Linear actuator

A linear actuator comprising a telescoping sleeve (100), the telescoping sleeve (100) being comprised of an inner sleeve (110), an intermediate sleeve (120) sheathing the inner sleeve (110) and an outer sleeve (130) sheathing the intermediate sleeve (120), a base (200) being connected to the intermediate sleeve (120), a motor (300) being arranged on the base (200), a reduction worm gear (400) being pivoted on the base (200) and driven by the motor, a rotor worm (500) being pivoted on the base (200) and engaged with the reduction worm gear (400), a rotor worm gear (800) being pivoted on the base (200), a stator worm (700) being inserted in the rotor worm gear (800) and connected to the outer sleeve (130), and a stator nut (900) being connected to the inner sleeve (110) and engaged with the rotor worm (500),

• wherein the motor (300), the rotor worm (500) and the stator worm (700) arrange at intervals and around a center of the base (200);
• a lateral surface of an output shaft (310) of the motor (300) is formed with output worm teeth (311);
• high-speed worm teeth (410) engaged with the output worm teeth (311) and low-speed worm teeth (420) engaged with actuating worm teeth (520) of the rotor worm (500) are provided on a lateral surface of the reduction worm gear (400);
• an axial direction of the reduction worm gear (400) is perpendicular to axial directions of the motor and the rotor worm (500);
• the rotor worm (500) and the rotor worm gear (800) are engaged by a passive worm gear (600), so that when the reduction worm gear (400) is driven by the motor (300) to rotate, the rotor worm (500) will be driven by the reduction worm gear (400), and the rotor worm (500) will thus drive the passive worm gear (600) to rotate, and the rotor worm gear (800) will be further driven by the passive worm gear (600) to rotate,
• wherein external surfaces of the rotor worm (500), the passive worm gear (600), and the rotor worm gear (800) are formed with driving worm teeth (510), passive worm teeth (610), and outer worm teeth (810), respectively, and
• wherein the driving worm teeth (510), the passive worm teeth (610), and the outer worm teeth (810) are helical teeth.