Automobile Wheel Spoke Rigidity via Inclined Threads
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Solution Overview
Problem
The existing two-piece automobile wheel design lacks rigidity balance due to reduced rigidity on the distal end side of the spoke portions, which affects the overall structural integrity and can lead to interference with braking devices.
Innovation Solution
The design incorporates spoke portions with a center valley and projecting threads that have a narrower separation distance on the distal end side, an inclined surface portion with a larger length and gentler downward inclination angle on the distal end side, and a disc flange positioned on the wheel axially front side to enhance rigidity and avoid interference with braking devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the distal end of the spoke portion is folded to the wheel axially back side to be connected to the disc flange portion, then the spoke portion can be connected to the disc flange portion, but the rigidity on the distal end side is reduced compared to the proximal end side
Solution Approach 1:
The spoke projecting threads are designed with non-uniform characteristics along the radial direction. Specifically, the separation distance between adjacent spoke projecting threads is smaller on the distal end side compared to the proximal end side. This local variation in thread spacing creates enhanced rigidity precisely where needed (at the distal end connection point) while maintaining the overall structural integrity of the spoke portion.
2Shape
If the separation distance between tops of the spoke projecting threads is narrower on the spoke distal end side, then the design aesthetic is improved, but the rigidity on the distal end side is reduced
Solution Approach 1:
The spoke projecting threads are designed with non-uniform characteristics along the radial direction. Specifically, the separation distance between adjacent spoke projecting threads is smaller on the distal end side compared to the proximal end side. This local variation in thread spacing creates enhanced rigidity precisely where needed (at the distal end connection point) while maintaining the overall structural integrity of the spoke portion.
Data Source
AI summary
Each spoke portion (50) includes a center valley portion (51), and spoke projecting threads (52) formed on both sides of the center valley portion (51). Each of the spoke projecting threads (52) includes an inclined surface portion (54), which protrudes outward in a spoke widthwise direction from a top (53) and inclines downward to a wheel axially back side. The inclined surface portion (54) is formed so that a length thereof in a range of from the top (53) to an outer end of the inclined surface portion (54) in the spoke widthwise direction becomes larger toward a spoke distal end side, and that an average downward inclination angle thereof becomes smaller toward the spoke distal end side. With this configuration, it is possible to increase rigidity of the spoke portion with good balance while avoiding interference with a braking device.