Under-Bolster Radial Bogie Linkage for Brake Clearance
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Solution Overview
Problem
Existing sub-frame type radial bogies in railway freight cars face challenges in adapting to integrated brakes due to their structural characteristics, complicating assembly and maintenance, and they intersect with other bogie components, making spatial arrangement difficult.
Innovation Solution
The design of an underneath type railway freight car bogie wheelset radial device with connecting rods positioned under the bolster and side frame, utilizing an adapter and lateral arm structure with specific hole arrangements and rivet assemblies, ensuring sufficient strength and rigidity, allowing for independent assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the connecting rods pass through the hole in the center of the bolster with cross arrangement, then the wheelset radial device can be assembled, but the spatial structure becomes complex and intersects with other bogie components making assembly and maintenance difficult
Solution Approach 1:
The connecting rods are extracted from the traditional path through the bolster center and repositioned to pass underneath the bolster. This removes the intersection with other bogie components (side frames, foundation brakes) and simplifies the spatial arrangement, allowing independent assembly and maintenance of the wheelset radial device
Solution Approach 2:
The connecting rods are repositioned from a horizontal cross arrangement through the bolster center to a lower vertical arrangement underneath the bolster. This dimensional change in spatial positioning eliminates interference with upper components while maintaining the functional connectivity between subframes
2Volume of stationary object
If the subframe type radial bogie uses lower pull rod for lever brake to reserve arrangement space, then the bolster structure can be compact, but the adaptability to integrated brakes is poor
Solution Approach 1:
The wheelset radial device structure with connecting rods positioned underneath the bolster creates a universal configuration that can accommodate both traditional lever brakes and integrated brakes. The lower positioning of connecting rods provides flexible space arrangement that supports multiple brake system types without requiring structural modifications to the bolster
Solution Approach 2:
The subframe is divided into adapter and lateral arm components with standardized connecting holes, creating a modular structure that can adapt to different brake system configurations. This segmentation allows the same basic structure to serve multiple brake system types
Data Source
AI summary
An underneath type railway freight car bogie wheelset radial device has front and rear subframes and two cross-arranged connecting rods that are pinned by round pin connectors. The subframe is a combination structure of the adapter and the lateral arm. The connecting rods are arranged under the bolster to form the underneath bogie wheelset radial structure. The height of the central plane of the connecting rod is lower than the height of the central plane of the subframe adapter surface. The adapter has an adapter surface forming an arc-shaped adapter structure and an adapter connecting arm integrated with the adapter surface structure and vertically arranged at one end of the adapter surface; the subframes are fixed to the adapter by the rivet assembly.