Vehicle Sunroof Wind Deflector with Forward-Inclined Mesh
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Solution Overview
Problem
Existing wind deflectors for vehicle sunroofs face a limit in reducing droning noise and wind noise due to the conflicting factors of height, where increasing the deflector height reduces droning noise but increases wind noise, and vice versa.
Innovation Solution
A wind deflector with a mesh deflector that unfolds upward, where the upper end is positioned ahead of the lower end, utilizing a deflector actuator with rotating rear deflector bars, guide bars, and elastic members to change the length and orientation of the deflector, effectively reducing airflow speed and noise without increasing height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the height of the mesh deflector is increased to reduce droning noise, then droning noise reduction is improved, but wind noise increases due to external air hitting against the deflector structure
Solution Approach 1:
The deflector bar is designed to rotate and change length dynamically, transforming from a static structure to a dynamic one. The front deflector bar rotates about a pivot point and changes length through guide bars, allowing the mesh deflector to adapt its position and orientation based on vehicle speed and airflow conditions, thereby reducing both droning noise and wind noise
Solution Approach 2:
The invention changes the parameters of the deflector system by dividing the deflector bar into front and rear sections that can rotate and stretch independently. This allows the mesh deflector to change its effective height, angle, and position, optimizing noise reduction performance across different operating conditions without permanently increasing the deflector's maximum height
2Object-affected harmful factors
If the deflector bar is designed as a single rigid structure, then the structure is simple, but the mesh deflector cannot be properly positioned ahead of the lower end to optimize noise reduction
Solution Approach 1:
The deflector bar is segmented into a front deflector bar and rear deflector bars, allowing independent rotation and positioning. The front deflector bar can rotate about a pivot point and change length through guide bars, while the rear deflector bars provide structural support and connection to the vehicle body. This segmentation enables the mesh deflector to be positioned ahead of the lower end for optimized noise reduction
Solution Approach 2:
The invention adds rotational freedom and length-changing capability to the deflector bar, transforming it from a one-dimensional linear structure to a multi-dimensional dynamic structure. The front deflector bar can rotate in an arc and change length, adding positional degrees of freedom that enable superior noise reduction performance
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 forward-inclined wind deflector design reduces droning noise more effectively than traditional rearward-inclined designs at the same height, while minimizing wind noise and preventing the mesh deflector from being exposed or stuck, thus optimizing noise reduction and operational efficiency.
Implementation Method 1
elastic members providing rotation force to the rear deflector bars to unfold the mesh deflector
Implementation Method 2
guide bars linearly moving the front deflector bar in the longitudinal direction of the rear deflector bars
Implementation Method 3
a mesh deflector reducing a speed of air passing through the mesh deflector
Data Source
AI summary
A wind deflector of a vehicle sunroof for effectively reducing droning noise that is generated when the sunroof is open includes a deflector bar rotating to unfold and fold a mesh deflector and divided into a front deflector bar and rear deflector bars so that a length of the deflector bar is changed by stretching and contracting when rotating the deflector bar. When the mesh deflector bar is unfolded upward with opening of the sunroof, the front deflector bar is linearly moved forward (in a front-rear direction of the vehicle) by guide bars rotatably coupled to a sunroof frame such that an upper end is moved ahead of an lower end of the mesh deflector.