Rail Vehicle Bogie Traction Device with Adjustable Rubber Bag Pressure
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Solution Overview
Problem
Conventional rail vehicle bogie traction devices fail to provide variable traction stiffness properties, leading to inadequate vibration isolation and potential fatigue damage under alternating loads, which compromises ride comfort.
Innovation Solution
A rail vehicle bogie traction device featuring two traction rubber bag assemblies with fluid-filled rubber bags and a pressure control system, allowing for adjustable pressure and nonlinear stiffness, connected to a center pin and a cross beam, to manage longitudinal loads and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional traction bar with rubber joints is used, then the structure is simple, but the stiffness cannot be adjusted and harmful vibrations are transmitted to the vehicle body
Solution Approach 1:
The patent applies the dynamics principle by making the rubber bag pressure adjustable through a pressure control system. The pressure inside the rubber bag can be dynamically changed to vary the stiffness of the traction device, allowing it to adapt to different operating conditions and vibration frequencies, thereby reducing harmful vibration transmission while maintaining structural integrity
Solution Approach 2:
The patent implements parameter changes by modifying the pressure parameter of the rubber bag to achieve variable stiffness characteristics. By changing the internal pressure of the rubber bag, the traction device can adjust its stiffness parameter in real-time, enabling it to filter out harmful vibrations while maintaining the required load-bearing capability
2Object-affected harmful factors
If joints with gaps are used to achieve nonlinear stiffness, then vibration isolation is improved, but reliability decreases due to potential fatigue damage to rubber joints
Solution Approach 1:
The patent applies pneumatics and hydraulics by using a fluid-filled rubber bag as the elastic element in the traction device. The rubber bag is filled with compressible fluid that provides nonlinear stiffness characteristics similar to gap structures, but without the stress concentration and fatigue damage risks associated with rigid gap joints, thereby improving both vibration isolation and reliability
Solution Approach 2:
The patent employs composite materials by combining the rubber bag (elastomeric material) with the fluid filling (compressible fluid). This composite structure provides the nonlinear stiffness needed for vibration isolation while the fluid-filled design eliminates the stress concentration points found in traditional gap structures, reducing fatigue damage and improving joint reliability
3Force
If the rubber bag pressure is increased to improve load transmission, then longitudinal load transmission is improved, but vibration isolation capability may deteriorate
Solution Approach 1:
The patent applies dynamics by enabling real-time adjustment of the rubber bag pressure through the pressure control system. This allows the system to dynamically optimize the balance between load transmission and vibration isolation by adjusting pressure based on operating conditions, maintaining both force transmission capability and vibration filtering 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 device effectively isolates high-frequency vibrations, providing variable traction stiffness and improved ride comfort by managing longitudinal loads and preventing fatigue damage through adjustable pressure and nonlinear stiffness characteristics.
Implementation Method 1
the rubber bag is filled with fluid, and a pressure of the rubber bag is settable
Implementation Method 2
Each of the traction rubber bag assemblies includes a traction rubber stack and a rubber bag
Implementation Method 3
may effectively transmit a longitudinal load and prevent a high-frequency vibration from transmitting to the vehicle body chassis bolster and the vehicle body via the traction device
Implementation Method 4
a compression elastic member is provided in the rubber bag, the compression elastic member has one end fixed to an inner surface
Data Source
AI summary
A rail vehicle bogie traction device is provided, which includes a center pin and two traction rubber bag assemblies. Each of the traction rubber bag assemblies includes a traction rubber stack and a rubber bag, the rubber bag is filled with fluid, and a pressure of the rubber bag is settable. The traction rubber stack is connected to the rubber bag. The center pin is fixed on a lower surface of a vehicle body chassis bolster. Each of the two traction rubber bag assemblies has one end connected to the center pin, and another end connected to a cross beam of a rail vehicle frame. The rail vehicle bogie traction device has nonlinear characteristics, which may effectively transmit a longitudinal load, and may also prevent high-frequency vibration of the frame from transmitting to the vehicle chassis bolster and the vehicle body via the traction device.