Lifting Column Transmission Assembly for Platform Vibration Isolation
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Solution Overview
Problem
Current lifting column transmission systems experience vibration issues due to electric motors, which are directly fixed to the lifted platform, causing unwanted vibrations and affecting user experience and the service life of the inner tube.
Innovation Solution
A transmission assembly with a hollow spindle, transmission screw, sleeve, and actuating device where the actuating device is securely mounted to the inner tube, allowing vibrations to be transmitted to the first transmission nut and then to the inner tube, rather than directly to the lifted platform, along with a deceleration mechanism using bevel and spur gear planet carriers for smoother power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the actuating device is directly fixed to the lifted platform, then the coupling between the lifting column and the lifted platform is direct and simple, but the vibration from the electric motor is easily transmitted to the lifted platform, causing unwanted vibrations and affecting user experience
Solution Approach 1:
The patent introduces an intermediate coupling structure consisting of a first transmission nut, sleeve, and inner tube assembly that acts as a mediator between the actuating device and the lifted platform. This intermediate structure decouples the direct connection, allowing the actuating device to be mounted to the inner tube rather than directly to the platform, thereby reducing vibration transmission while maintaining functional coupling.
Solution Approach 2:
The coupling structure is segmented into multiple independent components: the actuating device, inner tube, first transmission nut, and lifted platform. By dividing the direct connection into separate segments with relative movement capabilities, the system allows vibration isolation while maintaining the lifting function, resolving the contradiction between structural simplicity and vibration reduction.
2Device complexity
If the actuating device is directly fixed to the lifted platform, then the structure is simple, but the vibration causes the lifted platform to vibrate, affecting use experience and service life
Solution Approach 1:
The inner tube and first transmission nut assembly serve as an intermediary between the actuating device and the lifted platform, providing vibration isolation that protects the platform and extends service life while maintaining a relatively simple transmission structure through screw and nut mechanisms.
3Object-affected harmful factors
If the actuating device is mounted to the inner tube with a sleeve and transmission nut, then vibration transmission to the lifted platform is reduced, but the structure becomes more complex
Solution Approach 1:
The sleeve and first transmission nut act as intermediary components that provide vibration isolation. While these components increase structural complexity, they are essential for decoupling the actuating device from the lifted platform to reduce harmful vibrations.
Solution Approach 2:
The transmission assembly uses a nested structure where the sleeve fits over the hollow spindle, the first transmission nut is mounted on the sleeve, and the actuating device is mounted on the inner tube. This nested arrangement reduces the overall space requirement and organizes complex components in a compact manner.
4Stability of the object's composition
If the upper end of the sleeve is securely fixed, then the transmission structure is rigid and stable, but the vibration stress concentrates on the inner tube, reducing its service life
Solution Approach 1:
The upper end of the sleeve is designed with movable disposition rather than rigid fixation, allowing dynamic adjustment and movement. This dynamic design reduces stress concentration on the inner tube while maintaining transmission stability through the screw-nut mechanism, thereby extending the service life of the inner tube.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces vibration transmission to the lifted platform, minimizes stress on the inner tube, enhances user experience, and improves the service life of the lifting column by decoupling the actuating device from direct contact with the platform and inner tube, resulting in smoother and more stable operation.
Implementation Method 1
The deceleration mechanism comprises a sun gear coupled to an output shaft of the motor, a bevel gear planet carrier transmission-fitted with the sun gear, and a spur gear planet carrier fitted with an output end of the bevel gear planet carrier
Implementation Method 2
a transmission screw disposed in the hollow spindle, a sleeve fitted over the hollow spindle... The transmission screw and the hollow spindle are synchronously rotatable and are axially expandable and retractable relative to each other
Data Source
AI summary
A transmission assembly for a lifting column is provided. The lifting column includes an inner tube. The transmission assembly includes a hollow spindle, a transmission screw, a sleeve sleeved over the hollow spindle, a guide tube limited in the sleeve, and an actuating device actuating the guide tube to rotate. The guide tube and the hollow spindle are synchronously rotatable and axially expandable and retractable relative to each other. The transmission screw and the hollow spindle are synchronously rotatable and are axially expandable and retractable relative to each other. The actuating device is disposed in the inner tube and securely mounted to an upper end of the sleeve. A lower end of the sleeve is securely connected with a first transmission nut that is threadedly-fitted with the hollow spindle, the first transmission nut is securely coupled to the inner tube, and the upper end of the sleeve is movably disposed.