Dropper Seatpost Stroke Adjustment for Automatic Saddle Height
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Adjustable seatposts on bicycles require manual re-adjustment of saddle height after lowering, causing inconvenience and frustration for riders.
Innovation Solution
A dropper seatpost with a pneumatic and hydraulic cylinder system that allows for adjustable maximum upward stroke, using a control valve and stroke adjustment assembly to set and maintain the desired saddle height automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inner tube height is lowered to save storage space, then storage space is saved, but the rider must spend time readjusting the saddle height
Solution Approach 1:
The system pre-sets the maximum upward stroke of the inner tube through the stroke adjustment assembly, so that when the inner tube is lowered for storage, the saddle height automatically returns to the pre-configured position without requiring manual readjustment. This preliminary configuration eliminates the need for repeated adjustment operations.
2Volume of moving object
If manual readjustment is required after lowering, then storage space is utilized, but rider convenience is reduced
Solution Approach 1:
The dropper seatpost system automatically returns the inner tube to its pre-set maximum upward stroke position using the pneumatic and hydraulic cylinder mechanism, eliminating the need for manual intervention. The system serves itself by maintaining the configured saddle height without requiring rider action for readjustment.
3Device complexity
If the maximum upward stroke is fixed, then the structure is simple, but the system cannot adapt to different riding needs
Solution Approach 1:
The stroke adjustment assembly introduces dynamic adjustability to the maximum upward stroke of the inner tube. Through the floating piston mechanism and oil chamber system, the maximum stroke can be modified according to different riding needs, transforming a static structure into a dynamically adjustable system.
Solution Approach 2:
The system allows changing the maximum upward stroke parameter by adjusting the oil volume in the oil chambers through the floating piston mechanism. This enables the same basic structure to accommodate different stroke lengths by simply changing the oil volume parameter, providing versatility without requiring completely different structural designs.
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
Enables automatic adjustment of saddle height, eliminating the need for manual re-adjustment, thereby enhancing user convenience and saving operational time.
Implementation Method 1
The pneumatic and hydraulic cylinder has at least one cylinder body provided with an upper oil chamber, a lower oil chamber, and an air chamber
Implementation Method 2
The pneumatic and hydraulic cylinder is disposed in the inner and outer tubes for controlling a vertical movement of the inner tube relative to the outer tube
Implementation Method 3
extract an oil from the upper oil chamber or the lower oil chamber or inject the oil into the upper oil chamber or the lower oil chamber, causing the floating piston to move closer to or farther from the bottom cover based on the change in the oil volume
Data Source
AI summary
A dropper seatpost includes an outer tube, an inner tube disposed movably in the outer tube, and a pneumatic and hydraulic cylinder disposed between the inner and outer tubes and having an upper oil chamber, a lower oil chamber, and an air chamber. When the pneumatic and hydraulic cylinder is opened, the upper and lower oil chambers communicate with each other. When the pneumatic and hydraulic cylinder is closed, the upper and lower oil chambers do not communicate with each other. A floating piston is disposed between the air chamber and the lower oil chamber. When an oil is extracted from or injected into the upper oil chamber, or the oil is extracted from or injected into the lower oil chamber, the floating piston is moved toward or away from the bottom end of the pneumatic and hydraulic cylinder, thereby adjusting a maximum upward stroke of the inner tube.