Roller Holder Hardness Zoning for Durable Link Mechanisms
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Solution Overview
Problem
Existing stretching apparatuses face challenges in improving the durability of their link mechanisms, which are crucial for maintaining efficient and reliable operation.
Innovation Solution
The introduction of a roller holder design with protruding portions on the side surfaces, where the hardness of these surfaces exceeds that of the main body, enhancing the structural integrity and durability of the link mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the link mechanism uses a uniform structure throughout, then the manufacturing is simple, but the durability at contact points is insufficient
Solution Approach 1:
The roller holder is designed with localized hardened protruding portions at the contact points while the main body remains softer. This local quality differentiation allows the critical contact surfaces to have enhanced durability through higher hardness, while the rest of the structure maintains its original manufacturing simplicity and toughness.
2Strength
If the link mechanism components are made harder overall, then the wear resistance improves, but the toughness and resistance to impact decrease
Solution Approach 1:
Only the protruding portions that contact adjacent link mechanisms are hardened to increase wear resistance, while the main body of the roller holder retains its original material properties and toughness. This selective hardening prevents the entire component from becoming brittle.
Solution Approach 2:
The roller holder is functionally segmented into a hardened contact portion (protruding parts) and a non-hardened main body. This segmentation allows different material properties to be applied to different functional zones, optimizing both wear resistance and impact resistance.
Data Source
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AI summary
A roller holder 60 for holding a roller of a link mechanism according to one embodiment includes a part 61 to be housed in a roller housing portion of the link mechanism and a part 62 exposed to the outside of the roller housing portion. In plan view, the part 62 of the roller holder 60 includes a protruding portion 62P1 that protrudes to the outside of the part 61 and a protruding portion 62P2 on an opposite side of the protruding portion 62P1. A hardness of each of a side surface 60s1 of the protruding portion 62P1 and a side surface 60s2 of the protruding portion 62P2 is greater than a hardness of the part 61 of the roller holder 60.