Straddle-Type Vehicle Shroud and Lower Bracket Cover Aerodynamics
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Solution Overview
Problem
In straddle-type vehicles, the space below the front cowl allows traveling wind to enter and reduce the cooling effect on radiators and oil coolers, increasing air resistance and generating lift due to inadequate coverage by baffle plates or design constraints.
Innovation Solution
A straddle-type vehicle design featuring a shroud with an opening for the front fork and a lower bracket cover positioned below the opening to suppress wind entry into the front cowl, improving aerodynamics and cooling efficiency by covering the gap between the shroud and front fender.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large space is secured in the lower portion of the front cowl to enable the front fork to rotate, then the front fork can rotate relative to the front cowl with proper clearance, but traveling wind enters the front cowl through this space, reducing cooling effect and increasing air resistance
Solution Approach 1:
A wind redirecting member (baffle plate) is introduced as an intermediary element between the traveling wind and the front cowl interior. This baffle plate is positioned to intercept wind that would otherwise enter through the lower portion space, redirecting it toward the radiator while maintaining the necessary rotation space for the front fork.
Solution Approach 2:
The front cowl structure is modified with localized additions - specifically a wind redirecting member positioned at the lower portion and a covering member at the front end. These local modifications address the wind entry problem without altering the overall structure or reducing the rotation space.
2Object-affected harmful factors
If a baffle plate is attached to the bottom bridge to suppress wind entry, then wind entry is reduced, but the gap between the baffle plate and under cover portion remains large when the distance between bottom bridge and under cover is large, reducing effectiveness
Solution Approach 1:
The solution extends the wind suppression approach to multiple dimensions: the wind redirecting member addresses the vertical dimension by redirecting wind downward, while the covering member addresses the horizontal dimension by sealing the front end opening. This multi-dimensional approach ensures effectiveness regardless of the vertical distance between components.
Solution Approach 2:
The wind suppression function is divided into two separate components: a wind redirecting member (baffle plate) that handles wind redirection, and a covering member that handles front end sealing. This segmentation allows each component to be optimized independently for its specific function, ensuring overall effectiveness.
3Object-affected harmful factors
If the distance between the bottom bridge and under cover portion is extremely small, then wind entry is suppressed, but there is insufficient space to dispose the baffle plate between them
Solution Approach 1:
When vertical space is constrained, the solution utilizes the horizontal dimension by introducing a covering member that extends forward from the lower bracket to seal the front end opening. This allows wind suppression without requiring vertical clearance for a traditional baffle plate.
4Object-affected harmful factors
If the front cowl covers the periphery of the headlamp to the front side of the fuel tank, then aerodynamic performance is improved, but the space for front fork rotation is reduced
Solution Approach 1:
The front cowl is designed with localized openings and modifications at critical areas - specifically at the lower portion where the front fork rotates and at the front end where wind enters. These local modifications maintain overall aerodynamic performance while providing necessary clearance for mechanical operations.
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 air resistance, prevents lift generation, and enhances the cooling effect on radiators and oil coolers by ensuring that traveling wind does not enter the front cowl through the space where the front fork passes, thereby improving the vehicle's aerodynamic performance.
Implementation Method 1
the traveling wind passes between the front cowl and a front fender, and blows against the radiator or an oil cooler... A shroud 21... covering a lower portion of the front cowl... A lower bracket cover 31... covering the lower bracket from below
Data Source
AI summary
There is provided a straddle-type vehicle including: a head pipe; a steering stem rotatably supported in the head pipe; a front fork; an upper bracket connecting an upper end portion of the front fork to the steering stem; a lower bracket located below the upper bracket and connecting an upper portion of the front fork to the steering stem; a front wheel supported by a lower end portion of the front fork; a front fender covering the front wheel from above; a front cowl covering an upper front portion of the straddle-type vehicle; a shroud located above the front fender and covering a lower portion of the front cowl; and a lower bracket cover located above the front fender and covering the lower bracket from below. The shroud has an opening through which the front fork passes. The lower bracket cover is provided below the opening.