TRANSMISSION ASSEMBLY USED FOR LIFTING/LOWERING COLUMN, AND LIFTING/LOWERING COLUMN

摘要

Provided are a transmission assembly used for a lifting/lowering column, and a lifting/lowering column; the lifting/lowering column comprises an inner pipe (8); the transmission assembly comprises a hollow shaft (2), a transmission screw (1), a sleeve (4) fitted on the outside of the hollow shaft (2), a guide pipe (3) limited inside the sleeve (4), and a drive apparatus (5) used for driving the guide pipe (3) to rotate; the guide pipe (3) and the hollow shaft (2) can rotate concomitantly and the guide pipe (3) and the hollow shaft (2) can extend and retract relatively in the axial direction; the transmission screw (1) can rotate concomitantly with the hollow shaft (2), and the transmission screw (1) and the hollow shaft (2) can extend and retract in the axial direction; the drive apparatus (5) is located in the inner pipe (8) and is fixedly mounted on the upper end of the sleeve (4); the lower end of the sleeve (4) is fixedly connected to a first transmission nut (7) threadedly fitted to the hollow shaft (2); the first transmission nut (7) is fixedly connected to the inner pipe (8); the upper end of the sleeve (4) is arranged freely; the vibration caused by the drive apparatus (5) is transmitted to the first transmission nut (7) by means of the sleeve (4), and will not be directly transmitted to the lifting/lowering platform above the inner pipe (8); thus the vibration is reduced, transmission by the transmission assembly is more stable, and the lifting/lowering column has less vibration during lifting/lowering.