Vehicle Wheel Sub-Air Chamber Joint Axis Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Stress concentration occurs at the joint sites of sub-air chamber members in vehicle wheels due to centrifugal force, compromising both durability and sound deadening performance.
Innovation Solution
The sub-air chamber member is designed with joint points situated on the strong axis of the principal axes of an axially perpendicular section, and the mass distribution of the upper and lower surface portions is made uniform to minimize stress concentration, enhancing both durability and sound deadening performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sub-air chamber member is provided with upper projecting portions and lower projecting portions joined at their bottom portions, then sound deadening performance is improved, but stress concentration occurs at the joint sites
Solution Approach 1:
The patent applies asymmetry by positioning the joint portions not at the symmetric center but specifically on the strong axis (PA1) of the principal axes of the axially perpendicular section. This asymmetric positioning on the strong axis allows the joint portions to align with the maximum moment of inertia direction, thereby reducing stress concentration while maintaining sound deadening performance through the projecting portions configuration
2Ease of manufacture
If the joint portions are formed by recessing toward the inside of the sub-air chamber, then manufacturing ease is improved, but stress concentration occurs at the joint portions
Solution Approach 1:
The patent applies local quality by making the joint portions recessed locally toward the inside of the sub-air chamber rather than uniformly throughout. This localized recessing is specifically positioned on the strong axis (PA1) and between the first and second edge portions, allowing easy manufacturing through localized material removal while the specific positioning on the strong axis ensures reduced stress concentration
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
This design effectively reduces stress concentration at the joint portions, improving the vehicle wheel's strength and sound deadening performance by balancing durability and sound absorption.
Implementation Method 1
To reduce road noise caused by pipe resonance in a tire air chamber, various wheels have been conventionally proposed which are provided with Helmholtz resonators (sub-air chamber members) each having a sub-air chamber that communicates with the tire air chamber via a communication hole.
Implementation Method 2
When centrifugal force acts on the sub-air chamber member due to the rotational movement of the wheel, the maximum stress is generated at the sites where the upper projecting portions and the lower projecting portions are joined to each other
Data Source
AI summary
An auxiliary air chamber member includes: a lower surface arranged on the outer circumferential surface side of a well section; an upper surface arranged outward from the lower surface; an auxiliary air chamber formed between the upper surface and the lower surface; a pair of edges that join the lower surface and the upper surface on both sides in the width direction and that engage with the well section; and a plurality of joining sections that partially join the upper surface and the lower surface as a result of being sunk into the interior of the auxiliary air chamber from the upper surface and the lower surface between one edge and the other edge along the wheel width direction Y. The joining points of the individual joining sections are arranged on the strong axis of the cross-sectional main axis of the auxiliary air chamber member in an axial right section.