Self-Inflating Tire Pressure Regulator with Flexible Diaphragm
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Solution Overview
Problem
Tire pressure naturally decreases over time, requiring frequent driver intervention to maintain optimal pressure, which affects fuel economy, tire life, and vehicle handling.
Innovation Solution
A self-inflating tire assembly with a pump mechanism and pressure regulator, featuring flexible air passageways and a regulator device with a pressure membrane that opens and closes to control air flow, allowing the tire to self-inflate by utilizing outside air when pressure falls below a preset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a self-inflating tire system is implemented, then driver intervention is eliminated and tire pressure is maintained automatically, but device complexity increases due to additional pump and regulator components
Solution Approach 1:
The tire system automatically monitors its own pressure and activates the pump when pressure drops below the threshold, eliminating the need for driver monitoring and manual inflation. The system serves itself by using the tire's rotation to drive the pump mechanism and the pressure differential to control the regulator valve.
Solution Approach 2:
The system uses pneumatic principles throughout: the pump uses tire rotation to compress and move air, the regulator uses pressure differential to control valve opening, and the flexible diaphragm responds to pressure changes to modulate airflow. All control mechanisms are purely pneumatic with no electrical or mechanical linkages.
2Reliability
If continuous tire pressure monitoring and automatic inflation is implemented, then optimal tire pressure is maintained improving fuel economy and tire life, but energy consumption increases due to pump operation
Solution Approach 1:
The pump operates periodically rather than continuously, activating only when the tire pressure drops below the predetermined threshold. The system monitors pressure continuously but performs inflation in periodic cycles, reducing overall energy consumption while maintaining reliable pressure levels.
Solution Approach 2:
The regulator valve dynamically adjusts its opening based on the real-time pressure differential between inside and outside the tire. As pressure equalizes during inflation, the valve automatically closes, optimizing energy usage by stopping airflow before over-inflation occurs.
3Manufacturing precision
If a pressure regulator with flexible diaphragm is used, then precise pressure control is achieved, but manufacturing complexity increases due to multiple flexible components
Solution Approach 1:
The regulator uses a flexible diaphragm made of elastomeric material that responds to pressure differential to control valve opening. This flexible film replaces complex mechanical linkages and provides precise, reliable pressure control through its elastic deformation characteristics.
Solution Approach 2:
The regulator assembly combines rigid components (valve body, spring) with flexible components (diaphragm made of elastomeric material) to create a composite structure that leverages the advantages of both material types: structural integrity from rigid parts and responsive pressure sensing from flexible materials.
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 system maintains optimal tire pressure without driver intervention, enhancing fuel efficiency, tire longevity, and vehicle performance by automatically inflating the tire as needed.
Implementation Method 1
The flexible diaphragm responds to a pressure differential to open or close an outlet port mounted in the interior chamber
Implementation Method 2
each air passageway being composed of a flexible material operative to open and close when the tire rotates
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A self-inflating tire (12) is disclosed having a tire cavity (40), first and second sidewalls (15) extending respectively from first and second tire bead regions to a tire tread region and a first and second air passageway (43, 44) each having an inlet end (42, 48) and an outlet end (46, 52), each air passageway outlet end (46, 52) being in fluid communication with the tire cavity (40). The tire (12) further comprises a regulator device (300) having a regulator body (310) having an interior chamber (320) and a pressure membrane (550) mounted on the regulator device (300). The regulator body (310) has a first, second and third, preferably flexible duct (350, 360, 370), wherein the first, second and third ducts (350, 360, 370) each have an internal passageway (352, 362, 372), wherein the third, preferably flexible duct (370) has a first end in fluid communication with the outside air and a second end in fluid communication with the interior chamber (320) of the regulator device (300), wherein the first, preferably flexible duct (350) has a first end (354) in fluid communication with the inlet end (42) of the first air passageway (43), and a second end in fluid communication with the outlet port (330) of the regulator device (300), and wherein the second, preferably flexible duct (370) has a first end in fluid communication with the inlet end (48) of the second air passageway (44) and a second end in fluid communication with the outlet port (330) of the regulator device (300).