Synchronizer for recliner, recliner assembly, vehicle seat and backrest thereof

The utility model provides a synchronizer for an angle adjuster, which comprises a first disc-shaped element, a second disc-shaped element, a third disc-shaped element, a fourth disc-shaped element and a fifth disc-shaped element, the second disc-shaped element is used for being connected with the synchronizing shaft or integrally formed with the synchronizing shaft and is provided with a second disc-shaped part; the clamping mechanism is used for axially connecting the first disc-shaped element and the second disc-shaped element; and the concave-convex matching structure is arranged on the first disc-shaped part and the second disc-shaped part and is used for transmitting torque. The utility model further provides an angle adjuster assembly, a vehicle seat and a backrest of the vehicle seat. 本实用新型提供一种用于调角器的同步装置，包括：用于与控制杠杆连接或一体成形的第一盘形元件，具有第一盘形部；用于与同步轴连接或一体成形的第二盘形元件，具有第二盘形部；用于轴向连接所述第一和第二盘形元件的卡接机构和设置在所述第一和第二盘形部上的用于传递扭矩的凹凸配合结构。本实用新型还提供调角器组件、车辆座椅及其靠背。