Telescopic Steering Shaft Stop Coating for Noise Damping

A non-metallic layer (such as plastic or polymer coating) is applied to the stop surfaces of the metallic shafts. This intermediary layer acts as a mediator between the two metallic stop surfaces, preventing direct metal-to-metal contact during telescopic adjustment. The non-metallic material absorbs impact energy through deformation, thereby eliminating the noisy metallic impact sound while maintaining the stopping function. The layer is designed to be thin enough not to compromise the structural strength but thick enough to provide effective cushioning.

The physical and mechanical parameters of the stop surfaces are changed by coating them with non-metallic material. The metallic surfaces are transformed into composite surfaces (metal substrate + non-metallic coating) with different impact characteristics. The non-metallic layer has lower elasticity and higher damping properties compared to metal, which fundamentally changes the impact behavior from hard metallic collision to softer, quieter deformation absorption.

The non-metallic layer is applied to the stop surfaces during the manufacturing process, specifically during the telescopic shaft assembly production. By performing the coating operation preliminarily (before final assembly), the noise-reducing feature is built into the component itself, eliminating the need for additional noise control measures during vehicle assembly or operation. This preliminary action integrates the noise reduction function into the base manufacturing process.

The solution uses composite material construction by combining metallic shaft material with non-metallic coating material. The metallic core provides structural strength and telescopic function, while the non-metallic outer layer provides noise reduction and haptic improvement. This composite approach allows each material to perform its optimal function, achieving multiple objectives simultaneously without significantly complicating the manufacturing process.