A variable amplitude adjusting mechanism, comprising a piston rod, a transmission arm, and a rotatable eccentric wheel, wherein one end of the transmission arm is hinged to the piston rod and the piston rod is slidably arranged;
- the eccentric wheel comprises an eccentric post and an adjusting slider, the adjusting slider is slidably connected to the eccentric post, and the eccentric post is hinged to the transmission arm;
- a motor assembly, wherein a motor output shaft of the motor assembly is connected to an input end of the eccentric wheel, an axis of the motor output shaft is arranged parallel to an axis of the eccentric post, and a sliding direction of the eccentric post is perpendicular to an axial direction of the motor output shaft, wherein
- at least part of the motor assembly is slidably arranged along the axial direction of the motor output shaft;
- and a motor assembly driving mechanism is connected to the motor assembly, wherein the motor assembly driving mechanism is configured to drive at least part of the motor assembly to move along the axial direction of the motor output shaft, so as to drive the eccentric post to slide and adjust a distance between the motor output shaft and the eccentric post;
- wherein the motor assembly comprises a motor stand, wherein the motor stand is provided with a first mounting cylinder and a second mounting cylinder whose axes are perpendicular to each other, wherein the motor output shaft is rotatably mounted in the first mounting cylinder and the motor output shaft slides relative to the first mounting cylinder, and the piston rod is slidably arranged in the second mounting cylinder;
- an outer rotor and a magnet steel piece integrated in the outer rotor are secured onto the motor output shaft, and a coil assembly is sleeved on the first mounting cylinder;
- an upper end of the motor output shaft is connected to the motor assembly driving mechanism, and a lower end of the motor output shaft is provided with a wedge-shaped plane slidably engaged with the eccentric post;
- and
- wherein the motor assembly driving mechanism comprises a knob cover and a threaded slider threadedly engaged with a threaded sleeve on the knob cover, the threaded slider is connected to the top of the motor output shaft through a threaded bearing, and an axis of the knob cover and the axis of the motor output shaft are coaxially arranged;
- a left limit edge and a right limit edge are respectively arranged on both sides of the threaded slider, and extend along the direction of the motor output shaft;
- the left limit edge is slidably arranged in a fixing slot of a fixed shell;
- and the right limit edge is slidably arranged in a fixing slot of a rear shell.