Electric tool with a contactless torque measurement device and method for measuring the torque of an electric tool

A technology for electric tools and torque measurement, which is applied in the direction of measuring devices, motor tools, torque measurement, etc., can solve problems such as complex structures and large spaces, and achieve the effect of simple structures

Inactive Publication Date: 2010-11-03
C.& E.泛音有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A structure with multiple coils results in a relatively complex structure and requires more space

Method used

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  • Electric tool with a contactless torque measurement device and method for measuring the torque of an electric tool
  • Electric tool with a contactless torque measurement device and method for measuring the torque of an electric tool
  • Electric tool with a contactless torque measurement device and method for measuring the torque of an electric tool

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Experimental program
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Embodiment Construction

[0053] figure 1 The power tool according to the invention is shown in a greatly simplified manner and is designated as a whole by the reference numeral 10 . In the shown case it is a pistol-style screwdriver. The power tool 10 has a housing 12 in which an electric motor 14 is accommodated, which has a stator 16 and a rotor 18 . The rotor 18 is connected with the motor shaft 20 , the motor shaft drives the transmission device 22 , and the transmission device 22 transmits the drive shaft 24 . The drive shaft 24 is finally connected to a tool holder 26 to which a tool 28 is releasably fastened. In the case shown, this tool can be, for example, a screwdriver bit.

[0054] According to the invention, the known power tool 10 is now additionally provided with a torque measuring device operating without contact, which is designated as a whole by the reference numeral 30 . The torque measuring device 30 has two components, a first fixed component 32 fixed on the housing 12 and a se...

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PUM

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Abstract

The electric tool has a torque measuring device (30) and a motor that is accommodated in a housing. The motor comprises a stator and a rotor. A motor shaft drives a drive shaft for driving the tool. The electric tool also comprises a first coil (44) fixedly housed on the stator or the shell and a second coil (46) housed on the rotor or the drive shaft, wherein the second coil is connected with a torque sensor (52) and the coils (44, 46) are inductively connected with each other for bidirectionally transmitting energy to supply energy to the torque sensor (52) and to transmit an output signal of the torque sensor to the first coil and to evaluate the output signal to generate a torque output signal.

Description

technical field [0001] The invention relates to an electric tool, in particular a screwdriver, which has a non-contact torque measuring device, a motor accommodated in a housing, a motor shaft and a torque sensor for measuring torque, wherein the motor shaft drives on the drive shaft of the drive tool. [0002] The invention also relates to a method for measuring torque in a power tool with contactless transmission. Background technique [0003] It is increasingly common for screwdrivers to properly maintain a constant starting torque when starting bolt tightening. For this purpose, the screwdriver must be provided with a precisely operating system which ensures that the screwdriver is switched off when a fixed starting torque is reached. [0004] Various mechanical solutions are known in the prior art for this purpose, such as the use of shut-off connectors or other measures, however, these measures always have a certain degree of inaccuracy. Reasons for this, apart from...

Claims

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Application Information

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IPC IPC(8): B25B21/00B25B23/147G01L3/10
CPCB25B23/14B25B23/147G01L3/108G01L1/225
Inventor 莱纳·蔡比施
Owner C.& E.泛音有限公司
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