Door Mirror Inner Cover Twist-Lock Assembly Stability
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Solution Overview
Problem
Existing vehicular viewing devices face challenges in easy assembly of the cover body to the support body, leading to instability and complexity in locking mechanisms.
Innovation Solution
A vehicular viewing device design where the cover body is rotated in the insertion hole circumferential direction and locked in both axial and circumferential directions to the support body, utilizing raised portions and recessed portions for stable assembly, with engagement portions to limit unlocking, and guided rotation by the support body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover body is assembled to the support body using conventional locking mechanisms, then the assembly is secure, but the assembly process becomes complex and difficult
Solution Approach 1:
The locking mechanism is segmented into distinct functional elements: the insertion hole with circumferential grooves, the protrusions on the support body, and the engagement portions. This segmentation allows each component to perform a specific locking function independently, simplifying the overall assembly process while maintaining security.
Solution Approach 2:
The cover body and support body are designed to automatically lock together through their geometric features (circumferential grooves and protrusions) when assembled. The structure itself provides the locking function without requiring external locking mechanisms or complex fastening systems, making the assembly self-servicing and simple.
2Stability of the object's composition
If the cover body is locked in multiple directions, then the assembly stability is improved, but the locking mechanism becomes more complex
Solution Approach 1:
The insertion hole features asymmetric circumferential grooves that engage with protrusions on the support body in specific orientations. This asymmetric design provides multi-directional locking (axial and circumferential) through a simple geometric interface rather than a complex multi-component system, achieving stability without increasing mechanism complexity.
3Reliability
If engagement portions are added to limit unlocking, then the locking stability is improved, but the device structure becomes more complex
Solution Approach 1:
The engagement portions are merged with the circumferential grooves of the insertion hole, combining the locking and anti-unlocking functions into a single integrated structural feature. This eliminates the need for separate engagement mechanisms, maintaining reliability while avoiding increased structural complexity.
Data Source
AI summary
In a door mirror device, a base is attached to a vehicle body side, and the base supports a mirror and is covered by an inner cover. Here, the inner cover is rotated in a state in which an insertion tube of the base is inserted into an insertion hole in the inner cover, whereby the inner cover is locked in the axial direction and the circumferential direction of the insertion hole to the base. For this reason, the inner cover can be stably rotated, and the inner cover can be easily assembled to the base.