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Hand machine tool with brushed motor

A hand-held machine tool and motor technology, which is applied in the direction of manufacturing tools, electric components, electromechanical devices, etc., can solve the problems of geometric discontinuity, adverse effects on electrical safety, etc., and achieves improved electrical safety, improved mechanical buffering, and fast maintenance. effect of work

Active Publication Date: 2015-05-13
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These recesses form a geometric discontinuity at the edge of the cover and can have an adverse effect on electrical safety if the seals there for the maintenance openings are damaged when the cover is opened

Method used

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  • Hand machine tool with brushed motor
  • Hand machine tool with brushed motor
  • Hand machine tool with brushed motor

Examples

Experimental program
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Effect test

Embodiment Construction

[0029] exist figure 1 The hand-held power tool shown in the center is designed as an angle grinder 10 and has a gear housing 12 made of metal at the front (to the left in the viewing direction). An output shaft (not shown) protrudes from the transmission housing downwards parallel to the vertical axis 20 of the angle grinder 10 in order to receive a grinding wheel (not shown), which is surrounded by a protective cover. A motor housing 16 in the form of a bowl is flanged behind the transmission housing 12, and this motor housing 16 receives a commutator motor or a brush motor, which is usually called a universal motor in hand-held power tools, from which Behind the motor extends a cable 18 for powering the motor.

[0030] The motor housing 16 serving as a handle carries a cover 22 in the center of its upper side, which is fastened on the motor housing 16 flush with the contour by means of cover screws 24 and which here closes a maintenance opening 26 in a dust-tight manner. ....

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PUM

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Abstract

A hand-held power tool 10 comprises a motor housing 16 that serves as a handle, which accommodates an electric collector motor 50. The interior of the motor housing is accessible via a servicing opening 26 of the motor housing, which is closable by a cover 22. The cover has an indentation 29 for engagement of a tool (58, fig 3) for opening the cover. The cover may be fixable to the motor by means of a screwed connection, where spring means (32, fig 4) are arranged between the cover and the housing, which are pre-loaded during the fixing of the cover. The cover may be provided with a plurality of peripheral seals. The cover may have a support element (50, fig 14) for holding down a carbon brush holder (54, fig 15). Preferably, the cover has holding means for holding a spare part, such as a spare carbon brush. The power tool may be an angle grinder.

Description

technical field [0001] The invention relates to a hand-held power tool with a brush motor. Background technique [0002] Hand-held electric power tools are currently usually driven by universal electric motors, ie by commutator motors or brush motors. For the commutation, the current is transmitted from the cable via the brushes to the rotating commutator of the electric motor. The brushes are held by means of brush holders in the motor housing, which in most cases is made of plastic. The brush holder has channels, which guide the brushes. The brush holder is equipped with a spring which presses the brushes against the commutator. The brushes wear at their contact points with the commutator due to friction and are moved axially towards the commutator under the action of the spring corresponding to the loss of length caused by the wear. This maintains the current flow between the commutator and the brushes. During the service life of a hand-held power tool, the brushes m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25F5/02B24B23/02
CPCB24B23/02B24B55/05B25F5/02H02K7/145B25F5/006B24B23/028
Inventor F·艾森魏因T·朔米施
Owner ROBERT BOSCH GMBH
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