Hydraulic Connecting Rod Length Control for Rail Curve Tilting
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Solution Overview
Problem
The existing railway vehicle suspension systems, particularly anti-rolling torsion bars, cannot adjust connecting rod length in real time to accommodate different curvature radii, affecting safety and comfort during high-speed curve traversal.
Innovation Solution
An active adjustment method for connecting rod length using a hydraulic system driven by atmospheric pressure from the bogie system, allowing real-time conversion between fixed, extended, and contracted states through controlled liquid medium flow, utilizing solenoid valves and sensors for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connecting rod length is kept fixed, then the anti-rolling torsion bar can provide stable bidirectional anti-rolling torque, but it cannot enable the vehicle body to tilt actively when passing through curves at high speed
Solution Approach 1:
The connecting rod length is changed from fixed to dynamically adjustable. The patent implements active adjustment of the connecting rod length through a control system that can extend or contract the connecting rod based on curve detection, enabling the anti-rolling torsion bar to adapt to different operating conditions (straight track vs. curve) and achieve active vehicle body tilting.
2Ease of operation
If large motor or hydraulic pump systems are used to adjust connecting rod length, then real-time adjustment can be achieved, but the system structure becomes complex and power units increase
Solution Approach 1:
The patent uses atmospheric pressure from the bogie system as the power source for adjustment, replacing large motor or hydraulic pump systems. By utilizing the existing atmospheric pressure resource, the system achieves real-time connecting rod length adjustment without adding complex power units, simplifying the overall system structure while maintaining ease of operation.
Solution Approach 2:
The system uses the existing atmospheric pressure from the bogie system to power the connecting rod adjustment, making the system self-sufficient. The atmospheric pressure that already exists in the vehicle is utilized to drive the adjustment mechanism, eliminating the need for separate power units and reducing system complexity.
3Reliability
If the connecting rod length is extended or contracted actively, then the vehicle body can tilt to balance centrifugal force on curves, but the anti-rolling torsion bar may hinder active tilting when the vehicle body is in active tilting state
Solution Approach 1:
The patent implements dynamic adjustment of the connecting rod length to resolve the conflict between anti-rolling and tilting functions. By actively changing the connecting rod length based on curve detection, the system can switch between providing anti-rolling torque on straight tracks and enabling active tilting on curves, thereby improving both safety and comfort without functional conflict.
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 real-time adjustment of connecting rod length for improved safety and comfort by simplifying the system structure, reducing power units, and ensuring passive safety without large motor or hydraulic pump systems, while maintaining anti-rolling functionality.
Implementation Method 1
The liquid media are actively controlled to enter or flow out of the first liquid cavity or the second liquid cavity, so as to realize real-time active conversion of connecting rod length between the two states of length fixing and free extension and contraction. The liquid medium is compressed by atmospheric pressure of gas, and the atmospheric pressure is converted to hydraulic pressure
Data Source
AI summary
An active adjustment method of connecting rod length and an active adjustable connecting rod device, liquid medium is introduced into a first liquid cavity or a second liquid cavity, so that the piston is hydraulically driven to move, thereby realizing contraction of the connecting rod. The control system controls opening sizes and switching frequencies of the valves, to control extension or contraction speed of the connecting rod. To realize this method, design an active adjustable connecting rod device, which comprises two cylinders, a cylinder is connected with a rod body and a gas source by pipelines.