Railway Bogie Primary Suspension with Interlocking Hook Stops
Solution Overview
Problem
Conventional primary suspension devices for railway vehicle bogies have bulky movement limitation means due to separate and distinct end stops, which increase the overall size and complexity.
Innovation Solution
The use of interlocking hooks with a play engagement to form both upper and lower limit stops, where the hooks are integrated into the suspension device, reducing bulk and incorporating an elastic block housed within a space partly delimited by these hooks, allows for compact movement limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate and distinct end stops are used to limit movements, then movement limitation function is achieved, but the size and complexity of the suspension device increases
Solution Approach 1:
The patent merges the upper end stop and lower end stop into a single integrated limiting means structure. The limiting means comprises a body with an upper limiting surface and a lower limiting surface, combining two separate movement limitation functions into one component, thereby reducing the overall volume and complexity of the suspension device while maintaining effective movement limitation in both directions
Solution Approach 2:
The limiting means serves multiple functions simultaneously: it acts as both the upper end stop and lower end stop, provides structural support, and defines the housing space for the elastic block. This multi-functionality reduces the number of separate components needed, contributing to a more compact suspension device design
2Reliability
If multiple separate components are used for end stops, then movement limitation is achieved, but the number of parts increases
Solution Approach 1:
The patent combines multiple end stop functions into a single limiting means component with integrated upper and lower limiting surfaces, reducing the number of separate parts while maintaining reliable movement limitation in both upward and downward directions
Solution Approach 2:
The limiting means is designed as a universal component that performs multiple functions: limiting upper movement, limiting lower movement, providing structural support, and defining the housing space for the elastic block, thereby reducing overall device complexity
3Volume of moving object
If elastic block is housed in a compact space delimited by hooks, then compactness is improved, but assembly and maintenance complexity may increase
Solution Approach 1:
The patent segments the suspension device into distinct modular components: the limiting means with hooks, the elastic block, and the housing. The hooks are designed as separate removable elements that can be detached to provide access to the elastic block, enabling easy replacement without disassembling the entire device while maintaining compact overall structure
Solution Approach 2:
The hooks are designed with dynamic accessibility - they can be in a closed position to maintain compact structure during operation, and can be opened or removed to provide access for maintenance. This dynamic configuration allows the device to transition between compact operational state and accessible maintenance state
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 configuration minimizes the vertical bulk of the suspension device while maintaining effective movement limitation, enhancing compactness and ease of maintenance by using fewer parts and allowing for easy replacement of the elastic block without disassembly.
Implementation Method 1
elastic suspension means connecting the first part to the second part, the suspension means comprising at least one elastic block
Data Source
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AI summary
The suspension device comprises a first part fixed to a bogie frame, a second part fixed to a bogie axle structure, and elastic suspension means connecting the first to the second part. The primary suspension device includes means (36) for limiting the displacement of the first and second parts relative to each other, the limiting means (36) comprising upper and lower limit stops. The limiting means (36) include a first hook (38) carried by the first part and a second hook (40) carried by the second part, the first (38) and second (40) hooks being engaged with each other with clearance so as to form the upper and lower limit stops.