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Electric machine tool

A technology for electric tools and drive units, which is applied to striking tools, manufacturing tools, lightweight impact tools, etc., can solve problems such as unsatisfactory vibration reduction effects

Inactive Publication Date: 2008-10-08
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting vibration reduction effect is not satisfactory.

Method used

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  • Electric machine tool
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Examples

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Embodiment Construction

[0019] The same elements in the figures are provided with the same reference numerals.

[0020] FIG. 1 shows a pistol-type hand-held electric power tool with a handle 26 . The electric power tool generally comprises various functional assemblies such as a drive unit 10 (for example an electric motor), a transmission unit 11 and a unit for holding and supporting a toothed shaft 14, a unit configured as a spindle 24 for receiving the The tool holder of the plug-in tool, which cannot be seen in the figure, is non-positively connected to this toothed shaft. The plug-in tool, for example a screwdriver or drill bit, can be rotationally and / or impact-driven. In the current design of pistols, the functional assemblies are arranged axially one behind the other and are coupled to one another in a non-positive and / or form-fitting manner. Here, the drive axis 22 of the rotor shaft 29 , the axis 22 b of the toothed shaft 14 and the axis 22 b of the main shaft 24 are arranged axially para...

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Abstract

The invention relates to an electric machine tool, in particular, having the construction of a pistol, comprising a drive unit (10) and a transmission unit (11). At least the drive unit (10) is mounted on an intermediate flange and is provided with a toothed shaft (14) in order to drive a drive train. According to the invention, the intermediate flange is distributed on the drive side and the transmission side of the bearing bridge element (12, 13), which are connected together via a vibration dampening device (15).

Description

technical field [0001] The invention relates to an electric power tool according to the preamble of claim 1 . Background technique [0002] In electric power tools, in particular hand drills and hammer drills, vibrations are generated in particular by the percussion device, which can lead to rapid fatigue of the operator and lead to reduced grip. This vibration is exacerbated by vibrations transmitted from the machining location through the machining tool. It is known to reduce such vibrations or oscillations, for example in the form of partially rubberized handles. The vibration damping achieved in this way is often not sufficient. [0003] Vibration damping is problematic especially for electric power tools of the pistol design, since such tools are characterized by a compact design in which the drive axis is arranged axially parallel to the axis of one or more intermediate shafts and a main shaft. For example, impact drills and hammer drills have this structure. This ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25D17/24
CPCB25D2211/061B25F5/006B25D2250/371B25D2250/121B25D17/24B25D11/062
Inventor D·绍尔
Owner ROBERT BOSCH GMBH
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