Dual-shaft hinge parallelism stabilization via enclosure fixing
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Solution Overview
Problem
The parallelism of dual-shaft hinges in pivotally openable/closable electronic devices is unstable due to deflection of rotary shafts, leading to increased manufacturing costs and complexity in achieving high precision assembly.
Innovation Solution
A parallelism stabilization structure with a link unit and fixing unit, comprising connected metal plates forming enclosure sections to securely hold and align rotary shafts, minimizing deflection and maintaining parallelism through enhanced contact areas and torque balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bearing boards with limited thickness are used to support rotary shafts, then the structure is simple and easy to manufacture, but the rotary shafts are likely to deflect and lose parallelism during operation
Solution Approach 1:
The invention transitions from two-dimensional plate support to three-dimensional enclosure support. The fixing members form hollow enclosures that surround the rotary shafts, providing support from multiple directions (top, bottom, sides) rather than just from below through plate thickness. This dimensional change enables enhanced stability without increasing manufacturing complexity.
Solution Approach 2:
The invention uses a composite structure combining multiple fixing members (first and second fixing members) that are connected together. Each fixing member has multiple sections (first connection section, first enclosure section, second connection section, second enclosure section) that work together to form a composite support system, distributing loads and preventing deflection more effectively than a single plate structure.
2Reliability
If precision assembly is increased to reduce deflection of rotary shafts, then parallelism stability is improved, but manufacturing cost and processing difficulty increase
Solution Approach 1:
The invention divides the support structure into segmented fixing members with distinct functional sections. Each fixing member is divided into connection sections (for joining) and enclosure sections (for supporting shafts). This segmentation allows for modular assembly and positioning features that simplify alignment and reduce assembly precision requirements while maintaining shaft parallelism stability.
Solution Approach 2:
The fixing members act as intermediary structures between the bearing boards and the rotary shafts. They provide an intermediate support layer that distributes loads and maintains shaft positions, reducing the direct dependency on high-precision assembly between bearing boards and shafts. The enclosures serve as mediators that constrain shaft movement and maintain parallelism.
Data Source
AI summary
A parallelism stabilization structure of dual-shaft hinge is installable on a pivotally openable/closable electronic apparatus. The parallelism stabilization structure includes a first rotary shaft and a second rotary shaft, which are parallel to each other and a link unit disposed between the two rotary shafts. A fixing unit is disposed between the two rotary shafts. The fixing unit includes two fixing members connected with each other. Two ends of each fixing member are respectively formed with a connection section and an enclosure section in which the first and second rotary shafts are pivotally disposed. The connection sections of the fixing members can be inserted and mated and connected with each other. The first and second rotary shafts can be easily assembled and located at lower cost. In operation, the deflection of the two rotary shafts is minimized to keep the parallelism of the two rotary shafts.