Propeller Shaft Front Flange Reinforcement for Bending Load Relief

The patent applies local quality by implementing a reinforcement web with specific geometric features (fillets, radii) at the critical front flange area where stress concentration occurs. The reinforcement web has varying thickness and curved transitions that locally enhance strength precisely where needed, rather than uniformly thickening the entire shaft. This localized structural modification addresses the high stress region without adding unnecessary weight elsewhere.

The patent employs curvature principles through filleted transitions and rounded corners at stress concentration points. The reinforcement web includes fillets with specific radii (e.g., R1, R2, R3) that create smooth curved transitions between different structural elements, eliminating sharp corners that would act as stress concentrators. This spherical/curved geometry distributes stress more evenly and prevents crack initiation.

The patent merges the reinforcement web with the existing front flange structure, creating an integrated component rather than a separate attachment. The reinforcement web extends from the front flange and merges with the shaft body, forming a unified structure that reduces stress concentration while avoiding the complexity of separate reinforcement components, fasteners, or assembly steps.

The reinforcement web serves multiple functions simultaneously: it strengthens the front flange area, provides stress distribution pathways, creates fluid flow communication channels through its perforations, and maintains structural continuity with the shaft body. This multi-functionality reduces the need for additional separate components.

The reinforcement web varies its thickness locally rather than being uniformly thick throughout. It is thicker at critical stress concentration points (such as where it merges with the front flange and shaft body) and thinner in less critical areas, optimizing strength-to-weight ratio by placing material only where structurally necessary.

The curved and filleted geometry of the reinforcement web allows for gradual thickness transitions that maintain structural integrity while minimizing material usage. The rounded transitions distribute stress more efficiently than sharp corners, allowing for thinner overall sections while maintaining equivalent or superior strength.