Railcar Bogie Axle Spring Retention Mechanism
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Solution Overview
Problem
Existing railcar bogies with rubber springs face issues where the springs can fall off or become displaced due to insufficient friction force when the fixed state between the bogie frame and axle box is released, necessitating external support, which increases manufacturing and maintenance costs.
Innovation Solution
The bogie design incorporates axle-box-side and bogie-frame-side supporting and locking members to retain the rubber springs at their predetermined positions, even when the fixed state is released, using supporting members to contact the springs from below and locking members to secure them, eliminating the need for external support during assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If friction force is relied upon to retain the axle spring at its predetermined position, then the structure remains simple, but the axle spring falls off or becomes displaced when friction force is insufficient
Solution Approach 1:
A retaining member is introduced as an intermediary component between the axle spring and the bogie frame/axle box. This retaining member actively engages with both the axle spring and the mounting structure to provide positive retention, eliminating reliance on friction force alone while maintaining structural simplicity.
2Reliability
If external support is provided during assembly and disassembly to prevent axle spring displacement, then the axle spring remains secure, but the work cost increases
Solution Approach 1:
The retaining member is designed to automatically engage with the axle spring during assembly and maintain retention throughout the assembly and disassembly processes. The system serves itself by providing inherent retention capability through the retaining member's engagement mechanism, eliminating the need for external support or additional workers.
3Adaptability or versatility
If the fixed state between the bogie frame and axle box is released, then the bogie can be disassembled, but the axle spring becomes unstable
Solution Approach 1:
The retaining member is pre-configured to maintain engagement with the axle spring even when the fixed state between the bogie frame and axle box is released. This preliminary retention action ensures the axle spring remains stable and secure throughout the disassembly process, preventing displacement or falling off.
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 allows for the retention of rubber springs in a simple structure without increasing manufacturing or maintenance costs, reducing the need for external support during assembly and disassembly, thereby lowering operational expenses.
Implementation Method 1
when the bogie frame is set on the axle spring, the axle spring is compressed by a load exerted from the bogie frame, and thereby spring force (resilient force) is generated
Implementation Method 2
Owing to the spring force, friction force is exerted between the axle spring and the bogie frame as well as between the axle spring and the axle box, and thereby the axle spring is retained at its predetermined position
Data Source
AI summary
A railcar bogie includes: an axle box; a bogie frame; a pair of rubber springs, which are fixed to respective side surfaces of the axle box and the bogie frame; a pair of axle-box-side supporting members provided on respective lower portions of both the side surfaces of the axle box, the axle-box-side supporting members being configured to support the rubber springs when a fixed state between the rubber springs and the bogie frame as well as between the rubber springs and the axle box is released; and a pair of axle-box-side locking members each provided on top of the axle box in a removable manner, the axle-box-side locking members being configured to lock upper portions of the one ends of the rubber springs when the fixed state between the rubber springs and the bogie frame as well as between the rubber springs and the axle box is released.