiment Construction

[0020] exist figure 1 with 2 A first embodiment of a carbon brush 10 with a disconnecting device 20 is shown in FIG. Such a carbon brush 10 makes electrical contact with the commutator of an electric motor in a known manner, as it does, for example, for domestic or manual electrical appliances, in particular also for hand-held electric power tools. A carbon brush 10 of this type consists of a graphite brush body 11 into which electrical terminals are usually pressed or otherwise connected. The required contact pressure to press the brush body 11 onto the commutator of the electric motor is achieved by a spring element, for example in the form of a helical spring (EP0937320B1).

[0021] The disconnecting device 20 has the purpose of protecting the commutator of the electric motor from mechanical damage or burning after the carbon brushes have worn out. The disconnecting device 20 has a disconnecting body 21 made of an electrically insulating material, which is designed as a ...

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Abstract

The invention relates to a carbon brush (10) with a disconnection apparatus (20), which, in a cavity (12) in the brush body (11), has a disconnection body (21), which consists of an electrically insulating material and has a prestressed compression-spring body (24), which acts resiliently on the disconnection body (21). The compression-spring body (24) and / or the disconnection body (21) are / is formed from plastic.

Description

technical field [0001] The invention relates to a carbon brush with a disconnecting device according to the preamble of claim 1 . Background technique [0002] Carbon brushes of this type are known (DE1679529U1), in which the compression spring body consists of a cylindrical helical spring made of spring steel, which is designed to achieve the smallest possible overall system length of the disconnecting device and the largest possible brush body. A large wear path can be prestressed and compressed to such an extent that its cylindrical winding rests against one another and the spring is prestressed in one block. This determines the maximum available wear path of the brush body, which results from the ratio of the possible theoretical wear path of the brush body to the actual effective length of the disconnecting device. A wear path that is smaller than the effective length of the brush body requires an earlier replacement of the brush body if the wear path exceeds the permi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01R39/58
CPCH01R39/58H01R39/59
InventorM·卢茨
OwnerROBERT BOSCH GMBH