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Hand machine tool with brushed motor

A hand-held power tool and brush technology, which is applied in the direction of manufacturing tools, electric components, circuits, etc., can solve the problems of enlarging the brush structure length, brush holder system, comfort loss and safety loss, etc., and improve the structure space. Effectiveness of utilization, improved functional reliability, reliable electrical contact

Active Publication Date: 2010-03-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increases the structural length of the brushes and the radial projection of the cover of the brush holder system beyond the circumference of the motor housing, where the associated loss of comfort must be tolerated when the motor housing is used as a handle and loss of security

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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Embodiment Construction

[0029] exist figure 1 The hand-held power tool shown in the center is designed as an angle grinder 10 and, viewed from the left, has a gear housing 12 at the front, which is made of metal. From here downwards, parallel to the vertical axis 20 of the angle grinder 10 , there is a drive shaft (not shown) for receiving a grinding disc (not shown), which is surrounded by the protective cover 14 . At the bottom, on the transmission housing 12 there is a pot-shaped motor housing 16 defining the longitudinal axis 18 of the angle grinder 10 , that is to say made of a tubular part and configured with a flange, which receives the An electric motor 50 ( image 3 ). The axis of the motor is the motor axis and is identical to the longitudinal axis 18 . In the center of its upper side, the motor housing 16 has a service opening 23 which can be closed in a sealing manner by means of a cover 24 which coincides exactly with its edge. The cover 24 can be screwed flush onto the motor housing...

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Abstract

A hand machine tool (10), e.g. an angle grinder, has a motor housing (16) which accommodates an electric motor (50) with a motor axis (18, fig 1) running along the length of the motor tool. The motor(50) consists of a rotor (54) with a collector (52) and of a stator (56) with a stator winding and an end winding (60). Brushes (39), associated with the collector (52), are mounted in a spring-loadedmanner in the duct (38) of a brush holder (28, fig 4) fixed in the motor housing (16). The motor is positioned in a space-saving manner in the motor housing (16) by positioning a spring (30) acting on the brush (39) axially in front of the duct (28), i.e. on its side which faces the stator winding (58), in particular in alignment with the motor axis (18).

Description

technical field [0001] The invention relates to a hand-held power tool according to the preamble of claim 1 . Background technique [0002] Electric hand-held power tools are now mostly driven by electric universal motors, that is to say commutator motors or brushed motors. In this case, the alternating current, for example the alternating current line or via the battery, is transmitted to the commutator of the rotor via the two brushes located in the brush holder. As a result, the rotor rotates and enables a work movement of the hand-held power tool. [0003] Brushed motors are usually installed in hand-held power tools such that the commutator is at their rear end, since the rotor shaft facing forward is formed in front of the driven shaft or fitted here into the transmission of the hand-held power tool And drive the driven shaft indirectly. At the rear end, a brush holder with brushes is spatially arranged with the commutator and fixed in the motor housing. [0004] T...

Claims

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Application Information

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IPC IPC(8): B25F5/02B24B23/02H02K13/00H02K5/04H02K5/14
CPCH01R39/415H01R39/04H02K7/14H02K5/148
Inventor F·艾森魏因
Owner ROBERT BOSCH GMBH
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