Roll Over Valve With Variable Inlet Tubes
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Solution Overview
Problem
The existing single-type roll over valve for fuel tanks limits the internal volume available for fuel due to its clog point, restricting the fuel filling capacity, especially when a larger capacity tank is needed to accommodate adjacent vehicle components.
Innovation Solution
A single-type roll over valve with multiple oil surface variable fuel inflow tubes mounted on the inlet, allowing the clog point to be adjusted, mimicking the effect of a dual-type roll over valve by varying the fuel inlet configuration, thereby increasing the fuel filling capacity without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-type roll over valve is used, then the structure is simple and manufacturing cost is low, but the fuel filling capacity is limited due to the clog point
Solution Approach 1:
The single fuel inlet is divided into multiple fuel inlets (first fuel inlet and second fuel inlet) with different heights. This segmentation allows the valve to create multiple clog points at different levels, effectively increasing the fuel filling capacity while maintaining the simplicity of a single valve structure, thus resolving the contradiction between manufacturing simplicity and fuel capacity.
Solution Approach 2:
The patent introduces a vertical height dimension by positioning fuel inlets at different heights within the valve body. This dimensional approach creates multiple clog points at different elevation levels, allowing the tank to be filled to a higher level before the float triggers fuel cutoff, thereby increasing fuel capacity without adding multiple separate valves.
2Quantity of substance
If the fuel tank capacity is increased to accommodate more fuel, then the fuel filling capacity improves, but the mounting space for adjacent components is reduced
Solution Approach 1:
The patent changes the parameters of the roll over valve by introducing multiple fuel inlets at different heights with different diameters. This parameter modification allows the valve to control fuel flow and create clog points at different levels, increasing the effective fuel filling capacity within the same tank volume without encroaching on mounting space for adjacent components.
3Quantity of substance
If multiple roll over valves are mounted to increase fuel capacity, then the fuel filling capacity improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the functions of multiple roll over valves into a single integrated valve structure. By incorporating multiple fuel inlets at different heights within one valve body, the design achieves the fuel capacity benefits of multiple valves while reducing component count, simplifying the overall system, and lowering manufacturing costs.
Solution Approach 2:
The single roll over valve is designed to perform multiple functions: it controls fuel flow through multiple inlets at different heights, creates multiple clog points, and manages evaporation gas discharge. This multi-functionality eliminates the need for separate valves, reducing device complexity while maintaining enhanced fuel filling capacity.
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 adjusted clog point allows for a higher fuel filling capacity in the same volume tank, reducing the available space where fuel can be filled when the float plugs up the orifice, effectively matching the performance of a dual-type roll over valve without the increased manufacturing costs.
Implementation Method 1
when the fuel in the fuel tank is filled above the float 20 and the buoyancy is applied to the float 20, the float 20 rises to allow a cut-off protrusion 22 of the float 20 to plug up the orifice 16
Implementation Method 2
the evaporation gas evaporated from the fuel enters the inlet 14 of the housing 10 and passes through a gap between an inner wall of the housing 10 and the float 20
Data Source
AI summary
A roll over valve for a fuel tank of a vehicle may include a plurality of oil surface variable fuel inflow tubes mounted on an inlet through which fuel is introduced into a float of a single type roll over valve mounted on the fuel tank.