Opaque Fuel Tank Level Indicator Using Pivot Arm
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Solution Overview
Problem
Existing fuel level indicators for riding lawn equipment are either expensive or inaccurate, particularly when the fuel tank is opaque, as they require translucent materials or costly electronic sensors to provide a reasonable fuel level indication.
Innovation Solution
A pivotable fuel level indicator arm system that contacts the underside of an opaque fuel tank and extends through the operator seat opening, using tension springs to support the tank and rotate the arm based on fuel weight changes, with markings to indicate the fuel level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If translucent plastic material is used for the fuel tank, then fuel level visibility is improved, but permeation resistance deteriorates
Solution Approach 1:
A mechanical indicator arm serves as an intermediary between the fuel tank's internal fuel level and the operator's visual observation. The arm contacts the tank externally and translates fuel weight changes into positional changes that indicate fuel level, eliminating the need for direct visual penetration of the tank wall.
Solution Approach 2:
The patent replaces optical observation methods (looking through translucent tank walls) with a mechanical indication system. The indicator arm mechanically responds to fuel weight changes and provides visual feedback through its position relative to marked positions, substituting direct optical access with mechanical-translated visual information.
2Measurement precision
If electronic fuel sensors are used, then fuel level measurement precision is improved, but device cost deteriorates
Solution Approach 1:
The patent employs simple, inexpensive mechanical components (an indicator arm and spring mechanism) instead of expensive electronic sensors. The system uses basic mechanical elements that can be manufactured at low cost while still providing adequate fuel level indication for the application.
Solution Approach 2:
The fuel tank itself serves the dual function of storing fuel and providing weight information through its interaction with the indicator arm. The tank's weight changes due to fuel consumption directly drive the indicator mechanism, eliminating the need for separate sensing systems.
3Loss of information
If float sensors are used inside the fuel tank, then fuel level indication is improved, but device complexity and cost deteriorate
Solution Approach 1:
The indication mechanism is extracted from inside the fuel tank and positioned externally. The indicator arm contacts the tank from the outside, eliminating the need for internal float sensors and their associated complexity. Only a simple external mechanical link is required to translate tank weight changes into readable indications.
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 provides a cost-effective and accurate fuel level indication for opaque fuel tanks, allowing operators to easily determine the fuel level without the need for expensive sensors or translucent materials.
Implementation Method 1
A pair of springs are in tension between the tank and the plates, to partially support the tank
Implementation Method 2
The changing fuel weight in the tank, due to fuel consumed during use, along with the spring force, will cause the front of the fuel tank to move up and down vertically
Implementation Method 3
A pivotable fuel level indicator arm has a first end contacting the underside of the tank and a second end extending from the underside of the tank around the front of the tank
Data Source
AI summary
A fuel level indicator for riding lawn equipment with a fuel tank pivotably mounted under the operator seat. A fuel level indicator arm is pivotably mounted under the fuel tank and has a first end contacting the fuel tank and a second end extending through an opening in front of the operator seat. A scale on the opening indicates the fuel level corresponding to the location of the second end of the fuel level indicator arm. A pair of tension springs are attached to the fuel tank and partially support the fuel tank.