Electric screwdriver

Abstract

The invention discloses an electric screwdriver which comprises a striking shaft, a motor, a planetary speed reducing mechanism and a torque monitoring mechanism. One end of a transmission shaft is clamped and tightly matched with an output shaft of the motor, and the other end is provided with a gear part which is internally meshed and fixed with a sun gear of the planetary speed reducing mechanism; the torque monitoring mechanism comprises a driving shaft, a clutch sleeve, a steel ball and a displacement detector; the clutch sleeve, the clutch end I of the striking shaft and the clutch end II of the driving shaft are sequentially sleeved from outside to inside; the clutch end I is provided with a steel ball channel; the clutch end II is provided with a protruding part; and the protruding part outwards extrudes the circular-truncated-cone-shaped inner wall of the clutch sleeve in the radial direction when the protruding part is aligned with the steel ball channel, and the clutch sleeve is made to move in the axial direction, so that torque change of the electric screwdriver is converted into displacement change of the clutch sleeve, the motor is automatically controlled according to the monitoring result, and constant-torque control is achieved. The transmission shaft, the motor and the planetary speed reducing mechanism are integrally assembled, so that low-speed and high-torque output is met, the motion transmission precision is improved, and constant-torque control is facilitated.

Description

technical field [0001] The invention relates to the field of electric tools, in particular to an electric screwdriver. Background technique [0002] An electric screwdriver is an electric tool that can convert the kinetic energy generated when the electric motor rotates into the deformation energy of the threaded connection in the outside world. It is used to tighten and disassemble the threaded connection. It can be widely used in household appliances, automobiles, motorcycles and other industries. [0003] In order to ensure the assembly quality of the product, the operator often needs to use the electric screwdriver to complete the installation of the product's internal threaded connector with a specific torque. Assembly quality. [0004] However, among the current common electric screwdrivers, some electric screwdrivers cannot achieve constant torque operation due to the limitation of their functional principles; although some electric screwdrivers can achieve constant ...

AI Technical Summary

Problems solved by technology

[0004] However, among the current common electric screwdrivers, some electric screwdrivers cannot achieve constant torque operation due to the limitation of their functional principles; although some electric screwdrivers can achieve constant torque, their torque transmission accuracy and detection accuracy are relatively low. The fixed torque control effect is general, and there is a large error between the torque actually processed by the tool on the threaded connection and the expected torque of the operator, which not only affects the assembly quality of the product and its threaded connection, but also is not conducive to the life and operation of the electric screwdriver itself. Safe

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