Liquid Composite Spring Sealing for High-Frequency Stiffness
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Solution Overview
Problem
Traditional rubber cone springs used in rail vehicles experience reduced dynamic stiffness at high frequencies and limited vibration energy dissipation due to the limitations of rubber material, leading to high-frequency dynamic softening and inadequate damping performance.
Innovation Solution
A liquid composite spring is sealed using a flexible sealing member with a sleeve-shaped outer wall and a metal ring, allowing for variable stiffness and improved damping through the formation of a flexible chamber, where the sealing member is connected to the outer wall via a metal ring and vulcanization, and the core shaft is secured with a projecting element and clamping slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rubber cone springs are used, then different values of stiffness in vertical, horizontal and longitudinal directions can be achieved with improved nonlinear characteristics, but the dynamic stiffness is reduced as vibration frequency increases and damping performance is limited
Solution Approach 1:
The patent combines rubber material with liquid damping material to create a composite spring system. The rubber cone spring provides nonlinear stiffness characteristics while the liquid damping material compensates for high-frequency stiffness reduction and enhances damping performance, resolving the contradiction between adaptability and reliability
Solution Approach 2:
The invention merges the rubber cone spring structure with a liquid-filled chamber by integrating the sealing member and liquid damping material into the spring assembly. This combination allows the system to simultaneously exhibit the nonlinear stiffness of rubber and the frequency-independent damping of liquid, addressing both stiffness adaptability and high-frequency reliability
2Adaptability or versatility
If traditional rubber cone springs are used, then nonlinear characteristics are improved, but the capability for dissipating vibration energy is limited due to small damping performance
Solution Approach 1:
The composite structure combines rubber's nonlinear elastic properties with liquid's viscous damping properties. The rubber cone provides the desired nonlinear force-displacement characteristics while the liquid damping material absorbs and dissipates vibration energy, achieving both nonlinear adaptability and effective energy loss
Solution Approach 2:
The invention introduces a liquid damping chamber that utilizes hydraulic principles. The liquid damping material flows through the chamber during vibration, creating viscous resistance that dissipates energy. This hydraulic element complements the rubber's elastic behavior to achieve superior damping performance
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 method provides enhanced stiffness and damping properties, preventing dynamic softening and improving vibration energy dissipation compared to traditional metal-rubber springs, resulting in a more effective suspension system for rail vehicles.
Implementation Method 1
the sealing member is made of flexible material
Implementation Method 2
fixing the metal ring at the bottom of the outer wall through vulcanization
Data Source
AI summary
A method for sealing a liquid composite spring, includes the steps of: placing a sleeve-shaped outer wall around an upper portion of a core shaft, and forming an upper liquid chamber and a lower liquid chamber inside the outer wall; and arranging a sealing member at a bottom of the outer wall to seal the lower liquid chamber, wherein the sealing member is made of flexible material. The liquid composite spring is provided with the rigid outer wall and the flexible sealing member. The volume and shape of the lower liquid chamber can be changed through the flexible sealing member, so that the chamber is formed as a flexible chamber.