Composite Wheel Rim Inner Lining for Spoke Attachment
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Solution Overview
Problem
Composite material wheel rims suffer from insufficient stress tolerance and cracking around drilled threaded holes for spoke attachment, leading to inadequate spoke tightness adjustment due to the inherent weaknesses of composite materials in sustaining drilling and cap insertion strains.
Innovation Solution
Incorporating a rigid inner lining chunk within the composite material wheel rim to absorb drilling stresses and strains, allowing for the favorable drilling of threaded holes that can securely join with spoke attachment caps for tension adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If threaded holes are drilled directly into the composite material wheel rim for spoke attachment, then the wheel rim can be assembled with spokes, but the composite material lacks sufficient stress tolerance and cracks easily around the drilled holes
Solution Approach 1:
A metal insert is introduced as an intermediary component between the composite material wheel rim and the threaded hole. The insert is embedded within the composite material during molding, providing a robust substrate for drilling threaded holes while the composite material itself remains undrilled and intact, thus avoiding direct stress concentration on the composite structure.
Solution Approach 2:
The metal insert is pre-installed into the composite material wheel rim during the molding process, before any drilling operations are performed. This preliminary action ensures that the insert is properly positioned and secured, allowing subsequent threaded hole drilling to be performed on the insert rather than the composite material, thereby preventing cracking.
2Strength
If the attachment cap is joined deeply to the threaded hole for secure spoke tightness adjustment, then the spoke connection is stronger, but the drilling and insertion process creates more stress and increases cracking risk in composite materials
Solution Approach 1:
The metal insert serves as a mediator that absorbs all drilling and threading stresses, allowing deep threaded hole formation and secure attachment cap joining without transferring these harmful stresses to the composite material. The insert takes the full burden of the joining process, protecting the composite structure from cracking.
Solution Approach 2:
The metal insert is embedded beforehand to cushion and absorb the stresses that would otherwise be imposed on the composite material during drilling and attachment cap insertion. This prior cushioning prevents stress concentration and cracking in the composite material while enabling secure spoke attachment.
Data Source
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AI summary
A composite material wheel rim structure (10) is disclosed, where an inner rim surface (11) of the composite material wheel rim (10) is linked by an attachment cap (21) of each spoke (20), and a rigid inner lining chunk (13) is enwrapped by the inner rim surface (11) during the shaping of the composite material wheel rim (10), which enables the drilling of threaded holes (14) at the inner lining chunk (13). And the inner lining chunk (13) is used for the sustaining of the destruction due to the drilling for the threaded holes (14) and of the strain due to the link of the attachment caps (21) of the spokes (20), which enables a handy drilling for the threaded holes (14) at the inner rim surface (11) of the composite material wheel rim (10). And the adjustment of the tightness of a spoke (20) is subject to the adjustment of the depth that the attachment cap (21) joined helically to that threaded hole (14).