Wheel-Powered Tire Inflation With Pumping and Freewheeling Modes
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Solution Overview
Problem
Existing tire inflation systems are inefficient and prone to wear due to undesired spin conditions, require complex plumbing, and are not adaptable to real-time tire pressure adjustments, leading to reduced vehicle fuel efficiency and tire longevity.
Innovation Solution
A tire-mounted system that utilizes a drive mechanism with an eccentric mass and torque regulation mechanism to transition between pumping and freewheeling modes, enabling controlled tire inflation and reducing wear by harvesting energy from wheel rotation, with components distributed at each wheel for independent pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional tire inflation system is used, then tire pressure can be maintained, but the system is inefficient and prone to wear due to undesired spin conditions
Solution Approach 1:
The system dynamically transitions between pumping mode and freewheeling mode based on operating conditions. The drive mechanism includes a pumping element that can rotate in both directions, allowing the system to adapt its operation to minimize wear and maximize efficiency under varying wheel speeds and tire pressure requirements
Solution Approach 2:
The system harvests energy from wheel rotation through the drive mechanism, converting rotational motion into pumping action without requiring an external power source. The inertial element stores and releases energy to maintain pumping action during both acceleration and deceleration phases of wheel rotation
2Reliability
If a complex plumbing system is used for tire inflation, then pressure control is achieved, but the device complexity increases
Solution Approach 1:
The system is divided into modular components: a drive mechanism with inertial element, a pumping element with seals, and a valve assembly. Each component performs a specific function and can be independently maintained or replaced, reducing overall system complexity while maintaining reliable pressure control
Solution Approach 2:
The drive mechanism serves multiple functions: it drives the pumping element, harvests energy from wheel rotation, and controls fluid flow direction through reversible rotation. The pumping element alternates between intake and compression strokes, eliminating the need for separate valves for each function
3Adaptability or versatility
If fixed tire pressure is maintained, then tire longevity is extended, but the system cannot adapt to real-time road and environmental conditions
Solution Approach 1:
The system performs periodic pumping actions synchronized with wheel rotation through the inertial element's oscillation. The pumping element alternates between intake and compression strokes at each rotation cycle, providing continuous pressure adjustment without requiring continuous energy input
Solution Approach 2:
The system adjusts tire pressure by changing the timing and duration of pumping actions rather than increasing power consumption. The control system modulates the drive mechanism's operation to deliver precise pressure adjustments adapted to road conditions, temperature, and load variations
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 provides efficient, on-demand tire inflation, reduces wear on components, enhances vehicle fuel efficiency, and extends tire life by maintaining optimal tire pressure based on road and environmental conditions, while minimizing the risk of pressure system failure.
Implementation Method 1
the inertial element retains an angular position of the drive mechanism relative to a gravity vector when the wheel rotates
Implementation Method 2
a cam of the drive mechanism translates rotation of the wheel into reciprocating linear motion that drives a pumping element
Data Source
AI summary
A system for tire inflation including a drive mechanism defining a rotational axis, including an eccentric mass that offsets a center of mass of the drive mechanism from the rotational axis along a radial vector; a pump arranged radially distal the rotational axis of the drive mechanism, including a chamber defining a chamber lumen, and a reciprocating element arranged at least partially within the chamber lumen and translatable along a pump axis; a drive coupler coupled between the drive mechanism at a first position and the reciprocating element at a second position fixed to the reciprocating element; a torque regulation mechanism; and a controller, communicatively coupled to the torque regulation mechanism; wherein the system is operable between at least a first mode and a second mode by the torque regulation mechanism in cooperation with the controller.