Low-speed reversion synchronizer

Disclosed is a low-speed reversion synchronizer. When grips (24) in flywheels face upwards in an attached figure 2 and a stress shaft (5) rotates clockwise, two sector gears (4 and 18) simultaneously rotate, and two conical gears (3 and 19) driven by the sector gears simultaneously rotate in opposite directions as the sector gears are face-to-face. As the grips (24) in the two flywheels (10 and 12) are in the same direction, the grip in the flywheel (10) is stressed and drives a sprocket (22) to drive a chain (9) to rotate from bottom to top, while the grip (24) in the flywheel (12) is not stressed. As the conical gears (3 and 19) rotate in the opposite directions, the grip (24) of saw teeth (25) of the flywheel (12) makes the sound of clatter, and the sprocket (22) of the flywheel (12) rotates upwards along with the flywheel (10). When the stress shaft (5) rotates anticlockwise, the grip (24) in the flywheel (10) can also make the sound of clatter, and an output gear (16) rotates from bottom to top regardles