Headrest structure

A headrest structure comprising a driving part mounted on a seat backrest of an automobile and a headrest part mounted in front of the driving part, characterized in that,

• the driving part comprises a transmission part, a headrest driving seat and an encapsulating shell, wherein the transmission part is provided therein with a gear mechanism and the transmission part is provided thereon with transmission racks along a vertical direction, wherein the headrest driving seat is fixed to the seat backrest, and wherein the transmission part is rigidly connected with the headrest driving seat,
• the headrest part comprises a headrest rear cover plate, and a rear surface of the headrest rear cover plate is provided thereon with rear cover racks along the vertical direction;
• the gear mechanism is engaged between the rear cover racks and the transmission racks;
• wherein the headrest structure further comprises a lead screw motor which drives the gear mechanism to move along the vertical direction according to a principle of a lead screw transmission mechanism, thereby driving the headrest part to move relative to the headrest driving seat,
• the gear mechanism including a nut mechanism, a shaft sleeve, a gear shaft and a pair of gears,
• the gear shaft extending through the shaft sleeve, and the pair of gears being provided at two ends of the gear shaft respectively and engaged between the rear cover racks and the transmission racks,
• the lead screw motor being fixed to the headrest driving seat, and the lead screw motor driving the gear mechanism to move via the nut mechanism during operation, thereby enabling the pair of gears engaged between the rear cover racks and the transmission racks to rotate to drive the headrest rear cover plate to move.