Bogie Side Beam Structure With Bolted Joints and Cantilevered Mounts
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Solution Overview
Problem
Existing railway vehicle bogie frames face challenges in structural weight reduction, strength, reliability, and maintainability, particularly in welded joints, and there is a need for improved space utilization around the bogie frames for additional components.
Innovation Solution
A side beam for a railway vehicle bogie frame is designed with discrete structural members joined by bolt connections, featuring cantilevered suspension mounts and reinforcing components, allowing for additional space for vehicle components and improved load transfer, using aluminium and steel alloys for lightweight yet strong construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welded joints are used to connect structural members, then structural strength is improved, but residual stresses and heat affected zones reduce reliability
Solution Approach 1:
The side beam is divided into discrete structural members (centre plate, suspension mounts, reinforcing components) that are connected by bolt connections rather than welded joints. This segmentation allows each component to be independently manufactured and assembled, avoiding the residual stresses and heat affected zones associated with welding while maintaining structural integrity through the bolted assembly.
2Weight of moving object
If lightweight aluminium alloy is used for bogie frame construction, then vehicle weight is reduced, but strength and reliability of welded joints deteriorate
Solution Approach 1:
The patent replaces the welding process with a mechanical fastening system using bolt connections. This substitution eliminates the thermal effects and material degradation associated with welding aluminium alloy, while the mechanical bolted joints provide reliable strength comparable to or exceeding welded connections, particularly in the context of discrete structural members.
3Volume of moving object
If suspension mounts are extended in transverse direction to create additional space, then space for components is improved, but structural complexity increases
Solution Approach 1:
The suspension mounts serve dual functions: they provide the necessary suspension mounting points for wheelset suspension elements and simultaneously create additional transverse space for housing other vehicle components (such as yaw dampers and anti-rolling systems). This multi-functionality eliminates the need for separate structural elements dedicated solely to providing space, thereby reducing overall structural complexity while increasing available volume.
Data Source
AI summary
A side beam of a railway vehicle bogie frame in which two such side beams define respective lateral sides of the bogie frame in relation to a longitudinal direction of the railway vehicle and a crossbeam extends over a transverse direction of the railway vehicle to join the side beams, the bogie frame being configured to carry, in use, front and rear wheelsets. The side beam is formed of discrete structural members comprising an elongate centre plate which extends between first and second end portions thereof in the longitudinal direction between positions occupied, in use, by the wheelsets, a thickness direction of the centre plate being parallel to the transverse direction, and first and second suspension mounts configured for mounting wheelset suspension elements thereto. The first and second suspension mounts are cantilevered from respectively the first and second end portions of the centre plate such that each suspension mount extends upwardly and longitudinally away from a respective junction with its end portion of the centre plate to define a space below the suspension mount for joining the suspension elements to the respective wheelset. At the respective junction each suspension mount has a greater width in the transverse direction than the thickness of the centre plate such that the suspension mounts protrude outwardly in the transverse direction from the centre plate. The discrete structural members are joined together by respective bolt connections.