Torque limiting impact mechanism for pneumatic impact wrench

Abstract

The invention relates to a torque limiting impact mechanism for a pneumatic impact wrench. The torque limiting impact mechanism comprises an impact cover, an impact hammer and an impact shaft, wherein the impact cover is driven by a pneumatic motor to rotate at high speed, the impact cover can throw the impact hammer by two impact pins to peen the impact shaft at high frequency, so that the impact shaft can output a continuous impact torque. The torque limiting impact mechanism is characterized in that the radial section of the impact shaft which corresponds to the impact hammer is composed of two circular arcs which are concentric with the axis of the impact shaft and have different radiuses, a smooth curve which connects the end points of the two circular arcs at one side and a straight segment which connects the end points of the two circular arcs at the other side and can pass through the center of the circular arc after being extended. When the pneumatic motor rotates anticlockwise, the impact face of the impact shaft is a plane formed by the straight segment, and the output torque is larger; when the pneumatic motor rotates clockwise, the impact hammer contacts with the impact shaft by ways of plane and line slide contact, the output torque is smaller, and thereby the output torque is limited. The torque limiting impact mechanism is suitable for occasions which need limiting a clockwise output torque and require a larger output torque.

Description

technical field [0001] The invention relates to a pneumatic impact wrench, in particular to a torque-limiting striking mechanism for a pneumatic impact wrench. Background technique [0002] In the prior art, the double-hammer (single-hammer) striking mechanism usually used in the double-hammer (single-hammer) pneumatic impact wrench is driven by the air motor to drive the striking cover and the striking hammer to perform high-speed rotating motion, so that the striking hammer swings, and the high-speed The frequency of knocking hits the shaft, and the shaft outputs continuous impact torque. Where the impact hammer and the striking shaft collide, there is a rigid contact between surfaces, and the output torque of the striking shaft depends on the power of the air motor. For the air motor of the impact wrench, the output power of forward and reverse rotation is basically similar, which makes the output torque of impact wrench forward and reverse also very close. [0003] In ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, the present invention provides a torque-limiting striking mechanism for a pneumatic impact wrench to solve the problem that the forward and reverse output torques of the impact wrench in the prior art are very similar, and the forward and reverse output torques of the impact wrench cannot be simultaneously Problems meeting job needs

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