Fill-through Tire Pressure Indicator with Diaphragm
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Solution Overview
Problem
Existing tire pressure indicators lack the ability to allow air to pass through while providing a visual indication of pressure levels, leading to inconsistent and inaccurate readings, especially under high pressure, and do not allow for easy inflation or deflation without removal.
Innovation Solution
A pressure indicator with a free-moving diaphragm and a mirror for improved visibility, allowing air to pass through and providing a visual indication through a lens with three color bands for optimal, above, or below pressure levels, while being compact and reliable, and allowing tire inflation or deflation without removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional tire pressure indicator is mounted on a tire valve stem, then visual indication of pressure levels is provided, but air cannot pass through the device for inflation
Solution Approach 1:
The device is segmented into distinct functional zones: an upper sealed chamber containing the indicator mechanism, and a lower open section with a fill valve. This segmentation allows the indicator portion to remain sealed for reliable pressure sensing while the lower portion remains open for air passage during inflation, resolving the contradiction between indication reliability and inflation convenience.
Solution Approach 2:
A diaphragm acts as an intermediary element that separates the sealed indicator chamber from the open fill valve chamber while still allowing pressure transmission. The diaphragm enables the indicator to sense tire pressure reliably through the diaphragm's movement, while air can freely pass through the fill valve chamber during inflation, thus mediating between reliable indication and convenient inflation.
2Measurement precision
If a sealed indicator mechanism is used to provide reliable pressure readings, then measurement accuracy is improved, but the device becomes complex and air passage is blocked
Solution Approach 1:
The indicator mechanism is self-powered by tire pressure itself. The diaphragm responds automatically to pressure changes, moving the indicator without requiring external power sources, complex electronics, or additional components. This self-service approach achieves accurate pressure measurement while minimizing device complexity.
Solution Approach 2:
The device uses color-coded indicator bands (green, yellow, red) that are visually distinct and require no complex display mechanisms. This simple color-change indication method provides accurate pressure level measurement while keeping the device structure simple and easy to understand.
3Ease of operation
If color-coding is used to indicate pressure levels, then ease of determination is improved, but visibility in poor lighting conditions deteriorates
Solution Approach 1:
The device employs three distinct color bands (green for proper pressure, yellow for intermediate, red for improper pressure) that provide clear visual differentiation. These colors are chosen for their high contrast and visibility characteristics, making pressure level determination easy even in varying lighting conditions.
Solution Approach 2:
The indicator uses the vertical dimension with the diaphragm moving up and down to display different color bands at different heights. This vertical arrangement of colors provides clear spatial separation between pressure levels, enhancing visibility and ease of determination regardless of lighting conditions.
4Volume of moving object
If a compact indicator design is used, then device size is reduced, but the indicator mechanism becomes inaccurate under high pressure
Solution Approach 1:
The diaphragm is designed as a dynamic, flexible element that can respond to a wide range of pressure levels. Its flexibility allows it to accurately indicate high pressures within a compact design, as the diaphragm's movement range accommodates varying pressure conditions without requiring a large physical structure.
Solution Approach 2:
The indicator mechanism is designed to maintain accuracy across different pressure parameters. The diaphragm's physical properties and the indicator scale are calibrated to provide accurate readings across the full pressure range, allowing compact design without sacrificing measurement precision under high pressure conditions.
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
Enables easy and accurate tire pressure monitoring and maintenance, improving safety, reducing premature tire wear, fuel consumption, and compliance with regulations by providing a reliable and compact solution for tire pressure management.
Implementation Method 1
A pressure indicator with a free-moving diaphragm and a mirror for improved visibility, allowing air to pass through and providing a visual indication through a lens with three color bands
Implementation Method 2
A pressure indicator with a free-moving diaphragm and a mirror for improved visibility
Data Source
AI summary
A tire pressure indicator that is combined with a fill valve. The indicator and the fill valve are coaxial or concentric. The invention may be screwed onto a tire valve stem. The indicator has three bands or sections, each of which is a different color, for indicating whether tire pressure is within a predetermined range, above that range, or below that range. The colors are viewed through a lens, aided by a mirror. A diaphragm pushes the indicator up when pressure rises, while a spring pushes the indicator down when pressure drops. A tire may be inflated or deflated while the invention is mounted on a tire stem. During inflation, the pin in an air chuck at the end of an air hose may depress a valve pin assembly to open the fill valve. A user may deflate the tire by manually depressing the valve pin assembly to release air.