Torsion Bar Serrated End Symmetry Steering Assembly

The patent applies preliminary action by forming the serrated portion with controlled symmetry during the initial rolling process. The rolling dies are designed to create symmetrical material distribution at the end region before installation, preventing twisting during press-fitting. This preliminary correction eliminates the need for secondary grinding operations while maintaining manufacturing efficiency.

The patent applies local quality by creating a serrated portion with distinct geometric features at the end region of the torsion bar. The serrations are formed with controlled symmetry specifically at this local area, while the main body of the torsion bar maintains its original properties. This localized modification addresses the symmetry issue without requiring rework of the entire component.

The patent performs the symmetry correction during the initial rolling process itself, rather than requiring subsequent removal of material. The rolling dies are configured to produce symmetrical end regions with controlled material distribution, eliminating the need for expensive and time-consuming grinding operations while achieving the required precision.

The patent replaces expensive secondary grinding processes with a cost-effective rolling operation. By integrating the symmetry control into the primary forming process using appropriately designed rolling dies, the patent eliminates the need for costly secondary machining operations, significantly reducing manufacturing costs and time.

The patent applies preliminary action by pre-forming the serrated portion with controlled symmetry during the rolling process. This ensures that when the torsion bar is pressed into the steering shaft, the symmetrical geometry prevents twisting and allows proper centering to occur naturally during assembly, eliminating the need for subsequent alignment adjustments.

The patent addresses the asymmetry problem by intentionally creating a symmetrical serrated portion through controlled rolling. The serrations are formed with equal distribution around the circumference, counteracting the inherent asymmetry that would otherwise cause twisting during press-fitting. This deliberate symmetry in the end region geometry ensures proper centering during assembly.