Fuel Supply Device Float Rotation to Prevent Bottom Wall Damage
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Solution Overview
Problem
Existing fuel supply devices risk damaging the surface level detection unit and stopper during insertion into a fuel tank due to interference with the bottom wall surface, especially when the fuel level is low, leading to potential damage before the device is even used.
Innovation Solution
The fuel supply device incorporates a surface level detection unit with a float that is designed to rotate upward when contacting the bottom wall, limiting its displacement and avoiding strong urges against the stopper, by positioning the distal end part of the surface level detection unit above the imaginary rotational center axis and center of gravity, ensuring it rotates away from the stopper's limiting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotational range of the surface level detection unit includes the inserting direction to enable proper installation, then the device can be properly installed in the fuel tank, but the float may contact the bottom wall surface during insertion and cause damage to the surface level detection unit and stopper
Solution Approach 1:
The patent applies preliminary anti-action by pre-positioning the surface level detection unit at a specific angle during installation. The detection unit is set at an angle of 45 degrees or more relative to the inserting direction, which prevents the float from contacting the bottom wall surface during insertion. This preliminary angular positioning counteracts the potential harmful contact before it can occur, allowing both proper installation and damage prevention.
2Measurement precision
If the float is designed with larger volume at the lower side to receive buoyancy and follow the fuel surface level near the bottom wall, then the detection accuracy is improved, but the float exerts stronger force against the stopper when contacting the bottom wall surface
Solution Approach 1:
The patent applies preliminary anti-action by pre-positioning the surface level detection unit at a specific angle during installation. The detection unit is set at an angle of 45 degrees or more relative to the inserting direction, which prevents the float from contacting the bottom wall surface during insertion. This preliminary angular positioning counteracts the potential harmful contact before it can occur, allowing both proper installation and damage prevention.
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 design effectively prevents damage to the surface level detection unit and stopper during insertion by allowing the unit to rotate upward when encountering the bottom wall, thus avoiding strong contact and potential damage, ensuring the device functions correctly without pre-use damage.
Implementation Method 1
a float 60, which is configured to float on the fuel 9
Data Source
AI summary
A fuel supply device includes a surface level detection device that detects a surface level of fuel through use of a float. A supply main body is placed in a fuel tank through an insertion opening and supplies the fuel to an outside. A surface level detection unit, which includes the float, is rotatable relative to the supply main body, and a rotational range of the surface level detection unit is set to include at least an inserting direction of the supply main body. A distal end part of the surface level detection unit, which is furthermost from an imaginary rotational center axis in the surface level detection unit, is placed on an upper side of an imaginary plane, which includes the imaginary rotational center axis and a center of gravity of the surface level detection unit, in a rotational direction of the surface level detection unit.