Reflow dynamic coupling transmission system

The invention discloses a reflow dynamic coupling transmission system, comprising: an engine; a motor; a fixed-speed-ratio transmission device that includes an input gear and an output gear engaged with each other; a planet bar device that includes a gear ring, a planet gear, a sun gear and a planet carrier, wherein the sun gear is engaged with both the sun gear and the gear ring, and the planet gear fixedly sleeves the planet carrier and a power output mechanism; a metal belt continuously variable device that includes a driving pulley unit, a driven pulley unit and a metal belt. The engine isconnected with the driving pulley unit through a clutch, the input gear may rotate synchronously with the driving pulley unit, the driven pulley unit is fixedly connected with the sun gear through driven shaft B, and two ends of the planet carrier are fixedly connected with the output gear and the motor respectively. The reflow dynamic coupling transmission system is available for four conditions; a power reflow is provided for each condition; overall transmission efficiency is improved, speed ratio variation range is widened, manufacture cost is reduced, and the reflow dynamic coupling transmission system is quick and compact to mount and uses less space.