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electric pulse tool

A technology of electric pulses and tools, which is applied in the direction of motor tools, manufacturing tools, metal processing, etc., and can solve the problem of pulse number expansion and other issues

Active Publication Date: 2021-06-15
ATLAS COPCO INDAL TECHN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem associated with undefined pulses is the expansion of the number of pulses required to achieve e.g. a target torque

Method used

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Experimental program
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Embodiment approach

[0018] According to one embodiment, the sensor 25 is arranged on the output shaft 14 . Alternatively, the sensor 25 may be located on the gear unit 13 . However, the sensor 25 may be located elsewhere in the electrical pulse tool 10 . According to an exemplary embodiment of the present invention, the sensor 25 is a torque sensor 25 . According to another exemplary embodiment of the invention, the sensor 25 is a position sensor 25 .

[0019] In electric pulse tools according to the prior art, pulses are generated by applying a fixed current to a motor in the power tool for a fixed time. The problem with this approach is that the pulses cannot be clearly defined. One problem associated with undefined pulses is the spread of the number of pulses needed to achieve eg a target torque.

[0020] However, the inventors have realized that a well-defined pulse can be obtained by controlling the speed of the rotor 12 until it is determined that the play in the gearing 13 closes and t...

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Abstract

The present invention relates to an electrical pulse tool (10) and a method for achieving well-defined pulses in an electrical pulse tool (10). This object is achieved by an electric pulse tool (10), wherein torque is transmitted in pulse form on an output shaft (14) of the electric pulse tool (10). An electric pulse tool (10) includes an electric motor (11) having a rotor (12) and a gear arrangement (13) adapted to drive an output shaft (14). Thus, the electric pulse tool (10) for each cycle is operable to control the speed of the rotor (12) until it is determined that the backlash in the gearing (13) is closed and the gearing begins to move the output shaft.

Description

technical field [0001] The invention relates to an electric pulse tool and a method in an electric pulse tool. In particular, the present invention relates to an electric pulse tool for performing screwing operations in which torque is transmitted in pulses to eg tighten and / or loosen threaded joints. Background technique [0002] Power tools for tightening bolts, screws and nuts are used in many different applications. In some such applications, it is desirable or even required to be able to control the clamping force or at least the associated torque. Such power tools are typically controlled to rotate an output shaft of the power tool to measure torque. When the torque reaches a predetermined value, the electric tool is controlled to stop the rotation of the output shaft. For example, this can be achieved by cutting power to the tool, or it can be achieved by slipping a clutch. [0003] A problem encountered when operating power tools, especially hand-held power tools...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B21/00B25B21/02
CPCB25B21/00B25B21/02B25B23/147B23P19/066B25B23/1475
Inventor A·克洛特布利克斯特C·J·纳赛尔
Owner ATLAS COPCO INDAL TECHN AB