Front Cowl Air Outlets for Leaning Resistance Reduction
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Solution Overview
Problem
Saddle ride type vehicles face resistance issues during turning due to wind sticking to the front cowl, making it difficult to change the vehicle's attitude and increasing the influence of crosswinds.
Innovation Solution
The front cowl design includes left and right air inlets and outlets that guide and discharge running wind, with air outlets positioned at the middle of the cowl's longitudinal length to separate wind from the sides, reducing resistance and improving turning performance. Additionally, the cowl's rear edge contacts the knee grip, guiding wind effectively outside the rider's knees, and the design integrates a radiator with side covers to reduce air resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the side surfaces of the front cowl are made long to improve aerodynamics, then running resistance is reduced, but wind sticking occurs causing resistance to leaning at the start of turning
Solution Approach 1:
The front cowl is divided into multiple functional zones with air inlets and outlets creating segmented airflow paths. The side surfaces include air outlets that discharge running wind to prevent sticking, while the rear edge portion extends to guide wind effectively. This segmentation allows different portions of the cowl to serve different aerodynamic functions simultaneously.
Solution Approach 2:
Different portions of the front cowl have different aerodynamic characteristics optimized for their specific locations. The air outlets are positioned at specific locations to discharge wind at critical points, the guide portion near the headlight directs airflow locally, and the rear edge portion is extended to contact the knee grip for effective wind guidance. Each local area has tailored properties to achieve overall aerodynamic efficiency without compromising turning ability.
2Loss of energy
If the front cowl is extended to improve wind straightening, then running resistance is reduced, but the influence of crosswind is increased
Solution Approach 1:
The harmful sticking wind is extracted from the side surfaces of the front cowl through air outlets that discharge running wind to the outside. This extraction prevents the wind from adhering to the cowl surface and creates controlled airflow paths that reduce both running resistance and crosswind influence by managing wind attachment points.
Solution Approach 2:
The air outlets and guide portions act as intermediaries between the running wind and the front cowl structure. These elements mediate the interaction by directing airflow in controlled manner, allowing the cowl to benefit from wind straightening while preventing harmful wind sticking through the intermediary airflow management features.
3Productivity
If air outlets are positioned at the rear of the front cowl to discharge wind, then wind flow is managed, but turning response is delayed
Solution Approach 1:
The air outlets are positioned on the front side of the middle position of each side surface, which is a preliminary location before the rear portion of the cowl. This preliminary positioning allows wind to be discharged at an optimal point that prevents sticking while maintaining quick response to turning inputs, rather than waiting for wind to reach the rear of the cowl.
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 resistance to leaning during turning, enhances turning performance, and minimizes the impact of crosswinds, while also improving ride comfort and visibility by efficiently managing wind flow and positioning components for reduced air resistance.
Implementation Method 1
a front cowl for covering the front side of the vehicle to straighten a running wind, thereby reducing a running resistance
Data Source
AI summary
An air outlet is formed on each side surface of a front cowl covering a front portion of a vehicle body. The air outlet is located near and on the front side of a middle position defined by the half of the longitudinal length L of the front cowl. Left and right air inlets are formed near a headlight provided on the front surface of the front cowl. A running wind is introduced into the air inlets, passed through the inside of the front cowl, and discharged from the air outlets. The running wind flowing inside the front cowl is disturbed by the running wind discharged from the air outlets, thereby separating the running wind from each side surface of the front cowl.