Internal-Frame Cam Assembly for Wear-Resistant Fold Hinges
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Solution Overview
Problem
Foldable smartphones face challenges in maintaining high wear resistance and strength of cams due to frequent folding and unfolding, as existing wear-resistant layers on stainless steel cams wear out quickly, leading to reduced durability and user experience issues.
Innovation Solution
A cam assembly with a frame structure that includes wear-resistant materials and fasteners embedded in both cams, providing axial and circumferential support, along with a connector for enhanced strength and wear resistance, using materials like ceramic particle reinforced aluminum matrix composite and stainless steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wear-resistant layer is disposed on the outer surface of a stainless steel cam, then wear resistance is improved, but the cam strength deteriorates
Solution Approach 1:
The cam body is made of aluminum alloy material and the wear-resistant layer is made of ceramic material, forming a composite structure that combines the light weight and corrosion resistance of aluminum alloy with the high wear resistance of ceramic, while maintaining adequate strength
Solution Approach 2:
The wear-resistant layer is selectively applied only on the outer surface of the cam that contacts other components during folding operations, providing localized wear protection where needed most while keeping the overall cam structure lightweight and strong
2Reliability
If the wear-resistant layer thickness is increased, then wear resistance is improved, but the cam strength deteriorates
Solution Approach 1:
The thickness of the wear-resistant layer is optimized to a specific range that provides sufficient wear protection without compromising the overall strength of the cam assembly, balancing durability and structural integrity
3Adaptability or versatility
If frequent folding and unfolding operations are performed, then screen size flexibility is improved, but wear resistance deteriorates
Solution Approach 1:
The ceramic wear-resistant layer on the aluminum alloy cam body provides exceptional耐磨性能 that can withstand the repeated friction and wear from frequent folding and unfolding operations, maintaining reliability despite high cycle usage
Solution Approach 2:
The wear-resistant layer is pre-applied to the cam surfaces before assembly, providing proactive protection against the anticipated frequent folding operations, preventing wear-related failures before they occur
Data Source
AI summary
This application provides a cam assembly, a folding mechanism, terminal device, and a method for manufacturing a cam assembly, and relates to the field of terminals. The cam assembly includes a cam body and a frame. The cam body includes a first cam and a second cam that are oppositely disposed, and a connection body; materials of both the first cam and the second cam include a wear-resistant material; and a first concave portion cooperating with the cam structure is disposed at one end of the cam body. The frame includes a first fastener and a second fastener that are oppositely disposed, and a connector; the first fastener is embedded into the first cam, and the second fastener is embedded into the second cam; extension directions of the first fastener in the first cam include at least the axial direction and the circumferential direction.