Seat tilt adjustment mechanism and zero-gravity vehicle seat

A seat tilt adjustment mechanism, characterized in that, the seat tilt adjustment mechanism comprises:

• a left and a right base link fixedly mounted to a left and a right link of a seat frame assembly;
• a left and a right tilt adjustment link, wherein lower ends of the left and the right tilt adjustment link are hinged to front ends of the left and the right base link;
• a left and a right front link, wherein upper ends of the left and the right front link are hinged to front ends of a left and a right link of a seat cushion skeleton assembly;
• a transverse link, wherein a left end of the transverse link forms a rotary connection with an upper end of the left tilt adjustment link and a lower end of the left front link respectively, and a right end of the transverse link forms a rotary connection with an upper end of the right tilt adjustment link and a lower end of the right front link respectively;
• and
• a driving electric motor mechanism, wherein the driving electric motor mechanism can, by means of a gear-rack structure, drive the left and the right tilt adjustment link to rotate synchronously, so as to adjust a cushion tilt angle;
• wherein the driving electric motor mechanism includes a left and a right driving electric motor fixedly mounted to inner sides of the left and the right tilt adjustment link, wherein outputs of the left and the right driving electric motors pass through a left and a right shaft hole in the left and the right tilt adjustment link and are exposed on outer sides of the left and the right tilt adjustment link;
• wherein the gear-rack structure includes a left and a right driving gear and a left and a right arc-shaped rack, wherein the left and the right driving gear are fixedly mounted to the outputs of the left and the right driving electric motor assembly, wherein first ends of the left and the right arc-shaped rack are hinged to the front ends of the left and the right base link and are located on front sides of the left and the right tilt adjustment link, wherein the left and the right arc-shaped rack and the left and the right driving gear are permanently kept in a meshed state through stop parts, wherein the left and the right driving gear are driven to rotate by the left and the right driving electric motors wherein a rotation angle of the left and the right tilt adjustment link is controlled by the left and the right driving gear being guided by the left and the right arc-shaped rack.