Rail Vehicle Bogey Frame with Pivotable Front Section
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Solution Overview
Problem
Rail vehicles with rigidly guided wheel sets experience increased transverse forces and wear at end wheel sets due to acute striking angles, and existing solutions are often influenced by longitudinal forces, leading to inefficient control and wear issues.
Innovation Solution
A three-axle running gear design with a bogey frame divided into sections, where the front and rear sections are horizontally pivotable relative to a middle rigid section, allowing direct transverse displacement of end wheel sets through pivotable frame sections and adjustable cylinders to manage forces and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wheel sets are guided rigidly in longitudinal direction, then structural simplicity is maintained, but transverse forces and wear at end wheel sets increase
Solution Approach 1:
The bogey frame is designed with a pivotable front section that can rotate horizontally relative to the rigid middle section, transforming the rigid guidance into a dynamic structure. This allows the end wheel set to achieve approximately radial attitude through transverse displacement, reducing acute striking angles and associated transverse forces while maintaining structural simplicity through the use of a single pivot mechanism
2Ease of operation
If transverse displacement of end wheel set is achieved through separate pull rods, then steering capability is provided, but the control effect is negatively influenced by longitudinal forces
Solution Approach 1:
The patent merges the steering function with the bogey frame structure itself by making the front section pivotable, eliminating the need for separate pull rods. This integration ensures that the transverse displacement is directly achieved through the pivotable section without being influenced by longitudinal tractive or braking forces, as the pivot mechanism is mechanically decoupled from the longitudinal force transmission paths
3Object-affected harmful factors
If a middle wheel set is displaced transversely to relieve additional forces, then rail forces are reduced, but device complexity increases
Solution Approach 1:
The bogey frame is segmented into a rigid middle section and a pivotable front section, allowing the front wheel set to be displaced transversely without requiring a separate middle wheel set. This segmentation achieves force relief on the rail while maintaining structural simplicity through the use of a two-section design rather than a three-wheel-set arrangement
Data Source
AI summary
This invention comprises a running gear for rail vehicles with at least three wheel sets housed in a bogey frame and at least one steering device that makes possible a transverse displacement of an end wheel set, wherein the bogey frame, seen in longitudinal direction, has several sections, wherein at least the frontmost section, seen in the direction of travel, in which the leading wheel set is arranged, is connected horizontally pivotable to a second, rigid section, characterized in that at least the frontmost section, seen in the direction of travel, of the bogey frame in which the leading wheel set is arranged is formed as a parallelogram that can be displaced transversely to the longitudinal axis of the bogey frame.