Motor-Driven Rotary Flow Valve for Lightweight Dropper Seatposts
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Solution Overview
Problem
Dropper seatpost assemblies often add undesired weight and complexity to bicycles, and existing actuation mechanisms are slow or cumbersome.
Innovation Solution
A rotary flow control valve assembly is integrated into the dropper seatpost, allowing for rapid, wireless or wired actuation of the seatpost height adjustments using a motor or mechanical actuator, with a focus on minimizing weight and power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dropper seatpost assembly is used to enable saddle height adjustment, then the rider can lower or raise the saddle for different terrains, but the assembly adds undesired weight and complexity to the bicycle
Solution Approach 1:
The patent employs a hydraulic system with fluid pressure to actuate the seatpost assembly. A hydraulic cylinder contains fluid that, when pressurized, drives the seatpost between extended and retracted positions. This hydraulic mechanism enables compact, lightweight actuation compared to traditional mechanical systems, directly resolving the contradiction by providing adaptability through minimal weight addition.
2Adaptability or versatility
If a dropper seatpost assembly is used to enable saddle height adjustment, then the rider can lower or raise the saddle for different terrains, but the assembly increases the complexity of the bicycle system
Solution Approach 1:
The patent integrates the hydraulic actuation system, control valve, and seatpost mechanism into a single unified assembly. The control valve is incorporated within the hydraulic system, and the actuator is combined with the seatpost structure itself. This merging of components reduces the number of separate parts and simplifies the overall system architecture, directly addressing the complexity concern while maintaining full adjustability functionality.
3Speed
If a traditional actuation mechanism is used for dropper seatpost, then the structure can be simple, but the actuation speed is slow and the mechanism is cumbersome
Solution Approach 1:
The hydraulic system utilizes fluid pressure transmission to achieve rapid actuation of the seatpost. When the control valve opens, pressurized fluid quickly drives the piston, enabling fast transition between seat heights. This hydraulic actuation provides high speed performance while maintaining a relatively simple integrated structure, resolving the contradiction between actuation speed and mechanism complexity.
4Productivity
If a rotary flow control valve is used for hydraulic actuation, then quick and efficient height adjustments can be achieved, but the valve assembly adds weight to the system
Solution Approach 1:
The rotary flow control valve is integrated within the existing hydraulic cylinder and actuator assembly. The valve mechanism shares common housing, mounting structures, and fluid passages with the hydraulic system components. This integration allows the valve to be incorporated without adding significant weight, as it utilizes the same structural framework already present in the hydraulic actuation system, thereby achieving fast adjustment speeds with minimal weight penalty.
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 rotary flow control valve enables quick and efficient height adjustments, reducing user perceptible delay and enhancing the rider's control over saddle position for various terrains, while maintaining a lightweight and compact design.
Implementation Method 1
a rotary flow control valve assembly (333) including a rotary flow control valve (420)... controlling a flow of the hydraulic fluid between the inner fluid chamber (410) and the outer fluid chamber (415)
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
An electronic rotary flow control valve assembly comprising: a first fluid chamber (410) comprising a working fluid; a second fluid chamber (415) comprising said working fluid; a flow hole (503) to fluidly couple said first fluid chamber (410) with said second fluid chamber (415); a rotary flow control valve (420) to control a flow of said working fluid through said flow hole (503); and a motor (450) to rotate said rotary flow control valve (420), wherein said motor produces no linear motion and said rotation of said rotary flow control valve by said motor does not require linear motion.