Centrifugal Wheel Cap Flaps for Drag and Cooling Trade-off
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Solution Overview
Problem
Existing vehicle wheel designs contribute significantly to aerodynamic drag, particularly due to the open areas between spokes, which increase energy consumption, and current actively-controllable wheels are complex and costly to implement.
Innovation Solution
A mechanically deployable aerodynamic wheel cap system that uses centripetal actuation mechanisms to automatically adjust the position of aerodynamic flaps based on the wheel's angular velocity and deceleration, eliminating the need for electro-mechanical components and allowing for universal application on both sides of a vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If open areas between spokes are increased for brake cooling, then brake cooling effectiveness is improved, but aerodynamic drag increases
Solution Approach 1:
The wheel cap incorporates movable flaps that can dynamically change position between open and closed states. At high speeds, the flaps close to reduce aerodynamic drag. At low speeds or during braking, the flaps open to allow air flow for brake cooling. This dynamic adaptability resolves the contradiction by adjusting the wheel cap configuration based on operating conditions.
2Object-generated harmful factors
If electro-mechanical control systems are implemented for active wheel control, then aerodynamic drag reduction is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The wheel cap system uses the wheel's own rotation to drive the flap mechanism. A centrifugal force mechanism or spring-loaded system automatically opens or closes the flaps based on rotational speed, eliminating the need for external electro-mechanical actuators, sensors, and control electronics. The system serves itself using the kinetic energy already present in the rotating wheel.
Solution Approach 2:
The patent replaces complex electro-mechanical control systems with a purely mechanical or passive centrifugal mechanism. The flaps are actuated by mechanical linkages connected to the wheel hub or by centrifugal force, substituting electronic controls with simpler mechanical means that are more reliable and easier to manufacture.
3Use of energy by moving object
If wheel cap flaps are closed to reduce aerodynamic drag, then energy efficiency is improved, but brake cooling capability deteriorates
Solution Approach 1:
The wheel cap system dynamically adjusts flap position based on vehicle speed and braking conditions. At high speeds during normal driving, flaps close to reduce drag and improve energy efficiency. When braking is detected or at low speeds, flaps automatically open to restore brake cooling capability, thus resolving the contradiction through conditional adaptation.
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
This solution reduces manufacturing costs and effectively minimizes aerodynamic drag at high speeds while ensuring adequate brake cooling at low speeds, enhancing energy efficiency without the need for complex controls or dedicated wheel designs.
Implementation Method 1
an actuation mass that translates at least partially in the guide track from a first position adjacent to a center of the static mechanism hub to a second position disposed further from the center of the static mechanism hub than the first position
Data Source
AI summary
Methods and systems of an active aerodynamic wheel cap device are provided. The active aerodynamic wheel cap device can be mounted to a vehicle wheel and configured to actuate from a flap-open to a flap-closed state. The flap-open state provides an air vent path from an outer portion of a wheel to an internal component of the wheel, especially at low speeds or during braking. The flap-closed state provides a substantially gapless aerodynamic cap for the wheel of the vehicle at highway speeds or during acceleration. The actuation of the active aerodynamic wheel cap device may be based on an all-mechanical controlled centripetal force movement mechanism.