Vehicle Wheel Helmholtz Resonator Offset Protrusion Centrifugal Deformation
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Solution Overview
Problem
Conventional vehicle wheels with Helmholtz resonators experience deformation and reduced critical rotational speed due to centrifugal forces, leading to detachment of the sub air chamber member from the well portion, as the protruding portion with the communication hole is centrally located, increasing deformation and decreasing the wheel's critical rotational speed.
Innovation Solution
A vehicle wheel design with a sub air chamber member fixed to the outer circumferential surface, featuring a protruding portion offset towards an edge, integrated with an extending portion, and a communication hole with a longitudinal cross-sectional shape, which reduces deformation by increasing stiffness and preventing detachment, while allowing easy attachment and maintaining air tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the protruding portion with communication hole is arranged at the central position of the sub air chamber member, then the structure is simple and easy to manufacture, but the deformation under centrifugal force increases and critical rotational speed decreases
Solution Approach 1:
The protruding portion is repositioned from the central position to an offset position along the circumferential direction, creating an asymmetric arrangement that reduces the moment arm for centrifugal forces and thereby decreases deformation while maintaining manufacturing simplicity
2Reliability
If the protruding portion is arranged at the central portion of the sub air chamber member, then the structure is stable during attachment, but deformation under centrifugal force increases leading to detachment
Solution Approach 1:
Offsetting the protruding portion creates an asymmetric structure that reduces centrifugal deformation, while the attachment structure maintains reliability through the engagement of edge portions with standing wall surfaces and groove portions
3Reliability
If the communication hole is arranged at the middle position between both standing wall surfaces, then the air chamber communicates effectively with the tire air chamber, but the protruding portion experiences maximum deformation under centrifugal force
Solution Approach 1:
The communication hole is repositioned within the protruding portion that is offset from the center, creating an asymmetric arrangement that maintains air communication functionality while reducing the protruding portion's exposure to centrifugal deformation
Solution Approach 2:
The communication hole is given a longitudinal cross-sectional shape extending in the circumferential direction, utilizing the dimensional space within the offset protruding portion to maintain effective air communication while positioning the structure to minimize centrifugal deformation
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 design effectively prevents deformation of the sub air chamber member under centrifugal force, increasing the critical rotational speed and ensuring stable silencing functionality, while reducing weight and manufacturing costs through the use of resin materials.
Implementation Method 1
as a wheel that reduces the road noise caused by air column resonance in the air chamber of a tire, there are presented various wheels provided with Helmholtz resonators each having a sub air chamber communicating with the air chamber of a tire through a communication hole
Implementation Method 2
the deformation and reduced critical rotational speed due to centrifugal forces
Implementation Method 3
reduces deformation by increasing stiffness
Data Source
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AI summary
A vehicle wheel of the present invention, includes: a sub air chamber member which serves as a Helmholtz resonator and is fixed to an outer circumferential surface of a well portion in a tire air chamber; a first standing wall surface formed such as to stand from the outer circumferential surface of the well portion outward in radial direction and extend in circumferential direction of the outer circumferential surface; and a second standing wall surface formed on the well portion such as to face the first standing wall surface in width direction of the outer circumferential surface.