Asymmetrical Plastic Spindle Nut for Higher Axial Load Capacity

The patent applies asymmetry by designing the internal thread with a non-symmetrical profile where the engagement surface area between the spindle nut and spindle is optimized. The thread flanks are designed with different angles and contact areas to maximize load distribution and engagement, thereby increasing load capacity while maintaining manufacturability through standard threading processes.

The patent applies local quality by concentrating the increased profile sectional area specifically in the thread engagement zones where loads are transmitted, rather than uniformly increasing the entire spindle nut volume. The thread design features localized material distribution with enhanced engagement surfaces at critical load-bearing positions while maintaining a compact overall nut geometry.

The patent applies composite materials by using fiber-reinforced plastic materials for the spindle nut, combining plastic matrix with reinforcing fibers (such as glass, carbon, or aramid fibers). This composite structure provides both the maintenance-free advantage of plastic and the enhanced strength and durability required for high-load applications, significantly extending service life compared to conventional plastics.

The patent applies parameter changes by optimizing the thread geometry parameters (such as flank angles, root radii, and pitch) to achieve a balance between load capacity and manufacturability. The design incorporates rounded thread roots and optimized engagement surfaces that distribute stresses more evenly, reducing sensitivity to manufacturing tolerances while maintaining high load capacity.