Tire Wheel Assembly Barycentric Position Adjustment
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Solution Overview
Problem
The existing tire/wheel assemblies require separate manufacturing and management of two types of wheels, one with and one without an air pressure detecting unit, leading to increased costs and complexity due to unbalance issues when the unit is mounted or not mounted.
Innovation Solution
A tire/wheel assembly design where the target barycentric position is adjusted to deviate towards or away from the unit installation position based on its presence, allowing for a single type of wheel assembly to be used with optimized unbalance and unbalance range, reducing the maximum balance weight required for rotational adjustments by half the weight of the detecting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If counterbalance weight equivalent to the air pressure detecting unit weight is provided to the wheel, then the target barycentric position conforms to the rotation center when the unit is mounted, but the maximum balance weight required increases when the unit is not mounted
Solution Approach 1:
The patent applies dynamics by making the target barycentric position adjustable based on whether the air pressure detecting unit is mounted. The system dynamically switches between two target positions: one that conforms to the rotation center when the unit is mounted, and another that is shifted by half the unit's weight when the unit is not mounted. This dynamic adjustment resolves the contradiction by adapting the balance target to the actual mounting state, eliminating the need for excessive balance weights.
Solution Approach 2:
The patent changes the parameter of target barycentric position based on the mounting state of the air pressure detecting unit. When the unit is not mounted, the target position is shifted by half the unit's weight in the opposite direction of where the unit would be installed. This parameter change allows the system to maintain optimal balance performance in both mounted and unmounted states without requiring excessive balance weights.
2Weight of moving object
If no counterbalance weight equivalent to the air pressure detecting unit weight is provided, then the maximum balance weight is reduced, but two kinds of wheels must be manufactured and managed
Solution Approach 1:
The patent applies universality by designing a single wheel type that can function optimally in both mounted and unmounted states. By incorporating an adjustable target barycentric position feature into the wheel design, the same wheel can accommodate either the air pressure detecting unit or operate without it, eliminating the need to manufacture and manage two separate wheel types while maintaining balance performance in both scenarios.
3Manufacturing precision
If the target barycentric position is set to deviate toward the unit installation position when equipped, then unbalance amount is optimized with the unit, but the unbalance range increases when the unit is not equipped
Solution Approach 1:
The patent applies dynamics by making the target barycentric position switchable between two states: when the air pressure detecting unit is mounted, the target position deviates toward the installation position to optimize unbalance amount; when the unit is not mounted, the target position shifts to compensate for the missing weight. This dynamic positioning minimizes the unbalance range in both scenarios, preventing excessive deviation.
Solution Approach 2:
The patent applies preliminary anti-action by pre-calculating and pre-positioning the target barycentric position to compensate for the potential absence of the air pressure detecting unit. When the unit is not mounted, the target position is already shifted by half the unit's weight in the opposite direction of installation, preemptively counteracting the unbalance that would otherwise occur. This preliminary adjustment keeps the unbalance range minimized without requiring the unit to be present.
Data Source
AI summary
Tire/wheel assemblies that each include a wheel with an air valve mounted thereto and a tire mounted to the wheel, and can each be equipped with an air pressure detecting unit for detecting the air pressure of the tire. A weight balance of the wheel itself is set so that a target barycentric position of the tire/wheel assembly with the air pressure detecting unit deviates from a rotation center of the wheel toward an installation position of the unit by a predetermined amount, and so that a target barycentric position of the tire/wheel assembly without the air pressure detecting unit deviates from the rotation center of the wheel toward the side opposite to the unit installation position by a predetermined amount.