Hydraulic Bushing with Liquid Chambers for Rail Vehicle Stability
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Solution Overview
Problem
Rail vehicles experience severe abrasion of wheels and rails during curve running due to the high stiffness of rubber arms used for stable straight running, leading to increased operation costs.
Innovation Solution
A hydraulic bushing with a main spring and cylindrical outer housing, featuring liquid chambers and a flow channel, allows for flexible steering in curves while maintaining stiffness for stable straight running, reducing abrasion through liquid flow and rigidness adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rubber arm with relatively large stiffness is used to ensure stable operation in straight running state, then the vehicle stability is improved, but severe abrasion of the wheel and rail occurs in curve running state
Solution Approach 1:
The rubber arm is transformed into a hydraulic bushing with dynamically adjustable stiffness. The system transitions from a static rigid structure to a dynamic system where the liquid flow between chambers can adapt the stiffness characteristic in real-time based on operational conditions, allowing stable straight running while reducing curve running abrasion.
Solution Approach 2:
The stiffness parameter of the connection element is changed from fixed (rubber arm) to variable (hydraulic bushing). By controlling liquid flow between chambers through orifices, the effective stiffness can be adjusted - higher during straight running for stability, lower during curve running to reduce wheel-rail abrasion.
2Speed
If a rubber arm with relatively large stiffness is used, then the vehicle can travel quickly and stably along the rail, but the operation costs increase due to severe abrasion
Solution Approach 1:
The hydraulic bushing provides dynamic stiffness adjustment that maintains high-speed stable operation when needed while reducing energy loss through abrasion during curve running, thereby optimizing the trade-off between speed performance and operational costs.
Solution Approach 2:
By varying the stiffness parameter of the hydraulic bushing, the system can operate in a high-stiffness mode for straight running at speed, then transition to a lower-stiffness mode for curve running, reducing the energy dissipated through wheel-rail abrasion and lowering overall operation costs.
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 hydraulic bushing enables smooth steering in curves and stable operation in straight runs, reducing wheel and rail abrasion, thus lowering operation costs and enhancing the longevity of rail vehicles.
Implementation Method 1
two liquid chambers diametrically opposite to and spaced from each other are formed on the first rubber body, each liquid chamber extending throughout the first rubber body along an axial direction thereof; and a sleeve mounted on an outer wall of the first rubber body, a groove being formed in a wall of the sleeve. The main spring is disposed inside an inner chamber of the outer housing, and a flow channel for connecting the two liquid chambers with each other is formed between the outer housing and the sleeve through the groove.
Data Source
AI summary
The present invention relates to a hydraulic bushing, including a main spring and a cylindrical outer housing. The main spring comprising: a core shaft; a first rubber body arranged on an outer wall of the core shaft, wherein two liquid chambers diametrically opposite to and spaced from each other are formed on the first rubber body, each liquid chamber extending throughout the first rubber body along an axial direction thereof; and a sleeve mounted on an outer wall of the first rubber body, a groove being formed in an outer wall of the sleeve. The main spring is disposed inside an inner chamber of the outer housing, and a flow channel for connecting the two liquid chambers with each other is formed between the outer housing and the sleeve through the groove. The hydraulic bushing not only can assure stable operation of the vehicle in a straight running state, but also can reduce abrasion of a wheel and a rail in a curve running state.