Vehicular Door Mirror Restriction Part Prevents Lamp Detachment
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Solution Overview
Problem
Existing vehicular door mirror devices are prone to detachment of the lamp unit from the mirror housing due to external impacts, as they rely solely on engagement claws and latching parts without screw fastening.
Innovation Solution
The mirror housing is designed with a pivotably supported housing main body and a cover with a slit, featuring a restriction part that restricts the displacement of the engagement claw, ensuring it remains engaged with the latching part even under external impacts, and the engagement claw is provided integrally with the housing main body, with a rib-shaped restriction part on the cover opposing the claw to prevent disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lamp unit is mounted on the mirror housing using only engagement claw and latching part without screw fastening, then the manufacturing cost is reduced and assembly is simplified, but the reliability of the mounting connection deteriorates under external impact
Solution Approach 1:
The cover is divided into an upper cover and a lower cover that are positioned on opposite sides of the engagement claw. This segmentation allows the restriction parts to be distributed on both sides of the engagement claw, providing balanced restriction of the claw's displacement in the disengagement direction while maintaining the simple engagement structure.
Solution Approach 2:
The restriction parts on the cover act as intermediary elements between the engagement claw and the housing main body. These restriction parts physically limit the displacement of the engagement claw without requiring direct connection between the claw and the housing main body, thus maintaining the simplicity of the engagement structure while improving reliability.
2Ease of operation
If the engagement claw is made detachable for easy assembly, then the ease of operation is improved, but the stability of the object's composition deteriorates under external impact
Solution Approach 1:
The restriction parts are designed to preemptively counteract the disengagement force generated by external impacts. By restricting the displacement of the engagement claw in the disengagement direction before actual disengagement can occur, the restriction parts prevent the harmful effect of impact forces that would otherwise cause detachment.
Solution Approach 2:
The restriction parts serve as a protective measure that is already in place before external impacts occur. They provide a mechanical constraint that cushions the engagement claw against excessive displacement, preventing damage or detachment that would result from impact forces.
3Manufacturing precision
If additional guide portions are added to guide the cover mounting, then the manufacturing precision is improved, but the device complexity increases and molding cost increases
Solution Approach 1:
The restriction parts are designed to serve multiple functions simultaneously: they restrict the displacement of the engagement claw in the disengagement direction, and they also serve as guide portions that guide the cover during mounting. This multi-functionality eliminates the need for separate guide structures, reducing device complexity and molding cost while maintaining mounting precision.
Solution Approach 2:
The guiding function is merged with the restriction function by designing the restriction parts to have surfaces that both limit claw displacement and guide cover positioning during assembly. This consolidation of functions reduces the number of separate components and features, simplifying the overall structure.
Data Source
AI summary
A vehicular door mirror device is provided which includes an engagement claw provided on one of a lamp unit and a mirror housing being engaged with a latching part provided on the other of the lamp unit and the mirror housing, wherein the mirror housing includes a housing main body that has a mirror housing recess part and is pivotably supported by a base member, and a cover that has the slit formed therein and is mounted on the housing main body so as to cover the housing main body from a side opposite to an open direction of the mirror housing recess part, the cover being provided with a restriction part that restricts displacement of the engagement claw toward a direction in which the engagement claw disengages from the latching part. The lamp unit is thus prevented from detaching from the mirror housing even under an external impact.