Forward and reverse gear synchronous driving mechanism for circulating forward and reverse variable-speed vacuum compressors

The utility model belongs to a vacuum compressor, and particularly relates to a forward and reverse gear synchronous driving mechanism for circulating forward and reverse variable-speed vacuum compressors, which comprises a transition gear shaft A of a reducing mechanism. The forward and reverse gear synchronous driving mechanism is characterized in that the bottom end of the transition gear shaft A is connected with a transition gear A through keys, and the transition gear A is engaged with an input gear; the forward and reverse gear synchronous driving mechanism which comprises a transition gear B, a shaft sleeve, a transition gear C, a transition gear shaft C and a transition gear bracket is mounted on the top of the transition gear shaft A and engaged with the input gear through the transition gear A; the transition gear B is driven by the transition gear A, so that two reversing gears a are synchronously driven in forward and reverse directions. The forward and reverse gear synchronous driving mechanism is reasonably designed and is structurally compact, and moreover, under the condition of low rotational speed after speed reduction, the forward and reverse gear synchronous driving mechanism ensures that the forward reversing gear a and the reverse reversing gear a have the characteristics of little impact, stable and reliable transmission performance and the like.