Rail Vehicle Wheelset Guide Central Force Introduction
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Solution Overview
Problem
Existing wheel set guides for rail vehicles with open profile running gear frames face challenges in strength and stability due to lateral introduction of forces, leading to high bending stress and stiffness irregularities.
Innovation Solution
A wheel set guide design where the swing arm bearing is positioned within a central receptacle in the chassis frame, allowing forces to be introduced centrally, and utilizing a rubber-metal bush and fork-like sections to enhance force transmission and stability, with a recess in the I-shaped profile that does not damage the bottom flange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the swing arm bearing is connected to the chassis frame via lateral introduction of force into the lower flange, then the connection is established, but high bending stress and stiffness irregularities occur in open profile running gear frames
Solution Approach 1:
The patent inverts the conventional force introduction approach by transitioning from lateral force introduction into the lower flange to central force introduction through the web of the I-shaped profile. The swing arm bearing is repositioned to bear forces centrally on the web, reversing the traditional mounting approach and eliminating the bending stress problems associated with lateral force application.
Solution Approach 2:
The patent changes the dimensional aspect of force introduction by moving from a lateral (horizontal) force application point to a central (vertical) force application point through the web. This dimensional shift in force transmission path transforms the stress distribution pattern, converting bending moments into more favorable axial and shear stress states.
2Ease of operation
If recesses are created in the web and lower flange to accommodate the swing arm and bearing, then the swing arm connection is enabled, but significant jumps in stiffness and curvatures occur
Solution Approach 1:
The patent applies local quality enhancement by concentrating the connection features precisely where needed - the swing arm bearing is mounted centrally on the web at the optimal location for force transmission. This localized connection approach eliminates the need for extensive recesses in the web and lower flange, maintaining the overall structural integrity and uniform stiffness of the I-shaped profile while enabling secure swing arm attachment.
3Strength
If the swing arm bearing is positioned centrally in the chassis frame, then force introduction is optimized, but the structural complexity increases
Solution Approach 1:
The patent leverages the self-service capability of the I-shaped profile's web, which naturally provides a central mounting location optimized for force transmission. The web's inherent structural properties at its center make it an ideal self-sufficient mounting point for the swing arm bearing, eliminating the need for additional complex reinforcement structures or auxiliary components that would otherwise be required to achieve central force introduction.
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
This design improves the strength and stability of the wheel set guide, reducing stiffness irregularities and manufacturing costs by centralizing force introduction, optimizing weight distribution, and effectively transmitting tensile, compressive forces, and vibrations.
Implementation Method 1
a spring element, which resiliently connects the axle bearing (3) to the running gear frame (1)
Implementation Method 2
the swing arm (6) having an elastic swing arm bearing (7)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a wheelset guide for a rail vehicle, which has a bogie frame (1), comprising at least one longitudinal support (2), and which has a wheelset bearing (3) for a wheelset (4) of the rail vehicle, which wheelset bearing (3) is connected to the bogie frame (1) and has a rocker (6), wherein the rocker (6) is pivotably attached (7) to the bogie frame (1) via an elastic rocker bearing (7) and a pin (8) guided by the rocker bearing (7). In order to improve the strength and stability of the attachment of the rocker (6) to a bogie frame (1) or to the longitudinal support (2) with an open profile, according to the present invention, the bogie frame (1) forms a receptacle (9) for the rocker bearing (7), which is designed such that the force is introduced into the bogie frame (1) via the rocker bearing (7) itself, and the rocker bearing (7) is positioned in the receptacle (9).