Shift Fork Pad Multilayer Coating Abrasion Resistance

The invention applies a composite coating structure consisting of alternating molybdenum (Mo) and copper (Cu) layers on the shift fork pad. The Mo layers provide high hardness and abrasion resistance, while the Cu layers provide low friction characteristics. This composite structure resolves the contradiction by combining materials with complementary properties, achieving both high abrasion resistance and low friction coefficient simultaneously, rather than using a single material that can only optimize for one property.

The invention applies local quality by providing abrasion resistance only where needed - specifically on the pad surface that contacts the sleeve during gear shifting. Instead of manufacturing the entire shift fork from expensive hypereutectic aluminum alloy, the patent uses a standard aluminum alloy base material and applies a specialized Mo-Cu coating only to the pad surface. This resolves the contradiction by concentrating the high-performance material where it is most needed, reducing overall material costs while maintaining necessary abrasion resistance.

The invention segments the coating into multiple alternating layers of molybdenum and copper, with each layer having specific thicknesses (Mo: 10-20 μm, Cu: 5-10 μm). This segmented multilayer structure prevents surface peeling by creating a layered architecture where each material supports the others, while the alternating hard/soft layers distribute stress more effectively than a single layer. The segmentation principle resolves the contradiction by using a multi-layer structure that achieves superior abrasion resistance without requiring excessive coating thickness or complex single-layer materials.