Self-Inflating Tire Assembly Peristaltic Pump Mechanism
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Solution Overview
Problem
Tire pressure naturally decreases over time, requiring frequent driver intervention to maintain recommended levels, which affects fuel economy, tire life, and vehicle performance.
Innovation Solution
A self-inflating tire assembly with a peristaltic pump mechanism featuring a flexible air tube with one-way check valves and diaphragm chambers that compress and decompress to pump air into the tire, maintaining pressure without driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a self-inflating mechanism is incorporated into the tire, then driver intervention is eliminated and tire pressure is automatically maintained, but device complexity increases due to additional components
Solution Approach 1:
The tire assembly performs self-inflation by utilizing the rotation of the tire itself to drive the pump mechanism. The flexible air tube is positioned such that the tire footprint compresses it during rotation, automatically pumping air into the tire without any external power source or driver intervention.
Solution Approach 2:
The invention uses pneumatic principles by employing a flexible air tube that is compressed by the tire footprint to pump air through one-way check valves into the tire. The system utilizes air pressure differentials created during tire rotation to drive the inflation process.
2Ease of operation
If the air tube is made flexible to allow flattening by tire footprint, then the pump mechanism can operate during tire rotation, but the structural strength of the air tube must be sufficient to withstand compression and return to original shape
Solution Approach 1:
The air tube is constructed from flexible material that can be compressed by the tire footprint during rotation and then resiliently returns to its unflattened condition. This flexibility enables the tube to be sequentially compressed as the tire rotates, driving the pump action while maintaining structural integrity.
Solution Approach 2:
The air tube transitions dynamically between flattened and unflattened states as the tire rotates. The tube is designed to be compressed only when positioned within the tire footprint and to return to its original shape when repositioned outside the footprint, creating a cyclic pumping action.
3Reliability
If one-way check valves are installed between diaphragm segments, then air flows in only one direction to build pressure, but the valve complexity increases compared to open passageways
Solution Approach 1:
The one-way check valve is integrated directly into the wall between adjacent diaphragm segments, extracting the valve function from a separate component and incorporating it into the tube structure itself. This reduces overall system complexity while maintaining unidirectional flow control.
Solution Approach 2:
The one-way check valve acts as an intermediary element that allows air to pass in one direction (from inlet to outlet) while blocking reverse flow. This enables reliable pressure buildup in the tire by ensuring air flows only toward the tire cavity and not back toward the inlet.
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 effectively maintains tire pressure, enhancing fuel efficiency, tire longevity, and vehicle handling by automatically compensating for pressure losses during tire rotation.
Implementation Method 1
The tire footprint in a rotating tire being operative to sequentially compress the diaphragm chambers to pump air through the one-way valve between the diaphragm chambers and along the air passageway
Implementation Method 2
The flattened tube segments resiliently return to an un-flattened condition when repositioned by tire rotation outside the tire tread footprint
Implementation Method 3
The one-way valve allows a directional passage of air through the valve from an inlet valve side an outlet valve side
Data Source
AI summary
A self-inflating tire assembly includes one or more air tube(s) connected to a tire and having a plurality of adjoining diaphragm chambers separated by a one-way valve. An air passageway extends through the air tube and the diaphragm chambers. The one-way valve allows a directional passage of air through the valve from an inlet valve side an outlet valve side. The footprint in a rotating tire sequentially collapses the diaphragm chambers to directionally pump air through the one-way valve between the diaphragm chambers and along the air passageway from an air tube inlet device to an air tube outlet device.