Railway Box Underframe End Structure for High Load
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Solution Overview
Problem
Existing underframe end structures of railway vehicles, particularly the draft, bolster, and buffer type, are complex and costly due to numerous interfaces with the bogie, which complicates manufacturing and limits bearing capacity, making them unsuitable for high-speed and high-compression load applications.
Innovation Solution
A box underframe end structure formed by butt welding aluminum alloy profiles, comprising an end floor, a coupler seat, front and rear draft sills, a rear cross beam, and an underframe boundary beam, which simplifies the structure and welding process, eliminating interfaces with the bogie and enhancing bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a draft, bolster, and buffer structure is adopted with multiple bogie interfaces, then the connection of coupler and bogie is realized, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent merges the draft sill, bolster, and buffer functions into an integrated box underframe end structure. The coupler mounting seat is directly integrated with the underframe boundary beam and end floor, eliminating the need for separate draft, bolster, and buffer components. This consolidation reduces the number of interfaces with the bogie while maintaining reliable force transmission between the coupler and bogie.
2Force
If multiple interfaces with bogie are included, then force transmission is achieved, but manufacturing process becomes complex and cost increases
Solution Approach 1:
The patent combines multiple force transmission paths into a unified box structure where the end floor, underframe boundary beam, and coupler mounting seat work together as an integrated load-bearing system. This reduces the number of separate manufacturing processes and assembly steps required compared to traditional multi-component structures.
Solution Approach 2:
The patent employs aluminum alloy materials for the box underframe end structure, which provide high strength-to-weight ratio and good formability. The aluminum alloy allows for complex box section geometries to be manufactured efficiently through extrusion and welding processes, simplifying production while maintaining force transmission capabilities.
3Strength
If traditional underframe structure is used, then existing design requirements are met, but bearing capacity is insufficient for high-speed and high-compression load applications
Solution Approach 1:
The patent uses aluminum alloy materials with high strength-to-weight ratio to construct the box underframe end structure. The aluminum alloy profiles are formed into box sections that provide enhanced bearing capacity for compression and tension loads, enabling the structure to meet the requirements of high-speed and high-compression load applications while maintaining lightweight characteristics.
Solution Approach 2:
The patent transitions from traditional linear or planar underframe structures to a three-dimensional box configuration. The box sections provide spatial rigidity and enhanced load-bearing capacity in multiple directions, allowing the structure to handle high compression loads, tension loads, and bending moments simultaneously, thus expanding applicability to high-speed rail applications.
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 box underframe end structure achieves a high bearing capacity, capable of transmitting compressive loads greater than 1500 kN and tensile loads greater than 1000 kN, making it suitable for urban, inter-city, and high-speed rail applications.
Implementation Method 1
butt welding aluminum alloy profiles
Data Source
AI summary
A box underframe end structure of a railway vehicle includes an underframe boundary beam, an end beam, a front draft sill, and a coupler mounting seat, and further includes a rear end cross beam located on one side in a rear of the front draft sill, an end floor fixed between the end beam and the rear end cross beam, and a coupler cross beam fixed with the coupler mounting seat into a whole. A draft sill includes the front draft sill and a rear draft sill respectively arranged on a front side and a rear side of the coupler mounting seat. The coupler cross beam, the rear end cross beam, and the end floor are welded and fixed with the underframe boundary beam. The front draft sill, the rear draft sill, and the coupler cross beam are welded and fixed on a lower surface of the end floor.