Railway Bogie Articulated Frame with Offset Connecting Rods
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Solution Overview
Problem
Current railway vehicle bogies face challenges in balancing space efficiency and weight reduction while accommodating track deviations and engine placement, with rigid frames requiring bulky primary suspensions and articulated frames lacking space for powerful engines.
Innovation Solution
A bogie design featuring an interior articulated frame with connecting rods offset in height and transverse spacing, allowing parallel axle alignment and accommodating track deviations, and incorporating compact primary suspensions for vertical displacement, which reduces mass and allows for engine placement between wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If an interior articulated frame is used, then mass is reduced and manufacturing costs are reduced, but space for housing powerful engines between wheels is limited
Solution Approach 1:
The connecting rods are positioned at a different height level than the articulation joint, creating a vertical offset that generates transverse spacing between rods. This dimensional change in vertical positioning translates to horizontal space creation, allowing engine placement between wheels while maintaining the compact interior frame structure.
Solution Approach 2:
The connecting rods are arranged to extend partially within the space between the wheels, effectively nesting the rod structures within the available bogie footprint. This nesting approach maximizes space utilization, allowing both the connecting rods for track deviation handling and engine components to coexist in the limited interior frame space.
2Device complexity
If connecting rods are positioned at the same height as the articulation joint, then structural simplicity is maintained, but the bogie cannot effectively handle track deviations
Solution Approach 1:
The connecting rods are positioned at a different height level than the articulation joint, creating a vertical offset that generates transverse spacing between rods. This dimensional change in vertical positioning translates to horizontal space creation, allowing engine placement between wheels while maintaining the compact interior frame structure.
3Stability of the object's composition
If a rigid frame is used, then structural stability is improved, but bulky primary suspensions are required which increase mass
Solution Approach 1:
The frame transitions from a rigid structure to a dynamic articulated structure where two half-frames can rotate relative to each other around a longitudinal axis. This dynamic capability allows the frame to adapt to track deviations through articulation rather than requiring bulky primary suspensions, reducing overall mass while maintaining stability.
Solution Approach 2:
The articulation joint changes the structural parameter from fixed rigidity to controlled flexibility, allowing the half-frames to rotate relative to each other. This parameter change enables the system to handle track deviations through angular movement rather than vertical suspension travel, reducing the mass of suspension components required.
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 design achieves a compact, lightweight bogie that efficiently handles track deviations and supports powerful engines, reducing manufacturing costs and improving accessibility while maintaining structural integrity.
Implementation Method 1
the cross-members of the half-frames being articulated with respect to each other to the other by means of articulation so as to allow rotation of one half-frame relative to the other around a substantially longitudinal axis
Implementation Method 2
the connecting rods have the shape of a stirrup and house secondary suspensions, said secondary suspensions allowing relative vertical movement of the bogie with respect to the railway vehicle on which said bogie is mounted
Implementation Method 3
the longitudinal members of a half-chassis rest on one of the axles via at least one primary suspension allowing vertical relative movement of the axle with respect to the half-chassis resting on said axle
Data Source
Figure 1
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AI summary
This bogie comprises two pairs of wheels (2), the wheels (2) of one pair being connected to each other by a shaft to form an axle (4), said axles (4) being connected to each other by two half-frames (8) each comprising two longitudinal members (10) connected to each other by a cross member (12), said longitudinal members (10) resting on one of said axles (4), the cross members (10) of the half-frames (8) being articulated by an articulation means (18) so as to allow a rotation of one half-frame (8) relative to the other around a substantially longitudinal axis (A). Each side member (10) of one half-frame (8) is connected to a side member (10) of the other half-frame (8) by a connecting rod (20) mounted in an articulated manner around transverse axes on said side members (10), said connecting rod (20) extending at least in part in a horizontal plane offset in height from the horizontal plane passing through the articulation means (18).