| 摘要 |
An electric wrench driving system, comprising a motor; a catching system; and a shaft. The catching system is driven by the motor in a rotational movement and further comprises a main body; a catching piece, mounted on the main body and oriented along the direction of the rotational movement, with a heavy end and a light end; a blocking rod; an eccentric arm; and a spring, pulling on the eccentric arm to fix the catching piece on the blocking rod below a threshold velocity of the rotational movement. The shaft has an insertion piece to be engaged by the catching piece for driving the shaft. When the threshold velocity of the rotational movement is exceeded, the eccentric arm releases the catching piece, and in a regular direction of the rotational movement the heavy end is pulled outward, with the light end engaging with the insertion piece of the shaft, driving the shaft. In a reverse direction of the rotational movement the heavy end is pulled outward, with the light end bumping against the insertion piece of the shaft, such that the heavy end engages with the insertion piece of the shaft, driving the shaft.
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