Foldable Door Panel Assembly With Precise Sliding Groove Positioning
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Solution Overview
Problem
Existing door panel assemblies in foldable-screen devices suffer from weak strength, difficulty in ensuring position precision, and occupy excessive thickness space, making them unsuitable for modern electronic devices with large displays.
Innovation Solution
The door panel assembly incorporates M limiting structures and M+N kinematic pair sliding grooves, including higher and lower pair sliding grooves, which are integrally formed with the door panel and fastened by limiting structures, enhancing strength and precision without increasing thickness, using injection molding and embedded structures to improve binding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all-in-one injection molding or carbon fiber embedded injection molding is used for the door panel assembly and kinematic pair, then manufacturing efficiency is improved, but strength becomes weak and thickness space is occupied
Solution Approach 1:
The door panel assembly is segmented into multiple independent components: the door panel body, separate kinematic pairs, and limiting structures. This segmentation allows each component to be optimized independently for strength while maintaining manufacturing efficiency through modular assembly processes.
2Strength
If riveting connection is used for the door panel assembly and kinematic pair, then strength is improved, but position precision is not easily ensured and thickness space is occupied
Solution Approach 1:
Limiting structures serve as intermediary elements between the door panel body and kinematic pairs. These limiting structures provide precise positioning and constraint for the kinematic pairs, ensuring high position precision while maintaining connection strength without requiring riveting.
3Strength
If limiting structures are added to fasten kinematic pair sliding grooves, then strength and position precision are improved, but thickness space may be occupied
Solution Approach 1:
The limiting structures are designed to extend primarily in the planar dimensions (length and width) of the door panel rather than in the thickness direction. By utilizing the surface area of the door panel for mounting limiting structures, the design achieves enhanced strength and positioning without significantly increasing the overall thickness of the door panel assembly.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4
AI summary
This application discloses a door panel assembly, a manufacturing method therefor, a rotary shaft mechanism, and an electronic device, and is applied to the field of terminal device technologies. The door panel assembly includes a door panel, including a first surface. A length direction of the door panel is a first direction. M limiting structures are spaced apart from each other on the first surface and/or inside the door panel in the first direction. M+N kinematic pair sliding grooves are spaced apart from each other on the first surface, positions of the M kinematic pair sliding grooves are opposite to positions of the M limiting structures, the M kinematic pair sliding grooves are fastened to the corresponding limiting structures, the N kinematic pair sliding grooves are integrally formed with the door panel, M is a positive integer, and N is a positive integer. In this way, not only strength of the door panel and each kinematic pair sliding groove can be improved, but also position precision of each kinematic pair sliding groove can be improved. The limiting structure is located on the first surface and/or inside the door panel, and does not occupy thickness space of the door panel, and therefore does not affect thickness space of the rotary shaft mechanism, to implement lightening and thinning of the electronic device.