Electric spanners

Abstract

The invention relates to an electric wrench, which comprises a small gear driven by a motor, a large gear engaged with the small gear, a ratchet base, pawls and ratchets, wherein the pawls and the ratchets are fixed on the ratchet base. The electric wrench is characterized in that the large gear is connected with a clutch, which drives the ratchet base to rotate through a clutch spring; a left and a right pawl press plates are arranged on both sides of the ratchets on the ratchet base; and the pawl press plates are fixed on both sides of the ratchets at one end and are lapped on an inclined side of the pawls. By adopting the paw press plate to substitute for cylindrical pin in background technology to achieve connection / disconnection with the pawl, the ratchets may generate impact torque alternately, thus improving the impact torque of the electric wrench and improving the operation stability and reliability of the electric wrench. Due to the usage of the clutch and the clutch spring between the large gear and the ratchet base, the clutch spring sandwiched between the clutch and the large gear may generate larger compression to restrict the relative movement of the clutch when the torque applied to the ratchet is larger than a rated torque, so that the output torque of the ratchets is restrained within a rated torque to provide an overload protection function to the electric wrench.

Description

technical field [0001] The invention relates to an electric wrench driven by a motor, in particular to an electric wrench with a ratchet impact structure. Background technique [0002] The electric wrench commonly used at present, its structural diagram is as follows: image 3 and Figure 4 As shown, it generally includes a motor 1', a pinion 2' connected to the motor shaft, a large gear 3' meshing with the pinion 2', a ratchet 9' and a pawl 8' fixed on the ratchet seat 7', fixed on the There are two cylindrical pins 6' on the ratchet seat 7' and between the ratchet wheel 9' and the ratchet 8', and a flywheel disc 4' is arranged between the ratchet seat 7' and the large gear 3'. When the motor 1' works, the ratchet seat 7' is driven to rotate through the rotation of the pinion 2' and the large gear 3', and the two garden pins 6' on the ratchet seat 7' contact the pawl under the centrifugal force of the flywheel disc 4' 8' is disengaged, and the high-speed rotating pawl 8' ...

AI Technical Summary

Problems solved by technology

But the electric wrench of this kind of structure still has the unsatisfactory place, this electric wrench drives ratchet 8 ' through two cylindrical pins 6 ' that are fixed on the ratchet seat 7 ' and thereby drives ratchet seat 7 ' to complete its high-speed rotation, exists The disadvantages of low impact torque and poor reliability, and the impact torque cannot be adjusted, and there is no overload protection function

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