Plastic-Coated Threaded Adjustment Assembly for Quiet Crash Resistance

The patent applies composite materials by combining plastic and metal in a single adjustment part. The adjustment part has a plastic base material that provides noise reduction, with integrated metal reinforcement elements (such as metal inserts or metal-coated regions) that provide crash resistance. This composite structure allows the part to exhibit both low noise characteristics during normal operation and high strength during crash events, resolving the contradiction between noise reduction and crash resistance.

The patent applies local quality by providing different material properties in different regions of the adjustment part. The majority of the adjustment part is made of plastic for noise reduction, while specific local regions (such as load-bearing surfaces, thread regions, or impact zones) are reinforced with metal or metal coating. This localized metal reinforcement provides crash resistance only where needed, while the plastic portions maintain low noise operation, thus resolving the contradiction between crash resistance and noise.

The patent applies the nesting principle by integrating metal reinforcement elements within the plastic adjustment part in a space-efficient manner. Instead of arranging metal and plastic components axially next to each other (which would increase length), the metal elements are nested within or embedded in the plastic structure. For example, metal inserts are placed inside the plastic nut body, or metal coating is applied on the inner surface, allowing the reinforcement to occupy the same spatial envelope as the plastic component, thus reducing installation space while maintaining crash resistance.

The patent applies the merging principle by combining the plastic and metal components into a single integrated adjustment part rather than using separate alternating threads. The metal reinforcement elements are directly formed into or embedded in the plastic component during the molding process, creating a unified part that eliminates the need for separate manufacturing and assembly of alternating steel and plastic threads. This integration reduces manufacturing complexity while maintaining the noise reduction benefits of plastic contact surfaces.