Vehicle Mirror Shaft Wall for Wind Noise Reduction
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Solution Overview
Problem
Conventional vehicle outside rearview mirror devices generate whistling noise due to airflow passing through the gap between the mirror base and the mirror housing, which existing designs fail to adequately suppress.
Innovation Solution
A vehicle outside rearview mirror device with a shaft that includes a wall to reduce wind flow rate through the gap between the base and the mirror housing, and a turbulent portion to further decelerate the wind, integrated into the mirror assembly to minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gap between the mirror base and mirror housing is left open for structural simplicity, then manufacturing and assembly are easier, but whistling noise is generated by airflow through the gap
Solution Approach 1:
A wind reducing wall is introduced as an intermediary component within the shaft structure to block and reduce wind flow through the gap between the mirror base and housing. This mediator element effectively suppresses whistling noise without requiring complex structural modifications or additional separate components.
Solution Approach 2:
The wind reducing wall is integrated directly into the shaft structure, merging the noise reduction function with the existing rotational support component. This combination eliminates the need for separate noise reduction parts, maintaining structural simplicity while achieving effective wind noise suppression.
2Object-affected harmful factors
If projections are added to suppress whistling noise, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The wind reducing wall is merged with the shaft structure, combining two functional elements into one integrated component. This reduces device complexity by eliminating separate parts while maintaining effective noise suppression functionality.
Solution Approach 2:
The shaft is given multiple functions: it provides rotational support for the mirror housing and simultaneously incorporates the wind reducing wall to suppress whistling noise. This multi-functionality reduces the overall number of components and simplifies the device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces wind noise by decelerating airflow through the gap, making the noise undetectable to the human ear while reducing the number of components and production costs.
Implementation Method 1
a wall that reduces a flow rate of a wind passing through a gap between the base and the mirror housing is provided to the shaft
Implementation Method 2
a turbulent portion to further decelerate the wind
Data Source
AI summary
In a vehicle outside rearview mirror device including a mirror housing capable of tilting with respect to a vehicle body, the vehicle outside rearview mirror device includes a base fixed to the vehicle body; a shaft fixed to the base; and the mirror housing mounted to the shaft so as to be capable of tilting, wherein a wall that reduces a flow rate of a wind passing through a gap between the base and the mirror housing is provided to the shaft.