Coaxial double-input gearbox arrangement structure

The utility model provides a coaxial double-input gearbox arrangement structure which enables connection of two power sources and a gearbox to be convenient and reliable and ensures that power outputis not interrupted. The transmission mechanism comprises a double-input shaft and a power output shaft which are coaxially arranged, the double input shafts comprise a second hollow input shaft and afirst input shaft; the first input shaft penetrates through a hollow inner cavity of the second hollow input shaft and is coaxially arranged; the input end of the second hollow input shaft is connected with an external second power source; the input end of the first input shaft is connected with an external first power source; the output end of the second hollow input shaft is fixedly sleeved witha second transmission gear; the output end of the first input shaft is arranged behind the second transmission gear and sequentially sleeved with a coupling synchronizer and output six-gear teeth, the output end of the first i