Railway Brake Disc Assembly With Nut Rotation Restriction
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Solution Overview
Problem
Existing brake disc technologies face challenges in aligning disc bodies with a wheel during fastening, leading to inefficiencies in assembly and potential instability in the braking system.
Innovation Solution
A brake disc design featuring a pair of disc bodies with specific through-holes and positioning units that facilitate alignment with the wheel, utilizing bolts and nuts with restriction walls to secure the disc bodies while preventing nut rotation, ensuring proper engagement and distribution of braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional brake disc design is used, then the structure is simple, but the alignment of disc bodies with the wheel during fastening is difficult
Solution Approach 1:
The brake disc incorporates positioning units (protrusions and recesses) that are pre-formed on the disc bodies and wheel hub respectively. These positioning units are prepared in advance during manufacturing, enabling automatic alignment when the disc bodies are brought together with the wheel hub during assembly, thus solving the alignment difficulty without adding complex adjustment mechanisms.
Solution Approach 2:
The positioning units act as intermediary elements between the disc bodies and the wheel hub. The protrusions on one disc body engage with the recesses on the wheel hub, serving as a mediating mechanism that facilitates precise alignment and positioning during the fastening process, eliminating the need for manual alignment procedures.
2Stability of the object's composition
If disc bodies are fastened to the wheel without positioning units, then the structure is simpler, but the alignment stability is poor
Solution Approach 1:
The positioning units are pre-formed during the manufacturing of the brake disc components. The protrusions and recesses are created in advance with precise dimensions and positions, ensuring that when assembly occurs, the alignment stability is automatically achieved through the mechanical engagement of these pre-prepared features, without requiring additional stabilization mechanisms.
Solution Approach 2:
The positioning units utilize asymmetric geometry where protrusions on one disc body correspond to complementary recesses on the wheel hub. This asymmetric design creates a unique fit that prevents misalignment and ensures stable positioning, as the components can only assemble in the correct orientation, thereby achieving alignment stability through geometric constraints.
3Manufacturing precision
If nuts are allowed to rotate during fastening, then the fastening process is simpler, but the positioning precision is reduced
Solution Approach 1:
The invention extracts the rotational degree of freedom from the nuts during the fastening process by introducing restriction walls. These walls are specifically designed to contact the nuts and prevent their rotation, thereby maintaining positioning precision. The restriction walls are integrated into the positioning units, adding minimal structural complexity while effectively eliminating the harmful rotation effect.
Solution Approach 2:
The restriction walls are pre-configured in the positioning units to counteract the potential rotation of nuts during fastening. By designing the restriction walls to contact the nuts before rotation can occur, the system applies a preliminary anti-action that prevents the positioning precision from deteriorating, ensuring accurate alignment is maintained throughout the fastening process.
Data Source
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AI summary
To facilitate alignment of a pair of disc bodies (10) and a wheel (20), when the disc bodies (10) can be fastened to the wheel (20). A brake disc (100) includes a pair of disc bodies (10) configured to sandwich therebetween a wheel (20) for railway vehicle, each of the disc bodies (10) having a through wall (41) forming a through-hole (44) in a contact surface that contacts a brake pad to brake rotation of the wheel (20). The pair of disc bodies (10) are fastened to each other with the wheel (20) therebetween, by a fastening member (30) including a bolt (31) and a nut (32). The through wall (41) provided on one of the pair of disc bodies (10) is partially provided with a restriction wall (432) that restricts the nut (32) from rotating together with the rotation of the bolt (31) when the pair of disc bodies (10) are fastened to the wheel (20).