Motorized Dropper Post Lead Screw Assembly for Low-Noise Load Handling
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Solution Overview
Problem
Traditional bicycle dropper posts face challenges in minimizing internal mechanism height to fit small frames, generating noise due to multiple bearings, and being costly and bulky, while also struggling with high axial loads and noise reduction.
Innovation Solution
A motorized dropper post assembly with sound dampening components, including o-rings and a single ball bearing mechanism, that allows for automated, low-noise adjustment of saddle height, reducing noise and wear, and maintaining alignment, while being compact and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple bearings are used in the dropper post mechanism, then the structural strength and load-bearing capacity are improved, but the noise generation increases and the device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary bearings from the dropper post mechanism. By using only a single bearing at the critical load point rather than multiple bearings throughout the mechanism, the design reduces noise generation while maintaining sufficient structural strength for high axial loads.
Solution Approach 2:
The patent replaces the traditional mechanical bearing system with a hybrid approach that uses a single bearing combined with a lead screw mechanism. This substitution reduces the number of mechanical contact points that generate noise while maintaining the necessary load-bearing capacity through the self-lubricating properties of the lead screw.
2Strength
If multiple bearings are used in the dropper post mechanism, then the structural strength is improved, but the device complexity and cost increase
Solution Approach 1:
The patent removes unnecessary bearings from the mechanism, retaining only a single bearing where it is most needed for structural support. This extraction simplifies the overall mechanism complexity and reduces component count while maintaining the ability to handle high axial loads through the lead screw design.
Solution Approach 2:
The patent merges the functions of multiple bearings into a single bearing combined with the lead screw mechanism. This consolidation reduces device complexity by eliminating redundant components while maintaining load-bearing capacity through the integrated design of the bearing and lead screw system.
3Length of moving object
If traditional dropper post mechanisms are designed, then the internal mechanism height is reduced, but the noise generation and wear increase
Solution Approach 1:
The patent replaces traditional mechanical bearing systems with a lead screw mechanism that has inherent self-lubricating properties. This substitution reduces wear between moving parts and minimizes noise generation while maintaining a compact internal mechanism height suitable for small bicycle frames.
Solution Approach 2:
The patent changes the material parameters and surface properties of the lead screw mechanism to reduce friction and wear. By using materials with self-lubricating properties and optimizing the thread geometry, the design achieves low noise operation and reduced wear while maintaining a compact mechanism height.
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
The motorized dropper post assembly effectively reduces noise and wear, operates efficiently under high loads, and maintains alignment, providing a better user experience with a compact and cost-effective design.
Implementation Method 1
a lead screw that is directly or indirectly mounted to the motor shaft such that the lead screw rotates in unison with the motor shaft
Implementation Method 2
a lead screw nut threaded onto the lead screw and mounted within the upper tube such that the lead screw nut is unable to rotate relative to the upper tube
Implementation Method 3
a motor with a motor shaft that rotates bi-directionally
Data Source
AI summary
A dropper post assembly includes a lower tube and an upper tube slidably mounted to the lower tube. The assembly includes a motor with a motor shaft that rotates bi-directionally. The assembly also includes a lead screw that is directly or indirectly mounted to the motor shaft such that the lead screw rotates in unison with the motor shaft. The assembly also includes a lead screw nut threaded onto the lead screw and mounted within the upper tube such that the lead screw nut is unable to rotate relative to the upper tube. The assembly further includes a lead screw sheath configured to receive at least a portion of the lead screw that extends past an upper end of the lead screw nut.