Flush-Mount Fuel Cap Valve Positioning for Liquid Ingress Prevention
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Solution Overview
Problem
Motorcycle fuel caps with check valves positioned near the top face challenges in preventing liquid runoff, such as rain, from entering the fuel tank while allowing airflow for fuel replacement, as existing designs often rely on drip edges that may not effectively barrier liquids from reaching the check valve.
Innovation Solution
A fuel cap design featuring a flush-mount configuration with a valve positioned below the fuel tank's upper surface, incorporating a retractable portion and cap cover that aligns with the tank's contour, and a tortuous passageway to direct airflow through a one-way valve, preventing liquid ingress while allowing air replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If check valves are positioned near the top of the fuel cap, then airflow can be drawn to replace used fuel volume, but liquid runoff (e.g., rain) may enter the fuel tank with the airflow
Solution Approach 1:
The patent positions the check valve below the upper surface of the fuel tank, changing the vertical dimension of valve placement. This dimensional change allows the valve to remain accessible for airflow while being protected from liquid runoff by the tank's upper surface, which acts as a natural barrier.
Solution Approach 2:
The patent introduces a movable portion with a tortuous passageway as an intermediary between the external environment and the check valve. This passageway directs airflow to the valve while preventing liquid runoff from reaching it, serving as a mediator that separates the beneficial airflow function from the harmful liquid ingress.
2Object-affected harmful factors
If drip edges are added to prevent liquid runoff, then liquid barrier function is improved, but device complexity increases
Solution Approach 1:
The patent makes the upper surface of the fuel tank serve multiple functions: it acts as both the fuel tank cover and a liquid barrier (drip edge). By utilizing the existing tank structure for dual purposes, the invention prevents liquid runoff without adding separate drip edge components, thereby maintaining simplicity while achieving liquid protection.
3Object-affected harmful factors
If valve is positioned below the upper surface of the fuel tank, then liquid runoff prevention is improved, but airflow path complexity increases
Solution Approach 1:
The patent incorporates a movable portion that can move along the central axis of the fuel cap. This dynamic component creates a tortuous passageway that adapts to provide both liquid protection and airflow functionality. The movable nature of this portion allows the system to maintain liquid barrier integrity while enabling sufficient airflow to the check valve.
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 design effectively prevents liquid runoff from entering the fuel tank while ensuring airflow for fuel replacement, maintaining a seamless integration with the tank's surface and enhancing the sealing mechanism to prevent liquid entry.
Implementation Method 1
The fuel cap also includes a valve coupled to the body portion. The valve selectively allows an airflow through the body portion.
Implementation Method 2
The fuel cap further includes a tortuous passageway through which the airflow must pass before reaching the valve.
Data Source
AI summary
The present invention provides a fuel cap adapted to close an inlet of a fuel tank. The fuel cap includes a body portion adapted to engage the inlet of the fuel tank. The body portion defines a central axis. The fuel cap also includes a valve coupled to the body portion. The valve selectively allows an airflow through the body portion. The fuel cap further includes a cap cover coupled to the body portion and movable along the central axis relative to the body portion.