Vehicle Undercover Aerofin for Drag Reduction and Road Impact Protection
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Solution Overview
Problem
Conventional engine room undercover assemblies with guide pins face interference and damage when navigating uneven roads or speed bumps, leading to reduced aerodynamic performance and increased drag due to airflow dispersion.
Innovation Solution
An aerofin is designed to fold into the undercover at low speeds and protrude at high speeds, utilizing a differential airfoil shape and coil spring mechanism to guide airflow centrally, reducing drag and preventing damage from road irregularities without additional sensors or motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide pin is applied to the lower side surface of the undercover to prevent airflow spreading, then aerodynamic performance is improved, but the guide pin is interfered with when passing through uneven roads and speed bumps, causing deformation or breakage
Solution Approach 1:
The guide pin is replaced with a movable aerofin that can dynamically change its position between protruding (for aerodynamic guidance at high speed) and retracted (for protection during low speed or rough terrain). This dynamic adaptability resolves the contradiction by allowing the structure to optimize for aerodynamics when needed while protecting itself from damage when not needed.
2Reliability
If additional sensors and motors are added to control the aerofin position, then aerodynamic performance is optimized at different speeds, but device complexity and costs increase
Solution Approach 1:
The aerofin system is designed to be self-actuating using the existing airflow and vehicle motion. The aerofin naturally protrudes or retracts based on aerodynamic forces and vehicle speed without requiring external sensors or motors. This self-service approach resolves the contradiction by achieving speed-dependent aerodynamic optimization while maintaining simple assembly and low cost.
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 aerofin effectively collects airflow under the vehicle, improving aerodynamic performance by maintaining aerodynamic efficiency only at high speeds and protecting against road hazards, while reducing assembly complexity and costs.
Implementation Method 1
A coil spring may be inserted into any one side of both ends of the fixing pin. The coil spring may be coaxial with the fixing pin, and may have one end fixed to the outside surface of the aerofin to apply a spring force to the aerofin.
Implementation Method 2
When the air under the undercover passes through the aerofin at the traveling of the vehicle, a speed difference and a pressure difference may occur between the inside surface and the outside surface of the aerofin due to a difference of the curvatures of the inside surface and the outside surface of the aerofin.
Implementation Method 3
a cross-sectional shape of the aerofin is an airfoil shape in which curvatures of an outside surface and an inside surface thereof are different from each other in a front-rear direction of the vehicle
Data Source
AI summary
An engine room undercover assembly for a vehicle includes an aerofin mounted on a lower side surface of the undercover to guide airflow under an undercover. In the engine room undercover assembly, the aerofin is configured to maintain a state of being inserted and folded into the undercover when the vehicle is stopped or travels at a speed of less than or equal to a predetermined speed. When the vehicle travels at the speed greater than the predetermined speed, the aerofin protruded to the outside of the undercover to guide the airflow under the undercover.