Double-rod Piston Telescopic Seatpost Hydraulic Mechanism
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Solution Overview
Problem
Current telescopic seatpost mechanisms require a floating piston to compensate for the variable volume of the fluid reserve chamber, leading to reliability issues and increased mass due to excess fluid, as air leaks can cause the blocking position to become elastic instead of rigid.
Innovation Solution
A double-rod piston divides the fluid chamber into two tanks with constant volume, eliminating the need for a floating piston and reducing fluid requirements, ensuring a more reliable and lightweight assembly by maintaining constant chamber volume throughout the seatpost's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating piston is used to compensate for variable volume in the fluid reserve chamber, then the seatpost blocking reliability is improved, but the device complexity and mass increase
Solution Approach 1:
The patent removes the floating piston from the system entirely. Instead of using a floating piston to compensate for volume changes, the invention uses a fixed piston with variable displacement chambers that eliminate the need for volume compensation mechanisms, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
Rather than using a floating piston to adapt to volume changes, the patent inverts the approach by using a fixed piston with chambers whose volumes naturally vary with seatpost position. The system adapts to position changes without requiring a floating component, achieving reliability through a simpler fixed structure
2Reliability
If a floating piston is used to compensate for variable volume in the fluid reserve chamber, then the seatpost blocking reliability is improved, but the mass of the assembly increases
Solution Approach 1:
The patent removes the floating piston from the system entirely. Instead of using a floating piston to compensate for volume changes, the invention uses a fixed piston with variable displacement chambers that eliminate the need for volume compensation mechanisms, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
Rather than using a floating piston to adapt to volume changes, the patent inverts the approach by using a fixed piston with chambers whose volumes naturally vary with seatpost position. The system adapts to position changes without requiring a floating component, achieving reliability through a simpler fixed structure
3Adaptability or versatility
If a variable volume reserve chamber is used, then the hydraulic system can accommodate seatpost movement, but air leaks can enter the pressurized chamber causing loss of rigid blocking
Solution Approach 1:
The patent divides the hydraulic chamber into two separate chambers: a pressurized chamber and a reserve chamber, separated by a fixed piston. This segmentation prevents air from the reserve chamber from contaminating the pressurized chamber, maintaining reliable rigid blocking while accommodating seatpost movement through controlled fluid displacement
Solution Approach 2:
Rather than using a floating piston to adapt to volume changes, the patent inverts the approach by using a fixed piston with chambers whose volumes naturally vary with seatpost position. The system adapts to position changes without requiring a floating component, achieving reliability through a simpler fixed structure
4Adaptability or versatility
If excess fluid is included to accommodate variable chamber volume, then the hydraulic system can function through full range of motion, but the mass of the assembly increases
Solution Approach 1:
The patent divides the hydraulic chamber into two separate chambers: a pressurized chamber and a reserve chamber, separated by a fixed piston. This segmentation prevents air from the reserve chamber from contaminating the pressurized chamber, maintaining reliable rigid blocking while accommodating seatpost movement through controlled fluid displacement
Solution Approach 2:
The patent changes the volume parameters of the hydraulic chambers dynamically through the fixed piston mechanism. As the seatpost moves, the volumes of the pressurized and reserve chambers change while the total fluid volume remains constant and optimized, eliminating the need for excess fluid
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 configuration enhances the reliability of the seatpost blocking mechanism and reduces the overall mass of the assembly by maintaining constant fluid volume, preventing air leaks and maintaining a rigid blocking position.
Implementation Method 1
an hydraulic system the blocking of which allows to fix the seatpost in a given position
Implementation Method 2
an elastic element associated to an hydraulic system
Data Source
Figure 1
Figure 2
AI summary
Telescopic seatpost hydraulic mechanism for bicycle saddle that comprises a hydraulic system having a chamber with two tanks (3a, 3b) of liquid fluid, a divider piston (4), and a valve (5) that allows or prevents the passage of the fluid between both tanks (3a, 3b), where the chamber (3a, 3b) of the liquid fluid, that comprises a first tank (3a) and a second tank (3b) separated to each other by a divider piston (4), has a capacity that does not vary and the total volume of the fluid between both tanks (3a, 3b), that are located at one and the other sides of the piston (4), is always kept constant; the divider piston (4) is formed by two rods (4a, 4b) that extend respectively to one side and the other of a dividing head (4c), which separates both tanks (3a, 3b) of fluid to each other, one and the other tanks (3a, 3b) being located around each of the said rods (4a, 4b) and in that both rods (4a, 4b) occupy a constant volume in their center; and the valve (5), opens a canal that allows the passage of fluid between both tanks (3a, 3b) without varying the total length of the fluid chamber.