Vehicle Mirror Drain Wall Design for Liquid Pooling Prevention
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Solution Overview
Problem
Existing vehicle mirror devices face challenges in preventing liquid from pooling between the rotating body and the holding member above the support shaft, particularly due to the design of the support shaft and the placement of holes for power supply, which allows liquids to ingress and pool between components.
Innovation Solution
A mirror device design that includes a support shaft with an insertion hole, a rotating body with an open hole above the insertion hole, a guide portion to direct liquids downward, and a discharge portion to direct liquids from the guide portion to the insertion hole, ensuring liquids are discharged below the support member, thereby preventing pooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If holes are formed in the motor base and cover for power supply wiring through the support shaft, then power and signals can be supplied to the motor, but liquid can ingress into the interior and pool between components
Solution Approach 1:
A liquid discharge path is introduced as an intermediary structure between the power supply holes and the motor interior. This discharge path includes a discharge hole through the motor base and a liquid discharge groove on the inner peripheral surface of the support shaft, creating a mediator that allows liquid to escape from the interior to the exterior, preventing liquid pooling while maintaining the power supply wiring configuration
Solution Approach 2:
The liquid discharge function is segmented into multiple components: the discharge hole through the motor base and the liquid discharge groove on the support shaft. This segmentation allows liquid to be discharged through multiple pathways rather than relying on a single hole configuration, effectively preventing liquid accumulation while maintaining wiring accessibility
Data Source
AI summary
In a door mirror device, a drain wall is disposed on a peripheral edge portion of an open hole in a cover. A first inclined surface is arranged to be separated from and below the drain wall. In a case where liquid entering into the mirror device flows into the open hole in the cover, the liquid travels along the drain wall and flows downward. Then, the liquid reaches a distal end of the drain wall and falls from the distal end of the drain wall onto the first inclined surface. The liquid that has fallen onto the first inclined surface travels along the first inclined surface and flows out to a communication hole. Due to this, the liquid is discharged to below a stand via the communication hole, pooling of the liquid between a cover and a motor base above a support shaft can be suppressed.